Patents by Inventor June-koo Rhee

June-koo Rhee 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).

  • Patent number: 10824373
    Abstract: The present invention relates to the architecture of a quantum RAM, a method for using classical data in quantum computing by inputting the classical data as quantum data, and a system and method of operating a quantum database using the architecture. Quantum computing can achieve an exponential speed-up in some applications using a large parallel process provided by a quantum database in which information can be superposed. The present invention proposes an efficient quantum database architecture and protocol that can record and search for classical information with a quantum circuit.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: November 3, 2020
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: June-Koo Rhee, Kyungdeock Park
  • Publication number: 20200304300
    Abstract: The present invention, which is used for continuous variable quantum key distribution (CVQKD) with asynchronous local oscillators, relates to a system for performing a phase compensation of a scheme of using LO phase estimation and feedback at a receiver (Bob) using a pilot signal from a transmitter (Alice) and a scheme of measuring quantum state data using an LO having a predetermined phase at the receiver (Bob) and estimating and feeding back an LO phase through multi-dimensional reconciliation (MDR).
    Type: Application
    Filed: April 13, 2018
    Publication date: September 24, 2020
    Inventors: June Koo Rhee, Il Hwan Park, Kyong Chun Lim, Jun Sang Oh, Yong Seen Kim
  • Publication number: 20200195428
    Abstract: The present invention relates to a method and an apparatus for quantum key distribution according to a continuous-variable quantum key distribution protocol, which distributes the quantum key in a reverse post-processing manner and, after photon sub traction at a receiver (Bob), detects bit information from a received quantum state to calculate and share the quantum key, such that security can be further enhanced and a cryptographic key generation rate can be increased since the cryptographic key is not exposed to an attacker (Eve).
    Type: Application
    Filed: January 4, 2018
    Publication date: June 18, 2020
    Inventors: June Koo Rhee, Kyong Chun Lim, Chang Ho Suh
  • Publication number: 20190354316
    Abstract: The present invention relates to the architecture of a quantum RAM, a method for using classical data in quantum computing by inputting the classical data as quantum data, and a system and method of operating a quantum database using the architecture. Quantum computing can achieve an exponential speed-up in some applications using a large parallel process provided by a quantum database in which information can be superposed. The present invention proposes an efficient quantum database architecture and protocol that can record and search for classical information with a quantum circuit.
    Type: Application
    Filed: May 15, 2019
    Publication date: November 21, 2019
    Inventors: June-Koo Rhee, Kyungdeock Park
  • Patent number: 10039068
    Abstract: A method of synchronization in a distributed wireless communication system and a terminal supporting the same are disclosed. A terminal increases its contention window value if it receives a synchronization signal within a synchronization slot. The terminal decreases its contention window value if it receives no synchronization signal within the synchronization slot. The terminal determines whether to transmit a synchronization signal or not by using the increased or decreased contention window value.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: July 31, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung-Jae Kwak, Kapseok Chang, June-Koo Rhee, Junhyuk Kim
  • Patent number: 9954754
    Abstract: Provided are a random access method and a terminal supporting the random access method. The terminal may monitor a state of a channel, when the state of the channel is idle, attempt a packet transmission at a first packet transmission probability, and transmit a packet including the first packet transmission probability.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: April 24, 2018
    Assignees: Electronics and Telecommunications Research Institute, KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Byung-Jae Kwak, June-Koo Rhee, Junhyuk Kim, Kyounghye Kim
  • Patent number: 9860864
    Abstract: Disclosed herein are a method of performing synchronization in a distributed wireless communication system, and a terminal supporting the same. A distributed wireless communication system includes a plurality of networks. Time resources of each of a plurality of networks are divided into a synchronization slot, a discovery slot, a peering slot, and a data slot. A first terminal belonging to a first network determines whether a synchronization signal is received from a terminal belonging to a second network in the data slot of the first network. The first terminal detects whether it has met the second network that is out of synchronization with the first network if the synchronization signal is determined to have been received.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: January 2, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung-Jae Kwak, Kapseok Chang, June-Koo Rhee, Junhyuk Kim
  • Patent number: 9699747
    Abstract: Disclosed is a synchronization method in a distributed wireless communication system and a terminal supporting the same. In a synchronization method, a terminal splits a synchronization period into a plurality of backoff slots and randomly selects a backoff counter using the contention window. Furthermore, the terminal checks whether a channel is idle during at least one of the plurality of backoff slots and changes the backoff counter based on a result of the check.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: July 4, 2017
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung-Jae Kwak, Kapseok Chang, June-Koo Rhee, Junhyuk Kim, Kyounghye Kim
  • Publication number: 20160128103
    Abstract: Provided are a random access method and a terminal supporting the random access method. The terminal may monitor a state of a channel, when the state of the channel is idle, attempt a packet transmission at a first packet transmission probability, and transmit a packet including the first packet transmission probability.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 5, 2016
    Inventors: Byung-Jae KWAK, June-Koo RHEE, Junhyuk KIM, Kyounghye KIM
  • Publication number: 20160081047
    Abstract: Disclosed is a synchronization method in a distributed wireless communication system and a terminal supporting the same. In a synchronization method, a terminal splits a synchronization period into a plurality of backoff slots and randomly selects a backoff counter using the contention window. Furthermore, the terminal checks whether a channel is idle during at least one of the plurality of backoff slots and changes the backoff counter based on a result of the check.
