Patents by Inventor Sung Jin Yoo

Sung Jin Yoo 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: 20160242183
    Abstract: Disclosed are an apparatus and a method for coexistence of heterogeneous services of a user terminal, which can enhance performance of a wireless communication network by simultaneously providing heterogeneous services such as an LTE-U service and a WiFi service to coexist without signal interference in unlicensed bands through effectively performing selection of a frequency band and selection of a transmission spectrum type in respective service modules of the user terminal.
    Type: Application
    Filed: February 17, 2016
    Publication date: August 18, 2016
    Inventors: Kyu Min KANG, Seung Keun PARK, Jae Cheol PARK, Jung Sun UM, Sung Jin YOO, Dong Hun LEE, Hoi Yoon JUNG, Su Na CHOI, Sung Hyun HWANG
  • Publication number: 20160234763
    Abstract: An exemplary embodiment of the present information discloses a base station which transmits a discovery reference signal (DRS) in an unlicensed band, including: a transmission control unit which sets different timings to transmit the DRS for each of a plurality of channels; and a communication unit which transmits the DRS to the outside through the plurality of channels based on the set timing.
    Type: Application
    Filed: February 5, 2016
    Publication date: August 11, 2016
    Inventors: Jung Sun UM, Hoi Yoon JUNG, Seung Keun PARK, Sung Jin YOO
  • Patent number: 9349472
    Abstract: A non-volatile memory device includes a two-dimensional array of non-volatile memory cells where a first portion of memory cells being configured as an one-time-programmable memory area; a bypass read-out circuit configured to sense a signal level on a bit line in response to a memory cell in the one-time-programmable memory area being selected and to generate a first signal indicative of the signal level on the bit line; and a trim data latch circuit having an input terminal configured to receive the first signal. The trim data latch circuit is configured to store a signal related to the first signal as a trim data value and to provide trim data value to circuitry of the non-volatile memory device. The trim data value may be applied to adjust a signal level of the circuitry of the non-volatile memory device.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: May 24, 2016
    Assignee: Integrated Silicon Solution, Inc.
    Inventors: Sung Jin Yoo, HanKook Kang
  • Publication number: 20160135135
    Abstract: Disclosed is a communication method for coexisting with a non-licensed band communication system of a non-licensed band in a licensed band communication system. The method includes: transmitting a signal by a transmitter in order to operate in a non-licensed band, when the signal is a transmission target signal having frames and a wireless local area network (WLAN) preamble signal is inserted to the front of each frame of the transmission target signal; and extracting the WLAN preamble signal from the signal of the transmitter by a receiver to synchronize with the transmitter.
    Type: Application
    Filed: November 10, 2015
    Publication date: May 12, 2016
    Inventors: Sung Jin YOO, Kyu Min KANG, Seung Keun PARK, Jae Cheol PARK, Jung Sun UM
  • Patent number: 9293215
    Abstract: A flash memory device uses a pair of parallely connected NMOS transistors with different voltage ratings to generate the reference current for the sense amplifier used in the read out operations. The reference current thus generated is temperature compensated with zero or near-zero temperature coefficient. In some embodiments, the pair of parallely connected NMOS transistors includes a high voltage NMOS transistor and a low voltage NMOS transistor or NMOS transistors with different gate oxide thicknesses.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: March 22, 2016
    Assignee: Integrated Silicon Solution, Inc.
    Inventors: Sung Jin Yoo, Luis Kang
  • Publication number: 20160019950
    Abstract: A flash memory device employs a low current auto-verification programming scheme using multi-step programming voltage and cell current detection. The low current auto-verification programming scheme performs programming of memory cells by the application of programming voltages in step increments. For each programming pulse, the cell current of the memory cell is sensed to determine when the memory cell is programmed. The programming pulse is terminated when the cell current decreases below a reference current level.
    Type: Application
    Filed: July 15, 2015
    Publication date: January 21, 2016
    Inventors: Sung Jin Yoo, Guowei Wang
  • Patent number: 9236922
    Abstract: A communication method of a base station and a terminal based on interference alignment in a multi-cell multi-user multiple-input multiple-output (MIMO) interference channel and a method and apparatus of communication using interference alignment and block successive interference pre-cancellation in a multi-user MIMO interference channel. The base station may determine a precoding matrix to maximize a signal to interference and noise ratio (SINR) and a signal to leakage and noise ratio (SLNR) in the interference channel, and a terminal communicating with the base station may determine a decoding matrix to align interference. The transmitter including a multicell interference channel may calculate a rotation matrix for interference alignment, identify effective symbol vectors using the rotation matrix, and generate a transmit signal of a target transmitter to pre-cancel interference corresponding to a transmit signal of a neighboring transmitter.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: January 12, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jae Hyun Park, Sung Jin Yoo, Myung Sun Song, Byung Jang Jeong, Jae Ick Choi
  • Publication number: 20150382234
    Abstract: A wireless communication method may include performing, by a first system, channel monitoring of a first band, detecting a second system that uses the first band, determining whether the first system is to be used in preference to the second system, and allocating a radio resource of the first band to the first system based on whether the first system is to be used in preference to the second system.
