• Title/Summary/Keyword: Damyang

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A Study on the Systematization Design Technique of a Differential Transformer (차동변압기의 계열화 설계 기법에 관한 연구)

  • Cho K.J.;Lee J.I.;Yoon S.A.;Cha I.S.;Lee K.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.162-167
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    • 2003
  • In this paper, systematization design method by analogical Interpretation which is profitable in the compatability and standardization of developed products and is useful of reducing construction time and price was introduced. Systematization design based on analogical interpretation is a method which systematizes each characteristic with mathematical description in order to make variable design parameters correspond with the terms desired. In this paper, after choosing a differential transformer as the sample for design components each characteristic was expressed mathematically by analogical interpretation and miniaturized ones were manufactured by similarity factors. The relationship between input voltages of an actual differential transformer and the model and output voltages occurred by the change of the displacements in operational axis was shown.

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Study of Harmonic Influences in case of system-connections of Dispersed Substitute Energy-Generation Power Systems (분산전원의 계통연계시 고조파 영향 고찰)

  • Kim, Yeong-Min;Hwang, Jong-Sun;Kim, Jong-Man
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.569-572
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    • 2002
  • The reduction method of harmonic currents is very important, when harmonic influences of the systems connections of AC power lines with dispersed generations like solar energy and wind power generation etc, increase more and more. Which the influences of harmonic currents bring not only the drop of power quality but also many trouble occurrences of various systems. Recently, the necessity about application development of new substitute energy has gone up, and the development and practical use of dispersed power lines are proceeding now. Henceforth, a counterplan against harmonic influences must be devised for more practical use of new substitute energy. In this paper, we studied the harmonic influences and new devices for that connections and defined the calculating methods for hamonic currents of those systems.

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A Study on the Regional Difference in Strawberry Farming Technology and its Causal Factors (딸기영농기술(營農技術)의 지역간(地域間) 차별성(差別性)과 영향요인(影響要因)에 관한 연구(硏究))

  • Kwon, Yong-Dae
    • Korean Journal of Agricultural Science
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    • v.22 no.2
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    • pp.231-243
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    • 1995
  • This paper aims to study regional difference in strawberry farming technology and its causal factors based on the survey of controlled strawberry farmers in three major strawberry cultivating regions, which are Nonsan county of Chungnam Province, Damyang County of Junnam Province and Guchang County of Kyungnam Province. There are differences in variety adoption, packaging and grading method which cause the farming income gap among these regions. Farmers of Guchang County, who adopt new variety Yeobong and packing system, raised highest gross receipts but ranked next to Damyang in terms of net income because of high packing cost. Farmers of Nonsan County earned lowest income because of poor quality and low price in spite of adopting packing cost saving method. Therefore, results of this study shows that successful farming technology depend on whether or not farmers adopt market oriented technology. It is suggested that direction of strawberry farming technology should focus on adopting new varieties which can contribute to increasing farmers' paid price and developing technology of reducing cost such as labor saving and packing machine.

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A Study on Song Soon's Myonang-jong and the Architectural Characteristics of Nujung of 16th Century (송순의 면앙정과 16세기 누정건축에 관한 연구)

  • Youn, Li-Ly
    • Journal of architectural history
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    • v.14 no.4 s.44
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    • pp.29-39
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    • 2005
  • The Honam region has played an important role in the development of Korea poetry. So this study focuses on Song Soon among various factors of Honam architecture in 16th century. He was ahead of his times in development of Korean literature, and made buildings that become background and materials of his literature. Song Soon built Myonang-jong in Damyang for his life time and tried to design to pull in nature into his buildings. These buildings were built in beautiful landscape, and showed elegance as a retired scholar and Taoism characteristics. He provided basic ideas, that is, pulling in nature into architecture, and metaphysics morality, and his ideas also influenced Honam School Including Jung Chul. This study looks into Nujung architecture that had become materials of Myonang-jong Song Soon literature and characteristics of Honam architecture through his buildings at the same time.

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Volatile organic compounds of pyroligneous liquor of bamboo sprout produced in damyang-gun (담양군 죽초액의 휘발성성분 분석)

  • Lee, Eunsil;Jang, Hyejin;Lee, Songjin;Ha, Jaeho
    • Analytical Science and Technology
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    • v.26 no.5
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    • pp.299-306
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    • 2013
  • Pyroligneous liquor as a byproduct from charcoal production of bamboo sprout produced damyang-gun has the broad benefits such as improvement of soil quality, plant growth control and is mainly used for the treatment of atopic dermatitis, fungi and many other skin diseases. In this study, flavor compounds of pyroligneous liquor from bamboo sprout produced in Damyang-gun were analyzed and compared using three different methods including direct analysis (DA), headspace solid phase microextraction (HS-SPME) and stir bar sorptive extraction (SBSE). Simultaneously, the analytical conditions of GC-MS for the determination of volatile compounds were optimized. Based on volatile organic compounds detected by GC-MS, SBSE and SPME methods showed higher sensitivity than direct analysis. Major compounds of pyroligneous liquor were cresol, guaiacol, p-ethyl guaiacol and syringol. These phenolic compounds are reported as the useful chemicals with medicinal activity.

The Flora of Vascular Plants in Mt. Chijae(Gamagol) and Its Adjacent Areas (in Damyang-gun, Jeonnam-do, Korea) (담양군 치재산(가마골) 일원 관속식물상)

  • Soon-Ho Shin;Kyoung-Pae Yun;Sang-Mi Kim;HyunSuk Kim
    • Korean Journal of Environment and Ecology
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    • v.38 no.1
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    • pp.22-47
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    • 2024
  • This study aims to reveal the distribution of native plants, rare plants, and specialty plants and provides basic data for efficient ecosystem management through a survey of the flora in Mt. Chijae (Gamagol) and its adjacent areas in Damyang-gun, Jeonnam-do, while also identifying useful plants in the eco-city Damyang-gun for distinctive garden plants. A total of 21 field surveys were conducted from March 2022 to June 2023 to collect and identify 492 taxa consisting of 101 families, 304 genera, 444 species, 10 subspecies, 35 varieties, and 3 formas. The analysis of the prepared sample list showed 14 taxa designated as specialty plants, 9 taxa designated as rare plants by the Korea Forest Service, 7 taxa designated as the national red (i.e., endangered) plants by the Ministry of Environment, and 68 taxa with phylogenetic specific species, of which 45 taxa for Grade I, 5 taxa for Grade II, 16 taxa for Grade III, and 2 taxa for Grade IV were confirmed. The list included 155 taxa of biological resources subject to export approval by the Ministry of Environment and 38 taxa of alien plants of which 7.7 percent were naturalized, and the urbanization index was 6.1 percent. Four taxa were ecosystem-disturbing invasive alien plants designated by the Ministry of Environment introduced artificially or naturally from abroad. This study is expected to contribute to creating unique and attractive landscapes in Damyang if the specific plants found in Mt. Chijae are grown and planted in city gardens.