• Title/Summary/Keyword: Railways

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Evaluation of Environmental Contribution to the Effect of Reducing Carbon Dioxide Emission in Metropolitan Urban Railways (수도권 도시철도의 이산화탄소 배출량 절감 효과에 대한 환경 기여도 분석)

  • Joo, Jaemoom;Hong, Kiman;Hong, Youngsuk;Kim, Teagyun
    • Journal of the Society of Disaster Information
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    • v.18 no.3
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    • pp.589-599
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    • 2022
  • Purpose: The purpose of this study is to quantitatively identify the environmental contribution generated by urban rail users in the metropolitan area. Method: As for the analysis method, the mode choice and assignment of the traffic demand analysis were repeatedly performed on the assumption that each line was not opened for the metropolitan urban railway lines 1 to 9. After that, the environmental contribution according to changes in demand for the road was analyzed. Result: The total amount of carbon dioxide emissions and benefits were found to be the largest for subway line 1. However, when considering the number of stations and length, it was analyzed that the environmental contribution was the greatest in Metro Line 4. Conclusion: Measures to promote the use of public transportation are representative of environmental improvement policies, but there is a limit in that it is difficult for actual users/non-users to feel it. Therefore, it is judged that it is necessary to quantitatively present the effect in order to improve and spread awareness of the environment.

Static Analysis and Improvement Opportunities for Open Source of UAV Flight Control Software (무인비행체 비행제어 Open Source 소프트웨어에 대한 정적분석 및 개선방안)

  • Jang, Jeong-hoon;Kang, Yu-sun;Lee, Ji-hyun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.6
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    • pp.473-480
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    • 2021
  • In this paper, We analyze and present improvements to problems in software quality through Static Analysis for Open Source, which is widely used as the Flight Controller software for small unmanned aerial vehicle drones. MISRA coding rules, which are widely applied based on software quality, have been selected. Static analysis tools were used by LDRA tools certified international tools used in all industries, including automobiles, railways, nuclear power and healthcare, as well as aviation. We have identified some safety-threatening problems across the quality of the software, such as structure of open source modules, analysis of usage data, compliance with coding rules, and quality indicators (complexity and testability), and have presented improvements.

Strength and Durability Test of Rapid Hardening Composite Mat for Protect Railway Slope in Operation (운영중인 철도비탈면 보호를 위한 초속경 복합매트의 강도 및 내구성 실험)

  • Hyun-Sang, Yoo;Tae-Hee, Kang;Hyuk-Sang, Jung;In-Chul, Back
    • Journal of the Korean Geosynthetics Society
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    • v.21 no.4
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    • pp.79-91
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    • 2022
  • Recently, the frequency of damage to slopes for highways, railways, and complexes has been increasing according to abnormal climates such as heavy rainfall or snowfall. Rapid Hardening Composite Mat (RHCM) could be a satisfactory alternative because it has the advantages that large-scale earthwork is not essential and the period for restoration is minimized. Also, this method does not require heavy machines and a phase of maintenance for slopes against the shotcrete method or planted slope protection, which are representative slope protection methods. Furthermore, the curing time is shorter than Geosynthetic Concrete Composite Mat (GCCM). Therefore, RHCM could be useful for emergency restoration work. Thus, in this study, the strength and duration of RHCM are estimated, compared, and analyzed with GCCM. As a result of the laboratory test, the strength of RHCM is greater 51%, and the duration is larger 69% than GCCM.

A Study on the Establishment of Education and Training Program for Urban Air Mobility(UAM) Pilot in Korea (국내 도심항공모빌리티(UAM) 조종사 교육·훈련제도 수립 방안 연구)

  • Young-jin Cho;Chul Park;Se-Hoon Yim
    • Journal of Advanced Navigation Technology
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    • v.27 no.4
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    • pp.330-336
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    • 2023
  • Rapid urbanization is rapidly progressing around the world, and urban problems such as traffic congestion, environmental pollution, and noise pollution are emerging, due to this urban concentration phenomenon, logistics and transportation costs are increasing. Urban Air Mobility(UAM) is a three-dimensional futuristic urban transportation that is expected to become an important transportation axis of smart cities as a service(MaaS) linked to roads, railways, and personal transportation. However, as of July 2023, research on airspace systems, Bertieport design, navigation, and communication for UAM operation is actively being conducted, but little research has been conducted on the concept of pilot education and training and education and training programs. Therefore, this paper aims to present a suitable plan for the domestic pilot training system through SWOT analysis of vertical takeoff and landing(VTOL) pilot education and training programs in the United States and Europe.

Frost Heave Force of Ground and Countermeasure for Damage of Structures (지반의 동상력과 구조물의 피해대책)

  • Rui, Da-Hu;Teruyuki, Suzuki;Kim, Young-Su
    • Journal of the Korean Geotechnical Society
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    • v.23 no.5
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    • pp.43-51
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    • 2007
  • Frost action may cause extensive damage to building, structures, roads, railways and utility lines in seasonal frost. The research about frost heave of natural ground has been considerably performed. In late years various structures have become complicated with the development of social infrastructure maintenance. Therefore countermeasure to frost heave becomes a matter of great importance from a new viewpoint. This study was aimed at catching natural ground frost heaving force quantitatively. Frost heaving forces on circular steel plates which were set on ground surface were measured in field test. The frost heaving forces arise at freezing front propagates to the structures through frozen soil layer. Besides, a full scale model of multi-anchored retaining wall was installed in field, and the freezing lines, frost heave pressure to act on a wall block, and so on were measured. Finally, the position and shape of frost line were estimated by using numerical simulation and a method to determine replacement range was suggested with soil properties and weather data.

