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차량용 DBS 수신을 위한 위성 추적 안테나 제어시스템의 성능 구현
김동철,민경식,Kim, Dong-Cheol,Min, Gyeong-Sik,Arai, Hiroyuki 대한전자공학회 2002 電子工學會論文誌-TC (Telecommunications) Vol.39 No.4
본 논문은 이동하는 차량에서 DBS를 수신하기 위한 위성 추적 안테나 제어시스템의 성능을 기술하고 있다. 이 시스템의 안정도와 추적속도 개선을 위해, 방향센서의 기능이 종래의 좌우 추적 알고리즘에 추가되었다. DBS 수신을 위해 제작된 안테나 시스템의 위성 추적 실험이 고속도로와 도심지역에서 수행되었다. 고속도로에서 측정된 AGC 신호레벨은 TV 시청이 가능한 레벨 이상으로 관측되었다. 따라서 방향센서로 보상된 추적 알고리즘을 가진 하드웨어시스템의 우수한 성능이 확인되었다. This paper describes a performance of a satellite tracking antenna control system for mobile DBS reception. In order to improve the tracking speed and the stability of this system, a directional sensor function is added to a conventional left-right tracking algorithm. The satellite tracking experiments of the fabricated antenna system for the DBS reception were performed at a highway and an urban area. The measured AGC signal level on the highway was observed above the level to watch television. Therefore, an excellent performance of the hardware system with the tracking algorithm compensated for the directional sensor was confirmed.
재배지토양의 화학성이 인삼근중의 당류 및 saponin 함량에 미치는 영향
김동철,장상문,최정 ( Dong Cheol Kim,Sang Moon Chang,Jyung Choi ) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.1
The relationships between the soil chemical properties of ginseng fields and the contents of effective constituents in ginseng roots was investigated. The NO₃-N contents in soils showed highly negative correlations with the contents of total sugar and reducing sugar in ginseng roots. The organic matter contents in soils showed positive correlations with the contents of sugar and ginoside in ginseng roots, while the contents of available phosphorus and exchangeable rations in soils showed highly negative correlations with the those in ginseng roots. For the Production of ginseng root of higher saponin contents, increase of the organic matter contents, and decrease of the contents of available phosphorus and exchangeable rations in soils were recommended.
화상처리에 의한 Gas Tungsten Arc 용접에서의 용융지폭제어에 관한 연구
김동철,이세헌,엄기원,Kim, Dong-Cheol,Rhee, Sehun,Um, Ki-Woan 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.9
The feedback control systems of welding process using visual information can improve weld qualities. However, it is very difficult to get the visual information of weld pool since the light intensity of welding arc is much stronger than that of the weld pool. To explore the possibility of extending the capability of automatic welding machines, a study of a closed loop controlled welding system consisted of a GTA welding machine, a vision system, a stepping motor system and a digital computer was undertaken. Particularly, in this system, a CCD camera with a long wavelength pass filter was used to get a better weld pool image. Subsequently, an image analysis technique has been developed to measure the weld pool width. Using this weld pool width measurement, a colsed loop control system adjusted welding speed to maintain a constant weld pool width.