Patents by Inventor Atsushi Kawamura
Atsushi Kawamura 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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Publication number: 20160371145Abstract: A first node group including at least three nodes is predefined in a distributed storage system. Each node of the first node group is configured to send data blocks stored in storage devices managed by the node to other nodes belonging to the first node group. A first node is configured to receive data blocks from two or more other nodes in the first node group. The first node is configured to create a redundant code using a combination of data blocks received from the two or more other nodes and store the created redundant code to a storage device different from storage devices holding the data blocks used to create the redundant code. Combinations of data blocks used to create at least two redundant codes in redundant codes created by the first node are different in combination of logical addresses of constituent data blocks.Type: ApplicationFiled: September 30, 2015Publication date: December 22, 2016Inventors: Hiroaki AKUTSU, Shunji KAWAMURA, Kota YASUNAGA, Takahiro YAMAMOTO, Atsushi KAWAMURA
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Publication number: 20160351905Abstract: A high-capacity nonaqueous electrolyte secondary battery having good load characteristics is provided. The nonaqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material, a negative electrode, and a nonaqueous electrolyte. The positive electrode contains the active material composed of a lithium transition metal oxide and a positive electrode additive composed of an oxide that contains Li and at least two elements other than Li and oxygen and has an antifluorite structure. The nonaqueous electrolyte secondary battery obtained is charged until the potential of the positive electrode is 4.0 V or higher and 4.65 V or lower (vs. Li/Li+).Type: ApplicationFiled: January 20, 2015Publication date: December 1, 2016Applicant: SANYO ELECTRIC CO., LTD.Inventors: Atsushi KAWAMURA, Kazuhiro HASEGAWA, Sho TSURUTA, Atsushi FUKUI
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Publication number: 20160335195Abstract: The present invention provides a storage device adopting a semiconductor device as a storage media having a nonvolatile property and must be erased for writing data, wherein the device divides and manages a logical storage space provided to a higher level device in logical page units, and manages a virtual address space which is a linear address space to which multiple physical blocks of the semiconductor device are mapped. The storage device uses a page mapping table managing a correspondence between a logical page and an address in the virtual address space, and a virtual address configuration information managing a correspondence between an area in the virtual address space and a physical block, in order to manage the correspondence between the respective logical pages and storage areas of the semiconductor device.Type: ApplicationFiled: January 29, 2014Publication date: November 17, 2016Applicant: HITACHI, LTD.Inventors: Atsushi Kawamura, Junji Ogawa
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Publication number: 20160328154Abstract: A storage device provides a logical space based on a storage medium that is configured by a plurality of logical areas to the higher-level apparatus, and a base data range exists in the storage medium for each logical area. The storage device reads the base data from the base data range that is corresponded to a write destination logical area to which the write destination logical address belongs, and creates difference data that is an exclusive OR of first data that is the base data and second data that is any one of data based on write data and the write data. The storage device creates compressed difference data by compressing the difference data, writes the compressed difference data to the storage medium, and associates a difference data range that is a range in which the compressed difference data has been written with the write destination logical area.Type: ApplicationFiled: February 26, 2014Publication date: November 10, 2016Applicant: HITACHI, LTD.Inventors: Nagamasa MIZUSHIMA, Junji OGAWA, Atsushi KAWAMURA
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Patent number: 9479194Abstract: The present invention guarantees throughput for decompressing compressed data. A data compression apparatus includes: a division unit that divides plaintext data inputted to the division unit into a plurality of plaintext blocks each having a prescribed plaintext block length; a compression unit that creates a payload for each plaintext block of the plurality of plaintext blocks by compressing the plaintext block using a sliding dictionary-type compression algorithm, creates a header indicating the length of the payload, and creates a compression block that includes the header and the payload; and a concatenation unit that creates compressed data by concatenating a plurality of compression blocks created from the plurality of plaintext blocks.Type: GrantFiled: August 9, 2013Date of Patent: October 25, 2016Assignee: HITACHI, LTD.Inventors: Nagamasa Mizushima, Hideyuki Koseki, Atsushi Kawamura
