Papers by Keyword: Transportation

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Authors: Chang Feng Zhou
Abstract: A problem in which a given good has to be delivered from some origins to some destinations by means of a given fleet of trucks at minimum cost is discussed. For the purpose of solution the problem is split into two levels: the decision concerns the planning of trips and the vehicles needed to operate the trips have to be scheduled. The solution approach based on Lagrangean Decomposition is presented.
Authors: Xiao Ping Bai, Lin Lou
Abstract: The materials transportation system with storage bin is widely used in mines, power plants, material yards, and etc. Bin capacity size has great influence on reliability and production efficiency of whole materials transportation system. By utilizing some existing outcomes, this paper presents a new reliability and cost-benefit integrated optimization model about storage bin capacity in materials transportation system. Compared with some existed references, this presented model fully considers different influences of storage bin capacity on reliability and production efficiency of whole materials transportation system and realizes reliability, cost and benefit overall optimization decision. All kind of factors affecting designed storage bin capacity can be easily gotten by the presented model. In addition this paper also presents a set of detailed reliability and cost-benefit integrated optimization formulas about storage bin capacity in materials transportation system. These can offer the reference for capacity decision design computing of storage bin in materials transportation system.
Authors: Xiong Xia, Ming Qing Jiang
Abstract: This paper uses vensim to establish a SD prediction model of transportation and social economy, the model considers passenger transport capacity, cargo capacity, population, GDP and other major factors. Base on data in nearly ten years, the prediction results verify S-T SD model is ture and effective,and get the time-node that the growth rate of passenger capacity satisfied the shortage of Passenger transport capacity in different sensitivity parameter A.
Authors: Gi Wook Cha, Won Hwa Hong, Jin Ho Kim
Abstract: Architecture and building industry have been made diversified efforts to create a construction environment that promotes resource recycling. Many studies have been done to better understand and reduce energy consumption and CO2 emissions throughout a building’s lifecycle. However, to promote sustainable development and a construction environment that facilitates resource recycling, more understanding and research is needed on energy consumption and CO2 emissions during the stage of dismantling a building. Noting that, this research investigates CO2 emissions in a building’s End-Of-Life (EOL) phase that includes dismantling of a building, transport and disposal of the waste generated in the course of dismantling residential buildings in Korea. According to the results of this study, CO2 emissions in a building’s EOL phase was 3,561kg CO2/100m2 for apartments, 3,184 kgCO2/100m2 for brick houses and 1,137 kg CO2/100m2 for wooden houses. The results showed that transport and disposal process of demolition waste accounts for 90% of all CO2 emissions in a building’s EOL phase. From this finding, it is necessary to have a proper, effective strategy for transport and disposal of demolition waste from dismantled buildings’ in order to reduce CO2 emissions during a building’s EOL phase.
Authors: Gi Wook Cha, Won Hwa Hong, Sung Woo Shin
Abstract: In recent year, Korea relies on imports for most of the iron ore, the main raw material of rebar, resulting in CO2 pollution with lots of energy consumption. Hereupon, this study carried out the research on the energy consumption and CO2 emissions of the recycled rebar using the wasted steel from building demolition. For that, this study worked out the energy consumption and CO2 emissions in the process of generation, transportation and production of wasted steel and, on the basis of which, it conducted the comparative study with virgin materials. The major research results are as follows: First, the energy consumption and CO2 emissions of the recycled rebar were found to be highest in the process of its production at 89.2% and 85%, respectively. In addition, in the comparison between recycled rebar and virgin material, the former was found to be most advantageous in energy consumption. On the contrary, as for CO2 emissions, the recycled rebar showed a 88.3% reduction possibility of greenhouse gas (GHG) emissions comparing to statistics of input-output analysis based on competition inducement coefficient, but it was found to be more disadvantageous from the perspective of GHG reduction than the statistics of input-output analysis based on non-competition inducement coefficient.
