Patents by Inventor Masahide Sasaki
Masahide Sasaki 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).
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Publication number: 20240150530Abstract: To provide a resin composition, from which a molded body excellent in mechanical properties and having high elasticity, can be obtained, and the molded body obtained from such a resin composition. A resin composition comprising a melt-moldable fluororesin and inorganic fibers, wherein the ratio of the fluororesin to the sum of the fluororesin and the inorganic fibers is from 60 to 95 mass %, the inorganic fibers are inorganic fibers, of which at least a portion of the surface is treated with a sizing agent, and the mass loss ratio after heating the inorganic fibers at 400° C. for 60 minutes, is at most 3%; a method for producing the resin composition; and a molded body formed from the resin composition.Type: ApplicationFiled: January 4, 2024Publication date: May 9, 2024Applicant: AGC Inc.Inventors: Norio OZAWA, Toru SASAKI, Masahide YODOGAWA
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Publication number: 20240093029Abstract: To provide a poiyamide type composition excellent in impact resistance. A composition comprising a polyamide and a fluorinated polymer, wherein the fluorinated polymer has a glass transition temperature of less than 30° C. and has no melting point, and the fluorinated polymer is dispersed in the polyarnide, and the average dispersed particle diameter of the fluorinated polymer is less than 12 ?m.Type: ApplicationFiled: November 29, 2023Publication date: March 21, 2024Applicant: AGC Inc.Inventors: Masatoshi ABE, Toru SASAKI, Eiichi NISHI, Masahide YODOGAWA
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Publication number: 20240089093Abstract: An object is to prevent eavesdropping in quantum key distribution. A decoding unit decodes a quantum signal incident thereinto. A plurality of detect photons of the decoded quantum signal output from the decoding unit. A signal processing unit detects bits of the decoded quantum signal based on photon detection results of the plurality of detectors. A control unit perform switching processing by switching destinations to which two decoded quantum signals corresponding to one encoding basis are output between the plurality of detectors, and switching the bits detected by the signal processing unit based on the respective photon detection results of the plurality of detectors.Type: ApplicationFiled: January 24, 2022Publication date: March 14, 2024Applicants: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, THE UNIVERSITY OF TOKYOInventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Akihisa TOMITA, Masato KOASHI, Masahiro TAKEOKA, Masahide SASAKI
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Publication number: 20240080184Abstract: An object is to prevent eavesdropping in quantum key distribution. A photon detector outputs an output current indicating a result of detecting a quantum signal. A current-voltage conversion unit converts the output current into an output voltage signal. An analog-to-digital converter outputs an output voltage signal obtained by analog-digital conversion of the output voltage signal. A signal processing unit performs predetermined signal processing on the output voltage signal, and outputs a photon detection signal indicating a result of detecting the quantum signal. When a time difference between a timing at which the quantum signal is incident into the photon detector and a reference timing determined based on a clock signal is not within a determination range, the photon detection signal is not output from the signal processing unit.Type: ApplicationFiled: January 24, 2022Publication date: March 7, 2024Applicants: NEC Corporation, National Institute of Information and Communications Technology, NATIONAL UNIVERSTIY CORPORATION HOKKAIDO UNIVERSTIY, The University of TokyoInventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Akihisa TOMITA, Masato KOASHI, Masahiro TAKEOKA, Masahide SASAKI
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Publication number: 20240067795Abstract: To provide resin compositions excellent in electrical conductivity and flexibility. A resin composition comprising a fluororesin and a carbon nanostructure, wherein the carbon nanostructure includes a plurality of carbon nanotubes that are branched and share a common wall with each other.Type: ApplicationFiled: November 3, 2023Publication date: February 29, 2024Applicant: AGC Inc.Inventors: Masatoshi ABE, Toru SASAKI, Masahide YODOGAWA
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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: 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: 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
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Publication number: 20190245685Abstract: 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: ApplicationFiled: August 31, 2017Publication date: August 8, 2019Applicants: NEC CORPORATION, NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATION UNIVERSITY, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Ken-ichiro YOSHINO, Mikio FUJIWARA, Masahide SASAKI, Akihisa TOMITA
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Patent number: 10193874Abstract: Provided is a communication system in which a terminal communicates with a server via a portable communication network used for communication between smartphones. The smart phone includes first pre-shared key and encryption keys, the terminal includes a second pre-shared key, the server includes the encryption keys same as the encryption keys included in the smartphone, authentication between the terminal and the smartphone is performed by using the first pre-shared key and the second pre-shared key, and the terminal and the server perform communication via the smartphone by performing key synchronization of the encryption keys while setting a hash value of the encryption keys as an ID.Type: GrantFiled: November 9, 2016Date of Patent: January 29, 2019Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGYInventors: Mikio Fujiwara, Masahide Sasaki
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Publication number: 20170134351Abstract: Provided is a communication system in which a terminal communicates with a server via a portable communication network used for communication between smartphones. The smart phone includes first pre-shared key and encryption keys, the terminal includes a second pre-shared key, the server includes the encryption keys same as the encryption keys included in the smartphone, authentication between the terminal and the smartphone is performed by using the first pre-shared key and the second pre-shared key, and the terminal and the server perform communication via the smartphone by performing key synchronization of the encryption keys while setting a hash value of the encryption keys as an ID.Type: ApplicationFiled: November 9, 2016Publication date: May 11, 2017Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIO NS TECHNOLOGYInventors: Mikio FUJIWARA, Masahide SASAKI
