• Journal of Korean Society of Transportation
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• v.25 no.4
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• pp.79-87
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• 2007

The interchanges of urban freeways have many problems with traffic operation due to high off-ramp flows and frequent congestion at adjacent intersections. The flow exiting from off-ramps is affected by the operational status and traffic volume conditions of the nearest signalized intersection. As a result, off-ramp flow cannot exit and the queue backs up the freeway mainline when queues from the signalized intersection form up to the junction of the off-ramp and street. The spacing between an off-ramp and an adjacent intersection is likely to determine the traffic conditions at the adjacent intersection. However, the current design guidelines do not consider such a factor. This study is to develop a model calculating the spacing between off-ramps and adjacent intersections considering the signal, traffic, and road conditions. The variables affecting the model in this study are effective green time (g/C), volume-capacity ratio (v/c), the number of lanes, and off-ramp volume. Various scenarios are designed to represent the effects of the variables and the road networks are constructed using VISSIM, which is a common traffic micro-simulation software package. The queue length is derived from VISSIM and this length is considered as the recommended spacing between the off-ramp and the adjacent intersection. Through the simulation analysis, regression models are developed to calculate the queue length reflecting the various conditions such as signals, traffic, and road configurations. The developed model can be used to create road design guidelines to determine the location of off-ramps in the planning stage.

• Proceedings of the KOR-KST Conference
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• 1998.10b
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• pp.452-452
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• 1998

1. 세계 항공시장의 동향 ○ 항공운송산업의 규제완화 및 항공자유화 추세의 확산 -78년 미국의 규제완화 이후 유럽, 대양주, 아시아 등으로 파급 ○ 미국의 항공자유의 정책(Open skies Policy)은 EU의 역대 완전자유화와 함께 세계항공시장의 자유화 촉진 ○ 항공사간 전략적 제휴의 확산 -British Connection, Star Alliance, Southern Comfort, Dutch Treat 등 4대 범세계적 제휴가 결성 또는 추진 중. 2. 우리나라 항공운송산업의 현황 ○ 세계 10위권 항공운송국가로 성장 -화물 세계5위, 여객 11위(97 ICAO통계) -김포공항은 97년 중 36.5백만명 처리로 세계9위 차지 ○ IMF체계의 영향과 경영수지 변화 추이 -98년 내국인 출국자는 감소하였으나, 외국인 관광객은 증가(10.8%) * 98. 1∼8전년대비 수송수요 국제선 17%, 국내선 26% 감소 -97년 양 항공사 적자규모 약 4,000억원으로 대폭 증가, 98상반기 회복추세. 3. 21세기 국제항공정책 방향 ○ 적극적인 항공시장 개방정책 추진과 역내 주요도시간 셔틀화 ○ 세계 주요 항공사와의 전략적 제휴를 지원하여 세계항공시장에서의 경쟁력 제고 * KAL-이, AAR-AA -인천국제공항의 HUB화 추진(민간 경영기법 도입, 항공개방정책 등) ○ 항공사가 최적의 노선망과 경제성을 갖도록 하는 적정 성장방안 강구 ○ 선진국 수준의 획기적 항공안정 체계 확립

• Journal of Digital Convergence
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• v.19 no.9
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• pp.9-18
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• 2021

Constructing the Metropolitan Railway Express (the GTX) may have an impact on consumer confidence and housing sales price located near the planned route. This study looked at how consumers' psychology and housing prices change as the large-scale transport infrastructure plane was planned. Also, it looked at the relationship between consumer sentiment and housing prices to analyze the impact of new transportation facilities inflows. Using a correlation analysis, the relationship between the consumer sentiment index and the actual transaction price of apartments was identified. The impact of GTX on the consumer sentiment index and the actual transaction price of apartments was looked at using the Difference-in-Differences methodology. Our finding shows that the construction plan of a large-scale transportation infrastructure in the metropolitan area affects the sentiment of housing consumption and actual transactions. In a situation where the government is speeding up the construction of a wide-area transportation network such as GTX with the goal of becoming a city where people can commute to downtown Seoul within 30 minutes, policies that can stabilize the housing market in transportation hubs should be suggested.

• Journal of Korean Society of Transportation
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• v.22 no.4 s.75
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• pp.147-158
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• 2004

A class of SWP(Stochastic Wane Propagation) models microscopically mimics individual vehicles' stochastic behavior and traffic jam propagation with simplified car-following models based on CA(Cellular Automata) theory and macroscopically captures dynamic traffic flow relationships based on statistical physics. SWP model, a program-oriented model using both discrete time-space and integer data structure, can simulate a huge road network with high-speed computing time. However, the model has shortcomings to both the capturing of low speed within a jam microscopically and that of the density and back propagation speed of traffic congestion macroscopically because of the generation of spontaneous jam through unrealistic collision avoidance. In this paper, two additional rules are integrated into the NaSch model. The one is SMR(Stopping Maneuver Rule) to mimic vehicles' stopping process more realistically in the tail of traffic jams. the other is LAR(Low Acceleration Rule) for the explanation of low speed characteristics within traffic jams. Therefore, the CA car-following model with the two rules prevents the lockup condition within a heavily traffic density capturing both the stopping maneuver behavior in the tail of traffic jam and the low acceleration behavior within jam microscopically, and generates more various macroscopic traffic flow mechanism than NaSch model's with the explanation of propagation speed and density of traffic jam.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.342-342
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• 2016

국내 저수지 17,477개소 중 30~40 여년전에 축조된 곳은 16,646개소로 95.2%가 노후화로 인한 지속적인 유지보수가 필요하며, 기후변화에 따른 대응능력이 현저하게 낮다. 하구둑, 방조제, 대형 농업용저수지 같은 대규모 농업기반시설들은 축조 당시보다 설계홍수량이 2~3배 이상 증가함에 따라 기후변화에 대비하기 위해 조속한 치수능력 증대가 필요하다. 하지만 대형 농업용저수지의 치수능력 증대를 위해서는 지형적 입지조건, 시공 가능성, 경제성 등을 고려하여 여수로의 위치, 규모, 형식 변경 등이 수반된다. 따라서 본 연구에서는 무한천 상류 예당저수지의 여수로 위치변경에 따른 저수지 하류 하천 흐름변화에 대하여 2차원 수치모의 연구를 수행하였다. 본 연구에서는 TELEMAC-2D 모형을 적용하여 저수지 하류 하천의 흐름을 모의하였고, RMA-2 모의결과와 비교검토 하였다. TELEMAC-2D 모형은 상류(subcritical flow)와 사류(supercritical flow) 흐름 모의가 가능하며, 홍수범람 뿐만아니라 동일 격자망으로 유한요소법과 유한체적법 모두 수치모의가 가능한 특징이 있다. 본 연구에서는 시간과 공간에 대하여 2차 정확도를 가지는 WAF(Weighted Average Flux) 유한체적기법과 $k-{\varepsilon}$ 난류모형을 적용하였다. 수치모의시 유역종합치수계획의 30년, 50년, 100년 빈도 계획홍수량에 대하여 여수로 위치변경 전(CASE-1)과 위치변경 후(CASE-2) 저수지 하류하천 흐름변화에 대해 모의하였다. 본 연구는 국내 하천 특성을 반영한 기설 저수지의 하류하천의 흐름에 대한 수치모의의 기초자료로 활용되어, 저수지 방류 흐름이 하류하천에 미치는 영향 분석 등에 기여할 것으로 기대된다.

• Journal of Korean Society of Transportation
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• v.22 no.2 s.73
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• pp.131-143
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• 2004

Given a path represented by a sequence of link numbers in a graph, the vine is differentiated from the loop in a sense that any link number can be visited in the path no more than once, while more than once in the loop. The vine provides a proper idea on complicated travel patterns such as U-turn and P-turn witnessed near intersections in urban transportation networks. Application of the link label method(LLM) to the shortest Path algorithms(SPA) enables to take into account these vine travel features. This study aims at expanding the LLM to a K-th path search algorithm (KPSA), which adopts the node-based-label correcting method to find a group of K number of paths. The paths including the vine type of travels are conceptualized as drivers reasonable route choice behaviors(RRCB) based on non-repetition of the same link in the paths, and the link-label-based MPSA is proposed on the basis of the RRCB. The small-scaled network test shows that the algorithm sequence works correctly producing multiple paths satisfying the RRCB. The large-scaled network study detects the solution degeneration (SD) problem in case the number of paths (K) is not sufficient enough, and the (K-1) dimension algorithm is developed to prevent the SD from the 1st path of each link, so that it may be applied as reasonable alternative route information tool, an important requirement of which is if it can generate small number of distinct alternative paths.

