MPEG21--跨平台的多媒体框架

多媒体信息消费方式的变化,必然要求实现在各种不同的网络间的数据交换。MPEG21标准在这种环境下应运而生,旨在建立一种高效、透明和互操作的真正跨平台的多媒体框架。本文提出了一种基于加MPEG21的多媒体实验系统．并对MPEG21未来发展作了进一步阐述。     

地铁建设工程地下管线探测项目管理经验探讨

通过介绍深圳地铁1号线续建工程地下管线探测的一些过程和方法,和大家分享其中的几点管理经验,包括IPMP理论在管线探测项目管理中的实际应用以及如何贯彻ISO9001：2000质量管理体系等。     

A Tool Pack Mechanism for DRM Interoperability

As the number of digital content service providers increases, a variety of digital rights management (DRM) systems appear without supporting interoperability. The lack of interoperability in DRM systems causes inconvenience to customers, especially when they want to play content through multiple devices manufactured by different vendors. In this letter, we propose a novel method to support interoperability between different DRM systems. The proposed technique aims to build an open framework structure which satisfies DRM vendors' requirements by enhancing the security of intellectual property management and the protection tools.     

一种基于回归模型的路径矩阵研究

研究了相关的路径矩阵模型,提出了一种基于回归分析的路径矩阵模型,该模型的核心有三点：一是采用主动注入IPMP探测包对的方法获得时延;二是根据M/M/1排队模型采用最小二乘方法获得回归方程,避免了繁琐的计算,只需测量时延即可获得流量;三是采用主动测量方法获得路径,最终获得全网的路径矩阵。证明了该方法的有效性,并给出了仿真结果。     

关于MPEG-21知识产权管理和保护技术的研究

论述了MPEG—21标准中知识产权管理和保护(IPMP)技术的现状、主要特征、框架结构、工作机制以及未来的发展目标，其目标的实现将直接影响服务、设备和应用间的互操作性，并可在其框架结构中制作和供给内容流，动态地设计出新的服务和设备。     

Corrosion inhibition of mild steel by natural product compound

Corrosion inhibition of mild steel in H₃PO₄ containing chloride or sulphate ions have been studied using different electrochemical techniques. The corrosion and hydrogen evolution of mild steel alloy in 2 M H₃PO₄ acid containing 0.5 M NaCl can be effectively inhibited by addition of natural product compound, Thymol (IPMP), of different concentrations. However, in 2 M H₃PO₄ containing 0.5 M Na₂SO₄ corrosion cannot be effectively inhibited. The results of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements confirm the synergistic effects which describe the increase in the effectiveness of a corrosion inhibitor in the presence of Cl⁻ ions in the corrosive medium. At any temperature, an increase in it leads to an increase of the corrosion rate and hydrogen evolution on mild steel. Polarization and EIS results are in good agreement with each other. The obtained results were confirmed by surface examination using scanning electron microscope.