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公开(公告)号：US12044714B2
公开(公告)日：2024-07-23
申请号：US17270899
申请日：2018-08-30
Applicant: NEC Corporation
Inventor： Murtuza Petladwala , Mitsuru Sendoda , Yuko Ohta , Ryota Suzuki
CPC classification number: G01R23/10 , G01R23/145 , G01R23/18
Abstract: Provided a method comprising: obtaining waveform data sets of a periodic electric waveform signal, with a length set to one cycle time; calculating a frequency spectrum for each waveform data set; extracting and separating odd and even frequency harmonics to create odd and even frequency harmonic matrices on which a canonical correlation analysis (CCA) being applied to obtain CCA features; performing linear transformation on the CCA features to obtain linear transformed features; generating a model based on the linear transformed features; performing magnitude quantization of frequency spectrums of waveform data sets to identify normal and anomalous waveform signals.
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公开(公告)号：US10712374B2
公开(公告)日：2020-07-14
申请号：US15562540
申请日：2016-01-08
Applicant: NEC CORPORATION
Inventor： Takahiro Toizumi , Eisuke Saneyoshi , Ryota Suzuki , Shigeru Koumoto
Abstract: As means for solving the above-described problem, there is provided a data processing device (1) including a measurement data acquisition unit (10) that acquires measurement data indicating a temporal change in at least one of current consumption and power consumption of an electrical apparatus, a reference component extraction unit (20) that extracts a reference component of the current consumption and a reference component of the power consumption from the measurement data, and a feature value acquisition unit (30) that acquires a feature value of each reference component.
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公开(公告)号：US11360129B2
公开(公告)日：2022-06-14
申请号：US17262518
申请日：2018-07-23
Applicant: NEC Corporation
Inventor： Shingo Takahashi , Shigeru Koumoto , Ryota Suzuki , Murtuza Petladwala
Abstract: Provided a method including applying a Fourier Transform to an AC current waveform measured to perform conversion thereof to a frequency domain; adjusting entire phase components of frequency spectra obtained as a result of the Fourier Transform, such that a phase component of an AC power supply frequency becomes zero; and applying an inverse Fourier Transform to the frequency spectra with the entire phase components thereof adjusted to obtain a current waveform in a time domain.
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公开(公告)号：US11200134B2
公开(公告)日：2021-12-14
申请号：US16981101
申请日：2018-03-26
Applicant: NEC CORPORATION
Inventor： Murtuza Petladwala , Ryota Suzuki , Shigeru Koumoto
Abstract: An anomaly detection apparatus estimates time series data of a first signal of each appliance by disaggregating an aggregate signal that is a sum of first signals of a plurality of appliances into each first signal of an individual appliance, calculates a residual by subtracting sum of the estimated first signals of the plurality of appliances from the aggregate signal, and obtains value of the second signal at a time point at which the residual indicates presence of anomaly, and checks if there is match of pair of value of the estimated first signal and estimated state of the appliance, with any one of the one or more pairs of value of the first signal and state of the appliance, stored in a table, in association with the value of the second signal at the time point at which the residual indicates presence of anomaly to identify appliance with anomaly.
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公开(公告)号：US12044667B2
公开(公告)日：2024-07-23
申请号：US17262955
申请日：2018-07-31
Applicant: NEC Corporation
Inventor： Ryota Suzuki , Riki Eto
CPC classification number: G01N33/0067 , G01N1/24 , G01N33/0009 , G01N33/0011 , G01N33/0016 , G01N33/0027 , G01N33/0031
Abstract: An information processing apparatus (2000) acquires time-series data (14) output by a sensor (10) and computes a plurality of feature constants θi and a contribution value ξi representing contribution with respect to the time-series data (14) for each feature constant θi. Thereafter, the information processing apparatus (2000) outputs information in which a set Θ of the feature constants θi and a set Ξ of the contribution values ξi are associated with each other as a feature value of a target gas. As the feature constant θ, a velocity constant β or a time constant τ that is a reciprocal of the velocity constant can be adopted.
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Patent Agency Ranking
公开(公告)号：US11635454B2
公开(公告)日：2023-04-25
申请号：US16635282
申请日：2017-08-03
Applicant: NEC Corporation
Inventor： Murtuza Petladwala , Ryota Suzuki , Shigeru Koumoto
Abstract: Provided an apparatus that receives time series data from a data storage unit storing time series of sample data or feature values calculated from the sample data, computes a measure indicating change and repetition characteristics of the time series data, based on sample value distribution thereof, selects a state model structure to be used for model learning and estimation, from state models including a fully connected state model and a one way direction state model, based on the measure and stores the selected state model in a model storage unit.
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公开(公告)号：US11501388B2
公开(公告)日：2022-11-15
申请号：US16344881
申请日：2017-10-30
Applicant: NEC Corporation
Inventor： Eisuke Saneyoshi , Shigeru Koumoto , Akira Shoujiguchi , Rie Iwasaki , Takahiro Toizumi , Ryota Suzuki
IPC: G06Q50/04 , G05B19/406 , G06Q10/06 , G06Q10/00
Abstract: There are provided a repair determination section that determines, based on failure information on the facility for manufacturing a product, a repair time required to repair the facility, and a recovery plan creation section that creates a recovery plan in accordance with a predetermined production evaluation indicator, based on the repair time and production information on a line with the failed facility, one or more other facilities, and on one or more other lines.
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公开(公告)号：US11237584B2
公开(公告)日：2022-02-01
申请号：US16326963
申请日：2017-08-17
Applicant: NEC Corporation
Inventor： Takahiro Toizumi , Ryota Suzuki , Shigeru Koumoto
Abstract: A state change feature value relating to power supply current waveform data is extracted, and a transition state is detected, for a section of the waveform data, based on a magnitude of a state change feature value extracted.
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公开(公告)号：US11586703B2
公开(公告)日：2023-02-21
申请号：US16965742
申请日：2018-02-08
Applicant: NEC Corporation
Inventor： Ryota Suzuki , Shingo Takahashi , Murtuza Petladwala , Shigeru Koumoto
Abstract: A feature transformation apparatus includes at least a combination storage part that stores a combination with respect to a set of features, wherein data is approximately represented as a sum of the combination of the features; and a transformation part that transforms at least the combination so as not to change the sum of the combination of the set of features.
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公开(公告)号：US11409591B2
公开(公告)日：2022-08-09
申请号：US16769752
申请日：2018-06-28
Applicant: NEC Corporation
Inventor： Ryota Suzuki , Shigeru Koumoto
IPC: G06F11/07
Abstract: An anomaly determination apparatus, an anomaly determination method, and a program, capable of easily determining whether or not an anomaly has occurred are provided. An anomaly determination apparatus (1) includes a transformation unit (2) and an anomaly determination unit (3). The transformation unit (2) performs a transformation process using a transform function for transforming an anomaly level of a signal into a probability variable value, the probability variable value being a variable value in accordance with a predetermined probability distribution. Note that the transform function is a monotone function. The anomaly determination unit (3) determines presence/absence of an anomaly of a sample of the anomaly level by using a result of the transformation by the transformation unit (2).
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