Patents by Inventor Jeong-Hyun Cho
Jeong-Hyun Cho 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: 20180360354Abstract: 3D microscale metamaterial structures and methods of making. The metamaterial structure includes a polygonal structure having a plurality of panels connected to one another at structure corners. A metal resonator pattern is provided on each of the panels. The resonator patterns of neighboring panels are electromagnetically coupled to one another across a gap between the resonator patterns at the corresponding structure corner. The panels can be a polymer material, layers of graphene oxide, etc. The metamaterial structure can be a 3D octagram split-ring resonator, and is completely isotropic. The 3D metamaterial structure can be made by a self-folding process.Type: ApplicationFiled: June 4, 2018Publication date: December 20, 2018Applicant: Regents of the University of MinnesotaInventors: Kriti Agarwal, Chao Liu, Jeong-Hyun Cho
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Publication number: 20180294795Abstract: Nanopillar-based closed ring resonator (CRR) MMs, utilizing displacement current in the nano gap medium between nanopillars that significantly increases energy storage in the MMs, leading to an enhanced Q-factor of at least 11000. A metallic nanopillar array is designed in the form of a closed ring (e.g.Type: ApplicationFiled: April 10, 2018Publication date: October 11, 2018Inventors: Jeong-Hyun Cho, Chao Liu
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Publication number: 20180026406Abstract: A connection terminal device and an electronic device having the same are provided. The connection terminal device includes a connection terminal device body, and a connection terminal connected to the connection terminal device body. The connection terminal device also has a front unit disposed on a front surface of the connection terminal device body, a rear unit disposed on a rear surface of the connection terminal device body, and a support disposed on the rear surface of the connection terminal device body. When force is applied to the connection terminal, supporting force is transferred to the rear unit of the connection terminal device body.Type: ApplicationFiled: July 21, 2017Publication date: January 25, 2018Inventors: Myeong-Hwa KIM, Yang-Jean PARK, Yeon-Kwan MOON, Jin-Woo PARK, Myung-Seok BAE, Jeong-Hyun CHO, Jin-Hyuk CHOI, Jae-Ryong HAN, Jang-Won HUR
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Publication number: 20170291819Abstract: Methods of making a microscale, free-standing, 3D, polyhedral, hollow, GO (or other graphene-based) structure using an origami-like self-folding approach. The origami-like self-folding process allows for easy control of size, shape, and thickness of graphene-based membranes, which, in turn, permits fabrication of freestanding 3D microscale polyhedral GO structures for example. With the 3D GO, a novel optical switching behavior is created, resulting from a combination of the geometrical effect of the 3D hollow structure and the water-permeable multi-layered GO membrane that affect the optical paths.Type: ApplicationFiled: April 7, 2017Publication date: October 12, 2017Applicant: Regents of the University of MinnesotaInventors: Jeong-Hyun Cho, Daeha Joung
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Publication number: 20170294698Abstract: Functionalized microscale 3D devices and methods of making the same. The 3D microdevice can be realized with the combination of top-down (lithographic) and bottom-up (origami-inspired self-assembly) processes. The origami-inspired self-assembly approach combined with a top-down process can realize 3D microscale polyhedral structures with metal/semiconductor materials patterned on dielectric materials. In some embodiments, the functionalized 3D microdevices include resonator-based passive sensors, i.e. split ring resonators (SRRs), on 3D, transparent, free-standing, dielectric media (Al2O3).Type: ApplicationFiled: April 7, 2017Publication date: October 12, 2017Applicant: Regents of the University of MinnesotaInventors: Jeong-Hyun Cho, Daeha Joung
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Publication number: 20170294699Abstract: Nanopillar-based THz metamaterials, such as split ring resonator (SRR) MMs, utilizing displacement current in the dielectric medium between nanopillars that significantly increases energy storage in the MMs, leading to enhanced Q-factor. A metallic nanopillar array is designed in the form of a single gap (C-shape) SRR. Vacuum or dielectric materials of different permittivities are filled between the nanopillars to form nanoscale dielectric gaps. In other embodiments, formation of patterned nanowires using anodic aluminum oxide (AAO) templates with porous structures of different heights resulting from an initial step difference made by etching the aluminum (Al) thin film with a photoresist developer prior to the anodization process are disclosed.Type: ApplicationFiled: April 7, 2017Publication date: October 12, 2017Applicant: Regents of the University of MinnesotaInventors: Jeong-Hyun Cho, Chao Liu, Seung Yeon Lee
