In this study, the concentration distribution of radon, we analyzed from 55 house, 37 government office, 54 schoolfrom June 2008-June 2011 in Chungnam area. From the result of surveying indoor radon degree of 146 facilities,the annual average geometric concentration of indoor radon was 69.4Bq/m³, 40.5Bq/m³, 51.4Bq/m³ in house,government office, school respectively. As for distribution of concentration based on seasons, the radonconcentration showed the highest concentration in winter in all facilities. According to the result of the analysisby dividing the construction year, into before 60s, 60-70s, 80-90s and 2000s, the radon concentration was lowerin all the newly constructed facilities. As for difference in radon concentration due to the presence or absence ofbasement, concentration of house, government office and schools having basement was 52.2Bq/m³, 44.5Bq/m³,36.4Bq/m³ that of having no basement was 75.2Bq/m³, 53.6Bq/m³, 67.4Bq/m³ respectively. Place having nobasement tend to show higher concentration.

최근 5년간 우리나라에서 발생한 예인선 오염사고는 총 172건으로 매년 30건 이상이 발생하여 10㎘이상의 기름을 해상에 유출시키고 있다. 사고의 원인이 여러 가지 유형으로 나타나고 있지만 대부분 90%이상이 운 영자가 주의를 기울이면 예방 할 수 있는 오염사고가 많다는 점이다. 그 원인은 노후 된 선박, 고령의 종사 자, 부정기적인 운항과 체계적인 교육이 이루어지지 않고 있으며 또한 관계기관에서의 관심과 정보공유, 현 장소통의 기회가 적다고 볼 수 있다. 이러한 문제점을 개선하기 위해 예인선 종사자에 대한 해양환경보전의 식을 심어 줄 수 있는 예인선 오염사고 감소방안에 대하여 다루어 보고자 한다.

2010년 4월 20일, 반잠수식 시추선 Deepwater Horizon호가 폭발, 침몰하는 사고가 발생하였으며, 이로 인해 490만배럴(약 77.8만톤)의 원유가 미국 멕시코만으로 유출되었다. 이 사고는 석유산업 역사상 가장 규모가 큰 사고로서, 미국 해안경비대, 주정부 및 사고책임자인 BP가 서로 협력하여 적극적으로 사고에 대응하였다. 본 논문에서는 이번 사고대응의 특징으로 1) 연방-주-행위자 통합지휘, 2) 국가사고관리체제 (NIMS)의 시행, 3) 어선을 임시방제정으로 이용하는 프로그램 시행, 4) 과학적 지원에 기초한 대응, 5) 국민의 알 권리 충족에 주력, 6) 정확한 상황인식에 의한 효율적 방제, 7) 사고를 연구개발의 기회로 활용 등에 대하여 살펴보았다.

This paper shows examples of damage cases for corrugated steel plate structures in Korea expressway. There are two representative types of damages. One is a water leak and the other is the deformation of inner section. The results of this study will be useful for future maintenance of corrugated steel plate structures.

There are a lot of difficulty in present inspection that need many inspectors and much time. It is necessary to improve this inspection working environment. So, we developed an inspection system it can solve problems in current visual inspection and it systemize the inspection tasks scientifically. This is an optimized culvert inspection system which enable to measure a surface condition and sectional shape change. it is used various convergence technology such as 3D laser scanning, digital image processing and texture mapping.

A corrugated steel culvert is well used as underpass structure because of its advantages. But many deformed culverts were observed recently. In this paper, we analyzed structural safety of this culvert using 3D laser scanning geometry data, which is called point cloud data. All surface geometry can be built and transformed into the analysis model based on actual geometrical conditions from this data.

Even though a falling-off in durability and a decrease of safety was caused by environmental factors, there are various cases that it is difficult for structure to diagnose and review exactly because of their working condition. In this study, we show an example which is an inspection of a small waterway culvert having three boxes. It will be used helpfully to evaluate a like structure.

In this paper, we developed a performance evaluation system which enables to evaluate surface condition and sectional shape change of structure. We use various convergence technology such as 3D laser scanning, digital image processing and texture mapping. This modular system is quite practicable in matters of many current structures. This system can solve the problems in current visual inspection of structures, and systemize the inspection tasks scientifically.