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김의선 ( Eui Sun Kim ),김원호 ( Won Ho Kim ) 한국센서학회 2010 센서학회지 Vol.19 No.3
In recent studies, many methods have been studied for mobile robot using magnetic markers on its pathway. This is not influenced by the weather conditions, and makes possible to develop controller with low level processors and simple algorithms. However, the interval between magnets is restricted by the magnetic field intensity and it is impossible to get road information ahead. This paper suggests a method of widening markers and expressing the road information ahead using magnetic markers, and explains a sensor arrangement considering suggested methods. Also, magnetic field analysis was done to investigate the effects of widening magnetic markers with various environments. A small mobile robot was made to figure out the performance of suggested methods, and driving experiments were performed on the straight and curved road with magnetic markers. The results show that the robot moved the prearranged pathway with 0.5cm lateral displacements and stopped at a stop line using magnetic information on the road.
임영철,김의선,김태곤,박철수,김영민 ( Young Cheol Lim,Eui Sun Kim,Tag Gon Kim,Chul Su Park,Young Min Kim ) 한국센서학회 1993 센서학회지 Vol.2 No.1
This paper describes an effort of improving performances of ultrasonic ranging system using V40 microprocessor. Conventional ranging systems are somewhat inaccurate because they do not have capability of compensating changes in medium condition. The novel ranging system overcomes this disadvantage by placing a dummy sensor functioning as a standard calibrating instrument in the same medium and by providing data processing capability using V40 controller. Also data communication between V40 and personal computer via RS232C makes it possible to use the ranging system for varieties of other applications such as analysis of static and dynamic system.
정의헌(Cheang Eui-Heang),문채주(Moon Chae-Joo),김의선(Kim Eui-Sun),장영학(Chang Young-Hak) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.6
There has been a continuous increase in the utilization and utility value of renewable energy such as wind power generation in modern society. Wind condition is the absolute variable to the energy volume in the case of a wind power generation system. For this reason, wind power generators have already been installed in areas where wind velocity is high and the possibility of danger is very low. In other words, instability is likely if the wind velocity in an area is high and where a wind power generation system can be built. On the contrary, low wind velocity is possible in an area with high stability. Therefore, the design and manufacture of a wind power generation system should be carried out in a more complicated topography in order to secure a bigger market. This study examines and suggest how topography affects wind shear by analyzing the measured data in order to predict wind power generation more reliably.
김헌태(Heon-Tea Kim),심관식(Kwan-Sik Shim),남해곤(Hea-Kon Nam),최준호(Joon-Ho Choi),임영철(Yeong-Chul Lim),김의선(Eui-Sun Kim) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.8
이 논문은 이산신호가 연속적으로 입력될 때, 이산신호에서 고속으로 파라미터를 추정하고, 그 결과를 시각화하는 방법에 대해서 기술하고 있다. 이 논문은 이산푸리에변환에서 직접 파라미터를 추정하는 고속파라미터 추정 알고리즘을 적용하여 연속신호에서 파라미터를 추정하고, 추정한 중요 파라미터들을 효율적으로 시각화하는 방법에 대해서 기술하고 있다. 이 논문에서 제안한 연속신호에 대한 저주파 파라미터 추정방법을 3개의 모드를 가진 시험함수에 적용하여 제안한 알고리즘과 시각화의 효율성을 검증하였다. This paper describes a method of visualization and fast estimation of parameter in continuous time signal. The parameter estimation method of this paper directly estimate the parameters on the basis of the discrete Fourier transform. Also, this paper present to efficient visualization method of dominant parameters obtained in continuous time signal. The proposed methods are applied to test functions with three dominant modes. The results show that the proposed methods are highly applicable to parameter estimation and visualization in continuous time signal.