Patents by Inventor Keum-Cheol Hwang
Keum-Cheol Hwang 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: 20240150671Abstract: Provided is a lubricating oil composition including a lubricating oil additive and a lubricating oil, the lubricating oil additive having nanodiamonds, of which a surface is hydrophobically modified by a surface treatment, dispersed in a base oil. The lubricating oil composition retains dispersibility over a long period of time and thus can ensure storage stability. Machines to which the lubricating oil composition is applied may have improved abrasion resistance as well as improved fuel consumption and reduced noise, and high thermal conductivity of the lubricating oil composition may also increase cooling efficiency and the service life of machines.Type: ApplicationFiled: January 4, 2024Publication date: May 9, 2024Applicant: KONASOL CO., LTD.Inventors: Yeon Joo BAE, Keum Cheol HWANG, Im Joo CHOI
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Publication number: 20240047850Abstract: A laminated glass antenna structure includes: a lower glass sheet including a first surface facing inside and a second surface at the upper end thereof; an upper glass sheet including a third surface adjacent to the lower glass sheet; an adhesive film positioned between the upper glass sheet and the lower glass sheet; and an antenna unit including a plurality of microstrip patch unit cells provided on the second surface and the third surface with respect to a ground plane provided on the first surface.Type: ApplicationFiled: December 22, 2022Publication date: February 8, 2024Applicants: HYUNDAI MOTOR COMPANY, KIA CORPORATION, Hongik University Industry-Academia Cooperation FoundationInventors: Nak Kyoung Kong, Dae Hee Lee, Jong Min Park, Ki Hong Lee, Jong Seon Lee, Oh Heon Kwon, Keum Cheol Hwang, Ho Sung Choo
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Patent number: 11894614Abstract: An antenna apparatus includes: a ground plane including first sides parallel to a first direction and second sides parallel to a second direction, on a plane formed in the first and second directions; a dielectric layer disposed on the ground plane in a third direction; an antenna patch overlapping the ground plane in the third direction; and vias connected to the ground plane and passing through at least a portion of the dielectric layer. Edges of the vias at least partially overlap the first sides of the ground plane in the third direction.Type: GrantFiled: April 15, 2021Date of Patent: February 6, 2024Assignees: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Won Wook So, Jeongki Ryoo, Woncheol Lee, Youngsik Hur, Keum Cheol Hwang, Nam Heung Kim, Yong-serk Kim
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Publication number: 20240026244Abstract: Provided is a lubricating oil composition including a lubricating oil additive and a lubricating oil, the lubricating oil additive having nanodiamonds, of which a surface is hydrophobically modified by a surface treatment, dispersed in a base oil. The lubricating oil composition retains dispersibility over a long period of time and thus can ensure storage stability. Machines to which the lubricating oil composition is applied may have improved abrasion resistance as well as improved fuel consumption and reduced noise, and high thermal conductivity of the lubricating oil composition may also increase cooling efficiency and the service life of machines.Type: ApplicationFiled: August 29, 2022Publication date: January 25, 2024Applicant: KONASOL CO., LTD.Inventors: Yeon Joo BAE, Keum Cheol HWANG, Im Joo CHOI
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Patent number: 11866672Abstract: Provided is a lubricating oil composition including a lubricating oil additive and a lubricating oil, the lubricating oil additive having nanodiamonds, of which a surface is hydrophobically modified by a surface treatment, dispersed in a base oil. The lubricating oil composition retains dispersibility over a long period of time and thus can ensure storage stability. Machines to which the lubricating oil composition is applied may have improved abrasion resistance as well as improved fuel consumption and reduced noise, and high thermal conductivity of the lubricating oil composition may also increase cooling efficiency and the service life of machines.Type: GrantFiled: August 29, 2022Date of Patent: January 9, 2024Assignee: KONASOL CO., LTD.Inventors: Yeon Joo Bae, Keum Cheol Hwang, Im Joo Choi
