Patents by Inventor Ki Chul Han

Ki Chul Han 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: 12106879
    Abstract: A nano spintronic device for using the spin current of a ferromagnetic material and the spin current of a heavy metal channel. The device includes a lower channel layer, a free layer, a pinned layer, an insulating film layer, and an upper channel layer. When current flows upon application of power, electrons are divided into +y-polarized spins and ?y-polarized spins in the lower channel layer, thereby generating torque in the free layer. The torque switches the magnetization direction of the free layer to an +y-axis direction or an ?y-axis direction so that the free layer stores magnetization information according to the magnetization direction. When current flows in the upper channel layer, the current flows into the pinned layer so that electrons in the pinned layer are divided into +y-polarized spins and ?y-polarized spins. The insulating layer insulates the free layer and the pinned layer from each other.
    Type: Grant
    Filed: November 12, 2021
    Date of Patent: October 1, 2024
    Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Hyun Cheol Koo, Ki Hyuk Han, Dong Soo Han, Ouk Jae Lee, Byoung Chul Min, Hyung Jun Kim
  • Patent number: 9503838
    Abstract: A method and system for communicating between devices according to the present invention are provided. The method for communicating between the devices according to the present invention is used for communicating with a first terminal, and is carried out in a device having a capacitive touch screen. The method includes: detecting a change in capacitance for a specific part of the capacitive touch screen, which occurs by means of the first terminal; and acquiring information transferred from the first terminal on the basis of the detected change in capacitance of the capacitive touch screen. The communicating method using such a touch screen may be easily used for various services such as authenticating terminals or transferring files between local terminals.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: November 22, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Geun Jin, Jin Kyeong Kim, Woo Young Lee, Ki Chul Han, Hyun Kyu Chung, Byung Jae Kwak
  • Publication number: 20140235172
    Abstract: A method and system for communicating between devices according to the present invention are provided. The method for communicating between the devices according to the present invention is used for communicating with a first terminal, and is carried out in a device having a capacitive touch screen. The method includes: detecting a change in capacitance for a specific part of the capacitive touch screen, which occurs by means of the first terminal; and acquiring information transferred from the first terminal on the basis of the detected change in capacitance of the capacitive touch screen. The communicating method using such a touch screen may be easily used for various services such as authenticating terminals or transferring files between local terminals.
    Type: Application
    Filed: August 29, 2012
    Publication date: August 21, 2014
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Sung Geun Jin, Jin Kyeong Kim, Woo Yong Lee, Ki Chul Han, Byung Jae Kwak, Hyun Kyu Chung
  • Publication number: 20140126611
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing ?n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and ?n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying ?n1WM,n1Xn1+j?n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Application
    Filed: October 7, 2013
    Publication date: May 8, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Seung Chan BANG, Jae Ryong SHIM, Ki Chul HAN, Jung Im KIM, Tae Joong KIM
  • Publication number: 20120155311
    Abstract: An apparatus and method for determining the position of a target object in a wireless local area network (WLAN) environment are provided. According to the apparatus and method, it is possible for a user to easily identify each neighboring target object and to precisely select any desired neighboring target object. Therefore, it is possible to improve user convenience.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 21, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Seung-Chan BANG, Young-Hoon KIM, Ki-Chul HAN, Don-Sung OH, II-Gyu KIM
  • Patent number: 6614771
    Abstract: An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: September 2, 2003
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Joong Kim, Seung Chan Bang, Ki Chul Han
  • Patent number: 6577606
    Abstract: There is disclosed an echo cancelling apparatus in a digital mobile communication system and method thereof, which is incorporated in a single chip together with a speech coder, and can improve convergence rate by using an excited signal as an input to n adaptive filter and also obtain a stabilized convergence characteristic while using a NLMS algorithm. The echo canceller according to the present invention uses the excited signal obtained at the speech coder as an input signal to an adaptive filter thereby to lower the Eigenvalues distribution rate of the speech signal, thus providing an improved performance compared to the conventional echo canceller.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: June 10, 2003
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Won Myoung Lee, Song In Choi, Ki Chul Han
