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Events for October 06, 2004
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MIMO Broadcast Channels with Partial CSI: Throughput, Fairness, and Delay
Wed, Oct 06, 2004 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Mr. Masoud Sharif, CalTechABSTRACT: The downlink scheduling in a cellular system has to deal with two conflicting goals, namely maximizing the throughput yet at the same time maintaining fairness among the users and minimizing the delay. Information-theoretic results on broadcast channels yield schemes that only maximize the throughput, irrespective of the delay and fairness. In this talk, we first obtain the scaling laws of the sum-rate capacity (throughput) in terms of the number of receive/transmit antennas and the number of users n, under different channel state information (CSI) assumptions. It turns out that the sum-rate capacity heavily depends on the availability of CSI at the transmitter. In cellular systems, the number of users is typically large and obtaining full CSI from all users may not be practically feasible. Therefore, we propose a scheme that only requires partial CSI yet attains the same throughput scaling law as that of full CSI. We show that if the number of transmit antennas is large enough, our scheduling becomes fair, irrespective of the path-loss of users. We further show that the expected worst case delay when using throughput optimal scheduling is log n times worse than the minimum achievable delay. Finally, we look into the trade-offs between the throughput and the worst case delay.BIO: Masoud Sharif was born in 1977. He received the BS (with honors) and MS degrees in electrical engineering from Sharif University of Technology, in 1999 and 2001, respectively. He is currently working towards the Ph.D. degree in the Department of Electrical Engineering, California Institute of Technology, Pasadena, CA.HOST: Dr. Keith M. Chugg, x.07294, chugg@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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Massive Social Networks and Epidemiology
Wed, Oct 06, 2004 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Aravind Srinivasan, University of MarylandHost: Prof. David Kempe (CS)Abstract:Most mathematical models for the spread of disease use differential equations based on uniform mixing assumptions or ad hoc models for the contact process. We explore the use of dynamic bipartite graphs to model the physical contact patterns that result from movements of individuals between specific locations. The graphs are generated by large-scale individual-based urban traffic simulations built on actual census, land-use, and population-mobility data. We find that the contact network among people is a strongly connected small-world-like graph, and present provably-good algorithms and their empirical performance for outbreak detection by placing sensors. Within this large-scale simulation framework, we then analyze the relative merits of a number of proposed mitigation strategies for disease-spread.The talk will mostly be based on the following two papers, and will also briefly touch upon ongoing work:"Modelling Disease Outbreaks in Realistic Urban Social Networks", by S. Eubank, H. Guclu, V. S. A. Kumar, M. V. Marathe, A. Srinivasan, Z. Toroczkai and N. Wang. Nature, Vol. 429, 180-184, May 2004; and"Structural and Algorithmic Aspects of Massive Social Networks", by S. Eubank, V. S. A. Kumar, M. V. Marathe, A. Srinivasan, and N. Wang. Proc. ACM-SIAM Symposium on Discrete Algorithms (SODA), 711-720, 2004.
Location: Hedco Neurosciences Building (HNB) - 100 (Auditorium)
Audiences: Everyone Is Invited
Contact: Irina Strelnik
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Nanoseconds, Megavolts, Picojoules, and Semiconductor Crystal Quantum Dots in the Intracellular Envi
Wed, Oct 06, 2004 @ 12:00 PM - 01:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
University Calendar
P. Thomas Vernier, Ph.D.
Bioelectrical Engineer
University of Southern California
Megavolts, micrometers, picosecondsElectrical engineers play an important role in cross-disciplinary investigations of pulsed power applications in biomedicine at the University of Southern California, providing enabling technology for studies ranging from fundamental research in bioelectrical physics to
cancer diagnostics and therapeutics. We present an overview of this work, which includes:
- validation of biophysical models with experimental observations
(responses of molecules and membranes in living cells to nanosecond,
megavolt-per-meter pulsed electric fields);
- cellular signal transduction (nanoelectropulse-induced
intracellular calcium release);
- mechanisms of programmed cell death induction by ultra-short,
high-field electric pulses;
- internalization of fluorescent quantum dots for cell tagging and
tracking and for monitoring the intracellular environment;
- development of advanced pulse generators, catheter electrodes, and
other devices for remote delivery of nanoelectropulses to biological
systems;
- exploration of minimally invasive nanoelectropulse diagnostics and
therapeutics for malignancies, atherosclerosis, and other medical
conditions.P. Thomas Vernier, Engineering Manager of MOSIS at the University of Southern California Information Sciences Institute, received his Ph.D. in Electrical Engineering from USC in 2004. His research and industrial experience includes ultraviolet microscopy of psychrophilic yeasts, characterization of the temperature-sensitive host restriction of bacterial viruses, environmental gas monitoring, wide-band instrumentation data recording, and multi-project semiconductor wafer fabrication. He currently works on the responses of biological systems to nanosecond, megavolt-per-meter electric fields.Date: Wednesday, October 6, 2004
Place: Olin Hall 230 (OHE)
Time: 12:00 – 1:00
Refreshments will be served at 11:45
ALL First Year EE-EP Graduate Students are REQUIRED to ATTEND
Location: Olin Hall of Engineering (OHE) - 230
Audiences: Electrical Engineering Graduate Students
Contact: Robert Mena
