Patents by Inventor Tsuyoshi Tamaki

Tsuyoshi Tamaki 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: 20190080262
    Abstract: A work determination system includes: a biological signal obtaining unit obtaining a biological signal of a worker from a sensor attached to the worker during work; a feature extraction computation unit computing a feature extraction of the obtained biological signal of the worker; a work determination unit determining a work of the worker on the basis of a comparison result between the computed feature extraction of the biological signal of the worker and learning data generated in advance; and a learning unit generating the learning data, wherein the learning unit generates a musculoskeletal model corresponding to each worker, generates a quasi biological signal by reproducing a work of a determination target with the musculoskeletal model, computes a feature extraction of the quasi biological signal, and generates the learning data by associating, with each worker, the work of the determination target and a feature extraction distribution of the quasi biological signal.
    Type: Application
    Filed: July 9, 2018
    Publication date: March 14, 2019
    Inventors: Toru YAZAKI, Yutaka UEMATSU, Toshiaki TAKAI, Tsuyoshi TAMAKI
  • Publication number: 20180239855
    Abstract: A structural analysis method executed by a computer, includes acquiring model information; evaluating based on the acquired model information, a degree of agglomeration of a model subject to analysis; and selecting for the model, a direct method or an iterative method as an algorithm to solve simultaneous linear equations of a structural analysis solver that uses a finite element method, the direct method or the iterative method being selected based on a result of evaluation of the degree of agglomeration of the model.
    Type: Application
    Filed: April 25, 2018
    Publication date: August 23, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takanori NEGISHI, Yasuhiro KAWASHIMA, Kazuya YAMAURA, Masao FUKUSHIMA, Tsuyoshi TAMAKI, Toshio ARAI, Toshiyasu OHARA
  • Publication number: 20180239854
    Abstract: A structure analysis device includes a memory and a processor configured to obtain model information, evaluate a size of a model in accordance with the model information, select, in accordance with the evaluated size, either a direct method or an iterative method as a first algorithm of a simultaneous linear equation of a structure analysis solver that uses a finite element method, and execute structure analysis of the model by using the first algorithm.
    Type: Application
    Filed: April 24, 2018
    Publication date: August 23, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takanori NEGISHI, Yasuhiro KAWASHIMA, Kazuya YAMAURA, Masao FUKUSHIMA, Tsuyoshi TAMAKI, Toshio ARAI, Toshiyasu OHARA
  • Patent number: 9408213
    Abstract: When a frequency channel is shared between adjacent cells in a wireless communication system of time-division duplex operation utilizing a white space, more efficient communications can be achieved. In a wireless communication system of time-division duplex operation utilizing a white space, which is a temporally and spatially unused frequency, to perform wireless communications and having frames in which downstream and upstream subframes are alternately arranged on the time axis, a network controller calculates a common split position, which is to be used in synchronization between base stations sharing a frequency, from collected information in response to a frequency sharing trigger and synchronizes the determined split position between the base stations, thereby allowing the frequency channel to be shared.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: August 2, 2016
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Takashi Ishikawa, Shinji Murai, Tsuyoshi Tamaki
  • Patent number: 9265010
    Abstract: The objective of the invention is to improve the communication performance of a secondary system within such a range that does not affect a primary system. A wireless communication system comprises: a primary system that can use a given frequency on a priority basis; secondary wireless communication systems each of which is operated with the same frequency; and a network control apparatus that controls the secondary wireless communication systems. The network control apparatus comprises: a primary system information acquiring unit that acquires information of the primary system; a secondary system information acquiring unit that acquires communication quality information of the secondary wireless communication systems; and an optimum computing unit that calculates, on the basis of the primary and secondary system information acquiring units, the transmission powers of a plurality of base stations of the secondary wireless communication systems.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: February 16, 2016
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Shinji Murai, Takashi Ishikawa, Tsuyoshi Tamaki
  • Publication number: 20150319754
    Abstract: When a carrier aggregation using a macro cell of a legacy carrier as a primary cell and using a small cell of a new carrier type as a secondary cell is performed, transmission of a control channel (PUCCH) of an uplink is concentrated on an uplink of the macro cell and frequency efficiency is degraded. For this reason, in a state in which the macro cell is configured as the primary cell, a serving cell transmitting the PUCCH is configured to a terminal and the terminal transmits the PUCCH using the configured serving cell.
