Patents by Inventor Kota Yamaguchi

Kota Yamaguchi 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: 11111871
    Abstract: Provided is an ignition control section and an injection control section. When partial compression ignition combustion is carried out, the ignition control section causes an ignition plug to carry out: main ignition in which a spark is generated in a late period of a compression stroke or an initial period of an expansion stroke to initiate SI combustion; and preceding ignition in which the spark is generated at earlier timing than the main ignition. Also, when the partial compression ignition combustion is carried out, the injection control section causes an injector to inject fuel at such timing that the fuel exists in a cylinder at an earlier time point than the preceding ignition. Ignition timing of the preceding ignition is set to be more advanced when an in-cylinder temperature specified by an in-cylinder temperature specification section is high than when the in-cylinder temperature is low.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: September 7, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Kota Matsumoto, Tomonori Urushihara, Keiji Maruyama, Masanari Sueoka, Ryohei Ono, Yuji Harada, Toru Miyamoto, Atsushi Inoue, Tatsuhiro Tokunaga, Takuya Ohura, Yusuke Kawai, Tomohiro Nishida, Keita Arai, Yodai Yamaguchi
  • Patent number: 11105255
    Abstract: The invention is provided with an ignition control section and an injection control section. When partial compression ignition combustion is carried out, the ignition control section causes an ignition plug to carry out: main ignition in which a spark is generated in a late period of a compression stroke or an initial period of an expansion stroke to initiate SI combustion; and preceding ignition in which the spark is generated at earlier timing than the main ignition. Also, when the partial compression ignition combustion is carried out, the injection control section causes an injector to inject fuel at such timing that the fuel exists in a cylinder at an earlier time point than the preceding ignition. Ignition timing of the preceding ignition is set to be more retarded when fuel concentration specified by a fuel concentration specification section is low than when the fuel concentration is high.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: August 31, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Kota Matsumoto, Tomonori Urushihara, Keiji Maruyama, Masanari Sueoka, Ryohei Ono, Yuji Harada, Toru Miyamoto, Atsushi Inoue, Tatsuhiro Tokunaga, Takuya Ohura, Yusuke Kawai, Tomohiro Nishida, Keita Arai, Yodai Yamaguchi
  • Publication number: 20210233228
    Abstract: A robot system includes a robot including a hand portion which grips and takes out a workpiece from an accommodation unit in which a plurality of workpieces are accommodated, and transports the workpiece to a predetermined position; a robot control unit which controls conveyance operation of the robot of taking out the workpiece from the accommodation unit and transporting the workpiece to the predetermined position; and a conveyance condition setting unit which sets a conveyance condition regarding the conveyance operation and including, in the workpiece, at least a grip prohibited region that is prohibited from being gripped by the hand portion. The robot control unit controls the robot based on the conveyance condition set by the conveyance condition setting unit.
    Type: Application
    Filed: June 14, 2018
    Publication date: July 29, 2021
    Applicant: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Kota YAMAGUCHI, Toshihiro MICHIZOE
  • Patent number: 10704226
    Abstract: A control method in a motor grader including a running wheel, an inclination mechanism which inclines the running wheel, an operation portion, and a sensor capable of detecting whether or not the running wheel is at an erect position includes outputting from a controller, a control signal for driving the inclination mechanism in response to an operation command in accordance with a state of operation onto the operation portion and stopping output of the control signal in response to the operation command when the sensor detects the erect position.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: July 7, 2020
    Assignee: KOMATSU LTD.