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Patent number: 11641065Abstract: An antenna device is provided. The antenna device includes a first antenna patch configured to transmit and receive an RF signal in a first frequency bandwidth and disposed a first dielectric layer; a second antenna patch disposed on a second dielectric layer and coupled to the first antenna patch; a third antenna patch disposed on a third dielectric layer and coupled to the second antenna patch; and a fourth antenna patch configured to transmit and receive an RF signal in the second frequency bandwidth, wherein the second antenna patch includes a plurality of first sub-antenna patches that do not overlap the first antenna patch, and the third antenna patch includes a plurality of second sub-antenna patches that overlap the first sub-antenna patches.Type: GrantFiled: June 29, 2021Date of Patent: May 2, 2023Assignees: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Won Wook So, Jeongki Ryoo, Woncheol Lee, Youngsik Hur, Keum Cheol Hwang, Nam Heung Kim, Yong-Serk Kim
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Publication number: 20220166149Abstract: An antenna device is provided. The antenna device includes a first antenna patch configured to transmit and receive an RF signal in a first frequency bandwidth and disposed a first dielectric layer; a second antenna patch disposed on a second dielectric layer and coupled to the first antenna patch; a third antenna patch disposed on a third dielectric layer and coupled to the second antenna patch; and a fourth antenna patch configured to transmit and receive an RF signal in the second frequency bandwidth, wherein the second antenna patch includes a plurality of first sub-antenna patches that do not overlap the first antenna patch, and the third antenna patch includes a plurality of second sub-antenna patches that overlap the first sub-antenna patches.Type: ApplicationFiled: June 29, 2021Publication date: May 26, 2022Applicants: SAMSUNG ELECTRO-MECHANICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Won Wook SO, Jeongki RYOO, Woncheol LEE, Youngsik HUR, Keum Cheol HWANG, Nam Heung KIM, Yong-serk KIM
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Patent number: 11316281Abstract: An antenna apparatus may include: a feed via; a patch antenna pattern electrically connected to the feed via; and coupling patterns spaced apart from the patch antenna pattern and spaced apart from each other. At least one of the coupling patterns may protrude in a direction in which the at least one of the coupling patterns is spaced apart from the patch antenna pattern.Type: GrantFiled: October 24, 2019Date of Patent: April 26, 2022Assignees: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Myeong Woo Han, Dae Ki Lim, Keum Cheol Hwang, Sung Woo Lee, Jeong Ki Ryoo
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Publication number: 20220123479Abstract: An antenna apparatus includes: a ground plane including first sides parallel to a first direction and second sides parallel to a second direction, on a plane formed in the first and second directions; a dielectric layer disposed on the ground plane in a third direction; an antenna patch overlapping the ground plane in the third direction; and vias connected to the ground plane and passing through at least a portion of the dielectric layer. Edges of the vias at least partially overlap the first sides of the ground plane in the third direction.Type: ApplicationFiled: April 15, 2021Publication date: April 21, 2022Applicants: SAMSUNG ELECTRO-MECHANICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Won Wook SO, Jeongki RYOO, Woncheol LEE, Youngsik HUR, Keum Cheol HWANG, Nam Heung KIM, Yong-serk KIM
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Patent number: 11283175Abstract: An antenna apparatus includes a ground plane; first and second patch antenna patterns disposed above and spaced apart from a first surface of the ground plane and from each other; a second feed via to provide a second feed path of the second patch antenna pattern, and disposed adjacent to an edge of the second patch antenna pattern; a first feed via to provide a first feed path of the first patch antenna pattern, and disposed adjacent to an edge of the first patch antenna pattern that is opposite to the second patch antenna pattern; a first coupling pattern disposed between the first patch antenna pattern and the second patch antenna pattern along the first direction; a ground via; and a second coupling pattern disposed between the second patch antenna pattern and the first coupling pattern along the first direction.Type: GrantFiled: March 18, 2020Date of Patent: March 22, 2022Assignees: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Myeong Woo Han, Nam Ki Kim, Young Sik Hur, Yong Serk Kim, Keum Cheol Hwang, Nam Heung Kim, Jeong Ki Ryoo
