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，2)由1)引起的建议模型的远程流量分析问题。在2002年，我们研究了一种基于C语言的具有泊松到达过程的基本损失和延迟系统性能度量的有效计算算法。提出了一种泊松输入单服务器排队模型，用于分析具有代理缓存的web服务器系统。我们在2002年PC会议上就这些结果进行了三次演讲。早稻田大学。2003年，我们与清华大学的牛志强教授和舒涛教授共同提出了一种新的排队模型，该模型具有设置和关闭时间，这在web访问操作中很常见。考虑到web服务器系统中的重新加载操作，提出并分析了一种基于泊松逼近的重试排队模型。我们将这些结果发表在国际期刊《绩效评估》和IEICE通讯学报上。2004年，我们提出并分析了一种基于web服务器系统重新加载操作模型的重试排队系统，以及一种基于改进服务机制的单服务器排队系统。我们于2005年在英国雷丁举行的第二届电子商务及电讯国际会议上，就前者的研究结果发表了演讲。我们将后者的研究结果发表在《早稻田商业与经济研究》（2005）第41期，第19-28页。

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).