Patents by Inventor Seok Chung

Seok Chung 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).

  • Host unit and remote radio head for distributed antenna system supporting large data traffic
    Patent number: 10020890
    Abstract: A remote radio head disposed between a baseband unit and a host unit. The remote radio head may transmit and receive a digital optical signal to the baseband unit, transmit and receive an analog optical signal to the host unit, and convert the digital optical signal and the analog optical signal, a frequency of the analog optical signal transmitted and received by the remote radio head and the host unit may be an intermediate frequency of a baseband, the host unit may be disposed between the remote radio head and a radio unit, the host unit and the radio unit may transmit and receive the analog optical signal, and the frequency of the analog optical signal transmitted and received by the host unit and the radio unit may be the intermediate frequency with a baseband signal.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: July 10, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seung-Hyun Cho, Hwan Seok Chung, Minkyu Sung, Jong Hyun Lee
  • Microfluidic circuit element comprising microfluidic channel with nano interstices and fabrication method thereof
    Patent number: 10005082
    Abstract: A microfluidic circuit element comprising a microfluidic main channel and nano interstices is disclosed. The nano interstices are formed at both sides of the main channel and are in fluid communication with the main channel. The nano interstices have a height less than that of the main channel, gives more driving force of the microfluidic channel and provides stable flow of a fluid. The microfluidic circuit element may be made from a plastic material having a contact angle of 90 degrees or less. The microfluidic circuit element is particularly useful when filling a liquid sample to the channel which is empty or filled with air and shows greatly improved a storage stability.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: June 26, 2018
    Assignee: INCYTO CO., LTD.
    Inventors: Sin Kil Cho, Seok Chung
  • Bidirectional optical element
    Patent number: 10003427
    Abstract: A bidirectional optical element in optical network units (ONUs) of a passive optical network (PON) includes a main filter configured to pass an upstream signal having an upstream-channel wavelength and a downstream signal having a downstream-channel wavelength, a drop filter configured to pass the downstream signal having the downstream-channel wavelength and reject the upstream signal having the upstream-channel wavelength, and an add filter configured to pass the upstream signal having the upstream-channel wavelength and reject the downstream signal having the downstream-channel wavelength, wherein the main filter, the drop filter, and the add filter are configured to share a single optical waveguide, and the optical waveguide is configured to connect input ports of the main filter and the drop filter and an output port of the drop filter and is provided in a straight line shape.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: June 19, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Heuk Park, Hwan Seok Chung
  • Passive optical network (PON) supporting fragmentation function of media access control (MAC) frame
    Patent number: 9998808
    Abstract: An optical line terminal (OLT) and an optical network unit (ONU) configured to generate a plurality of fragments by fragmenting a media access control (MAC) frame and to transmit the plurality of generated fragments, when a length of the MAC frame is greater than or equal to a maximum transmission unit (MTU).
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: June 12, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kwang Ok Kim, Hwan Seok Chung
  • Optical signal transmission system and method of allocating center frequencies of intermediate frequency (IF) carriers for frequency division multiplexing (FDM) optical fiber link
    Patent number: 9998222
    Abstract: An optical signal transmission system and method of allocating center frequencies of intermediate frequency (IF) carriers in a frequency division multiplexing (FDM) optical fiber link. The optical signal transmission method includes determining a center frequency interval between modulated signals based on a bandwidth of the modulated signals or a center frequency of a modulated signal having a lowest center frequency, among the modulated signals, reallocating center frequencies to the modulated signals based on the center frequency interval between the modulated signals, and converting the modulated signals reallocated the center frequencies from electrical signal into optical signal and transmitting the optical signal.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: June 12, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Chan Gyo Han, Min Kyu Sung, Jong Hyun Lee, Hwan Seok Chung, Seung Hyun Cho
  • HOST UNIT AND REMOTE RADIO HEAD FOR DISTRIBUTED ANTENNA SYSTEM SUPPORTING LARGE DATA TRAFFIC
    Publication number: 20180152246
    Abstract: A remote radio head disposed between a baseband unit and a host unit. The remote radio head may transmit and receive a digital optical signal to the baseband unit, transmit and receive an analog optical signal to the host unit, and convert the digital optical signal and the analog optical signal, a frequency of the analog optical signal transmitted and received by the remote radio head and the host unit may be an intermediate frequency of a baseband, the host unit may be disposed between the remote radio head and a radio unit, the host unit and the radio unit may transmit and receive the analog optical signal, and the frequency of the analog optical signal transmitted and received by the host unit and the radio unit may be the intermediate frequency with a baseband signal.
