基于支持向量数据描述和不确定性推理的单类隐写分析算法

单类隐写分析较传统的二类隐写分析有更好的"盲"检测特性和更强的通用性。针对单类隐写分析可靠性较低的问题,将不确定性推理理论应用于隐写分析中降低不确定性因素对单类隐写分析可靠性的影响,提出了一种基于支持数据描述和不确定性推理的单类通用隐写分析算法。实验表明,算法具有较好的可靠性、鲁棒性、通用性。     

LSB隐写术的密钥恢复方法

作为隐写术安全性分析的重要手段,隐写分析已成为信息隐藏领域的一个研究热点.而通过恢复隐写密钥来提取隐藏的消息是隐写分析的主要目的之一.为了研究如何搜索隐写密钥,首先在"已知载体"和"载体被重复使用"条件下,分析了恢复LSB隐写术密钥的计算复杂度.然后在"载体被重复使用"条件下,对图像空域LSB隐写术提出了一种新的密钥恢复算法.该算法借鉴了密码分析中的"分别征服攻击"思想,使计算复杂度由O(2 (2r))降至O(2 r).实验结果表明了该算法的有效性.     

高阶隐写直觉模糊集距离安全性测度

在隐写安全性研究滞后于隐写算法发展的前提下，隐写安全性研究成为亟待解决的问题。根据隐写通信过程的模糊不确定性，对隐写数据采用n阶Markov链建模，提出了隐写系统直觉模糊集距离安全性测度，并证明了该安全性测度的有界性、交换性和一致性。仿真实验表明，该安全性测度具有对不同隐写算法的度量区分能力。与确定模式下安全性相比较，在相同数据统计模型下，直觉模糊集距离安全性测度获得了更全面的隐蔽性评价。     

FMS故障诊断专家系统推理算法的研究和实现

采用反向符号推理和正向数字推理相结合的方法 ;研究适合于故障诊断专家系统的模糊推理算法 ,同时应用神经网络算法 ,解决多种有效的推理问题。提出了一种故障诊断模糊综合推理算法 ,开发了FMS故障诊断专家系统。理论分析及应用表明 :该算法在故障诊断领域具有通用性和高效性特点。     

基于双重随机过程的追踪追溯不确定性情境推理算法

提出了基于双重随机过程模型的对象追踪追溯不确定性情境推理算法。改迚的算法涵盖了对对象当前位置的计算、将来位置的计算以及最佳位置序列的计算等。同时双重随机过程模型描述的内容更加全面,包括对象在某一位置驻留时间为固定长度的情况,以及对象在各位置驻留时间服从不同的概率分布情况。实验结果表明,相对于隐马尔可夫模型的情境推理斱法,本文构建的基于双重随机过程模型的情境推理斱法具有更高的推理准确性,更适合于实际应用中的不确定性情境推理。     

隐写分析算法的量化评估方案

根据隐写分析算法的特点和应用需求，结合ROC分析，提出了一个隐写分析算法的量化评估方案，包含4个评估指标，涉及算法的可靠性和准确性、适用性、分类代价和计算复杂度，并研究算法达到有效检测时，对应载密对象的最小嵌入率，分析了影响计算复杂度的因素，提出了样本量分析，并针对实际应用对虚警率和漏报率的不同需求，提出了分类代价分析，量化评估结果对于改进和应用算法具有参考意义，根据结果可以对算法的优劣进行多方面的比较，从而确定出最优的算法。     

基于LSSVM的JPEG图像隐写分析算法

构造了一种基于最小二乘支持向量机的针对JPEG图像的隐写分析方法，在DCT域和空间域上提取了JPEG图像的18维特征向量，利用LSSVM构建分类器，并根据嵌入算法的种类设定分类器的输出，以达到检测秘密信息的存在性和判别使用何种隐写算法实施信息嵌入的目的，针对Jsteg，F5，MB三类最常用的JPEG图像隐写算法进行了二分类和四分类的实验，结果表明，构建二分类器进行载密图像检测时，正确率较高；构建多分类器检测载密图像、判断其使用的隐写算法时，对于高嵌入量的载密图像有着较高的判断正确率。     

故障诊断专家系统中的模糊推理算法

目的　研究故障诊断专家系统的模糊推理算法。方法　将正常推理和臆测推理中多种情况分开处理,采用反向符号推理和正向数字推理相结合的方法,并利用模糊理论设计证据输入接口。结果　提出了一种故障诊断模糊综合推理算法,开发了FMS故障诊断专家系统。结论　理论分析及应用表明,该算法在故障诊断领域具有通用性和高效性。     

一种基于浅层卷积神经网络的隐写分析方法

为提高隐写分析的检测准确率,提出了一种基于浅层卷积神经网络的图像隐写分析方法。与深度卷积神经网络相比,浅层卷积神经网络通过减少卷积层和禁用池化层,来加快神经网络收敛速度和减少隐写特征丢失,同时采用增加卷积核数、使用批正则化以及使用单层全连接层的方式,提高隐写分析网络的泛化性能。实验结果表明,针对S-UNIWARD隐写算法,在嵌入率为0.4 bpp和0.1 bpp时,检测准确率分别能达到96%和81.7%,同时在载体库源及嵌入率失配情况下,该方法仍能保持较好的检测性能。     

基于SVM的通用隐写检测算法设计与实现

通用隐写检测是隐写分析技术研究的重点。针对加性噪声隐写模型,以BMP图像为研究对象,进行通用隐写检测算法研究与设计,在此基础上,给出了算法设计与实现的流程和其性能的有效性验证。实验结果表明该算法具有较好的检测精度、较低的虚惊率和漏警率。     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that