论装配式配电站的建设

装配式配电站的建设与发展,为电力行业的发展带来了全新的力量,极大地供应了整个社会的用电需求,提高了供电系统的运转水平,也为配电站建设节省了空间,削减了施工程序和周期,减少了环境污染,为整个社会创造了良好的经济效益和环境效益。本文分析了装配式配电站建设的方案、优势、技术以及效益。     

对VoWLAN技术的MAC研究与改进

提出了一种适合VoWLAN技术DEDCA接入机制,引入了信道状态CS因子,提出了基于信道状态的动态的退避窗口机制和一种新的退避方式.确立了退避窗户最大值和最小值的与信道关系的公式,确立了退避方式阀值的公式,最后通过进行了仿真,DEDCA不但对视频和音频有QoS保证,整个信道的性能都提高了,验证了DEDCA的正确性和适合在VoWLAN技术中的应用.     

基于XSLT和XML改进的Struts框架研究

介绍了Struts的框架模式以及流程,XML和XSLT的特点,分析了目前Struts的框架的优缺点,提出了新的改进方法,给出并分析了改进方法的流程图,还讲解了新方案的核心类的实现。重点讲解了如何用XSLT和XML改进Struts,最后阐述了改进后的优势。     

基于公平性的自相似业务接纳控制研究

文中研究了基于分形稳定运动有效带宽的计算方法,利用迭代过程推导出了聚合流有效带宽的计算公式,提出了一种基于有效带宽的公平性的自相似业务接纳控制算法,在接纳判断过程中引入了公平性机制,保证了业务接纳的公平性,通过MATLAB和OPNET相结合的仿真方法证明了该算法的有效性.结果证明了文中提出的算法保障了网络的服务质量,保证了各业务接纳的公平性,同时保持了网络高的利用率.     

恶性斗殴为何屡禁不止？——运营商互殴：粗暴宣泄何以为“道”!

“我有一个梦想：某一天三大运营商员工不摆摊了,不打架了,员工年收入差距缩小了,前端营业员待遇提高了,后端装维与资源矛盾化解了,服务质量提高了,恶性竞争消除了,重复建设停止了,不再破坏对手广告了,不互挖墙角搞策反了,不再零元购机了,不打价格战了,都能活的有尊严了”.     

基于ZEMAX的红外光学系统设计与优化

阐述了该光学系统研究的意义,确定了基本设计原则。然后进行了平行光管和望远镜的高斯光学结构模型及设计,建立了具体的数学模型并进行求解。最后根据目标耦合光路结构,利用ZEMAX软件对该光学系统进行了优化设计,对优化结果进行了像质评价,得出了结论。该系统解决了红外光学精确制导系统动态跟踪特性的内场测试的一系列问题,促进了红外黑体跟踪目标地面等效测试的发展,对提升仿真试验技术能力提供了重要的硬件支撑。     

智能卡ISO面沾污的解决

简介了GT(软封胶)封装的智能卡封装过程,给出了智能卡I SO面沾污的情况,通过分析设定了产生沾污问题的原因。然后用一系列实验的手段加以验证,找到了产生沾污的根本原因,最后提出了沾污评估的方法,得出了相应的解决方案,并对方案进行了讨论,得出了结论。     

一种基于TE技术实现Clark-Wilson模型的方法

分析了当前Clark-Wilson完整性模型实现机制的不足,提出了一种基于TE实现Clark-Wilson模型的方法.首先讨论了TE对Clark-Wilson模型的支持能力,然后给出了用TE实现Clark-Wilson模型的配置规则和约束.在实现中,扩展了模型的(userid,TP,list of CDIs)三元组,引入了角色层,以更实用的方式实现了职责隔离.同时,实现机制实现了对TP的保护,有效地保障了TP功能的正确性,提高了系统正确控制TP操作的可信度,减少了对Clark-Wilson模型验证规则的依赖.     

