Hitachi, Ltd.

Hitachi Information Technology Co., Ltd.

Yukihiro Takatani

Naomichi Nonaka

Minoru Koizumi

Masatoshi Kumagai

Masato Hayashi

Kenichiro Yamane

Shota Omi

A system stabilization system () is provided with: at least one of a power flow state database (DB) and a system configuration database (DB); a device state database (DB) in which the device states of a stabilizing device are recorded; a stabilizing effect index calculation function () for indexing the stabilizing effect of the stabilizing device on the basis of a device state and one or both of a power flow state and a system configuration; and a display means for displaying or outputting a stabilizing effect index obtained by the stabilizing effect index calculation function, in contrast with contrasted elements included in the device state, the power flow state, and the system configuration.

Power system stabilization system

A GSM network () includes a base station (). A first mobile terminal () is outside a region of coverage. Using Bluetooth network, a second terminal () relays signals between the first terminal and the base station. The second terminal is awarded credit for relaying the signals.

Mobile communication network using mobile station with relay-function and method for rewarding relay activities of mobile station

A system for use with communications according to TCP, or a similar protocol, includes a sender host, one or more routers, and a destination host. Each router includes means for generating acknowledgement packets and translating addresses associated with data packets. When a data packet is received by a router, an acknowledgement packet is returned with a source address corresponding to the router and a destination address corresponding to the sender host. The sender host perceives the acknowledgement packet as having been sent by the destination host. As the acknowledgment packet is sent by the router, and not the destination packet is sent by the router, and not the destination host, this system allows acknowledgment packets to be received on a shorter timescale, reducing the effects of a link delay. Although the route between the sender host and the destination host is divided into multiple connections, the hosts perceive a single, conventional connection.

Performance enhanced TCP communication system

Growing community of inventors

Tokyo, Japan

Yukihiro Takatani