Patents by Inventor Seung-il Myong

Seung-il Myong 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: 20190037348
    Abstract: A method of measuring inter-device relative coordinates performed by a first device communicating with at least one second device belonging to a group to which the first device belongs includes measuring a range between the first device and the second device through communication with the second device; receiving range information between a plurality of second devices from the second device; calculating a plurality of solutions for inter-device relative coordinates using information about the range between the first device and the second device and the range information between the plurality of second devices; and deducing a true solution among the plurality of solutions for the inter-device relative coordinates using coordinates of each of the first device and the at least one second device with respect to a reference origin that is calculated using a Pedestrian Dead Reckoning (PDR) technique.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 31, 2019
    Inventors: Hoe Sung YANG, Seung Il MYONG, Kang Bok LEE, Jun Ho JIN
  • Publication number: 20180130444
    Abstract: An information image display apparatus includes an illuminance sensor sensing illuminance of incident light; a processor for determining a transmittance of a polarizer according to the illuminance sensed by the illuminance sensor, outputting a control signal according to the sensed illuminance, analyzing an entire or partial area of a foreground image of external environment to determine a dominant color of the entire or partial area, and displaying an information image using a color contrasted with dominant color; and a polarizer for selectively transmitting the incident light by adjusting a degree of polarization according to the control signal input from the processor.
    Type: Application
    Filed: November 7, 2017
    Publication date: May 10, 2018
    Inventors: Seung Il MYONG, Dong Beom SHIN, Kang Bok LEE, Myung Nam BAE
  • Publication number: 20160308605
    Abstract: An apparatus and method for driving an optical source for an optical fiber link monitoring apparatus. The apparatus for driving an optical source for an optical fiber link monitoring apparatus includes a laser part configured to output probe light that corresponds to a bipolar code probe signal; an optical receiver configured to convert reflected light, which has travelled back from an optical fiber link after transmission of the bipolar probe light, into an electrical signal; and a direct-current (DC) canceller configured to remove a DC offset component from the electrical signal generated by the optical receiver.
    Type: Application
    Filed: April 14, 2016
    Publication date: October 20, 2016
    Inventors: Hun Sik KANG, Jong Hyun LEE, Jyung Chan LEE, Seung IL MYONG
  • Publication number: 20160238483
    Abstract: Disclosed is an optical fiber cable monitoring apparatus using a dual light source. The optical fiber cable monitoring apparatus includes: an optical transmitter configured to comprise a first light source and a second light source, which output light of different wavelengths, and to operate the first light source and the second light source to propagate first probe light and second probe light to an optical fiber cable; and an optical receiver configured to comprise a first light receiving module and a second light receiving module, each receiving first reflected light and second reflected light which are reflected from the optical fiber cable.
    Type: Application
    Filed: February 12, 2016
    Publication date: August 18, 2016
    Inventors: Seung IL MYONG, Jyung Chan LEE, Hun Sik KANG, Jong Hyun LEE
  • Publication number: 20160233956
    Abstract: An optical fiber link monitoring apparatus for detecting a failure in an optical fiber link by analyzing a trace of a received signal that has been transmitted to and reflected from said optical fiber link. The optical fiber link monitoring apparatus includes a variable gain amplifier (VGA), an analog/digital converter (ADC), and a controller. The VGA amplifies a gain of the received signal, for which the ADC converts the gain-amplified signal into a digital signal. The controller then analyzes a digital signal trace and adjusts the gain of the VGA according to the analysis result.
    Type: Application
    Filed: February 4, 2016
    Publication date: August 11, 2016
    Inventors: Hun Sik KANG, Jong Hyun LEE, Jyung Chan LEE, Seung Il MYONG
  • Patent number: 9246628
    Abstract: Provided is a hybrid passive optical network (PON) system. The hybrid PON system of wavelength division multiplexing (WDM)/time division multiplexing (TDM) may include an optical line terminal (OLT) and an optical network unit (ONU). The OLT and the ONU may transmit a signal based on wavelength reuse using a seed light source and a reflective modulator. The light source may include a seed light source having a single wavelength, two seed light sources having different wavelength bands, and a light source having a wavelength tunable characteristic.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: January 26, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung-Hyun Cho, Jie Hyun Lee, Seung Il Myong, Sang Soo Lee, Jong Hyun Lee, Eui Suk Jung, Kwang Ok Kim
  • Patent number: 9225570
    Abstract: There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: December 29, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kyeong-Hwan Doo, Hak-Jeon Bang, Seung-Il Myong, Seung-Hyun Cho, Jie-Hyun Lee
  • Patent number: 9219567
    Abstract: A converged passive optical network (CPON) and a data transmission method are disclosed. The CPON is a combination of a time division multiple access-passive optical network (TDMA-PON) and an orthogonal frequency division multiple access-passive optical network (OFDMA-PON) and is able to dynamically controlling a bandwidth for upstream signal transmission through allocation of multiple subcarriers to each single optical network unit (ONU).
