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단치소요산가미방이 Dexamethasone 처리한 랫드의 두개골 세포에 미치는 영향
박종형,황귀서,Park, Jong-Hyeong,Hwang, Gwi-Seo 대한예방한의학회 2006 대한예방한의학회지 Vol.10 No.2
It is well known that glucocorticoid may induce osteoporosis as its side effect in long-term therapy. The inhibition of osteoblast by glucocorticoid is also recognized as its action mechanism of decreased bone formation. In this study, the effect of DSG, Danchisoyosangamibang, on the differentiation and function of osteoblastic cells was investigated. The osteoblastic cells were isolated from rat calvariae using collagenase treatment. The cell counting, enzyme activity assay, MTT assay, collagen content assay were done to determine the cell proliferation, intracellular alkaline phosphatase (ALP) activity, bone martrix production, and cell apoptosis. DSG enhanced the cell proliferation after the culture for 10 days. ALP activity and total protein synthesis, and intracelluar collagen synthesis were increased time dependently when the cells were treated with DSG in the presence of dexamethasone. And, DSG restored calvarial cell function decreased by dexamethasone.
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Power Conditioning System for a Grid Connected PV Power Generation Using a Quasi-Z-Source Inverter
박종형,노의철,전태원,김흥근 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.1
This paper presents a grid connected photo-voltaic system using a quasi-Z-source inverter (QZSI) for power stage reduction. The power stage can be reduced because of an additional shoot-through stage which is a characteristic of QZSI. Therefore, by utilizing a QZSI the system’s efficiency can be increased. In this paper, for applying a QZSI to a PV system, control methods such as maximum power point tracking (MPPT), point of common coupling (PCC) current control and PWM are studied and verified through simulation and experiment. In order to explain the above controllers, the characteristics of a QZSI are first analyzed. Then the MPPT control technique with a modified P&O method, the PCC current control for the regulation of the dc-link capacitor voltage and the PWM methods for the proposed system are explained. The feasibility of the proposed algorithm is verified through simulation and experiment with a 3kW system.
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불평형 계통전압에서의 분산전원용 계통연계형 PCS의 전류제어기 비교
박종형,김흥근,노의철,전태원,차헌녕 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
본 논문에서는 대용량 신재생 에너지 시스템을 위한 1단 전력변환 구조의 계통연계형 PWM인버터에 적합한 전류제어기에 관한 연구를 수행하였다. 세 가지 종류의 전류 제어기를 비교·해석하였고 각각의 제어기를 설계하여 시뮬레이션을 통해 특성을 확인하였다.
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