휴대폰 카메라용 자동초점 구동기의 충격해석

이성민,김봉석,송준호,이수훈,이혜진,이문구,송준엽,이창우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring's deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned, It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.

2자유도 PI 제어기를 이용한 BLDC 전동기의 벡터제어에 관한 연구

이종현,성낙규,이상집,이승환,오봉환,이훈구,한경희 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

This paper describes the speed control method of BLDC Motor using TDOF PI ( Tow-degree of freedom PI ). PI control method generally used has difficulty in efficient speed control because speed response and load torque response interfere each other. It can't decrease the overshoot of motor speed w rm, and shorten the response time of load torque TL, at the same time according to the step alternation of speed reference w rm. Therefore TDOF PI is applied to BLDC Motor in order to supply these weak points of PI control method in this paper. TDOF PI can get the torque characteristic of short response time as well as stable and prompt speed adjustment by separate control for speed response and load torque response. The results from the tests of C program simulation and system construction show that TDOF PI is superior to PI control system in speed adjustment and load torque response.

매크로/마이크로 레벨 볼트 결합 구조물에서의 실험적/해석적 방법을 통한 시스템 특성 비교

김봉석,이성민,이문구,이수훈,Jun Ni,송준엽,이창우,하태호 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

As the micro technology and miniaturization of a structure and component in the last couple of decades have been concretely realized, the understanding of structural and dynamic characteristics and prediction of dynamic behavior are indispensable to the miniaturized structures and micro machines. This paper shows the effect of dynamic characteristics in bolt-jointed structures by comparing natural frequencies and mode shapes between macro and micro-scale beams through experimental modal analysis and finite element analysis with a1 8 test models by materials, by size, and by joining condition; that is, SS41 and A16061-T651, micro and macro, and monolithic beam and bolt-jointed beam.

동북아 비즈니스 중심지 추진을 위한 세제개편 내용 및 향후 정책방향

이성봉(Lee Seong-Bong) 한국국제조세협회 2003 조세학술논집 Vol.19 No.-

In July 2002, the Korean government announced a comprehensive plan to develop Korea into the business hub of Northeast Asia. This plan included a number of policy instruments to improve the business and living environment in Korea. One item on this policy agenda was the taxation issue. This study deals with the tax reform policy adopted by the Korean government to promote its vision and strategy for building Korea into the business hub of Northeast Asia. Policy makers in the Korean government deliberated over numerous tax policy options for providing companies, especially foreign companies, with a favorable taxation system in Korea. After an in-depth examination of issues such as tax incentives for the regional headquarters of multinational enterprises and overall tax rate reductions for both corporate and income taxes, the Korean government enacted a special law on Economic Free Zones to provide special tax benefits for foreign investors. This study analyses the reasons behind the Korean governments introduction of these special zones and other tax reduction programs for foreign investors, and also presents some suggestions for Koreas future tax reform agenda in light of its vision of becoming the hub of Northeast Asia.

GC-ECD를 이용한 유기염소계 및 Pyrethroid계 농약 동시 분석법

김우성,이선화,김재이,정지윤,이명자,박영채,이영자,정성욱,이봉헌,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.4

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with florisil, and finally analyzed simultaneously the organochlorine and pyrethroid pesticides using GC(ECD). An ultra-2 fused silica capillary column was used to separate and identify the products. The resolution between the last isomeric peak of cypermethrin(59.987min) and the first isomeric peak of flucythrinate(60.043min) was not satisfactory. The last isomeric peak of fenvalerate(62.344min) and the first isomeric peak of fluvalinate(62.397min) were overlapped. Recoveries of soybean sample for the most pesticides were 73.3% to 102.4%. Detection limits were between 0.004 and 0.063 ㎍/㎎ when this method was used.

