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In theoretical cryptography, one formalizes the notion of an adversary's success probability being ``too small to matter' by asking that it be a negligible function of the security parameter. We argue that the issue that really arises is what it might mean for a collection of functions to be ``negligible.' We consider (and define) two such notions, and prove them equivalent. Roughly, this enables us to say that any cryptographic primitive has a specific associated ``security level.' In particular we say this for any one-way function. We also reconcile different definitions of negligible error arguments and computational proofs of knowledge that have appeared in the literature. Although the motivation is cryptographic, the main result is purely about negligible functions.  相似文献   

3.
常彦勋 《通信学报》1994,15(1):62-65
本文讨论了M序列的自相关性,并证明了:当0<|t-2^n-1|≤[n-1/2]时,|CM(t)|≤2^n-1。  相似文献   

4.
介绍了一种用FET作为开关的高性能PIN开关调制器的工作原理和设计方法。给出了实际应用调制器的波形。  相似文献   

5.
In this note, it is proved that for each odd positive integer n there are exactly two n-variable symmetric Boolean functions with maximum algebraic immunity.  相似文献   

6.
This letter introduces new algorithms for passivity verification and compensation of macromodels constructed from delayed rational functions in the scattering domain. For passivity verification, a frequency-dependent generalized eigenvalue is formulated, which is used to accurately determine the regions of passivity violation. For passivity compensation, first order perturbation theory is used to iteratively perturb the residues of the system until passivity is achieved. Numerical results validating the proposed algorithms are presented.  相似文献   

7.
In this paper a straightforward z-domain procedure for realizing multidimensional transfer functions with either numerator or denominator polynomial separable is presented. This procedure yields structures with minimum number of multipliers. It is shown that the number of delay elements can be reduced by selecting the optimum values for certain parameters. To facilitate this theorems that are applicable for some special cases are presented.  相似文献   

8.
A symmetrical cascade of N commensurate transmission lines having equal ripple performance over a passband centered at the quarter-wavelength frequency may be synthesized using Achieser (or Zolotarev) polynomials for N odd. This correspondence identifies the solution of the case where N is even, and a new class of functions which complement these polynomials is identified.  相似文献   

9.
This letter introduces a new method for compact macromodeling of high-speed circuits with long delays, characterized by tabulated time-domain data. The algorithm is based on partitioning the response and subsequently approximating each partition with a low-order sum-of-exponentials, delayed in time-domain. This results in a compact low-order macromodel in the form of delayed-differential equations, which can be efficiently analyzed using SPICE like simulators.  相似文献   

10.
For pt.I see ibid., vol.9, p.13-15, (2006). In this article the author has listed the basic steps in computing the inverse Laplace transform of a rational function H(s).  相似文献   

11.
The results of Chebyshev in the theory of approximation find wide application in the design of circuits and microwave components. Part of the comparatively unknown work of Zolotarev and Achieser which has found useful applications in the design of certain microwave components, especially of mixed lumped/distributed components, is described. Several new results are presented, including formulas which enable the approximation functions to be computed in a relatively simple manner.  相似文献   

12.
A computer program is described for the preparation of decision tables (based upon observed statistics) for diagnosis. The procedure does not depend upon the assumption that symptoms occur independently. The program is intended for preliminary diagnosis or screening, therefore it should have value as a device of preventive medicine. This program is available from SHARE as HO BC CRIT.  相似文献   

13.
一种正交多项式混沌全局建模方法   总被引:1,自引:0,他引:1       下载免费PDF全文
本文研究了一种正交多项式混沌全局建模方法 ,所用正交多项式集以吸引子不变测度为核 .通过对H啨non映射数据和电离层参数实测数据的分析 ,表明在待建模系统不很复杂时 (其内在机理可用较低阶多项式表达 ) ,这种全局建模方法能得到系统动力学特性 .在低噪声情况下模型还能充分精确地重构系统方程式 .在噪声较大或系统内在机理很复杂时建模结果仍可用于一步预测 ,且具有较好效果  相似文献   

14.
Discrete polynomials of special type are widely used in digital filter design, signal processing, image processing, and control systems[1]. Haddad et al. introduced binomial sequences to synthesize digital filters for signal and image processing[2-3]. Aburdene et al. shown a method for computing discrete polynomial (Hermite, binomial and Laguerre) transform representation using binary matrices and flow diagrams[4] and developed a new discrete transforms using Pascal polynomials for applicatio…  相似文献   

15.
A planar structure monolithic optoelectronic integrated circuit (OEIC), comprising an InGaAs PIN photodiode and an InGaAs junction field effect transistor (JFET), has been developed. A cutoff frequency of 1.3 GHz has been successfully obtained. A low dark-current characteristic has also been obtained by polyimide passivation. Design principle, fabrication procedures, and operation characteristics of the PIN/JFET are described.  相似文献   

16.
提出一种改进的PIN二极管子电路模型。该模型能够反映PIN二极管的瞬态开关特性,将基区电导调制效应考虑在内。通过PSpice软件瞬态仿真PIN二极管的正向直流、反向恢复特性。利用该子电路对新型SiC材料PIN二极管建模仿真,仿真结果表明运用新材料对二极管开关性能有显著提高。  相似文献   

17.
RFI effects on PIN diodes were studied experimentally for various light powers. It is shown that by operating a diode in a photovoltaic mode it is much more susceptible to RFI than by operating it in a photoconductive mode. The RF-frequency and RF-power dependences of the interference effect are illustrated. A method of predicting the combined effects of light illumination and RFI is suggested. Methods of avoiding this interference are discussed  相似文献   

18.
The reactive component of a PIN diode is known to be a function of current due to conductivity modulation in the I-region. This reactive component can negatively influence predicted attenuation levels in PIN diode attenuators if not properly accounted for. A figure of merit based on the PIN diode parameters, DC forward current, and operation frequency, is proposed that determines the operating conditions where this reactive component can be safely ignored. Simulations and measurement data on PIN diodes of various I-region widths verify the proposed figure of merit.  相似文献   

19.
文章对一种主要应用于光纤有线电视(CATV)中的集成光波分复用的单PIN探测器进行了分析和实验,该器件用于数据的上传、下载以及CATV信号的接收.实验指标可以满足:响应度在1 550 nm波段>0.9 A/W,插损<0.8 dB,1 550 nm隔离度>20 dB,回损>45 dB,双通道二阶互调非线性指标(CSO)>70 dB,工作温度为-40~85℃.  相似文献   

20.
大数据分析作为当下的热点概念,得到越来越多的重视。但大数据不是万能的,它有自身的局限性,过分依赖大数据会产生很多问题。针对这一观点,文章分析列举大数据自身存在的局限性,概括在进行大数据分析时需要注意的问题,提出在做大数据分析时,应当把大数据做小的处理方式。  相似文献   

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