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Patent number: 9458557Abstract: There is provided a dry-wet spinning device for an acrylic precursor fiber bundle for manufacturing carbon fibers, the device enabling stable spinning by making the coagulability of spun yarn (2) uniform by suppressing the vibration of the coagulating liquid surface to make the spun yarn (2) spun downward from a spinneret (1) without the liquid surface being in contact with the spinning surface of the spinneret less susceptible to an accompanying flow reflected by the bottom surface of a spinning bath. To this end, in the present invention, a horizontal flow straightening plate (8) produced from a porous plate or a plate material extending in the direction approximately perpendicular to the direction in which the spun yarn (2) is spun is disposed in a coagulation bath so as to surround the circumference of the yarn spun downward from the spinneret (1).Type: GrantFiled: September 24, 2012Date of Patent: October 4, 2016Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Hiromasa Inada, Tomotaka Yoshimori, Hiroshi Hashimoto, Atsushi Kawamura, Kazuma Okumura
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Publication number: 20160233880Abstract: The present invention guarantees throughput for decompressing compressed data. A data compression apparatus includes: a division unit that divides plaintext data inputted to the division unit into a plurality of plaintext blocks each having a prescribed plaintext block length; a compression unit that creates a payload for each plaintext block of the plurality of plaintext blocks by compressing the plaintext block using a sliding dictionary-type compression algorithm, creates a header indicating the length of the payload, and creates a compression block that includes the header and the payload; and a concatenation unit that creates compressed data by concatenating a plurality of compression blocks created from the plurality of plaintext blocks.Type: ApplicationFiled: August 9, 2013Publication date: August 11, 2016Applicant: HITACHI, LTD.Inventors: Nagamasa MIZUSHIMA, Hideyuki KOSEKI, Atsushi KAWAMURA
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Publication number: 20160160395Abstract: The nozzle body of the gas supply blowout nozzle (11) includes an inclined plate (13) guiding a gas flowing straightly from a gas inlet port to a rectification board (12), which is connected with the nozzle body. The rectification board (12) rectifies the flow of the gas guided by the inclined plate (13) so that the gas blows out perpendicular or parallel to a yarn from a gas outlet port. A gas guiding zone formed between the inclined plate (13) and the rectification board (12) includes one or more guide plates (14) which divide the gas supplied from the gas inlet port (11a) of the gas supply blowout nozzle (11) into two or more streams. In each gas passage formed at least one of between the inclined plate (13) and the guide plate (14) or between the guide plates (14), an upstream passage width W1 and any downstream passage width W2 thereof satisfy the relation of W1?W2.Type: ApplicationFiled: July 23, 2014Publication date: June 9, 2016Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Risa ARAI, Satoshi KAJI, Atsushi KAWAMURA
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Patent number: 9343153Abstract: Data capacity efficiency is improved by de-duplicating data assigned with a code that is different for each data. A storage apparatus comprising a flash memory control device equipped with one or more flash memory modules, wherein the flash memory module comprises at least one flash memory chip for providing a storage area, and a controller for controlling writing/reading of data including user data and a guarantee code accompanying the user data to and from the storage area provided by the flash memory chip, wherein the controller respectively divides a plurality of the data having the common user data into the user data and the guarantee code, stores one of the user data in an area of a predetermined unit of the storage area, and links and stores each of the guarantee codes accompanying the plurality of user data in an area of a predetermined unit of the storage area.Type: GrantFiled: July 14, 2015Date of Patent: May 17, 2016Assignee: HITACHI, LTD.Inventors: Atsushi Kawamura, Junji Ogawa
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Patent number: 9260270Abstract: The invention provides a packaged tow being characterized in that a carbon fiber precursor tow having a flattened shape in cross section and having a first surface and a second surface opposite to the first surface is layered and packaged in a packaging container in untwisted state. A front end and a back end of the carbon fiber precursor tow thus packaged are placed on a top of the fully-packaged carbon fiber precursor tow. When the front end and a back end of the tow are respectively applied with top/bottom surface identification means to identify top and bottom surfaces thereof, top and bottom surfaces on front ends and back ends of tows packaged in a plurality of packaging containers can be correctly identified and joined. As a result, thread breakage due to heat accumulation in twisted parts in a flame proofing process can be prevented from happening.Type: GrantFiled: August 6, 2010Date of Patent: February 16, 2016Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Katsuhiko Ikeda, Atsushi Kawamura, Hiromasa Inada
