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실버대학 프로그램 이용노인의 입학 전 신체적 증상과 입학 후 심리상태에 관한 연구
한대수(Han, Dae-Soo),조성제(Cho, Sung-Je) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.10
본 연구의 목적은 실버대학 프로그램 이용노인의 입학 전 신체적 증상과 입학 후 심리상태를 분석하고자 한 다. 연구대상은 2013년5월 1일 부터 5월 31일 까지 부산시에 소재한 B대학교와 K대학교의 실버대학 이용노인을 대 상으로 설문조사를 110명에게 실시하였다. 자료 분석은 SPSS Win 18.0 프로그램을 사용하여 빈도분석, 일원변량분석, 상관분석, 단순회귀분석, 다중회귀분석, 등을 실시하였고, 실증분석은 유의수준 5%에서 검증하였다. 연구결과는 입학 전에는 신체적 증상이 심각하였으나 입학 후에는 심리상태가 안정적으로 호전되었다. 본 연구의 결과에 의한 시사점 은 고령화 사회의 노인들의 신체적, 정신적 문제를 해결하기 위한 전문가들로 구성된 프로그램 개발 및 정책에 활용 할 수 있는 기초자료가 될 것으로 사료 된다. The purpose of this study is to analyse the satisfaction level and psychological status of senior students of "Silver College," or seniors' college. For the analysis, questionnaire survey was conducted to senior students of Silver Colleges of B and K University in Busan from May 1 through 31, 2013. The analysis methods used are SPSS Win 18.0 program on analysis of frequency, one-way analysis of variance, a correlation analysis, simple regression analysis and multiple regression analysis, with analysis of actual proof for 5% significance level. The result of analysis indicates that the senior students' satisfaction level rose and serious physical symptoms improved after taking silver college programs from before. This study is significant in that it provides theoretical grounds for increasing the number of silver colleges with professional and socially-renowned professors as faculty, and developing further programs and policies for the solution of aggravating physical and mental problems more and more senior people are faced with in this fast aging society.
Dae-Su Han(한대수),Yong-Sug Suh(서용석) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.1
This paper investigates control algorithms for a doubly fed induction generator with a back-to-back three-level neutral-point clamped voltage source converter in a medium-voltage wind power system under unbalanced grid conditions. Negative sequence control algorithms to compensate for unbalanced conditions have been investigated with respect to four performance factors: fault ride-through capability, instantaneous active power pulsation, harmonic distortions, and torque pulsation. The control algorithm having zero amplitude of torque ripple indicates the most cost-effective performance in terms of torque pulsation. The least active power pulsation is produced by a control algorithm that nullifies the oscillating component of the instantaneous stator active and reactive power. A combination of these two control algorithms depending on operating requirements and depth of grid unbalance presents the most optimized performance factors under generalized unbalanced operating conditions, leading to a high-performance DFIG wind turbine system with unbalanced grid adaptive features.
Compensation of Unbalanced PCC Voltage in an Off-shore Wind Farm of PMSG Type Turbines
Ja-Yoon Kang(강자윤),Dae-Su Han(한대수),Yong-Sug Suh(서용석),Byoung-Chang Jung(정병창),Jeong-Joong Kim(김정중),Jong-Hyung Park(박종형),Young-Joon Choi(최영준) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.1
This paper proposes a control algorithm for permanent magnet synchronous generators with a back-to-back three-level neutral-point clamped voltage source converter in a medium-voltage off-shore wind power system under unbalanced grid conditions. Specifically, the proposed control algorithm compensates for unbalanced grid voltage at the PCC (Point of Common Coupling) in a collector bus of an off-shore wind power system. This control algorithm has been formulated based on symmetrical components in positive and negative synchronous rotating reference frames under generalized unbalanced operating conditions. Instantaneous active and reactive power is described in terms of symmetrical components of measured grid input voltages and currents. Negative sequential component of AC input current is injected into the PCC in the proposed control strategy. The amplitude of negative sequential component is calculated to minimize the negative sequential component of grid voltage under the limitation of current capability in a voltage source converter. The proposed control algorithm enables the provision of balanced voltage at the PCC resulting in the high quality generated power from off-shore wind power systems under unbalanced network conditions.