דלג לתוכן (מקש קיצור 's')
Logo of Technion
Logo of CS Department
אירועים

אירועים והרצאות בפקולטה למדעי המחשב ע"ש הנרי ומרילין טאוב

CGGC Seminar: Hierarchical Volumetric Modeling as a Base for Multiscale Physical Based Analysis and Design of Porous Structures
event speaker icon
לב פודשיבלוב (מארי קירי, פריס)
event date icon
יום ראשון, 30.12.2012, 13:00
event location icon
חדר 337, בניין טאוב למדעי המחשב
Hierarchical modeling is often applied in fields such as computer vision, computer graphics, computer-aided geometric design, cartography and virtual reality. The importance of this approach has increased in recent years due to the ability to create models with more details. Hierarchical modeling is useful in order to make storage, transmission, computation, and visualization of these models possible and more efficient. The most prevalent 3D hierarchical geometric data structure is the Octree. In this research, the ...
[לנוסח המלא]
Theory Seminar: Distributed Computing Meets Biology: Towards a New Scientific Framework
event speaker icon
עמוס קורמן (אונ' פריס דידרו)
event date icon
יום רביעי, 26.12.2012, 12:30
event location icon
טאוב 201
In recent years, several works have demonstrated how the study of biology can benefit from an algorithmic perspective. In this talk I discuss a new approach for such a methodology based on combining theoretical tradeoff techniques with field experiments to obtain bounds on biological parameters. A proof of concept for this framework is provided by considering central search foraging strategies of desert ants, and obtaining theoretical tradeoffs between the search time and the memory complexity ...
[לנוסח המלא]
TCE Guest Lecture: Energy-Aware Scheduling for Heterogeneous Multi-Core Architectures
event speaker icon
פרופ' דניאל מוסה (אונ' פיטסבורג)
event date icon
יום רביעי, 26.12.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
The current trend to move from homogeneous to heterogeneous multi-core (HetCMP) systems promises further performance and energy-efficiency benefits. A typical HetCMP system includes two distinct types of cores, such as high performance sophisticated ("large") cores and simple low-power ("small") cores. In those heterogeneous platforms, execution phases of application threads that are CPU-intensive can take best advantage of large cores, whereas I/O or memory intensive execution phases are best suited and assigned to small cores. However, ...
[לנוסח המלא]
Pixel Club: From the invention of Compressive Sensing to Recent Results
event speaker icon
יורם ברסלר (אונ' אילינוי)
event date icon
יום שלישי, 25.12.2012, 13:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Compressive sensing (CS), also known as compressive sampling, has become widely popular in recent years. In the first part of the talk, we review the little known fact, that the invention of CS preceded the papers that popularized it by almost a decade. Spectrum-blind sampling (SBS), proposed by Bresler and Feng in the mid-90’s, and further developed into “image compression on the fly,” with Venkataramani, and Gastpar, is the first known compressed sensing technique. This ...
[לנוסח המלא]
Pixel Club: Sparse Matrix Models for Finding Good Data Representatives and Constraining the Topology of Networks
event speaker icon
גווילרמו ספירו (אונ' מינסוטה)
event date icon
יום שלישי, 25.12.2012, 11:30
event location icon
חדר 1003, בניין מאייר, הפקולטה להנדסת חשמל
We consider the problem of finding a few representatives for a dataset, i.e., a subset of data points that efficiently describes the entire dataset. We assume that each data point can be expressed as a linear combination of the representatives and formulate the problem of finding the representatives as a sparse multiple measurement vector problem. In our formulation, both the dictionary and the measurements are given by the data matrix, and the unknown sparse codes ...
[לנוסח המלא]
Haifux Club: Learning from the Open Source Production Process
event speaker icon
יעל ויה-טלמור (אונ' בר-אילן)
event date icon
יום שני, 24.12.2012, 18:30
event location icon
טאוב 6
The open source production process is fascinating in many respects: it produces high quality code outside the boundaries of the hierarchical organization, it defies the rules of many traditional software production models and it has many profound implications on social, political, and economic systems of the Internet era. I will discuss prior research work on the topic. For example, should open source serve as an example of how to develop systems of participation with the ...
[לנוסח המלא]
Exploring Human Evolution and Deciphering the Human Genome Using Complete Individual Genome Sequences
event speaker icon
Ilan Gronau
event date icon
יום שני, 24.12.2012, 14:30
event location icon
חדר 337-8 טאוב.
Generating Map-based Routes from GPS Trajectories and their Compact Representation
event speaker icon
רנית גוטסמן
event date icon
יום רביעי, 19.12.2012, 13:00
event location icon
טאוב 601
Digital maps and devices with an integrated GPS receiver, such as smartphones, are now an integral part of our lives. We deal with two practical problems related to GPS trajectories and digital maps. The first problem is the classical problem of map-matching; namely, matching a given GPS trajectory, possibly noisy or sparse, to the sequence of actual roads traversed by the carrier of the GPS receiver. We provide a novel solution to this problem. Our ...
[לנוסח המלא]
Theory Seminar: New Applications of Communication Complexity in Distributed Computing
event speaker icon
רותם אושמן (אונ' טורונטו)
event date icon
יום רביעי, 19.12.2012, 12:45
event location icon
טאוב 201
The advent of large-scale wireless networks has presented the distributed computing community with a new challenge: wireless networks are much more disorderly than traditional wired networks, and they are difficult to model and predict. In addition, they are subject to different design considerations: among other criteria, it is crucial to conserve power by reducing the amount of communication between network nodes. This communication constraint leads to interesting connections between distributed computing and communication complexity. In ...
[לנוסח המלא]
ceClub: Predicting Execution Bottlenecks in Map-Reduce Clusters
event speaker icon
אדוארד בורטניקוב (יאהו! ישראל)
event date icon
יום רביעי, 19.12.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Extremely slow, or straggler, tasks are a major performance bottleneck in map-reduce systems. Hadoop infrastructure makes an effort to both avoid them (through minimizing remote data accesses) and handle them in the runtime (through speculative execution). However, the mechanisms in place neither guarantee the avoidance of performance hotspots in task scheduling, nor provide any easy way to tune the timely detection of stragglers. We suggest a machine-learning approach to address these problems, and introduce a ...
[לנוסח המלא]
Operating system support for high-throughput processors
event speaker icon
Mark Silberstein
event date icon
יום שלישי, 18.12.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Hybrid Classifiers for Object Classification with a Rich Background
event speaker icon
מרגריטה אוסדצ'י (אונ' חיפה)
event date icon
יום שלישי, 18.12.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
The majority of current methods in object classification use the one-against-res​t training scheme. We argue that when applied to a large number of classes, this strategy is problematic: as the number of classes increases, the negative class becomes a very large and complicated collection of images. The resulting classification problem then becomes extremely unbalanced, and kernel SVM classifiers trained on such sets require long training time and are slow in prediction. To address these problems, ...
[לנוסח המלא]
TCE Guest Lecture: Multimodal First-Person Perception
event speaker icon
דנבר דאש (אינטל)
event date icon
יום חמישי, 13.12.2012, 13:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
For decades, our culture has been fascinated with the concept of the “Star Trek computer”. An all-knowing entity which is available to query about almost anything relevant to the world around us, organize our daily lives, remind us when we are doing the wrong thing, help us when we are lost. Several key features of this type of system are: (1) We can interact with it via natural language and it will understand our words ...
[לנוסח המלא]
Fair is Fair: A Protocol and an Algorithm for Unbiased Evaluation of Linguistic Structure Prediction.
event speaker icon
Reut Tsarfaty
event date icon
יום רביעי, 12.12.2012, 14:30
event location icon
חדר 337-8 טאוב.
Learning patterns in Big data from small data using core-sets
event speaker icon
Dan Feldman
event date icon
יום שלישי, 11.12.2012, 14:30
event location icon
חדר 337-8 טאוב.
TCE Guest Lecture: Unconventional Fault-tolerant Accelerators
event speaker icon
פרופ' אוליבייה טמאם, INRIA
event date icon
יום חמישי, 6.12.2012, 12:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Due to the evolution of technology constraints, especially energy constraints which may lead to heterogeneous multicores, and the increasing number of transient faults and permanent defects, the design of defect-tolerant accelerators for heterogeneous multi-cores may become a major micro-architecture research issue. Most custom circuits are highly defect sensitive, a single transistor can wreck such circuits. On the contrary, neural networks (NNs) are inherently error-tolerant algorithms. And the emergence of high-performance applications implementing recognition, mining and ...
[לנוסח המלא]
Syntactic Annotation of Hebrew CHILDES Corpora
event speaker icon
אבישי גרץ
event date icon
יום רביעי, 5.12.2012, 12:30
event location icon
טאוב 601
The CHILDES database is a large collection of child---adult spoken interactions in over 25 languages. Automatic annotation of these data faciliates research on child language development and acquisition by providing researchers with a large amount of accurate data. Recently, the English section of the CHILDES database was automatically annotated with labeled dependency relations in a state-of-the-art approach. We describe a similar endeavor, focusing on the Hebrew section of CHILDES. This is done by the following ...
[לנוסח המלא]
Theory Seminar: Sealed Bid Combinatorial Auctions
event speaker icon
שחר דובזינסקי (מכון ויצמון למדעי)
event date icon
יום רביעי, 5.12.2012, 12:30
event location icon
טאוב 201
We generalize sealed bid auctions to accommodate combinatorial auctions. In a sealed bid combinatorial auction each bidder sends to the auctioneer, simultaneously with the others, a message that depends only on his own valuation. The auctioneer decides on the allocation based on these messages alone. The goal is to find an allocation of the items which maximizes the social welfare. In this simultaneous communication complexity model we ask: How much information each of the bidders ...
[לנוסח המלא]
CGGC Seminar: Computing Extremal Quasiconformal Maps
event speaker icon
אופיר ובר (אונ' חיפה)
event date icon
יום רביעי, 5.12.2012, 11:30
event location icon
טאוב 401
Conformal maps are widely used in geometry processing applications. They are smooth, preserve angles, and are locally injective by construction. However, conformal maps do not allow for boundary positions to be prescribed. A natural extension to the space of conformal maps is the richer space of quasiconformal maps of bounded conformal distortion. Extremal quasiconformal maps, that is, maps minimizing the maximal conformal distortion, have a number of appealing properties making them a suitable candidate for ...
[לנוסח המלא]
Pixel Club: Photo Sequencing
event speaker icon
יעל מוזס (בינתחומי, הרצליה)
event date icon
יום שלישי, 4.12.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Dynamic events such as family gatherings, concerts or sports events are often captured by a group of people. The set of still images obtained this way is rich in dynamic content but lacks accurate temporal information. We propose a method for *photo-sequenci​ng* -- temporally ordering a set of still images taken asynchronously by a set of uncalibrated cameras. Photo-sequencin​g is an essential tool in analyzing (or visualizing) a dynamic scene captured by still images. We ...
[לנוסח המלא]
Haifux Club: The Device Tree: Plug and play for Embedded Linux
event speaker icon
עלי בילאר
event date icon
יום שני, 3.12.2012, 18:30
event location icon
טאוב 6
On embedded systems, the Linux kernel doesn't have the BIOS to tell it what the hardware is like. On the other hand, the traditional solution of having the hardware information hardcoded in the kernel source is leading to an overpopulation of platform-specific hacks (read: a disaster).
[לנוסח המלא]
TCE Guest Lecture: How Alan Turing Cracked the Enigma Code
event speaker icon
פרופ' ימיר ויגפוסון (אונ' רקייאויק)
event date icon
יום שני, 3.12.2012, 13:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Code breakers played an enormously crucial role in World War II. Alan Turing, the father of computer science, was at the center of allied code breaking operations and his breakthroughs made intelligence gathering not only possible but practical. This general audience talk, celebrating Alan Turing's Centenary, explains the notorious German Enigma code and how it was systematically cracked by the Allies. Bio Ymir Vigfusson is an Assistant Professor at the School of Computer Science at ...
[לנוסח המלא]
CGGC Seminar: Accelerating Geometric Operations on Freeform Models
event speaker icon
קים יונג ג'ון (מדעי המחשב, טכניון)
event date icon
יום ראשון, 2.12.2012, 13:00
event location icon
חדר 337, בניין טאוב למדעי המחשב
NURBS is one of the typical way of representing geometric data and have been widely used in many areas such as computer graphics, CAGD, robotics. NURBS represents geometric data based on the mathematical form, and thus it requires relatively small memory space compared to the other representations. Compactness of geometric data is crucial in recent computing environments (Network, Mobile, Multi-Core) and NURBS is good candidate to be a geometric representation in such environments. However, at ...
[לנוסח המלא]
Bioinformatics Forum: Fragment-Based Design of RNA sequences and Detection of RNA switches
event speaker icon
דני ברש (אונ' בן-גוריון)
event date icon
יום חמישי, 29.11.2012, 13:30
event location icon
טאוב 701
The inverse RNA folding problem for designing sequences that fold into a given RNA secondary structure was introduced in the early 1990's in Vienna. Using a coarse-grain tree graph representation of the RNA secondary structure, we extended the inverse RNA folding problem to include constraints such as thermodynamic stability and mutational robustness, deveoping a program called RNAexinv. Furthermore, we propose a fragment-based design approach of RNA sequences that can be useful to practitioners in a ...
[לנוסח המלא]
Theory Seminar: Partially Symmetric Functions are Efficiently Isomorphism-Testable
event speaker icon
עמית וינשטיין (אונ' תל-אביב)
event date icon
יום רביעי, 28.11.2012, 12:30
event location icon
טאוב 201
Given a function f: {0,1}^n \to {0,1}, the f-isomorphism testing problem requires a randomized algorithm to distinguish functions that are identical to f up to relabeling of the input variables from functions that are far from being so. An important open question in property testing is to determine for which functions f we can test f-isomorphism with a constant number of queries. Despite much recent attention to this question, essentially only two classes of functions ...
