Assurance Technology for Growing System and Its Application to Tokyo Metropolitan Railway Network

Kazuo KERA  Keisuke BEKKI  Kazunori FUJIWARA  Keiji KAMIJYO  Fumio KITAHARA  

IEICE TRANSACTIONS on Information and Systems   Vol.E84-D   No.10   pp.1341-1349
Publication Date: 2001/10/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (IEICE/IEEE Joint Special Issue on Autonomous Decentralized Systems and Systems' Assurance)
Category: Railway System
autonomous decentralized system (ADS),  high assurance system,  assurance technology,  traffic management system,  

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System needs of growing systems including heterogeneous functions and operations are increased. High assurance system that achieves high reliability and high availability is very important for such systems. In order to realize high assurance system, we developed the assurance technology based on ADS (Autonomous Decentralized System). When a growing system changes or grows, its reliability may be lowered. In this paper, we clarify the risk factors which lower the reliability and quality of a growing system when the system is modified. We will then examine the technology to eliminate or mitigate those risk factors, and propose adaptive assurance technology that can minimize the risk. We also applied this technology to ATOS for Tokyo Metropolitan Railway Network as an example of really changing and growing system and mention its effectiveness. ATOS; Autonomous Decentralized Transport Operation Control System.