Patents by Inventor Dong-Hoon Choi
Dong-Hoon 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: 8445305Abstract: Disclosed is a method for manufacturing 3-dimensional structure using a thin film with a columnar nano pores and a manufacture thereof. A method for packaging an MEMS device or an NEMS device in accordance with an embodiment of the present invention includes: forming a sacrificial layer; forming a thin film having columnar nano pores formed therein by depositing one of a metallic material, an oxide, a nitride and a fluoride on the sacrificial layer; forming a support layer on the thin film and patterning the support layer; removing the sacrificial layer through use of the nano pores of the thin film parts of which are exposed by patterning the support layer; and forming a shielding layer on the thin film and the support layer.Type: GrantFiled: May 28, 2010Date of Patent: May 21, 2013Assignee: Korea Advanced Institute of Science and TechnologyInventors: Jun-Bo Yoon, Byung-Kee Lee, Dong-Hoon Choi, Hyun-Ho Yang
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Patent number: 8420231Abstract: An iridium phosphorescent dendrimer represented by Formula 1: wherein A is a carbazole-based dendron. Also disclosed is a method of preparing the iridium phosphorescent dendrimer and an electroluminescent device including the iridium phosphorescent dendrimer.Type: GrantFiled: October 8, 2009Date of Patent: April 16, 2013Assignees: Samsung Electronics Co., Ltd., SNU R&DB FoundationInventors: Dong-hoon Choi, Kyung-moon Jung, Min-ju Cho
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Publication number: 20130063857Abstract: Disclosed herein is an MEMS variable capacitor and its driving method, the MEMS variable capacitor including, a first electrode, a second electrode floating over the first electrode upper part, a fixed electrode separated at the second electrode side surface, and a drifting electrode placed between the second electrode and the fixed electrode, connected to the second electrode, and physically contacting the fixed electrode by a voltage applied to the fixed electrode.Type: ApplicationFiled: May 27, 2011Publication date: March 14, 2013Applicants: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, LG INNOTEK CO., LTD.Inventors: Chang Wook Kim, Dong Chan Park, Ju Young Song, Sang Hun Lee, Sung Bae Cho, Hyun Ho Yang, Jun Bo Yoon, Dong Hoon Choi, Chang Hoon Han
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Publication number: 20120298625Abstract: In the present invention, a nanoporous membrane having a columnar structure is manufactured through a deposition technology used in a semiconductor process, and the size of a nanopore is adjusted by etching the lower surface of the manufactured nanoporous membrane or using a seed layer and a nanobead layer so that scaling up is available at a lowered process temperature and the size of the nanopore can be easily adjusted when manufacturing the nanoporous membrane having a columnar structure.Type: ApplicationFiled: February 13, 2012Publication date: November 29, 2012Applicant: Korea Advanced Institute of Science and TechnologyInventors: Dae Sik Lee, Jun Bo Yoon, Dong Hoon Choi, Byung Kee Lee, Moon Youn Jung, Seung Hwan Kim
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Publication number: 20120283821Abstract: The present invention relates to a stent for protecting a branch blood vessel at a branch-point lesion. The stent is inserted into and widened in a main blood vessel having the branch blood vessel extending in a slant from the branch-point lesion, thereby simultaneously expanding the main blood vessel and providing a smooth flow of blood towards the branch blood vessel. As a result, it is possible to simultaneously expand the main blood vessel and to sufficiently secure a passage from the main blood vessel towards the branch blood vessel. As such, the flow of blood is kept smooth. Further, after the stent is inserted into the main blood vessel, another stent, a guide wire, and related tools and catheter can be inserted in the direction of the branch blood vessel in a more accurate manner.Type: ApplicationFiled: November 10, 2010Publication date: November 8, 2012Applicant: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITYInventors: Myeong-Ki Hong, Yangsoo Jang, Dong Hoon Choi
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Patent number: 8298453Abstract: Photochromic dyes are disclosed. A photochromic dye can include a first photo-reactive group and a second photo-reactive group. A first photochromic reaction can be induced in the first photo-reactive group of the photochromic dye by radiation having a first wavelength, and a second photochromic reaction can be induced in the second photo-reactive group of the photochromic dye by radiation having a second wavelength.Type: GrantFiled: January 6, 2010Date of Patent: October 30, 2012Assignee: Korea University Research and Business FoundationInventor: Dong Hoon Choi
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Patent number: 8287775Abstract: Photochromic dyes are disclosed. A photochromic dye can include a first photo-reactive group and a second photo-reactive group. A first photochromic reaction can be induced in the first photo-reactive group of the photochromic dye by radiation having a first intensity, and a second photochromic reaction can be induced in the second photo-reactive group of the photochromic dye by radiation having a second intensity. The second intensity may be greater than the first intensity.Type: GrantFiled: February 17, 2010Date of Patent: October 16, 2012Assignee: Korea University Research and Business FoundationInventor: Dong Hoon Choi
