计算机网络信息安全保密技术探讨

当今社会计算机和互联网具有非常高效的信息数据处理和传输能力,使得网络信息的处理和传输变得十分迅速高效,计算机和互联网在当前社会多个领域中的普遍应用在很大程度改变了人们的工作和生活方式,也显著地提升了企业和单位的生产经营模式和效率。然而互联网信息同时具有信息共享开放、信息传播迅速和信息传输隐蔽等特点,这也导致个人、企业和组织单位信息数据被盗事件时常发生,给个人工作和生活造成困扰,也给企业和组织单位造成不同程度的经济损失。因此,为了确保个人,企业和组织单位信息的安全性,在实际对计算机网络信息技术进行应用中就非常有必要采取一些必要和有效的保密技术措施提升计算机和网络信息数据传输的可靠性和安全性,基于此,文章从多个角度对当前计算机及网络信息安全保密技术相关问题进行详细论述和探讨,并针对计算机网络信息系统安全系数提升的强化措施提出一些建议。     

准确翻译专业名词和术语的重要性日益显现

首先概括性地描述了我国电信和网络技术领域所面临的一个愈来愈大的挑战,即专业名词和术语如何正确翻译、推广和使用,分析指出了此方面问题的根源及其严重性,并特别列举数例分析专业名词和术语翻译缺乏严肃性带来的不良影响和危害。最后,基于思考和分析,提出了若干改善和规范我国专业名词和术语翻译工作的建议。     

北京明朝万达科技有限公司

北京明朝万达科技有限公司是中国领先的内网安全产品和数据保密产品厂商,作为一个专业的网络安全和信息安全产品研发、生产和销售单位,明朝万达致力于内网和数据安全产品的开发,解决国家政府、军队和企业面,瞄的信息安全问题,尤其是政府、军队和企业的内网安全管理、信息保密和数字知识产权保护问题。公司自成立以来,持续高速发展,     

信息通信技术安全标准及其在多媒体和移动通信中的进展与应用(续1)

介绍ICT安全体系结构、模型和框架的基础上,重点对PKI和PMI在ICT安全中的纲领性地位和作用进行了阐述,并结合当前安全需求最迫切,应用最广泛、成长性最好的多媒体业务和移动通信业务,对ICT安全标准在电信业务和应用中的主要问题和用法进行了描述.     

基于云计算的计算机信息安全技术分析

随着云计算技术的快速发展和广泛应用,数据安全、隐私保护和访问控制方面的信息安全需求和挑战,成为云服务提供商和用户面临的主要问题。针对该问题,文中提出了基于云计算的信息安全策略和技术,包括先进的数据加密方法、强化的身份认证机制、精细化的访问控制策略以及基于云环境的入侵检测和防御系统,旨在全面提升云计算环境中的数据保护和系统安全性。实验结果表明,该安全策略和技术在云计算环境中提高了数据保护水平和系统安全性,降低了安全威胁和风险,增强了整个云服务体系的安全性和用户信任度。     

公交智能化技术解决方案

现代智能化交通管理系统采用最先进的GPS定位技术,移动GPRS无线传输技术,计算机网络技术和智能化分析软件,不但可以帮助交通管理部门和运输公司改善经营管理和提高生产效率,还可以显著地减少运行费用,提高调度能力和服务品质,为管理人员和乘客提供及时信息。     

关于计算机网络信息和网络安全应用研究

关于计算机网络信息和网络安全问题,已经成为一种常见的社会性问题,严重影响社会的稳定和个人的生活。文章从计算机网络信息和网络安全相关含义出发,深入分析影响计算机网络信息和网络安全的有关因素和原因,并提出具体措施,提高计算机网络信息和网络安全管理水平。     

中轴见证2000年成都城市发展

中轴线经历每一次社会转型,都会在空间上产生轮回,即从终点又回到起点,引发新一轮的空间发展和重构;中轴线的每一次延伸和推进,都伴随着成都地位和作用的加强和提升,而且总是代表着当时最高的建设成就和水平,成为城市意象中最具有代表性和认同感的要素.     

基于DSP的1kw单相光伏并网锁相技术的研究

针对光伏分布式电源并网系统锁相技术的问题,采用了一种基于DSP的光伏并网系统的数字锁相算法和程序流程设计,根据周期和相位的关系,通过调整周期来实现周期和相位的控制和锁定,方便地实现了对电网电压和光伏发电输出电流信号捕获和锁相的目的。最后制作样机并通过实验证明,该锁相方法设计准确,锁相精度高,保证了光伏并网系统的可靠性和实用性。     

WTO规则视野下的《网络安全法》

中国2016年颁布的《网络安全法》,从立法前的研讨和意见征集,到法律之后公布和推进以及配套制定和实施的细则和指南等,都引起了全球各国和组织的重视和讨论,而国内的单一立法很少能够如此激起国际社会的广泛关注。本文将从WTO规则的角度来分析《网络安全法》是否存在和现行国际法规则的协调或者是合规性的问题。一般意义而言,目前在整个国际法规则的层面,网络空间的国际法和规则并不适用于所有的现行规则,但是现有的国际法规则可以适用于网络空间的管制和网络安全,其中比较有代表性的是WTO规则。普遍意义上,众多网络行为和商务交易相互关联,比如通过网络形式进行交易的贸易活动。     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

