• Title/Summary/Keyword: Suncheon

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Sensorless Vector Control for Maximum Torque of SynRM in the Field Weakening Region (약계자 영역에서 SynRM의 최대 토크제어를 위한 센서리스 벡터제어)

  • Lee, Jung-Chul;Chung, Dong-Hwa
    • Journal of the Korean Society of Safety
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    • v.17 no.2
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    • pp.32-38
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    • 2002
  • In this paper, a new approach for the SynRM(Synchronous Reluctance Motor) control which ensures producing MTPA(Maximum Torque per Ampere) over the entire field weakening region is presented. In addition, this paper presents a speed sensorless control scheme of SynRM using flux observer. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The validity of the proposed scheme is verified through simulation.

Landscape Planning and Design for Education Culture Center on Revealing Locality, Suncheon (지역 정체성 구현을 위한 순천 교육문화 공간 조경계획)

  • Jeong, Yeong-Jin;Jeong, Wook-Ju
    • Journal of Korean Society of Rural Planning
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    • v.15 no.2
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    • pp.9-17
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    • 2009
  • The purpose of this study is to discuss issues on how locality can be revealed through landscape planning and design especially in the local environment. Over the past decade, there has been substantial increase in architects and landscape architects working internationally. There are many that believe this may lead to a unifying global brand of design that overlooks the identity and specificity of place. This lead us to think opportunities and challenges for designers working internationally to understand and create a unique sense of place. Relations between contemporary design trend and local identity will be studied through case studies. Design strategies and languages on revealing locality will be also discussed with the Suncheon Education Culture Center project.

Effect of Drying Agents and Ethyl Alcohol on Change of Flower Color of Gentian (Gentiana uchiyamai) in Pressed Flower

  • Song, Won-Seob;Kim, Young-Sun
    • Plant Resources
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    • v.5 no.2
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    • pp.124-140
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    • 2002
  • The effects of drying agents and ethyl alcohol treatment on the flower color of Gentiana uchiyamai. The flower color was not much changed in flower sheet, in the case of absorbtion papers only. The color was least changed in Korean and China hwasunjis, in the case of absorbtion papers and silica gel treatment. The color was less changed in flower sheets, window papers, and China hwasunjis, and was most changed in newspapers, in the case of absorbtion papers and Na$_2$SO$_4$ treatment. The color was least changed in China hwasunjis, and most changed in dampened papers, in the case of absorbtion papers and CaO treatment. The color tended to change far from the original one, as treatment time got longer, in the case of 0.01M and 0.lM of tartaric acid. The longer the treatment time and the bigger the concentration of ethyl alcohol, the bigger flower color.

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Determination of Organophosphorous Pesticides in Suncheon Bay (순천만 유기인제제 농약의 측정)

  • JEON, DEOK SAN;YANG, JAE SAM
    • 한국해양학회지
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    • v.25 no.1
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    • pp.21-25
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    • 1990
  • Eleven water samples were analyzed for organophosphorous pesticides in Suncheon Bay with Gas Chromatography Mass Spectrometry. For the first time in Korea, Kitazin-P was found in marine environment and the concentrations ranged upto 2.2mg/l. The regional and temporal variations of the pesticide were also studied.

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Native Environment and Growth Characteristics of Dendropanax morbifera Lev. In Korea

  • Park, Seong-Kyu;Park, Kyong-Ju;Lee, Jong il
    • Korean Journal of Plant Resources
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    • v.10 no.3
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    • pp.271-273
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    • 1997
  • This study was carried out to obtain basic envirinmental information of the native area and growth characteristics at different age of Dendropanax morbifera LEV. In the southern Korea. The Dendropanax morbifera LEV. Was grown naturally at Wando, Cheju(Mt. Halla), Yecheon(Kermoon island),Sinan(Hong isand), Jindo(Mt. Chermchill) and Haenam(Mt. Taeroon), all between 30 to 450m above the sea level. The soil characterisitics of the native area had a pH of 5.3 to 5.4 with 8.4 to 9.8% content of organic matter and 18.2 to 21.3% soil moisture. Flowering starting in the middle of July begun when the trees were 6 years old. Six year old trees are 129 cm in stem height, 34 mm in stem diameter,15.4 in number of leaves with petioles 12.9 cm long. Xylem sap can be obtained from over 10 year old trees that grew well and have over 10 cm stems in diameter.

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