[לנוסח המלא]
ceClub: Optimal Rebuilding in Distributed Storage Systems
event speaker icon
זינג וואנגת, CALTECH
event date icon
יום רביעי, 28.11.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Distributed storage systems have become a popular solution to large file storage and fast data access. In such systems, erasure-correcting codes are widely used to combat disk failures, where disks correspond to symbols in the code. Specifically, we study MDS (maximum distance separable) array codes which enable optimal storage and efficient encoding and decoding algorithms. With r redundancy symbols an MDS code can sustain r erasures. For example, consider an MDS code that can correct ...
[לנוסח המלא]
Pixel Club: Extracting Foreground Masks towards Object Recognition
event speaker icon
אמיר רוזנפלד (מכון ויצמן למדע)
event date icon
יום שלישי, 27.11.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Effective segmentation prior to recognition has been shown to improve recognition performance. However, most segmentation algorithms adopt methods which are not explicitly linked to the goal of object recognition. Here we solve a related but slightly different problem in order to assist object recognition more directly - the extraction of a foreground ask, which identifies the locations of objects in the image. We propose a novel foreground/background segmentation algorithm that attempts to segment the interesting ...
[לנוסח המלא]
TCE Guest Lecture: Faults: a Foe or Friend?
event speaker icon
פרופ' יאנוס סאציאדס (אונ' קפריסין)
event date icon
יום שלישי, 27.11.2012, 10:00
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
The traditional performance-cost benefits enjoyed for decades from scaling of device area are challenged by the slowdown of voltage scaling and less reliable silicon primitives. These developments lead to pessimistic projections that it will be impossible to operate all on-chip resources, even at the minimum voltage for safe operation, due to power constraints, and the growing design and operational margins, used to provide silicon primitives with resiliency against variations, will consume the scaling benefits. Our ...
[לנוסח המלא]
Fractional Secret Sharing and Lossy Chains
event speaker icon
עומר סטרולוביץ
event date icon
יום רביעי, 21.11.2012, 15:30
event location icon
טאוב 601
A rich man has many children. Unfortunately, over the years they have grew apart and started to hate each other. The rich man seeks to give his inheritance to the largest group of his children that can cooperate. How can he do it? To answer this, we introduce and study the related notions of lossy chains and fractional secret sharing. Both of these concepts are motivated by goal of controlling the amount of work required ...
[לנוסח המלא]
Joint Scheduling in Wireless Networks
event speaker icon
גיא גרבלה
event date icon
יום רביעי, 21.11.2012, 14:00
event location icon
טאוב 601
A crucial step in the evolution of broadband wireless (cellular) networks is reducing the size of the cells and increasing their number. This target is usually obtained using cell sectorization, where the omni-directional antenna at each base station (BS) is replaced by 3 or 6 directional antennas. With respect to this evolution, the contribution of our work is two-fold. First, we propose a new protocol stack for a BS that governs multiple directional antennas. In ...
[לנוסח המלא]
Theory Seminar: From the Impossibility of Obfuscation to a New Non-Black-Box Technique
event speaker icon
ניר ביטנסקי (אונ' ת"א)
event date icon
יום רביעי, 21.11.2012, 12:30
event location icon
טאוב 201
The introduction of a non-black-box simulation technique by Barak (FOCS 2001) has been a major landmark in cryptography, breaking the previous barriers of black-box impossibility. Barak’s techniques were subsequently extended and have given rise to various powerful applications. We present the first non-black-box simulation technique that does not rely on Barak’s technique. Our technique is based on essentially different tools: it does not invoke universal arguments, nor does it rely on collision-resistant hashing. Instead, the ...
[לנוסח המלא]
ceClub: CBTree: A Practical Concurrent Self-Adjusting Search Tree
event speaker icon
אדם מוריסון (אונ' ת"א)
event date icon
יום רביעי, 21.11.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
We present the CBTree, a new counting-based self-adjusting sequential search tree that, like splay trees, moves more frequently accessed nodes closer to the root: After M operations on N items, Q of which access some item V, an operation on V traverses a path of length O(log M/Q) while performing few if any rotations. In contrast to the traditional self-adjusting splay tree in which each accessed item is moved to the root through a sequence ...
[לנוסח המלא]
Querying Web Applications Under Terms of Uncertainty
event speaker icon
Daniel Deutch
event date icon
יום שלישי, 20.11.2012, 14:30
event location icon
חדר 337-8 טאוב.
Geometric Covering
event speaker icon
נדב שרגאי
event date icon
יום ראשון, 18.11.2012, 13:00
event location icon
טאוב 337
Covering questions emerges in many disciplines and are closely related to the well known set-cover problem in computer science. Similarly, geometric covering is of great importance and yet has only been investigated in seemingly unrelated specific disciplines. Examples include the well known art-gallery problem, mold-design problems, inspection, security and surveillance problems. In this thesis, we present a single unified framework that can solve many of the above geometric covering queries. The suggested framework reduces a ...
[לנוסח המלא]
Large Scale Semi-Supervised Sentiment Analysis
event speaker icon
יואב חיימוביץ
event date icon
יום רביעי, 14.11.2012, 12:30
event location icon
טאוב 601
We describe a bootstrapping algorithm able to learn from partially labeled data. We report the results of an empirical study for using this algorithm to improve performance of sentiment classification using up to 15 million unlabeled Amazon product reviews. Our experiments cover semi-supervised learning, domain adaptation and weakly supervised learning. In some cases our methods were able to reduce test error by more than half using such large amounts of data, and in all cases ...
[לנוסח המלא]
Theory Seminar: Predecessor Queries on Dynamic Subsets of an Ordered List, with Applications
event speaker icon
צבי קופלוביץ (מכון ויצמן למדע)
event date icon
יום רביעי, 14.11.2012, 12:30
event location icon
טאוב 201
In the famous order maintenance problem, one wishes to maintain a dynamic list L of size n under insertions, deletions, and order queries. In an order query, one is given two nodes from L and must determine which node precedes the other in L. In an extension to this problem, named the Predecessor search on Dynamic Subsets of an Ordered Dynamic List problem (POLP for short), it is also necessary to maintain dynamic subsets S_1... ...
[לנוסח המלא]
Backward causality in temporal Talmudic logic
event speaker icon
Dov Gabbay
event date icon
יום שלישי, 13.11.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Non-Rigid Shape Correspondence Using Sparsity
event speaker icon
מיכאל ברונשטיין (אונ' לוגנו)
event date icon
יום שלישי, 13.11.2012, 11:30
event location icon
חדר 1003, בניין מאייר, הפקולטה להנדסת חשמל
Finding dense intrinsic correspondence between non-rigid shapes is a notoriously difficult problem with many important applications in computer graphics and pattern recognition. In the first part of the talk, I will present a novel sparse modeling approach to non-rigid shape matching using only the ability to detect repeatable regions. As the input to our algorithm, we are given only two sets of regions in two shapes; no descriptors are provided so the correspondence between the ...
[לנוסח המלא]
Fast Parallel Matrix Multiplication
event speaker icon
Oded Schwartz
event date icon
יום ראשון, 11.11.2012, 14:30
event location icon
חדר 337-8 טאוב.
On the Role of Color Information in Texture Recognition
event speaker icon
מיכה כלפון
event date icon
יום ראשון, 11.11.2012, 11:30
event location icon
טאוב 601
Texture features have always been a key attribute in image recognition and classification. In this work we propose a pre-processing stage for enhancing the performance of widely used color texture recognition methods. One approach we investigated, Decorrelation Stretching, was employed historically for enhancing the interpretability of multi-channel satellite images. This is achieved by stretching the dynamic range of color data over its principal components. Another approach decomposes the image into cartoon-like and texture components and ...
[לנוסח המלא]
Taming Logics: Theory, Tools, Applications
event speaker icon
Anna Zamansky
event date icon
יום רביעי, 7.11.2012, 14:30
event location icon
חדר 337-8 טאוב.
Asymptotic and Numerical Solution for Electrokinetic Flow Around a Spherical Particle
event speaker icon
רומן זיידה
event date icon
יום רביעי, 7.11.2012, 12:30
event location icon
טאוב 601
A numerical framework for the simulation of electrokinetic migration of particles in an electrolyte solution due to the application of an external electric field is presented. The electrokinetic transport process is described by a system of nonlinear partial differential equations (PDE). A thin boundary layer forms around the particle due to strong electrostatic forces. The resulting scale disparity of the boundary layer is used to derive nonlinear effective boundary conditions for the numerical solver using ...
[לנוסח המלא]
Theory Seminar: On Sunflowers and Matrix Multiplication
event speaker icon
ליאוניד ברנבוים (אונ' בן-גוריון)
event date icon
יום רביעי, 7.11.2012, 12:30
event location icon
טאוב 201
In a distributed message passing model a communication network is represented by an n-vertex graph whose vertices host processors, and edges serve as communication links. One of the most fundamental goals in this setting is breaking the symmetry in the network. Specifically, the tasks of computing vertex coloring, maximal matching, and maximal independent set are of great importance. In the mid-eighties several randomized distributed algorithms for these problems were devised. [Luby 86, Alon, Babai and ...
[לנוסח המלא]
ceClub: The Future of the Telecommunication Industry: The New Horizon of Virtual Telecommunication and Carrier Clouds
event speaker icon
דוד אמזלג. Alcatel-Lucent
event date icon
יום רביעי, 7.11.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Wireless networks are the most important assets in our industry, yet the problem is that we are building new networks the same way we built our previous networks. Capacity is planned in advance per service; to handle peek traffic and to add new capacity takes time and investment of dedicated equipment. We have no elasticity as demand grows, on average the service is grossly underutilized though also over utilized at specific times of day or ...
[לנוסח המלא]
SSDL Seminar: On Incomplete Bug Fixes in Eclipse and Programmers Intuition on These
event speaker icon
סביח אגבאריה (מדעי המחשב)
event date icon
יום שלישי, 6.11.2012, 12:30
event location icon
טאוב 235
Recent studies indicate that multiple patches to software are found in a hefty portion of resolved bugs. It is also known that bugs that require multiple patches take longer to resolve, that their severity tends to be higher than the average and that they induce programmers to engage more in bug discussions. This work is concerned with the ability of programmers to predict a bug will be of this sort, and in particular that it ...
[לנוסח המלא]
TCE Guest Lecture: Optimized Networked Systems
event speaker icon
פרופ' ימיר ויגפוסון (אונ' רקייאויק)
event date icon
יום שני, 5.11.2012, 13:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Optimal use of computing resources is pivotal to minimize expenditures and improve competitiveness of companies. The computing technologies are continuously evolving and the users are adapting at a unparalleled pace, thus producing intriguing research questions. In the first half of the talk, we observe that Internet service providers (ISPs) face surging Internet loads associated with real-time streaming video and various forms of dynamically generated, short-lived content. We propose a new system called GRADIENT aimed at ...
[לנוסח המלא]
Pixel Club: Computational Reconstruction of Zebra-Fish Early Embryogenesis by Nonlinear Pde Methods of Image Processing
event speaker icon
פרופ' קרול מיקולה (אונ' ברטיסלבה, סלובקיה)
event date icon
יום חמישי, 1.11.2012, 12:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
In the talk we present mathematical models and numerical methods which lead to early embryogenesis reconstruction and extraction of the cell lineage tree from the large-scale 4D image sequences. Robust and efficient finite volume schemes for solving nonlinear PDEs related to filtering, object detection and segmentation of 3D images were designed to that goal and studied mathematically. They were parallelized for massively parallel computer clusters and applied to the mentioned problems in developmental biology. The ...
[לנוסח המלא]
Theory Seminar: Constructive Discrepancy Minimization by Walking on The Wedges
event speaker icon
שחר לווט (אונ' פרינסטון)
event date icon
יום רביעי, 31.10.2012, 12:30
event location icon
טאוב 201
Minimizing the discrepancy of a set system is a fundamental problem in combinatorics. One of the cornerstones in this area is the celebrated six standard deviations result of Spencer (AMS 1985): In any system of $n$ sets in a universe of size $n$, there always exists a coloring which achieves discrepancy $6\sqrt{n}$. The original proof of Spencer was existential in nature, and did not give an efficient algorithm to find such a coloring. Recently, a ...
[לנוסח המלא]
TOWARDS A PROOF THEORY OF ANALOGICAL REASONING
event speaker icon
Matthias Baaz
event date icon
יום שלישי, 30.10.2012, 14:30
event location icon
חדר 337-8 טאוב.
ceClub: Self-Optimizing Microprocessors: A Machine Learning Approach
event speaker icon
חוזה פ. מרטינז (אונ' קורנל)
event date icon
יום שלישי, 30.10.2012, 13:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
As each technology generation brings additional transistors, the computer industry hopes to convert these into performance growth by stamping out a greater number of cores on a die. On the one hand, in many environments, that seems like a lot of hope. On the other hand, architecture researchers have grown almost allergic to "complex" alternatives, which history has shown can quickly fall off the cliff of diminishing returns. A fundamental hurdle to bettering architectures may ...
[לנוסח המלא]
TCE Guest Lecture: Self-Optimizing Microprocessors: A Machine Learning Approach
event speaker icon
חוזה פ. מרטינז (אונ' קורנל)
event date icon
יום שלישי, 30.10.2012, 13:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
As each technology generation brings additional transistors, the computer industry hopes to convert these into performance growth by stamping out a greater number of cores on a die. On the one hand, in many environments, that seems like a lot of hope. On the other hand, architecture researchers have grown almost allergic to "complex" alternatives, which history has shown can quickly fall off the cliff of diminishing returns. A fundamental hurdle to bettering architectures may ...
[לנוסח המלא]
Haifux Club: Israeli Digital Rights NPO
event speaker icon
צבי דביר, digitalrights.org.il
event date icon
יום שני, 29.10.2012, 18:30
event location icon
טאוב 6
The Digital Rights Movement stands between advanced technology and people rights (in the broad sense). Technological advance provides us with new products and new means of interacting with our surrounding. It provides a customer more flexibility and new ways of using a given product. However, it can be used to control and limit the usability of the product. For example, a customer buys a product, a certain book. Does it matters if the product is ...
