Patents by Inventor Kwan Hee Han
Kwan Hee Han 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: 10899915Abstract: Disclosed is a wax-based thermoplastic organic binder composition consisting of: 50 to 94 wt % of a wax mixture comprising paraffin wax and microcrystalline wax; 3 to 35 wt % of a polyolefin copolymer having a carbonyl group as a backbone polymer; and 3 to 15 wt % of a process control agent.Type: GrantFiled: November 7, 2016Date of Patent: January 26, 2021Assignee: Research Cooperation Foundation of Yeungnam UniversityInventor: Kwan Hee Han
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Patent number: 10626017Abstract: A method of synthesizing aluminum nitride, the method includes: preparing mixed powder containing 0.5 to 8 wt % of zinc powder, 0.01 to 2 wt % of magnesium powder, 0.01 to 1 wt % of silicon powder, 0.01 to 1 wt % of copper powder, and a balanced amount of aluminum powder; preparing a feedstock of the mixed powder blended and filled with thermoplastic organic binder, by pressured kneading the mixed powder and the thermoplastic organic binder; forming granules of the feedstock by crushing the feedstock or forming a molded body of the feedstock via a powder molding method; and debinding the granules or the molded body by heating under a nitrogen gas atmosphere, and then performing direct nitridation between aluminum and a nitrogen gas at a temperature higher than a debinding temperature.Type: GrantFiled: November 29, 2016Date of Patent: April 21, 2020Assignee: Research Cooperation Foundation of Yeungnam UniversityInventors: Kwan Hee Han, Ju Hyun Kim
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Publication number: 20190010053Abstract: A method of synthesizing aluminum nitride, the method includes: preparing mixed powder containing 0.5 to 8 wt % of zinc powder, 0.01 to 2 wt % of magnesium powder, 0.01 to 1 wt % of silicon powder, 0.01 to 1 wt % of copper powder, and a balanced amount of aluminum powder; preparing a feedstock of the mixed powder blended and filled with thermoplastic organic binder, by pressured kneading the mixed powder and the thermoplastic organic binder; forming granules of the feedstock by crushing the feedstock or forming a molded body of the feedstock via a powder molding method; and debinding the granules or the molded body by heating under a nitrogen gas atmosphere, and then performing direct nitridation between aluminum and a nitrogen gas at a temperature higher than a debinding temperature.Type: ApplicationFiled: November 29, 2016Publication date: January 10, 2019Applicant: Research Cooperation Foundation of Yeungnam UniversityInventors: Kwan Hee HAN, Ju Hyun KIM
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Publication number: 20180327579Abstract: Disclosed is a wax-based thermoplastic organic binder composition consisting of: 50 to 94 wt % of a wax mixture comprising paraffin wax and microcrystalline wax; 3 to 35 wt % of a polyolefin copolymer having a carbonyl group as a backbone polymer; and 3 to 15 wt % of a process control agent.Type: ApplicationFiled: November 7, 2016Publication date: November 15, 2018Applicant: Research Cooperation Foundation of Yeungnam Univer sityInventor: Kwan Hee HAN
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Publication number: 20180304373Abstract: A powder molding method of aluminum and aluminum alloy includes: preparing a feedstock by kneading aluminum powder, aluminum alloy powder, or aluminum composite powder containing a reinforcing material with a thermoplastic organic binder; molding the feedstock to a product having a complex shape via powder injection molding, compression molding, or extrusion molding; and then producing a high-density sintered body having relative density of at least 96% by performing debinding and sintering in a single heating process under an argon gas atmosphere.Type: ApplicationFiled: October 20, 2016Publication date: October 25, 2018Applicant: Research Cooperation Foundation of Yeungnam UniversityInventors: Kwan Hee HAN, Han-Sol LEE
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Patent number: 10052077Abstract: A tomography imaging apparatus and a tomography imaging method are provided. The tomography imaging apparatus includes a data acquirer configured to acquire first X-ray data of an object for each of energy bands, and an image preprocessor configured to perform a beam hardening correction on the first X-ray data for each of the energy bands, to generate second X-ray data of the object. The tomography imaging apparatus further includes an image reconstructor configured to reconstruct a tomography image of the object based on the second X-ray data.Type: GrantFiled: January 20, 2016Date of Patent: August 21, 2018Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jin-wook Jung, Toshihiro Rifu, Min-kook Cho, Eun-ji Seo, Kwan-hee Han
