Patents by Inventor Ja-choon Koo
Ja-choon Koo 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: 20100307900Abstract: Disclosed is an active skin including: a tactile sensor substrate which includes a first film including a dielectric elastic material and formed with a plurality of sensing points, and a pair of first electrodes respectively formed on upper and lower sides of the sensing point; a tactile actuator substrate which includes a second film including a dielectric elastic material and formed with a plurality of actuating points, and a pair of second electrodes respectively formed on upper and lower sides of the actuating point; and an insulating layer which is interposed between the tactile sensor substrate and the tactile actuator substrate and couples the tactile sensor substrate and the tactile actuator substrate. With this, a tactile sensor and a tactile actuator are integrated, so that there is provided an interactive tactile interface to not only feel like a human's skin but also actively move like a muscle.Type: ApplicationFiled: June 1, 2010Publication date: December 9, 2010Applicant: Sungkyunkwan University Foundation for Corporate CollaborationInventors: Hyouk-Ryeol Choi, Hyung-Pil Moon, Ja-Choon Koo, Se-Gon Roh
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Publication number: 20100201227Abstract: Provided are a polymer and a polymer actuator including the polymer. The polymer is cross-linked by a cross-linking agent. When the polymer is used in the polymer actuator, the polymer actuator shows a high strain and may be stably operated at high temperatures.Type: ApplicationFiled: February 12, 2010Publication date: August 12, 2010Applicants: SAMSUNG ELECTRONICS CO., LTD., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Seung-tae CHOI, Young-kwan LEE, Ja-Choon KOO, Jong-oh KWON, Su-jin PARK
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Publication number: 20100148635Abstract: A solid electrolyte polymer including a cross-linked polyvinylidene fluoride (PVDF)-based polymer, and a polymer actuator including the cross-linked PVDF-based polymer and an electrolytic material.Type: ApplicationFiled: December 8, 2009Publication date: June 17, 2010Applicants: Samsung Electronics Co., Ltd., Sungkyunkwan University Foundation for Corporate CollaborationInventors: Jong-oh Kwon, Seung-tae Choi, Young-kwan Lee, Ja-Choon Koo, Su-jin Park
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Publication number: 20100132175Abstract: The present invention provides an electroactive solid-state actuator, including a solid polymer electrolyte film having first and second main surfaces facing each other, and first and second conductive polymer layers infiltrated into the first and second main surfaces of the solid polymer electrolyte film. Further, a method of manufacturing the electroactive solid-state actuator is provided, the method including preparing a solid polymer film having first and second main surfaces facing each other, infiltrating a monomer of a conductive polymer into the first and second main surfaces of the solid polymer film, followed by polymerization, to form first and second conductive polymer layers, and immersing the solid polymer film into an ionic liquid or liquid electrolyte to be converted to an electrically conductive polymer.Type: ApplicationFiled: January 20, 2010Publication date: June 3, 2010Applicants: SAMSUNG ELECTRO-MECHANICS CO. LTD., SUNGKYUNKWAN UNIVERSITYInventors: Kwi Jong Lee, Young Kwan Lee, Jae Do Nam, Hyouk Ryeol Choi, Mi Suk Cho, Ja Choon Koo
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Patent number: 7728193Abstract: The present invention relates to a novel protein interacting with phytochromes and use thereof, and more particularly, to a polypeptide having either an amino acid sequence set forth in SEQ ID NO: 4 or an amino acid sequence having at least 70% with said amino acid sequence, and use thereof. The polypeptide interacts with phytochromes A and B, and the TPR domain present at the N-terminal region of the polypeptide is involved in the interaction. Also, a PP2A catalytic domain (PP2Ac) having phosphatase activity is present at the C-terminal region of the polypeptide. The polypeptide can be used as a phosphatase, and is useful in the production of plants sensitive to light signal transduction. Furthermore, the TPR domain present in the polypeptide is useful in the production of dwarf plants.Type: GrantFiled: February 28, 2005Date of Patent: June 1, 2010Assignees: Genomine Inc., Postech FoundationInventors: Hong-Gil Nam, Jong-Sang Ryu, Pyung-Ok Lim, Ja-Choon Koo