[לנוסח המלא]
Theory Seminar: On Sunflowers and Matrix Multiplication
event speaker icon
אמיר שפילקה (מדעי המחשב)
event date icon
יום רביעי, 24.10.2012, 12:30
event location icon
טאוב 201
We present several variants of the sunflower conjecture of Erdos and Rado and discuss the relations among them. We then show that two of these conjectures (if true) imply negative answers to questions of Coppersmith and Winograd and of Cohn et al regarding possible approaches for obtaining fast matrix multiplication algorithms. Specifically, we show that the Erdos-Rado sunflower conjecture (if true) implies a negative answer to the ``no three disjoint equivoluminous subsets'' question of Coppersmith ...
[לנוסח המלא]
SSDL Seminar: Speculative Separation for Privatization and Reductions
event speaker icon
איל זקס (אינטל)
event date icon
יום שלישי, 23.10.2012, 12:30
event location icon
טאוב 235
Automatic parallelization is a promising strategy to improve application performance in the multicore era. However, common programming practices such as the reuse of data structures introduce artificial constraints that obstruct automatic parallelization. Privatization relieves these constraints by replicating data structures, thus enabling scalable parallelization. Prior privatization schemes are limited to arrays and scalar variables because they are sensitive to the layout of dynamic data structures. This work presents Privateer, the first fully automatic privatization system ...
[לנוסח המלא]
Theory Seminar: Statistical Algorithms and a Lower Bound for Planted Clique
event speaker icon
ויטלי פלדמן, IBM
event date icon
יום רביעי, 17.10.2012, 12:30
event location icon
טאוב 201
We develop a framework for proving lower bounds on computational problems over distributions, including optimization and unsupervised learning. Our framework is based on defining a restricted class of algorithms, called statistical algorithms, that instead of accessing samples from the input distribution can only obtain an estimate of the expectation of any given function on a sample drawn randomly from the input distribution. Our definition captures many natural algorithms used in theory and practice, e.g. moments-based ...
[לנוסח המלא]
Haifux Club: Adding Colors To Kademlia
event speaker icon
גיל אינציגר (מדעי המחשב, טכניון)
event date icon
יום שני, 15.10.2012, 18:30
event location icon
טאוב 6
Kademlia is considered to be one of the most effective key based routing protocols. It is nowadays implemented in many file sharing peer-to-peer networks such as BitTorrent, KAD, and Gnutella. Kaleidoscope , a novel routing/caching scheme designed to significantly reduce the cost of Kademlia lookup operations Kaleidoscope also improves the anonymity of nodes in the system.
[לנוסח המלא]
Learning to Predict the Future using Web Knowledge and Dynamics
event speaker icon
קירה רדינסקי
event date icon
יום שלישי, 9.10.2012, 16:30
event location icon
טאוב 601
Mark Twain famously said that ``the past does not repeat itself, but it rhymes.'' In the spirit of this reflection, we present novel algorithms and methods for leveraging large-scale digital histories and human knowledge mined from the Web to make real-time predictions about the likelihoods of future human and natural events of interest. The Web is a dynamic being, with constantly updating content, which is entangled with sophisticated user behaviors and interactions. Some of these ...
[לנוסח המלא]
Learning to Predict the Future using Web Knowledge and Dynamics
event speaker icon
קירה רדינסקי
event date icon
יום שלישי, 9.10.2012, 16:30
event location icon
טאוב 601
Mark Twain famously said that ``the past does not repeat itself, but it rhymes.'' In the spirit of this reflection, we present novel algorithms and methods for leveraging large-scale digital histories and human knowledge mined from the Web to make real-time predictions about the likelihoods of future human and natural events of interest. The Web is a dynamic being, with constantly updating content, which is entangled with sophisticated user behaviors and interactions. Some of these ...
[לנוסח המלא]
Learning to Predict the Future using Web Knowledge and Dynamics
event speaker icon
קירה רדינסקי
event date icon
יום שלישי, 9.10.2012, 16:30
event location icon
טאוב 601
Mark Twain famously said that ``the past does not repeat itself, but it rhymes.'' In the spirit of this reflection, we present novel algorithms and methods for leveraging large-scale digital histories and human knowledge mined from the Web to make real-time predictions about the likelihoods of future human and natural events of interest. The Web is a dynamic being, with constantly updating content, which is entangled with sophisticated user behaviors and interactions. Some of these ...
[לנוסח המלא]
Learning to Predict the Future using Web Knowledge and Dynamics
event speaker icon
קירה רדינסקי
event date icon
יום שלישי, 9.10.2012, 16:30
event location icon
טאוב 601
Mark Twain famously said that ``the past does not repeat itself, but it rhymes.'' In the spirit of this reflection, we present novel algorithms and methods for leveraging large-scale digital histories and human knowledge mined from the Web to make real-time predictions about the likelihoods of future human and natural events of interest. The Web is a dynamic being, with constantly updating content, which is entangled with sophisticated user behaviors and interactions. Some of these ...
[לנוסח המלא]
Learning to Predict the Future using Web Knowledge and Dynamics
event speaker icon
קירה רדינסקי
event date icon
יום שלישי, 9.10.2012, 16:30
event location icon
טאוב 601
Mark Twain famously said that ``the past does not repeat itself, but it rhymes.'' In the spirit of this reflection, we present novel algorithms and methods for leveraging large-scale digital histories and human knowledge mined from the Web to make real-time predictions about the likelihoods of future human and natural events of interest. The Web is a dynamic being, with constantly updating content, which is entangled with sophisticated user behaviors and interactions. Some of these ...
[לנוסח המלא]
The Use of Overloading in Java Programs
event speaker icon
קרן לנץ
event date icon
יום רביעי, 19.9.2012, 13:00
event location icon
חדר 337, בניין טאוב למדעי המחשב
Method overloading is a controversial language feature, especially in the context of Object Oriented languages, where its interaction with overriding may lead to confusing semantics. One of the main arguments against overloading is that it can be abused by assigning the same identity to conceptually different methods. This talk describes a study of the actual use of overloading in Java. To this end, we developed a taxonomy of classification of the use of overloading, and ...
[לנוסח המלא]
Pixel Club: The Noise Clinic
event speaker icon
ז'אן מישל מורל (CMLA, צרפת)
event date icon
יום רביעי, 19.9.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
All images have noise, but this noise may have undergone many distortions. Can we take any image, say, an olde photograph, and denoise it? This requires a good denoising method and an accurate noise estimator, both working for "any" image and "any" noise. I'll discuss both aspects, and particularly how to estimate a signal-dependen​t and scale-dependent noise. A prototype of the noise clinic is currently on line at http://dev.ipol​.im/~colom/ipol​_demo/noise_cli​nic/ (username : demo, password: demo). This ...
[לנוסח המלא]
Parameterizing P: Proximity to Easy Variants
event speaker icon
דוד וייץ
event date icon
יום רביעי, 12.9.2012, 14:00
event location icon
טאוב 201
The field of Parameterized Complexity strives to solve intractable problems efficiently, via multivariate analysis of running time, as a function of both the input size n and a parameter k. Such analysis enables to show that some of these problems are \emph{fixed parameter tractable} (FPT); in other words, they can be solved in time f(k)* n^O(1). The rationale behind this approach is the observation that many real-life inputs have small parameter values. In this work ...
[לנוסח המלא]
Mathematical Analysis of Emergent Behavior in Multi-Agent Systems
event speaker icon
יותם אלאור
event date icon
יום שני, 10.9.2012, 14:30
event location icon
טאוב 401
Emergence can be defined as the way complex systems and patterns arise out of a multiplicity of relatively simple interactions. Emergent behavior based systems are believed to be scalable and robust due to their non-reliance on a critical central element or fragile hierarchy. In the talk, two novel distributed algorithms based on emergent behavior will be presented and their scalability and robustness will be discussed.
[לנוסח המלא]
Haifux Club: The Resource-as-a-Service (RaaS) Cloud
event speaker icon
אורנה אגמון בן-יהודה (מדעי המחשב, טכניון)
event date icon
יום שני, 3.9.2012, 18:30
event location icon
טאוב 6
Over the next few years, a new model of buying and selling cloud computing resources will evolve. Instead of providers exclusively selling server-equivalent virtual machines for relatively long periods of time (as done in today's IaaS clouds), they will increasingly sell individual resources (such as CPU, memory, and I/O resources) for a few seconds at a time. We term this nascent economic model of cloud computing the Resource-as-a-Service (RaaS) cloud, and we argue that its ...
[לנוסח המלא]
Combined Search Over Heterogeneous Repositories
event speaker icon
מירית שלם
event date icon
יום ראשון, 2.9.2012, 13:30
event location icon
טאוב 701
In complex search tasks that utilize information from several data sources, it is often required to pose several basic search queries, join the answers to these queries, where each answer is given as a ranked list of items, and return a ranked list of combinations. Example: A tourist Alice wants to find a festive event that is related to classical music, a good Italian restaurant and an underground station that contains an elevator, such that ...
[לנוסח המלא]
Haifux Club: Placing the Dots: On the Technical Challenges and Cultural Aspects of Typesetting Hebrew Vowel-Marks
event speaker icon
צבי גלבוע (אונ' וירג'יניה)
event date icon
יום שני, 20.8.2012, 18:30
event location icon
טאוב 6
This lecture will discuss the challenges presented by Hebrew vowel marks (nikud) with respect to glyph-placement and kerning in (La)TeX and under Linux, as well as the various approaches to date to meet these challenges, and likewise the cultural aspects of their causes and implications.
[לנוסח המלא]
Haifux Club: Where did Bilski Take Us? Patentability of Software Related Inventions
event speaker icon
דורון שרצקי (pczlaw.com)
event date icon
יום שני, 6.8.2012, 18:30
event location icon
טאוב 6
In the last two decades patenting software relations invention in the US was a flourishing business. Recent ruling by Federal Court and its affirmation in the Supreme Court of the US may seriously affect this. We will review the current legal status of software related patents in the US in view of this ruling as well as relate to the legal status in Europe and Israel. The recently enacted America Invents Act (AIA) will also ...
[לנוסח המלא]
CGGC Seminar: Linear Asymptotic Subdivision Schemes for Curves and Positive Definite Matrices
event speaker icon
אורי איתי (מתמטיקה, טכניון)
event date icon
יום ראשון, 5.8.2012, 13:00
event location icon
חדר 337, בניין טאוב למדעי המחשב
Subdivision schemes are attractive methods for generating a smooth object from discrete data by repeating refinements. These schemes have many desirable properties such as fast convergence and smoothness of the generated objects. Therefore, subdivision schemes have gained popularity in recent years as an important tool in approximation theory, computer graphics, geometric design and computer aided design. I will start with a survey on basic subdivision schemes. Then, I will review fundamental results in the field, ...
[לנוסח המלא]
Pixel Club: Multi-Camera People Tracking
event speaker icon
חורש בן-שטרית (לוזאן, שוויץ)
event date icon
יום שלישי, 31.7.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
At the CVLAB, EPFL, We have developed a multi-people tracking system. Our system is able to reliably track multiple people in a multi-camera setting. The obtained trajectories can be used for understanding individuals and group behavior. For example, we are currently involved in a project whose goal is to understand the behavior of basketball teams and players from multiple video cameras. Our system is composed of three core components: detection, identification and tracking. The detection ...
[לנוסח המלא]
Pixel Club: Nearest-Neighbor Searching Under Uncertainty, and Matching a Noisy Curves to a Maps
event speaker icon
אלון אפרת (אונ' אריזונה)
event date icon
יום שני, 30.7.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Nearest-neighbor queries, which ask for returning the nearest neighbor of a query point in a set of points, are important and widely studied in many fields because of a wide range of applications. In many of these applications, such as sensor databases, location based services, face recognition, and mobile data, the location of data is imprecise. We therefore study nearest neighbor queries in a probabilistic framework in which the location of each input point and/or ...
[לנוסח המלא]
Haifux Club: Git for Solo Projects Too
event speaker icon
אלי בילאר
event date icon
יום שני, 23.7.2012, 18:30
event location icon
טאוב 3
Git is well-known as the tool for collaborating in free software projects, and the Linux kernel in particular. What seems to be less known, is how useful it is even in a single developer scenario. This is a slideless, demostration-based talk, walking through the practical work with git as a most valuable tool for keeping a solo project under control, and helping in real-life situations. Git-savvy participants are also welcomed to share their experience.
[לנוסח המלא]
Pixel Club: Blind Source Separation of Underdetermined Time/Position Varying Mixtures
event speaker icon
יותם מיכאלי (הנדסת חשמל, טכניון)
event date icon
יום שלישי, 17.7.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Blind Source Separation (BSS) is a very applicable and well-studied problem. Most studies of the BSS problem assume the system to be time/position invariant, an assumption which assists the mathematical study, but is not guaranteed for real world situations. We present a method applicable to the case of underdetermined time/position varying mixing systems, where number of mixture observation is limited to be less than the number of sources and the system is changing with time/position ...
[לנוסח המלא]
Secure Multiparty Computation with Minimal Interaction
event speaker icon
ענת פסקין
event date icon
יום שלישי, 10.7.2012, 15:00
event location icon
טאוב 701
In the problem of secure multiparty computation (MPC) we have n parties who want to jointly evaluate a function f on their local inputs. An MPC protocol should allow the parties to correctly compute f while hiding the inputs from each other to the extent possible. An important complexity measure of MPC protocols is their round complexity. This talk will cover two questions related to the goal of minimizing the round complexity of MPC: * ...
