Patents by Inventor Chang-Jun Choi

Chang-Jun Choi 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: 11989381
    Abstract: A display device includes subpixels on a substrate, position code patterns having a predetermined position code shape, when viewed in a plan view, each position code pattern being disposed at a region between at least two adjacent subpixels, and a pixel-defining layer defining a region where each subpixel is disposed and covering the position code patterns. The plurality of position code patterns are formed in a planar code shape and are configured to reflect light incident through the pixel-defining layer.
    Type: Grant
    Filed: September 26, 2022
    Date of Patent: May 21, 2024
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Gi Na Yoo, Ju Yeon Kim, Won Sang Park, Chang Woo Shim, Seong Jun Lee, Dong Hee Choi
  • Publication number: 20240149109
    Abstract: A knee joint rehabilitation apparatus for a wheelchair includes a rehabilitation apparatus frame having a height corresponding to a length of each of legs of a patient sitting on the wheelchair; an upper leg support disposed at an upper end of the rehabilitation apparatus frame and supporting upper legs of the patient thereon while the patient is sitting on the wheelchair; a lower leg support pivotably connected to the upper leg support, wherein the lower legs of the patient are seated and supported on the lower leg support; and an exercise control unit disposed on the rehabilitation apparatus frame and configured to allow the lower leg support to pivot around a connection portion between the lower leg support and the upper leg support such that the patient performs rehabilitation exercise of the knee joint thereof while sitting on the wheelchair.
    Type: Application
    Filed: January 10, 2022
    Publication date: May 9, 2024
    Applicant: HEXARHUMANCARE CO., LTD
    Inventors: Chang Soo HAN, Ho Jun KIM, Su Hyu PARK, Young Hoon JI, Jeong Ho CHO, Byung Gab RYU, Jeong Gyu PARK, Dong Eun CHOI, Cheol Woong AHN
  • Publication number: 20240136531
    Abstract: A conductive composite material, a method of preparing the same, and a secondary battery including the same. The conductive composite material may increase the proportion of an active material when forming an electrode by chemically bonding a conductive material and a binder to each other. A method of preparing the conductive composite material comprises ionizing carbon-based particles in a predetermined polarity, ionizing PTFE particles in a polarity different from that of the carbon-based particles, and chemically bonding the ionized carbon-based particles and the ionized PTFE particles, which are ionized in different polarities, to each other.
    Type: Application
    Filed: September 20, 2023
    Publication date: April 25, 2024
    Inventors: Seung Min Oh, Sung Ho Ban, Sang Hun Lee, Ko Eun Kim, Yoon Sung Lee, Chang Hoon Song, Hyeong Jun Choi, Jun Myoung Sheem, Jin Kyo Koo, Young Jun Kim
  • Patent number: 11949881
    Abstract: The present invention discloses an encoding apparatus using a Discrete Cosine Transform (DCT) scanning, which includes a mode selection means for selecting an optimal mode for intra prediction; an intra prediction means for performing intra prediction onto video inputted based on the mode selected in the mode selection means; a DCT and quantization means for performing DCT and quantization onto residual coefficients of a block outputted from the intra prediction means; and an entropy encoding means for performing entropy encoding onto DCT coefficients acquired from the DCT and quantization by using a scanning mode decided based on pixel similarity of the residual coefficients.
    Type: Grant
    Filed: April 1, 2021
    Date of Patent: April 2, 2024
    Assignees: Electronics and Telecommunications Research Institute, Kwangwoon University Research Institute for Industry Cooperation, Industry-Academia Cooperation Group of Sejong University
    Inventors: Se-Yoon Jeong, Hae-Chul Choi, Jeong-Il Seo, Seung-Kwon Beack, In-Seon Jang, Jae-Gon Kim, Kyung-Ae Moon, Dae-Young Jang, Jin-Woo Hong, Jin-Woong Kim, Yung-Lyul Lee, Dong-Gyu Sim, Seoung-Jun Oh, Chang-Beom Ahn, Dae-Yeon Kim, Dong-Kyun Kim
  • Publication number: 20240082095
    Abstract: Disclosed is an exoskeleton-type rehabilitation robot system, including: a body part provided on a chair in which a user sits and provided with a robot arm capable of moving left or right based on the user seated on the chair; a conversion part configured to convert a position of the robot arm with respect to the body part; a driving part configured to articulate the robot arm with respect to the body part; and a controller configured to detect a change in a position of the robot arm and control a left or right driving mode of the driving part according to the position of the robot arm. In accordance with such a configuration, the exoskeleton-type rehabilitation robot system of the present invention is provided integrally with a chair, thereby having excellent space utilization. In addition, the user's initial preparation for rehabilitation training is simple, which can improve efficiency.
