The system is developed by ourselves on the basis of the project which is titled . multimedia broad bandwidth network engineering and been responsible by the author of this thesis . the hfc network transmission based techniques of internet dual access , user set - top - box access , stock broadcasting , standard video broadcasting , distant education , etc . are addressed . this system can provide information highway to telecommunication and tv broadcasting to run multimedia services and be suitable for the status of our nation and the economic burden of our public 本论文以作者负责的项目“山东胜利油田多媒体宽带网络工程”为背景，阐述了本单位自主开发的“基于hfc网络多媒体宽带传输系统”的原理、功能和技术特点，论述了基于hfc传输网络下的： internet双向接入技术和用户端机顶盒接入技术及股票发送、准视频广播、远程教育等高速数据广播技术在hfc网络工程中的实现，说明了该系统能够为电信和广电全面开展多媒体增值业务提供一套适合我国国情、满足我国公众经济承受能力的信息高速公路完整解决方案。
The knowledge model was developed based on the dynamic relationships between crop and environments , and quantitative representation of the temporal and spatial variation in crop growth and management indices . this provided the decision - making of dsspf with interpretation and wide applicability , thus overcoming the shortcomings of the traditional expert system with strong empiricism and localization 知识模型是基于作物与环境的动态关系，通过定量描述作物生育和管理指标的时空规律，从而使dsspf中的管理决策支持具有解释性和广适性，有效解决了专家系统决策中地域性和经验性较强的这一难题。
Abstract : the authors analyze the current status of hybrid rice breeding for superior high - yielding . the breeding strategies for superior high - yielding in hybrid rice by core approaches as the utilization of wide compatibel restorer lines and male sterile lines , construction of ideal plant type , as well as the future consideration are discussed 文摘:分析了我国杂交稻超高产育种的现状，着重讨论了以创制广亲和恢复系和广亲和不育系以及理想株型塑造等为核心的杂交稻产量超高产育种策略，并提出了今后应加强的研究内容。
Chaos is a kind of complicated oscillation , which is produced by definite system and described by nonlinear equation . it lies between cycle oscillation and noise . because of the sensitive initial value and wide spectrum , chaotic application in the field of secure communication and spread spectrum communication has already attracted people ' s eyes 混沌是非线性方程描述的确定系统所产生的介于周期振荡与噪声之间的一种复杂振荡,由于混沌信号的初值敏感性和广谱性,它在保密通信和扩频通信领域中的应用已经引起人们的广泛关注。
