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군사학과 대학생의 직업선택동기와 전공만족에 셀프리더십의 매개효과가 미치는 영향에 관한 연구
김덕기 한국수산해양교육학회 2023 水産海洋敎育硏究 Vol.35 No.3
The purpose of this study is to examine the mediating effect of self-leadership on job choice motivation and major satisfaction among college students majoring in military. In order to achieve the purpose of this study, a total of 316 questionnaires were analyzed with a population of military department college students from 5 universities across the country. The research results are as follows. First, job choice motivation showed a positive relationship on major satisfaction. Second, among the subcomponents of self-leadership, a behavior-focused strategy and a natural reward strategy had significant positive relationships on major satisfaction, whereas a constructive thinking strategy showed unrelated results. Third, job choice motivation showed a positive relationship on self-leadership. Finally, self-leadership showed a mediating effect on job choice motivation and major satisfaction. The results of this study expanded the scope of research by revealing that self-leadership has a positive influence on major satisfaction of college students. In addition, the academic concept was supplemented by identifying the positive influence relationship between Job choice motivation and self-leadership.
리액터에 의한 가변주파수 구동장치의 고조파저감효과 분석
김덕기,윤경국,김희문,Kim, Deok-Ki,Yoon, Kyoung-Kuk,Kim, Hee-Moon 해양환경안전학회 2015 海洋環境安全學會誌 Vol.21 No.6
본 논문에서는 전동기 구동장치를 선정하여 리액터 용량 및 종류, 부하의 크기에 따라 고조파 왜형률 변화추이를 검토하여 선박 및 해양플랜트에 적용 가능한 최적의 용량선정 근거를 마련하였다. AC라인 리액터와 DC링크 리액터는 가변주파수 구동장치 입력전류의 고조파를 크게 저감시키는 역할을 하며, 동일한 효과를 얻기 위한 DC링크 리액터의 인덕턴스가 AC라인 리액터 인덕턴스의 약 1.7배가 되어야 한다는 것을 시뮬레이션을 통하여 고찰하였다. 소프터웨어 PSIM을 활용하여 각 상황에 따른 전류 고조파 왜형률을 분석하였다. Recently, due to the rapid development of Power Electronics, the usage of Non Linear Load variable frequency drivers (VFDs) is increasing in the electric propulsion vessels and offshore plants. And harmonics which is generated by the variable frequency drives is an important issue should be solved. Ac line reactors and dc link reactors are widely used in variable frequency drives to improve the drive performance such as reducing input current harmonics, elevating input power factor, and protecting the drives from surges, etc. The effectiveness of both types of reactors in reducing input harmonics is affected by the loading of the drives and the system source impedance. And it considered that inductance of DC link reactors should be about 1.7 times of AC line reactors for same effect. The rules to evaluate the needs and effectiveness using ac line or dc link reactors are proposed for practical appications. In this paper, a simulation is performed to investigate of such factors using software PSIM.