Patents Assigned to Nippon Telegraph and Telephone Corporation
  • Patent number: 10382455
    Abstract: A command and control server identifying apparatus provides data received by malware upon execution of the malware with a tag that allows to uniquely identify communication destination information of a source of the data, and tracks propagation of the data provided with the tag. Then, the command and control server identifying apparatus obtains a tag of data referred to by a branch instruction executed by the malware among tracked data. Then, the command and control server identifying apparatus identifies communication destination information of a command and control server that issues a command to the malware, based on communication destination information of a source associated with the obtained tag.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: August 13, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomonori Ikuse, Kazufumi Aoki, Takeo Hariu
  • Patent number: 10381015
    Abstract: A technology of accurately coding and decoding coefficients which are convertible into linear prediction coefficients even for a frame in which the spectrum variation is great while suppressing an increase in the code amount as a whole is provided. A coding device includes: a first coding unit that obtains a first code by coding coefficients which are convertible into linear prediction coefficients of more than one order; and a second coding unit that obtains a second code by coding at least quantization errors of the first coding unit if (A-1) an index Q commensurate with how high the peak-to-valley height of a spectral envelope is, the spectral envelope corresponding to the coefficients which are convertible into the linear prediction coefficients of more than one order, is larger than or equal to a predetermined threshold value Th1 and/or (B-1) an index Q? commensurate with how short the peak-to-valley height of the spectral envelope is, is smaller than or equal to a predetermined threshold value Th1?.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: August 13, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Publication number: 20190245624
    Abstract: A driver circuit 11 includes a plurality of cascode-connected NMOS transistors, a modulating signal VGN1 is applied to a gate terminal of a lowermost stage transistor TN1 located at a lowermost stage out of the NMOS transistors, and an upper stage bias potential VGN2 that is a sum of a minimum gate-source voltage VGN1min and a maximum drain-source voltage VDS1max of a transistor (TN1) located immediately below an upper stage transistor located at an upper stage above the lowermost stage transistor of the NMOS transistors is applied to the upper stage transistor TN2.
    Type: Application
    Filed: October 16, 2017
    Publication date: August 8, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toshiki KISHI, Munehiko NAGATANI, Shinsuke NAKANO, Hiroaki KATSURAI, Masafumi NOGAWA, Hideyuki NOSAKA
  • Publication number: 20190245317
    Abstract: An optical amplifier of the present disclosure includes an optical resonator that includes an amplification fiber capable of amplifying signal light having one or more propagation modes and resonates at least one propagation mode of the signal light amplified by the amplification fiber; an excitation light source that outputs excitation light for exciting the amplification fiber; and a multiplexer that multiplexes the signal light and the excitation light, in which the optical resonator includes a gain clamp setting unit which sets gain clamp for at least one propagation mode out of a plurality of propagation modes resonating in the optical resonator.
    Type: Application
    Filed: October 25, 2017
    Publication date: August 8, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masaki WADA, Shinichi AOZASA, Taiji SAKAMOTO, Takashi YAMAMOTO, Kazuhide NAKAJIMA, Takayoshi MORI
  • Publication number: 20190244604
    Abstract: A model learning device comprises: an initial value setting part that uses a parameter of a learned first model including a neural network to set a parameter of a second model including a neural network having a same network structure as the first model; a first output probability distribution calculating part that calculates a first output probability distribution including a distribution of an output probability of each unit on an output layer, using learning features and the first model; a second output probability distribution calculating part that calculates a second output probability distribution including a distribution of an output probability of each unit on the output layer, using learning features and the second model; and a modified model update part that obtains a weighted sum of a second loss function calculated from correct information and from the second output probability distribution, and a cross entropy between the first output probability distribution and the second output probability dis
    Type: Application
    Filed: September 5, 2017
    Publication date: August 8, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirokazu MASATAKI, Taichi ASAMI, Takashi NAKAMURA, Ryo MASUMURA
  • Patent number: 10374107
    Abstract: An optical waveguide integrated light receiving element includes an optical waveguide (105) arranged on a side of a second contact layer (102) opposite to a side where a light absorption layer (103) is arranged, having a waveguide direction parallel to a plane of the light absorption layer (103), and optically coupled with the second contact layer (102). The second contact layer (102) has, in a planar view, a size of an area smaller than that of the light absorption layer (103) and arranged inside the light absorption layer (103).
