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2단 DC-DC 컨버터로 구성된 배터리 에너지저장용 계통연계형 전력변환장치
박아련(Ah-Ryeon Park),김도현(Do-Hyun Kim),김경태(Kyeong-Tae Kim),한병문(Byung-Moon Han),이준영(Jun-Young Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
This paper proposes a new grid-tied power conditioning system for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through theoretical analysis and computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.
오현종,박정식,박아련,편석원,김양균 대한의사협회 2011 대한의사협회지 Vol.54 No.2
Primary care lays the foundation of national healthcare systems, but it has been weak in playing its role correctly because of legal and environmental attributes surrounding the healthcare industry in Korea. This study is conducted to concretize the definition and scope of primary care and to deduce its standard functions to contribute to establishing the healthcare delivery system and appropriate healthcare systems embracing socio-environmental leverage. The term primary healthcare institution was adopted based on literature review to achieve the research goal. The principle diseases appropriate for the primary healthcare institution based on ambulatory care sensitive conditions were analyzed, and the standard functions were deduced by matching these diseases with current procedural terminologies using CrossCoder package. Based on the analysis,the primary healthcare institution-specific diseases were 53 specific diseases under 23 broad disease groups. The standard functions were deduced in three categories of the standard functions of the entire primary healthcare institutions with 100% frequency, common standard functions with 70% frequency, and peculiar standard functions specific to diseases or body systems. These functions included outpatient evaluation and measurement, various factor tests through blood collection, and X-ray. Establishing the standard functions for the primary healthcare institution can promote patient reliability on primary care, alleviate health demand congestion toward large-sized advanced healthcare institutions. Furthermore, it contributes to establishing and reinforcing other healthcare policies related to the healthcare reimbursement system and referral system, and fosters primary care physician education. Most importantly, it reduces the national health expenditures by realizing efficient and effective healthcare delivery.