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Analysis of Contact Pressure at Knee Cartilage during Gait with Respect to Foot Progression Angle
Yoon, Jeongro,Ha, Sungpil,Lee, Seungju,Chae, Soo-Won Korean Society for Precision Engineering 2018 International Journal of Precision Engineering and Vol.19 No.5
One of the main causes that make knee osteoarthritis (OA) worse is load concentration at the medial compartment of knee cartilage. It is alternatively measured by employing knee adduction moment (KAM). Since toe-in gait decreases the 1st peak of KAM, it has been considered as a non-surgical prevention of OA progressing. However, direct measures such as contact pressure at knee cartilage in motion have not been available so far. Obtaining contact pressure at knee cartilage by FE analysis is difficult because exact muscle forces are not available and because FE model should be reconstructed at every stance phase. To obtain contact pressure at knee cartilage during gait, a method employing FE analysis based on motion analysis has been used in this study. Reference FE model of lower extremities was constructed and transformed to specific stance phases of gait. Ground reaction forces and muscle forces from motion analysis were employed as loading conditions. Finally, contact pressure distributions on knee cartilage at 1st peak, mid stance, 2nd peak could be obtained with respect to foot progression angle. The result shows that toe-in gait could be effective for knee OA patients by dispersing contact pressure concentrated in medial knee compartment to lateral part.
윤자걸 ( Yoon Jah-geol ),김정인 ( Kim Jungln ),장승필 ( Chang Sungpil ),문종훈 ( Moon Jonghoon ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
In this paper, the simulation of damage assessment on a cable-supported bridge has been conducted by using artificial neural networks (ANN). The simulation was performed to prepare the experiment on a real bridge, and it is not recommendable to cause artificial damages to object structures in service stage. Therefore additional masses were put on the structure instead, and ANN was used to detect these additional masses. A few training scenarios were composed to find the most appropriate one and the sensitivity of detection to noises was also analyzed.
윤자걸(Yoon Jah-Geol),김정인(Kim JungIn),장승필(Chang SungPil),문종훈(Moon JongHoon) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In this paper, the simulation of damage assessment on a cable-supported bridge has been conducted by using artificial neural networks(ANN). The simulation was performed to prepare the experiment on a real bridge, and it is not recommendable to cause artificial damages to object structures in service stage. Therefore additional masses were put on the structure instead, and ANN was used to detect these additional masses. A few training scenarios were composed to find the most appropriate one and the sensitivity of detection to noises was also analyzed.
정성필(Sungpil Jung),전갑진(Kabjin Jun),이수호(Suho Lee),우준성(Junseong Woo),박태원(Taewon Park),윤재호(Jaeho Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very difficult to estimate the braking performance of a vehicle because brake system includes many parts such as a booster, a master cylinder, a valve and so forth. To calculate the braking characteristics such as braking force through the real vehicle test requires much time and cost. Therefore, the development of the way to estimate the braking performance of a vehicle with computational methods is needed. In this paper, a program which can analyze the whole braking capabilities of a vehicle is presented. Since all input and output data are composed of the Microsoft Excel format, it is easy to manage design data and found the data base. It is considered that the braking characteristics against the variation of booster vacuum pressure are changed when a vehicle is under braking. Furthermore, the additional postprocessor not only makes the graph presentation of the result data but also generates the Excel result files for the report.
Purification and Characterization of Protein Carboxyl O-Methyltransferase from Porcine Spleen
Hong,Sungyoul,Yoon,Sungpil,Son,Minsik,Han,Jeung-Whan,Lee,Hyang Woo The Korea Science and Technology Center 1997 BMB Reports Vol.30 No.6
We purified a protein carboxyl O-methyltransferase (protein methylase Ⅱ) from porcine spleen to homogeneity. The molecular weight of the porcine spleen protein methylase Ⅱ (ps-PM Ⅱ) was estimated to be 27,500 daltons on SDS-PAGE. Amino acid sequence of N-terminal 28 residues for ps-PM Ⅱ was identified. Amino-terminal three amino acid residues of ps-PM Ⅱ were deleted when compared to those of other protein carboxyl methytransferase. S-Adenosyl-L-homocysteine competitively inhibits ps-PM Ⅱ with a K? value of 1.63×10? M. Myelin basic protein exhibited the highest methyl-accepting capacity among the proteins tested.
실험계획법에 의한 휴머노이드 발의 민감도 해석 및 최적화
윤지원(Jiwon Yoon),박태원(Taewon Park),정성필(Sungpil Jung),박중경(Joongkyung Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
These days, up-to-date humanoid robots are continuously developed. Among them, Qrio, Asimo[1,2] are famous for its unique walking technology and natural movement. These robots could show manufacturers' technological improvement and leave a good impression to the customer. In accordance with global trends, Samsung is also producing humanoid robot. The humanoid robot, however, could walk like a human compared to the industrial robot fixed in the factory. This feature could cause another dynamic effect while walking. In this paper, the robot's feet were examined to find out parameters that affect stability of the humanoid robot's feet. With the sensitivity analysis, the optimization procedure in design of experiments finds the most suitable performance of robot. Maximum deflection of the frame upon various cases was minimized, and rubber coefficients for shock absorption were optimized.
객체 지향 알고리즘을 이용한 탄성 다물체계의 체계적인 해석
윤지원(Jiwon Yoon),박태원(Taewon Park),정성필(Sungpil Jung),이수호(Sooho Lee),전갑진(Kabjin Jun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Recent developments in multibody dynamics are mostly related to the flexible multibody dynamics and researches considering structural dynamics. In this paper, using the object-oriented programming language, C, a flexible multibody analysis program is developed. The developed program is easy to attach and rebuild new module program and sub-routine due to its nature; data abstraction, inheritance, and polymorphism. Furthermore, developed dynamic solver is composed of three kinds of coordinate system, which are absolute cartesian and orientation coordinates, modal coordinates and absolute nodal coordinates; so that these mixed coordinate systems enables to solve various kinds of system including rigid, flexible and very flexible multibody system. This program could provide the theoretical background and basic foundation to solve various systems and predict their behavior.
Development of R packages: ‘NonCompart’ and ‘ncar’ for noncompartmental analysis (NCA)
Hyungsub Kim,Sungpil Han,조용순,Seok-Kyu Yoon,Kyun-Seop Bae 대한임상약리학회 2018 Translational and Clinical Pharmacology Vol.26 No.1
Noncompartmental analysis (NCA) is a primary analytical approach for pharmacokinetic studies,and its parameters act as decision criteria in bioequivalent studies. Currently, NCA is usuallycarried out by commercial softwares such as WinNonlin®. In this article, we introduce our newlydevelopedtwo R packages, NonCompart (NonCompartmental analysis for pharmacokinetic data)and ncar (NonCompartmental Analysis for pharmacokinetic Report), which can perform NCAand produce complete NCA reports in both pdf and rtf formats. These packages are compatiblewith CDISC (Clinical Data Interchange Standards Consortium) standard as well. We demonstratehow the results of WinNonlin® are reproduced and how NCA reports can be obtained. With these Rpackages, we aimed to help researchers carry out NCA and utilize the output for early stages of drugdevelopment process. These R packages are freely available for download from the CRAN repository.