Hitachi, Ltd.

Hitachi Process Computer Engineering, Inc.

Hideki Tonooka

Yoshiaki Adachi

Takuma Nishimura

Atsushi Matsuno

Hisao Kikuchi

Kei Takezawa

Kiyokazu Tamura

Hiroaki Nakanishi

Hiroshi Wataya

Isao Terakado

Tsutomu Onuki

Kenji Matsuzaki

Keijiro Hayashi

A virus detection system uses a USB relay device that can support not only the use of USB mass storage but also the use of other USB devices such as a mouse. The USB relay device has a connection switching unit for switching a connection state between a first connector unit to which a USB client is connected and a second connector unit connected to a USB host controller. The virus detection system includes a virus check engine unit that performs a virus check of a file acquired from the USB client or the USB host controller via the USB relay device. On the basis of a result of the check by the virus check engine unit, the USB relay device performs switching control of the connection state by the connection switching unit.

Virus detection system and virus detection method using USB relay device

A USB management system using a USB relay device includes a management terminal having a management database for recording management information of a USB client registered in advance. The USB relay device has a connection switching unit for switching a connection state between a first connector portion to which the USB client is connected and a second connector portion which is connected to a USB host controller. When the USB client is connected to the first connector portion, the USB relay device reads management information of the USB client and transmits the management information to the management terminal, and the management terminal inquires of the management database about the management information of the USB client transmitted from the USB relay device, compares the management information with the management information of the USB client registered in advance, and determines the connection state by the connection switching unit.

USB management system and USB management method using USB relay device

A network system has a plurality of nodes being operated by their communication application programs. In the network system, each of the nodes includes a transmission rate control module for obtaining a communication attribute required for controlling a communication band from the communication application program, a band information managing table for storing the obtained communication attribute, a band information transmitting module for delivering the band information of the local node to all the other nodes connected with the network, a band information receiving module for receiving the band information delivered by the band information transmitting module of another node and storing the band information in the band information managing table. The transmission rate control module is served to obtain the current band traffic on the basis of the band information stored in the band information managing table and perform the band control.

Network system and communication band control method thereof

There is disclosed an information processing system and method capable of coping with a wider range of subjects and intricate changes. In client server structure, time-varying database altering information received from external systems is pooled in servers and distributed to a number of distributed terminals or clients, using broadcasting communication.

Information processing system and method using time-varying database

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Hitachi, Japan

Hideki Tonooka