    Type: Application
    Filed: July 3, 2017
    Publication date: May 31, 2018
    Inventors: Seung-Hyun CHO, Hwan Seok CHUNG, Minkyu SUNG, Jong Hyun LEE
  • HOST UNIT AND RADIO UNIT FOR DISTRIBUTED ANTENNA SYSTEM SUPPORTING LARGE DATA TRAFFIC
    Publication number: 20180152244
    Abstract: A host unit is provided between a remote radio head and a radio unit. The host unit performs a conversion between a digital optical signal used by the remote radio head and an analog optical signal used by the radio unit. A frequency of the analog optical signal converted by the host unit may be an intermediate frequency. The radio unit performs a conversion between an analog optical signal used by the host unit and an analog radio signal used by a user terminal. A frequency of the analog radio signal may be included in a millimeter wave band or radio frequency band.
    Type: Application
    Filed: November 28, 2017
    Publication date: May 31, 2018
    Inventors: Seung-Hyun CHO, Hwan Seok CHUNG, Minkyu SUNG, Jong Hyun LEE
  • OPTICAL NETWORK SYSTEM USING WAVELENGTH CHANNELS INCLUDED IN O-BAND
    Publication number: 20180123723
    Abstract: Wavelength channels used in the optical network system are classified into downstream channels used to transmit optical signals from an optical line terminal (OLT) to an optical network unit (ONU) and upstream channels that are used to transmit optical signals from the ONU to the OLT. The wavelength channels are included in an O-band and may not overlap each other. One of the upstream channels are allocated to a wavelength band (for example, a zero-dispersion window) in which a four-wave mixing occurs. A wavelength spacing between the upstream channels and the downstream channels is determined based on a performance of separating the upstream channels and the downstream channels in a bidirectional optical sub assembly (BOSA) of the ONU. Also, a wavelength spacing between the downstream channels is determined based on a performance of separating the downstream channels in the BOSA.
    Type: Application
    Filed: October 31, 2017
    Publication date: May 3, 2018
    Inventors: Han Hyub LEE, Heuk PARK, Hwan Seok CHUNG
  • Memory apparatuses having ground switches
    Patent number: 9928892
    Abstract: A resistive memory apparatus includes a memory cell array having a plurality of memory cells and a first ground switch. The plurality of memory cells are arranged in a plurality of rows and a plurality of columns, and each memory cell in a first column of the plurality of memory cells is connected between a first bitline and a first source line. The first ground switch is connected in parallel with the first source line, and the first ground switch is configured to selectively provide a first current path from the first bitline to ground through a selected memory cell in the first column of the plurality of memory cells and the first source line, the current path traversing only a portion of the first source line.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: March 27, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Bo-young Seo, Yong-seok Chung, Gwan-hyeob Koh, Yong-kyu Lee
  • OPTICAL SIGNAL RECEIVING APPARATUS FOR RECEIVING OPTICAL SIGNAL IN BURST MODE
    Publication number: 20180062762
    Abstract: An optical signal receiving apparatus included in an optical line terminal (OLT) includes a resistor disposed between a capacitor connected to a receiving optical sub-assembly (ROSA) and a limiting amplifier, wherein a resistance value of the resistor may be determined based on the OLT receives an optical signal from an optical network unit (ONU) and whether the ONU transmitting the optical signal to the OLT is switched, the resistance value of the resistor may be determined to reduce a data loss occurring from the optical signal receiving apparatus in response to the OLT receiving the optical signal from the ONU, and the resistance value of the resistor may be determined such that the optical signal receiving apparatus more rapidly follows a change in intensity of the optical signal in response to the ONU transmitting the optical signal to the OLT being switched.
