Patents Assigned to National Institute of Information and Communications Technology
  • Patent number: 10686529
    Abstract: An optical communication system is arranged to bring out potential capabilities of mode-division multiplexing (MDM). The optical communication system includes a hologram medium in which holograms are multiplex-recorded so as to correspond to respective spatial modes of signal light transmitted by a multi-mode fiber (MMF). A phase plate modulates phases of the respective spatial modes so as to reduce a spatial overlap between the spatial modes, and is provided on a side of the hologram medium on which signal light enters the hologram medium.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: June 16, 2020
    Assignees: National University Corporation Hokkaido University, Optoquest Co., Ltd., National Institute of Information and Communications Technology
    Inventors: Atsushi Okamoto, Tomokazu Oda, Taketoshi Takahata, Shusaku Noda, Naoya Wada
  • Publication number: 20200168460
    Abstract: A semiconductor substrate includes a single crystal Ga2O3-based substrate and a polycrystalline substrate that are bonded to each other. A thickness of the single crystal Ga2O3-based substrate is smaller than a thickness of the polycrystalline substrate, and a fracture toughness value of the polycrystalline substrate is higher than a fracture toughness value of the single crystal Ga2O3-based substrate.
    Type: Application
    Filed: July 9, 2018
    Publication date: May 28, 2020
    Applicants: TAMURA CORPORATION, SICOXS Corporation, National Institute of Information and Communications Technology
    Inventors: Akito KURAMATA, Shinya WATANABE, Kohei SASAKI, Kuniaki YAGI, Naoki HATTA, Masataka HIGASHIWAKI, Keita KONISHI
  • Publication number: 20200150452
    Abstract: Information indicating a shape of a screen, a shape of a viewing area and a relative positional relationship between the viewing area and the screen is acquired. A shared area in which a three-dimensional image presented by a three-dimensional display is to be arranged in order to be observed from any position in the viewing area is created based on the acquired information. Based on the acquired information, a specific area in which a three-dimensional image presented by the three-dimensional display is to be arranged in order to be observed from a specific position in the viewing area is created. The data indicating the created shared area and the data indicating the specific area are generated.
    Type: Application
    Filed: May 11, 2017
    Publication date: May 14, 2020
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Shunsuke Yoshida
  • Publication number: 20200144377
    Abstract: A Ga2O3-based semiconductor device includes a Ga2O3-based crystal layer including a donor, and an N-doped region formed in at least a part of the Ga2O3-based crystal layer.
    Type: Application
    Filed: April 26, 2018
    Publication date: May 7, 2020
    Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, TAMURA CORPORATION, NOVEL CRYSTAL TECHNOLOGY, INC.
    Inventors: Masataka HIGASHIWAKI, Yoshiaki NAKATA, Takafumi KAMIMURA, Man Hoi WONG, Kohei SASAKI, Daiki WAKIMOTO
  • Patent number: 10642064
    Abstract: A three-dimensional display, wherein an area in which eyes of observers are to be positioned when the observers observe a three-dimensional image is predefined as a viewing area, the viewing area is defined to be circular and surround a light ray controller at a position farther upward than a top board of a table, a light ray group is emitted to an outer peripheral surface of the light ray controller from a light ray generator arranged below the top board, and the light ray controller is formed such that the plurality of light rays emitted to a plurality of portions that are different from one another and arranged in a ridge line direction are transmitted through the plurality of portions while respectively being diffused in a virtual plane, and is formed such that center lines of a plurality of transmitted diffused light rays pass through the viewing area.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: May 5, 2020
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Shunsuke Yoshida
  • Patent number: 10629185
