• Title, Summary, Keyword: 고속철도

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A Review of Salvage Archaeology in Korea and a Joint Research and Excavation Plan for North Korean Cultural Heritage (남북 문화유산 조사 현황과 공동조사를 위한 제언)

  • Choi, Jongtaik;Seong, Chuntaek
    • MUNHWAJAE Korean Journal of Cultural Heritage Studies
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    • v.52 no.2
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    • pp.20-37
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    • 2019
  • Three Inter-Korea summits and a North Korea-USA summit that were previously unexpected provide a basis for an optimistic outlook for the future development of Korean archaeology. While Korean archaeology has witnessed a great advance since the mid-20th century, it also exhibits significant weaknesses in explaining cultural changes in prehistory and the early historical period in the Korean Peninsula due to the paucity of information on archaeological evidence of North Korea. Recent development of favorable conditions for research and excavations of North Korean cultural heritage could be a valuable opportunity for Korean archaeology to overcome the current adversity. Especially, given the expected large-scale SOC industrial project in North Korea, we need to prepare for the systematic research and excavation of archaeological materials. The present essay attempts to provide a suggestion for the joint archaeological expeditions to excavate and manage cultural resources in North Korea based on a critical review of previous salvage excavations in South Korea, such as those conducted before the construction of the Korean rapid transit railway system (KTX). We suggest that professional archaeologists should be included in the project and oversee the planning and design of road and railway constructions and other SOC projects in order to minimize the cost of trial and error processes that were well exemplified by the KTX salvage excavations. The Korean Archaeological Society and North Korean Archaeological Society may organize a common association that will supervise joint archaeological expeditions. Importantly, The Korean Archaeological Society and other related institutions should prepare to build an organization that conducts impending archaeological excavation in North Korea. While we likely face challenges and difficulties during the various stages of archaeological research and excavations in North Korea, only through thorough and systematic preparation can we avoid the destruction of valuable cultural heritage and find an opportunity for the further development of Korean archaeology.

A Study on the Location Selection of Distribution Center on the KyongBu Expressway Axis (경부고속철도축을 중심으로 한 물류단지 입지설정에 관한 연구)

  • 송태호
    • Proceedings of the KOR-KST Conference
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    • pp.510-519
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    • 1998
  • 사회전반에 걸친 물류단지의 필요성에 대한 인식은 날로 높아지고 있으나, 물류단지의 입지를 정작 어느 곳으로 할 것인가에 대한 연구는 거의 없는 실정이다. 본 논문에서는 물류단지의 입지를 결정하는 여러 요인들 중 일반적으로 계량화 작업이 많이 이루어진 수송비와 ,대규모 개발 사업시 가장 먼저 고려해야 하는 토지보상비를 결정하는 지가를 물류단지의 입지를 결정하는 입지비용이라 가정하고, 현재 화물수송이 가장 많이 이루어지고 있는 경부고속도로축을 중심으로 입지비용을 결정하는 지가와 소송비의 산출을 위한 근거를 제시하며, 이를 설명할 수 있는 지가와 수송비의 모형을 지가와 수송비의 산출을 위한 근거를 제시하며, 이를 설명할 수 있는 지가와 수송비의 모형을 개발하여, 이 모형을 토대로 물류단지의 규모와 서울도심에서의 거리의 변화에 따라 물류단지의 입지가 어떻게 변화하는 가를 밝혀, 물류단지의 최적입지를 제시하는데 그 목적이 있다. 본 논문의 결론을 요약하면 다음과 같다. 1) 물동량의 증가에 따라 수송비가 증가하고, 물동량을 처리하기 위한 소요부지면적이 증가하면, 지가와 수송비의 교차구간은 도심에서약 15~20km 떨어진 구간에서 형성되고, 이 때의 최적입지는 물동량과 소요부지면적에 상관없이, 도심에서 약 60km 떨어진 안성군 및 평택시지역(경부고속도로 주변지역에 한함)이 최적입지로 분석되었다. 2) 수송비와 지가, 건설비와의 장래 20년을 기준으로 한 누적비용분석결과 0~40km 구간의 경우 수송비의 누적비용이 지가와 건설비의 누적비용을 초과하지 않으며, 수송비의 누적비용이 지가와 건설비의 누적비용을 초과하는 기간이 가장 빠른 것은 물류단지가 50~55km 구간과 60~65km 구간에 입지 하였을 경우로, 이 구간에서의 수송비 누적비용이 지가와 건설비의 누적비용을 초과하는 기간은 9년 후인 2004년으로 분석되었다. 이는 도심과 인접한 지역의 경우 물류단지가 입지하지 못하는 것은 물류단지의 건설에 따른 수송비의 절감이 물류단지 건설에 따른 지가 및 건설비에 대한 비용부담에 못 미치기 때문인 것으로 분석되었으며, 화물의 특성상 불가피하게 도심지역과 가까운 곳에 물류단지의 입지를 고려해야 할 경우, 물류단지 조성시 정부에서의 세금완화, 물류단지 조성가능지역 설정, 지가에 대한 보조 등 정책적인 지원대책이 필요할 것으로 판단된다. 3) 입지 비용중 수송비를 누적시킨 수송누적비용과 지가와의 비교분석결과 수송비를 5년, 10년 누적시켰을 때 이 물류단지의 최적입지는 도심에서 약 60km떨어진 곳으로 분석되었으며, 수송비를 20년 누적시켰을 경우 물류단지의 최적입지는 도심에서 약 50km떨어진 지점의 물류단지의 최적입지로 분석되었다.

