The Golden Gate Bridge, known as one of the most beautiful bridges in the world, serves 110,000 vehicles per day, connecting San Francisco to inland as a segment of Highway 101 in California. The average peak hour volume over 6,500 vehicles per hour exceeds the traffic capacity of three lanes on each direction. Due to unique function of the bridge as a gateway of San Francisco, the peak directions in the morning and afternoon were explicitly distinguished. Recurrent traffic delay on the peak direction deteriorated level of service during the commute periods and caused user’s inconvenience and traffic accidents. The workers previously used to move plastic delineators to change lane configuration (4-2, 3-3, and 2-4) in several times a day. Neither did it provide prevention nor physical protection from the head-on collision on the bridge section. In January 2015, the Golden Gate Bridge was completely closed for two days to install the moveable median barrier (MMB) system, Road Zipper®, for more effective and safer variable lane management than the previous operation. One-meter section with 30.48 cm wide of highly reinforced concrete barriers are linked to form a continuous barrier wall and the machine lifts and passes the barriers through a conveyor system at a seeds up to 16 km/h. The MMB enables to quickly reverse lane configuration without traffic closure, providing more lanes to the peak direction as well as eliminating head-on collision on the bridge deck by presence of a physical structure. The traffic monitoring study result shows the significant improvement of average speed during peak hours and the regional traffic accident records shows improvement of safety after implementing the MMB on the Golden Gate Bridge. According to the traffic accident records, 13 injuries occurred in five accidents of vehicle collision in two-directions from 2007 to 2014 but no two-way accident has been reported since the operation of the Road Zipper® began. Furthermore, the MMB would be effectively implemented on construction work zones, managed lanes, variable lane management and other traffic operation to improve traffic safety and maximize utilization of roadway facilities.

우리나라는 태권도의 종주국임에도 불구하고 신체활동량과 그에 따른 에너지 소모량에 대한 기초연구가 미흡하며 이에 대한 연구가 시급한 상태이다. 본 연구에서는 센서(SenseWear® PRO2 Armband)를 이용하여 태권도의 신체활동 량을 획득하였고, Inbody 520을 통하여 체성분 데이터를 획득 하였으며, CT로 하체부위(허벅지)를 스캔하여 허벅지 근육면적 데이터를 추출하였다. 획득된 데이터를 이용하여 허벅지 둘레와 근육면적의 상관관계, 허벅지 근육면적과 분 당 에너지 소모량의 상관관계를 분석하였다. 분석결과 실험자 8명의 평균 허벅지 근육면적은 132.79 cm2 였으며, 무 릎뼈(Pattela) 위 20 cm의 평균 허벅지 전체 면적은 178.79 cm2이었다. 실험자들의 허벅지 둘레와 근육면적은 상관 관계가 있는 것으로 나타났다. 실험자들의 평균 분당 에너지 소모량은 6.94 칼로리였으며, 허벅지 근육면적과 평균 분 당 에너지 소모량도 상관관계가 있는 것으로 나타났다.