Studies on Networking and Performance Evaluation Methods for Information Flows

1.为了发展基于CSMA/CD的局域网互连网络的性能评估技术，研究了这类网络的脱离过程。导出了网关缓冲区大小与报文丢失率、互连局域网整体性能以及具有优先级的报文行为之间的关系，从而为系统的分析、设计和评估提供了有效的方法.对于轮询系统，研究了消息离开过程、非对称轮询系统和输入相关的轮询系统，给出了有效的分析、设计和评价方法.研究了考虑网络传输延迟影响的多版本分布式数据库系统。应用网络理论对一些并发控制算法进行了性能评估.研究了混合CSMA/CD系统和多信道时隙ALOHA系统，给出了它们的性能评估方法。

1. In order to develop performance evaluation techniques of interconnected networks of LAN's with CSMA/CD, departure processes from this type of networks are studied. The relations between gateway buffer size and message loss ratio, overall performance of interconnected LAN's and the behavior of messages with priority are derived so that effective methods of analysis, design and evaluation of the system are developed.2. For polling systems, message departure processes, asymmetric polling systems and systems with correlated input are studied and effective methods of analysis, design and evaluation of them are derived.3. Distributed database systems with multiversion are studied considering the effects of transmission delay in the network. Performance evaluation of some of the concurrency control algorithms are carried out with applications of queueing network theory.4. Hybrid CSMA/CD systems and multichannel slotted ALOHA systems are studied and performance evaluation methods for them are derived.