    Type: Application
    Filed: August 24, 2017
    Publication date: March 1, 2018
    Inventors: Sil Gu MUN, Hwan Seok CHUNG
  • Liquid crystal display device including reinforcing frame
    Patent number: 9904082
    Abstract: Disclosed is a curved display device that may include a display panel having a curvature between a top frame and a bottom frame; a printed circuit board (PCB) electrically connected to at least one edge portion of the display panel where driving circuits and signal lines are provided through a connector; and a reinforcing frame that supports a rear surface of the bottom frame, the reinforcing frame including a reinforcing bar substantially following the curvature of the display panel, wherein the reinforcing bar has a step to include first and second rear surfaces, with the first rear surface being closer to the display panel than the second rear surface, and wherein the PCB is mounted on the first rear surface of the reinforcing bar.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: February 27, 2018
    Assignee: LG DISPLAY CO., LTD.
    Inventors: Se-Min Lee, Bum-Seok Chung, Dae-Hun Lee, Tae-Hyung Kim, Hyo-Sung Lee
  • Flexible printed circuit board for optical module
    Patent number: 9900991
    Abstract: A flexible printed circuit board (FPCB) for an optical module includes: a signal via pad connected with a signal lead pin of the optical module; a ground layer spaced apart from the signal via pad; an isolation gap formed between the signal via pad and the ground layer; and a protective layer which is formed at a portion that comprises the isolation gap, and which, when connected with the signal via pad, compensates for parasitic inductance caused by a protruding signal lead pin.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: February 20, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sae Kyoung Kang, Heuk Park, Hwan Seok Chung
  • PASSIVE OPTICAL NETWORK RECEIVING AND TRANSMITTING FRAME USING MULTIPLE LANES
    Publication number: 20180035183
    Abstract: A method of registering an optical network unit (ONU) in an optical line terminal (OLT). The OLT determines a lane to be used by the ONU based on a transmission rate supported by the ONU, combines or distributes data of a dataflow based on a rate of the lane by comparing the rate of the lane to a rate of the dataflow of a media access control (MAC) client interface, and, when the OLT and the ONU are connected through multiple lanes, transmits and receives data between the OLT and the ONU through channel bonding for more effective use of a network.
    Type: Application
    Filed: January 5, 2017
    Publication date: February 1, 2018
    Inventors: Kwang Ok KIM, Kyeong Hwan DOO, Hwan Seok CHUNG
  • MAGNETORESISTIVE RANDOM ACCESS MEMORY DEVICE AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20180012933
    Abstract: A method of manufacturing an MRAM device includes sequentially forming a first insulating interlayer and an etch-stop layer on a substrate. A lower electrode is formed through the etch-stop layer and the first insulating interlayer. An MTJ structure layer and an upper electrode are sequentially formed on the lower electrode and the etch-stop layer. The MTJ structure layer is patterned by a physical etching process using the upper electrode as an etching mask to form an MTJ structure at least partially contacting the lower electrode. The first insulating interlayer is protected by the etch-stop layer so not to be etched by the physical etching process.
    Type: Application
    Filed: September 21, 2017
    Publication date: January 11, 2018
    Inventors: Ki-Seok SUH, Jae-Chul SHIM, Kil-Ho LEE, Yong-Seok CHUNG, Gwan-Hyeob KOH, Yoon-Jong SONG
  • METHOD FOR FORMING A HARD MASK PATTERN AND METHOD FOR MANUFACTURING A SEMICONDUCTOR DEVICE USING THE SAME
    Publication number: 20180013060
    Abstract: The inventive concepts provide a method for forming a hard mask pattern. The method includes forming a hard mask layer on an etch target layer disposed on a substrate, forming a photoresist pattern having an opening exposing one region of the hard mask layer, performing an oxygen ion implantation process on the one region using the photoresist pattern as a mask to form an oxidized portion in the one region, and patterning the hard mask layer using the oxidized portion as an etch mask.
