Approximately 40,000 elevators are installed every year in Korea, and they are used as a convenient means of transportation in daily life. However, the continuous increase in elevators has a social problem of increased safety accidents behind the functional aspect of convenience. There is an emerging need to induce preemptive and active elevator safety management by elevator management entities by strengthening the management of poorly managed elevators. Therefore, this study examines domestic research cases related to the evaluation items of the elevator safety quality rating system conducted in previous studies, and develops a statistical model that can examine the effect of elevator maintenance quality as a result of the safety management of the elevator management entity. We review two types: odds ratio analysis and logistic regression analysis models.

IAI의 IFC를 기반으로 강 교량을 구성하는 부재의 상세 설계 정보를 표현하기 위한 방안을 제시하였다. 이를 위해 먼저 강교 부재 상세 설계와 관련한 설계기준, 구조계산서, 상세설계도면을 분석하여 실무에서 다루어지는 설계 데이터 항목과 이들의 표현방식을 분류하였다. 설계 항목을 기존 IFC 모델로 표현 가능한 것, 추가 모델이 필요한 것으로 나누었고, 보강재, 격벽, 현장 연결부, 그리고 전단연결재를 보다 체계적으로 표현하기 위한 속성 및 위상관계를 정립하였다. 마지막으로 본 연구를 통해 제시된 데이터모델을 기반으로 설계 정보 입력을 위한 프로그램을 구현하였다. 테스트용 교량에 적용하여 물리적 STEP 파일 생성함으로써 제시한 데이터 모델의 논리성을 확인하였다.

Most of systems and components in nuclear power plants (NPPs) are anchored to the concrete structure and other components by means of post installed anchors. In order to develop more accurate seismic analysis model of equipment in NPPs, a deep consideration of concrete-anchor connection behavior is required. In this paper, the nonlinear finite element analysis was conducted for the concrete-anchor connection zone details. From the analysis results including strength and load-displacement relation was derived according to design variables including geometry and material properties.

The typical characteristics of seasonal winds were studied around the Pohang using two-stage (average linkage then k-means) clustering technique based on u- and v-component wind at 850 hpa from 2004 to 2006 (obtained the Pohang station) and a high-resolution (0.5 km grid for the finest domain) WRF-UCM model along with an up-to-date detailed land use data during the most predominant pattern in each season. The clustering analysis identified statistically distinct wind patterns (7, 4, 5, and 3 clusters) representing each spring, summer, fall, and winter. During the spring, the prevailed pattern (80 days) showed weak upper northwesterly flow and late sea-breeze. Especially at night, land-breeze developed along the shoreline was converged around Yeongil Bay. The representative pattern (92 days) in summer was weak upper southerly flow and intensified sea-breeze combined with sea surface wind. In addition, convergence zone between the large scale background flow and well-developed land-breeze was transported around inland (industrial and residential areas). The predominant wind distribution (94 days) in fall was similar to that of spring showing weak upper-level flow and distinct sea-land breeze circulation. On the other hand, the wind pattern (117 days) of high frequency in winter showed upper northwesterly and surface westerly flows, which was no change in daily wind direction.

We have analysed the observed surface and vertical meteorological data to get atmospheric information over the Busan metropolitan area. For this, we have selected 10 days in all season such as spring, summer I(Jangma season), summer II(hot season), autumn and winter. The result which have performed cluster analysis using atmospheric data represented that these days are included to most frequently appeared synoptic cluster. We have simulated wind field around Busan metropolitan area which is assigned as 1km2 using RAMS. The calculated air temperature and the wind speed was similar to the observed the that, and the trends of daily variation showed good agreement. RMSE and IOA also showed reliable value. These results indicated the RAMS is able to simulate and predict detailed atmospheric phenomenon.