    Abstract: [Object] An object is to provide a statistical acoustic model adaptation method capable of efficient adaptation of an acoustic model using DNN with training data under a specific condition and achieving higher accuracy. [Solution] A method of speaker adaptation of an acoustic model using DNN includes the steps of: storing speech data 90 to 98 of different speakers separately in a first storage device; preparing speaker-by-speaker hidden layer modules 112 to 120; performing preliminary learning of all layers 42, 44, 110, 48, 50, 52 and 54 of a DNN 80 by switching and selecting the speech data 90 to 98 while dynamically replacing a specific layer 110 with hidden layer modules 112 to 120 corresponding to the selected speech data; replacing the specific layer 110 of the DNN that has completed the preliminary learning with an initial hidden layer; and training the DNN with speech data of a specific speaker while fixing parameters of layers other than the initial hidden layer.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: April 21, 2020
    Assignee: National Institute of Information and Communications Technology
    Inventors: Shigeki Matsuda, Xugang Lu
  • Patent number: 10620702
    Abstract: An internal device of a brain-machine interface system includes: an electrode group including N electrodes, N being 2 or more; an amplification element group including N amplification elements; a communicator communicating with an external device; and a controller selectively executing one of: a normal operation mode in which electroencephalogram signals acquired through the N electrodes are supplied to the amplification element group in a manner that each of the N electrodes corresponds to a respective one of the N amplification elements, and N amplified electroencephalogram signals are transmitted; and a noise-reduction operation mode in which an electroencephalogram signal acquired through an M electrode of the electrode group is supplied to the amplification element group in a manner that each M electrode corresponds to respective plural ones of the amplification elements, and an M amplified electroencephalogram signal is transmitted, M being smaller than N.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: April 14, 2020
    Assignees: NIHON KOHDEN CORPORATION, OSAKA UNIVERSITY, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Kaoru Imajo, Katsuyoshi Suzuki, Masayuki Hirata, Seiji Kameda, Takafumi Suzuki, Hiroshi Ando
  • Patent number: 10607602
    Abstract: An object is to provide a speech recognition device with improved recognition accuracy using characteristics of a neural network. A speech recognition device includes: an acoustic model 308 implemented by a RNN (recurrent neural network) for calculating, for each state sequence, the 45 posterior probability of a state sequence in response to an observed sequence consisting of prescribed speech features obtained from a speech; a WFST 320 based on S-1HCLG calculating, for each word sequence, posterior probability of a word sequence in response to a state sequence; and a hypothesis selecting unit 322, performing speech recognition of the speech signal based on a score calculated for each hypothesis of a 50 word sequence corresponding to the speech signal, using the posterior probabilities calculated by the acoustic model 308 and the WFST 320 for the input observed sequence.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: March 31, 2020
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Naoyuki Kanda
  • Patent number: 10608748
    Abstract: To provide a method and device capable of easily measuring the CMRR vs. frequency characteristics of an optical receiver. Light having a measurement frequency (? [hz]) is split into two different paths, and a first optical two-tone signal, which is signal light and has a frequency difference (???? [hz]), and a second optical two-tone signal, which is local light and has a frequency difference (?+?? [hz]), are obtained and input into a coherent receiver to be measured, wherein electrical signals output from the receiver are measured to obtain both the ratio of the intensity of a signal component having the frequency ???? [hz] to the intensity of a signal component having the frequency ? [hz], which corresponds to the CMRR on the signal light side, and the ratio of the intensity of a signal component having the frequency ?+?? [hz] to the intensity of the signal component having the frequency ? [hz], which corresponds to the CMRR on the local light side.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: March 31, 2020
    Assignee: National Institute of Information and Communications Technology
    Inventors: Keizo Inagaki, Tetsuya Kawanishi, Atsushi Kanno, Naokatsu Yamamoto
  • Patent number: 10600837
