Patents Assigned to National Institute of Information and Communications Technology
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Patent number: 11774288Abstract: 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: GrantFiled: September 30, 2020Date of Patent: October 3, 2023Assignee: National Institute of Information and Communications TechnologyInventor: Tatsuki Tahara
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Publication number: 20230281922Abstract: 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 transfeType: ApplicationFiled: July 13, 2021Publication date: September 7, 2023Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventor: Atsushi MATSUDA
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Patent number: 11750204Abstract: 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: GrantFiled: March 11, 2022Date of Patent: September 5, 2023Assignees: National Institute of Information and Communications Technology, Tokyo Institute of TechnologyInventors: Motoaki Hara, Yuichiro Yano, Masatoshi Kajita, Tetsuya Ido, Hiroyuki Ito
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Patent number: 11722206Abstract: 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: GrantFiled: December 13, 2019Date of Patent: August 8, 2023Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Yuuichi Teranishi, Takashi Kimata, Eiji Kawai, Hiroaki Harai
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Publication number: 20230195161Abstract: 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: ApplicationFiled: April 14, 2021Publication date: June 22, 2023Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Nobuyasu SHIGA, Satoshi YASUDA
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Publication number: 20230171726Abstract: 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: ApplicationFiled: November 29, 2021Publication date: June 1, 2023Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Maki YOSHIDA, Nobuyasu SHIGA, Satoshi YASUDA, Kenichi TAKIZAWA
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Patent number: 11656122Abstract: 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: GrantFiled: February 26, 2020Date of Patent: May 23, 2023Assignees: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Naoki Takeuchi, Shigehito Miki, Hirotaka Terai
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Publication number: 20230120581Abstract: 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: ApplicationFiled: March 5, 2021Publication date: April 20, 2023Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Yuki YOSHIDA, Naokatsu YAMAMOTO
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Publication number: 20230022825Abstract: A secret key sharing system includes a transceiver in a first layer, a plurality of transceivers in a second layer, and a plurality of transceivers in a third layer. The transceivers in the second layer receive a first random number from the transceiver in the first layer via a directional carrier wave. The transceivers in the third layer receive a second random number from one of the transceivers in the second layer via the carrier wave. The transceiver in the first layer and the transceivers in the second layer share a first secret key based on the first random number, and the one of the transceivers in the second layer and the plurality of transceivers in the third layer share a second secret key based on the second random number.Type: ApplicationFiled: January 22, 2021Publication date: January 26, 2023Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Hiroyuki ENDO, Masahide SASAKI
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Patent number: 11563092Abstract: 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: GrantFiled: April 26, 2018Date of Patent: January 24, 2023Assignees: National Institute of Information and Communications Technology, Tamura Corporation, Novel Crystal Technology, IncInventors: Masataka Higashiwaki, Yoshiaki Nakata, Takafumi Kamimura, Man Hoi Wong, Kohei Sasaki, Daiki Wakimoto
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Publication number: 20230012453Abstract: Provided is a variable-wavelength surface emission laser having a wide wavelength variation range. A partial region of a thin-plate substrate (22) and a movable mirror (20), the partial region being positioned between an air gap (G1) and a movable gap (G2), can move toward the air gap (G1) side or the movable gap (G2) side.Type: ApplicationFiled: December 8, 2020Publication date: January 12, 2023Applicant: National Institute of Information and Communications TechnologyInventors: Motoaki HARA, Yuichiro YANO, Masatoshi KAJITA, Tetsuya IDO, Satoshi SHINADA, Takahito ONO, Masaya TODA
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Patent number: 11502831Abstract: A quantum key distribution device is provided with an encoding unit which encodes an optical pulse train; an intensity modulating unit which subjects the encoded optical pulse train to N (where N is an integer at least equal to 3) types of intensity modulation having mutually different intensities, with different timings; and a first key distillation processing unit which generates an encryption key on the basis of a data sequence obtained by removing data obtained from an optical pulse having a specific modulation pattern from a data sequence used by the encoding unit and the intensity modulating unit.Type: GrantFiled: August 31, 2017Date of Patent: November 15, 2022Assignees: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, National University Corporation Hokkaido UniversityInventors: Ken-ichiro Yoshino, Mikio Fujiwara, Masahide Sasaki, Akihisa Tomita
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Publication number: 20220349755Abstract: 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: ApplicationFiled: September 30, 2020Publication date: November 3, 2022Applicant: National Institute of Information and Communications TechnologyInventor: Tatsuki TAHARA
