A Layer-Stripping Method for 3D Near-Surface Velocity Model Building Using Seismic First-Arrival Times

In order to improve the efficiency of 3D near-surface velocity model building, we develop a layer-stripping method using seismic first-arrival times. The velocity model within a Common Mid-Point (CMP) ...     

基于小波变换的雷达目标回波信号提取算法

随着雷达技术的快速发展,低信噪比(signal-to-noise ratio, SNR)条件下的雷达目标信号提取越来越重要。传统的脉冲压缩算法在低SNR条件下作用不明显。提出了一种新的在低SNR条件下的雷达目标回波信号提取算法。该算法在传统脉冲压缩算法的基础之上,采用小波变换对脉冲压缩后的信号进行分解,提取信号高频信息的小波系数。再用改进的小波变换模极大值算法对信号的高频信息进行去噪,然后重构信号的高频信息,最后再重构完整的雷达目标回波信号。仿真结果表明,该算法能够有效地去除噪声,提取出雷达目标的回波信号,相比于脉冲压缩算法及其他算法性能得到了很大的提升。     

Fuzzy Views on Black-Litterman Portfolio Selection Model

In this paper, views of investor are described in fuzzy sets, and two fuzzy Black-Litterman models are constructed with fuzzy views and fuzzy random views respectively. In the models, expected returns and uncertainty matrix of views are redefined and the views are formulated by fuzzy approaches suitably. Then the models are tested with data from Chinese financial markets. Empirical results show that the fuzzy random views model performs the best, and both the fuzzy models are better than the traditional ones, demonstrating that the fuzzy approaches can contain more information in the views and measure the uncertainty more correctly.     

新生代农民工收入消费统计分析——基于郑州市817位新生代农民工调查数据

近年来,我国农民工群体正处在代际更替的阶段,新生代农民工有其独特的消费观念、消费结构和消费行为。同时,新生代农民工也面临生产生活方式和消费方式的变化,其收入提高与消费行为转变更是实现我国经济转型的重要推动力。基于此,本文选取郑州市作为样本地区,对新生代农民工的收入状况、消费观念和消费行为进行实地调查,运用Logist模型分析其收入状况、消费观念对其消费行为选择的影响。最后,从改善新生代农民工收入状况、人力资本提升和消费观念的引导等方面提出科学、合理的建议。     

Speeding Up the GVW Algorithm via a Substituting Method

Journal of Systems Science and Complexity - The GVW algorithm is an efficient signature-based algorithm for computing Gröbner bases. In this paper, the authors consider the implementation of...     

等候区手术患者家属的心理影响因素及干预措施

目的:探讨等候区手术患者家属的心理影响因素及其干预措施.方法:通过临床护理实践及查阅相关文献进行总结分析.结果:影响因素及其干预措施包括详解病情及手术风险性;对手术环境及术中情况的告知;完善急诊手术患者家属心理干预;根据不同文化水平进行健康宣教;尽量以病情为主,设计最经济有效的治疗方案;提高医护人员从业技能及道德品质.结论:对等候区手术患者家属进行积极有效的心理干预,可很大程度上减轻患者家属的焦虑程度,缓和医患关系,一定程度上提升了医疗质量.     

Simultaneous anti-windup synthesis for linear systems subject to actuator saturation

A synthesis method for global stability and performance of input constrained linear systems, which uses a linear outputfeedback controller and a static anti-windup compensator is investigated. Different from the traditional two-step anti-windup design procedure, the proposed method synthesizes all controller parameters simultaneously. Sufficient conditions for global stability and minimizing the induced L2 gain are formulated and solved as a linear matrix inequalities(LMIs) optimization problem, which also provides an opportunity to search for a better performance tradeoff between the linear controller and the anti-windup compensator.The well-posedness of the close-loop system is also guaranteed.Simulation results show the effectiveness of the proposed method.