Patents by Inventor Yohei Katayama

Yohei Katayama 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).

  • Publication number: 20210295214
    Abstract: A learning apparatus including a biological information acquisition unit that acquires biological information, the biological information being information indicating a vital reaction of a test subject to a predetermined environment, an emotional information acquisition unit that acquires emotional information, the emotional information being information indicating an emotion of the test subject toward the environment, a first environmental information acquisition unit that acquires environmental information, the environmental information being information indicating an attribute of the environment acting on the test subject, and a relationship information learning unit that learns, through machine learning, a relationship among the biological information, the emotional information, and the environmental information based on the biological information, the emotional information, and the environmental information.
    Type: Application
    Filed: June 28, 2019
    Publication date: September 23, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Yohei KATAYAMA
  • Publication number: 20210282154
    Abstract: A transmitter includes a first measurement unit configured to measure a radio wave environment between the transmitter and a receiver for an individual wireless resource, a transmission control unit configured to determine the wireless resource and a parameter on a basis of the measurement result of the radio wave environment, an encoder unit configured to perform distributed coding of the bit sequence on a basis of the parameter, and a transmission unit configured to transmit information representing the determined wireless resource and the distributed coded bit sequence, by using the determined wireless resource.
    Type: Application
    Filed: June 28, 2019
    Publication date: September 9, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hideya SO, Yohei KATAYAMA, Kento YOSHIZAWA, Takafumi FUJITA
  • Publication number: 20210274421
    Abstract: A wireless communication system includes three or more wireless communication apparatuses and a control apparatus, wherein the control apparatus includes a setting unit configured to determine, for each of a plurality of paths from a first one of the wireless communication apparatuses to a second one of the wireless communication apparatuses, a total product value being a result of computing a total product of arrival probabilities of radio frames of respective radio sections constituting the path and a search unit configured to select a path, among the plurality of paths, with the number of transmission times of the radio frame for each of the paths being a predetermined number of times or smaller and the total product value being a predetermined threshold or more.
    Type: Application
    Filed: June 25, 2019
    Publication date: September 2, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Takafumi FUJITA, Hideya SO, Kento YOSHIZAWA
  • Publication number: 20210274456
    Abstract: A radio communication method executed by a control apparatus controlling a base station apparatus performing communication with a terminal in a predetermined region, and includes determining whether there is the terminal that is asynchronized in communication with the base station apparatus transmitting a synchronization signal, and controlling, in a case where it is determined that there is the asynchronized terminal, the base station apparatus to increase an allocation time of the synchronization signal in compliance with a radio scheme used by the asynchronized terminal or to shorten an allocation cycle of the synchronization signal.
    Type: Application
    Filed: April 8, 2019
    Publication date: September 2, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Atsushi TANIGUCHI, Kenji SHIMIZU, Takahiro YAMAZAKI, Maiko NAYA
  • Publication number: 20210235470
    Abstract: A wireless communication system includes a plurality of wireless communication apparatuses that transmit a wireless frame to a terminal, and a control apparatus, and the wireless communication apparatus transmits information representing the number of retransmissions of the wireless frame to the control apparatus, and the control apparatus acquires the information representing the number of retransmissions of the wireless frame, selects the wireless communication apparatus in accordance with the number of retransmissions, and causes the selected wireless communication apparatus to start transmitting the wireless frame.
