Patents Assigned to National Institute of Information and Communications Technology
  • Publication number: 20240062072
    Abstract: A federated learning system in which a plurality of local servers repeatedly learn cooperatively through communications between the plurality of local servers and a central server via a network. The local server includes a decryption unit, a mean gradient calculation unit, a model updating unit, a validation error calculation unit, an encryption unit, and a local transmission unit that transmits at least one of a current local mean gradient and a current local validation error. The central server includes a central reception unit, a model selection unit, a weight determination unit, and a central transmission unit. The central reception unit receives encrypted current local models and at least one of current local training data counts, the current local mean gradients, and the current local validation errors from the plurality of respective local servers.
    Type: Application
    Filed: December 24, 2021
    Publication date: February 22, 2024
    Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY
    Inventors: Lihua WANG, Fuki YAMAMOTO, Seiichi OZAWA
  • Publication number: 20240054213
    Abstract: An attack information generation apparatus (2000) determines, for each of a plurality of executions of a target attack, the number of occurrences of one or more events by using a log (10) in its execution period. The attack information generation apparatus (2000) determines, for each of the events, whether or not the number of occurrences of that event determined for each of the plurality of executions of the target attack satisfies a predetermined condition. The attack information generation apparatus (2000) generates attack information (30) associating the target attack with the event whose number of occurrences is determined to satisfy the predetermined condition.
    Type: Application
    Filed: November 15, 2021
    Publication date: February 15, 2024
    Applicants: NEC Corporation, National Institute of Information and Communications Technology
    Inventors: Yusuke TAKAHASHI, Shingo YASUDA
  • Patent number: 11895039
    Abstract: A communication system according to the present disclosure includes: a required band calculation unit (12, 41) configured to calculate a required band for a plurality of flows received by a bridge apparatus (3), in which, for a flow including burst data among the plurality of flows, the required band calculation unit (12, 41) calculates the required band for the flow based on a data size of the burst data and an allowable delay of the flow; and a speed ratio calculation unit (32, 43) configured to calculate a relative ratio of communication speeds of the plurality of flows based on the required band for the plurality of flows. The bridge apparatus (3) transfers the plurality of flows to a data receiving apparatus (2) according to the relative ratio of the communication speeds.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: February 6, 2024
    Assignees: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATION TECHNOLOGY
    Inventors: Takeo Onishi, Taketoshi Nakajima, Toru Osuga, Satoko Itaya, Kenichi Maruhashi, Fumihide Kojima
  • Patent number: 11864141
    Abstract: In performing wireless communication between terminals to perform time difference measurement and propagation time measurement, first and second terminals that transmit a signal at least once in attempting space-time synchronization are included. The first terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the second terminal, adds a positive or negative phase to the measured reception phase, and makes a report to the second terminal. The second terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the first terminal, and makes a report to the first terminal. The first and second terminals obtain a time difference or propagation time according to a reception phase measured by a local device and reported from a counterpart, and obtain additional information based on a phase reflected in the time difference or propagation time.
    Type: Grant
    Filed: November 29, 2021
    Date of Patent: January 2, 2024
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Maki Yoshida, Nobuyasu Shiga, Satoshi Yasuda, Kenichi Takizawa
  • Patent number: 11861307
    Abstract: A request paraphrasing system 120 allowing a dialogue system to flexibly address to requests in various different manners of expression includes: a pre-processing unit 130 converting a user input 56 to a word vector sequence; and a neural paraphrasing model 94 trained in advance by machine learning to receive the word vector sequence as an input and paraphrasing a request represented by the word vector sequence to a request having a higher probability of obtaining an answer from a question-answering device 122 than the request before paraphrasing. As pre-processing, whether the user input 56 is a request or not may be determined and it may be paraphrased only when it is determined to be a request. Further, a classification model 98 may classify the input request to determine to which request class it belongs, and the classification may be input as one feature to neural paraphrasing model 94.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: January 2, 2024
    Assignee: National Institute of Information and Communications Technology
    Inventors: Yoshihiko Asao, Ryu Iida, Canasai Kruengkrai, Noriyuki Abe, Kanako Onishi, Kentaro Torisawa, Yutaka Kidawara
  • Patent number: 11838934
    Abstract: A communications network system includes a control unit, one or more wireless systems, and application equipment. The control unit acquires information about data that the application equipment communicates via the wireless systems, and acquires information about a wireless environment that has an impact on communications by the wireless systems. The control unit generates a plurality of communications policies that are delivered to the wireless systems, and manages the communications policies that are executed on the wireless systems. The wireless systems store the plurality of communications policies delivered from the control unit, and detect the status of communications, change the communications policies based on the detection result, and control information about data that the application equipment communicates via the wireless systems.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: December 5, 2023
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Kenichi Maruhashi, Satoko Itaya, Fumihide Kojima
  • Publication number: 20230367084
    Abstract: The present disclosure provides an optical control element having an optical waveguide formed of an electro-optic material, and methods of use thereof.
