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SUNMONTUEWEDTHUFRISAT
Events for December 06, 2006
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Meet USC (AM session)
Wed, Dec 06, 2006 @ 09:00 AM - 12:00 PM
Viterbi School of Engineering Undergraduate Admission
Workshops & Infosessions
This half day program is designed for prospective freshmen and family members. Meet USC includes an information session on the University and the Admission process; a student led walking tour of campus and a meeting with us in the Viterbi School. Meet USC is designed to answer all of your questions about USC, the application process and financial aid.Reservations are required for Meet USC. Please call the USC Admission Center at (213) 740-6616 to check availability and to make an appointment. Be sure to tell them you are interested in Engineering!
Location: USC Admission Center
Audiences: Prospective Freshmen and Family Members - RESERVATIONS REQUIRED
Contact: Viterbi Admission
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Meet USC (PM session)
Wed, Dec 06, 2006 @ 01:00 PM - 04:00 PM
Viterbi School of Engineering Undergraduate Admission
Workshops & Infosessions
This half day program is designed for prospective freshmen and family members. Meet USC includes an information session on the University and the Admission process; a student led walking tour of campus and a meeting with us in the Viterbi School. Meet USC is designed to answer all of your questions about USC, the application process and financial aid.Reservations are required for Meet USC. Please call the USC Admission Center at (213) 740-6616 to check availability and to make an appointment. Be sure to tell them you are interested in Engineering!
Location: USC Admission Center
Audiences: Prospective Freshmen and Family Members - RESERVATIONS REQUIRED
Contact: Viterbi Admission
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Spectrum Sharing: System Design Perspective
Wed, Dec 06, 2006 @ 03:00 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Danijela CabricUniversity of California, BerkeleyA major shift in wireless communications is now emerging with the development of cognitive radios, which attempt to share spectrum in a fundamentally new way. Cognitive radios address the problem of poor spectrum utilization exhibited in many frequency bands. On a conceptual level, cognitive radio networks sense the spectral environment and adapt transmission parameters to dynamically reuse available spectrum. The novelty of this approach requires us to re-architect the mechanisms for using radio frequencies and find a way for multiple systems to co-exist through sharing rather than fixed allocations.This talk addresses fundamental questions in cognitive radios system design and investigates its feasibility by bridging the theoretical and practical aspects of the physical and network layers. We begin with spectrum sensing, the key enabling functionality for cognitive radios, which requires detection of very weak signals of different types in a minimum time with high reliability. We show that the biggest barrier for sensing in very low signal to noise ratio regimes is the variability in the noise and interference that cannot be perfectly calibrated during sensing time. Robustness can be increased by differentiating signals from noise by detecting signal features or by exploiting channel diversity with network cooperation. Through physical implementation and experiments of proposed sensing methods, we identify the minimum possible sensing times and detectable signal levels. Moreover, we include the sensitivities exhibited by these methods to radio and channel impairments. Next, we consider radio architecture for wideband spectrum sharing radios and show that large dynamic range requirements present major challenge in their implementation. This calls for the development of novel mixed signal techniques. By exploiting spatial dimension for selective processing of desired signals through antenna array architectures, strong interferers can be adaptively suppressed. We conclude with a discussion of the requirements for the signaling and protocol designs that support dynamic spectrum access and spectrum sensing coordination.Brief Biography:
Danijela Cabric is a Ph.D. candidate in Electrical Engineering at the University of California, Berkeley in the group of Prof. Robert Brodersen. She received the M.S. in Wireless Communications and VLSI System Design in 2001 from the University of California at Los Angeles and the Diploma in Electrical Engineering from the University of Belgrade, Serbia, in 1998.
Location: Hedco Neurosciences Building (HNB) - 100
Audiences: Everyone Is Invited
Contact: Ericka Lieberknecht
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Dynamics of nonlinear coupled nanomechanical resonators
Wed, Dec 06, 2006 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Ron LifshitSchool of Physics and Astronomy,Tel Aviv University (Currently on sabbatical leave at the California Institute of Technology) Abstract:We are studying the dynamics of nonlinear coupled oscillators,
motivated by recent experiments with arrays of micromechanical and nanomechanical resonators at Caltech and Cornell. We have obtained exact results for the parametric excitation of small arrays using secular perturbation theory [1], as well as an amplitude equation to describe the slow dynamics of the parametric excitation of large arrays [2]. I will focus on these results to explain the intricate experimentally-observed response curves, and to suggest further experiments. If time permits, I will say a few words about our model of synchronization, which is based on reactive coupling and nonlinear frequency pulling [3,4] (rather
than the more common linear dissipative models). [1] Lifshitz and Cross, PRB 67 (2003) 134302;[2] Bromberg, Cross, and Lifshitz, PRE 73 (2006) 016214;[3] Cross, Zumdieck, Lifshitz, and Rogers, PRL 93 (2004) 224101;[4] Cross, Rogers, Lifshitz, and Zumdieck, PRE 73 (2006) 036205.Location: Stauffer Science Lecture Hall (SLH), Room 100
Audiences: Everyone Is Invited
Contact: April Mundy
