In order to improve the smoothness of electronic cam motion,an electronic cam trajectory generation algorithm based on global optimal control points of quintic non-uniform B-spline is prop-osed. This algorithm solves the problem of non-global optimization in existing approaches caused by transferring kinematic constraints into control point constraints to avoid the semi-infinite constraints problem. The interval ranges of the reserved free control point variables are calculated first, followed by partitioning and checking the subinterval with the property of the objective function and kinemat-ical constraints repeatedly until finding the global optimal control point. Compared with the existing control point constraints algorithm, the object function is optimized further and the electronic cam trajectory is smoother. Finally an practical example of electronic cam proves the effectiveness of the proposed algorithm.
Container Multi-modal Transport is one of Multi-modal Transport organizations that aim at realizing the best benefit of transporting cargoes. As it has remarkable advantages, container Multi-modal Transport has played an important role in international trade. This article put forward the origination model of Container Multi-modal Transport Virtual Enterprise (CMTVE) based on the conception, characteristic and adaptability of Multi-Agent technology, then it expatiated the Operational process of CMTVE. At last, this article built a CMTVE based on Multi-Agent technology to optimize the operational of container Multi-modal Transport, so it can become a flexible, dynamic, high efficient chain of transportation. Thus, this model can offer the operational optimization of container Multi-modal Transport a theory guide.
In this context, firstly, the safety evaluation index system of subway operation is established on the basis of the recognition and analysis of risk factors. Then, the paper constructs the multi-level extensible evaluation model for subway operation safety with the extension method as the core. Finally, Beijing Changping subway is studied as an example. The risk degrees of the line and its subsystems are determined. A new method for comprehensive evaluation of subway operation safety in china is put forward.
According to the selection and evaluation of railway freight transport of the third party logistics, establish a complete set of fuzzy hierarchy evaluation (F-AHP) model of railway freight third party logistics company. Taking Nanchang Train Depot as an example of empirical analysis, Calculate and screen the most appropriate third party logistics company. At the same time, we confirm the reliability and authenticity of F-AHP method that applies to the third party logistics company, which provides reference experience for the railway freight department on the selection of third party logistics companies.
Under the background of economic globalization and regional economic integration, B2C enterprises begin to focus on how to handle the relationship between logistics services and E-commerce services in the face of intense competition from other companies. This paper proposes a fuzzy analytical hierarchy process (FAHP) approach to select the logistics mode of B2C electronic commerce companies. In addition, a case study is presented to demonstrate how the approach can help in solving such problems in practice.
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