Subset threshold autoregression

We develop in this paper an efficient way to select the best subset threshold autoregressive model. The proposed method uses a stochastic search idea. Differing from most conventional approaches, our method does not require us to fix the delay or the threshold parameters in advance. By adopting the Markov chain Monte Carlo techniques, we can identify the best subset model from a very large of number of possible models, and at the same time estimate the unknown parameters. A simulation experiment shows that the method is very effective. In its application to the US unemployment rate, the stochastic search method successfully selects lag one as the time delay and five best models from more than 4000 choices. Copyright © 2003 John Wiley & Sons, Ltd.     

Researching on quadrature conversion structures For an UWB demonstrative receiver

1. INTRODUCTION As the development of technologies of digital signal processing and integrated circuits, the structure of wireless communication system has been improved. Many schemes for software defined radio (SDR) systems have been developed since 1995, and they can be divided into five tiers of solutions according to their developing history and their definitions[1]. The five tiers are conventional hardware-implemented scheme; software-controlled radio scheme; SDR, that implements m…     

水下潜器三维成像数字传输测试系统研制

采用计算机接口、软硬件相结合的方法对水下潜器三维成像数字传输测试系统进行设计。误码检测电路是由ISA总线并配以相应的外围电路构成的号虑到系统应用的通用性，测试信号的码速范围设计为40～125Mbps，另外还介绍了硬件、软件的设计原理以及系统实验。     

浅析普通机床的数控改造

论述了普通机床数控改造的可行性、必要性和经济性，并对C620-1型普通机床的数控改造过程进行了较详细的总结和论述，对普通机床的数控改造具有实际的指导作用。     

21世纪党校图书馆工作面临的挑战与对策

针对21世纪党校图书馆工作面临的挑战与目前的现状，提出了适应时代新要求的党校图书馆工作管理的对策。     

磁控式异步电动机软起动器的开发与应用

详细介绍了将传统磁放大器用于异步电机降压起动、实现软起动功能的原理以及实际实现线路，是异步电机减压软起动技术领域的一项创新。     

数字电视的发展与展望

作者以垣曲县为实例对数字电视目前的状况及发展趋势作了详细的叙述，并介绍了数字电视的各种不同标准。进而总结出了适合中国数字电视发展的途径。     

Rare Earth Doped Polymer Waveguide Materials and Devices

1 Results Rare earth doped waveguide amplifiers and devices have been demonstrated in silica, crystal and other glass hosts. These rare earth doped optical waveguide devices are based on inorganic materials. Many processing steps are required and can lead to long fabrication time and low yield.Polymer materials offer many distinct properties compared to inorganic materials, such as ease of fabrication, low production costs, simple processing steps, and compatibility with micro-fabrication technologies. ...     

西藏公务员工作满意度调查与分析

通过对西藏公务员工作满意度的调查,分析影响西藏公务员工作满意度的主要因素以及工作满意度体现在人口统计变量上的差异,并对此提出相应的对策建议。     

对数字图书馆虚拟参考咨询服务的研究

论述了党校图书馆数字化建设的现状,提出了党校图书馆实现虚拟参考咨询服务的对策。