Abstract: Battery information output equipment allows a driver of an electric vehicle 10 of an electricity consumer 2, now parked, to input what battery capacity is required at two or more points of time on or before the time at which the electric vehicle is scheduled to come into use, considering an operation schedule for the vehicle, and transmits the usable capacity at each point of the times, i.e., maximum capacity minus capacity required at each point of the times, to a power supply/demand management center 3, so that charge and discharge of a battery 17 is controlled by a charge/discharge command from the power supply/demand management center 3 such that use of battery capacity for power supply and demand leveling is kept within the usable capacity at any point of the times.

Abstract: The invention judges a total power supply/demand condition of the electricity consumers 2 as a whole according to an individual power supply/demand condition of electricity consumers 2, judges a total usable capacity of all batteries 17 according to a usable capacity of the batteries 17 of electric vehicles 10 parked at electricity consumers 2, obtains required charge/discharge amounts of all the batteries 17 according to a result of comparison of the total power supply/demand condition of the electricity consumers 2 as a whole with the total usable capacity of all the batteries 17, subjects the batteries 17 to charge/discharge controls according to the required charge/discharge amounts, the power supply/demand conditions of the electricity consumers 2, and the usable capacities of the batteries.

Abstract: The invention judges a total power supply/demand condition of the electricity consumers 2 as a whole according to an individual power supply/demand condition of electricity consumers 2, judges a total usable capacity of all batteries 17 according to a usable capacity of the batteries 17 of electric vehicles 10 parked at electricity consumers 2, obtains required charge/discharge amounts of all the batteries 17 according to a result of comparison of the total power supply/demand condition of the electricity consumers 2 as a whole with the total usable capacity of all the batteries 17, subjects the batteries 17 to charge/discharge controls according to the required charge/discharge amounts, the power supply/demand conditions of the electricity consumers 2, and the usable capacities of the batteries.

Abstract: Battery information output equipment allows a driver of an electric vehicle 10 of an electricity consumer 2, now parked, to input what battery capacity is required at two or more points of time on or before the time at which the electric vehicle is scheduled to come into use, considering an operation schedule for the vehicle, and transmits the usable capacity at each point of the times, i.e., maximum capacity minus capacity required at each point of the times, to a power supply/demand management center 3, so that charge and discharge of a battery 17 is controlled by a charge/discharge command from the power supply/demand management center 3 such that use of battery capacity for power supply and demand leveling is kept within the usable capacity at any point of the times.

Abstract: It is an object to provide a method for invalidation and new registration of a storage medium, a method for backup of data stored in a storage medium and for restoration of backup data to a storage medium, and a method for encryption of and application of an electronic signature to data to be backed up, and for decryption of backup data to be restored and verification of a signature.

Abstract: It is aimed to prevent access to data when a storage device 1 is lost without damaging security and convenience of a user even if the storage device 1 is under condition in which communication with an authentication server is unavailable and further a personal identification number is leaked. The storage device 1 includes a data storing unit 11 which stores security target data and valid duration of use data showing a valid duration of use of the security target data and a validity checking unit 14 which implements a validity check process for checking if the security target data stored in the data storing unit 10 is valid based on the valid duration of use data stored in the data storing unit 10. Then, when the communication with the authentication server is unavailable, access to the data is controlled by implementing the validity check process.

Abstract: A method securely communicates data between members of a group of mobile devices using a wireless channel. The members include a group leader. Each member is associated with a physical token. Each member and associated token stores a binding key. Each member also stores an identification. A session key is stored by the group leader. Each token generates a member key, which is encrypted with the binding key and transmitted to the member where it is decrypted and stored. The session key is distributed securely to each member. Each member key is securely passed to the group leader. Then, data to be communicated between the group leader and a particular member can be encrypted using the using the associated member key of the particular member and the session key.

Abstract: A load distribution system includes a plurality of servers, each having a memory device in which are stored a plurality of data files for transmission to a plurality of client stations, and a control server which is connected to the plurality of servers for controlling the distribution of transmission requests from client stations as loads on the servers by acquiring transmission counts for data files that are transmitted by the plurality of servers, and determining which server should respond to a transmission request as a data transmission server based on which server has a transmitted data count which is the smallest.