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지형 과학 자료 관리를 위한 공개 소프트웨어 기반 Web - GIS 시스템 모델
이희두(Lee Hee-Du),오일석(Oh Il-Seok) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
환경, 생물 다양성, 기상 등의 많은 과학 자료들을 효과적으로 표현하고 관리하기 위해서는 지리 정보를 사용할 필요가 있다. 이러한 자료 관리 주체 대부분은 환경 단체, 지방 단체, 연구 단체들이고 이러한 단체의 수가 많고 지역적으로 분산되어 있다는 특성이 있다. 때문에 고가의 상업용 GIS 소프트웨어에 의존하여 엄청난 외화 지불을 야기하고 국내 GIS 기반 기술의 축적을 어렵게 하는 현재의 국내 상황은 적절치 않다. 본 논문은 이러한 상황을 타개하기 위한 하나의 대안으로서 공개 소프트웨어에 기반한 Web-GIS 시스템 모델을 제안한다. 이 모델에서는 공간 자료 관리를 위해서는 GRASS, 텍스트 및 멀티미디어 자료 관리는 MySQL, 이들을 하나로 통합 운용하고 웹에 접속하기 위해서 GRASSLinks와 CGI를 사용한다.
원형개구부가 있는 강판 전단벽 시스템을 적용한 학교 건축물의 내진성능평가
이유현(Lee, Yu-Hyeon),이수헌(Lee, Swoo-Heon),이희두(Lee, Hee-Du),신경재(Shin, Kyung-Jae) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.1
After the Gyeongju earthquake, school buildings were designated as earthquake shelters. However, the ratio of designed for seismic of domestic school buildings is only 23.2% in Korea, and it is necessary to secure the seismic safety of those. Therefore, in this paper, a target building was selected before the seismic design criteria was established and the seismic performance of the building was evaluated. After the evaluation, reinforcement of the building was carried out using seismic retrofit systems which was previously tested. For this purpose, the evaluation was carried out using OpenSees program and the reliability of the seismic retrofit systems was also verified. In this way, we can more precisely reproduce the response of the building in case of actual earthquake and predict damage of the earthquake in the future.
외적 포스트텐셔닝 보강에서 데비에이터의 위치에 따른 전단보강효과
이수헌(Lee, Swoo-Heon),신경재(Shin, Kyung-Jae),이희두(Lee, Hee-Du) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.6
This paper described the shear strengthening effect by deviator location in pre-damaged reinforced concrete (RC) beams strengthened with externally post-tensioning steel rods. Three reinforced concrete beams as control beam and eight post-tensioned beams using external steel rods were tested to fail in shear. The externally post-tensioning material was a steel rod of 22 mm diameter, and it had a 655 MPa yield strength and an 805 MPa tensile strength. Specimens depend on multiple variables, such as the number of deviators, location of deviator, and load pattern. The pre-damaged loads up to about 2/3 of ultimate shear capacities were applied to specimens using displacement control and the diagonal shear crack just occurred at these loading levels. And then, the post-tensioning up to when a strain of steel rod reaches about 2000 με was continuously applied to beam. A displacement control was changed to a load control during post-tensioning. The post-tensioning resulted in increase of load-carrying capacity and restoration of existing deflection. Also, it prevented the existing diagonal cracks from excessively growing. Two deviators effectively improved the load capacity when compared with in case of test which one deviator at mid-span installed. When deviators were located near region which the diagonal crack occurred on, the strengthening impact by post-tensioning was greater.
손상입은 철근콘크리트 보의 포스트텐셔닝 강봉을 이용한 전단 보강
이수헌(Lee, Swoo-Heon),이희두(Lee, Hee-Du),박성근(Park, Seong-Geun),신경재(Shin, Kyung-Jae) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.1
This experimental investigation was conducted to observe the shear strengthening behavior of pre-damaged reinforced concrete (RC) beams strengthened with externally post-tensioning steel rods. A total of six simply supported beams -two control beams and four post-tensioned beams using external steel rods - were tested to failure in shear. The external steel rods of 18 mm or 28 mm diameter were respectively employed as post-tensioning material. The four post-tensioned beams have a V-shaped profile with a deviator (or saddle pin) located at mid-span, and the post-tensioning system increased the low load-carrying capacity and overcame a little bit of deflection caused by damage. Concretely, the load-carrying capacity and flexural stiffness were respectively increased by about 25~57% and 263~387% due to the post-tensioning when compared with the unstrengthened control beams.