ESE Colloquia & Events

Fall 2015-Spring 2016

ESE colloquia are held on Tuesdays from 11-12:00pm in Towne 337, unless otherwise noted. For all Penn Engineering events, visit the Penn Calendar.

To be added to the ESE Events mailing list (which sends notifications regarding all departmental colloquia, seminars, and events) please email us at ESEevents@seas.upenn.edu.

Spring 2016

Keren Bergman Tuesday, January 26
Alfred Hero
University of Michigan
Graph Continuum Limits in Data Science
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Abstract: Many problems in data science fields including data mining, computer vision, and machine learning involve combinatorial optimization over a graphs, e.g., minimal spanning trees, traveling salesman tours, or k-point minimal graphs over a feature space.  Certain properties of minimal graphs like their length, minimal paths, or span have continuum limits  as the number of nodes approaches infinity. These include problems  arising in spectral clustering, statistical classification, multi-objective learning, and anomaly detection. In some cases these continuum limits lead to analytical approximations that can  break the combinatorial bottleneck.  In this talk, I will present an overview of some of the remarkable theory of graph continuum limits and illustrate with data science applications.

Bio: Alfred O. Hero III received the B.S. (summa cum laude) from Boston University (1980) and the Ph.D from Princeton University (1984), both in Electrical Engineering. Since 1984 he has been with the University of Michigan, Ann Arbor, where he is the R. Jamison and Betty Williams Professor of Engineering and co-director of the Michigan Institute for Data Science (MIDAS) . His primary appointment is in the Department of Electrical Engineering and Computer Science and he also has appointments, by courtesy, in the Department of Biomedical Engineering and the Department of Statistics. From 2008-2013 he held the Digiteo Chaire d'Excellence at the Ecole Superieure d'Electricite, Gif-sur-Yvette, France. He is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE) and several of his research articles have received best paper awards. Alfred Hero was awarded the University of Michigan Distinguished Faculty Achievement Award (2011). He received the IEEE Signal Processing Society Meritorious Service Award (1998), the IEEE Third Millenium Medal (2000), and the IEEE Signal Processing Society Technical Achievement Award (2014). Alfred Hero was President of the IEEE Signal Processing Society (2006-2008) and was on the Board of Directors of the IEEE (2009-2011) where he served as Director of Division IX (Signals and Applications). He served on the IEEE TAB Nominations and Appointments Committee (2012-2014). Alfred Hero is currently a member of the Big Data Special Interest Group (SIG) of the IEEE Signal Processing Society. Since 2011 he has been a member of the Committee on Applied and Theoretical Statistics (CATS) of the US National Academies of Science.

Alfred Hero's recent research interests are in the data science of high dimensional spatio-temporal data, statistical signal processing, and machine learning. Of particular interest are applications to networks, including social networks, multi-modal sensing and tracking, database indexing and retrieval, imaging, biomedical signal processing, and biomolecular signal processing.

Keren Bergman

Thursday, February 4
Prineha Narang
Caltech
11am, Moore 216
Light-matter interactions at the nanoscale: A nonequilibrium approach

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Abstract:In this talk I will discuss a theory-driven approach, closely coupled with ultrafast spectroscopy and nanofabrication, aimed at the discovery of active optoelectronic materials and nanophotonic devices.

Surface plasmons, electromagnetic modes confined to the surface of a conductor-dielectric interface, have sparked recent interest because of their quantum nature and their broad range of applications. Despite more than a decade of intensive scientific exploration, new plasmonic phenomena continue to be discovered, including quantum interference of plasmons, observation of quantum coupling of plasmons to single particle excitations, and quantum confinement of plasmons in single-nm scale plasmonic particles. Simultaneously, plasmonic structures find widening applications in integrated nanophotonics, biosensing, photovoltaic devices, single photon transistors and single molecule spectroscopy. Decay of surface plasmons to hot carriers is a new direction that has attracted considerable fundamental and application interest, yet a detailed understanding of ultrafast plasmon decay processes and the underlying microscopic mechanisms remain incomplete.

In this talk I will provide a fundamental understanding of plasmon-driven hot carrier generation and relaxation dynamics in the ultrafast regime. I will report the first ab initio calculations of phonon-assisted optical excitations in metals as well as calculations of energy-dependent lifetimes and mean free paths of hot carriers, accounting for electron-electron and electron-phonon scattering, lending insight towards transport of plasmonically-generated carriers at the nanoscale. To conclude the first part of my talk, I will discuss recent experimental observations of the injection of these nonequilibrium carriers into molecules tethered to the metal surface and into wide bandgap nitride semiconductors.

