Patents by Inventor Nao Saito

Nao Saito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11048246
    Abstract: A manipulation candidate classification unit provided in this operation assistance device classifies manipulation logs associated with a plurality of events stored in a past case database, as manipulation candidates, on the basis of measured value feature quantity tolerance ranges, and groups the classified manipulation candidates and the measured value feature quantity tolerance ranges together to create manipulation candidate groups. A manipulation candidate search unit searches a manipulation candidate database for a manipulation candidate group associated with a feature quantity that is associated with a past event and that is close to a feature quantity associated with a new event, and outputs the found manipulation candidate group to an output unit.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 29, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Nao Saito, Kenta Kirihara, Masahiro Yatsu
  • Patent number: 11016515
    Abstract: A system operation decision-making assistance device includes: a state mode clustering unit that calculates, on the basis of measurement data DB1 of a power system and a clustering parameter DB3, which state mode, from among prescribed state modes, applies to a power system; a state mode collation unit that collates state transition data DB4 indicating transitions between state modes and the calculated state mode to calculate state transition probability data, which is the probability of transitioning from the calculated state mode to each state mode defined in the state transition data; and an accident shift pattern calculation unit that calculates important accident cases on the basis of a system model DB2, an importance parameter DB5 including the importance of a power system accident, the measurement data, and the calculated state transition probability data.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: May 25, 2021
    Assignee: HITACHI, LTD.
    Inventors: Kenta Kirihara, Nao Saito, Taichiro Kawahara, Masahiro Yatsu
  • Publication number: 20210103365
    Abstract: An operation support device is provided with: a similarity determination unit for determining the similarity between actual measured data and simulated data, said actual measured data being measured in an operation target after performing control on the operation target on the basis of, among a plurality of control candidates managed using a control candidate table, a control candidate corresponding to an event having occurred in the operation target, said simulated data being obtained by a simulation assuming the system state of the operation target after performing control on the operation target on the basis of system data indicating the state of the operation target before performing the control on the operation target; and a control candidate table update unit for updating the control candidate table in accordance with the determination result of the similarity determination unit.
    Type: Application
    Filed: April 18, 2018
    Publication date: April 8, 2021
    Inventors: Nao SAITO, Kenta KIRIHARA, Masahiro YATSU
  • Patent number: 10892640
    Abstract: The voltage and reactive power monitoring/control method includes: measurement data for the power system and data for the system equipment of the power system are used to calculate the system status for the power system at the time of measurement; data for a status estimation calculation result and predicted data for the power generation and load of the power system are used to predictively calculate a system status at a future time from the time of the power system measurement; a fluctuation component is obtained for the predicted value of the data obtained from the power system; the reactive power required to suppress the fluctuation component is obtained, as a required reactive power amount; a reactive power distribution subject is selected from a plurality of pieces of control subject equipment; an output distribution calculation is performed for the required reactive power amount for the selected control subject equipment.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: January 12, 2021
    Assignee: HITACHI, LTD.
    Inventors: Eisuke Kuroda, Toshiyuki Miyake, Nao Saito, Masahiro Yatsu, Taichirou Kawahara
  • Patent number: 10804701
    Abstract: With conventional technology, since calculation of system stability is performed regarding all imaginable failure cases for the combinations of all objects to be controlled to determine an object to be controlled, there has been a problem of not being able to determine an object to be controlled in all the imaginable failure cases within a calculation period due to longer calculation time.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: October 13, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Daichi Kato, Nao Saito, Masahiro Yatsu
  • Publication number: 20200273120
    Abstract: In order to provide a power grid decision-making support device and method which are capable of providing operator decision-making support, and quickly presenting control candidates, and a system which applies the same, one representative embodiment of the present invention provides a power grid decision-making support device characterized by comprising: a control candidate learning unit for deriving, by learning, a plurality of control candidate models for stabilizing a power grid; a control candidate extraction unit for extracting, from the plurality of control candidate models derived by the control candidate learning unit, control candidates using power grid measurement data and extraction parameters; a control candidate evaluation unit for evaluating the control candidates using a power grid model and the control candidates; and an information presentation unit for presenting information about the evaluation results and the control candidates.
    Type: Application
    Filed: February 24, 2017
    Publication date: August 27, 2020
    Inventors: Kenta KIRIHARA, Eisuke KURODA, Nao SAITO, Hiroo HORII, Masahiro YATSU
  • Publication number: 20200266628
    Abstract: To calculate the prediction of the power generation amount with high accuracy even when the amount of the track record data of the Generator power generation amount is insufficient or the amount of the weather track record data similar to the weather prediction result is small.
