基于优势关系粗糙集的规则生成算法

针对现有的基于优势关系粗糙集的规则生成算法存在运行效率低的问题,提出了一种基于多个优势差别矩阵的规则生成算法,突出不同决策类之间的差别信息,在得到精简规则集的同时,能够提高规则生成效率.通过实验与其他规则生成算法加以比较,表明该算法在平均性能方面优于其他算法.     

一种基于关联规则的缺省规则挖掘算法

传统的基于Rough集的缺省规则挖掘算法须计算差别矩阵并生成大量的条件属性类，挖掘效率低．为此，本文引入相容关联规则和决策关联规则的概念，提出基于关联规则的缺省规则挖掘算法——DRMBAR，该算法借助FP-tree存储结构挖掘出决策关联规则，并用相容关联规则性质对决策关联规则进行有效修剪后生成相应的缺省规则,DRMBAR可有效地过滤噪声、提高缺省规则挖掘效率，且克服了传统算法依赖于主存的限制，为缺省规则的挖掘提供了一种新的框架。实验结果表明该算法是有效且可行的。     

一种新颖的最小属性约简模型

传统的基于粗集的属性约简须计算差别矩阵并生成大量的条件属性类,效率低,且很多算法还不完备．为此,本文引入分类关联规则和相容分类关联规则的概念,给出基于分类关联规则的求解下近似和正区域的等价方法,从而提出基于分类关联规则的属性约简模型和算法,该模型将属性约简问题转化为求解一类特殊的分类关联规则集的问题,因而使得相应的算法可有效地改进属性约简挖掘效率,克服传统算法依赖于主存的限制,为属性约简提供了一种新的框架．理论分析表明该算法是有效且可行的．     

基于频繁闭项目集的关联规则挖掘算法

提出一种有效的基于频繁闭项目集的关联规则挖掘算法RIFCI．该算法采用挖掘频繁项目闭集取代传统的频繁项目集，同时在项目集和事务集中展开搜索．通过对UCI机器学习库中10个数据集的测试，与工业标准C4.5比较，错误率低于19．48％，在准确度不变的情况下，生成规则数目低于传统算法，提高了算法的效率．     

一种快速属性约简算法

基于差别矩阵的属性约简算法,先要求出差别矩阵,随着问题的规模增大,存放差别矩阵的空间和算法的执行时间过大和过长,让计算机难以承受．针对这一问题,提出了差别对象对集的定义,给出了基于差别对象对的属性约简定义,并证明了该定义等价于基于差别矩阵的属性约简定义．利用差别对象对,设计了一个新的属性约简算法．由于这一算法在求属性约简的过程中不用生成差别矩阵和大量的无用元素,因而大大减少了存储量和计算量,从而提高了算法的效率．计算实例说明了新算法的高效性．     

基于优势关系粗糙集的地震数据约简和规则提取

针对现有的基于不可分辨关系的数据约简算法在地震数据处理中存在的缺点,提出一个新的优势区分矩阵的定义,并在此基础上给出相应的具有更好约简效率的数据约简算法和规则提取算法.在运用该算法对全国小震目录数据进行的实验中,从上海市地震局提供的44 381条样本数据中挖掘出272条确定性规则,取得了有实际意义的结果.     

基于数据库约简的关联规则挖掘算法

通过对Apriori算法挖掘过程进行分析，提出了一种基于数据库约简的关联规则挖掘算法．该算法利用每趟挖掘中一些非频繁项集的超集、并集，逐步约简事务数据库中的事务，提高了关联规则的挖掘效率．在这些非频繁项集的基础上建立了数据库约简的定理和推论，并在Apriori算法的基础上设计了ApioriNEW算法．经过对算法进行分析和实验，算法ApioriNEW的挖掘效率比较高．一般情况下，平均可将挖掘效率提高约30%．ApioriNEW算法特别适合大型数据库的关联规则挖掘，已应用在网络故障诊断专家系统的知识获取中．     

利用项集有序特性改进Apriori算法

Apriori算法是挖掘关联规则的一个经典算法，通过分析、研究该算法的基本思想，并利用项集的有序特性对其进行改进，减少了生成的候选集数量，从而提高算法的效率．     

基于粒子群优化算法的模式分类规则获取

提出了基于粒子群优化的规则提取算法．该算法将规则编码为粒子,通过粒子群优化算法的速度-位移搜索模型以及粒子保存的记忆信息指导生成模式分类规则集．算法用于Iris数据集模式分类规则的提取．与其他规则提取方法比较,该算法在提高分类规则正确率的同时减少了计算费用．     

快速关联规则挖掘算法DPD

提出了一种快速关联规则挖掘算法DPD，算法通过模式分解，在每次遍在中减小模式量和模式长度，动态地减小数据集大小，从而有效减少候选关联规则的产生和计数的费用，提出了基于频繁集lk生成最长项目子集M(k）的FPS算法，DPD算法利用了M（k)进行模式分解，有效克服PD算法在|-Lk|很大时模式分解效率低的缺点，减少由Ck生成Ck 1时的遍历次数。     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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