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3상 양방향 인버터의 계통전압 불평형 및 왜곡에 의한 계통전류 보상
양승대,김승민,최주엽,최익,송승호,이상철,이동하,Yang, Seung-Dae,Kim, Seung-Min,Choi, Ju-Yeop,Choy, Ick,Song, Seung-Ho,Lee, Sang-Cheol,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
This paper presents the algorithm of the compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it sugest simple method to solve the problem. PSIM simulation is used to validate the proposed algorithm.
< 51Cr > Cr ( III )-EDTA 착물 합성 및 < 51Cr > Cr ( III )-EDTA 주사후 두경부 방사능 계측에 의한 사구체 여과율 측정
양승대,임상무,전권수,서용섭,윤용기,박현,우광선,정위섭,오옥두,이종두 ( Seung Dae Yang,Sang Moo Lim,Kwon Soo Chun,Yong Sup Suh,Yong Ki Yoon,Hyun Park,Kwang Sun Woo,Wi Sup Chung,Jong Doo Lee,Ok Doo Oh ) 대한핵의학회 1994 핵의학 분자영상 Vol.28 No.3
The purpose of this study is to evaluate the clinical application of the no carrier added[Cr] Cr(UI) EDTA complexes, produced at Korea Cancer Center Hospital. The [Cr]Cr(lll) EDTA complexes, useful for measurement of GFR were prepared at room temperature in the presence of bicarbonate catalysts. The radiochemical purity of[Cr]Cr (Iil) EDTA was over 99% by paper electrophoresis. The time activity curves were obtained by counting the blood samples from 5 volunteers and counting the head and neck regions with whole body counter after inject#ion of the Cr EBTA, respectively, After the nonlinear regression, the area under curve was obtained. The plasma clearance of the Cr-EDTA was calculated with injected dose/AUC. The clearance rate calculated with the head and neck countmg data was in good agreement with t,he result from the plasma sample radioactivity at, 1-3 hrs after injection. From this result, the counting of head and neck region and the nonlinear regression by 2-compartment model could be applied for the measurement of the clearance rate. Using MIRD system, the absorbed radiation dose was calculated by residence time x S. The absorbed whole body radiation dose was negligibly small.
코어 종류에 따른 PCS 인덕터와 트랜스포머 손실 분석
양승대(Yang Seung-Dae),심재휘(Shim Jae-Hwe),최주엽(Choi Ju-Yeop),송승호(Song Seung-Ho),최익(Choy Ick),안진웅(An Jin-Ung) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.2
In recently, inductor and transformer is the common device using widely in the photovoltaic system and power electronics. Therefore, each inductor and transformer has different core loss and iron loss depending on the size and kinds of core materials, it is important to analyze loss characteristics for better transformer efficiency. This paper offers an efficiency calculation method for PCS inductor and transformer loss, and different kinds of core materials are analyzed for optimized PCS design.
양승대(Yang Seung-Dae),심재휘(Shim Jae-Hwe),최주엽(Choi Ju-Yeop),송승호(Song Seung-Ho),최익(Choy Ick),안진웅(An Jin-Ung),이동하(Lee Dong-Ha) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Now, inductor is the common device using widely in the photovoltaic system and power electronics. Therefore, each inductor has different core loss and iron loss depending on the size and kind of core materials, it is important to analyze loss characteristic for better inductor efficiency. This paper offers an efficiency calculation for PCS inductor loss, and different kinds of core materials are analyzed for optimized PCS inductor design.
양승대(Yang, Seung-Dae),정승환(Jung, Seung-Hwan),최주엽(Choi, Ju-Yeop),최익(Choy, Ick),이상철(Lee, Sang-Chul),이동하(Lee, Dong-Ha) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
This paperis aboutthe study ofa stand-alone photovoltaic powerconditioning system with an energy storage system with battery.The paper proposes the appropriate circuit modelof stand-alone PV PCS considering the maintenance of the battery system. It also proposes the buck converter modeling by a state-spaceaveraging method considering characteristics of solar cell. Lastly, it shows the way to choose the suitable battery and to design the model of bi-directional converter for charging and discharging battery. PSIM simulation is used to validate the proposed algothim of the system.
