Conferences, Lectures, & Seminars
Events for June
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MRI Coils: Theory and Practice
Tue, Jun 05, 2012 @ 02:30 PM - 04:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Professor Cecil Hayes, University of Washington
Talk Title: MRI Coils: Theory and Practice
Abstract: Radio frequency coils provide the interface between patient and the electronics in an MRI scanner. All the information conveyed between the subject and the scanner passes through and is conditioned by the RF coils. Thus, the design of the RF coils is a critical element in the overall performance of an MRI scanner. Transmit coils produce the radio frequency field B1, which excites and manipulates the nuclear spins. Most often, the transmit coil is a large volume coil that produces a homogeneous RF field so that all spins are excited equally. The primary function of a receive coil is to pick up the magnet field generated by the precessing spins and convert it to an electronic signal. The receive coil also picks up noise emanating from the sample material such as tissue. A well designed receive coil and its preamplifier should add very little additional noise to the desired signal. A small surface coil can produce a higher signal-to-noise ratio (SNR) than a larger volume coil but only in localized region. The surface coil couples strongly to the signal locally but not to the noise originating from more distance tissue. The larger field-of-view of a volume coil can be recovered by using a phased array of smaller coils that retain their higher SNR. The amplitude and phase of the signal induced in a surface coil is dependent on the relative location of the voxel and the coil. A technique called parallel imaging exploits this added spatial information of an array to shorten the imaging time by substituting for some of the gradient encoding.
Biography: Prof. Cecil Hayes obtained his Ph.D. in physics from Harvard in 1973. His thesis used NMR to study internal fields in zinc chalcogenides. Post doctorates at Rutgers and University of Utah applied NMR to critical phenomena of xenon and ionic motion in sodium beta alumina. While at Utah, he built a small magnetic resonance imager to quantify lung water in rats. In 1982, he joined GE Medical Systems in Milwaukee and helped developed their 1.5T Signa scanner. He is best known as the inventor of the birdcage coil that is commonly used as the volume coil in most scanners. Since 1991, he has been at University of Washington, where he developed specialized phased arrays for diagnostic imaging and research on humans and animals.
Host: Professor Krishna Nayak and Dr. Yoon Chul Kim
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Mary Francis
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
EE-Electrophysics Seminar
Mon, Jun 11, 2012 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: H. J. Ryoo, Ph.D, Pulsed Power World Class Lab, Korea Electrotechnology Research Institute, University of Science & Technology
Talk Title: KERI’s Solid State Modulator Technology
Abstract: In this seminar, the solid state pulsed power modulators
developed in KERI, based on Power Electronics technologies are
overviewed. During last ten years, several kinds of solid state
modulators were developed in KERI such as IGBT stacks with step
up transformer, full IGBT stack based marx generator, modified
IGBT marx generator and high repetitive solid state modulator.
Basic principle of the design is described and each pros and cons are compared. KERI's solid state pulsed power modulators have a lot of advantages for industrial pulsed power application focused on everlasting life cycle and high repetitive, and shows superior arching protection ability.
Host: Dr. Andras Kuthi
Location: Frank R. Seaver Science Center (SSC) - 604
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
How Asynchronous Circuits Undeniably Improve the Inter-Cluster Communication Performance of 2D and 3D MP-SoCs
Mon, Jun 18, 2012 @ 10:00 AM - 11:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Abbas Sheibanyrad, TIMA Laboratory
Talk Title: How Asynchronous Circuits Undeniably Improve the Inter-Cluster Communication Performance of 2D and 3D MP-SoCs
Abstract: It is more than half a century the field of asynchronous circuits has begun to attract the attention of researchers. Since then a large number of theoretical concerns have been studied in detail. However until recently the research in this field was almost limited to some academic communities. As the research was focused almost on theory rather than practice, this logic circuit design methodology was not globally in use and few numbers of industries were interested to invest on it. Nevertheless, since early 2000 by the emergence of large-scale SoCs the figure has been changed and the Asynchronous Circuits has drawn a high level of interest from both academic and industrial minds. Nowadays one can hardly deny the advantages of using asynchronous circuits for NoCs in large systems and particularly for 3D-NoCs. In this talk I would like to elaborate on the advantages of asynchronous design on the network performance, and as a summary of our research during the last five years on asynchronous NoC and GALS systems, l show how asynchronous circuit makes the construction of large-scale inter-cluster communication infrastructure possible. Furthermore we will discuss on the design of ASPIN (a distributed asynchronous NoC) and on the advantages of asynchronous 3D-NoCs using serialized vertical links and thus on the unavoidable use of asynchronous circuits in future 3D MP-SoCs.
Biography: Abbas SHEIBANYRAD (known Hamed to friends) was born in Dezfoul, a city in southwestern Iran, in 1976. He received a bachelor’s degree in Computer Hardware Engineering from Tehran Polytechnic University. After that he held a design engineer position in the R&D section of a company manufacturing telecommunication equipments, for three years in Tehran. Hamed received a master’s degree in Microelectronic and Integrated System Architecture from the University of Pierre and Marie Curie (Paris 6) in 2004. In March, 2008, from the same university (LIP6) he obtained a PhD degree on Computer Science, Telecommunications, and Electronics. After one year of postdoctoral fellowship in TIMA laboratory in Grenoble, France, since 2009 he is a CNRS (French national center of scientific research) research fellow working in SLS team of the same laboratory. His research interests include principally network-level architecture of Networks-on-Chip.
Host: Prof. Peter Beerel
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Annie Yu
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