  • Patent number: 6449306
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &agr;n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and &agr;n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying &agr;n1WM,n1Xn1+j&agr;n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: September 10, 2002
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Chan Bang, Jae Ryong Shim, Ki Chul Han, Jung Im Kim, Tae Joong Kim
  • Publication number: 20020097779
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &agr;n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and &agr; n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying &agr;n1WM,n1Xn1+j&agr;n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Application
    Filed: March 27, 2001
    Publication date: July 25, 2002
    Applicant: Electronics and Telecommunications Research Center
    Inventors: Seung Chan Bang, Jae Ryong Shim, Ki Chul Han, Jung Im Kim, Tae Joong Kim
  • Patent number: 6222873
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing &agr;n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and &agr;n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence WM,n2 by a second data Xn2 of a n-th block; complex-multiplying &agr;n1WM,n1Xn1+j&agr;n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: April 24, 2001
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Chan Bang, Jae Ryong Shim, Ki Chul Han, Jung Im Kim, Tae Joong Kim
  • Patent number: 5818903
    Abstract: An improved CDMA mobile automatic call simulating method and a simulator therefor which are capable of computing an accurate statistic data by repeating an actual CDMA call attempt and call incoming and by judging the result of the call attempt, which includes a management unit for communicating with the mobile stations and controlling the same in accordance with a previously set protocol, and a connection unit for communicating with the management unit and the mobile stations in accordance with an SDLC in an RS-422 signal method.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: October 6, 1998
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ki-Chul Han, Duck-Bin Im, In-Myoung Jeong, Sang-Cheon Lee, Ki-Hong Kim, Min-Sik Seo, Hyun Lee
  • Patent number: 5627834
    Abstract: An automatic call simulator for simulating call processing capacity and performance between a base station and a mobile station of a CDMA mobile communication system is disclosed. A mobile station has a communication port for serial communication with an external unit. An operating unit controls all the mobile station by operating software, generates the state of each mobile station during simulation and a simulation result, and records simulation result data. An interface unit for interfacing the mobile station with the operation unit is included within a metal box so as not to be influenced by an external electromagnetic wave and has external terminals connected to the mobile station and to the operation unit. The interface unit and the mobile station are connected through the communication port.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: May 6, 1997
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ki-Chul Han, Duck-Bin Im, In-Myoung Jeong, Sang-Cheon Lee
  • Patent number: RE40253
    Abstract: An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination, means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: April 22, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Joong Kim, Seung Chan Bang, Ki Chul Han
  • Patent number: RE40385
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing ?n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and ?n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying ?n1WM,n1Xn1+j?n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Grant
    Filed: September 2, 2004
    Date of Patent: June 17, 2008
    Assignee: Electronics and Telecom Research Institute
    Inventors: Seung-Chan Bang, Jae-Ryong Shim, Ki-Chul Han, Jung-im Kim, Tae-Joong Kim
  • Patent number: RE44530
    Abstract: An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: October 8, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Joong Kim, Seung Chan Bang, Ki Chul Han
  • Patent number: RE44591
    Abstract: An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: November 12, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Joong Kim, Seung Chan Bang, Ki Chul Han
  • Patent number: RE44635
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing ?n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and ?n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying ?n1WM,n1Xn1+j?n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: December 10, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Chan Bang, Jae Ryong Shim, Ki Chul Han, Jung Im Kim, Tae Joong Kim
  • Patent number: RE45237
    Abstract: An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: November 11, 2014
    Assignee: Electronic and Telecommunications Research Institute
    Inventors: Tae Joong Kim, Seung Chan Bang, Ki Chul Han
  • Patent number: RE44507
    Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing ?n1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and ?n2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying ?n1WM,n1Xn1+j?n2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: September 24, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Chan Bang, Jae Ryong Shim, Ki-Chul Han, Jung-im Kim, Tae-Joong Kim