关于RSA公钥体制中小解密指数攻击的讨论

在本文里,我们简单地分析了Wiener对RSA公钥系统的小解密指数的连分数攻击,并同样对他的结果进行改进,得出当解密指数d<2.9105N0.25时,系统仍是不安全的.     

传输线集总模型的严格理论推导

借助于负的集总电阻、电感、电导和电容的感念,本文建立了传输线系统的电路模型、双端口π型网络和T型网络模型。从传输线的N段梯形等效电路出发,应用连分数理论,获得了输入阻抗在输出端三种状态下(短路、断路和匹配)的表达式,进而得到了以集总参数RLGC给出的 表达式。再依据传输线的输入导纳公式、导纳矩阵和BACD矩阵,建立了传输线的集总电路模型、π型网络和T型网络模型,并分别在时域和频域进行了验证。     

基于安匝和的隔离式开关变换器霍普夫分岔与准周期现象研究

本文以电压模式控制反激式变换器为例,研究了隔离式开关变换器的霍普夫分岔与准周期现象。基于安匝和建立系统的离散映射,运用频闪采样得到以控制周期为分岔参数的分岔图。在电流连续模式下,运用特征值法判断平衡点的稳定性及其失稳过程中的霍普夫分岔。提出变压器存在时系统自然周期的正确表达,并解释分岔时系统自然周期和控制周期与特征值的关系。分析了准周期和锁频现象的演化过程并运用转数加以区别。数论理论中的法里原理、魔梯现象和准周期转数的连分数表达在反激式变换器分岔过程中的体现也得到研究。最后,实验验证了理论分析的正确性。     

电气和电子工程用材料科学

TG1112006030109钢铁材料中刃位错与溶质原子的交互作用/张国英,刘春明,张辉,赵子夫(东北大学材料与冶金学院)//东北大学学报(自然科学版).―2005,26(10).―972～974.通过计算机编程建立了钢铁中铁素体相中的1/2[111]刃位错的原子结构模型,用实空间的连分数方法计算了碳、氮及合金元素在完整晶体及位错区引起的总结构能和环境敏感镶嵌能,讨论了碳、氮及合金元素在位错区的偏聚及交互作用。计算结果表明:轻杂质C,N易偏聚于位错芯处;强、中碳化物形成元素(Ti,V,Nb,CT)易偏聚于刃位错线上,非碳化物形成元素Ni偏聚于位错线下方的弹性扩张区;…     

硅中层错带中空位的电子态

计算了硅中带状层错中的空位电子态，所使用的Ｒｅｃｕｒｓｉｏｎ方法是建立在原子轨道线性组合法的基础上，考虑了ｓ－ｐ－，ｄ－型十个原子轨道．用Ｌａｎｃｚｏｓ法得到了带隙及带连续态中的电子态，局域态密度是用连续连分数来表示的．硅中理想空位的三重简并态分裂为三个能级．从价态顶算起，它们的能量分别为－０．３，０．３，１．７ｅＶ．价带顶之上０．３ｅＶ的带隙态同纯层错中发现的电子态相似，但局域态密度要高一些．价带顶之上１．７ｅＶ的在导带中的电子态是一个强共振态．价带顶之下０．３ｅＶ的价带中的电子态则是一个弱共振态     

得胜：从广东制造走向世界品牌——专访广东得胜电子有限公司总经理杨志豪

在第十七届中国国际专业音响、灯光、乐器及技术展览会的五号馆,有一个布置精致、宽敞明亮的展台,这就是著名的广东得胜电子有限公司展台.展区的外面,是得胜公司推出的"集成应用"系统方案的宣传画.进入展区,整洁的展台上按产品类别展示着得胜牌传声器、耳机、扩音器及科声产品.透明的玻璃演出间,乐队正在里面投入地演奏.展区中得胜公司的工作人员正在接待来参观的客人.     

奢华闪亮Bling Bling——明基T800 Bling Bling限量版

大大的眼睛、白皙的皮肤、可爱笑容的非主流照片是众多MM们的最爱,因为每个女孩都梦想成为芭比娃娃一样的公主。看到明基(BenQ)T800的第一眼便会被它简洁的外观和柔和的线条所吸引,酒红色版本的T800如同红色玫瑰一样散发着公主般高贵、典雅的气质,更不失情人节的浪漫温馨。而全新上市的Bling Bling限量版T800在水钻的衬托下更加闪亮迷人!     

新技术将给世界带来什么

在未来的5到10年中,新技术将给世界带来什么变化? 我和英国的布莱尔、德国的总理、印度的辛格总理,还有美国的一些政府高官,保加利亚、约旦政府的领导等全球很多政府的代表进行讨论,问他们对新技术的看法是什么.     

基于缓冲区读取的数据源FILTER的设计与实现

DirectShow是微软公司提供的一套在Windows平台上进行流媒体处理的开发包,与DirectX开发包一起为多媒体流的捕捉和回放提供了强有力的支持,DirectShow是基于一种叫做Filter的组件进行开发和设计的,微软公司提供了许多的数据源Filter以供使用,但是却没有提供对于基于缓冲区中读取数据的Filter阐述了如何利用DirectShow技术来开发和设计这种从缓冲区读取数据的Filter,以方便对多媒体数据的处理.     

提高ADC性能的研究

ADC是CCD相机的关键器件之一,在电路中起着承前启后的作用.本文从ADC的原理和电路应用出发,分析了影响ADC性能的因素,结合CCD相机的开发的实践,给出了改善或提高ADC性能指标的方法和建议.     

CONTINUED FRACTION TACTICS FOR CRYPTANALYSIS

The continued fraction tactics for cryptanalysis based on Legendre Theorem ofcontinued fraction are proposed.     

超脉冲和连续式CO-2激光治疗腋臭疗效观察

目的:观察超脉冲和连续式CO2激光对腋臭的治疗效果。方法:超脉冲CO2激光治疗腋臭50例,并以CO2激光治疗作为对比。结果:超脉冲CO2激光治疗总有效率86%,CO2激光治疗总有效率80%。结论:两者治疗效果相当,但超脉冲CO2激光伤口愈合快,副作用小。     

Nested-feedback-loops realization of 2-D systems

Algorithms are derived for representation of double power series by branched continued fractions. Some properties of the branched continued fractions are given. Two new alternative structures for realization of a two-dimensional, zero memory nonlinear transfer characteristic are proposed. These structures permit the design of 2-D systems with relatively low sensitivity of the transfer function to coefficient errors. Generalized equivalence transformations of branched continued fractions are also presented. Illustrative examples are included.     

Two-dimensional modified Cauer form: circuit and state space realisation

A new two-dimensional (2-D) continued fraction expansion, based on the modified Cauer form, has been formulated. Moreover, a minimal state space model realisation has been derived, based on its signal flow graph, using the proposed 2-D continued fraction expansion.<>     

Continued fractions and Berlekamp's algorithm

Theorems are presented concerning the optimality of rational approximations using non-Archimedean norms. The algorithm for developing the rational approximations is based on continued fraction techniques and is virtually equivalent to an algorithm employed by Berlekamp for decoding BCH codes. Several variations of the continued fraction technique and Berlekamp's algorithm are illustrated on a common example.     

A matrix method for continued fraction inversion

Previously used methods for converting a continued fraction function into a rational transfer function have been restricted to a special kind of continued fraction. This letter presents a method for inverting a general fraction; each partial quotient including the remainder could be a polynomial of s or s^-1or both.     

Technology '89: solid state

Developments in solid-state technology during 1988 are discussed. The pace was set by memory integrated circuits, with the proliferation of flash E²PROMs (electrically erasable programmable read-only memories) and the announcement of prototype 16 Mb dynamic RAMs (random-access memories). Analog integrated circuitry continued its mild renaissance, as methods of combining analog and digital devices on the same chip where further explored and refined. Chip makers continued to find paths around roadblocks to high integration, breaching the 1-μm barrier. On the business front, the semiconductor market was more profitable than it has been in some time, and there were a number of significant mergers, and international competition continued to be tense     

Realization of two-dimensional recursive digital filters using the mixed Cauer form†

The application of the mixed cauer continued fraction expansion to synthesis of two-dimensional recursive digital filters is presented. Examples are provided to show how to perform a mixed cauer expansion on two-dimensional transfer functions and eventually obtain canonic digital ladder filter structures. Furthermore, a test for two-dimensional mixed-cauer continued fraction expansion which at the same time determines the expansion coefficients is included.     

Waveform analysis of jitter in SRTS using continued fraction

This paper presents a method to analyze jitter waveform in synchronous residual time stamp (SRTS) using continued fraction. It is shown first that the jitter waveform can be decomposed into triangular wave components and that each component corresponds to a rational approximation value of a parameter called residue. Next, quasi-simple continued fraction expansion of the residue is defined to obtain rational approximation values of the residue in a systematic manner. This method gives a series of rational approximation values of the residue. It corresponds to the decomposition of the SRTS jitter waveform into triangular wave components. Many characteristics of the jitter waveform are derived by the quasi-simple continued fraction expansion of the residue. Especially, the average amplitude and period of each triangular wave component are given     

Technology 1992-test and measurement

Noteworthy developments during 1991 are summarized. The rise of RISC put new demands on logic analyzers. Instruments relied less on PCs and more on multiple microprocessors for intelligence. Testability issues continued to grow in importance, with a strong focus on boundary scan methods. In the standards area, work continued on intrinsic, or quantum, standards, with ion cooling and laser trapping coming to the fore as promising techniques