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For Making an Efficient Disaster Emergency Communication System for Public Safety in South Korea (국민안전 확보를 위한 긴급통신망시스템 통합구축 방안)

  • Choi, Kwan;Kim, Min-Ji
    • Korean Security Journal
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    • no.44
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    • pp.169-198
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    • 2015
  • The purpose of present study is to provide an efficient 'Disaster Emergency Communication System' (below DECS) to deal with serious disaster situations in national levels. Currently, DECSs such as the VHF, UHF, and TRS are worked to control some disaster situations in the world. However, new system such as for sending the correct image and big data is more likely to need than current the DECSs in the comtemporary societies. Several serious disaster events such as the Sam-Poong Department Store Collapse, Daegu Subway Fire, and Sewol Submerge event, nevertheless, there was not the DECS based on the field in South Korea. In July 2014, finally, South Korean government started to provide a PS-LTE system which is the new and one system with fire fighting, police, army, railway. however, there are no many academic studies for DECSs to deal with disaster situations in South Korea. The present research highlights to explore an efficient DECS of Korean styles to fix some national security and public safety. The paper provides three key findings: first is how to make a unified Korean DECS based on PS-LTE. Second is how to make sure the frequency of 700MHz levels to communicate in the shady areas. Three is what kinds of communication facility is adequate for fixing PS-LTE DECS.

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Determining Priority of Transport Policies with a Focus on Data Envelopment Analysis with Ranked Voting Data (자료포락분석(DEA)을 이용한 교통정책 우선순위 설정에 관한 연구)

  • 홍석진;오재학;하헌구
    • Journal of Korean Society of Transportation
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    • v.21 no.5
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    • pp.49-58
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    • 2003
  • The Transport policies in Korea have been planned and implemented as a part of a larger economy policy based on the achievement of economic growth. As a result, previous transport policies have been focused mostly on the supply of transport infrastructure. The average annual economic growth of six percent and a twelve percent growth in motor vehicles until the late 90s led to the acceleration of the imbalance between the supply and demand of infrastructure. As such, there is a need to establish an innovative transportation policy in order to increase national competitiveness and provide momentum for national growth in the Twenty one century. This research has developed strategies and policies based on interviews that were carried out with specialists in transport field. Moreover, some transport policies have been established for the year 2020 through the conducting of a survey. The survey was conducted by interviewing respondents on making the priority of transport policies. which was then analyzed using the Data Envelopment Analysis with ranked voting data. The results are as follows. The most urgent matter was considered to be the development of a inter-modal transport system, followed by an integrated service system for public transport, and the need to increase the competitiveness of the transport and logistics industries and to further transport safety. Meanwhile, the provision of transportation for disabled people as well as the elderly was considered to be less important in Korea than in welfare nations. This stems from the belief as further attention needs to be paid to the construction of a public transport system, the establishment of transportation networks construction in preparation for reunification and the North-East Asian era, as well as the privatization of the transport infrastructure.

