A simple form synthesis of linear time-variant digital filter via spectral decomposition of its impulse response

The paper describes a new technique to synthesize a finite impulse response of linear time-variant (LTV) digital filter. First, a finite impulse response is decomposed into a sum of products of two orthogonal sequences. The direct implementation of the decomposed impulse response leads to the parallel connection of linear time-invariant (LTI) digital filters, followed by time-varying multipliers. A simple filter structure is obtained by properly modifying the sequences to realize the parallel form structure as a cascade connection of first- or second-order recursive LTI filters. The structure is easy to implement on a computer and saves computation time. Numerical examples illustrating the technique are included.     

A class of fast fixed-time synchronization control for the delayed neural network

This paper deals with the synchronization control of a class of delayed neural networks using a fast fixed-time control theory. By employing Lyapunov stability theory, a novel sufficient criterion is derived such that two neural networks can be synchronized within a fixed-time. Compared with some existing results, the proposed controller can render two neural networks faster synchronized. A numerical example is given to demonstrate the effectiveness of the criterion.     

中国碳排放增长的多层递进动因——基于SDA和SPD的实证研究

研究碳排放增长的多维、多层动因,识别关键的增排产业链和增排路径,对于宏观减排政策制定和微观减排路径选择都具有较强的现实意义。本文基于非竞争型投入产出模型,利用结构分解和结构路径分解的分析方法,从总体、生产阶段、产业链3个层次对中国碳排放增长进行了递阶分解分析,识别出了2010—2015年中国碳排放增长的主要动因和路径。研究结论表明：①需求规模变化是中国总体、生产阶段、产业链碳排放增加的主导影响因素;②煤炭消费发挥着减排作用且贡献巨大,但其他能源的增排效应使煤炭的减排贡献大打折扣;③能源效率变化对各生产阶段的影响为正且呈递减趋势,最终需求结构变化对第一生产阶段的碳排放具有显著减排效应,对其他生产阶段具有轻微增排效应;④需求规模变化和直接消耗系数变化是多数增排产业链的最大影响因素,30条增排路径占中国2010—2015年碳排放增加量的25.7%,构成了碳排放增加的关键路径和动因。最后,从宏观和微观两方面提出了相应的减排政策建议。     

Automatic term class construction using relevance—A summary of work in automatic pseudoclassification

Term classifications and thesauri can be used for many purposes in automatic information retrieval. Normally a thesaurus is generated manually by subject experts: alternatively, the associations between the terms can be obtained automatically by using the occurrence characteristics of the terms across the documents of a collection. A third possibility consists in taking into account user relevance assessments of certain documents with respect to certain queries in order to build term classes designed to retrieve the relevant documents and simultaneously to reject the nonrelevant documents. This last strategy, known as pseudoclassification, produces a user-dependent term classification.A number of pseudoclassification studies are summarized in the present report, and conclusions are reached concerning the effectiveness and feasibility of constructing term classifications based on human relevance assessments.     

A novel LMI-based optimization algorithm for the guaranteed estimation of the domain of attraction using rational Lyapunov functions

In this article we deal with the classical problem of estimating the domain of attraction (DOA) of autonomous dynamical systems. We propose a new LMI estimation method based on recent results from the mathematical theory of moments. In contrast to previous works we exploit the advantages of rational Lyapunov functions to enhance the estimates. Several examples illustrate the estimation method.     

浅析web 2.0的应用与发展趋势

web2．0（第二代互联网）的出现改变了信息传播理念,本文从web2．0核心社会软件着手来分析,从理论应用技术,及其发展趋势进行了探讨。     

Endogenous technical advance and the stochastic trend in output: A neoclassical approach

In the recent endogenous growth literature, the trend in output is stochastic, while investment in scientific knowledge is treated as analogous to a capital stock. This paper models both research and development (R&D) and disembodied technical advance using neo-classical equations, which specify the equilibrium stocks as a function of prices and output. The elasticity of R&D in the production function, estimated using factor shares, is time-varying and increasing. Returns to scale are increasing in all factors. The most important aspect of the model is that the equilibrium rate of technical advance is not cyclically invariant, but co-moves with output at business cycle frequencies. This allows the production function to behave as a stochastic trend. Growth accounting demonstrates that long-term variations in the rate of productivity growth have been associated mainly with low-frequency fluctuations in the rate of disembodied technical advance, with secondary effects from the stocks of R&D and physical capital. During the high productivity period 1948–1972, technical advance contributed 1.48 percentage points per year to output, with 0.98 accounted for by R&D. The productivity slowdown of the mid-1970s was accounted by a gradual decline in the effect of R&D, and a more abrupt collapse in disembodied technology. The subsequent productivity revival was associated with two accelerations in disembodied technical advance, the first beginning in the early 1980s, and the second in the mid-1990s. The production function is simulated in a small econometric model. Model simulations find that exogenous shocks to the inflation rate generate significant variations in growth by inducing fluctuations in disembodied technology.     

A fast procedure for the calculation of similarity coefficients in automatic classification

A fast algorithm is described for comparing the lists of terms representing documents in automatic classification experiments. The speed of the procedure arises from the fact that all of the non-zero-valued coefficients for a given document are identified together, using an inverted file to the terms in the document collection. The complexity and running time of the algorithm are compared with previously described procedures.     

