Nec Corporation

Naoto Ogura

Yukihide Yoda

Yoshiaki Aono

Tadayuki Iwano

Koyo Mori

Hideaki Takeda

Takakazu Namera

Hiroaki Koshio

Motohito Ebihara

A deterioration discrimination system according to the present disclosure includes: an optical fiber cable () configured to be laid in a utility pole (); a communication unit () configured to receive an optical signal from optical fibers () included in the optical fiber cable (); a detection unit () configured to detect, based on the optical signal received by the communication unit (), vibrations that are generated in the utility pole (); and a discrimination unit () configured to discriminate, based on a vibration frequency of the vibrations that are generated during a specified period among the vibrations that are detected by the detection unit (), deterioration of the utility pole ().

Utility pole deterioration discrimination device and method

In order to provide a detection device that is capable of detecting the submersion of a fiber-optic cable in water before water penetrates the interior of the fiber-optic cable, a detection systemcomprises: a vibration-detecting fiber-optic cable; a receiving meansthat receives an optical signal including vibrations detected by the fiber-optic cable; and a detection meansthat detects submersion of the fiber-optic cable in water on the basis of the vibrations included in the optical signal.

Detection system, detection device, and detection method

An optical fiber sensing system and method assessing that an abnormality has occurred when a vibration pattern of an optical signal output from an optical fiber, that detects a vibration, is not already known. When the vibration pattern of the optical signal has not occurred in accordance with a predetermined event, and the vibration pattern is an abnormal vibration pattern, assessing that the abnormality has occurred at a position at which the optical fiber detected the vibration.

Abnormality assessment device using optical fiber sensing system

An optical fiber sensing system according to the present disclosure comprises: an optical fiber () that is laid in a pipe (); a reception unit () configured to receive, from the optical fiber (), an optical signal superimposed with vibration detected by the optical fiber (); and an assessment unit () configured to extract a vibration pattern of the vibration detected by the optical fiber () from the optical signal and determine the degradation state of the pipe () based on the extracted vibration pattern.

Optical fiber sensing system, optical fiber sensing device, and method for detecting pipe deterioration

A method of detecting removal of a maintenance hatch includes transmitting an optical pulse along an optical fiber, wherein a first portion of the optical fiber is proximate to the maintenance hatch. The method further includes detecting backscatter light from the optical fiber using a sensor. The method further includes determining information related to the first portion of the optical fiber based on a comparison of the detected backscatter light and a trained model. The method further includes identifying whether the maintenance hatch has been removed based on the determined information.

System for identifying removal of maintenance hatch and method of using

A representative line card in a switch system that is configured of a layer 2 switching processor and a plurality of line cards connected to the layer 2 switching processor, the plurality of line cards including at least one representative line card, comprising: an FDB table having FDB information entried therein, and; a learning unit that receives a learning notification including the FDB information from the other line cards excluding its own line card via the layer 2 switching processor, determines whether the FDB information of the learning notification has been entried into the FDB table of its own line card, updates the FDB table of its own line card when the FDB information has not been entried, and transmits the learning notification including the FDB information to the other line cards via the layer 2 switching processor with a multicast.

Switch system, line card and learning method of FDB information

An IP (Internet Protocol) telephone system according to the present invention is an IP telephone system including an IP telephone terminal communicating with an opposite party using SIP (Session Initiation Protocol), and a network device transferring a packet from the IP telephone terminal, wherein the IP telephone terminal includes a CPU (Central Processing Unit) transmitting an SIP packet indicating an e-mail address related to a telephone number of the opposite party when the terminal resides in a non-disaster area and calls the opposite party in a disaster area with a disaster mode being set, and the network device includes an SIP packet processing part terminating an SIP packet whose destination is an e-mail address, an e-mail creation part converting a voice packet of RTP (Real Time Protocol) from the IP telephone terminal into text data and creating an e-mail, and a packet transmitting part transmitting the e-mail to the opposite party.

IP telephone system, network device, communication method in disaster situations used therefor and IP telephone terminal

A system for controlling the orbit of a satellite by operating a plurality of thrusters is disclosed. In the system, an actual attitude of the satellite is sensed, an evaluation is set up on the basis of the sensed attitude and compared with a threshold which is adequately changing, and the ON-OFF condition of the firing of the thrusters is based on the relationship between the evaluation value and the threshold.

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Tokyo, Japan

Naoto Ogura