Patents by Inventor Chong-Yun Kang
Chong-Yun Kang 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: 20120298008Abstract: Provided are a dielectric thin film and a method for manufacturing the same. The dielectric thin film has a composition represented by the formula of TaxMg1-xO, wherein 0.082?x?0.89. The dielectric thin film provides excellent dielectric characteristics. Particularly, the dielectric thin film provides a high relative permittivity as well as low dielectric loss and leakage current, although it is formed (deposited) at a low temperature of 350° C. or lower (between room temperature and 350° C.).Type: ApplicationFiled: July 25, 2011Publication date: November 29, 2012Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Ji Won CHOI, Seok Jin YOON, Jin Sang KIM, Chong Yun KANG, Ho Won JANG, Yun Hoe KIM
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Publication number: 20120211355Abstract: Disclosed are a transparent conductive composition including a material of the following formula, a target, a transparent conductive thin film using the target, and a method for fabricating the same. The disclosed transparent conductive composition and transparent conductive thin film have superior conductivity (low resistivity) and high light transmittance. Especially, they may be usefully applied for the flexible electronic devices, which may be called the core of the future display industry, because they have low resistivity of not greater than 10?3 ?·cm and a high light transmittance of at least 90% even when deposition is carried out at room temperature. AlxZn1-xO In the above formula, x is within the range of 0.04?x?0.063.Type: ApplicationFiled: April 11, 2011Publication date: August 23, 2012Applicant: Korea Institute of Science & TechnologyInventors: Ji Won CHOI, Seok Jin Yoon, Won Kook Choi, Jin Sang Kim, Chong Yun Kang, Ho Won Jang, Keun Jung
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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: 20100330298Abstract: A method for fabricating a ferroelectric ceramic film. The method includes coating a gel film on a substrate. The gel film has at least one ferroelectric material and at least one ultra-violet (UV) sensitive material. The method further includes simultaneously heating the gel film and irradiating a UV ray onto the gel film transforming the gel film into an amorphous ferroelectric film made of the at least one ferroelectric material. The above heating may be performed by using a rapid thermal processing technique.Type: ApplicationFiled: June 30, 2009Publication date: December 30, 2010Inventors: Chong Yun Kang, Kwang Hwan Cho, Seok-Jin Yoon, Min Gyu Kang
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Publication number: 20100084947Abstract: The present invention relates to a piezoelectric energy harvester having a high energy transformation efficiency and a low natural frequency. The piezoelectric energy harvester includes an elastic substrate having a spiral spring structure, a first electrode formed on the elastomeric substrate, a piezoelectric film formed on the first electrode and a second electrode formed on the piezoelectric film.Type: ApplicationFiled: October 1, 2009Publication date: April 8, 2010Inventors: Seok-Jin YOON, Hyun Cheol SONG, Chong Yun KANG, Jin Sang KIM
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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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Patent number: 7567017Abstract: A piezoelectric linear motor for amplifying the change in at least one dimension of a piezoelectric material is disclosed. A shaft is connected axial-movably to a piezoelectric actuator. The actuator includes a piezoelectric ceramic that expands or contracts in response to an applied voltage. The expansion or contraction of the piezoelectric ceramic is amplified by converting the displacement due to expansion/contraction into a greater displacement of a top plate to which the shaft is coupled. The greater displacement is, for instance, by causing the expansion/contraction of the piezoelectric ceramic into a convex or concave bending of a complex of which the piezoelectric ceramic is a part. In a preferred embodiment the base plate is attached to the piezoelectric ceramic, a slanted plate conically extending from the base plate, and a top plate formed at the center of the slanted plate to form an assembly that changes its curvature to amplify the displacement.Type: GrantFiled: December 27, 2005Date of Patent: July 28, 2009Assignee: Korea Institute of Science and TechnologyInventors: Seok Jin Yoon, Hyun Jai Kim, Hyun Phill Ko, Chong Yun Kang
