校园网FTP服务器性能评价与改进策略

FTP是校园网络中极为重要的业务系统,但目前大多数的FTP服务器普遍存在性能上的瓶颈,造成资源利用率低的现象。因此从高校校园网的实际需求出发,分析了现有FTP应用软件的工作原理,重点对服务器的节点个数和节点的处理速率进行深入研究。然后基于多线程原理,建立了FTP服务器的排队理论模型。通过对网络带宽利用率、服务器响应时间及节点处理速率等指标的计算分析,提出了相应的FTP服务改进方案。     

论高校电视、网络传播一体化

高校电视和网络传播一体化是高校现代技术信息开发、利用的重要课题。文章针对高校校园电视与网络传播一体化整合、校园电视视频传播网络化实现的可能和电视传媒和网络传媒的整合具有独特的优势进行了阐述,讨论了当前电视和网络传播一体化发展的制约因素,并就高校电视、网络传播一体化对我们工作的新要求提出了看法。     

校园网络视频组播系统技术浅析

近年来,校园视频服务成为校园数字化建设中必不可少的组成部分,广泛应用于校内网络教学、网络直播和视频会议等。本文结合学校实际,并结合高校校园网的特点,探讨在校园网内部建设视频点播系统的技术方法,以便能充分发挥利用校园网的资源。     

视频监控在高校安保工作中的作用及优化技术研究

视频监控系统是高校校园安全保卫工作的重要组成部分,发挥了重要作用。首先分析了高校校园视频监控系统存在的管理上的问题以及技术上的难题,然后主要针对监控系统技术上的难题提出了优化方案,即对现有监控系统进行架构优化,并详细分析了各种优化技术。     

高校网络安全现存问题及解决对策

校园网作为高校进行信息化建设的一项重要基础设施,其存在的作用不仅仅是改革了高校教学手段和教育思想,同时还共享了校园内的资源,加强了资源在校园内外的交流和沟通。也就是说,校园网在方便学生校园生活以及促进教学改革、提高校园管理效率等方面起着重要的作用;但不可忽略的是高校网络的安全问题。本文在对目前高校网络现存的安全问题进行分析的基础之上,还提出了相应的解决策略,磁暴保证校园网络得以安全有序的运行。     

高校新媒体网络系统的构建

本文基于校园网络环境,介绍了如何将各类媒体资源,通过成熟的网络系统实现同步、共享和统一管理。重点分析了传统电视媒体与网络媒体的融合技术要点。借助视频编码、组播、光端机等技术,搭建媒体资源平台,实现媒体资源的数字化转换和统一播出形式。同时,结合校园网特点,对媒体资源平台进行优化配置。构建的媒体网络系统对高校快速部署校园网络电视台或媒体发布平台起到示范作用。     

基于云移动技术的应急视频指挥系统

应急视频指挥系统是应急指挥的重要支撑系统,传统应急视频指挥系统以视频集成为主,各个系统之间没有数据交换和共享.介绍了现有的应急视频指挥系统,提出结合现有的应急视频系统,利用“云网络”和移动互联技术,通过多种网络互联、多种支撑系统、多种终端应用,设计并建设一个以信息资源快速、实时、不间断共享为目的,覆盖全省范围内的智能应急视频指挥平台.介绍了应急视频平台的组成模块、逻辑架构以及各种应用功能.     

无线多媒体传感器网络视频编码研究

在资源受限的无线多媒体传感器网络中存在大量的视频数据需要处理和传输.为充分地利用这些有限的资源,需要设计一个能够综合考虑能量消耗和压缩率、图像质量之间平衡的视频编码方案.对无线多媒体传感器网络中视频编码技术的发展现状、面临的挑战和设计目标进行了讨论.对无线多媒体传感器网络视频编码现有的解决方案和理论研究成果进行探讨,分...     

运用WLAN+LMDS+GPRS构建城域校园网络

近年来高校的合并和招生规模不断扩大,带来了部分师生无法接入现有校园网络的问题,如新分校区的用户不能接入本校区校园网等问题.本文提出了一种运用现代无线通信技术对现有校园网络进行扩充并建立城域校园网络的方案,分别利用WLAN覆盖校内热点地区、LMDS连接主分校区和通过GPRS在校外接入校园网,实现了城域校园网的无缝覆盖,可为高校大规模校园网建设提供一定的参考.     

一种网络视频行业应用解决方案

近几年对网络视频行业应用解决方案的研究主要集中在视频监控行业和酒店行业,只解决了行业应用中的一部分模式类型,还有更多的行业需求没有被满足.结合IPTV与高校视频应用合作的案例,提出一种开放化的IPTV架构,满足自有内容与版权内容混合服务行业应用模式,不仅为高校师生提供有版权的优质视频内容,还可为高校自身丰富的视频资源,包括活动、讲座、校园电视台等内容,提供发布的渠道和服务的平台.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.