过抽样混沌序列的语音通信加密应用

通过对混沌系统特性的研究,设计出一种安全性高、加密速度快的通信加密方案.首先根据数字混沌序列的特性对混沌的迭代过程进行改进,实现对Chebyshev混沌序列的过抽样处理.设计语音信号传输系统,在发送端实现混沌序列对语音信号的加密,调制后进入高斯白噪声信道,在接收端接收到密文后对加密语音信号进行解调和解密,得到解密后的语音信号.实验证明,过抽样技术应用在混沌扩频通信中,可以极大地提高无线通信的保密性.     

基于CNN和DES的图像保密通信系统设计方案

为了解决混沌加密系统密钥空间设计上的不足以及数据加密标准(DES)加密算法易被攻击的问题,将细胞神经网络与DES加密算法相结合,提出一种混合加密通信方案.该方案利用细胞神经网络产生混沌信号,将其经过取整、取模、平方、开方、增益、偏移等运算处理后,用得到的新的混沌伪随机序列将图像加密,然后利用DES算法进行再加密.文中还讨论了系统的实现方法.仿真结果表明,采用此混合加密方案进行加解密均可取得较好的效果,解密结果对细胞神经网络初值和DES密钥高度敏感,安全性能有所提高.     

基于AES加密算法的语音加密通信的实现

该文简述了AES(Advanced Encryption Standard)加密算法的原理.提出了针对语音信号进行加密通信的方案.测试实现了基于FPGA的语音通信的加解密过程,有效的提高了语音通信的安全性,同时改善了对语青信号的加解密速度.     

基于混沌序列的数字图像加密

目的 为了保证数字图像的安全性和可靠性,提出混沌序列对称加密算法对数字图像进行加密.方法 设计了基于Logistic映射模型的混沌序列对称加密算法,实现对数字图像的混沌加密及解密.结果 加密实例表明加密图像已经完全掩盖了原图的内容,原图的灰度分布也得到了掩盖.结论 基于Logistic映射的混沌加密是一种安全、有效、快速的加密方法.     

基于混沌离散序列的图像加密算法研究

针对传统加密算法密钥空间小、加密结构简单等不足,提出了一种能极大扩充加密密钥的双重图像加密算法.在发送端,通过连续混沌系统产生图像位置映射矩阵对图像像素位置进行置乱,再通过将图像像素值信息加入离散混沌系统进行扰乱.加密的图像通过以太网进行传输,并在接收端进行像素值同步解密和位置复原.该方法同时利用混沌系统的初值敏感性和混沌系统的同步性对图像进行双重加密.构造的双重混沌图像加密系统结构复杂不易破解且具有极大的密钥空间.实验表明,基于Liu混沌系统与离散混沌同步系统的双重图像加密能够抵挡图像统计攻击与无穷举攻击,并能够在Windows系统上进行实现.     

一种基于新的快速混沌加密算法及其在信息安全中的应用

提出了一种高速且易于在软件上实现的混沌加密算法．利用混沌系统的类随机性和遍历性,该算法产生了在固定子区间的混沌伪随机序列,同时动态改变变量值来对明文进行加密,实现了对多种类型文件信息的快速加密和解密．通过对该算法的效率和安全性进行分析,表明本密码系统有良好的安全性和较快的加密速度．     

数字对讲机语音加密方法及实现

提出一种数字对讲机实时语音加密方案.首先,利用线性同余发生器和复合混沌系统设计加密系统.利用Chebyshev映射和Cubic映射构造动态变参数复合混沌系统,并用线性同余发生器为复合混沌系统提供初值.然后,基于STM 32硬件平台设计数字对讲机语音加密系统,加密算法中所有步骤都在STM 32平台上实现.经测试表明:该加密系统具有较高的安全性和较好的实时性.     

超混沌迭代同步在数字语音保密通讯中的应用

提出超混沌迭代系统的主动－被动（ＡＰＤ）同步方法,研究了它对语音的加、解密性能,证明此系统可以应用于数字语音保密通讯,并建立了计算机模拟超混沌迭代系统同步的数字语音加密解密系统,实现了混沌语音保密通讯．此方法具有同步速度快,恢复语音精度高,难于破译的特点     

结合DNA编码的快速混沌图像加密算法

针对现有图像加密算法的加密、解密速度问题,提出了一种与DNA编码相结合的快速图像加密算法,采用新4维混沌系统产生的混沌序列作为索引序列,指明置乱过程中要交换的具体位置.对置乱后的图像进行DNA编码,采用规则1的DNA加法法则和DNA异或法则完成扩散过程后,再用不同的规则进行DNA解码,从而完成二次加密.实验结果表明:本文提出的方法在保证图像加密系统安全的同时,减少了置乱过程中循环遍历的次数,从而提升了加密和解密的速度.     

一种基于混沌经济模型的图像加密算法

混沌经济系统具有混乱性等复杂的动态特性,这些特性可以应用于密码学.提出了一种基于混沌经济模型的图像加密算法.实验结果表明,该算法可以正确地加密解密数字图像.分析表明算法对密钥变化敏感,密文图像像素灰度值具有分布随机性和低相关性,同时提高了加密速度.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.