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Cavity-dumping형 Nd:glass laser의 제작 및 특성 조사
차용호,강응철,남창희 한국광학회 1995 한국광학회지 Vol.6 No.2
이득 선폭이 넓고 가공이 쉬원 고출력 제이저의 증폭 이득 매질로 유리한 Nd:glass 이득 매질의 소신호 이득 계수를 측정하고 이 Nd:glass를 이용하여 제작한 cavity-dumping형 레이저의 출력 특성을 조사하였다. 소신호 이득 계수를 측정하기 위해 Nd:glass, Pockels cell, 편광분할기 등을 포함하는 공진기를 구성하였으며, 측정된 소신호 이극 계수는 전기 입력 에너지가 100J일 때 $0.088 cm_{-1}$ 공진기의 왕복 내부 손실은 56%였다. Cavity-dumping형 레이저 공진기는 곡률반경이 2m인 두개의 전반사경과 Nd:glass, Pickels cell, 편광분할기, $\lambda/4$ plate 등으로 구성되었으며 제작된 레이저의 출력 에너지는 전기 입력 에너지가 140J일 때, 최대 0.85J이었고 출력 레이저 펄스폭은 8ns였다. A small signal gain coefficient of Nd:glass was measured and a cavity-dumped laser was constructed. To measure the small signal gain coefficient, we constructed a resonator consisting of Nd:glass, Pockels cell, polarizing beam splitter. The measured small signal gain coefficient was $0.088 cm_{-1}$ when the input energy was 100 J and the round-trip internal loss of the resonator was 56%. The cavity-dumped laser was constructed using Nd:glass. 2 m radius of curvature HR-mirrors, Pockels cell, polarizinig beam splitter and $\lambda/4$ plate. The output energy of cavity-dumped laser was 0.85 J at 140 J input energy and the laser pulse width was 8 ns.s 8 ns.
지역사회 노인의 자살사고에 영향을 미치는 심리사회적 요인 : 전남지역을 대상으로
차용호,김경민,윤보현,강한고은비,시영화,박수희 대한우울조울병학회 2018 우울조울병 Vol.16 No.3
Objectives : The purpose of this study was to examine psychosocial factors influencing suicidal ideation of community dwelling elderly, using the senior community center in Jeonnam Province. Methods : A total of 2,202 subjects (369 males, 1,833 females) were recruited. We evaluated sociodemographic factors, using a self-reporting questionnaire. Subjects completed the Geriatric Depression Scale-Short Form Korean Version (SGDS), Multi-dimensional Scale of Perceived Social Support (MSPSS), Korean version of the General Health Questionale-12 (GHQ-12) and Satisfaction with Life scale (SWLS), to assess psychosocial factors affecting suicidal ideation. Results : Among 2,202 subjects, 179 (8.1%) reported recent suicidal ideation. Self-perceptive health status (p<0.001) and physical disease (p=0.002) revealed differences between two groups. The scores of four scales in the suicidal group were significantly different from the control group: SGDS (p<0.001) and GHQ-12 (p<0.001) were higher, while MSPSS (p<0.001) and SWLS (p<0.001) were lower, in the suicidal ideation group than the control group. Multivariate logistic regression analysis revealed that physical disease (OR 2.575, 95%CI 1.022-6.492), SGDS (OR 1.181, 95%CI 1.120-1.246) and GHQ-12 (OR 1.192, 95%CI 1.108-1.283), were significantly associated with suicidal ideation. Conclusion : Findings support that physical disease, depression, and general mental health may correlate to suicidal ideation in the elderly.