浅析目录学与创新教育的关系

本文从认识方式的角度分析创新活动与书目运用的过程中存在的紧密联系，即为发散思维与集中思维的有机结合，建设开设目录学课程作为创新教育的组成部分。     

农村可持续发展态势测度与评价

尝试依据生计资源的拥有量将农村的可持续发展态势划分为三个等级,即"趋贫状态"、"维持状态"、"趋富状态"。借助1992年至2011年的数据为基础,研判我国农村发展处于中等可持续的阶段,生计资源属于"维持状态"。农村可持续发展态势测度与评价,是对农村发展的可持续性度量体系的丰富与完善,也是探索生计可持续发展能力的有益尝试。     

Calculating the information content of an information process for a domain expert using Shannon''s mathematical theory of communication: A preliminary analysis

The problem addressed in this article is to use Bertram Brookes' ‘fundamental equation’ as a starting off-point for a conceptual exercise whose purpose is to set out a method for calculating the information content of an information process. The knowledge structure variables in the Brookes' equation are first operationalized, following principles set out in Claude Shannon's mathematical theory of communication. The set of ‘a priori’ alternatives and the a priori probabilities assigned to each member of the set by the person undergoing the information process is the operational definition of the variable ‘K[S]’ from the ‘fundamental equation,’ which represent the person's knowledge structure ‘before’ the information process takes place. The set of ‘a posteriori’ alternatives and the revised probabilities assigned to each member of the set by the person undergoing the information process is the operational definition of the Brookes' variable ‘K[S + ΔS],’ which is the person's knowledge structure ‘after’ the information process takes place. To illustrate how the variables can be determined, an example of a information process is used from a recent real-life archeological discovery.     

Design of 2-D stable analog and recursive digital filters using properties of the derivative of even or odd Parts of Hurwitz polynomials

In this paper, a method for the design of 2-D analog and recursive digital filters is presented. Starting from a structure in the analog domain, suitable even or odd parts of two-variable Hurwitz polynomials are generated. This enables 2-variable very strictly Hurwitz polynomials (VSHP) to be obtained,² thus avoiding non-essential singularities of the second kind. Thus it will ensure a stable 2-D recursive digital filter obtained by the use of bilinear transformations. Examples are given to illustrate the method.     

论我国投资乘数效应变动的趋势及原因

通过对近10年来我国投资乘数效应的变动趋势的分析,指出我国投资乘数的变化趋势是投资乘数较小并不断降低,且变化频繁。究其产生的深层原因主要是我国消费倾向低、资金沉淀以及投资消费周转壁垒过多等因素。通过对其原因的剖析,以期为我国经济政策的制订提供一定的理论依据。     

科技创新中心演进趋势、建设路径及绩效评价研究综述

从科技创新中心的内涵、演进趋势、建设路径模式选择和评价方法四个方面进行文献研究,分析科技创新中心的相关理论、评价方法及存在的缺陷,为准确把握全球科技创新中心的基本特征及发展规律提供理论依据,对我国部分重点城市或区域正在开展的科技创新中心建设具有一定的借鉴意义。     

A simple approach to mathematical modelling of integer order and fractional order fuzzy PID controllers using one-dimensional input space and their experimental realization

Though over the years, mathematical modelling of fuzzy PID controllers is carried out extensively with two-dimensional and three-dimensional input spaces, the modelling is rarely attempted using one-dimensional input space. In this paper, this gap is reduced by proposing a simple approach where each of the fuzzy P, fuzzy I, and fuzzy D components is modelled using one-dimensional input space and merged to provide the complete PID action. Another speciality of the proposed approach is that it does not require any AND or OR operator for obtaining the mathematical models of individual PID components. To the best of author’s knowledge, such a modelling approach is completely new. This newly introduced idea of modelling is further extended to fractional order fuzzy PID controllers. Applicability of the proposed fuzzy controllers is delineated with four simulation examples and one real-time experimentation case study. To understand the usefulness of the proposed control schemes, performances of the newly obtained controllers are compared with the results available in literature. As the proposed controllers are model-free controllers, they can easily be implemented for other control applications also.     

国际软件专利计量分析及中国对策

运用大型文献处理软件Bibexeel和信息可视化Pajek等绘图软件,对国际软件专利申请的国家分布、高产机构分布、高产发明者及其合作网络等进行了计量分析并绘制了知识图谱.结合定量分析结果,提出中国软件产业发展对策.     

基于全球价值链分解视角的离岸外包绩效研究

本文基于全球价值链分解和离岸外包分解的视角,构造了八种离岸外包率和两个离岸外包的绩效评价指标,采用系统广义矩估计法对我国服务业离岸外包绩效进行了实证研究。研究结果表明:(1)初级产品和资源离岸外包对服务业全球价值链参与度和相对位置存在负向影响;(2)劳动密集型、资本密集型和知识密集型制造离岸外包对服务业全球价值链参与度和相对位置存在负向影响;(3)知识密集型服务离岸外包对服务业全球价值链参与度和相对位置存在正向影响。研究认为我国应着力促进服务业,尤其是知识密集型服务业的发展,提升服务外包的发包层次和规模,提高制造业与服务业的产业融合度,进一步强化服务业的自主创新,优化服务业发展结构。