In the second part of my talk I will present theory-directed design of Zn-IV nitride materials. The commercial prominence in the optoelectronics industry of tunable semiconductor alloy materials based on nitride semiconductor devices, specifically InGaN, motivates the search for earth-abundant alternatives for use in efficient, high-quality optoelectronic devices. II-IV-N2 compounds, which are closely related to the wurtzite-structured III-N semiconductors, have similar electronic and optical properties to InGaN namely direct band gaps, high quantum efficiencies and large optical absorption coefficients. The choice of different group II and group IV elements provides chemical diversity that can be exploited to tune the structural and electronic properties through the series of alloys. Here I will describe the first theoretical and experimental investigation of the ZnSnxGe1−xN2 series as a replacement for III-nitrides.

Finally I will give an outlook on the potential of excited state and non-equilibrium phenomena for nano-mesoscale devices.

Bio: Prineha received her Ph.D. in Applied Physics from the California Institute of Technology (Caltech), advised by Professors Harry A. Atwater and Nathan S. Lewis, as a National Science Foundation Graduate Fellow and Resnick Sustainability Institute Fellow. There she focused on light-matter interactions, ranging from quantum plasmonics to nitride optoelectronics. She was recently appointed as a Royal Society Newton Fellow to work in quantum photonics with Professor Sir John Pendry at Imperial College, London. Prineha’s research interests are in the area of excited state and ultrafast dynamics.

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Monday, February 8
Aaswath Raman
Stanford University
10am, Singh Glandt Forum
Broadband Nanophotonics: Controlling Thermal Radiation and Light Absorption for Energy and Information Applications

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Abstract: Meeting increasing global demand for energy while reducing carbon emissions remains one of the grand challenges of this century. Nanoscale photonic structures, by their small length scales, can manipulate light and heat in unprecedented ways, thereby enabling new possibilities for energy efficiency and generation to meet this challenge. In this talk, I will show how controlling the electromagnetic fields associated with thermal radiation and solar absorption using nanophotonic structures can fundamentally enable new technological capabilities for clean energy, by allowing us to better use both sunlight and another, unexploited renewable thermodynamic resource: the cold of space. Moreover, motivated by information applications, I will show how we can better characterize the fundamental behavior of important classes of nanophotonic devices over a broad range of wavelengths.

One particular application that motivates global interest in new approaches to energy efficiency is cooling, which is a significant end-use of energy globally and a major driver of peak electricity demand. I will present results of the first experimental demonstration of daytime radiative cooling, where a sky-facing nanophotonic surface passively achieved a temperature of 5-10°C below the ambient air temperature under direct sunlight. I will also discuss related work on using thermal nanophotonic approaches to passively maintain solar cells at lower temperatures, while maintaining their solar absorption, to improve their operating efficiency.

Motivated by the goal of better exploiting another source of renewable energy, sunlight, I will present a nanophotonic light trapping theory which reveals that, at the nanoscale, it is possible to exceed conventional limits on light trapping in solar cells for all absorption regimes, and explain the mechanisms for this enhancement. Finally I will introduce a plasmonic and metamaterial band theory that can rigorously model an important class of nanophotonic devices made of metallic or dispersive elements, over a broad range of wavelengths. This band theory offers insight into the performance of this class of devices in sensing and modulation applications.

Bio: Aaswath Raman is an Engineering Research Associate with the Ginzton Laboratory at Stanford University. He received his Ph.D. in Applied Physics from Stanford University in 2013, and his A.B. in Physics & Astronomy and M.S. in Computer Science from Harvard University in 2006. His research interests include nanophotonics, thermal science, renewable energy systems, solid-state devices and machine learning. In 2013, he was the recipient of the Stanford Postdoctoral Research Award, and in 2011, the SPIE Green Photonics Award, and the Sir James Lougheed Award of Distinction Fellowship from the Government of Alberta, Canada. In 2015, he received MIT Technology Review’s Innovator Under 35 (TR35) Award for being a Pioneer in Energy.

Thursday, February 11
Sam Emaminejad
UC, Berkeley
10am, Singh Glandt Forum
An Ecosystem of Integrated Physiological Monitoring Platforms for Personalized Medicine

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Abstract: The number of interconnected sensors are expected to increase beyond trillions of units over the next decade, representing about 1000 devices per person in the world. The intersection of this trajectory with the pressing need for lowering healthcare expenditures necessitates a subset of these devices geared towards health monitoring of individuals to enable personalized medicine. This approach allows for the collection of large data sets which can guide clinical investigations and ultimately generate predictive algorithms to understand the clinical needs of individuals and society as a whole. In order to gain a comprehensive view of the health status of individuals, these devices should provide insight into the physiological biomarkers in humans’ samples.

