Patents by Inventor Naehyuck Chang

Naehyuck Chang 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).

  • Apparatus and method for controlling fuel cell system using reconfigurable switch network
    Patent number: 10026979
    Abstract: Disclosed herein is an apparatus for controlling a fuel cell system, which includes multiple hot boxes including multiple fuel cell stacks, using a reconfigurable network having linear switching complexity, includes: a power conversion system for supplying outputs of normal stacks among the multiple fuel cell stacks to a load; at least one auxiliary power conversion system for supplying an output of at least one deteriorated stack among the multiple stacks to a load; a reconfigurable switch network for connecting in series or in parallel stacks of any hot box to stacks of another hot box; and a control unit for controlling an operation of the reconfigurable switch network by detecting a state of each of the stacks.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: July 17, 2018
    Assignees: SK INNOVATION CO., LTD., SNU R&DB FOUNDATION
    Inventors: Byung Hee Kang, Seong Je Wu, Kyung Bin Yoo, Naehyuck Chang, Jaemin Kim
  • APPARATUS AND METHOD FOR CONTROLLING FUEL CELL SYSTEM USING RECONFIGURABLE SWITCH NETWORK
    Publication number: 20150270563
    Abstract: Disclosed herein is an apparatus for controlling a fuel cell system, which includes multiple hot boxes including multiple fuel cell stacks, using a reconfigurable network having linear switching complexity, includes: a power conversion system for supplying outputs of normal stacks among the multiple fuel cell stacks to a load; at least one auxiliary power conversion system for supplying an output of at least one deteriorated stack among the multiple stacks to a load; a reconfigurable switch network for connecting in series or in parallel stacks of any hot box to stacks of another hot box; and a control unit for controlling an operation of the reconfigurable switch network by detecting a state of each of the stacks.
    Type: Application
    Filed: March 17, 2015
    Publication date: September 24, 2015
    Inventors: Byung Hee KANG, Seong Je WU, Kyung Bin YOO, Naehyuck CHANG, Jaemin KIM
  • Memory system and method of managing a memory system
    Publication number: 20050081002
    Abstract: A method to reduce consumption of static and dynamic energy in a memory system. The method efficiently reduces dynamic and static energy consumed by the memory system by analyzing factors including characteristics of application programs, hardware performance, and the state of memory address buses, which may affect energy consumption, and by controlling a memory device based on the analysis.
    Type: Application
    Filed: October 13, 2004
    Publication date: April 14, 2005
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Naehyuck Chang, Hojun Shim, Yongsoo Joo, Yongseok Choi, Hyung Lee