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Publication number: 20160011938Abstract: In a storage apparatus including a storage medium including a plurality of pages as a unit of reading and writing data, a first data block including a data block received from a higher-level device is generated, a second data block of a predetermined size including one or more undivided first data blocks is generated, a third data block in which a correction code is added to the second data block is generated, the third data block is stored in a page buffer, and one or more of the third data blocks stored in the page buffer is written in a page, which is a write destination, out of the pages of the storage medium.Type: ApplicationFiled: August 30, 2013Publication date: January 14, 2016Applicant: Hitachi, Ltd.Inventors: Hideyuki KOSEKI, Takashi TSUNEHIRO, Junji OGAWA, Nagamasa MIZUSHIMA, Atsushi KAWAMURA
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Publication number: 20160002828Abstract: To perform a flame-resistant treatment on a precursor fiber strand by sending hot air to a heat treatment chamber (2) through a hot air blowing nozzle (4) in a direction parallel to a running direction of a precursor fiber strand (10). The hot air blowing from the hot air blowing nozzle (4) passes through a porous plate and a rectifying member that satisfy the following conditions (1) to (4), wherein the conditions are set as follows: (1) A/B?4.0; (2) 0.15???0.35; (3) 0?B?d?20; and (4) 80% or more of an area of one opening of the porous plate when causing facing surfaces of the porous plate and the rectifying member to overlap each other is included in one opening of the rectifying member, A indicating a hot air passage distance (mm) of the rectifying member, B indicating a horizontal maximum distance (mm) of one opening of the rectifying member, ? indicating a rate of hole area of the porous plate, and d indicating an equivalent diameter (mm) of the porous plate.Type: ApplicationFiled: September 14, 2015Publication date: January 7, 2016Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Satoshi KAJI, Nobuyuki YAMAMOTO, Atsushi KAWAMURA, Hitoshi TOMOBE
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Publication number: 20150378816Abstract: A control device stores information associating each of a plurality of physical areas with a plurality of logical areas. The control device respectively stores a plurality of first user data included in a first stripe and a first parity data created on the basis thereof in each of the plurality of physical areas, and, in accordance with receiving a write request for updated user data that updates the user data, which is stored in a first physical area, for a first logical area associated with the first physical area, creates a second parity data on the basis of a data group formed using the updated user data and a plurality of second user data that differs from the plurality of first user data.Type: ApplicationFiled: October 11, 2013Publication date: December 31, 2015Applicant: HITACHI, LTD.Inventors: Atsushi KAWAMURA, Akira YAMAMOTO
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Publication number: 20150378800Abstract: The degree of deterioration of each physical storage area in a non-volatile memory is evaluated without interrupted operation of a storage device. The storage device includes a non-volatile memory configured to include a plurality of physical storage areas and a controller. The controller calculates the degree of deterioration of each of a plurality of specific physical storage areas by performing an evaluation process of evaluating the plurality of specific physical storage areas part by part over all of the plurality of specific physical storage areas and determines whether to use the corresponding physical storage areas based on the calculated degree of deterioration. In the evaluation process, the controller selects a part of the plurality of specific physical storage areas writes predetermined evaluation data on the physical storage area group, reads the evaluation data and calculates the degree of deterioration based on the read evaluation data.Type: ApplicationFiled: March 19, 2013Publication date: December 31, 2015Inventors: Akifumi SUZUKI, Atsushi KAWAMURA
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Publication number: 20150372304Abstract: A nonaqueous electrolyte secondary battery that has high capacity and good load properties. A nonaqueous electrolyte secondary battery includes a positive electrode for a nonaqueous electrolyte secondary battery, a negative electrode, a separator interposed between the positive electrode for a nonaqueous electrolyte secondary battery and the negative electrode, and an electrolyte. The positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, the positive electrode active material layer containing a positive electrode active material and a positive electrode additive. The positive electrode additive contains a Li-containing compound that generates gas at 4.2 V (vs. Li/Li+) or less during first charging of the nonaqueous electrolyte secondary battery.Type: ApplicationFiled: October 4, 2013Publication date: December 24, 2015Applicant: SANYO ELECTRIC CO., LTD.Inventors: Kazuhiro Hasegawa, Atsushi Kawamura, Sho Tsuruta, Atsushi Fukui
