Patents by Inventor Yong Chang

Yong 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).

  • Oil separator and cooling-cycle apparatus using the same
    Patent number: 7386994
    Abstract: Disclosed herein are an oil separator and a cooling-cycle apparatus using the oil separator. To a casing of the separator is connected an inflow tube to supply gaseous refrigerant and oil into the casing for allowing them flowing in a swirl pattern, thereby being separated from each other in a cyclone separation manner. Such a separation manner results in an improved oil separation efficiency.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: June 17, 2008
    Assignee: LG Electronics Inc.
    Inventors: Seung Yong Chang, Yoon Been Lee, Sung Chun Kim, Se Dong Chang
  • TRANSISTOR OF PHASE CHANGE MEMORY DEVICE AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20080128673
    Abstract: A transistor for a phase change memory device includes a semiconductor substrate in which active regions are delimited by an isolation structure. A groove is defined on a surface of a gate forming area of each active region. Portions of the isolation structure, which are adjacent to the gate forming area of the active region, are recessed to expose side faces of the gate forming area of the active region. A gate is formed on the gate forming area of the active region over the gate forming area grooves and exposed side faces thereof as well as the recessed portions of the isolation structure. Junction areas are then formed in the active region on both sides of the gate to complete the transistor of a phase change memory device.
    Type: Application
    Filed: September 14, 2007
    Publication date: June 5, 2008
    Inventors: Heon Yong CHANG, Suk Kyoung HONG, Hae Chan PARK, Nam Kyun PARK
  • METHOD FOR MANUFACTURING PHASE CHANGE MEMORY DEVICE WHICH CAN STABLY FORM AN INTERFACE BETWEEN A LOWER ELECTRODE AND A PHASE CHANGE LAYER
    Publication number: 20080131994
    Abstract: A phase change memory device is manufactured by forming a sacrificial layer and a hard mask layer on a lower electrode; performing a first etching these layers and forming on the lower electrode a first stack pattern having a first width less than a width of the lower electrode; performing a second etching the first stack pattern and forming a second stack pattern having a second width less than the first width; forming an insulation to cover the second stack pattern; CMPing the insulation layer to expose the sacrificial layer; removing the sacrificial layer to define a contact hole; forming a lower electrode contact in the contact hole; and forming a phase change layer and an upper electrode on the insulation layer including the lower electrode contact. By manufacturing the phase change memory device in this manner, the size of the contact hole can be decreased and uniformly defined.
    Type: Application
    Filed: September 14, 2007
    Publication date: June 5, 2008
    Inventor: Heon Yong CHANG
  • PHASE CHANGE MEMORY DEVICE HAVING A UNIFORM SET AND RESET CURRENT
    Publication number: 20080117668
    Abstract: A phase change memory device having a uniform set and reset current includes a first and second sense amplifiers that are respectively placed adjacent to both ends of a plurality of active regions. The active regions include a first active region and a second active region. The first active region has a first area having a first width, a second area having a second width greater than the first width, and a third area having a third width greater than the second width and are sequentially arranged in a direction extending toward an area adjacent to the first sense amplifier. The second active region has a first area having a first width, a second area having a second width greater than the first width, and a third area having a third width greater than the second width, which are sequentially arranged in a direction extending toward an area adjacent to the second sense amplifier.
    Type: Application
    Filed: September 13, 2007
    Publication date: May 22, 2008
    Inventor: Heon Yong CHANG
  • PHASE CHANGE MEMORY DEVICE IN WHICH A PHASE CHANGE LAYER IS STABLY FORMED AND PREVENTED FROM LIFTING AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20080116445
    Abstract: A phase change memory device includes a semiconductor substrate having a plurality of phase change cell regions; a lower electrode formed in each of the phase change cell regions on the semiconductor substrate; an insulation layer formed on the semiconductor substrate to cover the lower electrode and defined with a contact hole which exposes the lower electrode; a heater formed in the contact hole; a conductive pattern formed on the insulation layer to be spaced apart from the heater; a phase change layer formed on the heater, the conductive pattern, and portions of the insulation layer between the heater and the conductive pattern; and an upper electrode formed on the phase change layer. This phase change memory device allows the phase change layer to be stably formed and prevents the phase change layer from lifting.
    Type: Application
    Filed: September 14, 2007
    Publication date: May 22, 2008
    Inventor: Heon Yong CHANG
  • PHASE CHANGE MEMORY DEVICE WITH HOLE FOR A LOWER ELECTRODE DEFINED IN A STABLE MANNER AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20080116443
    Abstract: A phase change memory device is manufactured by forming a first insulation layer on a semiconductor substrate having a plurality of phase change cell forming regions; defining a groove by etching the first insulation layer; forming a lower electrode in the groove; recessing the lower electrode; forming a second insulation layer on the recessed lower electrode to fill the groove; etching the second insulation layer and to define a hole for exposing the lower electrode; forming a lower electrode contact in the hole; and forming a phase change layer and an upper electrode on the lower electrode contact. By manufacturing the phase change memory device in this manner, the interface between the lower electrode contact and a phase change layer can be defined in a stable manner, resulting in the uniformity of a programming circuit.