To this end, I aim to develop an ecosystem of human biomonitoring platforms that can continuously analyze various humans’ physiological samples and their surrounding environments. In order to realize these platforms, an integrated-system approach must be adopted to accurately process and seamlessly relay the originated information from the sensor interface to cloud servers online. Furthermore, at the sensor-level, novel MEMs/NEMs-based technologies must be developed to perform actuation and sensing at length-scales comparable to the size of the target biomarkers. During this talk, I will discuss the design considerations that must be met to allow for extraction of meaningful information from physiological samples. In this context, I will present a flexible fully-integrated and wearable perspiration analyzer that accurately and simultaneously measures the main electrolytes (e.g. sodium and potassium) and metabolites (e.g. glucose and lactate) of sweat in real-time while calibrating the sensors' response against the change in skin temperature. Furthermore, I will present the unprecedented micro/nanoscale actuation and sensing functionalities that I demonstrated in the context of portable monitoring platforms.

I will conclude my talk with a discussion of future research directions which prelude my long term vision of developing an ecosystem of integrated portable, wearable, and implantable sensors to facilitate large scale population and epidemiological studies.

Bio: Sam Emaminejad received his BASc (2009) and MS/PhD (2011/2014) degrees in Electrical Engineering from the University of Waterloo and Stanford University, respectively. He pursued his PhD thesis at Stanford Genome Technology Center where he focused on applying micro- and nanotechnologies to develop low-cost and integrated biosensing and bioeletronics platforms. As a joint-postdoctoral scholar at UC Berkeley and Stanford School of Medicine, Sam is currently exploiting flexible electronics technology to develop non-invasive wearable sensors and systems for physiological monitoring and personalized medicine applications. Sam has previously worked as an ASIC and Analog Designer in semiconductor companies such as STMicroelectronics and Analog Devices. Sam was awarded Microsoft Merit and Natural Sciences and Engineering Research Council (NSERC) scholarships and was the recipient of the Best Paper Award at the IEEE Sensors conference in 2013. His current work has been widely reported by various media outlets including Nature, Science, Time, The Wall Street Journal, Newsweek, etc.

Thursday, February 18
Jun-Chau Chien
UC, Berkeley
11am, Moore 216
mm-Wave Lab-on-CMOS: Electromagnetic Sensing from Micro- to Nano-scales

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Abstract: Lab-on-CMOS is an emerging platform for Point-of-Care diagnostics and
precision medicine. By directly integrating active CMOS electronics into passive
Lab-on-Chip devices, the new System-on-Chip not only offers ultimate device
miniaturization but also enables highly integrated multiphysics biosensing and
actuation. This research addresses the challenges in such a hybrid system while
embracing the opportunities in system co-design to achieve improved sensing
performance that leads to new scientific findings.

As an example, I will present my research on a Lab-on-CMOS dielectric
spectrometer for single-cell analysis using near-field sensing at millimeter-wave
(mm-Wave) frequencies. The aim is to understand wideband electromagnetic
signatures at cellular and molecular levels and to open its way for real-time and
label-free medical diagnostics and biological studies. I will focus on innovations in
circuits, systems, microfluidics, and calibration techniques to enable a
capacitance equivalent sensitivity limit of sub-aF for large-scale characterization
of cellular dielectric spectroscopy in the setting of high throughput flow cytometry.
Furthermore, the combination of multiphysics actuation expands the signal
dimensions for applications including rare cell detection. Next, I will discuss the
challenges in sensing toward nano-scales and sub-THz frequencies. Specifically,
I will present an on-chip electronic calibration (E-Cal) technique for nano-device
S-parameters measurements by exploiting impedance programmability. In the
end, I will conclude my talk with Lab-on-CMOS technology for new applications in
sensing, imaging, and communication.

Bio: Jun-Chau Chien received the B.S. and M.S. degrees in Electrical Engineering from National Taiwan University in 2004 and 2006, respectively, and the Ph.D.
degree in Electrical Engineering and Computer Sciences from University of
California, Berkeley, in 2015. He is currently a post-doctoral research associate
at University of California, Berkeley. He has held industrial positions at
InvenSense, Xilinx, and HMicro working on mixed-signal integrated circuits for
inertial sensors and wireline/wireless transceivers. He is broadly interested in
innovative biotechnology for point-of-care diagnostics and medical imaging with
emphasis on silicon-based approaches.

Dr. Chien is the recipient of the 2006 Annual Best Thesis Award from Graduate
Institute of Electronics Engineering, National Taiwan University, the 2007
International Solid-State Circuit Conference (ISSCC) Silkroad Award, the co-
recipient of 2010 IEEE Jack Kilby Award for ISSCC Outstanding Student Paper,
the 2014 Analog Devices Outstanding Design Award, the 2014 Microwave
Theory and Techniques Society (MTT-S) Graduate Fellowship for Medical
Applications, the 2014 Solid-State Circuit Society (SSCS) Predoctoral
Achievement Award, and the 2014 UC Berkeley Outstanding Graduate Student
Instructor Award.

