• 한국전자통신학회논문지
• /
• 제6권5호
• /
• pp.603-610
• /
• 2011

여수지역에는 옛날부터 통신관련 역사유적과 유물이 봉수대, 솟대, 등대, 거문도 최초 해저케이블 설치 등으로 통신의 역사적 가치가 존재했었다. 옛 고문서에 나타나 있는 이지역의 통신 역사성을 확인하여 통신에 의한 여수지역의 발달을 이해하고 통신역사성의 자원을 확인할 필요가 있다.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 1990년도 춘계 학술대회지
• /
• pp.24-25
• /
• 1990

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 1990년도 춘계 학술대회지
• /
• pp.26-27
• /
• 1990

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 1990년도 춘계 학술대회지
• /
• pp.28-29
• /
• 1990

• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 1999년도 정기총회 및 춘계 학술발표회
• /
• pp.40.1-40
• /
• 1999

• Journal of Plant Biology
• /
• 제14권3호
• /
• pp.36-42
• /
• 1971

The effects of irregular burning of vegetation by man were studied in relation to composition and productivity in a non-agricultural montane grassland in the Chongsun area, Kangwon-Do, Korea. The floristic composition in all study area includes 38 species. Three of the stations are dominated by Arundinella hirta and one is dominated by Miscanthus sinensis. The standing crop of the first station, which was fired in early spring, 1970, was 358.7g/$m^2$ to 497.5g/$m^2$; that of the second station, fired in late 1969 was 351. 5g/$m^2$; the third station, fired sometime in 1968, had a standing crop of 314.5g/$m^2$ to 397.1/$m^2$; the fourth station, having had no recent fires, had a standing crop of 370.0g/$m^2$ to 448.0g/$m^2$. The daily productivity shows a maximum of 6.03g/$m^2$ in the first station, and a minimum of 0.85g/$m^2$ in the fourth station. The productivity of grassland in the study area is at a maximum during July and August because of much precipitation, and decreases rapidly in the months to follow. The productive structure of the first and fourth stations is shown in Fig. 2 and 3. At the first station the maximum height attained by the plants was 180cm. In the height range of 50cm to 100cm there was a maximum of assimilative organs (5.6g/0.25$m^2$$\times$10cm), while in the height range below 50cm there was a maximum of non-assimilative organs (13.0g/0.25$m^2$$\times$10cm). At the fourth station, which has not been fired recently, the maximum height reached by the plants was commonly below 100cm. The assimilative organs showed a maximum abundance in the height range of 40cm to 50cm (4.5g/0.25$m^2$$\times$10cm). while the non-assimilative organs showed their greated abundance in the height range below 10cm (6.0g/0.25$m^2$$\times$10cm). There was a direct relationship between daily productivity and organic matter, available phosphorous, exchangeable calcium and potassium. It appears that the nutrients provided by the ash created in the firing of the study can be an important factor in the productivity of these grasslands.

• 한국음향학회지
• /
• 제14권3호
• /
• pp.105-113
• /
• 1995

우리나라의 제 1 이동통신에서 현재 사용중인 아나로그 FM 시스템이 이동통신 자율표준으로 채택된 CDMA 시스템과 혼용되는 경우, 두 시스템 사이에서 발생하는 상호간섭의 정도를 실험을 통하여 분석하므로ㅆ 주파수 효율을 향상시키기 위한 최적 주파수 이격거리를 구하였다. 분석결과 CDMA 기지국 출력이 0.91 W ERP일 때, 경로손실에 따른 아나로그 FM 이동국과의 주파수 이격거리는 840KHz(경로손실 : 80dB)와 720KHz(경로손실 : 120dB)였다. 즉, 주파수 이격거리는 경로손실에 반비례하였다. 한편 주파수 이격거리를 최소화하기 위해서는 기지국의 출력을 Cover Area에 대응시켜 조절해야 함을 알았다.

• 원예과학기술지
• /
• 제17권5호
• /
• pp.569-571
• /
• 1999

백침계 오이 '샤프 1호'의 9월 파종 재배시 저온기(11월~익년 2월)에 다수확할 수 있는 정지방법을 구명코자 2개년간('98~'99)에 걸쳐 시험한 결과, $m^2$당 마디수, 엽면적, 수관 상부의 엽면적 분포비율 및 근중 등은 측지재배구가 가장 많았고, 주지+측지재배구, 주지재배구 순이었다. 총수량 및 상품과(商品果) 수량도 같은 경향 이었다. 유인작업에 소요되는 노동력은 측지재배구가 가장 적었고, 주지재배, 주지+측지재배구 순으로 많았다.

• 한국환경과학회지
• /
• 제18권9호
• /
• pp.941-952
• /
• 2009

The urban microscale wind field around the air quality monitoring station was investigated in order to check how a building complex influences it. For this study as the high density areas Jwa-dong and Yeonsan-dong monitoring sites in Busan were chosen. As the direction of inflow which is perpendicular to the building of the monitoring station was expected to cause the considerable variation of the wind field, that direction was selected. The model Envi-met was used as the diagnostic numerical model for this study. It is suitable for this investigation because Envi-met has the microscale resolution. After simulating it, on the leeward side around a building complex the decrease of flow velocity and some of vortexes or circulation area were discovered. In addition, on the edge of the top at the building and at the back of the building the upward flow was developed. If the sampling hole of monitoring site were located in this upward flow, it would be under the influence of upward flow from the near street.

• Journal of Positioning, Navigation, and Timing
• /
• 제3권2호
• /
• pp.83-90
• /
• 2014

In this study, to improve an existing ground-wave based time broadcasting system, a study that predicts the field distribution and field strength of the transmitted signal of a new ground-wave based time broadcasting system was performed. The prediction area was assumed to be the Korean peninsula; and to reflect the mountainous terrain of the Korean peninsula in the prediction of the variations of field distribution and field strength, a new prediction method based on the Monteath model was proposed and utilized. As field distribution changes depending on the position of a transmitter station, potential sites for the transmitter station were selected considering the geographical characteristics. In this regard, the ground conductivity information of North Korea cannot be obtained, and thus, the ground conductivity of the North Korean region was reflected considering the geological characteristics of South Korea and North Korea. Based on this, the variations of field distribution and field strength were predicted by setting the Korean peninsula as the prediction area, and the prediction results depending on the position of the transmitter station were discussed.