    Type: Application
    Filed: June 21, 2019
    Publication date: July 29, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Takafumi FUJITA, Kento YOSHIZAWA, Hideya SO
  • Publication number: 20210227538
    Abstract: There is provided a wireless communication method in a wireless communication system including a plurality of base station apparatuses, a plurality of wireless signal processing apparatuses configured to perform signal processing that corresponds to each of a plurality of wireless schemes, and a control apparatus configured to control a transmission timing of signals in the base station apparatus and the wireless signal processing apparatus, the method including: determining a combination of the base station apparatus and the wireless signal processing apparatus that perform communication at each predetermined time by the control apparatus such that there is less overlap in time to establish a communication path between the wireless signal processing apparatus and each of a plurality of base station apparatuses that use the same wireless signal processing apparatus, in which the base station apparatus and the wireless signal processing apparatus perform communication by switching a determined combination of t
    Type: Application
    Filed: April 4, 2019
    Publication date: July 22, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Atsushi TANIGUCHI, Kenji SHIMIZU, Takahiro YAMAZAKI, Maiko NAYA
  • Publication number: 20210160914
    Abstract: This invention provides a radio communication method in a radio communication system including a base station apparatus and a radio signal processing apparatus for communicating with the base station apparatus, the radio communication method including granting radio control information that includes at least information specifying a radio scheme to be used as a parameter required for radio communication, to a packet and transmitting the packet from which the radio control information has been removed, by the radio scheme specified by the radio control information granted to the packet.
    Type: Application
    Filed: April 5, 2019
    Publication date: May 27, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Atsushi TANIGUCHI, Kenji SHIMIZU, Takahiro YAMAZAKI, Maiko NAYA, Takashi SHIMIZU
  • Publication number: 20210112549
    Abstract: A wireless communication method is executed by a wireless communication system including one or more wireless terminals and a wireless communication apparatus. The wireless communication apparatus generates wireless scheme schedule information, which is information related to a schedule of a slot allocated to an uplink signal and a downlink signal of a predetermined wireless scheme, generates a downlink signal to be transmitted in the slot to the wireless terminal based on the wireless scheme schedule information, and transmits a beacon signal including the wireless scheme schedule information in the slot. The wireless terminal receives the beacon signal, in the slot, acquires the wireless scheme schedule information from the beacon signal, and generates an uplink signal to be transmitted in the slot to the wireless communication apparatus, based on the wireless scheme schedule information.
    Type: Application
    Filed: April 8, 2019
    Publication date: April 15, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yohei KATAYAMA, Atsushi TANIGUCHI, Kenji SHIMIZU, Takahiro YAMAZAKI, Maiko NAYA
  • Publication number: 20210092628
    Abstract: An environmental information acquisition method is performed by an environmental information acquisition apparatus that acquires a measurement result of a radio wave environment. The environmental information acquisition method includes distributing software of each radio scheme to one or more base station apparatuses measuring a radio wave environment of the radio scheme based on the software of the radio scheme, instructing the one or more base station apparatuses to measure the radio wave environment, and acquiring the measurement result of the radio wave environment from the one or more base station apparatuses measuring based on the software the radio wave environment in multiple sections set across an area.
    Type: Application
    Filed: April 4, 2019
    Publication date: March 25, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Maiko NAYA, Kenji SHIMIZU, Takahiro YAMAZAKI, Atsushi TANIGUCHI, Yohei KATAYAMA
  • Publication number: 20210037371
    Abstract: A communication control apparatus includes a communication parameter acquisition unit that acquires at least one second communication parameter that is a candidate for a first communication parameter indicating a communication parameter to be assigned to a communication apparatus and indicates a communication parameter suitable for regional characteristics indicating a communication environment in a region where the communication apparatus is installed, a setting file storage unit that stores a setting file corresponding to each second communication parameter, a setting file acquisition control unit that acquires the setting file and stores the acquired setting file in the setting file storage unit, and a communication parameter assignment unit that determines the first communication parameter from among the second communication parameters acquired by the communication parameter acquisition unit and assigns the determined first communication parameter to the communication apparatus.
    Type: Application
    Filed: April 4, 2019
    Publication date: February 4, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Atsushi TANIGUCHI, Kenji SHIMIZU, Yohei KATAYAMA, Takahiro YAMAZAKI, Maiko NAYA
  • Publication number: 20210029630
    Abstract: An access point management method for managing a plurality of access points capable of providing wireless communication services in accordance with a plurality of wireless standards to a radio terminal apparatus includes acquiring plural pieces of request information which are used for requesting providing of the wireless communication service and include information indicating an area in which the wireless communication service is provided, selecting the access point assigned to each wireless communication service, based on the area requested by the plural pieces of request information acquired and characteristics of a wireless standard provided in the wireless communication service, and transmitting a request signal for deploying the wireless communication service corresponding to the request information, to the access point selected.
