• International Journal of Internet, Broadcasting and Communication
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• 제13권4호
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• pp.112-120
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• 2021

Recently, the number of consumers using digital online distribution platforms is increasing. This caused the rapid growth of the e-commerce market and increased delivery volume in urban areas. The logistics system, designed ar006Fund the city center to handle the delivery volume, operates a delivery system from the outskirts of the city to the urban area using cargo trucks. This maintains an ecosystem of high-cost and inefficient structures that increase social costs such as road traffic congestion and environmental problems. To solve this problem, research is being conducted worldwide to establish a high-efficiency urban joint logistics system using urban railway facilities and underground space infrastructure existing in existing cities. The joint logistics system begins with linking unmanned delivery automation services that link terminal delivery such as cargo classification and stacking, infrastructure construction that performs cargo transfer function by separating from passengers such as using cargo platform. To this end, it is necessary to apply the device to the vertical and horizontal transportation machine supporting the vertical transfer in the flat space of the joint logistics terminal, which is the base technology for transporting cargo using the transfer robot to the destination designated as a freight-only urban railway vehicle. Therefore, this paper aims to derive holistic viewpoints needs for design requirements for vertical and vertical transportation machines and freight transportation standard containers, which are underground railway logistics transport devices to be constructed by urban logistics ecosystem changes.

• International journal of advanced smart convergence
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• 제12권1호
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• pp.220-229
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• 2023

The development of logistics technology due to the 4th Industrial Revolution and logistics 4.0 has changed the logistics environment from offline to online, and the growth of the online market has accelerated due to the recent increase in non-face-to-face delivery due to COVID-19. Such growth in the online market has expanded the logistics market for delivery, and contributes to creating an advanced logistics ecosystem as last mile services and logistics technologies begin to grow together. As traffic and environmental problems arise as a result, interest in transportation means of cargo increases, and changes to cargo electric vehicles and delivery cycles are being considered. However, since mass transportation of transportation focused on terminal delivery such as cargo electric vehicles and delivery cycles is limited in handling large quantities in urban areas, methods for efficiently transporting cargo while considering the environment are being devised. In order to solve such environmental problems and increase the efficiency of logistics delivery in urban areas, technologies using underground spaces based on existing urban railroads are being developed. In this study, a study was conducted on the establishment of evaluation criteria for selecting a test bed, which is a space for applying the system.

• 한국철도학회논문집
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• 제15권4호
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• pp.394-401
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• 2012

철도는 육상수송수단으로서 18세기부터 사용되고 왔는데, 근대적 개념의 철도는 증기기관의 이용이 그 정의로 사용되며, 영국 북서부에서 Stockton & Darlington Railway가 증기기관차 운행을 개시한 것이 그 효시가 되었다. 체계화된 운행시스템을 가진 증기기관차 운행 전용철도로서는 영국의 Manchester & Liverpool Railway가 시작이다. 이러한 역사를 가진 철도는 각국에서 여러 가지 모양으로 발전되었고 시간이 지남에 따라 보존되고 있다. 특히 철도를 최초로 운영한 영국은 다양한 형태의 철도문화유산 보존체계를 가지고 있다. 또한, 아시아에서는 철도분야에서 가장 빠른 발전과 민영화 경험을 가진 일본도 체계적인 철도문화유산보존 시스템을 구축하고 있다. 본 연구에서는 영국과 일본의 양국 철도문화유산제도와 사례비교를 통해 우리나라에 주는 시사점을 살펴보고자 한다. 본 논문의 연구방법은 비교연구의 방식을 채택하였는데, 양국이 가진 법과 제도 및 운영사례 비교분석을 통해 비교와 시사점을 도출하는 방식으로 전개하였다.

• 한국안전학회지
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• 제32권5호
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• pp.141-148
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• 2017

Over the past 30 years, the business effects of the improvement project at black spot have been decreasing since 2010, with a reduction in the amount of government spending, coupled with proposing a uniform improvement plan. In order to promote more efficient improvement projects, it is necessary to evaluate the efficiency of local governments and improve the business methods of local governments with low efficiency. However, more sophisticated efficiency analysis methods are needed. Because in previous studies have been limited to the analysis of effects before and after the project through the simple before-after analysis. For this purpose, this study analyzed the efficiency of improvement project at black spot by local governments in Gyeonggi-do using DEA to compare and analyze efficiency in various fields. As a result, Goyang, Seongnam, Paju, Hanam and Yangju showed high efficiency local governments. For local governmetns with low efficiency, the improvement projets to improve efficiency were divided into civil engineering work, structure work, pavement work, additional work and transportation work, and the appropriate construction ratios of each local government were analyzed and presented.

• 센서학회지
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• 제28권3호
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• pp.171-176
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• 2019

The biomarkers related to the colorectal cancers and diseases were surveyed and summarized, and an optical electronic nose was researched and developed for their analysis. The prototyped sensor revealed that it could discriminate two gases: ethanol 2000 ppm and $CO_2$ 500 ppm. Furthermore, the sensor demonstrated the potential capability of estimation of $CO_2$ concentration with 95% confidence level. Based on the above experimental results, the developed optical electronic nose was tested with the mixtures of gases (Isopropyl Alcohol, Acetone, Methanol, and Toluene) and the biomarkers were successfully segregated using principal component analysis.

