Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Hitachi Electronics Services Co. Ltd.

Masahiko Ishimaru

Toshio Hirosawa

Yoshikazu Ichikawa

Shigeru Sasaki

Atsushi Ueoka

Kazuyuki Nakamura

Motohide Kokunishi

Tadashi Yamagishi

Fujio Fujita

Michio Hirano

Kaoru Kozuma

Hideki Namba

Toshimitsu Kaku

Tsuyoshi Toda

Hitoshi Ueno

Jun'ichi Kurihara

Tutomu Itoh

Ikuo Kimura

Akira Ando

Tsutomu Itoh

Masaaki Hama

Kozi Miyazima

Yoshimasa Yamamoto

Tutomo Itoh

A recording/reproducing apparatus includes a laser for generating laser light to be used for recording/reproducing information onto/from a recording medium, a beam splitter for separating a luminous flux for a monitor, a photodetector for receiving the luminous flux, a power control circuit for keeping an average output of the laser at a predetermined value, a high-frequency adding circuit for applying high-frequency modulation to the laser, and a controller for altering the degree of modulation of the high-frequency modulation. When the average output of the laser is kept constant by the power control circuit, the degree of modulation conducted by the high-frequency adding circuit is altered, the light emitting power (bottom power) subjected to no high-frequency modulation being thus controlled.

Optical information recording and reproducing control apparatus and

An optical disk recording control apparatus includes a judgment circuit for judging a modulation system of user information in accordance with identification information possessed by the optical disk and outputting a control signal concerning the modulation system, a test write pattern generating circuit for generating a test write pattern constituted by the densest and sparsest patterns correspondingly to the code configuration of the identified modulation system, a test write pulse recording circuit for generating a test write pulse string from the test write pattern and recording the test write pulse string in a predetermined zone of the optical disk, an optimum recording power calculation circuit for obtaining optimum recording power for the predetermined zone on the basis of a densest pattern waveform and a sparsest pattern waveform so that the zero level of the densest pattern waveform coincides with the zero level of the sparsest pattern waveform in the test write pulse string recorded in the predetermined zone, and a user information recording circuit for recording the user information into each zone of the optical disk correspondingly to the obtained optimum recording power in accordance with the modulation system, whereby the different modulation system test writing is performed in accordance with the identification information possessed by the optical disk and then the user information is recorded into the optical disk.

Optical disk recording control method and apparatus for recording user

In an electronic mail associated type computer system network equipped with a computer system for executing a job and a general-purpose electronic mail system, a user of an electronic mail can freely recognize a condition of an execution result of a job performed in the computer system and a job execution result. Also, these results are available from a desired output device for the user. When a mail processing unit employed in the computer system analyzes a mail statement about the job execution derived from the electronic mail system, and the job execution is completed, this mail processing unit sends to the electronic mail system, such a mail statement for the completion of the job execution containing information about fail/safe execution result. Upon receipt of this report, the user designates the output device into a response mail so as to output the job execution result from the designated output device.

Computer system and job transfer method using electronic mail system

In an arrangement of a mail terminal 1, an electronic mail system 2, a job control terminal 4, and a computer system 3, a user makes a proposal of a file operation via a mail by way of the mail terminal 1. The electronic mail system 2 stores therein the proposal mail, exchanges this proposal mail with the job control terminal 4, and furthermore distributes a file operation result to the respective mail terminals. The job control terminal 4 receives a mail from the electronic mail system 2, and interprets the proposal mail, thereby executing a conversion from a mail ID into a host ID, a judgement of an access authorization with respect to the designated file, and a production of an instruction to the computer process system 3. Furthermore, an execution host computer is selected by monitoring operation conditions of the host computers. When the file operation result is sent from the computer process system 3, a mail containing this file operation result is produced, and the resultant mail is sent to the electronic mail system 2. The computer system 3 interprets a command issued from the job control terminal 4, thereby executing a reading operation from the designated file, a writing operation to the designated file, and a reading operation of a file name list.

Electronic mail drive type computer system and file operation method

An automatic operation control system for controlling the automatic operation of a computer system, stores in a storage unit the status informations of hardware configuration and software configuration of a computer system, a running event of the operating system and application programs, and an operation event of the computer system, and supplies a procedure for an operation command to be executed in accordance with the configuration information and the occurred event.

Operation control technique for computer system by driving a command

A job control terminal creates a unit configuration table indicating the configuration of units connected to each of a plurality of processors in a multi-processor system. The job control terminal also creates an operating state table indicating an operating state of each processor including a CPU using ratio, I/O using ratio, memory using ratio, response time, and so on. When the job control terminal receives electronic mail for requesting job execution from a user through an electronic mail terminal, the job control terminal selects a processor assigned to execute the requested job based on the unit configuration table and the operating state table. When it is determined from the states of the processors that the requested job cannot be executed, information indicating that the job is unacceptable is transmitted from the job control terminal to the electronic mail terminal.

Method and apparatus for having a processor execute a job utilizing an

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Fujisawa, Japan

Masahiko Ishimaru