Tuesday, February 23
Minjie Chen
MIT
11am, Towne 337
Towards Miniaturized High-Performance Power Electronics

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Abstract: Power electronics is everywhere in our daily lives, with applications ranging from renewable energy and data centers to portable and biomedical electronics.
These applications are driving demand for power electronics that offer higher performance, smaller physical size, higher reliability, and lower cost. Architectural
innovation enables miniaturization and performance improvements. An emerging
trend is to use more sophisticated and distributed circuits and controls to
leverage the advances of semiconductor devices to realize efficient power
conversion with reduced device stress and energy storage requirements. In
pursuit of this vision, I will present a hybrid switched-capacitor/-magnetics circuit
architecture that can significantly reduce the passive component size in power
electronics, and at the same time realize high power density, high efficiency, and
low cooling requirements. A systematic approach to modeling impedances and
current distribution in planar magnetics will also be presented. This approach
opens fertile ground for circuit optimization and architectural innovation through
more sophisticated magnetics design. Finally, I will discuss how architectural
innovation in power electronics can benefit power efficiency, density, and system
performance in important applications including solar micro-inverters, telecom
power supplies, and LED drivers.

Bio: Minjie Chen received the B.S. degree from Tsinghua University in 2009, and
the S.M., E.E., and Ph.D. degrees from MIT in 2012, 2014 and 2015,
respectively.  He is currently a postdoctoral research associate in the MIT Research Laboratory of Electronics. His primary research interests are in the
design of high performance power electronics for emerging and high-impact
applications, including renewable energy, lighting, grid-interface power
electronics, and miniaturized power management systems. He is the recipient of
the MIT E.E. Landsman Fellowship with a focus on power electronics, and a co-
winner of an IEEE ECCE best student demonstration award.

 

Thursday, February 25
Hui Fang
University of Illinois at Urbana-Champaign
11am, Moore 216

Read the Abstract and Bio

TBA

 

Tuesday, March 1
Kejie Fang
Caltech
11am, Towne 337

Read the Abstract and Bio

TBA

 

Thursday, March 3
Ethem Erkan Atakka
University of Michigan
11am, Moore 216

Read the Abstract and Bio

TBA

 

Thursday, March 10
Saman Saeedi
Caltech
11am, Moore 216

Read the Abstract and Bio

TBA

 

Tuesday, March 15
Carlee Joe-Wong
Princeton University
11am, Towne 337

Read the Abstract and Bio

TBA

 

Thursday, March 17
Dimitris Papailiopoulos
UC, Berkeley
11am, Moore 216

Read the Abstract and Bio

TBA

 

Thursday, March 24
Hamza Fawzi
MIT
11am, Moore 216

Read the Abstract and Bio

TBA

 

Thursday, March 31
Yuxin Chen
Stanford University
11am, Moore 216

Read the Abstract and Bio

TBA

 

Fall 2015

Keren Bergman

September 15
Boon Thau Loo
University of Pennsylvania
Declarative Network Programming: From Implementation, to Verification, and Synthesis

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Abstract: Declarative networking is a programming methodology that enables developers to concisely specify network protocols and services, and directly compile these specifications into a dataflow framework for execution. This talk describes advances in declarative networking, tracing its evolution from a rapid prototyping framework towards a platform that serves as an important bridge connecting formal theories for reasoning about protocol correctness and actual implementations. The second half of the talk explores new frontiers in declarative network synthesis, in particular, our recent work on NetEgg, a scenario-based programming framework that allows network operators to program network policies by describing representative example behaviors. Given these scenarios, our synthesis algorithm automatically infers the controller state that needs to be maintained along with the flow-table rules to process network events and update state. The talk concludes with an outline of ongoing research directions, in the areas of declarative automation in software-defined data centers.

Bio: Boon Thau Loo is an Associate Professor in the Computer and Information Science (CIS) department at the University of Pennsylvania. He is also the CIS Masters Chair, overseeing all masters programs within the CIS department, and Director of the Master of Science in Engineering in CIS program. He received his Ph.D. degree in Computer Science from the University of California at Berkeley in 2006. Prior to his Ph.D, he received his M.S. degree from Stanford University in 2000, and his B.S. degree with highest honors from UC Berkeley in 1999. His research focuses on distributed data management systems, Internet-scale query processing, and the application of data-centric techniques and formal methods to the design, analysis and implementation of networked systems. He was awarded the 2006 David J. Sakrison Memorial Prize for the most outstanding dissertation research in the Department of EECS at UC Berkeley, and the 2007 ACM SIGMOD Dissertation Award. He is a recipient of the NSF CAREER award (2009) and the Air Force Office of Scientific Research (AFOSR) Young Investigator Award (2012). He has published 100+ peer reviewed publications and has supervised 7 Ph.D dissertations. His graduated PhD students include 3 tenure-track faculty members and winners of 3 dissertation awards.

