NSST域三维块匹配的SAR图像相干斑抑制算法

为了降低合成孔径雷达(synthetic aperture radar,SAR)图像中相干斑噪声对后续应用的影响,提出一种基于非下采样剪切波变换(non-subsampled Shearlet transform,NSST)域三维块匹配的相干斑抑制算法。该方法能够充分利用图像的自相似性和稀疏性,在抑制相干斑的同时保留图像的细节。为了较少计算量并增强相似块匹配的鲁棒性,使用灰度理论(grey theory,GT)进行相似性度量得到相似块组; 为了获得更多方向的细节信息,将相似块组变换到NSST域实现多尺度多方向的分解并对系数进行收缩滤除相干斑噪声; 将NSST系数反变换并利用相似性作为权重得到相干斑抑制后的SAR图像。通过在真实SAR图像上进行测试实验,进一步验证了相似块匹配方法及相干斑抑制算法的有效性,有利于SAR图像的后续应用。     

基于边缘响应和自相似的红外与可见光图像区域特征匹配方法

红外与可见光图像的匹配是计算机视觉中一项重要的研究课题.由于红外与可见光光谱的差异,图像之间的相似性较低,图像匹配正确率较低.根据红外与可见光图像区域形状相似特点,提出了一种基于边缘响应和自相似区域特征匹配方法.该方法首先计算红外与可见光图像的边缘响应并检测区域特征,然后提取区域形状并建立区域形状的自相似描述,最后对区域特征进行匹配.实验结果表明,该方法在特征检测可重复率和特征匹配准确率等方面均具有良好的性能.     

基于物元理论的工序相似性识别方法

利用相似工序法构造大量数据样本,针对工序相似性判别问题,提出基于物元理论的相似性识别方法.建立工序相似判别的物元模型,确定经典域和节域,通过计算关联函数值,确定权系数,计算隶属度和隶属判断等步骤,从质量特征相同或相似的多个工序中识别出与期望工序最相近的一组,实现工序相似性识别.结合实际生产进行实例分析,结果表明:与传统的分类方法相比,该方法易于编写程序,减少了人为因素的影响,使评判结果更加合理.     

图像的局部自相似性用于边缘检测的方法研究

定义了一种局部图像自相似性测度，根据图像在边缘点处具有较好的局部自相似性这一特点，提出了基于局部图像自相似的边缘检测方法，实验结果表明，这种方法可以有效地提取图像边缘，并且具有较好的抗噪性能。     

一种基于二进制语义特征向量的协同过滤方法

提出了一种图像检索新方法,通过用高层语义描述图像,用二进制特征向量判断语义特征是否存在,由向量计算若干图像相似的可能性(即概率),再根据概率值判断图像的相似度值.通过收集每一次检索时用户的反馈信息,采用协同过滤技术挖掘以往用户的反馈信息,同时给数据库中每幅图像分配一个领域,若检索中图像代码相同则提高它们的相似度.通过比较查全率和查准率,证明该方法优于传统的基于内容的图像检索方法.     

网络流量自相似性在DDoS攻击检测中的应用

大量研究表明网络的正常流量具有自相似性,可以用自相似性参数Hurst系数来描述。DDoS攻击会破坏或者影响网络正常业务的自相似特性,用优化的R／S作为自相似性参数Hurst系数的估算算法,分析DDoS攻击数据流对正常业务数据流自相似参数Hurst系数的影响,来检测DDoS攻击。     

基于相似性迁移学习的图像标注

提出一种基于相似性迁移学习的图像标注算法.首先建立图像间的特征相似度量,引入相似性迁移学习算法,将图像的底层特征相似度量迁移到图像所对应标注词的相似度量,通过统计方法实现图像的自动标注.实验表明,本文方法能够有效提高图像的标注质量,减少噪声干扰.     

基于互信息与梯度相似性相结合的医学图像配准方法

针对传统互信息配准方法未利用图像空间信息的缺点,提出一种将互信息与梯度相似性结合的医学图像配准方法.待配准图像的每组对应点的梯度相似性包括方向相似性和模值相似性.待配准图像整体梯度相似性系数由各对应点对的梯度相似性之和决定,该系数与传统互信息的乘积作为图像配准的测度.利用2D多模图像分别进行平移、旋转、采样,得到配准函数曲线,并给出具体的配准实例.实验结果表明,该方法比传统互信息有更高的鲁棒性和精度.     

利用图像特征点及自相似性的鲁棒数字水印方案

利用图像潜在的自相似性并结合特征点提出了一个新的数字水印方案.首先提取图像最高3位位平面的重心确定特征三角形;然后,根据水印比特位的不同确定不同的寻找范围,对特征三角形寻找与其最相似的块,最后用最佳相似块来替换特征三角形,从而完成水印嵌入.在检测时用同样的方法提取特征三角形,并对特征三角形在整个图像范围内进行最佳相似块的寻找,根据相似块所在的区域来提取水印.实验表明,该方案对RST(旋转、放缩以及平移)、剪切等几何攻击具有很高的鲁棒性,对压缩、滤波和加噪声等常见的图像处理也取得了很好的效果.     

基于稀疏表达的图像自动标注

本文提出稀疏表达的图像标注算法.通过提取图像的SIFT特征及HSV特征,建立稀疏模型,采用距离函数对图像的特征向量进行相似度量求出稀疏系数,实现特征向量的匹配,考虑到图像内容的相似性会体现到标注词上,因此对待测图像进行自动化标注.实验表明,该方法充分运用了图像数据的稀疏化以及从已知信息到待标记图像的映射,完成图像的自动标注,提高了图像特征提取的质量,简化图像处理所用的实验数据,降低计算时间复杂度.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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