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Patent number: 11429197Abstract: A Latin character conversion apparatus includes a code associator that associates each of a plurality of character keys assigned with Latin characters among a plurality of keys included in a keyboard with any of a plurality of character codes established by a character encoding scheme of the Unicode Standard, a character associator that associates the character code with a relevant code being another character code, a code converter that, in response to an instruction by a user that instructs any of the plurality of character keys, determines the character code associated with the instructed character key as a conversion candidate, and a character converter that, in response to an instruction by the user that instructs the character key serving also as a conversion key of the plurality of character keys with the conversion candidate determined, converts the conversion candidate into the relevant code associated with the conversion candidate.Type: GrantFiled: February 4, 2020Date of Patent: August 30, 2022Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Chenchen Ding, Masao Uchiyama
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Patent number: 11405072Abstract: A communication method includes generating at a first node, a message of a predetermined message temporal length that indicates an input value to be encoded and transmitting, at the first node, a signal including a pulse train corresponding to the generated message. The signal including the pulse train includes two pulses that define start and end of the message, respectively, and further two pulses that define within the message, a first time interval calculated from the input value in accordance with a first function and a second time interval calculated from the input value in accordance with a second function, respectively.Type: GrantFiled: July 16, 2019Date of Patent: August 2, 2022Assignees: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, TOKYO UNIVERSITY OF SCIENCE FOUNDATIONInventors: Ferdinand Peper, Kenji Leibnitz, Tetsuya Shimokawa, Mikio Hasegawa, Kaori Kuroda
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Publication number: 20220237380Abstract: Improvement is made in performance of a trained neural network that uses positional information indicating a position at which each token included in an input sequence is present in the input sequence.Type: ApplicationFiled: July 6, 2020Publication date: July 28, 2022Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Kehai CHEN, Rui WANG, Masao UCHIYAMA, Eiichiro SUMITA
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Publication number: 20220200612Abstract: 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: ApplicationFiled: March 11, 2022Publication date: June 23, 2022Applicants: National Institute of Information and Communications Technology, Tokyo Institute of TechnologyInventors: Motoaki HARA, Yuichiro YANO, Masatoshi KAJITA, Tetsuya IDO, Hiroyuki ITO
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Patent number: 11368938Abstract: To provide a wireless communication system that can implement optimal communication conditions depending on the type of data. A wireless communication system 100 for transmitting and receiving data to and from a plurality of terminals 2 for use in a narrow space includes normal transmitting/receiving means for transmitting and receiving normal data, among the data, to and from a terminal 2, based on priorities assigned to each of a plurality of buffers stored in a base station 1, and urgent transmitting/receiving means for assigning a high priority to a buffer storing a lowest amount of data among the plurality of buffers, and transmitting and receiving urgent data, among the data, which is different from the normal data, to and from the terminal, via the buffer to which the high priority is assigned.Type: GrantFiled: March 17, 2020Date of Patent: June 21, 2022Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Satoko Itaya, Kenichi Maruhashi, Fumiko Ohori, Fumihide Kojima
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Publication number: 20220164037Abstract: A Latin character conversion apparatus includes a code associator that associates each of a plurality of character keys assigned with Latin characters among a plurality of keys included in a keyboard with any of a plurality of character codes established by a character encoding scheme of the Unicode Standard, a character associator that associates the character code with a relevant code being another character code, a code converter that, in response to an instruction by a user that instructs any of the plurality of character keys, determines the character code associated with the instructed character key as a conversion candidate, and a character converter that, in response to an instruction by the user that instructs the character key serving also as a conversion key of the plurality of character keys with the conversion candidate determined, converts the conversion candidate into the relevant code associated with the conversion candidate.Type: ApplicationFiled: February 4, 2020Publication date: May 26, 2022Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Chenchen Ding, Masao Uchiyama
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Publication number: 20220147640Abstract: A secret sharing storage system includes at least one user terminal, n units (n: an integer of 2 or more) of storage devices, and a main controller that is communicably connected to a random number generator. The main controller acquires a random number generated by the random number generator in a case of receiving original data sent from the user terminal, executes distributed processing on the original data by using the random number to generate n pieces of distributed data, and stores the n pieces of distributed data respectively in the corresponding n units of storage devices.Type: ApplicationFiled: January 21, 2020Publication date: May 12, 2022Applicants: PANASONIC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Masakatsu MATSUO, Katsunori KOGATA, Masahide SASAKI, Mikio FUJIWARA