Patents by Inventor Chang-Joo Kim

Chang-Joo Kim 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).

  • Publication number: 20220252618
    Abstract: The present invention relates to biomarkers capable of diagnosing various brain and nervous system diseases, and a method of providing information for diagnosing brain and nervous system diseases using the same. According to the present invention, it is possible to diagnose, at an early stage, the onset of a brain and nervous system disease or the likelihood of developing the disease or diagnose the progress or prognosis of the disease or the therapeutic effect against the disease, by measuring the expression level of the biomarker protein of the present invention or a gene encoding the same in the aqueous humor of the eye.
    Type: Application
    Filed: June 10, 2020
    Publication date: August 11, 2022
    Inventors: Yong Bae Kim, Chang Ki Hong, Hyung Keun Lee, Yong Woo Ji, Kwang Pyo Kim, Hyeong Min Lee, Seong Joo Haam
  • Patent number: 9867166
    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: January 9, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Hyun Hwang, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um
  • Patent number: 9635561
    Abstract: The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: April 25, 2017
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Kyung Yul Cheon, Chang Joo Kim, Young Bae Ko, Jae Beom Kim
  • Patent number: 9332440
    Abstract: A method of assigning a frequency channel using efficient spectrum sensing in a multiple Frequency Assignment system includes a channel sensing process, wherein a base station of a secondary user classifies multiple frequency channels licensed to a primary user into a plurality of channel state sets according to usage states, periodically senses channel states by changing a sensing period according to the types of classified channel state sets, and manages the sensed channel states as frequency channel state set information; a channel state set broadcasting process; and a channel assigning process. Accordingly, a frequency channel can be assigned to a secondary user requesting channel assignment using frequency channel state set information without a primary user experiencing interference noise.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: May 3, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Bub Joo Kang, Myung Sun Song, Chang Joo Kim
  • Patent number: 9294327
    Abstract: A method provides an identifying OFDM communication signal using OFDM symbol estimation. In view of the above, the present invention provides an apparatus and method for identifying an OFDM communication signal using an OFDM symbol estimation, which is capable of analyzing the OFDM signal with a high accuracy in a cognitive radio technique, thereby identifying the OFDM signal from a heterogeneous communication signal.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: March 22, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyung Jung Kim, Chang-Joo Kim, Jin Young Kim, Seung-Ho Choi
  • Patent number: 9215661
    Abstract: A method and an apparatus for controlling transmit power of a CR device are provided. The method includes acquiring CR environment information regarding a licensed user or an unlicensed user occupying an adjacent channel or an adjacent cell of the CR device; determining a transmit power value of the CR device using the CR environment information; and generating transmit power control information including the transmit power value. The method and apparatus guarantee reliable communication of the CR device and minimize interference with the licensed user.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: December 15, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Hyun Hwang, Gwangzeen Ko, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um, Min-Sheo Choi
  • Patent number: 9210712
    Abstract: Provided is an apparatus for controlling subcarrier spacing in a system supporting multiple frequency bands. The apparatus for controlling a subcarrier spacing comprises: an interference detection unit detecting interference over multiple frequency bands; a system parameter provision unit providing system parameters related to a subcarrier spacing between the multiple frequency bands—for example RF, FFT size, and channel bandwidth; a subcarrier spacing control unit controlling the subcarrier spacing such that the detected interference is reduced, on the basis of the system parameters. In a system operating with multiple bands, different subcarrier spacing can be applied by each band, thereby controlling interference occurring in each band.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: December 8, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung Hyun Hwang, Jung Sun Um, Hoi Yoon Jung, Gwang Zeen Ko, Byung Jang Jeong, Chang Joo Kim
  • Publication number: 20150223187
    Abstract: The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.
    Type: Application
    Filed: November 13, 2014
    Publication date: August 6, 2015
    Inventors: Kyung Yul CHEON, Chang Joo KIM, Young Bae KO, Jae Beom KIM
  • Publication number: 20150207593
    Abstract: A method and apparatus of an effective and reliable retransmission based on soft combining when using orthogonal frequency division multiplexing (OFDM) modulation technique in a contention based access system. The method includes receiving a data signal from a transmission node, performing soft combining the valid section part of the data signal which have been previously received and the data signal currently received, determining a collision section of the data signal which is currently received, and saving a valid section part except the collision section of the data signal which is currently received in a buffer. In the contention based access system that uses OFDM modulation technique, in case that data signal reception failure occurs due to a transmission collision, the valid part of the received data signal may be detected and effectively applied to the soft combining, and consequently, the reception probability of data signal can be increased.
