• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.206-209
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• 2005

Optimal path search systems to take continuously changed traffic flows into consideration is necessary in order to reduce the cost to get destination. However, to search optimal path in client terminals with low computing power yields high computational cost. Thus, a method with low cost and near optimal path as well is required. In this paper, we propose a path search method using variable heuristic for the sake of reducing operation time. The heuristic is determined by the change of the average speeds of cars located in grid which means a rectangle region.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.300-301
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• 2022

In order to improve the accessibility to the island through marine leisure ships, it is necessary to evaluate objective business feasibility of the ship's operation. In this study, costs and income were estimated based on the operating expenses and freight standards of similar marine leisure ships in operation, and based on this, the feasibility of the project was empirically analyzed through B/C analysis, NPV, and IRR. In addition, sensitivity analysis was performed for various variables to understand the requirements for securing minimum economic feasibility. As a result of the study, in case of new building ship, the B/C ratio was estimated to be 1.042, NPV was estimated to be KRW 1.93 billion, and IRR was estimated to be 2.1% which means that profitability was secured.

• Journal of the Korean Geographical Society
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• v.34 no.1
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• pp.63-84
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• 1999

본 연구는 청주시에 거주하는 중학교 교원 역통근의 공간적 특성을 밝히고자 한다. 분석 결과 종래 여성의 통근거리가 남성보다 짧고, 거주지 부근의 직장에서 근무한다는 연구 결과는 교원의 경우 적용되지 않는다고 볼 수 있다. 그리고 역통근자의 거주지는 통근시간과 비용을 최소화하기 위해 역통근지에 따라 거주지의 이전이 나타나며, 통근거리가 멀수록 다양한 교통수단을 이용하고 있다는 점이 밝혀졌다.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.1902-1907
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• 2007

This paper suggests improvements in travel cost function of transit assignment model by analysing existing model. Two types of travel cost function are widely used for congested public networks. The one is used for strictly restricting public transport capacity. Another is non-decreasing function such as BPR function. In this paper, we analyse two types of travel cost function in case of intercity rail. The characteristics of intercity rail are different from those of public transit in urban area. Therefore travel cost function must be differently applied in each case.

• Proceedings of the Acoustical Society of Korea Conference
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• 1995.06a
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• pp.47-51
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• 1995

음성인식기술을 이용한 시스템이 상용화되기 위해서 필요한 기술의 최근 동향과 현재의 기술로 실용화가 이루어지고 있는 서비스등에 대해 알아본다. 최근의 음성인식기술은 실용화를 목표로 음성 인식을 위한 기본 유니트 선정, 화자의 음성을 거절하는 기능, 및 실시간 구현 기술에 대한 연구가 활발히 진행되고 있다. 한편 현재의 기술로 가능한 실용서비스로는 전화번호 안내, 음성 다이얼링 서비스 등과 같이 현재 제공되고 서비스의 비용을 절감시키는 것과 교통안내, 날씨안내, 영화관 예약에 음성인식기술을 적용하여 새로운 서비스를 제공하는 것이 있다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2004.03a
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• pp.77-83
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• 2004

최근 통신, 전자, 제어, 기계등의 첨단기술을 적용하여 도로와 차량 그리고 운전자의 일체화를 통한 교통체계의 효율화, 첨단화, 정보화를 실현하기 위한 ITS(Intelligent Transport System)연구가 많이 진행되고있다. 그러나 이러한 ITS에서의 기본적인 자료인 도로위치정보의 정확도가 낮은 단계인 자료로서 시스템을 구축하고 있다. 또한 기존도로의 설계자료나 수치지도가 없는 지역인 경우가 많아 그 자료들을 획득하는데 많은 비용이 소모된다. 따라서 본 연구에서는 GPS 측위기법과 수치사진측량의 기법으로 도로중심선을 추출하여 보다 정확한 기법을 제시하고자한다.

• 한국벤처창업학회:학술대회논문집
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• 2018.11a
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• pp.35-37
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• 2018

본 연구는 민간 직업훈련 기관의 훈련생 모집에 영향을 미치는 요인을 분석하기 위해 훈련 등록한 대상들에게 설문조사를 실시하였다. 이를 위해 접근성 요인(교통편, 주차장 등), 시설 요인(교실 크기, 시설 환경 등), 상담자 역량 요인(응대 태도, 서비스 지식, 상담 Skill 등), 비용적 요인(훈련비, 훈련비 지원 유무 등), 교육 요인(교육 편성 내용, 강사진 등)으로 나누고 각 요인들이 훈련 등록에 어떠한 영향을 미치는지 분석 하였다.

• Journal of Korean Society of Transportation
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• v.29 no.6
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• pp.97-106
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• 2011

Mode choice model is an essential element for estimating- the demand of new means of transportation in the planning stage as well as in the establishment phase. In general, current demand analysis model developed for the mode choice analysis applies common parameters of utility function in each region which causes inaccuracy in forecasting mode choice behavior. Several critical problems from using common parameters are: a common parameter set can not reflect different distribution of coefficient for travel time and travel cost by different population. Consequently, the resulting model fails to accurately explain policy variables such as travel time and travel cost. In particular, the nonlinear logit model applied to aggregation data is vulnerable to the aggregation error. The purpose of this paper is to consider the regional characteristics by adopting the parameters fitted to each area, so as to reduce prediction errors and enhance accuracy of the resulting mode choice model. In order to estimate parameter of each area, this study used Household Travel Survey Data of Metropolitan Transportation Authority. For the verification of the model, the value of time by marginal rate of substitution is evaluated and statistical test for resulting coefficients is also carried out. In order to crosscheck the applicability and reliability of the model, changes in mode choice are analyzed when Seoul subway line 9 is newly opened and the results are compared with those from the existing model developed without considering the regional characteristics.

• Journal of Environmental Impact Assessment
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• v.25 no.1
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• pp.1-14
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• 2016

With the continuous expansion of highway network and its traffics, neighboring wildlife habitats are splitted into smaller and more isolated patches. The infrastructures contribute to the wildlife-vehicle collision by creating barriers to animal movement. This kinds of traffic accidents are dangerous factors to the drivers' safety and the facilities on the highway as well as to the wildlife themselves. One of the most common ways to prevent habitat fragmentation are fauna crossings and fences. The cost of the mitigation measures to prevent wildlife-vehicle collision could be monetized. However their economic benefits are difficult to be measured. Using contingent valuation method, this study tries to estimate the economic valuation of wildlife collision prevention projects on the Korean highways. The result shows that 43.88% of Korean household had the positive willingness pay to the projects. Moreover, we found that the recognition of the project or the favourable attitude to the environmental issues could raise the willingness-to-pay. Therefore, active public relation on the project could make the friendly public opinion and increase the number of the household which has the positive willingness-to-pay on the project.

• Journal of Korean Society of Transportation
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• v.31 no.1
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• pp.37-46
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• 2013

Lane closure in freeway work zone due to maintenance and repair of freeway facilities results in abrupt change of traffic flow. Sudden change of traffic flow results strong interactions among vehicles, and reduces capacity compared to the ordinary traffic condition. Such capacity reduction is likely to cause congestion, traffic queues, and economic loss cost. This study aims to determine the base capacity for a short-term freeway work zone that can be used to establish a work zone schedule in advance without any traffic impact. First, the research collected detector data and schedule data of road works on all freeways in Korea. Second, the research determined 23 study sites finding the capacity values of work zone after matching two kinds of data. All study sites had varying characteristics regarding traffic flow being adjacent to work zone during road works. The capacity values were reviewed in terms of lane closure configuration, the types of work, and design speed. Finally, research proposed capacity values for a short-term freeway work zone with the design speeds of 100 kph, 120 kph and 1,700 pcphpl, 1,750 pcphpl, respectively.