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족부 종골 절골술 후의 보행중 발목 관절 내외측 하중 변화 연구
김정원(Jeogwo Kim),구승범(Seoungbum Koo),김용철 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
When patients with flat feet complain of ankle joint pain, calf osteotomy alleviates normal arch formation and ankle joint pain in the foot. This effect has been verified through many clinical studies. The purpose of this study is to investigate the mechanical effects of osteotomy on the ankle joint during walking and to analyze the changes in the internal and external loads of the ankle joint during gait. We used the `Anybody` muscle skeleton simulation program and used the recently developed 5 Segment foot model. Walking data of the flat foot subjects were used and simulated by simulating the internal calcaneal osteotomy. In addition, `Reaction Element` was used on both the inside and outside of the joint to measure changes in the internal and external loads of the ankle joint.
스마트카드 데이터를 활용한 도시철도 게이트 지체도 산정
탁화정(Hwa-Jeong Tak),김승범(Seoungbum Kim),이호(Ho Lee) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.4
Seoul metro system, one of the biggest metro systems in the world, has been suffering passenger delay from alighting gate (often boarding gate) particularly during peak hours. Seoul metro operators have sought to alleviate these congestions by the installation of automatic fare collection (AFC) system using RF(Radio Frequency) technology since 1999 but the problem still remains. This study develops a methodology to estimate gate delay only using smart card data from Seoul metro AFC system, where we adopt conventional queuing theory for the estimation. This study first tries to extract platoons with passenger delay at alighting gate. For each selected platoon, conventional queueing theory is applied to estimate total passenger delay. Not only the methodology is validated from video based field data but also 6 day smart card data is examined to analyze time-space distribution of passenger delay across multiple alighting gates, and evaluate feasibility of the delay estimation. We expect this study provides a step-stone for metro operators to control the congestion at the AFC gates based on the delay estimation. By using the methodology proposed in this study, operators easily estimate delay at the AFC gates, evaluate multiple stations synthetically, and make a decision on gate metering strategy.