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Nano-sol 적용에 따른 COB Package 광학적 성능 분석
장혁진,이종찬,이승민 한국조명.전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
본 논문에서는 MCPCB에 기반을 둔 COB 패키지의 광학적 특성을 향상시키는 방법들로 Nano-sol을 적용한 세 가지 방법을 제안하였다. 제안된 세 가지의 방법에는 blue chip coating(방법Ⅰ), 형광체에 Nano-sol을 직접적으로 섞는 방법(방법Ⅱ), 그리고 형광체표면에 coating하는 방법(방법Ⅲ)이다. 이 방법들을 적용한 실험 결과, 방법Ⅱ, Ⅲ의 경우 광속값이 약 20%이상 증가하는 결과값을 얻었다. 하지만 연색성이 기존 COB 패키지가 가진 특성보다 약 12%정도 감소한 경향을 보였다. 이에 따라 광속과 연색성을 동시에 향상시킬 수 있는 Nano-sol 적용 방법에 대한 연구가 필요할 것으로 판단된다.
아데노이드 절제술시 사용한 저온의 과산화수소수의 지혈효과
장혁진,백승훈,최철영,강신노,박진복,이원용,김종애 대한이비인후과학회 2003 대한이비인후과학회지 두경부외과학 Vol.46 No.11
Background and Objectives:Adenoidectomy is one of the most comon procedures in the field of otolaryngology, and is to evaluate the hemostatic efficacy of topical application of cold hydrogen peroxide in adenoidectomy. Materials and Method:We randomly divided 120 candidates (aged 3- 14 years) for adenoidectomy into 4 groups, and 3% hydrogen peroxide (3± 2℃), 3% hydrogen peroxide (20± 2℃), 0.05% epinephrine solution (3± 2℃) and 0.05% epinephrine solution (20± 2℃) were applied topically to each group respectively. The time consumed for bleeding control, and the hemostatic findings of adenoidectomy wound at 5 minutes after curetage, 6 hours after operation of each group were compared. Results:The use of cold hydrogen peroxide significantly reduced intraoperative time when compared with uisng other hemostatic agents. And in lied. Conclusion:Cold hydrogen peroxide is a useful agent for hemostasis in adenoidectomy. (Korean J Otolaryngol 2003 ; 46 :946-9)
정신과 문제로 병사용 진단서를 발급받은 환자들의 임상적 특징
장혁진,김학렬,박상학,김상훈,조용래,표경식 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2
Background and Objectives : Most Korean young men should take a military physical examination. This study attempted to search the social, economical and psychological features of Korean youths who have psychiatric problems in taking the military physical examination. So this study was intended to help decide whether the youths enter the military service or not. Materials and Methods : This study analyzed diagnostic features that were grouped by 7 categories (antisocial and borderline personality disorder group, the other personality disorders group, psychosis group, organic mental disorder group, neurosis group, pervasive developmental disorders group, the other groups). The study was conducted from 1994 to May 1999 at Chosun University hospital with about 143 patients who were issued the psychiatric certificate for military affairs. Results : According to the results of the psychiatric examination, the antisocial and borderline personality disorder group had increased more year by year than the other groups. Classified by the residential distribution, the residents of agricultural areas belonged to the psychosis group more than others. Classified by the job distribution, the antisocial and borderline personality disorder group had more gangsters than the other groups. Also the pervasive developmental disorders group included those Who were without an occupation. Classified by visiting companion, those who were included in the antisocial and borderline personality disorder group and pervasive developmental disorders group used to come alone as compared with the other groups. In the case of those who have experienced psychiatric treatment in the past and who have been treated psychiatrically after being given the psychiatric certificate, the psychosis group comprised more than 50% statistically. In the case of the existence of a tattoo and self-injured scars, the antisocial and borderline personality disorder group has more than the others statistically. According to psychological examination, by measure of validity scale of MMPI, the antisocial and borderline personality disorder group appeared as the inverted V shape that L, K value was low and F value was high. And the antisocial and borderline personality disorder group measured by the Pd, Pa measure. Pd, Pa measure value got higher points than the organic mental disorder group statistically. Conclusion : The number of the antisocial and borderline personality disorder patients’ visits increased at the psychiatric hospital year by year and there were many gangsters or persons without regular occupation in that kind of patients’group. And there were many visitors who came by themselves to the hospital. Also they tended to have a tattoo or self-injured scars. And most of patients didn’t do commuting psychiatric care after receiving the psychiatric certificate. In the aspect of the psychological examination, they were likely to exaggerate their symptoms or disguise having psychiatric trouble intentionally.
둥근형 무전극 램프의 페라이트 코어와 냉점의 온도 의존성
장혁진,양종경,김남군,정영일,박대희,Jang, Hyeok-Jin,Yang, Jong-Kyung,Kim, Nam-Goon,Jung, Young-Il,Park, Dae-Hee 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12
Generally Lighting system consists of lamp and luminaire. When a fluorescent lamp is installed in luminaire, power and light output is changed by ambient temperature. Particularly electrodeless lamp depends on the changes that are mercury pressure with amalgam temperature and magnetic properties with ferrite temperature. It has finally influence on optical efficiency. In this study, the temperature change of ferrite and cold spot, vessel are measured at transitional state and then same characteristics are measured with increase of ambient temperature. At transitional state, luminous flux is related to temperature change of cold spot that compare with behavior of mercury pressure and light output. At increase of ambient temperature, we analyzed change that efficiency and electrical, optical characteristics of elecrodeless lamp are related to ferrite core and cold spot temperature.