Patents by Inventor Ji-Won Choi
Ji-Won Choi 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: 8199332Abstract: A thickness measurement apparatus includes a beam splitter for reflecting or transmitting a ray irradiated from an optical source or a ray reflected by a measurement object; a first lens part which condenses a ray to the measurement object and generates a reference ray; a second lens part for condensing a ray to the object to be measured; an interference light detector for detecting an interference signal generated by the reflected ray and reference ray; a spectroscopic detector corresponding to the second lens part to form a light path different from the path formed by the interference light detector and splits the ray reflected by the measurement object to detect an intensity and wavelength of each split ray; and a light path converter for selectively transmitting a ray to the interference light detector or spectroscopic detector, wherein position exchanging is performed between the first second lens parts.Type: GrantFiled: April 2, 2008Date of Patent: June 12, 2012Assignee: Snu Precision Co., Ltd.Inventors: Heui-Jae Pahk, Woo-Jung Ahn, Young-Min Hwang, Chang-Yeol Lee, Ji-Won Choi
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Publication number: 20120115772Abstract: A process for the conjugation of a polymer to a protein, which comprises reacting a polymeric conjugating agent with said protein, in an aqueous medium, in the presence of an amphipathic sugar polymer. The process is particularly useful when conjugating PEG to proteins, particularly to proteins which have previously proved difficult to PEGylate in acceptable yields, for example INF-?.Type: ApplicationFiled: July 15, 2010Publication date: May 10, 2012Inventors: Ji-Won Choi, Antony Godwin, Estera Pawlisz
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Patent number: 8030237Abstract: The present invention relates to a dielectric thin film composition showing linear dielectric properties, in which tin oxides (SnO2) are introduced into a (Ba,Sr)TiO3 (BSTO) dielectric thin film in a continuous diffusion gradient manner in composition. Since the non-linear dielectric properties of BSTO are converted to linear dielectric properties by the addition of SnO2 according to the present invention, the dielectric thin film composition of the present invention is characterized in that: there is little change in the capacitance according to the applied electric field; it has a high dielectric constant capable of showing a desired capacitance even at a thickness suitable for preventing the occurrence of electron tunneling; and it exhibits paraelectric properties similar to the conventional dielectric substances such as SiO2 while having a very low dielectric loss.Type: GrantFiled: August 6, 2009Date of Patent: October 4, 2011Assignee: Korea Institute of Science and TechnologyInventors: Ji-Won Choi, Won Kook Choi, Seok-Jin Yoon
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Patent number: 8013496Abstract: The present invention relates to a piezoelectric linear motor that can make relatively low abrasion and accurate linear movement since stationary AC voltages are applied to two piezoelectric elements with a phase difference. The present invention provides a piezoelectric linear motor, comprising: a piezoelectric substrate having a first piezoelectric element and a second piezoelectric element, wherein AC voltages are applied to the first and second piezoelectric elements with a phase difference; a metallic elastic body having first and second elastic bodies coupled to the piezoelectric elements and a central protrusion protruded at the central portion connecting the first and second elastic bodies, wherein the central protrusion oscillates elliptically during an application of the voltage; and a mover brought into contact with the central protrusion of the metallic elastic body for a linear movement, and wherein the movement of the mover is orthogonal to the central protrusion.Type: GrantFiled: December 8, 2006Date of Patent: September 6, 2011Assignee: Korea Institute of Science and TechnologyInventors: Chong Yun Kang, Seok Jin Yoon, Dae Yong Jeong, Hyun Jai Kim, Piotr Vasiljev, Ji Won Choi
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Publication number: 20110212323Abstract: The present invention relates to a method for preparing oxide thin films with high sensitivity and reliability, which can be advantageously used in the fabrication of articles such as gas sensors. The present invention establishes a high reliability process for preparing large area microsphere templates which may be applicable to silicone semiconductor processes by simple plasma surface treatment and spin coating. The present invention achieves remarkably enhanced sensitivities of thin films of gas sensors by controlling the nanostructure shapes of hollow hemisphere oxide thin films by using simple plasma treatment. In particular, the gas sensor based on the nanostructured TiO2 hollow hemisphere according to the present invention exhibits higher sensitivity, faster response and recovery speed to CO gas over conventional TiO2 gas sensors.Type: ApplicationFiled: September 1, 2010Publication date: September 1, 2011Inventors: Ho Won Jang, Seok-Jin Yoon, Jin Sang Kim, Chong Yun Kang, Ji-Won Choi, Hi Gyu Moon
