Hitachi, Ltd.

Hitachi Koki Co., Ltd.

Kenji Kataoka

Koji Sonoda

Shinki Ohtsu

Yoji Nakatani

Hideki Watanabe

Shigeru Ishikawa

Minoru Koizumi

Kazuhiro Kusama

Takuma Saito

Kazuhide Ohzeki

Yasumichi Nonaka

Jyunichi Toukairin

Kota Kawahara

Koji Suzuki

Susumu Saito

Kazuo Takaragi

Masato Sakai

Daisuke Matsubara

Ryoichi Sasaki

Osamu Takada

Tsutomu Nakamura

Yasuko Fukuzawa

Tetsuhiko Hirata

Hitoshi Tsuzuki

Hitoshi Yabusaki

Kunihiro Okada

Akihiro Kamiya

Yukio Terunuma

Junichi Tokairin

Hirohide Endo

Nobuhisa Sugawara

Emiko Yanagisawa

Hitoshi Ihara

Hirashi Wataya

When a path which is a network communication path is calculated, the amount of path calculation is reduced while satisfying the requirement of the path. The network is logically divided into a plurality of calculation domains, and the divided calculation domains are hierarchically managed, and the path attribute of a path within the calculation domain of a lower hierarchical layer is held as a link attribute of an abstract link of a higher hierarchical layer.

Path calculation method

A vibration drill unit capable of obtaining an intensive drilling force. The vibration drill unit includes a first ratchet, anon-rotatable second ratchet having a claw engageable with the claw of the first ratchet, and a main body frame for accommodating a motor, a spindle, the first ratchet and the second ratchet. The respective claws of the first ratchet and the second ratchet include the first inclined surfaces formed so as to be engaged in the rotation direction by rotations of the first ratchet and so as to be separated from each other, the second inclined surfaces having greater inclination in the reversed direction than the first inclined surfaces, top parts that link the upper parts of both inclined surfaces to each other, and flat parts that link the bottom parts of both inclined surfaces to each other.

Vibration drill unit

In a packet transport network, to determine a path route in which a bottleneck does not occur with a small amount of calculation, provided is a network system, including data transfer devices and a management computer, each of the data transfer devices including IFs, in which the management computer is configured to: store remaining bandwidth information on the each of the IFs; select one of bandwidths; judge, based on the remaining bandwidth information and the selected bandwidth, whether or not the each of the IFs is usable; determine a route candidate though which data is transferred, bypassing the each of the IFs which has been judged to be unusable; judge, based on the remaining bandwidth information, whether or not continuity of the IF through which the route candidate passes is possible; and allocate the route candidate, the continuity of which is possible, to a new path.

Network system, management computer, and bandwidth management method

An arithmetic operation portion including a swap arithmetic operation portion which performs an arithmetic operation of swap information concerned with a path route of a packet, and a label processing portion which sets adjustment of a first label based on a result of the arithmetic operation executed by the swap arithmetic operation portion is provided in a control apparatus to thereby attain compatibility between dispersion of packet transfer load and reduction of an error rate in each link.

Control apparatus

In a cluster type NAS, it is necessary to copy file data between disk devices of servers upon migration of a file system or a part of the file system. A server includes a control table for managing a file system or a part of the file system, and a mapping table for managing a relation between a logical device of a disk subsystem and a logical unit recognized by a server, and in response to an instruction to execute migration of the file system from a first server to a second server, the mapping table is referenced to send an instruction to update the relation between the logical device and the logical unit to the second server, and the second server newly recognizes a logical unit and updates a management server identifier of the control table.

File system migration in storage system

In generation of an MPLS path which extends over plural routing areas or generation of a GMPLS path of a single routing area, a path originating node cannot conduct route computation of the whole path. Therefore, where plural paths are generated, there is a problem that reliability and communication quality cannot be secured. In a label switch path generation processing intended for MPLS and GMPLS networks, a path originating node is provided with a unit for setting restricted link information in a label allocation request message and sending it, and a node having received the label allocation request message is provided with a unit for selecting another route, which does not pass through the restricted link according to the restricted link information, and generating a path.

Route control method of label switch path

A computer system for managing log information, enabling correct comprehension of system logs for an identical resource before and after migration among plural nodes. A global ID, being unique in the system, is given to a resource (LU) migrated from one file share server to another. The global ID remains the same in the migration destination file share server after migration and log messages for the resource are obtained based on the global ID.

Computer system and method for managing log information

An impact drill for boring a workpiece includes a main frame, a motor housed in the main frame, a spindle movably supported by the main frame and rotatable by the motor and movable in its axial direction, a first ratchet positioned fixedly with respect to the spindle, a second ratchet positioned with respect to the first ratchet, a spring biasing the second ratchet toward the first ratchet. The spring has at least one of a spring constant and a biasing force which prevents the second ratchet and the spindle from abutting against the main frame at least one of when a force ranging from 15 to 25 kg is applied to the main frame for boring the workpiece and when the spindle is moved to a retracted position.

Impact drill

An impact drill minimizing transmission of vibration to a handle gripped by a user's hand. A spindle extends through a main frame and is movable in its axial direction and rotatable about its axis. A first ratchet is rotatable and axially movable together with the spindle. A second ratchet is axially movable but unrotatable. In an impact drilling mode, the first ratchet is brought into abutment with the second ratchet so that the spindle is reciprocally moved in the axial direction.

Portable electric drill

A distributed memory computer system periodically performs memory copy among a plurality of computers by using general-purpose communication control devices and a transmission line of the CSMA/CD type. A master computer periodically generates a synchronizing packet, and transmits data for memory copy and normal data in a time slot immediately after the transmission of the synchronizing packet. Each computer other than the master computer transmits the data for memory copy and the normal data in its own time slot after the elapse of a predetermined time. The respective computers complete their transmissions within predetermined times. Since the time slots are assigned to the respective computers, the number of computers which may compete with each other on a transmission line can be restricted and each computer can be assured a periodic opportunity to transmit data.

Method and system for sequentially broadcasting data according to

An information service system including a plurality of receiving stations and information service facilities. The information service facilities include a memory circuit which stores beforehand a distribution destination information set of receiving station identifiers allocated to the receiving stations, distribution destination information set being disposed in a predetermined order within the memory circuit, a memory circuit for storing a plurality of information to be supplied to receiving stations, an enciphering circuit for generating an enciphering key for optical receiving stations within a group which performs broadcast communications, and enciphering the service information with the enciphering key, and a circuit for transmitting the enciphered service information and service destination codes of service destination receiving stations encoded from the distribution destination information set, through broadcast communications. Each receiving station includes a memory circuit for storing beforehand its own identifier and the distribution destination information set of the group which performs broadcast communications, a receiver unit for receiving the enciphered service information and the service destination codes from the information service facilities, and a deciphering circuit for generating a deciphering key corresponding to the distribution destination information set in accordance with the received service destination codes and the corresponding, and previously stored distribution destination information, only when the own identifier of the receiving station is contained in the service destination codes, and the deciphering the enciphered service information with the deciphering key.

Secret information service system and method

An optical input and output device which includes laser beam generating means, a photo-conductive drum to be formed with an electrolatent image according to the intensity of a laser beam, scanning means for simultaneously deflecting and distributing the laser beam between the surface of a sheet of paper written with a picture image to be received and the surface of the photo-conductive drum to irradiate and linearly scan the respective surfaces, and photoelectric converting means made receptive of the laser beam reflected from the paper surface thereby to convert it into an electric signal.

Optical input and output scanning system

Growing community of inventors

Yokohama, Japan

Kenji Kataoka