共查询到20条相似文献,搜索用时 62 毫秒
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通过运用非线性函数建立支持向量机的回归模型,使鲁棒性能运用于回归估计,并推出向量机优化的基本理论,给出一些新的优化问题,最后通过仿真实验进行验证,结果证实鲁棒支持向量机的非线性函数回归的可行性。 相似文献
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针对标准支持向量机在处理不平衡数据问题的缺陷,提出一种解决方法,首先采用一种改进上采样方法(Over-sampling)—SMOTE来平衡正负样本的数目,达到缓解两类样本数目悬殊的目的。然后引入差异惩罚思想对两类样本进行不同程度的惩罚。实验表明,本文提出的SDPC-SVM分类算法在处理不平衡数据的分类问题上具有可行性与有效性。 相似文献
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一种铝塑泡罩药品包装缺陷检测方法 总被引:1,自引:1,他引:1
目的针对铝塑泡罩药品人工检测时存在的包装缺陷,如效率低、成本高、稳定性差等,采用机器视觉技术对铝塑泡罩药品包装进行缺陷检测。方法采用快速鲁棒特征SURF提取算法、BOW算法和单分类支持向量机组成的缺陷检测算法框架,并完成铝塑泡罩药品包装缺陷检测系统的开发。通过搭建的实验平台获取280幅铝塑泡罩药品图像,并采用文中所提方法对180幅图像实施缺陷检测。结果实验结果显示,在阈值为1900、视觉单词数量为120、惩罚因子为0.9时,文中方法的准确率为99.4%。结论文中方法提高了铝塑泡罩药品包装缺陷检测的准确率和稳定性。 相似文献
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该文利用对回归支持向量机的不敏感函数进行改进,使回归估计具有一定的鲁棒性能,并推导出改进的支持向量机的基本理论,给出了对偶优化问题,并结合一个具体非线性函数估计的例子进行了仿真实验,结果验证了所提出的方法的正确性和有效性。 相似文献
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目的 解决目前纸病分类算法存在的实时性差、难以适应生产线在线检测要求等问题。方法 提出一种基于差影法和支持向量机的在线纸病检测分类方法。首先使用差影法来判断纸张是否含有纸病;对含有纸病的纸张进行打标机打标,同时存储图像,提取纸病区域外接矩形的特征向量;最后使用支持向量机对纸病进行分类。结果 将该方法与已有的BP神经网络以及朴素贝叶斯方法进行对比可知,分类正确率高于目前已有的分类方法,对于4种纸病的分类正确率均在90%以上,而且实时性好,更加适合于在线检测。结论 该方法可以有效地对纸病进行分类,满足生产线实时检测分类的要求。 相似文献
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A Combined Approach to the Pallet Loading Problem 总被引:4,自引:0,他引:4
Thom J. Hodgson 《IIE Transactions》1982,14(3):175-182
In this paper the two-dimensional pallet loading problem is considered: that is, the problem of loading a rectangular pallet of size L by W, drawing from a set of n rectangular boxes. The objective is to maximize the area covered on the pallet by the boxes loaded. The problem is approached using a combination of dynamic programming and heuristics. The structured solutions resulting from the application of the dynamic program have two serendipitous characteristics: any item may be placed on the periphery of the pallet for easy access, and some control may be retained over the center of gravity of the pallet. Computational results are given. 相似文献
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选择合适的维修方式是降低设备维修费用的重要手段.从分析设备的故障模式、影响及危害度入手,在建立设备维修方式影响因素层次结构模型的基础上,提出了一种基于模糊层次分析和目标规划的维修方式决策模型,并以核电厂发电机为例,阐明了维修方式的选择流程.实例研究显示,该方法可有效融合设备的定性和定量维修信息,为设备的维修管理提供较好的技术支持. 相似文献
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In a recent paper the first author developed a dynamic-programming-based heuristic for the two-dimensional pallet loading problem. This note presents improvements to that procedure which have resulted in reductions in CPU run times of up to 1/20, as well as drastic lowering of memory requirements. A fundamental improvement in the bounding function is developed, and another improvement taken from observations of real-world pallet loaders and furniture movers is presented. Other implications of the improvements are also discussed, and results are compared. 相似文献
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提出了一种新的基于统计与模糊隶属度的光学字符特征提取方法,可以快速准确地识别受噪声污染的光学字符.相比传统算法,本文方法的特征空间区分度更高,最小类间距离扩大33.2%以上.应用在径向基函数(Radical Basis Function,RBF)神经网络中,在字体字号变化且有背景噪声污染的影响下,识别率高达99%以上,且相比直方图投影法提速75%.理论分析与实验结果表明,与传统方法相比,该算法抗噪能力更强、模式区分度更高、时空复杂度更低,更简约、更全面地覆盖了字符的特征,应用范围广.已应用于实际系统,取得很好的实验结果. 相似文献
