Patents Assigned to Nippon Telegraph and Telephone Corporation
  • Patent number: 11454607
    Abstract: A crack detection device includes: a sensor unit that has a three-layer structure of conductor-insulator-conductor and is attached to a structure; a frequency characteristics acquisition unit that sweeps a predetermined frequency range to acquire a plurality of frequencies at which the impedance of the sensor unit is maximum or minimum; a crack presence/absence determination unit that determines the presence or absence of a crack based on a nonuniformity of the plurality of frequencies; a crack position table in which a relationship between crack positions and frequency shift directions is recorded; and a crack position detection unit that, when the crack presence/absence determination unit determines that there is a crack, takes a difference between two frequencies acquired by the frequency characteristics acquisition unit to determine a sign, and then refers to the crack position table in accordance with the sign to detect a crack position.
    Type: Grant
    Filed: November 1, 2019
    Date of Patent: September 27, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tadashi Minotani, Eri Matsunaga, Masahito Nakamura, Masayuki Tsuda
  • Patent number: 11456862
    Abstract: Pi and P+ have stored a+?{a0, a1, a2} and b+?{b0, b1, b2} therein, and Pi and P? have stored a??A? and b??B? therein. Here, P+?P(i+1)mod 3, P?=P(i?1)mod 3, and a and b are arbitrary values and satisfy a=a0+a1+a2 and b=b0+b1+b2, where A? is a complement of a+ in {a0, a1, a2} and B? is a complement of b+ in {b0, b1, b2}. Pi and P+ share r+, Pi and P? share r?, and Pi calculates c+=(a++a?)(b++b?)?a?b?+r+?r?. Pi sends c+ to P+.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: September 27, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Dai Ikarashi, Koji Chida, Ryo Kikuchi
  • Patent number: 11456498
    Abstract: Provided is a rechargeable lithium-air battery that improves charge-discharge energy efficiency and has good charge-discharge cycle performance. The rechargeable lithium-air battery includes: an air electrode including carbon; a negative electrode including metallic lithium or a lithium-containing substance; and an electrolyte in contact with the air electrode and the negative electrode. The electrolyte includes a salen-based metal complex and a quinone. The quinone includes any one or more of anthraquinone, 2,5-dihydroxy-1,4-benzoquinone, 7,7,8,8-tetracyanodimethane, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, tetrahydroxy-1,4-benzoquinone, and 2,5-di-tert-butyl-1,4-benzoquinone.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: September 27, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shuhei Sakamoto, Masahiko Hayashi, Masaya Nohara, Mikayo Iwata, Takeshi Komatsu
  • Patent number: 11454757
    Abstract: A planar waveguide having M×N number of cores and to which M number of fibers having N number of cores are connected. In the planar waveguide, in a connecting end surface of the planar waveguide to which the fibers are connected, P number of fibers having Q number of cores are connected, M×N is equal to P×Q, the planar waveguide includes a plurality of the cores arranged in a horizontal direction at the same height position in the planar waveguide, and a laminated structure having the cores at different positions in a height direction, so as to be aligned with the cores of the fibers connected to the connecting end surface, and the positions of the M×N number of cores are constant in the height direction, and change only in the horizontal direction.
    Type: Grant
    Filed: July 11, 2019
    Date of Patent: September 27, 2022
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Taiji Sakamoto, Yoshiteru Abe, Kazuhide Nakajima
  • Patent number: 11456003
    Abstract: An estimation device includes a memory, and processing circuitry coupled to the memory and configured to receive an input of an input audio signal that is an audio signal in which sounds from a plurality of sound sources are mixed, and an input of supplemental information, and output an estimation result of mask information that identifies a mask for extracting a sound of any one of the sound sources included in an entire or a part of a signal included in the input audio signal, the signal being identified by the supplemental information, cause a neural network to iterate a process of outputting the estimation result of the mask information, and cause the neural network to output an estimation result of the mask information for a different sound source, by inputting a different piece of the supplemental information to the neural network at each iteration.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: September 27, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Keisuke Kinoshita, Marc Delcroix, Tomohiro Nakatani, Shoko Araki, Lukas Drude, Thilo Christoph Von Neumann
  • Publication number: 20220303004
    Abstract: According to the present disclosure, a wireless base station device delivers, to a wireless terminal device, an optical ID having a simple configuration in accordance with a pre-stored optical ID correspondence list; and the wireless terminal device selects connection authentication information corresponding to the received optical ID from a pre-stored optical ID correspondence list, and transmits predetermined authentication information to the wireless base station device through a predetermined connection method by RF wireless. Upon confirming that the received authentication information matches authentication information corresponding to an optical ID in the optical ID correspondence list, the wireless base station device permits information communication between the wireless terminal device and a higher-level network.
    Type: Application
    Filed: August 7, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomohiro TANIGUCHI, Shinya TAMAKI, Ryota SHIINA, Kazutaka HARA, Tomoki MURAKAMI, Toshiro NAKAHIRA
  • Publication number: 20220301570
    Abstract: A sound source separation filter information estimation device (10) estimates a covariance matrix having information on a correlation between sound source spectra and information on a correlation between channels as information on sound source separation filter information for separating an individual sound source signal from a mixed acoustic signal.