    Type: Application
    Filed: August 20, 2021
    Publication date: November 16, 2023
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Akira OTOMO, Kouichi TANAKA, Toshiki YAMADA, Chiyumi YAMADA, Shun KAMADA, Rieko UEDA
  • Patent number: 11816444
    Abstract: Provided are a model training method for neural machine translation that enhances an encoder using a monolingual corpus of a target language and improves the accuracy of the entire translator, and a machine translation system for performing the model training method. The machine translation system 1000 uses a monolingual corpus of the target language to obtain multiple pieces of pseudo source language data, thus allowing for obtaining a large amount of pseudo parallel corpus data having diversity. Further, the machine translation system 1000 uses both the pseudo parallel corpus data having diversity, which has been obtained in large quantities, and the base parallel corpus data in a small quantity but with high accuracy, with the applied learning rates changed accordingly, to perform the learning process (training process) for the machine translation model. This allows the machine translation system 1000 to obtain a learned model (machine translation model) with very high accuracy.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: November 14, 2023
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Kenji Imamura, Atsushi Fujita, Eiichiro Sumita
  • Publication number: 20230333300
    Abstract: An AR optical element having high image quality, high efficiency of light utilization, and small-size is provided. The AR optical element has periodic structures of refractive index multiplexed with a predetermined interval and predetermined multiplicity, wherein each of the periodic structures of refractive index has an optical normal in a different direction from a physical normal orthogonal to a plane of a micro-region that reflects incident light.
    Type: Application
    Filed: September 16, 2021
    Publication date: October 19, 2023
    Applicant: National Institute of Information and Communications Technology
    Inventors: Koki WAKUNAMI, Yasuyuki ICHIHASHI, Shunsuke YOSHIDA
  • Publication number: 20230330955
    Abstract: A method of producing a nonlinear optical device is provided. In a surface of a semiconductor substrate, a recessed part is formed. In an environment under reduced pressure, the first liquid material is filled into the recessed part. A second liquid material is brought into contact with a first liquid material filled in the recessed part, and thereby a third liquid material is prepared. The third liquid material is solidified, and thereby an embedded portion is formed. The first liquid material includes a first solute and a first solvent, or the first liquid material consists of the first solvent. The second liquid material includes a second solute and a second solvent. The second solute includes a nonlinear optical polymer. The concentration of the second solute in the second liquid material is higher than the concentration of the first solute in the first liquid material.
    Type: Application
    Filed: July 14, 2021
    Publication date: October 19, 2023
    Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Hidehisa TAZAWA, Yasunori MURAKAMI, Akira OTOMO, Toshiki YAMADA, Hideo YOKOHAMA, Rieko UEDA
  • Patent number: 11791905
    Abstract: A system for estimating an imbalance between electrical-optical responses of an in-phase (I) channel and a quadrature (Q) channel in an optical amplitude and phase modulator (optical IQ modulator) includes an optical detector (PD), an analog-digital converter (ADC), and an imbalance operation unit that estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator, wherein the imbalance operation unit includes an input signal information receiving unit that receives information regarding a first modulation signal, and an intensity information receiving unit that receives intensity information of the digitalized output signal from the ADC, and the imbalance operation unit estimates an imbalance between electrical-optical responses of an I channel and a Q channel in the optical IQ modulator using information regarding a first modulation signal and intensity information of the digitalized output signal.
    Type: Grant
    Filed: March 5, 2021
    Date of Patent: October 17, 2023
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Yuki Yoshida, Naokatsu Yamamoto
  • Patent number: 11779278
    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: Grant
    Filed: February 9, 2018
    Date of Patent: October 10, 2023
    Assignees: 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: 20230319746
    Abstract: A time synchronization network able to efficiently maintain time synchronization according to standard time is described. A communication device includes a time information output unit and a time synchronization unit. The time information output unit is configured to output time information with an internal clock that is stable. The time synchronization unit is configured to correct the time information of the time information output unit based on information on a time difference between the communication device and another communication device adjacent to the communication device.
