본 연구에서는 크레인 작업시 발생하는 재해발생 사례를 토대로 호이스트의 중량물 이탈 방지에 대한 연구를 수행하였으며, 안전고리의 결합으로 구성된 종래의 체결방식을 벗어나 구조물의 무게에 의한 자동 체결 및 결합 방식의 후크 및 특수목적을 가진 X-jog를 설계 및 제작하여 현장에 적용하고자 하였다. 주요 기구부의 3차원 상세설계와 구조해석을 통해 Safety Hook와 X-jog의 미소변형과 허용응력 이하의 구조안정성을 확인하였으며, 안전율은 일반적인 구조설계시 고려되는 안전율 1.2를 상회하는 평균 1.5를 나타냄을 확인하였다. 따라서, 본 연구에서의 Safety Hook와 X-jog는 구조물이 호이스트와 크레인에 부착되어 운용되어질시 구조적 안정성은 충분할 것으로 판단된다.

This study was compared each ingredient's local/seasonal change characteristics by analyzing anions and cations, watersoluble ionic components, from the precipitation of Dangjin and Anmyeon-do areas. The samples were collected for 8 months from both spots between the period of April 1, 2002 to November 31, 2002. The precipitation samples were collected continuously through the entire duration of precipitation by using the wet-only automatic samplers. When rain continues to fall over 24 hours or occasionally, we considered those collected from 9 o'clock in the morning for 24 hours as the day's samples. As a method to verify for the reliability of the analyzed data is concerned, we use the ion balance method and the electricity conductance method, was used widely as a way of watching the atmosphere by the WMO (World Meteorological Organization)/GAW (Global Atmosphere Watch). Also, Dangjin and Anmyun-do area confirmed that contains artificial pollutants by analysis of ion concentration data.

The experiment was conducted to determine the effects of enhanced UV-B on growth and differential responses among cultivars in soybean. The soybean cultivars subjected to enhanced UV-B irradiation at daily dose of 11.32 kJ m^-2(UV-B_BE) revealed that the growth was significantly depressed. Plant height, leaf number, leaf area and dry weight were inhibited by UV-B irradiation showing differential responses among cultivars used. Danyeubkong seems to be less sensitive to the enhanced UV-B irradiation, while Keunolkong more sensitive. Reduction of chlorophyll content was also found significantly greater to Keunolkong. Specific leaf weight, an index of leaf thickness, and flavonoid content known as UV-absorbing compounds were significantly increased in Danyeubkong by UV-B, but those in the other cultivars were not significantly affected. The results indicated that there are cultivar differences in the growth and physiological responses to the enhanced UV-B irradiation and specific leaf weight and UV-absorbing compounds in the leaves were highly related to the sensitivity of soybean by UV-B irradiation.