Patents by Inventor Jun Sakai

Jun Sakai 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).

  • Publication number: 20210386290
    Abstract: The blood flow analysis apparatus includes an acquisition unit and an extractor. The acquisition unit is configured to acquire blood flow information representing time-course changes in a blood flow velocity of a single retinal artery or retinal vein. The extractor is configured to extract one or more parameters corresponding to change in the blood flow velocity from the blood flow information.
    Type: Application
    Filed: May 13, 2021
    Publication date: December 16, 2021
    Applicants: National University Corporation ASAHIKAWA MEDICAL UNIVERSITY, Topcon Corporation
    Inventors: Akitoshi YOSHIDA, Kana MINAMIDE, Masahiro AKIBA, Jun SAKAI
  • Publication number: 20210356552
    Abstract: The present disclosure provides a mechanism for making it possible to efficiently determine an optimal configuration set for one or more sensors for use for estimating the state of an object. Information processing apparatus is provided, which includes an obtaining unit configured to obtain a spatial distribution model of accuracy of estimation related to a state of an object, performed using one or more sensors, a calculation unit configured to calculate a representative statistic for evaluating the accuracy of estimation based on the spatial distribution model obtained, and an optimization unit configured to determine an optimal set of sensor configurations for the one or more sensors based on representative statistics calculated respectively for different sets of sensor configurations for the one or more sensors.
    Type: Application
    Filed: October 8, 2019
    Publication date: November 18, 2021
    Applicant: NEC Corporation
    Inventor: Jun SAKAI
  • Publication number: 20210359775
    Abstract: A transmission apparatus recognition apparatus includes a receiver configured to receives a signal wirelessly transmitted from a transmission apparatus, a signal region detector, a feature extractor, and a recognizer. The signal region detector generates a spectrogram from a received signal received by the receiver, and detects a signal region parameter indicating a specific signal region based on the spectrogram. The feature extractor converts the received signal based on a signal conversion parameter according to the signal region parameter, and extracts a feature from the converted signal. The recognizer calculates a degree of similarity based on the extracted feature and a feature stored in advance, and recognizes the transmission apparatus based on the degree of similarity. The transmission apparatus recognition apparatus adjusts the signal region parameter based on a recognition accuracy of the recognizer.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 18, 2021
    Applicant: NEC Corporation
    Inventors: Taichi Ohtsuji, Jun Sakai
  • Publication number: 20210258742
    Abstract: An apparatus for estimating the number of people according to the present disclosure includes at least one memory configured to store an instruction and at least one processor configured to execute the instruction, the memory and the processor being configured to group signals of terminals acquired within a predetermined time, extract first identifiers of the terminals from the signals included in the group, classify the first identifiers into first identifiers assigned to a global network and those assigned to a local network, count the first identifiers assigned to the global network, and estimate the number of people by using the number of the first identifiers assigned to the global network.
    Type: Application
    Filed: February 11, 2021
    Publication date: August 19, 2021
    Applicant: NEC Corporation
    Inventors: Jun SAKAI, Toshiki TAKEUCHI, Masao TANIGUCHI
  • Patent number: 11055858
    Abstract: A method measures a meandering amount of a strip, which is capable of reducing troubles. In the method of measuring a meandering amount of a strip during conveyance, an imaging means is arranged in one side of the strip at a state of tilting an optical axis thereof to a pass line plane of the strip and a light is arranged in the other side of the strip to irradiate light to the strip from the back of the strip viewing from the imaging means, and the strip is shot by the imaging means from an oblique side to include both edges of the strip and the edge of the strip is detected with an image shot by the imaging means and a meandering amount of the strip is calculated based on the detected edge position information of the strip from a standard position.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: July 6, 2021
    Assignee: JFE Steel Corporation
    Inventors: Jun Sakai, Toru Nakashima
  • Patent number: 11013400
    Abstract: An ophthalmic apparatus of an exemplary embodiment is capable of applying OCT to the fundus of a subject's eye, and includes an optical system, an optical scanner, an optical path length changing device, and a controller. The optical system splits light output front a light source into measurement light and reference light, projects the measurement light onto the fundus, generates interference light by superposing returning light of the measurement light from the subject's eye on the reference light, and detects the interference light. The optical scanner deflects the measurement light for scanning the fundus. The optical path length changing device changes at least one of an optical path length of the measurement light and an optical path length of the reference light. The controller controls the optical scanner based on at least the optical path length.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: May 25, 2021
    Assignee: TOPCON CORPORATION
    Inventors: Kouta Fujii, Makoto Saika, Jun Sakai
  • Patent number: 10918277
    Abstract: The present invention provides an ophthalmic device capable of minimizing the generation of flare at a lower cost and in a shorter time than in the prior arts when photographing in a state where an optical axis of an examination optical system is deviated from a reference position of a subject eye.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: February 16, 2021
    Assignee: TOPCON CORPORATION
    Inventors: Yoki Okuda, Jun Sakai
  • Publication number: 20210038075
    Abstract: A blood flow measuring unit of a blood flow measurement apparatus of an embodiment includes an optical system for applying an OCT scan to an eye fundus and obtains blood flow information based on data acquired by the OCT scan. A movement mechanism moves the optical system. A controller applies a first movement control to the movement mechanism to move the optical system in a first direction orthogonal to an optical axis of the optical system by a predetermined distance from the optical axis. A judging unit judges occurrence of vignetting based on a detection result of return light of light incident on the eye through the optical system after the first movement control. The controller applies a second movement control to the movement mechanism to further move the optical system based on a judgement result obtained by the judging unit.
