Shinya Kitajima

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In mobile sensor networks with a small number of nodes, because nodes' radio communication range does not cover the whole sensing area, every node has to move closer to the data sink to deliver its sensed data. Thus, the power consumption to deliver the sensed data to the data sink becomes large. In this paper, we propose two novel methods that nodes(More)
In recent years, there has been an increasing interest in the broadcast database system, where the server periodically broadcasts contents of a database to mobile clients such as PDAs. There are three query processing methods in the broadcast database system: (i) the server processes a query and then broadcasts the query result to the client; (ii) the(More)
Advances in wireless communication technology have led to an increasing interest in mobile sensor networks.In our previous work, we proposed a method that controls the movement of sensor nodes by using push-based broadcast and communication among nodes.In this method, nodes autonomously move based on the broadcast information on where they can communicate(More)
Recent spread of various data broadcasting services leads to provide enormous and various data. Since, data that a client needs are a part of them, there has been an increasing interest in information filtering techniques where a  client automatically chooses and stores the necessary data. Generally, when a client performs filtering, it applies(More)
In recent years, there has been an increasing interest in a broadcast database system where the server periodically broadcasts contents of a database to mobile clients such as PDAs and smart phones. There are three query processing methods in the broadcast database system. Generally, mobile clients have limits in energy consumption, i.e., battery,and each(More)
Generally, the automation operations for cloud management achieved by replacing manual operations with operations using automation tools. The developers of automation scripts often refer to the existing automation scripts so that they can develop new automation scripts by just modifying smaller parts in the existing automation scripts. In order to(More)
Virtualization technologies in a cloud computing system enable its users to create and delete virtual machines easily. This flexibility accelerates the update cycle of applications to keep up with user demand. When updating applications, the application management process should also be modified. If necessary changes in the management process are(More)
In recent years, there has been an increasing interest in sensor networks, in which sensor nodes such as temperature or humidity sensors communicate with each other for environmental monitoring and so on. In sensor networks, it is important to reduce the energy consumption, since sensor nodes have limits in battery. Most researches achieve this by reducing(More)