Patents by Inventor Takuji Ogawa
Takuji Ogawa 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: 8468300Abstract: The storage system includes a first controller adapted to transfer/receive data to/from a host computer and to receive/transfer data from/to first type drive units via a first type interface of the first controller; a second controller adapted to transfer/receive data to/from the host computer and/or another host computer and to receive/transfer data from/to the first type drive units via a first type interface of the second controller, the first type drive units each having a converter and a first type drive, the converter converting between a first type protocol and a second type protocol, the first type drive having a second type interface and storing data converted to the second type protocol by the converter; and an expansion housing including the first type drive units. Each of the first type drive units are coupled to both the first and second controllers.Type: GrantFiled: December 9, 2010Date of Patent: June 18, 2013Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 8320154Abstract: A micro-switching element provided with a first electrode 4 containing an ionic conductor and a second electrode 5 composed of an electric conductor, wherein the first electrode 4 and the second electrode 5 are physically and electrically connected to each other through deposition of a metal ion from the ionic conductor, and wherein a photoresponsive film 9 that receives light to generate a carrier is disposed between the first electrode 4 and the second electrode 5 to fill up the space between the electrodes. Accordingly, a micro-switching element is provided of which the characteristic fluctuation is small and which hardly produces a problem of operation failure.Type: GrantFiled: August 8, 2008Date of Patent: November 27, 2012Assignee: National Institute for Materials ScienceInventors: Tsuyoshi Hasegawa, Masakazu Aono, Fumiko Yano, Kazuya Terabe, Toru Tsuruoka, Tomoko Ebihara, Takuji Ogawa, Hirofumi Tanaka, Takami Hino
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Patent number: 8291162Abstract: One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.Type: GrantFiled: September 16, 2011Date of Patent: October 16, 2012Assignee: Hitachi, Ltd.Inventors: Manabu Kitamura, Junji Ogawa, Shunji Kawamura, Takao Sato, Naoto Matsunami, Shintaro Ito, Tomohiro Yoshihara, Takuji Ogawa
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Publication number: 20120011396Abstract: One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.Type: ApplicationFiled: September 16, 2011Publication date: January 12, 2012Inventors: Manabu KITAMURA, Junji Ogawa, Shunji Kawamura, Takao Sato, Naoto Matsunami, Shintaro Ito, Tomohiro Yoshihara, Takuji Ogawa
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Publication number: 20110273920Abstract: A micro-switching element provided with a first electrode 4 containing an ionic conductor and a second electrode 5 composed of an electric conductor, wherein the first electrode 4 and the second electrode 5 are physically and electrically connected to each other through deposition of a metal ion from the ionic conductor, and wherein a photoresponsive film 9 that receives light to generate a carrier is disposed between the first electrode 4 and the second electrode 5 to fill up the space between the electrodes. Accordingly, a micro-switching element is provided of which the characteristic fluctuation is small and which hardly produces a problem of operation failure.Type: ApplicationFiled: August 8, 2008Publication date: November 10, 2011Inventors: Tsuyoshi Hasegawa, Masakazu Aono, Fumiko Yano, Kazuya Terabe, Toru Tsuruoka, Tomoko Ebihara, Takuji Ogawa, Hirofumi Tanaka, Takami Hino
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Patent number: 8037245Abstract: One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.Type: GrantFiled: February 6, 2008Date of Patent: October 11, 2011Assignee: Hitachi, Ltd.Inventors: Manabu Kitamura, Junji Ogawa, Shunji Kawamura, Takao Sato, Naoto Matsunami, Shintaro Ito, Tomohiro Yoshihara, Takuji Ogawa
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Publication number: 20110082975Abstract: The disk array system includes a first controller adapted to transfer/receive data to/from a host computer and to receive/transfer data from/to first type disk drive units via a first type interface of the first controller; a second controller adapted to transfer/receive data to/from the host computer and/or another host computer and to receive/transfer data from/to the first type disk drive units via a first type interface of the second controller, the first type disk drive units each having a converter and a first type disk drive, the converter converting between a first type protocol and a second type protocol, the first type disk drive having a second type interface and storing data converted to the second type protocol by the converter; and an expansion housing including the first type disk drive units. Each of the first type disk drive units are coupled to both the first and second controllers.Type: ApplicationFiled: December 9, 2010Publication date: April 7, 2011Applicant: HITACHI, LTD.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 7875352Abstract: A stabilized inorganic nanoparticle which is stabilized by bonding protective ligands to a surface of an inorganic nanoparticle, wherein one part of binding sites on the surface of the inorganic nanoparticle are bonded to the protective ligand, the other part of the binding sites remain as a free site not bonded to the protective ligand, and satisfies the condition that the amount of the protective ligand bonded to the inorganic nanoparticle is a critical amount or the condition that the form of modifying the surface of the inorganic nanoparticle by the protective ligand is a critical modification form. According to the present invention, there is provided a stabilized inorganic nanoparticle that is stabilized by a protective ligand and can be rapidly functionalized with ease by bonding a functional ligand thereto.Type: GrantFiled: November 21, 2005Date of Patent: January 25, 2011Assignee: Japan Science and Technology AgencyInventors: Koiti Araki, Takuji Ogawa, Eisuke Mizuguchi
