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낙하 충격을 받는 다점 구속 장치를 착용한 헬기 승무원의 상해도 평가에 관한 연구
이중현(Jung-Hyun Lee),이영신(Young-Shin Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.6
In this paper, a method of modeling seat belts on crew seat during dynamic seat testing was studied. The body segments of the occupant were modeled with joints. The joints consisted with various stiffnesses, dampings, and frictions. Three types of seat belt restraint systems were investigated. The analysis for on the injury assessment of helicopter's crew under drop impact was conducted. The effectiveness of the seat belt system for crashworthiness and safety was evaluated. As the results of impact analysis, head, neck and spine of the crew can be easily damaged in the vertical direction more than the longitudinal direction. Based on the verified model, behavior of human body was studied with three-point restraint systems. The displacement and injury level of the 12-point restraint system was the smallest.
이중현(Lee, Jung-Hyun),이선봉(Lee, Seon-Bong) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.2
초기 도시철도는 수송수단으로서의 역할만 요구되었으나 지하 승강장에 체류하는 시간이 길어짐에 따라 하나의 생활 공간으로 환경개선이라는 문제에 직면하게 되었다. 이에 따라 스크린 도어의 근간이 되는 슬라이딩 자동문은 고객의 편의와 출입을 통제하는 방법의 편리성을 이유로 대형 유통매장, 병원, 음식점, 관공서 등에 광범위하게 사용되고 있다. 이에 따라 스크린 도어는 승객의 편의와 안전 확보, 쾌적한 역사 조성 및 에너지 절약을 목적으로 필요할 뿐만 아니라, 요소부품의 설계 및 신뢰성 확보를 통한 스크린 도어 시스템 최적설계기술개발이 필요하게 되었다. 따라서 본 논문에서는 지하철 안전에 필요한 스크린 도어의 모터에 대한 설계 구동 강성을 검증하기 위해 구성 부품의 이론적 하중을 계산하고 해석 하였으며, 실험을 통해 검증하였다. The initial urban railway was only required to perform its role as means of transportation. As the time of staying in an underground platform was extended, it has been faced with the issues of environmental improvement as a living space. Therefore, the sliding automatic door, which is the basis of the screen door, is used widely for large distribution stores, hospitals, restaurants, and public offices for customers' convenience and as a convenient method to control access. Therefore, screen doors are required for the purpose of customers' convenience, securing safety, establishing pleasant station buildings, and energy savings. It would be also necessary to develop the optimal design technology for a screen door system through the design of element parts and to ensure reliability. Therefore, this paper calculated, interpreted, and verified the theoretical weight of the composition parts to verify the design drive hardness of the motor for screen doors necessary for the safety of subways.
이중현(Jung-Hyun Lee),유영준(Young-Jun You),고택현(Taek-Hyun Ko),김주현(Ju-Hyun Kim),강문봉(Moon-Bong Kang),이동욱(Dong-Wook Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
Automobile manufacturers have to guarantee consistently the high accuracy of side-view camera tolerance for driver’s safety. Accordingly, they usually estimate the parameters of a lens and image sensor of an camera, which is called the camera calibration. However, calibration equipment is quite expensive and costs a lot to maintain. We present a self-calibration method that only requires a static object in the scene. Difference between each pixel in each captured frame holds clues to detect a static object. Then, we estimate camera parameters using Hough transform and normalized cross correlation algorithms. Proposed technique can overcome space constraints and is suitable for mass-production.
태권도 옆차기 동작의 동력학해석과 충격해석에 관한 연구
이중현(Jung-Hyun Lee),한규현(Kyu-Hyun Han),이영신(Young-Shin Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Taekwondo is a martial art form and sport that that uses the hands and foot for attack and defense. Taekwondo basic motion is composed of the breaking, competition and poomsea motion. In the side kick among the competition motion, the impact force is larger than other kinds of kicks. The side kick with the front foot can be made in two steps. In first step, the front foot is extended forward from back stance free-fighting position. For second step, the rear foot is followed simultaneously. Then, the kick is executed while entire body weight rests on the rear foot. In this paper, impact analysis of the human model for hitting posture is carried out. The ADAMS/LifeMOD is used in hitting modeling and simulation. The simulation model creates the human model to hit the opponent. As the results, the dynamic analysis and reaction force of human muscle are presented.
Orthotics 착용에 따른 정상, 요족, 평발의 생체역학적 보행분석 및 시뮬레이션
이중현(Jung-Hyun Lee),이영신(Young-Shin Lee),이재옥(Jae-Ok Lee),박성하(Soung-Ha Park) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.11
The foot plays an important role in supporting the body and keeping body balance. An abnormal walking habit breaks the balance of the human body as well as the function of the foot. The foot orthotics which is designed to consider biomechanics effectively distributes the load of the human body on the sole of the foot. In this paper, gait analysis was performed for three male subjects wearing the orthotics. In this study, three male subjects were selected. The experimental apparatus consists of a plantar pressure analysis system and digital EMG system. The gait characteristics are simulated by ADAMS/LifeMOD. The COP (Center of Pressure), EMG and ground reaction force were investigated. As a result of gait analysis, the path of COP was improved and muscle activities were decreased with orthotics on the abnormal walking subjects.