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Patent number: 11121477Abstract: An antenna apparatus includes a ground plane; first and second patch antenna patterns disposed above and spaced apart from the ground plane, and spaced apart from each other; a first feed via providing a first feed path of the first patch antenna pattern through a first point disposed adjacent to an edge of the first patch antenna pattern in a direction spaced apart from the second patch antenna pattern; a second feed via providing a second feed path of the second patch antenna pattern through a second point disposed adjacent to an edge of the second patch antenna pattern in a direction spaced apart from the first patch antenna pattern; and a first coupling pattern spaced apart from the first and second patch antenna patterns between the first and second patch antenna patterns, and defining a first internal space exposed towards the first patch antenna pattern.Type: GrantFiled: February 26, 2020Date of Patent: September 14, 2021Assignees: SAMSUNG ELECTRO-MECHANICS CO., LTD., RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITYInventors: Myeong Woo Han, Dae Ki Lim, Yong Serk Kim, Keum Cheol Hwang, Nam Heung Kim, Won Cheol Lee, Young Sik Hur
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Publication number: 20210151889Abstract: An antenna apparatus includes a ground plane; first and second patch antenna patterns disposed above and spaced apart from a first surface of the ground plane and from each other; a second feed via to provide a second feed path of the second patch antenna pattern, and disposed adjacent to an edge of the second patch antenna pattern; a first feed via to provide a first feed path of the first patch antenna pattern, and disposed adjacent to an edge of the first patch antenna pattern that is opposite to the second patch antenna pattern; a first coupling pattern disposed between the first patch antenna pattern and the second patch antenna pattern along the first direction; a ground via; and a second coupling pattern disposed between the second patch antenna pattern and the first coupling pattern along the first direction.Type: ApplicationFiled: March 18, 2020Publication date: May 20, 2021Applicants: SAMSUNG ELECTRO-MECHANICS CO., LTD., Research & Business Foundation Sungkyunkwan UniversityInventors: Myeong Woo HAN, Nam Ki KIM, Young Sik HUR, Yong Serk KIM, Keum Cheol HWANG, Nam Heung KIM, Jeong Ki RYOO
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Publication number: 20210151898Abstract: An antenna apparatus includes a ground plane; first and second patch antenna patterns disposed above and spaced apart from the ground plane, and spaced apart from each other; a first feed via providing a first feed path of the first patch antenna pattern through a first point disposed adjacent to an edge of the first patch antenna pattern in a direction spaced apart from the second patch antenna pattern; a second feed via providing a second feed path of the second patch antenna pattern through a second point disposed adjacent to an edge of the second patch antenna pattern in a direction spaced apart from the first patch antenna pattern; and a first coupling pattern spaced apart from the first and second patch antenna patterns between the first and second patch antenna patterns, and defining a first internal space exposed towards the first patch antenna pattern.Type: ApplicationFiled: February 26, 2020Publication date: May 20, 2021Applicants: Samsung Electro-Mechanics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Myeong Woo HAN, Dae Ki LIM, Yong Serk KIM, Keum Cheol HWANG, Nam Heung KIM, Won Cheol LEE, Young Sik HUR
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Patent number: 10986908Abstract: A case for an electronic device according to the present disclosure meta-groves having different structures and formed symmetrically, asymmetrically, periodically, or non-periodically or meta-patches attached symmetrically, asymmetrically, periodically, or non-periodically at positions where the meta-grooves are formed, thereby improving the performance of antennas. Accordingly, there is an effect that it is possible to usefully use a mobile electronic device including arranged antennas therein even in a 5G environment having a millimeter wave band.Type: GrantFiled: January 9, 2020Date of Patent: April 27, 2021Assignee: Research & Business Foundation Sungkyunkwan UniversityInventor: Keum Cheol Hwang
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Publication number: 20210005982Abstract: An antenna apparatus may include: a feed via; a patch antenna pattern electrically connected to the feed via; and coupling patterns spaced apart from the patch antenna pattern and spaced apart from each other. At least one of the coupling patterns may protrude in a direction in which the at least one of the coupling patterns is spaced apart from the patch antenna pattern.Type: ApplicationFiled: October 24, 2019Publication date: January 7, 2021Applicants: SAMSUNG ELECTRO-MECHANICS CO., LTD., Research & Business Foundation Sungkyunkwan UniversityInventors: Myeong Woo HAN, Dae Ki LIM, Keum Cheol HWANG, Sung Woo LEE, Jeong Ki RYOO