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Patent number: 7682314Abstract: A blood pressure meter using a viscoelastic cuff, and a mobile terminal having the blood pressure meter. The blood pressure meter includes a blood pressure sensor for measuring variation in blood pressure, a blood flow sensor for measuring variation in blood flow, a cuff that elastically compresses a body part and decompresses the body part due to its viscoelasticity, and a control unit that analyzes signals measured by the blood pressure sensor and the blood flow sensor and calculates blood pressure. The blood pressure meter is detachably connected to a mobile terminal body, and can be small and portable. It is possible to measure the blood pressure precisely even when the cuff is fitted onto a finger, thereby improving the reliability of the blood pressure measurement. By using the viscoelasticity of the cuff and auxiliary decompressing, it is possible to check the blood pressure at all times.Type: GrantFiled: April 25, 2006Date of Patent: March 23, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Sang-hoon Shin, Hyouk-ryeol Choi, Ja-choon Koo, Kyung-ho Kim, Ki-wang Kim
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Patent number: 7677805Abstract: A fluid dynamic bearing is constructed to support stably a rotating body to which a non-uniform force is applied, and a hard disk drive (HDD) employing the fluid dynamic bearing is provided. The fluid dynamic bearing includes a journal bearing part supporting a rotary shaft in a radial direction of the rotary shaft, a thrust part formed at one end of the rotary shaft, a thrust bearing part facing the thrust part and supporting the rotary shaft in a longitudinal direction of the rotary shaft, and a plurality of grooves formed on a surface of the thrust bearing part and/or the thrust part. The plurality of grooves include a first groove group including a plurality of grooves having the same shape and arrangement, and a second groove group adjacent to the first groove group and including at least one groove asymmetric with respect to the grooves of the first groove group.Type: GrantFiled: October 21, 2005Date of Patent: March 16, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyuk Han, Dong-ho Oh, Yong-kyu Byun, Cheol-soon Kim, Jeong-seok Koh, Nam-hoon Lee, Ja-choon Koo
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Publication number: 20100053805Abstract: A method of manufacturing a hard disk drive includes measuring an imbalance value including an imbalance position with respect to a rotation center of a rotation shaft of the hub, with respect to each of a plurality of disks installed on a hub of a spindle motor to rotate the disks, allowing different imbalance positions of the disks to approach each other in a circumferential direction by applying an impact to the hard disk drive, and correcting the imbalance value by applying an impact to the hard disk drive in a direction opposite to the imbalance positions of the disks approaching each other with respect to the rotation shaft of the hub, to move the imbalance positions of the disks approaching each other in a radial direction of the disks with respect to the rotation center of the rotation shaft of the hub.Type: ApplicationFiled: August 26, 2009Publication date: March 4, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Dongho Oh, Ha Yong Kim, Ja Choon Koo, Kyoung Ho Kim, Byoung Choul Choi
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Patent number: 7671514Abstract: The present invention provides an electroactive solid-state actuator, including a solid polymer electrolyte film having first and second main surfaces facing each other, and first and second conductive polymer layers infiltrated into the first and second main surfaces of the solid polymer electrolyte film. Further, a method of manufacturing the electroactive solid-state actuator is provided, the method including preparing a solid polymer film having first and second main surfaces facing each other, infiltrating a monomer of a conductive polymer into the first and second main surfaces of the solid polymer film, followed by polymerization, to form first and second conductive polymer layers, and immersing the solid polymer film into an ionic liquid or liquid electrolyte to be converted to an electrically conductive polymer.Type: GrantFiled: March 15, 2005Date of Patent: March 2, 2010Assignees: Samsung Electro-Mechanics. Co. Ltd, Sungkyunkwan UniversityInventors: Kwi Jong Lee, Young Kwan Lee, Jae Do Nam, Hyouk Ryeol Choi, Mi Suk Cho, Ja Choon Koo
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Publication number: 20090164145Abstract: A test stand is disclosed for estimating the dynamics of a Fluid Dynamic Bearing (FDB) coupling a spindle motor to a rotating hub. The hub includes an air target and displacement plate. At least one air jet strikes the air target, and at least one displacement sensor engages the displacement plate to create a displacement reading. The displacement reading(s) are analyzed to estimate the dynamics of the FDB. The estimates may include but is not limited to the stiffness and/or damping of the FDB.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Inventors: Ja Choon Koo, Myeong-Eop Kim, Anh Hoang
