IPTABLES防火墙图形配置系统

通过对linux提供的netfilter／iptables内核防火墙系统的分析，利用linux提供的gtk软件编写出防火墙图形配置界面。这个方式简化了系统管理员对防火墙的配置和管理。     

基于CC的防火墙安全功能分析

防火墙是网络安全的核心手段。依据基于CC（Common Criteria）制订的国家标准——包过滤防火墙安全技术要求和应用级防火墙安全技术要求，提出每项安全功能要求对应的实际安全措施，并分析当前防火墙未实现的安全功能要求。     

Linux内核处理IPv6报文的重复分片存在的问题及解决对策

介绍了IPv6分片首部，关注Linux内核用于实现重组的代码中和重复分片有关的部分。通过详细分析Linux内核接收IPv6分片报文，然后用不同方法进行重组的若干重要函数，发现了Linux内核处理重复分片存在的问题，并给出了解决方案。此外，指出了4种伪造的分片报文对接收端的影响并给出了应付这些伪造报文的对策。     

Linux 实时性能瓶颈分析

从调度机制、信号量和消息队列3方面将Linux、RT-Linux和VxWorks进行了综合对比，并结合测试用例得出了影响Linux实时性能的瓶颈。最后从上述3方而给出了Linux实时性能改造的可行性办法。     

基于Linux的嵌入式闸门智能监控系统

介绍了基于Linux操作系统的嵌入式闸门智能监控系统，探讨了针对该系统的Linux个性化定制方法．并对今后采用JFFS文件系统做了展望。     

防火墙分布集中管理应用研究

是针对企业网网络安全防护的应用研究，采用防火墙分布集中管理技术解决以往单个边界防火墙或个人防火墙的局限性。分析了防火墙分布集中系统结构，对应用性研究没计作了概括性描述。     

气象业务网络安全及防火墙的设计和应用

介绍了各种类型防火墙和它们的结构。通过湖北省新型业务网络防火墙建设的实例，探讨了如何应用防火墙技术提高气象业务网络的安全可靠性。同时，对湖北省新型业务网络防火墙安全性进行了初步的评价。     

Linux嵌入式系统根文件系统的选择与制作

Linux操作系统做为嵌入式系统近年应用越来越广泛，Linux根文件系的装载是Linux内核启动期间进行的最后操作之一，它是Linux嵌入式系统的一个重要组成部分，系统地分析了Linux嵌入式系统根文件系统的类型，内容选择以及制作方法。     

个人防火墙突破技术研究与防范措施

首先分析了Windows的网络结构,并在此基础上分析了包括SPI封包截获技术、TDI过滤驱动、NDIS钩子驱动在内的各种个人防火墙技术,然后根据个人防火墙特点以及技术缺陷,给出了几种穿透防火墙的方法以及相应的代码,最后提出改进个人防火墙的一些建议。     

深度包检测技术在防火墙中的应用探讨

介绍了深度包检测技术的背景、特点和原理，分析了该技术与普通防火墙技术的不同以及在防火墙中的应用。     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied     

Advances in Polar Science CONTENTS(Volume 25,2014)

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Guide to Authors： Journal of Mountain Science

<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet.     

Journal of Mountain Science(JMS)

<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by     

Relationship of Arctic sea ice and Northern Hemispheric 500 hPa Polar vortices

Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated.     

Author Index for Journal of Mountain Science Volume 11,2014,pp 1-1656

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Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research