WAND（Wireless ATM Network Demonstrate）是欧洲ACTS（Advanced Communication Technologies and Services）支持的项目之一。在WAND中采用一种基于集线器式、自适应TDMA方式的MAC协议—MASCARA，它通过预约与竞争相结合的方法，为无线ATM（WATM）终端提供具有QoS保证的宽带无线接入。文章着重分析了MASCARA中基于时延的优先权调节调度（PRADOS）算法，并给出了几种不同情况下的算法性能仿真结果。
A new type of compact terahertz (THz) radiation source using free electron laser (FEL) is discussed in this paper.The concept machine consists of an independently tunable cell thermionic RF gun (ITC-RF Gun),an accelerating structure with symmetry RF-incoupler and a coaxial load RF-outcoupler,an undulator combined with an optical resonance cavity of hole-coupling mode.Withoutα-magnet and other bunch compressors,the size of this machine is decreased.The conceptual design and numerical simulation are presented.
提出了一种新的启发式遗传算法以求解基于非精确状态信息的QoS组播路由选择问题.该算法以基于非精确状态信息的单播QoS路由算法PC-ISI(premise-controlled,inaccurate state information)为基础,将基于非精确状态信息的QoS组播路由问题与遗传算法有机结合,通过初始群体的筛选、自适应罚函数的运用以及启发式交叉和变异等一系列策略,能有效地提高算法的搜索能力和收敛速度.仿真实验也说明该算法性能良好.
