Nec Corporation

Koyo Mori

Yukihide Yoda

Tadayuki Iwano

Naoto Ogura

A specifying system according to the present disclosure includes an optical fiber () laid along a levee () of a river (), a communication unit () configured to receive, from the optical fiber (), an optical signal containing a pattern that changes according to a state of the levee (), and a specifying unit () configured to specify a water level of the river () based on the pattern that changes according to the state of the levee ().

Specifying system, specifying apparatus, and specifying method

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.

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Tokyo, Japan

Koyo Mori