一种适用于信源数时变的自适应盲源分离算法

针对信源数动态变化情况下的盲源分离问题,首先采用一种基于交叉验证技术的估计方法用于估计时变的源数,然后推导了一种基于自然梯度和Frobenius范数相结合的自适应盲源分离算法,该算法不需要对源信号作任何约束性的假设,因此该算法适合于分离服从超高斯或亚高斯分布的信号。提出的算法通过了源数不变和源数动态变化2种方式实验的验证。     

铣挖法与综合机械化施工隧道定额编制

随着新的技术设备和施工方法在隧道工程中的应用推广,现行矿山法隧道定额编制方法已无法满足要求。该文探讨了采用铣挖法施工下隧道定额测算的方法,从工程量清单的构成出发,对隧道工程成本构成及影响因素进行了分析。以赵家湾隧道工程成本价估算工程为例,介绍了铣挖隧道工程成本估算的具体过程,并对估算结果进行了检验。     

单、三相负荷等效计算及节能分析

现行有关电气设计参考书和实际工程对单、三相负荷的等效计算,均按住建部颁发的电气设计规范中的规定执行,但规范中并未对单相负荷的属性作具体规定,这给实际设计工作带来了一定的影响。通过理论计算和分析,提出了单相相负荷及线负荷等效为三相负荷的两种计算方法,并达到节能的目的。     

基于作业的煤矿电耗定额制定研究

制定科学的电耗定额,是企业节约能源、降低成本的重要手段。以煤炭为唯一对象的定额制定方法,无法实施真正意义上的定额管理责任制。论文基于作业成本理论,划分煤矿各作业,确定作业电耗动因,选择定额制定的基本方法,制定了煤矿各作业的电耗定额。通过在神华宁煤集团枣泉煤矿的应用,证明该方法可为煤矿节约电能,带来经济效益。     

Suboptimal robust synthesis for MIMO plant under coprime factor perturbations

Suboptimal robust synthesis for MIMO nominal system under coprime factor perturbations is considered in classical and non-classical statements. In the classical statement, weights of perturbations and upper bound on magnitude bounded exogenous disturbance are assumed to be known to controller designer. Suboptimal synthesis within ε tolerance is reduced to the solution of log₂(1/ε) standard mixed sensitivity problems of ℓ₁ optimization. In the non-classical statement, the upper bounds on perturbations and exogenous disturbance are to be estimated from measurement data and suboptimal synthesis is reduced to the solution of 1/ε mixed sensitivity problems.     

Stochastic stability and robust stabilization of semi‐Markov jump linear systems

The semi‐Markov jump linear system (S‐MJLS) is more general than the Markov jump linear system (MJLS) in modeling some practical systems. Unlike the constant transition rates in the MJLS, the transition rates of the S‐MJLS are time varying. This paper focuses on the robust stochastic stability condition and the robust control design problem for the S‐MJLS with norm‐bounded uncertainties. The infinitesimal generator for the constructed Lyapunov function is first derived. Numerically solvable sufficient conditions for the stochastic stability of S‐MJLSs are then established in terms of linear matrix inequalities. To reduce the conservativeness of the stability conditions, we propose to incorporate the upper and lower bounds of the transition rate and meanwhile apply a new partition scheme. The robust state feedback controller is accordingly developed. Simulation studies and comparisons demonstrate the effectiveness and advantages of the proposed methods. Copyright © 2012 John Wiley & Sons, Ltd.     

基于洛伦兹范数的医学图像超分辨率重建研究

在超分辨率图像重建(SR)模型中,为了达到良好的重建效果,选择一个合适的代价函数是研究的重点。采用SR重建模型中的差错项选择了洛伦兹范数,正则化项选择了吉洪诺夫正则化,重建过程采用了迭代方法。提出的算法可以有效地解决医学图像SR重建过程中的去异值点和图像边缘保持的两大关键问题,达到良好的重建效果。为了验证上述算法的有效性,就一系列添加了运动模糊和不同噪声的低分辨率MRI医学图像进行了SR重建,并且与基于L2范数的重建算法的重建效果进行了比较分析。实验结果显示,所提算法具有良好的实用性和有效性。     

Artificial Agent Action in Markets

We summarise our experiences of a number of demonstrators and simulation experiments designed to test the feasibility of using artificial decision making agents in real-time domains, and comment on the significance of our results to autonomous artificial agent action patterns in markets. Our main hypothesis is that the use of norms can extend the capability of artificial decision makers beyond what is obtained from implementing individual utility maximizers in keeping with rational choice theory.     

基于四元极谐变换矩与显著特征的图像鲁棒哈希算法

为了增强哈希序列对各种几何变换攻击的鲁棒性,设计基于四元极谐变换矩与显著特征的图像鲁棒哈希算法.引入线性插值与自适应Wiener滤波器,实现初始图像的预处理;计算预处理图像的颜色向量角度,并基于Fourier变换,得到其对应的幅度信息,以获取两个不同的频谱;计算两个频谱的残差,确定图像中的局部显著性区域;通过LBP算子...     

基于Laguerre滤波器的核范数子空间辨识

连续时间随机系统是指各个变量是时间的连续函数并且状态和输出向量受到噪声干扰的动态系统.由于生物学、经济学以及物理学等领域都存在连续随机的现象,连续时间随机系统的辨识受到了各领域专家学者的广泛关注.本文针对连续时间随机系统提出一种基于Laguerre滤波器的核范数子空间辨识方法.首先,采用Laguerre滤波器获得系统的输入输出矩阵方程.然后,通过核范数最小化方法代替主奇异值的截断获得低秩矩阵逼近,并利用交替方向乘子法求解此优化问题.最后,采用最小二乘法和残差分析法分别得到模型的系统矩阵和噪声强度.仿真结果验证了所提方法的有效性、精确性及比较优势.