    Type: Application
    Filed: August 21, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Rintaro IKESHITA, Nobutaka ITO, Tomohiro NAKATANI, Hiroshi SAWADA
  • Publication number: 20220303938
    Abstract: A wireless terminal station device, a plurality of wireless base station devices, and a positioning request device are included, the wireless terminal station device makes a positioning request including identification information of its own device to the positioning request device via the wireless base station device to which the wireless terminal station device belongs among the plurality of wireless base station devices, the positioning request device receives the positioning request from the wireless terminal station device, specifies the wireless base station device to which the wireless terminal station device belongs on the basis of the identification information of the wireless terminal station device, transmits a positioning instruction and the identification information of the wireless terminal station device to the specified wireless base station device, and receives a result of positioning of the wireless terminal station device from the wireless base station device, and the wireless base station
    Type: Application
    Filed: June 17, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masamichi HOSODA, Maiko NAYA, Akira NAKAYAMA, Masaru MIYAMOTO
  • Publication number: 20220303124
    Abstract: A key exchange system in which a shared key is generated for executing encrypted communication between communication apparatuses according to an authenticated key exchange protocol using ID-based encryption, wherein each communication apparatus includes a memory and a processor configured to generate a short-term private key by using a private key of the communication apparatus; generate a short-term public key of the communication apparatus by using the short-term private key; generate private information on the communication apparatus by using the short-term private key, a short-term public key generated by another communication apparatus, and public information generated by the communication apparatus and said another communication apparatus or public information generated by a key delivering center; and generate the shared key for executing encrypted communication with said another communication apparatus by executing a pairing operation using the private key of the communication apparatus and the private
    Type: Application
    Filed: July 16, 2020
    Publication date: September 22, 2022
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NATIONAL UNIVERSITY CORPORATION TOYOHASHI UNIVERSITY OF TECHNOLOGY
    Inventors: Junichi TOMIDA, Fumitaka HOSHINO, Akira NAGAI, Atsushi FUJIOKA, Koutarou SUZUKI
  • Publication number: 20220303645
    Abstract: An object of the present disclosure is to propose a technique to enumerate intermediate configurations at high speeds. A configuration enumeration device 10 according to the present disclosure enumerates a network configuration in an input layer 21, an intermediate layer 22, and an output layer 23 that minimizes the number of mechanical patch panels provided in mechanical patch panels, by using a-quasi-nonblocking configurations, where a being 0 indicates a rearrangeably nonblocking configuration and ? being 1 indicates a strictly nonblocking configuration, for 0???1, when a minimum value C of wiring capacity of mechanical patch panels having the input layer 21, the intermediate layer 22, and the output layer 23 is obtained.
    Type: Application
    Filed: September 25, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toru MANO, Takeru INOUE
  • Publication number: 20220302974
    Abstract: In a wireless communication system for performing single-carrier MIMO transmission, a transmitting station apparatus includes a training signal generation unit and a transmit beamforming unit that performs transmit beamforming processing using transmit weights and a receiving station apparatus includes a communication path estimation unit, an interference amount determination unit that determines whether or not a residual inter-stream interference exceeds a predetermined threshold value, a receive weight calculation unit that calculates a receive weight used for receive beamforming processing when the residual inter-stream interference exceeds the threshold value, and a receive beamforming unit that performs receive beamforming processing for suppressing residual inter-stream interferences using the receive weight.
    Type: Application
    Filed: August 20, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Keita KURIYAMA, Hayato FUKUZONO, Masafumi YOSHIOKA, Tsutomu TATSUTA
  • Publication number: 20220301575
    Abstract: A direction-of-arrival estimation device for achieving direction-of-arrival estimation which is robust against an SNR and in which an application range of a learning model is specific is provided.
    Type: Application
    Filed: February 4, 2020
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masahiro YASUDA, Yuma KOIZUMI
  • Publication number: 20220296935
    Abstract: An aspect of the present disclosure is a G-tolerance improving device including a valve control unit configured to control an operation of a main system valve configured to control pressure of oxygen to be supplied to a user who is breathing with positive pressure applied to his or her airway, the oxygen from a main supply source configured to supply the oxygen to the user, and an operation of an auxiliary system valve configured to control pressure of an auxiliary gas to be supplied to the user, the auxiliary gas from an auxiliary supply source configured to supply, to the user, the auxiliary gas including highly concentrated oxygen that is oxygen at a higher concentration than the oxygen supplied from the main supply source, in which, when a breathing state of the user changes from an exhalation phase to an inhalation phase, the valve control unit controls an operation of the main system valve and the auxiliary system valve such that the auxiliary gas is supplied to the user for a predetermined time that is
    Type: Application
    Filed: June 4, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shingo TSUKADA, Hiroshi NAKASHIMA, Toichiro GOTO
  • Publication number: 20220299332
    Abstract: An information presentation device includes: a communication unit that receives the degree of congestion at each position on each of a plurality of routes from each of human flow sensors installed at predetermined intervals on each of the plurality of routes to a specific point; a calculation unit that calculates the required time for each time series of the route on the basis of the degree of congestion at each position in each of the routes; a prediction unit that inputs the time-series required time calculated for each of the routes to a predetermined device for predicting The required time of each of the routes learned in advance, and predicts the timing when the required time approaches the threshold for each of the routes as an output of the predetermined device; and an information management unit that identifies a route that requires inducement from the timing predicted for each of the routes, selects an incentive for prompting a change in the identified route and an inducement time for the incentive,
    Type: Application
    Filed: August 8, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Maiko NAYA, Masamichi HOSODA, Akira NAKAYAMA, Masaru MIYAMOTO
  • Publication number: 20220299401
    Abstract: An object of the present invention is to provide an optical fiber test method, an optical fiber test apparatus, and a program, capable of detecting a boundary of an optical fiber line facility regardless of a change in a noise amount. A change amount (a differential value) of an OTDR waveform increases toward a distal end due to noise effects, making it difficult to determine a boundary of the optical fiber using the change amount. Therefore, in the present invention, a dispersion of the OTDR waveform, which increases toward a distal end due to noise effects, is also used to determine the boundary of the optical fiber. In other words, in the present invention, the noise amount is expressed by the dispersion, and the dispersion is compared with the change amount such as a differential value as a threshold, to determine the boundary of the optical fiber.