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Patent number: 9407360Abstract: Disclosed is an optical line monitoring system and method which detects an optical line where a disorder occurs, by using an OTDR (Optical Time Domain Reflectometer) pulse pattern with matching information. The optical line monitoring system generates and stores a reference OTDR pulse pattern matched with identification information of an optical channel service unit, and compares the matched reference OTDR pulse pattern with the OTDR pulse pattern collected at an inspection time to verify an optical line region where a disorder occurs.Type: GrantFiled: October 10, 2012Date of Patent: August 2, 2016Assignee: LS CABLE LTD.Inventors: Ji-Sang Park, Lae-Hyuk Park, Ki-Yeul Kim, Kwan-Hee Han, Eun-Jeong Yang
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Publication number: 20160206269Abstract: A tomography imaging apparatus and a tomography imaging method are provided. The tomography imaging apparatus includes a data acquirer configured to acquire first X-ray data of an object for each of energy bands, and an image preprocessor configured to perform a beam hardening correction on the first X-ray data for each of the energy bands, to generate second X-ray data of the object. The tomography imaging apparatus further includes an image reconstructor configured to reconstruct a tomography image of the object based on the second X-ray data.Type: ApplicationFiled: January 20, 2016Publication date: July 21, 2016Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jin-wook Jung, Toshihiro Rifu, Min-kook Cho, Eun-ji Seo, Kwan-hee Han
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Publication number: 20140308033Abstract: Disclosed is an optical line monitoring system and method which detects an optical line where a disorder occurs, by using an OTDR (Optical Time Domain Reflectometer) pulse pattern with matching information. The optical line monitoring system generates and stores a reference OTDR pulse pattern matched with identification information of an optical channel service unit, and compares the matched reference OTDR pulse pattern with the OTDR pulse pattern collected at an inspection time to verify an optical line region where a disorder occurs.Type: ApplicationFiled: October 10, 2012Publication date: October 16, 2014Inventors: Ji-Sang Park, Lae-Hyuk Park, Ki-Yeul Kim, Kwan-Hee Han, Eun-Jeong Yang
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Patent number: 8131153Abstract: A communication equipment which is utilized in a power line communication (PLC) system utilizing a hybrid fiber coax (HFC) which includes a PLC optical network unit, a PLC trunk bridge amplifier, a PLC distribution amplifier, and a PLC coupling device. In this instance, the PLC optical network unit does not require a PLC protocol conversion of an Ethernet signal by a cable modem and a PLC modem in each subscriber location, and enables a PLC communication between the each subscriber location and a communication terminal utilizing a PLC Ethernet signal as is, by receiving an optical signal from an optical transmitter via an optical fiber, converting the optical signal into the PLC Ethernet signal corresponding to a predetermined PLC protocol, and transmitting the PLC Ethernet signal to at least one subscriber location via a coaxial cable.Type: GrantFiled: November 29, 2006Date of Patent: March 6, 2012Assignee: LS Cable Ltd.Inventors: Dong Young Park, Kwan Hee Han, Sung Wook Moon, Hyung Suk Choi, Wan Yoon Lee
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Patent number: 7848643Abstract: A communication recovering system for a wavelength division multiplexed passive optical network (WDM PON) includes a central office and remote nodes. When there is a fault in an optical fiber connecting a first blue/red band coupler to a blue/red band coupler R11, optical signals are inputted/outputted thereto/therefrom through a first 1×2 optical switch and a second blue/red band coupler, and when there is a fault in an optical fiber connecting the second blue/red band coupler to a blue/red band coupler R21, optical signals are inputted/outputted thereto/therefrom through the second 1×2 optical switch and the first blue/red band coupler.Type: GrantFiled: July 6, 2009Date of Patent: December 7, 2010Assignee: Korea Advanced Institute of Science and TechnologyInventors: Yun Chur Chung, Eui Seung Son, Kyung Woo Lim, Kwan Hee Han
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Publication number: 20090290866Abstract: A communication recovering system for a wavelength division multiplexed passive optical network (WDM PON). The communication recovering system can recover fault of optical fibers between the central office and the remote nodes without additional optical fibers by grouping two remote nodes and employing an AWG having periodic transmission characteristics, and can also simply and rapidly recover such a fault with minimal optical loss using an AWG of 2×N structure and an On-Off optical switch, although protection optical fibers are additionally installed therein. The system can rapidly recover fault of optical fibers between a local office and optical network units, 1:N manner, using 2×2 optical switches, which are installed to each of the optical network units, a reserved transmitter and receiver, and a transceiver.Type: ApplicationFiled: July 6, 2009Publication date: November 26, 2009Applicant: Korea Advanced Institute of Science and TechnologyInventors: Yun Chur Chung, Eui Seung Son, Kyung Woo Lim, Kwan Hee Han