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Publication number: 20090134744Abstract: A ring type piezoelectric ultrasonic resonator includes a piezoelectric ceramic segmented for each quarter of wavelength of an applied AC electric field, wherein the piezoelectric ceramic is alternately polarized in polarization units each having two segments, and a sine wave AC electric field and a sine wave AC electric field having a predetermined phase difference from the sine wave AC electric field are alternately applied to each of the segments. Further, the number of the segments of the piezoelectric ceramic is an integral multiple of 4. Moreover, the sine wave AC electric field applied to each of the segments of the piezoelectric ceramic has a phase difference of 90-degree with respect to adjacent segments.Type: ApplicationFiled: November 18, 2008Publication date: May 28, 2009Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Seok Jin Yoon, Hyun Jai Kim, Chong Yun Kang, Hyun Cheol Song
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Patent number: 6984920Abstract: The present invention relates to a linear motor which draws its operating power from ultrasonic vibration above the frequency of 20 kHz which is generated by piezoelectric ceramic. More particularly, the invention relates to a linear piezoelectric ultrasonic motor which linearly operates a slider due to a frictional force generated by applying sinusoidal electric field with a 90 degree phase difference to a pair of piezoelectric ceramic. This causes an elliptical mechanical vibration on a shaking beam which is connected to the piezoelectric ceramic.Type: GrantFiled: August 2, 2002Date of Patent: January 10, 2006Assignee: Korea Institute of Science and TechnologyInventors: Seok Jin Yoon, Hyun Jai Kim, Ji Won Choi, Chong Yun Kang, Dong Kyun Lee, Piotr Vasiljev
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Patent number: 6841496Abstract: The invention relates to a low temperature co-firing ceramic (LTCC) composition for microwave frequency represented by the following formula 1: Ca[(Li1/3Nb2/3)1-xTix]O3-?+y(B2O3.ZnO.SiO2.PbO)??(1) wherein x is molar ratio and 0?x?0.3; and y is wt % ratio and 0?y?15. The present invention relates to dielectric LTCC composition for microwave frequency that has high dielectric constants, high Q values, and stable temperature coefficients of the resonant frequency, and has sintering temperature as low as ?900° C. so as to be co-fired without reaction with an electrode such as silver (Ag). The compositions have excellent characteristics required to cellular phones and PCS in the range of 800 MHz˜1.9 GHz, which is commonly used, and laminated chip filters and antennas in the range of IMT 2000 of 2 GHz, which will be used.Type: GrantFiled: December 5, 2002Date of Patent: January 11, 2005Assignee: Korea Institute of Science and TechnologyInventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Jong-Yoon Ha
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Patent number: 6825819Abstract: A ceramic chip antenna for use in ultra-high frequency communications. The ceramic chip antenna according to the present invention comprises a main body, first and second helical conductors, and a single power supply section for supplying power to the first and second helical conductors. The main body is produced by laminating a plurality of ceramic sheets made of a dielectric material. The first and second helical conductors are formed inside the main body by a screen-printing method. The first and second helical conductors have the same axis of helical rotation, as view from the power supply section.Type: GrantFiled: November 20, 2002Date of Patent: November 30, 2004Assignee: Korean Institute of Science and TechnologyInventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Sung-Hun Sim
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Patent number: 6790800Abstract: Disclosed is a dielectric ceramic composition represented by (1−x) (Mg1/3Ta2/3)O2-xZrO2(0<x≦0.2) that has high dielectric constants, high quality factor (Q) values, and stable temperature coefficients of the resonant frequency. The composition can easily achieve a high quality factor (Q) value by sintering for a lesser duration and at lower temperatures.Type: GrantFiled: December 19, 2002Date of Patent: September 14, 2004Assignee: Korea Institute of Science and TechnologyInventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Jong-Yoon Ha
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Publication number: 20030222822Abstract: A ceramic chip antenna for use in ultra-high frequency communications. The ceramic chip antenna according to the present invention comprises a main body, first and second helical conductors, and a single power supply section for supplying power to the first and second helical conductors. The main body is produced by laminating a plurality of ceramic sheets made of a dielectric material. The first and second helical conductors are formed inside the main body by a screen-printing method. The first and second helical conductors have the same axis of helical rotation, as view from the power supply section.Type: ApplicationFiled: November 20, 2002Publication date: December 4, 2003Inventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Sung-Hun Sim
