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RISS 인기검색어
- 검색키워드
- 저자 : 鄭東璨(JEONG Dong-chan) (검색결과 6 건)
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정동찬,Jeong, Dong-Chan 한국과학기술단체총연합회 1999 과학과 기술 Vol.32 No.7
인류가 처음 이 땅에 나타난 구석기시대엔 '동굴'에서 살다가 불을 발견하면서 '막집'을 짓고 살았으며 청동기 철기시대에는 '움집'을 짓고 살아왔다. 이때부터 우리 선조들의 집짓기 문화는 비약적으로 발달하여 집이 지상으로 올라오고 '초가집'과 '기와집'이 등장하게 된다. 터를 닦고 기둥세우기, 문의 구조, 구들과 마루, 지붕의 곡선과 서까래 등을 살펴보면 자연의 섭리를 따르는 환경보전정신과 과학기술이 응어리져 있음을 발견하게 된다.
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鄭東璨(JEONG Dong-chan),尹用賢(YUN Yong-hyun),李康烈(LEE Gang-ryeol),金容萬(토론자) 고구려발해학회 2004 고구려발해연구 Vol.17 No.-
From our country the cart is initially confirmed from Nitan Formation of Jueuiri about 7th~8th century before era and has really been used on the Iron Age. 40 carts and 4 cart wheels has strikingly shown from 18 ancient tombs among 95 ancient mural tombs of Koguryo. The ancient tombs which have cart in ancient mural tomb are Yaksuri ancient tomb, Anak 1 ancient tomb, Anak 3 ancient tomb, Duckheungri ancient tomb, Muyong tomb, Ssangyeong tomb, Ohoebun 4 ancient tomb, Ohoebun 5 ancient tomb, Jangcheon 1 ancient tomb, Susanri ancient tomb, Yeogjeon tomb of Pyeongyang, Taeseongri 1 ancient tomb, Palcheongri ancient tomb, Gosandong 7 ancient tomb, Gamsin tomb, Gakjeo tomb, Daeanri 1 ancient tomb, and Tonggu 12 ancient tomb. The cattle and horse drew the cart in Koguryo. The horse had used for quick moving for hunting and warfare, and the cattle for drawing the cart. The nobility used horse and cart for going out, and the women used the cart. The major uses of the cart are; 1) to transport person. The cart of the ancient mural tomb of Koguryo. corresponds to here. 2) to carry burden. This kind of cart is visible in Muyong tomb and Gakjeo tomb. 3) for weapon as an applied cart, such as Chungja, Unje, Pocha. The size of the Koguryo's cart can be presumed by the size of the people which are visible in the ancient mural tomb. The mean height of the Koguryo's people can be estimated by the height of Yeanri's people of Gaya and the picture of a cattle drover in ancient mural tomb of Koguryo. The cart for male has an open-room and been pulled by cattle (Anak 3 unit) or horse (Duckheungri). The open-cart of Anak 3 has a sunshade to be high. People can see the left and right sides when they are seated on the chair. The bending chair has been set on a cartwheel and has tree plank on chair back. The cart of Duckheungri has round flower-shaped umbrella in the roof. In the case of the female cart, the palanquin which has roof on top and curtains on left and right sides has been set on cartwheel. The size of the palanquin is similar to cartwheel. The can for carrying burden such as shown in Muyong tomb has larger cartwheel (151.5㎝) than that of cart for transporting people, and has closed-room. After 5th century the Koguryo. used closed-room cart for foreign trades. The Koguryo. exported Iron and Gold to Silwi which is situated on the Hwun river. Because the Iron is heavy, trading Iron means the development of transportation tools. Koguryo, uses the cart for trading and expands its influence on me neighbor countries, and finally developed as ancient nation for the first time. It was possible by the cart-making technique and engineering technique related with road and bridge construction.
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30 MHz에서 1 GHz 대역 EMI 측정용 다이폴안테나 교정의 측정 불확도
박정규,정동찬,조진영,Park, Jung-Kuy,Jeong, Dong-Chan,Cho, Jin-Young 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.2
측정 분야나 교정 분야에서 측정 불확도를 보고하는 것은 매우 중요하다. 정보통신부 전파연구소에서는 EMI 측정 시험소를 위하여 안테나 교정 서비스를 제공하고 있는데, 안테나 교정의 정확성은 측정 불확도 평가로 집약되어, EMI 시험의 신뢰성을 판가름하는 시금석이 된다. EMI에 관한 국제기구인 CISPR에서는 2005년 말에 안테나 교정에 대한 최초의 표준 초안인 CISPR/A/644/C를 내놓았다. 이 초안은 안테나교정 및 관련된 측정 불확도를 포함하고 있다. 본 논문에서는 이 문서를 근간으로 전파연구소 이천의 안테나 교정시험장에서 EMI용 다이폴안테나를 교정할 때의 측정 불확도를 산출하였다. 전파연구소의 안테나 교정 방법은 자유 공간 안테나 인자를 측정하는 3-안테나의 height scanning averaging 법으로서, 본 방법에 의하여 안테나가 교정될 때 측정 결과에 영향을 미칠 수 있는 모든 불확도 요인을 고려하였다. Measurement uncertainty assessment is very important in measurement and calibration. RRL provides antenna calibration services for EMI test. Reliability of EMI test depends on accurate antenna calibration. Antenna calibration results have to be accompanied with measurement uncertainty for its better reliability. In the late of 2005, CISPR issued the CISPR/A/644/C which describes the antenna calibration and measurement uncertainty. In this paper, on the basis of CISPR/A/644/C, we provide the measurement uncertainty values for dipole antenna calibration at the Calibration Test Site(CALTS) of Icheon. The antenna calibration method is 3-antenna height-scanning-averaging method, which measures the free-space antenna factor. We also considered all uncertainty sources that can affect measurement results during calibration.
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