Modeling the Effect of Water, Excavation Sequence and Reinforcement on the Response of Tunnels

  • Kim, Yong-Il
    • Journal of the Korean Geotechnical Society
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    • v.15 no.3
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    • pp.161-176
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    • 1999
  • A powerful numerical method that can be used for modeling rock-structure interaction is the Discontinuous Deformation Analysis (D D A) method developed by Shi in 1988. In this method, rock masses are treated as systems of finite and deformable blocks. Large rock mass deformations and block movements are allowed. Although various extensions of the D D A method have been proposed in the literature, the method is not capable of modeling water-block interaction, sequential loading or unloading and rock reinforcement; three features that are needed when modeling surface or underground excavation in fractured rock. This paper presents three new extensions to the D D A method. The extensions consist of hydro-mechanical coupling between rock blocks and steady water flow in fractures, sequential loading or unloading, and rock reinforcement by rockbolts, shotcrete or concrete lining. Examples of application of the D D A method with the new extensions are presented. Simulations of the underground excavation of the \ulcornerUnju Tunnel\ulcorner in Korea were carried out to evaluate the influence of fracture flow, excavation sequence and reinforcement on the tunnel stability. The results of the present study indicate that fracture flow and improper selection of excavation sequence could have a destabilizing effect on the tunnel stability. On the other hand, reinforcement by rockbolts and shotcrete can stabilize the tunnel. It is found that, in general, the D D A program with the three new extensions can now be used as a practical tool in the design of underground structures. In particular, phases of construction (excavation, reinforcement) can now be simulated more realistically.

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Study on the prediction of the stopping probabilities in case of train fire in tunnel by Monte Carlo simulation method (몬테카를로 시뮬레이션에 의한 화재열차의 터널 내 정차확률 예측에 관한 연구)

  • Ryu, Ji-Oh;Kim, Jong-Yoon;Kim, Hyo-Gyu
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.1
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    • pp.11-22
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    • 2018
  • The safety of tunnels is quantified by quantitative risk assessment when planning the disaster prevention facilities of railway tunnels, and it is decided whether they are appropriate. The purpose of this study is to estimate the probability of the train stopping in the tunnels at train fire, which has a significant effect on the results of quantitative risk assessment for tunnel fires. For this purpose, a model was developed to calculate the coasting distance of the train considering the coefficient of train running resistance. The probability of stopping in case of train fire in the tunnel is predicted by the Monte Carlo simulation method with the coasting distance and the emergency braking distance as parameters of the tunnel lengths and slopes, train initial driving speeds. The kinetic equations for predicting the coasting distance were analyzed by reflecting the coefficient train running resistance of KTX II. In the case of KTX II trains, the coasting distance is reduced as the slope increases in a tunnel with an upward slope, but it is possible to continue driving without stopping in a slope downward. The probability of the train stopping in the case of train fire in tunnel decreases as the train speed increases and the slope of the tunnel decreases. If human error is not taken into account, the probability that a high-speed train traveling at a speed of 250 km/h or above will stop in a tunnel due to a fire is 0% when the slope of the tunnel is 0.5% or less, and the probability of stopping increases rapidly as the tunnel slope increases and the tunnel length increases.

Analysis of Trial Test for ATP On-board Equipment of Tilting Train (틸팅열차 ATP 차상장치의 시운전시험 분석)

  • Baek, Jong-Hyen
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.10
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    • pp.3911-3916
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    • 2010
  • In this paper we describe contents and results on running test for ATP on-board equipment, which has propelled as one of the research projects, so called, "Reliability assessment and operation technology development for Korean-type tilting trains" in order to ensure the safety and operation efficiency of tilting trains. We developed tilting trains for the speed-up of conventional lines and for the passenger service improvement where the KTX is not available. And we made progress the operation trial test in the 120,000 km distance with the use of ATS equipment, used in existing lines, for the purpose of the reliability assessment of the developed tilting trains. We decided to accelerate the speed for more than 200km/h with respect to the 6 existing lines including Jungang-line and Chungbuk-line where KTX has not operated. According to this decision, Train control system is to be changed from ATS to ATP. We should have installed an ATP on-board unit in tilting trains and verified the operational suitability, therefore we installed the same ATP on-board unit on tilting trains as that used in the ATP construction project on Gyeongbu-line and Honam-line, and verified that the function and performance of the installed ATP on-board unit conformed to the tilting trains operation.

