Importance Ranking of Accident Factors of Construction Tower Crane by AHP Technique

In Korea construction industry, the increase of tower crane’s usage continuously and the accidents of tower crane are increasing simultaneously. But research on tower crane is insufficient for reducing the tower crane accident. This study aims to derive the importance ranking of accident factors of cab-control tower crane by AHP analysis. AHP survey was conducted on experts such as construction engineer, construction manager, safety engineer, and tower crane operator, who have more than 10-year career. The results of AHP analysis reveal that top ranking factor of cab-control tower crane’s accident is erection work. Therefore, the derived factors should be managed, and the priority measures taken for reducing the tower crane accidents according to the ranking of accident factors.

南韩两个废弃的尾矿中砷和重金属的浓度

未经过处理的废弃尾矿，由于有毒元素，诸如砷（As）和铅（Pb）的扩散，可能导致对生态系统的危害。植物修复是大型矿山废石堆治理使用的方法。采集植物种类样品是在南韩两个废弃的金矿（Au）中进行的。根据美国环保署3050方法（US-EPA，1996）对植物样品进行分类，然后用电感耦合等离子体质谱法（ICP-MS）进行分析。得出植物的浓度和生物累积因素并总结了含有一种以上金属的植物种类。建议生长在Myoungbong尾矿的白杨树是对大规模金尾矿治理具有再种植的潜力。从Duckum尾矿采集的欧洲蕨中得出，砷的累计远远低于记载的超量堆积的植物累积的量，但是，通过每天相关的饮食，可能会对居民的健康造成长期不利的影响。