In cold chain logistics, fresh agricultural products are susceptible to deteriorate due to the passage of time in the distribution process. To reduce the loss of cargo, this research integrates the traditional refrigeration cost into the freshness-keeping cost invested in the process of transportation and unloading goods. We rely on the investment of freshness-keeping cost to reduce the cargo damage cost caused by the distribution process and then propose a new vehicle routing problem (VRP). According to all relevant costs, this research builds a mathematical model with the goal of minimizing the total distribution cost. A hybrid ant colony optimization is designed to solve the problem, and the effectiveness of the model and algorithm are verified through two sets of comparative experiments. To determine which products should be invested in freshness-keeping cost to reduce the total distribution cost, we perform numerical analysis on the relevant parameters in the model. Results provide decision-making references for cold chain logistics distribution enterprises in the design of distribution routes.
Abstract. It is revealed that, on average, for each scrapped automobile, one ton of fuel oil, 1.8 tons of standard coal, 2.4 tons of scrap steel and 45 kg of non-ferrous metal can be saved. The recovery rate of end-of-life vehicles in Wuhan continues to decline, the current status of reuse is not optimistic, and research results are mostly at the theoretical level. This study quantitatively analyzed the data collected through questionnaire surveys and field surveys, and extracted five factors affecting the recovery rate of end-of-life vehicles through factor analysis and other methods:policy orientation, economic benefits, owner awareness, recycling network, operating model. Qualitative analysis of data collected using in-depth interviews, and summing up the status quo of recycling of four end-of-life vehicles through grounded theoretical coding: enterprise technology encounters bottlenecks, remanufactured product specification is not up to standard, market access thresholds are too high, and public preconceptions about remanufactured products. Based on the above research, this project summarized the problems existing in the recovery and recycling of end-of-life vehicles in Wuhan, built an integrated platform for recycling and recycling of end-of-life vehicles, and included an integrated information exchange network for end-of-life vehicle recycling, and hierarchical reuse of end-of-life vehicle resources. The two aspects of the system, and make recommendations on the main body of the government, enterprises, and the public in the platform, in order to solve the current Wuhan City scrap vehicle handling problems.
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