    Type: Application
    Filed: June 29, 2021
    Publication date: October 5, 2023
    Applicant: National Institute of Information and Communications Technology
    Inventors: Motoaki HARA, Yuichiro YANO, Tetsuya IDO
  • Patent number: 11774288
    Abstract: An interference imaging device includes a light interference generator that includes: a light wave splitter configured to reflect a part of incident light and to allow a remaining part of the incident light to pass through; a phase modulator configured to modulate a phase of incident light that has passed through the light wave splitter; and a reflector configured to reflect the phase-modulated incident light from the phase modulator so that the reflected, phase-modulated incident light overlaps with incident light that has been reflected by the light wave splitter.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: October 3, 2023
    Assignee: National Institute of Information and Communications Technology
    Inventor: Tatsuki Tahara
  • Publication number: 20230281922
    Abstract: An optical aberration correction program causing a computer (3) to execute: obtaining phases of a plurality of provisional optical transfer functions of an optical system (10) corresponding to a plurality of provisional optical aberration amounts of the optical system; generating a plurality of three-dimensional phase-modulated images by deconvolving a three-dimensional original image of a sample (12) including an optical aberration of the optical system (10) with each of the phases of the plurality of provisional optical transfer functions; obtaining an optimal theoretical three-dimensional point spread function based on indices of luminance values of the plurality of three-dimensional phase-modulated images; and calculating a three-dimensional correction image by deconvolving the three-dimensional original image or another three-dimensional original image that includes the optical aberration of the optical system (10) and is different from the three-dimensional original image with an optimal optical transfe
    Type: Application
    Filed: July 13, 2021
    Publication date: September 7, 2023
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventor: Atsushi MATSUDA
  • Patent number: 11750204
    Abstract: This atomic resonator for causing a resonance frequency by CPT resonance includes: a gas cell having alkali metal atoms enclosed; a photodetector configured to detect light having passed through the gas cell and convert the light to an electric signal; a high-frequency oscillator configured to receive the electric signal and output the signal after a frequency thereof is divided by two; and a laser light source configured to modulate and introduce, into the gas cell, light based on the signal output from the high-frequency oscillator. The high-frequency oscillator has an injection-locked frequency divider circuit including an acoustic resonator as an oscillation element.
    Type: Grant
    Filed: March 11, 2022
    Date of Patent: September 5, 2023
    Assignees: National Institute of Information and Communications Technology, Tokyo Institute of Technology
    Inventors: Motoaki Hara, Yuichiro Yano, Masatoshi Kajita, Tetsuya Ido, Hiroyuki Ito
  • Patent number: 11722206
    Abstract: A wireless communication method collects data generated from a plurality of moving entities. The wireless communication method includes performing first communication in which a control device controls a condition of data forwarding in the plurality of moving entities, via long-distance wireless communication; performing second communication that includes carrying out communication between one of the moving entities and a relay, or communication among the plurality of moving entities, via short-distance wireless communication, by using a DTN (Delay Tolerant Network), which employs a store-carry-and-forward process; and performing third communication that includes carrying out communication between the control device and the relay, or communication between the control device and one of the moving entities, via wired communication or the long-distance wireless communication.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: August 8, 2023
    Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Yuuichi Teranishi, Takashi Kimata, Eiji Kawai, Hiroaki Harai
  • Publication number: 20230195161
    Abstract: It is provided a synchronization system capable of managing execution of synchronization for clocks to be mounted on various devices. A synchronization system of clocks comprising: a leader device; a follower device capable of establishing communication connection with the leader device; and a server apparatus capable of establishing communication connection with the leader device and/or the follower device, the system further comprising: a time deviation calculator configured to calculate a time deviation between the leader device and the follower device; and a time corrector configured to correct a time in the follower device based on the calculated time deviation, wherein the synchronization system executes the time deviation calculator and/or the time corrector when the server apparatus generates, transmits, and/or receives predetermined information.
    Type: Application
    Filed: April 14, 2021
    Publication date: June 22, 2023
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Nobuyasu SHIGA, Satoshi YASUDA
  • Publication number: 20230171726
    Abstract: In performing wireless communication between terminals to perform time difference measurement and propagation time measurement, first and second terminals that transmit a signal at least once in attempting space-time synchronization are included. The first terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the second terminal, adds a positive or negative phase to the measured reception phase, and makes a report to the second terminal. The second terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the first terminal, and makes a report to the first terminal. The first and second terminals obtain a time difference or propagation time according to a reception phase measured by a local device and reported from a counterpart, and obtain additional information based on a phase reflected in the time difference or propagation time.
    Type: Application
    Filed: November 29, 2021
    Publication date: June 1, 2023
    Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Maki YOSHIDA, Nobuyasu SHIGA, Satoshi YASUDA, Kenichi TAKIZAWA
  • Patent number: 11656122
    Abstract: A photon detection device according to an aspect of the present invention includes: a superconducting photon detector array in which a plurality of superconducting photon detectors (SPDs) are arranged; a plurality of first transmission lines connected to the plurality of SPDs and configured to transmit a detection current output from each of the plurality of SPDs; an address information generation circuit connected to the plurality of first transmission lines and configured to generate, based on the detection current, an address information signal that specifies a superconducting photon detector from which the detection current is output; a second transmission line magnetically coupled to all of the plurality of first transmission lines; and a time information generation circuit connected to the second transmission line and configured to generate, based on the detection current, a time information signal indicating a time at which a photon is incident on the plurality of superconductive photon detection SPDs.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: May 23, 2023
    Assignees: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
    Inventors: Naoki Takeuchi, Shigehito Miki, Hirotaka Terai