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: December 22, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kwang Ok Kim, Seung-Hyun Cho, Jie Hyun Lee, Seung Il Myong, Sang Soo Lee, Jong Hyun Lee
  • Patent number: 9197351
    Abstract: Provided is a method of selecting a wavelength of an optical network unit including selecting a pre-loaded default wavelength as an available wavelength candidate or the wavelength that has been changed when a preset wavelength changing condition is satisfied as the available wavelength candidate, acquiring frame synchronization for a downstream signal having the same wavelength as the selected available wavelength candidate, and transmitting a registration request message to an optical line terminal (OLT) from which the downstream signal has been transmitted when the frame synchronization is acquired, assigning the available wavelength candidate to an available wavelength used for communication with the OLT and registering the terminal in the OLT when a registration allowance message is received from the OLT.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: November 24, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kyeong-Hwan Doo, Seung-Il Myong, Han-Hyub Lee, Seung-Hyun Cho, Jie-Hyun Lee, Sang-Soo Lee
  • Patent number: 9191116
    Abstract: An orthogonal frequency division multiple access-passive optical network including a plurality of optical network units each configured to generate orthogonal frequency division multiplexed signals, which are allocated thereto, based on a central frequency for frequency division multiplexing that is allocated in advance, and to use the generated signals in upstream transmission.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: November 17, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seung-Hyun Cho, Seung-Il Myong, Kyeong-Hwan Doo, Jie-Hyun Lee, Sang-Soo Lee, Jong-Hyun Lee
  • Publication number: 20150323419
    Abstract: Provided is an apparatus and a method for partial monitoring of an optical fiber, wherein the optical fiber monitoring apparatus includes a monitoring light transmitter to continuously output a monitoring light to the optical fiber based on a number of measuring time sections generated by dividing an optical fiber monitoring time section, a monitoring light receiver to receive a monitoring light fed back from the optical fiber, measure a monitoring light received based on different measuring time sections for each monitoring light, and store a result of the measuring in a storage medium, and an optical fiber monitor to monitor a status of the optical fiber based on the result of the measuring stored in the storage medium.
    Type: Application
    Filed: April 9, 2015
    Publication date: November 12, 2015
    Inventors: Seung Il MYONG, Jyung Chan LEE, Hun Sik KANG, Won Kyoung LEE, Jin Hee HAN
  • Patent number: 9137850
    Abstract: A wired/wireless converged media access control (MAC) adaptor and a method for transmitting a frame using the same. The wired/wireless converged MAC adaptor may include a service network interface (SNI) to transmit a MAC frame corresponding to a wired or wireless service, or common public radio interface (CPRI) data, a frame conversion unit to convert, into an orthogonal frequency division multiplexing (OFDM) frame, a wired/wireless converged MAC frame having a common frame structure of the MAC frame corresponding to the wired or wireless service or the CPRI data, and an OFDM interface configured to transmit the OFDM frame to an optical OFDM modem by dynamically allocating sub-carriers based on data transmission characteristics.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: September 15, 2015
    Assignee: Electronics and Telecomunications Research Institute
    Inventors: Kwang Ok Kim, Seung Il Myong, Sang Soo Lee, Jong Hyun Lee
  • Patent number: 9136941
    Abstract: An optical layer monitoring apparatus and method thereof are provided. According to an embodiment of the present invention, an optical layer monitoring apparatus including an optical time domain reflectometer (OTDR) function so as to monitor an optical path of a passive optical network (PON), and a method for improving accuracy of measured monitoring results using the optical layer monitoring apparatus are provided. Therefore, it is possible to enable a user to continuously detect distortion or attenuation along the optical path, and to quickly recover from the distortion or attenuation along the optical path when distortion or attenuation is detected.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 15, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Han-Hyub Lee, Seung-Il Myong, Eui-Suk Jung, Sang-Soo Lee
  • Patent number: 9130675
