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수치모델을 이용한 제주도 무릉리 주변해역의 조류 및 온배수확산특성
이병걸,양성기,방익찬 제주대학교 해양연구소 1996 해양자원연구소연구보고 Vol.20 No.-
The numerical models based on the shallow water wave equation and the diffusion equation were applied to the coastal mne of Murung-ri, Cheju Island to find out tidal current and thermal diffusion pheno-mena Computed maximun tidal current velocity during ebb and flood tide was almost 100 cm/sec and main directions of tidal current were South-East in flood and North-West in ebb tide, that was similar to the observation one. The thermal diffusion length of horizontal and verical directions from coastal zone were 3 km and 1 km. repectively during 1 tidal cycle based on numerical diffusion model. The diffusion pattern during tidal cycle was strongly related to tidal current velocity patterns.
이병걸 한국지구과학회 2018 한국지구과학회지 Vol.39 No.1
This paper is to study the development of three dimensional Digital Surface Model (DSM) using photogrammetry technique based on self-developed Drone (Unmanned Aerial Vehicle (UAV)). To develop DSM, we selected a study area in Jeju island and took 24 pictures from the drone. The three dimensional coordinates of the photos were made by Differential Global Positioning System (DGPS) surveying with 10 ground control points (GCP). From the calculated three dimensional coordinates, we produced orthographic image and DSM. The accuracy of DSM was calculated using three GCPs. The average accuracy of X and Y was from 8.8 to 14.7 cm, and the accuracy of Z was 0.8 to 12.4 cm. The accuracy was less than the reference accuracy of 1/1,000 digital map provided by National Geographic Information Institute (NGII). From the results, we found that the self-developed drone and the photogrammetry technique are a useful tool to make DSM and digital map of Jeju. 이 논문은 자체 개발된 드론을 이용하여 사진측량기술을 적용하여 3차원 수치지표면모델(DSM)개발 연구를 수행하였다. 이 DSM을 개발하기 위하여 제주도 지역을 선정하여 24장의 사진을 개발된 드론으로 직접 촬영을 수행하였다. 촬영된 사진의 정확한 3차원 좌표를 부여하기 위하여, 10개의 지표기준점(GCP)점을 선정하여 상대측위 지구위치시스템(DGPS)측량을 실시하였다. 사진의 정확도를 평가하기 위하여 3개의 GCP점을 선정하여 사진상의 좌표와 지상점의좌표의 정확도를 비교하였다. 사진좌표계과 지상좌표계의 정확도를 평가한 결과 수평오차는 8.8-14.7 cm로 나타났으며, 연직오차는 12.4 cm로 나타났다. 이 정확도는 국토지리정보원(NGII)이 인정하는 1/1,000 수치지도의 정확도를 가지는측량결과이다. 이 연구를 통하여 본 연구에서 개발된 드론과 사진측량기법이 제주지역에서 우리가 원하는 DSM자료를얻는데 유용한 기술임을 알 수 있었다.
이병걸,최영찬 濟州大學校 海洋硏究所 2004 해양과환경연구소 연구논문집 Vol.28 No.1
To find out the horizontal and the vertical temperature structures and the current characteristics of coastal ocean around Jeju Power Plant located at north part of Jeju Island, we observed the seawater temperature in March, May, September and December, in 2003 and also 15 days long times waves using a current meter respectively. The observed results show that the seasonal variations of the horizontal and vertical temperature pattern happened. However, the horizontal temperature distribution pattern was not much changed. It means that the horizontal temperature change was not so strong due to tidal mixing effects in coastal area. So that the density current was so weak by the weak stratification effects. The surface current pattern shows that the M₂ tidal current component was relatively strong compared with K₂, K₁, 0₁ and constant flow. From the observation results, we found that the density current around Jeju Power Plant was very weak but the surface current was strong since the tidal current effects.
버전 관리 시스템에 기반한 비동기적 협동저작도구 개발 모델
이병걸,승현우 서울여자대학교 자연과학연구소 1999 자연과학연구논문집 Vol.11 No.-
기존의 협동저작도구 개발은 주로 실시간 또는 동기시간 협동구조에 근간을 두고 있다. 하지만 다양한 협동저작 환경 및 네트워크 전송속도의 한계로 인해 비 동기시간 협동저작도구의 중요성이 점차 증대되어지고 있다. 비 동기시간 협동저작도구의 개발을 위하여 버진제어 기능의 도입이 제안되고 있는데, 기존의 버전제어 기능으로는 다양한 사용자들의 집단작업환경 및 요구들을 충족할 수 없다. 본 연구에서는 이를 효과적으로 지원하기 위한 새로운 버전관리 모델을 제시한다. 특히 기존의 버전관리 도구들에 문제가 되어왔던 버전 충돌 인지 및 버전 병합 기능, 그룹 구성 및 접근 제어 기능, 그룹 인지 기능 등을 보완하기 위하여 AID(Activity Identification) 모델을 제시하고 그 구현방법을 설명한다. 제안된 AID 시스템은 유일주소 지정기법을 사용함으로써 협동작업 환경 하에서의 다양한 버전간의 충돌 인지 및 병합을 용이하게 하고, 접근권한 테이블과 역할부여 기능을 AID 태그와 연계함으로써 역할 및 크게인 크기에 따른 문서 공유가 가능하도록 하였다.
The Land Surface Temperature Distributions of Jeju Island using Landsat 7/ETM+ Data
이병걸 한국지구과학회 2005 韓國地球科學會誌 Vol.26 No.2
In this study, the estimation of the temperature distribution of Jeju Island with coastal ocean derived from thethermal band of Landsat 7/ETM+ of January 6, 203 was caried out. For the computation of the temperature of theisland and the coastal ocean based on the thermal band, we used NASA method which is the 8 bit Digital Number (DN)converted into spectral radiance. The computed results showed that the land temperature variations were from 0 to 12temperature was not much changed around 15 degree since the water was well mixed between the coastal and theoffshore ocean. The interesting results were that the temperature distributions of the southern part (Seogwipo City) of JejuIsland were higher than those of the north one (Jeju City) by more than 2 Celsius degree at the same height although thedistance between the Jeju and the Seogwipo is only about 35 km in winter season. The reason was found that the solarresults, we found that the seasonal variations of solar irradiation and the height of Mt. Halla were an important role oftemperature distribution of Jeju Island