共查询到19条相似文献,搜索用时 203 毫秒
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基于信息融合的信号调制方式识别 总被引:1,自引:0,他引:1
本文利用信息融合技术,给出了多系统调制识别方法.单个系统利用高阶累积量构造识别特征.数据加权、特征平均、最小距离方法分别用于多系统数据层、特征层和决策层的融合.仿真结果显示多系统的调制正确识别率高于单系统的正确识别率,其中基于数据层融合的正确识别率高于基于特征层和基于决策层融合的正确识别率.说明信息融合有助于提高调制识别性能. 相似文献
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新型中医舌象分析仪关键技术研究 总被引:10,自引:0,他引:10
针对现有舌象采集装置在进行舌象信息采集时,不能满足卧姿病人的临床检测需要,且体积较大不方便携带,我们设计了新型舌象采集装置.该装置采用闪光灯作为仪器光源,构造了漫射照明条件,在较小的体积范围内产生高显色、均匀的照明环境.本文对新型采集装置进行了实验研究,并确定了各项采集参数.对于新型装置光学成像环境改变所引起的舌图像颜色数据变化,运用校准色板,采用离线彩色校正算法,实现了图像从新型舌象采集装置光学环境到标准环境的颜色转换,从而最终实现各舌象指标分析.实验结果证明了新型舌象分析仪的有效性. 相似文献
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双模制导是导弹武器系统实现精确打击的关键技术之一,对双模制导跟踪融合算法进行优化研究具有一定的理论价值和工程应用价值。根据红外/毫米波雷达双模制导跟踪融合算法的工程应用要求,从算法的实时性、鲁棒性、抗干扰性等要求出发,设计了跟踪融合算法优化方案:一是构造基于特征层的空情特征,并利用决策层提供的决策可信度因子,对跟踪融合算法进行了相应改进;二是根据模糊神经网络及双模传感器在飞行中的不同特征提供的决策信息,对跟踪融合算法进行了优化调用。进行了相应的仿真分析,证明了方案的可行性。 相似文献
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粗糙集(Rough Set,RS)理论是处理模糊和不精确问题的一种新型的数学工具,是主要应用于研究不完整数据、不确定知识的表达、学习及归纳的数学方法。他在医学领域的应用还处于萌芽状态。近年来,中医规范化和量化研究取得了明显的进展,在相当程度上说明了中医不但可以定性,而且可以定量。中医的术语规范化也为计算机在中医学中的应用提供了有利的条件。中医学是中国的传统医学,利用粗糙集理论和方法,建立一个可行的中医药方证相关性分析模型,该模型可以有效地处理中医药临床所积累的丰富经验知识,并得出中医药方证相关性的分析结论。 相似文献
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粗糙集在数据融合系统灰色评估中的应用 总被引:1,自引:1,他引:0
为了对数据融合系统性能进行综合评估,建立了相对完备的分布式融合系统性能指标体系.提出了一种基于粗糙集的数据融合系统灰色评估模型,通过引入粗糙集理论,对指标进行约筒并确定权值,减少了主观因素的影响,提高了评估的公平性.通过算例证明了模型的可行性和可靠性,为数据融合系统的开发、论证和实际使用提供了科学的理论决策依据. 相似文献
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粗糙集理论和支持向量机在数据挖掘方面具有较强的互补特性,基于粗糙集理论的上近似集、下近似集和边界域概念,结合支持向量机的分类原理,提出了一种支持向量机分类算法。首先,在支持向量机分类中定义样本分类的粗糙集规则,然后在边界域寻找两类样本中使判别式绝对值取值最小且分类正确的样本来确定最优分类面,脱离了对惩罚系数C的寻优问题,有效避免了过拟合问题,并通过循环迭代算法寻找合适的参数b,获得分类性能更优的支持向量机,最后通过对一个二维样本数据库进行分类实验,验证了此算法的有效性与可行性。 相似文献
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一种基于SVM/RS的中文机构名称自动识别方法 总被引:4,自引:0,他引:4
该文提出一种支持向量机(Support Vector Machines,SVM)和粗糙集(Rough Set, RS)相结合的中文机构名称短语识别方法。该方法借助词的基本语义搭配关系表示短语的构成规则,并通过粗糙集属性约简的方法自动学习到机构名称构成规则的无冗余集。识别时,首先寻找到与这些规则匹配的词串作为候选机构名,然后结合候选机构名以及其上下文词的语义特征,利用SVM分类器判断该候选是否是真正的机构名称。这种方法对1617万字人民日报语料开放测试的F值分别达到82.06%。 相似文献
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The bi-elliptical deformable contour and its application to automated tongue segmentation in Chinese medicine 总被引:6,自引:0,他引:6
Automated tongue image segmentation, in Chinese medicine, is difficult due to two special factors: 1) there are many pathological details on the surface of the tongue, which have a large influence on edge extraction; 2) the shapes of the tongue bodies captured from various persons (with different diseases) are quite different, so they are impossible to describe properly using a predefined deformable template. To address these problems, in this paper, we propose an original technique that is based on a combination of a bi-elliptical deformable template (BEDT) and an active contour model, namely the bi-elliptical deformable contour (BEDC). The BEDT captures gross shape features by using the steepest decent method on its energy function in the parameter space. The BEDC is derived from the BEDT by substituting template forces for classical internal forces, and can deform to fit local details. Our algorithm features fully automatic interpretation of tongue images and a consistent combination of global and local controls via the template force. We apply the BEDC to a large set of clinical tongue images and present experimental results. 相似文献
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An Incremental Rule Acquisition Algorithm Based on Rough Set 总被引:3,自引:0,他引:3
YU Hong~ YANG Da-chun~.Institute of Computer Science & Technology Chongqing University of Posts & Telecommunications Chongqing P.R.China .Chongqing R&D Institute of ZTE Corp. Chongqing P.R.China 《中国邮电高校学报(英文版)》2005,12(1)
1 Introduction Rough set theory introduced by Pawlak (1982)[1] is avalid mathematical theory developed in recent years, whichhas the ability to deal with imprecise, uncertain, and vagueinformation. It has been used successfully in such field asmedicine, pharmacology, market analysis, engineering,pattern recognition, data mining etc. Pawlak showed that theproblems of machine learning could be explained, analyzedand disposed within the framework of rough set theory[2]. Inhis paper[2], t… 相似文献
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S. Perrin E. Duflos P. Vanheeghe A. Bibaut 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2004,34(4):485-498
In the frame of humanitarian antipersonnel mines detection, a multisensor fusion method using the Dempster-Shafer evidence theory is presented. The multisensor system consists of two sensors-a ground penetrating radar (GPR) and a metal detector (MD). For each sensor, a new features extraction method is presented. The method for the GPR is mainly based on wavelets and contours extraction. First simulations on a limited set of data show that an improvement in detection and false alarms rejection, for the GPR as a standalone sensor, could be obtained. The MD features extraction method is mainly based on contours extraction. All of these features are then fused with the GPR ones in some specific cases in order to determine a new feature. From these results, belief functions, as defined in the evidence theory, are then determined and combined thanks to the orthogonal sum. First results in terms of detection and false alarm rates are presented for a limited set of real data and a comparison is made between the two cases: with or without multisensor fusion. 相似文献