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: August 6, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masahiro Nada, Yoshifumi Muramoto, Hideaki Matsuzaki
  • Patent number: 10375402
    Abstract: An image encoding method that encodes an image so as to optimize estimated values of processing units which are a coding unit, a prediction unit, and a transform unit by selecting sizes of the individual processing units. The method includes a division step that divides an image having a size of the coding unit into a plurality of blocks; an activity computation step that computes activities pertaining to the individual blocks; and a transform unit size determination step that determines, based on the computed activities, a size pattern of the transform unit within the image having the size of the coding unit.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: August 6, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tokinobu Mitasaki, Naoki Ono, Atsushi Shimizu
  • Patent number: 10371821
    Abstract: A navigation satellite signal reception apparatus includes a satellite antenna; a satellite orbital information collection unit that collects orbital information of a navigation satellite; a peripheral environment spatial information collection unit that collects spatial information for a peripheral environment of an installation position of the satellite antenna; a positional information collection unit that collects positional information for the installation position of the satellite antenna; and a signal correction unit that performs a determination process to determine whether a navigation satellite associated with the received satellite signal is in a directly viewable state or in a non-directly-viewable state from the installation position of the satellite antenna, and that performs a correction process on a satellite signal from a navigation satellite in an NLOS state, on the assumption that the satellite signal is a reflected wave.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: August 6, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Keisuke Nishi, Seiji Yoshida, Takashi Hirose
  • Publication number: 20190236077
    Abstract: According to an aspect of the invention, a data processing apparatus is provided. The data processing apparatus includes a data processing unit. The data processing unit is configured to perform at least part of: preprocessing on a data processing request to a common database issued by one of a plurality of applications accessing the common database; and post-processing on a search result returned from the common database in response to the data processing request.
    Type: Application
    Filed: October 17, 2017
    Publication date: August 1, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Keiichiro KASHIWAGI, Tomoyuki FUJINO, Koki MITANI, Yui YOSHIDA
  • Publication number: 20190231225
    Abstract: A lactate working threshold-estimating device includes: an acquiring unit configured to acquire information on a gait of a person whose lactate working threshold value is to be estimated from a sensor installed on the person; and an estimating unit configured to estimate the lactate working threshold value of the person on the basis of the acquired information.
    Type: Application
    Filed: September 8, 2017
    Publication date: August 1, 2019
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Shingo TSUKADA, Nahoko KASAI, Hiroshi NAKASHIMA, Hideo HATTA
  • Publication number: 20190238523
    Abstract: A communication terminal shares a session key with and sends cipher text to another communication terminal via a server device, including: a common key cipher text obtaining unit that encrypts a message based on a common key to obtain common key cipher text; a function computation result obtaining unit that computes the common key and the session key based on a predetermined first function to obtain a function computation result; a public key cipher text obtaining unit that encrypts the function computation result based on a public key to obtain public key cipher text; and a cipher text sending unit that sends the common key cipher text and the public key cipher text to the server device. The communication terminal can update data previously saved in a server to data that can be decrypted on the communication terminal side using an updated session key, without the server decrypting the data.
    Type: Application
    Filed: July 6, 2017
    Publication date: August 1, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yuki OKANO, Reo YOSHIDA, Ryo NISHIMAKI, Tetsutaro KOBAYASHI
  • Publication number: 20190238372
    Abstract: A radio communication system includes a radio apparatus and a signal processing apparatus that function as a base station, and the radio apparatus includes a channel estimation unit that, on the basis of a radio signal transmitted from a terminal apparatus, estimates channel information relating to a radio transmission path between the radio apparatus and the terminal apparatus; a demodulation unit that performs soft-decision demodulation of the radio signal on the basis of the channel information estimated by the channel estimation unit; a signal switching unit that, depending on the terminal apparatus that transmitted the radio signal, switches an output destination of a log likelihood ratio obtained by the soft-decision modulation between either a first path passing through a decoding unit that decodes the log likelihood ratio or a second path not passing through the decoding unit; and a transmission unit that transmits a signal output from the first path or the second path to the signal processing apparat
    Type: Application
    Filed: November 6, 2017
    Publication date: August 1, 2019
    Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kenji MIYAMOTO, Jun TERADA, Tatsuya SHIMIZU
  • Patent number: 10366236
    Abstract: In accordance with codes of applications, it is determined whether the applications access predetermined privacy information due to permission, a first label is assigned to an application that is determined to make an access, and a second label to an application that is determined not to make an access. The score of each word is calculated such that a high score is set to a word that is included in the text of the description of the application, to which the first label is assigned, more often than in the text of the description of the application, to which the second label is assigned, and a predetermined number of words at the top with regard to the score is extracted. The application whose text of the description includes the extracted word is classified as an application that refers to the permission.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: July 30, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Mitsuaki Akiyama, Takeshi Yagi, Tatsuya Mori, Takuya Watanabe
  • Publication number: 20190228010
    Abstract: A secure equijoin technique of generating one table from two tables while curbing the volume of communications traffic is provided. The technique includes: a first permutation generating means 110 that generates a permutation <?> from an element sequence which is generated from the first column of a table L and the first column of a table R; a first column generating means 120 that generates, for j=2, . . . , a, by using the permutation <?>, a prefix sum, and an inverse permutation <??1>, the j-th column of a table J from an element sequence which is generated from the to j-th column of the table L; a join-result element sequence generating means 130 that generates a join-result element sequence from an element sequence ([[1]], . . . , [[1]], [[0]], . . . , [[0]], [[?1]], . . . , [[?1]]) by using the permutation <?>, the prefix sum, and the inverse permutation <??1 >; a second column generating means 140 that generates, for j=a+1, . . .
