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1.发明公开公开(公告)号：US20230308198A1
公开(公告)日：2023-09-28
申请号：US18181182
申请日：2023-03-09
Applicant: NEC Corporation
Inventor： Jun SAKAI
IPC: H04B17/391 , H04B17/309
CPC classification number: H04B17/391 , H04B17/309
Abstract: A radio wave abnormality detection system, a radio wave abnormality detection method, and a radio wave abnormality detection program that are capable of accurately detecting a radio wave abnormality are provided.
The radio wave abnormality detection system includes: a determination unit that determines an extraction period, based on a transmission duration estimated from first received data of a radio wave received at a first timing; a learning unit that generates a learned model in which a feature value extracted in the extraction period from second received data of a radio wave received at a second timing is machine-learned; and a detection unit that detects a radio wave abnormality by using a feature value extracted in the extraction period from third received data of a radio wave received at a third timing, and the learned model.-
公开(公告)号：US20200379080A1
公开(公告)日：2020-12-03
申请号：US16766487
申请日：2018-11-28
Applicant: NEC Corporation
Inventor： Jun SAKAI
Abstract: A location estimation system includes a location estimation part that estimates a location of a radio wave transmission source by using radio wave strengths received by a plurality of radio wave sensors dispersedly placed in a predetermined area, propagation models, each of which represents a relationship between radio wave strengths and distance, and probability distribution models of the radio wave strengths. The location estimation part in the location estimation system estimates the location of the radio wave transmission source by using a propagation model set for an individual sub-area obtained by dividing the predetermined area based on locations of the radio wave sensors in the predetermined area and placement of an obstacle(s) in the predetermined area.
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公开(公告)号：US20230092448A1
公开(公告)日：2023-03-23
申请号：US17801313
申请日：2020-12-21
Applicant: NEC Corporation
Inventor： Umihiko ITO , Kenji KOUNO , Toshiki TAKEUCHI , Jun SAKAI , Taichi OHTSUJI
IPC: H04W24/08 , H04B17/309
Abstract: An abnormality detection apparatus according to an example embodiment includes a reception unit for receiving radio waves, a feature amount extraction unit for extracting a plurality of feature amounts in a predetermined frequency band from the received radio waves, a recording unit for recording the plurality of extracted feature amounts and the frequency band in association with each other, and a processing unit for acquiring a plurality of feature amounts in a predetermined range from the plurality of accumulated feature amounts, determining whether or not the acquired feature amounts fall within a preset normal range, and generating, based on a result of the determination, an abnormality determination mask, threshold values for the plurality of feature amounts, in order to detect an abnormality of the radio waves being set in the abnormality determination mask.
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公开(公告)号：US20220276333A1
公开(公告)日：2022-09-01
申请号：US17632558
申请日：2019-09-09
Applicant: NEC Corporation
Inventor： Jun SAKAI
IPC: G01S5/02
Abstract: The present invention includes: a learning data generation unit (53) that acquires an expected value of a measured value of received power; a spatial distribution synthesis unit (54) that calculates an expected value of a measured value of received power when a radio wave is transmitted from any position in a target area; a likelihood calculation unit (55) that calculates a likelihood distribution that a radio wave source exists at each point of the target area; a position estimation unit (56) that estimates transmission power of a transmission source to be estimated, estimates a likelihood distribution at the transmission power, and estimates a position of the transmission source; and a display unit (57) that displays a spatial distribution of a conformity degree in the target area and a position of a maximum likelihood value and a position of a local maximum value of the likelihood calculated (55).
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公开(公告)号：US20220270460A1
公开(公告)日：2022-08-25
申请号：US17625412
申请日：2020-07-10
Applicant: NEC Corporation
Inventor： Jun SAKAI , Masaki KITSUNEZUKA , Toshiki TAKEUCHI , Taichi OHTSUJI , Shoji NISHIMURA , Yasufumi HIRAKAWA
Abstract: A wireless terminal detection system provided with user position information acquisition means for measuring a position of a reception-side wireless terminal; pattern classification means for classifying movement patterns extracted from position history information of the reception-side wireless terminal into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determination means for determining whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns.