[לנוסח המלא]
Pixel Club: Regularization Cascade for Join
event speaker icon
אלון צווייג (האונ' העברית בירושלים)
event date icon
יום שלישי, 10.7.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
We present a novel algorithm based on a cascade of regularization terms designed to induce implicit hierarchical sharing of information among related learning tasks. Our approach can be viewed as training and combining a set of diverse classifiers. Such a combination is known to improve accuracy. The diversity is achieved by inducing different levels of sharing among tasks. Our approach is designed for multi-task and multi-class learning scenarios. Enabling different levels of shared information is ...
[לנוסח המלא]
Haifux Club: Hebrew search: not a trivial task (Hebmorph)
event speaker icon
איתמר סין-הרשקו
event date icon
יום שני, 9.7.2012, 18:30
event location icon
טאוב 3
Search engines available today render almost useless when you need to process Hebrew texts. Even effective open-source solutions like Lucene/Solr give up in despair when handed a Hebrew corpus to index. HebMorph is an open-source project with the ultimate goal of solving this problem, and in the best way possible. In-depth understanding of how search engines work triggers ideas, ideas become software parts, and those in turn are experimented with various state of the art ...
[לנוסח המלא]
Bioinformatics Forum: Deciphering and Modeling the Gene Translation Code and Its Evolution via a Multidisciplinary Approach
event speaker icon
תמיר טולר (אונ' תל-אביב)
event date icon
יום רביעי, 4.7.2012, 15:30
event location icon
טאוב 701
Gene translation is a central process in all living organisms. Thus, developing a better understanding of this complex process and its computational modeling have ramifications to every biomedical discipline. We develop computational models of gene translation and employ evolutionary systems biology approaches to study how its efficiency is encoded in the transcripts. The talk will include details about our models and several very recent discoveries about the way evolution shapes the translation efficiency of transcripts.
[לנוסח המלא]
ceClub: Derandomizing Replication in Cloud
event speaker icon
אסף סידון (אונ' סטנפורד)
event date icon
יום רביעי, 4.7.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Randomized node selection is widely used in large-scale, distributed storage systems to both load balance chunks of data across the cluster and select replica nodes to provide data durability. We argue that while randomized node selection is great for load balancing, it fails to protect data under a common failure scenario. We present MinCopysets, a simple, general-purpose and scalable replication technique to improve data durability while retaining the benefits of randomized load balancing. Our contribution ...
[לנוסח המלא]
Pixel Club: Global Motion Estimation from Point Matches
event speaker icon
מיקה ארי-נימסון (מכון ויצמן למדע)
event date icon
יום שלישי, 3.7.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Multiview structure recovery from a collection of images requires the recovery of the positions and orientations of the cameras relative to a global coordinate system. We present an approach to this problem that given feature correspondences across pairs of images uses the pairwise Essential Matrices to recover camera orientation by applying robust optimization using either spectral or semidefinite programming relaxations. Once the orientations are recovered we return to the point correspondences and use them directly ...
[לנוסח המלא]
Pixel Club: Recent Results in 3D Urban Modelling
event speaker icon
אנדרי שרף (אונ' בן-גוריון)
event date icon
יום חמישי, 28.6.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Today's scanning technologies, allow fast 3D scanning of urban scenes. Such rapid acquisition incurs imperfections: large regions remain missing, significant variation in sampling density is common, and the data is often corrupted with noise and outliers. Buildings often exhibit large scale repetitions and self-similarities. To consolidate the imperfect data, our key observation is that the same geometry, when scanned multiple times over reoccurrences of instances, allow application of a simple and effective non-local filters. We ...
[לנוסח המלא]
Activity Recognition Under Uncertainty using Petri Nets
event speaker icon
גל לביא
event date icon
יום רביעי, 27.6.2012, 16:00
event location icon
טאוב 601
This talk considers the problem of recognizing activities in surveillance video. Activities are high-level non-atomic semantic concepts which may have complex temporal structure. Activities are not easily identifiable using image features, but rather by the recognition of their composing events. Unfortunately, these composing events may only be observed up to a particular certainty. Many approaches to classification/recognition in computer vision rely on the availability of a large corpus of training data. This data can be ...
[לנוסח המלא]
Spatial Proximity of Co-Regulated Yeast Genes
event speaker icon
שי בן-אלעזר
event date icon
יום רביעי, 27.6.2012, 14:30
event location icon
טאוב 401
While it has been long recognized that genes are not randomly disposed along the genome, the degree to which the three dimensional (3D) structure of the genome influences the arrangement of genes has remained elusive. In particular, 'transcriptional-factories' are thought to lead to the positioning co-regulated genes in physical proximity, however there have also been reports to the contrary. Here we present evidence that the co-localization of yeast genes regulated by the same factor is ...
[לנוסח המלא]
ceClub: CORFU: A Shared-Log Design for Network-Attached Flash
event speaker icon
דליה מלכי (מיקרוסופט, עמק הסיליקון)
event date icon
יום רביעי, 27.6.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
CORFU* is a novel storage cluster design that pools a farm of flash units and exposes it to clients as a single, global shared-log. CORFU utilizes flash to break the seeming tradeoff between consistency and performance, providing both strong consistency guarantees and high throughput. Our implementation is carried mostly by a client-side library, thus relieving the service from any IO bottlenecks; a CORFU cluster of 40 flash units can drive roughly 1 million 4-KByte ...
[לנוסח המלא]
Approximation Algorithms for Resource Scheduling and Allocation Problems
event speaker icon
מיכאל בדר
event date icon
יום רביעי, 27.6.2012, 11:30
event location icon
טאוב 601
We study the bandwidth allocation problem (BAP) and the storage allocation problem (SAP) in bounded degree trees. In BAP, we are given a tree and a set of tasks. Each task consists of a path in the tree, a bandwidth demand, and a weight. Our goal is to find a maximum weight subset S of tasks such that, for every edge e, the total bandwidth of demand in S whose path contains e does not ...
[לנוסח המלא]
Pixel Club: Place-Based Information Systems: Textual Location Identification and Visualization
event speaker icon
חנן סמט
event date icon
יום שלישי, 26.6.2012, 14:30
event location icon
חדר המליאה, קומה 7, בנין רבין
The popularity of web-based mapping services such as Google Earth/Maps and Microsoft Virtual Earth (Bing), has led to an increasing awareness of the importance of location data and its incorporation into both web-based search applications and the databases that support them. In the past, attention to location data had been primarily limited to geographic information systems (GIS), where locations correspond to spatial objects and are usually specified geometrically. However, in the web-based applications, the location ...
[לנוסח המלא]
Recursion in Distributed Computing
event speaker icon
Sergio Rajsbaum
event date icon
יום שלישי, 26.6.2012, 14:30
event location icon
חדר 337-8 טאוב.
Haifux Club: ZeroVM: Lightweight Containers Based on Google Native Client
event speaker icon
קמואל גלעדוב, LiteStack
event date icon
יום שני, 25.6.2012, 18:30
event location icon
טאוב 3
How cloud-friendly is traditional virtualization? As a matter of fact, all traditional virtualization technologies predate cloud era. Traditional virtualization has major advantage, they are backward compatible on binary level, making it easy to run in cloud any existing pre-cloud application. But what if backward compatability is not a requirement? What about new post-cloud applications, that are developed specifically for cloud? Is traditional virtualization still a good platform for them?
[לנוסח המלא]
Theory Seminar: From Irreducible Representations to Locally Decodable Codes
event speaker icon
קלים אפרמקו (אונ' תל-אביב)
event date icon
יום רביעי, 20.6.2012, 12:30
event location icon
טאוב 201
Locally Decodable Code (LDC) is a code that encodes a message in a way that one can decode any particular symbol of the message by reading only a constant number of locations, even if a constant fraction of the encoded message is adversarially corrupted. In this talk we will show connection between LDC and a representation theory. We show that if there exists an irreducible representation (\rho, V) of a group G and q elements ...
[לנוסח המלא]
ceClub: Sharing Virtual Memory between CPU and GPU
event speaker icon
בוריס גינזבורג (אינטל)
event date icon
יום רביעי, 20.6.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
This talk will discuss some system issues related to sharing virtual memory between CPU and GPU, which brings new challenges: GPU page faults, flashing a TLB on GPU, etc. We will also describe ESFIR - an SVM prototype, and XTHREAS - a new SVM programming models, which extends pthread semantics to GPU.
[לנוסח המלא]
TrustPack: a Decentralized Trust Management Framework
event speaker icon
עמית פורטנוי
event date icon
יום שלישי, 19.6.2012, 15:00
event location icon
טאוב 701
With the rise of the internet and its applications, it has became more and more common for unfamiliar parties to interact with each other. In order to help and encourage such interactions trust management systems were introduced. Those systems try to alleviate mistrust by gathering and processing statistical information about previous events. This thesis describes TrustPack, a trust management framework that provides trust management as a service, i.e., TrustPack is separated from any specific application ...
[לנוסח המלא]
Principles of Reasoning with Graphical Models
event speaker icon
Rina Dechter
event date icon
יום שלישי, 19.6.2012, 14:30
event location icon
חדר 337-8 טאוב.
A Semantic Approach To Graphic User Interface Programming
event speaker icon
מוטי פורת
event date icon
יום רביעי, 13.6.2012, 14:30
event location icon
טאוב 601
It is sometimes required to run the same application program on different platforms, from smartphones to PC's. The application may have to employ different User Interfaces (UI's) on different platforms, e.g. a UI designed for a large PC screen may not fit into the small screen of a smartphone. A different version of the application may therefore be needed for each platform kind. Kantorowitz and Lyakas introduced the use of platform-independent semantic user interfaces. As ...
[לנוסח המלא]
Continuous Symmetries of Non-rigid Shapes
event speaker icon
כרמי גרושקו
event date icon
יום רביעי, 13.6.2012, 14:30
event location icon
טאוב 401
Our world is known for its abundance of symmetric structures - in the fields of the animal kingdom, in astronomy, mathematics and chemistry, to name a few. The existence of symmetry in 3D shapes is of great interest when such applications as efficient storage, comparison and lookup are considered. Traditionally, only symmetries which are a composition of rotations and reflections were considered. These symmetries, termed extrinsic, have limited use in non-rigid shapes, as they are ...
[לנוסח המלא]
Theory Seminar: Tight Bounds for Parallel Randomized Load Balancing
event speaker icon
כריסטוף לנזן (האונ' העברית בירושלים)
event date icon
יום רביעי, 13.6.2012, 13:00
event location icon
טאוב 201
Active Learning Theory and Practice
event speaker icon
רון בגלייטר
event date icon
יום רביעי, 13.6.2012, 12:30
event location icon
טאוב 601
Supervised learning, one of the core models of machine learning, is concerned with inducing rules from a given sample of examples. Active learning is a variant of this model in which the learning algorithm can choose which examples to learn from. The performance of such active learners is measured by the "speed" of learning: The number of examples they consume in order to produce a competitive solution. In this talk, I will present a novel ...
[לנוסח המלא]
ceClub: Improved Bounds for Byzantine Self-Stabilizing Clock Synchronization
event speaker icon
כריסטוף לנזן (מכון ויצמן למדע)
event date icon
יום רביעי, 13.6.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
The challenging task of Byzantine self-stabilizing pulse synchronization requires that, in the presence of a minority of nodes that are permanently maliciously faulty, the non-faulty nodes must start firing synchronized pulses in a regular fashion after a finite amount of time, regardless of the initial state of the system. We study this problem under full connectivity in a model where nodes have local clocks of unknown, but bounded drift, and messages are delayed for an ...
[לנוסח המלא]
Autonomous Navigation within an Indoor Environment
event speaker icon
בוריס צ'רבאצקי
event date icon
יום רביעי, 13.6.2012, 10:30
event location icon
טאוב 601
We address the problem of robot navigation using natural visual features in a planar environment. The algorithm gets as an input a target, which is represented by a captured image from the targets pose, and a source image, captured from the starting position and should make an accurate move towards the target which can be decomposed as a rotation and translation on the plane. This algorithm can be used as a step in a higher ...
[לנוסח המלא]
Pixel Club: Multiscale Framework for Discrete Energy Minimization
event speaker icon
מירב גלון (מכון ויצמן למדע)
event date icon
יום שלישי, 12.6.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Discrete energy minimization is a ubiquitous task in computer vision, yet it is NP-hard in most cases. In this work we propose a multiscale framework for coping with the NP-hardness of discrete optimization. Our approach utilizes algebraic multiscale principles to efficiently explore the discrete solution space, yielding improved results on challenging energies for which current methods provide unsatisfactory approximations. In contrast to popular multiscale methods in computer vision that builds an image pyramid, our framework ...
[לנוסח המלא]
Theory Seminar: On Identity Testing of Tensors, Low-rank Recovery and Compressed Sensing
event speaker icon
מיכאל פורבס, MIT
event date icon
יום רביעי, 6.6.2012, 12:30
event location icon
טאוב 201
Let M be a low-rank matrix. For vectors x,y, define the bilinear form f(x,y)=x^t M y. We study the question of reconstructing M from evaluations to f. Much of previous work allowed randomized evaluations, or a stronger query model (or both). We show how to, in an optimal number of 4nr measurements, efficiently reconstruct M from deterministically chosen queries to f. This can be seen as a (noiseless) generalization of compressed sensing, and we make ...
[לנוסח המלא]
The surprises of Quick Sort
event speaker icon
Micha Hofri
event date icon
יום שלישי, 5.6.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Bounded Distortion Mapping Spaces for Triangular Meshes
event speaker icon
ירון ליפמן (אונ' פרינסטון)
event date icon
יום שלישי, 5.6.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
In this talk we introduce generic convex spaces of bounded distortion piecewise linear mappings of triangular meshes. It is shown how common geometric processing objective functionals can be restricted to these new spaces, rather than to the entire space of piecewise linear mappings, to provide a bounded distortion version of popular algorithms.
