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Events for October 03, 2008
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Spatial Power Combining Techniques for Microwave and mm-Wave PAs - Integrated Systems Seminar
Fri, Oct 03, 2008 @ 02:00 PM - 03:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Seminar by Dr. Michael DeLisio, CTO, Wavestream CorporationApplications of solid-state power amplifiers (SSPAs) have been limited by the amount of power an individual MMIC amplifier can provide. One way to overcome this limitation is to combine the outputs of several solid-state amplifier chips together. Traditional solid-state amplifier approaches use binary combining of many solid-state MMICs, often resulting in heavy, inefficient, and expensive equipment whenever single-chip capabilities are greatly exceeded. Another approach is to spatially combine the outputs of several chips within a single-mode waveguide. Spatial power combining has very low combining losses, reducing the size, weight, DC power draw, and cost of reaching the target output power. This talk will discuss the two approaches to spatial power combining have recently been used to develop waveguide-based solid-state power amplifiers. The Grid Amplifier, which operates at mm-wave frequencies, uses a single output stage chip patterned with an array or grid of transistor pairs. The Deck Amplifier, which operates at microwave frequencies, stacks up cards containing traditional MMIC amplifier chips for spatial combining. Both achieve high power density and high efficiency without compromising ease of manufacture.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Hossein Hashemi
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Optimal Acquisition of a Partially Hedgeable House
Fri, Oct 03, 2008 @ 03:30 PM - 04:30 PM
Daniel J. Epstein Department of Industrial and Systems Engineering
University Calendar
DEPARTMENT OF MATHEMATICS - MATH FINANCE COLLOQUIUMTitle: "Optimal Acquisition of a Partially Hedgeable House"Speaker: Professor Fernando Zapatero, Dept of Finance and Business Economics, USC Marshall School of BusinessABSTRACT: We consider the problem of the optimal time to purchase a house by a
risk-averse investor who has access to complete financial markets and
whose objective is to maximize expected utility from wealth at some fixed
horizon. The house purchase is financially attractive (due to tax advantages, for
example), which provides an incentive to buy as soon as possible;
however, its value is only partially correlated with financial markets and,
therefore, house price risk cannot be perfectly hedged, which provides
an incentive to delay purchase. We are able to fully characterize the
problem in the case of CARA utility, so that we can generate simple numerical
solutions for different parameter values, and study the trade-off between
the two conflicting incentives.Where: KAP 249When: FRIDAY, OCTOBER 3, 2008, 3:30--4:30 PM
Location: Kaprielian Hall (KAP) - 249
Audiences: Everyone Is Invited
Contact: Georgia Lum
