• 해양환경안전학회지
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• 제20권2호
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• pp.186-192
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• 2014

본 연구에서는 대정해상풍력단지 설치 해역과 인근수역을 이용하는 선박교통량과 해상교통흐름의 패턴을 분석하고 단지 조성 후 합리적인 대체통항로 지정에 따른 교통량을 예측하였다. 또한 예측된 교통량을 근거하여 통항로별 통항안전성을 평가하고 검토함으로써 선박의 안전운항에 필요한 제반조건 및 대책을 제시하였다. 풍력단지 설치 해역과 인근수역의 해상교통흐름 패턴을 분석한 결과 총 8가지의 교통흐름으로 분류되었고, 연간 교통량은 8,975 척으로 예측되었다. 이를 근거로 단지 조성 후 4가지의 대체 통항로 지정에 따른 교통량을 예측하였다. 예측된 교통량과 SSPA의 동력선충돌모델을 이용하여 통항안전성을 평가한 결과 충돌 및 침로이탈확률에 관한 국내 안전기준 $10^{-4}$ 이하를 만족하므로 계획된 대체통항로가 유용함을 확인하였다.

• 한국항공운항학회지
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• 제28권2호
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• pp.36-46
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• 2020

This study is designed to help customers use more comfortable airports by predicting congestion and congestion times by identifying the traffic routes of passengers in the airport building by day of the week and time by using Wi-Fi sensor collectors, one of the IoT technologies. Analysis of passenger traffic analysis data showed that the most congested time zones were from noon. to 2p.m. for all facilities, which could be used to improve major facilities. Regression analysis of factors affecting congestion found that self-check-in reduces congestion and check-in counters increases congestion. These findings will provide important implications for operations, including congestion management at airports.

• 한국항공운항학회지
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• 제9권1호
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• pp.31-44
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• 2001

This paper addresses legislation status of air route design standard of Korea. Korea Ministry of Construction and Transportation's Order Number 300 (March 28, 2001) prescribes that firstly, the design of air routes in Korea should be in accord with International Civil Aviation Organization(ICAO)'s recommendations published in Annex 11: Air Traffic Service and Procedures for Air Navigation Services: Aircraft Operations (ICAO Doc 8168-OPS, 1986), and secondly, United States Federal Aviation Administration(FAA)'s Terminal Instrument Procedures (FAA, 1976). An investigation on the current air route specifications of Korea reveals that they are in accord with neither ICAO's recommendations nor FAA's standards in that the width of Korea's air routes are narrower that the international recommendations and standards. As a member state of ICAO, it is imperative for Korea to follow the international standards. In that purposes, Korea should legislate and regulate the detail standard for air route design. For the legislation, FAA regulations are to be followed because FAA rules contains more detail specifications while ICAO recommendations includes allows a range of policy decisions, which may result in a confusion in practice.

• 한국철도학회논문집
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• 제10권2호
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• pp.179-185
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• 2007

In large station with high density traffic, trains can be hardly controlled by CTC but by station dispatcher because CTC has difficulties in monitoring all states of affairs happening within each station such as departures, arrivals of many trains from different lines and shunting of trains to move between yards and platforms, etc. Therefore the station's dispatcher has to make quick decision about how to reschedule the times and routes for all the trains scheduled within a specific time window. And such decision becomes harder when an unexpected delay occurs because a delay occurring in a train propagates other trains as time goes on. Generally, it is called the conflict detection and resolution to adjust beforehand the distorted schedule due to a delay to original schedule. Our research is different from the state of the arts in that ours determines simultaneously the routes and the times of arrival and departure of trains, although others do only the arrival and departure time of the trains without considering the alternative routes and shunting of the station. This study suggests a mathematical approach for how to detect in advance and resolve efficiently the conflicts occurring within a station and it will be shown how to reduce delay using our approach by means of analysing the schedule of ChyungRyangRi station.