    Type: Application
    Filed: October 26, 2016
    Publication date: August 20, 2020
    Inventors: Daichi KATO, Nao SAITO, Masahiro YATSU
  • Patent number: 10581245
    Abstract: The setting range of the voltage and the reactive power of a power system is maintained during variations of voltage and power flow due to the output variation of renewable energy of a large number of power supplies which fluctuate due to weather. A voltage/reactive power operation assisting device is provided with a first database for storing the data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting the voltage/reactive power of a power system. A second database stores the device operation data of the individual control device; and the operation of the individual control device is predicted from the data stored in the first database to obtain individual control device operation prediction data. A display unit displays the individual control device operation prediction data and the device operation data in a contrastive manner.
    Type: Grant
    Filed: September 4, 2017
    Date of Patent: March 3, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Eisuke Kuroda, Nao Saito, Kouichi Hara, Masahiro Yatsu, Taichiro Kawahara, Shota Omi
  • Publication number: 20200047502
    Abstract: According to the present invention, a printing apparatus is provided, the printing apparatus comprises a printhead including an ink discharge surface on which plurality of orifices for discharging ink are arranged and configured to print an image, a cap configured to cap the ink discharge surface, and a supply unit configured to selectively supply one of a plurality of types of liquids into the cap.
    Type: Application
    Filed: July 31, 2019
    Publication date: February 13, 2020
    Inventor: Nao Saito
  • Publication number: 20190280481
    Abstract: The setting range of the voltage and the reactive power of a power system is maintained during variations of voltage and power flow due to the output variation of renewable energy of a large number of power supplies which fluctuate due to weather. A voltage/reactive power operation assisting device is provided with a first database for storing the data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting the voltage/reactive power of a power system. A second database stores the device operation data of the individual control device; and the operation of the individual control device is predicted from the data stored in the first database to obtain individual control device operation prediction data. A display unit displays the individual control device operation prediction data and the device operation data in a contrastive manner.
    Type: Application
    Filed: September 4, 2017
    Publication date: September 12, 2019
    Inventors: Eisuke KURODA, Nao SAITO, Kouichi HARA, Masahiro YATSU, Taichiro KAWAHARA, Shota OMI
  • Publication number: 20190260205
    Abstract: With conventional technology, since calculation of system stability is performed regarding all imaginable failure cases for the combinations of all objects to be controlled to determine an object to be controlled, there has been a problem of not being able to determine an object to be controlled in all the imaginable failure cases within a calculation period due to longer calculation time.
    Type: Application
    Filed: July 28, 2017
    Publication date: August 22, 2019
    Inventors: Daichi KATO, Nao SAITO, Masahiro YATSU
  • Publication number: 20190220051
    Abstract: A system operation decision-making assistance device includes: a state mode clustering unit that calculates, on the basis of measurement data DB1 of a power system and a clustering parameter DB3, which state mode, from among prescribed state modes, applies to a power system; a state mode collation unit that collates state transition data DB4 indicating transitions between state modes and the calculated state mode to calculate state transition probability data, which is the probability of transitioning from the calculated state mode to each state mode defined in the state transition data; and an accident shift pattern calculation unit that calculates important accident cases on the basis of a system model DB2, an importance parameter DB5 including the importance of a power system accident, the measurement data, and the calculated state transition probability data.
    Type: Application
    Filed: October 6, 2017
    Publication date: July 18, 2019
    Inventors: Kenta KIRIHARA, Nao SAITO, Taichiro KAWAHARA, Masahiro YATSU
  • Publication number: 20190148977
    Abstract: The voltage and reactive power monitoring/control method includes: measurement data for the power system and data for the system equipment of the power system are used to calculate the system status for the power system at the time of measurement; data for a status estimation calculation result and predicted data for the power generation and load of the power system are used to predictively calculate a system status at a future time from the time of the power system measurement; a fluctuation component is obtained for the predicted value of the data obtained from the power system; the reactive power required to suppress the fluctuation component is obtained, as a required reactive power amount; a reactive power distribution subject is selected from a plurality of pieces of control subject equipment; an output distribution calculation is performed for the required reactive power amount for the selected control subject equipment.
