| With the enhancement of automatic and intelligentized for material handling equipments and the development of air logistics information systems, as a important link in air logistics, air freight station must be employed the advanced, rapid, accurate and highly efficient information methods in order to boost the service quality. The LEMS (logistics execution monitoring system), which is the key point of implementation for development destination on the basis of automated equipments. Therefore, took the automated devices and intelligent control system as an object, the architecture and two key technologies of LEMS were researched in detail.The LEMS is a distributed, large scale and complex software system, as a tache, which took charge the exchanging between equipment control system and cargo management system, and accepted the input of the operation, maintenance and management personnel. It's essential to research of the system architecture, cause requirements of the complex software, the practical application, the convenience of development and maintenance. The multi-layered mixed architecture and the key technologies were researched in the paper, aiming at the implementation of large scale air freight station. The software design idea of mixed multi-layered architecture for air freight station LEMS was proposed according to the scale, business volume and practical operating environment of system. The multi-layered architecture consists of presentation, facade, application service, data access, database layer; then, the B/S was combined with C/S technology, the components and the web service technology were applied to presentation and facade layer; all sorts of functions are accomplished by different layers in order to achieved the design idea and development technology, which were low coupling in interlayer, highly cohesive in layers.The order-picking optimization algorithm of automated warehouse, which achieved the goals, such as enhanced the output efficiency and optimized the storage distribution, was proposed in order to meet the requirements of current air cargo handling efficiency and fast load/unload, exchanging on shelves and cargo departing. Based on delaminating sequence method ideology, the algorithm took the "cargo shortest distance from exit" and "empty container farthest distance from exit" as principles, the perfect layout position of freight was conducted, then, the optimization of order-picking operation was performed on the basis of single sequence method, and the work efficiency of air freight station was enhanced.The graphic monitoring of LEMS is classified as graphic monitoring and storage monitoring module. In view of the differences of air freight station layout and devices, the material handling equipments and the flow of cargo delivering in air freight station are all homology, so the componentization of graphic monitoring was performed, and educed the applied component, consequently, when the personal developed the software, only needs to select the component and configure the document XML, the development of LEMS for air freight station is performed freely, and the portability, reusability and easy maintenance of system was vastly strengthened.The research results are applied to a certain large scale air freight station monitoring system, the whole monitoring system of air logistics was implemented. After a long time running, the expansibility, stability, easy use and maintainability of the LEMS is extremely stronger. The informatization level of air logistics enterprise and the visualization of logistics information are strengthened, the logistics operation costs are reduced and the handling efficiency is boosted. The system possesses perfect capability to meet the requirements of large throughput, fast and efficient air cargo logistics under the newly emerged situation. |
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