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一种自适应的平面线轮廓度误差评定方法 总被引:21,自引:2,他引:19
提出一种基于最小二乘法,结合样条插值函数和优化技术的用于平面线轮廓度误差评定的数据处理方法,该方法的优点在于在轮廓度误差评定过程中能自动地实现被测轮廓与理论轮之间的适应性调整,以此分离并消除被测轮廓与其测量基准之间的位置误差对轮廓误差评定结果的影响。 相似文献
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利用神经网络的结构和算法构造一种新型的数字滤波器,具有非线性和自适应的滤波性能.通过同构滤波器逼近实验验证该滤波器的有效性. 相似文献
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分析了单一评估方法的局限性,基于兼容度准则提出一种将综合指数法和功效评分法等常用评估方法组合而成的一种综合评估方法,采用该方法对潜艇声纳的作战性能进行了评估分析,算例分析表明,该方法对于提高评估结果的可信性具有明显的作用. 相似文献
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视频点播(VOD),是一种可以按用户需要点播节目的交互式视频系统,广义来讲,它可以为用户提供各种交互式信息服务。根据一般酒店对VOD的实际需求,详细介绍一种基于局域网的酒店视频点播系统设计方案。 相似文献
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对“一种用于圆度误差评价的通用算法”一文的商榷刘文文(合肥工业大学精仪系,合肥230009)近读贵刊1996年第五期“一种用于圆度误差评价的通用算法”一文(以下简称“通用算法”),笔者针对该文的有关结论提出两点不同看法,以期与同行们共同探讨。首先,常... 相似文献
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随着数字技术的飞速发展,非线性节目编辑系统逐渐成为后期制作的主流,面对单机编辑的局限性,本文提出了一种以千兆以太网为基础的网络化解决方案,以便在节目后期制作与播出中实现节目素材与资源的共享. 相似文献
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提出一种采用传感器技术测量平板平面度的方法,检测过程简单,数据处理简化,该方法的应用将较大地提高劳动效率,降低劳动强度,是值得推广的一种新型平面度检测方法。 相似文献
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Jafar Mansouri Morteza Khademi 《International journal of imaging systems and technology》2009,19(4):306-315
Steganography is the art and science of data hiding. This article proposes an adaptive steganographic algorithm that embeds secret data in a compressed video stream using temporal and spatial features of the video signal and human visual system characteristics. Qualified‐DCT coefficients of I‐VOP and motion vectors of P‐VOP and B‐VOP are used for spatial and temporal features of the video, respectively. Embedded‐data are extracted without using the original video and there is no need for full decompression. Experimental results demonstrate that the proposed algorithm has high imperceptibility and capacity. Furthermore, the bit rate remains approximately constant. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 306–315, 2009 相似文献
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Yong Ha Kang 《国际生产研究杂志》2013,51(1):95-115
The development of a scheduling methodology for a parallel machine problem with rework processes is presented in this paper. The problem is to make a schedule for parallel machines with rework probabilities, due-dates, and sequence dependent setup times. Two heuristics are developed based on a dispatching algorithm and problem-space-based search method. In order to evaluate the efficacy of the proposed algorithms, six performance indicators are considered: total tardiness, maximum lateness, mean flow-time, mean lateness, the number of tardy jobs, and the number of reworks. This paper shows how these algorithms can adaptively capture the characteristics of manufacturing facilities for enhancing the performance under changing production environments. Extensive experimental results show that the proposed algorithms give very efficient performance in terms of computational time and each objective value. 相似文献
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A theory of a thermodiffusion column with transverse sampling streams is given on the basis of the transport equation for a binary mixture.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 31, No. 3, pp. 514–522, September, 1976. 相似文献
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In this paper, we investigate a single-machine scheduling problem with periodic maintenance, which is motivated by various industrial applications (e.g. tool changes). The pursued objective is to minimise the number of tardy jobs, because it is one of the important criteria for the manufacturers to avoid the loss of customers. The strong NP-hardness of the problem is shown. To improve the state-of-the-art exact algorithm, we devise a new branch-and-bound algorithm based on an efficient lower bounding procedure and several new dominance properties. Numerical experiments are conducted to demonstrate the efficiency of our exact algorithm. 相似文献
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The Resource-Constrained Project Scheduling Problem (RCPSP) is one of the most intractable combinatorial optimisation problems that combines a set of constraints and objectives met in a vast variety of applications and industries. Its solution raises major theoretical challenges due to its complexity, yet presenting numerous practical dimensions. Adaptive memory programming (AMP) is one of the most successful frameworks for solving hard combinatorial optimisation problems (e.g. vehicle routing and scheduling). Its success stems from the use of learning mechanisms that capture favourable solution elements found in high-quality solutions. This paper challenges the efficiency of AMP for solving the RCPSP, to our knowledge, for the first time in the literature. Computational experiments on well-known benchmark RCPSP instances show that the proposed AMP consistently produces high-quality solutions in reasonable computational times. 相似文献
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提出了一种自适应Chirplet信号分解过程中的参数优化估计方法,该方法首先利用最大投影分解原理结合分数阶傅立叶变换和拟牛顿方法进行参数估计,然后利用最大期望方法,进一步进行参数的优化。将提出的方法与传统的时频分析方法如短时傅立叶谱图,Wigner分布进行对比分析,仿真结果表明,提出的方法具有很高的参数估计精度、很高的时频图分辨率和抗噪能力。说明了本文提出的方法中引入EM算法的必要性。又将提出的方法应用到轴承的故障诊断中,实验结果表明,提出的自适应Chirplet分解方法是非常有效的。 相似文献
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研究了通过对终端视频帧质量的聚类分析来识别无线视频传输中码率变化的方法,以便为无线视频传输过程中视频码率自适应调整提供参考依据.针对经典模糊C均值(FCM)算法和K均值(K-means)算法需要设定聚类数目的问题,提出一种基于荻利克雷过程(DP)的FCM算法——DP-FCM算法.该算法将Dirichlet过程和FCM算法相结合,由视频帧信息权重峰值信噪比(IWPSNR)值使用DP过程混合模型模拟估计出聚类数目,然后进行FCM模糊聚类,通过设定合理的阈值,合并聚类结果相似项,完成视频帧的聚类,从而实现视频传输码率变化的识别.以LIVE视频库为试验数据源,对该算法进行了性能测试.试验结果表明,DP-FCM算法能够在无需设定聚类数目的前提下实现视频传输码率变化的分类识别. 相似文献
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耦合局部最优法作为一种新型的优化技术,既具有高效的搜索速度又具有全局搜索能力.然而,对于大规模优化问题,该方法容易陷入局部最优;另外,梯度信息在该项技术中起着重要作用,而对于复杂问题往往不能得到精确的梯度信息,从而使得该算法的全局搜索能力下降.本文分别从初始种群的确定、变步长搜索、自调节种群三方面对原算法进行了改进,提出了自适应耦合局部最优法,使之具备解决多变量复杂优化问题的能力.通过两个测试函数验证了改进算法比原有算法更易于得到全局最优解并保持较高的计算效率.最后,采用一个试验算例验证了自适应耦合局部最优法的有效性. 相似文献