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Patent number: 9183136Abstract: A storage control apparatus comprises a storage unit, an association unit, and an execution unit. The storage unit stores association information showing multiple physical chunks which are configured in a physical address space of a nonvolatile semiconductor memory, multiple logical storage areas which are configured in a logical address space of the nonvolatile semiconductor memory, multiple logical chunks which are respectively associated with the multiple physical chunks, and an association between a logical storage area and a logical chunk. The association unit changes the association by changing the association information in accordance with a state of the nonvolatile semiconductor memory, and identifies based on the association information a physical storage area corresponding to a logical storage area specified in an input/output request from a computer. The execution unit executes the input/output request with respect to the identified physical storage area.Type: GrantFiled: May 16, 2012Date of Patent: November 10, 2015Assignee: Hitachi, Ltd.Inventors: Atsushi Kawamura, Junji Ogawa
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Publication number: 20150317097Abstract: Data capacity efficiency is improved by de-duplicating data assigned with a code that is different for each data. A storage apparatus comprising a flash memory control device equipped with one or more flash memory modules, wherein the flash memory module comprises at least one flash memory chip for providing a storage area, and a controller for controlling writing/reading of data including user data and a guarantee code accompanying the user data to and from the storage area provided by the flash memory chip, wherein the controller respectively divides a plurality of the data having the common user data into the user data and the guarantee code, stores one of the user data in an area of a predetermined unit of the storage area, and links and stores each of the guarantee codes accompanying the plurality of user data in an area of a predetermined unit of the storage area.Type: ApplicationFiled: July 14, 2015Publication date: November 5, 2015Applicant: HITACHI, LTD.Inventors: Atsushi KAWAMURA, Junji OGAWA
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Patent number: 9175429Abstract: Provided is a pressure steam treatment apparatus of a fiber bundle and a producing method of a carbon fiber precursor fiber bundle for producing a carbonated precursor fiber bundle to suppress an influence of a leakage of a pressure steam to the outside of the apparatus so as to hold down a pressure steam supply amount to the minimum, simultaneously reduce a broken yarn, improve a yield ratio and have a high productivity. A pressure steam treatment apparatus is provided with labyrinth sealing chambers in back and forth of a pressure steam treatment chamber, and treats a plurality of fiber bundles traveling in parallel like a sheet along a fiber bundle travel path in a lump under a pressure steam atmosphere. The fiber bundle travel path of the labyrinth sealing chamber is divided in parallel to the fiber bundle.Type: GrantFiled: February 9, 2012Date of Patent: November 3, 2015Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Yukihiro Mizutori, Atsushi Kawamura, Hiromasa Inada
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Publication number: 20150299909Abstract: A horizontal heat treatment device continuously subjects an untreated continuous flat object to heat treatment while horizontally transferring the untreated object within a heat treatment chamber. Seal chambers are interconnected to the untreated-object loading opening and treated-object unloading opening of the heat treatment chamber. A passage is connected to an opening of each of the seal chambers, the opening located on the side opposite the heat treatment chamber. The untreated-object passage loading opening interconnected to the untreated-object seal chamber loading opening and the treated-object passage unloading opening interconnected to the treated-object seal chamber unloading opening are the untreated-object loading opening and treated-object unloading opening of the heat treatment device. A pair of gas ejection nozzles are provided at upper and lower positions of the passages. The nozzles eject gas in specific directions, and the nozzle openings have a specific shape, a direction, and a length.Type: ApplicationFiled: February 7, 2013Publication date: October 22, 2015Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Keishi Mizuno, Tetsu Yasunami, Atsushi Kawamura, Youji Hatanaka, Nobuyuki Yamamoto, Hiromasa Inada
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Patent number: 9157679Abstract: A furnace to flame-resistantly treat a precursor fiber strand by sending hot air to a heat treatment chamber through a hot air blowing nozzle in a direction parallel to a running direction of the strand is provided. The hot air passes through a porous plate and a rectifying member satisfying the following conditions: (1) A/B?4.0; (2) 0.15???0.35; (3) 0?B?d?20; and (4) 80% or more of the area of one opening of the porous plate when facing surfaces of the porous plate and the rectifying member overlap is included in one opening of the rectifying member, where A is the rectifying member hot air passage distance (mm), B is a horizontal maximum distance (mm) of one opening of the rectifying member, ? is a rate of hole area of the porous plate, and d is the porous plate equivalent diameter (mm).Type: GrantFiled: July 26, 2012Date of Patent: October 13, 2015Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Satoshi Kaji, Nobuyuki Yamamoto, Atsushi Kawamura, Hitoshi Tomobe