[לנוסח המלא]
TCE Guest Lecture: Lane Decoupling for Improving the Timing-Error Resiliency of Wide-SIMD Architectures
event speaker icon
מתן ארז (אונ' טקסס באוסטין)
event date icon
יום ראשון, 3.6.2012, 15:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
A significant portion of the energy dissipated in modern integrated circuits is consumed by the overhead associated with timing guardbands that ensure reliable execution. Timing speculation, where the pipeline operates at an unsafe voltage with any rare errors detected and resolved by the architecture, has been demonstrated to significantly improve the energy-efficiency of scalar processor designs. Unfortunately, applying the same timing-speculative approach to wide-SIMD architectures, such as those used in highly-efficient GPUs, may not provide ...
[לנוסח המלא]
CGGC Seminar: On the possibility of simple parallel computing of Voronoi diagrams and Delaunay Graphs
event speaker icon
דניאל רים (ברזיל)
event date icon
יום ראשון, 3.6.2012, 13:00
event location icon
חדר 337, בניין טאוב למדעי המחשב
Although many algorithms for computing Euclidean Voronoi diagrams of point sites have been published, most of them are sequential in nature and hence cast inherent difficulties on the possibility to compute the diagrams in parallel. We present a new algorithm which enables the (combinatorial) computation of each of the Voronoi cells independently of the other ones. The algorithm is significantly different from previous ones and some of the ideas related to it are in the ...
[לנוסח המלא]
Safe Zones: An Efficient Approach to Distributed Monitoring
event speaker icon
אמיר עבוד
event date icon
יום רביעי, 30.5.2012, 16:30
event location icon
טאוב 601
Many monitoring tasks over distributed data streams can be formulated as a continuous query using a function that is defined over the global average of data vectors derived from the streams. The query will typically produce an alert when the value of the function crosses a predefined threshold. A fundamental problem in efficient scalable implementation of such threshold queries is that the data streams are distributed, sometimes over a wide geographical region. Moving all the ...
[לנוסח המלא]
Coverage-Driven Refinement of Conceptual Representations
event speaker icon
חגי טולידנו
event date icon
יום רביעי, 30.5.2012, 13:30
event location icon
טאוב 601
Many text processing tasks are based on estimating semantic relatedness between texts. For example, in information retrieval, relevancy of documents can be determined based on the semantic distance from the query. Recently, many algorithms have been developed for evaluating semantic relatedness based on a conceptual representation of the input texts. The concept spaces for these algorithms are based, in most cases, on large repositories of knowledge, such as Wikipedia and Wordnet. These large concept spaces ...
[לנוסח המלא]
Theory Seminar: From Irreducible Representations to Locally Decodable Codes
event speaker icon
עופר ניימן (אונ' בן-גוריון)
event date icon
יום רביעי, 30.5.2012, 12:30
event location icon
טאוב 201
Given a set of $n$ points in $\ell_{1}$, how many dimensions are needed to represent all pairwise distances within a specific distortion ? This dimension-distortion tradeoff question is well understood for the $ell_{2}$ norm, where $O((\logn)/\epsilon^{2})$ dimensions suffice to achieve $1+\epsilon$ distortion. In sharp contrast, there is a significant gap between upper and lower bounds for dimension reduction in $\ell_{1}$. A recent result shows that distortion $1+\epsilon$ can be achieved with $O(n/\epsilon^{2})$ dimensions. On the ...
[לנוסח המלא]
Pixel Club: Incremental Light Bundle Adjustment For SfM And Multi-robot Localization
event speaker icon
ואדים אינדלמן (מכון טכנולוגי, ג'ורג'יה)
event date icon
יום רביעי, 30.5.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Fast and reliable bundle adjustment is essential in many structure from motion (SfM) related applications such as mobile vision, augmented reality and robotics. In this talk an incremental and computationally efficient method for bundle adjustment will be presented. The method incorporates two key ideas to substantially reduce the involved computational cost, compared to a conventional bundle adjustment. First, the cost function is formulated in terms of multi-view constraints instead of re-projection equations, thereby eliminating the ...
[לנוסח המלא]
ceClub: A Virtual Mobile Smartphone Architecture
event speaker icon
אורן לאדן (אונ' קולומביה)
event date icon
יום רביעי, 30.5.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Smartphones are increasingly ubiquitous, and many users carry multiple phones to accommodate work, personal, and geographic mobility needs. We present Cells, a virtualization architecture for enabling multiple virtual smartphones to run simultaneously on the same physical cellphone in an isolated, secure manner. Cells introduces a usage model of having one foreground virtual phone and multiple background virtual phones. This model enables a new device namespace mechanism and novel device proxies that integrate with lightweight operating ...
[לנוסח המלא]
Computing in the 21st Century: The Georgia Tech Model
event speaker icon
Zvi Galil
event date icon
יום שלישי, 29.5.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Reporting Neighbors in High-Dimensional Euclidean Space
event speaker icon
דרור אייגר (גוגל)
event date icon
יום שלישי, 29.5.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
We consider the following problem, which arises in many database and web-based applications: Given a set $P$ of $n$ points in a high-dimensional space $\reals^d$ and a distance $r$, we want to report all pairs of points of $P$ at Euclidean distance at most $r$. We present two randomized algorithms, one based on randomly shifted grids, and the other on randomly shifted and rotated grids. The expected performance of both algorithms is of the form ...
[לנוסח המלא]
ceClub: Dr. Philip M. Merlin Memorial Lecture and Prize Award: Scheduling Algorithms for the 4G Cellular Networks
event speaker icon
ראובן כהן (מדעי המחשב, טכניון)
event date icon
יום רביעי, 23.5.2012, 14:30
event location icon
חדר 1003, בניין מאייר, הפקולטה להנדסת חשמל
Cellular networks are becoming more and more crucial to our daily lives and operators are seeking new technologies for increasing their bandwidth. Examples for such technologies are cell sectorization, fractional frequency reuse, and coordinated multipoint Tx/Rx. To take advantage of these new technologies, the scheduler logic at the base station needs to determine not only when to transmit each packet but also what modulation and coding scheme to use, which frequency reuse area's resources, and ...
[לנוסח המלא]
Theory Seminar: Optimal Testing of Multivariate Polynomials over Small Prime Field
event speaker icon
אלעד הרמתי (מדעי המחשב, טכניון)
event date icon
יום רביעי, 23.5.2012, 12:30
event location icon
טאוב 201
We consider the problem of testing if a given function f is close to a n-variate degree d polynomial over the finite field of q elements. The natural, low-query, test for this property would be to pick the smallest dimension t= t(q,d )≈ d/q such that every function of degree greater than d reveals this feature on some t-dimensional affine subspace and to test that f when restricted to a random t-dimensional affine subspace is ...
[לנוסח המלא]
The Complexity of Cryptography
event speaker icon
Yuval Ishai
event date icon
יום שלישי, 22.5.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Human Attributes from 3D Pose Tracking
event speaker icon
מיכה לבנה (אונ' טורונטו)
event date icon
יום שלישי, 22.5.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
This talk concerns the estimation of human attributes from 3D human pose and motion. We consider both physical attributes (eg, gender and weight) and aspects of mental state (eg, mood). This task is useful for man-machine communication, and it provides a natural benchmark for evaluating the performance of 3D pose tracking methods. Based on an extensive corpus of motion capture data, with physical and perceptual ground truth, we analyze the inference of subtle biologically-inspired attributes ...
[לנוסח המלא]
Theory Seminar: Extractors for Polynomials Sources over Constant-Size Fields of Small Characteristic
event speaker icon
אריאל גביזון (מדעי המחשב, טכניון)
event date icon
יום רביעי, 16.5.2012, 12:30
event location icon
טאוב 201
Let F be the field of q elements, where q=p^l for prime p. Informally speaking, a polynomial source is a distribution over F^n sampled by low degree multivariate polynomials. In this paper, we construct extractors for polynomial sources over fields of constant size q assuming p For instance, suppose a distribution X over F^n has support size q^k and is sampled by polynomials of individual degree d and total degree D. When p, D and ...
[לנוסח המלא]
ceClub:Dynamic Reconfiguration of Primary/Backup Clusters
event speaker icon
אלכס שרייר (יאהו! מחקר)
event date icon
יום רביעי, 16.5.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Dynamically changing (reconfiguring) the membership of a replicated distributed system while preserving data consistency and system availability is a challenging problem. In this talk I will discuss this problem in the context of Primary/Backup clusters and Apache Zookeeper. Zookeeper is an open source system which enables highly reliable distributed coordination. It is widely used in industry, for example in Yahoo!, Facebook,Twitter, VMWare, Box, Cloudera, Mapr, UBS, Goldman Sachs, Nicira, Netflix and many others. A common ...
[לנוסח המלא]
Haifux Club: InfiniBand, RoCE and RDMA Verbs - Empowering Supercomputing and Data Center Interconnects
event speaker icon
דותן ברק (מלאנוקס)
event date icon
יום שני, 14.5.2012, 18:30
event location icon
טאוב 3
This lecture aims to provide a brief introduction to the InfiniBand™ architecture and programming using RDMA verbs. InfiniBand is an open standard, used in HPC (supercomputing) and data center environments for high performance connectivity. This standard defines a complete fabric architecture, from the physical layer all the way to the programming API. The programming API, also known as RDMA verbs, allows for transparent memory operations over the network, transport layer offloading, and a complete kernel ...
[לנוסח המלא]
Theory Seminar: Fully Dynamic Approximate Distance Oracles for Planar Graphs via Forbidden-Set Distance Labels
event speaker icon
שירי צ'צ'יק (מכון וייצמן למדע)
event date icon
יום רביעי, 9.5.2012, 12:30
event location icon
טאוב 201
Distance oracle is a data structure that provides fast answers to distance queries. Recently, the problem of designing distance oracles capable of answering restricted distance queries, that is, estimating distances on a subgraph avoiding some forbidden vertices, has attracted a lot of attention. In this talk, we will consider forbidden set distance oracles for planar graphs. I’ll present an efficient compact distance oracle that is capable of handing any number of failures. In addition, we ...
[לנוסח המלא]
ceClub: Self-Adjusting Networks and Distributed Data Structures
event speaker icon
חן אבין (אונ' בן-גוריון)
event date icon
יום רביעי, 9.5.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
We study self-optimizing networks and data structures. The goal of this research line is the design of fully distributed algorithms which flexibly adapt the network to a dynamic environment such as changing demands or traffic patterns. The idea of self-adjusting networks is motivated by trends in today's Internet like large data centers and peer-to-peer networks. In this talk I will preset the general model of the problem and some initial theoretical results on data centers ...
[לנוסח המלא]
Functions which are close to being k-local are juntas
event speaker icon
Guy Kindler
event date icon
יום שלישי, 8.5.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Viewpoint-Aware Object Detection and Pose Estimation
event speaker icon
דניאל גלזנר (יפורסם)
event date icon
יום שלישי, 8.5.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
We describe an approach to category-level detection and viewpoint estimation for rigid 3D objects from single 2D images. In contrast to many existing methods, we directly integrate 3D reasoning with an appearance-based voting architecture. Our method relies on a nonparametric representation of a joint distribution of shape and appearance of the object class. Our voting method employs a novel parametrization of joint detection and viewpoint hypothesis space, allowing efficient accumulation of evidence. We combine this ...
[לנוסח המלא]
Haifux Club: Scientific Python
event speaker icon
אורי ברקן
event date icon
יום שני, 7.5.2012, 18:30
event location icon
טאוב 3
לקראת המחצית השנייה של המאה ה-20 החל להיווצר תפקיד משמעותי למחשבים במחקר המדעי. התקדמות הפלטפורמות החישוביות, בד בבד עם פיתוח נושאים מחקריים מורכבים שדרשו פתרונות נומריים ולא אנליטיים (דוגמת פרוייקט מנהטן, לפיתוח פצצת האטום האמריקאית בזמן מלחמת העולם השנייה), גרמו לפריחה של שיטת מחקר חדשה בעולם המדעי: שימוש במחשבים לצורך הרחבה ושיפור הבנתנו את הטבע. בתכנות מדעי משתמשים בתוכנות מחשב לטובת מחקר של תהליכים. כיום משמשת השיטה כמעט בכל תחום מדעי: מתמטיקה, פיסיקה, ביולוגיה, רפואה, ...
[לנוסח המלא]
Theory Seminar: Random Arithmetic Formulas can be Reconstructed Efficiently
event speaker icon
אנקיט גופטה (מדעי המחשב, טכניון)
event date icon
יום רביעי, 2.5.2012, 12:30
event location icon
טאוב 201
What is an optimal formula computing a given multivariate polynomial $f$? In this work, we show that this question admits an efficient algorithmic solution in an average-case sense. Specifically, we consider the following situation. Let $\F$ be a field, $S \subseteq \F$ be a finite subset of field elements, $\vecX =(X_1, X_2, \ldots, X_n) $ be a tuple of formal variables and $\Delta \geq 0 $ be an integer representing the product-depth of the hidden ...
[לנוסח המלא]
How Do Classes Choose Their Parents? (Preferential Attachment to the Trial)
event speaker icon
Yossi Gil
event date icon
יום שלישי, 1.5.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Learning Feature Descriptors
event speaker icon
אלכס ברונשטיין (אונ' ת"א)
event date icon
יום שלישי, 1.5.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
SIFT-like local feature descriptors are ubiquitously employed in such computer vision applications as content-based retrieval, video analysis, copy detection, object recognition, photo-tourism, and 3D reconstruction from multiple views. Feature descriptors can be designed to be invariant to certain classes of photometric and geometric transformations, in particular, affine and intensity scale transformations. However, real transformations that an image can undergo can only be approximately modeled in this way, and thus most descriptors are only approximately invariant ...
[לנוסח המלא]
Extracting Meaning from Search Behavior Data
event speaker icon
Eugene Agichtein
event date icon
יום שלישי, 24.4.2012, 14:30
event location icon
חדר 337-8 טאוב.