    Type: Application
    Filed: September 11, 2015
    Publication date: March 17, 2016
    Inventors: Byung-Jae KWAK, Kapseok CHANG, June-Koo RHEE, Junhyuk KIM, Kyounghye KIM
  • Patent number: 9246697
    Abstract: A communication device, a multicast control method, and a scheduling control method are disclosed. The communication device includes: a decoding buffer that stores a first multicast packet received from a first node and a second multicast packet received from a second node; an encoder that performs network coding of the first and second multicast packets; and a transmitter that transmits the network-coded packets output from the encoder to the first node and the second node.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: January 26, 2016
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: June Koo Rhee, Dujeong Lee, Kyounghye Kim, Junhyuk Kim
  • Publication number: 20150341875
    Abstract: A method of synchronization in a distributed wireless communication system and a terminal supporting the same are disclosed. A terminal increases its contention window value if it receives a synchronization signal within a synchronization slot. The terminal decreases its contention window value if it receives no synchronization signal within the synchronization slot. The terminal determines whether to transmit a synchronization signal or not by using the increased or decreased contention window value.
    Type: Application
    Filed: May 1, 2015
    Publication date: November 26, 2015
    Inventors: Byung-Jae KWAK, Kapseok CHANG, June-Koo RHEE, Junhyuk KIM
  • Patent number: 9160563
    Abstract: Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: October 13, 2015
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Jeong-Dong Ryoo, June-Koo Rhee, Bheom-Soon Joo, Jin-Sung Im, Zahir Uddin Ahmad, Yang Yang, Marc Holness
  • Publication number: 20150264658
    Abstract: Disclosed herein are a method of performing synchronization in a distributed wireless communication system, and a terminal supporting the same. A distributed wireless communication system includes a plurality of networks. Time resources of each of a plurality of networks are divided into a synchronization slot, a discovery slot, a peering slot, and a data slot. A first terminal belonging to a first network determines whether a synchronization signal is received from a terminal belonging to a second network in the data slot of the first network. The first terminal detects whether it has met the second network that is out of synchronization with the first network if the synchronization signal is determined to have been received.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 17, 2015
    Inventors: Byung-Jae KWAK, Kapseok CHANG, June-Koo RHEE, Junhyuk KIM
  • Patent number: 9002209
    Abstract: Disclosed are a forward discrete/inverse-discrete Fourier transform device and method for optical orthogonal frequency division multiplexing (OFDM) communication and a transmitting and receiving apparatus. The forward inverse-discrete Fourier transform device includes N 1:N splitters for splitting subcarrier signals received from N inputs corresponding to the number of optical frequencies of subcarriers, a phase shift delay array module for shifting phases of the split signals from the 1:N splitters, N N:1 power couplers for coupling signals output from the phase shift delay array module, a time delay array module for performing time delay on optical OFDM symbols from the N:1 power couplers, and an N:1 power coupler for coupling signals output from the time delay array module.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: April 7, 2015
    Assignee: ICU Research and Industrial Cooperation Group
    Inventors: June Koo Rhee, Kyu Sang Lee, Chan T. D. Thai
  • Patent number: 8964681
    Abstract: A method and apparatus for user scheduling in a multi-user multiple input multiple output (MIMO) communication system are provided. The method includes identifying a user group comprising user terminals. The method further includes comparing power consumptions based on the user group. The method further includes scheduling the user terminals based on the comparing.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: February 24, 2015
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Byung Moo Lee, Byung Chang Kang, Jun Hyuk Kim, Jong Ho Bang, June Koo Rhee, Jin Hyeock Choi
  • Publication number: 20140241148
    Abstract: Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed.
    Type: Application
    Filed: May 7, 2014
    Publication date: August 28, 2014
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (ETRI)
    Inventors: Jeong-Dong RYOO, June-Koo RHEE, Bheom-Soon JOO, Jin-Sung IM, Zahir Uddin AHMAD, Yang YANG, Marc HOLNESS
  • Patent number: 8797845
    Abstract: Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: August 5, 2014
    Assignees: Electronics and Telecommunications Research Institute, Korea Advance Institute of Science and Tecnology
    Inventors: Jeong-Dong Ryoo, June-Koo Rhee, Bheom-Soon Joo, Jin-Sung Im, Zahir Uddin Ahmad, Yang Yang, Marc Holness
  • Publication number: 20140211796
    Abstract: A communication device, a multicast control method, and a scheduling control method are disclosed. The communication device includes: a decoding buffer that stores a first multicast packet received from a first node and a second multicast packet received from a second node; an encoder that performs network coding of the first and second multicast packets; and a transmitter that transmits the network-coded packets output from the encoder to the first node and the second node.
    Type: Application
    Filed: January 24, 2014
    Publication date: July 31, 2014
    Applicant: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: June Koo RHEE, Dujeong LEE, Kyounghye KIM, Junhyuk KIM
  • Patent number: 8792514
    Abstract: A packet switching system includes a plurality of switch fabrics connected in cascade and a plurality of buffers respectively connected to the plurality of switch fabrics. In the event of packet competition, the plurality of switch fabrics buffer the competing packets to the corresponding buffers through buffer connection ports, and forward the competing packets in excess of the number of buffer connection ports to an adjacent switch fabric through switch connection ports.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: July 29, 2014
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: June Koo Rhee, Chan-Kyun Lee