סמינר מחלקתי

27 בינואר 2015, 14:00 
חדר 206 בניין וולפסון  
סמינר מחלקתי

 

Online Social Networks Security and Privacy

 

Dr. Michael Fire – Ben-Gurion University

 

 

 

Abstract:

 

Many online social network (OSN) users are unaware of the numerous security risks that exist in these networks, including privacy violations, identity theft, and sexual harassment, just to name a few. According to recent studies, OSN users readily expose personal and private details about themselves, such as relationship status, 

date of birth, school name, email address, phone number, and even home address. This information, if put into the wrong hands, can be used to harm users both in the virtual world and in the real world. These risks become even more severe when the users are children. 

 

In this talk, we will present a thorough review of the different security and privacy risks which threaten the well-being of OSN users in general, and children in particular. In addition, we will present an overview of existing solutions that can provide better protection, security, and privacy for OSN users. 

 

Bio:

 

Dr. Michael Fire is currently a postdoctoral fellow at the Information System Engineering Department, Ben-Gurion University of the Negev. He holds an MSc in Mathematics from the Bar-Ilan University and a PhD in Information System Engineering from the Ben-Gurion University. For excellence in his PhD studies, he won the Kreitman Prize. He has published dozens of papers for prestigious conferences and journals in the fields of social networks security and privacy and data science. He also has extensive experience as a data scientist working for several companies and organizations. 

 

 

ההרצאה תתקיים ביום שלישי 27.1.15, בשעה 14:00 בחדר 206, בנין וולפסון הנדסה, הפקולטה להנדסה, אוניברסיטת תל-אביב.

 

מכיפת ברזל לכיפת הסייבר התמודדות עם אתגרי המחר

מועדון שילובים מזמינך להרצאה חדשה ומעניינת

של בוגר הפקולטה תא"ל (מיל.) ד"ר דניאל גולד

מכיפת ברזל לכיפת הסייבר- התמודדות עם אתגרי המחר

04/02/2015 יום רביעי, בין 18:30-20:45

וולפסון להנדסה מכנית, חדר 206, אוניברסיטת תל אביב

להרשמה לחץ כאן

04 בפברואר 2015, 18:30 
וולפסון להנדסה מכנית, חדר 206, אוניברסיטת תל אביב  
מכיפת ברזל לכיפת הסייבר התמודדות עם אתגרי המחר

רקע להרצאה

דניאל גולד מביא בהרצאתו הצגה חדשנית וייחודית המתארת קונספט להגנת סייבר כוללת, תוך כדי אינטגרציה של קונספטים, טכנולוגיות ורעיונות בין תחומיים. בעיקר מתחומי הלוחמה האלקטרונית וההגנה בפני רקטות וטילים, התמודדות עם אתגרי המחר.

 על המרצה :

תא"ל (מיל. ) ד"ר דניאל גולד, הינו בוגר הפקולטה להנדסה באוניברסיטת ת"א. מנכ"ל ומייסד "גולד טכנולוגיה מו"פ ויזמות בע"מ", אבי "כיפת ברזל", לשעבר ראש המחקר והפיתוח בצה"ל ומשהב"ט, יו"ר הועדה הלאומית למחקר והפיתוח של הסייבר האזרחי. כיהן כר. מו"פ (מחקר ופיתוח) במפא"ת (המנהל לפיתוח אמצעי לחימה ותשתיות טכנולוגיות) ולפני כן במגוון תפקידי מחקר ופיתוח במפא"ת ובחיל האוויר. יזם וניהל את פיתוח מערכת "כיפת ברזל" להגנה בפני טילים ועל כך זכה בפרס ביטחון ישראל לשנת 2012. בהנהגתו, יחידת המו"פ זכתה ב- 7 פרסי בטחון ישראל.

EE Seminar: Dr. Eitan Bachmat (BGU)

~~(The talk will be given in English)

Dr. Eitan Bachmat
Department of Computer Science, Ben Gurion University
Monday, April 20th, 2015
15:00 - 16:00
Room 011, Kitot Bldg., Faculty of Engineering

From scheduling of I/O in disk drives to airplane boarding and back to flash drive codin

Abstract
We show how the problems of optimally scheduling I/O in disk drives, analysis of aiplane borading strategies and optimizing certain WOM lattice codes can all be understood in  terms of concentric "circles" ! in various space-time geometry domains.
If time permits, I will try to convince you that the orbit of the earth around the sun is uniformly random (god plays a lot of dice), show how to make slow passengers invisible to the airplane boarding process
(naturally using optics) and how Fermat's last theorem! is related to express lines in the supermarket and to certain boarding policies.

