Humidity related failure mechanisms in GaAs based HBT power amplifiers have been investigated. Both electrical and photoemission techniques are used to characterize and identify the degradation of the base-collector junction. Moisture penetration to the HBT surface reduces the junction breakdown voltage and can lead to catastrophic short failure. Observation of biased side emission from cross-s...

We describe our recent work on the design and implementation of high performance Internet services over networks consisting of interconnected high data rate satellites including Direct Broadcast Satellite hosts and terrestrial wireless LANs with various capabilities (with rates from 16 kbps to 10Mbps, including LMDS and MMDS systems). The network can use either bi-directional or receive only sa...

In Ubiquitous computing environment the mobile devices such as PDAs necessarily connect to remote storage servers. We present an iSCSI caching system that localizes iSCSI target to overcome the shortcomings of iSCSI performance dropping sharply as the latency increases. 1 Motivation Mobile devices such as PDAs are evolving to be incorporated into Ubiquitous computing environment. Due to lightly...

Introduction Kidney biopsy is one of the most important diagnostic tools in a nephrologist’s armamentarium. It has been shown that performance of a kidney biopsy in the appropriate clinical setting has the potential to alter the clinical diagnosis as well as change the therapy in many cases. Current biopsy practice is very safe with minimal complications and has the ability to obtain adequate t...