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Resilience against unexpected server failures is a key desirable function of quality-assured service systems. A good capacity planning decision should cost-effectively allocate spare capacity for exploiting failure resilience mechanisms. In this paper, we propose an optimal capacity planning algorithm for server-cluster based service systems,particularly the ones that provision composite services...
The critical security problem in ITS information network is network availability. It is important to avoid flow attack against network availability. This paper analyzes first several current IP-track technologies to find attack route, then analyzes and evaluates the ldquovector edge router samplingrdquo (RVES) method proposed by Chinese experts lately. We developed a prototype system based on RVES...
This paper proposes a digital background calibration algorithm for pipelined analog-to-digital converters (ADCs). The algorithm doesn't modify pipeline stages and only needs simple calibration logic. Based on the analysis of the output codes, the algorithm estimates the bit weight of each stage and calculates the outputs. To verify the algorithm, a 13-bit pipelined ADC with 1.5-bit/stage architecture...
This paper exploits a new charge pump used in integrated solar energy harvesting systems to improve the power efficiency under ultra low supply of under 0.7 V supplied by on-chip photodiodes. Compared with conventional charge pumps, improvements of 20% in terms of output voltage gain and conversion efficiency can be achieved by using two symmetrical branches and PMOSFET-only transfer transistors per...
Effective management of Web Services systems relies on accurate understanding of end-to-end transaction flows, which may change over time as the service composition evolves. This work takes a data mining approach to automatically recovering end-to-end transaction flows from (potentially obscure) monitoring events produced by monitoring tools. We classify the caller-callee relationships among monitoring...
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