基于Docker云平台的管理系统构建及分析

主要对Docker云平台进行了研究.首先,从容器化、容器技术的发展历史、Docker依赖的技术和Docker的应用场景4个方面阐述了容器技术的基础知识;其次,从Docker的优势、Docker在云计算中的应用现状和Docker给云计算带来的变化等方面论述了云计算与Docker的关系:然后,在Ubuntu上部署了Docker的管理平台,即Shipyard,并在该平台上部署了手写服务;最后,为了验证该平台的可用性和Docker的高性能、低开销的特性,本设计还进行了3个测试实验,即物理机和Docker的性能对比、Docker数量对系统的性能影响和不同平台(物理机、Docker、KVM)的性能对比实验,测试结果和预期相吻合.     

数据库负载自适应技术的研究

数据库系统的负载自适应是一个性能管理过程,在这一过程中自主数据库系统自动地控制和过滤负载,并有效地使用数据库系统资源来满足网络应用的性能要求(SLA).文中将针对负载自适应技术开展研究.提出一个改进的数据库负载自适应体系结构框架WAAD(Workload Adaptation Architecture for DBMS),依据该框架初步搭建了一个测试平台QS(Query Scheduler)并做出了测试,测试结果表明该框架起到了提高网络应用性能的作用.     

云计算仿真工具分析与比较

云计算技术已经越来越得到人们的关注和接受。但是由于异构真实的云计算环境下的各种应用服务都有着不同的配置、部署条件和要求,所以如果要进行重复、可伸缩的试验来对不同应用模式进行量化、评价是非常困难的。因此,云计算环境的模拟仿真工具应运而生。在介绍目前比较流行的云计算仿真工具的基础上,对它们的架构、功能、性能进行了分析与比较。     

云环境下动态装配软件开发方法中的关键技术研究

云计算技术不断发展,在传统软件研发模式下,受制于服务器环境中致使研发与部署困难,软件系统可维护性及扩展性差,难以满足云环境中软件开发的需求,本文提出云环境下动态装配软件开发方法,在云计算环境中,软件开发人员通过云计算获取云组件IT资源,根据开发软件需求,在本地或云提供的虚拟机利用云组件进行组合装配完成程序设计,并通过中间数据引擎从云服务器动态加载与提取数据,形成一种基于云服务驱动、以B/S架构技术为架构模式的新型软件开发方法.     

软件定义安全模型与架构浅析

目前大多数企业已经部署了基于策略访问控制的信息安全防御体系,但是随着云计算环境部署和网络攻击技术的发展,安全正成为云计算环境下亟待解决的重要问题,诸如能轻而易举地绕过传统防火墙、突破基于黑/白名单与特征匹配的安全防御机制等高级持续性攻击,给传统安全体系带来了新的挑战.分析了传统紧耦合安全防御体系在虚实结合网络环境下面临的问题,提出了软件定义安全的模型及其框架下的关键技术,实现了虚拟的和物理的网络安全设备与它们的接入模式、部署位置解耦合,为企业云计算环境下自适应的主动安全防护提供了有益的探索.     

基于SaaS模式共享模型的一卡通扩展技术

为了弥补传统中心化系统中存在的技术短板,需要借助区块链与云计算技术来解决数据收集、存储与内容扩展的问题。以某智能一卡通管理系统为例,针对软件即服务(software as a service,SaaS)模式共享模型进行研究,提出了利用区块链和云计算技术来解决数据共享和安全性问题的方案。基于区块链和云计算技术的一卡通扩展技术,通过构建资源共享与云计算分布式架构,对设计方案进行了测试与性能分析,验证了其在实际应用中的有效性和可行性,对推动云计算时代下的信息化建设具有重要意义。     

浅谈云计算技术及其在智能油田的应用

本文主要介绍了云计算的概念和发展状况,并对云计算的部署模式、特征、关键技术和安全进行了综述,从而使读者对云计算技术有一个初步的了解和掌握.最后,探讨了云计算在智能油田中的作用.     

云计算虚拟环境的形式化安全验证

云计算是一种新兴的计算、存储资源使用模式,由于具备低成本、高效率等优点,得到了业界的广泛应用,但安全性仍然是云计算推广最大的障碍之一。虚拟化作为云计算的关键技术,其安全水平直接影响云环境的安全性,目前对云计算虚拟环境多采用传统的覆盖式验证方法,无法彻底解决正确性问题。文中通过结合形式化方法中的模型检测技术,经过配置采集、需求分析和性质检测3个阶段对虚拟化安全性质进行高覆盖率验证,提供了一种对云计算环境进行安全评估的可行思路。     

基于SFC的业务路径选择算法

产业界正在推进SFC(service function chain,业务链)技术发展,以实现云网融合的新型业务部署模式.业务路径选择策略是业务链的核心技术,直接影响网络性能与业务体验.针对现有业务路径选择策略存在的单一目标缺陷,创新提出并仿真验证了一种基于时延和负载的最小权重法,优化网络资源分配,提升业务链处理性能,为运营商未来网络和资源部署提供技术参考.     

迎接云计算带来的挑战

1 引言 云计算是IT行业中最热门的方法之一.尽管它在节约成本、提高效率和敏捷性方面具有巨大的潜力,但它也会带来一些新的挑战.诸如“跨越鸿沟”和“技术成熟度”等市场采纳模式已充分表明,云计算正在获得认同并且其应用进程也在不断加快.这些现象还表明,在部署云计算环境的过程中,越来越多的机构将会面临挑战,甚至可能遭遇失败.云...     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

中国建立EB级存储实验室,致力云计算应用(英文)

正With the support of 863 programs,Sugon Information Industry Co.,Ltd.,set up a dawning EB-class storage laboratory to address massive data storage requirements and largescale cloud computing demonstration applications.The Dawning EB-class cloud storage system adopts advanced fault-tolerant architecture,efficient data fault-tolerant algorithms with user authentication and data encryption policies to deal with the"lost""wrong"and"stolen"problems of data for ensuring the reliability and safety of the EB-class storage system in the public network application environments.The Dawning EB-class Storage Laboratory taking advan-