• 대한교통학회지
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• 제27권1호
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• pp.63-71
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• 2009

본 연구의 목적은 이용자 입장에서 정시성이 열악한 노선들을 파악하는 것이다. 이를 위해 서울시의 도심으로 향하는 간선노선을 대상으로 BMS자료를 이용하여 노선별 배차간격의 오차율과 운행시간의 오차율을 계산한 후, 자료 포락분석기법을 이용하여 두 지표를 통합한 노선별 정시성을 분석하였다. 그 결과를 통하여 노선들과 교통권역들의 정시성을 비교하고, 정시성이 열악한 노선들을 개선할 필요성과 이용자들에게 현실을 감안한 운행스케줄을 제시할 필요성이 있음을 제안하였다. 향후 연구로는 BMS와 교통카드 시계열 자료를 이용함으로써 각 노선의 다른 운행환경을 반영한 정시성 범위를 파악하여 노선별 정시성 평가틀을 개발하고, 정시성이 열악한 노선들에 대한 개선방안을 제시할 필요가 있음을 제안하였다.

• 한국항만학회지
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• 제12권2호
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• pp.233-242
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• 1998

The Inchon port has been heavily congested due to the tidal restriction in passing the lock and the shortage of berths or warehouses. The current congestion is predicted to become worse by the induced traffics near the lock entrance after completion of North harbour expansion and of Kyung-In canal construction. It is also expected that the newly developed configuration of the Inchon port will result in increasing the rate of marine accidents around the lock entrance because of the over-utilization of the limited capacity of the junction from the North harbour and the Kyung-In canal. This study adopts a systematic approach in analysing the physical distribution system of the inner-lock area in order to figure out alternative routes which are designed to improve the port efficiency. Ship maneuvering simulation is also attempted to propose a new approaching route to the canal as an alternative path in order to avoid the traffic accidents caused by the extreme congestion. The result of the ship maneuvering simulation demonstrates that the alternative routes by way of Buk-Sudo, Janbong-Sudo, north of Si-Do and Sin-Do is recommended routes which can satisfy the safety requirements of approaching to the canal entrance.

• 대한교통학회:학술대회논문집
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• 대한교통학회 2000년도 제37회 학술발표회논문집
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• pp.25-47
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• 2000

In route guidance systems fastest-path routing has typically been adopted because of its simplicity. However, empirical studies on route choice behavior have shown that drivers use numerous criteria in choosing a route. The objective of this study is to develop computationally efficient algorithms for identifying a manageable subset of the nondominated (i.e. Pareto optimal) paths for real-time vehicle routing which reflect the drivers' preferences and route choice behaviors. We propose two pruning algorithms that reduce the search area based on a context-dependent linear utility function and thus reduce the computation time. The basic notion of the proposed approach is that ⅰ) enumerating all nondominated paths is computationally too expensive, ⅱ) obtaining a stable mathematical representation of the drivers' utility function is theoretically difficult and impractical, and ⅲ) obtaining optimal path given a nonlinear utility function is a NP-hard problem. Consequently, a heuristic two-stage strategy which identifies multiple routes and then select the near-optimal path may be effective and practical. As the first stage, we utilize the relaxation based pruning technique based on an entropy model to recognize and discard most of the nondominated paths that do not reflect the drivers' preference and/or the context-dependency of the preference. In addition, to make sure that paths identified are dissimilar in terms of links used, the number of shared links between routes is limited. We test the proposed algorithms in a large real-life traffic network and show that the algorithms reduce CPU time significantly compared with conventional multi-criteria shortest path algorithms while the attributes of the routes identified reflect drivers' preferences and generic route choice behaviors well.

