Study On Polling Service System About Unit Material Order-sorting

Under the background of mass production, big market, big circulation and big consumption, China’s national economy has shown characters of scale economies. However, the traditional "wholesale layers" of the circulation system has many shortcomings, information between poor producers and consumers, to a certain extent, affects the quality of economic development. Therefore, to build logistics distribution center for circulation system change is required, while it can meet the needs of the development under economics of the scale.Core business of the distribution center is order picking, and sorting efficiency affects the one of whole logistics distribution center directly, the faster sorting operations, the quicker orders will be produced, goods can be earlier to deliver to the customers, and satisfaction of customer can be improved.Under the background of economies of scale, the huge number of orders informs the complex systems problems for highly efficient order picking control. In-depth study of the control mechanism of order picking can be meaningful to develop the highly efficient automated sorting equipment, also improve the efficiency of logistics distribution center operations, improve the response speed of customer needs for logistics distribution center, and the service levels, while it can reduce the costs of logistics.The theory of polling provides a non-competitive access control mechanisms for rational allocation of system resources, and also an effective way to avoid conflicts between the objects involved in the competition. Especially under the high load conditions, polling can improve the utilization of the shared resources effectively. For example, in the field of communications and information network, in order to enhance the capability of control, every communication terminal has chance to access channel, to achieve the transmission delay requirements of multiple service data. By using polling multiple access communication system analysis method which is application sharing and resource sharing circuit combining to in-depth study the flow of information, also applicate research results into practical problems, effectively to allocate, manage and schedule the resource of wired and wireless network systems, which also solves lots of hot and complex issues for great concern in the field of communications and information.The flow of information is a concept of microscopic, while the logistics is concept of macro. Order picking in logistics is a kind of facility sharing and resource allocation problems in essence.This paper studies the order picking system of the unit material as a dynamic sorting system, using the theory of polling to study the problems in sorting orders of logistics, also the polling mechanism of controlling, by building the mathematical model of variety control strategies, to make the exact solution of the corresponding system parameters, to explore the development of automated sorting equipments and new ideas for controlling.This dissertation has carried on the innovative research work of the following aspects:First, the study of the integrated basic distribution centers, facilities and sorting process, discusses VC (Virtual Container, VC, virtual container) thought and process control indicators of the unit material orders, devides the process of cell division to reach the material orders VC queue, service processes of sorting machines and the sorting conversion process for each VC of sorting machines, makes given threshold, complete, qualified (k=1) control strategy into the sorting process, builds the corresponding mathematical analysis model, and gives the exact solution of the first-order system characteristic analysis (such as average queue length, average polling period), the second-order system characterization under the corresponding constraints the system stable conditions.Second, based on the differences of the logistics distribution services, divide VC queue of unit material into two levels which is an innovation, a priority queue, and the low priority common queue. Considering sorting priority service and fairness of the process, this paper innovately proposed the priority order and the general order sorting strategy to control two levels of parallel polling services-order sorting-parallel threshold polling control system completely and order sorting double parallel threshold polling control system completely, and the order sorting fully parallel- limited (k=1) secondary polling control system used in the unit material order sorting Service control. Requirement a priority is to ensure that the sorting order of preferred business customers get better QoS (Quality of Service), but also give full consideration to the service order picking of common equity, probability generating function are established system state variables, the average queue waiting for orders and the general order of priority queues captain, average operating cycle and the average waiting time for solving mathematical and other technical indicators and comparative analysis of the numerical calculations.Third, the preferred polling control mechanism in order sorting system integration as the development of application problems. Research on Active and passive polling hybrid sales visits random order acquisition system design, research and implementation of its structural pattern; Based entirely a combination of parallel sorting line threshold polling model and system characteristics control mechanism, and with the common, which is based on a combination of randomized controlled sorter cost comparison; Sorting issue orders under study online e-commerce orders and lines, dual control mechanism fully parallel polling services; Research sorting line distribution centers and more fully-qualified parallel (k=1) priority scheduling polling control model, give out the priority sorting line dual arrival rate of scheduling control generating function, find the appropriate parameters, and give out the numerical analysis.