粗糙集理论在立交桥方案比选决策支持的应用

立交型式选择是立交建设中重要的前期工作,立交型式不同,将使整个立交的交通功能、投资、景观及社会和经济效益等方面受到影响。本文采用粗糙集理论,通过对相同道路条件下不同立体交叉口设计方案进行粗糙集评价,建立了对已有的立交桥设计方案的评价模型,针对具体问题对冗余指标进行筛选,再根据数据自身特点赋予其权重,这种方法可以有效避免传统的主观评价和层次分析法主观确定各个指标隶属度的弊端。

Applications of Rough Set Theory on Decision Supporting for TheOverpass Scheme Selection

The type of ramps of interchange in urban road network is an essential preliminary work in interchange constructing. Different type of interchange will invole various traffic function, investment, landspace and so on. So in this paper, Rough Set Theory is used to determine the interchange type of relative interchanges. A modle of interchange type selection is built via the evaluation for different design decision in the same network conditions. Indexes are screened out by the Rough Set Theory on the consideration of specific problems. This method avoids the traditional subjective eval-uation method on determine the subjective membership index in AHP method. At last, an example is advised to solve the Rough Set model mentioned above.