Haifux Club: Modern Web Development in Perl
event speaker icon
גאבור זאבו
event date icon
יום שני, 23.4.2012, 18:30
event location icon
טאוב 3
Back in the early years of the dynamic web, Perl was the de-facto choice of language. It was so ubique that people associated it with CGI. For that, even today, Perl suffers from a bad image. Even though, under the visible surface, there are strong powers leading to a much better future. In the last couple of years a new bread of frameworks appeared in the Perl world. They are all based on the PSGI ...
[לנוסח המלא]
Theory Seminar: Pseudorandom Generators with Large Stretch and Low Locality from Random Local One-Way Functions
event speaker icon
בני אפלבאום (אונ' ת"א)
event date icon
יום ראשון, 22.4.2012, 13:00
event location icon
טאוב 201
Locally-computable pseudorandom generators (PRGs) map n random input bits into m>n pseudorandom bits such that each of the m outputs depend on a small number of d inputs. While it is known that such generators are likely to exist for the case of small sub-linear stretch m=n+n^{0.9}, it is less clear whether achieving larger stretch is possible. The existence of such PRGs, which was posed as an open question in previous works, has recently gained ...
[לנוסח המלא]
CGGC Seminar: Towards Unencumbered 3D Teleconferencing Systems
event speaker icon
טיבריו פופה (ציריך)
event date icon
יום חמישי, 19.4.2012, 11:15
event location icon
חדר 337, בניין טאוב למדעי המחשב
With the recent development of auto-multiscopic 3D displays that provide a 3D experience without the use of glasses, and with the recent availability of inexpensive hybrid depth/color cameras such as the Kinect, that provide real-time geometric and texture information, we are a step closer to realizing unencumbered 3D teleconferencing systems. However, many challenges still remain to be solved. In this talk, I will present two teleconferencing software solutions based on the Kinect. The first is ...
[לנוסח המלא]
TCE Lecture: Green Cellular Networks: A Survey, Some Research Issues and Challenges
event speaker icon
Vijay K. Bhargava (University of British Columbia and President, IEEE Communications Society)
event date icon
יום רביעי, 18.4.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
In this talk, we present techniques to enable green communications in future generation of wireless systems that will rely on cooperation and cognition to meet increasing demand of high data rate. So far, achieving high data rate has been the primary focus of research in cooperative and CR systems, without much consideration of energy efficiency. However, many of these techniques significantly increase system complexity and energy consumption. Escalating energy costs and environmental concerns have already ...
[לנוסח המלא]
Improved Competitive Ratio for the Matroid Secretary Problem
event speaker icon
Oded Lachish
event date icon
יום שלישי, 17.4.2012, 14:30
event location icon
חדר 337-8 טאוב.
Adaptive Reconstruction Methods for Low-Dose Computed Tomography
event speaker icon
יוסי שטוק
event date icon
יום חמישי, 5.4.2012, 11:30
event location icon
טאוב 337
The main problem with contemporary Computed Tomography (CT) imaging is the high radiation dose absorbed by patients during the screening. Reducing this dose may result in poor quality imaging when using the popular fast and direct reconstruction techniques. On the other hand, iterative methods powered by statistical models of the scan are better-performing in such cases, but are also very slow. To bridge the gap between these two solutions, various signal processing techniques that augment ...
[לנוסח המלא]
Resource Management in Grid Environments
event speaker icon
פבל בר
event date icon
יום רביעי, 4.4.2012, 14:00
event location icon
טאוב 601
Grid computing environments have become mission-critical components in research and industry, offering sophisticated solutions to exploit large computing and storage resources across multiple geographic locations and administrative domains. Usually, such grid resources are non-dedicated or opportunistic, as a consequence users will utilize the resources following a "best effort" approach. However, many real-world supercomputing applications, such as computational fluid dynamics, weather forecasting, and complex system simulations, rely on coallocation of large numbers of reliable resources as ...
[לנוסח המלא]
Algebraic Collocation Coarse Approximation (ACCA) in Multigrid
event speaker icon
רן צמח
event date icon
יום רביעי, 4.4.2012, 12:30
event location icon
טאוב 601
Most algebraic multigrid (AMG) methods define the coarse operators by applying the (Petrov-) Galerkin coarse approximation (GCA) where the sparsity pattern and operator complexity of the multigrid hierarchy are dictated by the multigrid transfer operators (prolongation and restriction). Therefore, AMG algorithms must usually settle on some compromise between the quality of the transfer operators and the aggressiveness of the coarsening, which affect the complexity of the hierarchy of operators and the overall rate of convergence. ...
[לנוסח המלא]
Labelings and Partitions of Graphs
event speaker icon
רועי שוורץ
event date icon
יום רביעי, 4.4.2012, 12:30
event location icon
טאוב 201
The study of combinatorial problems with a submodular objective function has attracted much attention in recent years, and is partly motivated by the importance of such problems to combinatorial optimization, economics, and algorithmic game theory. A partial list of well-known problems captured by submodular maximization includes: Max-Cut, Max-DiCut, Max-k-Cover, Generalized-Assignment, several variants of Max-SAT and some welfare and scheduling problems. While classical works on submodular maximization problems are mostly combinatorial in nature, many recent results ...
[לנוסח המלא]
Theory Seminar: Labelings and Partitions of Graphs
event speaker icon
רועי שורץ (מדעי המחשב, טכניון)
event date icon
יום רביעי, 4.4.2012, 12:30
event location icon
טאוב 201
The study of combinatorial problems with a submodular objective function has attracted much attention in recent years, and is partly motivated by the importance of such problems to combinatorial optimization, economics, and algorithmic game theory. A partial list of well-known problems captured by submodular maximization includes: Max-Cut, Max-DiCut, Max-k-Cover, Generalized-Assignment, several variants of Max-SAT and some welfare and scheduling problems. While classical works on submodular maximization problems are mostly combinatorial in nature, many recent results ...
[לנוסח המלא]
Determining the Winner of a Dodgson Election is Hard
event speaker icon
Professor Frances Rosamond
event date icon
יום שלישי, 3.4.2012, 14:30
event location icon
חדר 337-8 טאוב.
Bioinformatics Forum: Biomed Data at Work
event speaker icon
יוג'ין קולקר (בי"ח לילדים בסיאטל ואונ' וושינגטון, ארה"ב)
event date icon
יום שלישי, 3.4.2012, 13:30
event location icon
חדר סמינרים במקלט, בניין ביולוגיה, טכניון,
Access to high-quality data drives our ability to ask questions and find answers. Our lab has a number of projects based on this premise. Proteomics data from experimental research in diabetes has enabled the discovery of two promising beta cell regulators, Netrin and Sem3a. We have built MOPED, a human and model organisms’ protein expression database, to provide a comprehensive summary of publicly available proteomics data. With MOPED, users can browse, sort, query, visualize, and ...
[לנוסח המלא]
Pixel Club: Generalized Projection Based M-estimator
event speaker icon
פטר מיר (אונ' רוטגרס)
event date icon
יום שלישי, 3.4.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
A new robust estimation algorithm, the generalized projection based M-estimator (gpbM) is proposed. The algorithm is general and can handle heteroscedastic data where every point in the estimation have a different covariance. Does not require the user to specify any (scale) parameters, and can be applied to multiple linear constraints for single and multi-carrier problems. The gpbM has three distinct stages: scale estimation, robust model estimation and inlier/outlier dichotomy. The model estimation stage can be ...
[לנוסח המלא]
Haifux Club: Automatic Parallelization in GCC
event speaker icon
רזיה לדלסקי (י.ב.מ. מחקר ופיתוח חיפה)
event date icon
יום שני, 2.4.2012, 18:30
event location icon
טאוב 6
With the emergence of multicore architectures there is a growing need for automatic parallelization, that distributes sequential code into multi threaded code. OpenMP defines language extensions to C, C++, and Fortran for implementing multi-threaded shared memory applications. Generation of such extensions by the compiler relieves programmers from the manual parallelization process. OpenMP specification has been implemented in GCC, and is part of the standard release since version 4.2. In this talk we review the OpenMP ...
[לנוסח המלא]
The algorithmization of causes and counterfactuals
event speaker icon
Judea Pearl, Special Guest Talk, Harvey Prize and Turing Award Winner,
event date icon
יום חמישי, 29.3.2012, 11:00
event location icon
CS טאוב Build. Auditorium 2
Cache or Charge? Cooperative Caching with Credits
event speaker icon
גלה ידגר
event date icon
יום רביעי, 28.3.2012, 12:30
event location icon
טאוב 601
In cooperative storage caching, clients may access blocks directly from each other's caches. Previous studies treated all the cooperating caches as a single pool, maximizing overall system performance at the price of possibly degraded performance for individual clients. In light of the popularity of many P2P mechanisms, we re-evaluate the concept of cooperative caching, considering selfish clients that cooperate only if they benefit from the interaction. This is the first study that considers selfish clients ...
[לנוסח המלא]
Theory Seminar: On the complexity of the Furthest Hyperplane Problem
event speaker icon
זוהר קרנין (יאהו! מחקר)
event date icon
יום רביעי, 28.3.2012, 12:30
event location icon
טאוב 201
This paper introduces the Furthest Hyperplane Problem (FHP), which is an unsupervised counterpart of Support Vector Machines. Given a set of n points in R^d, the objective is to produce the hyperplane (passing through the origin) which maximizes the separation margin, that is, the minimal distance between the hyperplane and any input point. To the best of our knowledge, this is the first paper achieving provable results regarding FHP. We provide both lower and upper ...
[לנוסח המלא]
ceClub: Improving Virtualization Performance Through Phy
event speaker icon
נדב עמית (מדעי המחשב, טכניון)
event date icon
יום רביעי, 28.3.2012, 11:30
event location icon
טאוב 401
Machine virtualization, where many virtual machines run on a single physical machine, has become an increasingly popular area of research and development in the last decade. Despite the introduction of hardware support for machine virtualization in commodity servers, many workloads still suffer from degraded performance when run in virtual machines. This degradation can be particularly acute when an unmodified virtual machine -- a VM that is not aware it is running in a virtual environment ...
[לנוסח המלא]
Parameterizing on the Number of Numbers
event speaker icon
Prof. Michael Fellows
event date icon
יום שלישי, 27.3.2012, 14:30
event location icon
חדר 337-8 טאוב.
TCE Lecture: Consistent Hashing, Danny Lewin, and the Creation of Akamai
event speaker icon
תום לייטון - MIT
event date icon
יום שלישי, 27.3.2012, 11:00
event location icon
מוסד נאמן, טכניון
In 1996, twelve years after making Aliyah to Israel, Danny Lewin graduated from the Technion and came to MIT to study algorithms. Over the next few years, he wrote a prize-winning Master’s Thesis on Consistent Hashing and co-founded Akamai Technologies, which today accelerates the delivery of over 250,000 web sites, including all of the top media and commerce brands on the Web. In this talk, we will describe some of Danny’s early work on consistent ...
[לנוסח המלא]
מועדון היזמות: איך מקימים סטארט-אפ?!
event speaker icon
עופר וילנסקי - Jungo
event date icon
יום שני, 26.3.2012, 18:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
תמיד חלמתם להקים סטארט אפ ולא ידעתם איך מתחילים? רוצים ללמוד מטעויות של מסודרים? בואו להפגש, להקשיב ולשאול את אלו שעשו את זה בגדול!
[לנוסח המלא]
CSpecial Talk: Unified Algorithms for Online Learning and Competitive Analysis
event speaker icon
שחר חן (מדעי המחשב, טכניון)
event date icon
יום ראשון, 25.3.2012, 16:30
event location icon
טאוב 601
Online learning and competitive analysis are two widely studied frameworks for online decision-making settings. Despite the frequent similarity of the problems they study, there are significant differences in their assumptions, goals and techniques, hindering a unified analysis and richer interplay between the two. In this work, we provide several contributions in this direction. We provide a single unified algorithm which by parameter tuning, interpolates between optimal regret for learning from experts (in online learning) and ...
[לנוסח המלא]
Approximating Semidefinite Programs In Sublinear Time
event speaker icon
דן גרבר
event date icon
יום רביעי, 21.3.2012, 16:00
event location icon
טאוב 701
Semidefinite programming is a fundamental problem in convex programming with numerous applications. In the field of combinatorial optimization, many approximation algorithms that rely on sdp have been discovered in the past two decades starting with the work of Goemans and Williamson on MAX-CUT. In the field of machine learning solving sdps is at the heart of many learning tasks such as learning a distance metric and matrix completion. In ML in particular, the amounts of ...
[לנוסח המלא]
Automatic Extraction of Subcategorization Frames for Hebrew
event speaker icon
חנה פדידה
event date icon
יום רביעי, 21.3.2012, 14:30
event location icon
טאוב 701
Verb subcategorization frames determine the number and types of the syntactic arguments that verbs select, or subcategorize for. Typically, verbs can be associated with subcategorization frames that specify, for each subcategorized argument, information on the phrases that can realize this argument. These can be noun phrases (in the case of direct objects), prepositional phrases with one or more specific preposition, infinitival verb phrases, clauses introduced by a complementizer, etc. We introduce a technique and an ...
[לנוסח המלא]
Bioinformatics Forum: Global sampling of Macromolecular Association Energy landscapes using Fast Fourier Transforms and their Generalizations
event speaker icon
דימה קוזקוב (אונ' בוסטון)
event date icon
יום רביעי, 21.3.2012, 13:00
event location icon
חדר סמינרים, קומה 4, בניין אמרסון, טכניון
Sampling energy landscape of macromolecular interactions is a challenging problem of computational biology. Classical approaches like Molecular Dynamics and Monte Carlo are not always optimal for these applications due to large configurational space of the problem. On contrary The Fast Fourier Transform (FFT) correlation sampling approach can exhaustively evaluate the energies of billions of macromolecular configuratins on a grid provided two limitations - the energy is described in the form of a correlation function and ...