    Type: Application
    Filed: June 25, 2015
    Publication date: December 31, 2015
    Inventors: Sung Jin YOO, Jung Sun UM, Byung Jang JEONG, Sung Hyun HWANG
  • Publication number: 20150279473
    Abstract: A non-volatile memory device includes a two-dimensional array of non-volatile memory cells where a first portion of memory cells being configured as an one-time-programmable memory area; a bypass read-out circuit configured to sense a signal level on a bit line in response to a memory cell in the one-time-programmable memory area being selected and to generate a first signal indicative of the signal level on the bit line; and a trim data latch circuit having an input terminal configured to receive the first signal. The trim data latch circuit is configured to store a signal related to the first signal as a trim data value and to provide trim data value to circuitry of the non-volatile memory device. The trim data value may be applied to adjust a signal level of the circuitry of the non-volatile memory device.
    Type: Application
    Filed: March 25, 2014
    Publication date: October 1, 2015
    Applicant: Integrated Silicon Solution, Inc.
    Inventors: Sung Jin Yoo, HanKook Kang
  • Publication number: 20150270006
    Abstract: A flash memory device uses a pair of parallely connected NMOS transistors with different voltage ratings to generate the reference current for the sense amplifier used in the read out operations. The reference current thus generated is temperature compensated with zero or near-zero temperature coefficient. In some embodiments, the pair of parallely connected NMOS transistors includes a high voltage NMOS transistor and a low voltage NMOS transistor or NMOS transistors with different gate oxide thicknesses.
    Type: Application
    Filed: March 18, 2014
    Publication date: September 24, 2015
    Applicant: Integrated Silicon Solution, Inc.
    Inventors: Sung Jin Yoo, Luis Kang
  • Patent number: 9137053
    Abstract: Disclosed herein are an apparatus and a method of estimating a channel in consideration of a residual synchronization offset. The apparatus of estimating a channel in consideration of a residual synchronization offset includes: a channel estimating unit estimating the channel using pilots scattered over a plurality of OFDM symbols and calculating a first channel estimated value as the estimation result, in the case in which an OFDM symbol estimating the channel and an OFDM symbol compensating for the channel are different from each other; and a phase reflecting unit calculating a phase generated by the residual synchronization offset in proportion to a difference between a channel estimation time and a channel compensation time, reflecting the calculated phase in the first channel estimated value, and calculating a second channel estimated value as the reflection result.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: September 15, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Hyun Hwang, Jung-Sun Um, Sung-Jin Yoo, Byung-Jang Jeong, Myung-Sun Song
  • Publication number: 20150245170
    Abstract: Disclosed are an apparatus and a method for securing an available frequency that secure a frequency in a communication area set so as not to overlap with a service protection area of a primary user as an available frequency to prevent interference with the primary user even in the case of communicating with a frequency sharing wireless apparatus without a positioning function. To this end, the apparatus for securing an available frequency includes: a storage unit storing positional information regarding a primary user protection area and information on a frequency for each communication area; a positioning unit measuring a current position; and a control unit calculating a spacing distance from the primary user protection area based on the current position measured by the positioning unit and securing a frequency which does not exceed the calculated spacing distance as an available frequency.
    Type: Application
    Filed: January 21, 2015
    Publication date: August 27, 2015
    Inventors: Sang In CHO, Sung Jin YOO, Byung Jang JEONG
  • Patent number: 9117549
    Abstract: A flash memory device employs a low current auto-verification programming scheme using multi-step programming voltage and cell current detection. The low current auto-verification programming scheme performs programming of memory cells by the application of programming voltages in step increments. For each programming pulse, the cell current of the memory cell is sensed to determine when the memory cell is programmed. The programming pulse is terminated when the cell current decreases below a reference current level.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: August 25, 2015
    Assignee: Integrated Silicon Solution, Inc.
    Inventors: Sung Jin Yoo, Guowei Wang
  • Publication number: 20150223238
    Abstract: Disclosed is a method for managing network resources of a wireless terminal in a heterogeneous network environment and the method for managing network resources includes: searching for one or more networks which are accessible in the heterogeneous network environment; acquiring cycle information of the networks searched through the network searching; determining coexistence management cycles of the searched networks based on the cycle information; allocating one or more networks to be used in data transmission among the networks searched according to the coexistence management cycle and determining transmission management cycles of one or more allocated networks; and managing a resource of the searched network according to the coexistence management cycle and the transmission management cycle.
