基于抽样定理导出的第一类部分响应形成滤波器特性

数字传榆系统中，应用第一类部分响应传输能获得奈奎斯特极限速率，且频带利用率达到理论极值。部分响应波形的形成滤波器在理论上呈余弦状，在物理上不能用模拟元件实现。文章利用抽样定理，首次由频谱的混叠导出物理上可实现的第一类部分响应形成滤波器特性。     

中国通胀预期测度及其对实际通胀的影响-基于贝叶斯Gibbs抽样算法的状态空间模型估计

通货膨胀预期是影响实际通胀的重要变量,也是货币政策有效运用的关键因素.在新凯恩斯混合菲利普斯曲线的理论框架下构建状态空间模型,利用贝叶斯Gibbs 抽样算法估计我国2001-2013 年的季度预期通胀率,进一步利用VAR 模型及脉冲响应函数分析我国通胀预期对实际通胀的动态影响,实证结果显示：我国季度预期通胀率的适应性特征强于理性特征;适应性预期冲击在短期对实际通胀会产生较大影响,但累积效应在大约9 个季度之后消失;理性预期冲击对实际通胀的正向影响会持续较长时间,并最终将实际通胀推高到一个新的水平.因此,货币政策应从降低适应性通胀惯性和管理理性通胀预期两个方面来调控通胀预期对实际通胀的影响.     

A study on sampling strategies in the figure cognitive process

This study was aimed at investigating the sampling strategies for 2 types of figures: 3-D cubes and human faces.The research was focused on: (a) from where the sampling process started; (b) in what order the figures' features were sampled. The study consisted of 2 experiments: (a) sampling strategies for 3-D cubes; (b) sampling strategies for human faces. The results showed that: (a), for 3-D cubes, the first sampling was mostly located at the outline parts, rarely at the center part; while for human faces, the first sampling was mostly located at the hair and outline parts, rarely at the mouth or cheek parts, in most cases, the first sampling-position had no significant effects on cognitive performance and that (b), the sampling order, both for 3-D cubes and for human faces, was determined by the degree of difference among the sampled-features.     

抽样调查在社会研究中应用的若干问题探讨

抽样调查是一种根据从总体中随机抽取样本的观察结果来估计和推算总体的调查方法，广泛运用抽样技术已成为各社会经济领域进行调查研究的趋势。在利用抽样调查开展社会研究的过程中，应科学合理地编制抽样框和选择抽样方式，采用多种手段尽可能获取真实信息。     

Part-time Employment and Performance at A-level

How many sixth-formers have part-time paid employment, and does this affect their performance at A-level? This article describes how one teaching institution set up a project to collect and analyse data in an attempt to find answers to these questions.     

高校贫困大学生心理健康状况探析

随着我国高校的扩招及收费制度改革等现实问题的出现,贫困大学生越来越多,他们的问题引起了社会及理论界的广泛关注。本文以辽宁科技学院为例,对全校贫困学生进行了问卷抽样调查,并采用焦点小组访谈的方法,了解贫困大学生的心理健康状况,并提出了有效解决其心理问题的方法。     

单位冲激函数δ(t)的广义定义及其特性分析

普通函数对单位冲激函数的定义是不严格的，本文用广义函数对其进行科学的定义，并在此基础上分析单位冲激函数的特性，单位冲激函数在信号分析和系统分析中有着极为重要的地位．     

Robust design and optimization for autonomous PV-wind hybrid power systems

This study presents a robust design method for autonomous photovoltaic （PV）-wind hybrid power systems to obtain an optimum system configuration insensitive to design variable variations. This issue has been formulated as a constraint multi-objective optimization problem, which is solved by a multi-objective genetic algorithm, NSGA-II. Monte Carlo Simulation （MCS） method, combined with Latin Hypercube Sampling （LHS）, is applied to evaluate the stochastic system performance. The potential of the proposed method has been demonstrated by a conceptual system design. A comparative study between the proposed robust method and the deterministic method presented in literature has been conducted, The results indicate that the proposed method can find a large mount of Pareto optimal system configurations with better compromising performance than the deterministic method. The trade-off information may be derived by a systematical comparison of these configurations, The proposed robust design method should be useful for hybrid power systems that require both optimality and robustness.     

行程编码方法的探讨

传统的行程编码是一种简单有效的数据压缩编码方法,属于无损压缩的范畴。在此基于对传统行程编码方法的研究,提出了适用于纹理图像压缩图像编码方法。采用这种方法可以取得与行程编码方法几乎相等的压缩效率,而且使纹理采样速度大为提高。