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Assessment of Stresses at the Lower Extremity Joints Wearing Laterally Wedged Insoles
박상백,심제연,윤정로,채수원 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
Laterally wedged insoles are known to be effective both in slowing the progression of knee osteoarthritis (OA) and in reducing pain at knee. Various research efforts have been made to investigate the effect of laterally wedged insoles on knee OA. However, most of the research works involved are either survey based or experimental, involving measuring knee alignments for the patients. In order to evaluate the effect of laterally wedged insoles more accurately, the internal stress distributions at the soft tissues of knee and ankle need to be known. A few works employ the finite element method to analyze the stress distribution at knee under a standing position but not for whole gait motion. In this study, the internal stress distributions at the soft tissues of knee and ankle during walking motion have been analyzed by employing an approach that integrate the finite element method with motion analysis. In this approach, the postures of finite element model are adjusted according to each phase of gait motion and the muscle forces obtained from motion analysis were applied as loading conditions to this FE model. Through this process, the effects of laterally wedged insoles on the lower extremity joints could be investigated by comparing the analysis results of normal gaits and gaits with laterally wedged insoles.
인진청간탕(茵蔯淸肝湯)이 DMN 유발 간섬유화와 단백질 발현에 미치는 영향
박상백,김영철,이장훈,우홍정,Park, Sang-Baek,Kim, Young-Chul,Lee, Jang-Hoon,Woo, Hong-Jung 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.1
Objectives : The purpose of this study was to investigate the effects of Injinchunggan-tang (Yinchenchinggan-tang) on DMN-induced liver damage by applying proteomics. Materials and Methods : Sprague-Dawley rats were used in this experiment and were divided into the normal group (normal saline), the control group (DMN) and the sample group (DMN+IJCGT). DMN was injected i.p. once a day three times a week for 3 weeks in the control group. Normal saline instead of DMN was administered to the normal group. In the sample group, Injinchunggan-tang (Yinchenchinggan-tang) extract was orally administered once a day for 10 days after DMN was induced. The livers of each group were processed and analyzed by histology, Western blot, $Oxyblot^{TM}$, CBB and 2-dimensional electrophoresis. Results : In the histological findings of the liver, IJCGT reduced collagen deposition and liver damage in DMN-induced hepatic fibrosis. IJCGT increased MMP-13 protein production assessed by western blot. Protein oxidation induced by DMN treatment was decreased by IJCGT. In the 2-dimensional electrophoresis finding, the level of the increased proteins induced by DMN treatment such as GRP 75, 58kDa glucose regulated protein and heat shock 70kDa protein 5 were decreased by IJCGT. IJCGT was considered to have the protective effects on hepatotoxicity induced by DMN. In the 2-dimensional electrophoresis finding, the level of increased oxidized proteins such as heat shock 70 protein, mitochondrial malonyltransferase, calreticulin precursor, actin, NADP-isocitrate dehydrogenase, ankyrin repeat and SOCS box protein 11 were decreased by IJCGT. IJCGT was considered to have protective effect on the protein production induced by DMN treatment. Conclusion : Injinchunggan-tang (Yinchenchinggan-tang) exerts an inhibitory effect against the fibrosis and protein oxidation induced by DMN treatment in the rat liver. IJCGT was considered to have protective effects on the hepatotoxicity and protein production induced by DMN treatment.
Finite Element Modeling to Estimate the Apparent Material Properties of Trabecular Bone
박상백,채수원,박정수,한승호,홍정화,김영은 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.8
The in-vivo micro-structure and corresponding material property of trabecular bone is important to simulate the mechanical behavior of macroscopic bone structure. In order to simulate the mechanical behavior of bone numerically, the apparent Young’s modulus of trabecular bone should be available. Generally a high-resolution finite-element model based on micro-CT-images could be was used to estimate this value. However, all the previous works regarding this issue have employed either eight-noded voxel elements or fournoded tetrahedral elements, which usually produces large amount of error in estimating an apparent material property. Therefore,rigorous studies on the accuracy of element type for predicting the material properties of cancellous bone have been made in this paper. Micro-CT-data were extracted from a femoral neck to construct three-dimensional finite-element models with three different element types and compression analyses were performed numerically (up to 1.3% strain) to estimate the apparent modulus. Compression tests using the specimens extracted from a cadaver were also performed to validate the simulated apparent material properties using different element types. As a result, ten-noded tetrahedral elements are recommended to obtain reliable material properties of cancellous bone instead of eight-noded voxel elements or four-noded tetrahedral elements.
박상백(Sangbaek Park) 한국세라믹학회 2022 세라미스트 Vol.25 No.1
All-solid-state batteries are attractive energy storage devices with high stability and energy density due to their non-flammable solid electrolytes that can utilize lithium and allow cells to be stacked directly in series. It is essential to develop superior solid interfaces for its commercialization by improving the interfacial stability and kinetics. However, complex interfacial phenomena in both solid electrolyte/cathode and solid electrolyte/ anode make the interfacial problem of all-solid-state batteries difficult to solve. To overcome this issue, the origins of high resistance and low stability at solid interfaces have been widely explored and alternatives have been proposed accordingly. In this paper, the main methodologies and recent advances for solving the solid electrolyte/electrode interface problems will be reviewed in the chemical, electrochemical, and mechanical aspects.