הפקולטה להנדסה ע"ש איבי ואלדר פליישמן

EE Seminar: Generalized Neyman-Pearson for Multiple Detections

07 בינואר 2019, 15:00

חדר 011, בניין כיתות-חשמל

(The talk will be given in English)

Speaker: Dr. Amichai Painsky
HUJI & MIT

Monday, January 7^th, 2019
15:00 - 16:00

Room 011, Kitot Bldg., Faculty of Engineering

Generalized Neyman-Pearson for Multiple Detections

Abstract

The classical single hypothesis testing problem considers a set of observations that is drawn from one of two possible distributions, typically denoted as the Null (no signal) and the Alternative (signal). The goal of the test is to maximize the power (correct detection) subject to a prescribed probability of false alarm (false detection). It is well-known that the Neyman-Pearson procedure provides the uniformly most powerful test for the single hypothesis case. However, the problem becomes more complicated when we consider more than two hypotheses. In this work, we formulate the multiple testing problem as an infinite-dimensional optimization problem, seeking the most powerful decision policy under commonly used false detection measures (such as family-wise error rate (FWER) and false discovery rate (FDR)). In this sense, our approach is a generalization of the optimal Neyman-Pearson procedure for testing multiple hypotheses. Using calculus of variations, we show that for exchangeable hypotheses, our problem can be reformulated as infinite linear programs and can be solved for any number of hypotheses, by applying the derived optimality conditions. We demonstrate our results in several setups and show that the power gain over natural competitors is substantial in all the examined settings. Finally, we discuss several engineering applications, from classical communications systems, to more recent sensing devices in autonomous car.

Short Bio

Amichai Painsky is a Post-Doctoral Fellow, co-affiliated with the Israeli Center for Research Excellence in Algorithms (I-CORE ALGO) at the Hebrew University, and the Signals, Information and Algorithms (SIA) Laboratory at MIT. Amichai received his B.Sc. in Electrical Engineering from Tel Aviv University (2007), his M.Eng. in Electrical Engineering from Princeton University (2009) and his Ph.D. in Statistics from Tel Aviv University (2016). He is a recipient an outstanding Ph.D. students award from the school of Mathematical Sciences, the Weinstein Institute of Signal Processing and the Marejn Foundation. Previously, he received a Brain Return Ph.D. Scholarship from the Israeli Center for Returning Scientists.

כנס הנדסה ביורפואית ISMBE 2019

25 בפברואר 2018, 8:00

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Komissarov Rony

19 בדצמבר 2018, 11:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Komissarov Rony

סמינר רוני

You are invited to attend a department seminar on

Partially Coherent Radar

:By

Komissarov Rony

MSc student under the supervision of Dr. Pavel Ginzburg

Abstract

It is widely believed that range resolution, the ability to distinguish between two closely situated targets, depends inversely on the bandwidth of the transmitted radar signal. In this seminar, I will present a novel type of ranging system with controllable coherence length of radiation, which possesses superior range resolution that is almost completely free of bandwidth limitations. By sweeping over the coherence length of the transmitted signal, the novel partially coherent radar is experimentally shown to resolve targets at distances that are two orders of magnitude below what standard coherent radars could achieve with the same bandwidth. This concept offers solutions to problems whereby high range resolution and accuracy are necessary but available bandwidth is limited, as is the case for the autonomous car industry, optical imaging, and astronomy to name just few.

On Wednesday, December 19, 2018, 11:00

Room 206, Wolfson Building

School of Mechanical Engineering Yoav Green

07 בינואר 2019, 14:00 - 15:00

בניין וולפסון חדר 206

School of Mechanical Engineering Yoav Green

School of Mechanical Engineering Seminar
Monday, March 12, 2018 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

The Fluid Dynamics of Nanochannels and Biological Systems

Yoav Green

Post doc guest of Touvia Miloh

Nanochannels and nanopores are ubiquitous to nature and technology. They can be found in macroscopically large permselective membranes such as those used for desalination in electrodialysis systems, or small system such as cell membranes. The sub-micron scale in such systems allows them not only to desalinate water, harvest energy, and serve as highly sensitive bio-molecular detectors, but it also allows these nanochannels to behave as diode-like current rectifiers.