    Type: Application
    Filed: December 27, 2021
    Publication date: March 14, 2024
    Applicant: HEXARHUMANCAR CO., LTD
    Inventors: Chang Soo HAN, Ho Jun KIM, Su Hyun PARK, Young Hoon JI, Jeong Ho CHO, Byung Gab RYU, Jeong Gyu PARK, Dong Eun CHOI
  • Publication number: 20240050098
    Abstract: In a non-contact pressure measurement system of a balloon catheter and a non-contact pressure measurement method of the balloon catheter using the same, the system includes a chamber part, a balloon, a tube part, a pump part and a displacement sensor. The chamber part stores a saline solution. The balloon is disposed inside of a body and is configured to be expanded with supply of the saline solution. The tube part is configured to connect the chamber part with the balloon. The pump part is configured to control the supply of the saline solution via the tube part. The displacement sensor is configured to measure an amount of the expansion of the tube part expanded with the supply of the saline solution, in a predetermined section of the tube part.
    Type: Application
    Filed: November 1, 2021
    Publication date: February 15, 2024
    Applicants: OSONG MEDICAL INNOVATION FOUNDATION, KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION
    Inventors: Kang Moo LEE, Eun Ju YOO, Min Chul SONG, Chang Jun CHOI, Jin Woo AHN, Geum Joon CHO
  • Patent number: 7893718
    Abstract: High speed multiplexers include a first N-to-1 selection circuit, where N is an integer greater than one, a second N-to-1 selection circuit and an output driver. The first N-to-1 selection circuit is configured to route a true or complementary version of a selected first input signal (from amongst N input signals) to an output thereof in response to a first multi-bit selection signal, where N is an integer greater than one. The second N-to-1 selection circuit is configured to route a true or complementary version of the selected first input signal to an output thereof in response to a second multi-bit selection signal. The output driver includes a pull-up circuit, which is responsive to a signal generated at the output of the first N-to-1 selection circuit, and a pull-down circuit, which is responsive to a signal generated at the output of the second N-to-1 selection circuit.
    Type: Grant
    Filed: August 13, 2009
    Date of Patent: February 22, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung Bae Park, Gun Ok Jung, Young Min Shin, Hoi Jin Lee, Chang Jun Choi, Min Su Kim
  • Patent number: 7705627
    Abstract: A semiconductor device using power gating includes a circuit unit and a current blocking unit. The circuit unit is connected between a first voltage node and a virtual voltage node. The current blocking unit is connected between the virtual voltage node and a second voltage node, and can block a leakage current of the circuit unit in a standby mode. Also, the current blocking unit controls whether or not to connect the virtual voltage node and the second voltage node in response to a plurality of random signals whose logic states are randomly transited when the standby mode is switched to an active mode. The semiconductor device can minimize ground bounce noise and can stably apply a voltage to a circuit storing data in a data retention mode.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: April 27, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Suhwan Kim, Chang-jun Choi
  • Publication number: 20100097097
    Abstract: A semiconductor device using power gating includes a circuit unit and a current blocking unit. The circuit unit is connected between a first voltage node and a virtual voltage node. The current blocking unit is connected between the virtual voltage node and a second voltage node, and can block a leakage current of the circuit unit in a standby mode. Also, the current blocking unit controls whether or not to connect the virtual voltage node and the second voltage node in response to a plurality of random signals whose logic states are randomly transited when the standby mode is switched to an active mode. The semiconductor device can minimize ground bounce noise and can stably apply a voltage to a circuit storing data in a data retention mode.
    Type: Application
    Filed: October 17, 2008
    Publication date: April 22, 2010
    Applicants: Samsung Electronics Co., Ltd., Seoul National University Industry of Foundation
    Inventors: Suhwan Kim, Chang-jun Choi
  • Publication number: 20100039146
    Abstract: High speed multiplexers include a first N-to-1 selection circuit, where N is an integer greater than one, a second N-to-1 selection circuit and an output driver. The first N-to-1 selection circuit is configured to route a true or complementary version of a selected first input signal (from amongst N input signals) to an output thereof in response to a first multi-bit selection signal, where N is an integer greater than one. The second N-to-1 selection circuit is configured to route a true or complementary version of the selected first input signal to an output thereof in response to a second multi-bit selection signal. The output driver includes a pull-up circuit, which is responsive to a signal generated at the output of the first N-to-1 selection circuit, and a pull-down circuit, which is responsive to a signal generated at the output of the second N-to-1 selection circuit.