    Type: Application
    Filed: January 19, 2015
    Publication date: August 6, 2015
    Inventors: Jin Suk PAK, Byung Jang JEONG, Sung Jin YOO, Jae Ick CHOI
  • Publication number: 20150208441
    Abstract: Provided is a hidden node detection method and apparatus in a wireless communication system, the apparatus including a sensing unit to sense a first communication device transmitting a data signal from among a plurality of communication devices sharing a wireless channel, a transmitter to generate a reception notification signal in response to the sensing, and transmit the reception notification signal to the a plurality of communication devices through a band identical to a transmission band of the data signal, and a controller to prevent a collision with the data signal transmitted from the first communication device through the wireless channel by delaying processing of a data transmission request when the data transmission request is input from a second communication device among the plurality of communication devices while maintaining the transmitting of the reception notification signal.
    Type: Application
    Filed: August 15, 2014
    Publication date: July 23, 2015
    Inventors: Sung Jin YOO, Jin Suk PAK, Byung Jang JEONG, Sung Hyun HWANG
  • Publication number: 20150201431
    Abstract: Provided are a data frame structure of a wireless communication system, which follows a sharing protocol which may be operated to coexist with a system that operates in an unlicensed spectrum, such as a WiFi system, and the like in the wireless communication system using a licensed spectrum such as an LTE system and an operation method of the system, and a terminal and a device of a base station for the operation.
    Type: Application
    Filed: January 15, 2015
    Publication date: July 16, 2015
    Inventors: Jung Sun UM, Hoi Yoon JUNG, Byung Jang JEONG, Sung Jin YOO, Jae Ick CHOI
  • Publication number: 20150188746
    Abstract: Disclosed herein are a method and a system for performing initial ranging in a cognitive radio network The method for performing initial ranging in a cognitive radio network includes: detecting signals received in one or more ranging sections; estimating a tint time offset based on a correlation between subcarrier indices of the signals detected in the one or more ranging sections; estimating a second time offset based on correlations for the signals detected in the one or more ranging sections and a plurality of codes that are predetermined and detecting an initial ranging code among the plurality of codes; and estimating a time offset of a CPE performing initial ranging with the detected initial ranging code using the first time offset and the second time offset that are estimated.
    Type: Application
    Filed: August 4, 2014
    Publication date: July 2, 2015
    Inventors: Jung-Sun UM, Sung-Hyun HWANG, Sung-Jin YOO,, Byung-Jang JEONG,, Jae-Ick CHOI
  • Publication number: 20150117393
    Abstract: Provided herein is a method and apparatus for heterogeneous carrier aggregation, the method including calculating interferences regarding a plurality of interference paths between an adjacent cell and serving cell; determining weighted values for the plurality of interference paths in the serving cell; calculating an accumulated value (accumulated margin or accumulated interference) regarding the plurality of interference paths based on the weighted values in the serving cell; determining a component carrier to be used in the carrier aggregation based on the accumulated value calculated in the serving cell; and performing the carrier aggregation based on the component carrier determined.
    Type: Application
    Filed: October 27, 2014
    Publication date: April 30, 2015
    Inventors: Sung Hyun HWANG, Sung Jin YOO, Jung Sun UM, Byung Jang JEONG, Jae Ick CHOI
  • Publication number: 20150111595
    Abstract: Provided are a method of scheduling spectrum sensing and a method of allocation uplink radio resource in a cognitive radio communication system. The method of scheduling spectrum sensing in a cognitive radio communication system includes classifying terminals in a cell into terminals affecting spectrum sensing and terminals not affecting spectrum sensing, and performing spectrum sensing when it is determined that uplink signals of other terminals do not affect spectrum sensing based on results of the classification.
    Type: Application
    Filed: June 13, 2014
    Publication date: April 23, 2015
    Inventors: Sung-Jin YOO, Sung-Hyun HWANG, Jung-Sun UM, Byung-Jang JEONG
  • Publication number: 20150092871
    Abstract: Disclosed herein are an apparatus and a method of estimating a channel in consideration of a residual synchronization offset. The apparatus of estimating a channel in consideration of a residual synchronization offset includes: a channel estimating unit estimating the channel using pilots scattered over a plurality of OFDM symbols and calculating a first channel estimated value as the estimation result, in the case in which an OFDM symbol estimating the channel and an OFDM symbol compensating for the channel are different from each other; and a phase reflecting unit calculating a phase generated by the residual synchronization offset in proportion to a difference between a channel estimation time and a channel compensation time, reflecting the calculated phase in the first channel estimated value, and calculating a second channel estimated value as the reflection result.
    Type: Application
    Filed: June 23, 2014
    Publication date: April 2, 2015
    Inventors: Sung-Hyun HWANG, Jung-Sun UM, Sung-Jin YOO, Byung-Jang JEONG, Myung-Sun SONG