    Type: Application
    Filed: September 14, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Dai IKARASHI, Naoto KIRIBUCHI, Koki HAMADA, Gembu MOROHASHI
  • Publication number: 20190227248
    Abstract: An optical fiber cable includes: a core comprising gathered optical fibers; an inner sheath housing the core; a wire body embedded in the inner sheath; tension members embedded in the inner sheath, wherein the core is interposed between the tension members; a reinforcing sheet that covers the inner sheath; and an outer sheath that covers the reinforcing sheet, wherein in the inner sheath, ti<Ti and to<To are satisfied, where a thickness of a radially inner portion between the core and the wire body is ti, a thickness of a radially inner portion between the core and each of the tension members is Ti, a thickness of a radially outer portion between the wire body and the reinforcing sheet is to, a thickness of a radially outer portion between each of the tension members and the reinforcing sheet is To.
    Type: Application
    Filed: July 31, 2017
    Publication date: July 25, 2019
    Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Mizuki Isaji, Masatoshi Ohno, Shinnosuke Sato, Kouji Tomikawa, Akira Namazue, Ken Osato, Naoki Nakagawa, Yuji Aoyagi, Shigekatsu Tetsutani
  • Publication number: 20190230198
    Abstract: A flow information analysis apparatus receives flow information containing a header sample, determines whether the header sample of the flow information matches any of templates that are based on tunneling protocols, and when determining that the header sample matches any of the templates, extract information on a header of the IP packet from the header sample on the basis of the matched template. Further, when determining that the header sample does not match any of the templates, the flow information analysis apparatus extracts information on the header of the IP packet from the header sample on the basis of a result of a search through the header sample for a byte sequence that matches search data in which a value that is set in a specific field of the tunnel header and a value that is set in a specific field of the IP packet are combined.
    Type: Application
    Filed: August 9, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroshi KURAKAMI, Kazunori KAMIYA, Hiroyuki NOOKA, Daigo NATSUME
  • Publication number: 20190228291
    Abstract: A time-series-data feature extraction device includes: a data processing unit that processes a received unevenly spaced time-series-data group into an evenly spaced time-series-data group including omissions and an omission information group indicating presence or absence of omissions, based on a received input time-series data length and a received minimum observation interval; a model learning unit that learns a weight vector of each layer of a model with a difference between an element not missing in a matrix of the evenly spaced time-series-data group including omissions and an element of an output result of an output layer of the model being taken as an error, and stores the weight vector as a model parameter in a storage unit, the difference being; and a feature extraction unit that receives time-series data of a feature extraction target, calculates a value of the intermediate layer of the model with use of the model parameter stored in the storage unit by inputting the received time-series data of the
    Type: Application
    Filed: August 28, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hisashi KURASAWA, Katsuyoshi HAYASHI, Akinori FUJINO, Takayuki OGASAWARA, Masumi YAMAGUCHI, Shingo TSUKADA, Hiroshi NAKASHIMA
  • Publication number: 20190229904
    Abstract: Fisher's exact test is efficiently computed through secure computation. A computation range determination part 12 determines i0, i1, x0, x1. A preliminary computation part 13 computes f(x0), . . . , f(x1), and generates an array M=(f(x0), . . . , f(x1)). A securing part 14 secures the array M, and generates a secure text array <M>=(<f(x0)>, . . . , <f(x1)>). A batch-reading part 15 executes the following formulae, and generates a function value secure text (<f(ai)>, <f(bi)>, <f(ci)>, <f(di)>)(i0?i?i1). (<f(ai0)>,<f(ai0+1)>, . . . ,<f(ai1)>)?BatchRead(<M>;<a>;i0,i0+1, . . . ,i1), (<f(bi0)>,<f(bi0+1)>, . . . ,<f(bi1)>)?BatchRead(<M>;<b>;?i0,?(i0+1, . . . ,?i1), (<f(ci0)>,<f(ci0+1)>, . . . ,<f(ci1)>)?BatchRead(<M>;<c>;?i0,?(i0+1, . . . ,?i1), (<f(di0)>,<f(di0+1)>, . . . ,<f(di1)>)?BatchRead(<M>;<d>;i0,i0+1, . . .
    Type: Application
    Filed: June 30, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Koki HAMADA
  • Patent number: 10361807
    Abstract: An OLT configures combinations of wavelength pairs used for upstream and downstream signals, in a wavelength multiplexing optical communication system which performs single-core bidirectional transmission of a plurality of upstream and downstream signals, in such a way that the maximum value of the chromatic dispersion delay amount calculated from each wavelength pair is less than the maximum value of the chromatic dispersion delay amounts calculated when the combinations of wavelength pairs used for upstream and downstream signals are both allocated from the short wave side.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: July 23, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Katsuhisa Taguchi, Tomoaki Yoshida, Kota Asaka, Shunji Kimura
  • Patent number: 10361841
    Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: July 23, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Go Yamamoto, Tetsutaro Kobayashi