根据随机性、时间相关、空间相关、地理受限等特性对于MANET移动模型进行了分类研究，结合 3 种实际应用，包括战场环境、事件场景、参观展览，比较移动模型与之相应的特点和适用范围，研究了移动模型混合使用的可行性。利用ANSIM 工具对其中常用的几种移动性模型进行仿真试验，比较了RW、RD、GM模型对节点平均邻居数、平均跳数、节点间连通性的影响，并进行了校园区内障碍物模型下节点移动的场景模拟。

In-vehicle networking is a method for transferring data among distributed electronic modules via a serial data bus. The classification of In-vehicle networks was introduced in this article and communication protocols such as LIN, CAN, VAN, J1850, and J1939 etc. were compared. There was a case study on character and performances of CAN protocol which is widely used in automotive industry and automation. The simulation results showed the error handling mechanism and bus load feature of CAN network. Layered-architecture of vehicle networks and protocols was explained considering communication requirement. The future trend of vehicle network communication protocols was also discussed.

该文以 IP组播技术为重点，结合网络仿真软件OPNET Modeler，分析该软件环境下 IP组播网络的建模机制，包括参考标准、组的管理、支持的应用、组播路由协议的选择，节点加入组播组与发送源发送组播数据的流程。以校园网视频会议和FTP传输应用为例，构建网络仿真模型，一方面比较单播与组播方式下的网络性能，分析了视频流量的发送情况、视频会议分组的端到端延时，FTP传输的响应时间，骨干网络点到点链路吞吐量；另一方面比较了组播方式采用共享树机制和由共享树切换到最短路径树在网络性能上的改进，包括分组延迟的降低、汇合点路由器上拥塞发生的减少等。同时，也对无线移动通信网络环境下的组播技术提出更多需要考虑的因素。

Narrowband interference (NBI) is familiar in satellite DS/CDMA systems. Frequency domain notch filter (FDNF) based on FFT was popular due to its fast arithmetic and absence of convergence time and recursive algorithm. However, at low jammer-to-signal (JSR), the bit error rate (BER) performance degrades dramatically in comparison with the matched filter (MF) receiver of the system self. In this paper, a switching metric named compression gain (CG) was introduced to force FDNF active only after certain interference power level and MF receiver active at lower JSR. By use of CG switching metric, the algorithm overcomes the threshold effect of traditional FDNF. The advantages of the improved FDNF (IFDNF) are low computational complexity and expandability due to that the decision of the domain to be used is made before the interference suppression and the inverse transform. The IFDNF based on CG metric offers better BER performance than original FDNF at lower JSR, and also outperforms the MF receiver at higher JSR. Numerical simulation results show the proposed IFDNF overcomes the threshold effect flaw and also verify the validity of the CG parameter as a switching metric.

将有代表性的移动型传感器网络协议（主要为路由协议）如 SPIN、LEACH、Directed Diffusion、PEGASIS 等的特性与适用性进行了比较。在传感器网络中，组播为节点的群组通信提供有力支持，其优势也体现在节约节点本来就很有限的能量方面。在分析移动型传感器网络协议的基础之上提出如何建立高效节能的组播体系结构，并对基于 MESH 的组播路由协议运行机制进行了仿真设计。