    Type: Application
    Filed: March 21, 2017
    Publication date: May 16, 2019
    Inventors: Eisuke KURODA, Toshiyuki MIYAKE, Nao SAITO, Masahiro YATSU, Taichirou KAWAHARA
  • Publication number: 20190146468
    Abstract: A manipulation candidate classification unit provided in this operation assistance device classifies manipulation logs associated with a plurality of events stored in a past case database, as manipulation candidates, on the basis of measured value feature quantity tolerance ranges, and groups the classified manipulation candidates and the measured value feature quantity tolerance ranges together to create manipulation candidate groups. A manipulation candidate search unit searches a manipulation candidate database for a manipulation candidate group associated with a feature quantity that is associated with a past event and that is close to a feature quantity associated with a new event, and outputs the found manipulation candidate group to an output unit.
    Type: Application
    Filed: June 30, 2017
    Publication date: May 16, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Nao SAITO, Kenta KIRIHARA, Masahiro YATSU
  • Patent number: 8766877
    Abstract: A communication system in trains comprises a control data communication device 400 and an image data communication device 300 installed in each of the cars. The control data communication device 400 transmits train operation information, train location information, control instructions of train-mounted apparatuses, and the like. The image data communication device 300 transmits image information such as moving images and still images, audio information such as in-train announcement, textual information for caption display, and operation log information of apparatuses, which form the contents, to a display unit 200 installed in each of the cars and to apparatuses 500 such as a telephone. The display unit 200 switches the display on the screen in accordance with train control information transmitted from the control data communication device 400 through the image data communication device 300.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: July 1, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Nao Saito, Setsuo Arita, Satoru Ito, Kazunori Ayabe, Yukio Sagawa
  • Publication number: 20090306844
    Abstract: It is possible to provide a vehicle and an in-vehicle communication control device capable of performing control with preferable response even under an environment where notch attenuation exists and various noises are superimposed in a cable communication using a battery line.
    Type: Application
    Filed: May 11, 2005
    Publication date: December 10, 2009
    Inventors: Setsuo Arita, Yuji Ichinose, Yoshikazu Ishii, Nao Saito, Daisuke Shinma, Tatsuya Yoshida
  • Patent number: 7570748
    Abstract: Using a network in which one master station modem 105 and multiple slave station modem 106, 107, 108 are physically connected by rudder connection or bus connection with a telecommunication line 121, the measurement result of the S/N ratio between the master station and slave stations is once collected in the master station at the initialization stage, pairs of the modulation method, by which all modems can demodulate at high probability, and transmission voltage are calculated based on this data, and the calculation is transmitted to all slave stations; and at a normal transmission stage, information regarding the coordination and control of the network is transmitted in accordance with this setting. Thus, one-to-multi communication is realized, guaranteeing an access right.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: August 4, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yoshikazu Ishii, Setsuo Arita, Yuji Ichinose, Nao Saito, Daisuke Sinma, Yasuhiro Nakatsuka
  • Publication number: 20080237406
    Abstract: A communication system in trains comprises a control data communication device 400 and an image data communication device 300 installed in each of the cars. The control data communication device 400 transmits train operation information, train location information, control instructions of train-mounted apparatuses, and the like. The image data communication device 300 transmits image information such as moving images and still images, audio information such as in-train announcement, textual information for caption display, and operation log information of apparatuses, which form the contents, to a display unit 200 installed in each of the cars and to apparatuses 500 such as a telephone. The display unit 200 switches the display on the screen in accordance with train control information transmitted from the control data communication device 400 through the image data communication device 300.
    Type: Application
    Filed: January 24, 2008
    Publication date: October 2, 2008
    Inventors: Nao Saito, Setsuo Arita, Satoru Ito, Kazunori Ayabe, Yukio Sagawa
  • Publication number: 20050141683
    Abstract: Using a network in which one master station modem 105 and multiple slave station modem 106, 107, 108 are physically connected by rudder connection or bus connection with a telecommunication line 121, the measurement result of the S/N ratio between the master station and slave stations is once collected in the master station at the initialization stage, pairs of the modulation method, by which all modems can demodulate at high probability, and transmission voltage are calculated based on this data, and the calculation is transmitted to all slave stations; and at a normal transmission stage, information regarding the coordination and control of the network is transmitted in accordance with this setting. Thus, one-to-multi communication is realized, guaranteeing an access right.
    Type: Application
    Filed: December 22, 2004
    Publication date: June 30, 2005
    Inventors: Yoshikazu Ishii, Setsuo Arita, Yuji Ichinose, Nao Saito, Daisuke Sinma, Yasuhiro Nakatsuka