    Type: Application
    Filed: April 8, 2019
    Publication date: January 28, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takahiro YAMAZAKI, Kenji SHIMIZU, Atsushi TANIGUCHI, Yohei KATAYAMA, Maiko NAYA
  • Publication number: 20200216634
    Abstract: Provided are a non-aqueous suspension exhibiting an electrorheological effect and a damper constructed using the non-aqueous suspension. A non-aqueous suspension exhibiting an electrorheological effect, including a non-aqueous liquid; and organic polymer particles dispersed in the non-aqueous liquid, wherein the organic polymer particles have at least one type of ion in the inside or on the surface of the organic polymer particles, wherein when a 5 kV/mm voltage is applied between a pair of electrodes, the logarithmic value of frequency factor in Arrhenius equation for the current density (?A/cm2) flowing between the electrodes through the non-aqueous suspension is 20 or more.
    Type: Application
    Filed: July 26, 2018
    Publication date: July 9, 2020
    Inventors: Tomohiro OKADA, Yohei KATAYAMA
  • Publication number: 20200166097
    Abstract: The present invention provides a shock absorber capable of improving responsiveness during an extension stroke without leading to an increase in an axial length. A shock absorber includes a chamber provided on a one-side end of a pilot valve and disposed in communication with a cylinder upper chamber, a communication passage configured to establish communication between the chamber and a cylinder lower chamber via a compression-side passage, and a check valve configured to permit hydraulic fluid in the communication passage to flow into the cylinder lower chamber during an extension stroke.
    Type: Application
    Filed: July 24, 2018
    Publication date: May 28, 2020
    Inventors: Kosuke KADOKURA, Yohei KATAYAMA, Takao NAKADATE, Osamu YUNO, Shunsuke MORI
  • Patent number: 10012282
    Abstract: A flow of hydraulic oil induced by sliding movement of a piston in a cylinder is controlled by a damping force generating mechanism to generate a damping force. A flow of hydraulic oil from a casing of the damping force generating mechanism toward a reservoir is regulated by a passage groove formed on the bottom of the casing so as to be directed downward in the reservoir. Thus, the hydraulic oil is efficiently supplied to a base valve from the damping force generating mechanism even when the hydraulic oil is sucked from the reservoir into a cylinder lower chamber through a passage in the base valve during the extension stroke of a piston rod. Therefore, it is possible to suppress a sharp reduction in pressure in the lower part of the reservoir and hence possible to suppress the occurrence of aeration and to obtain stable damping force characteristics.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: July 3, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yusei Kimura, Yohei Katayama, Naofumi Harada, Satoshi Shimazaki
  • Patent number: 9856939
    Abstract: A shock absorber includes a reservoir between a cylinder and an outer tube, in which hydraulic liquid and gas are sealed; a middle tube between the cylinder and the outer tube; a connecting pipe in the lateral wall of the middle tube, which includes a tip end extending toward the outside of the outer tube; an opening in the outer tube, allowing hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and a partition member in the reservoir, which includes a partition wall that configured to regulate hydraulic liquid's upward flow from the opening in the reservoir. The partition member is made of flexible resin or rubber, provided with a fitting hole, and fitted to the connecting pipe with interference with the connecting pipe inserted through the hole.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: January 2, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroyuki Matsumoto, Shigeo Katayama, Yohei Katayama, Umi Tanabe, Yusei Kimura, Yoshie Midorikawa, Hideki Hata, Osamu Shioume
  • Patent number: 9309948
