排序方式: 共有55条查询结果,搜索用时 15 毫秒
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数字滤波器是语音与图像处理和模式识别等应用中的一种基本数字信号处理部件。本文提出了一种3G移动通信脉冲成形FIR滤波器的定向系统芯片实现结构:基于分布式运算(DA,即Distributed Arithmetic)结构的查表法。使用了Alter公司的FPGA芯片-EP1KSOQC208-3,阶数和位数以及滤波器特性均可方便改变。 相似文献
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Maria Mrtensson 《Critical Perspectives On Accounting》2009,20(7):835-846
Humans have, for centuries, measured and quantified their world and themselves in various ways. This ‘quantifying impulse’ reached an early peak in Europe in the era of political arithmetic, from the late seventeenth through the eighteenth centuries. The overall purpose of this paper is to examine contemporary attempts to measure intangible qualities and to compare them to similar attempts from the political arithmetic era. The discussion is structured using three themes; the idea of balance, the search for correlations and the conception of human nature. The findings of the paper indicates that the era of political arithmetic is not so distant at it might seems. 相似文献
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ABSTRACTThe widely cited Economic Freedom of the World index is an aggregate measure of economic freedom calculated by using a simple arithmetic mean of scores over five sub-dimensions: (1) size of government, (2) legal structure and security of property rights, (3) access to sound money, (4) freedom to trade internationally and (5) regulation of credit, labour and business. The use of a simple arithmetic mean implicitly assumes that the different sub-dimensions are ‘perfect substitutes’. To explore the implications of this assumption, we compute an aggregate economic freedom score and ordinal ranking of countries, by taking a geometric mean of the five sub-dimensions. For this alternative specification, the marginal impact of each sub-dimension on the aggregate score is no longer independent of the other sub-dimension scores. Consequently, countries with inconsistent levels of economic freedom across sub-dimensions are ‘punished’ to a greater degree than are countries with less variability across sub-dimensions. Our alternative specification results in considerable movement in terms of country rankings. The geometric mean measure does not appear to explain economic growth as well as the arithmetic mean measure. 相似文献
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探讨了目前以功率谱特征分析为主的声目标识别技术的基础理论、经典算法;并提出了相对传统的取样积分方法等其他声信号处理方法在声目标识别技术中的补充性应用的实现途径,以弥补单一的声目标识别算法的不足。 相似文献
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文章提出了在微机Windows环境中的一种联机电子手写签名认证算法。该算法在强调签名的形状和签名压力的动态特征上都具有相似性,并采用了基于特征函数的点—点手写签名匹配映射方法,先将联机输入的电子手写签名切分为笔段,以笔段作为签名的特征区,对两个待比较的签名相应笔段中的点,经由点—点的映射算法得到最后的匹配映射结果。 相似文献
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文章阐述了基于gini系数的决策树构造算法——CART算法。为了使算法能处理递增的数据,引入递增式学习方法,提出了一种改进算法。递增式学习的主要思想是测试函数的提升,它首先使用已有的数据用CART算法生成一棵决策树,然后使用递增的数据和递增式学习的方法来修改已有的决策树,最后从理论和实践两方面证明改进算法的正确性和有效性。 相似文献
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