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노인의 활동성 여가참여가 사회적 역할상실감 및 삶의 질적 가치인식에 미치는 영향
김상대(Sang Dai Kim) 한국여가레크리에이션학회 2009 한국여가레크리에이션학회지 Vol.33 No.3
This study was to verify the effectiveness of physical leisure activities, to overcome social role loss which the elderly undergo in the process of desocialization and to reconsider the recognition of life`s quality. The elderly, man and women over aged 60 who live in Busan metropolitan city in April, 2009 years, were taken as a population, and were sampled 568 substitutes by questionnaire. The results analyzing data were as follows. The physical leisure activities in the elderly had positive effects on the overcome of loss as the role of citizen and friend among social roles. The recognition of life`s quality had a positive effects on the sub-factors like emotional and physical status, function, interpersonal relation in elderly. In the matter of difference in the period of participation of leisure activities, the both roles loss of citizen and friend among social roles loss were highest in the group of under 2years, were lowest in the group of 5-8years. In the matter of recognition of life`s quality, emotional status was the lowest in the group of under 2years while was the highest in the group of between 5-8 years. Physical status and function were the highest in the group of under 2years while were the highest in the group of over 8 years. As the conclusion, the programs for physical leisure activities will be one of very effective methods to solve the aged problem, faced in Korea, by coping social role loss and resocialization through recognition of life`s quality.
점탄성 이상유동에서 계면장력과 액적크기가 액적변형에 미치는 효과
김상대(S.D. Kim),우병철(B.C. Woo),김시조(S.J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The finite-element method was developed to analyze the deformation of a drop for the viscoelastic twophase<br/> flow. In the present study a viscoelastic drop suspended in a viscoelastic medium was considered, for<br/> which the Oldroyd B model was employed. The penalty function method was used to eliminate the pressure<br/> variables from the system equations. The shape of a highly deformed drop was described by using<br/> unstructured mesh generator and auto-remeshing techniques. The deformation of a drop was discussed for<br/> various sizes( R =0.2~0.4) and interfacial tensions( ξ=0.0~0.01). As a result, the deformation of a drop has<br/> tendency to be thicker and rounded at the front of a drop for the same drop size. This recoil Phenomena is<br/> increased with increasing the interfacial tension. As the drop size increases the deformation of a drop also<br/> increases, especially at the rear region of a drop, which looks like a dumbbell.
김상대(Sang-Dae Kim),전인오(In-Oh Jeon) 한국지능시스템학회 2017 한국지능시스템학회논문지 Vol.27 No.2
우리나라는 2015년 7월 "자본시장과 금융투자업에 관한 법률"이 통과됨으로써 다양한 형태의 모금개설과 투자가 이루어져 크라우드펀딩이 활성화될 것으로 전망되므로 본 논문은 성공적인 크라우드펀딩을 위해 펀딩에 영향을 미치는 요인들을 찾아내고자 한다. 이에 본 논문에서는 기대 수익, 인지된 위험, 촉진조건, 사회적 영향력과 같은 통합기술수용 모델 핵심변수들과 인지된 위험이 크라우드펀딩 참여의도에 미치는 영향관계를 분석하였으며, 태도의 매개효과를 검증하였다. 검증결과, 성과기대, 사회적 영향력, 촉진조건은 참여의도에 긍정적인 영향을 미치는 것으로 나타났으나 노력기대와 인지된 위험은 영향을 미치지 않은 것으로 나타났다. 태도에 의한 매개효과 검증에서는 성과기대와 사회적 영향이 참여의도에 미치는 영향에 있어서만 매개효과가 있는 것으로 나타났다. In July, 2015, the Korean national assembly passed "Act on Caitpal Markets and Financial Investments," and therefore, it waes xpected that the crowd funding would be activated owing to a variety of fundraisings and investments. Hence, for the success of the crowd funding, this paper tried to identify the factors affecting th efunding. In this study we analyzed the core variables of then Uified Theory of Acceptance and Use of Technology(UTAUT) and their perceived risks on the crowd funding participants" intentions as well as the mediating effects of the attitudes; the core variables of UTAUT were performance expectancy, perceived risk, facilitating conditions, social influence, and the like. As a result, it was found that such facilitating conditions as performance expectancy and social influence would affect crowd funding participants" intention positively, but that effort expectancy and perceived risk would not significantly affect their intention. On the other hand, as a result of testing the mediating effects of the attitudes, it was found that performance expectancy and social influence would have significant mediating effects on participants" intention.
퍼지 다층 제어기를 이용한 전방향 이동로봇의 추적제어에 관한 연구
김상대(Kim, Sang-Dae),김승우(Kim, Seung-Woo) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.4
사람이 생활하는 환경에서 일반적인 휠베이스 이동(Mobility) 방식의 로봇은 장애물에 둘러싸여 로봇의 움직 임에 있어 자유로운 주행 제약을 받게 된다. 장애물을 신속하게 회피하려면 회전과정 없이 단순히 좌우 이동만 하면 되는 홀로노믹(Holonomic) 시스템 특성의 이동로봇이 필요하다. 본 논문에서는 세 개의 옴니휠(Omni-Wheels)을 사용 한 홀로노믹 이동로봇의 추적제어기를 개발한다. 옴니휠을 이용한 이동로봇은 시스템 파라미터의 불확실성(uncertainty) 으로 인하여 선형 제어기로는 추적제어가 매우 어려운 상황이다. 그러므로 강인성이 탁월한 퍼지 제어기를 이용한 퍼 지 적응 제어 기법을 설계하여 옴니휠 이동 로봇의 추적제어(tracking control) 성능을 높인다. 본 논문에서 제어 대상 시스템의 매개 변수의 불확실성에 강인한 퍼지 제어기를 병렬로 설계하고 시스템 인식(system identification)을 이용하 여 대상 시스템이 특성 변화에 적절히 대처할 수 있는 적합한 퍼지 제어기를 선택한 후 피드백 제어를 실행하는 퍼 지 다층 제어기(Fuzzy Multi-Layered Controller) 시스템을 이용한 적응 제어기법을 제시한다. 고전 적응 제어기와 기 존 퍼지 적응 제어기의 문제점을 극복한 퍼지 적응 제어기를 도입하여 강인 제어기를 병렬로 설계하고 시스템 인식 을 이용하여 대상 시스템의 특성 변화에 적절히 대처할 수 있는 적합한 퍼지 제어기를 선택한 후 피드백 제어를 실 행하는 퍼지 다층 제어기(FMLC)를 제시한다. The trajectory control for omni-directional mobile robot is not easy. Especially, the tracking control which system uncertainty problem is included is much more difficult. This paper develops trajectory controller of 3-wheels omni-directional mobile robot using fuzzy multi-layered algorithm. The fuzzy control method is able to solve the problems of classical adaptive controller and conventional fuzzy adaptive controllers. It explains the architecture of a fuzzy adaptive controller using the robust property of a fuzzy controller. The basic idea of new adaptive control scheme is that an adaptive controller can be constructed with parallel combination of robust controllers. This new adaptive controller uses a fuzzy multi-layered architecture which has several independent fuzzy controllers in parallel, each with different robust stability area. Out of several independent fuzzy controllers, the most suited one is selected by a system identifier which observes variations in the controlled system parameter. This paper proposes a design procedure which can be carried out mathematically and systematically from the model of a controlled system; related mathematical theorems and their proofs are also given. Finally, the good performance of the developed mobile robot is confirmed through live tests of path control task.