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Publication number: 20120116500Abstract: Provided is an H-side branch stent including a first stent having a plurality of cells and a hollow cylindrical shape, at least one bridge having one end connected to a distal end of the first stent, and a second stent having a front end connected to the other end of the bridge, and having a plurality of cells and a hollow cylindrical shape. Accordingly, the H-side branch stent can prevent re-stenosis of the opening of the branch blood vessel since the stent can completely support an inner circumference of an opening of a branch blood vessel in a circumferential direction, and prevent blood flow disturbance because stents are not densely concentrated to a boundary between a main blood vessel and the branch blood vessel and some regions of the stent do not project into the main blood vessel.Type: ApplicationFiled: November 3, 2009Publication date: May 10, 2012Applicant: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITYInventors: Yang Soo Jang, Myeong Ki Hong, Dong Hoon Choi
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Patent number: 8120451Abstract: The present invention relates to a micro-electromechanical system (MEMS) and, more particularly, to an electrostatic actuator, and a driving method thereof and an application device thereof. The electrostatic actuator in accordance with the present invention comprises a fixed electrode, an electric charge charging unit electrically insulated from the fixed electrode, and a moving electrode spaced apart from the fixed electrode and the electric charge charging unit. In accordance with the present invention, the electrostatic actuator with a very low driving voltage and an arbitrarily controllable driving voltage when compared with a conventional electrostatic actuator is provided. In addition, the electrostatic actuator having durability against external noise and enabling a reliable consecutive operation is provided. Further, in accordance with the present invention, non-volatile mechanical memory, a logic circuit and a switch employing the electrostatic actuator are provided.Type: GrantFiled: March 6, 2008Date of Patent: February 21, 2012Assignee: Korea Advanced Institute of Science and TechnologyInventors: Jun-Bo Yoon, Hyun-Ho Yang, Dong-Hoon Choi
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Publication number: 20110263018Abstract: The present invention relates to a method of preparing a delivery system capable of loading bioactive growth factors that are essential for the differentiation and proliferation of cells and is characterized as loading at least two types of components comprising growth factors in a single carrier, whereby the release of each of the plurality of growth factors can be temporally controlled.Type: ApplicationFiled: October 12, 2010Publication date: October 27, 2011Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Kwideok PARK, Dong Keun Han, Dong Hoon Choi, Jae-Jin Kim, Hee Joong Kim, Heung Jae Chun
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Publication number: 20110233737Abstract: Disclosed is a method for manufacturing 3-dimensional structure using a thin film with a columnar nano pores and a manufacture thereof. A method for packaging an MEMS device or an NEMS device in accordance with an embodiment of the present invention includes: forming a sacrificial layer; forming a thin film having columnar nano pores formed therein by depositing one of a metallic material, an oxide, a nitride and a fluoride on the sacrificial layer; forming a support layer on the thin film and patterning the support layer; removing the sacrificial layer through use of the nano pores of the thin film parts of which are exposed by patterning the support layer; and forming a shielding layer on the thin film and the support layer.Type: ApplicationFiled: May 28, 2010Publication date: September 29, 2011Inventors: Jun-Bo Yoon, Byung-Kee Lee, Dong-Hoon Choi, Hyun-Ho Yang
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Publication number: 20110209294Abstract: An agent that is capable of improving dye fastness is provided. The agent includes a compound that includes at least one functional group capable of forming at least one interaction or at least one bond with a fiber or a dye molecule. Also, a method for using the agents to improve dye fastness and a dyed article including the agent are provided.Type: ApplicationFiled: February 26, 2010Publication date: September 1, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110213046Abstract: Nanoparticles can include a core linked to a polymerizable moiety that can be polymerized, cross-linked or cured. The polymerizable nanoparticles can be included in a composition for a polymerization, cross-linking or curing reaction in an amount and disposition sufficient for inhibiting or preventing volume shrinkage during polymerization, cross-linking or curing reaction. Also, the nanoparticles can be included with monomers, dendrimers, oligomers or polymers in the compositions that can be reacted to form a polymerized, cross-linked or cured product.Type: ApplicationFiled: February 26, 2010Publication date: September 1, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110198546Abstract: Photochromic dyes are disclosed. A photochromic dye can include a first photo-reactive group and a second photo-reactive group. A first photochromic reaction can be induced in the first photo-reactive group of the photochromic dye by radiation having a first intensity, and a second photochromic reaction can be induced in the second photo-reactive group of the photochromic dye