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김현철(H. C. Kim),조현석(H. S. Cho),송점식(J. S. Song),장윤희(Y. H. Jang),신현준(H. Shin),이종항(J. H. Lee) 한국재활복지공학회 2021 재활복지공학회논문지 Vol.15 No.1
현재 대다수의 하지절단자들이 사용하는 에너지 저장형 인공발은 체중을 이용하여 인공발 구조재의 변형으로부터 얻어진 에너지를 입각기 말기에 보행 추진력으로 활용하여 장시간 보행 시 신체의 에너지 소모를 줄이는 목적을 가진다. 하퇴절단자의 경우 이러한 탄성 에너지를 활용함과 동시에 자연스러운 동작으로 보행이 가능하지만, 대부분의 대퇴절단자의 경우 기계식 슬관절장치를 사용하기 때문에 입각기 동안 슬관절을 완전 신전 상태로 보행함에 따라 탄성 에너지의 활용성도 떨어지고 보행 모습도 부자연스럽다. 본 연구에서는 인체의 해부학적 신체 구조와 유사하게 중족지관절과 발목관절 요소를 구현하여 발구름 특성을 개선하고 지면적응력을 높임으로써 대퇴절단자의 보행능력을 향상시키기 위한 목적의 인공발을 개발하였다. 개발된 인공발은 양측 하퇴절단자 3명, 편측 대퇴절단자 3명을 대상으로 2주간의 일상생활 환경에서의 사용성 평가를 수행하였다. 개발된 인공발을 2주간 착용한 후, 본인 소유의 기존 인공발과 개발된 인공발에 대하여 총 12문항의 설문을 통한 주관적 만족도를 조사하였다. 양하퇴절단자 및 대퇴절단자군 모두 개발된 인공발의 만족도가 더 높게 나타났으며, 특히 울퉁불퉁한 험지나 계단, 경사로 보행에서 좀 더 높은 만족도를 보이는 것으로 나타났다. The characteristic of conventional energy storage artificial feet is that they are designed to minimize the energy consumption of the body even when walking for a long time by utilizing the energy obtained from deformation of foot structures by their weight for the walking propulsion. In the case of below-knee amputee, the elastic energy can be utilized well and it is possible to achieve a natural motion. But in the case of above knee amputee, the elastic energy is not fully used and they can’t walk naturally because they walk with fully extended knee during stance phase due to the passive mechanism of the knee prostheses most of them using. In this paper, we developed the prosthetic foot with metatarsophalangeal joint and ankle joint simulating anatomical body structures for the purpose of improving the roll-over characteristics and the terrain adaptabilities which leads the above-knee amputees’ walking ability. We evaluated the usability of the developed foot by the 2 weeks of ADL tests of 3 bilateral transtibial amputees and 3 unilateral transfemoral amputees. The questionaries with 12 items were performed after using the developed feet during 2 weeks. The individual satisfaction about the developed and their own feet were investigated. Both of transfemoral and transtibial amputees satisfied more with the developed foot in most of questions and much more with it in the stair, uneven terrain, slope environments specially.
이석우(S.W. Lee),최헌종(H. Z. Choi),허남환(N. H. Heo),이종항(J. H. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Recently, environmental pollution has become a serious problem in industry, and many researches<br/> have been done in order to preserve the environment. The coolant, which promotes lubrication, cooling<br/> and penetration, contains chlorine, sulfur and phosphorus to improve the machining efficiency. These<br/> additives, which move around into the air during machining, pollute working. Therefore, many<br/> researches on how to reduce the amount of coolant during machining have been carried out. However,<br/> to reduce even small amount of coolant causes high temperature of a workpiece and it brings thermal<br/> defects.<br/> In this study, the experiments of wet & dry grinding using cooling methods (using coolant only,<br/> mist and compressed cold air only) are performed to solve the problem of environmental contamination<br/> and to get a better surface integrity of a workpiece by comparing surface roughness, roundness and<br/> residual stress.
곽승용(S. Y. Kwak. J. H. Lee),이종항(D. G. Kim),김동길. 이상조(S. J. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The coolant for cutting process contains several chemicals-sulfur, phosphorus and chlorine etc. to improve the cutting efficiency. But such chemicals generate cancerogenic substances when it is incinerated. So it degenerate the working environment, which is harmful to workers and also causes environmental pollution. In this study compressed cold air was used as a replacement for conventional cutting fluids. The maximum flow rate and the minimum temperature of compressed cold air are respectively 300l/min and -30℃ in this study. To compare cooling effects of compressed cold air and coolant, cutting temperature was measured. To measure the cutting temperature, the thermocouple was embedded in the carbide insert and the temperature was compared when various cooling conditions was applied.