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Patent number: 7865665Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: December 30, 2004Date of Patent: January 4, 2011Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Publication number: 20090106585Abstract: One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.Type: ApplicationFiled: February 6, 2008Publication date: April 23, 2009Inventors: Manabu Kitamura, Junji Ogawa, Shunji Kawamura, Takao Sato, Naoto Matsunami, Shintaro Ito, Tomohiro Yoshihara, Takuji Ogawa
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Patent number: 7453774Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: December 30, 2004Date of Patent: November 18, 2008Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 7447121Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: March 20, 2007Date of Patent: November 4, 2008Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Publication number: 20080268249Abstract: A stabilized inorganic nanoparticle which is stabilized by bonding protective ligands to a surface of an inorganic nanoparticle, wherein one part of binding sites on the surface of the inorganic nanoparticle are bonded to the protective ligand, the other part of the binding sites remain as a free site not bonded to the protective ligand, and satisfies the condition that the amount of the protective ligand bonded to the inorganic nanoparticle is a critical amount or the condition that the form of modifying the surface of the inorganic nanoparticle by the protective ligand is a critical modification form. According to the present invention, there is provided a stabilized inorganic nanoparticle that is stabilized by a protective ligand and can be rapidly functionalized with ease by bonding a functional ligand thereto.Type: ApplicationFiled: November 21, 2005Publication date: October 30, 2008Inventors: Koiti Araki, Takuji Ogawa, Eisuke Mizuguchi
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Publication number: 20070192539Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: ApplicationFiled: March 20, 2007Publication date: August 16, 2007Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 7203135Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: December 30, 2004Date of Patent: April 10, 2007Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 7200074Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: December 30, 2004Date of Patent: April 3, 2007Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Patent number: 7181570Abstract: A diskarray system has a diskarray controller and a plurality of disk devices. Each of the disk devices has a media, a head, and a head position controller. The diskarray controller performs online data check operation, and stops the online data check operation over the disk device at first predetermined timing. After stopping the online data check operation, the diskarray controller issues an unload enable command to the disk device so as to move the head to a position different from positions at which the head reads or writes data from or to the media. The head position controller of the disk device moves the position of the head on the basis of the received unload enable command.Type: GrantFiled: August 25, 2004Date of Patent: February 20, 2007Assignee: Hitachi, Ltd.Inventors: Ikuya Yagisawa, Takuji Ogawa, Kenichi Takamoto, Yoshinori Tsuneda, Azuma Kano
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Patent number: 7057981Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: GrantFiled: January 29, 2004Date of Patent: June 6, 2006Assignee: Hitachi, Ltd.Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa
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Publication number: 20050268034Abstract: A diskarray system has a diskarray controller and a plurality of disk devices. Each of the disk devices has a media, a head, and a head position controller. The diskarray controller performs online data check operation, and stops the online data check operation over the disk device at first predetermined timing. After stopping the online data check operation, the diskarray controller issues an unload enable command to the disk device so as to move the head to a position different from positions at which the head reads or writes data from or to the media. The head position controller of the disk device moves the position of the head on the basis of the received unload enable command.Type: ApplicationFiled: August 25, 2004Publication date: December 1, 2005Inventors: Ikuya Yagisawa, Takuji Ogawa, Kenichi Takamoto, Yoshinori Tsuneda, Azuma Kano
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Publication number: 20050154942Abstract: A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.Type: ApplicationFiled: December 30, 2004Publication date: July 14, 2005Inventors: Azuma Kano, Takuji Ogawa, Ikuya Yagisawa