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Sentinel-1 시계열 SAR 간섭기법을 활용한 영일만항과 주변 지역의2017 포항 지진 동시성 및 지진 후 변위 분석
이시웅,김태욱,한향선,김진우,전영범,김종건,이승철 대한원격탐사학회 2024 大韓遠隔探査學會誌 Vol.40 No.1
Ports are vital social infrastructures that significantly influence both people’s lives and a country’seconomy. In South Korea, the aging of port infrastructure combined with the increased frequency of variousnatural disasters underscores the necessity of displacement monitoring for safety management of the port. In this study, the time-series displacements of Yeongilman Port and surrounding areas in Pohang, SouthKorea, were measured by applying Permanent Scatterer Interferometric Synthetic Aperture Radar(PSInSAR) to Sentinel-1 SAR images collected from the satellite’s ascending (February 2017–July 2023)and descending (February 2017–December 2021) nodes, and the displacement associated with the 2017Pohang earthquake in the port was analyzed. The southern (except the southernmost) and central partsof Yeongilman Port showed large displacements attributed to construction activities for about 10 monthsat the beginning of the observation period, and the coseismic displacement caused by the Pohangearthquake was up to 1.6 cm of the westward horizontal motion and 0.5 cm of subsidence. However, littlecoseismic displacement was observed in the southernmost part of the port, where reclamation wascompleted last, and in the northern part of the oldest port. This represents that the weaker the consolidationof the reclaimed soil in the port, the more vulnerable it is to earthquakes, and that if the soil is very weaklyconsolidated due to ongoing reclamation, it would not be significantly affected by earthquakes. Summer subsidence and winter uplift of about 1 cm have been repeatedly observed every year in the entire area ofYeongilman Port, which is attributed to volume changes in the reclaimed soil due to temperature changes. The ground of the 1st and 2nd General Industrial Complexes adjacent to Yeongilman Port subsided duringthe observation period, and the rate of subsidence was faster in the 1st Industrial Complex. The 1stIndustrial Complex was observed to have a westward horizontal displacement of 3 mm and a subsidenceof 6 mm as the coseismic displacement of the Pohang earthquake, while the 2nd Industrial Complex wasanalyzed to have been little affected by the earthquake. The results of this study allowed us to identify thetime-series displacement characteristics of Yeongilman Port and understand the impact of earthquakeson the stability of a port built by coastal reclamation.
覆土住宅의 暖房에너지 및 溫熱環境에 관한 測定 硏究 : 冬季 모델 住宅을 中心으로 Focusing on the Medel Earth Bermed House in Winter
李時雄 大田開放大學 1986 論文集 Vol.5 No.-
The purpose of this paper is to research the performance of the thermal environment and energy in a case of the earth bermed House designed to be suitable for Korean situation in comparison with a convent onal housing. The result of this study can be summerized as follows; 1) Heating energy of the earth bermed house is saved 40.1% than that of the conventional housing in Korea. 2) The time-lag of the earth helmed house is 57 minutes longer than that of a conventional housing on account of the thermal capacity, so the earth bermed house has much more satisfactory thermostatic mitigation effect rather than the conventional housing. 3) The thermal environment of the earth bermed house in winter is proved to be more comfortable than that of a conventional housing according to the Yaglou's comfort zone.
동적 프로그래밍에 기반한 윤곽선 근사화를 위한 정점 선택 방법
이시웅,최재각,남재열 대한전자공학회 2004 電子工學會論文誌-SP (Signal processing) Vol.41 No.03
This paper presents a new vertex selection scheme for shape approximation. In the proposed method, final vertex points are determined by "two-step procedure". In the first step, initial vertices are simply selected on the contour, which constitute a subset of the original contour, using conventional methods such as an iterated refinement method (IRM) or a progressive vertex selection (PVS) method. In the second step, a vertex adjustment process is incorporated to generate final vertices which are no more confined to the contour and optimal in the view of the given distortion measure. For the optimality of the final vertices, the dynamic programming (DP)-based solution for the adjustment of vertices is proposed. There are two main contributions of this work. First, we show that DP can be successfully applied to vertex adjustment. Second, by using DP, the global optimality in the vertex selection can be achieved without iterative processes. Experimental results are presented to show the superiority of our method over the traditional methods. 본 논문은 다각형 기반 윤곽선 근사화를 위한 새로운 정점 선택 방법을 제안한다. 제안된 방법은 초기 정점 선택 단계와 정점 조절 단계로 구성된다. 먼저 기존의 순환적인 정점 선택 기법(Iterative Refinement Method: IRM) 또는 순차적인 정점 선택 기법(Progressive Vertex Selection: PVS)을 사용하여 초기 정점이 윤곽선상에 놓이도록 초기 정점을 선택한다. 이렇게 선택된 초기 정점은 원 윤곽선의 부분 집합을 구성하게 된다. 두번째 단계에서 정점 조절 과정을 수행하게 되는데, 최종 정점의 위치를 윤곽선상으로 국한하지 않고, 주어진 왜곡 척도하에서 최적인 정점들을 얻는다. 이때 전역적인 관점에서 최적인 최종 정점들을 얻기 위하여 동적 프로그래밍을 사용한다. 제안된 방법은 동적 프로그래밍을 사용함으로써 반복적인 과정없이 전역적 관점에서 최적인 정점들을 선택할 수 있다. 실험결과, 제안된 방법이 기존의 방법들보다 우수한 성능을 나타내었다.