20 באפריל 2015, 15:00 
חדר 011, בניין כיתות-חשמל  

EE Seminar: Dr. Ran Gelles (Princeton University)

~~(The talk will be given in English)

Dr. Ran Gelles
Department of Computer Science, Princeton University
Monday, January 26th, 2015
15:00 - 16:00
Room 011, Kitot Bldg., Faculty of Engineering

Interactive communication over channels with feedback and erasure channels: Capacity and Maximal noise resilience
Abstract
We consider coding protocols for interactive communication performed over two simple types of noisy channels: binary error channels with noiseless feedback and binary erasure channels. In both cases, the noise model is adversarial, where we assume at most \eps-fraction of the bits can be corrupted.
Our first result deals with the maximal rate obtainable by such coding schemes. Specifically, we give simple randomized, efficient protocols that achieve a rate of 1-O(H(\eps)) for both channel types. Such a rate is optimal for feedback channels and is conjectured to be optimal for erasure channels as well.
Next we consider the maximal noise that interactive protocols can withstand when communication is done over the above two channels (assuming some positive rate). For feedback channels, we show a tight upper and lower bounds: when the “order of speaking” is fixed (say, alternating), the bound on the noise is 1/6 in the binary case and 1/4 if parties are allowed to send symbols from a larger alphabet. When the “order of speaking” is not predetermined, the maximal noise becomes 1/3, regardless of the alphabet size of the channel.
For erasure channels with a large alphabet, we provide a protocol that matches the optimal tolerable erasure rate of 1/2 (Franklin et al., CRYPTO ’13) but operates in a much simpler and more efficient way. Translating this protocol to the case of a binary erasure channels yields a protocol that withstands at most 1/3 fraction of erasures.  Our protocols are simple, deterministic and computationally efficient.

Based on joint works (SODA’15,ITCS’15) with Klim Efremenko and Bernhard Haeupler

26 בינואר 2015, 15:00 
חדר 011, בניין כיתות-חשמל  

22.1.15

22 בינואר 2015, 15:00 
Kitot 011  

Physical Electronics Dept.

 

You are invited to attend a lecture by:

 

Prof. Ronen Rapaport

The Racah Inst. of Physics & the Department of Applied Physics
The Center of Nanoscience and Nanotechnology

The Hebrew University of Jerusalem

 

 

On the subject:

 

Nanocrystals on nanolenses: Towards an efficient single photon source at room temperature

 

 

Efficient and deterministic single photon emitter devices are an essential resource for quantum cryptography and quantum information transfer. The main challenges are the ability to collect all the photons from the emitter and to reduce the uncertainty in the photon emission time by reducing its emission lifetime.  Of course it would be desired to have such device working at room temperature.

I will review our recent work in which we couple semiconductor nanocrystals, which are single photon emitters, to flat metallic and hybrid metal-dielectric lenses and achieve efficient directional emission of photons, by coupling to either the plasmonic or waveguided optical modes of the antenna.

 

Thursday, 22 January 2015 at 15:00

Room 011, Kitot Build.

 

סמינר מחלקתי

22 בינואר 2015, 14:00 
חדר 206 בניין וולפסון  

Analyzing Human Mobility Patterns with Zero-Knowledge Routine Diaries

Gabriella Cohen – M.Sc. student

Abstract:

 

Mobile devices have become an integral part of day-to-day life. Since most devices have location positioning technology such as GPS or cellular positioning, a large amount of location data is obtained per user, which generates a continuous and frequent location-sampling of a user. When aggregated together the location data can be used to draw a detailed trajectory of a user: movement patterns, locations visited and the times of the visits.

 

Human Mobility Patterns hold a tremendous amount of inferred information regarding a user's daily routine, their socioeconomic status, life style, gender, family status, occupation, hobbies etc. Characterizing users using their typical movement patterns can be of great value for many applications, such as marketing and advertising, forecasting the dynamics of crowds, infrastructure and transportation planning, traffic control, smart-home, and social applications.

 

In this talk I will present and end-to-end model for extracting single-user mobility patterns, both geographic and inferred-semantic routines. I then use all single-users' trajectories to extract mobility pattern clusters and characterize the profile of users that belong to each cluster. Using cellular raw data of 5,000 anonymous users, and no other source of data nor external information, the model identifies both geographical clusters and inferred-semantic clusters of Human Mobility Patterns.

 

This work was performed under the supervision of Prof. Irad Ben-Gal and Dr. Eran Toch.

 

ההרצאה תתקיים ביום חמישי 22.1.15, בשעה 14:00 בחדר 206, בנין וולפסון הנדסה, הפקולטה להנדסה, אוניברסיטת תל-אביב.

סמינר המחלקה להנדסה ביו רפואית

18 בינואר 2015, 14:15 
הבניין הרב תחומי , חדר 315  

דר' יעל יניב

The clocks that make our heart tick

 

Cells within the sinoatrial node, the heart’s pacemaker, generate

 

spontaneous action potentials (APs) that are conducted to the ventricle

 

and excite ventricular myocyte contraction.