卫星遥感温室气体的大气观测技术进展

全球、区域及城市的碳浓度、碳源汇信息是应对气候变化、达成双碳目标、完善国际谈判、支持治理政策制定与执行的重要依据。国际认可的“自上而下” 方法将卫星观测作为基础的通量计算技术, 是验证温室气体排放清单的重要手段。系统介绍了温室气体的卫星探测载荷原理、类别和发展, 以及反演、估算CO2、CH4 和N2O 的浓度和排放通量的方法, 还有探测缺失和误差存在的影响因素等; 分析了对卫星探测温室气体能力提高的迫切需求, 浓度反演和排放量估算精度不足, 以及N2O、氟化物等其他温室气体遥感研究缺乏、地基遥感验证能力薄弱等问题; 最后总结了我国温室气体卫星遥感技术的发展趋势, 主要是面向主被动高时空分辨率卫星的研制应用、高精度多尺度排放量估算(特别针对城市、小区域和点源尺度)、氟化物遥感评估等主题, 以加强对碳排放的量化观测, 并增强对碳循环的理解, 提高感知和应对气候变化的能力。     

法国军用电子信息技术发展研究

法国国防部于2007年6月公布《未来30年远景规划》,其中提出未来防务需要重点发展军用电子信息技术,尤其是微电子技术、光电子技术和电真空技术等基础技术,并把空间技术、信息通信技术、微纳米技术等高新技术纳入优先研究和发展领域。法国经过多年的自主研发和大型技术计划的成功推进,已具有完整独立的军用电子信息技术研制能力以及开发设施,其雷达、通信以及先进探测技术均位居世界先进水平。文中主要介绍了法国军用电子信息技术发展的现状、发展趋势和发展特点。     

箔条和箔片的性能特性及其应用和趋势

从箔条和箔片用于干扰雷达测和扰乱、迷惑、转移或者引诱进攻出发,详细论述箔条、箔条云及箔片、箔片云的雷达散射截面、带度、平移速度、下降速度及转动等情况,空间和时间我、水平和垂直极化性能、多普勒频移效应以及频谱展宽特性等,通过箔条和箔片有效成火控雷达实例,提出对抗火控雷达的三个重要因素及其采取的对策。     

Towards Mobile Ubiquitous Service Environment

In this article we present a perspective on future vision of mobile communications and services which is referred to as Mobile Ubiquitous Service Environment (MUSE). Based on analysis of wireless communications and services, we exploit a conceptual model for MUSE via a top-down approach. The conceptual model consists of three major elements: Terminal Service Environment (TSE), Network Service Environment (NSE) and User Identity (UID). The concept of Always the Best Experience (ABE) is addressed as the hinge in design and development such that the user-centric services could be provided automatically and intelligently in the future diverse wireless world Based on these, we further discuss the issues on design and implementation of architecture of future wireless communication system. Requirements for architecture brought by the new features of MUSE are listed. Moreover, we also address several tradeoffs that should be taken into consideration in design. Finally, the deployment challenges for MUSE, such as reflectiveness of system, security and privacy, as well as peer-to-peer AAA are predicted.Ji Yang received PhD degree on Circuit and System, Bachelor degree on Telecommunication Engineering from Beijing University of Posts and Telecommunications (BUPT) in 2002 and 1993 respectively. Currently, he is an associate professor of BUPT, chief technical supervisor of Wireless Technology Innovation Institute, and vice manager of MTlab of Sino-Germany Software Institute. He leads the research on service and application in Future Forum in China. He also made much contribution to the China Communication Standardization Association (CCSA), including the vision of future Mobile Ubiquitous Service Environment, architecture of future B3G mobile terminal, etc. His research interests include architecture design for mobile ubiquitous networks, theory of self-organization, etc.Zhang Ping is now the professor of Beijing University of Posts and Telecommunications and director of Wireless Technology Innovation (WTI) Institute, BUPT. He has also served on the senior member of C3G Group, China MOST 863 future mobile communication FuTURE project, vice-chairman of China FuTURE Forum, and member of Vision Committee of World Wireless Research Forum(WWRF), he was vice chair of WWRF in 2005. He is also invited as the consultants for many domestic and oversea communication companies. He is very active on the international research activity on Beyond 3G area. He also participated in several European projects such as E2R and MOCCA. Until now, he has published 6 books, around 400 publications in journals and conferences in the area of telecommunications. His main research interests are theory and applications in wireless communication area. He was awarded by government, city of Beijing and Ministry of Information Industry several times for his great contribution to the industry and research activity in China.Hu Zheng is a PH.D candidate in mobile communications engineering in Wireless Technology Innovation Institute (WTI) at Beijing University of Posts and Telecommunications (BUPT). He received B.S degree from Nanjing University of Posts and Telecommunications in 2002, majoring in computer communications engineering. He currently works on serivce aspects of mobile ubiquitous communication system with focus on design and performance evaluation of interaction protocols and services in self-organized service environment.Wang Xu received the B.Tech. degree in electronic engineering from Beijing Polytechnic University (now named as Beijing University of Technology), Beijing, China, in 2002. Now he is working for his Ph.D. degree in Wireless Technology Innovation (WTI) Institute, Beijing University of Posts and Telecommunications (BUPT). His current interests include wireless communications in personal area, ad hoc networks and peer-to-peer system.Li Yinong received the BS degree major in Telecommunication Engineering in 1993 from Beijing University of Posts and Telecommunications, the MS degree and PhD degree major in Telecommunication and Electronic System in 1995 and 2003 from the Beijing University of Posts and Telecommunications. He is currently a lecture of STE (School of Telecommunication Engineering) of BUPT. His main research interests include service modeling, service composition approach, and intelligent service. In BUPT, he has given several lectures to both graduate and undergraduate students such as Information Theory, Speech Recognition, Pattern Recognition and Artificial Intelligence.     

