云数据中心基于异构工作负载的负载均衡调度方案

针对目前云数据中心的负载均衡调度方案没有研究将不同工作负载的应用程序进行整合的问题,提出了基于异构工作负载的静态和动态负载均衡调度算法。当放置新的虚拟机的时候,通过静态负载均衡调度算法,将虚拟机分配给物理机。云数据中心运行过程中,采用动态负载均衡调度算法将负载高的物理机上的虚拟机迁移到负载低的物理机上。仿真实验结果表明,新的调度方案不仅能够降低云数据中心的不均衡率,而且使节点内的多维度资源得到了合理地利用。     

面向移动云计算的自适应服务选择方法研究

Despite the rapid advances in mobile tech-nology, many constraints still prevent mobile de-vices from running resource-demanding applica-tions in mobile environments. Cloud computing with flexibility, stability and scalability enables ac-cess to unlimited resources for mobile devices, so more studies have focused on cloud computing- based mobile services. Due to the stability of wire-less networks, changes of Quality of Service (QoS) level and user' real-time preferences, it is becoming challenging to determine how to adaptively choose the “appropriate”service in mobile cloud compu-ting environments. In this paper, we present an a-daptive service selection method. This method first extracts user preferences from a service's evaluation and calculates the similarity of the service with the weighted Euclidean distance. Then, they are com-bined with user context data and the most suitable service is recommended to the user. In addition, we apply the fuzzy cognitive maps-based model to the adaptive policy, which improves the efficiency and performance of the algorithm. Finally, the experi-ment and simulation demonstrate that our approach is effective.     

改进型ICA和SVM相结合的火山灰云遥感检测

针对独立分量分析(ICA)模型在火山灰云遥感检测中的不足,提出了一种改进型ICA即变分贝叶斯ICA (VBICA)和支持向量机(SVM)相结合的火山灰云遥感检测算法,实现了火山灰云信息的近似分离.实验结果表明,所提算法能够从中分辨率成像光谱仪(MODIS)遥感图像中检测出火山灰云目标信息,且总检测精度和Kappa系数分别达到了88.4％和0.801 1,取得了较好的检测效果.     

600MW褐煤锅炉机组水冷壁鼓包原因分析

内蒙古国华呼伦贝尔发电有限公司600 MW褐煤锅炉机组采用墙式切圆燃烧方式。自机组投产后,在历次停机检查中均发现水冷壁鼓包现象。分析认为锅炉水冷壁管表面状态不良、管壁传热差及介质流量不足是造成水冷壁鼓包的主要原因。在此基础上提出严格控制锅炉水冷壁温度、加强炉外水处理等预防和改进措施,避免再次发生水冷壁鼓包问题。     

Colloid Transport through Natural Filter Media

In this project the use of natural media filtration (NMF) was evaluated for its ability to remove colloidal particles from the aqueous phase as a function of ionic strength and filter media type by determining first-order kinetic deposition rate coefficients. Mushroom compost (MC) and leaf compost (LC) were tested as natural filter media and the results were compared to those obtained using sand and granular activated carbon (GAC). The highest deposition rate coefficients were observed for GAC, followed by LC and MC, and the lowest deposition rate coefficients were found for sand. As predicted by the Derjaguin–Landau–Verwey–Overbeek theory, higher deposition rates were obtained at higher solution ionic strengths. Overall the experiments suggest that the NMF process can efficiently remove colloidal particles from surface waters.     

Three-dimensional analysis of boreholes considering spatial variability of properties and poroelastoplasticity

In general, analysis of oil producing wells is carried out considering that both hydraulic and mechanical parameters of the rock mass are deterministic. Mechanical and hydraulic properties of rock masses and in particular sedimentary rock masses may show a considerable degree of spatial variability. This paper focuses on the evaluation of the three-dimensional borehole response, particularly of the plastic zone, taking into account the spatial variability of both hydraulic and mechanical properties. The analysis is performed with a developed finite element program that incorporates spatial variability, coupled fluid-mechanical effects and elastoplastic behavior of the rock mass. Examples are shown and conclusions are drawn regarding the effect of spatial variability on the three-dimensional borehole analysis.     

Influence of High-Permeability Layers for Enhancing Landfill Gas Capture and Reducing Fugitive Methane Emissions from Landfills

Gas collection systems of various designs have been used to control landfill gas emissions, which can be problematic, particularly before installation of final landfill covers. In this work, an innovative gas collection system that includes a permeable layer near the top surface of landfills was evaluated for enhancing capture of landfill gas and reducing fugitive methane emissions. A computational model that accounts for advective and diffusive fluxes of multiple gas components was used to evaluate the efficiency of this new design for intermediate landfill covers. The utility of the high-permeability gas-conductive layer was illustrated for several conditions of interest including varying refuse permeability, varying degrees of permeability anisotropy, and temporal atmospheric pressure changes. Simulations showed that the permeable layer decreased methane emissions by 43% when the horizontal to vertical permeability ratio for refuse was kh/kv = 3 and the domain average kh = 3×10?12?m2, while reductions in methane emissions decreased to 17% for the same anisotropy but with kh = 10?11?m2. With this design, barometric pressure changes did not significantly affect oxygen intrusion or methane emission rates.     

广告媒体策划的数学模型及其解法

讨论了文选媒体策划最适解法模型的构成，求解过程和实例测算。     

纸质媒体生存危机探析

在综合分析国内外报纸的生存现状调查资料的基础上,提出传统纸质媒体所面临的生存危机：受众的大量流失是其市场生存的最大危机,广告收入的下降及发行成本的上升促使其采取减少发行量和报纸涨价的无奈选择,由此可能进入受众流失——广告收入下降——减少发行量——报纸涨价——更多的受众流失的恶性循环。此外互联网、手机等新媒体的迅猛发展将加速传统纸质媒体的衰微。     

建构中国新闻史主体性话语的方法论思考

以戈公振的《中国报学史》和李龙牧的《中国新闻事业史稿》为代表的这两种研究范式都是一种历史叙述的＂普世话语＂,放弃了＂中国＂新闻史的独特性,因此,建构中国新闻史主体性话语应树立中国问题意识,从媒介生存这个角度来探求这种话语的出场路径,立足于新闻自由,在与其他地域媒介生存经验的对比参照中参与全球对话。