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Patent number: 8509446Abstract: It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.Type: GrantFiled: December 28, 2010Date of Patent: August 13, 2013Assignees: National Institute of Information and Communications Technology, NEC CorporationInventors: Mikio Fujiwara, Morio Toyoshima, Masahide Sasaki, Akihisa Tomita, Yoshihiro Nambu, Ken-ichiro Yoshino
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Patent number: 8048731Abstract: A method for reducing low frequency noise of a transistor operable at cryogenic temperatures includes a first step in which the transistor is illuminated with a light in a state that the transistor is activated and flowed current by supplying a power at a predetermined temperature, and a second step in which the transistor is operated at the predetermined temperature after the illumination of the light.Type: GrantFiled: March 18, 2009Date of Patent: November 1, 2011Assignees: National Institute of Information and Communications Technology, National Institutes of Natural SciencesInventors: Mikio Fujiwara, Masahide Sasaki, Hiroshi Matsuo, Hirohisa Nagata
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Publication number: 20110170695Abstract: It is an object of the present invention to provide a network system for quantum key distribution (QKD) for free space and fiber networks. The system of the present invention generates a couple of photons which have different wavelength and inputs each of the photons into the asymmetric Mach-Zehnder interferometer to obtain time-bin entangled state. It provides polarization information with one part of the photons. Then it can obtain hybrid quantum entanglement. The system of the present invention may be used hybrid quantum key distribution system applied for both free space and fibers.Type: ApplicationFiled: December 28, 2010Publication date: July 14, 2011Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, NEC CORPORATIONInventors: Mikio FUJIWARA, Morio TOYOSHIMA, Masahide SASAKI, Akihisa TOMITA, Yoshihiro NAMBU, Ken-ichiro YOSHINO
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Publication number: 20100237934Abstract: A method for reducing low frequency noise of a transistor operable at cryogenic temperatures includes a first step in which the transistor is illuminated with a light in a state that the transistor is activated and flowed current by supplying a power at a predetermined temperature, and a second step in which the transistor is operated at the predetermined temperature after the illumination of the light.Type: ApplicationFiled: March 18, 2009Publication date: September 23, 2010Inventors: Mikio Fujiwara, Masahide Sasaki, Hiroshi Matsuo, Hirohisa Nagata
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Patent number: 7403713Abstract: Quantum source coding apparatus for communication of quantum information comprising: a quantum state preparation device for converting input messages into block messages; a coding device for producing coded signals by compressing the block messages prepared by the quantum state preparation device; and an output device for outputting the coded signals produced by the coding device.Type: GrantFiled: March 4, 2004Date of Patent: July 22, 2008Assignees: University of Hertfordshire, National Institute of Information and Communications Technology, University of StrathelydeInventors: Masahide Sasaki, Yasuyoshi Mitsumori, Atsushi Hasegawa, Masahiro Takeoka, John A. Vaccaro, Stephen M. Barnett, Erika Andersson
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Patent number: 7176439Abstract: This invention provides a method for manufacturing a circuit for photon number counting without destroying a FET within the circuit by manufacturing a photodetector for weak light, the photodetector for weak light comprising a circuit on a substrate, the circuit comprising light detection means and a field effect transistor (FET), the method comprising: a light detection means connection step; an FET electrode-to-substrate electrode connection step; an external electrode connection step, a light detection means-to-gate connection step.Type: GrantFiled: July 6, 2004Date of Patent: February 13, 2007Assignee: National Institute of Information and Communication TechnologyInventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba
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Patent number: 7115868Abstract: The present invention provides a photodetector for weak light that can prevent noise from impurities, prevent electrodes from disconnecting from the substrate, and can be easily cooled; the present invention further provides a photodetector for weak light that can count the number of photons; the present invention solves the above problems by using an ultraviolet light transparent substrate on the photodetector for weak light.Type: GrantFiled: July 6, 2004Date of Patent: October 3, 2006Assignee: National Institute of Information and Communications Technology Incorporated Administrative AgencyInventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba
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Patent number: 7078667Abstract: This invention provides a photodetector for weak light and a weak light detection system including the photodetector for weak light the photodetector for weak light is comprised of a substrate on which an integrating read circuit including a PIN photodiode or an APD and an FET is mounted, wherein the entire assembly is mounted while separating the substrate from a ground potential without grounding the substrate, such a photodetector for weak light can reduce noise and ensure a high enough sensitivity enough to be able to discriminate the number of photons.Type: GrantFiled: July 6, 2004Date of Patent: July 18, 2006Assignee: National Institute of Information and Communications Technology Incorporated Administrative AgencyInventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba
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Patent number: 7067790Abstract: The present invention provides a photodetector for weak light that can release charge from the circuit without increasing capacity; the present invention being characterized by a photodetector for weak light that has a charge release means which permits the photodetector for weak light of the present invention to avoid increasing its capacity because it does not require a reset transistor integrated with the photodector, rather the charge reset means of the present invention lowers mounting capacity by removing itself from the circuit after it releases the charge.Type: GrantFiled: July 6, 2004Date of Patent: June 27, 2006Assignee: National Institute of Information and Communications Technology Incorporated Administrative AgencyInventors: Mikio Fujiwara, Masahide Sasaki, Makoto Akiba