    Abstract: A shock absorber including a damping force generation mechanism (30a) includes a spring member (106a) having radially extending spring portions (117) having high spring constants and circumferentially extending spring portions (118) having low spring constants. The radially extending spring portions and the circumferentially extending spring portions are integrally configured so that biasing forces thereof act dynamically linearly. An annular stepped portion limits strokes of the circumferentially extending spring portions and is provided on a cylindrical wall portion of a pilot body. As a result, within a range of damping force control, only the radially extending spring portions of the spring member are elastically deformed, whereby the durability of the spring member is enhanced, and only biasing forces of the radially extending spring portions of the spring member act on a pilot valve member, and thereby variation in a damping force is reduced so that the performance is improved.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: April 12, 2016
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yohei Katayama, Hiroki Ohara, Sadatomo Matsumura
  • Publication number: 20160017951
    Abstract: A shock absorber includes a reservoir between a cylinder and an outer tube, in which hydraulic liquid and gas are sealed; a middle tube between the cylinder and the outer tube; a connecting pipe in the lateral wall of the middle tube, which includes a tip end extending toward the outside of the outer tube; an opening in the outer tube, allowing hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and a partition member in the reservoir, which includes a partition wall that configured to regulate hydraulic liquid's upward flow from the opening in the reservoir. The partition member is made of flexible resin or rubber, provided with a fitting hole, and fitted to the connecting pipe with interference with the connecting pipe inserted through the hole.
    Type: Application
    Filed: July 13, 2015
    Publication date: January 21, 2016
    Inventors: Hiroyuki MATSUMOTO, Shigeo KATAYAMA, Yohei KATAYAMA, Umi TANABE, Yusei KIMURA, Yoshie MIDORIKAWA, Hideki HATA, Osamu SHIOUME
  • Publication number: 20150276000
    Abstract: A flow of hydraulic oil induced by sliding movement of a piston in a cylinder is controlled by a damping force generating mechanism to generate a damping force. A flow of hydraulic oil from a casing of the damping force generating mechanism toward a reservoir is regulated by a passage groove formed on the bottom of the casing so as to be directed downward in the reservoir. Thus, the hydraulic oil is efficiently supplied to a base valve from the damping force generating mechanism even when the hydraulic oil is sucked from the reservoir into a cylinder lower chamber through a passage in the base valve during the extension stroke of a piston rod. Therefore, it is possible to suppress a sharp reduction in pressure in the lower part of the reservoir and hence possible to suppress the occurrence of aeration and to obtain stable damping force characteristics.
    Type: Application
    Filed: March 18, 2015
    Publication date: October 1, 2015
    Inventors: Yusei KIMURA, Yohei KATAYAMA, Naofumi HARADA, Satoshi SHIMAZAKI
  • Patent number: 8965632
    Abstract: [Object] The present invention provides a suspension control apparatus that allows miniaturization of a solenoid valve. [Solution] When a controller is started up by a power source controller (a power source unit), the controller switches a control current from 0 ampere to a maximum current value I6 at the same time as the startup. After that, the control shifts to normal control. As a result, even if a hysteresis of a damping force characteristic is large relative to the control current, it is possible to promptly move a solenoid valve to a position to be used in the normal control.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: February 24, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Toru Uchino, Ryusuke Hirao, Yohei Katayama, Hiroyuki Yabe, Hiroki Ohara
  • Publication number: 20140324289
    Abstract: [Object] The present invention provides a suspension control apparatus that allows miniaturization of a solenoid valve. [Solution] When a controller is started up by a power source controller (a power source unit), the controller switches a control current from 0 ampere to a maximum current value I6 at the same time as the startup. After that, the control shifts to normal control. As a result, even if a hysteresis of a damping force characteristic is large relative to the control current, it is possible to promptly move a solenoid valve to a position to be used in the normal control.
    Type: Application
    Filed: July 9, 2014
    Publication date: October 30, 2014
    Inventors: Toru UCHINO, Ryusuke HIRAO, Yohei KATAYAMA, Hiroyuki YABE, Hiroki OHARA