Keren Bergman

September 22
H. Vincent Poor
Princeton University
Fundamental Limits on Information Security and Privacy

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Abstract: As has become quite clear from recent headlines, the ubiquity of technologies such as wireless communications and on-line data repositories has created new challenges in information security and privacy. Information theory provides fundamental limits that can guide the development of methods for addressing these challenges. After a brief historical account of the use of information theory to characterize secrecy, this talk will review two areas to which these ideas have been applied successfully: wireless physical layer security, which examines the ability of the physical properties of the radio channel to provide confidentiality in data transmission; and utility-privacy tradeoffs of data sources, which quantify the balance between the protection of private information contained in such sources and the provision of measurable benefits to legitimate users of them.  Several potential applications of these ideas will also be discussed.

Bio: H. Vincent Poor is Dean of the School of Engineering and Applied Science at Princeton University, where he is also the Michael Henry Strater University Professor. His research interests are primarily in the areas of information theory and signal processing, with applications in wireless networks and related fields. Among his publications is the recent book Principles of Cognitive Radio (Cambridge University Press, 2013).  An IEEE Fellow, Dr. Poor is a member of the National Academy of Engineering and the National Academy of Sciences, and is a foreign member of the Royal Society. Recent recognition of his work includes the 2014 URSI Booker Gold Medal, and honorary doctorates from several universities.

Keren Bergman

September 29
Mo Li
University of Minnesota
Silicon photonics: Breadboard for novel optical physics and materials

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Abstract: Development of silicon photonics has already been taken over from academia by the semiconductor industry aiming to build low-power inter-chip and intra-chip optical interconnect in large-scale with a bandwidth potentially reaching Tbits/sec. On the other hand, in research laboratories, integrated silicon photonic circuits provide high performance optical instruments enabling exploration of new optical physics and novel optoelectronic materials. In this talk, I will showcase four examples of my group’s research in photonics using silicon photonic chips as the underlying optical breadboards. First, we demonstrate a cavity optomechanical system that can mechanically shuttle photons between distant cavities and measure spin angular momentum of photons. Second, we show the integration of surface acoustic waves devices operating at microwave frequency up to 20 GHz with nanophotonic cavitis and strong acousto-optic modulation enabled by co-confinement of light and sound waves. Third, a recently emerged two-dimensional material, black phosphors or phosphorene, is integrated on silicon photonics to achieve efficient broadband photodetection, enabled by black phosphorus’ direct and narrow bandgap. Finally, we introduce rare-earth transition-metal magnetic materials, whose magnetization can be switched by ultrafast laser pulses, to demonstrate the first all-optically switchable magnetoresistive devices that can be integrated with silicon photonics. This latest result of ours introduces a brand new category of non-volatile and ultrafast opto-magnetic devices to the inventory of photonic devices for information recording and communication.

Bio:
Mo Li is an Associate Professor in the Department of Electrical and Computer Engineering at the University of Minnesota. From 2007 to 2010, he was a postdoctoral associate in Department of Electrical Engineering at Yale University. He received his Ph.D. degree in Applied Physics from Caltech in 2007. His honors include Guillermo E. Borja Career Development Award of UMN in 2015, NSF CAREER Award in 2014, McKnight Land-Grant Professorship of UMN in 2013 and an AFOSR Young Investigator Award in 2012. His primary research interests are nanophotonics, nano-optomechanical systems (NOMS), 2D material optoelectronics, NEMS/MEMS, quantum photonic measurement and sensing.

Keren Bergman

October 6
Kerry Bernstein
Defense Advanced Research Projects Agency (DARPA)
A Matter of TRUST

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Abstract: Just after midnight on 6 September, 2007, four Israeli aircraft penetrated Syrian airspace and destroyed a facility that was later confirmed to be developing a nuclear reactor. A May 2008 report in IEEE Spectrum cited European sources later claiming that the Syrian air defense network had been deactivated by a secret built-in kill switch activated by the Israelis. Whether or not the claim was true, this example highlights the potential risks associated with counterfeit or compromised hardware that now exists. Given that the human OS is now performed upon electronic venues, the vulnerability in general of electronic component compromise presents challenges to defense, business, as well as personal security.

Counterfeiting and cloning undermines the economic underpinnings of our industry as well. Electronic component vulnerabilities begin before the component is even manufactured, extending through design and fabrication, into the supply chain, as the part makes its way from conception to its intended application. Because of the global nature of semiconductor design and fabrication, developers must also protect and control the intellectual property expressed in these parts as well. This talk will first provide a taxonomy of the electronic component threat space, and then will survey exemplary approaches for assessing and assuring component integrity. Looking ahead, the talk will conclude with a glimpse at future technologies being developed by DARPA-funded researchers to provide confidence in the devices we depend upon on a daily basis.

