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초음파 영상의 통계적 특성에 근거한 심내벽 윤곽선 검출
원철호,김명남,조진호,Won, Chul-Ho,Kim, Myoung-Nam,Cho, Jin-Ho 대한의용생체공학회 1996 의공학회지 Vol.17 No.3
The researches to acquire diagnostic parameters from ultrasonic images are advanced with the progress of the digital image processing technique. Especially, the detection of endocardial boundary is very important in ultrasonic images, because endocardial boundary is used as a clinical parameter to estimate both the cardiac area and the variation of cardiac volume. Various methods to detect cardiac boundary are proposed, but these are insufficient to detect boundary. In this paper, an algorithm that detects the endocardial boundary, expanding the cavity region from the center using statistical information, is proposed The value of mean and sty:nd, wd deviation in cavity region is lower than those in muscle re- gion. Therefore, if we define the multiplication of mean and standard deviation as homogeneous coefficient, it can lead to conclusion that the pixels with small variation of these coefficleno are cavity region, and extraction of endocardial boundary from cavity region is possible. The proposed method detected endocardial boundary more effectively than edge based or threshold based method and is robuster to noise than radial searching method that has high dependency for center position.
인터랙티브 TV 컨트롤 시스템을 위한 근적외선 영상에서의 얼굴 검출
원철호 ( Chul Ho Won ) 한국센서학회 2011 센서학회지 Vol.20 No.6
In this paper, a face detection method for interactive TV control system using a new feature, edge histogram feature, with a support vector machine(SVM) in the near-infrared(NIR) images is proposed. The edge histogram feature is extracted using 16-directional edge intensity and a histogram. Compared to the previous method using local binary pattern(LBP) feature, the proposed method using edge histogram feature has better performance in both smaller feature size and lower equal error rate(EER) for face detection experiments in NIR databases.
원철호(Chul Ho Won),노철균(Chul Kyun Ro) 한국센서학회 2002 센서학회지 Vol.11 No.5
In this paper, we investigate the potential for retrieval of morphometric data from three dimensional images of conducting bronchus obtained by X-ray Computerized Tomography (CT) and to explore the potential for the use of rapid prototype machine to produce physical hollow bronchus casts for mathematical modeling and experimental verification of particle deposition models. We segment the bronchus of lung by mathematical morphology method from obtained images by CT. The surface data representing volumetric bronchus data in three dimensions are converted to STL(streolithography) file and three dimensional solid model is created by using input STL file and rapid prototype machine. Two physical hollow cast models are created from the CT images of bronchial tree phantom and living human bronchus. We evaluate the usefulness of the rapid prototype model of bronchial tree by comparing diameters of the cross sectional area bronchus segments of the original CT images and the rapid prototyping-derived models imaged by X-ray CT.
유한 차분법을 이용한 동축 도파관 안테나에 접촉된 생체의 SAR 패턴에 관한 연구
구성모,이창원,원철호,조진호,Koo, Sung-Mo,Lee, Chang-Won,Won, Chul-Ho,Cho, Jin-Ho 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
Nonevasive multifrequency microwave radiometry using coaxial waveguide antenna has been investigated for a homogeneous and four layer human body model. The coupling between coaxial waveguide antenna and a biological object was analyzed by use of the finite-difference time-domain(FDTD) method to obtain the absorbed power patterns in the media. The object studied in this paper was a homogeneous and four-layered lossy medium. The specific absorption rates(SAR) distribution which was corresponding to the temperature distribution was calculated in each region by use of the steady-state response in FDTD method. The SAR pattern of 1.2GHz was compared with that of 1.8GHz.
ISEFT 마이크로센서용 샘플챔버 설계 및 4채널 전해질 분석기의 구현
배상곤,이호신,원철호,채승표,김창수,조병욱,손병기,김명남,조진호 ( Sang Kon Bae,Ho Shin Lee,Chul Ho Won,Seung Pyo Chae,Chang Soo Kim,Byung Wook Cho,Byung Ki Sohn,Myoung Nam Kim,Jin Ho Cho ) 한국센서학회 1997 센서학회지 Vol.6 No.4
In this paper, a sample chamber which provide easy replacement of ISFET sensor and consume only small sample volume for electrolyte analysis is designed and a 4-channel electrolyte analyzer employing 2-point calibration method is implemented. In addition, we proposed sample loading detection circuit for minimizing sample and calibration solutions and implemented it. Developed electrolyte analyzer consists of control system part and flow system part. For the effective control of the developed hardware, system software is developed as three individual routines ; measuring routine, calibration routine and washing routine.
김정훈,김덕규,원철호,이종민,이희중,이나희,윤수영,Kim, Jung-Hun,Kim, Deok-Kyu,Won, Chul-Ho,Lee, Jong-Min,Lee, Hee-Jung,Lee, Na-Hee,Yoon, Su-Young 대한의용생체공학회 2012 의공학회지 Vol.33 No.1
The audio vision system was developed for visually impaired people and usability was verified. In this study ten normal volunteers were included in the subject group and their mean age was 28.8 years old. Male and female ratio was 7:3. The usability of audio vision system was verified by as follows. First, volunteers learned distance of obstacles and up-down discrimination. After learning of audio vision system, indoor and outdoor walking examination was performed. The test was scored by ability of up-down and lateral discrimination, distance recognition and walking without collision. Each parameter was scored by 1 to 5. The results were 93.5 +- SD(ranges, 86 to 100) of 100. In this study, we could convert visual information to auditory information by audio-vision system and verified possibility of applying to daily life for visually impaired people.