Patents by Inventor Yuji Ikegami
Yuji Ikegami 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: 12047115Abstract: First transmission device includes a first counter that generates counter value incremented in a specified cycle. Second transmission device includes a second counter that generates counter value incremented in the specified cycle. Polarization variation monitoring device acquires a first counter value generated by the first counter and a second counter value extracted by the first transmission device from a received frame transmitted from the second transmission device when the first transmission device detects polarization variation, and a third counter value generated by the second counter and a fourth counter value extracted by the second transmission device from a frame transmitted from the first transmission device when the second detector detects the polarization variation. The polarization variation monitoring device determines an occurrence position of the polarization variation based on the first counter value, the second counter value, the third counter value and the fourth counter value.Type: GrantFiled: September 9, 2022Date of Patent: July 23, 2024Assignee: FUJITSU LIMITEDInventors: Ichiro Yokokura, Junichi Sugiyama, Makoto Shimizu, Toshihiro Suzuki, Takeshi Noma, Hisao Nakashima, Yuji Ikegami
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Publication number: 20230087839Abstract: First transmission device includes a first counter that generates counter value incremented in a specified cycle. Second transmission device includes a second counter that generates counter value incremented in the specified cycle. Polarization variation monitoring device acquires a first counter value generated by the first counter and a second counter value extracted by the first transmission device from a received frame transmitted from the second transmission device when the first transmission device detects polarization variation, and a third counter value generated by the second counter and a fourth counter value extracted by the second transmission device from a frame transmitted from the first transmission device when the second detector detects the polarization variation. The polarization variation monitoring device determines an occurrence position of the polarization variation based on the first counter value, the second counter value, the third counter value and the fourth counter value.Type: ApplicationFiled: September 9, 2022Publication date: March 23, 2023Applicant: FUJITSU LIMITEDInventors: Ichiro YOKOKURA, Junichi SUGIYAMA, Makoto SHIMIZU, Toshihiro SUZUKI, Takeshi NOMA, Hisao NAKASHIMA, Yuji IKEGAMI
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Patent number: 11595139Abstract: A communication quality estimating device estimates an error rate of a signal with FEC capable of correcting K errors. The device obtains a frequency measurement value that indicates a frequency at which a codeword including m errors is received. The device determines a transition probability and a continuation probability included in each of a plurality of formulae, such that a frequency calculation value that is calculated using the plurality of formulae and indicates a frequency at which a codeword including m errors is received is brought close to the frequency measurement value. The device calculates a frequency at which a codeword including more than K errors is received, by using the plurality of formulae each with the determined transition probability and the determined continuation probability. The device estimates after-FEC error rate based on a result of the calculation.Type: GrantFiled: September 30, 2021Date of Patent: February 28, 2023Assignee: FUJITSU LIMITEDInventors: Junichi Sugiyama, Yuji Ikegami
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Patent number: 11588550Abstract: An optical transmission device includes: a first receiver circuit, a second receiver circuit, a switch circuit, a terminator circuit, a packet buffer, a clock generator, and a signal generator. The first receiver circuit converts an optical signal received via a first route into a first electric signal. The second receiver circuit converts an optical signal received via a second route into a second electric signal. The switch circuit selects the first electric signal or the second electric signal. The terminator circuit extracts a packet from an electric signal selected by the switch circuit. The packet buffer stores the packet extracted by the terminator circuit. The clock generator generates a clock signal. The signal generator generates a continuous signal that includes the packet stored in the packet buffer by using the clock signal.Type: GrantFiled: November 15, 2021Date of Patent: February 21, 2023Assignee: FUJITSU LIMITEDInventors: Junichi Sugiyama, Yuji Ikegami
