自适应暂态混沌神经网络在CDMA多用户检测器中的应用

提出一种自适应变尺度暂态混沌神经网络，并将其应用于CDMA的多用户检测技术。该算法在优化搜索过程中根据暂态混沌神经网络能量函数的变化调整网络参数，自适应地控制能量函数对神经网络动力学特性产生良好的影响。仿真结果表明，基于改进的自适应混沌神经网络算法的多用户检测器能够有效地逼近CDMA的最优多用户检测器的性能。     

混沌差分进化算法在复杂优化问题中的应用研究

差分进化算法求解复杂优化问题时,由于进化后期种群多样性降低,算法极易陷入局部最优值无法跳出.论文针对该问题,将差分进化算法和混沌优化方法耦合,构建了混沌差分进化算法.算法利用混沌序列的遍历性和内部迭代的随机性,弥补差分进化算法容易陷入局部最优的缺陷,从而提高算法的搜索性能.对几种典型函数的测试结果表明:混沌差分进化算法的全局搜索性能有了显著提高,能有效避免算法陷入局部最优.因此,与标准差分进化算法和混沌优化算法相比,该算法在求解复杂优化问题时更加可行、有效.     

并行混沌优化算法在分包商选择中的应用

为了提高工程优化问题的寻优效率,提出一种用于求解优化问题的改进并行混沌优化算法。根据当前解中精英个体的分布情况从优化变量的定义域中划分出精搜索空间。在优化过程中,精搜索空间不断缩小,搜索概率不断增加,这可保证算法具有较快的收敛速度。同时,算法始终以一定概率保持对原搜索空间进行混沌搜索,这可保证算法始终具有全局寻优能力。函数优化以及分包商选择等组合优化问题可利用该算法进行有效求解。仿真实验结果表明:对于相同的优化问题,改进的并行混沌优化算法可以求得更好的优化解,从而证明该方法具有良好的寻优性能。     

一种混沌神经网络及在优化计算中的应用

提出了一种混沌神经网络模型。在Hopfield网络中引入混沌机制,首先在混沌动态下搜索,然后利用HNN梯度优化搜索。对非线性函数的优化问题仿真表明算法具有很强的克服陷入局部极小能力。     

一种基于种群熵的混沌小世界优化算法

针对小世界算法在复杂函数优化中存在的停滞现象,以及低局域短连接的搜索效率问题,提出了一种基于种群熵的混沌小世界算法.根据信息熵建立了种群个体浓度,并以个体浓度和个体适应度作为评价标准进行高浓度的个体更替,从而实现了种群的自我调节和多样性保持.利用混沌变量的遍历性和随机性,通过Logistic映射生成初始种群,采用混沌扰动对短连接后的个体进行局部搜索,从而提高了小世界算法的搜索效率和搜索精度.试验结果表明,该算法不仅明显改善了小世界算法的搜索能力,而且搜索效率也得到了显著提高.     

基于混沌人工蜂群算法优化的SVM 齿轮故障诊断

为克服支持向量机中模型参数的随意选择对分类性能造成的不利影响, 提出了基于混沌人工蜂群算法的支持向量机(CABC鄄SVM: Chaotic Artificial Bee Colony algorithm of Support Vector Machine)参数优化方法。该方法采用Logistic 混沌映射初始化种群和锦标赛选择策略, 对支持向量机的惩罚因子和核函数参数进行优化时以分类准确率作为适应度函数。通过UCI 标准数据集实验证明, CABC 具有较强的局部和全局搜索能力, 其优化的支持向量机可在很大程度上克服局部极值点, 从而获取更高的分类准确率, 并有效缩短了搜索时间。将该方法应用于实际齿轮故障诊断中, 采用小波相对能量作为特征输入支持向量机, 分类准确率达到99. 4%, 验证了该方法的可行性和有效性。     

寡头垄断市场下量本利复杂性分析

以动态古诺模型为基础,在需求函数是非线性、成本函数是线性的情况下分析了企业的量本利动态演化的博弈模型,对离散动态系统的Nash均衡的稳定性进行了分析．当模型的某些参数在一定范围内变化时,Nash均衡点失去稳定性,经倍周期分叉后出现混沌态．结果表明,参与人对产量的调整速度越小或单位变动成本越大,其利润就越稳定．同时用数值方法模拟了2个参数同时变化时系统复杂的动态性．从2个参数同时变化时的等周期图和混沌图,可观察到导致周期态、混沌态的不同路径．     

一种函数优化问题的混沌遗传算法

混沌作为一种非线性动态系统中的现象，受到了人们的重视，给出一种结合混沌优化方法和遗传算法的混沌算法，实验表明，它通过对问题的解空间交替进行全局和局部搜索，能更有效地求解函数优化问题。     

基于混合混沌搜索方法的多层递归模糊神经网络建模

提出了一种多层递归模糊神经网络（MRFNN）,并提出混合混沌搜索方法用于网络学习。该网络融合了T—S模糊模型．在隶属函数层和规则层有局部反馈连接。网络的学习分为结构学习和参数学习两部分。结构学习确定隶属函数层和规则层的节点数;参数学习由混合混沌搜索方法完成,利用混沌搜索优化前件参数。同时利用最小二乘法实现后件系数更新。对非线性系统辨识进行,仿真实验并对连续搅拌釜式反应器系统建模。结果表明：本文方法能够有效捕捉系统的动态特性。所建模型具有良好的精度。     

任务分配问题的瞬态沸混沌神经网络解法

采用具有瞬态混沌特性的神经网络（TCNN）解任务分配问题,该方法利用神经元的自反馈产生混沌动态,由于混沌动态特性具有很强的搜索全局最优妥的能力,有效地避免了传统Hopfield神经网络（HNN）极易陶入局部极小的缺陷,同时利用时变参数控制混沌行为,使网络在经过一个矩暂的混沌倒分岔后逐渐于一般的Hopfield神经网络,保证网络收敛到一个最优或近似最优的稳定平衡点。仿真结果表明,TCNN解任务分配问题时,总能收敛到全局最优或几乎接近全局最优,同时具有更高的搜索效率,另外,还用此方法求解了属于NP－完全问题的实时分布处理系统的任务分配问题。     

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-