加强信息安全风险评估工作的研究

针对目前异构数据库间通信的问题,提出了种基于XML的数据交换技术.在具本实现过程中,进一步研究了XML模式与关系模式相互转换的方法,并给出了转换算法和转换规则。同时对XML模式中的语义约束同关系模式中的完整性约束之间的相互转换方法进行了分析。     

How does Bennett Woods Elementary School produce such high reading and writing achievement?

The authors developed a grounded theory about how a school serving relatively advantaged children produces high reading and writing achievement compared with schools serving similar populations of students. The school's faculty is reading and writing focused, and students experience many books as they receive explicit, demanding instruction (i.e., about how to read words, comprehend, write) connected to content learning. The school offers a positive, motivating environment. In sum, many elements that potentially supported achievement were identified, including explicit teaching of skills in the context of much reading, writing, and content learning, which is consistent with balanced perspectives on reading and writing development. A major hypothesis in the grounded theory is that even with relatively advantaged populations, great efforts may be required to produce high reading and writing achievement. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Self-regulated learning through writing on computers: Consequences for reading comprehension

The overall aim for the present study was to analyze the consequences for reading ability among the children of a computer supported self-regulated learning environment in grade two. By means of a quasi-experimental design in a natural setting, an experimental group (n = 39) was compared to a control group from a national sample (n = 3409) on reading comprehension. The statistical analyses showed that the experimental group achieved better on reading comprehension both as a group (p < .001) as well as girls (p < .001) and boys (p < .05) separately. The proportion of high achievers was higher, and the proportion of low achievers was lower in the experimental group. In order to explain the level of reading comprehension in the experimental group Structural Equation Modelling (SEM) was used. The main explanatory factor for reading comprehension was writing with β = .44. As a tentative conclusion it was suggested that the extended writing in combination with the self-regulated learning environment can promote reading comprehension in grade two, whereas home literacy had no impact on reading comprehension in this context.     

GENERATING AUTOMATIC FUZZY SYSTEM FROM RELATIONAL DATABASE SYSTEM FOR ESTIMATING NULL VALUES

There are many methods trying to do relational database estimations with a highly estimated accuracy rate by constructing a fuzzy learning algorithm automatically. However, there exists a conflict between the degree of the interpretability and the accuracy of the approximation in a general fuzzy system. Thus, how to make the best compromise between the accuracy of the approximation and the degree of the interpretability is a significant study of the subject. In order to achieve the best compromise, this article attempts to propose a simple fuzzy learning algorithm to get a positive result in the relational database estimation on the real world database system, including partition determination, automatic membership function, and rule generation, and system approximation.     

FLEXIBLE ADJUSTMENT OF DATA: AN EXERCISE IN RELATIONAL ALGEBRA

Abstract

Databases may exhibit many forms of incompleteness. This paper explores methods for overcoming incompleteness in the form of missing tuples. Specifically, algorithms are investigated for replacing a relation that is known to be incomplete with a superset. Of particular interest are algorithms that make available at any time a current approximation and with the property that the approximate solution improves monotonically with computing time. Although this paper concentrates on rule matching in rule-based systems, application of these and similar methods to problems of knowledge discovery in incomplete databases is also discussed.     

Factors associated with distressing electronic harassment and cyberbullying

Electronic harassment and cyberbullying can take various forms and involve a range of perpetrators. This study utilised survey results from 1673 New Zealand students aged 12–19 years to explore electronic harassment on the internet and mobile phones and the distress associated with it. Overall, a third of participants reported electronic harassment in the prior year, with half (53.7%) rating it as distressing. Specific hypotheses and findings were that: mobile phone harassment would be more common and distressing than internet harassment, this was supported with 7% more participants reporting mobile phone harassment and 5.5% more reporting distress from it compared to internet harassment; females would report more harassment than males, this was supported for mobile phone harassment as females’ odds of harassment was approximately twice that of males (however the hypothesis did not hold for internet harassment); females would report more distress from harassment, this was supported for both internet and mobile phone harassment, with females’ odds of distress approximately twice as high as males; that some forms and perpetrators would be associated with more distress than others, again this was supported with the most distressing form of mobile phone harassment being direct verbal aggression and for harassment on the internet being rumour spreading. The study also found a preponderance of harassment from school peers. As predicted there were multiple interactions between the harassment forms and perpetrators and gender. These results highlight important differences in how harassment is delivered and experienced across the mobile phone and internet modalities. The findings point to the need to explicitly consider mobile phone harassment, as well as better ways to tailor interventions to address distressing harassment. Schools are well placed to address electronic harassment alongside other bullying interventions.     

ITS中基于模糊关系数据模型的知识表示及推理研究

使用模糊关系模型讨论建立学科知识库的方法,并用隶属度函数及模糊中心数等方法描述知识点属性,以知识点的模糊关系建立知识库,并且,就实现基于模糊关系数据模型推理过程,给出了两个关键性的算法。     

基于关系型发散的黎曼流形分类图像识别

针对图像识别中传统的嵌入流形算法通常只考虑切线空间却忽略了流形结构以致不能准确建模的问题,提出一种基于关系型发散的黎曼流形分类(RMC)算法。首先从底层黎曼流形建立训练集,并在流形上建立一组表示黎曼点的参考点;然后,借助于最近提出的斯坦因发散计算黎曼点与各个类之间的相似性,从而有效地将流形分类问题转换成寻找合适的相似空间问题;最后,利用经典的线性判别分析进行特征提取,最近邻分类器完成最终的分类、识别。通过纹理分类、人脸识别、人体识别实验验证了所提算法的有效性及高效性。实验结果表明,相比其他几种较为先进的流形算法,提出的算法不仅提高了识别率,同时大大减少了训练、分类所耗时间,有望应用于实时图像识别系统。     

基于现代物流理念的旅游产业整合

本文首先分析了我国2003—2012年物流业、旅游业的发展状况,然后利用灰色关联度分析法测定了物流业与旅游业之间的关联度,得出两者之间具有较大关联性的结论。通过辨析现代物流与旅游产业整合的概念,对如何运用现代物流理念促进旅游产业整合提出了对策建议。     

创新科普形式 增强传播效果

一般的传播模式由于传播链条太长,无法形成或较快形成反馈,缺少交流的亲切感与成就感,因而很难引起公众的学习兴趣。首都科学讲堂传播模式的成功在于它有一个“核心动力”——注重平等交流的现场活动,并通过沟通、对话、交流,调动公众的主观能动作用,促进其主动地接受。最终,形成了一种互为因果的关系。理解促述接受,接受又加深理解,进而带动周边“因素”形成良好的社会传播效应。