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Publication number: 20220278747Abstract: An optical transmission device includes: a first receiver circuit, a second receiver circuit, a switch circuit, a terminator circuit, a packet buffer, a clock generator, and a signal generator. The first receiver circuit converts an optical signal received via a first route into a first electric signal. The second receiver circuit converts an optical signal received via a second route into a second electric signal. The switch circuit selects the first electric signal or the second electric signal. The terminator circuit extracts a packet from an electric signal selected by the switch circuit. The packet buffer stores the packet extracted by the terminator circuit. The clock generator generates a clock signal. The signal generator generates a continuous signal that includes the packet stored in the packet buffer by using the clock signal.Type: ApplicationFiled: November 15, 2021Publication date: September 1, 2022Applicant: FUJITSU LIMITEDInventors: Junichi Sugiyama, Yuji Ikegami
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Publication number: 20220231771Abstract: A communication quality estimating device estimates an error rate of a signal with FEC capable of correcting K errors. The device obtains a frequency measurement value that indicates a frequency at which a codeword including m errors is received. The device determines a transition probability and a continuation probability included in each of a plurality of formulae, such that a frequency calculation value that is calculated using the plurality of formulae and indicates a frequency at which a codeword including m errors is received is brought close to the frequency measurement value. The device calculates a frequency at which a codeword including more than K errors is received, by using the plurality of formulae each with the determined transition probability and the determined continuation probability. The device estimates after-FEC error rate based on a result of the calculation.Type: ApplicationFiled: September 30, 2021Publication date: July 21, 2022Applicant: FUJITSU LIMITEDInventors: Junichi Sugiyama, Yuji Ikegami
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Patent number: 9528173Abstract: High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that ? cal represented by the following equation is not more than 5.5%: ? cal (mass %)=(Cr+0.48Si)?(Ni+0.11Mn?0.0101Mn2+26.4C+20.1N)?4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.Type: GrantFiled: February 21, 2014Date of Patent: December 27, 2016Assignee: NIPPON YAKIN KOGYO CO., LTD.Inventors: Shigeru Hirata, Yuji Ikegami, Kazuhiro Yamakawa
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Publication number: 20140332117Abstract: High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that ? cal represented by the following equation is not more than 5.5%: ? cal (mass %)=(Cr+0.48Si)?(Ni+0.11Mn?0.0101Mn2+26.4C+20.1N)?4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.Type: ApplicationFiled: February 21, 2014Publication date: November 13, 2014Applicant: NIPPON YAKIN KOGYO CO., LTD.Inventors: Shigeru HIRATA, Yuji IKEGAMI, Kazuhiro YAMAKAWA
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Publication number: 20140166158Abstract: High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that ? cal represented by the following equation is not more than 5.5%: ? cal (mass %)=(Cr+0.48Si)?(Ni+0.11Mn?0.0101Mn2+26.4C+20.1N)?4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.Type: ApplicationFiled: February 21, 2014Publication date: June 19, 2014Applicant: NIPPON YAKIN KOGYO CO., LTD.Inventors: Shigeru HIRATA, Yuji IKEGAMI, Kazuhiro YAMAKAWA
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Patent number: 8737227Abstract: A packet transmission device includes a buffer stores packet data in any of queues, a queue manager outputs queue-status signals indicating whether or not transmittable packet data exists in the corresponding one of the queues, a bandwidth controller outputs token-status signals indicating whether or not an amount of the tokens accumulated at a certain period for the corresponding queue is larger than a token threshold provided for the corresponding queue, a queue selector preferentially selects any queue whose duration time of a transmittable state in which the corresponding queue status signal indicates that transmittable packet data exists in the corresponding queue and the corresponding token-status signal indicates that the amount of the accumulated tokens is larger than the token threshold provided for the corresponding queue is greater than a duration-time threshold provided for the corresponding queue, and a buffer reader controls reading of the packet data from the selected queue.Type: GrantFiled: July 23, 2012Date of Patent: May 27, 2014Assignee: Fujitsu LimitedInventors: Akihiro Hata, Atsushi Kitada, Yuji Ikegami
