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신경망을 이용한 휴대전화에 의한 RF 노출 평가 모델의 개발
김수찬,남기창,안선희,김덕원,Kim Soo-Chan,Nam Ki-Chang,Ahn Seon-Hui,Kim Deok-Won 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.10
이동통신 가입자가 증가함으로 인하여 휴대전화로부터 유발되는 전자파 노출 유해성 여부에 대한 논란이 끊임없이 제기되면서 이와 관련한 연구가 국제적으로 활발하게 이루어지고 있다. 휴대전화 사용에 관한 정보로 사용자 본인이 정량적인 전자파 노출량을 직접 알 수 있다면 매우 이상적일 것이다. 그러나 인체에 노출되는 전자파의 양을 직접적으로 측정하는 것은 매우 어렵기 때문에 정확한 노출량을 아는 것은 쉽지 않다. 따라서 본 연구에서는 국내외에서 선행된 연구 결과 및 쉽게 알 수 있는 휴대전화의 모델에 관한 간단한 정보, 사용경향을 이용하여 개인의 휴대전화 전자파의 노출 정도를 제시해 보고자 한다. 휴대전화 사용에 따른 노출 정도를 제시하기 위하여 1일 평균 통화시간, 총 사용기간에 관한 정보와 선행된 연구 결과들을 기반으로 휴대전화 사용시 이격거리와 기울기, 핸즈프리와 안테나의 사용 여부, 휴대전화의 SAR(Specific Absorption Rate), 플립 혹은 폴더형인지 등에 관한 인자들을 이용하였다. 이 인자들을 신경망 회로를 이용하여 노출 정도를 간접적으로 평가하여 사용자에게 제시해 보고자 하였다. The wide and growing use of cellular phones has raised the question about the possible health risks associated with radio-frequency electromagnetic fields. It would be helpful for phone users to blow the exposure levels during cellular phone use. But it is very difficult to recognize the amount of exposure, because measuring accurate level of RF is a difficult matter. In this study, we developed a model to estimate the exposure level and the individual risk of exposure by utilizing the available informations that we can get. We used such parameters as usage time a day, total using period, distance between cellular phone and head, slope of cellular phone, hands-free usage, antenna pulled out or not SAR(Specific Absorption Rate) of cellular phone, and flip or folder type. We proposed a model presenting individual risk of RF exposure from level 0 to 10 by using a neural network.
모발로 분화하는 종양에 대한 임상 및 병리조직학적 소견 -대한피부과학회 피부병리 연구분과위원회 공동연구-
김유찬 ( You-Chan Kim ),강원형 ( Won-Hyoung Kang ),고재경 ( Jai-Kyoung Koh ),김낙인 ( Nack-In Kim ),김방순 ( Bang-Soon Kim ),김상원 ( Sang-Won Kim ),김수남 ( Soo-Nam Kim ),김수찬 ( Soo-Chan Kim ),노영석 ( Young-Suck Ro ),명기범 ( 대한피부과학회 2003 대한피부과학회지 Vol.41 No.9
Background : Data on the clinicopathologic features of hair follicle tumors in Korea are limited. Objective : The purpose was to investigate the clinical and histopathologic characteristics of hair follicle tumors in Korea. Methods : Two hundred sixty four cases of hair follicle tumors seen from 1999 to 2001 in Korea were analyzed clinically and histopathologically. Results and Conclusion : 1. The most common hair follicle tumor in Korea was pilomatricoma(81.0%), followed by trichoepithelioma(6.4%), dilated pore of Winer(3.8%), and proliferating trichilemmal tumor(2.2%). 2. Hair follicle tumors usually occurred as a solitary skin-colored nodule. The most commonly involved site was the face, and the peak age of presentation was 10 to 19. 3. Pilomatricoma usually occurred as a solitary skin-colored nodule. The most commonly involved site was the arm, and more than 50% of tumors occurred before the age of 20. Histopathologically, the tumor was often surrounded by fibrous capsule and was composed of basophilic and shadow cells. It was usually located in the dermis and extended into the subcutis. Retraction spaces between tumor nests and stroma were frequently observed. 4. Trichoepithelioma usually occurred as multiple skin-colored papules on the face. Histopathologically, the tumor was usually located in the dermis with sometimes connected to the epidermis. It frequently showed peripheral palisading. 5. Dilated pore of Winer usually occurred as a solitary brownish to pigmented papule on the face in middle-aged persons. 6. Proliferating trichilemmal tumor occurred as a solitary or multiple tumors. Histopathologically, the tumor was usually surrounded by incomplete fibrous capsule. Tumor cells frequently showed clear cell formation, nuclear atypia, mitosis, peripheral palisading, trichilemmal keratinization, and individual keratinization. (Korean J Dermatol 2003;41(9) : 1177~1186)
