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A Study On Novel MPPT Method Using Averaging of Voltage Ripple
Hae-Ryong Choi,Jae-Surk Gho,Gyu-Ha Choe,Heung-Geun Kim,Woo-Surk Shin 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Of two photovoltaic systems such as stand-alone type and utility interactive one, the utility interactive systems are so valuable for power peak-cut particularly in summer season For the maximum power point tracking(MPPT) by which the generating energy can be maximized, many control methods have been reported up to now. To overcome the disadvantages of the conventional ones, a new MPPT algorithm is proposed which can improve both tracking ability and generating efficiency of photovoltaic system without chopper.<br/>
진단용 방사선 발생장치 안전관리를 위만 교육현안과 현주소
송태호,고흥,김명희,Song Tea-ho,Gho Heung,Kim Myung-hoe 대한방사선사협회 2002 대한방사선사협회지 Vol.28 No.1
1. Purpose Presently, the service areas of those who we engaged in radiation works are being specialized. Thus, in this study, we propose a way for efficiently improving mutual relationship between the works of the radiation technicians(radiologists) and
전압리플 평균화를 이용한 새로운 MPPT기법에 관한 연구
최해룡(Hae-Ryong Choi),고재석(Jae-Seok Gho),최규하(Gyu-Ha Choe),김훙근(Heung~Geun Kim),신우석(Woo-Seok Shin) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Of two photovoltaic systems such as stand-alone type and utility interactive one, the utility interactive systems are so valuable for power peak-cut particularly in summer season. For the maximum power point tracking (MPPT) by which the generated energy can be maximized, many control methods have been reported up to now. To overcome the disadvantages of the conventional ones, a new MPPT algorithm is proposed which can improve both tracking ability and generating efficiency of photovoltaic system without chopper.
Airway exposure levels of lipopolysaccharide determine type 1 versus type 2 experimental asthma.
Kim, Yoon-Keun,Oh, Sun-Young,Jeon, Seong Gyu,Park, Heung-Woo,Lee, Soo-Yeon,Chun, Eun-Young,Bang, Boram,Lee, Hyun-Seung,Oh, Min-Hee,Kim, You-Sun,Kim, Jong-Hoon,Gho, Yong Song,Cho, Sang-Heon,Min, Kyung- Williams Wilkins 2007 JOURNAL OF IMMUNOLOGY Vol.178 No.8
<P>Allergic asthma is characterized by airway inflammation initiated by adaptive immune responses to aeroallergens. Recent data suggest that severe asthma may be a different form of asthma rather than an increase in asthma symptoms and that innate immune responses to LPS can modulate adaptive immune responses to allergens. In this study, we evaluated the hypothesis that airway exposure to different doses of LPS induces different form of asthma. Our study showed that neutrophilic inflammation and IFN-gamma expression were higher in induced sputum from severe asthma patients than from mild to moderate asthmatics. Animal experiments indicated that allergen sensitization with low-dose LPS (0.1 microg) induced type 2 asthma phenotypes, i.e., airway hyperresponsiveness, eosinophilic inflammation, and allergen-specific IgE up-regulation. In contrast, allergen sensitization with high-dose LPS (10 microg) induced asthma phenotypes, i.e., airway hyperresponsiveness and noneosinophilic inflammation that were not developed in IFN-gamma-deficient mice, but unaffected in the absence of IL-4. During the allergen sensitization period, TNF-alpha expression was found to be enhanced by both low- and high-dose LPS, whereas IL-12 expression was only enhanced by high-dose LPS. Interestingly, the asthma phenotypes induced by low-dose LPS, but not by high-dose LPS, were completely inhibited in TNF-alpha receptor-deficient mice, whereas the asthma phenotypes induced by high-dose LPS were abolished in the homozygous null mutation of the STAT4 gene. These findings suggest that airway exposure levels of LPS induces different forms of asthma that are type 1 and type 2 asthma phenotypes by high and low LPS levels, respectively.</P>