    Abstract: An electric field imaging device is provided with which it is possible to visualize as a dynamic state an electromagnetic field intensity distribution and a phase delay/advance distribution in the vicinity of a product, using a sample of the actual product without lead-out lines. The electric field imaging device includes: an antenna which accepts a high-frequency signal emitted by the sample as an input; an electrooptic (EO) crystal plate which is a frequency fRF high-frequency electric field sensor; a flashing light source which radiates polarized light onto the EO crystal plate; an optical system leading to an analyzer for detecting phase changes in polarized light obtained by means of the EO crystal plate; an image capturing device which converts an in-plane distribution of optical beam from the analyzer into an electrical signal; and an information processing device which processes and displays an output signal from the image capturing device.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: March 24, 2020
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Masahiro Tsuchiya
  • Patent number: 10598964
    Abstract: To provide a method whereby a bias voltage capable of easily realizing a required extinction ratio can be controlled by utilizing a high-extinction ratio modulator even when a generic AD converter/control board is used, and a device for realizing the method. In the present invention, the step quantity (variation quantity) ?V of a control voltage is no more than 0.1 times the half-wave voltage V? [V]. For example, in the case of searching for the minimum point, the light intensity is measured when a bias that is larger by the step voltage ?V and a bias that is smaller by the step voltage ?V are applied, the current bias voltage being used as a reference, and the bias voltage is moved toward the smaller of the measured light intensities. The process of setting the moved bias voltage as a reference, comparing the light intensities for the bias points in both neighboring positions, and changing the reference bias voltage is then repeated.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: March 24, 2020
    Assignee: National Institute of Information and Communications Technology
    Inventors: Atsushi Kanno, Tetsuya Kawanishi
  • Patent number: 10571707
    Abstract: A three-dimensional image observation system includes a three-dimensional display (100) and a guide frame (410). The three-dimensional display is constituted by a light ray controller (1), a plurality of light ray generators (2), a control device (3) and a storage device (4). Further, the three-dimensional display (100) is provided at a table (5). In the three-dimensional display (100), the area where eyes of observers (10) are to be positioned when the observers observe a three-dimensional image is predefined as a viewing area (500), and the guide frame (410) visually guides the eyes of the observers (10) from the outside of the viewing area (500) to the inside of the viewing area.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: February 25, 2020
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Shunsuke Yoshida
  • Publication number: 20200054284
    Abstract: An internal device (1) is implanted in a living body (300). A control section (6) causes a communication section (5) to wirelessly transmit data corresponding to electroencephalogram signals of the living body (300) which are detected through a group of N (N is 2 or more) electrodes, to an external device (200). When the communication section (5) receives a designation signal designating a group of M electrode(s) (2a), M being smaller than N, the communication section (5) is caused to transmit data corresponding to electroencephalogram signals of the living body (300) which are detected through the group of M electrode(s) (2a), to the external device (200) in real time.
    Type: Application
    Filed: February 9, 2018
    Publication date: February 20, 2020
    Applicants: NIHON KOHDEN CORPORATION, OSAKA UNIVERSITY, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SPChange, LLC.
    Inventors: Kaoru IMAJO, Katsuyoshi SUZUKI, Masayuki HIRATA, Seiji KAMEDA, Takafumi SUZUKI, Hiroshi ANDO, Takatsugu KAMATA
  • Publication number: 20190393956
    Abstract: A free-space optical communication apparatus, transmitting and receiving light waves to and from an artificial satellite orbiting an earth orbit, includes a transmission light wave generating unit generating a transmission light wave to be transmitted to the artificial satellite, a telescope having an aperture for collecting a reception light wave emitted from the artificial satellite, the aperture adapted to collect a path propagation light propagating through a space including a propagation path for correcting an uplink transmission light wavefront generated by the transmission light wave generating unit to the artificial satellite, a wavefront sensor detecting wavefront distortions of the reception light wave and the uplink propagation path, a control unit generating a control signal based on the wavefront distortions, and a deformable mirror correcting the uplink propagation path based on the control signal to guide the transmission light wave to the artificial satellite through the telescope.
