http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Design and Analysis of Decoupled Parallel Mechanism with Redundant Actuator
김선호,김선호,전동수,신현표,인우성,김종원 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
This paper presents a redundantly actuated six degrees-of-freedom parallel kinematic mechanism with a partially decoupled architecture in its rotational motion. This mechanism is developed to eliminate kinematic complexity of original Eclipse-II known as a redundant parallel mechanism. Since the original Eclipse-II mechanism use kinematic redundancy of parallel mechanism to achieve an advantage in enlarging the workspace of the system, it needs a motion planning algorithm to choose the specific control inputs to determine the desired motion trajectory. This motion planning algorithm causes difficulty in achieving real-time control performance due to its structural complexity. However the redundant parallel mechanism presented in this paper is a redundant parallel mechanism with partially decoupled architecture in its rotational motion. Therefore modified Eclipse-II redundant parallel mechanism can realize effective real-time control performances and continuous 360-degree rotational motion in any direction of the moving platform with six degrees of freedom.
김선호,윤지호,김진용,안종환 대한산업공학회 2007 산업공학 Vol.20 No.2
The national product identifier(NPI) currently used in the national product asset management system does not accommodate ISO or EPC standards due to the limitation of tag memory. For this reason, we propose a new NPI which accommodates not only ISO item identification standards but also the memory capacity of ISO tags. First of all, memory structures of ISO/IEC 18000-6C and EPC tags are analyzed from the view point of product identifier structure. Second, ISO/IEC 15459 and EPC identification standards as item identifier structures for the product asset management are analyzed. Third, based on these analyses, the NPI used for the current RFID-based product asset management system is analyzed and its problems are presented. Finally, a new NPI structure is proposed suitable for ISO/IEC 18000-6C and ISO/IEC 15459.
김선호 대한영상의학회 1997 대한영상의학회지 Vol.37 No.2
Purpose : To determine the differential points of hard palate masses, using CT and MRMaterials and Methods : MR (N=18) and CT (N=15) findings in 30 patients with pathologically- proven hard palate masses were reviewed. Masses originating in minor salivary glands were the most common (66.7%, N=20), and the remainder were accounted for by squamous cell carcinoma (N=5), lymphoma (N=2), malignant schwannoma (N=1), neurofibroma (N=1), and cholesterol granuloma (N=1). Location and demarcation of the lesions, MR signal intensity, degree of enhancement, internal architecture, and the patterns of adjacent tissue plane invasion were analyzed.Results : The location of lesions originating in minor salivary glauds was as follows : paramedial, 73.7% (14/19); midline, 85.7% (6/7); and marginal, 0%(0/4). On MR imaging, signal intensity and degree of enhancement showed no significant differential point except lower, T2 signal intensity (3/5) and less enhancement (4/5) in squamous cell carcinoma than in other masses. Necrosis was seen in 10/21 malignant masses (47.6%), poor demarcation in 10/21 (47.6%), bone invasion in 19/21 (90.5%), and tissue plane invasion in 15/21(71.4%); in benign masses, the corresponding figures were 4/9 (44.4%), 1/9(11.1%), 2/9 (22.2%), and 3/9 (33.3%). Two of 21 malignant masses (9.5%) showed none of the above charachteristics. Conclusion : Centrally located lesions most probably originate in minor salivary glands. In the hard palate, benign masses can show features which are generally thought to be those of malignant tumors, whereas malignant tumors can be free of such features; in differential diagnosis, caution is therefore required.