    Type: Application
    Filed: September 14, 2017
    Publication date: January 11, 2018
    Inventors: Yong-Seok CHUNG, YOONJONG SONG, YONGKYU LEE, GWANHYEOB KOH
  • Magnetoresistive random access memory device and method of manufacturing the same
    Patent number: 9853087
    Abstract: A method of manufacturing an MRAM device includes sequentially forming a first insulating interlayer and an etch-stop layer on a substrate. A lower electrode is formed through the etch-stop layer and the first insulating interlayer. An MTJ structure layer and an upper electrode are sequentially formed on the lower electrode and the etch-stop layer. The MTJ structure layer is patterned by a physical etching process using the upper electrode as an etching mask to form an MTJ structure at least partially contacting the lower electrode. The first insulating interlayer is protected by the etch-stop layer so not to be etched by the physical etching process.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: December 26, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ki-Seok Suh, Jae-Chul Shim, Kil-Ho Lee, Yong-Seok Chung, Gwan-Hyeob Koh, Yoon-Jong Song
  • Phase error compensating apparatus
    Patent number: 9804327
    Abstract: Provided is a phase error compensating apparatus. The phase error compensating apparatus may include a waveguide array disposed between a first free propagation region and a second free propagation region and configured to allow a light signal passed through the first free propagation region to move toward the second free propagation region, in which a length of each of the waveguides included in the waveguide array may be adjusted to compensate for a phase error of light signals passed through the waveguides.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: October 31, 2017
    Assignee: ELECTRONICS AND TELECOMUNICATIONS RESEARCH INSTITUTE
    Inventors: Heuk Park, Sae Kyoung Kang, Hwan Seok Chung
  • APPARATUS FOR MEASURING FLUID SPEED
    Publication number: 20170307649
    Abstract: An apparatus for measuring fluid speed by using the refraction of light is disclosed. The apparatus includes: a channel in which a passage is formed to allow the flow of a fluid; a first and a second light source that are located in any one region of an upper part and a lower part of the channel; a sensor installed in an opposite region of the region where the first and second light sources are located with respect to the channel, to receive the light emitted from the first and second light sources; a speed calculation unit that calculates the speed of the fluid by using a time point at which the intensity of the light received at the sensor changes; and an adjustment unit that is connected to the channel and configured to adjust the flow speed of the fluid based on the calculated speed of the fluid.
    Type: Application
    Filed: June 24, 2015
    Publication date: October 26, 2017
    Inventors: Seok CHUNG, Eun Doo LEE, Jung Hyo YOON, Se Woon HAN, Jae Ho KIM, Young Kyu CHO, David LIM, Yong Hun JUNG, Dong June AHN
  • APPARATUS FOR MEASURING FLUID SPEED
    Publication number: 20170307650
    Abstract: An apparatus for measuring fluid speed by using the refraction of light is disclosed. The apparatus includes: a channel in which a passage is formed to allow the flow of a fluid; a first and a second light source that are located in any one region of an upper part and a lower part of the channel; a sensor installed in an opposite region of the region where the first and second light sources are located with respect to the channel, to receive the light emitted from the first and second light sources; a speed calculation unit configured to calculate a speed of the fluid by using the intensity of the light received at the sensor.
    Type: Application
    Filed: June 24, 2015
    Publication date: October 26, 2017
    Inventors: Seok CHUNG, Jung Hyo YOON, Eun Doo LEE, Se Woon HAN, Jae Ho KIM, Young Kyu CHO, David LIM, Yong Hun JUNG, Seung Hun HONG
  • Method for forming a hard mask pattern and method for manufacturing a semiconductor device using the same
    Patent number: 9793472
    Abstract: The inventive concepts provide a method for forming a hard mask pattern. The method includes forming a hard mask layer on an etch target layer disposed on a substrate, forming a photoresist pattern having an opening exposing one region of the hard mask layer, performing an oxygen ion implantation process on the one region using the photoresist pattern as a mask to form an oxidized portion in the one region, and patterning the hard mask layer using the oxidized portion as an etch mask.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: October 17, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yong-Seok Chung, Yoonjong Song, Yongkyu Lee, Gwanhyeob Koh