    Abstract: A modulation method of an optical modem and a signal transmission apparatus performing the method are disclosed. The modulation method of the optical modem includes an optical interface providing a signal to a light source, a photo detector receiving reflected light by an optical link when output light from the light source based on the provided signal is reflected by the optical link, the photo detector measuring and determining characteristics of the optical link using the reflected light, and the optical modem determining a power level and a modulation method for each subcarrier based on the characteristics of the optical link.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: September 8, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Hyun Cho, Jie Hyun Lee, Kwang Ok Kim, Eui Suk Jung, Seung Il Myong, Sang Soo Lee, Jong Hyun Lee
  • Patent number: 9091824
    Abstract: Provided are a user-selectable laser and an optical transmitter including the same. The user-selectable laser is an external cavity laser including a semiconductor laser diode for outputting an optical signal, and a wavelength selection filter. The user-selectable laser may allow a user to select a wavelength selection filter which is optically coupled with the semiconductor laser diode and selectively causes oscillation at the wavelength of an optical signal output from the semiconductor laser diode.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: July 28, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jie-Hyun Lee, Seung-Hyun Cho, Seung-Il Myong, Kwang-Ok Kim, Eui-Suk Jung, Sang-Soo Lee
  • Publication number: 20150098479
    Abstract: An optical pulse output apparatus and method for controlling a width and an intensity of an optical pulse are provided. The optical pulse output apparatus may include a laser driver to control an optical pulse output by a laser, based on a plurality of channel signals, and a channel delay unit to delay at least one of the plurality of channel signals.
    Type: Application
    Filed: June 13, 2014
    Publication date: April 9, 2015
    Inventors: Jyung Chan LEE, Seung Il MYONG
  • Publication number: 20150071649
    Abstract: A detachable optical transceiver includes an optical part configured to convert an electric signal into an optical signal and transmit the optical signal, or to convert an optical signal into an electric signal and output the electric signal; and an electronic circuit part configured to amplify an electric signal input from a host board and output the amplified electric signal to the optical part, and to amplify an electric signal output from the optical part and output the amplified electric signal to the host board, wherein the optical part and the electronic circuit part are formed to have housings and the optical part and the electronic circuit part are connected and disconnected via connectors formed on the respective housings.
    Type: Application
    Filed: September 9, 2014
    Publication date: March 12, 2015
    Inventors: JIE HYUN LEE, SEUNG HYUN CHO, KYEONG HWAN DOO, SEUNG IL MYONG
  • Publication number: 20140219659
    Abstract: There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.
    Type: Application
    Filed: November 18, 2013
    Publication date: August 7, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Kyeong-Hwan DOO, Hak-Jeon BANG, Seung-Il MYONG, Seung-Hyun CHO, Jie-Hyun LEE
  • Publication number: 20140219661
    Abstract: Provided is a method of selecting a wavelength of an optical network unit including selecting a pre-loaded default wavelength as an available wavelength candidate or the wavelength that has been changed when a preset wavelength changing condition is satisfied as the available wavelength candidate, acquiring frame synchronization for a downstream signal having the same wavelength as the selected available wavelength candidate, and transmitting a registration request message to an optical line terminal (OLT) from which the downstream signal has been transmitted when the frame synchronization is acquired, assigning the available wavelength candidate to an available wavelength used for communication with the OLT and registering the terminal in the OLT when a registration allowance message is received from the OLT.
    Type: Application
    Filed: November 18, 2013
    Publication date: August 7, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Kyeong-Hwan DOO, Seung-Il MYONG, Han-Hyub LEE, Seung-Hyun CHO, Jie-Hyun LEE, Sang-Soo LEE
  • Patent number: 8791857
    Abstract: To track the location of a terminal in an indoor space by using a pseudo GPS signal transmitter, a GPS signal sent from an artificial satellite is received, and a clock signal of the artificial satellite is extracted from the received GPS signal to perform synchronization with the artificial satellite. Once synchronization with the artificial satellite is performed, a pseudo GPS signal is generated, and the transmission time of the pseudo GPS signal is controlled. The GPS signal is sent to the terminal located in the indoor space by a plurality of transmitting antennas based on the controlled transmission time, thereby enabling the terminal located in the indoor space to track its location.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: July 29, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sang Hyun Mo, Heyung Sub Lee, Jae Heum Lee, Seung-Il Myong, Hoe-Sung Yang, Kang Bok Lee, Cheol Sig Pyo