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Patent number: 7499244Abstract: A disk holder for an off-line servo-track writer is installed at a driving motor of the off-line servo-track writer in a state in which a plurality of disks for information storage are assembled to the disk holder. The disk holder has a flange for supporting the plurality of disks, a mounting portion to be joined to the driving motor is provided at one side of the flange, and a hub is provided at the other side of the flange. A space into which air flows is formed in the hub, and the plurality of disks and a plurality of spacers for maintaining a gap between the plurality of disks are assembled around the outer circumference of the hub. A plurality of pressing members are installed at the hub to move back and forth in a radial direction of the hub.Type: GrantFiled: January 30, 2006Date of Patent: March 3, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Dong-ho Oh, Jae-hyuk Han, Yong-kyu Byun, Ja-choon Koo
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Publication number: 20090035181Abstract: A clinical test apparatus employing a mobile robot is provided. The clinical test apparatus includes a stage unit, a test station provided in the stage unit and configured to perform a clinical test, a mobile robot configured to move on a top surface of the stage unit and to transfer a plate on which samples and reagents are loaded to the test station, and a docking unit disposed in the stage unit and configured to reset a position of the mobile robot. A variety of test stations for a clinical test can be integrated, and multiple tests can be performed at the same time through a plurality of mobile robots.Type: ApplicationFiled: July 13, 2007Publication date: February 5, 2009Applicant: Postech Academy-Industry FoundationInventors: Wan Kyun Chung, Hyouk Ryeol Choi, Sung Moo Ryu, Min Chul Kim, Ja Choon Koo
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Patent number: 7474501Abstract: A spindle motor, which rotates a plurality of data storage disks in a hard disk drive, the spindle motor including: a shaft; an inner hub rotatably installed on an outer periphery of the shaft; and a hub assembly, which includes: an outer hub detachably coupled to an outer periphery of the inner hub, the outer hub shaped such that a plurality of disks and at least one spacer for maintaining an interval between adjacent disks of the plurality of disks can be secured to an outer periphery of the outer hub; and a fastening member coupled to a top portion of the outer hub and fixing the outer hub to the inner hub. The outer hub assembly to which the plurality of disks are secured can be mounted on an off-line servo-track writer, and can also be attached as is to the spindle motor after servo-track writing is completed.Type: GrantFiled: June 23, 2005Date of Patent: January 6, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Dong-ho Oh, Ja-choon Koo, Yong-kyu Byun, Jae-hyuk Han
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Publication number: 20080235826Abstract: The present invention relates to a novel protein interacting with phytochromes and use thereof, and more particularly, to a polypeptide having either an amino acid sequence set forth in SEQ ID NO: 4 or an amino acid sequence having at least 70% with said amino acid sequence, and use thereof. The polypeptide interacts with phytochromes A and B, and the TPR domain present at the N-terminal region of the polypeptide is involved in the interaction. Also, a PP2A catalytic domain (PP2Ac) having phosphatase activity is present at the C-terminal region of the polypeptide. The polypeptide can be used as a phosphatase, and is useful in the production of plants sensitive to light signal transduction. Furthermore, the TPR domain present in the polypeptide is useful in the production of dwarf plants.Type: ApplicationFiled: February 28, 2005Publication date: September 25, 2008Applicants: Genomine Inc., Poatech FoundationInventors: Hong-Gil Nam, Jong-Sang Ryu, Pyung-Ok Lim, Ja-Choon Koo
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Publication number: 20060253041Abstract: A blood pressure meter using a viscoelastic cuff, and a mobile terminal having the blood pressure meter. The blood pressure meter includes a blood pressure sensor for measuring variation in blood pressure, a blood flow sensor for measuring variation in blood flow, a cuff that elastically compresses a body part and decompresses the body part due to its viscoelasticity, and a control unit that analyzes signals measured by the blood pressure sensor and the blood flow sensor and calculates blood pressure. The blood pressure meter is detachably connected to a mobile terminal body, and can be small and portable. It is possible to measure the blood pressure precisely even when the cuff is fitted onto a finger, thereby improving the reliability of the blood pressure measurement. By using the viscoelasticity of the cuff and auxiliary decompressing, it is possible to check the blood pressure at all times.Type: ApplicationFiled: April 25, 2006Publication date: November 9, 2006Inventors: Sang-hoon Shin, Hyouk-ryeol Choi, Ja-choon Koo, Kyung-ho Kim, Ki-wang Kim
