Opportunistic spectrum sharing in software defined wireless network

Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualization is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is proposed.Simulations demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.     

FORECASTING ：EXCHANGE RATES： AN OPTIMAL APPROACH

This paper looks at forecasting daily exchange rates for the United Kingdom, European Union, and China. Here, the authors evaluate the forecasting performance of neural networks （NN）, vector singular spectrum analysis （VSSA）, and recurrent singular spectrum analysis （RSSA） for fore casting exchange rates in these countries. The authors find statistically significant evidence based on the RMSE, that both VSSA and RSSA models outperform NN at forecasting the highly unpredictable exchange rates for China. However, the authors find no evidence to suggest any difference between the forecasting accuracy of the three models for UK and EU exchange rates.     

Ptfv_1临床意义的探讨

Ptfv1值在判断心功能状态时具有参考价值 ,故密切注意患者的心电图Ptfv1的动态变化具有较重要的临床意义     

单机E/T调度问题的动态规划新解法

本文利用最优调度的目标函数的性质，放弃了参数为整数的假定，改进了求解单机的Ｅ／Ｔ调度问题的动态规划算法，使其在时间复杂度和空间复杂度两方面都有提高     

Generalized Reactive Manufacturing System

Generalized reactive manufacturing system named GRMS is introduced. GRMS is a human-centered system based on Multi-agent. Its management and control organization is made up of three types of agents named device agent, task agent and shop-floor agent. GRMS adopts a top-down and bottom-up competition and cooperation strategy based on the dynamic sifter and funnel . To constrain the behavior of agents, a reward and penalty policy is introduced into the system and the closed-loop adjustment of GRMS is realized through such policy. Agents for the same task should be cooperated with each other and agents for different tasks should compete for survival in the dynamic changing environment. A distributed-hierarchical architecture with three levels of master-slave relationships among agents are proposed. Self-propelled process planning is also discussed. In order to evaluate GRMS, a time-driven simulation system-GRMOSS is developed to check the physical consistency of GRMS.     

国内外煤炭自然发火预测预报技术综述

就近几十年来，国内外在煤炭自然发火预测预报方面的一些主要成果进行介绍，对各成果的优缺点进行分析，并指出进一步研究煤炭自然发火预测预报技术，对煤矿的安全生产具有十分重要的意义。     

动态多媒体网页的制作及研究

利用现代技术，通过网页与数据库系统的连接，同时采用多媒体技术与网页技术相结合，创建新颖别致的动态网站，同时，开发了DHTML方式的课件制作技术及课件制作工具，特别是通过采取图像的可替代方式和重复使用等措施，解决了网页的多媒体视觉效果和下载速度这一矛盾。     

技巧混合双人组第三套联合套路的设想

纵向分析了国际技巧规则,阐明了在技巧运动规则不断变化中,我国混合双人组所受到的影响,从而提出混双组在运用新规则中如何把握、进行"难、新、稳、美"指导训练,创造好的成绩以及创新第三套的专项特色,为此提出了相关的看法与建议。     

沥青路面夹层动态粘弹性及抗剪性能(英文)

为提高半刚性沥青路面与沥青加铺层的防反射裂缝的能力,在基面层之间设置了柔性夹层.采用动态剪切流变仪(DSR)对纯沥青夹层、不同土工织物夹层进行了动态扫描,并分析了其动粘弹性,然后对夹层的抗剪性能进行试验分析.研究结果表明,土工织物夹层满足路面抗滑移的要求,具有良好的路用性能.     

基于SIMULINK异步电动机SPWM控制的动态仿真

根据状态方程,利用SIMULINK软件构建了异步电动机的动态结构及坐标变换结构,采用自然采样方法仿真调制电路,构成SPWM调速系统.通过加载,变载及变压变频直接观测电动机的转速、磁链、定子电流的动态变化及电动机的机械特性.系统模拟真实系统,对理论教学起到有效的辅助作用.