    Type: Application
    Filed: September 13, 2007
    Publication date: May 22, 2008
    Inventors: Heon Yong CHANG, Suk Kyoung HONG
  • Phase change memory device with ensured sensing margin and method of manufacturing the same
    Publication number: 20080101111
    Abstract: Disclosed is a phase change memory device including: a semiconductor substrate having a plurality of bar-type active areas; a plurality of word lines arranged in a direction perpendicular to the active areas on the semiconductor substrate and in which a first pair of the word lines connected to each other at each first end thereof is arranged alternately with a second pair of the word lines connected to each other at each second end thereof opposite to the first end; source areas and drain areas formed in the active areas; common source areas, each connected to the source areas; a plurality of lower electrodes connected to the respective drain areas; phase change layers making contact with every two diagonally adjoining lower electrodes; upper electrodes formed on the phase change layers; and bit lines arranged in a direction of the active areas and be connected to the upper electrodes.
    Type: Application
    Filed: December 29, 2006
    Publication date: May 1, 2008
    Inventor: Heon Yong Chang
  • PHASE CHANGE MEMORY DEVICE WITH REDUCED UNIT CELL SIZE AND IMPROVED TRANSISTOR CURRENT FLOW AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20080101112
    Abstract: A phase change memory device includes: a semiconductor substrate having active areas; a pair of word lines formed over the active areas and connected with each other at each end thereof; source areas formed in the respective active areas at both sides of the pair of word lines; drain areas formed in the respective active areas between the word lines of the pair of word lines connected with each other at each end thereof; ground lines and cell selection lines formed so as to make contact with the respective source areas respectively; lower electrodes formed so as to make contact with the drain areas; phase change layers and upper electrodes stacked over the respective lower electrodes; and bit lines formed over upper portion of the active areas so as to make contact to the upper electrodes.
    Type: Application
    Filed: July 16, 2007
    Publication date: May 1, 2008
    Inventor: Heon Yong CHANG
  • Artificial nail
    Publication number: 20080099037
    Abstract: Disclosed is an artificial nail having a nail base, the nail base having an upper surface comprising a first plane and one or more second planes abutting the first plane, wherein the first plane and the second plane are arranged to have different tilt angles so that a protruding boundary line is formed between them.
    Type: Application
    Filed: February 15, 2007
    Publication date: May 1, 2008
    Inventor: Sung Yong Chang
  • APPARATUS AND METHOD FOR PROVIDING NEWS SERVICE USING MULTICAST AND BROADCAST SERVICE IN BROADBAND WIRELESS ACCESS SYSTEM
    Publication number: 20080089264
    Abstract: Provided is an apparatus and method for providing a news service using an MBS in a BWA system. In a method for providing a news service from a newsgroup server in a wireless access system, if a user terminal has joined at least one newsgroup, a message for notifying an MBSC of a newsgroup subscription of the user terminal, in order to allocate a newsgroup dedicated MCID to the user terminal. News contents are received from a news provider corresponding to the at least one newsgroup. The received news contents are created into one packet and the resulting news packet is transmitted to the MBSC in real time or at a predetermined period of time.
    Type: Application
    Filed: October 12, 2007
    Publication date: April 17, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jun-Hyung KIM, Nae-Hyun LIM, Yong Chang
  • System and method for synchronizing broadcast/multicast service content frames in a mobile communication system
    Patent number: 7349359
    Abstract: A system and method for synchronizing Broadcast/Multicast Service (BCMCS) traffic in a mobile communication system connected to a BCMCS server. A Packet Data Service Node (PDSN) receives a BCMCS content frame from the BCMCS server, and transmits a corresponding Generic Routing Encapsulation (GRE) packet BCMCS content frame, including a sequence number and a timestamp value indicating when the GRE packet BCMCS content frame is transmitted, to Packet Control Functions (PCF) connected downstream of the PDSN. Each of the PCFs determines whether the GRE packet BCMCS content frame received from the PDSN is valid, based on the sequence number included therein. If the GRE packet BCMCS content frame is valid, the PCF transmits the frame to its lower nodes connected downstream of the PCF, while synchronizing the frame transmission, based on the timestamp value included in the frame.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: March 25, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong Chang, Jun-Hyuk Song, Nae-Hyun Lim, Dae-Gyun Kim, Ji-Hae Yi, Beom-Sik Bae
  • Method for allocating UATI in a mobile communication system for high-speed data transmission
    Patent number: 7346033
    Abstract: A signaling processing method for allocating a UATI (Unicast Access Terminal Identifier) to a given AT (Access Terminal) in a mobile communication system including ANs (Access Networks) each having an BS (Access Network Controller), for communicating by radio with ATs, and at least one DLR (Data Location Register) connected to BSs, for storing a plurality of UATIs, which can be allocated to the ATs, and managing the remaining UATIs that are not allocated. Upon receipt of a UATI Request message from the AT, the BS transmits a UATI Allocate Request message to the DLR. Upon receipt of the UATI Allocate Request message, the DLR allocates one of the remaining UATIs to the AT and transmits a UATI Allocate Response message including the allocated UATI to the BS. Upon receipt of the UATI Allocate Response message, the BS transmits a UATI Allocate message including the allocated UATI to the AT.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: March 18, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yong Chang, Nae-Hyun Lim, Bill Semper
  • System and method for controlling an operational mode of a MAC layer in broadband wireless access communication system
    Patent number: 7346361
    Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: March 18, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-Il Yoon, Tae-Won Kim, Gaun-Hwi Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
  • System and method for controlling an operational mode of a MAC layer in a broadband wireless access communication system
    Patent number: 7343167
    Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: March 11, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-Il Yoon, Tae-Won Kim, Geun-Hwi Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
  • APPARATUS AND METHOD FOR SUPPORTING INTERACTIVE BROADCASTING SERVICE IN BROADBAND WIRELESS ACCESS (BWA) SYSTEM
    Publication number: 20080051026
    Abstract: An apparatus and method for providing an interactive broadcasting service in a Broadband Wireless Access (BWA) system are provided. The method includes receiving content attributes, including a terminal interaction request time index information, and corresponding contents from a content provider; after transmitting the contents to a terminal, sending a burst allocation request message to a Base Station (BS) to allocate an uplink bandwidth to the terminal at the terminal interaction request time; and receiving interactive information from the terminal over the uplink bandwidth allocated to the terminal. The content provider or the service provider can request a response from a plurality of recipients through the MBS service, gather their responses, and reflect the gathered information in the contents.