Analysis of Institutional Limitations on Evacuation of Urban Railway Station Facilities and Guidelines (도시철도역 시설의 피난에 대한 제도적 한계점 분석과 가이드라인)

  • Yekyeong Shin;Okkyung Yuh
    • Journal of Korean Society of Disaster and Security
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    • v.15 no.4
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    • pp.1-9
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    • 2022
  • This study analyzes the institutional status related to 'evacuation' and 'firefighting' in underground subway stations, derives institutional limitations for 'evacuation' in underground subway stations, and proposes guidelines in terms of architectural space based on this. As a result of the study, the following points were derived. First, since similar standards are separately enacted in individual laws and it is difficult to grasp the standards and they are dualized, it is necessary to standardize and regulate the space where users stay according to the movement of urban railway users, limited to urban railways. Second, in order to use trains, a special procedure called 'ticketing' must be considered, and regulations on evacuation safety zones and evacuation stairs between the waiting room and the platform are required. Finally, if there is a platform at a depth of more than 30m underground, it is necessary to install an evacuation floor in accordance with standards similar to the current building law.

A Study on Relationship between Structural Safety and Maintenance of Derailing Prevent Guard Rail (탈선방지 가드레일의 구조안전성과 유지보수 상관성에 관한 연구)

  • Jung-Youl Choi;Hyeon-Yo Park;Jee-Seung Chung
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.4
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    • pp.593-599
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    • 2023
  • There is risk of derailment due to various factors such as vehicle-track load imbalance in curved parts, so urban railways install and operate derailing prevent guard rails. The angle-type derailing prevent guard rail is composed of various parts including the guard angle. Even if derailment does not occur, various damages occur in the components, so continuous maintenance is required. Through the damage status analysis, the components of the angle-type derailing prevent guard rail with high damage frequency were classified, and conditions for the occurrence of various damages were investigated. In addition, a numerical analysis using a precise 3D numerical model was performed to analyze the cause of the damage analytically. In order to analytically simulate the derailment situation, the static ultimate load condition was applied, and the actual drawing of the angle-type derailing prevent guard rails, rails, and wheels was used for modeling. By analyzing the results of the damage status investigation and finite element analysis, we tried to investigate the damage of the components.

A Fundamental Study on the Criteria of Basic Parameters for Planning Rock Grouting (암반 그라우팅 주요 계획인자의 기준값에 관한 기초연구)

  • Kim, Jongmin;Lee, Eung Ki
    • Journal of the Korean Geotechnical Society
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    • v.38 no.2
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    • pp.15-27
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    • 2022
  • Despite the increasing applicability of rock grouting as a method for strengthening or disaster prevention by improving the stability of ground, criteria for planning parameters which can be used as minimum guideline are required since the current practice is mainly dependent on experience. In this study, the fundamental criteria for important parameters of rock grouting in terms of injection conditions such as water-cement ratio, injecting pressure, cement take and resulting effects such as deformation modulus and permeability are proposed. Those criteria are the results of analyses of a series of hydraulic fracturing tests and Lugeon tests, in-situ grouting tests at 17 sites in Korea and other countries, combined with the literature analyses of standards and previous research. In addition, the method for modifying proposed criteria according to water-cement ratio is also addressed since that in Korean practice is too high and therefore, should be adjusted to satisfy the conditions of balanced stable grouting. The results of this study can be used as a fundamental reference for more refined research in the future although they are still somewhat experience-dependent.

Predicting Long-Term Deformation of Road Foundations under Repeated Traffic Loadings (반복 교통하중에 의한 도로지반의 장기변형 예측)

  • Park, Seong-Wan;An, Dong Seok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.5D
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    • pp.505-512
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    • 2010
  • Generally, the repeated traffic loading condition should be considered to predict the long-term deformation on road foundations or foundation systems. However, it is not easy to estimate long-term deformation on multi-layered system like roads and railways. For more quantitative analysis, mechanistic-empirical approach requires proper analytical tool, material's model, and material properties of foundation geomaterials under both traffic and environmental loadings. In this study, therefore, laboratory data from the long-term repeated load triaxial tests were used to predict accumulated deformation on pavement foundations and the results were analyzed based on the nonlinear models and stress state considered. All these results are presented and verified on laboratory based scale using the finite element analysis with the deformation characteristics of foundation geomaterials at various stress states.

Developed using Quadcopter Crop Protection and Monitoring System from Wild Animals (쿼드콥터를 이용한 야생동물로부터 농작물보호 및 감시 시스템 개발)

  • Lim, Hyeon-Woo;Jie, Min-Seok;Choi, Won-Hyuck
    • Journal of Korea Entertainment Industry Association
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    • v.10 no.4
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    • pp.303-310
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    • 2016
  • Due to population explosion and develop of the industry, expressways, national roads and railways has been developed a lot. But it increased the disconnection of the ecosystem. The phenomenon of wild animals' habitat simplification has been increased. The damage appeared in succession because of the harmful wild animal. Our country is making efforts relief of some affected farming household's financial compensation. But the affected populations can't sleep at night or they are suffering in their basic life because of this kind of night patrol. This research is based on the study of wild animal's ecosystem and their habits, generate and regenerate supersonic waves and infrasound, prevent wild animal's approach to some extent and stop the approximation effectively, focusing on develop a quadcopter about discrete pulses system.