역사기록서 고찰을 통한 조선시대 산사태 특성 분석

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.

Level Streaming을 활용한 Rogue-Like 게임에서의 Asynchronous Level Load에 관한 연구

이창우 ( Changwoo Lee ),이재호 ( Jaeho Lee ),안혜령 ( Hearyeong An ),김영종 ( Youngjong Kim ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.1

상태 분류기를 이용한 실시간 공구상태 진단

이창우(Changwoo Lee),박병희(Byeonghui Park),이윤재(Yoonjae Lee) 한국소음진동공학회 2020 한국소음진동공학회 학술대회논문집 Vol.2020 No.11

부하공진주파수를 추종하는 전류원 인버터 및 인터리브 벅 컨버터를 통한 단조용 유도가열 전원시스템 설계

이창우(Changwoo Lee),최승수(Seung-Soo Choi),김인동(In-Dong Kim) 대한전기학회 2018 대한전기학회 학술대회 논문집 Vol.2018 No.-

국내 석회석 광산 수갱 굴착에 의한 통기효과 분석 연구

이창우(Changwoo Lee),응우엔 반득(Nguyen Van Duc),키로 록키 키부야(Kiro Rocky Kubuya),김창오(Chang O Kim) 한국암반공학회 2018 터널과지하공간 Vol.28 No.6

주선풍기가 설치된 통기수갱이 굴착된 국내 석회석 광산에서 수행한 통기수갱의 통기효과 분석결과 자연통기 및 기계통기 효과가 뚜렷하게 나타났다. 수갱을 통하여 입기되는 자연통기량은 최대 11.7 ㎥/s 이었으며 갱내 공기온도의 측정에 의하여 비교적 정확한 정량적 예측이 가능하였다. 선풍기 가동에 의한 배기 통기량은 20.3~24.8 ㎥/s로 통기량의 변동은 갱도내 장비의 이동에 의한 통기특성곡선의 상향이동에 따른 선풍기 운전점의 변화에 의한 결과이므로 통기저항의 저감 노력이 요구된다. 갱구로부터 수갱까지 총 1912 m 갱도내 난류확산계수는 15 ㎡/s, 18 ㎡/s로 나타나 오염물질은 기류보다 상대적으로 빨리 확산되므로 공기질 제어를 위하여 신속한 배기가 요구된다. 따라서 통기용 수갱은 급격히 심부화 및 대형화되고 있는 국내석회석광산의 지속적 개발을 위한 필수적 갱내 환경제어 시설로 권장되어야할 것으로 판단된다. This study was carried out at a local limestone mine to analyze the ventilation efficiency of the shaft equipped with a main fan. The results show that its ventilation efficiency is clearly verified for the natural as well as the mechanical ventilation. The airflow rate of 11.7 ㎥/s was induced by the natural ventilation force and the maximum quantity is almost same as the airflow rate estimated by monitoring the average temperatures in the upcast and downcast air columns. Meanwhile, the airflow rate exhausted by the main fan through the shaft was 20.3~24.8 ㎥/s; variation of the quantity was caused by the upward shift of the mine ventilation characteristic curve due to the frequent movement of the equipment. This indicates efforts are required to reduce the ventilation resistance and raise the quantity supplied by the main fan. The turbulent diffusion coefficients along the 1912 m long airway from the portal to the shaft bottom was estimated to be 15 ㎡/s and 18 ㎡/s. Since these higher coefficients imply that contaminants will be dispersed at a faster velocity than the airflow, prompt exhaust method should be planned for the effective air quality control. The ventilation shaft and main fan are definitely what local limestone mines inevitably need for better working environment and sustainable development.

임베디드 리눅스 기반의 IEEE 802.15.4 패킷 분석기 설계 및 구현

이창우(ChangWoo Lee),조현우(Hyeonwoo Cho),반성준(Sung Jun Ban),김상우(Sang Woo Kim) 제어로봇시스템학회 2007 제어·로봇·시스템학회 논문지 Vol.13 No.12

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.

도로터널 환기설계시 적정 차량항력계수 결정에 관한 연구

이창우(Changwoo Lee),조홍률(Hongryul Cho),박홍채(Hongchae Park) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

Quantifying the drag forces exerted by vehicles is critical for road tunnel ventilation safety design due to the high ratios they account for. Vehicle-induced forces occupy as much as 32~100% of the total ventilation forces acting inside tunnel, while in safety design, drag forces is in the range of 28 to 65% of the mechanical pressure required for the emergency fan. The method adopted in local design guidelines for determining the drag coefficient does not take into account the effects of slip streaming despite of the recommendation by PIARC. This paper aims at analyzing the effects of slip streaming on drag coefficient by varying vehicle type, blockage ratio, inter-vehicle distance and relative air velocity. A total of 192 cases in 4 different target tunnels with 4 levels of service, 2 types of vehicle, 6 different relative air velocities were numerically studied with SOLVENT. Some of the significant results can be summarized as follows: (1) If the inter-vehicle distance is kept constant, drag coefficient remains almost constant with relative air velocity of 5.0~28.3㎧. (2) Effects of slip streaming become more prominent, as traffic density increases and inter-vehicle distance gets shorter. Reduction of drag coefficient reaches 23~39%. However, differences in reduction ratios are not significant among the different vehicle types . (3) In the case of heavy vehicles, reduction in drag coefficient due to decreasing inter-vehicle distance shows linear relationship, while the relationship is not statistically significant for small vehicles. (4) Drag coefficient of small vehicles noticeably increases with higher blockage ratio under the relative air velocity of 5.0~28.3㎧ and the blockage ratio of 1.8~3.6%. However, the trend in heavy vehicles is not consistent, as drag coefficient increases up to the blockage ratio of 7.% and unexpectedly decreases thereafter. (5) The drag coefficient suggested by current local guidelines must be interpreted as its upper limit, and the suggested method for coefficient derivation should be reappraised.

민영의료보험이 입원이용에 미치는 영향

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.

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.