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Patent number: 7558477Abstract: A communication recovering system for a wavelength division multiplexed passive optical network (WDM PON). The communication recovering system can recover fault of optical fibers between the central office and the remote nodes without additional optical fibers by grouping two remote nodes and employing AWGs having periodic transmission characteristics, and can also simply and rapidly recover such a fault with minimal optical loss using 1×N structure of the AWGs and On-Off optical switches, although protection optical fibers are additionally installed therein. The communication recovering system has advantages in that it can simplify network structure, be cost-effectively implemented, reduce optical loss, and rapidly perform protection of optical fiber fault.Type: GrantFiled: October 28, 2005Date of Patent: July 7, 2009Assignee: Korea Advanced Institute of Science and TechnologyInventors: Yun Chur Chung, Eui Seung Son, Kyung Woo Lim, Kwan Hee Han
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Patent number: 7542673Abstract: A fault localization apparatus for an optical line in a wavelength division multiplexed passive optical network is disclosed. The apparatus can detect light loss and fault positions as a channel exhibiting an abnormal receiving state of signals received by each of the upstream receivers is checked, and a monitoring optical signal is used, in which the monitoring optical signal is generated as a pulse is inputted to a light source of the downstream transmitter corresponding to the channel showing such an abnormal receiving state. The apparatus according to the present invention can detect fault positions of optical lines between the central office and the remote nodes and between the remote nodes and the optical network units, since the light source of downstream channel in which faults occur is used as a monitoring light source. The apparatus according to the present invention can be cost-effectively implemented.Type: GrantFiled: November 1, 2005Date of Patent: June 2, 2009Assignee: Korea Advanced Institute of Science and TechnologyInventors: Yun Chur Chung, Eui Seung Son, Kyung Woo Lim, Kwan Hee Han
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Publication number: 20080317472Abstract: A communication equipment which is utilized in a power line communication (PLC) system utilizing a hybrid fiber coax (HFC) which includes a PLC optical network unit, a PLC trunk bridge amplifier, a PLC distribution amplifier, and a PLC coupling device. In this instance, the PLC optical network unit does not require a PLC protocol conversion of an Ethernet signal by a cable modem and a PLC modem in each subscriber location, and enables a PLC communication between the each subscriber location and a communication terminal utilizing a PLC Ethernet signal as is, by receiving an optical signal from an optical transmitter via an optical fiber, converting the optical signal into the PLC Ethernet signal corresponding to a predetermined PLC protocol, and transmitting the PLC Ethernet signal to at least one subscriber location via a coaxial cable.Type: ApplicationFiled: November 29, 2006Publication date: December 25, 2008Inventors: Dong Young Park, Kwan Hee Han, Sung Wook Moon, Hyung Suk Choi, Wan Yoon Lee
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Publication number: 20080279199Abstract: A lock device having a lever is disclosed, in which the lever is released to rotate a latch bolt only if a correct electronic key is authenticated while the latch bolt is hooked over the lever at normal times.Type: ApplicationFiled: November 29, 2006Publication date: November 13, 2008Inventors: Dong Young Park, Kwan Hee Han, Sung Wook Moon, Hyung Suk Choi
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Publication number: 20070206658Abstract: A wireless network transmission system using a power line communication (PLC), which can connect at least one ultra-wideband (UWB) network by using a UWB relay and support communication between different UWB networks. The wireless network transmission system using a PLC includes: a first pico-net including at least one device generating a UWB data signal; a UWB relay unit transforming the UWB data signal into a PLC data signal; and a power line unit mechanically connecting the first pico-net and a second pico-net, and transmitting the transformed PLC data signal to the second pico-net.Type: ApplicationFiled: October 4, 2006Publication date: September 6, 2007Inventors: Sae-Rom Park, Ki-Yeul Kim, Kwan Hee Han