结构保持的图像序列自适应超分辨率重建

基于概率运动估计的超分辨算法能克服传统超分辨率方法过分依赖于准确运动估计的缺点,为了改善其重建效果,通过分析图像的局部结构模式,给出了局部空域活跃度的定义表征图像的局部结构特征,设计了形状、尺度自适应的非局部空时邻域窗口函数,进而提出了一种结构保持的超分辨率自适应重建算法。实验结果显示,本文方法具有更好的重建性能。     

关联向量机及其在入侵检测中的应用探讨

介绍一种稀疏的贝叶斯学习算法——关联向量机(RVM)，它在再生核希尔伯特空间中学习，利用贝叶斯方法推理，推广能力好，与支持向量机相比不仅解更为稀疏而且不需要调整超参数。应用RVM的对小样本的良好分类能力，提出一种基于RVM的入侵检测原型系统。     

Nonstationary frequency effect of the ground motion upon the strength levels of the shear type RC structures

In order to investigate the influence of nonstationary frequency content variations, nonlinear response analysis for origin-oriented type hysteretic model is carried out and results are presented by applying two different S_I and S_II ensembles with varied frequency contents. The theoretical background of strong motion simulation is explained briefly depending on frequency parameters of stiff soil data. Based on models and applying Monte-Carlo's simulation mean values and standard deviations of displacement ductility demands for both ensembles are calculated. Required strength levels are investigated in probabilistic sense adopting light and heavy (but controlled) damage criteria. It is concluded that the nonlinear behaviour of the structure is greatly influenced by the nonstationary frequency content deviations as being shown that larger strength requirements for the S_I type strong ground motion ensemble than the S_II, although both ensembles have almost the same acceleration response spectra.     

Cultural climatology and the representation of sky, atmosphere, weather and climate in selected art works of Constable, Monet and Eliasson

The visual turn presents new challenges and methodologies for the pursuit of geography as we seek to communicate our ideas and understanding within and beyond the discipline. This paper attempts to show the potential importance of visual culture within a field that we may call cultural climatology. Cultural climatology seeks to explore the dialectic between society and atmosphere, weather and climate at a variety of temporal and spatial scales. A new visual approach to cultural climatology is presented as a possible way of stimulating conversations across the divide between the social and physical sciences. Images and visualisation assert their presence in the understanding, modelling and communication of many nature/culture debates, highlighting a need both for visual literacy across geography, and for social and physical scientists to share their visual methodologies. Cultural climatologists, like other scientists, need visual methodologies for both the critical construction and deconstruction of the images they wish to present and with which they are confronted. To illustrate the importance of visual literacy for cultural climatologists this paper introduces a sample of works from three artists: Constable, Monet and Eliasson. It shows how an exploration of their work (via a theory of pictures) could help to provide: firstly a methodology for understanding the cultural symbolism of skies and weather; secondly an assessment of the urban atmosphere in London at the turn of the 20th century and thirdly an example of the effective representation of atmosphere, weather and climate involving public participation and understanding. Lessons learned from deconstructing these works of art will then be used to suggest improvements in the visualisation of weather in the production and consumption of weather forecasts (thus, picturing theory).     

主题学习和稀疏表示的MODIS图像超分辨率重建

针对MODIS图像分辨率受传感器限制和噪声干扰,且分辨率局限在一定水平等问题,提出一种采用主题学习和稀疏表示的MODIS图像超分辨率重建方法,该方法通过双边滤波将MODIS图像的平滑及纹理部分分离,并将纹理部分看成是由若干"文档"组成的训练样本;运用概率潜在语义分析提取"文档"的潜在语义特征,从而确定"文档"所属的"主题"。在此基础上,针对每个主题所对应的图像块,采用改进的K-SVD方法训练若干适用于不同主题的高低分辨率字典对,从而可以运用这些字典对,通过稀疏编码实现测试图像相应主题块的超分辨率重建。实验结果表明,重建图像在视觉效果和PSNR等指标上均优于传统方法。     

钢筋混凝土柱极限变形角的概率特性及其在有控结构大震可靠度分析中的应用

通过对国外大量试验数据的整理和分析，统计给出了钢筋混凝土柱极限变形角的概率特性；在假设结构层间极限变形角近似等于柱子极限菜角的基础上，结合文献[1]的研究结果，初步建立了被动耗能减振结构大震可靠度的分析方法。     

A petroleum discovery-rate forecast revisited—The problem of field growth

A forecast of the future rates of discovery of crude oil and natural gas for the 123,027-km² Miocene/Pliocene trend in the Gulf of Mexico was made in 1980. This forecast was evaluated in 1988 by comparing two sets of data: (1) the actual versus the forecasted number of fields discovered, and (2) the actual versus the forecasted volumes of crude oil and natural gas discovered with the drilling of 1,820 wildcat wells along the trend between January 1, 1977, and December 31, 1985. The forecast specified that this level of drilling would result in the discovery of 217 fields containing 1.78 billion barrels of oil equivalent; however, 238 fields containing 3.57 billion barrels of oil equivalent were actually discovered. This underestimation is attributed to biases introduced by field growth and, to a lesser degree, the artificially low, pre-1970's price of natural gas that prevented many smaller gas fields from being brought into production at the time of their discovery; most of these fields contained less than 50 billion cubic feet of producible natural gas.     

云南地区未来强震的概率预测

本文将云南地区分为三个地震预报区,利用马尔科夫齐次模型,分别计算了其未来5年和10年时间内可能发生M≥6.0、M≥6.5和M≥7.0级地震的概率。     

乌鲁木齐市未来十年的震害预测及减灾对策

采用多因子综合概率法估计了乌鲁木齐市区及矿区的地震危险性。根据地震地质、地球物理场,地震活动性的研究,划分了潜在震源区,确定了震源区的地震活动性参数。应用以结构可靠度理论为基础的震损概率法,预测了乌鲁木齐的地震灾害。提出了减灾对策。