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Events for November 15, 2012
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Toward Understanding Characteristics of Dedicated Short Range Communications (DSRC) for Vehicular Networks
Thu, Nov 15, 2012 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Fan Bai, General Motors Corporation
Talk Title: Toward Understanding Characteristics of Dedicated Short Range Communications (DSRC) for Vehicular Networks
Abstract: IEEE 802.11p-based Dedicated Short Range Communications (DSRC) is considered a promising wireless technology for enhancing transportation safety and improving highway e ciency. We have studied the effects of the mobile vehicle-to-vehicle (V2V) channel on the current IEEE 802.11p standard to investigate how readily they can be applied to vehicular networks. In particular, measured parameters for the V2V channel at 5.9 GHz in suburban, highway, and rural environments are studied in the context of critical parameters for OFDM as implemented in the 802.11p waveform. Actual performance of scaled OFDM waveforms with bandwidths of 20 MHz (bandwidth of IEEE 802.11a), 10 MHz (bandwidth of the draft IEEE 802.11p), and 5 MHz (halved bandwidth of IEEE 802.11p) are described and interpreted in light of the channel parameters. At 20 MHz the guard interval is not long enough, while at 5 MHz errors increase from lack of channel stationarity over the packet duration. For these choices of the 802.11p OFDM waveform, 10 MHz appears to be the best choice. On the other hand, we also find that the performance of DSRC standard might degrade in a challenging V2V channel, partly because the IEEE 802.11p DSRC standard is not fully customized for outdoor, highly mobile channels. We develop a set of equalization schemes that are able to closely track the V2V channel dynamics and thus improve performance at the physical layer. Through a set of empirical experiments, we showed that the performance (in terms of Packet Error Rate) could be significantly improved from 39% (using a simple Least Square Estimator) to 17% (using a sophisticated Spectral Temporal Averaging Estimator).
Biography: Dr. Fan Bai (General Motors Global R&D) is a Senior Researcher in the Electrical & Control Integration Lab., Research & Development, General Motors Corporation, since Sep., 2005. Before joining General Motors research lab, he received the B.S. degree in automation engineering from Tsinghua University, Beijing, China, in 1999, and the M.S.E.E. and Ph.D. degrees in electrical engineering, from University of Southern California, Los Angeles, in 2005. His current research is focused on the discovery of fundamental principles and the analysis and design of protocols/systems for next-generation Vehicular Ad hoc Networks (VANET), for safety, telematics and infotainment applications. Dr. Bai has published about 50 book chapters, conference and journal papers, including Mobicom, INFOCOM, MobiHoc, SECON, ICC, Globecom, WCNC, JSAC, IEEE Transaction on Vehicular Technology, IEEE Wireless Communication Magazine, IEEE Communication Magazine and Elsevier AdHoc Networks Journal. He received Charles L. McCuen Special Achievement Award from General Motors Corporation âin recognition of extraordinary accomplishment in area of vehicle-to-vehicle communications for drive assistance & safety.â He serves as Technical Program Co-Chairs for IEEE WiVec 2007, IEEE MoVeNet 2008, ACM VANET 2011 and ACM VANET 2012. He is an Associate Editor of IEEE Transaction on Vehicular Technology and IEEE Transaction on Mobile Computing, and he also serves as guest editors for IEEE Wireless Communication Magazine, IEEE Vehicular Technology Magazine and Elsevier AdHoc Networks Journal. He is also serving as a Ph.D. supervisory committee member at Carnegie Mellon University and University of Illinois â Urban Champaign.
Host: Andreas Molisch, x04670, molisch@usc.edu
Location: Henry Salvatori Computer Science Center (SAL) - 322
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
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Discover Viterbi: Biomedical Engineering Information Session
Thu, Nov 15, 2012 @ 11:00 AM - 12:00 PM
USC Viterbi School of Engineering, Viterbi School of Engineering Graduate Admission
Workshops & Infosessions
Join us for an online information session about graduate programs in Biomedical Engineering to learn about the exciting opportunities available. Professor and Chair Norberto Grzywacz will be joining the session to highlight important information about the program.
WebCast Link: https://den.webex.com/den/onstage/g.php?t=a&d=922766837
Audiences: Undergrad
Contact: Viterbi Graduate & Professional Programs
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Algorithms For Privacy-Preserving Machine Learning
Thu, Nov 15, 2012 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Anand Sarwate, Toyota Technological Institute at Chicago
Talk Title: Algorithms For Privacy-Preserving Machine Learning
Abstract: The large-scale gathering and storage of personal data is raising new questions about the regulation of privacy. On the technology side, there has been a flurry of recent work on new models for privacy risk and protection. One such model is differential privacy, which quantifies the risk to an individual's data being included in a database. Differentially private algorithms introduce noise into their computations to limit this risk, allowing the output to be released publicly. I will describe new algorithms for differentially private machine learning tasks such as learning a classifier and principle components analysis (PCA). I will describe how guaranteeing privacy affects the performance of these algorithms, the results on real data sets, and some exciting future directions.
