Patents by Inventor Duk-Hyun Park

Duk-Hyun Park 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: 8368107
    Abstract: A light emitting device according to the embodiment includes a conductive support member having a step portion at an outer peripheral region thereof, a protective member for filling the step portion formed at the outer peripheral region of the conductive support member, a reflective layer over the conductive support member, and a light emitting structure over the reflective layer and the protective member.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: February 5, 2013
    Assignee: LG Innotek Co., Ltd.
    Inventors: Jung Hyeok Bae, Young Kyu Jeong, Kyung Wook Park, Duk Hyun Park
  • Publication number: 20120316662
    Abstract: The present invention relates to a system and method for providing contents through a network in a device incapable of connecting to a network, the system including a contents playback device provided with an audio output port, for playing back the contents; and a dongle device supporting CPNS and attached to the audio output port to enable the contents playback device to operate as a device capable of connecting to a network, for capturing and encoding contents outputted from the contents playback device and providing an external user terminal with the encoded contents through the network. Accordingly, according to the present invention, the contents playback device incapable of connecting to a network is enabled to operate as a device capable of connecting to a network only by attaching the dongle device, and since the dongle device encodes the contents (e.g.
    Type: Application
    Filed: March 24, 2011
    Publication date: December 13, 2012
    Applicant: SK Planet Co., Ltd.
    Inventors: Hun Huh, Duk Hyun Park, Hyoung Gyun Kim, Eun Bok Lee
  • Publication number: 20110198660
    Abstract: Provided is a light emitting device. In one embodiment, a light emitting device including: a support member; a light emitting structure on the support member, the light emitting structure comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer; a protective member at a peripheral region of an upper surface of the support member; an electrode including an upper portion being on the first conductive type semiconductor layer, a side portion extended from the upper portion and being on a side surface of the light emitting structure, and an extended portion extended from the side portion and being on the protective member; and an insulation layer between the side surface of the light emitting structure and the electrode.
    Type: Application
    Filed: February 18, 2011
    Publication date: August 18, 2011
    Inventors: Jung Hyeok Bae, Young Kyu Jeong, Kyung Wook Park, Duk Hyun Park
  • Publication number: 20110175124
    Abstract: A light emitting device according to the embodiment includes a conductive support member having a step portion at an outer peripheral region thereof, a protective member for filling the step portion formed at the outer peripheral region of the conductive support member, a reflective layer over the conductive support member, and a light emitting structure over the reflective layer and the protective member.
    Type: Application
    Filed: December 17, 2010
    Publication date: July 21, 2011
    Inventors: Jung Hyeok BAE, Young Kyu Jeong, Kyung Wook Park, Duk Hyun Park
  • Publication number: 20110175125
    Abstract: Provided is a light emitting device. The light emitting device comprises: In one embodiment, a light emitting device includes: a light emitting structure comprising a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer; and a conductive support member under the light emitting structure. The conductive support member comprises a first conductive support member and a second conductive support member. The second conductive support member has a thermal conductivity higher than that of the first conductive support member.
    Type: Application
    Filed: January 14, 2011
    Publication date: July 21, 2011
    Inventors: Jung Hyeok BAE, Young Kyu JEONG, Kyung Wook PARK, Duk Hyun PARK
  • Publication number: 20100230702
    Abstract: Disclosed is a light emitting device including a conductive substrate; a reflective layer on the conductive substrate; an etching protective layer on a peripheral portion of a top surface of the conductive substrate; and a light emitting structure, which is formed on the reflective layer and the etching protective layer such that the etching protective layer is partially exposed and includes a first conductive semiconductor layer, a second conductive semiconductor layer and an active layer between the first and second conductive semiconductor layers, wherein the etching protective layer includes a first refractive layer having a first refractive index and a second refractive layer having a second refractive index greater than the first refractive index.
    Type: Application
    Filed: March 9, 2010
    Publication date: September 16, 2010
    Inventor: Duk Hyun Park
  • Publication number: 20100151601
    Abstract: In an apparatus for curing a seal in an electrophoretic display device according to the present invention, a support having magnetism may be provided on a curing table to be loaded with an electrophoretic display device in order to support the electrophoretic display device while at the same time generating a magnetic force in a direction opposite to a stress caused by a seal material in the electrophoretic display device, thereby preventing the electrophoretic display device from being bent when the seal material is cured.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Inventors: Duk-Hyun PARK, Jae-Soo PARK
  • Patent number: 7035725
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: April 25, 2006
    Assignee: Hydro-Aire, Inc.
    Inventors: Duk-Hyun Park, Robert D. Cook
  • Publication number: 20060080021
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Application
    Filed: May 4, 2005
    Publication date: April 13, 2006
    Inventors: Duk-Hyun Park, Robert Cook
  • Patent number: 7013208
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Grant
    Filed: January 8, 2004
    Date of Patent: March 14, 2006
    Assignee: Hydro-Air, Inc.
