计算机体系结构设计原理的易经模型

易经是中华民族宝贵文化遗产,它包含上古时期人们对自然宇宙和人生社会的思想认识、哲学理念和辩证法,代表了先民哲学地把握宇宙的思维成果.现代科学的许多重大发现和突破,如二进制、原子结构、生物遗传DNA等学科理论,都可以从八卦和六十四卦模型中发现与之对应的形态和哲学思维.计算机体系结构设计原理（PPCAD）应是易经这种形态和思维的一种自然现象和映射对象,利用八卦和六十四卦哲学思维和策略,提供PPCAD的思路和策略是本文的目标.本文依据PPCAD中的基本推演理念,提炼出4对基本对立统一推演关系,根据4对基本关系构造了新的易经八卦及六十四卦.同时,结合体系结构设计中的层次模型方法,指出了易经层次模型的特点及动态性.为了便于对PPCAD易经模型的理解,我们选择了10个新卦的例子加以说明和表达,同时也给出了一些PPCAD原则和策略的新观察.我们想指出,我们的新易经模型方法不但可用于计算机体系结构的设计,也可尝试用于其他复杂系统的设计原理.最后,对全文进行了总结,并对下一步的研究进行了展望.     

不规范I~2C接口应用导致器件损坏的研究

本文对一种不规范的I^2C应用导致器件损坏的情况进行了描述,分析了这种情况产生的原因,并给出了解决方法。     

一种多天线智能谱感知方法研究

频谱感知和多天线分集合并技术是目前无线通信研究的热点.为了在复杂的信道衰落环境下实施有效的检测,融合多种检测方法是目前频谱感知技术的发展趋势.提出了一种基于匹配滤波器检测、能量检测和循环平稳检测的多天线合并智能频谱感知算法.通过建立高斯信道下二元假设检验模型,得出了总检测概率的封闭表达式.各种条件下的检测概率和检测时间的接收机工作特性(Receiver Operating Characteristic,ROC)实验结果表明所提算法优于单天线的性能,有效地利用了分集技术并减小了信号瞬时波动,保证在衰落信道条件下也能得到较高的检测概率.这对发展新型频谱感知技术,促进认知无线电技术应用具有重要意义.     

毫米波测云雷达回波信号衰减补偿仿真研究

针对毫米波测云雷达受云雨衰减的问题,从雷达I、Q信号角度出发,模拟毫米波测云雷达回波I、Q信号并假设一定的探测环境,进行雷达回波信号衰减补偿仿真试验.试验结果表明,雷达电磁波信号穿过雨区和云区时,在远距离处衰减量很大,通过衰减补偿,信号强度明显增强,目标信号突出.     

车路通信环境下TD-LTE无线资源调度建模与仿真

为了改善现有车路通信方式覆盖范围小、交付时延大和传输速率低的现状,将TD-LTE技术引入车路通信接入系统。提出了基于TD-LTE的车路通信接入系统无线资源调度模型;构建了车路通信仿真场景,对比例公平算法、指数比例公平算法和改进的最大权重时延优先算法进行性能分析。仿真结果表明:车辆低速移动场景下,系统负载较低时指数比例公平算法性能较好,系统负载较高时改进的最大权重时延优先算法表现更优,比例公平算法不适合车路通信多媒体业务流调度;车辆高速移动场景下,三者都不适合车路通信多媒体业务流调度。     

Composition-Dependent Photoluminescence Properties and Anti-Counterfeiting Applications of A2AgX3 (A = Rb,Cs; X = Cl,Br, I)

Copper(I) halides are emerging as attractive alternatives to lead halide perovskites for optical and electronic applications. However, blue-emitting all-inorganic copper(I) halides suffer from poor stability and lack of tunability of their photoluminescence (PL) properties. Here, the preparation of silver(I) halides A₂AgX₃ (A = Rb, Cs; X = Cl, Br, I) through solid-state synthesis is reported. In contrast to the Cu(I) analogs, A₂AgX₃ are broad-band emitters sensitive to A and X site substitutions. First-principle calculations show that defect-bound excitons are responsible for the observed main PL peaks in Rb₂AgX₃ and that self-trapped excitons (STEs) contribute to a minor PL peak in Rb₂AgBr₃. This is in sharp contrast to Rb₂CuX₃, in which the PL is dominated by the emission by STEs. Moreover, the replacement of Cu(I) with Ag(I) in A₂AgX₃ significantly improves photostability and stability in the air under ambient conditions, which enables their consideration for practical applications. Thus, luminescent inks based on A₂AgX₃ are prepared and successfully used in anti-counterfeiting applications. The excellent light emission properties, significantly improved stability, simple preparation method, and tunable light emission properties demonstrated by A₂AgX₃ suggest that silver(I) halides may be attractive alternatives to toxic lead halide perovskites and unstable copper(I) halides for optical applications.     

11通道10位串行A/D转换器TLC1543及其在单片机系统中的应用

介绍一种多通道串行A/D转换器TLC1543的功能特点和工作过程，讨论了器件工作方式的选择，以及器件的工作时序，并给出了TCL1543与89C51的实际应用接口电路及软件清单。     

具有I2C/SMBus接口的风扇控制器

MAX6650/MAX6651是一种新型的风扇控制器，它使用I^2C/SMBus接口能调节监视内嵌转速计的5VDC/12VDC无刷风扇的速度，具有节约功耗，延长风扇寿命和降低噪声等优点，文中介绍该芯片的特点，原理功能和使用的注意事项。     

CAS-BUS: A Test Access Mechanism and a Toolbox Environment for Core-Based System Chip Testing

As System on a Chip (SoC) testing faces new challenges, some new test architectures must be developed. This paper describes a Test Access Mechanism (TAM) named CAS-BUS that solves some of the new problems the test industry has to deal with. This TAM is scalable, flexible and dynamically reconfigurable. The CAS-BUS architecture is compatible with the IEEE P1500 standard proposal in its current state of development, and is controlled by Boundary Scan features.This basic CAS-BUS architecture has been extended with two independent variants. The first extension has been designed in order to manage SoC made up with both wrapped cores and non wrapped cores with Boundray Scan features. The second deals with a test pin expansion method in order to solve the I/O bandwidth problem. The proposed solution is based on a new compression/decompression mechanism which provides significant results in case of non correlated test patterns processing. This solution avoids TAM performance degradation.These test architectures are based on the CAS-BUS TAM and allow trade-offs to optimize both test time and area overhead. A tool-box environment is provided, in order to automatically generate the needed component to build the chosen SoC test architecture.     

NIP型非晶硅薄膜太阳能电池的研究

采用射频等离子体增强化学气相沉积(RF-PECVD)技术制备非晶硅(a-Si)NIP太阳能电池,其中电池的窗口层采用P型晶化硅薄膜,电池结构为Al/glass/SnO2/N(a-Si:H)/I(a-Si:H)/P(cryst-Si:H)/ITO/Al.为了使P型晶化硅薄膜能够在a-Si表面成功生长,电池制备过程中采用了H等离子体处理a-Si表面的方法.通过调节电池P层和N层厚度和H等离子体处理a-Si表面的时间,优化了太阳能电池的制备工艺.结果表明,使用H等离子体处理a-Si表面5 min,可以在a-Si表面获得高电导率的P型晶化硅薄膜,并且这种结构可以应用到电池上;当P型晶化硅层沉积时间12.5 min,N层沉积12 min,此种结构电池特性最好,效率达6.40%.通过调整P型晶化硅薄膜的结构特征,将能进一步改善电池的性能.