供给侧改革视阈下高职计算机类专业建设与产业发展的适配研究——以湖南省为例

从企业数量、固定资产投资、主营业务收入等方面调研湖南省新IT产业发展,量化分析产业用人需求与学历层次结构;从专业的点数、学生、师资等维度剖析该省高职计算机类专业建设与人才供给。基于“协同学”理论构建高职计算机类专业系统与新IT产业系统的适配模型并进行修正补偿,合理测度二个系统的适配性与发展态势,从人才培养供给侧入手,提出专业结构优化、培养规格强化的高职计算机类专业建设思路。

边云协同计算中基于预测的资源部署与任务调度优化

数据集中处理的云计算模式提供交互迅速、绿色高效的多样化应用服务面临新挑战.将云计算能力扩展到边缘设备,提出了边云协同计算框架;设计了基于任务预测的资源部署算法,在云服务中心通过二维时间序列对任务进行预测,结合分类聚合、延迟阈值判定等优化边缘服务器任务运行所需资源部署;提出了基于帕累托优化的任务调度算法,在边缘服务器分2个阶段进行帕累托渐进比较得到用户服务质量和系统服务效应2个目标曲线的相切点或任一相交点以优化任务调度.实验结果表明:结合基于任务预测的资源部署算法与基于帕累托优化的任务调度算法在提高平均用户任务命中率基础上,其用户平均服务完成时间、系统整体服务效应度、总任务延迟率在不同用户任务规模、不同Zipf分布参数α的应用场景下,均优于基于帕累托优化的任务调度算法和基于FIFO(first input first output)的基准任务调度算法.

基于利益相关视角的多维QoS云资源调度方法

基于云用户和云服务提供商的利益相关视角,以低计算成本(如能耗、经济成本和系统可用性等)满足云用户高QoS需求(如任务执行时间和任务最终完成时间),设计多维QoS云计算体系结构,构建多维QoS云资源调度模型,面向二级云资源调度,提出采用多重Greedy算法思想的MQoS云资源调度算法。实验结果表明,在具有无后效性的4种云计算应用场景下,MQoS云资源调度算法相比FIFO云资源调度算法、m^2EC多维能耗虚拟机调度算法,其多维QoS度总体提升206.42%~228.99%、34.26%~56.93%,其云数据中心负载均衡差平均总体降低0.48~0.49、0.20~0.27。

珠三角城际轨道交通简支箱梁优化设计研究

我国城际铁路建设中桥梁比例高,并以常用跨度标准梁桥为主,其技术经济性对城际铁路建设影响较大。为进一步提升城际铁路常用跨度桥梁技术经济性,本课题总结高速铁路、城际铁路建设经验,结合珠三角城际铁路特点,通过桥面布置优化研究,提出便于检修、维护的桥面布置型式;通过研究不同线间距时桥面板受力性能,提出适用于线间距不断变化的简支箱梁截面形式,为珠三角城际轨道交通桥梁标准化制造和管理提供条件。通过采用高强度预应力钢绞线、大吨位锚具,优化腹板厚度,分析腹板厚度采用360 mm和330 mm后的受力性能、材料用量和施工便易性,确定优化结构尺寸的腹板厚度采用360 mm。优化后的32 m箱梁每孔可降低原材料成本3.9万元,100孔双线梁桥综合造价降低2.2%~4.5%。

Decadal co-variability of the summer surface air temperature and soil moisture in China under global warming

The self-calibrating Palmer Drought Severity Index (PDSI) is calculated using newly updated ground observations of monthly surface air temperature (SAT) and precipitation in China. The co-variabilities of PDSI and SAT are examined for summer for the period 1961-2004. The results show that there exist decadal climate co-variabilities and strong nonlinear interactions between SAT and soil moisture in many regions of China. Some of the co-variabilities can be linked to global warming. In summer,sig-nificant decadal co-variabilities from cool-wet to warm-dry conditions are found in the east region of Northwest China,North China,and Northeast China. An important finding is that in the west region of Northwest China and Southeast China,pronounced decadal co-variabilities take place from warm-dry to cool-wet conditions. Because significant warming was observed over most areas of the global land surface during the past 20-30 years,the shift to cool-wet conditions is a unique phenomenon which may deserve much scientific attention. The nonlinear interactions between SAT and soil moisture may partly account for the observed decadal co-variabilities. It is shown that anomalies of SAT will greatly affect the climatic co-variabilities,and changes of SAT may bring notable influence on the PDSI in China. These results provide observational evidence for increasing risks of decadal drought and wet-ness as anthropogenic global warming progresses.