Sang-Deok Lee

We don’t have enough information about this author to calculate their statistics. If you think this is an error let us know.
Learn More
In this paper, a fuzzy compensation (FC) technique along with the on-line system identification of two actuator systems of a one-wheel robot. Recursive least square (RLS) algorithm is used to identify the system with FIR-typed moving average filters for both a gimbal and a body system. To compensate for uncertainties in the modeling process, a fuzzy(More)
Cavity enhanced spectroscopy, CES, is a high sensitivity direct absorption method that has seen increasing utility in the last decade, a period also marked by increasing requirements for understanding human impacts on atmospheric composition. This paper describes the current NOAA six channel cavity ring-down spectrometer (CRDS, the most common form of CES)(More)
Decreasing stability of power system by voltage instability makes that all power system face with serious problems of stability. That is attributable to the difficulty of controlling the power system. So it is necessary to keep the voltage of load bus in range of the limited level to supply high quality of electric power. Therefore we describe and suggest(More)
The lateral-balancing problem of a single-wheel based robot system has been presented. The basic configuration of the system uses the gyroscopic effect which generates the yawing force as a control input. The friction combined with yawing force enables a robot system to maintain the lateral balance. Although this horizontal configuration gives a better(More)
Experts expect that even though peaceful use of nuclear power including nuclear power plant is less likely to contribute to average annual radiation exposure level, once accidents occur, it will spell a disaster. This paper is to manufacture a bismuth eco-friendly radiation shield which does not contain lead for providing medical support when national(More)
South Korea has recently achieved developed country status with the second largest megacity in the world, the Seoul Metropolitan Area (SMA). This study provides insights into future changes in air quality for rapidly emerging megacities in the East Asian region. We present total OH reactivity observations in the SMA conducted at an urban Seoul site(More)
  • 1