• Title/Summary/Keyword: Do Cheong

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기후변화에 따른 NSR 현황과 전망

  • Nam, Cheong-Do
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.06a
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    • pp.8-10
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    • 2014
  • 정부의 북극항로 시험운항이 시행된 2013년 NSR횡단 선박 척수는 전년도에 비해 54%가 늘어난 71척에 이르렀으나 실제 화물수송량은 당초 예상량인 150만톤에도 못 미치는 1,355,897톤으로 전년도에 비해 7.5% 증가에 그치고 말았다. 이는 2013년 하절기 북극해의 얼음이 2012년도에 비해 훨씬 적게 녹았기 때문으로 분석되고 있다. 그러나 지구온난화로 인한 전체적인 해빙 크기의 감소추세는 큰 틀에서 벗어나지 않고 있으므로 NSR의 선점을 위해서는 화물의 경제성 평가와 더불어 고효율선의 운항에 대비할 필요가 있다.

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A Study on Speed Control of Three-Phase Induction Motor Based on The Reduced Order Observer Theory (최소차수 옵서버 이론을 이용한 3상 유도전동기의 속도제어에 관한 연구)

  • Yoon, Byung-Do;Cheong, Dal-Ho
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.294-297
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    • 1988
  • THIS PAPER IS PROPOSED A NOVEL FLUX OBSERVER BASED ON GOPINATH REDUCED ORDER OBSERVER FOR VECTOR CONTROL OF INDUCTION MOTOR. WE SUGGEST RESULT OF SIMULATION ON THE PAPER. WE WILL CONSTRUCT FLUX VECTOR FEEDBACK CONTROL TYPE FOR INDUCTION MOTOR USING FULX OBSERVER.

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북극해 시대 부산의 기회와 대응방안에 관한 연구

  • Ryu, Dong-Geun;Nam, Cheong-Do;Nam, Hyeong-Sik
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.10a
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    • pp.8-10
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    • 2013
  • 북극항로의 개발은 국제운송 및 관련산업에 많은 영향을 미칠 전망이다. 본 연구에서는 북극해 시대가 부산지역 및 부산항에 어떤 영향을 미칠 것인지에 대해 분석하고 대응방안을 제시하고자 한다.

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북극항로는 새로운 해양실크로드가 될 것인가?

  • Nam, Cheong-Do;Lee, Dong-Seop
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.10a
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    • pp.154-156
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    • 2014
  • 지구온난화로 2000년대 초부터 급격하게 감소하던 북극의 해빙이 2012년 이후로 다소 주춤한 상태로 돌아서고 있다. 그러나 최근 북극항로를 이용하는 선박의 척수와 화물량은 꾸준히 증가하고 있어 이 항로에 대한 세계적인 관심이 집중되고 있다. 중세의 문명의 교류가 오아시스 루트와 초원 루트 그리고 말라카 해협을 통한 해상실크로드를 통해 이루어진 것처럼, 장차 아시아와 유럽을 잇는 북극항로가 신해양실크로드가 될 것인지 북극을 둘러싼 여러 가지 상황을 살펴보고자 한다.

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Pathogenicity and Host Range of Pathogen Causing Black Raspberry (Rubus coreanus) Anthracnose in Korea (복분자딸기 탄저병균의 병원성과 기주범위)

  • Jeong, Uh Seong;Kim, Ju Hee;Lee, Ki Kwon;Cheong, Seong Soo;Lee, Wang Hyu
    • Research in Plant Disease
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    • v.19 no.2
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    • pp.121-123
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    • 2013
  • The strains of Colletotrichum gloeosporioides, C. coccodes, C. acutatum isolated from black raspberry were pathogenic to apple and strawberry after dropping inoculation, but showed weak pathogenicity in hot-pepper and tomato. The anthracnose pathogens of C. gloeosporioides, C. orbiculare, C. acutatum isolated from apple, hot-pepper and pumpkin showed pathogenicity in black raspberry. Moreover, the anthracnose pathogens isolated from apple caused disease symptoms in non-wounded inoculation.

A Study on the Evaluation of Pollution Characteristics of Sincheon Stream and Its Tributaries in Gyeonggi-do Province (경기도 신천 및 유입지천의 오염특성 평가)

  • Son, Yeong-Geum;Im, Heung-Bin;Lee, Kang-Hyuck;Kim, Jin-Guil;Im, Yun-Jung;Choi, Jeong-In;Lee, Ho-Jung;Oh, Jo-Gyo
    • Journal of Environmental Health Sciences
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    • v.43 no.5
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    • pp.422-430
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    • 2017
  • he objective of this study is to evaluate and analyze Sincheon basin water environment system. The data were collected from 2010 August to 2016 December including BOD, SS, T-N, T-P. The results were as followed. As the result of comparing the amount of BOD generated by pollution sources in the Sincheon water system, industrial was the highest at 33,259.4 kg/day. In comparison with the tributary, it was estimated that Dong-Du water system reveals the highest level of BOD in the industry. Population and livestock was high in CheongDam and Sang-Pae water system. With the inflow stream of Hyo-Chon, Suk-Woo and Sang-Pae, the pollution degree of BOD and T-N level of Sincheon increased and pollution degree of tributary was higher than that of Sincheon's main stream. The main reason of pollutant of Suk-Woo was from untreated wastewater, and it influenced downstream of Suk-Woo. Hyo-Chon stream satisfy the water quality standard, but Zn was designated as a Monitoring contaminants, was high as 14.670 mg/L (standard 0.02~2.45mg/L)because of textile wastewater. And Sang-Pae stream was polluted by livestock wastewater of livestock farms as a nonpoint source.

The Spider Fauna of Chun Cheon area, Kangweon do, Korea (춘천지방의 거미상)

  • Namkung Joon;Paik Namkeuk
    • Korean journal of applied entomology
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    • v.12 no.3
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    • pp.131-137
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    • 1973
  • This paper is given for the first time as a list of spiders from Chuncheon area, in land of kang-weon-do, mid-eastern part of Korea. Materials were collected during the early August 1972 by the Biological members of the chuncheon girl's high school, in chuncheon area. In addition to this materials collected by paik and Nam kung during July 1973 at Mt. Sam-ak which is located on south-west of chuncheon were examined. 1) In this paper, tile authors record 105 species of spiders belonging to 22 families, including 4 undetermined species from chuncheon area. 2) The followings are newly added to the spider fauna in Korea. a) Curstulina sp. b) Zelotes asiaticus(BOES. et STR.) 3) These materials are not sufficient for general discussion of the spider fauna of chuncheon area, however, an outline can be summarized as follow: 21 northern species $(20.8\%)$ 5 southern species $(5.0\%)$ 3 cosmopolitan species $(3.0\%)$ 72 plaearctic species $(71.2\%)$

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