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고명준(Myung-Jun Ko),V. Patrangenaru(Vlad Patrangenaru),홍성욱(Seong-Wook Hong),이득우(Deug-Woo Lee) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
This paper introduces a couple of surface matching algorithms that can be used to reconstruct the surface topography of an object scanned of by an AFM. These image matching techniques are applied to two neighboring images intentionally overlapped with each other. To enhance the performance, this paper compare two algorithms using the correlation coefficient and the sum of the squared differences. To compensate for the inaccuracy of the coarse stage implemented to AFM, all the six axes including the rotational degrees of freedom are successively matched to maximize the coefficient defined. The results show that the proposed algorithms are useful for measurement range extension of AFM. The results also show that a combined use of the two indices is beneficial for practical cases.
A Method for Identifying Human-generated Forces during an Extensor Thrust
Seong-Wook Hong,Vlad Patrangenaru,William Singhose,Stephen Sprigle 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.3
Some wheelchair users with neuromuscular disorders experience involuntary extensor thrusts, which may cause injuries via impact with the wheelchair, cause the user to slide out of the wheelchair seat, and damage the wheelchair. Knowledge of the human-generated forces during an extensor thrust is of great importance in devising safer more comfortable wheelchairs. This paper presents an efficient method for identifying human-generated forces during an extensor thrust. We used an inverse dynamic approach with a three-link human body model and a system for measuring human body motion. We developed an experimental system that determines the angular motion of each human body segment and the force at the footrest, which was used to overcome the mathematical indeterminacy of the problem. The proposed method was validated experimentally illustrating the force-identification process during an extensor thrust.
A Method for Identifying Human-generated Forces during an Extensor Thrust
Hong Seong-Wook,Patrangenaru Vlad,Singhose William,Sprigle Stephen Korean Society for Precision Engineering 2006 International Journal of Precision Engineering and Vol.7 No.3
Some wheelchair users with neuromuscular disorders experience involuntary extensor thrusts, which may cause injuries via impact with the wheelchair, cause the user to slide out of the wheelchair seat, and damage the wheelchair. Knowledge of the human-generated forces during an extensor thrust is of great importance in devising safer, more comfortable wheelchairs. This paper presents an efficient method for identifying human-generated forces during an extensor thrust. We used an inverse dynamic approach with a three-link human body model and a system for measuring human body motion. We developed an experimental system that determines the angular motion of each human body segment and the force at the footrest, which was used to overcome the mathematical indeterminacy of the problem. The proposed method was validated experimentally, illustrating the force-identification process during an extensor thrust.
원자간력 현미경의 측정면적 확대를 위한 영상정합 알고리즘 개발
고명준(M. J. Ko),V. Patrangenaru,홍성욱(S. W. Hong) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
This paper introduces a correlation-based surface matching algorithm that can be used to reconstruct the surface topography of an object that is scanned from multiple overlapping regions by an AFM. The image matching technique is applied to two neighboring images intentionally overlapped with each other. To account for the inaccuracy of the coarse stage implemented in AFM, all the six axes including the rotational degrees of freedom are successively matched to maximize the correlation coefficient. The results show that the proposed 6-axes image matching method is useful for expanding the measurement range of AFM.