Patents by Inventor Jie-Tae Lee

Jie-Tae Lee 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).

  • pH measurement system using glass pH sensor
    Patent number: 8436621
    Abstract: A pH measurement system using a glass pH sensor includes a power supply applying a voltage to the glass pH sensor through a resistor; a detector detecting the output voltage of the glass pH sensor; and a calculator calculating the pH of a solution based on the detected output voltage. The resistor provides a resistance of at least ten times less than the equivalent internal resistance of the glass pH sensor. The pH measurement system can improve the response rate by reducing the time constant depending on the dynamic characteristics of the glass pH sensor, and it is possible to diagnose whether the pH measurement system is defective or not by calculating the equivalent internal resistance and the supply voltage of the glass pH sensor.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: May 7, 2013
    Assignee: Kyungpook National University Industry-Academic Corporation Foundation
    Inventors: Jie Tae Lee, Dae Ryook Yang, Seung Jae Lee, Su Whan Sung
  • Autotuning method using integral of relay feedback response for extracting process information
    Patent number: 7925362
    Abstract: An autotuning method using an integral of a relay feedback response is disclosed, which obtains an ultimate data and frequency model of a process with greatly removing effects of harmonics by using integral of a relay feedback signal. The autotuning method using an integral of a relay feedback response comprises the first step for integrating a process data; and the second step for removing effects of harmonics after the first step and computing an ultimate gain, a frequency model and a parametric process model.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: April 12, 2011
    Assignee: Kyungpook National University Industry-Academic Corporation Foundation
    Inventors: Jie-Tae Lee, Su-Whan Sung
  • PH MEASUREMENT SYSTEM USING GLASS PH SENSOR
    Publication number: 20100182022
    Abstract: A pH measurement system using a glass pH sensor includes a power supply applying a voltage to the glass pH sensor through a resistor; a detector detecting the output voltage of the glass pH sensor; and a calculator calculating the pH of a solution based on the detected output voltage. The resistor provides a resistance of at least ten times less than the equivalent internal resistance of the glass pH sensor. The pH measurement system can improve the response rate by reducing the time constant depending on the dynamic characteristics of the glass pH sensor, and it is possible to diagnose whether the pH measurement system is defective or not by calculating the equivalent internal resistance and the supply voltage of the glass pH sensor.
    Type: Application
    Filed: January 15, 2010
    Publication date: July 22, 2010
    Applicant: KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: JIE TAE LEE, DAE RYOOK YANG, SEUNG JAE LEE, SU WHAN SUNG
  • Autotuning method using integral of relay feedback response for extracting process information
    Publication number: 20080114472
    Abstract: An autotuning method using an integral of a relay feedback response is disclosed, which obtains an ultimate data and frequency model of a process with greatly removing effects of harmonics by using integral of a relay feedback signal. The autotuning method using an integral of a relay feedback response comprises the first step for integrating a process data; and the second step for removing effects of harmonics after the first step and computing an ultimate gain, a frequency model and a parametric process model.
    Type: Application
    Filed: June 6, 2007
    Publication date: May 15, 2008
    Inventors: Jie-Tae Lee, Su-Whan Sung