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SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for December
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Broadband Internet Access for Mobile Platforms
Wed, Dec 01, 2004 @ 10:30 AM - 11:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
SPEAKER: Mr. Mark Miller, CTO, ViaSatABSTRACT: A two-way satellite communications system provides for transport of Internet Protocols (IP) datagrams will be presented. The communications system is employed on private business jets and is used to provide broadband internet access to the passengers. The task of providing internet access over satellite to moving vehicles, such as aircraft, presents several challenges. The issues and the technical solutions to the problems will be discussed with special emphasis on the design of the physical layer (modulation, coding, and multiple access techniques) of the communication system.BIO: Mark Miller received the BSEE and MSEE degrees from UCSD and UCLA in 1981 and 1982 respectively. He has over 20 years of industry experience, all of which have been spent performing engineering research and product development. From 1982 to 1983 he was employed at Cubic defense Systems in San Diego California. From 1983 to 1986 he was employed at M/A-COM Linkabit as a communications systems engineer. In 1986 he co-founded ViaSat Inc, where he has been employed ever since. Currently he holds the position of Vice President and Chief Technical Officer at ViaSat. His main technical interests and active work lie in area of modulation, coding, digital signal processing and multiple access techniques. He is the holder of numerous patents and has taught Satellite Communications through the UCSD extension program.HOST: Dr. Keith Chugg, chugg@usc.edu
Location: Hedco Neurosciences Building (HNB) - 107
Audiences: Everyone Is Invited
Contact: Mayumi Thrasher
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Seminar by Dr. David Alderson, California Institute of Technology
Thu, Dec 02, 2004 @ 10:00 AM - 11:00 AM
Daniel J. Epstein Department of Industrial and Systems Engineering
Conferences, Lectures, & Seminars
When Systems Don't Scale: Avoiding Collapse in Congestion-Sensitive Processing SystemsDr. David AldersonPostdoctoral Scholar
Division of Engineering and Applied Science
California Institute of TechnologyABSTRACTIn this talk, I will introduce a class of congestion-sensitive processing systems in which the instantaneous output rate changes with the total amount of work in the system. Specifically, we consider systems that are susceptible to "congestion-induced collapse", in the sense that their output rate tends toward zero as their system workload gets large. We develop a sequence of models that allow us to characterize key features of system behavior, and we identify management policies that achieve optimal performance while preventing collapse. In particular, we develop stochastic models that show collapse in these systems is unavoidable unless one can impose admission control on newly arriving work. We prove that the optimal admission policy is a non-randomized threshold policy, and we solve for the threshold that maximizes system reward. This type of congestion-sensitive behavior is relevant to a variety of applications, including computer networking, telecommunications, and transportation systems.
Location: Ethel Percy Andrus Gerontology Center (GER) - 309
Audiences: Everyone Is Invited
Contact: Shah Nirav
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Protecting Our Homeland: Incorporating Terrorism Risk in State Homeland
Wed, Dec 15, 2004 @ 10:30 AM - 12:00 PM
Daniel J. Epstein Department of Industrial and Systems Engineering
Conferences, Lectures, & Seminars
Protecting Our Homeland: Incorporating Terrorism Risk in State Homeland
Security GrantsAlexia BrunetPh.D. Candidate, Purdue University
J.D. Candidate, Northwestern School of LawABSTRACTVulnerabilities realized following the terrorist attacks of September 11, 2001 highlight the need for the Federal government to allocate funding for the prevention and response to terrorist events at the risk factor level. However, the funding formula used by the State Homeland Security Program (SHSP) relies upon a lump sum to all states plus an incremental amount allocated according to population. Therein the formula does not explicitly address varying risks across States. The objective of this paper is to formulate theoretically an alternative formula to distribute SHSP funding based on terrorism risk across States. Unique Indiana county-level risk factor data are used to infer the optimal funding to cover expected damages associated with various infrastructure categories: hazardous material sources, Federal and State facilities, hospitals, interstates, pipelines, power generation, public water supply points, surface water intakes, airports, universities, and confined feeding operations. Risk-based allocations to the 50 States are calculated using the Indiana implied optimal weights as a reduced form of expected damage exposure. Finally, we use the deviation between the current allocations and the risk model calculated allocations to assess (i) which risk assets and (ii) which States are under funded by the current government allocation.
Location: RALPH AND GOLDY LEWIS HALL (RGL) ROOM 308
Audiences: Everyone Is Invited
Contact: Shah Nirav