자립형 태양광 발전 시스템을 위한 3상 양방향 DC-AC 인버터 연구
양승대(Yang Seung-Dae),정승환(Jung Seung-Hwan),최주엽(Choi Ju-Yeop),최익(Choy Ick),이영권(Lee Young-Kwon) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
This paper presents the study of 3-Phase bi-directional DC to AC inverter with unity power factor. 3-Phase bi-directional DC to AC inverter is important for the bi-modal PV PCS with an energy storage system. Both Inverting and converting are needed to connect between the grid side and boost converting side to charge and discharge the energy storage system. The paper proposes the appropriate circuit topology and proper control system for the bi-directional inverter. It also proposes the method of selecting the optimum control method considering system stability. PSIM simulation is used to validate the proposed algorithm.
태양광 PCS의 계통 연계를 위한 Digital PLL 기법
양승대(Yang Seung-Dae),심재휘(Shim Jae-Hwe),홍기남(Hong Ki-Nam),최익(Choy Ick),최주엽(Choi Ju-Yeop),이상철(Lee Sang-Cheol),이동하(Lee Dong-Ha) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문은 최근 빠른 속도로 성장하고 있는 신재생에너지 분야 중 태양광을 이용한 계통연계형 PV PCS의 PLL(Phase Locked Loop) 기법을 DSP로 처리할 수 있도록 디지털 논리회로로 구현하는 DPLL(Digital Phase Locked Loop) 기법을 제시하고 모델링과 시뮬레이션을 통하여 검증한다.
최창운,양승대,우광선,정위섭,임수정,서용섭,전권수,안순혁,이종두,홍성운,임상무 ( Chang Woon Choi,Seung Dae Yang,Kwang Sun Woo,Wee Sup Chung,Soo Jung Lim,Yong Sup Suh,Kwon Soo Chun,Soon Hyuk Ahn,Jong Doo Lee,Sung Soon Hong,Sang Moo Lim 대한핵의학회 1998 핵의학 분자영상 Vol.32 No.3
Purpose : The aim of this sutdy was to evaluate the feasibility of 3-[131I]Iodo-O-methyl-L-a-methyltyrosine ([131I]OMINT) as an agent for tumor image. Materlals and Methods: After synthesis of 4-O-methyl-L-a-methyltyrosine (OMAMT), OMAMT was labeled with 131I using Iodogen method. In viro cellular uptake study was performed using 9 L gliosarcoma cells at various time points upto 4 hr. The biodistribution (five rats implanted with the 9 L gliosarcoma cells per group) was evaluated at 30 min, 2 hr, 24 hr after iv injection of 3.7 MBq [131I]OMIMT or L-3-[131I]iodo-a-methyltyrosine ([131I]IMT). Gamma camera images were obtained at 30min, 2 hr, and 24 hr. Results : [131I]OMINT uptake was 3.3 times and 2.5 times higher than [131I]IMT uptake at 30 min and 60 min, respectively and same after 2 hr in in vitro sutdy using 9L gliosarcoma cells. Maximum accumulation in tumor occurred at 30 min for both [131IOMINT and [131I]IMT in tumor bearing rats. The tumor uptake of [131I]OMINT was significantly higher than that of [131I]IMT in tumor bearing rats. The tumor uptake of [131I]OMIMT was significantly higher than that of [131I]IMT at early time point studied (3.74 +- 0.48 vs 0.38 +- 0.17% ID/g at 30 min and 2.40 +- 0.17 vs 0.24 +- 0.03% ID/g at 2 hr, respectively, p<0.01). However, the tumor uptake of both radiolabels were not significantly different at 24 hr (0.04 +- 0.01 vs 0.05 +- 0.01% ID/g). Tumor was visualized as early as at 30 min in gamma camera images. Conclusion : These data suggested that [131I]OMIMT might be a useful tumor imaging agent and has more advantage for the tumor imaging compared to [131I]IMT. (korean J NuclMed 1998;32;290-7)