Modified efficient importance sampling for partially non‐Gaussian state space models

The construction of an importance density for partially non‐Gaussian state space models is crucial when simulation methods are used for likelihood evaluation, signal extraction, and forecasting. The method of efficient importance sampling is successful in this respect, but we show that it can be implemented in a computationally more efficient manner using standard Kalman filter and smoothing methods. Efficient importance sampling is generally applicable for a wide range of models, but it is typically a custom‐built procedure. For the class of partially non‐Gaussian state space models, we present a general method for efficient importance sampling. Our novel method makes the efficient importance sampling methodology more accessible because it does not require the computation of a (possibly) complicated density kernel that needs to be tracked for each time period. The new method is illustrated for a stochastic volatility model with a Student's t distribution.     

基于横向型滤波器的多用户检测器

本文将横向型滤波器算法应用于CDMA系统之中，从而实现多用户检测的功能。分析和仿真结果表明，该类多用户检测器具有较好的抗“远近效应”能力和较为简单的结构，具有广泛的应用前景。     

基于邻域信息的噪声图像的恢复

噪声图像的恢复是影响图像信息提取的一个重要因素。主要针对现存的噪声图像恢复算法在消除细线及椒盐噪声方面的困难,基于待检像素的邻域信息提出了一种针对细线和椒盐噪声感染的图像的恢复算法。实验结果表明,文中所提算法不仅具有很好的抑制细线及椒盐噪声的效果,而且有效地保存了图像的细节与结构信息,同时对其它的噪声也有一定的抑制作用。     

将DSP技术引入“数字信号处理”实验教学的研究

针对数字信号处理课程实验,在现有基于MATLAB开展实验的基础上,提出了引入DSP技术的方案。以FIR数字滤波器为例,详细描述了该内容使用MATLAB现DSP开发软件进行实验的过程与主要结果。实践表明,在数字信号处理课程实验中增加DSP实现环节,能有效地提高学生的工程实践能力。     

内蒙古库里火沙兔矿区XZ01孔施工工艺探讨

文章通过收集XZ01号钻孔施工过程中的各类资料,重点分析该孔的技术难点、施工工艺、冲洗液运用等。以保证达到该孔的设计目的,并顺利终孔。     

有源电力滤波器（APF）的开发和实际应用

通过日常工作中的两个实际问题引入有源电力滤波装置（APF）,通过建立APF模型提出问题解决方案,通过APF的理论和消谐分析弄清了电力谐波的滤除过程,为电力设备的消谐和APF的应用推广指明了方向。     

我国产业结构调整对外部财富的影响机制研究

为研究我国产业结构调整对外部财富的作用影响及其影响机制,本文从贸易传导渠道及金融传导渠道出发,建立理论模型,分析并阐述了双渠道传导下,产业结构调整影响外部财富的作用机理,同时运用时变参数状态空间模型进一步验证。研究结果表明,我国产业结构调整通过贸易传导渠道对外部财富起正向积累作用,并从金融传导渠道对外部财富进行负向削减,两者存在抵消效应。且我国第二产业产值比及第三、二产业产值比的扩大对外部财富存在区别影响。当下正处于全球产业链重构关键时期,本文期望从调整外部财富角度助力于我国产业结构的优化。     

The tourism-led growth hypothesis: empirical evidence from Turkey

In the economic growth literature, the contribution of tourism to economic development has attracted great attention due to its significant roles as a source of foreign exchange earnings, creation of employment opportunities and an important source of public revenues in many countries. In this paper, we aim to analyse the empirical relationship between economic growth and tourism by employing different econometric techniques. First, we employed the Bound test approach developed by Pesaran, Shin, and Smith (2001, Bounds testing approaches to the analysis of level relationships. Journal of Applied Econometrics, 16(3), 289–326) in order to investigate the co-integration relationship between economic growth and tourism. Second, we used the Granger causality analysis for the 1998–2011 period and found evidence of a long-run uni-directional causality running from tourism to economic growth, but not vice versa. Our findings show that the Turkish case supports the tourism-led growth hypothesis (TLGH). Third, the autoregressive-distributed lag approach was employed in order to investigate the long-term and short-term static relationship between tourism and economic growth. The results show that tourism has a positive effect on gross domestic product and economic growth both in the long-term and short-term. Finally, the effect of tourism on economic growth was also investigated dynamically by employing the Kalman filter method. The findings of this method support the TLGH for Turkey.     

基于MATLAB辅助DSP设计自适应滤波器与实现

文章主要阐述了自适应滤波器的基本结构和原理,介绍了利用最小均方误差算法-LMS算法,完成了应用MATLAB辅助DSP对自适应滤波器的设计,并实现了对信号进行初步的降噪处理。     

基于ARM和旋转滤波的异步电机故障检测方法的研究

提出了一种基于ARM和Park矢量旋转滤波的异步电机故障检测方法。该方法结合Park矢量旋转滤波和异步电机定转子故障特征,对定子电流信号进行分析,可有效地检测异步电机的故障。并通过实验证明,该检测方法正确可行。