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Patent Agency Ranking
公开(公告)号：US20220264308A1
公开(公告)日：2022-08-18
申请号：US17625420
申请日：2020-07-10
Applicant: NEC Corporation
Inventor： Jun SAKAI , Masaki KITSUNEZUKA , Taichi OHTSUJI , Toshiki TAKEUCHI , Shoji NISHIMURA , Yasufumi HIRAKAWA
IPC: H04W12/122 , H04W12/63 , H04W24/10 , H04W12/69
Abstract: A wireless terminal detection system provided with a radio wave identification unit that extracts identification information in accordance with the wireless terminals that are transmission sources; a radio wave intensity measurement unit that measures radio wave intensities of the radio waves; a distance estimation unit that estimates an attenuation rate of the radio wave intensities with respect to distance based on a number of the wireless terminals, and that estimates distances to the individual wireless terminals based on the estimated attenuation rate; and a notification unit that notifies a user that a suspicious wireless terminal has been detected if, based on the identification information, a wireless terminal among the radio wave transmission sources is determined to be registered as a suspicious wireless terminal, and the estimated distance to the wireless terminal among the radio wave transmission sources is not more than a prescribed distance.
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公开(公告)号：US20210258742A1
公开(公告)日：2021-08-19
申请号：US17173619
申请日：2021-02-11
Applicant: NEC Corporation
Inventor： Jun SAKAI , Toshiki TAKEUCHI , Masao TANIGUCHI
Abstract: An apparatus for estimating the number of people according to the present disclosure includes at least one memory configured to store an instruction and at least one processor configured to execute the instruction, the memory and the processor being configured to group signals of terminals acquired within a predetermined time, extract first identifiers of the terminals from the signals included in the group, classify the first identifiers into first identifiers assigned to a global network and those assigned to a local network, count the first identifiers assigned to the global network, and estimate the number of people by using the number of the first identifiers assigned to the global network.
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8.发明申请公开(公告)号：US20200049595A1
公开(公告)日：2020-02-13
申请号：US16497011
申请日：2018-01-23
Applicant: NEC Corporation
Inventor： Jun SAKAI , Takahiro KUMURA , Manabu KUSUMOTO , Soichiro TAKATA
Abstract: A pipe diagnosis apparatus 10 includes a time-series data acquisition unit 11 that acquires time-series data on pressure of a fluid in piping equipment to be diagnosed, a pressure change measurement unit 12 that measures the number of pressure changes in the fluid from the time-series data on the pressure of the fluid, and a failure risk estimation unit 13 that estimates a failure risk of the piping equipment based on the measured number of pressure changes and a strength of a pipe included in the piping equipment.
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9.发明申请公开(公告)号：US20190024849A1
公开(公告)日：2019-01-24
申请号：US16072251
申请日：2017-02-14
Applicant: NEC Corporation
Inventor： Jun SAKAI
Abstract: Provided is a control device, etc., with which it is possible to increase the accuracy of control of a pump, valve, etc., provided to a pipeline network. This control device is provided with: a friction loss calculation unit for determining pressure friction loss on the basis of the pressure of a fluid in piping; a control amount calculation unit for determining, on the basis of the friction loss, a control amount of the pump or valve that controls the distribution of water in the piping; and a control unit for controlling the pump or valve on the basis of the control amount.
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公开(公告)号：US20240386324A1
公开(公告)日：2024-11-21
申请号：US18659108
申请日：2024-05-09
Applicant: NEC Corporation , NEC Platforms, Ltd.
Inventor： Shoya TOKITA , Jun SAKAI , Toshiki TAKEUCHI , Ayaka HARAYAMA , Tsuyoshi HAMADA , Tomohiro SHIMODA
IPC: G06N20/00
Abstract: The learning model generator includes a data division unit which groups multiple feature data, each of which indicates a feature, and a learning model generation unit which generates a learning model using feature data belonging to a first group among multiple groups formed by the data division unit, or the feature data belonging to the first group and a part of feature data belonging to other groups, as training data.
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