Kalman filter를 이용한 비접촉식 응시점 추정 시스템에서의 빠른 머리 이동의 보정
김수찬(Soo Chan Kim),유재하(Jae Ha Yoo),김덕원(Deok Won Kim) 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.6
자연스러운 머리 움직임 하에서 응시점을 추정할 수 있는 시스템을 제안하였다. 이 시스템은 하나의 카메라와 2개의 거울로 구성되어 있으며, 이 거울은 안구에서 눈동자의 영상을 언제나 카메라로 획득할 수 있도록 유지시키는 기능을 한다. 그러나 영상의 획득 속도가 초당 30 프레임이므로 거울의 제어가 빠른 머리 움직임을 보상할 수 없다. 이러한 문제점을 극복하고자 현재 안구 이미지에서 다음 안구 이미지의 위치를 추정하기 위하여 Kalman filter를 적용하였다. 그 결과 수평방향으로 평균 55㎝/s, 수직 방향으로 평균 45㎝/s정도의 속도의 머리 움직임에 대한 보상이 가능하였다. 그리고, 머리 움직임의 공간도 수평 60㎝, 수직 30㎝의 넓은 범위까지 가능하였다. 공간 해상도는 수평과 수직 각각 4.5°와 5°였고, 자연스러운 머리 움직임 아래에서의 응시점의 정확도는 92% 였다. We proposed an eye gaze tracking system under natural head movements. The system consists of one CCD(charge-coupled device) camera and two front-surface mirrors. The mirrors rotate to follow head movements in order to keep the eye within the view of the camera. However, the mirror controller cannot guarantee the fast head movements, because the frame rate is generally 30㎐. To overcome this problem, we applied Kalman filter to estimate next eye position from the current eye image. In the results, our system allowed the subjects head to move 60㎝ horizontally and 40㎝ vertically, with the head movement speed about 55㎝/sec and 45㎝/sec, respectively. And spatial gaze resolutions were about 4.5 degree and 5.0 degree, respectively, and the gaze estimation accuracy was 92% under natural head movements.
Expert Lecture 1-2 : Diagnostic approaches of bullous diseases
김수찬 ( Soo Chan Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Blistering diseases are heterogeneous and include many diverse disorders. Over the past three decades, with the availability of new investigatory techniques and more sophisticated laboratory methods, enormous progress has been made in understanding these diseases. Blistering diseases can be mainly divided into the autoimmune bullous diseases and inherited bullous diseases. To do make a correct diagnosis of these blistering disorders, one should apply four different techniques: the clinical, histological, immunological and molecular biological methods. Histologic methods include H&E stain, immunohistochemical stains and electron microscopic examinations. Immunological methods include direct and indirect immunofluorescence studies, and ELISA. Molecular biological methods include immunoblotting and immunoprecipitation.
김수찬(Soo Chan Kim),이민걸(Min Geol Lee),이정복(Jung Bock Lee) 대한피부과학회 1983 대한피부과학회지 Vol.21 No.1
Sclerosing lymphangitis of the penis is a peculiar disorder characterized by painless, firm, cord-like lesion in the coronary sulcus of the penis. Histologic findings include thickened lymphatic collecting vessels, fibrin thrombi and few inflammatory changes. The etiology is unknown, but the condition is benign and self-limited. We describe herein a 27-year-old man who had a typical painless, tender, firm, cord-like lesion in the coronary sulcus. Histologic findings disclosed a markedly thickened and fibrosed lymphatic vessel with a organizing thrombus. Whatever the cause of thrombi formation, it is prohable that the thrombi formation would be a main pathologic process, followed by the thickening of the vessel wall.