    Inventors: Kota Yamaguchi, Yasuko Yamamoto
  • Patent number: 10536067
    Abstract: A rotary machine cools a cooling target inside a rotor rotatable around a rotational axis, includes a condenser section disposed outside the rotor and condenses a gas phase cooling medium into a liquid phase cooling medium; an evaporator section disposed inside the rotor, and evaporates the liquid phase cooling medium generated by condensation in the condenser section into the gas phase cooling medium, by heat exchange between the cooling target and the liquid phase cooling medium; and a coupling pipe flows the liquid phase cooling medium and the gas phase cooling medium between the evaporator section and the condenser section, wherein the coupling pipe has a pipe structure in which a liquid phase cooling medium passage flows the liquid phase cooling medium generated by the condensation in the condenser section and a gas phase cooling medium passage flows the gas phase cooling medium generated by evaporation in the evaporator section.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: January 14, 2020
    Assignees: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY
    Inventors: Yohei Murase, Etsuya Yanase, Toshiyuki Yanamoto, Mitsuru Izumi, Motohiro Miki, Kota Yamaguchi
  • Patent number: 10476365
    Abstract: Provided is a rotary machine capable of increasing cooling efficiency while preventing an increase in the weight and cost of a rotor even in a case where the diameter of the rotor is increased.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: November 12, 2019
    Assignees: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY
    Inventors: Yohei Murase, Etsuya Yanase, Toshiyuki Yanamoto, Mitsuru Izumi, Motohiro Miki, Kota Yamaguchi
  • Publication number: 20190063035
    Abstract: A control method in a motor grader including a running wheel, an inclination mechanism which inclines the running wheel, an operation portion, and a sensor capable of detecting whether or not the running wheel is at an erect position includes outputting from a controller, a control signal for driving the inclination mechanism in response to an operation command in accordance with a state of operation onto the operation portion and stopping output of the control signal in response to the operation command when the sensor detects the erect position.
    Type: Application
    Filed: March 16, 2017
    Publication date: February 28, 2019
    Applicant: KOMATSU LTD.
    Inventors: Kota YAMAGUCHI, Yasuko YAMAMOTO
  • Publication number: 20190036438
    Abstract: Provided is a rotary machine capable of increasing cooling efficiency while preventing an increase in the weight and cost of a rotor even in a case where the diameter of the rotor is increased.
    Type: Application
    Filed: August 2, 2016
    Publication date: January 31, 2019
    Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY
    Inventors: Yohei MURASE, Etsuya YANASE, Toshiyuki YANAMOTO, Mitsuru IZUMI, Motohiro MIKI, Kota YAMAGUCHI
  • Publication number: 20180248464
    Abstract: A rotary machine cools a cooling target inside a rotor rotatable around a rotational axis, includes a condenser section disposed outside the rotor and condenses a gas phase cooling medium into a liquid phase cooling medium; an evaporator section disposed inside the rotor, and evaporates the liquid phase cooling medium generated by condensation in the condenser section into the gas phase cooling medium, by heat exchange between the cooling target and the liquid phase cooling medium; and a coupling pipe flows the liquid phase cooling medium and the gas phase cooling medium between the evaporator section and the condenser section, wherein the coupling pipe has a pipe structure in which a liquid phase cooling medium passage flows the liquid phase cooling medium generated by the condensation in the condenser section and a gas phase cooling medium passage flows the gas phase cooling medium generated by evaporation in the evaporator section.
    Type: Application
    Filed: August 2, 2016
    Publication date: August 30, 2018
    Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY
    Inventors: Yohei MURASE, Etsuya YANASE, Toshiyuki YANAMOTO, Mitsuru IZUMI, Motohiro MIKI, Kota YAMAGUCHI
  • Patent number: 8554733
    Abstract: A disaster recovery technology capable of achieving the high-speed FO and correctly reading the logs even if the unit of logs written in the main site is large is provided. In the disaster recovery system comprising a main site and a sub-site, when the writing in units of a log block consisting of a plurality of log records is performed in the main site and the logs are applied in the sub-site, the log blocks are read from the sub-storage to verify the consistency, and it is determined whether the reading process conflicts with the writing process through the remote copy operation when reading the logs. Then, only the log blocks in which the reading process does not conflict with the writing process as a result of the determination are applied to the database. Thereby, the logs are applied in the sub-site independently to recover the database.
    Type: Grant
    Filed: June 15, 2005
    Date of Patent: October 8, 2013
    Assignee: Hitachi Ltd.