    Type: Application
    Filed: August 23, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Nazuki HONDA, Kazutaka NOTO, Hiroyuki OSHIDA
  • Publication number: 20220301580
    Abstract: A learning apparatus includes: a storage unit that stores at least a learning-purpose expression indicating a psychological state and an emotion, and learning-purpose feeling information indicating a feeling at the time of issuance of the learning-purpose expression indicating the psychological state and the emotion; and a learning unit that learns an estimation model, using a plurality of pieces of learning data, one piece of the learning data being a set including at least a chronological series of two or more expressions indicating psychological states and. emotions up to time (t) and learning-purpose feeling information indicating a feeling after the time (t), the estimation model estimating a feeling after a certain time by using at least a chronological series of two or more expressions indicating psychological states and emotions up to the certain time as an input.
    Type: Application
    Filed: August 6, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Junji WATANABE, Aiko MURATA
  • Publication number: 20220299620
    Abstract: A spatial image generation apparatus includes: a propagation channel information measurer that measures propagation channel information of a target area from radio signals delivered between transmitting and receiving stations; a learned model generator that generates a learned model for generating a spatial image of the target area from the newly input propagation channel information using the propagation channel information and image information obtained by imaging the target area with a camera; and an image generator that generates the spatial image of the target area by inputting the propagation channel information newly input from the propagation channel information measurer to the learned model. The object detection apparatus includes: the spatial image generation apparatus; and an object detector that detects an object in the target area from the spatial image generated by the image generator using an image analysis method.
    Type: Application
    Filed: August 19, 2020
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoki MURAKAMI, Hirantha ABEYSEKERA, Shunsuke SARUWATARI, Takeru FUKUSHIMA, Yusuke IWASAKI, Takashi WATANABE
  • Publication number: 20220301422
    Abstract: An anomaly detection system includes a memory and a processor configured to divide a set of data measured in a geographical space into a plurality of groups that represent a plurality of predetermined geographical subspaces, calculate, for each group, a feature amount in the group using data included in the group, and determine whether or not there is a group that is likely to include abnormal data, among the plurality of groups, using the feature amount in each of the plurality of groups.
    Type: Application
    Filed: September 12, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takafumi HARADA, Keita HASEGAWA, Tomoaki WASHIO, Yoshihito OSHIMA
  • Publication number: 20220303003
    Abstract: A signal processing apparatus includes: a coefficient update unit configured to approximate a characteristic of a transmission line of an optical signal by a first tap coefficient vector of which an LO norm is a predetermined value or less; a zeroing unit configured to generate a second tap coefficient vector by replacing, with 0, a tap coefficient of which an absolute value is less than a threshold among tap coefficients of the first tap coefficient vector; and an adaptive filter configured to perform, based on the second tap coefficient vector, adaptive equalization processing on a digital signal corresponding to an optical signal received via the transmission line.
    Type: Application
    Filed: September 17, 2019
    Publication date: September 22, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kengo HORIKOSHI, Masanori NAKAMURA, Seiji OKAMOTO, Hideki NISHIZAWA, Etsushi YAMAZAKI
  • Patent number: 11447888
    Abstract: Provided is a method for producing a crystal fiber which can suppress the occurrence of stress birefringence even while distributing a light emission center so as to concentrate on a cross-sectional middle portion. The method for producing a crystal fiber comprises the steps of: using, as a preform, the crystal fiber comprising a light emission center that volatilizes from a melted portion upon the melting of a crystal, and heating a portion or a plurality of portions of the side of the preform, whereby the portion or the plurality of portions of the preform are melted such that only a given amount of the inside of the portion or the plurality of portions of the preform is not melted, to form the melted portion; and sequentially transferring the melted portion in the longitudinal direction of the preform, and cooling the melted portion, whereby the melted portion is continuously recrystallized to form a recrystallized region.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: September 20, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Shigeo Ishibashi