Patents by Inventor Tae-Whan Yoo

Tae-Whan Yoo 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).

  • Publication number: 20030142695
    Abstract: A method for transmitting and receiving leased line data, an apparatus for transmitting leased line data, and an apparatus for receiving leased line data are provided. The method includes storing received leased line data in a FIFO; packing the leased line date stored in the FIFO into the payload of a DSL frame; and transmitting the packed DSL frame. According to the method, leased line data can be transparently transmitted by adding minimum function blocks to the DSL modem, and with the simple circuit structure, the blocks can be integrated into one chip such that no additional external circuits are needed and a low-priced DSL modem chip that can transmit leased line data can be implemented.
    Type: Application
    Filed: July 2, 2002
    Publication date: July 31, 2003
    Inventors: Hoon Lee, Je-Soo Ko, Tae-Whan Yoo
  • Publication number: 20030118058
    Abstract: Disclosed herein is a variable length packet switching system. The variable length packet switching system includes at least two switching means, a plurality of multiplexing units and a plurality of demultiplexing units. The switching means switch ATM cells or variable length packet data in parallel. The multiplexing means are arranged upstream of the switching means for multiplexing data inputted from a line card to the switching means in packet units and dividing a packet into packets of a number corresponding to the number of the switching means. The demultiplexing means are arranged downstream of the switching means for combining packets inputted after being switched in parallel by the at least two switching means and outputting the combined packet converted into a format adequate to the line card.
    Type: Application
    Filed: September 19, 2002
    Publication date: June 26, 2003
    Inventors: Chan Kim, Kyeong Soo Han, Je Soo Ko, Tae Whan Yoo, Jong Hyun Lee
  • Publication number: 20030118135
    Abstract: A clock distribution device for a multiband modem which is capable of recovering a clock from a received signal of a highest-performance one of multiple bands and applying the recovered clock for clocks of the other bands. The clock distribution device recovers a clock from a received signal and distributes the recovered clock to multiple bands. That is, the clock distribution device is adapted to recover a symbol clock or sampling clock of a certain band from a received multiband signal, generate a high-frequency clock on the basis of the recovered clock, generate a highest-frequency clock among clocks necessary to each of the multiple bands on the basis of the generated high-frequency clock, and generate and distribute all the clocks necessary to each of the multiple bands on the basis of the generated highest-frequency clock.
    Type: Application
    Filed: July 8, 2002
    Publication date: June 26, 2003
    Inventors: Hoon Lee, Je-Soo Ko, Tae-Whan Yoo
  • Patent number: 6580542
    Abstract: An automatic dispersion equalization apparatus in a high-speed optical transmission system, which performs continuous automatic dispersion equalization with the help of analog circuits without employing external digital processors by performing automatic compensation of optical fiber chromatic dispersion.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: June 17, 2003
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae-Ho Song, Tae-Whan Yoo, Chang-Soo Park
  • Publication number: 20020080787
    Abstract: Disclosed are a multicasting system and method, for use in a shared memory-based switch, which comprises an input subqueue reading block for reading out data inputted thereto, selecting one bit from an output port bitmap at a time and outputting output port information of one bit and class information as a data stream together with an enable signal; a queue number encoding block for encoding the bitmap type of output port information provided thereto from the input subqueue reading means, creating a queue number of the output subqueues based on the encoded output port information and the class information and outputting the same together with an enable signal; and an output subqueue writing block for writing an assigned non-use address of the output subqueues in a tail address of corresponding output subqueue, responsive to the information from the input subqueue reading means and replacing a subsequent tail address of the corresponding output subqueue with a newly assigned non-use address, thereby writing a
    Type: Application
    Filed: August 27, 2001
    Publication date: June 27, 2002
    Inventors: Chan Kim, Tae-Whan Yoo, Jong-Hyun Lee
  • Publication number: 20020080884
    Abstract: A variable-rate QAM (Quadrature Amplitude Modulation) transceiver of the present invention facilitates data interfacing between a number of bands having different transmission rates by using a number of transmitters and receivers in downstream and upstream, respectively, to provide a symmetric service in which data transmission rate in upstream is equal to that in downstream even under environment of serious channel attenuation of a signal for high frequency. That is, the variable-rate QAM transceiver of the present invention comprises a number of transmitter blocks for providing various transmission rates to the transmitters and a number of receiver blocks for providing various transmission rates to the receivers, for properly adjusting bandwidth allocation of the passband signal bandwidth of a number of transmitters and receivers to enable high speed symmetric data transmission.
    Type: Application
    Filed: May 2, 2001
    Publication date: June 27, 2002
    Inventors: Hoon Lee, Tae-Whan Yoo, Jong-Hyun Lee