VC.net/GS选项分析

网络上最危险的攻击手段莫过于缓冲区溢出攻击。从时间上看，缓冲区溢出这种攻击手法已经出现了20年，但是，从Windows到Linux，从操作系统、数据库服务器到工具软件，仍有新的缓冲溢出漏洞被发现和被蠕虫或者病毒利用，人们不得不考虑更多的解决方案。尽可能深入的分析VC ．net中用来抵御缓冲区溢出的／GS选项。     

基于缓冲区溢出的蠕虫病毒的研究与实现

研究了基于缓冲区溢出技术的蠕虫病毒的原理和实现.蠕虫包括扫描、感染和传播模块,扫描模块通过全连接方式发现开放目的端口的主机地址,感染模块利用能够使缓冲区溢出的exploit,发送能够取得当前用户权限的shellcode,执行sheIlcode后,利用、winsock API函数发送后续攻击命令,并且利用后门对被攻击主机系统进行操作,最后通过取得的权限执行传播模块,达到自动传播的目的.     

结合逆向工程和fuzz技术的Windows软件漏洞挖掘模型研究

Windows软件漏洞挖掘已经成为网络安全技术一个重要的组成部分。结合逆向工程和fuzz技术,提出了一个全新的Windows软件漏洞挖掘模型：首先分别介绍了逆向工程和fuzz技术主要特点和研究内容,接着介绍了结合逆向工程和fuzz技术的软件漏洞挖掘模型原理,最后展示了利用这个模型进行漏洞挖掘的实例演示。     

Android系统中Wi-Fi网络的研究与实现

对时下流行的Android系统中Wi-Fi网络的实现技术进行了研究。在详细分析Wi-Fi模块的系统组成的基础上,从系统使用及编程者的角度,深入剖析了Wi-Fi模块的初始化、启动、接入点扫描和IP地址配置的实现,通过移植及调试Wi-Fi驱动程序,成功验证了Wi-Fi网络的实现过程。     

基于ARP协议的网络主机地址的识别技术研究

从移动IPv6工作原理入手，IP地址管理器是针对越来越严重的IP地址盗用现象而设计的一套有效的监控和管理IP地址的方案。分析与研究IP地址管理器中的信息收集模块后，以Winpcap为开发工具，利用ARP，附等协议完成对网络中活动主机的扫描以及信息（主机名、MAC、操作系统）的收集和识别。模块实现了对网络的自动实时监控，有效地提高了管理效率。     

基于网络的入侵检测系统分析与设计

分析了入侵检测系统及NIDS的基本原理.利用WinPcap驱动和Libnids技术在Windows环境下对网卡进行编程,从网络数据包的捕获和分析着手,设计并实现了一个网络入侵检测系统.     

一种基于代码分发机制的主动网络实现方案

针对当前主动网络的两种实现方案各自的优缺点，设计了一种基于代码分发机制的主动网络的实现方案，利用代码分发、存储、请求加载及密钥服务等技术保证了主动报文安全、便捷、高效的传输。同时，采用传统报文格式，通过主动节点对主动报文和被动报文进行区分，采取不同的处理方式，从而保证了与现有网络的兼容。该实现方案既具备主动网络系统基本的特征又具有其自身的特征。     

基于SVG和Hibernate的地下管网图形显示

对传统的网络地图发布方式进行分析,介绍了一种使用SVG技术来构建地下管网图的有效方法.与栅格图片相比,SVG应用于网络地图,可以减轻网络和服务器上的负担.为了共享已有的地下管网数据,描述了一个基于Hibernate技术的实现框架.     

青海省防汛抗旱信息网络系统工程设计

主要从青海省防汛抗旱信息网络工程建设的目标，主要任务、设计思想、拓拟结构，系统的组成，网络设备技术规范进行了概述；对系统安全、虚拟网络（VLAN）、交换、路由、网络管理等技术从实现方法上进行了分析；对主干交换机、路由器、集线器、服务器、防火墙等网络关键设备进行了严格的选型；对系统决策应用平台的设计提出了新的思路。     

台风时空过程的网络动态分析技术与示例

网络技术的发展为实时动态地显示时空过程信息和在线分析提供了可能,也为气象海洋等灾害性过程的预警和防灾决策支持提供了可能;另一方面,随着网络的普及化,公众对GIS时空分析模型的网络实时集成和可视化表达提出了迫切需求。本文在分析网络GIS最新发展趋势的基础上,针对时空过程的动态特性,探讨了时空过程网络实时动态查询、分析和可视化的技术方法,并以台风过程为代表,设计了适合网络环境的台风过程数据的有效组织形式和直观的表达方式,构建了一个台风过程网络系统原型,具备了时空过程查询、可视化、简单的空间分析等功能,实现了台风过境的时空影响网络在线分析。系统基于ArcGIS Server在.NET环境下实现。实践证明本文提出的时空过程网络动态技术,可快捷地实现时空过程信息的网络发布、过程的在线影响分析及其时空动态可视化,可为台风、海啸等灾害性过程的信息提供和灾害评价等提供空间技术支持。     