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Publication number: 20030216244Abstract: Disclosed is a dielectric ceramic composition represented by (1−x)(Mg1/3Ta2/3)O2-xZrO2(0≦x≦0.2) that has high dielectric constants, high quality factor (Q) values, and stable temperature coefficients of the resonant frequency. The composition can easily achieve a high quality factor (Q) value by sintering for a lesser duration and at lower temperatures.Type: ApplicationFiled: December 19, 2002Publication date: November 20, 2003Inventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Jong-Yoon Ha
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Patent number: 6650303Abstract: A ceramic chip antenna, which has a small size and a broad bandwidth, is provided. The ceramic chip antenna consists of a ceramic body with cuboid shape, a conductor wound helically inside the ceramic body, and signal-feed terminal formed on a surface of the ceramic body. The ceramic chip antenna with a helical conductor patterns formed in a symmetrical dipole shape is provided, which has a high gain value and excellent radiation characteristics. Also, it can be built-in inside a mobile terminal due to its small size. The ceramic chip antenna according to the present invention can have a broad bandwidth that satisfies the variable frequency of the present mobile communication system.Type: GrantFiled: February 25, 2002Date of Patent: November 18, 2003Assignee: Korea Institute of Science and TechnologyInventors: Hyun Jai Kim, Seok Jin Yoon, Ji Won Choi, Chong Yun Kang, Sung Hun Sim
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Publication number: 20030211931Abstract: The invention relates to a low temperature co-firing ceramic (LTCC) composition for microwave frequency represented by the following formula 1:Type: ApplicationFiled: December 5, 2002Publication date: November 13, 2003Inventors: Hyun-Jai Kim, Seok-Jin Yoon, Ji-Won Choi, Chong-Yun Kang, Jong-Yoon Ha
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Publication number: 20030178915Abstract: The present invention relates to a linear motor which draws its operating power from ultrasonic vibration above the frequency of 20 kHz which is generated by piezoelectric ceramic. More particularly, the invention relates to a linear piezoelectric ultrasonic motor which linearly operates a slider due to a frictional force generated by applying sinusoidal electric field with a 90 degree phase difference to a pair of piezoelectric ceramic. This causes an elliptical mechanical vibration on a shaking beam which is connected to the piezoelectric ceramic.Type: ApplicationFiled: August 2, 2002Publication date: September 25, 2003Inventors: Seok Jin Yoon, Hyun Jai Kim, Ji Won Choi, Chong Yun Kang, Dong Kyun Lee, Piotr Vasiljev
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Patent number: 6498543Abstract: A monoblock dielectric duplexer comprises resonant holes. Conductive electrodes and couplers are formed on one side of the dielectric block, whose other sides are covered with a conductive material. The conductive electrodes in a transmit-filtering portion are formed in an inter-digitating manner while the conductive electrodes in receive-filtering portion are formed to be of pad-shape. In the duplexer, capacitances of capacitors comprised of the conductive electrodes are easily and accurately set to desired values by determining the number and/or the lengths of fingers that the inter-digitating electrodes have.Type: GrantFiled: June 19, 2001Date of Patent: December 24, 2002Assignee: Korea Institute of Science and TechnologyInventors: Hyun Jai Kim, Seok Jin Yoon, Ji Won Choi, Chong Yun Kang, Hyeung Kwon Choi
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Publication number: 20020190906Abstract: A ceramic chip antenna, which has a small size and a broad bandwidth, is provided. The ceramic chip antenna consists of a ceramic body with cuboid shape, a conductor wound helically inside the ceramic body, and signal-feed terminal formed on a surface of the ceramic body. The ceramic chip antenna with a helical conductor patterns formed in a symmetrical dipole shape is provided, which has a high gain value and excellent radiation characteristics. Also, it can be built-in inside a mobile terminal due to its small size. The ceramic chip antenna according to the present invention can have a broad bandwidth that satisfies the variable frequency of the present mobile communication system.Type: ApplicationFiled: February 25, 2002Publication date: December 19, 2002Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Hyun Jai Kim, Seok Jin Yoon, Ji Won Choi, Chong Yun Kang, Sung Hun Sim