单目图像序列光流三维重建技术研究综述

由单目图像序列光流重建物体或场景的三维运动与结构是计算机视觉、图像处理与模式识别等领域的重要研究内容,在机器人视觉、无人机导航、车辆辅助驾驶以及医学影像分析等方面具有重要的应用。本文首先从精度与鲁棒性等方面对单目图像序列光流计算及三维重建技术近年来取得的进展进行综述与分析。然后采用Middlebury测试图像序列对HS、LDOF、CLG-TV、SOF、AOFSCNN 和 Classic ＋NL 等典型光流算法以及 Adiv、RMROF、Sekkati 和DMDPOF等基于光流的间接与直接重建方法进行实验对比分析,指出各对比方法的优点与不足,归纳各类方法的性能特点与适用范围。最后对利用分数阶微分模型、非局部约束、立体视觉以及深度线索解决亮度突变、非刚性运动、运动遮挡与模糊情况下光流计算及重建模型的局限性与鲁棒性问题进行总结与展望。     

接入控制器安全网络管理系统的设计与实现

在讨论了接入控制器(AC)网络管理系统安全重要性的基础上,分析了SNMP协议的应用,包括对其3个版本SNMPv1、SNMPv2及SNMPv3的优缺点的对比,并解释了该设备网络管理系统采用SNMPv3版本的原因.详细介绍了AC所实现的管理信息库的内容,包括RFC1213协议、IEEE 802.1x协议、RMON协议、Web DHCP、EAP_OTP、EAP_MD5、EAP_TLS、EAP_SIM等多种认证协议以及网络管理系统的五大功能.最后阐述了AC安全网络管理系统结构的设计与实现.     

MATLAB在地理信息系统开发中的应用

GIS是计算机科学、地理学、测绘学、地图学等多门科学综合的技术,其核心是计算机科学,基本技术是数据库、地图可视化及空间分析。MATLAB是当前流行应用软件和编程语言,它集数学计算、可视化和编程于一体,易学易用。本文介绍了MATLAB软件的主要特点,阐述了MATLAB地图工具箱、数据库工具箱、用户图形界面及其与外部程序的接口等技术,并探讨了它们在地理信息系统开发中的应用。     

Cover Picture: Biomineralized Polysaccharide Capsules for Encapsulation,Organization, and Delivery of Human Cell Types and Growth Factors (Adv. Funct. Mater. 6/2005)

The cover shows biomineralized polysaccharide capsules with specifiable make‐up, which can provide microenvironments for stabilization, growth, and differentiation of human cell types, as reported by Oreffo and co‐workers on p. 917. The capsules are amenable to complexation with a range of bioactive molecules and cells, offering tremendous potential as multifunctional scaffolds and delivery vehicles in tissue regeneration of hard and soft tissues. The construction of biomimetic microenvironments with specific chemical and physical cues for the organization and modulation of a variety of cell populations is of key importance in tissue engineering. We show that a range of human cell types, including promyoblasts, chondrocytes, adipocytes, adenovirally transduced osteoprogenitors, immunoselected mesenchymal stem cells, and the osteogenic factor, rhBMP‐2 (BMP: bone morphogenic protein), can be successfully encapsulated within mineralized polysaccharide capsules without loss of function in vivo. By controlling the extent of mineralization within the alginate/chitosan shell membrane, degradation of the shell wall and release of cells or rhBMP‐2 into the surrounding medium can be regulated. In addition, we describe for the first time the ability to generate bead‐in‐bead capsules consisting of spatially separated cell populations and temporally separated biomolecule release, entrapped within alginate/chitosan shells of variable thickness, mineralization, and stability. Such materials offer significant potential as multifunctional scaffolds and delivery vehicles in tissue regeneration of hard and soft tissues.