정신분열병 환자들의 自己灣入에 관한 예비 연구

박성봉,김영미,전성일,이기철,김영훈,정영조,이영렬,이정호,최영민 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.6

목 적 : 정 신분열병 환자의 자기만입 정도에 영향을 미치는 인구학적 변인들 및 질병연관 변인들을 규명해 보고자 하였다. 또한. 환자들의 자기만입과 병식 사이의 연관성. 자기만입과 자존심 사이의 연관성을 알아보고자 하였다. 방 법 : 정신과 의사가 병록지와 면담을 통하여 대상 정신분열병 환자들의 인구학적 변인들 및 질병연관 변인들에 관한 자료를 얻고 환자들의 병식 정도를 평가한 후, 환자들로 하여금 자기보고형의 자기만입 척도와 자존심 척도를 시행하게 하였다. 총 111명의 환자가 연구대상으로 선택되었다. 결과: . 1) 여자가 남자보다 유의하게 높은 자기만입 척도 점수를 나타내었다 2) 질병연관 변인들 중 하위집단 사이에 자기만입 척도 점수의 유의한 차이를 보이는 변은 없었다. 3) 자기만입 척도 점수와 병식 점수 사이에 유의한 상관관계가 없었다. 4) 자기만입 척도 점수와 자존심 척도 점수 사이에 유의한 역상관 관계를 보였다. 결 론 : 본 예비 연구의 결과로 보아 정신분열 병 환자의 병식이 부족한 상태에서도 자기만입이 진행될 수 있으며. 자기만입이 심할수록 환자의 자존심이 저하되는 것으로 생각된다. 또한 여자 환자들이 남자 환자들보다 자기만입에 더 취약한 것으로 생각된다. 따라서 정신분열 병 환자의 이해와 치료를 위하여 자기만입에 관한 지속적인 연구가 필요할 것으로 생각된다. objective : This study was conducted to identify demographic variables and illness related variables which may affect the severity of self-engulfment in the patients with schizophrenia. We also studied the relationship between self-engulfment and insight, and the relationship between self-engulfment and self-esteem. Methods : Data on demographic variables and illness related variables for the subjects were gathered from hospital records and clinical interviews by the psychiatrists. Degree of insight for the subjects was assessed through clinical interviews by the psychiatrists. Degree of self-engulfment and self-esteem for the subjects was assessed from the self-engulfment scale and the self-esteem scale respectively. A total of 111 patients with schizophrenia were selected for statistical analysis. Results 1) The females exhibited significantly higher scores than the males on the self-engulfment scale. 2) There was no illness related variable, which exhibited a significant difference among subgroups on the self-engulfment scale. 3) There was no significant correlation between the self-engulfment scores and the insight 4) There was a significantly inverse correlation between the self-engulfment scores and the self-esteem scores. Conclusion : The results of this preliminary study suggest that self-engulfment may develop despite lack of insight and that there was inverse relationship between self-engulfment and self-esteem in the patients with schizophrenia. It also suggests that females are more subject to self-engulfment than males. So, authors suggest that it is valuable to do further studies of self-engulfment in the patients with schizophrenia.

한국 정신장애의 역학 조사 연구[I] : 각 정신장애의 유병률

조맹제,함봉진,김장규,박강규,정은기,서동우,김선욱,조성진,이준영,홍진표,최용성,박종익,이동우,이기철,배재남,신정호,정인원,박종한,배안,이충경 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.4

Objectives : This study aims to estimate the prevalence of the DSM-IV psychiatric disorders in Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI). Methods : Subjects were selected by taking multi-stage, cluster samples of 7,867 adult household residents, 18 to 64 years of age, in ten catchment areas. Total 78 trained interviewers administered the K-CIDI to the selected respondents, from June 1 to November30,2001. Results : Total 6,275 respondents completed the interview. Some 33.5% of respondents reported at least one lifetime disorder, 20.6% reported at least one-year disorder, and 16.7% reported at least one-month disorder. The most common lifetime disorders were alcohol abuse/dependence (17.24%), nicotine dependence/withdrawal (11.19%), specific phobia (5.16%), and major de-pressive disorder (4.25%). The lifetime prevalence of substance abuse/dependence (0.25%) and schizophrenia (0.16%) was very low. Nicotine and alcohol use disorder showed very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among female than male. Conclusion : The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in distributions of psychiatric disorders across the areas and times were observed.

