Patents by Inventor Hirofumi Araki
Hirofumi Araki 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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Patent number: 11433420Abstract: A solution supply apparatus is for supplying a treatment solution to a treatment solution discharger which discharges the treatment solution to a treatment object. The solution supply apparatus includes: a supply pipe line connected to the treatment solution discharger; a filter provided on the supply pipe line which filters the treatment solution to remove foreign substances; and a controller. The controller performs a determination of a state of the treatment solution to be supplied to a primary side of the filter and, when the state of the treatment solution is determined to be bad, outputs a control signal for restricting supply of the treatment solution to the primary side of the filter.Type: GrantFiled: December 7, 2018Date of Patent: September 6, 2022Assignee: Tokyo Electron LimitedInventors: Ryouichirou Naitou, Masato Hayashi, Hideo Shite, Hiroyuki Ide, Yosuke Kameda, Seiya Totsuka, Atsumu Maita, Takami Satoh, Hirofumi Araki, Kentaro Yoshihara
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Publication number: 20220207603Abstract: Disclosed is a management system for management of schedules of delivery of products directed to users that allows users to exchange products before delivery of the products. A management server in the management system manages schedules of delivery of products directed to users using a database. A first receiver receives a first selection of selecting a first schedule of delivery of a first product directed to a first user defined as a first destination, from a first terminal used by the first user. A second receiver receives a second selection of selecting a second schedule of delivery of a second product directed to a second user defined as a second destination from a second terminal used by the second user. In response to reception of the first and second selections, an exchanger exchanges the first destination involved in the first schedule with the second destination involved in the second schedule.Type: ApplicationFiled: December 7, 2021Publication date: June 30, 2022Applicant: Rakuten Group, Inc.Inventor: Hirofumi ARAKI
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Publication number: 20200290080Abstract: A solution supply apparatus for supplying a treatment solution to a treatment solution discharger configured to discharge the treatment solution to a treatment object, the solution supply apparatus includes: a supply pipe line connected to the treatment solution discharger; a filter provided on the supply pipe line and configured to filter the treatment solution to remove foreign substances; and a controller configured to perform a determination of a state of the treatment solution to be supplied to a primary side of the filter and, when the state of the treatment solution is determined to be bad, to output a control signal for restricting supply of the treatment solution to the primary side of the filter.Type: ApplicationFiled: December 7, 2018Publication date: September 17, 2020Inventors: Ryouichirou NAITOU, Masato HAYASHI, Hideo SHITE, Hiroyuki IDE, Yosuke KAMEDA, Seiya TOTSUKA, Atsumu MAITA, Takami SATOH, Hirofumi ARAKI, Kentaro YOSHIHARA
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Publication number: 20190149258Abstract: A transmission and reception apparatus, includes a processor and a processing device coupled to the processor, wherein the processor is configured to detect insertion of a pluggable module, issue, when the insertion of the pluggable module is detected, an instruction to the processing device to generate a first test signal to be supplied to the pluggable module, extract an alternating current component from a first monitoring result of the first test signal by the pluggable module and acquiring pulse width information at a plurality of phase points, and set a phase point determined based on the pulse width information as an optimum phase value to the processing device.Type: ApplicationFiled: November 15, 2018Publication date: May 16, 2019Applicant: FUJITSU LIMITEDInventors: Hirofumi Araki, Hisayuki Ojima, Yasushi YOSHINO, Satoru Saitoh, KAZUYA IKEDA, TAICHI ISHIKAWA
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Optical transmission apparatus, optical transmission system, and polarization dependent loss monitor
Patent number: 9882647Abstract: An optical transmission apparatus includes: a coherent detector configured to receive light including different polarization components from an optical transmission path, and perform coherent detection of received light including the different polarization components; an adaptive equalizer configured to adaptively equalize, by a digital filter, a complex electric signal for each of the polarization components obtained by the coherent detection, a gain value for controlling an amplitude of the complex electric signal being applied to the complex electric signal; and a polarization dependent loss monitor configured to determine a polarization dependent loss of the optical transmission path, based on a correction filter parameter obtained by correcting a filter parameter of the digital filter according to the gain value, the filter parameter being adaptively updated by an adaptive equalization of the adaptive equalizer.Type: GrantFiled: February 2, 2016Date of Patent: January 30, 2018Assignee: FUJITSU LIMITEDInventors: Taketo Endo, Kosuke Komaki, Taku Saito, Hirofumi Araki, Makoto Shimizu, Hiroshi Nishida -