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Publication number: 20110182855Abstract: Novel biologically active compounds of the general formula (I) in which one of X and X? represents a polymer, and the other represents a hydrogen atom; each Q independently represents a linking group; W represents an electron-withdrawing moiety or a moiety preparable by reduction of an electron-withdrawing moiety; or, if X? represents a polymer, X-Q-W— together may represent an electron withdrawing group; and in addition, if X represents a polymer, X? and electron withdrawing group W together with the interjacent atoms may form a ring; each of Z1 and Z2 independently represents a group derived from a biological molecule, each of which is linked to A and B via a nucleophilic moiety; or Z1 and Z2 together represent a single group derived from a biological molecule which is linked to A and B via two nucleophilic moieties; A is a C1-5 alkylene or alkenylene chain; and B is a bond or a C1-4 alkylene or alkenylene chain; are formed by conjugating a suitable polymer to a suitable biologically active molecule via nucType: ApplicationFiled: March 31, 2011Publication date: July 28, 2011Applicant: POLYTHERICS LIMITEDInventors: Stephen James BROCCHINI, Antony Robert Godwin, Elisa Pedone, Ji-Won Choi, Sunil Shaunak
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Patent number: 7939630Abstract: Novel biologically active compounds of the general formula (I) in which one of X and X? represents a polymer, and the other represents a hydrogen atom; each Q independently represents a linking group; W represents an electron-withdrawing moiety or a moiety preparable by reduction of an electron-withdrawing moiety; or, if X? represents a polymer, X-Q-W— together may represent an electron withdrawing group; and in addition, if X represents a polymer, X? and electron withdrawing group W together with the interjacent atoms may form a ring; each of Z1 and Z2 independently represents a group derived from a biological molecule, each of which is linked to A and B via a nucleophilic moiety; or Z1 and Z2 together represent a single group derived from a biological molecule which is linked to A and B via two nucleophilic moieties; A is a C1-5 alkylene or alkenylene chain; and B is a bond or a C1-4 alkylene or alkenylene chain; are formed by conjugating a suitable polymer to a suitable biologically active molecule via nucType: GrantFiled: July 28, 2009Date of Patent: May 10, 2011Assignee: Polytherics LimitedInventors: Stephen James Brocchini, Antony Robert Godwin, Elisa Pedone, Ji-Won Choi, Sunil Shaunak
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Publication number: 20110001988Abstract: An apparatus for measuring a thickness, which includes: a first beam splitter for reflecting or transmitting a ray irradiated from an optical source or a ray reflected by a measurement object; a first lens part which condenses a ray to the measurement object and generates a reference ray having a difference of a light path in comparison with a ray reflected by the measurement object; a second lens part for condensing a ray to the object to be measured; an interference light detector which corresponds to at the first lens part so as to form a light path and detects an interference signal generated by the ray reflected by the measurement object and the reference ray; a spectroscopic detector which corresponds to the second lens part so as to form a light path different from the light path formed by the interference light detector and splits the ray reflected by the measurement object so as to detect an intensity and a wavelength of each split ray; and a light path converter for selectively transmitting a ray toType: ApplicationFiled: April 2, 2008Publication date: January 6, 2011Applicant: SNU PRECISION CO., LTD.Inventors: Heui-Jae Pahk, Woo-Jung Ahn, Young-Min Hwang, Chang-Yeol Lee, Ji-Won Choi
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Publication number: 20100302170Abstract: A method of operating an input mode of a mobile terminal having a first input means and a second input means is provided. The method includes: displaying an input screen which is set as a first input mode; determining whether the second input means is in an activated state; and displaying a changed input screen which is set as a second input mode when the second input means is determined to be in an activated state.Type: ApplicationFiled: May 28, 2010Publication date: December 2, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jun Kyu KANG, Sang Yoon LEE, Ji Won CHOI, Dong Seong SEO