by radiation having a second intensity. The second intensity may be greater than the first intensity.Type: ApplicationFiled: February 17, 2010Publication date: August 18, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110163282Abstract: Photochromic dyes are disclosed. A photochromic dye can include a first photo-reactive group and a second photo-reactive group. A first photochromic reaction can be induced in the first photo-reactive group of the photochromic dye by radiation having a first wavelength, and a second photochromic reaction can be induced in the second photo-reactive group of the photochromic dye by radiation having a second wavelength.Type: ApplicationFiled: January 6, 2010Publication date: July 7, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110159249Abstract: Photocrosslinkable electrically conductive polymers and compositions including the polymers are provided. Also, electrically conductive layers or films formed from the compositions, preparation methods of these, and articles including the electrically conductive layers or films are provided. The electrically conductive polymers according to the present disclosure have photoreactive groups that can be crosslinked using like. The electrically conductive polymers can also be dissolved in aqueous solution. These photocrosslinkable and soluble properties allow the electrically conductive polymers to be used in wet processing to make films and/or to be made into a patterned conductive layer or film using a photomask.Type: ApplicationFiled: December 30, 2009Publication date: June 30, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110155962Abstract: An electrically conductive polymer linked to conductive nanoparticle is provided. The conductive polymer can include conductive monomers and one or more monomers in the conductive polymer can be linked to a conductive nanoparticle and can include a polymerizable moiety so that it can be incorporated into a polymer chain. The electrically conductive monomer can include a 3,4-ethylenedioxythiophene as a conductive monomer. The electrically conductive polymer having the conductive nanoparticle can be prepared into an electrically conductive layer or film for use in electronic devices.Type: ApplicationFiled: December 30, 2009Publication date: June 30, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110155963Abstract: Water-soluble electrically conductive polymers and a composition comprising such polymers are provided. Also, an electrically conductive layer or film formed from the composition, and articles comprising the electrically conductive layer or film are provided. The electrically conductive polymers according to the present disclosure have one or more hydrophilic side chains. Hydrophilic side chains are covalently bonded to the conductive polymers, which allow the polymer to be stable at high temperature. Thus, the stability of electrical conductivity is prolonged. Depending on the concentration of hydrophilic side chains, the conductivity may be changed. The hydrophilic side chains provide a successful way to fabricate a ductile film exhibiting tunable conductivity. Furthermore, high levels of surface-resistance uniformity can be achieved in the field of coating technology that uses eco-friendly water-based solvents to uniformly and quickly coat the conductive polymer on to plastic film surfaces.Type: ApplicationFiled: December 30, 2009Publication date: June 30, 2011Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventor: Dong Hoon CHOI
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Publication number: 20110122048Abstract: A video wall system which includes a plurality of display devices, the video wall display system including a plurality of display devices, and each of the display devices including: a pair of input and output connectors comprising an input connector connected to a first neighboring display device among the plurality of display devices to input an image signal from the first neighboring display device, and an output connector connected to a second neighboring display device to output the input image signal; a signal processor which processes the input image signal; and a display which displays an image based on the processed image signal.Type: ApplicationFiled: July 22, 2010Publication date: May 26, 2011Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Dong-hoon CHOI, Young-kyan YUN, Sung-woo KIM
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Patent number: 7915428Abstract: A photorefractive dendron compound, a photorefractive dendrimer compound and applications thereof, and more particularly, a photorefractive dendron compound, including a non-linear chromophore containing a tricyanopyrroline-based electron-withdrawing group and a carbazole derivative having excellent charge transport properties, a method of preparing the photorefractive dendrimer compound, a photorefractive device including the photorefractive dendrimer compound, and a method of manufacturing the photorefractive device. In the photorefractive dendrimer compound, dendron has the non-linear optical chromophore and carbazole introduced thereto to thus impart one molecule with both photoconductivity and non-linear optical properties, thereby solving conventional problems caused by poor compatibility between photoconductive material and chromophores in conventional photorefractive material.Type: GrantFiled: October 8, 2007Date of Patent: March 29, 2011Assignees: Samsung Electronics Co., Ltd., Seoul National University Industry Foundation, Korea University Industrial & Academic Collaboration FoundationInventors: Dong Hoon Choi, Min Ju Cho, Kyung Moon Jung