Development and Implementation of On-Line Preventive Maintenance Techniques to Realize Highly Reliable Information Communication Systems

在未来，以大规模的计算机和通信网络实现信息化社会，创造遍及全球的信息物流环境是十分重要的。实现上述要求的基础技术是信息通信网络的先进的可靠性和安全性技术，这些技术正日益得到大力发展。特别是，我们必须对光通信设备和泛在服务等下一代网络愿景保持敏感，并对其进行监控，解决计算机软硬件系统的可靠性设计、可靠性评估和维护技术、计算机安全技术、信息网络流量分析/测量技术、服务质量评估等基础技术方面出现的新问题。针对网络中常见的网络拥塞、网络延迟和任务不交付等问题，提出了一种新的在线预防维护技术及其性能评价方法。我们的研究团队由三个研究小组组成：(1)在线维护算法的开发（Dohi, Osaki， Kaio和sandoh），(2)交通模型的性能评估分析（Kimura和Aida），(3)系统开发（Okamura和rinaka），我们建立了每个研究成果，以实现非平凡的可靠性和维护技术。在在线算法的开发中，我们实现了备份路径的自适应路由控制算法和基于性能评估模型的在线预防性维护算法。在流量模型的分析和评价中，实现了所提出的在线维护算法的提速，并在LSR中开发了一个自治分散控制系统（ADCS）来控制/收集网络内的统计链路数据。最后，我们在广岛大学的实服务器系统上实现了所有系统，并增加了根据运行环境变化更新路径信息的功能。少

It is quite important to realize the information-oriented society, with large scaled computer and communication networks and create the information logistic circumstance spreading to all over the world in the future. The fundamental techniques for the above requirements are the, advanced reliability and safety, technologies to the information communication networks, and are being developed with much effort day by day. Especially, we have to be sensitive to the network vision in the next generation, like optical communication devices and ubiquitous Service, monitor them and resolve the emergent problems on fundamental technologies for (i) Reliable design, reliability evaluation and maintenance technology for computer hardware/software systems, (ii)Computer security technology, (iii)Analysis/measurement techniques of information network traffic,(iv) Quality of service evaluation. In this research we develop a novel on-line preventive maintenance technology and its performance evaluation … More method to prevent the network congestion, the network delay and non-delivery of tasks, which are often seen in Internet. Our research team consists of three research groups: (1) Development of on-line maintenance algorithms (Dohi, Osaki, Kaio andSandoh), (2) Analysis of performance evaluation of traffic models (Kimura and Aida), (3) System development (Okamura and Rinsaka), so that we built up each research result to achieve the non-trivial reliability and maintenance technique. In the development of on-line algorithms, we implemented an adaptive routing control algorithm of back-up Paths and an on-line preventive maintenance' algorithm based on the performance evaluation model.In the analysis and evaluation of traffic model, we realized the speed-uP of the proposed on-line maintenance algorithm, and developed an autonomous decentralized control system (ADCS) in the mid LSR' in order to control/collect the statistical link data within the network Finally, we implemented all the systems on the real server system in Hiroshima University and added a new function to update the pathinformation which changes according to the operation environment. Less