• Journal of the Korean Society for Railway
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• v.11 no.5
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• pp.513-518
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• 2008

Currently, urban areas face congestion problems that diminish personal mobility and freight-transport productivity. An increasing number of experts suggest that separating freight traffic from passenger traffic makes sense in terms of economics, the environment, and safety. Some experts suggest that tube transportation is the solution. The objective of this paper is to evaluate the potential benefits and limitations of tube transportation system as a viable mode of transport that can alleviate congestion on roadways. Specifically, this research employs theoretical and practical method identifying, evaluating, and selecting appropriate freight pipeline systems; evaluating the technical and economic feasibility of tube transportation; and estimating environmental, energy, and safety benefits.

• Journal of the Korean Society for Railway
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• v.18 no.5
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• pp.471-480
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• 2015

Reliance on road transport in domestic logistics can lead to intensified congestion and greenhouse gas emissions due to the rise in oil prices, any increase in logistics costs can have a high social cost. The government policy on Low Carbon Green Growth is seeking to take advantage of the railway system. However, existing railway transport logistics systems, for reasons such as low speed, low track capacity constraints, and the impossibility of implementing a Door to Door system, make it difficult to activate a railway logistics program. As a result of this study, a national R&D project to develop a High-Speed Passenger/Baggage Mixed Train(Hy-SoBex) utilizing the rail capacity constraints to overcome the difficulties of linking an air cargo and freight railway logistics system, we propose a variety of service models and select the optimal service model.

• Journal of Korea Port Economic Association
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• v.38 no.4
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• pp.119-137
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• 2022

This paper aims to confirm the necessity of the consignment system in Korea's trucking market for the purpose of analyzing the difference in perception between the transportation company and the consignment owner to provide a basis for continuous development of the cargo transportation business. A survey was conducted on the current status of the domestic transportation market with transportation companies and consignment owners, and the perceptions between the two were compared and analyzed. Overall, satisfaction with the consignment system was in the order of transportation companies handling supplies, transportation companies that did not pay supplies, consignment owners belonging to supply companies, and consignment orders belonging to non-volume companies. Similar results were obtained in individual questions. In order for transport companies and consignment owners to coexist and develop in the freight car transport market, it will be necessary to prepare a strategy to increase the satisfaction of consignment owners belonging to transport companies that do not handle relatively low-satisfaction.

• Journal of Korean Society of Transportation
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• v.23 no.2
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• pp.51-60
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• 2005

Rail-road intermodal freight transport is a transoortation system that rail and road transport are utilized between origins and destinations. The roles of road(truck) in rail-road intermodal freight transport are pick-up and delivery that are keys parts of total transportation process. The objective of this study is to develop and evaluate the pick-up and delivery strategies for container trucks in order to increase their productivity. Two different strategies are developed : One is aimed for minimizing the total traveling distance of container and the other is to reduce the waiting time at client site. The comparative studies are performed on the actual network of Paris metropolitan. The simulation analysis shows that the proposed strategies are quite efficient in various performance measures.

• Journal of Distribution Science
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• v.12 no.2
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• pp.59-71
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• 2014

Purpose - In recent years, many firms have attempted various approaches to cope with the continual increase of aviation transportation. The previous research into freight charge forecasting models has focused on regression analyses using a few influence factors to calculate the future price. However, these approaches have limitations that make them difficult to apply into practice: They cannot respond promptly to small price changes and their predictive power is relatively low. Therefore, the current study proposes a freight charge-forecasting model using time series data instead a regression approach. The main purposes of this study can thus be summarized as follows. First, a proper model for freight charge using the autoregressive integrated moving average (ARIMA) model, which is mainly used for time series forecast, is presented. Second, a modified ARIMA model for freight charge prediction and the standard process of determining freight charge based on the model is presented. Third, a straightforward freight charge prediction model for practitioners to apply and utilize is presented. Research design, data, and methodology - To develop a new freight charge model, this study proposes the ARIMAC(p,q) model, which applies time difference constantly to address the correlation coefficient (autocorrelation function and partial autocorrelation function) problem as it appears in the ARIMA(p,q) model and materialize an error-adjusted ARIMAC(p,q). Cargo Account Settlement Systems (CASS) data from the International Air Transport Association (IATA) are used to predict the air freight charge. In the modeling, freight charge data for 72 months (from January 2006 to December 2011) are used for the training set, and a prediction interval of 23 months (from January 2012 to November 2013) is used for the validation set. The freight charge from November 2012 to November 2013 is predicted for three routes - Los Angeles, Miami, and Vienna - and the accuracy of the prediction interval is analyzed using mean absolute percentage error (MAPE). Results - The result of the proposed model shows better accuracy of prediction because the MAPE of the error-adjusted ARIMAC model is 10% and the MAPE of ARIMAC is 11.2% for the L.A. route. For the Miami route, the proposed model also shows slightly better accuracy in that the MAPE of the error-adjusted ARIMAC model is 3.5%, while that of ARIMAC is 3.7%. However, for the Vienna route, the accuracy of ARIMAC is better because the MAPE of ARIMAC is 14.5% and the MAPE of the error-adjusted ARIMAC model is 15.7%. Conclusions - The accuracy of the error-adjusted ARIMAC model appears better when a route's freight charge variance is large, and the accuracy of ARIMA is better when the freight charge variance is small or has a trend of ascent or descent. From the results, it can be concluded that the ARIMAC model, which uses moving averages, has less predictive power for small price changes, while the error-adjusted ARIMAC model, which uses error correction, has the advantage of being able to respond to price changes quickly.

