基于贝叶斯网络的脆弱性状态评估方法

对网络安全性的量化评估问题是目前网络安全领域的研究热点之一。通过对现有的网络安全模型及量化分析方法的研究和比较,针对影响网络安全性的各项因素的全面脆弱性评估,提出了网络可靠度、脆弱点关键度、脆弱性状态图最低阶最小路集和最低阶最小割集4个具体的评估指标,将基于贝叶斯网络的计算方法引入脆弱性评估中,提出了量化评估计算方法。在此基础上构建了网络实例,使用SPIN验证工具对网络攻击进行模拟并对提出的评估指标及算法进行了分析验证。实验结果表明,文中提出的算法和评估指标集能够正确地量化反映网络的安全状态。     

基于BIM的结构钢筋与机电系统翻模研究——以福州市规划院产业楼为例

基于建筑信息模型（Building Information Modeling, BIM)）概念,以福州市规划设计研究院新建大楼为实际案例,应用Autodesk Revit软件将原有CAD图纸进行BIM结构钢筋和机电模型建置,并提出BIM技术虚拟仿真过程中发现的问题。研究结果表明:（１）BIM技术可实际解决工程常常出现钢筋复杂节点、机电管道碰撞的问题;（２）机电系统进行Revit翻模时,不能按原CAD路径绘制,族库不全需建族完善。该研究成果可为后期施工决策提供技术支持,并有助于相关行业人士学习与借鉴。     

地方本科院校校园广播网络建设的探讨——以凯里学院为例

对传统校园广播网络的优缺点进行分析,比较当今各大厂家推出的各种校园广播网络方案,从地方本科院校的实际出发,提出地方本科院校校园广播网络的建设思路：采用数字音频广播网络技术的专业智能广播软件实现自动化播音和智能化管理,利用有线电视调频智能广播网络连接校区的各个功能区,在各功能区采用传统广播网络广播.     

复半正定矩阵乘积的半正定性

复半正定矩阵是半正定Hermite矩阵的推广。本文利用矩阵的特征值,讨论了复半正定矩阵乘积的半正定性,给出了两个复半正定矩阵的乘积仍是复半正定矩阵的几个充分条件以及两个特殊的复半正定矩阵的乘积仍是复半正定矩阵的充要条件。     

光学衍射仿真软件的设计与实现

分析了在计算机模拟光学衍射过程中,把连续的菲涅耳衍射积分公式离散化为离散菲涅耳变换的方法,并用离散菲涅耳变换计算出任意形状衍射屏的衍射光场．应用MATLAB的GUI工具开发了光学衍射仿真软件,它不仅能模拟常见光孔的衍射,也能对如刀片等复杂形状衍射屏的菲涅耳衍射和夫琅禾费衍射进行模拟,有助于理解衍射光在传播方向上近场衍射和远场衍射的不同和衍射花样的分布特征．     

A new solution to wireless sensor network density control problem

1 Introduction a At present, the research work on wireless sensor networks is based on the assumption that the energy of a sensor node is provided by the battery and can not be regenerated. The lifetime of the node is limited and ephemeral. Hence research…     

论《骆驼祥子》用喻特色

《骆驼祥子》作为老舍先生的代表作,其成功不仅在于刻画的人物形象,揭示的社会意义,还在于作品的语言。在《骆驼祥子》中,老舍先生使用了大量的比喻,这些比喻是老舍先生在深入生活,深入人物内心基础上的匠心独用,体现了老舍语言的一大特点---实而不华,华而不虚,这些比喻具有鲜明的特色---乡土情结,俗而不俗。     

Relays and relations: tracking a policy initiative for improving teacher professionalism

This paper offers a new way of exploring some of the complexities inherent in attempts by policy makers and others to promote educational change. The focus of this study is on the current drive in education policy to alter the basis of teacher professionalism through the application of principles of lifelong learning to teachers’ professional development. Drawing upon data from two studies of the Chartered Teacher (CT) initiative in Scotland the paper examines the formation of successive transmission points as material relays of relations during the process of implementing this policy objective. It explores how three key discursive elements of a professional standard for accomplished teaching: collaborative action, critical reflection and enquiry, and teacher leadership, were progressively recontextualised during the introduction of CT status in schools. The findings indicate some of the conceptual and political struggles involved at the critical junctures where policy implementation requires the movement of a discourse from one social context to another. The paper suggests that a discursive analysis of how a centrally mandated initiative is transmitted can help to promote an understanding of the complexities of this process and increase critical awareness of the issues at stake for those involved.     

解析毕肖普作品中的海洋情结

美国诗人伊丽莎白·毕肖普的作品中曾多次出现大海、沙滩、矶鹞等形象,但因其节制的文风,以及作品中大海多变的形象,让人无法把握其文章的深意。本文试图通过文本细读来解析其作品中"大海、沙滩、矶鹞"所表达的思想内涵。在对海洋的描述中,毕肖普完成了对生命意义的探究,向读者展现出人生渺小中的神奇,平凡中的伟大,并帮助作者更好的认识自我。     

Dissolved oxygen sensor based on sol-gel matrix doped with tris(2,2’-bipyridine)ruthenium dichloride

To establish a immobilization method of oxygen sensitive dye, a dissolved oxygen sensor based on a sol-gel matrix doped with ruthenium complex ([Ru(bpy)3]2+) as the oxygen-sensitive material is reported. The results indicate that the I0 /I100 value of the [Ru(bpy)3]2+-doped in tetraethylorthosilane (TEOS) composite films are estimated to be 10.6, where I0 and I100 correspond to the detected fluorescence intensities in pure nitrogen saturated water and pure oxygen saturated water, respectively. Also, the Stern-Volmer plot shows a very good linearity at low dissolved oxygen concentrations. The response time of the composite films is 5 s upon switching from nitrogen saturated water to oxygen saturated water and 10 s from oxygen saturated water to nitrogen saturated water. The dissolved oxygen sensors based on the ruthenium complex/TEOS composite films exhibit greater sensitivity, stability and faster response time as compared to the existing ones. Furthermore, the thin films possess greatly minimized dye leaching effect.