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초음파 영상에 의한 골밀도 측정에서 관심영역의 자동 검출방법
신정식(JungSik Shin),안중환(JungHwan Ahn),한은옥(EunOk Han),김형준(HyungJoon Kim),한승무(SeungMoo Han) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.11
In ultrasonic bone densitometry, the positioning of measurement site is decisive in precision and reproducibility. In this study, automatic Region of Interest (ROI) detection algorithm is suggested and adopted the method using the local minimum value by ultrasonic image. The preprocess before the local minimum method extracts out the bone area and calculates the geometrical information of bone. The developed ROI detection algorithm was applied to the clinical test for the subject of 305 female patients in the range of 22-88 years old. As the results, the accuracy of the algorithm was shown to be 98.3%. It was also found that bone density parameter was significantly correlated with age(r=0.85, p<0.0001).
원전 정책의 전환에 따른 에너지 공급비용 분석에 대한 연구
권종환(Jonghwan Kwon),안중환(Junghwan Ahn),김발호(Balho H. Kim) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.5
후쿠시마 원전 사고 이후 친환경성과 안전성에 대한 사회적 요구가 높아짐에 따라 전 세계적으로 원전 정책 전환에 대한 요구가 커지고 있다. 이러한 정책 전환은 에너지 공급 비용의 증가를 수반하게 되는데, 향후 국가에너지 정책의 수립에 앞서 이에 대한 분석은 필수적일 것이다. 본 논문에서는 제 5차 전력수급기본계획을 기준으로 다양한 에너지정책, 특히 원전 폐기ㆍ유지 및 신재생비율의 증가에 대한 시나리오 분석을 통해 각 정책에 따른 에너지 공급비용을 비교해 보았다.
손성민(SeongMin Son),안중환(JungHwan Ahn) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.11
This paper discusses the minimum cutting thickness with a continuous chip in sub-micrometer order precision diamond cutting. An ultra precision cutting model is proposed, in which the tool edge radius and the friction coefficient are the principal factors determining the minimum cutting thickness. The experimental results verify the proposed model and provide various supporting evidence. In order to reduce the minimum cutting thickness a vibration cutting method is applied, and the effects are investigated through a series of experiments under the same conditions as conventional cutting method.
신정식(JungSik Shin),안중환(JungHwan Ahn),김형준(HyungJoon Kim),김화영(HwaYoung Kim),한승무(SeungMoo Han) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.8
It is very important to obtain a high quality of bone image for an accurate ultrasonic measurement of bone mineral density. In this study, we suggested a technique to acquire an optimal image by adapting an acoustic lens and a properly selected ultrasonic probe. Also, we have applied an image processing algorithm with which automatically makes a decision of brightness and contrast of image by generating threshold level, a composition of ultrasonic data, an elimination of noise using modified median filter, and a real time interpolation. We could confirm much improved resolution of bone image with acoustic lens attached to the ultrasonic probe and with the image processing algorithm suggested in this study. Therefore, it became possible to precisely diagnose the osteoprosis using ultrasonic imaging technique.