Patent number: 9722704Abstract: An optical transmission apparatus includes: an optical receiver configured to receive an optical signal; a variable optical attenuator configured to adjust a power of the optical signal to be input to the optical receiver according to a variable attenuation amount; and a controller configured to control the attenuation amount of the variable optical attenuator based on an electrical signal obtained by performing a coherent detection and a photoelectric conversion on the optical signal received by the optical receiver.Type: GrantFiled: February 1, 2016Date of Patent: August 1, 2017Assignee: FUJITSU LIMITEDInventors: Taku Saito, Kosuke Komaki, Taketo Endo, Shuzo Matsushita, Hirofumi Araki, Hiroshi Nishida, Makoto Shimizu
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Patent number: 9667346Abstract: An optical transmission system includes: a transmission node to transmit wavelength-multiplexed light of a plural wavelengths arranged in a predetermined transmission band; and a reception node to receive the wavelength-multiplexed light, and to include a monitor to monitor a detection sensitivity indicating a sampling phase shift with respect to a phase of light corresponding to one among the received plural wavelengths, and a transmitter to transmit information indicating that the monitored detection sensitivity for light corresponding to a wavelength adjacent to an outer edge of the transmission band, among the plural wavelengths, has been reduced below a threshold value, to the transmission node, wherein the transmission node includes a receiver to receive information indicating a reduction in the detection sensitivity, and a controller to stop wavelength control of shifting the wavelength adjacent to the outer edge in a direction approaching the outer edge in response to reception of the information.Type: GrantFiled: January 4, 2016Date of Patent: May 30, 2017Assignee: FUJITSU LIMITEDInventors: Hirofumi Araki, Taku Saito, Yoshitaka Taki, Satoru Miyazaki
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Patent number: 9564964Abstract: An optimization unit in an optical receiver divides a symbol region out of a plurality of symbol regions into which signal points that specifies symbol information included in an optical signal are classified, into a plurality of division regions from the symbol center coordinate of the symbol region. Moreover, the optimization unit accumulates the signal points of the symbol information for every division region in the symbol region. Furthermore, based on the accumulated number of signal points for every division region, the optimization unit controls the average length of a phase estimation unit when the phase noise of the optical signal is calculated.Type: GrantFiled: June 3, 2014Date of Patent: February 7, 2017Assignee: FUJITSU LIMITEDInventors: Taku Saito, Katsumi Fukumitsu, Osamu Takeuchi, Hirofumi Araki, Kanji Naito, Shoichi Murakami
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Publication number: 20160248513Abstract: An optical transmission apparatus includes: an optical receiver configured to receive an optical signal; a variable optical attenuator configured to adjust a power of the optical signal to be input to the optical receiver according to a variable attenuation amount; and a controller configured to control the attenuation amount of the variable optical attenuator based on an electrical signal obtained by performing a coherent detection and a photoelectric conversion on the optical signal received by the optical receiver.Type: ApplicationFiled: February 1, 2016Publication date: August 25, 2016Applicant: FUJITSU LIMITEDInventors: Taku Saito, Kosuke Komaki, Taketo Endo, Shuzo Matsushita, Hirofumi Araki, Hiroshi Nishida, Makoto Shimizu
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OPTICAL TRANSMISSION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND POLARIZATION DEPENDENT LOSS MONITOR
Publication number: 20160241341Abstract: An optical transmission apparatus includes: a coherent detector configured to receive light including different polarization components from an optical transmission path, and perform coherent detection of received light including the different polarization components; an adaptive equalizer configured to adaptively equalize, by a digital filter, a complex electric signal for each of the polarization components obtained by the coherent detection, a gain value for controlling an amplitude of the complex electric signal being applied to the complex electric signal; and a polarization dependent loss monitor configured to determine a polarization dependent loss of the optical transmission path, based on a correction filter parameter obtained by correcting a filter parameter of the digital filter according to the gain value, the filter parameter being adaptively updated by an adaptive equalization of the adaptive equalizer.Type: ApplicationFiled: February 2, 2016Publication date: August 18, 2016Inventors: Taketo Endo, Kosuke Komaki, Taku Saito, Hirofumi Araki, Makoto SHIMIZU, Hiroshi Nishida -