Bio: Kerry Bernstein joined DARPA in September 2012 as a program manager in the Microsystems Technology Office.    His interests are in the areas of hardware security; anti-counterfeiting and smuggling mitigation technologies; high performance computing technology/design; and post-CMOS devices. He formerly spent 33 years at the IBM T.J. Watson Research Center and IBM Microelectronics, where he was a Senior Technical Staff Member working in the areas of high performance/low power devices / circuits / architectures; emerging post-CMOS logic switch technologies; and 3D Chip Integration. He attributes any successes realized to be due in large part to being surrounded by wonderful people throughout his entire career.

Mr. Bernstein has co-authored four (4) textbooks, holds 155 patents, and is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE). Mr. Bernstein received his B.S. (1978) in Electrical Engineering from Washington University in St. Louis, Missouri.

October 12 - Special Seminar
Urbashi Mitra
University of Southern California
Active Target Localization via Adaptive, Sparse Sampling

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Abstract: Consider a field of interest from which you can only collect a few observations.  From these observations, we wish to detect whether a target exists and its location. Such a problem arises in military surveillance, environmental monitoring, cyber-security, medical diagnosis, epidemic detection.  In this talk, we consider a novel approach to target detection from sparse samples.  In particular, we model the target of interest as one emitting  a signature that has spatial extent across the field (versus being a single pixel); furthermore this signature is spatially separable and decays as a function of the distance of the observation point from the target.  The  target detection and localization algorithm employs highly incomplete and noisy samples.  For example, one can imagine a vehicle, autonomously traversing over the field to collect these samples and actively determining the next sample to collect.  The novelty of this work is the use of separability and bilinearity to achieve a multi-dimensional trade-off in sample complexity, navigational complexity and detection/localization error, subject to computational tractability. We use methods from matrix completion to solve the localization problem. Thus, matrix completion coupled with binary search provides a solution to the exploration-exploitation problem for target localization. We note that the assumptions on the field are fairly generic and are applicable to many decay profiles; furthermore, our approach does not need exact knowledge of the target signature. Our analysis of the algorithm makes use of tools from concentration of measure in high-dimensional geometry and optimization theory with emphasis on low-rank matrix recovery.  We are able to provide characterizations of the localization performance as a function of sample complexity and features of the underlying signature.  The method is compared to gradient search methods and provides strong improvements and robustness to noise.

Bio: Urbashi Mitra received the B.S. and the M.S. degrees from the University of California at Berkeley and her Ph.D. from Princeton University. After a six-year stint at the Ohio State University, she joined the Department of Electrical Engineering at the University of Southern California, Los Angeles, where she is currently a Professor. Dr. Mitra is a member of the IEEE Information Theory Society's Board of Governors (2002-2007, 2012-2017) and the IEEE Signal Processing Society’s Technical Committee on Signal Processing for Communications and Networks (2012-2016). Dr. Mitra is a Fellow of the IEEE.  She is the inaugural Editor-in-Chief of the IEEE Transactions on Molecular, Biological and Multi-scale Communications. Dr. Mitra is the recipient of: 2014-2015 IEEE Communications Society Distinguished Lecturer, 2012 Globecom Signal Processing for Communications Symposium Best Paper Award, 2012 NAE Lillian Gilbreth Lectureship, USC Center for Excellence in Research Fellowship (2010-2013), the 2009 DCOSS Applications & Systems Best Paper Award, Texas Instruments Visiting Professor (Fall 2002, Rice University), 2001 Okawa Foundation Award, 2000 OSU College of Engineering Lumley Award for Research, 1997 OSU College of Engineering MacQuigg Award for Teaching, and a 1996 National Science Foundation (NSF) CAREER Award. Dr. Mitra currently serves on the IEEE Fourier Award for Signal Processing, the IEEE James H. Mulligan, Jr. Education Medal and the IEEE Paper Prize committees. She has been an Associate Editor for the following IEEE publications: Transactions on Signal Processing (2012-2015), Transactions on Information Theory (2007-2011), Journal of Oceanic Engineering (2006-2011), and Transactions on Communications (1996-2001). She has co-chaired: (technical program) 2014 IEEE International Symposium on Information Theory in Honolulu, HI, 2014 IEEE Information Theory Workshop in Hobart, Tasmania, IEEE 2012 International Conference on Signal Processing and Communications, Bangalore India, and  the IEEE  Communication Theory Symposium at ICC 2003 in Anchorage, AK;  and  general co-chair for the first ACM Workshop on Underwater Networks at Mobicom 2006, Los Angeles, CA Dr. Mitra was the Tutorials Chair for IEEE ISIT 2007 in Nice, France and the Finance Chair for IEEE ICASSP 2008 in Las Vegas, NV.  She served as co-Director of the Communication Sciences Institute at the University of Southern California from 2004-2007.  Her research interests are in: wireless communications, biological communication, underwater acoustic communications, communication and sensor networks, detection and estimation and the interface of communication, sensing and control.

