基于SDN的DCI网络场景研究

IDC是目前互联网流量的重要发源地之一,很可能成为未来电信承载网的核心环节,随着移动互联网和云计算的兴起,云IDC的出现带来了承载网络的一系列新挑战。基于SDN理念的DCI互联场景可以满足新的业务需求,提供一个可扩展、高灵活的新型智能化网络解决方案,保障IDC网络的持续发展。     

我国IDC市场监管进展及分析

随着近几年互联网及移动互联网市场的快速发展,IDC市场需求极度膨胀,于2012年底IDC/ISP市场准入停滞多年后重新启动,市场出现了新的情况和新的变化。我国政府相关部门希望从事前、事中、事后三个环节加强作IDC和ISP的管理,确保互联网相关业务发展安全可控。目前,通过增加技术评测,事前监管关工作已经有效开展,服务能力及水平不断提升,良好效果。     

Low-power survivor memory architecture for DFSE in 1000BASE-T transceiver

A novel approach to survivor memory unit of Decision Feedback Sequence Estimator （DFSE） for 1000BASE-T transceiver based on hybrid architecture of the classical register-exchange and trace-back methods is proposed. The proposed architecture is investigated with special emphasis on low power and small decoder latency, in which a dedicated register-exchange module is designed to provide tentative survivor syml~ols with zero latency, and a high-speed trace back logic is presented to meet tile tight latency budget specified for 1000BASE-T transceiver. Furthermore, clock-gating register banks are constructed for power saving. VLSI implementation reveals that, the proposed architecture provides about 40% savings in power consumption compared to the traditional register-exchange architecture.     

对IDC测评体系的探讨

随着互联网技术和服务的高速发展,对数据中心的各方面要求不断提高。国外已有多种成熟的评估体系来对数据中心进行评测与分级,但我国尚无这方面的体系。建立完整的标准体系,研究完备的评测方法,形成完善的评估体系,对我国IDC行业的良性发展将会起到至关重要的作用。     

Direct quantification of mono- and di-D-α-tocopherol polyethylene glycol 1000 succinate by high performance liquid chromatography

A simple and direct reversed-phase high performance liquid chromatography (RP-HPLC) method with UV detection was developed and validated for the determination of mono- and di-D-α-tocopherol polyethylene glycol 1000 succinate (TPGS 1000) in TPGS mixture. Before the HPLC analysis, mono- and di-TPGS 1000 were separated by simulated moving bed (SMB) chromatography system and characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The mass spectrometric results confirmed that the molar mass distribution of TPGS prepared in our laboratory was very close to that of the product of Eastman Chemical Company with similar nˉ (average polymerization degree), M(n)ˉ (number-average molecular weight) and M(w)ˉ (weight-average molecular weight). The HPLC analysis was carried out on a C30 analytical column with mobile phases comprised of acetonitrile (A) and isopropanol (B) in gradient conditions. Validation of the analytical method was done on the following parameters: system suitability, linearity, limits of detection and quantification, accuracy and precision, method robustness and solution stability. The linearity of the calibration curves for mono- and di-TPGS 1000 from both sources was found to be good (r(2)>0.9996). The recovery values were from 94.6% to 103.3% for mono-TPGS, and 93.5% to 103.3% for di-TPGS. This method could be successfully used in the direct quantification of mono- and di-TPGS in TPGS 1000 mixture using TPGS standards with similar molecular mass distributions although derived from different sources.     

大型IDC机房的多专业协同及设计案例

首先介绍了大型IDC机房的建设趋势,并提出多专业协同设计是大型IDC机房成功建设的前提条件;然后详细地分析了土建、装修、电气照明、弱电监控、消防、空调、电源、工艺等8个专业在大型IDC机房建设中的设计要点;最后提出了大型IDC机房的多专业协同措施,并以案例来具体说明大型IDC机房的多专业协同设计流程和设计结果。     

某飞机APU进/排气门控制盒可靠性研究

对某飞机APU进/排气门控制盒的可靠性进行了分析,综合考虑器件、环境、电路设计等可靠性因素,依据国军标GJB/Z299C-2006《电子设备可靠性预计手册》中提供的方法,通过元器件可靠性预计法对控制盒的可靠性进行预计,并根据一般原理对提高控制盒可靠性的方法进行了探讨。对比及验证表明,控制盒设计合理,可靠性满足主机及系统要求。     

冷热电三联供在数据中心的应用

文中针对现阶段数据中心规划、建设中电力供应的难题,结合数据中心自身建设和运营的特点,提出了三联供系统在数据中心的多种应用模式。三联供系统的应用,大幅提高了数据中心的能源综合利用率,具有显著的经济和社会效益。通过对三联供系统关键设备及运行参数的分析比较,优化了运行模式,对今后三联供系统在数据中心的工程应用提供了指导。     

软件形式化开发方法的选择策略研究

随着软件形式化方法的不断发展,各种各具特色的形式化方法涌现出来,为了解决在具体的系统开发中如何选取合适的形式化方法,对目前较为流行的几种形式化方法RSL,B,VDM,Z的特点进行对比分析,然后针对不同的软件开发人员和所需开发系统的不同,给出了适合用形式化方法开发的情况和如何选择合适的形式化开发方法。     

基于AMBE-1000与nRF401的无线语音传输系统的实现

介绍了Digital Voice System. Inc公司的AMBE-1000芯片与挪威Nordic 公司的nRF401芯片的特点与工作原理,给出了一种基于AMBE-1000和nRF401的无线语音传输系统的实现.系统采用AMBE-1000 结合TCM320AC36C进行语音信号的处理;同时,采用nRF401传输数字化后的语音信号;在整体上,采用AT89C52 处理器负责接口之间的数据处理.提出了系统的硬件设计、软件流程.此系统具有无需许可证、功耗低、使用方便等特点,可广泛应用于无线语音传输系统的产品设计中.