Performance Evaluation Techniques for Web Server Access Operation in E-Commerce

为了建立Web访问操作的性能评估技术，我们必须解决1)电子商务中Web访问操作的远程流量建模问题，以及2)所提出的模型的远程流量分析问题。2002年，我们用C语言研究了泊松到达过程的基本损失和时滞系统的性能指标的一个有效的计算算法。提出了一种用于分析具有代理缓存的Web服务器系统的泊松输入单服务器排队模型。我们在2002年的PC会议上就这些结果进行了三次演讲。早稻田大学。2003年，我们与清华大学牛振中教授和舒涛教授共同提出了一种新的具有启动时间和关闭时间的排队模型，这种排队模型在网络访问操作中非常常见。针对Web服务器系统中的重试操作，提出并分析了一种基于泊松到达近似的重试排队模型。我们在国际期刊《绩效评估》以及IEICE通讯会刊上发表了这些结果。2004年，我们提出并分析了一个重试排队系统，该系统模拟了Web服务器系统中的重载操作，以及一个带有改进服务机制的单服务台排队系统，该系统推广了设置时间模型。2005年，我们在英国雷丁举行的第二届国际电子商务和电信会议(ICETE)上发表了关于上述结果的演讲。我们在《早稻田商业与经济研究》，第41期，第19-28页(2005)上发表了后一项研究结果。

In order to establish performance evaluation techniques for web access operations, we have to solve 1) tele-traffic modeling issues of a web access operation in E-commerce, and 2) tele-traffic analysis issues of proposed models arising out of 1). In 2002, we investigated to propose an efficiently computing algorithm for performance measures in fundamental loss and delay systems with Poisson arrival processes via C language. We proposed a Poissonian input single-server queueing model for analyzing a web server system with proxy cache. We presented three talks on these results at 2002 PC Confsrence. Waseda University. In 2003, jointly with Prof Z. Niu and T. Shu at Tsinghua University, we proposed a new queueing model with setup and close-down times, which is frequently seen in a web access operation. Taking into account reload operation in a web server system, we proposed and analyzed a retrial queueing model via Poisson arrival approximation. We published these result in an international journal : Performance Evaluation as well as the IEICE Transactions on Communications. In 2004, we presented and analyzed a retrial queueing system modeling reload operation in a web server system, and a single-server queueing system with modified service mechanism which generalized setup time models. We presented a talk on the former result at the second International Conference on e-Business and Telecommunication(ICETE), Reading, UK, 2005. We published the latter result in Waseda Business & Economic Studies, No.41, pp.19-28(2005).