货运网络风险决策的变分不等式模型及算法  

A variation inequality model and the algorithm for risk decision-making of freight transportation network

作　　者：李方媛[1] 胡大伟[1] 

机构地区：[1]长安大学汽车学院,西安710064

出　　处：《安全与环境学报》2012年第6期173-176,共4页Journal of Safety and Environment

基　　金：国家科技支撑计划项目(2009BAG13A04)

摘　　要：以往的货运网络均衡研究注重参与者之间的利润均衡,缺少对运输安全风险因子规律的分析。针对这一问题,考虑运输安全风险成本,对托运人、承运人和运输管理者3个参与者的运营收益进行分析,提出了道路货运网络均衡的变分不等式模型,通过变步长投影算法完成优化模型的求解和验证。最后,通过使用模拟数据集揭示道路货运安全风险发生的主要规律。结果表明,该方法能有效找到运输网络利润与安全风险的均衡点。This paper intends to analyze the conditions for safety and stability development of the traffic freight network while providing guidance for the risk decision-making of the transportation safety. What we would like to do is to make our work different from the ones in pursuing the freight network equilibrium by giving more attention to the balance of the profits among the parties involved, for the previous studies failed to analyze enough of the regularities of the risk factors of transport safety. To solve this problem, we have taken into full ac- count the negative factors influencing the transportation safety, the operation profit of the three parties including the shipper, the carrier and the manager. In addition, we have introduced the risk cost con- cept for the transport safety into the positive function of the traffic freight network. Thus, we have proposed a variation inequality model of the freight network equilibrium so as to make it optimized while de- signing the projection algorithm of variable steps and working out the validation of and solution to the proposed model. In hopihg to com- pare better and verify the functions of the model, we have also used this data set to cheek out all the likely effects of the different parame- ters on the entire transportation network, which help us to reveal the main regularities of the security risks with the road freight through the simulated data sets. The application results of MATLAB procedure shows that the proposed algorithm proves to be 5 times as efficient as possible as the original algorithm. However, due to the profit margin compressed, the overloading transport has become an inevitable choice for the carrier, and the high cost has also made the inspection frequency restrained. The results of our study indicate that the key factor affecting the safety transportation is to forbid the barbarous loading-unloading and mindless transportation and exert fully qualified function of the crew-members in the transportation process. There- fore, managers should b

关 键 词：安全工程 风险决策 变分不等式 投影算法 道路货运 

分 类 号：U492.3[交通运输工程—交通运输规划与管理]