    Type: Application
    Filed: January 16, 2013
    Publication date: November 5, 2015
    Inventors: Hitoshi ISHIDA, Tomonori YAMAMOTO, Satoshi TAMAKI, Tsuyoshi TAMAKI
  • Patent number: 9083450
    Abstract: A macro base station includes a communication prohibited period setting unit of setting an uplink communication prohibited period to a user equipment belonging to the base station, and prohibits an uplink communication from the user equipment to a wireless communication base station per se during the uplink communication prohibited period. The user equipments belonging to the wireless communication base station per se and the second base station are divided into plural groups, and the uplink communication prohibited period is set to different time periods for the respective groups. Thereby, a communication characteristic is prohibited from being deteriorated at the second base station by an interference affected with the second base station separately from the first base station by the user equipment communicating with the first base station in the uplink communication.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: July 14, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Shigenori Hayase, Tsuyoshi Tamaki, Tomonori Yamamoto, Rintaro Katayama
  • Publication number: 20150156775
    Abstract: When a frequency channel is shared between adjacent cells in a wireless communication system of time-division duplex operation utilizing a white space, more efficient communications can be achieved. In a wireless communication system of time-division duplex operation utilizing a white space, which is a temporally and spatially unused frequency, to perform wireless communications and having frames in which downstream and upstream subframes are alternately arranged on the time axis, a network controller calculates a common split position, which is to be used in synchronization between base stations sharing a frequency, from collected information in response to a frequency sharing trigger and synchronizes the determined split position between the base stations, thereby allowing the frequency channel to be shared.
    Type: Application
    Filed: June 28, 2013
    Publication date: June 4, 2015
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Takashi Ishikawa, Shinji Murai, Tsuyoshi Tamaki
  • Publication number: 20150148091
    Abstract: The objective of the invention is to improve the communication performance of a secondary system within such a range that does not affect a primary system. A wireless communication system comprises: a primary system that can use a given frequency on a priority basis; secondary wireless communication systems each of which is operated with the same frequency; and a network control apparatus that controls the secondary wireless communication systems. The network control apparatus comprises: a primary system information acquiring unit that acquires information of the primary system; a secondary system information acquiring unit that acquires communication quality information of the secondary wireless communication systems; and an optimum computing unit that calculates, on the basis of the primary and secondary system information acquiring units, the transmission powers of a plurality of base stations of the secondary wireless communication systems.
    Type: Application
    Filed: June 28, 2013
    Publication date: May 28, 2015
    Applicant: HITACHI KOKUSAI ELECTRIC INC.,
    Inventors: Shinji Murai, Takashi Ishikawa, Tsuyoshi Tamaki
  • Publication number: 20150087324
    Abstract: A base station is provided with a plurality of radio units that communicate with a terminal, and a control device connected to the plurality of radio units. When there is a large number of terminals positioned at a boundary of the communication areas of a first radio unit and a second radio unit among the plurality of radio units, the control device makes a first cell ID of the first radio unit and a second cell ID of the second radio unit being identical.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 26, 2015
    Inventors: Hitoshi ISHIDA, Tomonori YAMAMOTO, Satoshi TAMAKI, Rintaro KATAYAMA, Eriko TAKEDA, Tsuyoshi TAMAKI
  • Patent number: 8971962
    Abstract: An optimum communication mode and an optimum antenna are selected according to traffic and a radio propagation status of a terminal. With the use of traffic information between a base station and the terminal, an SISO communication or an SIMO communication is conducted if the traffic is small. It is determined whether the MIMO communication should be conducted, or not, if the traffic is large. An antenna that can exert the effect as the MIMO communication is selected by using the radio propagation channel state information between the distributed antennas of the base station and the antenna of the terminal. Also, because the selection of the antenna is changed by conducting the MIMO communication, an antenna optimum for the terminal that conducts the SISO communication or the SIMO communication is re-selected taking the interference influence on the terminal that conducts the SISO communication or the SIMO communication into account.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: March 3, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Kingo Miyoshi, Tsuyoshi Tamaki
  • Patent number: 8942117
    Abstract: A frame time having a certain period of time is divided into: a time period (for inter-base-station time division multiplex communication) in which one of the base stations has a transmission right in the simultaneous transmission and carries out inter-base-station time division multiplex communication so as to avoid interference between the base stations; and a time period (for inter-base-station simultaneous communication) for communication which is simultaneously carried out between the plurality of base stations. Furthermore, the time periods are switched for the communication.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: January 27, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Tsuyoshi Tamaki, Takashi Yano, Yunjian Jia
  • Publication number: 20150023199
    Abstract: A wireless communication method uses first and second demodulation reference signals in channel estimation of data and control signals, respectively, in a wireless communication system including a base station and a terminal. The base station informs the terminal of N parameters of first to Nth parameters to determine signal sequences for the first demodulation reference signal with a control signal of a higher layer, and informs the terminal of one parameter to determine a signal sequence for the second demodulation reference signal. The terminal defines a signal sequence with the one parameter informed of as the second demodulation reference signal, demodulates and decodes a control signal of the lower layer using the defined second demodulation reference signal, and defines a signal sequence with one parameter of the first to the Nth parameters with a correctly decoded control signal of the lower layer as the first demodulation reference signal.
    Type: Application
    Filed: February 6, 2013
    Publication date: January 22, 2015
    Applicant: Hitachi, Ltd.
