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基于可变精度粗糙集的决策规则格构造 总被引:1,自引:1,他引:0
谷雨 《微电子学与计算机》2005,22(4):174-176,180
基于概念格理论提出了决策规则格的概念,格中的每一节点均可表示为相应的决策规则。针对格节点之间存在偏序关系的特点,文中给出了三种剪枝策略。特别地,将粗糙集知识约简的思想和可变精度粗糙集的β下近似思想应用于决策规则格的构造,有效地减少了格中节点的数目,并有较强的抗噪声数据干扰能力。 相似文献
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粗糙集和概念格是两种不同的知识发现和数据挖掘有效工具,已被广泛应用于许多领域。在对粗糙集和概念格基本理论研究基础上,提出了利用扩展粗糙集模型对概念格近似使其得以改进,即在概念格中引入β-多数蕴涵关系实现概念格中结点近似合并以及近似概念格(ACL)的构建,由此提出概念格粗糙近似和规则挖掘算法(LCRA)。最后通过UCI机器学习数据库相关测试表明该算法的可行性和有效性。 相似文献
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介绍和讨论了格理论在公钥密码体制中的应用.利用格的归约技术可以分析研究计算部分密钥位与整个密钥位的计算复杂性.在均匀模式下,计算基于公钥系统的Okamoto协议的2loglogp密钥位与计算整个密钥的难度是相同的.用格的理论建立了一个公钥密码系统,且该系统是安全的,除非能够在多项式时间内从n维格L中找到最短的非零向量. 相似文献
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针对机载多输入多输出(MIMO)雷达空时自适应处理(STAP)使用稀疏恢复技术时存在的格点失配问题,提出了一种基于三维原子范数的机载MIMO雷达STAP算法。该方法利用杂波空时谱在角度?多普勒域上固有的稀疏性,根据低秩矩阵恢复理论构造了基于三维连续原子集的MIMO雷达杂波信号稀疏恢复模型,避免了稀疏恢复中的格点失配问题,实现了杂波空时谱的高分辨率估计,有效提高了机载MIMO雷达STAP杂波抑制性能。仿真实验表明,本文方法在存在格点失配情况下的MIMO雷达STAP处理性能优于已有的基于字典网格的稀疏恢复方法和二维原子范数方法。 相似文献
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格基规约是格理论研究的一个重要内容,也是密码设计和分析中的一个重要工具。在理论研究中,许多格上问题都可以通过规约来求解(或者近似求解)。在密码学应用中,对一些密码方案的分析最终都可以等价成一个格基规约问题。文章提出了一种新型格基规约算法:SDR算法,新算法将正交格理论融入Schnorr算法中,在相同的规约效果下,可将原有Schnorr算法中多项式时间因子HKZ(2k)降为HKZ(k)。 相似文献
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本文利用了矩阵Ostrowski与bRAUER对角占优之条件得到了点格神经网络平衡点存在的充分必要条件,然后利用Ostrowski圆盘定理与Brauer卵形定理得到了点格神经网络的完全稳定性条件,这为非对称 模板的点格神经网络提出一和中新的研究方法。 相似文献
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对网格环境下基于本体的专家系统(Expert System)进行了研究,提出了构建在通用知识网格(Universal Knowledge Grid,UKG)和开放网格业务体系结构(Open Grid Services Architecture,OGSA)基础上的专家系统模型。为网格环境下创建大规模分布式基于本体知识库体系的专家系统提供了参考模型。 相似文献
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该文通过理论建模、Workbench有限元软件仿真和光纤布喇格光栅测量对存储惰性气体的某型号高压球形压力容器承压结构的应力分布进行了理论和实验分析研究,得出承压结构在工作条件下的应力分布规律,为其安全性能评估提供了理论和实验参考。在仿真实验的基础上将性能优越的光纤布喇格光栅引入该型号压力容器承压结构应力检测中,通过实验测量结果与仿真结果对比分析得出光纤布喇格光栅在应力检测方面的良好性能,为该类型球形压力容器的结构应力测量探寻出新的检测手段。 相似文献
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性能监控对网格系统的平稳运行、充分发挥网格系统的能效性起到了重要作用.文章针对校园网格,分析和总结其所具有的特点.介绍了基于校园网格的性能监控与分析系统的整体架构,以及该系统中网格资源性能数据采集、存贮、可视化监视、节点资源性能预报和网格规律性知识挖掘等模块的具体设计与实现. 相似文献
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在当前信息化社会中,知识管理的成功应用是组织在企业文化、企业核心竞争力、人才培养等关键性管理课题上取得成效的综合体现。系统化的知识管理是企业实现可持续发展的基本立足点。本文从知识管理的特点,难点、寻找知识管理最佳实践、KM平台工具选型、企业文化和部署知识库、知识库的外延一内容管理五个方面,分享了企业在知识库部署实践中积累的知识和经验。 相似文献
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行波管研制涉及真空技术、微波电子学、机械设计、材料科学等多学科知识,其产品具有小批量、多品种、实践性强等特点,用于卫星的器件对可靠性和寿命具有很高的要求。本文在分析行波管研制过程及其特点的基础上,提出一个行波管研制过程知识管理框架。该框架能有效组织、管理真空器件研制过程中的设计、装配、测试等环节所涉及的领域知识、过程知识、经验知识等;通过对真空器件研制过程知识的捕获、组织、利用管理,达到缩短周期、提高产业率、降低成本的目的。 相似文献
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The WSIS is centrally interested in knowledge and has defined for itself a mission that is broadly humanitarian. Its development ‘talk’ is, rightly, replete with notions of equity, preserving culture, justice, human rights and so on. In incorporating such issues into knowledge society and economy discussions, WSIS has adopted a different posture towards knowledge than is seen in dominant discourses. This study analyses the dominant knowledge discourse using a large corpus of knowledge-related policy documents, discourse theory and an interrelational understanding of knowledge. I show that it is important to understand this dominant knowledge discourse because of its capacity to limit thought and action in relation to its central topic, knowledge. The results of this study demonstrate that the dominant knowledge discourse is technocratic, frequently insensitive to the humane mission at the core of the WSIS, and is based on a partial understanding of what knowledge is and how knowledge systems work. Moreover, I show that knowledge is inherently political, that the dominant knowledge discourse is politically oriented towards the concerns of business and technology, but that an emancipatory politics of knowledge is possible. 相似文献