[לנוסח המלא]
Theory Seminar: Monotone Unification Problems
event speaker icon
פבל רובס (אונ' פרינסטון)
event date icon
יום רביעי, 21.3.2012, 12:30
event location icon
טאוב 201
Given two monotone polynomials f,g, their unifier is a pair of monotone polynomials u,v such that f=cu+v and g=u+cv, for some c>0. The problem I will discuss is: can we have monotone polynomials f,g which have a unifier, they can be computed by a small monotone circuit, but every unifier of f,g requires a large monotone circuit? On one hand, the question is related to arithmetic circuit complexity, and on the other, to the complexity ...
[לנוסח המלא]
Pixel Club: Not Your Typical Pixel: On "Cortical Vision" without Visual Cortex
event speaker icon
אוהד בן-שחר (אונ' בן-גוריון)
event date icon
יום שלישי, 20.3.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Our visual attention is attracted by salient stimuli in our environment and affected by primitive features such as orientation, color, and motion. Perceptual saliency due to orientation contrast has been extensively demonstrated in behavioral experiments with humans and other primates and is commonly explained by the very particular functional organization of the primary visual cortex. We challenge this prevailing view by studying orientation-based visual saliency in two non-mammalian species with enormous evolutionary distance to humans. ...
[לנוסח המלא]
Haifux Club: Software Tools for Reconfigurable Architectures
event speaker icon
ויקטור קפלנסקי (י.ב.מ. מחקר ופיתוח חיפה)
event date icon
יום שני, 19.3.2012, 18:30
event location icon
טאוב 6
Reconfigurable computing allows a lower power consumption to achieve higher performance than software, while maintaining a higher level of flexibility than hardware. Reconfigurable devices, such as field-programmable gate arrays (FPGAs), contain an array of computational elements whose functionality is determined through multiple programmable configuration bits. The hardware can be re-programmed to implement an entirely different circuit. The focus of the research project ERA (Embedded Reconfigurable Architectures) is to investigate and propose new methodologies in both ...
[לנוסח המלא]
ceClub: PCI Express: Technology, Road Map and Design Challenges
event speaker icon
ריק אידס (אג'ילאי טכנולוגיות)
event date icon
יום שני, 19.3.2012, 15:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
PCI Express is an industry standard, and the most prominent interconnection architecture for I/O devices and other boards inside a computer. It is defined and updated by the PCI-SIG(R) industry standards body, originally formed in 1992 as the Peripheral Component Interconnect (PCI) special interest group (SIG). Agilent Technologies, a prominent developer and provider of test equipment at all levels yet not a competitor in the computer market, has played a key role in the advancement ...
[לנוסח המלא]
Pixel Club: Geometric constraints in shape analysis
event speaker icon
דן רביב (מדעי המחשב, טכניון
event date icon
יום שני, 19.3.2012, 10:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Traditional models of bendable surfaces are based on the exact or approximate invariance to deformations that do not tear or stretch the shape, leaving intact an intrinsic geometry associated with it. Intrinsic geometries are typically defined by shortest paths also known as geodesic distances, or diffusion processes on the surface like diffusion distances. Both methods are implicitly derived from the metric induced by the ambient Euclidean space. Here, we depart from this restrictive assumption by ...
[לנוסח המלא]
Quantum Neural Computation and Associative Memory
event speaker icon
תאמר סלמאן
event date icon
יום רביעי, 14.3.2012, 16:30
event location icon
טאוב 701
This thesis presents quantum analogues of artificial neural networks. We analyze and compare their performance to known classical and previously proposed quantum models. First we propose a model for associative memory based on a modification of Grover's quantum search algorithm and prove that the capacity of the model is exponential in the number of bits. We present algorithms for pattern completion and correction and prove that the model does not suffer from spurious memories and ...
[לנוסח המלא]
A Study of Data Structures with a Deep Heap Shape
event speaker icon
חגי ערן
event date icon
יום רביעי, 14.3.2012, 15:00
event location icon
טאוב 701
Computing environments become increasingly parallel, and it seems likely that we will see more cores on tomorrow's desktops and server platforms. In a highly parallel system, tracing garbage collectors may not scale well due to deep heap structures that hinder parallel tracing. In this work we start by analyzing which data structures make current Java benchmarks create deep heap shapes. It turns out that the problem is manifested mostly with benchmarks that employ queues and ...
[לנוסח המלא]
Finding Malware on a Web Scale
event speaker icon
Ben Livshits SPECIAL GUEST LECTURE,
event date icon
יום רביעי, 14.3.2012, 14:30
event location icon
חדר 539 טאוב.
Violation Resolution in Distributed Stream Networks
event speaker icon
דוד בן-דוד
event date icon
יום רביעי, 14.3.2012, 13:00
event location icon
טאוב 701
Threshold monitoring applications in distributed stream networks contin- uously monitor the global score of the network and alert whenever a given threshold is crossed. The network's global score is computed by applying a certain scoring function over the aggregated data derived from the network streams. However, the sheer volume and dynamic nature of the streams impose excessive communication overhead. Recently, the concept of local constraints have been presented in which the individual streams are assigned ...
[לנוסח המלא]
Theory Seminar: Causality, Knowledge and Coordination in Synchronous Systems
event speaker icon
עידו בן-צבי (הנדסת חשמל, טכניון)
event date icon
יום רביעי, 14.3.2012, 12:30
event location icon
טאוב 601
Coordinating the proper ordering of events across remote sites is a central task of distributed applications. In asynchronous systems, such coordination depends in an essential way upon message chains, as captured by Lamport's happened-before relation. The relation provides a useful approximation of causality, in the sense that in asynchronous systems two event can only be causally related if they are Lamport related. The talk will consider coordination and causality in synchronous systems, where upper bounds ...
[לנוסח המלא]
Bioinformatics Forum: Systems Biology of Viral Pathogenesis and Immunity: Where are Google and IBM?
event speaker icon
מיכאל קטצה
event date icon
יום רביעי, 14.3.2012, 11:30
event location icon
טאוב 401
After decades of research, vaccines against some of the greatest viral threats are still lacking and antiviral drugs remain few and slow in coming. These shortcomings point to the need for new approaches that go beyond traditional virology methods. High-throughput technologies and computational biology promise to deliver a much-needed boost to the field. My laboratory is using systems biology and computational approaches to understand and model integrated views of virus-host interactions, viral evasion of host ...
[לנוסח המלא]
TCE Guest Lecture: Obstacles and Chances for Multi-core Deployment in Hard Real-time Systems
event speaker icon
פרופ' תיאו אונגרר (אונ' אוגסברג, גרמניה)
event date icon
יום שלישי, 13.3.2012, 14:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Providing higher performance than state-of-the-art embedded processors can deliver today will increase safety, comfort, number and quality of services, while also lowering emissions as well as fuel demands for automotive, avionic and automation applications. Engineers who design hard real-time embedded systems in such embedded domains express a need for several times the performance available today while keeping safety as major criterion. A breakthrough in performance is expected by parallelising hard real-time applications and running them ...
[לנוסח המלא]
NUMA and locality aware multi-core software
event speaker icon
אלעד גדרון
event date icon
יום שני, 12.3.2012, 14:00
event location icon
טאוב 701
Emerging computer architectures pose many new challenges for software development. First, as the number of computing elements constantly increases, the importance of scalability of parallel programs becomes more significant. Second, accessing memory has become the principal bottleneck, while multi-CPU systems are based on NUMA architectures, where memory access from different chips is asymmetric. Therefore, it is important to design software with local data access, cache-friendliness, and reduced contention on shared memory locations, especially across chips. ...
[לנוסח המלא]
Learning Linear Support Vector Machines in Sublinear Time
event speaker icon
תומר קורן
event date icon
יום רביעי, 7.3.2012, 14:30
event location icon
טאוב 701
In recent years, stochastic approximation approaches such as Stochastic Gradient Descent (SGD) and Stochastic Dual Averaging have become the optimization method of choice for many learning problems, including linear Support Vector Machines (SVMs). This is not surprising, since such methods yield optimal generalization guarantees with only a single pass over the data. They in a sense have an unbeatable runtime: the runtime to get to a desired generalization goal is the same as the size ...
[לנוסח המלא]
Approximation Algorithm for Soft-Capacitated Connected Facility
event speaker icon
אסף רפפורט
event date icon
יום שלישי, 6.3.2012, 14:00
event location icon
טאוב 601
Data centers are becoming the hosting platform for a wide spectrum of composite applications. In recent years, large investments have been made in massive data centers supporting cloud services, by companies such as eBay, Facebook, Google, Microsoft, and Yahoo!. With an increasing trend towards global and more communication intensive applications, the bandwidth usage within and between data centers is rapidly growing. The placement of the data used by these global applications presents a challenging optimization ...
[לנוסח המלא]
Matrix Learning: A Tale of Two Norms
event speaker icon
Nati Srebro
event date icon
יום רביעי, 29.2.2012, 14:30
event location icon
חדר 337-8 טאוב.
Polar codes: construction and improved decoding
event speaker icon
Ido Tal
event date icon
יום שלישי, 28.2.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Hierarchical Invariant Sparse Modeling for Image Analysis
event speaker icon
לאה בר (אונ' מינסוטה)
event date icon
יום שלישי, 21.2.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Sparse representation theory has been increasingly used in signal processing and machine learning. In this work we introduce a hierarchical sparse modeling approach which integrates information from the image patch level to derive a mid-level invariant image and pattern representation. The proposed framework is based on a hierarchical architecture of dictionary learning for sparse coding in a cortical (log-polar) space, combined with a novel pooling operator which incorporates the Rapid transform and max pooling to ...
[לנוסח המלא]
Haifux Club: Making Hebrew Slides with LaTeX and Beamer
event speaker icon
גאי שקד
event date icon
יום שני, 20.2.2012, 18:30
event location icon
טאוב 6
LaTeX is a high-quality typesetting system; BEAMER is is a LaTeX class for creating presentations; Hebrew is an esoteric west Semitic language we happen to speak. This talk will cover all three, by the end of the talk you will be able to create beautiful and comprehensive Hebrew presentations using Beamer in minutes. The talk assumes prior knowledge in Hebrew, but not in LaTeX nor Beamer. We will cover basic concepts, commands and examples in ...
[לנוסח המלא]
On the Complexity of the Regenerator Location Problem - Treewidth and Other Parameters
event speaker icon
איתמר הרטשטיין
event date icon
יום ראשון, 19.2.2012, 11:30
event location icon
טאוב 701
We deal with the Regenerator Location Problem in optical networks. We are given a network G = (V, E), and a set Q of communication requests between pairs of terminals in V. We investigate two variations: one in which we are given a routing P of the requests in Q, and one in which we are required to find also the routing. In both cases, each path in P must contain a regenerator after every ...
[לנוסח המלא]
Synthesizing Concurrent Relational Data Structures
event speaker icon
Roman Manevich
event date icon
יום שלישי, 14.2.2012, 14:30
event location icon
חדר 337-8 טאוב.
Geometric Methods for Analyzing and Monitoring Large Distributed Data
event speaker icon
גיא שגיא
event date icon
יום רביעי, 8.2.2012, 13:00
event location icon
טאוב 601
A basic requirement in many distributed systems is the ability to detect objects whose score, according to a given function, exceeds some threshold. Since an object's data can be partitioned over various nodes, computing its global score requires collecting its data over the network. A main challenge is to perform threshold queries or monitoring with minimum network communication, i.e., without collecting the data from the nodes to a central location. In this talk I will ...
[לנוסח המלא]
ceClub: Synthesizing Concurrent Relational Data Structures
event speaker icon
רומן מנביץ' (אונ' טקסס ביוסטון)
event date icon
יום רביעי, 8.2.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
Efficient concurrent data structures are extremely important for obtaining good performance for most parallel programs. However, ensuring the correctness of concurrent data structure implementations can be very tricky because of concurrency bugs such as race conditions and deadlocks. In systems that use optimistic parallel execution such as boosted transactional memory systems and the Galois system, the implementation of concurrent data structures is even more complex because data structure implementations must also detect conflicts between concurrent ...
[לנוסח המלא]
Multiparty Computation from Somewhat Homomorphic Encryption
event speaker icon
Ivan Damgaard
event date icon
יום שלישי, 7.2.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Tissue Microenvironment Magnetic Resonance Imaging (TM-MRI) of the body: A Reliable Quantitative Biomarker for Personalized Treatment Paradigms
event speaker icon
מוטי פריימן (אונ' הרוורד)
event date icon
יום שלישי, 7.2.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Personalized treatment approaches which optimize drugs doses according to pre-treatment and early response-to-therapy evaluation hold the promise to improve treatment success rates and reduce severe adverse side-effects due to drugs toxicity in variety of pathologies. Reliable assessment of tissue microenvironment including cell proliferation, density and size and tissue perfusion as a biomarker for disease activity is a key necessity for personalized, response-based treatment regimes. Histology-based tissue microenvironment analysis requires invasive, surgical procedure to obtain the ...
[לנוסח המלא]
Haifux Club: C++ AMP: Microsoft approach for Heterogeneous Computing
event speaker icon
אבי מנדלסון (מיקרוסופט ומדעי המחשב והנדסת חשמל בטכניון)
event date icon
יום שני, 6.2.2012, 18:30
event location icon
טאוב 6
C++ AMP (Accelerated Massive Parallelism) is a native programming model that contains elements that span the C++ programming language and its runtime library. The syntactic changes introduced by AMP are minimal, but additional restrictions are enforced to reflect the limitations of data parallel hardware. Data parallel algorithms are supported by the introduction of multi-dimensional array types, array operations on those types, indexing, asynchronous memory transfer, shared memory, synchronization and tiling/partitioning techniques. The language aims to ...
[לנוסח המלא]
Random Sampling Preconditioners
event speaker icon
Haim Avron SPECIAL GUEST TALK-
event date icon
יום שני, 6.2.2012, 14:30
event location icon
חדר 337-8 טאוב.