    Inventors: Duk-Hyun Park, Robert D. Cook
  • Publication number: 20040140715
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Application
    Filed: January 8, 2004
    Publication date: July 22, 2004
    Inventors: Duk-Hyun Park, Robert D. Cook
  • Patent number: 6752353
    Abstract: The optimal control design for antiskid brake control uses a discrete Kalman filter scheme in combination with a conventional aircraft brake control system, comprising sensors for measuring a speed of a wheel and brake torque, and for providing output signals indicative of the speed and torque values, and an optimal antiskid braking controller. The optimal antiskid brake controller includes a wheel speed filter, a reference velocity module, an optimal controller, and an integrator module. The optimal controller includes a discrete Kalman regulator utilizing a discrete Kalman filter, which compels the wheel velocity to quickly converge to the reference velocity, while the integrator produces appropriate antiskidding control and compensates for low frequency torque disturbances. The discrete Kalman filter estimates brake pressure, and the difference between the wheel velocity and a reference velocity, and these estimated states are regulated by a control feedback gain matrix.
    Type: Grant
    Filed: November 18, 2003
    Date of Patent: June 22, 2004
    Assignee: Hydro-Aire, Inc.
    Inventor: Duk-Hyun Park
  • Publication number: 20040069902
    Abstract: The optimal control design for antiskid brake control uses a discrete Kalman filter scheme in combination with a conventional aircraft brake control system, comprising sensors for measuring a speed of a wheel and brake torque, and for providing output signals indicative of the speed and torque values, and an optimal antiskid braking controller. The optimal antiskid brake controller includes a wheel speed filter, a reference velocity module, an optimal controller, and an integrator module. The optimal controller includes a discrete Kalman regulator utilizing a discrete Kalman filter, which compels the wheel velocity to quickly converge to the reference velocity, while the integrator produces appropriate antiskidding control and compensates for low frequency torque disturbances. The discrete Kalman filter estimates brake pressure, and the difference between the wheel velocity and a reference velocity, and these estimated states are regulated by a control feedback gain matrix.
    Type: Application
    Filed: November 18, 2003
    Publication date: April 15, 2004
    Inventor: Duk-Hyun Park
  • Patent number: 6684147
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Grant
    Filed: December 17, 2001
    Date of Patent: January 27, 2004
    Assignee: Hydro-Aire, Inc.
    Inventors: Duk-Hyun Park, Robert D. Cook
  • Patent number: 6659400
    Abstract: The optimal control design for antiskid brake control uses a discrete Kalman filter scheme in combination with a conventional aircraft brake control system, comprising sensors for measuring a speed of a wheel and brake torque, and for providing output signals indicative of the speed and torque values, and an optimal antiskid braking controller. The optimal antiskid brake controller includes a wheel speed filter, a reference velocity module, an optimal controller, and an integrator module. The optimal controller includes a discrete Kalman regulator utilizing a discrete Kalman filter, which compels the wheel velocity to quickly converge to the reference velocity, while the integrator produces appropriate antiskidding control and compensates for low frequency torque disturbances. The discrete Kalman filter estimates brake pressure, and the difference between the wheel velocity and a reference velocity, and these estimated states are regulated by a control feedback gain matrix.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: December 9, 2003
    Assignee: Hydro-Aire, Inc.
    Inventor: Duk-Hyun Park
  • Publication number: 20030120413
    Abstract: The sliding, integral, and proportional controller for providing aircraft antiskid braking control includes a reference velocity subsystem, a velocity error ratio subsystem, and a main controller subsystem generating a control command output signal indicative of a command braking pressure. The main controller subsystem includes a one dimensional sliding mode controller subsystem to determine an estimated net wheel torque signal, an adaptive threshold subsystem for generating an adaptive threshold based upon the modified slip ratio signal and a clock signal, integral gain subsystems, a proportional controller subsystem, and a pressure limiter. A method for determining braking efficiency of an aircraft braking system independent of the specific conditions is also provided.
    Type: Application
    Filed: December 17, 2001
    Publication date: June 26, 2003
    Inventors: Duk-Hyun Park, Robert D. Cook
  • Publication number: 20030025035
    Abstract: The optimal control design for antiskid brake control uses a discrete Kalman filter scheme in combination with a conventional aircraft brake control system, comprising sensors for measuring a speed of a wheel and brake torque, and for providing output signals indicative of the speed and torque values, and an optimal antiskid braking controller. The optimal antiskid brake controller includes a wheel speed filter, a reference velocity module, an optimal controller, and an integrator module. The optimal controller includes a discrete Kalman regulator utilizing a discrete Kalman filter, which compels the wheel velocity to quickly converge to the reference velocity, while the integrator produces appropriate antiskidding control and compensates for low frequency torque disturbances. The discrete Kalman filter estimates brake pressure, and the difference between the wheel velocity and a reference velocity, and these estimated states are regulated by a control feedback gain matrix.
    Type: Application
    Filed: May 23, 2001
    Publication date: February 6, 2003
    Inventor: Duk-Hyun Park