 

For several decades, the prevailing viewpoint on the heart’s pacemaker

 

activity has related heart rate and rhythm only to the surface membrane,

 

suggesting that activity is driven only by voltage-and time-dependent ion

 

channels (membrane clock). My recent experimental studies, however,

 

have shown discovered that the pacemaker membrane clock is tightly

 

coupled to the intracellular dynamics on a beat-to-beat basis. Moreover,

 

the mitochondria dynamically buffer cytosolic affecting the sarcoplasmic

 

reticulum load. The change in sarcoplasmic reticulum load translates into

 

change in the AP firing rate.

 

In my talk, I will present bioenergetics and systems biology perspectives

 

of the new coupled-clock pacemaker paradigm.

 

 

 

 

סמינר מחלקתי Limor Nizri

10 ביוני 2015, 15:00 
206  
סמינר מחלקתי Limor Nizri

 

 

 

 

 

 

School of Mechanical Engineering Seminar
Wednesday, June 10, 2015 at 15:00
Wolfson Building of Mechanical Engineering, Room 206

 

 

A molecular method for testing the effectiveness of UV systems on-site

 

Limor Nizri

M.Sc Student of Dr. Hadas Mamane

 

Ultraviolet (UV) disinfection is a barrier to possible contamination of groundwater pollution.  The well-water is drawn and treated with UV to meet the Israeli and internationally accepted standards, for protective radius of well water. Activity in the protective radius of well-water may result in microbial contamination and include sewage lines, barns, landfills, wastewater treatment plants, industrial zone and irrigation with wastewater effluent. Due to filtration of water through the soil, groundwater contains a low concentration of bacteria. Enumerating the bacterial concentration in water via the standard method of ”plate count enumeration” can only quantify bacteria that exist in water and are culturable on nutrient media.
Consequently, it is not possible to examine the effectiveness of UV disinfection of well-water operating in the field via standard culturing methods due to the insufficient concentration of indicator bacteria in the raw water, as determined by conventional methods. In this study, we examined the feasibly of a molecular method for determining the efficacy of UV disinfection systems operating on-site. We have developed a method of using the total DNA from a full array of bacterial species in the water sample without any need of growing or isolating a specific type of bacteria, and succeeded to correlate the total DNA of bacteria to the UV dose in the lab (spiked) in buffered water and in natural well-water without growing or isolating a specific type of bacteria. The "DNA damage" can bridge the gap for water without bacterial counts and may be used to validate the efficacy of full commercial-scale systems. Developing methods for evaluating UV disinfection on-site may serve as the stepping stone for wide acceptance of UV disinfection, especially in such waters.

 

 

 

 

 

סמינר מחלקתי

13 בינואר 2015, 14:00 
 
סמינר מחלקתי

Bootstrapping Semantic Locations from Human Mobility Data

Omer Barak –M.Sc.student

Abstract:

In recent years, the prevalence of mobile phones fitted with GPS and other positioning technologies has made people's exact location in space and time an accessible piece of data. The process of transforming the physical location (e.g. <32.156, 34.69>) of such a mobile user into a semantic location (e.g. "Home" or "Work") is called Semantic Labeling. This semantic representation has numerous advantages: it allows easier discovery of mobility patterns, regardless of the user's geographical setting; it enables straightforward comparison between users; and it does not expose the physical location of private places such as the user's home.

 

In this talk I will present a simple model for human mobility and a framework for semantic labeling based on that model. The framework uses supervised learning and utilizes spatial, temporal and contextual data. We refer to this process as "bootstrapping" semantic locations since the input data the framework uses is only the time-stamped physical locations, without any a-priori knowledge of the user itself: habits, demographic features, social group and so on. I will discuss the experiments used to evaluate this framework and will present two sample applications of it: for privacy-preserving dataset release and for measuring user similarity.

 

This work was performed under the supervision of Dr. Eran Toch.

 

ההרצאה תתקיים ביום שלישי 13.1.15, בשעה 14:00 בחדר 206, בנין וולפסון הנדסה, הפקולטה להנדסה, אוניברסיטת תל-אביב.

 

סמינר מחלקתי

20 בינואר 2015, 14:00 
חדר 206 בניין וולפסון  
סמינר מחלקתי

 

Online Stochastic Optimization with a Moving Target 

Prof. Assaf Zeevi

 

 Abstract :

Stochastic approximation refers to a family of methods whose objective is to  sequentially estimate the optimum point of a fixed yet unknown cost function whose observations are confounded by statistical noise. Since its inception in the 1950's, the method has been the subject of a voluminous literature and is widely used in a variety of application settings.  In this talk we will  develop some theory that attempts to expand the scope of stochastic approximation to non-stationary environments, i.e., when the cost function is allowed to change over time. Some (hopefully interesting) connections will be drawn to a recent strand of literature on online convex optimization, which studies the aforementioned  problem in a so-called adversarial setting.

Joint work with Omar Besbes, Columbia University, and Yoni Gur, Stanford University. 

ההרצאה תתקיים ביום שלישי 20.1.15, בשעה 14:00 בחדר 206, בנין וולפסון הנדסה, הפקולטה להנדסה, אוניברסיטת תל-אביב.

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