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A Study on the Improvement of SOC Project Planning Process and Systems (국내 SOC 사업의 기획업무 개선에 관한 연구)

  • Shin Dongwoo;Kim Yea-Sang
    • Korean Journal of Construction Engineering and Management
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    • v.1 no.1
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    • pp.45-52
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    • 2000
  • In Korea, demand for the Social Overhead Capital(SOC) projects has tremendously increased since 1970's and is expected to keep growing to support national economic development as well as to enhance the quality of life. In these projects, project planning and feasibility study phase is one of the most critical phases because it determines the success of later phases. However, we have experienced trial and errors repeatedly such as cost overruns and schedule delays in many of the SOC projects. These problems can be prevented or at least expected in the earlier phase and it requires well-developed and standardized project planning process and systems before design, procurement, and construction phases begin. Therefore, the purpose of this research is to investigate current problems in this phase and provide framework for a model for the project planning management which can be used for the SOC projects to insure the whole project success.

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Suitability Assessment and Maintenance Planning of the Guided Drainage Method on Underpass Structure (유도배수공법을 적용한 지하차도 설계 및 유지관리방안)

  • Jin, Kyu-Nam;Lee, Jung-Min;Kim, Young-Jin;Park, Jae-Hyeon;Cho, Gye-Chun
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.3 no.1
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    • pp.97-109
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    • 2012
  • For the design of underpass structures, -1.0m(G.L) ground water level guideline for the design of railway, subway, utility tunnel etc, is still being used in Korea. As a result, the underpass structure can be forced by buoyancy, and therefore the in-situ buoyancy anchor method is usually being applied to prevent the uplifting force. For the Yeongjongdo sky city project, the drainage method was applied to remove the buoyancy force. In this study we estimate the efficiency and safety of the applied design and propose the detailed guidelines for standard design and maintenance of the guided drainage technique. Especially, the auxiliary pumping well was operated to maintain the ground water level around the underpass. In the study site, the applied guided drainage method has advantages in both engineering and economic aspects.

An Analysis of the Effects of Walking Guidance System in Subway Stations using Genetic Algorithm (유전 알고리즘을 이용한 지하철 역사 동선 분리 시스템의 효과 분석)

  • Kim, Jin-Ho;Lee, Joo-Yong;Kim, Tae-Wan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.3
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    • pp.617-624
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    • 2015
  • The conflict of opposing pedestrian traffic-flow in a subway station(made up of stair, passageway, and escalator) diminishes the convenience and mobility of its users. In addition, the station's efficiency would be negatively affected by the growth of delay and queue length in pedestrian facilities. As these phenomena have been resulted by the overlapping in pedestrian's traffic-line, the separation of it would alleviate these problems. For the criteria and methodology of separation, this paper has investigated the bi-directional queue length and delay on the entrance of each facility (stair, passageway and escalator). Since the pedestrian flow exists bidirectionally, we have used the weighted average by inflow rate for the delay value. For the optimization of the separation, the Genetic Algorithm has been utilized in order to minimize the delay.

An Exploratory Analysis of Locational Characteristics Impact on the Discrepancy between Predicted vs. Actual Demand of Rail Transit (전철역 입지특성이 예측된 수요와 실제 수요 간의 차이에 미치는 영향에 관한 탐색적 연구)

  • Eo, Yu Ra;Kang, Myounggu
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.1D
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    • pp.133-139
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    • 2011
  • We built subway stops in order to meet demand. To do so, a standardized method is used to predict the demand. However, in some subway stops there are only few people moving around sparsely, but in some other stops there are too many people crammed in a crowd. The gap between forecasting and actual uses varies from 10% to more than 1,000%. This study is aimed to find out where this discrepancy between predicted vs. actual demand for urban rail transit comes from. Specifically, 40 subway stops in Seoul Metropolitan Area, which were opened last 10 years, are examined. This study suggests that, for better forecasting, we need to consider stops' locational characteristics as well as weekday commute-oriented exogenous factors. Locational characteristics includes; whether a stops is a terminal and/or weekend tourism node. There seems no "one size fits all" solution for transit demand forecasting; locational characteristics need to be reflected.

Analysis of cause and deterioration about using 3-Arch tunnel (공용중인 3-Arch터널의 열화조사 및 원인분석)

  • Lee, Yu-Seok;Park, Sung-Woo;Whang, In-Baek;Shin, Yong-Suk;Kim, Sun-Gon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.11 no.1
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    • pp.97-105
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    • 2009
  • This paper studied the cause of the deterioration of the four 3-Arch tunnels built in mid-1990. The common deteriorations of the four 3-Arch tunnels were longitudinal cracks, leakage and efflorescence at the same parts of lining concrete. Three fourths of 3-Arch tunnels, there was high percentage longitudinal cracks and a quarter was low frequency about longitudinal cracks. So the material reviewed to find out the differences between two groups in construction process and analysis was conducted such as non-destructive testing, precise visual survey and safety evaluation of one tunnel which had bad ground condition As the result, the tunnels were safety condition and the primary deterioration occurred during the construction process, namely, problems arrangement of rebar and the effects of the blast at middle tunnel.

