针对目前不同Web服务注册管理标准之间(如UDDI,ebXML等)无法进行互操作的问题,运用元模型互操作框架(metamodel framework for interoperability,MFI)和本体技术,建立了一种支持语义互操作的Web服务注册管理模型的体系架构,运用MFI中的本体演化规则保证了本体在演化前后的一致性,从而保证基于本体的不同Web服务注册库的互操作性.构建了一个基于MFI的Web服务注册管理模型的原型系统,实验结果表明该原型系统的Web服务查全率比单一Web服务模型高.
This paper proposes a new combined cellular automaton (CA) model considering the driver behavior of stochastic acceleration and delay with the velocity of the preceding vehicle and the gap between the successive vehicles based on the WWH model and the noise-first NaSch model.It introduces the delay probability varying with the gap,adds the anticipation headway and increases the acceleration with a certain probability.Through these simulations,not only can the metastable state and start-stop wave be obtained but also the synchronized flow which the wide moving jam results in.Moreover,the effect of stochastic acceleration and delay on traffic flow is discussed by analyzing the correlation of traffic data.This indicates that synchronized flow easily emerges in the critical area between free flow and synchronized flow when acceleration and delay are synchronized or their probability is close to 0.5.
