Hitachi, Ltd.

Yusuke Hino

Kazuo Takaragi

Hiroshi Yoshiura

Hisashi Hashimoto

Yutaka Otsu

Masayuki Orimo

Satoshi Kikuchi

Keiichi Nakane

Shigeki Hirasawa

Hideaki Gemma

Hiromichi Ito

Hiroshi Fujise

Kimitoshi Yamada

Nobuyoshi Andou

Eisaku Nishiyama

Toshiharu Iwata

Tohru Horimoto

Yuzi Suzuki

An information processing system including a data input means ( ) for inputting or receiving data, a data compressing means ( ) for compressing the data, a decompressing means ( ) for decompressing the compressed data and a main storage ( ) is provided with an encrypting means ( ) for encrypting the data and a decrypting means (220) for decrypting the encrypted data. In execution of a compression/encryption step in which the compressing means ( ) and the encrypting means ( ) perform compression and encryption for a part of the data and a decryption/decompression step in which the decompressing means ( ) and the decrypting means ( ) perform decompression and decryption for a part of the compressed and encrypted data, amounts of series of data processed in the compression/encryption and decryption/decompression steps are so set that a memory capacity required for executing the processings does not exceed capacity of the main storage, wherein the compression/encryption and decryption/decompression steps are repeated more than once inclusive.

Data decompression/decryption method and system

Data compression/encryption method and system

An information processing system and a communication method performed in the information processing system for performing data transmission effectively. The information processing system includes a plurality of information processing apparatuses and a communication line for interconnecting the plurality of information processing apparatuses. A sending information processing apparatus, when sending information to the plurality of information processing apparatuses, sends transmission information to one of the plurality of information processing apparatuses. The one information processing apparatus sends the received transmission information to the other information processing apparatuses of the plurality of information processing apparatuses.

Method and apparatus for providing communication between grouped

A database access system for a distributed system, in which the database access load is distributed among a plurality of gateways, and an arbitrary character code set can be used for database access. After the lapse of a predetermined time length, processings for particular database access are terminated. An error of a DBMS or a component on the gateway is detected by a client. The gateway detects an error of the client in connection. The client notifies the character code set identification information of the character code used for outputting the request to the gateway, and the gateway converts the character code for the request and a response to the client. The gateway receives an access request, secures the connection with a database access language conversion unit, and sends the language converted to a DBMS. In the absence of a response after the lapse of a predetermined time length, the connection with the database access language conversion unit is terminated and an error is notified to the client. Also, an error monitor request is outputted at regular intervals of time, and an error is notified to the client in the case where there is no response to the error monitor request after the lapse of a predetermined time length.

Database access system and method of controlling access management to a

A composite loop communication network formed by combining a plurality of loop communication paths each provided with terminals with one another through a plurality of loop coupling devices so as to form a loop, is disclosed in which one of the terminals of each loop communication path is used as a management terminal, the management terminal of a loop communication path sets routing information on the communication between the loop communication path and a loop communication path adjacent thereto in a loop coupling device, and the loop coupling device selectively takes in data flowing through the former loop communication path, on the basis of the above routing information, to send the data from the loop coupling device to the latter loop communication path, thereby making possible the communication between terminals of different loop communication paths.

Method and system for loop communication

An information output system includes a display unit and a printer for visibly outputting data has a control unit for controlling these units. In each display unit or printer, the outputted data is controlled by an arbitrary mode among a plurality of predetermined modes concerning the data display format. For this purpose, the control unit includes a rewritable table for specifying the number of data to be outputted, i.e., the picture size for each unit. If a picture size mode is specified corresponding to a unit, that unit visibly outputs the data according to its picture size mode. Also, in the case where the contents displayed on a display unit are to be printed on a printer to yield a hard copy, it is possible to print the contents with the picture size mode of the printer matched to that of the display unit by referencing the rewritable table.

Information output system having controlled data formatting for each

Growing community of inventors

Hadano, Japan

Yusuke Hino