共查询到20条相似文献,搜索用时 109 毫秒
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本文通过对汇编语言地指令系统的共性的研究.找到了一种有效的在汇编语言的基础上。自动得到源代码的流程图的算法。对软件维护自动化的实现提供了良好的开端。 相似文献
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本文叙述的“程序流程图的自动生成”是软件系统“程序的结构变挟与结构优化”的一部分。整个系统分成两篇文章来介绍,本篇先介绍对高级语言源程序进行自动分解并变换成流程图的过程。 相似文献
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基于图文法的动态软件体系结构支撑环境 总被引:6,自引:0,他引:6
使用类型化的属性图及其图文法来直观而形式地刻画软件体系结构和体系结构风格,用图转换来刻画动态体系结构的重配置行为.基于这种刻画,构建了一个动态软件体系结构支撑环境.该环境一方面,通过一个基于图文法的编辑器来支持体系结构图模型的可视化构造和操纵;另一方面,基于内置运行时体系结构技术实现了体系结构图模型在具体系统中的物理实施,并使得图模型上的图转换操作可以自动映射到实际系统的动态重配置上.再加上一系列的辅助设施,形成了一个较为完整的基于图文法的动态软件体系结构支撑环境. 相似文献
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针对复杂化工过程多尺度“三传一反”机理建模问题,提出基于实体语法系统的复杂化工过程调控流图模型,并以连续搅拌釜式反应器(CSTR)系统为例介绍了这类模型在具体问题中的应用。结果表明,调控流图作为一种图式化模型,能够将复杂化工过程多尺度的“三传一反”过程用同一形式表达,降低了建模难度,提高了模型的表达能力,有利于利用图论、定性仿真、微分方程等理论与方法对系统进行综合分析。调控流图继承了实体语法系统跨尺度建模和良好扩展性的特征,为宏观、微观等多尺度信息的融合提供了基础。 相似文献
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提出了一种基于符号执行的控制流图提取方法,该方法为原生库中的函数提供了符号执行环境,对JNI 函数调用进行模拟,用约束求解器对符号进行求解。实现了控制流图提取原型系统 CFGNative。实验结果表明,CFGNative可准确识别样例中所有的JNI函数调用和原生方法,并能够在可接受的时间内达到较高的代码覆盖率。 相似文献
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基于图模型的多边形自动并行构建算法 总被引:1,自引:1,他引:0
目前GIS基础算法并行化成为高性能GIS进一步深入的前提,作为GIS空间分析基础算法的重点,有必要对多边形构建提出一种自动并行算法。为此,提出基于图模型的多边形自动并行构建算法。该算法根据图模型中有向闭合环的特点对一组线段的集合进行多边形构建,能有效提高多边形构建的自动化程度。将搜索、排序等耗时较多的操作进行并行化处理,能有效减少全局搜索次数及整体排序和逻辑操作时间。实验表明,在对大规模线性数据生成区域时,该算法能有效地实现效率提升,达到良好的效果。 相似文献
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A novel, practical and convenient approach to constructing Calderbank-Shor-Steane (CSS) codes based on factor graphs is presented in this paper. Our proposed method is applied to solve two problems associated with constructing CCS codes. One is judging whether a code is a weakly self-dual code or not, the other is finding the generator matrix and parity-check matrix of a weakly self-dual code. The novelty, practicality and convenience of the approach are shown as follows. First, the approach is a hitherto unexplored one to constructing CSS codes. Second, the judgment of a weakly self-dual code is entirely based on factor graphs. Namely, we consider a code a weakly self-dual one when the Tanner graph or convolutional factor graph of its dual code can be obtained by that of its own via our proposed transform TR→L. Finally, we can obtain the generator matrix and parity-check matrix of a weakly self-dual code via factor graphs other than conventional algebra methods, which allow us avoid matrix computation to get them. An example is given to show how to construct quantum CSS code based on factor graphs. The method can be extended to other CSS codes. 相似文献
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Liang Lin Author Vitae Tianfu Wu Author Vitae Jake Porway Author Vitae Author Vitae 《Pattern recognition》2009,42(7):1297-1307
This paper illustrates a hierarchical generative model for representing and recognizing compositional object categories with large intra-category variance. In this model, objects are broken into their constituent parts and the variability of configurations and relationships between these parts are modeled by stochastic attribute graph grammars, which are embedded in an And-Or graph for each compositional object category. It combines the power of a stochastic context free grammar (SCFG) to express the variability of part configurations, and a Markov random field (MRF) to represent the pictorial spatial relationships between these parts. As a generative model, different object instances of a category can be realized as a traversal through the And-Or graph to arrive at a valid configuration (like a valid sentence in language, by analogy). The inference/recognition procedure is intimately tied to the structure of the model and follows a probabilistic formulation consisting of bottom-up detection steps for the parts, which in turn recursively activate the grammar rules for top-down verification and searches for missing parts. We present experiments comparing our results to state of art methods and demonstrate the potential of our proposed framework on compositional objects with cluttered backgrounds using training and testing data from the public Lotus Hill and Caltech datasets. 相似文献
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