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기능성 발보조기 착용 전후의 시상면의 편평족 발목각도 변화에 관한 연구
박광용,박승환,Park, K.Y.,Park, S.H. 대한의용생체공학회 2010 의공학회지 Vol.31 No.1
The foot performs an important function in supporting the body and keeping body balance. An abnormal walking habit breaks the balance of the human body as well as the normal function of the foot. The influence of a flatfoot(pes planus) occupies a considerable portion of the various causes resulting in the wrong walking habit. But, little studies has been done by the functional foot orthotics for the flat foot. The object of this study, therefore, is to propose a new approach method to reveal the effects of the improvement of the foot function by using orthotics. The essential point of this study is to measure and analyze the change of ankle angle in the sagittal plane for flat foot subjects wearing the orthotics. Before and after wearing the functional orthotics, the gait analysis of flat foot subjects was conducted in three experimental aspects : the change of ankle angle, the change of the total Ankle ROM and the difference of left & right ankle angle in the sagittal plane. 1. The average ankle angle differences of before-and-after wearing the orthotics have declined like this; left : $2.71^{\circ}$, right: $1.91^{\circ}$ (p<0.05). 2. Total ankle ROM also showed decrease in both sides while the left side's is rather slight; left : $0.57^{\circ}$, right : $2.07^{\circ}$ (p<0.05). 3. The difference of left and right ankle angle in the sagittal plane decreased by $0.71^{\circ}$ (p<0.05). In result, it is confirmed that the functional foot orthotics have a significant effect on mechanical movement of ankle joint for flat foot. it is expected that this paper will be further studied and improved as a practical estimation method in the research on the effect of foot-orthotics.
구 대칭형 양자점 코어/쉘에 대한 횡등방성체의 압전탄성 해
서소영(S. Y. Seo),유성식(S. S.Yoo),박승환(S. H. Park),박유근(Y. E. Pak) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Piezoelectric behavior of quantum dot core/shell structures in zinc-blende and wurtzite crystals are investigated in the framework of linear piezoelectricity. Since the core and the shell are often made from different materials with different lattice dimensions, the assembled QD core/shell structures can induce misfit strains. Thus, strains arising from lattice mismatch in the core/shell structure are modeled as eigenstrains resulting from size-mismatched inclusion embedded in a finite spherical piezoelectric medium. FEA for the case of rectilinear anisotropy was also performed since the obtained solution is spherical anisotropy which is tractable mathematically. The FEA showed considerable difference from the spherically anisotropic analytical solution. The obtained solutions, herein, can be used for any two-layer piezoelectric structures having spherical geometry subjected to various electromechanical loads.
네트워크를 이용한 자동 Ⅳ 주사 유량 제어 및 모니터링
김진남(J. N. Kim),권원태(W. T. Kwon),김용선(Y. S. Kim),김종혁(J. H. Kim),리춘미(C. M. Lee),이성규(S. K. Lee),박승환(S. H. Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Ⅳ injection is the giving of substances directly into a vein and is widely used in hospitals. This passive method does not control the flow rate consistently. As a result, it causes an unnecessary nurse's overwork and decrement of Ⅳ injection's effect. To solve these problems, the flow control infusion pump has been developed. But because of relatively heavy weight and high price, it has not been used widely, yet. In this study, automatic Ⅳ injection system with small pressing mechanism and efficient control system is designed and fabricated. The system is smaller in size and uses lower power than the existing commercial product. Presented system is also equipped with networking capability, which enables monitoring the status of several automatic IV injection system.