• Journal of Korean Society of Transportation
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• v.33 no.5
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• pp.431-440
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• 2015

This study aims to quantify the railway freight performance using various indicators, to compare it over many countries, and to evaluate efficiency of railway freight in Korea. The indicators developed in this study was classified into two categories; country-specific and company-specific indicator. The former includes freight train density, average gross train load and average haul while the latter contains revenue/ton-km, ratio of operating costs to revenue, revenue per employee, ton-km per employee, costs per ton-km and ratio of labor costs to total operating costs. The results of this study shows that Korail performance is in low efficiency due to multi-frequency small amounts transport. The productivity of railway freight in Korea represented as ton-km per employee appears to be lower than that of other oversea companies considered in this study.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.189-194
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• 2007

To reduce the cost and time of transport in Eurasian railroad networks such as TKR, TCR and TSR owing to the problem of different track gauges(narrow/standard/broad gauge), it is important to develop the gauge - adjustable wheelset system to adapt easily to these gauges. Moreover, freight trains having the gauge - adjustable wheelset will be run various curved tracks in railroad networks. Therefore, to assure the safety of the gauge-adjustment wheelset system, it is necessary to evaluate integrity of locking parts in the system using stress analysis. In this study, it was performed to contact stress analysis of locking parts by using FEA(finite element analysis) simulator during the gauge changeover operation and freight trains' service in the curved track, respectively.

• Journal of the Korean Society for Railway
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• v.9 no.4 s.35
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• pp.461-466
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• 2006

In order to transport cargo rapidly and safely from the trans-Korean railway to the trans-Siberian railway having a different gauge, a gauge-changeable freight wagon can be used. Because the wagon is expected to run in South Korea, North Korea and Russia, it should have good dynamic performance in these railways. In this paper, the dynamic characteristics of a gauge-changeable freight wagon was analyzed numerically using ADAMS/Rail in each condition of the railways having different gauges and rail profiles. The wagon makes use of load sensitive friction damping and has highly nonlinear behaviour, which is modeled in detail as the full nonlinear dynamic model. It is shown that the running behaviour of the wagon is sensitive to changes in the rail gauge and profiles, however the assessment quantities from the point of view of safety, track fatigue and running behaviour are less than the limit valves.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.11a
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• pp.349-354
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• 2004

A monitoring system for container is the positioning and managing system, which has been rapidly updated recently, for logistics in real-time. GPS is a global positioning system which is capable of positioning container promptly with a reasonable amount of accuracy. Facility managers of ports or airports should load/unload/keep freight effectively. Transport companies or freight owners should allocate moving container properly and be able to prevent or cope with the loss or delay of freight. In this study, it is monitored and tested the movement of the containers fitted with GPS, and its accuracy and efficiency is analyzed.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.98-99
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• 2017

With special condition in the geography, maritime industry is improvement rapidly in the planet, which is covered by approximately $360,000,000km^2$ of Saline water. Together with the development of this field, freight transportation industry becomes one of the most important service in the world as well as in Hai Phong. Meanwhile the number of company and quality of service increased due to the demanding of citizen, the price for this activities also raised.