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Landsat TM 영상자료를 이용한 대청호의 영양상태 평가
한의정,김태근,정동환,천세억,김신조,유순주,황종연,김태승,김명희,Han, E.J.,Kim, K.T.,Jeong, D.H.,Cheon, S.Y.,Kim, S.J.,Yu, S.J.,Hwang, J.Y.,Kim, T.S.,Kim, M.H. 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The objective of this study was to use remotely sensed data, combined with in situ data, for the assessment of trophic state for Daecheong reservoir. Three Landsat TM(Thematic Mapper) imagery data were processed to portray trophic state conditions. The remotely sensed data and the measured data were obtained on 20 June 1995. Regression models have been developed between the chlorophyll-a concentration and reflectance which was converted to Landsat TM digital data. The regression model was determined based on the correlation coefficient which was higher than 0.7 and was applied to the entire study area to generate a distribution map of chlorophyll-a and trophic state. The equation, providing estimates of chlorophyll-a concentration, represented the year-to-year spatial variation of trophic zones in the reservoir. Satellite remote sensing data derived from Landsat TM had been successfully used for trophic slate mapping in Daecheong reservoir.
초음파 치료의 효율성 향상을 위한 초음파 온열 시뮬레이터 개발
유우진,노시철,정동환,박재현,최민주,최흥호,Yu, W.J.,Noh, S.C.,Jung, D.W.,Park, J.H.,Choi, M.J.,Choi, H.H. 대한의용생체공학회 2009 의공학회지 Vol.30 No.5
As many people are westernizing their life style and food consumption habits, a number of patients who have malignant tumors which grow very rapidly and hazardously destroy the human body are increasing. Ultrasonic hyperthermia is not only one of the tumor treatment methods which employs the non-radioactive ultrasonic waves to increase the temperature at the tumor region up to $40\sim45^{\circ}C$ to destroy and suppress tumor cells but also has been proved by many studies. Due to the rapid development of High Intensity Focused Ultrasound(HIFU), the ultrasound hyperthemia extensively boosts its applications in clinical field. For those reasons, Computed simulation factor should be needed before inspection to patients. To prove efficiency of ultrasonic hyperthermia, precise acoustic field measurement considering tissue characteristics and a heating experiment with tissue mimicking material phantom were conducted for effectiveness of simulation program. Finally, in this study, the computer simulation program verified the anticipated temperature effects induced by ultrasound hyperthermia. In the near future, it is hoped that this simulation program could be utilized to improve the efficiency of ultrasound hyperthermia.
Landsat TM 영상자료를 이용한 대청호의 영양상태 평가
유순주,한의정,김태근,정동환,천세역,김신조,황종연,김태승,김명희 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The objective of this study was to use remotely sensed data, combined with in situ data, for the assessment of trophic state for Daecheong reservoir. Three Landsat TM(Thematic Mapper) imagery data were processed to portray trophic state conditions. The remotely sensed data and the measured data were obtained on 20 June 1995. Regression models have been developed between the chlorophyll-a concentration and reflectance which was converted to Landsat TM digital data. The regression model was determined based on the correlation coefficient which was higher than 0.7 and was applied to the entire study area to generate a distribution map of chlorophyll-a and trophic state. The equation, providing estimates of chlorophyll-a concentration, represented the year-to-year spatial variation of trophic zones in the reservoir. Satellite remote sensing data derived from Landsat TM had been successfully used for trophic state mapping in Daecheong reservoir.