公开(公告)号：US20220398473A1

公开(公告)日：2022-12-15

申请号：US17696049

申请日：2022-03-16

Applicant: Hitachi, Ltd.

Inventor： Kenta KANAI ,  Masayuki MOROHASHI ,  Akira MATSUMOTO

IPC: G06N5/04 ,  G06F16/22

Abstract: A computer system manages a data set of learning data. The computer system is configured to: generate, in a case where a plurality of pieces of input data including the value of the explanatory variable and forming a time series are received, groups by arranging a plurality of pieces of the learning data in time-series order and grouping the plurality of pieces of the learning data in predetermined time widths; execute, for each of a plurality of the groups, index calculation processing of calculating a selection index of sampling of the learning data; select the plurality of pieces of the learning data from the data set based on the selection index; learn the model by using the selected plurality of pieces of the learning data; and output a predicted value of each of the plurality of pieces of input data by using the model.

公开(公告)号：US20200088759A1

公开(公告)日：2020-03-19

申请号：US16458903

申请日：2019-07-01

Applicant: HITACHI, LTD.

Inventor： Takashi OSHIMA ,  Yuki FURUBAYASHI ,  Keijiro MORI ,  Naoki MORI ,  Akira MATSUMOTO

IPC: G01P15/125

Abstract: Provided is a sensor that is highly accurate while ensuring reduced power consumption. A sensor is an electronic circuit that includes a sensor element, an analog filter, an A/D converter, and first and second electronic circuit. The analog filter filters a waveform that includes a sensor signal from the sensor element and noise based on a servo signal. The A/D converter converts the waveform filtered by the analog filter into a first digital signal. The first electronic circuit includes a digital filter and acquires a second digital signal by performing signal processing including at least a filtering process on the servo signal by using the digital filter. The second electronic circuit acquires a third digital signal by subtracting the second digital signal from the first digital signal. A setting for the signal processing for acquiring the second digital signal is changed on the basis of the third digital signal.