Vulnerability and sustainable development mode of coal cities in Northeast China

In this study, by carrying on the spot investigation to the seven coal cities in Northeast China and interviewing with the local authority and the residents, the authors definite the vulnerability that is closed to exposure, sensitivity and resilience, and set up vulnerability model of coal cities in Northeast China. At the same time, the authors broadly illustrate how the components of natural-social-economic system act in the coal area, so as to probe the ways to reduce vulnerability more effectively, such as preferential national policy and so on. Furthermore, the article studies the relationship between vulnerability and sustainable development. Vulnerability is a spatio-temporal function of sustainable development. The regional sustainable development refrains the spiral ascending of vulnerability. And the regional vulnerability and sustainable development appear in turn. Then the article analyzes the natural vulnerability, social vulnerability and economic vulnerability of coal cities in Northeast China. At last, combing vulnerability model and situation of coal cities in Northeast China, the authors put forward regional technology innovation mode, multi-dimension structure transformation mode, attracting investment mode and recycling economy mode to reduce vulnerability.     

Site-specific Vulnerability Assessment for Debris Flows： Two Case Studies

Introduction Here vulnerability is related to the hazard-affected bodies including human beings and material objects. Without hazard-affected bodies, there would be no disasters. Disaster is a combination of the hazard-affected bodies and the hazard-forma…     

西江流域生态脆弱性时空分异及其驱动机制研究

流域作为人口、资源、资本都相对集中的水文单元,其生态系统结构的稳定性是区域社会经济发展的基础。流域在生态系统演变及人类频繁活动的共同胁迫下,生境敏感性增强,脆弱易损。本文以广西西江流域为例,通过对其生态脆弱性成因机制分析,依循“敏感性-压力度-恢复力”评估框架,选取11个指标构建完成流域生态脆弱性评价指标体系,以GIS技术为支撑,采用空间主成分分析法和差值法对生态脆弱性指数进行计算与分析,探究2000-2010年广西西江流域生态脆弱性时空变化特征。基于地理探测器的因子探测和交互探测模块分析各影响因子对流域生态脆弱性结果的解释力及因子交互作用对流域生境脆弱性变化的驱动机制。结果表明:① 2000-2010年,广西西江流域生态脆弱性指数多年平均值为0.69,整体处于中度脆弱状态。空间上,流域生态脆弱性表现为中部高于四周,由城市核心区往外逐步减弱的格局特征,研究时段内流域生态脆弱性综合指数多年平均值最大的为贵港市（3.40）,最小的为百色市（2.23）;时间上,10年间,流域整体生态脆弱性呈现轻微恶化的趋势,2005年流域中部及东部地区受高温影响,导致2005年流域生态脆弱性指数整体高于其他两年;② 6个因子对流域生态脆弱性的解释力强度为生物丰度指数（0.475）>高温季节温度（0.340）>植被覆盖度（0.211）>NPP（0.183）>降雨侵蚀力（0.098）>汛期降雨量（0.030）,因子交互协同作用后对结果解释力增强。     

An indicator-based approach to assess village-level social and biophysical vulnerability of agriculture communities in Uttarakhand,India

With the growing recognition to myriad forms of current and future threats in the mountain agriculture systems,there is a pressing need to holistically understand the vulnerability of mountain agriculture communities.The study aims to assess the biophysical and social vulnerability of agriculture communities using an indicator-based approach for the state of Uttarakhand,India.A total of 14 indicators were used to capture biophysical vulnerability and 22 for social vulnerability profiles of15285 villages.Vulnerability analysis was done at village level with weights assigned to each indicator using Analytical Hierarchical Process(AHP).The results of the study highlight the presence of very high biophysical vulnerability(0.82 ± 0.10) and high social vulnerability(0.65 ± 0.15) within the state.Based on the results,it was found that incidences of high biophysical vulnerability coincide with presence of intensified agriculture land and absence of dense forest.Higher social vulnerability scores were found in villages with an absence of local institutions(like Self Helping Groups(SHGs)),negligible infrastructure facilities and higher occupational dependence on agriculture.A contrast was observed in the vulnerability scores of villages present in the three different altitudinal zones in the study area,indicating respective vulnerability generating conditions existing in these three zones.Biophysical vulnerability was recorded to be highest in the villages falling in the lower zone and lowest in the upper zone villages;whereas,social vulnerability was found to be highest in the middle zone villages and lowest in lower zone villages.Our study aids policy makers in identifying areas for intervention to expedite agriculture adaptation planning in the state.Additionally,the adaptation programmes in the region need to be more context-specific to accommodate the differential altitudinal vulnerability profiles.     