Patent number: 9413522Abstract: An optical transceiver converts a received optical signal to an electric signal and converts the electric signal to a digital signal, and has an adaptive equalizer to adaptively equalize the digital signal, a synchronization part to synchronize a first polarized wave and a second polarized wave contained in the adaptively equalized digital signal and having polarization axes perpendicular to each other, and a symbol offset determination part to determine an amount of symbol offset between the first polarized wave and the second polarized wave based upon symbol synchronization information of the first polarized wave and the second polarized wave supplied from the synchronization part, the symbol offset determination part being configured to repeat determination of the amount of symbol offset and restart the adaptive equalizer until the symbol offset is minimized.Type: GrantFiled: February 12, 2015Date of Patent: August 9, 2016Assignee: FUJITSU LIMITEDInventors: Daijiro Tanaka, Osamu Takeuchi, Taku Saito, Hirofumi Araki, Katsumi Fukumitsu
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Patent number: 9407471Abstract: A method of tap coefficient correction includes: obtaining a synchronization symbol difference between a first polarization and a second polarization orthogonal to the first polarization; obtaining a delay amount of each of the first polarization and the second polarization in an adaptive equalizer; calculating, in a case where a horizontal axis represents a tap number and a vertical axis represents a tap coefficient and a tap number or a nearest tap number with which an area of a drawn figure is halved is set as a gravity center of tap coefficients, a correction reference gravity center of the tap coefficients set in the adaptive equalizer, based on the synchronization symbol difference and the delay amount; and performing a correction of shifting an entire tap coefficients in units of symbol to cause the correction reference gravity center to be closest to a tap center.Type: GrantFiled: November 18, 2013Date of Patent: August 2, 2016Assignee: FUJITSU LIMITEDInventors: Taku Saito, Nobukazu Koizumi, Hisao Nakashima, Osamu Takeuchi, Hirofumi Araki
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Publication number: 20160204875Abstract: An optical transmission system includes: a transmission node to transmit wavelength-multiplexed light of a plural wavelengths arranged in a predetermined transmission band; and a reception node to receive the wavelength-multiplexed light, and to include a monitor to monitor a detection sensitivity indicating a sampling phase shift with respect to a phase of light corresponding to one among the received plural wavelengths, and a transmitter to transmit information indicating that the monitored detection sensitivity for light corresponding to a wavelength adjacent to an outer edge of the transmission band, among the plural wavelengths, has been reduced below a threshold value, to the transmission node, wherein the transmission node includes a receiver to receive information indicating a reduction in the detection sensitivity, and a controller to stop wavelength control of shifting the wavelength adjacent to the outer edge in a direction approaching the outer edge in response to reception of the information.Type: ApplicationFiled: January 4, 2016Publication date: July 14, 2016Applicant: FUJITSU LIMITEDInventors: Hirofumi Araki, Taku Saito, Yoshitaka Taki, Satoru Miyazaki
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Publication number: 20160142300Abstract: A transmission system includes: a first transmission device configured to transmit an input signal to a second transmission device via a transmission section, the first transmission device preforms operations of: saving overhead information included in a first frame of the input signal from a region in use to an unused region of the first frame, the overhead information corresponding to an object of termination in the transmission section; and transmitting, to the transmission section, a first signal including a second frame in which the overhead information is saved.Type: ApplicationFiled: October 29, 2015Publication date: May 19, 2016Applicant: FUJITSU LIMITEDInventors: Hirofumi Araki, Hiroshi Oikawa, Yoshitaka TAKI, SATORU MIYAZAKI
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Publication number: 20150229401Abstract: An optical transceiver converts a received optical signal to an electric signal and converts the electric signal to a digital signal, and has an adaptive equalizer to adaptively equalize the digital signal, a synchronization part to synchronize a first polarized wave and a second polarized wave contained in the adaptively equalized digital signal and having polarization axes perpendicular to each other, and a symbol offset determination part to determine an amount of symbol offset between the first polarized wave and the second polarized wave based upon symbol synchronization information of the first polarized wave and the second polarized wave supplied from the synchronization part, the symbol offset determination part being configured to repeat determination of the amount of symbol offset and restart the adaptive equalizer until the symbol offset is minimized.Type: ApplicationFiled: February 12, 2015Publication date: August 13, 2015Inventors: Daijiro TANAKA, Osamu TAKEUCHI, Taku SAITO, Hirofumi ARAKI, Katsumi FUKUMITSU
