共查询到20条相似文献,搜索用时 234 毫秒
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对软件成本估算方法进行合理评价,进而从当前众多软件成本估算方法中选择最合适的一种是十分重要的.在软件成本估算方法的评价体系的基础上,采用模糊评价与灰色理论相结合的综合评价方法对各估算方法进行评价,进一步通过实例证明该评价方法可以合理有效的评价软件成本估算方法,对软件开发项目实践有参考价值. 相似文献
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对现有的轮廓提取现状进行分析,把主要的轮廓提取方法划分为先验知识法、数学形态法、基于梯度的方法、水平集方法、活动轮廓模型方法、以及神经动力学方法六大类,并研究这些方法的主要特点。对轮廓提取方法研究进行展望,提出神经动力学方法是轮廓提取方法的发展方向。 相似文献
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王玮 《计算机与数字工程》2020,48(1):112-118
方法王玮(军事科学院研究生院北京100091)摘要文本自动摘要是一种利用计算机自动生成文本摘要的理论方法和技术。论文在对生成式自动摘要方法综述的基础上,提出了基于CNN和RNN混合神经网络的生成式自动摘要方法,对方法的思路进行了描述,并对原有方法和改进方法进行对比实验。实验结果表明,改进方法有更好的文本摘要生成效果。 相似文献
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一种基于目标域的车牌图像混合压缩方法 总被引:1,自引:0,他引:1
主要研究了对车牌图像进行压缩的方法.根据车牌的特点,先对其进行基于目标域方法的分块,随后采用小波变换和BP神经网络的混合方法对图像进行压缩.结果表明了该方法的高效性. 相似文献
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双语句对选择方法旨在从大规模通用领域双语语料库中,自动抽取与待翻译文本领域相关性较高的句对,以缓解特定领域翻译模型训练语料不足的问题。区别于原有基于语言模型的双语句对选择方法,该文从句对生成式建模的角度出发,提出一种基于翻译模型和语言模型相融合的双语句对选择方法。该方法能够有效评价双语句对的领域相关性及互译性。实验结果显示,利用该文所提方法选择双语句对训练所得翻译系统,相比于基准系统,在测试集上性能提升3.5个BLEU值;此外,针对不同句对质量评价特征之间的权重调节问题,该文提出一种基于句对重排序的特征权重自动优化方法。基于该方法的机器翻译系统性能继续提升0.68个BLEU值。
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功能点方法是一种比较准确的软件工程开发量度量方法。本文在对功能点方法进行分析的基础上,结合通信企业软件开发的实际,参照SPR对软件行业基础数据的研究,对功能点方法在分析通信企业软件开发预算中的应用进行了探讨,并以实例说明该方法在通信行业的适用性。 相似文献
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作战系统一体化的发展与完善涉及系统建模技术及建模角度、协作技术等诸多方面,研究一体化必须对这些方面进行分析.针对作战系统一体化问题进行了分析与研究,对一体化的基本需求以及一体化与传统方式的比较问题进行了分析,提炼了一体化建设及其建模在各个环节的优势,对作战系统一体化的可行性与优越性进行了分析.以网络化坦克作战系统为实例对其进行了说明,对一体化面临的主要问题进行了总体概括. 相似文献
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The hierarchies of knowledge and the mathematics of discovery 总被引:1,自引:1,他引:0
Clark Glymour 《Minds and Machines》1991,1(1):75-95
Rather than attempting to characterize a relation of confirmation between evidence and theory, epistemology might better consider which methods of forming conjectures from evidence, or of altering beliefs in the light of evidence, are most reliable for getting to the truth. A logical framework for such a study was constructed in the early 1960s by E. Mark Gold and Hilary Putnam. This essay describes some of the results that have been obtained in that framework and their significance for philosophy of science, artificial intelligence, and for normative epistemology when truth is relative.I am indebted to Kevin Kelly for several years of happy conversation from which the perspective and views of this paper grew, for comments on a draft of the paper, and for constructing some of the illustrations. A fellowship from the John Simon Guggenheim Memorial Foundation provided the liberty to write this paper. It was first presented in the Turing Colloquium, 1990. 相似文献
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Computer-aided analysis of autoradiographic films of DNA fragments is presented. The Powell least-squares procedure is used for optimization of parameters for components of complex densitometric curves. Since each densitometric spectrum may be divided for several non-overlapped blocks of bands, there is no upper limit on the number of parameters which must be optimized. Eight shapes for the component bands are utilized: symmetric and asymmetric Gauss and Cauchy functions, direct, symmetric and asymmetric product of Gauss function and inverse of Cauchy function, and log-normal function. The probability of DNA cleavage is calculated with correction for multiple cuts. The methods presented was applied to detailed analysis of densitometric spectra of a 21-bp DNA restriction fragment and allowed for direct correlation between structural microheterogeneity of DNA and the resulting cutting pattern. This method should facilitate the analysis of densitometric data from antibiotic-induced cleavage of DNA and footprinting experiments. 相似文献
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The problem of synthesis of optimal control for temperature of polysilicon rods is solved taking heat emission into account. A method of dynamic programming for linear systems with distributed parameters (SDP), a modified performance criterion, and a moderated form of solution to the functional Bellman equations for SDP are used. The obtained control algorithms for polysilicon were numerically realized earlier. 相似文献
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负载平衡是并行分组交换(PPS-parallelpacketswitch)结构的一项关键技术,该文对带缓存PPS结构中负载平衡的充要条件进行了研究。首先基于守恒原理建立流体并行交换的流量守恒方程,并分析流体并行交换中负载平衡的充要条件,在此基础上建立PPS的流量守恒方程,并定义PPS负载平衡,分析PPS负载平衡算法应该满足的充要条件。 相似文献
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Due to the importance to model-based control, dynamic parameter identification has attracted much attention. However, until now, there is still much work for the identification of dynamic parameters to be done. In this paper, an overview is given of the existing work on dynamic parameter identification of serial and parallel robots. The methods for estimating the dynamic parameters are summarized, and the advantages and disadvantages of each method are discussed. The model to be identified and the trajectory optimization are reviewed. Further, the methods for validating the estimated model are summarized and the application of dynamic parameter identification is mentioned. The results of this review are useful for manufacturers of robots in selecting proper identification method and also for researchers in determining further research areas. 相似文献