In nanofluidics systems, a nanochannel is typically connected to much larger microchannels/reservoirs. Until recently, in the nanofluidics community it was assumed that the effects of the microchannels is negligible. In this talk, I will present contradicting evidence to this assumption. I will then present a new modified paradigm which emphasizes the importance of the microchannels themselves as well as the microchannel-nanochannel interfaces. These new insights are extremely useful for designing new nanofluidic based systems.

To conclude, I will present my recent research in biomechanics that focuses on relating the kinematics of an epithelial monolayer of cells to its kinetics. As the epithelial monolayer migrates collectively, each constituent cell exerts intercellular stresses on neighboring cells and exerts traction forces on its substrate. The relationship between the velocities, stresses and tractions is fundamental to collective cell migration but it remains unknown. It will be shown that the observed dynamics does not conform to the simple and commonly assumed laws of a linear Hookean solid or Newtonian fluid. Rather the mechanics are much more complicated and likely because of the active nature of the cells. These findings are crucial for developing a deeper understanding of collective cellular behavior.

Yoav Green is currently a post-doctoral researcher in the Harvard T. H. Chan School of Public Health where he is working in the field of biomechanics. Before that Yoav received his PhD in mechanical engineering from the Technion - Israel Institute of Technology where his research fields were nanofluidics and electrokinetics. Yoav also holds a MSc in physics (astrophysics and astronomy) from the Weizmann Institute of Science, and BSc in aerospace engineering from the Technion.

School of Mechanical Engineering Roman Golkov

17 בדצמבר 2018, 14:00 - 15:00

בניין וולפסון חדר 206

School of Mechanical Engineering Roman Golkov

SCHOOL OF MECHANICAL ENGINEERING SEMINAR Monday, December 17, 2018 at 14.00 Wolfson Building of Mechanical Engineering, Room 206

Active Elastic Interactions between Living Cells

Roman Golkov

Ph.D. student of Prof. Yair Shokef

Live cells apply mechanical forces on their environment and sense and respond to the forces created by neighboring cells. The elasticity of the extra-cellular matrix can alter these forces and subsequently the cell’s biological behavior. For example, experiments with pairs of cells plated on synthetic substrates show that cells behavior changes from attractive to repulsive due to changes in the rigidity of the substrate. We theoretically analyze the mechanical interaction between distant cells, with the goal to deduce the biological regulatory mechanisms of cells from their mechanical and geometrical behavior.

We first consider a model of spherical force dipoles, i.e. spherical cells surrounded by a three-dimensional infinite elastic medium that apply radial forces on their environment. We distinguish between ‘dead’ behavior, in which the force dipoles apply fixed external forces and self-displacements and ‘live’ behavior, in which the forces and self-displacements applied change in response to changes that the force dipoles sense in their environment. We compare four different regulatory behaviors, in which the force dipoles preserve their spherical shape and in addition volume, position, both or neither. We identify an interaction energy, which does not exist in the absence of this regulation, and identify which regulatory ingredients govern the sign and which the magnitude of this interaction.

Subsequently, we model cells as disc force dipoles adhered to the top of a semi-infinite elastic medium, and study the effect of the anisotropy of their active contractile forces. We find the quantitative decay of interaction energy with cell-cell distance, and demonstrate how the relative phase angles of their contractility anisotropy can invert the sign of their interaction from repulsive to attractive.

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Mihael Fugenfirov

18 בדצמבר 2018, 13:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Mihael Fugenfirov

סמינר מיכאל

You are invited to attend a department seminar on

Incremental Solidification (3D-Printing) of Magnetically-Confined Metal-Powder by Localized Microwave Heating

:By

Mihael Fugenfirov

MSc student under the supervision of Prof. Eli Jerby

Abstract

This seminar presents an experimental and theoretical study oriented to investigate the potential utilization of the localized microwave-heating (LMH) effect in 3D-printing and additive-manufacturing (AM) processes. The phenomenon of intentional LMH is made possible by the thermal runaway instability. It enables an intentional rapid heating within a localized zone (namely a hotspot). Following our previous LMH-AM study, a magnetic confinement technique is developed here as a non-contact support for the incremental solidification of small metal-powder batches by LMH. Various experimental schemes were investigated in this work. Among them, one scheme has been selected for a more in-depth research. The process and the products of the experimental setup are presented, as well as future possibilities