    Type: Application
    Filed: December 26, 2018
    Publication date: February 11, 2021
    Applicant: TOPCON CORPORATION
    Inventors: Jun SAKAI, Shunsuke NAKAMURA, Kana NISHIKAWA, Masahiro AKIBA
  • Publication number: 20210007600
    Abstract: An exemplary OCT apparatus includes a scanner, controller, phase information generator, phase information processor. The scanner applies an OCT scan to an object using an optical scanner. The controller controls the scanner to perform a first scan that scans a cross section of the object in a first scan direction and a second scan that scans a cross section of the object in a second scan direction opposite to the first scan direction. The phase information generator generates first phase information based on first acquisition data acquired by the first scan and second phase information based on second acquisition data acquired by the second scan. The phase information processor generates composite phase information based on the first phase information and the second phase information.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 14, 2021
    Applicant: TOPCON CORPORATION
    Inventors: Jun SAKAI, Toshihiro MINO
  • Patent number: 10881294
    Abstract: An ophthalmic apparatus of an embodiment include a data acquisition device, distribution data generator, correction value calculator, magnification corrector, and data comparator. The data acquisition device acquires three dimensional data by applying OCT to the fundus of a subject's eye. The distribution data generator generates distribution data of a predetermined measurement value in the fundus based on the three dimensional data. The correction value calculator calculates a magnification correction value based on a predetermined condition for acquiring the three dimensional data. The magnification corrector changes at least one of the size of standard distribution data generated in advance for the predetermined measurement value and the size of the distribution data, based on the magnification correction value. The data comparator compares the distribution data with the standard distribution data, at least one of whose sizes has been changed by the magnification corrector.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: January 5, 2021
    Assignee: TOPCON CORPORATION
    Inventors: Kouta Fujii, Makoto Saika, Jun Sakai
  • Patent number: 10879423
    Abstract: An ultraviolet light-emitting element includes: a multilayer stack in which an n-type AlGaN layer, a light-emitting layer, a first p-type AlGaN layer, and a second p-type AlGaN layer are arranged in this order; a negative electrode; and a positive electrode. The first p-type AlGaN layer has a larger Al composition ratio than first AlGaN layers serving as well layers. The second p-type AlGaN layer has a larger Al composition ratio than the first AlGaN layers. The first p-type AlGaN layer and the second p-type AlGaN layer both contain Mg. The second p-type AlGaN layer has a higher maximum Mg concentration than the first p-type AlGaN layer. The second p-type AlGaN layer includes a region where an Mg concentration increases in a thickness direction thereof as a distance from the first p-type AlGaN layer increases in the thickness direction.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: December 29, 2020
    Assignees: PANASONIC CORPORATION, RIKEN
    Inventors: Takayoshi Takano, Takuya Mino, Jun Sakai, Norimichi Noguchi, Hideki Hirayama
  • Publication number: 20200379080
    Abstract: A location estimation system includes a location estimation part that estimates a location of a radio wave transmission source by using radio wave strengths received by a plurality of radio wave sensors dispersedly placed in a predetermined area, propagation models, each of which represents a relationship between radio wave strengths and distance, and probability distribution models of the radio wave strengths. The location estimation part in the location estimation system estimates the location of the radio wave transmission source by using a propagation model set for an individual sub-area obtained by dividing the predetermined area based on locations of the radio wave sensors in the predetermined area and placement of an obstacle(s) in the predetermined area.
    Type: Application
    Filed: November 28, 2018
    Publication date: December 3, 2020
    Applicant: NEC Corporation
    Inventor: Jun SAKAI
  • Publication number: 20200370285
    Abstract: A state analysis device is capable of determining a state of the interior of piping with high precision, and includes: an index calculation means for deriving an index indicating the state of the piping, based on a flow speed of fluid flowing out of the piping, and a fluid pressure of the interior of the piping at two or more locations of the piping; and a determination means for determining the state of the piping, based on the index.