Parts of this work are with Kamalika Chaudhuri, Claire Monteleoni, Kaushik Sinha, Staal Vinterbo, and Aziz Boxwala.
Biography: Anand Sarwate is a Research Assistant Professor at the Toyota Technological Institute at Chicago, a philanthropically endowed academic institute located on the University of Chicago campus. Prior to that he was a postdoc in the Information Theory and Applications Center (ITA) at UC San Diego. He received his PhD from UC Berkeley in 2008, and undergraduate degrees in Mathematics and Electrical Engineering from MIT in 2002. He is broadly interested in statistical algorithms applied to problems in distributed systems, signal processing, communications, and privacy and security.
Host: Urbashi Mitra, x04667, ubli@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
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Munushian Visiting Seminar Series
Thu, Nov 15, 2012 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Connie J. Chang-Hasnain, University of California, Berkeley
Talk Title: Flat Photonics Using High Contrast Metastructures
Abstract: A new class of planar optics has emerged using near-wavelength period gratings with a large refractive index contrast. This seemingly simple structure lends itself to extraordinary properties, which can be designed top-down based for integrated optics on a silicon substrate. In particular, the near-wavelength gratings with large index contrast wiht its surrounding materials are referred as high-contrast gratings (HCG). The extraordinary features include an ultra broadband (Δλ/λ>30%) high reflectivity (>99%) reflector for surface-normal incident light. Another feature is a high quality-factor resonance (Q>107) with surface-normal emission. We incorporated HCG as a replacement of conventional distributed Bragg reflectors (DBR) in vertical cavity surface emitting lasers (VCSELs) over a wide wavelength range from 850-nm to 1550-nm. We also demonstrated high-Q cavity with surface-normal input/output beam using a single HCG layer. This resonator is formed without a Fabry-Perot cavity!
By varying HCG dimensions, the reflection phase can be changed, which can be used to control the VCSEL wavelength. Most interestingly, a curved wave front can be obtained by locally changing each grating dimension. This leads to planar, single-layer lens and focusing reflectors with high focusing power, or arbitrary transmitted wavefront generator which can be used to split or route light.
The HCG can be designed to provide reflection and resonances for incident light at an oblique angle as well. A hollow-core waveguide can be made with two parallel HCGs with light guided in-between. The phase of reflection coefficient can be designed such that slow light can be obtained in a hollow-core waveguide. Finally, light propagation can be switched efficiently from surface-normal direction to an in-plane index-guided waveguide and vice versa.
In this talk, I will review the physical insights of the extraordinary properties and show that HCG can be easily designed using simple guidelines for chip-scale optics.
Biography: Connie Chang-Hasnain is the John R. Whinnery Chair Professor in the Electrical Engineering and Computer Sciences Department and Chair of the Nanoscale Science and Engineering (NSE) Graduate Group at the University of California, Berkeley. She received her Ph.D. from the same university in 1987. Prior to joining the Berkeley faculty, Dr. Chang-Hasnain was a member of the technical staff at Bellcore (1987â1992) and Associate Professor of Electrical Engineering at Stanford University (1992â1996). She is an Honorary Member of A.F. Ioffe Institute, a Chang Jiang Scholar Endowed Chair Professor at Tsinghua University, a Visiting Professor of Peking University and National Chiao Tung University.
Professor Chang-Hasnainâs research interests range from semiconductor optoelectronic devices to materials and physics, with current foci on nano-photonic materials and devices for chip-scale integrated optics. She has been honored with the IEEE David Sarnoff Award (2011), the OSA Nick Holonyak Jr. Award (2007), the IEEE LEOS William Streifer Award for Scientific Achievement (2003), and the Microoptics Award from Japan Society of Applied Physics (2009). Additionally, she has been awarded with a National Security Science and Engineering Faculty Fellowship by the Department of Defense (2008), a Humboldt Research Award (2009), and a Guggenheim Fellowship (2009). She was a member of the USAF Scientific Advisory Board, the IEEE LEOS Board of Governors, OSA Board of Directors, and the Board on Assessment of NIST Programs, National Research Council. She has been the Editor-in-Chief Journal of Lightwave Technology since 2007.
