Duffing振子微弱信号检测方法的统计特性研究

利用混沌振子可以检测极其微弱的信号，并且具有很多优点，本文根据随机微分方程理论，通过对噪声经过Ｄｕｆｉｉｎｇ系统后统计特性的分析，确定了采用此方法检测的信噪改善比，从而为该方法的实际应用提供了指导，并且，本文针对周期系数线性微分方程的特点，提出了其输出统计特性的求法。     

发展高电压等级真空断路器的技术问题探讨

本文对发展高电压等级真空断路器的关键技术问题，如触头材料，灭弧室耐压特性、电弧特性、弧后特性、波纹管设计及触头运动特性等进行了探讨，可为高电压等级真空断路器的设计提供依据。     

基于信号合成与分离方法的数字图像灰度水印算法

根据图像DCT交流系数的统计特性，基于直流和交流信号的合成和分离方法，探索了一条频率域鲁棒水印的新思路。在载体DCT中频域中建立近似直流信号，把灰度水印图像置乱并调制成交流信号，水印的嵌入和检测过程转化为直流和交流信号的合成和分离过程。仿真分析表明，提出的算法具有嵌入水印信息量大、鲁棒性强和实现水印盲检测等优点。     

电气化铁道AT供电方式牵引回流钢轨电位的分析研究

牵引回流及钢轨电位分布,是关系牵引供电系统安全的重要数据,在高速铁路中,随着牵引负荷的增加．无砟轨道的采用,钢轨电位及电流变化很大。我国高速铁路多采用AT供电方式,有必要对AT供电方式牵引回流和钢轨电位做全面分析。该文针对电气化铁路AT供电方式,通过对牵引回路建立数学模型和计算仿真,得到了牵引回流和钢轨电位的计算公式及其分布规律,并根据分布规律提出了降低钢轨电位的措施。     

Effective improvement of high-k Hf-silicate/silicon interface with thermal nitridation

The electrical properties of polysilicon gate MOS capacitors with hafnium silicate (HfSiO) dielectric, with and without NH/sub 3/ nitridation, were investigated. The results show that with NH/sub 3/ nitridation prior to deposition of HfSiO can effectively tune the flatband voltage close to that of conventional oxide and significantly improve the leakage properties over SiO/sub 2/ (three orders reduction). Furthermore, the excellent interface quality has been evidenced by the result of immunity against soft breakdown with NH/sub 3/ nitridation.     

Optimal availability design of maintainable systems: illustrated with example of power systems

The theory of reliability optimum link allocation (ROLA) is a theory through which the ROLA in a system can be achieved in accordance with the reliability size relations of the system's links. This paper deals with its theory and application in maintainable systems after the reliability index has been extended into the availability index. In conclution its feasibility has been proved with the illustration of a pratical power system.     

三种纵向结构的AlGaN/GaN HFET性能比较

对AlGaN/GaN HFET纵向的常规结构、倒置结构和双异质结进行了研究,结果表明:常规结构的材料生长简单、容易控制,倒置结构的直流性能低于常规结构,而双异质结虽然在材料生长方面较为复杂,但它可以获得较常规结构更为优良的直流特性.     

A digital calibration technique for an ultra high-speed wide-bandwidth folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology

A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology is presented.The similar digital calibration techniques are taken for high 3-bit flash converter and low 5-bit folding and interpolating converter,which are based on well-designed calibration reference, calibration DAC and comparators.The spice simulation and the measured results show the ADC produces 5.9 ENOB with calibration disabled and 7.2 ENOB with calibration enabled for high-frequency wide-bandwidth analog input.     

TMS320VC5402引导方式的研究及其实现

TMS320VC5402的高性能、低功耗特点使其广泛适用于需要脱机运行的内嵌式系统。为实现脱机运行,其片内掩膜ROM带有一个引导装载程序bootloader,可以实现对用户程序的多种引导装载。文中介绍了TMS320VC5402片内bootloader的引导原理,给出了并行引导方式的设计方案。     

QoS-oriented packet scheduling scheme for opportunistic networks

The unique characteristics of opportunistic networks (ONs), such as intermittent connectivity and limited network resources, makes it difficult to support quality of service (QoS) provisioning, particularly to guarantee delivery ratio and delivery delay. In this paper, we propose a QoS-oriented packet scheduling scheme (QPSS) to make decisions for bundle transmissions to satisfy the needs for the delivery ratio and delivery delay constraints of bundles. Different from prior works, a novel bundle classification method based on the reliability and latency requirements is utilized to decide the traffic class of bundles. A scheduling algorithm of traffic class and bundle redundancy is used to maintain a forwarding and dropping priority queue and allocate network resources in QPSS. Simulation results indicate that our scheme not only achieves a higher overall delivery ratio but also obtains an approximate 14% increase in terms of the amount of eligible bundles.