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Ultra Reliable Computing Systems, Chong Ho Lee
Ultra Reliable Computing Systems, Chong Ho Lee
Dissertations and Theses
For high security and safety applications as well as general purpose applications, it is necessary to have ultra reliable computing systems. This dissertation describes our system of self-testable and self-repairable digital devices, especially, EPLDs (Electrically Programmable Logic Devices). In addition to significantly improving the reliability of digital systems, our self-healing and re-configurable system design with added repair capability can also provide higher yields, lower testing costs, and faster time-to-market for the semiconductor industry.
The digital system in our approach is composed of blocks, which realize combinational and sequential circuits using GALs (Generic Array Logic Devices). We describe three techniques for …
Distributed Cooperative Framework And Algorithms For Wireless Network Performance Optimization, Emily Hong Qi
Distributed Cooperative Framework And Algorithms For Wireless Network Performance Optimization, Emily Hong Qi
Dissertations and Theses
In Wireless Local Access Networks (WLANs), the Medium Access Control (MAC) protocol is the primary element that determines the efficiency of sharing the limited communication bandwidth of the wireless channel. IEEE 802.11 MAC uses the contention-based Distributed Coordination Function (DCF) as a fundamental medium access mechanism. However, the dynamic nature of the wireless environment creates mobility challenges of maintaining maximum channel capacity, of obtaining optimal throughput and latency, and of retaining good security in a distributed wireless network.
This dissertation first introduces a set of parameters to characterize the medium status and radio environment, and a mechanism for mobile devices …