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Publication number: 20100294355Abstract: A high-efficiency solar cell device of the present invention comprising an active layer composed of a p-i-n form polymer-quantum dot composite having a consolidated core/shell structure which is formed by heating a coating layer of a solution of an organic-inorganic mixture of a p-type organic polymer, an n-type organic compound, and a semiconductor quantum dot dissolved in an organic solvent is capable of overcoming the shortcoming of the conventional solar cell devices having a multi-layered thin film structure.Type: ApplicationFiled: December 2, 2009Publication date: November 25, 2010Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Won-Kook Choi, Dong Hee Park, Dong-Ick Son, Sang Yub Lee, Ji-Won Choi
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Publication number: 20100248578Abstract: A display panel includes a base substrate, a first linear pattern on the base substrate along a first direction and a second linear pattern on the first linear pattern along a second direction crossing the first direction. The display panel further includes a color filter layer on the first linear pattern and an overcoat layer on the second linear pattern. The color filter layer includes a number of color filter patterns disposed along the first direction. The first direction is perpendicular to the second direction. The invention also discloses a fabrication method of the display panel. The method includes forming the first linear pattern and forming the second linear pattern. Here, a gravure printing forms the first and the second linear patterns. The fabrication method further includes forming the color filter layer. The method further includes flattening the color filter layer and forming an overcoat layer on the second linear pattern.Type: ApplicationFiled: June 14, 2010Publication date: September 30, 2010Inventors: Ji-Won CHOI, Byoung-Joo Kim, Gug Rae Jo, Jin-Kyung Choi
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Publication number: 20100239517Abstract: The invention provides a novel process for conjugating a polymer, especially PEG, to a protein or peptide, which comprises reacting a polymeric conjugation reagent with a protein or peptide containing a polyhistidine tag under conditions such that conjugation occurs via said polyhistidine tag. The resulting conjugates are novel.Type: ApplicationFiled: October 8, 2008Publication date: September 23, 2010Inventors: Stephen Brocchini, Penny Bryant, Yuehua Cong, Ji-Won Choi, Antony Godwin, Keith Powell
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Patent number: 7709824Abstract: The present invention relates to an AC voltage-driven light emitting device having a single active layer of a core-shell structure (p-i-n structure) in which intrinsic semiconductor nanocrystals, exciton combination centers, are uniformly and isotropically distributed around p-type polymer particles, and n-type small molecular particles surround the semiconductor nanocrystals and p-type polymer, and a manufacturing method thereof. An active layer of a core-shell structure using a polymer-semiconductor nano hybrid in the light-emitting device has an inversion symmetry characteristic showing the same current-voltage characteristic during application of a voltage in a forward direction and a reverse direction. Therefore, due to this inversion symmetry characteristic, the light emitting can be driven by even an AC voltage.Type: GrantFiled: January 27, 2009Date of Patent: May 4, 2010Assignee: Korea Institute of Science and TechnologyInventors: Won Kook Choi, Dong Hee Park, Sang Yub Ie, Dong Ick Son, Ji Won Choi
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Publication number: 20100032645Abstract: The present invention relates to an AC voltage-driven light emitting device having a single active layer of a core-shell structure (p-i-n structure) in which intrinsic semiconductor nanocrystals, exciton combination centers, are uniformly and isotropically distributed around p-type polymer particles, and n-type small molecular particles surround the semiconductor nanocrystals and p-type polymer, and a manufacturing method thereof. An active layer of a core-shell structure using a polymer-semiconductor nano hybrid in the light-emitting device has an inversion symmetry characteristic showing the same current-voltage characteristic during application of a voltage in a forward direction and a reverse direction. Therefore, due to this inversion symmetry characteristic, the light emitting can be driven by even an AC voltage.Type: ApplicationFiled: January 27, 2009Publication date: February 11, 2010Inventors: Won Kook CHOI, Dong Hee PARK, Sang Yub IE, Dong Ick SON, Ji Won CHOI
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Publication number: 20100035749Abstract: The present invention relates to a dielectric thin film composition showing linear dielectric properties, in which tin oxides (SnO2) are introduced into a (Ba,Sr)TiO3 (BSTO) dielectric thin film in a continuous diffusion gradient manner in composition. Since the non-linear dielectric properties of BSTO are converted to linear dielectric properties by the addition of SnO2 according to the present invention, the dielectric thin film composition of the present invention is characterized in that: there is little change in the capacitance according to the applied electric field; it has a high dielectric constant capable of showing a desired capacitance even at a thickness suitable for preventing the occurrence of electron tunneling; and it exhibits paraelectric properties similar to the conventional dielectric substances such as SiO2 while having a very low dielectric loss.Type: ApplicationFiled: August 6, 2009Publication date: February 11, 2010Inventors: Ji-Won Choi, Won Kook Choi, Seok-Jin Yoon
