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- 저자 : 김수찬 ( Soo-Chan Kim ) (검색결과 156 건)
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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
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.
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적응 SFLC(Scaled Fourier Linear Combiner)를 이용한 활동 중의 PPG 신호의 잡음 감소
金守贊(Soo-Chan Kim),金性珉(Sung-Min Kim),車殷宗(Eun-Jong Cha),金德源(Deok-Won Kim),柳在河(Jae-Ha Yoo),金東淵(Dong-Yon Kim) 대한전기학회 2006 전기학회논문지 D Vol.55 No.3
Blood flow is one of vital signals related to human physiological information. Photoplethysmograph (PPG) has been used to measure indirectly heart rate, blood oxygen saturation (SpO₂), and so on. Because PPG signal is weak and sensitive to motion artifacts, it is very important to continuously obtain stable PPG signal during free movement. In this study, we applied the scaled Fourier linear combiner (SFLC) using both the adaptive filter and FLC to remove effectively the motion artifacts as well as background noise in the real time without additional signal correlated with motion from a accelerometer. The proposed method would be useful to reduce the movement and background noise which are not synchronized with heart rate.
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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.
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김수찬(Soo-Chan Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.1
EMG has specific information which is related to movements according to the activities of muscles. Therefore, users can intuitively control a prosthesis. For this reason, biosignals are very useful and convenient in this kind of application. Bioimpednace also provides specific information about movements like EMG. In this study, we used both EMG and bioimpedance to classify the typical hand gestures such as hand open, hand close, no motion (rest), supination, and pronation. Nine able-bodied subjects and one amputee were used as experimental data set. The accuracy was 98±1.9% when 2 bio-impedance and 8 EMG channels were used together for normal subjects. The number of EMG channels affected the accuracy, but it was stable when more than 5 channels were used. For the amputee, the accuracy is higher when we use both of them than when using only EMG. Therefore, accurate and stable hand motion estimation is possible by adding bioimepedance which shows structural information and EMG together.
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Immunoblot법과 배양각질형성세포의 간접면역형광 검사를 이용한 천포창 항원의 검출
김수찬 ( Soo Chan Kim ),원진형 ( Jin Hyoung Won ),안성구 ( Sung Ku Ahn ) 대한피부과학회 1993 대한피부과학회지 Vol.31 No.3
Background: Pemphigus are chronic autoimmune blistering disorcers characterized by acantholysis. In addition to pemphigus vulgaris(PV), the major clinical variarts are pemphigus foliaceus(PF), paraneoplastic pemphigus(PNP) and drug-induced pemphigus(DP). Detection of pemphigus antigen is important for differential diagnosis as well as research work. Most investigators have identified pemphigus antigens by means of immunoprecipitation using metabolically radiolabeled cultured keratinocytes. However, immunorepitation is generally more expensive, hazardous and time-consuming than immunoblotting. Therefore, establishment of the immunoblotting as a standard technique for the detection of the pemphig us antigens is desirable. Objective : To characterized pemphigus antigens by an immunobloting analysis of human epidermal extract and by indirect itnmunofluroscence study using human of cultured keratinocytes as a substraie. Method : We performed imrnunoblotting analysis af sera from patieiits with PV, PF, PNP and DP with human epidermal extract as a source of antigen. Indirect immunof uorescence study was also performed using human keratinocytes cultured in high or low calcium media for detection of pemphigus antigens. Results : In an immunoblotting analysis, all(9/9) PV sera showed secific reactivities with a 130-KD protein and all(5/5) FF sera showed reactivities with a 150-KK protein, which is most likely desmoglein 1. Furthermore, one of nine PV serum also reacted with a 150-KD protein, which seems to be the identical antigen detected in PF. All PNP(3/3) sera showed reactivities with two protein bands, 210KD and 190KD. In our indirect imrnunofluorescence study using culltured human keratinocytes as a substrate, when keratinocytes were grown in low calcium media, no pimphigus antigens could be detected. However, when grown in high calciurn media, pemphigus vulga ris and paraneoplastic pernphigus antigens were present t the cell-cell contact areas with a puncta;e pattern, whereas pemphigus foliaceus antigen was not, presint in keratinocytes even when cultured in high calcium media. Conclusion : Our results suggests (1) immunoblotting analysis is a reliable technique for defining pemphigus antigen and could be a valuable tool for the differentiation of PV, PF and PNP and(2) PF antigen rnay not be expresseden cultured keratinocytes. (Kor J Dermato 1993; 31(3): 380-388)
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칼슘과 레티노인산이 각질형성세포의 교소체 형성에 미치는 영향
김수찬 ( Soo Chan Kim ),원진형 ( Jin Hyoung Won ) 대한피부과학회 1994 대한피부과학회지 Vol.32 No.5
Background:Desmosomes are adhesive intercellular junctions that form an important component of the junction complexes of epithelial cells. They provide intercellular links between the intermediate filament cytoskeletons of adjacent cells and are thus involved in maintaining the structural integrity of tissues. Objective:Calcium and retinoids are major regulators of epidermal differentiation regulators on desmosomal somponents, i.e., desmoplakin, desmoglein, and pemphigus antigens. Methods:We used monoclonal antibodies against desmoplakin(DP) and desmoglein(DG), and sera from patients with pemphigus vulgaris(PV), pemphigus foliaceus(PF) and paraneoplastic pemphigus(PNP) to study the effects of calcium and retinoic acids, which are major regulators of epidermal differentation, on desmosomal protein formation in human cultured keratinocytes. We performed immunofluorescence, immunoblotting and immunoprecipitation study using human keratinocytes cultured in high calcium media with or without retinoic acid and in low calcium media with or without retinoic acid. Results: 1. In low calcium(0.15mM) media, PV antigen and DG were produced in a small amount and it appeared that these desmosomal proteins was increased and they were assembled at the desmosomal structures located in cell-cell centact margins. 2. PF antigen, which was identical to the DG, were not produced or expressed in cultured keratinocytes even when cultured in high calcium media. 3. PNP antigen and DP were produced in cultured keratinocytes grown in both high and low calcium media but their production was increased in high calcium media and only in high calcium media they were assembled at the desmosomal structures. 4. Retinoic acids induced loosening of cell-cell contacts of cultured keratinocytes and decreased the production of desmosomal proteins. Conclusion:Our results suggests calcium is a major regulator of the production and assembly of desmosomal proteins including pemphigus antigens, but PF sera and monoclonal antibodies against DG show different antigen binding characteristics. It appears that retinoic acids inhibit production of desmosomal proteins. (Kor J Dermatol 1994;32(5):820~831)
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