Keren Bergman

October 13 - Rescheduled date TBA
Tomás Palacios
MIT
System-Level Applications of Two-Dimensional Materials:
Challenges and Opportunities

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Abstract: Two dimensional materials represent the next frontier in advanced materials for electronic applications. Their extreme thinness (3 or less atoms thick) gives them great mechanical flexibility, optical transparency and an unsurpassed surface-to-volume ratio. At the same time, this family of materials has tremendously diverse and unique properties. For example, graphene is a semimetal with extremely high electron and hole mobilities, hexagonal boron nitride forms an almost ideal insulator, while MoS2 and other dichalcogenides push the limits on large area semiconductors.

The successful growth of these materials over large areas has allowed their use in numerous system-level demonstrators. For example, the zero bandgap of graphene and its ambipolar has been used in a wide variety of rf and mixed applications, including frequency multipliers, mixers, oscillators and digital modulators. At the same time, the wide bandgap of MoS2 in combination with advanced fabrication technology has enabled its use in memory cells, analog to digital converters and ring oscillators with orders of magnitude better performance than other materials for large area applications. These and other examples will be discussed to highlight the numerous new opportunities of 2D materials.

Bio: Tomás Palacios is an Associate Professor in the Department of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology, where he leads the Advanced Semiconductor Materials and Devices Group. His research focuses on the combination of new semiconductor materials and device concepts to advance the fields of information technology, biosensors and energy conversion. His work has been recognized with multiple awards including the Presidential Early Career Award for Scientists and Engineers (PECASE), the DARPA, ONR and NSF Young Investigator Awards, the IEEE George Smith Award, and numerous best paper awards at conferences such as IEDM, DRC and ISCS. Prof. Palacios has authored more than 200 contributions on advanced semiconductor devices in international journals and conferences, 40 of them invited, 5 book chapters and 20 patents. He is the founding director of the MIT Center for Graphene Devices and 2D Systems (MIT-CG), as well as a recently-funded AFOSR MURI on flexible 2D electronics.

Keren Bergman October 27
Mohammad Hafezi
University of Maryland
Exploring Topological Physics in Photonic Systems
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Abstract:One of the promising applications of quantum computers is quantum simulation --- the ability to simulate quantum dynamics on an engineerable physical system. Such simulators allow us to investigate models that are practically impossible to study on a classical computer. For example, there are tremendous efforts underway to better understand systems with topological order --- global properties that are not discernible locally. The best known examples are quantum Hall effects in electronic system, where insensitivity to local properties manifests itself as conductance through edge states that is insensitive to defects and disorder.

In this talk, I demonstrate how similar physics can be observed for photons; specifically, how various quantum Hall Hamiltonians can be simulated in an optical platform. I report on the first observation of topological photonic edge state using silicon-on-insulator technology. Furthermore, the addition of optical nonlinearity to this system provides a platform to implement fractional quantum Hall states of photons and anyonic states that have not yet been observed. More generally, the application of these ideas can lead to development of optical devices with topological protection for classical and quantum information processing. For more information visit: hafezi.umd.edu

Bio: Mohammad Hafezi is an Assistant Professor of Electrical and Computer Engineering at the University of Maryland (UMD), and a fellow at the Joint Quantum Institute (NIST-UMD) and IREAP. He received his diploma from Ecole Polytechnique (Palaiseau) in 2003. After obtaining his Ph.D. from the physics department at Harvard University, he moved to the Joint Quantum Institute as a postdoc in 2009. His research is at the interface of theoretical and experimental quantum optics and condensed-matter physics with a focus on fundamental physics and applications in quantum information science, precision measurement, and integrated photonics. His recent awards include the Sloan Research Fellowship and the Young Investor award of the Office of Naval Research.

Keren Bergman

November 3
The Jack Keil Wolf Lecture in Electrical and Systems Engineering

Mildred Dresselhaus
MIT
The Oncoming Challenge in Engineering Research and Education
3pm, Wu & Chen Auditorium

Read the Abstract and Bio

Abstract: Speaking on this topic gives me an opportunity to show what advances in science could do for stimulating industrial applications and new educational directions. In 1960 and again in 1990, I had another similar opportunity when I was forced by circumstances to change research fields. Recently, advances in technology and the expected federal support for research is giving me another opportunity to rethink new directions for engineering research and education.