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Publication number: 20200221839Abstract: A case for an electronic device according to the present disclosure meta-groves having different structures and formed symmetrically, asymmetrically, periodically, or non-periodically or meta-patches attached symmetrically, asymmetrically, periodically, or non-periodically at positions where the meta-grooves are formed, thereby improving the performance of antennas. Accordingly, there is an effect that it is possible to usefully use a mobile electronic device including arranged antennas therein even in a 5G environment having a millimeter wave band.Type: ApplicationFiled: January 9, 2020Publication date: July 16, 2020Applicant: Research & Business Foundation Sungkyunkwan UniversityInventor: Keum Cheol HWANG
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Patent number: 10250316Abstract: A method using energy harvesting including receiving, by a relay node, first information signals transmitted from a source node and second information signals transmitted from a destination node, harvesting, by the relay node, energy using energy signals transmitted from the source node while bi-directionally relaying the first information signals and the second information signals; receiving, by the source node, information signals transmitted by the relay node; and receiving, by the destination node, the information signals relayed by the relay node. The source node, the relay node, and the destination node are devices for performing communication in a full-duplex mode.Type: GrantFiled: January 3, 2017Date of Patent: April 2, 2019Assignee: Research & Business Foundation Sungkyunkwan UniversityInventors: Dong In Kim, Keum Cheol Hwang, Jong Ho Moon, Jong Jin Park
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Patent number: 9876440Abstract: Disclosed herein is an active rectifier. The rectifier includes a rectifier unit, a driver unit, and a switching device control circuit unit. The rectifier unit includes first and fourth transistors configured to become conductive when the voltage of an alternating current (AC) input is negative and apply the current of the AC input to a rectifier capacitor, and second and third transistors configured to become conductive when the voltage of the AC input is positive and apply the current of the AC input to the rectifier capacitor. The driver unit outputs first to fourth drive control signals, and drives the first to fourth transistors. The switching device control circuit unit compares the first drive control signal and the second drive control signal with the AC input, and outputs switching device control signals to delay the first to fourth drive control signals based on the extents to delay.Type: GrantFiled: December 29, 2016Date of Patent: January 23, 2018Assignee: Research & Business Foundation Sungkyunkwan UniversityInventors: Kang Yoon Lee, Seong Jin Oh, Youngoo Yang, Keum Cheol Hwang, Young Jun Park, Sang Yun Kim, Byeong Gi Jang, Jung Yeon Kim
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Publication number: 20170310380Abstract: A method using energy harvesting including receiving, by a relay node, first information signals transmitted from a source node and second information signals transmitted from a destination node, harvesting, by the relay node, energy using energy signals transmitted from the source node while bi-directionally relaying the first information signals and the second information signals; receiving, by the source node, information signals transmitted by the relay node; and receiving, by the destination node, the information signals relayed by the relay node. The source node, the relay node, and the destination node are devices for performing communication in a full-duplex mode.Type: ApplicationFiled: January 3, 2017Publication date: October 26, 2017Applicant: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVE RSITYInventors: Dong In KIM, Keum Cheol HWANG, Jong Ho MOON, Jong Jin PARK
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Patent number: 8248319Abstract: A broadband circularly-polarized spidron fractal antenna is disclosed. The broadband antenna of the present invention can realize a bandwidth exceeding 70% without using a multilayer substrate to implement the broadband properties, by forming a geometric structure of a slot, i.e., a spidron fractal, which has not been used in the conventional antennas, on the ground surface of the antenna. The present invention can also induce the radiation properties of a circularly-polarized wave from the properties of the spidron fractal shape, without employing an additional secondary circuit such as a phase distribution circuit for implementing the circularly-polarized wave. Due to such properties described above, the present invention can implement a small broadband circularly-polarized antenna that costs less to manufacture.Type: GrantFiled: October 14, 2009Date of Patent: August 21, 2012Assignee: Dongguk University Industry-Academic Cooperation FoundationInventor: Keum-Cheol Hwang