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Autonomous decentralized system (ADS) architecture has been used to construct high assurance control systems like infrastructure systems. Such systems have to be expanded these functions to meet new demands of service. In that case, the method which can be used for the system expansion without any bad influence to the online systems is essential. In this paper, we clarify that a new system expansion...
Railway transportation is required to serve without rest every day. In Japan trains and platforms are terribly crowded every morning and evening, so that the Automatic Fare Collection (AFC) Systems need high performance. On the other hand, the systems need high reliability since the tickets they process are equivalent to cash. This paper introduces Autonomous Cooperative Processing Technology for...
A main goal of a Public Key Infrastructure (PKI) is the management of digital certificates in order to bind public keys with respective user identities assuring the uniqueness of these public keys. A PKI must guarantee the reliability of its services, assuring the timeliness of its responses and the continuity of the service despite of the growth in the number of users and the presence of hardware...
This contribution is rather different from the other articles we're run in this department to date. Here, software volume isn't an issue as there is only one Tokyo-instead, we look at the incremental development of a network of systems controlling railway lines, which requires adding value without disruption. This particular scenario contains many interesting facets, including the use of COTS and...
Both high performance and high reliability are necessary for the automatic fare collection system. The IC card ticket system, developed in order to improve the passengers' satisfaction and to reduce the maintenance costs, cannot avoid the requirements, either. However, this new system has a problem; high performance on wireless communications lowers reliability. The solutions are the "autonomous...
Ubiquitous computing is characterized by an extremely diverse set of infrastructure platforms. The market and users requirements have been rapidly changing and diversified. Such evolving situations make constructing large-scale wide-area ubiquitous computing environment extremely difficult. The autonomous decentralized system (ADS) has been proposed for resolving the on-line property to achieve the...
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