    Type: Application
    Filed: August 13, 2009
    Publication date: February 18, 2010
    Inventors: Sung Bae Park, Gun Ok Jung, Young Min Shin, Hoi Jin Lee, Chang Jun Choi, Min Su Kim
  • Patent number: 7659773
    Abstract: A semiconductor IC includes a logic block, and a voltage control circuit controlling an operating voltage supplied into the logic block. The voltage control circuit controls the operating voltage to be increased in a stepwise fashion during an initial operation of the logic block.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: February 9, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-Jun Choi, Suhwan Kim
  • Patent number: 7643368
    Abstract: A power control circuit and related method providing power to an output terminal supplying a logic block within a semiconductor integrated circuit are disclosed. The power control circuit includes a power gating circuit providing a main power voltage to the output terminal during a normal operating mode and providing a retention voltage to the output terminal during a data retention mode characterized by the absence of the main power voltage from the logic block, wherein the retention voltage is minimally sufficient to retain data stored in the logic block during the data retention mode.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: January 5, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-Jun Choi, Suhwan Kim
  • Patent number: 7424508
    Abstract: A carry look-ahead adder may include: a carry generation circuit to generate carry propagation bit values and carry kill bit values for M blocks based on an N-bit addend and augend; a block carry circuit to generate block carry signals based upon the bit values; a Manchester-carry-chain configured bit carry circuit to generate first bit carry signals where a block carry exists in each of the M blocks and second carry bit signals where no block carry exists, based on the bit values; a control circuit to generate, independently of a clock enable signal at a logical level, selection-control signals based upon the block carry signals; and a summation selection circuit to select between the first bit carry signals and the second bit carry signals and to add the carry propagation bit values and the selected carry signals.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: September 9, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-Jun Choi
  • Publication number: 20080180157
    Abstract: A semiconductor IC includes a logic block, and a voltage control circuit controlling an operating voltage supplied into the logic block. The voltage control circuit controls the operating voltage to be increased in a stepwise fashion during an initial operation of the logic block.
    Type: Application
    Filed: January 30, 2008
    Publication date: July 31, 2008
    Inventors: Chang-Jun Choi, Suhwan Kim
  • Publication number: 20080165608
    Abstract: A power control circuit and related method providing power to an output terminal supplying a logic block within a semiconductor integrated circuit are disclosed. The power control circuit includes a power gating circuit providing a main power voltage to the output terminal during a normal operating mode and providing a retention voltage to the output terminal during a data retention mode characterized by the absence of the main power voltage from the logic block, wherein the retention voltage is minimally sufficient to retain data stored in the logic block during the data retention mode.
    Type: Application
    Filed: January 7, 2008
    Publication date: July 10, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Chang-Jun CHOI, Suhwan KIM
  • Patent number: 7263563
    Abstract: A bus driving method and apparatus for driving a plurality of buses including a control logic for generating and outputting control signals and bus selection signals, a byte rotator for dividing data from a data source into a data unit, and changing a sequence of the data unit for outputting data selected by a byte-operation, a sign extender controlled by the control signals for outputting the selected data and converting any non-selected data to a sign value, and a bus selection circuit controlled by the bus selection signals to select a bus among a plurality of buses and to load the selected bus with data outputted from the sign extender.
    Type: Grant
    Filed: May 11, 2004
    Date of Patent: August 28, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-Jun Choi
  • Publication number: 20050033868
    Abstract: A bus driving method and apparatus for driving a plurality of buses including a control logic for generating and outputting control signals and bus selection signals, a byte rotator for dividing data from a data source into a data unit, and changing a sequence of the data unit for outputting data selected by a byte-operation, a sign extender controlled by the control signals for outputting the selected data and converting any non-selected data to a sign value, and a bus selection circuit controlled by the bus selection signals to select a bus among a plurality of buses and to load the selected bus with data outputted from the sign extender.
    Type: Application
    Filed: May 11, 2004
    Publication date: February 10, 2005
    Inventor: Chang-Jun Choi
  • Publication number: 20040167957
    Abstract: A carry look-ahead adder may include: a carry generation circuit to generate carry propagation bit values and carry kill bit values for M blocks based on an N-bit addend and augend; a block carry circuit to generate block carry signals based upon the bit values; a Manchester-carry-chain configured bit carry circuit to generate first bit carry signals where a block carry exists in each of the M blocks and second carry bit signals where no block carry exists, based on the bit values; a control circuit to generate, independently of a clock enable signal at a logical level, selection-control signals based upon the block carry signals; and a summation selection circuit to select between the first bit carry signals and the second bit carry signals and to add the carry propagation bit values and the selected carry signals.
    Type: Application
    Filed: February 20, 2004
    Publication date: August 26, 2004
    Inventor: Chang-Jun Choi