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Yu. V. Gulyaev P. E. Zil’berman E. M. Epshtein 《Journal of Communications Technology and Electronics》2007,52(2):198-205
The theory of exchange current switching in ferromagnetic nanojunctions is developed. Included in a junction are two contacting layers: a layer with fixed lattice magnetization and a free layer. The theory takes into account two concurrent effects induced by a polarized current in the junction: (1) transfer of transverse spins from the current carriers directly to the magnetic lattice and (2) injection of longitudinal spins into the free layer and the subsequent generation of a nonequilibrium sd-exchange field. A vector condition that requires continuity of the total spin flux of the electrons and the lattice is applied at the layer boundaries. The equation of motion that meets the vector boundary condition is derived for the magnetization values. The obtained solution exhibits specific features characteristic of inverse switching: Switching occurs when electrons are moving in an efficient injection field and, at the same time, involves transfer of torque to the lattice. 相似文献
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Development and Persuasion Understanding: Predicting Knowledge of Persuasion/Selling Intent From Children's Theory of Mind
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Matthew A. Lapierre 《The Journal of communication》2015,65(3):423-442
Determining the approximate age that children are able to understand the purpose of advertising messages has been a concern of children and media researchers for over 40 years. However, other theorists have suggested that age is not the necessary determinant of persuasion understanding but that cognitive development is (via theory of mind). In addition, Kunkel (2010) has suggested that advertising knowledge represents a number of competencies. Working with elementary school children, this study tested whether children's theory of mind (ToM) capabilities predicted advertising knowledge. Results indicate that children's understanding of selling intent is significantly linked to ToM development beyond the influence of age and linguistic competence and that children showed stronger knowledge of selling intent than knowledge of persuasive intent. 相似文献
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This paper presents ongoing research in standardised subfields of information technology (IT). This is an isolated segment of a comparative statistical analysis of trends in global (ISO) and local (SRPS) standardisation of knowledge sources (KS) in the subfields of IT applications (ICS2?=?35.240). The ultimate goal of the study is to define management of knowledge base systems. The specific objectives of this research are related to the presentation of original results, comparative criteria, and defining the level of innovativeness (based clustering) in forming a knowledge base (KB), from the knowledge source to modelling, implementing and improving the knowledge base system on the example of the subfields of IT applications. 相似文献
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为了获得较大的完全带隙,采用平面波展开法对2维光子晶体的带隙结构进行计算,通过栅格结构连接方形硅介质柱对正方晶格的带隙结构进行优化。在适当调整介质柱宽度和栅格宽度后,所构成的复式结构获得了较大的完全带隙。结果表明,在正方晶格结构的情况下,只有方形硅介质柱且其宽度为0.5a(a为晶格常数)时,仅存在TE模的带隙;只有同周期硅介质栅格结构且栅格宽度为0.22a时,仅存在TM模的带隙;复式结构的情况下,适当调整介质柱宽度w和栅格宽度d,在w=0.5a和d=0.05a时,可以获得较大的完全带隙,其宽度为0.0417ωe(ωe为中心频率);在w不变时,随着d的变化,在0.04a~0.11a出现完全带隙;在d不变时,随着w的变化,在0.42a~0.76a出现完全带隙;在4~36的范围内调整介电常数,在8.41~36之间能够出现不同宽度的完全带隙。这些结果对2维光子晶体的制作和应用是很有帮助的。 相似文献