Browsing by Author "Wang, HJ"

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Design and analysis of an ATM switch with priority discarding scheme
(2001-03-01)
Wang, K
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Wang, HJ
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資訊工程學系
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Department of Computer Science
In this paper; we propose an N x N high speed and non-blocking asynchronous transfer mode (ATM) switch with input and output buffers. In this switch, each buffer adopts a priority discarding scheme, which discards incoming cells of low-priority traffic when its queue length is greater than a predefined threshold value. Our switch also supports broadcast/multicast functions without increasing the cost and imposing a significant performance penalty. We use the discrete-time Markov chain model to analyze cell delay and cell loss probability for each traffic class. An example 4 x 4 ATM switch has been described with VHDL. We have verified the functionality of the switch via VHDL simulation, and have synthesized the switch to evaluate its area and timing. Experimental results and synthesis results show that our proposed ATM switch can meet a requirement for high speed and support QOS.
Functional analysis of alanine-scanning and site-directed mutations in the oxidosqualene-lanosterol cyclase gene of Saccharomyces cerevisiae
(2001-03-07)
Wu, TK
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Wang, HJ
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Chiu, FH
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交大名義發表
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National Chiao Tung University
Tryptophan 232 within oxidosqualene-lanosterol cyclase from Saccharomyces cerevisiae influences rearrangement and deprotonation but not cyclization reactions
(2006-03-30)
Wu, TK
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Yu, MT
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Liu, YT
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Chang, CH
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Wang, HJ
Oxidosqualene-lanosterol cyclases convert oxidosqualene to lanosterol in yeast and mammals. Site-saturated mutants' construction of Saccharomyces cerevisiae oxidosqualene-lanosterol cyclase, at Trp232 exchanges against proteinogenic amino acids, and product profiles are shown. All mutants, except Lys and Arg, produced protosta-12,24-dien-3 beta-ol, lanosterol, and parkeol. Overall, Trp232 plays a catalytic role in the influence of rearrangement process and determination of deprotonation position but does not involve intervention in the cyclization steps.