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基于加权双质心支持向量聚类的机群编队分组
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作者 齐玲辉 张安 曹璐 《系统工程与电子技术》 EI CSCD 北大核心 2014年第11期2213-2218,共6页
针对机群编队分组问题,提出了一种加权双质心支持向量聚类算法。所提算法在支持向量训练时引入最大熵原理,快速求解Lagrange乘子;针对样本特征对聚类结果的贡献不同,在聚类标识过程中,引入加权密度质心,提出了加权双质心聚类标识,并在... 针对机群编队分组问题,提出了一种加权双质心支持向量聚类算法。所提算法在支持向量训练时引入最大熵原理,快速求解Lagrange乘子;针对样本特征对聚类结果的贡献不同,在聚类标识过程中,引入加权密度质心,提出了加权双质心聚类标识,并在典型数据集上验证了所提算法的有效性。通过对机群编队分组模型的描述,建立了机群聚类时一个目标点需要的特征集,完成了编队分组的仿真实验。仿真结果表明了所提算法能够针对应用的具体样本集实行快速聚类分析,并保证聚类结果的有效性。 展开更多
关键词 支持向量聚类 最大熵 加权双质心 机群编队分组
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面向动态演化的话题检测研究 被引量:17
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作者 赵华 赵铁军 +1 位作者 于浩 张姝 《高技术通讯》 CAS CSCD 北大核心 2006年第12期1230-1235,共6页
受CURE聚类算法的启发,在分析了动态演化特性的基础上,提出了一种面向动态演化特性的双质心话题模型,以解决话题动态演化特性对话题检测的影响。该模型动态地建立分界点,以其为界将话题表示成初始质心和当前质心两个质心。初始质心... 受CURE聚类算法的启发,在分析了动态演化特性的基础上,提出了一种面向动态演化特性的双质心话题模型,以解决话题动态演化特性对话题检测的影响。该模型动态地建立分界点,以其为界将话题表示成初始质心和当前质心两个质心。初始质心代表分界点之前话题所关注的内容,当前质心表示从分界点到当前时间之间话题所关注的内容。提出了基于时间和词分布密度两种不同的分界点确定方法。详细描述了分界点、初始质心、当前质心的建立及更新方法。最后对基于双质心话题模型的英语话题检测算法进行了研究探讨,通过实验证明了该算法的有效性。 展开更多
关键词 话题检测 动态演化 双质心 分界点 分布密度
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改进虚拟力的有向传感器网络覆盖优化算法 被引量:6
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作者 蒋一波 梅佳东 +1 位作者 汪念华 盛尚浩 《小型微型计算机系统》 CSCD 北大核心 2018年第3期457-462,共6页
针对基于虚拟势场的有向传感器网络覆盖优化问题,以及对简单虚拟斥力造成不理想覆盖情况的考虑,提出了一种改进虚拟力的有向传感器区域覆盖优化算法MVPFCEA.该算法采用只分解虚拟力的方向,不分解其大小,并根据节点与各邻居节点所成双节... 针对基于虚拟势场的有向传感器网络覆盖优化问题,以及对简单虚拟斥力造成不理想覆盖情况的考虑,提出了一种改进虚拟力的有向传感器区域覆盖优化算法MVPFCEA.该算法采用只分解虚拟力的方向,不分解其大小,并根据节点与各邻居节点所成双节点覆盖图形引入质心计算,再以此来加入虚拟斥力修正指标,使节点扇形面受改进虚拟力而更准确的改变感知方向,以此来消除区域中的盲区和重叠区,此外同样在边界增加虚拟节点,提升边界区域的覆盖率;节点亦采用自调整角速度机制,提高算法执行效率,优化覆盖效果,仿真实验结果表明该算法对网络覆盖率的提升显著,且收敛速度快. 展开更多
关键词 有向传感器网络 改进虚拟力 节点质心 斥力修正 覆盖优化
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Subpixel Target Location Techniques for 3-D Coordinate Measuring System
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作者 YUZhi-jing MASu-ying 《Semiconductor Photonics and Technology》 CAS 2002年第2期111-115,共5页
the close photogrammetric 3-D coordinate measurement is a newmeasuring technology in the fields of the coordinate measurementmachine (CMM) in recent years. In this method, we usually place sometargets on the measured ... the close photogrammetric 3-D coordinate measurement is a newmeasuring technology in the fields of the coordinate measurementmachine (CMM) in recent years. In this method, we usually place sometargets on the measured object and take image of targets to determinethe object coordinate. The subpixel location of target image plays animportant role in high accuracy 3-D coordinate measuring procedure.In this paper, some subpixel location methods are reviewed and somefactors which affect location precision are analyzed. 展开更多
关键词 Subpixel precision target location centroid algorithm bilinearinterpolation
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Effect of Milk Proteins on Physical and Chemical Characteristics of Crispy Puff Snacks
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作者 Ismail Hussein Abd EI-Ghany Mohamed Abdelghany EI-Asser +1 位作者 Khalid Said Nagy Ahmed Ali Abd EI-Maksoud 《Journal of Agricultural Science and Technology(A)》 2013年第8期633-645,共13页
Dairy proteins included sweet whey solids (SWS), whey protein concentrate (WPC), milk protein concentrate (MPC) or sodium caseinate (SC) at level of 10% by weight were extruded with corn, rice, oat flour and o... Dairy proteins included sweet whey solids (SWS), whey protein concentrate (WPC), milk protein concentrate (MPC) or sodium caseinate (SC) at level of 10% by weight were extruded with corn, rice, oat flour and other ingredients in a twin screw extruder. The functional properties and textural of crispy balls snacks (CBS) have been studied. The results showed that different protein types were significantly affected on functional and chemical properties of extrudate. The bulk density of CBS-SC was the lowest due to the highest expansion, while CBS-WPC retained the most water in the product, whereas, the maximum value of water solubility index was obtained in the CBS-CWP. Results also showed that protein digestibility value of extrudates had higher than non-extruded products. Color analysis of CBS-SC and CBS-SWS products had the highest AE values (P ≤ 0.05), whereas CBS-SWS was statistically higher than CBS-SC in rank. Also, it was noticed that CBS-SWS had the highest value of browning index. The hardness of all extrudates products was desirable for expanded crispy where ranged from 17.3 N to 12.18 N. Generally, MPC and SC incorporated with cereal flour had acceptable quality characteristics and improved significantly the functional and texture properties of crispy balls products. 展开更多
关键词 EXTRUSION sodium caseinate whey protein concentrate functional properties crispy product.
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