云计算环境下分布存储的关键技术

云计算(cloud computing)作为一种新型的计算模式,在商业计算领域和科学计算领域中均发挥着重要的作用。云计算环境下的分布存储研究数据主要集中在数据中心的组织方面和管理方面,研究数据作为云计算环境的核心基础设施,通常情况下由100万级以上的节点组成,存储上的数据规模达到FB/EB级,最终使得数据失效成为一种比较常见的状态,在很大程度上限制了云计算的推广和应用等,增加了云计算的成本。基于此,降低成本以及提高扩展性等成为了云计算环境下分布存储研究的关键技术。笔者将根据相关工作经验。综合分析云计算环境下分布存储数据的关键技术,以期能够给相关工作者提供可参考的意见。     

分布式存储关键技术应用

云计算是随着网络的发展而产生的,如果没有将云计算工作做好,那么对整个的工作也会产生着影响,云计算环境便于网络资源的传递和存储,尤其是云存储技术的应用,为各行各业的发展奠定了基础,在各行各业的发展中是离不开云计算的,要重视云存储技术在云计算中的应用.本文就是对云计算环境下的分布存储关键技术进行分析,为相关的研究提供借鉴.     

基于云计算环境下的分布存储关键技术研究

文章主要以云计算下分布存储关键技术的产生作为出发点,分析了分布存储技术结构和相关问题,并探讨了云计算环境下的分布存储关键技术,以期为提高云计算下数据分析和处理能力提供一些参考和意见。     

基于云计算环境下的分布存储关键技术

随着数字信息技术的逐渐研发,云计算技术应运而生,云存储环境对于计算机系统中的数据信息处理、数据信息存储等带来巨大的帮助.作为云计算环境下的关键技术之一的分布存储技术,以其服务器运行的高效性、交换机核心运转的准确性,为云计算环境下数据存储提供技术支持.基于此,在本文中对云计算环境下的分布存储关键技术进行研究.     

云计算环境下的分布存储关键技术

伴随着我国科学技术的日益进步,各个领域的工作中都会出现云计算的身影,可以说明云计算技术已经充分渗透到各行各业,在各个领域中发挥着巨大的作用.云计算技术作为其中一个重要的技术应用已经在各种领域发挥着巨大的作用,也是当前互联网信息技术发展的一个主要方向.云计算技术对于数据处理以及数据存储有着充分的安全保障,如果将云计算技术充分运用于分布存储中,可以更加充分发挥分布存储的工作效率,据此,本文主要阐述了云计算环境下的分布存储的结构,并对其关键性的技术进行详细的分析.     

云计算中的数据安全存储和加密模型的设计

云计算是当下最新兴的计算机网络技术和研究方向之一,云计算以服务的形式为网络用户提供大量的IT资源。云计算模式下,大量的数据和应用被用户以云计算服务为依托托管起来,但云计算本身具有的透明性特点,使数据的管理出现失控现象。数据的安全存储问题也就成为了云计算发展迫切需要解决的问题。文章就将介绍云计算中数据安全存储和加密模型的设计。     

基于云计算的海量数据存储模型

针对目前网络产生的数据越来越多以及随之而来的海量数据的存储问题,在云计算技术上,依据Hadoop及虚拟化技术,提出了基于云计算的海量数据存储模型。将医院信息化的海量数据部署在Hadoop平台上,根据云计算的核心算法MapReduce来处理数据,最后将数据存储在虚拟资源池中。通过实际的应用,该模型可以很好地克服现行的存储方式存在的不足,解决海量数据在存储当中存在的问题,并且能够很好地提高存储的效率。     

国外云计算标准化组织介绍

作为一种将计算和存储任务分配到由大量计算机构成的云端的计算范式,云计算必将会引起IT行业的一场巨大变革.本文给出了研究云计算的国外标准化组织,并对ISO/IEC、IEEE、ITU-T云计算焦点组、分布式管理任务组、云安全联盟、美国国家标准技术研究所、网络存储工业协会在云计算方面的标准化成果进行了详细的介绍.     

云计算与大数据环境下全方位多角度信息安全技术研究与实践

近年来,云计算研究成为各大领域的关注热点,很多企业及业内人士逐步将云计算作为计算机网络技术应用架构的核心,云计算服务所提供的庞大网络数据中心不仅存储着大部分的应用软件和数据信息,还掌握着应用程序的管理及信息数据的安全维护工作,在为用户提供查询便利的同时,也可消除诸多安全隐患.本文主要对云计算和大数据环境下的信息安全技术及其实践进行研究、分析,仅供参考.     

面向开放式实验室的云计算教育功能组建

目前的开放实验室存在着教学资源分布不均、教学资源共享程度低、教学资源孤岛现象严重、缺乏相互协作等问题,云计算可以将分散的资源集中存储和管理。云计算是传统计算机和网络技术发展融合的产物,如今云计算发展突飞猛进,云计算可以促使开放实验室教与学趣味化,也可以促使实验室的制度化。     

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.     

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.     

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.     

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.     

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