• 한국수소및신에너지학회논문집
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• 제28권2호
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• pp.174-180
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• 2017

Recently, the world faces the environmental problem such as air pollution due to harmful gas discharged from car and abnormal climate due to the green-house gases increased by the discharge of $CO_2$. Compressed Natural Gas (CNG), one of alternative for this problem, is less harmful, compared to the existing fossil fuel, as gaseous fuel, and less carbon in fuel ingredients and carbon dioxide generation rate relatively favorable more than the existing fuel. However, CNG fuel has the weakness of slow flame propagation speed and difficult fast burn. On the other hand, hydrogen does not include carbon in fuel ingredients, and does not discharge harmful gas such as CO and HC. Moreover, it has strength of quick burning velocity and ignition is possible with small ignition energy source and it's has wide Lean Flammability Limit. If using this hydrogen with CNG fuel, the characteristics of output and discharge gas is improved by the mixer's burning velocity improved, and, at the same time, is possible to have stable lean combustion with the reduction of $CO_2$ expected. Therefore, this research tries to identify the characteristics of engine and emission gas when mixing CNG fuel and hydrogen in each portion and burning them in spark igniting engine, and grasp the lean combustion limit and emission gas characteristics according and use it as the basic data of hydrogen-CNG premixed engine.

• 한국환경과학회지
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• 제23권3호
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• pp.511-520
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• 2014

The MFFn(Mass first flush), EMCs(Event mean concentrations) and runoff loads were analyzed for various rainy events(monitoring data from 2011 to 2012) in transportation area(rail road in station). The pollutant EMCs by volume of stormwater runoff showed the BOD5 9.6 mg/L, COD 29.9 mg/L, SS 16.7 mg/L, T-N 3.271 mg/L, T-P 0.269 mg/L in the transportation areas(Railroad in station). The average pollutant loading by unit area of stormwater runoff showed the BOD5 $27.26kg/km^2$, COD $92.55kg/km^2$, SS $50.35kg/km^2$, T-N $10.13kg/km^2$ and T-P $10.13kg/km^2$ in the transportation areas. Estimated NCL-curve(Normalized cumulated-curve) was evaluated by comparison with observed MFFn. MFFn was estimated by varying n-value from 10% to 90% on the rainy events. The n-value increases, MFFn is closed to '1'. As time passed, the rainfall runoff was getting similar to ratio of pollutants accumulation. The result of a measure of the strength of the linear relationship between observed data and expected data under model was good.

• Journal of Welding and Joining
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• 제35권1호
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• pp.16-25
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• 2017

Gas Metal Arc Welding is a widely used process in Industry due to its high productivity and potential to automation. The present study investigates the effects of the welding speed, arc voltage, welding current and shielding gas on the bead geometry for a low-carbon steel. The Response Surface Methodology (RSM) is used to choose an experimental design and perform test runs accordingly in order to produce mathematical models predicting the geometry, the hardness and the heat input of the bead as functions of the welding parameters. The direct and interaction effects of the four welding parameters are represented graphically and allow to determine an optimum set of welding parameters.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1177-1180
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• 2005

The Ministry of Construction & Transportation(MOCT) in Korea handles electronically 38 kinds of approval and permit operations under the Construction Civil Affairs Administration System(CCAS) so that applicants may apply for construction permits with ease and concerned public offices may process effectively civil applications. In particular, road occupation permit operations have several problems to be improved. This study is aimed to improve the CCAS in terms of simplification of application receipt, issuance of online permit, auto calculation of road occupation fee, and auto issuance of payment notice.

• 대한교통학회지
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• 제34권4호
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• pp.304-317
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• 2016

교통, 정보통신 등 기술의 발전은 물자의 흐름을 가속시켜왔으며, 지역적 범위의 물류가 국가적 범위의 물류로 확장됨에 따라 국가 물류정책에 대한 중요성은 증가하고 있다. 국내 물류시장의 급격한 성장으로 인한 물류시설의 공급부족, 물류시설의 비효율적 운영, 유통구조의 복잡성과 같은 문제를 해결하기 위해 거점물류시설을 건설하여 효율화를 도모하였으나 저조한 운영실적으로 어려움을 겪고 있다. 거점물류시설에 대하여 활성화 방안에 관해서는 많은 연구가 이루어지고 있으나 사설 물류업체와의 기능중첩에 초점을 맞춘 원인분석은 이루어지지 않고 있다. 이에 본 연구에서는 영남내륙화물기지의 기능상실에 따른 인근 물류시설과의 기능중첩과 연계체계의 불합리성에 대하여 분석 하였다. 국내 화물수송의 대부분인 육로운송에서 기능 중첩에 따른 거점물류단지 미 이용에 대한 원인을 제시함으로써 향후 국가단위 물류 인프라 정책의 측면에서 의미를 찾을 수 있을 것으로 판단된다.