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남광우 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.S2 No.1
The necessity for measurement of population potentials change in urban space arises from need of urban planners and decision-makers who want to know how the population distribution has been changed to solve many urban affairs caused by spatial structure and to measure socioeconomic cost of urban development and management. In order to deal with these essential questions, this study focused on population potential of each node on the roads in Manassas City in Virginia State, U.S. from 1990 to 2000. Korean Census data is very limited in the practical use in spite of massiveness of scale because of big aggregation unit. In this study, Negative exponential function have been used to analyze a spatial redistribution process and they have been formulated in Network GIS environments. In this study, population distribution was defined as the results of interaction among components in the urban space and the potentials for interaction in the future. So, this study dealt with population distribution pattern as morphologic construction. In addition, population surface modeling with GIS was used to analyze the spatial variation. Through the results of the empirical analysis of population redistribution pattern, we can know the change of population potentials pattern with specific accessibility index of each nodes.
강선영 ( Seon-young Kang ),박배선 ( Bae-seon Park ),이학태 ( Hak-tae Lee ) 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.1
공항 내에서의 효율적인 지상 교통 관리를 위하여 선입-선처리 (FCFS; first-come first-served) 알고리즘을 적용한 항공기 지상이동 스케줄러를 개발하였다. 본 스케줄러는 이전에 개발한 공역 내 교통 흐름 관리 스케줄러를 기반으로 하며, 지상 이동에 있어 추가적으로 요구되는 제약 조건인 링크의 방향성과 교차로 처리 등을 추가하였다. 추가된 각각의 제약 조건을 만족하는지 검증하기 위해 단순한 시나리오를 제작하여 시뮬레이션을 수행하였으며, 시뮬레이션 결과가 주어진 제약 조건을 만족하는 것을 확인하였다. 또한 제주 공항의 실제 항공기 출·도착 데이터인 FOIS (flight operation information system) 데이터를 기반으로 시나리오를 제작하여 시뮬레이션을 진행하였다. 개발한 스케줄러의 실효용성을 판단하기 위해, 실제 평균 지연시간과 스케줄러를 통해 산출한 평균 지연 시간을 비교하였다. An airport surface movement scheduler using first-come first-served (FCFS) algorithm is developed to efficiently manage surface traffic in an airport. It is based on the previously developed traffic flow management scheduler. Link directionality and intersection processing, which are additional constraints for ground movement, are added to the scheduler. To verify each of additional constraints, several simulations were performed by making simple scenarios, and the results show that all constraints were satisfied. Also, a simulation was performed by making a scenario based on flight operation information system (FOIS) data which is real departure and arrival flight data of Jeju airport. To determine the practicality of the developed scheduler, we compare the actual average delay time with the average delay time calculated by the scheduler.