With the increasing demand for express service in the new service industries such as e-commerce and online shopping, the role of express delivery in economic and social development in the service of production and people’s livelihood is increasing.The problem of rapid growth of express delivery service is contradiction between the shortage of express service ability, and the demand for delivery efficiency and service level of express delivery is constantly improving.Important problems of the express industry in our country, is the delivery network optimization and management lags behind the pace of the growing express business, especially the problem of "the last kilometer" has not been effectively solved, express delivery model needs to be perfect.
To solve the problems existing in the express delivery system, research on optimization problem of express distribution network based on the express cabinet, the optimal configuration of the number of different specifications of the express cabinet, the optimization of distribution vehicle routing based on express cabinet are described as mathematical models and be solved by designed algorithms, and then the dynamic dispatching system and its optimization method based on the vision mode are proposed. The research results provide theoretical basis and technical support for the optimization research of express delivery system. The specific research contents are as follows:
(1) The optimization problem of distribution network layout is studied. We first to layout the express distribution centers location, and to choice the optimal solution with the grey clustering evaluation model based on triangular whitenization weight function; then for each express distribution center service scope determine express cabinet location scheme, considering factors such as the courier delivery cost and customer pick-up delivery cost, build a mathematical programming model, and to solve the model with two kinds of algorithm in three phases, and get the best location of express cabinet and the service customers division scheme, which forms the terminal distribution network including the distribution center and express cabinet.
(2) The optimal configuration of the number of different specifications of the express cabinet is studied. Considering the uncertain factors such as the delivery quantity of the package delivery, the undetermined factors of the packaging ratio and the distribution requirements of multiple batches per day, a stochastic optimization model is established. Particle swarm optimization (PSO) and Tabu search algorithm (TSA) are combined with improved hybrid algorithm to solve the model which to get optimal allocation of the number of outlets express cabinet and to reduce the influence of uncertainty on decision making.
(3) The optimization of distribution vehicle routing based on express cabinet is studied Firstly, for a specific distribution task, considering the delivery customer demand of diversity and dynamism to build a mathematical programming model. Secondly, according to complexity of the problem and the general genetic algorithm disadvantages improve the general genetic algorithm, that is, the optimal initial population firstly is obtained by heuristic method, then combining the mechanism of cellular automata with the basic principle of genetic algorithm to design the operator and become cellular genetic algorithm. Finally, the currier distribution vehicle routing optimization problem based on express cabinet is solved by using cellular genetic algorithm and the optimal solution is obtained.
（4）The future service innovation of express delivery is studied according to the development trend of mobile phone positioning technology. A dynamic express delivery system and delivery method are designed, by using the system, gain people’s travel trajectories by using mobile phone positioning and tracking system module and geographic information system, then optimize the matching calculation by the center server to match the auxiliary courier and recipient in time and place, and develop dynamic delivery scheme, assist the courier company to carry on the task assignment, then achieve the purpose of dynamic delivery.
Through the optimization research on express delivery network and distribution mode based on the express cabinet and its implementation and application of the, optimize the express logistics system, further improve the delivery service level, and strengthen the effect of express promotes to economic development.