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Publication number: 20140363154Abstract: An optimization unit in an optical receiver divides a symbol region out of a plurality of symbol regions into which signal points that specifies symbol information included in an optical signal are classified, into a plurality of division regions from the symbol center coordinate of the symbol region. Moreover, the optimization unit accumulates the signal points of the symbol information for every division region in the symbol region. Furthermore, based on the accumulated number of signal points for every division region, the optimization unit controls the average length of a phase estimation unit when the phase noise of the optical signal is calculated.Type: ApplicationFiled: June 3, 2014Publication date: December 11, 2014Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITEDInventors: Taku SAITO, Katsumi Fukumitsu, Osamu Takeuchi, Hirofumi Araki, Kanji Naito, Shoichi Murakami
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Publication number: 20140212132Abstract: A method of tap coefficient correction includes: obtaining a synchronization symbol difference between a first polarization and a second polarization orthogonal to the first polarization; obtaining a delay amount of each of the first polarization and the second polarization in an adaptive equalizer; calculating, in a case where a horizontal axis represents a tap number and a vertical axis represents a tap coefficient and a tap number or a nearest tap number with which an area of a drawn figure is halved is set as a gravity center of tap coefficients, a correction reference gravity center of the tap coefficients set in the adaptive equalizer, based on the synchronization symbol difference and the delay amount; and performing a correction of shifting an entire tap coefficients in units of symbol to cause the correction reference gravity center to be closest to a tap center.Type: ApplicationFiled: November 18, 2013Publication date: July 31, 2014Applicant: FUJITSU LIMITEDInventors: Taku Saito, Nobukazu Koizumi, Hisao Nakashima, Osamu Takeuchi, Hirofumi Araki
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Patent number: 6628103Abstract: A power factor control apparatus comprises a target power factor setting section which sets a target power factor range of the plurality of power generators in a fixed cycle, a comparing section which compares a voltage of a bus with a predetermined voltage value range, a first control section which performs control, based on a result of the comparing section, to drop a voltage of at least one power generator whose power factor is the lowest, and raise a voltage of at least one power generator whose power factor is the highest, and a second control section which performs control of a voltage of a power generator, whose power factor is out of the target power factor range, such that the power factor thereof falls within the target power factor range.Type: GrantFiled: March 27, 2002Date of Patent: September 30, 2003Assignees: Mitsubishi Heavy Industries, Ltd., Mitsubishi Denki Kabushiki KaishaInventors: Daisuke Sumiya, Shinichi Koyanagi, Hirofumi Araki
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Publication number: 20030037297Abstract: The present invention provides a frame synchronization device for receiving frames and establishing frame synchronization. The frame synchronization device attempts to detect a first synchronization data in a received data in a frame hunting state, and enters a synchronous state when the first synchronization data is detected for a first predetermined number of consecutive frames. The device corrects errors of the data in the frame based on a check data in the frame. And the device attempts to detect a second synchronization data in the corrected frame, and returns to the frame hunting state when the second synchronization data is not detected.Type: ApplicationFiled: December 18, 2001Publication date: February 20, 2003Inventor: Hirofumi Araki
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Publication number: 20020140406Abstract: A power factor control apparatus comprises a target power factor setting section which sets a target power factor range of the plurality of power generators in a fixed cycle, a comparing section which compares a voltage of a bus with a predetermined voltage value range, a first control section which performs control, based on a result of the comparing section, to drop a voltage of at least one power generator whose power factor is the lowest, and raise a voltage of at least one power generator whose power factor is the highest, and a second control section which performs control of a voltage of a power generator, whose power factor is out of the target power factor range, such that the power factor thereof falls within the target power factor range.Type: ApplicationFiled: March 27, 2002Publication date: October 3, 2002Inventors: Daisuke Sumiya, Shinichi Koyanagi, Hirofumi Araki