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Publication number: 20130220821Abstract: Articles of silicon nanowires were synthesized on metal substrates. The preparation minimized the formation of metal silicides and avoided the formation of islands of silicon on the metal substrates. These articles may be used as electrodes of silicon nanowires on current collectors.Type: ApplicationFiled: September 14, 2012Publication date: August 29, 2013Applicant: LOS ALAMOS NATIONAL SECURITY, LLCInventors: Jeong-Hyun Cho, Samuel Thomas Picraux
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Patent number: 8298092Abstract: A tripod type constant velocity joint comprises a housing having three track grooves defined at trisected positions of the housing and extending in an axial direction, and a spider having three -trunnions projectedly formed at trisected positions of the spider to be respectively inserted into the track grooves, each trunnion having a generally oval or elliptical cross-sectional shape and including at least one independent contact surface at each of two opposing sides subjecting to a load. Inner rollers each has an inner surface of a concavely curved contour for receiving a corresponding trunnion therein, and an outer roller is mounted to each inner roller with a plurality of needle rollers engaged there-between.Type: GrantFiled: December 23, 2010Date of Patent: October 30, 2012Assignee: Hyundai Wia CorporationInventors: Jeong Hyun Cho, Dae Hwan Kim, In Sang Lee, Joung Sik Park, Sung Baek An, Seung Man Shin, Hwan Bum Kang
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Publication number: 20120157215Abstract: Provided is a high joint angle tripod type constant velocity joint, which can increase a maximum joint angle amount and can make an outer roller have a relatively small width by forming a protrusion on a circumferential outer surface at a top end of an inner roller, thereby maximizing a vertical movement range of the inner roller while preventing the outer roller from being released, and which can reduce the manufacturing cost by reducing the number of components.Type: ApplicationFiled: December 14, 2011Publication date: June 21, 2012Inventor: Jeong Hyun Cho
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Publication number: 20120135237Abstract: The self-assembly of polyhedral nanostructures having at least one dimension of about 100 nm to about 900 nm with electron-beam lithographically patterned surfaces is provided. The presently disclosed three-dimensional nanostructures spontaneous assemble from two-dimensional, tethered panels during plasma or wet chemical etching of the underlying silicon substrate. Any desired surface pattern with a width as small as fifteen nanometers can be precisely defined in all three dimensions. The formation of curving, continuous nanostructures using extrinsic stress also is disclosed.Type: ApplicationFiled: April 28, 2010Publication date: May 31, 2012Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: David H. Gracias, Jeong-Hyun Cho
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Patent number: 8058589Abstract: The present invention relates to an electric range comprising a body (100) for defining an exterior, an upper plate (400) on a top of the body (100), a working coil (210) provided in the body (100) for generating an electromagnetic force, an upper insulating sheet (240) provided to cover an upper surface of the working coil (210), a temperature sensor (250) secured to the electric part of the upper insulating sheet (240) for sensing a temperature of the upper plate (400) in a close contact with a downside of the upper plate (400), and an elastic part elastically formed in the upper insulating sheet (240) for making the temperature sensor (250) in a close contact with the upper plate (400).Type: GrantFiled: December 22, 2005Date of Patent: November 15, 2011Assignee: LG Electronics Inc.Inventor: Jeong Hyun Cho
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Publication number: 20110159969Abstract: A tripod type constant velocity joint comprises a housing having three track grooves defined at trisected positions of the housing and extending in an axial direction, and a spider having three trunnions projectedly formed at trisected positions of the spider to be respectively inserted into the track, each trunnion having at least two polygonal surfaces at each of two opposing sides subjecting to a load. Inner rollers each has an inner surface of a concavely curved contour for receiving a corresponding trunnion therein, and an outer is mounted to each inner roller with a plurality of needle rollers engaged therebetween.Type: ApplicationFiled: December 23, 2010Publication date: June 30, 2011Applicant: HYUNDAI WIA CorporationInventors: JEONG HYUN CHO, Dae Hwan Kim, In Sang Lee, Joung Sik Park, Sung Baek An, Seung Man Shin, Hwan Bum Kang
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Patent number: 7874924Abstract: A tripod type constant velocity joint comprises a housing having three track grooves defined at trisected positions of the housing and extending in an axial direction, and a spider having three trunnions projectedly formed at trisected positions of the spider to be respectively inserted into the track grooves, each trunnion having at least two polygonal surfaces at each of two opposing sides subjecting to a load. Inner rollers each has an inner surface of a concavely curved contour for receiving a corresponding trunnion therein, and an outer is mounted to each inner roller with a plurality of needle rollers engaged there-between.Type: GrantFiled: October 29, 2007Date of Patent: January 25, 2011Assignee: Hyundai Wia CorporationInventors: Jeong Hyun Cho, Dae Hwan Kim, In Sang Lee, Joung Sik Park, Sung Baek An, Seung Man Shin, Hwan Bum Kang