Bio: Mildred Dresselhaus is an Institute Professor at MIT in the departments of Electrical Engineering and Physics. Recent research activities in the Dresselhaus group that have attracted wide attention are in the areas of carbon nanotubes, graphene, and other nanocarbon materials, as well as low-dimensional thermoelectricity. She is a member of the National Academy of Sciences, the National Academy of Engineering, and has served as Director of the U.S. Department of Energy Office of Science, President of the American Physical Society, Treasurer of the National Academy of Sciences, President of the American Association for the Advancement of Science, chair of the U.S. National Academy Decadal Study of Condensed Matter and Materials Physics, and on many advisory committees and councils. Dr. Dresselhaus has received numerous awards, including the U.S. National Medal of Science, the Fermi Award, the Kavli Prize, the Presidential Medal of Freedom, and 31 honorary doctorates worldwide. She is the co-author of eight books and about 1700 papers primarily on carbon science, and is particularly well known for her work on carbon nanomaterials and other nanostructural systems based on layered materials, like graphene, and more recently beyond graphene, like transition metal dichalcogenides and phosphorene. More generally, her research over the years has covered a wide range of problems in condensed matter and materials physics.

Keren Bergman December 1
Paulo Tabuada
UCLA
Robust Cyber-Physical Systems: An Utopia Within Reach
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Abstract: Robustness plays a major role in the analysis and design of engineering systems. Although robust control is a well-established area within control theory and fault-tolerant computation is a well-established area within computer science, it is surprising that robustness remains a distant mirage for Cyber-Physical Systems. The intricate crochet made of control, computation, and communication yarns is known to be brittle in the sense that “small” software errors or "small" sensing, communication, or actuation noise can lead to unexpected, and often unintended, consequences. In this talk I will build on classical notions of robustness from control theory and computer science to make progress towards the utopia of robust Cyber-Physical Systems.

Bio: Paulo Tabuada was born in Lisbon, Portugal, one year after the Carnation Revolution. He received his "Licenciatura" degree in Aerospace Engineering from Instituto Superior Tecnico, Lisbon, Portugal in 1998 and his Ph.D. degree in Electrical and Computer Engineering in 2002 from the Institute for Systems and Robotics, a private research institute associated with Instituto Superior Tecnico. Between January 2002 and July 2003 he was a postdoctoral researcher at the University of Pennsylvania. After spending three years at the University of Notre Dame, as an Assistant Professor, he joined the Electrical Engineering Department at the University of California, Los Angeles, where he established and directs the Cyber-Physical Systems Laboratory.

Paulo Tabuada's contributions to cyber-physical systems have been recognized by multiple awards including the NSF CAREER award in 2005, the Donald P. Eckman award in 2009 and the George S. Axelby award in 2011. In 2009 he co-chaired the International Conference Hybrid Systems: Computation and Control (HSCC'09) and joined its steering committee in 2015, in 2012 he was program co-chair for the 3rd IFAC Workshop on Distributed Estimation and Control in Networked Systems (NecSys'12), and in 2015 he was program co-chair for the IFAC Conference on Analysis and Design of Hybrid Systems. He also served on the editorial board of the IEEE Embedded Systems Letters and the IEEE Transactions on Automatic Control. His latest book, on verification and control of hybrid systems, was published by Springer in 2009.

Keren Bergman December 8
Randall Berry
Northwestern University
Competition and Investment with Shared Spectrum
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Abstract: Access to electromagnetic spectrum is the lifeblood of the wireless industry - an industry that has seen an explosion in demand for wireless data. Meeting the demand will require additional spectrum. However, the traditional approach of clearing spectrum and reallocating it to commercial uses is becoming increasingly difficult. This in turn has led to much interest in new approaches for spectrum management and in particular for approaches in which spectrum is shared among different users. These approaches raise not only technical challenges but also can fundamentally change the economic interactions among wireless service providers. In this talk we will discuss several models that seek to provide insight into such scenarios.

Bio: Randall Berry joined Northwestern University in 2000, where he is currently a Professor in the Department of Electrical Engineering and Computer Science. He received the M.S. and PhD degrees in Electrical Engineering and Computer Science from MIT in 1996 and 2000, respectively. Dr. Berry is the recipient of a 2003 CAREER award from the National Science Foundation. He is an IEEE Communications Society Distinguished Lecturer for 2013-15. He has served as an Editor for the IEEE Transactions on Wireless Communications from 2006 to 2009, and an Associate Editor for the IEEE Transactions on Information Theory from 2009 to 2011, in the area of communication networks. He has served on the program and organizing committees of numerous conferences including serving as the co-chair of the 2012 IEEE Communication Theory Workshop and a technical co-chair of 2010 IEEE ICC Wireless Networking Symposium. He is an IEEE Fellow.