    Inventors: Yoshio Suzuki, Nobuo Kawamura, Kota Yamaguchi, Shinji Fujiwara, Satoru Watanabe
  • Publication number: 20120102080
    Abstract: Provided is a computer system configured so that security compliance problems can be avoided and an access control model which can be uniquely customized can be implemented by extending the storage capacity to an external storage service by means of integrated management of an existing NAS(s) and the external storage service, and controlling the optimum data placement according to the confidentiality and importance level of data. In a computer system according to this invention, a local storage system includes an extended server for integrating a NAS(s) existing in the local storage system with an external storage service and thereby providing a client with a storage area as a single virtual NAS.
    Type: Application
    Filed: May 20, 2010
    Publication date: April 26, 2012
    Applicants: HITACHI SOFTWARE ENGINEERING CO., LTD., HITACHI, LTD.
    Inventors: Yasuhiro Kirihata, Michael Hay, Kota Yamaguchi
  • Patent number: 8117167
    Abstract: There is provided a technique capable of executing a predetermined processing while continuing a database processing. Firstly, the database to be operated is switched from the main database to a duplicate database. The predetermined processing is executed to the main database which becomes the non-operation mode by the switching. Next, a database access request is distributed to the duplicate database which becomes the operation mode by the switching, thereby performing the database processing. Update information indicating the content of the update processing performed to the duplicate database is output. The output update information is reflected on the main data base for which the predetermined processing has been executed. After this, the database to be operated is switched from the duplicate database to the main database.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: February 14, 2012
    Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.
    Inventors: Kenichi Kitamura, Mitsuo Miyazaki, Kota Yamaguchi, Hiroshi Yamakawa
  • Patent number: 7925633
    Abstract: To reduce operational and management costs during normal operations while recovering a database without loss and maintaining on-line performance on a site. A first system includes a primary storage system (103) that stores a DB (107) and a main computer (100) that executes a primary DBMS (101), which provides a DB. A second system includes a secondary (113) that receives from the primary storage system (103) a copy of a log, which shows update differences of the DB (107), and stores a secondary DBMS (117), and a subset (500) that recovers the secondary DB (117) according to the log that is copied from the primary storage system (103). When a failure occurs in the first system, the first system is switched to the second system. A second computer (110) that executes a second DBMS (111) is added to the second system, and the secondary DB (117) that is recovered or is being recovered in the subset (500) is taken over to the second computer (110).
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: April 12, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Suzuki, Nobuo Kawamura, Kota Yamaguchi, Shinji Fujiwara, Satoru Watanabe, Masaru Kitsuregawa
  • Patent number: 7890461
    Abstract: A disaster recovery system and a method therefor, having: a function for receiving write requests from a host computer to write log information indicating the contents of a database process executed for a database buffer on a main site, database data updated on the database buffer and status information indicating the position of log information used for disaster recovery; a function for transferring the received write request for log information to a recovery site by a synchronous remote copy process; and a function for transferring the received write request for database data to the recovery site by an asynchronous remote copy process. While remote copy can be executed at a long distance without data loss, the deterioration of the performance of a database process on a main site can be suppressed.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: February 15, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Oeda, Nobuo Kawamura, Kota Yamaguchi
  • Publication number: 20100121824
    Abstract: A technique capable of constructing a disaster recovery system reduced in performance degradation of a primary system is provided. The technique includes a step of conducting synchronous writing of log information into a secondary storage subsystem in a secondary system when a write request received from a host computer is a write request of log information, a step of temporarily storing a write request and conducting asynchronous writing into the secondary storage subsystem when the received write request is a write request of database data or status information, a step of modifying log information, data in a database area, and status information in the secondary storage subsystem according to contents of a write request received from a primary storage subsystem, and a step of recovering the database area according to contents of log information in a location indicated by the status information.
    Type: Application
    Filed: January 4, 2010
    Publication date: May 13, 2010
    Applicants: HITACHI, LTD., HITACHI SOFTWARE ENGINEERING CO., LTD.