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Patent number: 8703047Abstract: As a stainless steel for a metal part for clothing ornament capable of working into a complicated form part and having such nonmagnetic properties that the worked part can cope with the detection through needle detecting device is provided a high-Mn austenitic stainless steel having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.03 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass %, provided that these components are contained so that ? cal (mass %) represented by the following equation (1) is not more than 5.5 mass %: ? cal (mass %)=(Cr+0.48Si+1.21Mo+2.2(V+Ti)+0.15Nb)?(Ni+0.47Cu+0.11Mn?0.0101Mn2+26.4C+20.1N)?4.7??(1) and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.Type: GrantFiled: February 26, 2010Date of Patent: April 22, 2014Assignee: Nippon Yakin Kogyo Co., Ltd.Inventors: Shigeru Hirata, Yuji Ikegami, Kazuhiro Yamakawa
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Publication number: 20130028082Abstract: A packet transmission device includes a buffer stores packet data in any of queues, a queue manager outputs queue-status signals indicating whether or not transmittable packet data exists in the corresponding one of the queues, a bandwidth controller outputs token-status signals indicating whether or not an amount of the tokens accumulated at a certain period for the corresponding queue is larger than a token threshold provided for the corresponding queue, a queue selector preferentially selects any queue whose duration time of a transmittable state in which the corresponding queue status signal indicates that transmittable packet data exists in the corresponding queue and the corresponding token-status signal indicates that the amount of the accumulated tokens is larger than the token threshold provided for the corresponding queue is greater than a duration-time threshold provided for the corresponding queue, and a buffer reader controls reading of the packet data from the selected queue.Type: ApplicationFiled: July 23, 2012Publication date: January 31, 2013Applicant: FUJITSU LIMITEDInventors: Akihiro HATA, Atsushi KITADA, Yuji IKEGAMI
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Publication number: 20110286879Abstract: As a stainless steel for a metal part for clothing ornament capable of working into a complicated form part and having such nonmagnetic properties that the worked part can cope with the detection through needle detecting device is provided a high-Mn austenitic stainless steel having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.03 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass %, provided that these components are contained so that ? cal (mass %) represented by the following equation (1) is not more than 5.5 mass %: ? cal (mass %)=(Cr+0.48Si+1.21Mo+2.2(V+Ti)+0.15Nb)?(Ni+0.47Cu+0.11Mn?0.0101Mn2+26.4C+20.1N)?4.7??(1) and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.Type: ApplicationFiled: February 26, 2010Publication date: November 24, 2011Applicant: NIPPON YAKIN KOGYO CO., LTD.Inventors: Shigeru Hirata, Yuji Ikegami, Kazuhiro Yamakawa
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Patent number: 6741391Abstract: There is provided a three-dimensional object observing microscope which can easily observe a three-dimensional object in a three-dimensional manner. A three-dimensional object observing microscope comprising a table on which a three-dimensional object is placed, an imaging part which consists of an imaging lens and an imaging camera for imaging this three-dimensional object from an inclined upper position, and a casing which supports the imaging part rotatably in a horizontal direction and also integrally supports the table and the imaging part.Type: GrantFiled: May 1, 2000Date of Patent: May 25, 2004Assignee: Sony CorporationInventors: Eiji Ishihara, Shinsuke Hiraoka, Yuji Ikegami, Takashi Mizusawa, Tozaburo Nishimura