    Type: Application
    Filed: August 27, 2007
    Publication date: February 28, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jun-Hyung Kim, Nae-Hyun Lim, Yong Chang
  • METHOD FOR PROVIDING PERSONALIZED BROADCASTING SERVICE IN COMMUNICATION SYSTEM
    Publication number: 20080049941
    Abstract: A method for providing personalized broadcasting contents by a transmitting Mobile Station (MS) in a communication system is provided. The method includes sharing a group identifier (ID), which is authority to receive the personalized broadcasting contents, with a receiving MS in advance, transmitting a first message including the group ID to a personalized broadcasting control station, receiving a second message including an encryption key from the personalized broadcasting control station, and encrypting the personalized broadcasting contents using the encryption key and transmitting the encrypted personalized broadcasting contents.
    Type: Application
    Filed: August 23, 2007
    Publication date: February 28, 2008
    Applicant: SAMSUNG ELECTRONICS CO. LTD.
    Inventors: Jun-Hyung KIM, Nae-Hyun LIM, Yong CHANG
  • Signaling method for paging in a mobile communication system for high-speed packet data transmission
    Patent number: 7336628
    Abstract: A signaling method for transmitting packet data including information indicating an MN ID of one target access terminal (AT) among a plurality of ATs from a packet data service node (PSDN) to the target AT in a mobile communication system including a service system connected to the PDSN and a data location register (DLR), a plurality of access systems each having an access network controller (ANC) connected to the service system, and a plurality of access terminals (ATs) for communicating by radio with the access systems. In the signaling method, upon receipt of a message informing the access system of arrival of the packet data, the access system transmits a Paging Request message to the DLR. Upon receipt of the Paging Request message, the DLR storing location information of the plurality of ATs within areas of the plurality of access systems searches a location of the target AT.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: February 26, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong Chang, Nae-Hyun Lim, Bill Semper
  • Method of manufacturing a phase change RAM device utilizing reduced phase change current
    Patent number: 7332370
    Abstract: To effectively lower the current required for changing a phase of a phase change layer in a phase change RAM device, metal pads are formed on a semiconductor substrate, and an oxide layer is formed on the metal pads. Nano-sized copolymer patterns aligned with the metal pads covered by the oxide layer are formed on the oxide layer. The oxide layer is etched to form oxide layer patterns by using the nano-sized copolymer patterns as barrier. The nano-sized copolymer patterns are then removed. A nitride layer is deposited and then etched to expose the oxide layer patterns. The exposed oxide layer patterns are removed to form nano-sized holes exposing the metal pads. Bottom electrodes are then formed in the nano-sized holes. A phase change layer and a top electrode are formed on each of the bottom electrodes.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: February 19, 2008
    Assignee: Hynix Semiconductor Inc.
    Inventors: Heon Yong Chang, Hae Chan Park, Suk Kyoung Hong
  • SYSTEM AND METHOD FOR FAST NETWORK RE-ENTRY IN A BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM
    Publication number: 20080039095
    Abstract: A system and method for fast network re-entry in a broadband wireless access communication system. A mobile station transmits a first message requiring fast network re-entry to a base station and performs the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station. The base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station when succeeding in authentication of the first message, and performs the fast network re-entry together with the mobile station.
    Type: Application
    Filed: October 15, 2007
    Publication date: February 14, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seung-Il YOON, Tae KIM, Jun SONG, Hong CHANG, Tae KIM, Yong CHANG
  • Computer monitor with user interface
    Patent number: D567252
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: April 22, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong-Hoon Choe, Young-Jae Ryu, Woo-Yong Chang