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김정원,박인선,이영준,김유창,김필자,강동묵,이채언 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2
Objectives : To report cubital tunnel syndrome due to repetitive motions. Methods : A worker complaining muscle weakness and atrophy of the right hand intrinsic muscles admitted to a hospital. We evaluated him with blood tests, neurophysio-logic studies (NCV & EMG), plain X-ray and US at the both elbows. We investigated his occupational history, and videotaped his work motions based on the work cycle at his previous work site. Finally, an ergonomics expert analyzed the motions using rapid upper limb assessment (RULA). Results : NCV & EMG studies reveals slow conduction velocity on both ulnar nerve across the elbow, more severely in the right side. US shows us compatible finding with diffuse neuritis of both ulnar nerves at both elbows. RULA score is 7. Conclusion : We confirmed that the worker's symptoms were related to his previous jobs demanding repetitive motions using the elbow joints. It is necessary that we should prepare appropriate measures to evaluate, prevent, rehabilitate, and help injured workers to return to work.
Segmentation of Liver Regions in the Abdominal CT Image by Multi-threshold and Watershed Algorithm
Kim, Pil-Un,Lee, Yun-Jung,Kim, Gyu-Dong,Jung, Young-Jin,Cho, Jin-Ho,Chang, Yong-Min,Kim, Myoung-Nam Korea Multimedia Society 2006 멀티미디어학회논문지 Vol.9 No.12
In this paper, we proposed a liver extracting procedure for computer aided liver diagnosis system. Extraction of liver region in an abdominal CT image is difficult due to interferences of other organs. For this reason, liver region is extracted in a region of interest(ROI). ROI is selected by the window which can measure the distribution of Hounsfield Unit(HU) value of liver region in an abdominal CT image. The distribution is measured by an existential probability of HU value of lever region in the window. If the probability of any window is over 50%, the center point of the window would be assigned to ROI. Actually, liver region is not clearly discerned from the adjacent organs like muscle, spleen, and pancreas in an abdominal CT image. Liver region is extracted by the watershed segmentation algorithm which is effective in this situation. Because it is very sensitive to the slight valiance of contrast, it generally produces over segmentation regions. Therefore these regions are required to merge into the significant regions for optimal segmentation. Finally, a liver region can be selected and extracted by prier information based on anatomic information.
Kim, Moon Chan,Kang, Joon Ki,Kim, Dae Jo,Kim, Dal Soo,Jung, Chul Ku,Song, Jin Un,Huh, Pil Woo,Park, Chun Kun CATHOLIC MEDICAL CENTER 1988 Bulletin of the Clinical Research Institute Vol.16/17 No.1
To evaluate the biomechanical changes, cerebral blood flow and somatosensory evoked potentials (SEPs) in hydrocephalic brain, this study was designed to determine the regional cerebral blood flow (rCBF), the pressure volume index (PVI) and the resistance to the absorption of cerebrospinal fluid (Ro) in different stages of the kaolin-induced hydrocephalus. The significant decreases in rCBF were revealed in both frontal and periventricular area and a close correlation between SEPs and ventricular enlargement at the each stage of hydrocephalic cats. It is assuming that some microcirculatory impairment in the brain parenchyma is playing an important role which facilitates ventricular expansion with changes of biomechanical property of the brain and the presence of damages in pre-synaptic medial lemniscus-thalamocortical pathways.
The enhance of the choroidal vessels in the fluorescein angiographic image
Pil Un Kim,Yun-jung Lee,Jin Ho Cho,Myoung Nam Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we proposed the enhancing procedure of the choroidal vessels in a FAG(Fluorescein Angiographic) image. Without a calibration of FAG images, it is impossive to apply DAS (Digital Subtraction Angiography) to the FAG analysis because the image is the projected image and it is changed by the eye ball movement. To calibrate the FAG images, we considered the shape of retina. Although FAG image is in 2-dimensional space, retina is hemi-sphere. In other word, FAG image is the projected image. Therefore, we transformed the FAG image from spatial domain to LL (Longitute & Latitute) domain. And then, FAG image is fitted by image shifting on LL domain. After the calibrating the FAG images, DAS is applied to enhance the choroide vessel. By the proposed method, we confirmed that choroide vessel is enhenced.
LIVER REGION EXTRACTION IN A CT IMAGE BY WATERSHED ALGORITHM
Pil Un Kim,Yun-jung Lee,Gyu-dong Kim,Myoung Nam Kim 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In this paper, we proposed a liver extracting procedure for computer aided liver diagnosis system. An extraction of liver region is difficult due to interferences of other organs in the abdominal CT image. For this reason, liver region is extracted in ROI. ROI is selected by using the window for measuring the distribution of liver region's Hounsfield Unit in abdominal CT image. The distribution is measured by using an existential probability of liver's value in the window. If the probability of any window exceeded 50%, it would be assigned to ROI. Actually, liver region is not clearly discerned from the adjacent organs as muscle, spleen, and pancreas in abdominal CT image. Liver region is extracted by the watershed segmentation algorithm which is effective in this situation. This segmentation algorithm is very sensitive to the slight variance of contrast. So it generally produces over-segmentation regions. For optimal segmentation these regions are required to merge into the significant regions. Finally, a liver region is selected and extracted by prior information based on anatomic information.
Kim, Hyung-Jin,Kim, Pil Un,Hyeon, Min Gyu,Choi, Youngwoon,Kim, Jeehyun,Kim, Beop-Min The Optical Society 2016 Applied Optics Vol.55 No.26
<P>Dual-depth spectral-domain optical coherence tomography (SD-OCT) enables high-resolution in vivo whole-eye imaging. Two orthogonally polarized beams from a source are focused simultaneously on two axial positions of the anterior segment and the retina. For the detector arm, a 1 x 2 ultrafast optical switch sequentially delivers two spectral interference signals to a single spectrometer, which extends the in-air axial depth range up to 9.44 mm. An off-pivot complex conjugate removal technique doubles the depth range for all anterior segment imaging. The graphics-processing-unit-based parallel signal processing algorithm supports fast two-and three-dimensional image displays. The obtained high-resolution anterior and retinal images are measured biometrically. The dual-depth SD-OCT system has an axial resolution of similar to 6.4 mu m in air, and the sensitivity is 91.79 dB at 150 mu m from the zero-delay line. (C) 2016 Optical Society of America</P>
내접 삼각형을 이용한 2차원 영상에서 곡선의 접선 각도 계측
김필운(Pil Un Kim),이윤정(Yunjung Lee),이기현(Gihyun Lee),김명남(Myoung Nam Kim) 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.2
곡선의 접선 각도는 곡선의 형태와 곡선의 진행 방향을 예측할 수 있는 중요한 특징이다. 그러나 이차원 디지털 영상이 대부분 격자의 형태이기 때문에 곡선의 접선 각도를 예측하는 것은 어렵다. 따라서 본 논문에서는 곡선의 내접 삼각형을 이용하여 곡선의 접선 각도의 계측법을 제안한다.