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CIGS 박막 태양전지의 조성 최적화를 통한 셀 특성 개선
손경태,김민영,신준철,조성희,양계준,임동건 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-
Cu(In,Ga)Se2 (CIGS) thin films were fabricated with varying Ga and Cu compositions. Ga/(In+Ga) were varied between 0.1 and 0.41. Cu/(In+Ga) were varied between 0.4 and 0.97. Solar cells were fabricated by co-evaporation using the CIGS layers as absorbers. The influence of composition on the CIGS layer structural, chemical properties were studied. The CIGS thin films were characterized by scanning electron microscopy, energy-dispersive spectroscopy. Grain size in the films increased with increasing Cu composition. At a Cu/(Ga+In) of 0.85 and Ga/(In+Ga) of 0.33, CIGS layer has the optimized contents with Cu 23.88 at%, In 18.05 at%, Ga 9.01 at% and Se 49.06 at%. Optimizing the compositions of CIGS layer resulted in a CIGS solar cell with an efficiency of 13.61%.
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구견서 국제기독교언어문화연구원 2001 기독교언어문화논집 Vol.5 No.-
This study aims to construct 'Internationalology' as a new sociology and investgate International Society based on Christian Though. The questions and propositions about internationalology were largely spurred by internationalization and globalization in civil, christian, local, and international societies. The system of internationalology consists of three factors, that is to say, subject I ㆍ II, international society I ㆍ II, and theories of internationalology. In the context of internationalology, I systematically studied dimensions of international societies that has been constructed by internationalists. I try to provide new sociology to how subjests act, how they develop their international society, and how they function in the context to the international system. The conclusion that subjests are well suited to structuring international society, I should stress, comes from a wish to reduce international conflicts, and to establish international peace and God's love. Internationalology depends on humanism post-nationalism the theory of post-class, toying-ism, and principle of civil sovereignty.
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BLDC 전동기에서 PWM 방식에 따른 토크리플 저감에 관한 연구
김상훈,권경준 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A
This paper presents a current control strategy to reduce torque ripple of Brushless DC Motor in commutation period with PWM pattern. The torque ripple is mainly caused by the inequality in the rate of change between rising current and decaying one during commutation. And also it is influenced by the shape of real back EMF. Therefore, in the proposed control strategy, considering real back EMF a compensation voltage is generated to equalize the rate of change in these commutating currents. And then, by providing the compensation voltage in commutation period with PWM pattern, the torque ripple can be reduced. The simulation and experimental results verify that the proposed method can reduce the torque and the current rippies significantly.
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Exploring the Hidden Meaning of Care through the Life History of a 53-year-old Woman
Myungin Kyeon(Myungin Kyeon),Seungnam Son(Seungnam Son) 아시아질적탐구학회 2022 아시아질적탐구 Vol.1 No.2
This study is based on the story of a woman who has been caring for children and the elderly for a living. As a mother of three children she supported her mother-in-law with Alzheimer's for over 20 years. This paper tried to explore the meaning of care through the life history of a 53-year-old woman and discover its implications for pedagogy. As results, first, the meaning that 'life is a period of vulnerability(Donna J. Haraway)' came to light through the characters surrounding this woman's family history; Second, the fact that the relationship between the caregiver and the person being cared for is the core of a good care relationship became clear; Third, since care is already a relationship in itself, care work is a labor of love and relationships that cannot be standardized or objectified. Finally, the meaning of care work illuminated that self-care and care for others are constantly interacting. The family discord experienced by the participant due to solitary care work gave social, political and economic suggestions that care work was passed entirely on to women. This life history research with a participant K suggested also possibilities of inventing a new viewpoint of humanity and a new mode of human relationship through care work. So this study presented a new task for pedagogy in that care is the knowledge that anyone should and can learn.
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Xanthomonas euvesicatoria Causes Bacterial Spot Disease on Pepper Plant in Korea
Kyeon, Min-Seong,Son, Soo-Hyeong,Noh, Young-Hee,Kim, Yong-Eon,Lee, Hyok-In,Cha, Jae-Soon The Korean Society of Plant Pathology 2016 Plant Pathology Journal Vol.32 No.5
In 2004, bacterial spot-causing xanthomonads (BSX) were reclassified into 4 species-Xanthomonas euvesicatoria, X. vesicatoria, X. perforans, and X. gardneri. Bacterial spot disease on pepper plant in Korea is known to be caused by both X. axonopodis pv. vesicatoria and X. vesicatoria. Here, we reidentified the pathogen causing bacterial spots on pepper plant based on the new classification. Accordingly, 72 pathogenic isolates were obtained from the lesions on pepper plants at 42 different locations. All isolates were negative for pectolytic activity. Five isolates were positive for amylolytic activity. All of the Korean pepper isolates had a 32 kDa-protein unique to X. euvesicatoria and had the same band pattern of the rpoB gene as that of X. euvesicatoria and X. perforans as indicated by PCR-restriction fragment length polymorphism analysis. A phylogenetic tree of 16S rDNA sequences showed that all of the Korean pepper plant isolates fit into the same group as did all the reference strains of X. euvesicatoria and X. perforans. A phylogenetic tree of the nucleotide sequences of 3 housekeeping genes-gapA, gyrB, and lepA showed that all of the Korean pepper plant isolates fit into the same group as did all of the references strains of X. euvesicatoria. Based on the phenotypic and genotypic characteristics, we identified the pathogen as X. euvesicatoria. Neither X. vesicatoria, the known pathogen of pepper bacterial spot, nor X. perforans, the known pathogen of tomato plant, was isolated. Thus, we suggest that the pathogen causing bacterial spot disease of pepper plants in Korea is X. euvesicatoria.
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연구논문(硏究論文): 20세기 웨딩드레스의 유행변화에 관한 연구1
신경섭 ( Kyeon Gseub Shin ) 한국패션비즈니스학회 2011 패션 비즈니스 Vol.15 No.5
The objective of this research is to unveil the dynamic changes of the trends in wedding dresses during the 20th Century. The studies were carried out in two forms; firstly by observing the actual wedding dresses worn by people at that time, and secondly by conducting formative comparisons between those dresses with the ones appeared in movies corresponding to that period. Movies provide an invaluable insight into the era`s wedding dresses fashion trends since they function as intimate bridges in connection with the time`s audience, and the visible imageries accurately reflect the characteristics embedded within that time frame. As there are no precedent studies regarding this topic, this thesis can serve as vital research data for the wedding dress industry. Research data regarding the actual wedding dresses were collected from books and museum web sites. The object of movies were films produced before World War II that contained both the background settings of the 20th Century and wedding dresses, of which photographic imageries were captured. Research analysis was then conducted by merging these data with findings from relevant books and internet materials. The results of the thesis are as the following: The 1900s was an extension of the 19th Century`s popular fashion trend which can be characterized as the S curve silhouettes of the Edwardian period when long trains and long veils symbolized wealth and social power. In the 1910s, high waist silhouettes with softwrinkles were prevalent as attire suitable for active mobility with practical functionality were highly regarded. During the 1920s, the flapper style became the dominant trend. Hem lines of the skirts were curled in the form of the scallop and laces were the most widely used raw materials. By the 1930s, wedding dresses that reinterpreted the glamorous sheath lines, practical two piece styles, and retro-styles became predominant. The 1940s saw the advent of ready-made wedding dresses made of synthesized materials; practical military style suits and casuals sometimes substituted the wedding dresses. And although the wedding dresses in the movies were primarily costumes to express the personalities of the characters, they were also reinterpreted as manifestations of the formative characteristics of each relative period that pursued very distinct and diverse features.
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