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Patent number: 6483118Abstract: The present invention provides a positron source essentially consisting of a carbon member having 18F bound onto the surface thereof, a method of a preparing the same, and an automated system for supplying the same. In the present invention, the positron source is prepared by irradiating a solution 35 containing both H218O and a small amount of natural fluorine ions with a beam of charged particles to generate 18F, and then passing an electric current through the solution 35 using a carbon member 40 as an anode to cause to bind the generated 18F onto the surface of the carbon member 40.Type: GrantFiled: July 19, 2001Date of Patent: November 19, 2002Assignee: RikenInventors: Ichiro Fujiwara, Yoshiko Ito, Ren Iwata, Toshio Hyodo, Yasushige Yano, Akira Goto, Yuji Ikegami, Yoshio Nomiya
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Publication number: 20010040223Abstract: The present invention provides a positron source essentially consisting of a carbon member having 18F bound onto the surface thereof, a method of preparing the same, and an automated system for supplying the same. In the present invention, the positron source is prepared by irradiating a solution 35 containing both H218O and a small amount of natural fluorine ions with a beam of charged particles to generate 18F, and then passing an electric current through the solution 35 using a carbon member 40 as an anode to cause to bind the generated 18F onto the surface of the carbon member 40.Type: ApplicationFiled: July 19, 2001Publication date: November 15, 2001Inventors: Ichiro Fujiwara, Yoshiko Ito, Ren Iwata, Toshio Hyodo, Yasushige Yano, Akira Goto, Yuji Ikegami, Yoshio Nomiya
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Patent number: 6289071Abstract: The present invention provides a positron source essentially consisting of a carbon member having 18F bound onto the surface thereof, a method of preparing the same, and an automated system for supplying the same. In the present invention, the positron source is prepared by irradiating a solution containing both H218O and a small amount of natural fluorine ions with a beam of charged particles to generate 18F, and then passing an electric current through the solution using a carbon member 40 as an anode to cause to bind the generated 18F onto the surface of the carbon member.Type: GrantFiled: September 1, 1999Date of Patent: September 11, 2001Assignee: RikenInventors: Ichiro Fujiwara, Yoshiko Ito, Ren Iwata, Toshio Hyodo, Yasushige Yano, Akira Goto, Yuji Ikegami, Yoshio Nomiya
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Patent number: 5686044Abstract: An austenitic stainless steel for press forming has considerably excellent deep drawability and bulging property as compared with those of the conventional one, which comprises C: 0.01-0.10 wt %, Si: not more than 1.0 wt %, Mn: not more than 3.0 wt %, Ni: 6.0-10.0 wt %, Cr: 15.0-19.0 wt %, Cu: 1.0-4.0 wt %, Al: 0.2-2.5 wt %, N: not more than 0.05 wt %, and if necessary, Mo: 0.03-3.0 wt % and B: 0.0010-0.020 wt %, and is adjusted to satisfy anyone of Ni equivalent: 21.0-23.0, crystal grain size number (N) of not less than 8, cleanness of 0.020%, low Si content and (C+N) amount .gtoreq.0.04.Type: GrantFiled: March 25, 1996Date of Patent: November 11, 1997Assignee: Nippon Yakin Kogyo Co., Ltd.Inventors: Yuji Ikegami, Qinzhong Zhang
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Patent number: 5480608Abstract: A ferritic stainless steel having excellent oxidation resistance, toughness and hot workability contains 0.001-0.20% of at least one of Ca, Mg and Ba as an amount of [Ca]+[Mg]+1/5[Ba], and La: 0.06-0.5% and Ce: 0.002-0.050% in addition to C, Si, Mn, Ni, Cr, Al, Ti and N as a main component provided that these components satisfy relations of the following equations (1)-(3):[S].ltoreq.[Ca]+[Mg]+1/5[Ba] (1)[La]/[Ce].gtoreq.5 (2)Ti.gtoreq.Type: GrantFiled: December 13, 1994Date of Patent: January 2, 1996Assignee: Nippon Yakin Kogyo Co., Ltd.Inventors: Masaomi Tsuda, Yoshito Fujiwara, Yuji Ikegami, Masao Sato, Hiroyuki Fujii
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Patent number: 5303117Abstract: An electrostatic positioner with one or more first electrodes for producing forces to confine a charged specimen in the direction perpendicular to a center axis and second electrodes for producing forces to confine the charged specimen in the direction of the center axis.Type: GrantFiled: June 9, 1993Date of Patent: April 12, 1994Assignee: Ishikawajima-Harima Jukogyo Kabushiki KaishaInventors: Masaaki Ogihara, Michio Aoyama, Tsumoru Fujii, Yuji Ikegami, Joji Shinohara