Host: EE-Electrophysics
Location: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
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Sanjoy Dasgupta: Cluster trees, Near-neighbor Graphs, and Continuum Percolation
Thu, Nov 15, 2012 @ 03:30 PM - 05:00 PM
Thomas Lord Department of Computer Science
Conferences, Lectures, & Seminars
Speaker: Sanjoy Dasgupta, UC San Diego
Talk Title: Cluster trees, Near-neighbor Graphs, and Continuum Percolation
Series: CS Colloquium
Abstract: What information does the clustering of a finite data set reveal about the underlying distribution from which the data were sampled? This basic question has proved elusive even for the most widely-used clustering procedures. One natural criterion is to seek clusters that converge (as the data set grows) to regions of high density. When all possible density levels are considered, this is a hierarchical clustering problem where the sought limit is called the "cluster tree". We give a simple algorithm for estimating this tree that implicitly constructs a multiscale hierarchy of near-neighbor graphs on the data points. We show that the procedure is consistent, answering an open problem of Hartigan. We also obtain rates of convergence, using a percolation argument that gives insight into how near-neighbor graphs should be constructed.
Biography: Sanjoy Dasgupta is a Professor in the Department of Computer Science and Engineering at UC San Diego. He received his PhD from Berkeley in 2000, and spent two years at AT&T Research Labs before joining UCSD.
His area of research is algorithmic statistics, with a focus on unsupervised and minimally supervised learning. He is the author of a textbook, "Algorithms" (with Christos Papadimitriou and Umesh Vazirani), that appeared in 2006.
Host: Shaddin Dughmi
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Assistant to CS chair
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Matt Dreyer (VMWare): Software Defined Data Center: From Best Effort to 99%
Thu, Nov 15, 2012 @ 03:30 PM - 05:00 PM
Thomas Lord Department of Computer Science
Conferences, Lectures, & Seminars
Speaker: Matt Dreyer , VMWare
Talk Title: Software Defined Data Center: From Best Effort to 99%
Series: CS Colloquium
Abstract: For over a decade enterprises have been deploying a predictable design pattern for datacenter infrastructure and the applications residing there. Unfortunately this approach has failed to deliver the scale and velocity required by a highly competitive and global economy. The software defined datacenter holds the promise of unlocking application scale and deployment velocity for the next generation of applications.
Biography: Matt Dreyer is a Group Product Line Manager at VMware with responsibilities for Cloud Consumption products. Prior to VMware Mr. Dreyer was a Product Line Manager at Cisco where he lead the definition and go to market for the ground breaking Cisco ASA 5580 and ASA 5585 data center security appliances. Mr. Dreyer also managed the transformation of the security management product portfolio including Cisco Security Manager and the next generation Cisco Prime Security Manager. Prior to Cisco, Mr. Dreyer held product management positions at Sonicwall and ServGate where he pioneered "Unified Threat Management" firewalls. Mr. Dreyer graduated in from Colorado State University in 1996 with a BSEE degree. Mr. Dreyer has presented security talks at a number of VMware customer and partner events on topics including network security, application security, and security management.
Host: Minlan Yu
Location: Social Sciences Building (SOS) - B37
Audiences: Everyone Is Invited
Contact: Assistant to CS chair
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Arup Information Session
Thu, Nov 15, 2012 @ 06:00 PM - 08:00 PM
Viterbi School of Engineering Career Connections
Workshops & Infosessions
If you bring a head full of ideas and the willingness to keep exploring, anything is possible with Arup. Our graduate and internship programs offer you a large range of disciplines, fantastic support and outstanding opportunities. As part of our global multidisciplinary design and consultancy firm, you'll have the chance to engage in a fulfilling career, working with some of the most highly respected engineers and specialists in the world. Come to our information session to learn more about Arup and how you can help us shape a better world.
More Information: cf34b724_ARUP_flier.pdf
Location: Grace Ford Salvatori Hall Of Letters, Arts & Sciences (GFS) - 106
Audiences: BS, MS, PhD
Contact: RTH 218 Viterbi Career Services
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EE 101 Supplemental Instruction SessionThu, Nov 15, 2012 @ 07:00 PM - 09:00 PM
Viterbi School of Engineering Student Affairs
Workshops & Infosessions
Supplemental Instruction session for students enrolled in EE 101.
SI offers an informal atmosphere where you and your classmates can explore important concepts, review class notes, discuss assignments, work on practice problems, and go over relevant study skills.
SI is a great study option and we encourage all students to make SI part of their study habits! Come for 30 minutes or the whole 2 hours.Location: Kaprielian Hall (KAP) - 144
Audiences: Undergrad
Contact: Viterbi Academic Resource Center
