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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,이서정 동덕여자대학교 2002 정보과학연구 Vol.6 No.-
인터넷 사용자의 꾸준한 증가와 IP 주소의 수요 증가로 인해 현재 IPv4 기반의 주소 체계는 주소 공간 부족 문제를 비롯하여 여러 가지 측면에서 한계에 이르고 있다. 이러한 문제를 해결하기 위한 방안이 IPv6이다. 본 연구에서는 IPv6의 등장 배경, 망 구축 현황, 향후 발전 방향 등을 고찰해 봄으로써 IPv6 망 체제에 준비하며 IPv6 관련 기술 개발에 기여하고자 한다. According to the increase of internet user and demand for IP addresses, the current system of IP address based on IPv4 is faced on insufficiency of address space, security, mobility support, and so on. IPv6 is a new version of IP which is designed to solve these problems as an advanced step from IPv4. This paper has a purpose to contribute on preparing for upcoming IPv6 network system and the development of IPv6 technologies by studying the background on which the IPv6 was introduced, current network-building situation of it, and the expected change of IPv6 in the future.
김선호,Kim Sun-Ho 한국문헌정보학회 1992 한국문헌정보학회지 Vol.22 No.-
The purpose of this study is to verify the correlations between the amount of the online searcher's search experience and their search effect. In order to achieve this purpose, the 28 online searchers working at the chosen libraries and information centers have participated in the study as subjects. The subjects have been classified into the two types of cognitive style by Group Embedded Figure Test. As the result of the GEFT, two groups have been identified: the 15 Field Independance ( FI ) searchers and the 13 Field Dependance ( FD ) searchers. The subject's search experience consists of the 3 elements: disciplinary, training, and working experience. In order to get the data of these empirical elements, a questionnaire have been sent to the 28 subjects. An online searching request form prepared by a practical user was sent to all subjects, who conducted searches of the oversea databases through Dialog to retrieve what was requested. The resultant outcomes were collected and sent back to the user to evaluate relevance and pertinence of the search effect by the individual. In this study, the search effect has been divide into relevance and pertinence. The relevance has been then subdivided into the 3 elements : the number of the relevant documents, recall ratio, and the cost per a relevant document. The relevance has been subdivided into the 3 elements: the number of the pertinent documents, utility ratio, and the cost per a pertinent document. The correlations between the 3 elements of the subject's experience and the 6 elements of the search effect has been analysed in the FI and in the FD searchers separately. At the standard of the 0.01 significance level, findings and conclusions made in the study are summarised as follows : 1. There are strong correlations between the amount of training and the recall ratio, the number of the pertinent documents, and the utility ratio on the part of FI searchers. 2. There are strong correlations between the amount of working experience and the number of the relevant documents, the recall ratio on the part of FD searchers. However, there is also a significant converse correlation between the amount of working experience and the search cost per a pertinent document on the part of FD searchers. 3. The amount of working experience has stronger correlations with the number of the pertinent documents and the utility ratio on the part of FD searchers than the amount of training. 4. There is a strong correlation between the amount of training and the pertinence on both part of FI and FD searchers.
김선호,임영무 한국교원대학교 학교체육연구소 2004 학교체육연구소지 Vol.11 No.1
The purpose of this study was to find out the improving achievement and fulfillment in the co-ed physical education classes through the understanding of female students. We inquired into the gender role identity and gender consciousness to understand scho