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PV Mismatch 보상을 위한 N-벅 컨버터 기반의 PV 옵티마이저 회로 설계
이정준(Jeong-Jun Lee),강선희(Seon-Heui Kang),박광우(Kwang-Woo Park),강건민(Geon-Min Kang),소순열(Soon-Youl So),김창선(Chang-Sun Kim) 대한전기학회 2021 전기학회논문지 P Vol.70 No.2
The PV optimizer compensates the power loss due to the mismatch of PV panels. The solar power efficiency of PV panels can be increased by using the PV optimizer. Several topology can be considered for PV optimizer but the N-Buck converter is chosen for specific environment. And in this paper, it is considered for N-Buck converter design for PV optimizer. The PV optimizer is used as a power compensator between the PV module and the inverter. Each element of the N-Buck converter circuit is designed and selected by the analyzed formulas and the design conditions. As a result, we can confirm that the design is optimized through PSIM simulation and experiments.
문옥륜,강선희,이은표,좌용권,이현실 韓國保健行政學會 1993 보건행정학회지 Vol.3 No.1
A small number of high cost patients usually spend a larger proportion of scarce health resources. Korea is no exception. Under the national health insurance, 12% of the insured persons have consumed approximately half of the national health insurance expenditures. Therefore, it is necessary to identify the characteristics of the high cost patient group, if we would like to reduce them. This study has defined high cost patients as those who have spent one and half million won and over Per 6 months. The study reveals that high cost users are those who have a longer length of stays(LOS), 40 days of LOS in the 6 months, have multiple admissions, 2 to 3 admissions per 6 months and are the eiderly patients. They have Spent 814, 126won per day on the average, and commonly suffered from malignant neoplasms, circulatory diseases, fracture, diabetes mellitus, etc. Unlike the case of western developed countries, early readmissions are not the major causes of high cost spending in Korea. Undoubtedly, a lengthy admission is the main cause of large spending. Health policies should vigorously be explored to respond appropriately. There are evidences that hospital beds are often misused. As the Korean health care system is lacking in a mechanism of patient evaluation under the fee-for-service remuneration system, an idea of progressive patient care needs to be tested. The Government should set up health policy to diversify the role of long-term care facilities and encourage people to establish them. Further studies are needed to identify factors influencing large medical bills necessary for formulating the health policy on cost containment.