Authors: Gi Wook Cha, Won Hwa Hong, Sung Woo Shin
Abstract: In recent years, demolition work in Korea has been rapidly increasing, and accordingly, its environmental impact has become significant, thus requiring quantitative analysis on energy consumption and CO2 emissions generated during demolition work. This study aims to examine energy consumption and CO2 emissions in the end-life cycle of buildings. In this study, inventory analysis was conducted and basic units of energy consumption and CO2 emissions were calculated in accordance with Intergovernmental Panel on Climate Change (IPCC) guidelines published in 1996. Major findings show that 64% of energy consumption and CO2 emissions in buildings’ end-life cycle is generated in the demolition phase, and 36% in the transportation phase.
Authors: Sun Ho Ko, Hong Gun Kim, Hee Jae Shin, Hyun Woo Kim, Yun Ju Cha, In Pyo Cha, Gwang Cheol Kim, Lee Ku Kwac
Abstract: As society became more complex, the logistics also increased, demanding for logistics transport vehicles and feeder has increased. Because the self-weight of skate for cargo transport used in this study is heavy, it needs to be weight lightening. However there is a lack of capital and technology not to improve lasting. We conducted FEM studies about weight lightening applying composites on cargo transport skate and the stiffness can be obtained at the same time. However, due to the presence of discontinuities such as holes in the parts. If you are applying composite, Because this causes the degradation of the strength of the material under static and fatigue load induced stress concentration in parts. In order to examine the safety of the cargo transport skate, you must consider the impact of the static strength damage on the stress concentration because of the discontinuous parts. In this study, therefore, the cargo skate was performed to evaluate the structural analysis through the FEM analysis. As a result, it was found that CFRP compared to existing SM45C is superior 25% when considering the characteristics. It indicated the best results in about 30% of the weight lightening.
Authors: Xiu Ying Li, Rui Xu, Cheng Zhao
Abstract: Transportation vehicle tracking systems need to equip with a tracking algorithm with not only good tracking accuracy, but also fast computation speed to meet the real time changes of vehicles. l1 tracker has good tracking accuracy, but the high computational complexity limits its application in real-time systems. In order to solve this problem, this paper proposed a novel algorithm that utilize compressive sensing to reduce dimensions and improved Sparsity Adaptive Matching Pursuit (SAMP) algorithm to rebuild the coefficients of templates. The experimental results show that the l1-FSAMP algorithm not only improves the running speed, but also reduces the average tracking errors by 83% compared to the l1-OMP algorithm. The results show that the proposed algorithm is suitable for practical real-time tracking of transportation vehicles.
Authors: Yong Hua Li, Wen Zhong Zhao, Chun Ge Nie
Abstract: The hydraulic lifting system of 450t schnabel car is more complex variable geometry mechanism. A simple technique for solving variable geometry mechanism is presented. The technique is based on energy conservation principle of hydraulic lifting process. The lifting principle and geometrical models are analyzed and formulated. The lifting pressure is calculated. The static strength design and bulking stability checking are introduced for cylindrical pressure cylinder. Results show that the maximum rated oil pressure meets cylinder lifting requirement, the static strengths of cylinder and piston reach lifting safety and reliability, and anti-bulking stability can be guaranteed under the loading and working conditions.
Authors: Hwang Gu Lee, Dong Jin Kim, Jeong Whan Han, Byung Don You, Ji Young Byun
Abstract: Magnesium alloys have been well known as active metals. Thus, magnesium alloys in molten state must be handled with extreme care during melting and casting. In this study, water model experiments and numerical analyses were carried out to optimize a pipe flow that can transport magnesium alloys in molten state safely from melting to casting furnace. Especially, during a transportation of molten magnesium alloys, a flow pattern in a pipe becomes important, because the interface between air and melt can be the source of the metal oxidation, and therefore, an air/melt interface area must be minimized. For these purposes, two vessels connected with a long pipe having two elbows with different diameters and radii of the curvature were simulated as melting and casting furnace for magnesium alloys. Optimized conditions with minimized air/melt interface area for the melt transportation were discussed in several pipe configurations.
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