近10年《人大复印资料·体育》载文分析

运用文献资料研究法、数理统计法和比较分析法,对1999-2009年1月10余年间,《人大复印资料.体育》全文转载体育学论文信息进行统计,并进行多角度分析,发现:10余年来,《人大复印资料.体育》载文的产生地区主要分布于经济发达、信息流通活跃的东部大城市;载文研究内容有着比较明显的时代特点;载文的作者单位来源,与所在单位的科研实力基本呈现一致的状况;在载文作者学历方面,拥有博士、硕士学位人数占总数的1/5;载文所属的国家社会科学基金数量和国家体育总局基金数量历年来呈上升趋势;产出科研成果的年龄,呈正态分布,出现一个从弱增强,然后逐渐减弱的过程。     

Dynamical analysis and optimal control simulation for an age-structured cholera transmission model

Cholera is an infectious disease caused by the bacterium vibrio cholerae, which can lead to widespread epidemics in the deterioration of public health systems or the associated infrastructure. Vaccination and water sanitation are two well-known methods for the prevention and intervention of cholera epidemics. In this paper, we propose an age-structured cholera model that incorporates both the environment-to-human and human-to-human transmission pathways and that includes host vaccination and water sanitation as disease control measures. We rigorously investigate the threshold dynamics of this model using the basic reproduction number derived from our analysis. Meanwhile, we perform an optimal control study to explore cost-effective intervention strategies for cholera. Our numerical simulation results show that the outcome of the optimal control is shaped by the complex interactions among the age structure of the hosts, the costs of the control measures, the transmission modes of the disease, and the different approaches of cholera intervention.     

Detection of replay attacks in cyber-physical systems using a frequency-based signature

This paper proposes a frequency-based approach for the detection of replay attacks affecting cyber-physical systems (CPS). In particular, the method employs a sinusoidal signal with a time-varying frequency (authentication signal) into the closed-loop system and checks whether the time profile of the frequency components in the output signal are compatible with the authentication signal or not. In order to carry out this target, the couplings between inputs and outputs are eliminated using a dynamic decoupling technique based on vector fitting. In this way, a signature introduced on a specific input channel will affect only the output that is selected to be associated with that input, which is a property that can be exploited to determine which channels are being affected. A bank of band-pass filters is used to generate signals whose energies can be compared to reconstruct an estimation of the time-varying frequency profile. By matching the known frequency profile with its estimation, the detector can provide the information about whether a replay attack is being carried out or not. The design of the signal generator and the detector are thoroughly discussed, and an example based on a quadruple-tank process is used to show the application and effectiveness of the proposed method.     

Analysis and design of quadratic parameter varying (QPV) control systems with polytopic attractive region

This paper proposes a gain-scheduling approach for systems with a quadratic structure. Both the stability analysis and the state-feedback controller design problems are considered for quadratic parameter varying (QPV) systems. The developed approach assesses/enforces the belonging of a polytopic region of the state space to the region of attraction of the origin, and relies on a linear matrix inequality (LMI) feasibility problem. The main characteristics of the proposed approach are illustrated by means of examples, which confirm the validity of the theoretical results.     

Control of a time-varying hypersonic vehicle model subject to inlet un-start condition

A performance-guaranteed fault-tolerant controller is proposed for air-breathing hypersonic vehicles (AHVs) with synthetical consideration on time-varying uncertain parameters and inlet un-start condition. Different from most of the existing strategies for AHVs, the possible time-varying uncertain parameters in the control-oriented model are accommodated, which makes the resulting controller more adaptable to a real flight. Moreover, the velocity-dependent constraint on angle-of-attack, which is an important factor keeping the scramjet away from inlet un-start, is taken into account. With the utilization of barrier functions in adaptive design, velocity and altitude tracking errors are bounded by specific performance functions. Relevant analysis shows that the tracking performance can be further improved by proper adjustments on design parameters. The effectiveness of our proposed controller is evaluated through a simulation study.     

广州大学城高校图书馆用户信息资源需求特点与满意度分析

文章采用文献调查和问卷调查研究方法,对广州大学城高校图书馆用户的信息需求和信息满意度进行研究和分析,提出了开展信息资源共建共享是广州大学城高校图书馆发展的必然方向。虽然目前要实现信息资源共建共享还存在较大困难,客观上,其共建共享活动尚处于初级阶段;主观上,用户对共享型信息服务的收费问题持慎重态度,但是用户对图书馆信息资源的总体满意度较高,对信息资源的共建共享有着强烈的需求,因此在大学城高校间开展资源共建共享具有强大的内在动力。     

积极开展培训工作,推动共享工程持续发展——贵州省文化共享工程培训工作综述

简要介绍了贵州省文化共享工程培训工作的特点和措施。     

整合长三角港口资源 加快推进上海国际航运中心建设

加快建成以上海为中心、以江苏和浙江为两翼的上海国际航运中心有利于提升中国在全球航运体系中的地位。当前,长三角港口吞吐量增幅放缓,交通一体化加剧港口间的竞争,长三角港口合作难度日益加大。应从长三角整体利益出发,整合长三角港口资源,打造一体化的集疏运网络体系和现代航运服务体系。     

关于中国微生物组数据中心建设的思考

近年来,美国、欧盟都陆续启动了微生物组相关的研究项目。但微生物组大数据的收集、存储、功能挖掘和开发利用一直是制约微生物组发展的核心问题。文章分析了我国目前在微生物组数据管理中存在着标准不统一、缺乏跨领域的数据整合、高质量的参考数据库和数据的深度挖掘技术等问题,提出适时启动"中国微生物组"计划,建立中国微生物组数据中心,在微生物组数据标准化的基础上,建立微生物组大数据计算、存储和共享平台,开发微生物组大数据挖掘的新方法,实现我国微生物组数据资源的系统管理和高效利用。     

中心/外围:一个比较教育的分析框架

中心/外围分析框架是探讨全球教育发展不均衡的一个基本理论框架.按照这一框架,中心与外围构成了当今国际教育不均衡格局中对立的两极:发达国家与发展中国家,二者之间构成一种控制与依附的关系.这种不均衡的结构性关系在一定程度上阻碍了发展中国家教育的发展,因此发展中国家教育发展的基本出路在于走"内生发展"的道路.