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排序方式: 共有70条查询结果,搜索用时 31 毫秒
1.
自聚焦棒耦合性能的分析 总被引:1,自引:0,他引:1
本文采用光线光学的原理分析了自聚焦棒(GRIN)的光学性能,在折射率分布为抛物线近似的条件下,推导出较为简单的GRIN中的光线轨迹方程,并实验测量了GRIN的耦合效率,从而由理论和实验两方面讨论GRIN的聚焦特性。 相似文献
2.
Ray P. S. Han Kai-Yuan Yeh Guoli Liu Diankui Liu 《International Journal of Engineering Science》1992,30(12):1773-1787
The scattering and diffraction of plane SH-waves, by an arbitrary-shaped cylindrical canyon in anisotropic media is formulated here. Analytical solutions are obtained via the complex function theory, using the orthogonal property of the Hermite functions to solve the resulting set of infinite algebraic equations. Expressions for scattered displacements and scattered stresses are given. Three cross-sectional profile types are used in the numerical simulation of the two-dimensional canyon topography: (a) a semi-circular profile, (b) a semi-elliptical profile and (c) a triangular profile. The results obtained in (a) and (b) are consistent with known solutions computed by Trifunac and his co-workers [1,3] using a different method. As the exact solution for (c) is not known to exist, the result given here is believed to be new and would therefore serve as a useful check for numerical analysts working in this area. 相似文献
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Software testing is essential for software reliability improvement and assurance, and the processes of software testing are intrinsically dynamic. However they are seldom investigated in a mathematically rigorous manner. In this paper a theoretical study is presented to examine the dynamic behavior of software testing. More specifically, a set of simplifying assumptions is adopted to formulate and quantify the software testing processes. The mathematical formulae for the expected number of observed software failures are rigorously derived, the bounds and trends of the expected number of observed software failures are analyzed, and the variance of the number of observed software failures is examined. On the other hand, it is demonstrated that under the simplifying assumptions, the software testing processes can be treated as a linear dynamic system. This suggests that the software testing processes could be classified as linear or non-linear, and there be intrinsic link between software testing and system dynamics. 相似文献
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6.
Zheng Zheng Wei Liu Kai-Yuan Cai 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2010,14(12):1339-1348
In many applications, such as intelligent decision systems, there are usually random perturbations caused by the constant changing of real situations, thus the analysis of the robustness with respect to random perturbations is practically important. In the side of fuzzy methods, a corresponding problem arises: will a small random perturbation of fuzzy input cause a big variance of fuzzy output? This paper study the robustness of fuzzy schemes in environments with random perturbations. It focuses on fuzzy algebraic operators, and proposes two methods to analyze their robustness in environments with random perturbations. The effectiveness and features of the methods are shown by simulations. 相似文献
7.
Software execution processes as an evolving complex network 总被引:2,自引:0,他引:2
Inspired by the surprising discovery of several recurring structures in various complex networks, in recent years a number of related works treated software systems as a complex network and found that software systems might expose the small-world effects and follow scale-free degree distributions. Different from the research perspectives adopted in these works, the work presented in this paper treats software execution processes as an evolving complex network for the first time. The concept of software mirror graph is introduced as a new model of complex networks to incorporate the dynamic information of software behavior. The experimentation paradigm with statistical repeatability was applied to three distinct subject programs to conduct several software experiments. The corresponding experimental results are analyzed by treating the software execution processes as an evolving directed topological graph as well as an evolving software mirror graph. This results in several new findings. While the software execution processes may demonstrate as a small-world complex network in the topological sense, they no longer expose the small-world effects in the temporal sense. Further, the degree distributions of the software execution processes may follow a power law. However, they may also follow an exponential function or a piecewise power law. 相似文献
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随着网络带宽的快速增长,正则表达式匹配逐渐成为网络数据处理系统的性能瓶颈。为了获得更高的匹配效率,基于FPGA的正则表达式匹配引擎成为近年来的研究热点之一,而将正则表达式高效的转换成硬件描述语言是其中的关键技术。首先分析了正则表达式转换为硬件电路的算法,然后在此算法基础上实现了一个编译器。最后在Modelsim平台上进行了仿真,仿真结果证明了编译器的正确性。 相似文献
10.
Kai-Yuan Cheng 《Minds and Machines》2009,19(3):407-419
Kripke (Wittgenstein on rules and private language: an elementary exposition. Harvard University Press, Cambridge Mass, 1982) rejected a naturalistic dispositional account of meaning (hereafter semantic dispositionalism) in a skeptical argument about
rule-following he attributes to Wittgenstein (Philosophical investigation. Basil Blackwell, Oxford, 1958). Most philosophers who oppose Kripke’s criticisms of semantic dispositionalism take the stance that the argument proves
too much: semantic dispositionalism is similar to much of our respected science in some important aspects, and hence to discard
the former would mean to give up the latter, which is obviously wrong. In this paper, I shall discuss and reject a recent
defense of Kripke by Kusch (Analysis 65(2):156–163 2005; Sceptical guide to meaning and rules: defending Kripke’s Wittgenstein. McGill-Queen’s, London, 2006). Kusch attempts to show that semantic dispositionalism differs from the sciences, and consequently, Kripke’s attack can
only target semantic dispositionalism, but not the sciences. Specifically, Kusch identifies some important features of the
sciences with regard to how it employs idealization and ceteris paribus clauses, and argues that the ways in which semantic dispositionalism uses them are dramatically different. I argue that,
upon close examination, the two are more similar than otherwise in each of those features. 相似文献