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주성분 요소분석방법을 이용한 거실에서의 노인 움직임 - 영상감시를 위한 알고리즘 연구 -
서덕찬,유선국,최귀원,김동근,김정채 대한의료정보학회 2007 Healthcare Informatics Research Vol.13 No.3
Objective: Development of telemedicine for an elder has been an important research area in an aging society, and effective Personal Emergency Response System(PERS) can provide exact medical decision and prompt treatment under emergency conditions. Previous studies have been focused on adapting troublesome sensors or passive calling system to monitor the old in their house. However, these previous systems might have limited applications due to its difficulties in usage and restraints in their daily activities, especially in the emergency. Methods: In this study, the real time algorithms using surveillance camera was developed to monitor their pose change, such as emergency and falling motion. To estimate the motion of elder people, this research use a ratio of eigenvectors of the Principal Component Analysis (PCA) technique. Results: In this system, no additional motion sensors or devices were applied to the object and it can be automatically controlled and monitor the old from a distance. It was found that this system can successfully monitor the old in living room regardless of surveillance camera angles and a silhouette size depending camera distance as using image processing and PCA. Conclusion: This algorithm was validated by experiments in a living room and this technique can be applicable to home monitoring and further applications. (Journal of Korean Society of Medical Informatics 13-3, 299-308, 2007)
기재홍,서덕찬,박흥석,윤인찬,이문규,유선국,최귀원,Key, J.H.,Seo, D.C.,Park, H.S.,Youn, I.C.,Lee, M.K.,Yoo, S.K.,Choi, K.W. 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
Image Guided Surgery (IGS) system which has variously tried in medical engineering fields is able to give a surgeon objective information of operation process like decision making and surgical planning. This information is displayed through 3D images which are acquired from image modalities like CT and MRI for pre-operation. The technique of image registration is necessary to construct IGS system. Image registration means that 3D model and the object operated by a surgeon are matched on the common frame. Major techniques of registration in IGS system have been used by recognizing fiducial markers placed on the object. However, this method has been criticized due to additional trauma, its invasive protocol inserting fiducial markers in patient's bone and generating noise data when 2D slice images are acquired by image modality because many markers are made of metal. Therefore, this paper developed shape-based registration technique to improve the limitation of fiducial marker based IGS system. Iterative Closest Points (ICP) algorithm was used to match corresponding points and quaternion based rotation and translation transformation using closed form solution applied to find the optimized cost function of transformation. we assumed that this algorithm were used in Total Knee replacement (TKR) operation. Accordingly, we have developed region-based 3D registration technique based on anatomical landmarks and this registration algorithm was evaluated in a femur model. It was found that region-based algorithm can improve the accuracy in 3D registration.
Cement Type 맞춤형 인공고관절의 설계 변수 변화에 따른 Cement 두께 변화와 이에 대한 응력 분석
박흥석,전흥재,윤인찬,이문규,서덕찬,최귀원,Park, Heung-Seok,Chun, Heoung-Jae,Youn, In-Chan,Lee, Moon-Kyu,Seo, Duck-Chan,Choi, Kui-Won 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
The choice of suitable hip implant is one of important factors in the total hip arthroplasty (THA). In clinical view point, an improper adaptation of hip implant might induce abnormal stress distribution to the bone, which can shorten the lifespan of replaced hip implant. Currently, interest in the custom-designed hip implants has increased as studies reveal the significance of geometric shape of patient's femur in modeling and designing the implants. In this study, we have developed custom-designed hip implant models with various sizes, and analyzed the stress distribution in the bone and bone cement using the Finite Element Method. It was found that minimizing the gap between implant stem and femoral cavity is crucial to minimize the stress concentration in the bone.