Utilizing Multiple Radio Interfaces in Wireless Networks
event speaker icon
אלכס קוגן
event date icon
יום רביעי, 1.2.2012, 11:00
event location icon
טאוב 601
Contemporary mobile devices are equipped with multiple wireless interfaces, such as WiFi, Bluetooth, WiMax, ZigBee, NFC, etc. All these technologies differ dramatically one from another in maximum transmission range, bandwidth and power demands. Among all subsystems operating inside mobile devices, wireless communication is known as being particularly power-hungry, accounting for 50-70% of the total power consumption in small handheld devices, such as smartphones, and for 10% in laptops. Given the varying characteristics of different wireless ...
[לנוסח המלא]
The Plural Architecture: Shared Memory Many-cores with Hardware Scheduling
event speaker icon
Ran Ginosar
event date icon
יום שלישי, 31.1.2012, 15:30
event location icon
חדר 337-8 טאוב.
How Your Smartphone Can Use Game-Theory to Valet-park Your Car
event speaker icon
Ouri Wolfson
event date icon
יום שלישי, 31.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Diverse M-best Solutions in MRFs
event speaker icon
גרג שחרנוביץ - TTI שיקגו
event date icon
יום שלישי, 31.1.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Much effort has been directed at algorithms for obtaining the highest probability (MAP) configuration in a probabilistic (random field) model. In many situations, one could benefit from additional solutions with high probability. Current methods for computing additional most probable configurations produce solutions that tend to be very similar to the MAP solution and each other. This is often an undesirable property. I will describe an algorithm for the M-Best Mode problem, which involves finding a ...
[לנוסח המלא]
Exploiting Morphology in Identifying Multiword Expressions from Multilingual Parallel Corpora
event speaker icon
דניאל הורוביץ
event date icon
יום רביעי, 25.1.2012, 12:30
event location icon
טאוב 601
Our research discusses multi-word expressions (MWE) such as "kick the bucket", "hot dog", "by and large", "look up, and "spill the beans". Identification of MWEs has been a hot subject of research in recent years. We present a method to identify MWEs in Hebrew using a new concept we term Language Isolation. We focus on dissecting (or "isolating") the morphological properties of words to discover potential MWEs and show that this method improves the alignment ...
[לנוסח המלא]
Theory Seminar: Coin Flipping with Constant Bias Implies One-Way Functions
event speaker icon
ערן עומרי (אונ' בר-אילן)
event date icon
יום רביעי, 25.1.2012, 12:30
event location icon
טאוב 201
It is well known (c.f., Impagliazzo and Luby [FOCS '89]) that the existence of almost all ``interesting" cryptographic applications, i,e., ones that cannot hold information theoretically, implies one-way functions. An important exception where the above implication is not known, however, is the case of coin-flipping protocols. Such protocols allow honest parties to mutually flip an unbiased coin, while guaranteeing that even a cheating (efficient) party cannot bias the output of the protocol by much. While ...
[לנוסח המלא]
Pixel Club: Visual Audio Denoising
event speaker icon
דנה שגב (הנדסת חשמל, טכניון)
event date icon
יום שלישי, 24.1.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
Audio denoising is a long studied problem, with numerous algorithms and a wide accumulated knowledge. Considering non-stationary noise (like noise in a cocktail party environment) and strong, this task becomes very difficult to handle. This paper considers such audio denoising problems, where the audio track is accompanied by a video. Furthermore, the disturbing source is generally not visible in the field of view, and its nature is unknown. Overcoming such unknown noise is different than ...
[לנוסח המלא]
Theory Seminar: A Polylogarithmic-Competitive Algorithm for the $k$-Server Problem
event speaker icon
ניב בוכבינדר (האונ' הפתוחה)
event date icon
יום רביעי, 18.1.2012, 12:30
event location icon
טאוב 201
The $k$-server problem is one of the most fundamental and extensively studied problems in online computation. Suppose there is an $n$-point metric space and $k$ servers are located at some of the points of the metric space. At each time step, an online algorithm is given a request at one of the points of the metric space, and this request is served by moving a server to the requested point (if there is no server ...
[לנוסח המלא]
ceClub: Distributed Average Consensus and Coherence in Dynamic Networks
event speaker icon
סטייסי פטרסון (הנדסת חשמל, טכניון)
event date icon
יום רביעי, 18.1.2012, 11:30
event location icon
חדר 861, בניין מאייר, הפקולטה להנדסת חשמל
In the distributed average consensus problem, each node in a network has an initial value, and the objective is for all nodes to reach consensus at the average of these values using only communication with nearby nodes. Distributed average consensus algorithms have a wide variety of applications, including distributed optimization, sensor fusion, load balancing, and autonomous vehicle formation control. This talk centers on the analysis of distributed averaging algorithms for consensus and vehicle formation control ...
[לנוסח המלא]
Vector Diffusion Maps and the Connection Laplacian
event speaker icon
Amit Singer
event date icon
יום שלישי, 17.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: The Role of Target Fixations in the Process of Recognition
event speaker icon
מיכל ג'קוב (אינטל, קב' ראייה ממוחשבת)
event date icon
יום שלישי, 17.1.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Why do we perceive some elements in a visual scene, while others remain undetected? We compared fixations on detected vs. undetected items in the Identity Search Task (Jacob & Hochstein, 2009). Using a gaze-contingent technique, we further controlled the number of fixations on the target (Jacob & Hochstein, 2010). Results show that detected targets were fixated at a greater extent, and a backward dynamics alignment revealed a bifurcation point where the differential characteristics begin. Moreover, ...
[לנוסח המלא]
Definability of Combinatorial Functions
event speaker icon
תומר קוטק
event date icon
יום רביעי, 11.1.2012, 14:30
event location icon
טאוב 601
The complexity of several prominent graph polynomials, such as the chromatic polynomial and the matching polynomial, has been studied in the literature. In 2008 Makowsky raised a conjecture which generalizes complexity results for specific graph polynomials to an infinite class of graph polynomials which include almost all of those in the literature. The conjecture states roughly that the evaluations of such graph polynomials are equivalent in terms of running-time complexity, except for a small and ...
[לנוסח המלא]
Making Computers Good Listeners
event speaker icon
Joseph Keshet
event date icon
יום רביעי, 11.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Theory Seminar: Detecting Dangerous Queries: A New Approach for Chosen Ciphertext Security
event speaker icon
ברנט ווטרס (אונ' טקסס)
event date icon
יום רביעי, 11.1.2012, 12:30
event location icon
טאוב 201
I will present a new approach for creating chosen ciphertext secure encryption. The focal point of our work is a new abstraction that we call Detectable Chosen Ciphertext Security (DCCA). Intuitively, this notion is meant to capture systems that are not necessarily chosen ciphertext attack (CCA) secure, but where we can detect whether a certain query CT can be useful for decrypting (or distinguishing) a challenge ciphertext CT*. We show how to build chosen ciphertext ...
[לנוסח המלא]
ceClub: Persistent OSPF Attacks
event speaker icon
גבי נקבלי (המרכז הלאומי לסימולציה ומחקר מערכות ל"א)
event date icon
יום רביעי, 11.1.2012, 11:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
Open Shortest Path First (OSPF) is the most popular interior gateway routing protocol on the Internet. Most known OSPF attacks that have been published in the past are based on falsifying the link state advertisement (LSA) of an attacker-controlled router. These attacks can only falsify a small portion of the routing domain's topology, hence their effect is usually limited. More powerful attacks are the ones that affect LSAs of other routers not controlled by the ...
[לנוסח המלא]
Missing Heritability: New algorithmic and statistical approaches
event speaker icon
Or Zuk
event date icon
יום שלישי, 10.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Pixel Club: Pose Estimation and Recognition using Specular Highlights
event speaker icon
מרגריטה אוסדשי (אונ' חיפה)
event date icon
יום שלישי, 10.1.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
We presents a novel approach to pose estimation and model-based recognition of specular objects in difficult viewing conditions, such as low illumination, cluttered background, and large highlights and shadows that appear on the object of interest. In such challenging conditions conventional features are unreliable. We show that under the assumption of a dominant light source, specular highlights produced by a known object can be used to establish correspondence between its image and the 3D model, ...
[לנוסח המלא]
מקף חטף פתח – פריסת המקלדת העברית התקנית החדשה
event speaker icon
אמיר א' אהרוני
event date icon
יום שני, 9.1.2012, 18:30
event location icon
טאוב 6
בשנתיים האחרונות עבדה ועדה במכון התקנים, ביזמתי ובהשתתפותי הפעילה, על שינוי לפריסת המקלדת העברית. למה רציתי לשנות את פריסת המקלדת? למה דווקא דרך מכון התקנים? איך גורמים לאנשים שמייצגים את מיקרוסופט, את לינוקס ואת אפל להסכים במחלוקות? איך עורכים פריסת מקלדת בלינוקס ובחלונות? איך מתקינים פריסת מקלדת חדשה ואיך מפיצים אותה להמון אנשים?
[לנוסח המלא]
Efficient and Exact Inter-Sentence Decoding for Natural Language Processing
event speaker icon
Roi Reichart
event date icon
יום שני, 9.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Fast Distributed Computing Despite Poor Connectivity
event speaker icon
Keren Censor-Hillel
event date icon
יום ראשון, 8.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
Theory Seminar: Subspace Evasive Sets
event speaker icon
זאב דביר (פרינסטון)
event date icon
יום חמישי, 5.1.2012, 12:30
event location icon
טאוב 601
We describe an explicit, simple, construction of large subsets of F^n, where F is a finite field, that have small intersection with every k-dimensional affine subspace. Interest in the explicit construction of such sets, termed 'subspace-evasive' sets, started in the work of Pudlak and Rodl (2004) who showed how such constructions over the binary field can be used to construct explicit Ramsey graphs. More recently, Guruswami (2011) showed that, over large finite fields (of size ...
[לנוסח המלא]
Algorithmic cooling of spins using optimal control
event speaker icon
יוסי עטיה
event date icon
יום רביעי, 4.1.2012, 13:30
event location icon
טאוב 601
Nuclear magnetic resonance (NMR) has proven to be a leading implementation of quantum information processors where each molecule in the sample constitutes a register of quantum bits (qubits). However, at room temperature, the qubits that are realized by nuclear spins (1/2) are in a highly mixed state: noisy or with high entropy. Source coding (compression) can cool some spins (reducing their Shannon entropy) while heating others, yet this closed-system technique is limited by Shannon's entropy ...
[לנוסח המלא]
Theory Seminar: Homomorphic Encryption: from Private-Key to Public-Key
event speaker icon
רון רוטבלום (מכון ויצמן למדע
event date icon
יום רביעי, 4.1.2012, 12:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
We show how to transform any additively homomorphic private-key encryption scheme that is compact, into a public-key encryption scheme. By compact we mean that the length of a homomorphically generated encryption is independent of the number of ciphertexts from which it was created. We do not require anything else on the distribution of homomorphically generated encryptions (in particular, we do not require them to be distributed like real ciphertexts). Our resulting public-key scheme is homomorphic ...
[לנוסח המלא]
ceClub: Graph Matching and Clustering on the GPU
event speaker icon
רוב ביזלינג (אונ' אוטרכט)
event date icon
יום רביעי, 4.1.2012, 11:30
event location icon
טאוב 9
Graph matching is the problem of matching nodes of a graph in pairs such that the largest number of pairs is created or the largest sum of edge weights is obtained. Greedy graph matching provides us with a fast way to coarsen a given graph during graph partitioning. Direct algorithms on the CPU which perform such greedy matchings are simple and fast, but offer few handholds for parallelisation. To remedy this, we introduce a fine-grained ...
[לנוסח המלא]
The complexity of counting constraint satisfaction problem
event speaker icon
Andrei Bulatov
event date icon
יום שלישי, 3.1.2012, 14:30
event location icon
חדר 337-8 טאוב.
ceClub: Load Balancing for SIP Server Clusters
event speaker icon
אריך נחום - IBM T.J.
event date icon
יום שלישי, 3.1.2012, 12:45
event location icon
חדר 337, בניין טאוב למדעי המחשב
The Session Initiation Protocol (SIP) is widely used for controlling communication sessions such as voice and video calls over IP, video conferencing, streaming multimedia distribution, instant messaging, presence information, file transfer and online games. This work introduces several novel load balancing algorithms for distributing SIP requests to a cluster of SIP servers. Our load balancer improves both throughput and response time versus a single node, while exposing a single interface to external clients. We present ...
[לנוסח המלא]
Pixel Club: Contour-Based Joint Clustering of Multiple Segmentations
event speaker icon
דניאל גלזנר (מכון ויצמן למדע)
event date icon
יום שלישי, 3.1.2012, 11:30
event location icon
חדר 1061, בניין מאייר, הפקולטה להנדסת חשמל
We present an unsupervised, shape-based method for joint clustering of multiple image segmentations. Given two or more closely-related images, such as close frames in a video sequence or images of the same scene taken under different lighting conditions, our method generates a joint segmentation of the images. We introduce a novel contour-based representation that allows us to cast the shape-based joint clustering problem as a quadratic semi-assignment problem. Our score function is additive. We use ...
[לנוסח המלא]
Haifux Club: GPGPU - Case studies, Do's and Dont's (Part 4 out of 4 talks series)
event speaker icon
עופר רוזנברג ויקי טבקה - AMD
event date icon
יום שני, 2.1.2012, 18:30
event location icon
חדר 337, בניין טאוב למדעי המחשב
This is a 4 series of 4 talks about GPGPUS, intended for the practical engineer: 1. Motivation, AMD's architecture 2. OpenCL 3.Case studies, Dos and Don'ts 4.Tools and Profiling for Performance General Purpose GPU programming became a hot topic in the last few years, ranging from academic studies to being used by commercial software products. As an example, three out of the world's top10 supercomputers (June2011 list) contain GPUs in them. This series of lectures ...
[לנוסח המלא]
Semantic Model Differencing for Software Evolution
event speaker icon
Shahar Maoz
event date icon
יום ראשון, 1.1.2012, 14:30
event location icon
חדר 337-8 טאוב.