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Publication number: 20090298154Abstract: Novel biologically active compounds of the general formula (I) in which one of X and X? represents a polymer, and the other represents a hydrogen atom; each Q independently represents a linking group; W represents an electron-withdrawing moiety or a moiety preparable by reduction of an electron-withdrawing moiety; or, if X? represents a polymer, X-Q-W— together may represent an electron withdrawing group; and in addition, if X represents a polymer, X? and electron withdrawing group W together with the interjacent atoms may form a ring; each of Z1 and Z2 independently represents a group derived from a biological molecule, each of which is linked to A and B via a nucleophilic moiety; or Z1 and Z2 together represent a single group derived from a biological molecule which is linked to A and B via two nucleophilic moieties; A is a C1-5 alkylene or alkenylene chain; and B is a bond or a C1-4 alkylene or alkenylene chain; are formed by conjugating a suitable polymer to a suitable biologically active molecule via nucType: ApplicationFiled: July 28, 2009Publication date: December 3, 2009Applicant: POLYTHERICS LIMITEDInventors: Stephen James Brocchini, Antony Robert Godwin, Elisa Pedone, Ji-Won Choi, Sunil Shaunak
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Publication number: 20090254963Abstract: A method and an apparatus for providing a virtual channel service are disclosed. The method includes maintaining a contents list recorded in a personal video recorder and a virtual channel information, determining a playback order of recorded contents included in the list in accordance with a preset algorithm, and playing back in sequence the recorded contents through a predetermined virtual channel. As a result, a user may approach easily to the recorded contents.Type: ApplicationFiled: April 8, 2009Publication date: October 8, 2009Applicant: ALTICAST CORPORATIONInventors: You-Jin Lee, Sung-Woo Nam, Tae-Min Ahn, Hyo-Geun Wang, Hyun-Kyu Lee, Ji-Won Choi
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Publication number: 20090251026Abstract: The present invention relates to a piezoelectric linear motor that can make relatively low abrasion and accurate linear movement since stationary AC voltages are applied to two piezoelectric elements with a phase difference. The present invention provides a piezoelectric linear motor, comprising: a piezoelectric substrate having a first piezoelectric element and a second piezoelectric element, wherein AC voltages are applied to the first and second piezoelectric elements with a phase difference; a metallic elastic body having first and second elastic bodies coupled to the piezoelectric elements and a central protrusion protruded at the central portion connecting the first and second elastic bodies, wherein the central protrusion oscillates elliptically during an application of the voltage; and a mover brought into contact with the central protrusion of the metallic elastic body for a linear movement, and wherein the movement of the mover is orthogonal to the central protrusion.Type: ApplicationFiled: December 8, 2006Publication date: October 8, 2009Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Chong Yun Kang, Seok Jin Yoon, Dae Yong Jeong, Hyun Jai Kim, Piotr Vasiljev, Ji Won Choi
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Publication number: 20090239149Abstract: A cathode thin film for a lithium secondary cell, which uses a cathode active material substituting Sn for Mn in lithium manganese oxide, has a high discharge capacity and an improved cycle property.Type: ApplicationFiled: December 29, 2008Publication date: September 24, 2009Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Ji-Won CHOI, Seok-Jin YOON, Dong Wook SHIN
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Publication number: 20090176866Abstract: A complex that comprises a narrow molecular weight distribution polymer that includes units derived from an acrylic acid or a salt thereof, and (i) a substance that has pharmacological activity against a pathogenic organism, or (ii) a substance that has pharmacological activity against a cancer, or (iii) one or more agents selected from antigens and immunogens is useful in treating and/or inducing immunity to the pathogenic organism or the cancer, and for inducing immunity to the antigen or immunogen.Type: ApplicationFiled: January 7, 2005Publication date: July 9, 2009Inventors: Sunil Shaunak, Stephen Brocchini, Antony Godwin, Ji-Won Choi