    Type: Application
    Filed: January 5, 2015
    Publication date: July 23, 2015
    Inventors: Kyung Yul CHEON, Eun Sook JIN, Chang Joo KIM
  • Patent number: 8995409
    Abstract: A communication method of a transmitter using a preamble in a wireless communication system, includes determining at least two subcarriers from among a plurality of subcarriers, for the preamble; mapping a subcarrier sequence and a subcarrier phase value of the preamble to the at least two subcarriers; and transmitting the preamble using the at least two subcarriers. The preamble may include a real component having a first repeated pattern in a preset time interval, and an imaginary component having a second repeated pattern in the preset time interval, and a relationship between the first repeated pattern and the second repeated pattern may indicate characteristic information of the wireless communication system.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: March 31, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Sun Um, Sung Hyun Hwang, Hoi Yoon Jung, Byung Jang Jeong, Chang Joo Kim, Gwang Zeen Ko
  • Publication number: 20150085846
    Abstract: A radio access method for use in a radio access device in cognitive radio ad-hoc networks, the radio access method comprising: comparing additional information about neighboring radio access devices, which exist in the cognitive radio ad-hoc networks, in a second layer of the radio access device with additional information about the neighboring radio access devices in a third layer of the radio access device in the cognitive radio ad-hoc networks; and generating a routing control message when the additional information of the second layer is different from the additional information of the third layer to broadcast the routing control message.
    Type: Application
    Filed: November 6, 2013
    Publication date: March 26, 2015
    Inventors: Cheolhyo LEE, Kyung-yul CHEON, Chang-Joo KIM, Young-Bae XO, Jaebeom KIM
  • Patent number: 8964886
    Abstract: A wireless communication system provides a method and device for transmitting a preamble. A transmitter generates a first preamble sequence used for frequency offset estimation and generates a second preamble sequence according to the transmission mode. The transmitter transmits the first and second preamble sequences. With respect to the second preamble sequence, the phase thereof may be shifted into different phase offsets according to the transmission mode.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: February 24, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Sun Um, Sung Hyun Hwang, Sang Won Kim, Byung Jang Jeong, Chang Joo Kim
  • Patent number: 8964640
    Abstract: Provided is a hybrid beaconing method in which a centralized beaconing scheme and a distributed beaconing scheme are combined. In the hybrid beaconing method, a beaconing scheme is converted according to a network condition, and a centralized beaconing scheme or a distributed beaconing scheme is used to maintain an optimum network status.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: February 24, 2015
    Assignee: Electronics & Telecommunications Research Institute
    Inventors: Gwangzeen Ko, Moon-Won Lee, Sung-Jin You, Sung-Hyun Hwang, Jung-Sun Um, Myung-Sun Song, Chang-Joo Kim
  • Publication number: 20140376493
    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
    Type: Application
    Filed: September 5, 2014
    Publication date: December 25, 2014
    Inventors: Sung-Hyun HWANG, Chang-Joo KIM, Myung-Sun SONG, Jung-Sun UM
  • Publication number: 20140362685
    Abstract: A method for dynamically managing channels in a DSA radio system that supports multiple channels, includes producing a number of rendezvous combinations by pairing operating channels and backup channels in an 1:1 relation based on an available channel list. Further, the method includes when an arbitrary operating channel in a rendezvous combination is not suitable for communications, extracting a backup channel from the rendezvous combination to which the arbitrary operating channel belongs; and switching the extracted backup channel as an operating channel to continue a communication.
    Type: Application
    Filed: July 26, 2013
    Publication date: December 11, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventor: Chang-Joo KIM
  • Patent number: 8886129
    Abstract: The present invention relates to a method for reducing an average time period adopted at the time of evaluating an effect of electromagnetic fields of a mobile communication base station near the mobile communication base station on a human body and measurement is performed for 6 minutes at a predetermined measurement point for acquiring a whole body average by comparing a site measurement result targeting multiple base stations and uncertainty by repetitive measurement and when a 6-minute average value and an average value for a reduced time period which is shorter than 6 minutes are compared with each other, a standard deviation is equal to or lower than a predetermined level, e.g., 0.4 dB, it is sufficient even by the measurement for the reduced time period which is shorter than 6 minutes.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: November 11, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung Chan Kim, Je Hoon Yun, Chang Joo Kim
  • Publication number: 20140314165
    Abstract: A method provides an identifying OFDM communication signal using OFDM symbol estimation. In view of the above, the present invention provides an apparatus and method for identifying an OFDM communication signal using an OFDM symbol estimation, which is capable of analyzing the OFDM signal with a high accuracy in a cognitive radio technique, thereby identifying the OFDM signal from a heterogeneous communication signal.
    Type: Application
    Filed: August 13, 2013
    Publication date: October 23, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyung Jung KIM, Chang-Joo KIM, Jin Young KIM, Seung-Ho CHOI
  • Patent number: 8861551
    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: October 14, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Hyun Hwang, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um
  • Patent number: 8855144
    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: October 7, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Hyun Hwang, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um
  • Patent number: 8787271
    Abstract: Provided is a large range management device (LRMD) of managing a communication between a plurality of small range devices (SRDs) and a plurality of large range devices (LRDs), the SRDs and the LRDs being located in a single cell and having different transmission coverage, the LRMD including an access slot allocation unit to allocate an SRD access slot to a radio resource for a downlink, to enable a first SRD to request an association from a network, a selection unit to select a communication relay device for relaying relay data of the first SRD, a relay slot allocation unit to allocate at least one SRD relay slot to a radio resource for an uplink, to enable the communication relay device to relay the relay data to a second SRD or another LRD, and a receiving unit to receive the relay data based on the at least one SRD relay slot.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: July 22, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Sun Um, Gwangzeen Ko, Sung-Hyun Hwang, Myung Sun Song, Chang-Joo Kim