    Inventors: Hitoshi Ishida, Yunjian Jia, Tsuyoshi Tamaki
  • Publication number: 20140369216
    Abstract: Reception power of a terminal for a first communication scheme is measured. A propagation path loss between a base station and the terminal is calculated. The propagation path loss is estimated in a case where communications are conducted using a second communication scheme, and reception power of the terminal is estimated from output of the base station for the second communication scheme and the estimated propagation path loss. If the sufficiency and stability of the reception power are assumed, the switching from the first communication scheme to the second communication scheme is done. In this way, stable communications using the second communication scheme are ensured.
    Type: Application
    Filed: June 17, 2014
    Publication date: December 18, 2014
    Inventors: Tsuyoshi TAMAKI, Hirotake ISHII
  • Patent number: 8897161
    Abstract: To reduce an uplink interference in a network with a first base station of a large output and a second base station of a small output. Detecting the interference, the second base station urges the first base station to hand over a terminal causing it to the second base station. Multiple base stations and one or more terminals exist in this system, each terminal connects with one base station, and a serving base station is changed according to a communication state of each terminal. If the different second base station other than the first base station to which the terminal connects detects a large interference, the second base station will multicast transmit information for urging handover to the base stations except itself. The base station having received the information specifies a terminal giving the interference to the second base station, and makes it to be handed over thereto.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: November 25, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Kenzaburo Fujishima, Tsuyoshi Tamaki, Rintaro Katayama, Hitoshi Ishida
  • Patent number: 8891417
    Abstract: To secure a constant level or more of radio communication quality for each user equipment performing radio communication with a base station apparatus, and to increase the number of user equipment which the base station apparatus can accommodate under a condition of assuring the radio communication quality. In a radio communication system where there exist a base station apparatus having multiple antennas and user equipment for performing radio communication with a first antenna group including one or more of the antennas, the first antenna group is made configurable for each user equipment individually, and addition/deletion of the antenna to/from the first antenna group is performed based on the communication quality of each user equipment so that the number of antennas within the first antenna group may be minimized within a range satisfying a required value of the communication quality between the base station apparatus ad the user equipment.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: November 18, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Kenzaburo Fujishima, Tsuyoshi Tamaki, Yunjian Jia, Hitoshi Ishida
  • Patent number: 8801879
    Abstract: A process for production of a multilayer film that comprises a step in which an adhesive layer formed on a temporary base is situated along the lengthwise direction of the temporary base at a prescribed spacing and cut in such a manner that the plurality of sections which are to serve as adhesive films are partitioned from the other sections, and a step in which the adhesive films on the temporary base are moved onto a support film at a prescribed spacing along the lengthwise direction of the support film. The spacing between the adjacent adhesive films on the temporary base is different from the spacing between the adjacent adhesive films on the support film.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: August 12, 2014
    Assignee: Hitachi Chemical Company, Ltd.
    Inventor: Tsuyoshi Tamaki
  • Publication number: 20140219125
    Abstract: By a base station that is not limited to a cell concept, the system control cost is controlled and an area of high-communication-speed/high-communication-quality is expanded. There are provided fixed-cell support base-station devices 420 and 421 having functions of physical layer processing and higher layer processing according to the cell concept in the related art and an unfixed-area support base-station device 430 having a physical layer processing function that is not limited to the cell concept. The unfixed-cell support base-station device 430 performs physical layer signal processing for a terminal in a low throughput area and selects an arbitrary antenna group from antennas or antenna group linked to the fixed-cell support base stations 420 and 421, and the fixed-cell support base stations 420 and 421 transmit their own transmission signals and transmission signals directed to the terminal together.
    Type: Application
    Filed: August 29, 2012
    Publication date: August 7, 2014
    Applicant: HITACHI, LTD.
    Inventors: Yunjian Jia, Tsuyoshi Tamaki, Kenzaburo Fujishima, Hitoshi Ishida
  • Patent number: 8761041
    Abstract: A femto base station registers IDs of neighboring macro base stations and the ID of a terminal into a management device. When the femto base station detects that the communication state of a terminal in communication with the femto base station transited from active to idle, the femto base station hands off the communication session to one of the neighboring macro stations and enters the dormant state. When the macro base station detects that the communication state of the terminal transited from idle to active, the macro base station transmits an inquiry to the management device, identifies a femto base station to be started based on the terminal ID and the macro base station ID and starts the femto base station. When the femto base station is started, it is handed off from the macro base station to the femto base station to maintain the communication session of the terminal.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: June 24, 2014
    Assignee: Hitachi, Ltd.
    Inventor: Tsuyoshi Tamaki
  • Patent number: 8711774
    Abstract: There is provided a wireless communication system in which a feedback volume is reduced as exceeding a communication speed demanded by a mobile station. The wireless communication system includes: a plurality of base stations 102a and 102b having a plurality of antennas; a plurality of mobile stations 103a to 103d having a plurality of antennas; and a base station controller 101a collectively controlling a plurality of the base stations.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: April 29, 2014
    Assignee: Hitachi, Ltd.
    Inventor: Tsuyoshi Tamaki