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Publication number: 20060171066Abstract: A disk holder for an off-line servo-track writer is installed at a driving motor of the off-line servo-track writer in a state in which a plurality of disks for information storage are assembled to the disk holder. The disk holder has a flange for supporting the plurality of disks, a mounting portion to be joined to the driving motor is provided at one side of the flange, and a hub is provided at the other side of the flange. A space into which air flows is formed in the hub, and the plurality of disks and a plurality of spacers for maintaining a gap between the plurality of disks are assembled around the outer circumference of the hub. A plurality of pressing members are installed at the hub to move back and forth in a radial direction of the hub.Type: ApplicationFiled: January 30, 2006Publication date: August 3, 2006Inventors: Dong-ho Oh, Jae-hyuk Han, Yong-kyu Byun, Ja-choon Koo
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Publication number: 20060093245Abstract: A fluid dynamic bearing is constructed to support stably a rotating body to which a non-uniform force is applied, and a hard disk drive (HDD) employing the fluid dynamic bearing is provided. The fluid dynamic bearing includes a journal bearing part supporting a rotary shaft in a radial direction of the rotary shaft, a thrust part formed at one end of the rotary shaft, a thrust bearing part facing the thrust part and supporting the rotary shaft in a longitudinal direction of the rotary shaft, and a plurality of grooves formed on a surface of the thrust bearing part and/or the thrust part. The plurality of grooves include a first groove group including a plurality of grooves having the same shape and arrangement, and a second groove group adjacent to the first groove group and including at least one groove asymmetric with respect to the grooves of the first groove group.Type: ApplicationFiled: October 21, 2005Publication date: May 4, 2006Inventors: Jae-hyuk Han, Dong-ho Oh, Yong-kyu Byun, Cheol-soon Kim, Jeong-seok Koh, Nam-hoon Lee, Ja-choon Koo
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Publication number: 20050286164Abstract: A spindle motor, which rotates a plurality of data storage disks in a hard disk drive, the spindle motor including: a shaft; an inner hub rotatably installed on an outer periphery of the shaft; and a hub assembly, which includes: an outer hub detachably coupled to an outer periphery of the inner hub, the outer hub shaped such that a plurality of disks and at least one spacer for maintaining an interval between adjacent disks of the plurality of disks can be secured to an outer periphery of the outer hub; and a fastening member coupled to a top portion of the outer hub and fixing the outer hub to the inner hub. The outer hub assembly to which the plurality of disks are secured can be mounted on an off-line servo-track writer, and can also be attached as is to the spindle motor after servo-track writing is completed.Type: ApplicationFiled: June 23, 2005Publication date: December 29, 2005Inventors: Dong-ho Oh, Ja-choon Koo, Yong-kyu Byun, Jae-hyuk Han
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Patent number: 5979249Abstract: An actuator resonance tester is provided for testing the resonance of an actuator arm in a hard disk drive device. The tester includes an actuator arm, a pivot, one or more weights, a voice coil, a voice coil motor, an accelerometer, and a processor. The one or more weights are formed on the actuator arm to simulate the mass of at least one read/write head. The base and the test housing are affixed to either end of the pivot to provide it with proper boundary conditions to simulate the boundary conditions of a fully-assembled hard disk drive device. The voice coil and the voice coil motor move the actuator arm rotationally around the pivot. The accelerometer is placed on the actuator arm to measure the horizontal acceleration of the actuator arm. The processor determines the resonance of the actuator arm based on the arm's measured horizontal acceleration. In this way, the resonance of the actuator arm can be tested without the need to construct the entire hard disk drive device.Type: GrantFiled: June 9, 1998Date of Patent: November 9, 1999Assignee: Samsung Electronics Co., Ltd.Inventors: Ja Choon Koo, Tu Nguyen, Wilson Long