    Type: Application
    Filed: August 2, 2018
    Publication date: November 26, 2020
    Applicant: NEC CORPORATION
    Inventors: Masatake TAKAHASHI, Manabu KUSUMOTO, Jun SAKAI
  • Patent number: 10799116
    Abstract: An embodiment is a blood flow measurement device that generates blood flow information based on data collected by repeatedly scanning an interested cross section intersecting a blood vessel of an eye fundus using OCT. A data collector scans four or more cross sections intersecting the blood vessel. A first calculator determines a first gradient and second gradient of the blood vessel by analyzing a first data group and second data group among four or more pieces of data corresponding to the four or more cross sections collected by the data collector. A second calculator determines a gradient of the blood vessel at the interested cross section based on the first gradient and the second gradient. A blood flow information generator generates the blood flow information based on the gradient determined by the second calculator and the data collected by repeatedly scanning the interested cross section.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: October 13, 2020
    Assignee: TOPCON CORPORATION
    Inventors: Shunsuke Nakamura, Jun Sakai
  • Publication number: 20200288976
    Abstract: The present invention provides an ophthalmic device capable of minimizing the generation of flare at a lower cost and in a shorter time than in the prior arts when photographing in a state where an optical axis of an examination optical system is deviated from a reference position of a subject eye.
    Type: Application
    Filed: January 13, 2017
    Publication date: September 17, 2020
    Applicant: TOPCON CORPORATION
    Inventors: Yoki OKUDA, Jun SAKAI
  • Patent number: 10697089
    Abstract: An epitaxial substrate includes: a single crystal substrate including projections arranged in an array on a plane. Each projection has a conical or pyramidal shape tapered in a normal direction to the plane. The AlN layer includes: a first AlN crystal covering the plane and the projections with tips of the projections being exposed; second AlN crystals protruding from the tips of the projections along the normal direction and each having a shape of a column whose cross-sectional area increases as a distance from a tip of a corresponding projection increases; and a third AlN crystal as a layer interconnecting ends of the second AlN crystals, opposite the single crystal substrate.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: June 30, 2020
    Assignees: PANASONIC CORPORATION, RIKEN
    Inventors: Norimichi Noguchi, Takuya Mino, Takayoshi Takano, Jun Sakai, Hitomichi Takano, Kenji Tsubaki, Hideki Hirayama
  • Patent number: 10593828
    Abstract: A UV LED element, which is an exemplary ultraviolet light-emitting diode according to the present invention, includes an n-type conductive layer, a light-emitting layer, an electron block layer, and a p-type contact layer, all of which are arranged in this order. Bandgap energy of the electron block layer satisfies Econtact?EEBL, where Econtact designates bandgap energy of the p-type contact layer and EEBL designates the bandgap energy of the electron block layer. The electric apparatus includes the UV LED element as a light source for emitting an ultraviolet ray.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: March 17, 2020
    Assignees: RIKEN, PANASONIC CORPORATION
    Inventors: Hideki Hirayama, Masafumi Jo, Takuya Mino, Norimichi Noguchi, Takayoshi Takano, Jun Sakai
  • Publication number: 20200082550
    Abstract: A method measures a meandering amount of a strip, which is capable of reducing troubles. In the method of measuring a meandering amount of a strip during conveyance, an imaging means is arranged in one side of the strip at a state of tilting an optical axis thereof to a pass line plane of the strip and a light is arranged in the other side of the strip to irradiate light to the strip from the back of the strip viewing from the imaging means, and the strip is shot by the imaging means from an oblique side to include both edges of the strip and the edge of the strip is detected with an image shot by the imaging means and a meandering amount of the strip is calculated based on the detected edge position information of the strip from a standard position.
    Type: Application
    Filed: March 9, 2018
    Publication date: March 12, 2020
    Inventors: Jun Sakai, Toru Nakashima
  • Publication number: 20200049595
    Abstract: A pipe diagnosis apparatus 10 includes a time-series data acquisition unit 11 that acquires time-series data on pressure of a fluid in piping equipment to be diagnosed, a pressure change measurement unit 12 that measures the number of pressure changes in the fluid from the time-series data on the pressure of the fluid, and a failure risk estimation unit 13 that estimates a failure risk of the piping equipment based on the measured number of pressure changes and a strength of a pipe included in the piping equipment.
    Type: Application
    Filed: January 23, 2018
    Publication date: February 13, 2020
    Applicant: NEC Corporation
    Inventors: Jun SAKAI, Takahiro KUMURA, Manabu KUSUMOTO, Soichiro TAKATA
  • Patent number: 10456032
    Abstract: An ophthalmic imaging apparatus of an embodiment includes a data acquisition unit, a blood vessel enhanced image forming unit, and a blood vessel gradient distribution determination unit. The data acquisition unit is configured to acquire a three dimensional data set of a fundus of a subject's eye using optical coherence tomography (OCT). The blood vessel enhanced image forming unit is configured to form a blood vessel enhanced image based on the three dimensional data set. The blood vessel gradient distribution determination unit is configured to determine a blood vessel gradient distribution that shows gradients of blood vessels at a plurality of locations in the fundus, based on the blood vessel enhanced image.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: October 29, 2019
    Assignee: TOPCON CORPORATION
    Inventor: Jun Sakai