• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.1159-1160
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.10a
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• pp.907-908
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.891-892
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1421-1422
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• 2011

• 전기의세계
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• v.45 no.8
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• pp.25-29
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• 1996

동맥에 대한 기계 역학적인 연구역사는 30년에 이르고 있다. 그 연구 성과로 말미암아 동맥의 물성 파악, 동맥의 인조화, 동맥의 의학적인 시술에 대한 공학적인 평가 분석 및 제안, 동맥의 생리학적인 현상에 대한 이해 보강, 병리 현상의 공학적인 분석 및 예고, 공학적인 현상과 조직학적인 현상에 대한 연관성 파악 및 응용등, 많은 공헌을 하고 있다. 동맥에 대한 공학적인 연구학문을 동맥역학(Arterial Mechanics)이라 한다. 동맥역학의 궁극적 분석겨로가는 동맥에 대한 물성과 혈압으로 인한 변형율과 응력에 관한 것이다. 동맥의 물성 파악은 혈류와 Mass Transport의 효과로 인한 동맥의 질병양태에 대한 해석을 돕고 있다. 또한 동맥의 병리현상과 생리현상을 이해하는 데에 변형율과 응력 분포도가 중요한 요소로 역할을 하고 있다. 동맥의 연구 방법론적 고찰의 내용은 실험이나 데이터 분석방법이 비슷하기 때문에 동맥 외의 인체의 soft tissue(피부, 심장, 근육, 눈등)에 대한 연구고찰이라고도 할 수 있다. 본 논문은 현재까지 진행된 주요한 연구를 고찰하고 동맥 역학에 대한 관심과 인식을 고취시키는 데에 그 목적이 있다.

• Journal of Biomedical Engineering Research
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• v.24 no.4
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• pp.329-337
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• 2003

Blood in congenital or acquired AY fistula(arteriovenous fistula) flows from arteries directly to veins. detouring peripheral micro-circulation. This makes a great effect on the hemodynamics of human cardiovascular system. In this study, a computational method using lumped parameter mode) was proposed to simulate the cardiovascular hemodynamics of patients with acute AV fistula The cardiovascular system model with a fistula compartment in left lower limb was built using 17 standard lumped compartments. Using fourth order Runge-Kutta method. we solved numerically the unsteady linear set of the ordinary differential equations resulting from application of Kirchhoff's law to the lumped parameter hemodynamic model. The baroreceptor reflex system was implemented to explain the auto-regulation effect of the cardiovascular system with acute AV fistula.

• Journal of the Korea Society of Computer and Information
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• v.19 no.3
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• pp.155-161
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• 2014

The objective of this study is to weight analysis portable backpack system of infantry weapon systems for ergonomic design in manual materials handling tasks. For the product design, we analyzed the ergonomic guidelines and status of similar weapon systems by comparing the efficient operation performance provide for the basic data. Result of this study, the relationship between portability and mobility presented for schematic. In the short distance of the short biomechanical criterion, 1-2 hours in the middle of moving psychophysical criterion, 4 hour or more long-distance criterion applied for the physiological criterion for easy of trade-offs that need to be considered. This study suggests for 4 research items for infantry backpack system in manual materials handling tasks. Throughout the result of anthropometric populations, the 5%tile body weight for -0.91kg but 95%tile in 34.17kg considered to be margin for free, easy and efficient operation for the weight margin between portability and mobility in manual materials handling tasks.

• Journal of Biomedical Engineering Research
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• v.19 no.4
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• pp.423-429
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• 1998

Human pharynx is unique, acting as a complex interchange between the oral cavity and esophagus, and between the nasal cavity and lungs. It is actively involved in the transport of food and liquid, producing the forces that guide that bolus into the upper esophagus and away from the adjacent larynx and lungs. This study intended to develop a biomechanical model of the human pharynx, utilizing Finite Element Method(FEM). Within each model changes in cross sectional intralumenal area were calculated and compared with the area from the computer-generated FE model. Area matching allowed estimation of intraluminal pressure gradients during swallow. The estimated pharyngeal pressure gradient varies from one region to another. The estimated pharyngeal pressure gradients showed different patterns for upper four levels and lower four levels. The contraction velocity for upper four levels is much higher than lower four levels. The higher contraction velocities and pressure gradients in the upper levels are consistent with the bolus velocities required for efficient swallow.

• Korean Journal of Applied Biomechanics
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• v.19 no.3
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• pp.567-580
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• 2009

The purpose of this study was to find out how the combined exercise program has an influence on the physical recovery of the patients suffering from work-related back problems. Research objects consist of 43 patients suffering from back problems due to workplace accidents. The result of the study shows that the combined exercise program increased muscular strength and endurance significantly and worked positively in lumbar recovery of the patients. It also increased the lowered flexibility caused by back pain to the level of normal state. In addition, the program was effective on the correction of the bad pose of body and scoliosis. Moreover, it helped improve on lifting, social life and reduce in the duration and the frequency of outbreak of pain. Finally, according to the result of this study, the combined exercise program was shown to be effective and appropriate for the patients suffering from work-related back problems.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.7 no.1
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• pp.21-27
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• 2013

Manual wheelchair propulsion can lead to pain and injuries of users due to mechanical inefficiency of wheelchair propulsion motion. The kinetic analysis of the upper limbs during manual wheelchair propulsion needs to be studied. A two dimensional inverse dynamic model of upper limbs was developed to compute the joint torque during manual wheelchair propulsion. The model was composed of three segments corresponding to upper arm, lower arm and hand. These segments connected in series by revolute joints constitute open chain mechanism in sagittal plane. The inverse dynamic method is based on Newton-Euler formalism. The model was applied to data collected in experiments. Kinematic data of upper limbs during wheelchair propulsion were obtained from three dimensional trajectories of markers collected by a motion capture system. Kinetic data as external forces applied on the hand were obtained from a dynamometer. The joint rotation angles and joint torques were computed using the inverse dynamic model. The developed model is for upper limbs biomechanics and can easily be extended to three dimensional dynamic model.