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한국과 일본의 장기요양제도의 형성과 전개과정에 관한 비교 고찰
권성철 동아시아일본학회 2019 일본문화연구 Vol.0 No.69
The purpose of this study is to elucid the policy implication for finding the developmental alternatives of long - term care insurance system for the elderly in Korea through the comparative study on the formation and development process of the long - term care system with Japan which experienced aging before Korea. As a result of the analysis, it was concluded that developmental alternatives such as building an integrated care policy system, strengthening preventive function of long - term care system, and the reinforcement of education of the specialized personnel in long-term care accommodation. This study firstly discusses the current status and the formation process of the long - term care system of both countries. Second, the policy tasks and development plans of the long - term care policies of the two countries were compared and analyzed. Through this study, it is important to derive the implications of social welfare which is important for the development plan of long - term care insurance system in Korea.
Numerical Feasibility Study for a Spaceborne Cooler Dual-function Energy Harvesting System
권성철,오현웅 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.3
Spaceborne cryocoolers produce undesirable micro-vibration disturbances during their on-orbit operation, which are a primary source of image-quality degradation for high-resolution observation satellites. Therefore, to comply with the strict mission requirement of high-quality image acquisition, micro-vibration disturbances induced by cooler operation have always been subjected to an isolation objective. However, in this study, we focused on the applicability of energy harvesting technology to generate electrical energy from micro-vibration energy of the cooler and investigated the feasibility of utilizing harvested energy as a power source to operate low-power-consumption devices such as micro-electromechanical system (MEMS) devices. A tuned mass damper (TMD)-type electromagnetic energy harvester combined with a conventional passive vibration isolator was proposed to achieve this objective. The system performs the dual functions of electrical energy generation and micro-vibration isolation. The effectiveness of the strategy was evaluated through numerical simulations.
의탄성 형상기억합금 메쉬 와셔가 적용된 수동형 진동절연기의 수학적 등가모델 도출
권성철,전수현,오현웅,Kwon, Sung-Cheol,Jeon, Su-Hyeon,Oh, Hyun-Ung 항공우주시스템공학회 2014 항공우주시스템공학회지 Vol.8 No.3
A passive launch and on-orbit vibration isolator using SMA(Shape Memory Alloy) washer for both the structural safety of the micro-vibration source by attenuating the transmitted force under launch loads and the micro-vibration isolation during their on-orbit operation has been proposed, which does not require the additional launch locking mechanism. To measure the characteristics of SMA mesh washer, we performed compressive loading tests with a single SMA mesh washer and a vibration isolator using SMA mesh washer. The numerical equivalent model of vibration isolator using SMA mesh washer composed of two spring and viscous damping elements has been verified that both stiffness and viscous damping varied with respect to compressed deformations. In addition, the effectiveness of launch loads and micro-vibration reduction has been investigated through the dynamic characteristics measurement test of cooler assembly combined with passive vibration isolator.
우주용 냉각기 미소진동 절연을 위한 에너지 재생형 진동절연시스템
권성철,오현웅 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.4
위성용 적외선 센서를 극저온으로 유지하기 위해 Pulse Tube-type의 우주용 냉각기가 사용되며, 이는 궤도 운용 시 미소진동을 발생하여 고해상도 관측위성의 지향성능을 저하시키는 원인으로 작용한다. 따라서 고 해상도 영상을 획득하기 위해 일반적으로 냉각기로부터 발생하는 미소진동은 항상 차폐의 대상으로만 존재하였다. 본 연구에서는 이에 주목하여 동 흡진기 형태의 에너지 재생형 진동절연시스템을 고안하였으며, 이를 기존의 수동형 진동절연기에 결합함으로써 냉각기로부터의 미소진동 에너지를 전기에너지로 재생함과 동시에 진동절연 성능의 확보가 가능함을 수치해석을 통해 입증하였다. Pulse Tube-type Spaceborne cryocooler is widely used to cool down the infrared sensor of observation satellite. However, it generates a micro-vibration which is the one of the source to degrade the pointing performance during on-orbit operation. Therefore, a micro-vibration has always been subjected to an useless isolation objective. In this study, we have proposed the tuned mass damper type energy harvesting vibration isolation system combined with an existing passive micro-vibration isolator to generate electrical energy from the spaceborne cryocooler micro-vibration and to obtain the additional isolation performance. The feasibility of the energy harvesting isolation system has been investigated through the numerical simulation.