• 한국항공운항학회지
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• 제31권4호
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• pp.126-132
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• 2023

During the COVID-19 pandemic, there have been many changes in the aviation industry as a whole. Passenger traffic has decreased, but on the contrary, the international transport demand for cargo planes has never been higher. Due to their geopolitical location when flying to major cities around the world, Korea's international pilots are bound to have relatively more jet lag-causing routes than their American or European-based pilots. Through this study, we tried to analyze the degree of fatigue and fatigue weighting factors according to operating conditions for domestic pilots. As a result of the study, the following conclusions were drawn. Despite the variety of models, routes, and fatigue between individuals, it was found that the 3 Pilot operation route was concentrated as a representative fatigue route. Most of the individual fatigue improvement request sections showed higher fatigue as the night flight section was longer among the 3Pilot routes for more than 12 hours, and 43 out of 90 participants (Korean Air pilots) focused on 3Pilot (two captains and one pilot) as fatigue-intensive operating conditions. Therefore, it proposes an improvement in the system of applying 12-hour unification standards according to Korea's geopolitical international operating conditions and time difference standards.

• 대한교통학회지
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• 제29권6호
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• pp.129-136
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• 2011

VMS는 대안경로의 현황정보를 제공하는 정보수단의 역할뿐만 아니라, 경로선택에 영향을 줌으로써 통행 분산효과를 내는 제어 측면의 역할도 수행한다. 그러나 대안경로간 최적의 통행배분을 유도할 수 있는 VMS 제어기 없이, 교통관리 업무를 담당하는 센터 운영자 개인의 경험에 의존하여 대처하고 있는 실정이다. 퍼지 제어는 수학적 모델로 표현되기 어려운 복잡하고 애매한 시스템에 대하여, 전문가의 경헙적 지식이나 실제 실험 데이터에 의해 제어시스템의 규칙 또는 제어알고리즘을 만들 수 있는 장점이 있다. 이에 이러한 퍼지 제어의 장점을 살려 대안경로간 통행시간 균형을 달성할 수 있는 VMS 피드백 제어기를 설계하고 MATLAB/Simulink를 이용하여 그 성능을 검증하였다. 본 연구에서 제시한 제어기는 통행시간 균형이라는 제어목표에 수렴하고 있으나, 유출입교통량 증가와 Driver Compliance Rate 감소 등 외란에 민감하게 반응하여 수렴시간 과도하게 증가하는 현상이 나타났다. 이러한 외란에 보다 강한(Robust) 제어기로의 성능개선을 향후과제 남겨두며, 본 연구 결과를 발전시켜 실제 현장의 VMS 운영에 적용한다면 교통운영기술 진일보에 기여할 수 있을 것으로 기대된다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.582-585
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• 2018

교통량이 증가하고 도로 네트워크가 복잡해짐에 따라 정확한 교통 흐름 파악을 통해 교통의 원활한 흐름을 유도하는 것은 많은 국가의 관심사항이다. 교통 흐름을 효과적으로 알기 위한 다양한 분석 기술 및 연구들이 있어 왔지만 위치(GPS) 데이터를 포함한 데이터 시각화를 통해 먼저 교통 흐름의 패턴을 찾는 것이 필요하다. 본 논문에서는 실제 도시의 교통 궤적을 시뮬레이션한 내용을 도구로 사용함으로써 교통 흐름의 패턴을 시각화하는 것을 목표로 한다. 이에 24시간운행 되어 지고 정해진 경로가 없는 특징을 가진 실제 택시 40대에 센서 모듈을 설치하여 IoV(Internet of Vehicle)데이터를 수집하고 이 데이터를 이용하여 전처리 과정을 거친 후 오픈소스 기반의 데이터 시각화 도구를 우리의 데이터 특성에 적합하도록 개선하였다. 해당 시각화 모델은 시간 흐름에 따른 차량 트랙킹 Dot을 통해 차량 밀집 지역과 이동 경로 패턴 인식이 가능하므로 도시 내에서 또는 도시와 도시간의 교통 흐름 파악을 통해 도시 환경 문제 개선에 기여할 것으로 기대된다.