한국 주요정신장애의 유병률 및 관련요인 : 2006 전국정신질환역학조사

조맹제,장성만,함봉진,정인원,배안,이영문,안준호,원승희,손정우,홍진표,배재남,이동우,조성진,박종익,이준영,김진영,전홍진,이해우 大韓神經精神醫學會 2009 신경정신의학 Vol.48 No.3

Objectives The aims of this study are to estimate the prevalence of the DSM-IV psychiatric disorders in the Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI), and to compare those with previous studies. Methods The Korean Epidemiologic Catchment Area study Replication (KECA-R) was Conducted between August 2006 and April 2007. The sampling of the subjects was carried out across 12 catchment areas. A multistage, cluster sampling design was adopted. The target Population included all eligible residents aged 181o 64 years. Face-to-face interviews were conducted with the Korean version of Composite International Diagnostic Interview (K-CIDI) based on the DSM-IV (N=6,510, response rate=81.7%). Results A total of 6,510 participants completed the interview. The lifetime and 12-month prevalence rates for all types of DSM-IV disorders were 30.0% and 17.3%, respectively. Those of Specific disorders were as follows : 1) alcohol use disorder, 16.2% and 5.6% ; 2) nicotine use disorder, 9.0% and 6.0% ; 3) specific phobia, 3.8% and 3.4% ; 4) major depressive disorder, 5.6% and 2.5% ; and 5) generalized anxiety disorder, 1.6% and 0.8%. Data relating to nicotine and alcohol use disorder revealed a very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among females than males. Conclusion The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in the distribution of psychiatric disorders across the country and times were observed.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

유소년영재의 창의적 성향·창의적사고력·다중지능·도덕성에 관한 탐색

류봉선,이경은,홍성용 韓國英才學會 2011 영재교육연구 Vol.21 No.4

Gifted children cultivate their many talents through experience. For the purpose of revealing the talents or abilities of gifted children, it is necessary to provide them with various types of environment for their exploration from the early stage of their school age. In addition, knowing their concern, aptitude and interest from the early stage of their school age will be much helpful for them to grow, advance and search for their future career path. Accordingly, the purpose of this study is to examine the definitional and cognitive characteristics of gifted children through tests on the creative disposition, creative thinking power, multiple intelligences and morality of gifted children at the early stage of their school age in order to provide basic information on the gifted children studies. Accordingly, 90 gifted children were selected as the participants of this study through observation and recommendation. The result showed much difference between the second grade and the third grade in their creative disposition, creative thinking power, multiple intelligences and morality according to school year. As for the difference according to gender, the second grade female students showed meaningful differences in the sub-domain of creative disposition, multiple intelligences and morality and the third grade showed no differences. Such study result shows that students in upper school year clearly have their own sense of purpose. 영재들은 경험을 통해 많은 재능을 발달시켜나간다. 영재들의 재능 혹은 능력을 최대한 발현시키기 위해서 학령기 초기부터 다양한 환경을 제공하고 탐색할 수 있도록 해야 한다. 또한 영재들이 가진 그들의 관심과 적성 및 흥미를 학령기 초기부터 알 수 있다면 성장하고 발달하며 진로를 탐색하는데 많은 도움이 될 것이다. 따라서 본 연구에서는 학령기 초기에 해당하는 유소년 영재의 창의적 성향·창의적사고력·다중지능·도덕성의 검사를 통해 유소년 영재의 정의적·인지적 특성을 탐색하여 유소년 영재연구의 기초자료로 제공하고자 하는데 목적이 있다. 이를 위해 관찰추천을 통해 선발된 유소년 영재 90명을 대상으로 하였다. 그 결과 창의적 성향·창의적사고력·다중지능·도덕성의 학년에 따른 결과는 2학년과 3학년의 차이가많음을 알 수 있었다. 성별에 따른 차이는 창의적 성향·다중지능·도덕성의 하위영역에서 여학생이 2학년에서 높았으며 3학년은 차이가 없는 결과를 보였다. 이러한 연구결과는 유소년 영재들은 남녀 구분 보다 발달적 이해와 영재의 특성을 고려한 질 높은 적절한 학습 환경의 초기노출이 유능한 인재로의 성장에 도움을 주며, 학년이 높을수록 앞으로 자기 목표의식을 분명히 가지고 있음을 보여주는 결과이다.