远程辅助教学系统的研究

本文讨论了网上远程系统的智能系统模型和实现方法。实现教师和学生的远程交互,对学生学籍进行管理,并有测试功能便于学生自测,可记录学生的平时成绩供教师参考。     

Discrete Multicolour Random Mosaics with an Application to Network Extraction

We introduce a class of random fields that can be understood as discrete versions of multicolour polygonal fields built on regular linear tessellations. We focus first on a subclass of consistent polygonal fields, for which we show Markovianity and solvability by means of a dynamic representation. This representation is used to design new sampling techniques for Gibbsian modifications of such fields, a class which covers lattice‐based random fields. A flux‐based modification is applied to the extraction of the field tracks network from a Synthetic Aperture Radar image of a rural area.     

A network algorithm for the exact treatment of the 2×k contingency table

A common statistical problem encountered in biomedical research is to test the hypothesis that the parameters of k binomial populations are all equal. An exact test of significance of this hypothesis is possible in principle, the appropriate null distribution being a normalized product of k binomial coefficients. However, the problem of computing the tail area of this distribution can be formidable since it requires the enumeration of all sets of k binomial coefficients whose product is less than a given constant. Existing algorithms, all of which rely on explicit enumeration to generate feasible binomial coefficients     

Extreme probabilities for contingency tables under row and column independence with application to fisher's exact test

Theorerms are proved for the maxima and minima of IIR_i!/IIC_j!/T!II_yij ! over r× c contingcncy tables Y=(y_ij) with row sums R₁,…,R_r, column sums C₁,…,C_c, and grand total T. These results are imlplemented into the network algorithm of Mehta and Patel (1983) for computing the P-value of Fisher's exact test for unordered r×c contingency tables. The decrease in the amount of computing time can be substantial when the column sums are very different.     

中国城市化与生态环境协调发展预警系统研究

本文构建了城市化与生态环境协调发展预警指标体系,并对1991～2010年中国城市化与生态环境的协调度进行了测算及预测,根据协调度建立了预警系统,并对90年代以来中国城市化与生态环境的协调发展进行了分析。结果表明,2007年以来,中国的生态环境不断恶化,城市化与生态环境的协调度不断下降,保护生态环境成为城市化进程中的重要问题。     

Designing and integrating composite networks for monitoring multivariate gaussian pollution fields

Networks of ambient monitoring stations are used to monitor environmental pollution fields such as those for acid rain and air pollution. Such stations provide regular measurements of pollutant concentrations. The networks are established for a variety of purposes at various times so often several stations measuring different subsets of pollutant concentrations can be found in compact geographical regions. The problem of statistically combining these disparate information sources into a single 'network' then arises. Capitalizing on the efficiencies so achieved can then lead to the secondary problem of extending this network. The subject of this paper is a set of 31 air pollution monitoring stations in southern Ontario. Each of these regularly measures a particular subset of ionic sulphate, sulphite, nitrite and ozone. However, this subset varies from station to station. For example only two stations measure all four. Some measure just one. We describe a Bayesian framework for integrating the measurements of these stations to yield a spatial predictive distribution for unmonitored sites and unmeasured concentrations at existing stations. Furthermore we show how this network can be extended by using an entropy maximization criterion. The methods assume that the multivariate response field being measured has a joint Gaussian distribution conditional on its mean and covariance function. A conjugate prior is used for these parameters, some of its hyperparameters being fitted empirically.     

新时期乡村知识分子的新变化

新时期的中国乡村,在内外多重力量的作用下,快速实现着从传统向现代的转变。在乡村经济政治文化不断发展的过程中,乡村知识分子这一群体在工作身份、价值观念、社会声望、知识结构、居住地域上都发生着历史性的新变化。充分认识乡村知识分子的这些新变化,不仅有助于我们在理论上深化对乡村知识分子的理解,而且有助于在实践中更好地发挥这一群体的社会作用。     

中华传统美德的个体性展示

中华民族传统美德是中华民族的优秀遗产,需要中华民族一代一代人不断传扬下去。在这个过程中,社会全方位的美德倡导播撒,是个体展示的最佳环境和前提,同时又是个体展示的机遇。但社会展示只是一个形式和要求,社会展示要通过一个个个体展示落到实处,个体性展示才是具体可视和可操作性的,是社会展示的承载,没有这个承载,社会弘扬与展示只是一个空壳,无根无基。由此,强化个体性展示,对个体性展示提出更高更具体要求,是中华民族传统美德弘扬与践行的根本所在。     

基于最大收益的无线虚拟网络重映射算法

针对无线环境的动态性及虚拟网络请求到达与离开的随机性,使得物理网络负载分布不均衡,导致后续请求的接受率降低的问题,提出一种无线网络虚拟化中的两阶段重映射算法（two stages reconfiguration scheme for wireless network virtualization,TR-WNV）。该算法通过第1个阶段选出合适的虚拟网络进行重映射,接着在第2个阶段按照优先级对已选出的虚拟网络进行重映射,并根据离散度来判断每次映射效果。最后,通过仿真对算法进行验证,结果表明该算法在保证虚拟网络请求收益最大化同时,有效提高了虚拟网络请求接受率,实现整个底层网络的负载分布均衡。     

14至18世纪中古后期至近代早期西非社会演进与当地伊斯兰化进程间的关系

14至18世纪西非经历了帝国的瓦解,国家和社会重新整合的历史过程。在行政机构、经济运作方式、宗教、文化等方面都有了新的发展。中央集权化趋势成为国家政治发展方面的主流,经济、贸易活动的形式更加丰富多样。与此相对应,伊斯兰教和当地传统宗教文化也都有了很大的发展,其中伊斯兰教的发展对西非日后的历史进程影响更加深远。在没有官方支持的情况下,伊斯兰教注重向民间社会的渗透,教团组织开始普及,并在随后与苏菲主义合流,形成了苏菲主义教团,建立起了自己的社会、经济基础,当地伊斯兰文化得到了整理和发展,教士们提出了针对社会问题的改革主张,并在上几内亚地区付诸行动,从理论和实践上为未来的西非历史进程奠定了基础。