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아날로그 히스테리시스 전류 제어기를 적용한 3상 PWM 컨버터 개발
이영국(Young-kook Lee),노철원(Chul-won Noh) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Due to several advantages of Pulse Width Modulation (PWM) Converter, such as unity power factor operation, elimination of low-order harmonics and regeneration of motor braking energy to source, the application range of PWM Converter has been rapidly extended in industrial application. Nowadays, vector control algorithm and space vector PWM(SVPWM) method are applied to improve the performances of PWM Converter, but vector control algorithm and SVPWM require to use Microprocessor and other digital devices in hardware, causing costly and somewhat large dimension system.<br/> In every practical application of energy conversion equipments, the design and implementation should be carried out considering cost and performance. High performance and low cost is the best choice for energy conversion equipments.<br/> So, this paper presents the practical design method and implementation results of 3-phase PWM Converter with analog hysteresis current controller, and verifies the performances of unit power factor operation and energy regeneration operation via experimental results.
V-Nb Microalloyed 강의 오스테나이트역에서 복합 탄질화물의 재용해 및 석출 거동
이영국 ( Young Kook Lee ),정재길 ( Jae Gil Jung ),하양수 ( Yang Soo Ha ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.12
Dissolution and precipitation behaviors of complex carbonitrides in austenite of a V-Nb microalloyed steel were quantitatively examined through electrical resistivity measurement and transmission electron microscopy. The electrical resistivity increased with solution treatment temperature up to 1240℃ and then was saturated at 225 nΩm for a holding time of 10 min. The electrical resistivity method was also used to quantitatively measure the isothermal precipitation kinetics of the complex carbonitrides in austenite. Nbrich precipitates were observed in austenite at the early stages of precipitation, but Nb was replaced by V up to the equilibrium amount within the precipitates with further holding time. The time-temperatureprecipitation diagram showed a C-type curve; nose temperature and its incubation time were 900℃ and 100 s, respectively.
논문 : 상변태 ; Fe-Mn 이원계합금의 γ→ε 마르텐사이트변태에 대한 열역학
이영국 ( Young Kook Lee ),전중환 ( Joong Hwan Jun ),최종술 ( Chong Sool Choi ) 대한금속재료학회 ( 구 대한금속학회 ) 1996 대한금속·재료학회지 Vol.34 No.11
In order to avoid the confusion due to inconsistency between thermodynamic calculations(free energy difference between γ and ε, △G γ→ε of γ→ε martensitic transformation for Fe-Mn binary alloys reported by previous workers, the thermodynamic data of Fe-Mn alloys, △G(γ→ε)Fe and △G(γ→ε)Mn, were newly formulated, and the thermodynamic calculations of γ→ε martensitic transformation for the Fe-Mn binary alloys were performed with a regular solution model. The calculation results were well consistent with experimental results in wide range of 15 to 28wt%Mn, and were closely approached to Takaki`s calculation results rather than Murakami`s calculation results.
HBV-trimera 동물모델을 통한 B형 간염 항체의 효능평가에 관한 연구
강영국(Young Kook Kang),장명희(Myeong Hee Jang),김근수(Keun-Soo Kim),오미숙(Mee Sook Oh),김남재(Nam Jae Kim),이병석(Byung Seok Lee),이은나(Eun Na Lee),김성주(Sung Joo Kim),류춘제(Chun Jeih Ryu),홍효정(Hyo Jeong Hong) 한국실험동물학회 2005 Laboratory Animal Research Vol.21 No.1
Humanized Balb/c mice (termed Trimera mice) conditioned by lethal total body irradiation and bone marrow transplantation from NOD/SCID mice have been described to support efficient engraftment of human tissues. To evaluate the efficacy of potential anti-HBV agents in vivo, we, here, describe the development of a mouse Trimera model for human hepatitis B virus (HBV) infection. HBV viremia was induced by transplantation of ex-vivo HBV-infected human liver fragments under the kidney capsule of Trimera mice (HBV-Trimera). The levels of HBV viremia were determined by measuring serum HBV DNA using polymerase chain reaction (PCR) at 10 days after liver transplantation. In order to evaluate the therapeutic potential of two humanized monoclonal antibodies specific to hepatitis B surface antigens, the HBV-Trimera mice were administrated intraperitoneally with anti-HBs antibody (HzSIII) or anti-preS1 antibody (AP301) at days 14 to 17 post-liver transplantation. Treatment of the HBV-Trimera mice with two anti-HBV humanized monoclonal antibodies (HzSIII, AP301) reduced the viral load in their sera in a dose-dependent manner, suggesting that the humanized antibodies will be useful in the prevention and treatment of HBV infection. These results suggest that the HBV-Trimera mice can be used as an animal models for evaluating therapeutic efficacy of anti-HBV agents.
3상 PWM Converter를 위한 정지 좌표계법 Analog 제어기 설계 및 시뮬레이션
이영국(Young-kook Lee),노철원(Chul-won Noh),최종률(Song-yul Choe) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
Due to several advantages of pulse width Modulated(PWM) Converter, such as unity power factor with low-harmonics and energy regeneration, PWM convener has been widely used in industrial application<br/> In every application of energy conversion equipment, the design and Implementation must be carried out considering performance and cost High quality with low cost is me best choice for energy conversion equipment<br/> High dc link voltage can reduce Inverter and motor side losses and system dimension compare to low dc link voltage-Analog controller can make PWM converter cheaper without considerable degradation of the performance than digital Controller. This paper shows the simplified analog controller for 600V dc link voltage using stationary reference frame control and the simulation results