关中盆地地下水脆弱性评价指标体系的探讨

地下水脆弱性是近几年来出现的新概念，在分析国内外有关地下水脆弱性研究现状的基础上根据关中盆地的地貌、地质、水文地质以及环境问题，探讨了地下水脆弱性的概念，提出了关中盆地地下水脆弱性评价指标体系。     

Seismic vulnerability assessment of urban buildings and traffic networks using fuzzy ordered weighted average

Urban buildings and urban traffic network are considered as the vital arteries of cities which have particular effects especially after the crisis in the search and rescue operations. The aim of this study is to determine the vulnerability of urban areas especially, buildings and traffic networks using multicriteria geographic information systems and decisionmaking methods. As there are many effective criteria on the seismic vulnerability that they have uncertain and vague properties, the method of this paper is applying fuzzy ordered weighted average(OWA) to model the seismic vulnerability of urban buildings and traffic networks in the most optimistic and pessimistic states. The study area is district 6 of Tehran that is affected by the four major faults, and thus will be threatened by the earthquakes. The achieved results illustrated the vulnerability with different degrees of risk levels including very high, high, medium, low and very low. The results show that in the most optimistic case 14% and in the pessimistic case 1% of buildings tolerate in very low vulnerability. The vulnerability of urban street network also indicates that in the optimistic case 12% and in the pessimistic case at most 9% of the area are in appropriate condition and the North and NorthEast of the study area are more vulnerable than South of it.     

Ecological vulnerability analysis of Tibetan towns with tourism-based economy: a case study of the Bayi District

This paper provides a generalizable mode for the ecological vulnerability evaluation for tourism planning and development in high mountain areas. The Bayi District located in southeastern Tibet is taken as a typical town to study the conflict between the protection of natural ecological environment and the exploitation of tourism resources. Based on the Sensitivity-Recovery-Pressure (SRP) framework, a set of vulnerability evaluation systems for plateau tourism regions were developed. The spatial principal component analysis (SPCA), remote sensing and GIS technologies were integrated to apply for spatial quantification of evaluation index system. The ecological vulnerability of the Bayi District was divided into five levels: potential, mild, moderate, severe, and extreme, and our results showed that significantly severe and extreme vulnerability areas were mainly distributed throughout the southwestern and central northern alpine pasture and glacial zones. Potential and mild vulnerability areas were mainly distributed in the vicinity of the Yarlung Zangbo River tributary basin. Then three tourism development and environmental protection zones were classified and appropriate measures for the protection were proposed. It also provides a reference for the spatial distribution of a range of areas that require different protection measures according to ecological vulnerability classification.     

一种高速网络下IDS溢出数据包的处理模型

对匹配规则和被检数据包，都分为实时在线检测部分和延时离线补检部分，来选择性地溢出一些不重要的包和规则，避免随机丢包。同时把这些溢出的包保存下来，待系统有多余处理能力时，再调出来检测。这样既避免了随机丢包造成的安全隐患，又在没有增加硬件的情况下，提升了系统的检测性能。     

Vulnerability of water resources and its spatial heterogeneity in Haihe River Basin,China

To manage water resources effectively, a multiscale assessment of the vulnerability of water resources on the basis of political boundaries and watersheds is necessary. This study addressed issues on the vulnerability of water resources and provided a multiscale comparison of spatial heterogeneity under a climate change background. Using improved quantitative evaluation methods of vulnerabil- ity, the Theil index and the Shannon-Weaver index, we evaluated the vulnerability of water resources and its spatial heterogeneity in the Haihe River Basin in four scales, namely, second-class water resource regions （Class II WRRs）, third-class water resource regions （Class III WRRs）, Province-Class II WRRs, and Province-Class III WRRs. Results show that vulnerability enhances from the north to south in the different scales, and shows obvious spatial heterogeneity instead of moving toward convergence in multiscale assessment results. Among the Class II WRRs, the Tuhai-Majia River is the most vulnerable area, and the vulnerability of the Luanhe River is lower than that of the north of the Haihe River Basin, which in turn is lower than that of the south of the Haihe River Basin. In the scales of Class III WRRs and Province-Class III WRRs, the vulnerability shows obvious spatial heterogeneity and diversity measured by the Theil index and the Shannon-Weaver index. Multiscale vulnerability assessment results based on political boundaries and the watersheds of the Haihe River Basin innovatively provided in this paper are important and useful to characterize the real spatial pattern of the vulnerability of water resources and improve water resource management.