Abstract: The paper makes two contributions to the study of A/V streaming service: (1) introduces a service management mechanism for monitoring and controlling resource utilities to enhance quality of service guarantees; (2) improves the security of A/V streaming service and reduces the complexity of encryption computations by applying CORBA security services in conjunction of the wavelet compression and encryption technology for multimedia data. An improved CORBA A/V streaming service prototype is implemented based on ORBUS which is a real-time CORBA ORB, and its application in networked manufacturing system is also discussed

Key words: CORBA; Multimedia; Streaming; QoS; Security services

摘要： 对流服务的研究提出了两点改进：(1)引入服务管理及调度选择策略，全面监控、调度系统资源的使用，增强了服务质量确保能力；(2)研究CORBA 安全服务和结合小波压缩的多媒体数据加密技术，提高流服务安全性并降低了加密计算复杂度。在ORBUS 系统上改进了A/V 流服务原型，并在网络化制造系统中加以应用。

关键词: CORBA；多媒体；流；服务质量；安全服务