A novel fusion paradigm for multi-channel image denoising

Multi-channel and single-channel image denoising are on two important development fronts. Integrating multi-channel and single-channel image denoisers for further improvement is a valuable research direction. A natural assumption is that using more useful information is helpful to the output results. In this paper, a novel multi-channel and single-channel fusion paradigm (MSF) is proposed. The proposed MSF works by fusing the estimates of a multi-channel image denoiser and a single-channel image denoiser. The performance of recent multi-channel image denoising methods involved in the proposed MSF can be further improved at low additional time-consuming cost. Specifically, the validity principle of the proposed MSF is that the fused single-channel image denoiser can produce auxiliary estimate for the involved multi-channel image denoiser in a designed underdetermined transform domain. Based on the underdetermined transformation, we create a corresponding orthogonal transformation for fusion and better restore the multi-channel images. The quantitative and visual comparison results demonstrate that the proposed MSF can be effectively applied to several state-of-the-art multi-channel image denoising methods.     

一种基于灰色系统理论的控制系统参数辨识算法的仿真研究

灰色预测补偿是一种对灰色系统进行白化的算法,该算法需要的信息少、计算量小。它可以克服常规PID控制存在超调的缺点。根据灰色PID控制算法,对系统不确定部分建立灰色模型,进行灰色预测补偿。通过仿真研究,该算法具有较强的鲁棒性,可以提高控制质量,减小控制系统的误差。     

恒定应力加速寿命试验算法探讨

恒定应力加速寿命试验具有试验方法简单、理论成熟、得到信息多、试验结果较为准确等优点。本文利用三种被广泛运用的统计推断方法对同一恒定应力加速寿命试验结果进行推断,分析比较算法的优劣：在样本量较小的情况下极大似然估计优于线性无偏估计,但是当各应力水平下的样品失效数较大时,极大似然估计与线性无偏估计几乎等效,而线性回归的方法计算较为简单,但是在应力水平较少的情况下误差较大。     

Integrated Risk of Progress-Based Costs and Schedule Delays in Construction Projects

This article aims to explore the impact of the integration of risk factors into delayed milestones for construction projects. A simulation model was developed to determine the impact of schedule variability on cost estimation. To generate random scenarios a Monte Carlo Simulation (MCS) technique was applied. The developed model computes the cost impact of delayed milestone in the expected budget. Using a risk integration approach revealed the critical time frame that may lead to a budget deficit for a project. As a result, a number of cost-sensitive risk factors and schedule delays were identified for the critical time period where the risk of budget deficit increases. The method of integration proposed in this article highlights the priority of risk factors and schedule delays for construction contracts involving Payments at Event Occurrences (PEO). Consequently, the developed method can be useful for practitioners in anticipation of potential increase of costs, hence, prevention of failure due to budget deficit.     

Distribution of Quasimidranges and Associated Mixtures

In this paper are presented and discussed tabulations of the cumulative distribution functions of quasimidranges and mixtures of quasimidranges of samples from a normal distribution. The tabulations extend up to samples of size 21. For quasimidranges not involving the extreme values of the sample, the departure from normality is very small. The physical problem giving rise to the mixtures is discussed.     

苏通大桥钢箱梁制造几何控制三维基准网布设研究

通过对苏通大桥主桥钢箱梁制造几何控制点采集控制网的布网研究,详细介绍了一个极小范围内的高精度施工控制网建立的要素,对比了精密工程测量的控制网和高精度大地控制网的区别,同时提出对控制网网形进行精度估算,以便确定控制网建立的可行性。     

曲面重构中测量点云精简方法的研究

反向工程研究中，根据三维测量数据进行曲面重构是其关键技术之一。介绍了曲面曲率的基本理论，根据曲率精简点云的方法及曲率估算的方法，并结合实际对根据曲率精简测量点云数据的方法进行了改进，着重研究了邻域搜索、曲率估算、曲率精简原则等，在保证测量精度的前提下，在提高曲面重构的计算效率、减少存储空间等方面取得了较好的效果。     

估测地下天然裂缝间距指数的新方法

Ｎａｒ和Ｌｅｒｃｈｅ（１９８４）提出的地下天然裂缝间距指数估测方法存在一定局限性，不能估测较大的裂每逢宰距指数；且由于它未考虑岩心中观察到的裂缝数对裂是距指数的影响。亦未考虑岩最度与裂缝数的关系，因而估测的准确度不高。针对该方法的缺陷，提出在岩心直径、钻孔与岩层、裂缝侧伏角为已知时，根据岩层厚度和各层在岩心中所含有裂缝数估测裂缝间距指数。新方法适用范围更广，即使只有单个钻孔资料，可以获得较准确的估     

基于MIM_LB算法的连续数字语音识别

互信息匹配模型依据互信息理论而提出，在语音识别中已经显示了良好的性能，文章在互信息匹配理论的现有成果的基础上，提出了基于互信息估计的连续语音识别算法MIM_LB算法，实验表明提出的算法简单有效．优于传统的LB算法。     

多传感器目标识别的数据融合

本文针对军事上的目标识别问题，论述了多传感器的属性融合技术，包括属性融合的概念，原理，处理结构，算法及应用举例，指出属性融合中存在的主要问题，难点及可能解决的途径，并预测了未来发展趋势。