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为了实现飞机大部件的最佳位姿调整,基于层次分析-误差评定组合方法,研究了一种应用于综合评估数字化装配中关键测量特征点的误差控制权值的计算方法。采用引入权值的最小二乘法求解大部件位姿调整量,提高装配精度。通过层次分析(AHP)方法确定关键测量特征点主观权值,误差评定法确定关键测量特征点客观权值,两者结合综合评定关键测量特征点权值。以最小装配误差为优化目标,利用权值实现多个关键测量特征点的误差分配优化。实例分析中,将超差的对接交点误差由1.23 mm降低到了0.72 mm,满足各个测量点的容差要求。以奇异值分解算法求解目标优化初值,采用牛顿法迭代求解,得到部件的最优位姿,并以中后机身对接为对象分析验证权值分配的合理性。 相似文献
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Suraj Prakash Agarwal Mohammad Khalid Anwer Mohammad Aqil 《Drug development and industrial pharmacy》2013,39(5):506-511
The aim of the present work was to complex furosemide (FSM) with fulvic acid (FA) extracted from shilajit with the hope of having a better understanding of the complexation behavior. The effect of FA on the aqueous solubility, dissolution rate, and permeability of FSM was investigated. Different techniques, such as grinding, freeze drying, solvent evaporation, and so forth, were used for the preparation of the complex. The complexes were prepared in molar ratios of 1:1 and 1:2 FSM:FA and were evaluated for drug inclusion, solubility, differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, dissolution study, and permeation study. These methods confirm the formation of an amorphous inclusion complex of FSM with FA. 相似文献
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目的 基于高压密封微波消解技术,构建一种新型微波消解体系,并将其与电感耦合等离子体质谱(ICP-MS)联用,用于烟用内衬纸和框架纸中铬、镍、砷、硒、镉、汞和铅元素含量的测定.方法 在新的消解体系中,用氟化铵(NH4F)代替传统方法中的氢氟酸(HF),以降低对实验操作人员的危害,并考察不同实验条件对实验结果的影响.结果 最佳消解条件为0.2 g纸质样品在6 mL硝酸和0.5 mL NH4F体系中消解,微波消解程序为温度从室温升至185°C(20 min)保持30 min后降至55°C(20 min);7种元素的标准曲线线性良好(r2>0.9990),检出限低,加样回收率和重现性良好;在检测实际样品时,与传统方法相比,该方法的测定结果无显著性差异(P>0.05).结论 该方法快速准确、安全环保,适合于烟用内衬纸和框架纸中7种元素含量的测定. 相似文献
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A New Signal Processing and Feature Extraction Approach for Bearing Fault Diagnosis using AE Sensors
In this paper, a new signal processing and feature extraction approach for bearing fault diagnosis using acoustic emission (AE) sensors is presented. The presented approach uses time-frequency manifold analysis to extract time-frequency manifold features from AE signals. It reconstructs a manifold by embedding AE signals into a high-dimensional phase space. The tangent direction of the neighborhood for each point is then used to approximate its local geometry. The variation of the manifolds representing different condition states of the bearing can be revealed by performing multiway principal component analysis. AE signals acquired from a bearing test rig are used to validate the presented approach. The test results have shown that the presented approach can interpret different bearing conditions and is effective for bearing fault diagnosis. 相似文献
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Thorium distribution was studied in relation to concentration of Th, HCl, and metal chloride in aqueous solutions, the nature of the diluent, and the tributyl phosphate concentration in the extractant. Thorium extraction from salt solutions increases in the order NaCl < CaCl2 < AlCl3. The fact that introduction of up to 30% of benzene or dodecane into tributyl phosphate has virtually no effect on the Th extraction is important for industrial application. The results obtained are discussed. 相似文献