信息化扶贫工程试点工作初见成效运营模式仍需完善

2008年7月,国务院扶贫办启动了“信息化扶贫工程”试点,一年来,试点工作进展顺利,实现了预期的目的,试出了一些经验;取得了一些成效,受到了试点县干部群众尤其是贫困村农民的拥护和欢迎。     

二极管泵浦薄片激光器的最新进展

综述了国外不同类型薄片激光器的技术现状,分析了不同结构薄片激光器所具有的技术优势,技术限制和发展潜力,评述了薄片激光器所具有的诱人的应用前景,指出了遏制薄片激光器进一步发展的瓶颈,展望了薄片激光器未来的发展方向.     

High-resolution phase sampled interferometry using symmetricalnumber systems

This paper identifies a new phase sampling interferometer approach that can he easily incorporated into the established techniques to provide a high resolution, small-baseline array with a fewer number of phase sampling comparators. The approach is based on preprocessing the received signal using symmetrical number systems (SNS). Antennas based on both an optimum symmetrical number system (OSNS) and a robust symmetrical number system (RSNS) are investigated. The SNS preprocessing is used to decompose the spatial filtering operation into a number of parallel suboperations (moduli) that are of smaller computational complexity. A much higher direction finding (DF) spatial resolution is achieved after the N different moduli are used and the results of these low precision suboperations are recombined. By incorporating the OSNS or RSNS preprocessing concept, the field of view of a specific configuration of interferometers and phase sampling comparator arrangements can be analyzed exactly. The OSNS gives the maximum dynamic range or number of spatial resolution bins while the RSNS reduces considerably the number of possible encoding errors. Experimental results for both a 5-bit OSNS and a 6-bit RSNS array are compared. The errors in the encoding of the direction of arrival are quantified for both architectures     

Joint Multi-Target Identification and Classification in Cognitive Radar Sensor Networks

We investigate the problem of jointly classifying and identifying multiple targets in radar sensor networks where the maximum number of categories and the maximum number of targets in each category are obtained a priori based on statistical data. However, the actual number of targets in each category and the actual number of target categories being present at any given time are assumed unknown. It is assumed that a given target only belongs to one category and one identification number. The target signals are moreover modeled as zero-mean complex Gaussian processes. In this paper, we propose a joint multi-target identification and classification (JMIC) algorithm for radar surveillance using the cognitive radar network. The existing target categories are first classified and then the targets in each category are accordingly identified. Simulation results are presented to evaluate the feasibility and effectiveness of the proposed JMIC algorithm in a query surveillance region.     

A study on energy optimized 4 dot 2 electron two dimensional quantum dot cellular automata logical reversible flip-flops

In the present scope, new design methodologies for reversible flip flops are proposed and the results are analyzed by the QCADesigner tool. To the best of our knowledge such methodologies are reported for the first time in the literature. In this paper, we provide few formalisms also. The first one is for the system energy derived using Hamiltonian paradigm and provides internal energy of cell electrons. The second formalism provides the minimum energy requirement for execution of a QCA architecture. This procedure reduces wastage of clock energy. Two very interesting parameters are identified playing crucial role in this context: (i) The electron quantum number n which indicates quantum energy level and (ii) intermediate quantum number for an electron lying between 1 and (n−1). It is established that the incident energy frequency is directly proportional to the number of cells and quadratic function of electron quantum number and intermediate quantum number. The dissipated energy frequency is also directly proportional to the product of number of cells and quadratic function of electron quantum number. This paper, reports some remarkable results. The relaxation time is observed being inversely proportional to the product of number of cells in the architecture and quadratic function of quantum number as well as intermediate quantum number. Apart from these, differential frequency is found directly proportional to the number of cells in the architecture and quadratic function of intermediate quantum number. Few major observations are also indicated: (i) There is always a probability of reflection even if the system energy exceeds barrier energy. (ii) On the contrary, there is always a probability of transmission even though system energy is dominated by the barrier energy.     