• Journal of the Korean Regional Science Association
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• v.35 no.3
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• pp.7-23
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• 2019

Smart cities are expanding their spatial scope to urban areas and regions. Linking regional economic development strategies beyond the borders with smart city planning can lead to cooperation and economic development between regions and countries as well. The purpose of this study is to suggest cooperation and regional development of the three nations - Korea, North Korea and China - through the Yellow Sea Rim Smart Region. To this end, smart city strategies and economic development plan with implementation status in the three countries including special economic zones have analyzed that could be the spatial basis of the smart region. On the west coast of Korea facing the Yellow Sea, lots of projects related to smart cities are actively underway in Saemangeum, Yellow Sea Free Economic Zone(YESFEZ), and Incheon Free Economic Zone(IFEZ). Although the political situation is still uncertain, North Korea is analyzed to have economic and technical potential in the west coast connecting Haeju, Nampo, and Sinuiju. In Liaoning and Shandong provinces of China, smart city projects have been actively promoted in recent years especially in the state-supporting industrial cities. Restoration of economic cooperation between South Korea and China, linkage of transportation networks, vitalization of cross-border cooperation projects between China and North Korea centered on Dandong and Sinuiju, and the connecting of smart city infrastructure and services for China and South Korea's economic cooperation process will make the Yellow Sea Rim as a world prosperous economic region. However, it is necessary to establish and operate a governance system through long-term planning for transnational consultation and establishment of a promotion organization.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.614-627
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• 2018

Urban railway lines have been constructed adjacent to residential buildings and urban areas. The expansion of transportation networks and reconstruction of residential buildings in highly populated urban areas require deep excavations in areas adjacent to urban railways. Mobilized soil stresses and changes in the groundwater level induced by deep excavations results in track irregularities in urban railways. In this study, a three-dimensional finite difference model using the commercial program FLAC3D was adopted to estimate the horizontal displacements of earth retaining structures, settlements of backfill, the stability of track irregularity and underground box structure based on the criteria of each railway organization and its relationships. In deep excavations, a change in groundwater level induces relatively very small differences for track gauge irregularities, whereas relatively large differences for longitudinal irregularities of 72.5%, twist irregularities of 83.3%, cross level irregularities of 61.9%, and alignments of 43.3% were found to be the maximum differences when the horizontal displacement of earth retaining wall and settlement of backfill were 65.1% and 21.4%, respectively, because the groundwater level (GWL) on the ground surface-mobilized tensile strength of the underground box structure exceeds the allowable value. Therefore, three-dimensional numerical analysis was performed in this study. Overall, real-time monitoring should be carried out to prevent railway accidents in advance when a deep excavation adjacent to urban railway structures is constructed.

• Journal of Global Scholars of Marketing Science
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• v.2
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• pp.59-79
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• 1998

