An analysis of specialist and non-specialist user requirements for geographic climate change information

The EU EuroClim project developed a system to monitor and record climate change indicator data based on satellite observations of snow cover, sea ice and glaciers in Northern Europe and the Arctic. It also contained projection data for temperature, rainfall and average wind speed for Europe. These were all stored as data sets in a GIS database for users to download. The process of gathering requirements for a user population including scientists, researchers, policy makers, educationalists and the general public is described. Using an iterative design methodology, a user survey was administered to obtain initial feedback on the system concept followed by panel sessions where users were presented with the system concept and a demonstrator to interact with it. The requirements of both specialist and non-specialist users is summarised together with strategies for the effective communication of geographic climate change information.     

现代汉语介词短语边界识别研究

汉语中介词结构右边界歧义是汉语结构歧义中最突出的现象之一,这给汉语的句法分析带来了很大的困难。本文研究的目标是:在不引进复杂的句法分析的前提下实现介词短语边界的自动识别,期望其作为句法分析预处理的一部分为句法分析提供一定的帮助。本文对汉语中最常用的介词“在”进行了实验,封闭测试和开放测试的准确率分别达到97 %和93 %。与前人的同类研究相比,准确率有了较大的提高,解决了过去遗留的一些问题。     

Optimal and self‐tuning weighted measurement fusion Kalman filters and their asymptotic global optimality

For the multisensor linear discrete time‐invariant stochastic systems with unknown noise variances, using the correlation method, the information fusion noise variance estimators with consistency are given by taking the average of the local noise variance estimators. Substituting them into two optimal weighted measurement fusion steady‐state Kalman filters, two new self‐tuning weighted measurement fusion Kalman filters with a self‐tuning Riccati equation are presented. By the dynamic variance error system analysis (DVESA) method, it is rigorously proved that the self‐tuning Riccati equation converges to the steady‐state optimal Riccati equation. Further, by the dynamic error system analysis (DESA) method, it is proved that the steady‐state optimal and self‐tuning Kalman fusers converge to the global optimal centralized Kalman fuser, so that they have the asymptotic global optimality. Compared with the centralized Kalman fuser, they can significantly reduce the computational burden. A simulation example for the target tracking systems shows their effectiveness. Copyright © 2010 John Wiley & Sons, Ltd.     

采用注入法对配电网中性点进行测量

针对配电网中不对称度大的中性点接地方式,提出了采用异频信号注入法对其进行测量,重点分析了其原理并进行详细地理论推导,最后模拟10 kV配电网进行了实验测试.该方法使配电网的谐振频率远离工频50 Hz,有效降低了不对称度大的配电网的位移电压,测量简单,安全可靠.实验结果表明其具有测量精度高、实时性好等特点,具有广阔的应用前景.     

加强信息资源建设搭建数字化资源平台

文章对华北电网公司数字化图书馆的功能特点、资源建设情况及系统采用的关键技术等进行了简要介绍,从侧面论述了该数字化图书馆信息量大、专业性强、技术先进,是各类专业技术人员、管理人员日常工作中获取科技、管理知识的窗口和渠道。     

利用信息化技术实现机房智能化管理

介绍了如何利用目前先进的信息化技术来实现机房的智能化管理。     

实时数据库压缩死区的研究

厂级监控信息系统(SIS)要处理大量的数据,原始数据不处理就去存储,要耗费大量的磁盘空间。介绍了实时历史数据库里的例外报告技术,应用这种技术,对电厂里的数据特性进行了分析。通过大量数据的统计分析,找出数据本身的特性,为例外报告技术死区的设置提供依据。统计了山西漳山电厂2008年10～12月共85 248个数据,得出了某个温度信号的特性,并绘制了相应曲线,死区设置可以将曲线作为参考。     

从水坝工程看我国公众理解工程的问题与对策

At present, the study of “public understanding of engineering” in China has just started, and it can be said that there is adequate research space. Making the public understanding of dams in China as a starting point, this paper analyzes the importance and the present situation of “public understanding of engineering”, and makes some analysis and recommendations on how to promote and facilitate the public understanding of engineering.     

基于熵相关系数的关联性自动判别方法——COCA

数据库自管理、自调优中查询计划的自动优化是目前的关注热点。为保证优化器估值精度,用统计学方法,给出了一种基于熵相关系数的对字段关联性的自动判别的新算法——COCA。该算法有下列特点：（1）限制少,没有卡方检验的频数限制,卡方检验只有在列联表中至少有80%的格子频数大于5的情况下才可信; （2）结果多,卡方检验（CORDS）只判断字段之间是否有关联,新方法可计算字段之间双向的关联程度。实验表明, 新方法更坚固,产生更多的统计信息,可以支持后面更高效、准确地建立直方图。     

Incentive mechanism design of access management policy in affordable housing and analysis

Affordable housing is of much importance for Chinese subsidized housing. However, the implementation of the affordable housing policy is facing several problems. One crucial problem is that the current policy cannot effectively identify high-income applicants who are not qualified to apply for affordable housing. Based on the theory of incentive mechanism design, this paper reveals that the current allocation institution has no incentive compatibility. To remedy this shortcoming, a new model for the management of affordable housing is established. Finally, an example is given to show how the proposed model can help improve the overall process of managing the allocation of affordable housing in China.