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Foreign Direct Investment and Economic Growth: A Cross-Country Analysis (외국인 직접투자와 경제성장에 대한 다국가 분석)

  • Jeong, Dong-Won;Jeong, Kyong-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.10
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    • pp.588-596
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    • 2017
  • Although many policy makers and scholars argue that foreign direct investment is crucial to the economic growth of developing countries, there is no universal agreement on the positive relationship between foreign direct investment inflows and economic growth. Using a cross-country analysis based on data from 88 countries for the years 1990-2015, this paper empirically explores the impact of FDI on economic growth. To this end, several versions of the neoclassical growth models, explicitly including FDI, are estimated. Subject to the appropriate caveats, the results provide further support for several key conclusions of former studies, including the inference that investment in physical capital, population growth, and human capital are important in accounting for economic growth across countries. The results show that FDI significantly contributes to economic growth in developing countries.

Evaluation of Analysis Technique for Piles Driven by Vibration through Parametric Study (매개변수연구를 통한 진동타입말뚝 해석기법 평가)

  • Lee, Seung-Hyun;Lee, Su-Hyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1749-1755
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    • 2014
  • Technique for analyzing a pile installed by vibrohammer was developed and parametric studies were executed in order to evaluate reliability of the developed technique. Comparing the accelerations obtained from parametric studies of varying eccentric moment and frequency, it can be seen that magnitude of maximum acceleration was proportional to the eccentric moment and square of frequency. It can also be seen that amplitude of displacement was roughly proportional to the eccentric moment but has nothing to do with the frequency. It can be said that all of the analysis results reflect characteristics of behavior of a pile in case of free vibration. Comparing the dynamic load transfer curves, maximum dynamic unit toe resistance was constant regardless of the eccentric moment and the frequency and it can be seen that dynamic unit skin friction was affected by the eccentric moment not by frequency. Comparing all of the analysis results, it can be said that the developed technique is reliable.

Numerical Analysis of Load Bearing Behavior of Shallow Foundations (얕은기초의 하중지지거동에 관한 수치해석)

  • Lee, Seung-Hyun;Lee, Su-Hyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.10
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    • pp.6322-6328
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    • 2014
  • Finite element analyses were performed to find out the load bearing behavior of three kinds of shallow foundations. The analysis results for strip footing showed that local shear failure mode could be observed for a zero dilatancy angle and general shear failure mode could be seen for non-zero dilatancy angles. The ultimate bearing loads for non-zero dilatancy angles were approximately 1.5 times higher than that of a zero dilatancy angle. General shear failure mode was observed for circular footing and square footing regardless of the dilatancy angle. The ultimate bearing loads for a non-zero dilatancy angle were slightly greater than that for a zero dilatancy angle. A comparison of the load-settlement curves for three kinds of footing showed that the load bearing capacities for non-zero dilatancy angle were greater than those for a zero-dilatancy angle.

Development for establishing Big Data-based alley commercial area (빅데이터 기반 골목상권 영역설정 방법론 개발)

  • Hwang, Dong-Hyun;Ko, Kyeong-Seok;Park, Sang-June;Kim, Wan-Su
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.11 no.6
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    • pp.784-792
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    • 2018
  • In this study, we designed the area except the development market and the traditional market, where large scale shops were concentrated by realizing the real estate center of the alley commercial area. In addition, we have developed an area setting method for the alley area where reliability and rationality can be ensured by utilizing the actual data such as the business statistics, the survey data of the business, and the store business DB, which are managed by the local government or the state. The alley commercial areas were classified into five groups according to density. It is thought that users can distinguish the commercial areas from dense commercial areas to the commercial areas in order to utilize various commercial areas.

Dynamic Behavior of Composite Steel Girder Bridge Exceeding Train Speed 350km/h (차세대고속열차 운행에 따른 호남고속선 강합성교의 동특성 분석)

  • Kim, Eunsung;Park, JongWoong;Sim, SungHan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.7
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    • pp.3518-3527
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    • 2013
  • The new developed train(HEMU-430X) faces running at high speed over 400km/h. But The Korea railway design code gives guidelines below 350km/h speed. Honam HighSpeed Railway was also designed based on the design standard below 350km/h. Existing infra structures have to be reviewed at high speed running and the design guideline for the speed over 350km/h should be prepared as soon as possible. This paper presents (1) the simulation results of composite steel girder bridge(Kaya Bridge of Seoul-Pusan HighSpeed Railway), (2) values measured at this bridge and the comparison with simulation results, and (3) the prediction of Yonjung bridge being constructed in Honam HighSpeed Railway.