宽带卫星通信系统的安全防护架构研究

针对宽带卫星通信系统安全防护的需求,提出了一种宽带卫星通信系统的安全防护总体架构,采用三级防护层级模式切换,通过对电磁环境感知、宽带动态频谱管理、综合分析与决策和资源分配辅助实现,保证系统可通性的同时,提升系统频谱利用效率和抗干扰防护能力.     

安卓终端系统安全机制研究与设计

移动终端作为用户使用移动信息化业务的载体和入口,成为企业移动信息化安全体系中关键的组成部分.针对终端系统的安全问题,本文对主流终端操作系统的关键技术和安全机制进行了深入研究,比较分析了几种主流系统安全方案,提出一种基于SE Android的双域系统安全技术方案.通过对该方案的系统安全架构、安全访问控制、应用隔离等关键技术和创新工作的详细介绍,说明了该解决方案的可行性和实用价值.     

军用卫星通信抗干扰技术研究

卫星通信是军事通信的重要组成部分,在现代电子战争环境下,卫星通信的环境又是十分恶劣的,它容易受到敌方的侦收、干扰和攻击等威胁。由抗干扰设计的基本思想出发,从空域、时域、频域等几个方面介绍了军用卫星通信常用的抗干扰技术措施及其发展趋势,阐明了在设计军用卫星通信系统时,应综合应用多种抗干扰措施,才能使卫星通信在空间恶劣电磁环境下更好地发挥作用。     

国外海军卫星通信的发展

本文主要分析介绍国外海军卫星通信技术的应用和发展。在概述基本情况的基础上，分别介绍了国外海军卫星通信的空间部分－通信卫星和舰载卫星通信终端；并阐述了国外舰船卫星通信的主要技术政策。     

卫星通信中量子安全协议的研究

随着信息安全需求的不断增长,卫星通信技术在量子安全通信中的应用备受关注。文中旨在深入探讨卫星通信中的量子安全协议,并强调了技术性和专业性。首先,介绍了量子通信的基础知识,包括量子通信概述和量子密钥分发协议。其次,概述了卫星通信技术及其应用,包括卫星通信系统的概览和卫星通信在安全通信中的应用。然后,详细讨论了卫星通信中的量子安全协议,包括BB84协议在卫星通信中的实现、E91协议及其卫星通信应用以及基于量子密钥分发的卫星通信方案。此外,对量子卫星通信的安全性进行了评估,并提出了卫星通信与地面站协同工作的优化策略。最后,总结了研究的主要发现,并指出了未来的研究方向。     

P4080平台安全启动实现设计

介绍了P4080安全启动信任链建立和传递的过程;利用P4080安全启动和可信结构,采用数字签名及验证技术设计了从ISBC到Uboot、从Uboot到Linux系统的两级信任链系统安全启动机制,并采用修改启动映像内容和替换内核映像的方法验证了安全启动机制的有效性。采用该设计设备平台在启动过程中可检查到启动程序、配置文件、操作系统等程序文件是否被篡改过,从而保障平台计算环境的安全。     

动态弹性安全防御技术及发展趋势

动态弹性安全防御(DRSD,Dynamic Resiliency for Security Defense)是国际上赛博安全领域新近出现的研究热点。动态弹性安全防御技术完全不同于以往的赛博安全研究思路,其通过多样的、不断变化的构建、评价和部署机制及策略来增加攻击者的攻击难度及代价,有效限制脆弱性暴露及被攻击的机会,增加系统弹性。充分利用时间、空间复杂性增强系统安全。文中对动态弹性安全防御技术进行了综述,首先介绍了动态弹性安全防御的研究现状,然后介绍了动态弹性安全防御的基本原理,并分别从网络配置随机化、网络服务组件多态化、软件多态化、拟态计算等方面介绍了当前具有代表性的动态弹性安全防御技术,最后讨论了动态弹性安全防御技术的优势和问题,对其应用前景进行了展望。     

支持IPv4/IPv6协议的安全Web托管服务机制的研究与实践

介绍了Web托管系统、系统安全和IPv4/IPv6过渡策略等相关内容,提出了一个支持IPv4/IPv6协议的安全Web托管服务机制,并对该服务机制的实际系统进行了性能测试.     

卫星通信的重要

随着科技和经济的发展,卫星通信的重要作用也逐渐被人们认识到。卫星通信不仅在普通通信传输中起作用,甚至影响着国防建设、生产安全和经济发展。因此,在进行经济发展和社会建设的同时,加强对卫星通信的认识和研究同样具有重要的意义。本文从卫星通信系统的基本构成出发,简要介绍了卫星通信系统的特点,并具体介绍了目前卫星通信应用情况,最后提出了对未来卫星通信系统的发展展望。旨在通过本文的简要阐述能够使卫星通信系统被更多人认识,被更广泛利用,也期望未来卫星通信技术的大发展。     

空间光通信用光探测器及其发展现状与趋势

空间光通信在军事通信、卫星通信、宽带接入和全球个人移动通信中具有举足轻重的地位，采用高频激光进行空间卫星通信已成为现代通信技术发展的新热点。本文介绍了几种用于空间光通信的光探测器的发展现状与趋势，并介绍了光探测器的典型应用。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks