传感器观测相关条件下的最优分布式检测融合算法

针对分布式串行检测融合系统的检测性能优化问题,研究了一种各部传感器判决规则联合优化的系统性能优化方法.融合系统由N部传感器构成,系统性能优化准则采用Bayes准则.在各部传感器观测相关的条件下,为了使系统检测性能达到最优,推导出了传感器判决规则联合最优化的必要条件,得出了最优传感器判决规则满足的一组系统方程,并根据系统方程组设计了求解各部传感器最优判决规则的数值迭代算法.仿真结果表明,采用该数值迭代算法联合优化各部传感器的判决规则,可使融合系统的Bayes风险显著低于单部传感器.     

LDPC码位翻转解码算法研究

研究了低密度奇偶校验(LDPC)码的位翻转硬判决迭代解码算法,引入接收信号作为可靠性评估,从而推导出LDPC码位翻转软判决解码算法．在软判决算法的实施过程中,提出“分类投票排队”方法,使LDPC码位翻转解码算法在复杂度略有增加但仍低于置信传播算法的情况下,性能得到改善。     

改进DM-SVDD算法的异常检测研究及应用

针对传统异常检测模型在数据不平衡情况下对少数异常类样本识别效果较差的问题,提出了一种基于改进扩散映射的支持向量数据描述算法(DM-SVDD),构建新的模型并将其应用于工业异常检测。通过引入欧氏距离和马氏距离两种距离度量公式,构造新的近邻图改进扩散映射算法,结合支持向量数据描述算法进行建模,新模型不仅提高了对多数正常类样本的识别性能,且对少数异常类样本的检测性能也优于传统模型。实验数据选取多晶硅铸锭生产过程中的配料数据,研究结果表明:对于异常类样本较少所形成的不平衡数据,与传统的异常检测模型相比,所提出的改进模型可使G-Mean最优提升15.73%,F-Score最优提升19.37%,满足工业异常检测的需求,可用于指导实际生产过程,降低生产成本。     

关于半收敛问题的探讨

针对实际CT系统中的不完全数据图像重建算法半收敛问题,分析了迭代外插算法收敛性与引入的参数因子、已知的检测数据的关系,并给出了改进的迭代外插算法.数值实验结果表明迭代外插算法迭代过程有时是发散的,存在半收敛问题,而改进的迭代外插算法是收敛的.     

采用瞬时梯度变化率判决的双模式盲均衡算法

为进一步提高恒模盲均衡算法的性能,文中提出了一种采用瞬时梯度变化率判决的双模式盲均衡算法。利用两次相邻均衡迭代前后的归一化权值变化量定义瞬时梯度变化率,并依此设置判据实现均衡迭代过程中的恒模算法和判决引导算法的适时切换,实现双模式盲均衡算法。双模式盲均衡算法可以有效结合恒模算法稳健和判决引导算法快速收敛和收敛精度高的优点,提高盲均衡算法的性能,计算机仿真结果证明了算法的有效性。     

基于粒子群优化的异常入侵检测算法的研究

提出了一种基于粒子群优化的异常入侵检测算法．首先,对基于动态聚类分析的异常入侵检测系统进行了建模和关键模块分析,对聚类算法区别正常和异常数据记录的过程,进行了详细的介绍,然后针对基本PSO算法存在的局部早熟收敛问题,利用改进的粒子属性进行了算法改进,增加了粒子多样性．通过初始化种群、更新速度、更新位置、计算每个粒子的适应度值、更新pgd、循环迭代,得到最优解．最后,利用该算法对基于聚类的入侵检测系统进行实验,结果显示该算法明显提升了入侵检测系统的正确率．     

基于分布式结构的判决反馈数据融合算法

提出了一种新的分布式结构下的故障检测算法·在该算法中,不仅用于故障检测的多传感器数据被传送到数据融合中心,而且上一时刻的判决输出也反馈到融合中心·从理论上分析了应用此算法时全局判决概率的动态收敛性能,并证明了在平稳环境中,融合中心DFC(datafusioncenter)的判决以概率1收敛·该算法处理动态问题优于传统的无反馈的融合算法·     

基于K-means聚类特征消减的网络异常检测

针对基础K-means算法在KDD 99数据集中检测罕见攻击效果差且效率低下等问题,该文通过数据统计的方式对数据集中各维度与每类攻击类型的相关分析发现,罕见攻击极易被大量的常见攻击所淹没,而当常见攻击被移去时,这些威胁性更大的罕见攻击则能够被更好地识别出来。基于此,该文提出一种改进的基于K-means分层迭代的检测算法,通过有针对性的特征选择来降低K-means聚类的数据维度,经过多次属性消减的K-means聚类迭代操作可以更加精准地检测到不同异常类型的攻击。在KDD 99数据集上的实验结果表明:该算法对原基础的K-means检测算法难以检测到的罕见攻击类型U2R/R2L攻击检测率几乎达到99%左右。同时随着每次分层迭代聚类维度近50%的降低,进一步节省了约90%的异常检测时间。     

基于数值分析理论的低复杂度MED算法

经典的最大特征值检测（MED）算法在检测相关信号时具有优异的性能.然而,随着信号维度的不断增大,MED算法面临着严重的感知判决量和判决门限计算的效率和实现问题,从而极大地限制了该算法在现代认知通信系统中的进一步应用.为此,提出了一种基于数值分析理论框架的低复杂度MED频谱感知算法.所提算法利用Rayleigh商加速幂法迭代地计算感知判决量,与经典的幂法相比,在检测高维信号时具有更快的收敛速度;此外,不同于经典的查表法,新算法基于三次样条插值法快速、准确地确定任意给定目标虚警概率所对应的感知判决门限.所提MED算法在保持原有算法检测性能的同时,有效提升了计算效率,降低了算法实现复杂度;其对于高维条件下的频谱感知问题尤其具有吸引力.最后,仿真结果证明了所提算法的有效性.     

重油催化裂化稳态过程数据协调与检测

最小二乘估计法和测量数据检验法用于重油催化裂化（ＦＣＣ）稳态过程的数据协调与检测．在正确构造ＦＣＣ系统的拓朴网络结构图之后，运用改进的迭代测量测试（ＭＩＭＴ）算法，成功实现了ＦＣＣ流量数据的协调，保证了数据的真实性和精确性     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

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-