On Tuesday, December 18, 2018, 13:00

Room 011, EE-Class Building

הרצאת אורח עם מנכ"ל ומייסד משותף של vayyar: רביב מלמד

החיישן שרואה מבעד לעצמים וקירות

12 בדצמבר 2018, 16:00 - 19:00

הפקולטה להנדסה אוניברסיטת תל-אביב

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Itamar Levi

11 בדצמבר 2018, 15:00

פקולטה להנדסה, ביניין כיתות, חדר 011

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Itamar Levi

סמינר איתמר

Physical Security - on the vulnerability of crypto. algorithms, architectures and platforms

:By

Itamar Levi

The Crypto-group & the Electronics Systems and Circuits (ECS) group.

Université Catholique de Louvain (UCLouvain), Belgium.

Abstract

The integration of billions (soon trillions) of wireless sensing, computing and communicating nodes in a so-called “Internet of Things” is a reality which considerably affect our lives. Whereas it brings breakthrough opportunities for a wide range of applications (e.g. automotive, smart grids/cities, medical implants and industrial cyber-physical systems), it serves as a concrete challenge for security, integrity and privacy. Perhaps the most challenging aspect relates to the physical-security of these devices due to their physical exposure and accessibility. Moreover, the cost of securing these devices, to-date, is simply too high for their specifications (i.e. low energy, small area, large range of activity-factor). This talk will start with discussing limitations of state-of-the-art “consensus” approaches to protect against physical attacks by adversaries which utilize side-channels (e.g. masking by secret-sharing). For example, it will be demonstrated how an adversary which is aware to the physical aspects of the devices (electronics, architecture etc.) can easily crumble the theoretical security promises of such constructions. Then, it will be shown how a close interaction between crypto. algorithms, architectures and platforms (uCs, FPGAs and ASICs) can foster considerable security- and performance-improvement of countermeasures and novelty. Finally, we discuss the most alarming class of threats, i.e. devices tempering, EM attacks and faults injection. We briefly demonstrate a unique ASIC device which was designed in the architectural level with a clear target: to resist such attacks and limit the amount of information an adversary can extract from our devices.

On Tuesday, Dec 11, 2018, 15:00

Room 011, Kitot building

סמינר מחלקתי אלקטרוניקה פיזיקאלית : Dr. Richard Al Hadi

10 בדצמבר 2018, 13:00

סמינר ריצרד

Sub-mm-Wave (300-600GHz) Silicon Based Source Array

:By

Dr. Richard Al Hadi

University of California, Los Angeles, CA 90095

This talk presents the design and implementation of a sub-mm-Wave fully integrated signal generator array. It is based on a harmonic oscillator designed in a standard 65-nm digital CMOS technology. The talk will cover the design methodology, the electromagnetic modeling and simulations. The harmonic oscillator concept is further elaborated to build a unique beamforming technique called Y-vector network. This approach has been recently developed by the High-Speed Electronics Laboratory (HSEL) at UCLA. It will be also presented. This beamforming technique features minimized chip area and DC power consumption. It requires no traditional adjustable phase shifter at multi-channel front end which usually suffer from high insertion loss at these frequencies. A compact 1x4 Beam Steering Phased Array (BSPA) is validated at 0.55THz with about ±30° steering angle range.

Bio

Dr. Richard Al Hadi received the engineering diploma from Caen's National Graduate School of Engineering in Electronics and Applied Physics and the master’s degree from the University of Caen Basse-Normandie, France, in 2009. He received the Ph.D. degree, suma cum lauda, from the University of Wuppertal, Germany, in 2014. In 2011 he worked as a research fellow at Korea University, Seoul, South-Korea. Dr. Al Hadi has joined University of California, Los Angeles (UCLA) in 2015 as a postdoctoral fellow. His research interests are terahertz integrated circuits in silicon technologies. Dr. Al Hadi is senior IEEE member, he is a co-recipient of the 2012 Jan Van Vessem Award for the Outstanding European Paper at the IEEE International Solid-State Circuit Conference and the 2014 EuCAP best paper award.

On Monday, Dec 10th, 2018, 13:00

Room 011, Kitot building

עמודים