    Type: Application
    Filed: January 19, 2018
    Publication date: December 26, 2019
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Dimitar KOLEV, Morio TOYOSHIMA
  • Patent number: 10514587
    Abstract: To provide an optical comb generation device and an optical comb signal generation method capable of stably generating an optical comb signal having an optical frequency interval exceeding the drive electric signal band of a modulator.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: December 24, 2019
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Takahide Sakamoto, Naokatsu Yamamoto, Atsushi Matsumoto
  • Patent number: 10496928
    Abstract: A question-answering system capable of appropriately answering a non-factoid question. The question-answering system responsive to a question, for taking out answer candidates from an object document storage unit; extracting plausible ones from the answer candidates; recognizing causal relation expression included in extracted answer candidates; determining whether or not a recognized causal relation is relevant as an answer; generating a feature vector related to a combination of the question and the searched answer candidate; and for calculating, when a feature vector is given, a score indicating a degree of how correct an answer candidate is as an answer to the question, for the question and the answer candidate as a source of the feature vector, and for outputting, as the answer to the question, an answer candidate having the highest score.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: December 3, 2019
    Assignee: National Institute of Information and Communications Technology
    Inventors: Jonghoon Oh, Kentaro Torisawa, Chikara Hashimoto, Motoki Sano, Stijn De Saeger, Kiyonori Ootake
  • Publication number: 20190351547
    Abstract: A holding apparatus includes a first detection unit configured to detect an indicated holding object, a second detection unit configured to detect, when the first detection unit detects the holding object, a tag proximate to the holding object, and a holding part configured to hold a container provided with the tag based on tag information of the tag detected by the second detection unit.
    Type: Application
    Filed: May 10, 2019
    Publication date: November 21, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Yuji ONUMA, Komei SUGIURA
  • Patent number: 10467525
    Abstract: [Object] An object is to provide a training method of improving training of a recurrent neural network (RNN) using time-sequential data. [Solution] The training method includes a step 220 of initializing the RNN, and a training step 226 of training the RNN by designating a certain vector as a start position and optimizing various parameters to minimize error function. The training step 226 includes: an updating step 250 of updating RNN parameters through Truncated BPTT using consecutive N (N?3) vectors having a designated vector as a start point and using a reference value of a tail vector as a correct label; and a first repetition step 240 of repeating the process of executing the training step by newly designating a vector at a position satisfying a prescribed relation with the tail of N vectors used at the updating step until an end condition is satisfied. The vector at a position satisfying the prescribed relation is positioned at least two vectors behind the designated vector.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: November 5, 2019
    Assignee: National Institute of Information and Communications Technology
    Inventor: Naoyuki Kanda
  • Patent number: 10437867
    Abstract: [Object] An object of the present invention is to provide a system for collecting elements as a basis for generating a social scenario useful for people to make well-balanced good decision. [Solution] A scenario generating apparatus includes: a causality phrase pair DB 70 storing causality phrase pairs; synonimity generators 600, 602 and 604, searching, for each of the causality phrase pairs, causality phrase pairs having a cause phrase with causal consistency with the result phrase of the causality phrase pair, and generating join information for joining causality phrase pairs; join relation DB 610 storing the join information; and a causality joining unit 612 joining, to a result phrase of a causality phrase pair, a causality phrase pair having a cause phrase with causal consistency with the phrase by using the join information, and thereby linking causality. A join relation generator 606 that finds a hidden relation between phrases and linking causality phrase pairs may be provided.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: October 8, 2019
    Assignee: National Institute of Information and Communications Technology
    Inventors: Chikara Hashimoto, Kentaro Torisawa, Motoki Sano, Yulan Yan, Yutaka Kidawara
  • Patent number: 10430717
    Abstract: A system for collecting elements as a basis for generating a social scenario useful to make a well-balanced good decision. A complex predicate template collecting apparatus includes: a simple predicate template DB storing simple predicate templates having positive or negative polarity values added; an object noun dictionary; a complex predicate template candidate extractor extracting complex predicate template candidates each formed of a combination of a word specified by the object noun dictionary and a simple predicate template, from a WEB archive; a sahen-noun polarity adder, a quantifier noun polarity adder and a trouble-noun polarity adder, determining polarity of a noun in each of the complex predicate template candidate; and a complex predicate template polarity calculator calculating polarity of a complex predicate template candidate by a combination of the polarity of the noun and the polarity of the simple predicate template included in the complex predicate template.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: October 1, 2019
    Assignee: National Institute of Information and Communications Technology
    Inventors: Chikara Hashimoto, Kentaro Torisawa, Motoki Sano, Yulan Yan, Yutaka Kidawara