手机广告模式与计费方式探讨

随着手机的普及和移动互联网的发展,手机具备了巨大的广告价值潜力。我国的手机广告产业发展处于初期阶段,手机平台巨大的广告潜力尚未得到充分认识和合理利用。本文将以手机广告市场的宏观现状、趋势和广告行情为基础,对中国手机广告产业的商业模式和计费方式进行探讨。     

构建鄱阳湖生态经济区低碳农业发展的路径思考

在全球气候变暖的条件下,发展低碳农业已成为不可逆转的趋势。鄱阳湖生态经济区内农业碳资源比较丰富,且极具开发潜力,因此,低碳农业发展空间巨大。鄱阳湖生态经济区内各地政府要立足当地资源优势,充分挖掘当地农业碳资源,通过发展有机农业和循环农业,加大植树造林力度,加强湿地保护,促使农业由高碳向低碳有效转变。     

以“卓越工程师”为导向的通信专业具有创新精神的人才培养模式研究与实践

本文系统地介绍了通信专业以“卓越工程师”为导向的具有创新精神的人才培养模式的人才培养目标的制定、课程体系的构建、创新型教学团队、渐进式创新意识和创新能力培养等内容,以期培养更多优秀的工程技术人才。     

经验模态分解效果与信号频率振幅的关系

利用经验模态分解(Empirical Mode Decomposition,简称EMD)方法对由两个正弦线性叠加而成的信号进行分离处理,研究正弦信号的频率和振幅对EMD分离效果的影响.通过多组实验得出,两正弦信号的频率相差越大或振幅相差越小,EMD分离效果越明显.     

产学模式在《数据库原理》课程教学改革中的应用

针对目前《数据库原理》课程采用传统教学模式存在的诸多问题,就如何提高应用型本科计算机专业学生对《数据库原理》课程的学习兴趣和解决实际问题的能力,提出了产学相结合的数据库原理课程教学模式,首先让学生在工程化环境中进行相关理论学习,同时提供课程网站等辅助手段进行扩展学习,在此基础上根据企业的实际需求模拟环境让学生进行实践,并对其实践展开了进一步讨论。     

基于FPGA的AVS编码器帧内预测实现

针对帧内预测的快速算法,由于DSP架构软件顺序执行的局限性难以满足实时性要求,而FPGA以其高速的计算速度和强大的并行处理能力成为H.264和AVS编解码的理想平台。本文在FPGA平台上采用资源共享、高并行和多流水线结构实现了亮度帧内预测算法。该方法在分析AVS帧内亮度5种预测模式的基础上,将像素预测与模式判决在一个模块中完成,并且利用各模式预测的相似性,实现运算单元共享和多种模式并行执行,兼顾了处理速度和实现代价。仿真及综合结果表明该设计能够完全满足标清(704×576,30f/s)数字视频的实时处理要求。     

BEMD在复杂背景下弱小目标检测中的应用

针对复杂背景下的弱小目标检测与识别问题,提出了一种基于二维经验模态分解(Bidimensional Empirical Mode Decomposition,BEMD)的检测算法。待检测的原图像经过BEMD分解筛选出多个二维的内蕴模函数(Intrinsic Mode Functions,IMF)和趋势图像,使用全局门限法分割各个IMF,将处理后的IMFs综合成一个分割出待检测目标的结果图像。实验结果表明,该方法使用简洁的步骤,有效、准确地检测出弱小目标。     

Numerical evaluation of the effects of friction and geometric nonlinearities on the energy release rate in three- and four-point bend end-notched flexure tests

Nonlinear finite element analyses are used to examine the effects of friction and geometric nonlinearities on the energy release rate in three- and four-point bend end-notched flexure tests. Energy release rates are first determined by a recently developed direct energy balance approach. It is shown that the finite diameter loading rollers that are typically used in practical test set-ups cause both tests to be inherently nonlinear. The effect of these nonlinearities on the energy release rate is shown to be larger in the four point than the three point test and to increase with increasing roller diameter, increasing coefficient of friction along the crack plane, and decreasing supporting span length. For the four point test, the effect of these nonlinearities is also shown to increase with increasing ratio of inner to outer span length. Next, energy release rates at the onset of crack advance are determined by a simulated compliance calibration technique. This “perceived toughness” is compared with predictions of the “true toughness” given by the direct energy balance approach at the same load. It is shown that perceived toughnesses from this simulated compliance calibration procedure are larger than previously reported results that were obtained in a similar fashion using linear theory. In addition, the perceived toughness is shown to strongly depend upon the range used for fitting the load versus deflection data to obtain compliance. These findings are used to make some general recommendations regarding use of the two test methods and their associated data reduction techniques.     

一种用于无线ATM网络的呼叫允许控制方案

无线异步传输模式(ATM)网络通信系统将在宽带和多媒体个人通信得到广泛应用.提出一种用于无线ATM网络多媒体通信服务的呼叫允许控制(CAC)方案,它采用统计大量用户移动信息来估计未来业务需求和系统可用资源,并根据用户移动信息动态地调整用于潜在切换呼叫的资源预约,能有效利用无线频谱资源,增大系统容量.     

Fracture Resistance of a Cracked Concrete Beam Post-strengthened with FRP Sheets

Fibre-reinforced plastic (FRP) composites have been increasingly used in rehabilitation and strengthening of concrete structures. Significant increases in stiffness and strength have been achieved by applying this technique. However, there is concern about the ductility or toughness performance of FRP/concrete hybrid structures, which is critical in the application of this technology. This paper presents a new theoretical method to predict the fracture resistance behaviour of FRP post-strengthened concrete flexural beams. No slip between the FRP and plain concrete matrix is assumed and Mode I fracture propagation is considered. The model is valid for a wide range of span-to-depth ratios and any crack length. The influence of the bridging stresses provided by the fracture process zone (FPZ) at the tip of a fictitious fracture is examined. The effect of various material and geometric parameters on the resistance curve and toughness of the hybrid structure is discussed, based on the numerical results from the developed theoretical formulae. The results provide a useful insight into the strengthening/toughening and the design of FRP sheet/concrete beam structures.