基于载体信息值比较的信息隐藏方法

目的 给出一种新的空间域类的信息隐藏方法。方法 将待隐藏的机密信息数据转化为二进制数，将载体信息数据依次分为数据对，调整每对数据的坐标位置，使二大小的逻辑关系对应于机密信息数据的二进制的位，从而实现对机密信息的隐藏。结果 给出了在图像中隐藏汉字档和在声音中隐藏图像的实验，并对隐藏性能作了分析和比较。结论 该算法原理简明，编程容易，信息嵌入与提取速度快。与其他空域类算法相比，鲁棒性有较大地提高。     

XML中的信息隐藏

XML作为Internet上的信息交换格式,XML(Extensible Markup Language,可扩展标记语言)一出现, 使得到广泛的应用和支持,它将掀起新一轮数据处理和网络应用开发的革命.XML不是一种普通的文本语言,它用于置标电子文档,是一种使其数据具有结构化的置标语言.利用XML的这一特性,可以将秘密的信息隐藏到XML文本中. 这种方法主要是基于XML不是一种普通的文本文件,而是一种结构化的丈本.通过改变XML的标示字体的物理特性, 或变换DTD声明及其应用能量中的原始XML文档的逻辑结构,将信息隐藏到XML的原始文档中.     

一种分组的信息隐藏算法

将加密信息与载体图像转换成二进制序列,把加密信息每3个位分为一组,每组的加密信息与待嵌入图像低位的信息进行比较后,修改载体图像,嵌入加密信息;提取加密信息时,找出嵌入的位置,读取标志位,根据标志位取反与否读取隐藏信息.新算法在信息嵌入量不变的情况下,修改嵌入信息位少,载体图像变化小,安全性高.新算法实现简单,嵌入信息量大,隐藏效果好,具有一定的实用价值.     

一种基于余数嵌入的隐写算法

针对最低有效位嵌入数值的方法存在的缺点,设计一种新的数值嵌入方法——基于余数的嵌入法.该嵌入法根据余数映射表将载体数值的余数修改为某一区域内的随机值,同时修改载体数值的商,使得载体值在嵌入信息前后接近.映射表可自由设计,使得嵌入更加灵活和安全.与此同时,鉴于现有隐写算法多在离散余弦变换域隐藏信息、隐藏区域缺乏可变性的缺点,构造出在小波域内使用余数嵌入法的隐写算法.实验证明,当余数映射表的长度不太大时,该隐写算法具有很好的隐蔽性和安全性.     

一种基于汉字结构的文本信息隐藏方法

信息隐藏技术是信息安全领域的一个研究热点，它利用载体信息的冗余特性，将 秘密信息嵌入到载体中以实现信息的秘密传输.分析了汉字的基本特征，提出了一种基于汉字结构类型和笔画,通过改变汉字的字体来实现信息隐藏的方法，经实验证明该方法具有较好的安全性.     

一种基于位平面的差值扩展可逆水印算法

为了提高算法的嵌入容量和降低失真率等问题,文章提出一种基于图像位平面图分解理论的差值扩展算法,该算法只针对图像较低层的位平面图进行信息嵌入,不改变图像的其他较高位平面的像素值,通过这样的操作,在减小图像失真的同时,提高了总的信息隐藏量.     

基于二次剩余的视频信息隐藏算法

针对不重要位信息隐藏算法鲁棒性弱的问题,提出基于二次剩余的视频信息隐藏算法。算法通过对像素点低有效位组合的二次剩余或二次非剩余性质的判断,根据嵌入信息流为1或0,对原视频流进行相应操作,从而实现信息嵌入的功能。通过对视频的嵌入操作证明,该算法极大增加了隐写容量,增强了信息隐藏的鲁棒性。     

一种基于DCT域系数的信息隐藏算法

提出了一种盲信息隐藏算法，通过调整DCT系数．将秘密信息嵌入在数字图像中．该算法具有较大的数据隐藏能力，在秘密信息的提取过程中不需要原始图像的参与．计算机实验结果表明，所隐藏的秘密信息可以被有效地恢复．     

基于多进制嵌入的彩色图像可逆数据隐藏算法

针对Tian差值扩展算法存在过分修改像素值、嵌入容量不高等缺点,提出了一种基于多进制嵌入的彩色图像可逆数据隐藏算法.它利用十字预测法获取较高的直方图峰值,将版权信息变换成二进制和三进制信息,然后分两次嵌入到多个峰值中;同时在嵌入之前有针对性地对所有可能溢出的像素进行调整,并将这部分信息作为辅助信息优先存放,替代了定位图.嵌入的顺序与分形生长图形计算的结果一致,提高了保密性.实验结果表明:该算法在保证图像质量的同时,嵌入的容量有一定的提高.     

一种DCT域的灰度级数字水印算法研究

针对灰度级数字水印图像中,常因信息量大而影响嵌入质量与稳定性的缺陷,提出了一种新的嵌入灰度水印信息的算法。该算法先把灰度水印信息转换成二进制矩阵,再按每两位结合转化成含0、1、2、3的矩阵,然后用两个不相关的伪随机序列分别代表0、1和2、3,随后形成两个伪随机矩阵。嵌入过程中,按分块方差升序的方法嵌入到中频系数中。实验证明,这种算法具有很好的抗剪切、噪音、滤波与JPEG压缩失真的能力。     

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.     

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。     

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.     

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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