Toshio Tonouchi

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The management of policies in large-scale systems is complex because of the potentially large number of policies and administrators, as well as the diverse types of information that need to be managed. Appropriate tool support is essential to make management practical and feasible. In this paper we present the implementation of an integrated toolkit for the(More)
The paper presents a survey on OpenFlow related technologies that have been proposed as a means for researchers, network service creators, and others to easily design, test, and deploy their innovative ideas in experimental or production networks to accelerate research activities on network technologies. Rather than having programmability within each(More)
Low-cost implementations of graphical user interfaces (GUIs) have relied on the widget library framework. Although conventional widgets are suitable for developing typical GUIs with predetermined interaction styles, application-speci c customization of interactions is rather di cult, especially for a nonprogrammer. Instead, we propose a new framework(More)
A key challenge of ubiquitous computing environments, which feature massively distributed systems containing a large number of contexts and services, is how to manage the relations between context and service. Some researchers use rules to describe these relations, while other researchers propose stochastic methods to model them. However, both approaches(More)
A policy management technology is one of promising technologies for the management of networking systems, which are getting complex and difficult to manage. Conventional policy languages provide a flat policy mechanism, under which all policy rules are always active. We argue that not all policy rules should be active in all situations. Some are defined for(More)
In ubiquitous networks, a lot of sensors and RFID readers will be connected to the networks as well as PCs and mobile phones are connected, and huge numbers of transactions are expected to be issued by these devices. Since the loads caused by the transactions are getting increased gradually, it is difficult for system manager to estimate the required(More)
It is a tough job for operators to make perfectly accurate configuration of many network elements in large networks. Erroneous configurations may cause critical incidents in network, on which many ICT systems are running. It may also result in a security hole as well as system incidents. There has been much work on preventing erroneous configurations, but(More)