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시계열 UAV 영상을 활용한 연안지역 침식·퇴적 변화 모니터링
조기성 ( Gi-sung Cho ),현재혁 ( Jae-hyeok Hyun ),이근상 ( Geun-sang Lee ) 한국지리정보학회 2020 한국지리정보학회지 Vol.23 No.2
In order to promote efficient coastal management, it is important to continuously monitor the characteristics of the terrain, which are changed by various factors. In this study, time series UAV images were taken of Gyeokpo beach. And the standard deviation of ±11㎝(X), ±10㎝(Y), and ±15㎝(Z) was obtained as a result of comparing with the VRS measurement performance for UAV position accuracy evaluation. Therefore, it was confirmed that the tolerance of the digital map work rule was satisfied. In addition, as a result of monitoring the erosion and sedimentation changes using the DSM(digital surface model) constructed through UAV images, an average of 0.01 m deposition occurred between June 2018 and December 2018, and in December 2018 and June 2019. It was analyzed that 0.03m of erosion occurred. Therefore, 0.02m of erosion occurred between June 2018 and June 2019. From the topographical change analysis results, the area of erosion and sediment height was analyzed, and the area of erosion and sedimentation was widely distributed in the ±0.5m section. If we continuously monitor the topographical changes in the coastal regions by using the 3D terrain modeling results using the time series UAV images presented in this study, we can support the coastal management tasks such as supplement or dredging of sand.
항운노무공급체계 개편에 따른 운영효과 분석에 관한 연구
조기성(Gi-Sung CHO),박진희(Jin-Hee PARK),김환성(Hwan-Seong KIM) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.추계
본 연구에서는 정부가 '항만노동 개혁'의 효과로 지적한 인건비 절감, 항만생산성 향상, 항운노조원의 근로조건향상, 대외신임도 향상 등의 효과들이 2007년 1월 상용화를 시작한 부산항 사례로 항만노무공급체계 개선 후 1여 년간의 실제 데이터를 바탕으로 그 효과를 고찰하고자 한다. In this paper, the efficiency of port operation after the decaualization of port labor in 2007 will be analyzed by case studying 4 pier in Busan port. As a main result of this study, firstly the productivity of container handling is increasing by transfer the vessel to other empty working area which managed same terminal operation company. Secondly the input number of port labor is reduced by efficient control of port labor. And the efficiency of the labor is increased and the labor cost is saved. Thirdly working conditions of port labor are guaranteed by job security, retirement, and coverage through four insurances. And it will be enhance the productivity of container handling. Lastly, the improvement method for terminal operation are suggested by modifying the working condition, automation of equipments, education of port labor, and increase of facilities in terminal.
SPOT 위성영상(衛星映像)을 이용(利用)한 3차원(次元) 위치결정(位置決定)의 정확도(正確度) 향상(向上)에 관(關)한 연구(硏究)
유복모,조기성,이현직,Yeu, Bock Mo,Cho, Gi Sung,Lee, Hyun Jik 대한토목학회 1991 대한토목학회논문집 Vol.11 No.4
본 연구에서는 자료형태 및 전처리수준이 다른 위성영상자료를 이용하여 전처리수준에 따른 외부표정요소의 최적다항식형태와 위치결정정확도를 파악하고, 지상기준점의 획득방법 및 획득방법에 따른 3차원 위치결정정확도를 분석함으로서 SPOT 위성영상을 이용한 3차원 위치결정이론 및 프로그램을 개발하고 위치결정의 정확도를 향상시키는데 목적이 있다. 본 연구수행 결과 각 전처리수준에 대한 외부표정요소의 최적다항식형태(수준 1B; 15변수, 수준 1AP, 1A; 12변수)를 결정할 수 있었으며, 전처리수준에 따른 위치결정 정확도분석에서는 수준 1AP 위성사진의 정확도가 가장 좋았으나, 수치영상인 수준 1A도 유사한 정확도를 나타냄을 알 수 있었다. 또한, 지상기준점의 획득방법이 다른 수준 1A 수치영상의 3차원 위치결정 정확도를 분석한 결과, 지상기준점의 정확도가 양호한 경우 부가매개변수의 도입만으로 정확도 향상률이 큰 반면 지상기준점의 정확도가 저하되는 경우 부가매개변수의 도입만으로 정확도가 크게 향상되지 않아 조정체계에 과대오차소거이론이 포함된 동시조정이론을 적용함이 바람직함을 알 수 있었다. This study aims to improve the positioning accuracy by analizing the accuracys of three dimensional positioning according to various data types and preprocessing levels of SPOT imagery and the acquisition method for ground control points, and to develop the three dimensional positioning algorithm and program. In this study, the optimum polynomials of exterior orientation parameters according to each preprocessing levels (level 1B; 15 variables, level 1AP, 1A; 12 variables) are determined. As a results, the accuracy of level lAP is the best in the results of analysis about the accuracy of positioning, but level 1A which is digital image data form also shows similar positioning accuracy. Also, in level 1A image which have different acquisition method for ground control points, the accuracy of three dimensional positioning is highly improved. But, in case of low accuracy of ground control points, only introduction of additional parameters does not effect to the improvement of accuracy. Therefore simultaneous adjustment including blunder detection method should be adopted.