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This paper introduces the vehicle routing problem of the vaccine delivery with vehicle breakdowns. In the delivery process of vaccines, a continuous low-temperature environment is required. Once any event that causes the temperature to rise happens during the whole process, the quality of vaccines cannot be assured, and even human lives that are injected by the vaccines are threatened. Therefore,...
Measuring the satisfaction is a complicated task because humans are of bounded rationality. The relationship between operational costs and passenger satisfaction has not been established neither in the definition of satisfaction based on customer perceptions nor in the studies using the definition based on specifications in operation research (OR) models. We will align the passenger requirements and...
To analyze the composition factors of difference between produce and sale (DPS) scientifically, the composition of DPS are analyzed. the measurement techniques of influence factors such as leakage rate of city pipeline, leakage rate of water second supply within inner pipeline, self usage percentage of pipeline system running, usage percentage of fire fighting, sale lose and commonweal usage percentage,...
To overcome the disadvantage of conventional fusion forecasting models, two main research ways are attempted. Firstly, the idea of the comprehensive evaluation is adopted to evaluate the forecasting models which needed to be selected by the multi-attribute comprehensive evaluation model. Secondly, the forecast precision of each forecasting model influenced by the time is compared in rationally way...
To improve government objective performance, the Shenyang's government objective performance is taken as research background, the objective performance evaluation model for government is established. On the basis of analyzing goal location for performance, the index system for performance evaluation is established, varied disposing modes driven by varied goal location for weighting coefficient and...
Focusing on the dynamic and real-time characteristics of vehicle routing problems, a knowledge representation and a modeling method for vehicle routing models are presented in this paper, so as to make a breakthrough in the aspect of modeling and solving mechanism for vehicle routing problems. According to the presented methods, a real-time modeling system for VRP is designed and set up for Shenyang...
The ant colony system (ACS) algorithm is vital in solving combinatorial optimization problems. However, the weaknesses of premature convergence and low efficiency greatly restrict its application. In order to improve the performance of the algorithm, the hybrid ant colony system (HACS) is presented by introducing the pheromone adjusting approach, combining ACS with saving and interchange methods,...
Aiming to overcome deficiencies of existing DSS for VRP, which cannot meet with real-time and online routing and scheduling, a new knowledge representation approach to efficiently eliciting domain knowledge of the vehicle routing problems (VRP) and transforming this elicited knowledge into a machine usable format is proposed. According to the characteristics of VRP, the approach contains three steps:...
From the views of emergency logistics scheduling, the disruption events during the process of logistics distribution are discussed and classified into three groups by its impacts on the status of goods, vehicles and roads, also the characteristics of the disruption events are examined. An object-oriented modeling frame of emergency logistics scheduling based on disruptions is put forward in this paper...
An ever-increasing trend in today's logistics firms is to set up intelligent scheduling system. This paper focuses on enhancing the intelligence and science of real-time optimizing scheduling of logistics distribution for e-commerce based on GIS, and discusses how to process logistics distribution knowledge visually in GIS. A model and mapping solution of logistics distribution knowledge in GIS is...
Focusing on a specific vehicle routing problem that is used in onboard and embedded equipments and incorporates road condition and its change, traffic rules and several different destinations, this paper divides the vehicle routing problem into two parts, local routing and global routing, describes the heuristic search algorithm for routing problems onboard, and defines evaluation functions for local...
Applying the theories of knowledge representation in artificial intelligence as well as knowledge engineering, this paper focuses on the properties of urban tourism recommendation of e-commerce and discusses the intelligence, science and visualization of tourism recommendation system based on WebGIS. A knowledge-based tree-like representation for the actual problems of urban tourism recommendation...
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