Hitachi, Ltd.

Setsuo Kawakami

Kinji Mori

Katsumi Kawano

Hirokazu Kasashima

Kozo Nakai

Shinji Hori

Minoru Koizumi

Masayuki Orimo

Yasuo Suzuki

Yoshiaki Ichikawa

Keisuke Shogano

Toshio Endo

An environmental information aggregating apparatus for transmitting information on an environmental aspect having a stratum structure to an external apparatus, includes: a storage unit for storing, in correspondence with an aspect identifier for identifying the environmental aspect, measured aspect information including a measured value of the environmental aspect and a measurement time, and transmission conversion information including a coefficient for converting a numerical value of the environmental aspect in accordance with a unit system of the external apparatus and an aspect identifier for identifying the environmental aspect at the external apparatus; and a calculating/processing unit for converting the measured value in the measured aspect information by using the coefficient in the transmission conversion information, generating aspect information including a conversion result value, the aspect identifier of the external apparatus in the transmission conversion information, and transmitting the generated aspect information to the external apparatus.

Environmental information aggregating apparatus and method

According to the present invention, a file recovery system is provided in which the commands for recovering files such as a historical file are unnecessitated and the recovery system configuration is independent of the host processing system. That is, since the equipment for achieving a file recovery does not have information about the location of the recovery data, information about the content of a file to be recovered is transmitted to a transmission line. The other equipments asynchronously receive the information and judges whether or not a file containing the same content exists in the own system. If its file exists, the content of the file is transmitted to the transmission line. The equipment achieving the file recovery asynchronously receives from the transmission line the file data of files such as a historical file and establishes data consistency by use of the buffered current data and the event number, thereby recovering files such as a historical file.

Method and apparatus for recovering data for a file in a plurality of equipments

A plurality of processors are connected to one another through a transmission line to constitute a distributed data processing system. Each processor adds a processor identification code to the time of its own and broadcasts them as time data at fixed periods. Each processor receives the time data on the transmission line, judges whether or not the received time data is the time data of the processor as the object of synchronization and sets the time data from the processor as the object of synchronization to the timer of its own system in order to synchronize the timers.

Method and apparatus for synchronization management of timers in

A message processing system has a common transmission medium and a plurality of processors or processing equipments connected to the common transmission medium. The processors process messages independenty from each other. Each processor adds information relating to an order of messages to a message resulting from processing by the processor and sends to resulting message to the common transmission medium. In accordance with the invention, a plurality of messages are readily identified.

System and method of message communication capable of checking

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Hitachi, Japan

Setsuo Kawakami