Shigeyuki Matsuda

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Web Services technologies are now an active research area. By integrating individual existing web systems the technology enables the provision of advanced and sophisticated services, such as allowing users to use different types of resources and services simultaneously in a simple procedure. However the management and maintenance of a large number of Web(More)
The specification of access control policies for large, multi-organization applications is difficult and error-prone. Sophisticated policies are needed for fine-grained control of access to large numbers of entities, resulting in many policies specified by different security administrators. Techniques such as role based access control (RBAC) have been(More)
The medical field has a requirement for ubiquitous computing with secure and reliable access control to permit patient information to be logged as they go about their normal activities or to permit medics to access patient information remotely from various mobile devices. Healthcare involves many different people from multiple organizations - general(More)
Web services have been common technologies for providing services over the Internet. In the future, it is expected that a usage model that autonomously integrates services will become ordinary in, for example, B2B integration. However, such method of executing pre-defined process lacks flexibility because a service requestor must know in advance the(More)