第二类计算机构想

根据集合论中康托定理等,定位几何曲线被定义为第二类数———f数,并建立了相应的第二类数域F0,它们是对实数、实数域的一种本质性扩充。以第二类数为基本运算单元的计算机,是第二类计算机。人类的视觉等,是第二类计算的一些实际例子。     

一类ARIA型扩散结构分支数的研究

分支数达到最大的二元矩阵被广泛应用到分组密码扩散层的设计中.本文针对ARIA算法的扩散层,首先给出了ARIA型扩散结构的定义,给出了16阶ARIA型扩散结构的分支数情况,进一步给出了分支数为8的16阶ARIA型扩散结构的充要条件,从而构造了一大批可供选择的分支数为8的16阶二元矩阵.其次,解决了16阶ARIA型扩散结构分支数为8的计数问题,最后,给出了分支数为8的16阶对合ARIA型扩散结构的构造方法.本文的研究成果为构造分支数达到最大的16阶对合二元方阵提供了一种新方法.     

关于实数的可计算性

给出了图灵机和可计算数之间的关系和可计算数的若干性质，提出了半可计算数的概念，并在此基础上结合集合的算术层次对实数集进行了算术分层，这一思想对于从可计算性角度理解实数具有借鉴意义。     

Learning automata routeing in connection-oriented networks

Learning automata are used at the source nodes of a connection-oriented network to dynamically route newly arriving virtual calls to their destination. First, two new learning automata are introduced. Then, these two learning automata, as well as the well-known L Learning automaton and the deterministic shortest-path algorithms are used in a simulation program to route virtual calls. The more frequent the updating and the more recent network state information used, the better the performance. In the sequence, the virtual link length is developed as a function of both the number of packets and the number of virtual calls at the network link. This virtual link length is used in the learning automata routeing algorithm and is shown via simulation to be superior to the minimum packet delay or shortest-queue-type link length, usually used in real networks. Thus, in connection-oriented networks, not only the packet but also the virtual call traffic characteristics should be used in the routeing decisions. Furthermore, when the network state information is out-of-date, or when there are few virtual calls and each one carries a large number of packets, then the virtual link length should be based more on the number of virtual calls than on the number of packets at this link. On the other hand, when the network state information is current and there are many virtual calls and each one carries a small number of packets, then the virtual link length should be based more on the number of packets than on the number of virtual calls at this link.     

The radiation properties of electrically small folded spherical helix antennas

The radiation properties of several electrically small, folded spherical helix antennas are presented. The primary variables considered in the design of these antennas are the number of helical turns and the number of helical arms. The principle design objectives are to achieve self resonance, a low quality factor (Q), and a practical radiation resistance for small values of ka. Designs are presented for ka less than 0.5, where the antennas are self resonant, exhibiting an efficiency in excess of 95%, a Q within 1.5 times the fundamental limit, and a radiation resistance near 50 /spl Omega/. The relationship between the number of helical turns, the number of helical arms, and achieving self resonance at low frequencies is discussed.     

参量阵扬声器系统的超声发射阵指向性研究

在参量阵扬声器系统中,需采用若干个压电陶瓷超声换能器单元组成换能器发射阵,换能器单元的数目和排列位置会对发射阵的指向性产生影响。通过改变换能器数目及之间的相对距离,模拟了超声发射阵的空间指向性。与实测结果进行了比较,验证了在设计超声发射阵列时,此模拟方法的可靠性和实用性。     

电磁波在不均匀尘埃等离子体中的衰减特性

基于WKB近似方法, 研究了高频电磁波入射不均匀尘埃等离子体中的衰减特性.对弱电离尘埃等离子体复相对介电常数的分布特征进行了分析, 讨论了电子数密度、尘埃颗粒数密度对复相对介电常数虚部的影响.利用电子密度分布的抛物模型, 数值计算了电磁波以不同角度入射不均匀尘埃等离子体的衰减特性, 对入射角、电子数密度、尘埃颗粒半径和尘埃颗粒数密度对衰减系数的影响进行了分析.结果表明:随着电子数密度、尘埃颗粒数密度和半径增大, 衰减系数也会变大.