共查询到20条相似文献,搜索用时 109 毫秒
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边界扫描测试技术很好地解决了VLSI电路诊断、测试的困难问题,得到了广泛的应用。作者在查阅大量文献资料的基础上.总结出了边界扫描技术在提高电路板可测试性上的两种优化问题:即设计过程中设计复杂性和测试性改善的优化,以及在测试生成算法中紧凑性与完备性优化的问题,论文详细分析了这两种问题,分析比较了相关的优化算法,并对这两种优化问题未来的发展方向进行了预测。 相似文献
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IP电话回声消除器中自适应滤波器的研究 总被引:2,自引:0,他引:2
介绍了一种用于IP电话的自适应回声消除器,采用LMS自适应滤波器实现。首先通过Matlab进行LMS算法的步长选择,并用生成的符合G.168要求的带限CSS测试信号对回声消除器的性能进行了测试。 相似文献
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具有自适应功能的算法是实现智能化信息安全系统的关键。免疫算法是模拟生物免疫系统功能的一种智能学习算法。论文介绍了一种全新的免疫学习算法。该算法特有的多层识别机制可以更加准确有效地识别外部入侵。针对该算法识别器生成周期长的缺陷,文章又提出了一种基于遗传算法的识别器生成方案。 相似文献
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文中介绍了一种用于IP电话的自适应回声消除器,采用NLMS算法自适应滤波器来实现.首先通过MATLAB进行了NLMS算法的步长选择,并用生成的符合G.168要求的带限CSS测试信号对回声消除器的性能进行了测试. 相似文献
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基于遗传算法的自适应测试生成 总被引:6,自引:1,他引:5
文章介绍了一种基于遗传算法的自适应测试生成方法,首先讨论了用遗传算法进行测试生成时构造评价函数的一些方法,然后应用组合电路的Hopfield神经网络模型,提出了基于遗传算法的自适应测试生成算法,该方法不同于传统的方法,它不需要故障传播传播、回退等过程,实验结果表明了本算法的可行性。 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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罗晓羽 《信息技术与标准化》2008,(6):37-39
论述了推进电子行业标准制修订项目计划管理信息化的必要性.并提出了具体措施;详细介绍了电子行业标准制修订项目计划管理数据库的设计思路和实现方法.阐述了对后续工作的几点思考. 相似文献
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对影响镍镀层内应力的因素做了介绍和分析,提出了对收缩应力的一种解释,提供了排除这些因素影响的方法,指出重视镀液的管理是减少各种影响内应力因素的主要办法。 相似文献
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The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献