    Inventors: Nobuo Kawamura, Kota Yamaguchi, Takashi Oeda
  • Patent number: 7698087
    Abstract: A program circuit activates a pass signal when a first program unit is programmed. The first program unit is programmed when a test of an internal circuit is passed. A mode setting circuit switches an operation mode to a normal operation mode or a test mode by external control. A state machine allows a partial circuit of the internal circuit to perform an unusual operation different from a normal operation when the pass signal is inactivated during the normal operation mode. By recognizing the unusual operation during the normal operation mode, it can be easily recognized that a semiconductor integrated circuit is bad. Since a failure can be recognized without shifting to the test mode, for example, a user who purchases the semiconductor integrated circuit can also easily recognize the failure.
    Type: Grant
    Filed: August 22, 2007
    Date of Patent: April 13, 2010
    Assignee: Fujitsu Microelectronics Limited
    Inventor: Kota Yamaguchi
  • Patent number: 7668874
    Abstract: A technique capable of constructing a disaster recovery system reduced in performance degradation of a primary system is provided. The technique includes a step of conducting synchronous writing of log information into a secondary storage subsystem in a secondary system when a write request received from a host computer is a write request of log information, a step of temporarily storing a write request and conducting asynchronous writing into the secondary storage subsystem when the received write request is a write request of database data or status information, a step of modifying log information, data in a database area, and status information in the secondary storage subsystem according to contents of a write request received from a primary storage subsystem, and a step of recovering the database area according to contents of log information in a location indicated by the status information.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: February 23, 2010
    Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.
    Inventors: Nobuo Kawamura, Kota Yamaguchi, Takashi Oeda
  • Patent number: 7562103
    Abstract: A technique capable of constructing a disaster recovery system reduced in performance degradation of a primary system is provided. The technique includes a step of conducting synchronous writing of log information into a secondary storage subsystem in a secondary system when a write request received from a host computer is a write request of log information, a step of temporarily storing a write request and conducting asynchronous writing into the secondary storage subsystem when the received write request is a write request of database data or status information, a step of modifying log information, data in a database area, and status information in the secondary storage subsystem according to contents of a write request received from a primary storage subsystem, and a step of recovering the database area according to contents of log information in a location indicated by the status information.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: July 14, 2009
    Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.
    Inventors: Nobuo Kawamura, Kota Yamaguchi, Takashi Oeda
  • Publication number: 20090144291
    Abstract: There is provided a technique capable of executing a predetermined processing while continuing a database processing. Firstly, the database to be operated is switched from the main database to a duplicate database. The predetermined processing is executed to the main database which becomes the non-operation mode by the switching. Next, a database access request is distributed to the duplicate database which becomes the operation mode by the switching, thereby performing the database processing. Update information indicating the content of the update processing performed to the duplicate database is output. The output update information is reflected on the main data base for which the predetermined processing has been executed. After this, the database to be operated is switched from the duplicate database to the main database.
    Type: Application
    Filed: January 30, 2009
    Publication date: June 4, 2009
    Inventors: Kenichi Kitamura, Mitsuo Miyazaki, Kota Yamaguchi, Hiroshi Yamakawa
  • Patent number: 7529964
    Abstract: A recovery of a secondary DB is executed by a log including a update difference of a primary DB, and a command is executed by adding the command to the log and analyzing the log by a secondary site. An operation command execution in the secondary site is applied to the DB having the consistency in the transaction at the same timing as a primary site or an intended timing, by transferring and executing the operation command via the log. In the case that the command is constituted by a snap shot generating instruction, a plurality of volumes of a mirror set forming a secondary storage apparatus are set to a pair state and the secondary DB is written in each of the volumes and synchronized, and the mirror set is set to a split state after the synchronization is finished, whereby a secondary DB is stored.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: May 5, 2009
    Assignee: Hitachi Communication Technologies, Ltd.
    Inventors: Yoshio Suzuki, Nobuo Kawamura, Kota Yamaguchi, Satoru Watanabe, Shinji Fujiwara