전라남도와 경상남도는 강 하나를 사이에 둔 아주 가까운 이웃이며, 주민생활권이나 지역경제권이 상로연계성을 갖고 있다. 뿐만아니라 사회, 경제 문화와 보유자원의 여러 측면에서도 상로 본완적 성격을 갖고 있는 지역이다. 따라서 대승적 차원에서 볼 때 국토의 균형박전을 도모하고 진정한 동서화합을 위해 상로연계성을 갖고 있는 광양만, 진주권 광역새발을 공동으로 추진하여 동시화합의 대전기를 마련하는 계기로 삼아야 할 것이다. 이러한 차원에서 동서지역의 광역개발 필요성을 요약하면, 첫째, 최근 일정지역의 행정구역을 넘어서 인구와 물자 및 자원의 이용이 활발하게 이러나고 있어 통합적 계획 및 집행이 요구된고 있다. 따라서 광양만 진주권개발은 2개도에 걸쳐 광역개발권역을 설정한 우리나라 최초의 시범적인 계획으로써 세계적인 관심을 보이고 있다. 둘째, 국가경쟁력을 강화하기 위한 신산업지대의 조성과 연계교통망의 구축이 요망된다. 셋째 국토균형발전을 위해 수도권에 대응한 지방거점 도시권의 육성이 팽배하며, 넷째, 중북투자를 피하고 상호보완적인 기능을 극대화하여 진정한 동서화합에 대한 시대적 여청이 증대되고 있는 시절이다. 따라서 광양만 진주권 광역개발의 기본구상은 우선 경제적 물리적통합으로 실절적인 동서이익을 보색하는 차원에서 추진되어야 한다. 그리고 광양함을 국제물류의 중심지로 확충하고 주변지역에 대규모 물류 유통 및 국제기능을 유치하여 국제적 교류거점으로서의 기반 조성을 강화 하여야 한다. 또한 국제관광벨트 및 신산업지대의 형성과 함께 세계화 고속화에 걸맞는 교통기반시설을 정비하는 한편 자연친화적인 개발전략을 이룩함으로써 지구촌 경제하에시 지역균형개발과 지역의 국제경쟁역 확보차원에서 실현되어야 한다. 나아가 과양만권과 진주권의 경제 사회적인 통합을 달성함으로써 국민적 염원인 동서화합의 장으로 승화 발전 시킬 수 있도록 공간구조 및 기능의 분담배분이 요구된다. 기능은 동시지역을 연결하는 통합적인 기능 분담으로 과양만은 생산 및 물류지원기능의 강화와 전주 사천권은 첨단산업 연구 및 지원기능의 강화차원에서 배분이 요구된다. 이러한 광역개발계획이 세계적으로 추진될 때에 진정한 동서화합은 가능할 것이다. 따라서 진정한 도서화합을 유도하기 위해서는 광역개발을 실펀하기 위한 제도적인 협력체계의 구축이 요구된다. 동서지역의 광영개발을 위한 협력체계의 구축 방안은 첫째, 양 지역간에 협약제도르 도입함으로써 광역개발의 집행력을 강화하여야 한다. 즉, 개별 개발사업별로는 협약이 체결됨으로써 자치단체간의 역활분담이 분명하고 여차별 예산의 확보는 물론 사업시행이 구체화 될 수 있기 때문이다. 둘째는 양 자치단체간의 광역행정을 진담하는 기구의 절차가 필요한다. 광역개발 계획 추진 뿐만아니라 실질적으로 양권역이 공존공영을 위해 필요한 사업들을 추진 할 수 있도록 협의회 기능을 보완한 새로운 전담기구의 설치가 필요하다. 셋째. 광양만 진주권 광역개발 계획은 동서지역의 화합이라는 상징적인 의미를 지니고 있다. 따라서 중앙정부는 동서지역간의 진정한 화합을 유도하기 위해 제주도개발 특별법과 같은 �G동서지역개발 특별법�H을 제정하여 종합적이고 체계적인 개발을 유도 하여야 한다. 지역발전을 이룩할 수 있도록 자속적인 노력이 필요하다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.37 no.1
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• pp.125-132
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• 2017

The development project of Busan New Port aims to be Logistics Hub Port but there are too many things to deal with ; enlargement of harbour, interport competition, modernization of harbour loading equipment and so on. At present, 23 berths of North and South container quay are in operation and 22 berths will be constructed on west and south-side by 2020. Namely, Busan New Port will operate 45 berths in 2020. When it comes to port distripark, a large-scale of Port distripark project is underway, such as Ung-Dong district 1,2 phase, West container 1,2phase, North distripark and so on. This study is to deduce traffic system problem of Busan New Port which is caused by the development project through predicting traffic need considering the development project. According to study, there are three main problems of traffic system : 1. traffic congestion caused on main crossroad, connecting second harbour back road. 2. It has been predicted that South-North road and traffic capacity of New Port road would lack compared to traffic volume-to-be-increased. Moreover, the detour volume of traffic is caused because New Port's 1st avenue and route 2 were not connected directly. Thus, this study suggests three kinds of improvement plan for smoother traffic flow. 1st. Operate roundabout on major intersection, for example, second harbour back road, west container wharf's subway corridors(South to North), and permit only right turn on sub-intersection. 2nd. Extend New Port road(North container's port road) by utilizing side walk and median. 3rd. Install exit ramp which utilizes Route 2 connecting New Port's 1st avenue and local road 1042. The method we used to analyze the effect of improvement is Vissim of Mircro Simulation Package.