Numerical Analysis of the Change in Groundwater System with Tunnel Excavation in Discontinuous Rock Mass (불연속 암반에서의 터널굴착에 따른 지하수체계 변화에 대한 수치해석적 연구)

  • Park, Jung-Wook;Son, Bong-Ki;Lee, Chung-In;Song, Jae-Joon
    • Tunnel and Underground Space
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    • v.18 no.1
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    • pp.44-57
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    • 2008
  • In this study, a 2D finite-element analysis, using the SEEP/W program, was carried out to estimate the amount of groundwater flawing into a tunnel, as well as the groundwater tables around wetland areas during and after a tunnel excavation through rock mass. Four sites along the Wonhyo-tunnel in Cheonseong Mountain (Gyeongnam, Korea) were analysed, where the model damain of the tunnel included both wetland and fault zone. The anisotropy of the hydraulic conductivities of the rock mass was calculated using the DFN model, and then used as an input parameter for the cantinuum model. Parametric study on the influencing factors was perofrmed to minimize uncertainties in the hydraulic properties. Moreover, the volumetric water content and hydraulic conductivity functions were applied ta the model to reflect the ability of a medium ta store and transport water under both saturated and unsaturated conditions. The conductivity of fault zone was assumed ta be $10^{-5}m/sec\;or\;10^{-6}m/sec$ and the conductivity of grouting zone was assumed as 1/10, 1/50 or 1/100 of the conductivity of rock mass. Totally $6{\sim}8$ cases of transient flow simulation were peformed at each site. The hydraulic conductivities of fault zone showed a significant influence on groundwater inflow when the fault zone crossed the tunnel. Also, groundwater table around wetland maintained in case that the hydraulic conductivity of grouting zone was reduced ta be less than 1/50 of the hydraulic conductivity of rock mass.

Analysis of Hull-Induced Flow Noise Characteristics for Wave-Piercing Hull forms (파랑관통형 선형의 선체유기 유동소음특성에 관한 연구)

  • Choi, Woen-Sug;Hong, Suk-Yoon;Song, Jee-Hun;Kwon, Hyun-Wung;Seo, Jeong-Hwa;Rhee, Shin-Hyung
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.5
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    • pp.619-627
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    • 2018
  • As ships become faster, larger and are required to meet higher standards, the importance of flow noise is highlighted. However, unlike in the aeroacoustics field for airplanes and trains (where flow noise is considered in design), acoustics are not considered in the marine field. In this study, analysis procedures for hull-induced flow noise are established to investigate the flow noise characteristics of a wave-piercing hull form that can negate the effect of wave-breaking. The principal mechanisms behind hull-induced flow noise are fluid-structure interactions between complex flows underneath the turbulent boundary layer and the hull. Noise induced by the turbulent boundary layer was calculated using wall pressure fluctuation and energy flow analysis methods. The results obtained show that noise characteristics can be distinguished by frequency range and hull region. Also, the low-frequency range is affected by hull forms such that it is correlated with ship speed.

Prediction of Broadband Noise for Non-cavitation Hydrofoils using Wall-Pressure Spectrum Models (벽면변동압력을 이용한 비공동 수중익의 광대역소음 예측 연구)

  • Choi, Woen-Sug;Jeong, Seung-Jin;Hong, Suk-Yoon;Song, Jee-Hun;Kwon, Hyun-Wung;Kim, Min-Jae
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.6
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    • pp.765-771
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    • 2019
  • With the increase in the speed of ships and the size of ocean structures, the importance of flow noise has become increasingly critical in meeting regulatory standards. However, unlike active investigations in aeroacoustics fields for airplanes and trains, which are based on acoustic analogy methods for tonal and broadband frequency noise, only the discrete blade passing frequency noise from propellers is considered in marine fields. In this study, prediction methods for broadband noise in marine propellers and underwater appendages are investigated using FW-H Formulation1B, which can consider the mechanism of primary noise generation of trailing edge noise. The original FW-H Formulation 1B is based on the pressure correlation function tolackitsgeneralityandaccuracy. To overcome these limitations, wall-pressure spectrum models are adopted to improve the generality in fluid mediums. The comparison of the experimental results obtained in air reveals that the proposed model exhibits a higher accuracy within 5 dB. Furthermore, the prediction procedures for broadband noise for hydrofoils are established, and the estimation of broadband noise is conducted based on the results of the computational fluid dynamics.