Abstract: According to one embodiment, a radar device comprises a panel including clusters and a controller. The controller is configured to cause a first cluster of the clusters to transmit an electromagnetic wave to a target, cause the first cluster and at least one second cluster adjacent to the first cluster to receive a reflected wave from the target, and cause the first cluster and the at least one second cluster to output a reception signal. At least one cluster other than the first cluster and other than the at least one second cluster does not output the reception signal.

Abstract: A cache control method is provided which allows a cache state in a proxy server and a client use state to be synchronized and can improve a cache-efficiency regardless of time zones. A cache control method of a proxy server for relaying data between one or more clients connected to one communication network and a data server connected to the other communication network with a white list, includes the steps of determining whether or not a URL requested by a user of the client is registered in a white list, and processing data at the URL to be cached if the URL is registered in the white list.

Abstract: Provided are a data relay apparatus that can prevent relevant data from being infected with a computer Virus while the Internet user is unaware of that and a method for that data relay apparatus.

Abstract: There is provided a URL information sharing system capable of controlling a cache or a log every arbitrary client group, sharing URL information by automatically generating a URL link collection needed in the group, and conducting self-imposed control on reading of information causing a harmful influence.