基于扩展区间编码的XML兄弟关系结构连接

针对以前兄弟位置关系的结构连接需要索引才能获得较好性能的情况,提出了扩展的EX-Dietz编码方案.该编码方案把每个结点译码为4元组,包含了兄弟位置的初始信息.利用该编码可以有效判断结点的兄弟位置关系,并利用队列数据结构,只需要扫描一次P和F列表,就可以实现基于该编码的兄弟位置关系的结构连接计算.实验结果显示,该方法具有较好的时问性能.     

用改进的界限法求解大型稀疏线性方程组

在求解大型稀疏线性方程组中,基于索引信息界限思想,本文提出一个新的数据结构,以非零元同等数量索引信息压缩存储稀疏系数矩阵。除每行第一个非零元存入一个界限信息外,其他非零元均只存入相应列标。矩阵的压缩还原过程仅需执行O(n)次加减运算.消元过程还运用存储复盖技术,从而进一步大幅度降低存储量,提高运算速度。该法已编制标准过程并以实例上机通过。     

蚁群算法在工艺规划与车间调度集成优化中的应用

为了解决工艺规划与车间调度集成(IPPS)问题,提出了一种改进的蚁群优化(ACO)算法.通过节点集、有向弧集、无向弧集,构建了一种基于图的IPPS优化模型.以零件加工时间作为启发式信息,设计蚂蚁在各节点间转移概率.通过蚂蚁访问图中不同的节点,构建对应的调度方案.根据不同阶段调度方案的最大完工时间调整各弧段信息素的挥发速度,提高了蚂蚁的搜索效率.为避免陷入局部收敛,通过重启算法和重置各弧段信息素初值,动态更新各弧段信息素量,以获得全局最优解.将该算法应用于具体的仿真实例,结果表明该算法能有效地解决工艺规划与调度集成问题,为企业生产提供借鉴.     

带距离矩阵计算的矢量中值滤波快速算法

为提高彩色图像中的经典矢量滤波算法和其扩展算法的运算效率,提出了一种针对滤波窗口内带矢量距离矩阵计算的滤波快速算法.通过分析当前像素滤波窗口的矢量距离矩阵与邻近像素矢量距离矩阵之间的关系,设计了一种滤波窗口内像素的排列规则.新矢量距离矩阵的值大部分可来自于邻近多个像素存储的矢量距离值.该新方法能够保持与原方法相同的滤波效果,且适合于任意大小滤波窗口.实验给出了多种矢量滤波的使用前后滤波时间,结果显示快速算法能够在常见滤波窗口下减少计算时间约50%~70%.     

非线性动态网络的通用分析方法与故障诊断

基于规范式分段线性化总体表达式并应用网络的一些基本知识,列出了非线性动态网络规范式分段线性化方程组.用该法分析动态网络无需计算响应跨越边界的时间,并能将整个动态过程的计算转化为代数的递推运算.在动态网络响应易于用计算机仿真的基础上,提出了基于小波-神经网络的非线性动态网络故障诊断的基本思想.     

基于简单最邻近搜索算法的高维特征索引

研究了220 kV/330 kV高压带电清扫机器人的绝缘瓷瓶视觉识别系统中的高维特征索引问题.该系统采用了基于局部尺度不变性特征的方法,在生成匹配假设的过程中,尝试将简单最邻近搜索算法用于高维特征的索引.在离线阶段,对给定向量集合中每个向量的每一维进行排序,生成排序的数据结构.在线搜索阶段:①对排序数据结构的第一维确定位于边界条件内的所有向量,构成候选队列;②依次检查候选队列中向量的其他维,剔除不满足边界条件的向量;③采用穷举法寻找与查询向量最邻近的向量.比较了简单最邻近搜索算法和k-d树算法.实验结果证明,简单最邻近搜索算法用于具有更强的边界约束,通过选择合适的边界条件能够获得更高的运算效率.该算法能广泛用于基于高维特征的物体识别和定位.     

一种基于单调链和Geohash索引的公共边裂缝处理算法

在分析矢量数据压缩时产生公共边裂缝的原因以及解决该问题的常用方法的优缺点的基础上,提出一种基于单调链和Geohash的公共边裂缝处理算法.首先,算法采用单调链扫描线算法从图形集中为每一个矢量图形快速确定可与之相交的图形子集;其次,利用Geohash索引快速查找相交图形的公共点,继而提取出公共边和非公共边;然后,设计一个索引结构存储公共边的压缩信息,用于公共边只压缩一次的前提下保证图形集的完整性;最后,从有效性和时间效率2个方面对算法进行分析和评价.实验结果表明,算法对图形进行逻辑分段保证了公共边在相邻图形中化简结果的一致,与目前比较优秀的同类算法相比,在可行性以及在时间效率上都具有一定的优越性.     

基于扩展邻域的动态方向GVF计算方法

采用基于动态方向梯度矢量流(GVF)分割边界不清晰、灰度分布不均图像时,GVF外力场中通过拉普拉斯算子的扩散作用,利用4邻域进行掩膜运算;但未充分利用图像信息形成光滑的矢量场,同时迭代次数较高。提出一种基于扩展邻域的动态方向GVF计算方法。新方法从掩膜的角度分析了梯度矢量流模型,通过采用更大的邻域的掩膜来代替原来的基于4邻域的掩膜,得到了基于扩展邻域的梯度矢量流的计算方法。新的计算方法仅仅需要较少的迭代次数就能得到较好的效果。     

表面矢量编码的查找表算法

针对体绘制计算中严重影响绘制速度的光照效果处理运算,提出了利用表面矢量编码为索引,构造光照效果计算查找表的规划方法.算法编码简单,数据运算中内存的开销小,运算速度快,实际应用效果良好.     

一种基于FCD的城市道路车流速度估计算法

针对在城市路网中大面积采集交通信息所存在的问题,提出了一种基于浮动车辆数据(floating car data,FCD)的城市道路车流速度估计算法,并通过FCD系统进行交通速度信息的采集.速度估计采用了一种改进的弧段Dijkstra路径寻优算法,在图的弧段-弧段存储结构中考虑了城市路网限制性道路交通信息的表达,并将路网的一些先验信息引入弧段关系结构中,提高了搜索效率和准确性.实验结果论证了所提出方法的有效性和可靠性.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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