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Publication number: 20080302782Abstract: The present invention relates to an electric range comprising a body (100) for defining an exterior, an upper plate (400) on a top of the body (100), a working coil (210) provided in the body (100) for generating an electromagnetic force, an upper insulating sheet (240) provided to cover an upper surface of the working coil (210), a temperature sensor (250) secured to the electric part of the upper insulating sheet (240) for sensing a temperature of the upper plate (400) in a close contact with a downside of the upper plate (400), and an elastic part elastically formed in the upper insulating sheet (240) for making the temperature sensor (250) in a close contact with the upper plate (400).Type: ApplicationFiled: December 22, 2002Publication date: December 11, 2008Inventor: Jeong Hyun Cho
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Patent number: 7359681Abstract: A mobile communication terminal transmitter comprises a detecting unit for detecting at least one of a first power level and a first power of reflection; a baseband signal processing unit for outputting at least one of a bias voltage and a power control signal, wherein the bias voltage controls an impedance of the antenna, and the power control signal is applied to an output power correcting unit; and an antenna matching unit for adjusting the amplified transmission signal according to the bias voltage.Type: GrantFiled: July 30, 2004Date of Patent: April 15, 2008Assignee: LG Electronics Inc.Inventor: Jeong Hyun Cho
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Publication number: 20080058107Abstract: A tripod type constant velocity joint comprises a housing having three track grooves which are defined at trisected positions of the housing along a circumferential direction and extend in a radial direction; a spider having three polyhedral trunnions which are projectedly formed at trisected positions of the spider along the circumferential direction to be respectively inserted into the track grooves and each of which has at least two polygonal surfaces; inner rollers a circumferential inner surface of each of which has a curved contour for surrounding the polyhedral trunnion; a plurality of needle rollers assembled to a circumferential outer surface of each inner roller; and outer rollers each formed to be rotated through the needle rollers, to be moved in an axial direction of the inner roller, and to be moved in an axial direction of the track groove along a guide surface of the housing.Type: ApplicationFiled: October 29, 2007Publication date: March 6, 2008Applicant: WIA CorporationInventors: Jeong Hyun Cho, Dae Kim, In Lee, Joung Park, Sung An, Seung Shin, Hwan Kang
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Patent number: 7050780Abstract: A RF transceiver for AMPS communication includes: a baseband processor for generating a transmission intermediate frequency signal and processing a reception intermediate frequency signal; a local oscillator for generating a local oscillation signal in transmission and reception; an up-mixer for combining the transmission intermediate frequency signal with the local frequency signal; a duplexer for processing a radio frequency signal received through an antenna; and a specific frequency removing unit installed between the local oscillator and an up-mixer to remove a specific frequency signal generated from the local oscillator. A filter is installed between the local oscillator and the up-mixer to remove the 2-times frequency of the local oscillation signal of 957.66 MHz, thereby removing the self-quieting phenomenon generated in the channel 76 of AMPS.Type: GrantFiled: June 21, 2002Date of Patent: May 23, 2006Assignee: LG Electronics Inc.Inventor: Jeong-Hyun Cho
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Publication number: 20020197971Abstract: A RF transceiver for AMPS communication includes: a baseband processor for generating a transmission intermediate frequency signal and processing a reception intermediate frequency signal; a local oscillator for generating a local oscillation signal in transmission and reception; an up-mixer for combining the transmission intermediate frequency signal with the local frequency signal; a duplexer for processing a radio frequency signal received through an antenna; and a specific frequency removing unit installed between the local oscillator and an up-mixer to remove a specific frequency signal generated from the local oscillator. A filter is installed between the local oscillator and the up-mixer to remove the 2-times frequency of the local oscillation signal of 957.66 MHz, thereby removing the self-quieting phenomenon generated in the channel 76 of AMPS.Type: ApplicationFiled: June 21, 2002Publication date: December 26, 2002Applicant: LG Electronics Inc.Inventor: Jeong-Hyun Cho