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이창우,서준표,강영호,Lee. Changwoo,Seo. Junpyo,Kang. Youngho 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6
본 연구는 조선시대 산사태 발생현황과 특성에 대해서 현시대와 비교 분석하였다. 본 연구에 활용된 역사기록서는 조선왕조실록, 승정원일기, 비변사등록으로 이들 역사기록서에서 산사태, 토석류, 낙석을 포함하는 기록들을 고찰하였다. 조선시대 산사태 발생 원인은 강우가 81%로 가장 높았고, 50년 단위연도별 발생비율은 호우빈도와 유사한 결과로 나타났다. 그리고 월별산사태 발생 피해비율은 8월(30.7%), 7월(22.9%) 9월(18.8%) 순으로 나타났다. 또한 지역별 산사태 발생 피해비율은 강원도(16.3%), 서울(14.4%), 경기도 (13.4%), 경상북도(11.4%), 경상남도(10.9%) 순으로 나타났다. 결론적으로 조선시대의 산사태 특징은 발생원인과 빈발하는 월이 현재와 유사하였다. 또한 지역에 따른 피해발생비율도 유사점은 있었으나, 도심지에서는 다소 차이가 나타났다. 이러한 결과는 미래의 산사태 연구방향 및 정책수립에 대한 기초자료로 활용될 것으로 판단된다. In this study, the characteristic and occurrence on landslide of Joseon Dynasty were analyzed in order to compare with those of the present. Using the historical records on the Annals of Joseon Dynasty(朝鮮王朝實錄). The daily records of royal secretariat of Joseon Dynasty(承政院日記) and Bibyeonsadeungnok(備邊司謄錄), the record of landslide, debris flow and rockfall of Joseon Dynasty was investigated. The major cause of landslide of Joseon Dynasty was rainfall that was occupied by 81%, the ratio of landslide occurrence per 50 years was similar to frequency of torrential rain for same period. The ratio of landslide damage by month was the highest in August(30.7%) and the next was the July(22.9%) and September(18.8%) in order. And the ratio of landslide damage by region was the highest in Kangwon province(16.3%) and the next was the Seoul city(14.4%), Gyeonggi(13.4%), Gyeongbuk(11.4%), Gyeongnam(10.9%) province in order. The result show that causes, occurrence period and the damage ratio by regional on landslide of Joseon Dynasty were similar to those of the present, but there was a little difference in the city area. These results will be helpful to predict landslide trend in the future and set up policy countermeasures for landslide.
Module Type 소형 폰 카메라 렌즈모듈 조립장치 개발
이창우(Changwoo Lee),송준엽(Junyeob Song),하태호(Taeho Ha),이재학(Jaehak Lee),김천호 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
Micro-factory has many advantages but few examples of the commercialization. Because productivity and yield are less considered in micro-factory research. The micro-factory must also ensure productivity and yield in order to be commercialized. In this study commercialization of assembly micro-factory for phone camera lens module is a main goal.
Self-Adjustment Module을 이용한 초소형 폰카메라 레즈모듈 조립기
이창우(Changwoo Lee),송준엽(Junyeob Song),하태호(Taeho Ha),정영상(Yeong-Sang Jeong) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
An alignment error is occurred certainly when parts are assembled. In general, this alignment error is corrected using measuring system and position control. In this case, an assembly machine has a high stiffness that makes a size of machine huge. The purpose of this research is invention of the module that can adjust one part to the order part automatically. The module that has a function of self adjustment only takes a stiffness in assemble direction and can be moved freely in the other direction so this function makes a self adjustment. The self adjustment module reduces the tact time and also diminishes the inferior goods and makes a size of machine small. A self-adjustment module is applied to an assembly machine that assemble a lens module for phone camera.
건설프로젝트의 협업을 위한 Web 기반 정보관리 시스템
이창우(ChangWoo Lee),이광명(KwangMyong Lee),강형석(Hyoungseok Kang),노상도(Sangdo Noh) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
Sharing and reusing of the information during construction are getting more important to enhance the construction productivity. Recently, in order to effectively manage the information BIM (Building Information Modeling) technology has been introduced and applied actively. BIM is a process to create and manage whole information related to the infrastructures throughout four construction stages: planning, design, construction, and maintenance. In addition, a collaboration system between participants in a construction project, such as client, contractor, and structural designer, is required as well as BIM technology. In this paper, the process and data of construction projects were analyzed and web-based information management system for the collaboration of the participants of construction project was designed and developed. The system can support the cooperative decisionmaking of each participant during the overall construction process by the sharing and managing the construction information.
회전형 자동 Pitch 조정 Multi Picker 개발
이창우(Changwoo Lee),송준엽(Junyeob Song),하태호(Taeho Ha),이재학(Jaehak Lee) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Cellular phone camera lens is produced by plastic injection molding process. Plastic injection mold has the gate through that lens mold is filled by molten plastic. Mold gate destroys the lens symmetry so lens has other special quality according to the orientation. Multi picker that can control the pitch has been introduced for productivity elevation. But the multi picker can not control the rotation. In this paper multi picker for lens module assembly is designed to control lens orientation and the pitch simultaneously.
이창우 ( Lee Changwoo ) 한국보건사회연구원 2010 保健社會硏究 Vol.30 No.2
본 연구는 한국복지패널 4차년도 조사자료(2010)를 이용하여 개인의 민영의료보험의 보유가 입원이용에 어떠한 영향을 미치는지 실증 분석하였다. 민영의료보험의 보유와 입원이용이 서로 내생적으로 결정된다는 점을 인지하여 이를 통제하기 위하여 잠재변수와 결합확률분포를 이용한 추정방법을 이용하였다. 분석결과는 입원이용과 관련하여 다수의 민영의료보험을 보유하고 있는 개인의 보험효과가 상대적으로 높을 가능성이 큰 것으로 나타났다. 이는 입원이용의 보험효과가 내생성을 통제하였을 경우 존재 하진 않는다는 이전의 연구결과와 다소 상이하다. 이러한 차이는 개인의 민영의료보험의 보장성 범위를 통제할 수 있는 변수의 이용가능성이 의료이용의 보험효과 분석에서 중요할 수 있음을 보여주고 있다. 한편 민영의료보험을 보유한 개인의 관찰불가능한 요소에 의한 입원이용 가능성은 낮은 것으로 나타났다. 따라서 개인의 역선택 문제는 민영의료보험회사가 저위험군에 대한 선별로 어느 정도 해결하고 있는 것으로 보인다. This study explores the effect of private health insurance on hospitalization using the 4th Korean Welfare Panel Study(KOWEPS). I control the endogeneity of medical use and health insurance with latent variables which affect the decision on medical use and health insurance. The result show that individuals with multiple private health insurance are more likely to be hospitalization while the effect of the unobsevables on the hospitalization are significantly negative. It may imply that private health insurer solve the adverse selection by screening the high risk group.