Nec Corporation

Tohoku University

Other

Masafumi Yano

Yuma Matsuda

Masatsugu Ogawa

Akihiro Tanaka

Tomoyuki Hino

Atsuhiro Tanaka

Hiroto Sugahara

Junpei Kamimura

Hisaya Wakayama

Susumu Kawakami

In order to facilitate accuracy improvement in identification of a position of vibration on a road caused by a vehicle and detected through an optical cable, this distance correction device: derives, from vibration data for each optical fiber distance detected through an optical fiber installed along the road on which the vehicle travels, a first vibration value indicating the magnitude of vibration within a prescribed frequency range for the optical fiber distance; derives, from the first vibration value, a bridge optical fiber distance which is an optical fiber distance to a prescribed position of the optical fiber installed at a bridge; and corrects, from the bridge optical fiber distance and a road distance which is a distance, along the road, from a reference point to a bridge optical fiber position, the optical distance within a prescribed range so as to be closer to the road distance.

Distance correction device, processing device, sensor device, distance correction method, and recording medium

To improve the accuracy of vehicle speed calculation, the present disclosure extracts, on the basis of an optical signal received from an optical fiber cable laid in a road, a first pattern according to the traveling state of a vehicle on the road in a first time range and a first distance range, generates, on the basis of the first pattern, a second pattern in which the number of time points included in the first time range or the number of positions included in the first distance range has been decreased, and calculates the traveling speed of the vehicle on the road on the basis of the second pattern.

Road monitoring system, road monitoring device, and road monitoring method

A position detection device includes a transmitter that transmits an optical pulse into an optical transmission line laid along the movement path of a moving body; a detector that detects back-scattered light in the optical transmission line; a data processor that calculates the intensity of the back-scattered light and the generation position of the back-scattered light; a storage in which the processing results of the data processor are saved; a search range derivation circuit that derives a search range for the position of the moving body; a maximum value extraction circuit that extracts the generation position at which the variation of intensity within the search range is at a maximum, and causes the extracted generation position to be saved in the storage; and an output circuit that outputs the extraction result.

Position detection device and position detection method

A receiver comprises: optical signal distributing means for distributing an optical signal transmitted to detect a detection target on a traveling path to two or more paths; a detection unit configured to detect a received light intensity of the optical signal at a first position where the received light intensity increases when the optical axis is shifted and at a second position where the received light intensity decreases; an intensity ratio calculation unit configured to calculate a ratio between the received light intensity at the first position and the second position based on the output of the detection unit; and a determination unit configured to determine whether or not there is an optical axis shift based on a change in the ratio of the received light intensity calculated by the intensity ratio calculation unit.

Receiver, detection system, and detection method

A detection unit receives an optical signal that has passed through a space to be measured. A spectrum extraction unit extracts a range to be measured from the optical signal received by the detection unit. The spectrum extraction unit extracts an optical signal formed as a gas molecule of a gas to be measured absorbs energy of the optical signal. A determination unit determines the presence of an anomaly in the space to be measured based on a waveform of the optical signal extracted by the spectrum extraction unit.

Receiver, early anomaly detection system and method, and computer-readable medium

A receiver () according to the present disclosure includes: a detection unit () including a sensor configured to receive a first optical signal of a wavelength included in an absorption band of water molecules and a second optical signal of a wavelength included in an absorption band of carbon dioxide molecules, a signal processing unit () configured to calculate a water vapor concentration and a carbon dioxide concentration from changes of intensities of the first and second optical signals, and a determination unit () configured to determine whether or not there is a fire that is caused by alcohol combustion based on the water vapor concentration and the carbon dioxide concentration.

Receiver, fire detection system, and fire detection method

Provided is a system including a plurality of correlated function blocks, for executing load balancing among the function blocks. The plurality of function blocks each include an activation/shutdown control unit to determine whether to activate/shut down its own function block based on information of an evaluation function of its own function block and information of an evaluation function of another function block that has a relation to its own function block, and the activation/shutdown control unit determines whether to activate/shut down its own function block by using an amount relevant to the evaluation function of its own function block in a state where the evaluation function of its own function block takes a desired value, and using a state of the evaluation function of the another function block having a relation to its own function block that is equivalent to, or related to, the relevant amount.

Control method for distributed autonomous system and distributed autonomous system

A delay tolerant network is built with the use of a plurality of information transfer devices each of which includes: a communication unit to communicate to and from another device within a communication range that is connected to the information transfer device; and a storing unit to store and keeps collected notification information, and each of which holds delay tolerant communication by exchanging the collected and kept notification information with another device when the exchange becomes possible. Each information transfer device includes a control unit to exchange environment information with another information transfer device, and to execute deriving processing an assigned range that is assigned autonomously to its own information transfer device, based on the environment information that is kept by its own information transfer device, through a planarization search processing in which a value is evened out between its own information transfer device and other information transfer devices.

Information transfer device, delay tolerant network, information transmission method, and recording medium

An object is to provide a system in which components can overall operate in concert with one another by using only functions about the components, without using the theory of probability. The system includes a plurality of function blocks correlated to one another. The plurality of function blocks each include: a storing unit including an evaluation function that is associated with its own function block; a profit maximization control unit for adjusting the operation level of its own function block by information about the evaluation function of another of the plurality of function blocks that has a relation with its own function block; an activation/shutdown problem solution control unit for adjusting a suppression of the operation level by profit maximization control based on an active state/shutdown state of its own function block; and a restraint condition fulfillment control unit for adjusting the operation level of its own function block based on a restraint condition that is to be fulfilled by its own function block and all of the plurality of function blocks together.

Distributed autonomous system and method for controlling distributed autonomous system

An information representation method for representing an object or a shape includes: dividing a contour shape of an entirety or a part of the object or the shape into one or a plurality of curves; and representing the contour shape of the object or the shape by parameters including a degree of curvature and a positional relationship of each curve obtained by the dividing. Therefore, there is provided an information representation method for an object or a shape, which is capable of robust object recognition against a change in image by geometric transformations and occlusions.

Object or shape information representation method

A start node acquires coupled state information indicating a connectibility of nodes from a network. By executing simulation in accordance with a computational model constructed based on the coupled state information, the start node determines for each node a first link that transmitted an oscillation or a signal first to the node. A path that extends from a target node to the start node via the first link of intermediate nodes is selected.

Path selection device, program and method

Disclosed are a radio wave propagation characteristic estimation system, radio wave propagation characteristic estimation method, and radio wave propagation characteristic estimation program for estimating propagation characteristics of radio waves at high speeds, without deteriorating accuracy. An object selection module reads map data prerecorded on a map data memory unit and selects structures from the structures indicated in structure data included in the map data according to the height thereof, a radio wave propagation path calculation module searches for the path of radio waves emitted from a transmission point based on the structure data related to the selected structures and location data for the transmission point and an observation point, and calculates the propagation path of the radio waves until the radio waves reach the observation point, and a radio wave propagation characteristic estimation module estimates the propagation characteristics of radio waves at the observation point based on this calculated path.

Radio wave propagation characteristic estimation system, radio wave propagation characteristic estimation method, and radio wave propagation characteristic estimation program

Growing community of inventors

Tokyo, Japan

Yuma Matsuda