基于字典统计耦合归一化多重距离的图像检索算法

针对当前彩色图像检索技术容易受到色彩干扰,鲁棒性不强等不足,提出了一种字典统计耦合归一化多重距离的彩色图像检索算法.首先,将图像量化并转换成一维信号;然后,引入字典统计,将一维信号进行字典编码,并计算编码后的图像多样值;在归一化字典距离的基础上,嵌入字典编码图像的多样值,从而定义了归一化多重距离(NMD)的相似度量准则,利用NMD对查询图像与数据库图像的多样值进行比较与识别,搜索出与查询图像具有相同特征的最相似图像,完成目标检索.在COREL数据库的实验结果表明:相对于当前常用的检索技术,该检索算法具有更高的查准率和查全率,可对彩色图像完成精确检索,有效减低了色彩对检索性能的干扰.     

分类Cache库在Web查询系统中的应用

利用分类Cache库技术可以解决对已检索到的Web信息的再利用问题,通过使用分类Cache库,不但可以减少重复检索Web的次数,提高查询系统的效率,而且还可以对已检索到的Web信息实现基于语义的精确查询,提高系统的查询精确度.重点介绍了Web查询系统中分类Cache库的构造、管理与维护.     

我国沿海常见浮游植物检索数据库的建立

利用本实验室保存的固定和活体硅藻标本,并采集我国沿海常见海洋浮游植物样品,特别是赤潮生物样品,通过数码显微摄影技术,采集不同侧面的藻细胞形态特征图像,同时结合其他手段收集我国沿海常见海洋浮游植物的图片和文字资料.通过net(c#)语言、asp.net等技术初步建立了我国沿海常见浮游植物网络检索数据库,其网络查询界面可实现多分类参数查询.目前该数据库已收录我国常见浮游植物144种,特征图片704张,以硅藻门(93种)和甲藻门(40种)为主.同时对每个种类的分类特征和生态分布特点进行了归类与集成,可通过其细胞主要特征参数或生态分布特征等参数进行详细的信息检索.该数据库为目前国内首个沿海常见浮游植物网络分类数据库.本文简要介绍了建库目标、系统结构、功能与特点,并对该库应用前景作了探讨.     

关于中国少数民族濒危语言语音语料库的设计

建立中国少数民族濒危语言语音语料库的目的在于使濒于消失的少数民族语言的声音永久而系统地保存下来，并能使国内外语言学习、研究者方便地进行大规模语音资料的查询、检索和统计。语料库的特点和作用、工作步骤及建库过程中遇到的难点与汉语或非濒危语言语音数据库有所不同。     

基于特征的图象查询和检索系统

介绍了一个基于特征的图象查询和检索系统．该系统由查询模块、特征提取和描述模块、匹配模块、图象显示模块和图象库管理模块组成．系统既支持基于颜色、纹理、形状的单一特征查询,也支持结合不同特征的更符合视觉要求的综合特征查询．该系统已结合实际图象库进行了查询和检索实验,中给出一些实际检索结果。     

基于Web services的图书数据检索平台的研究

随着各个高校购进数据库的增加,随着网络技术的发展和图书管理工作网络化的需要,各图书管理系统已经纷纷由＂各自为政＂的独立化管理向网络化管理转化,读者查询资料的步骤也变得更加繁琐。大部分高校的图书馆为每个专题数据库提供一个检索入口,这样当读者想要检索某个数据库的资料时,就必须进入该数据库的检索入口来查询资料,这给查询带来很大的不便。所以迫切需要实现对不同数据库数据资源的整合,实现统一检索。只有建立一个良好的统一检索平台,使用户可以通过一次查询便可得到所有满足用户需求的查询结果,才能确保查询的效率和质量。     

基于语句特征的音乐哼唱快速检索技术

哼唱检索作为音乐检索的重要方式,由于其有效性和方便性,引起了广泛的关注.本文提出了一种新的基于语句特征的音乐哼唱快速检索技术,可以实现哼唱音乐的快速检索.该技术将音乐数据库和用户提供的哼唱片段,按自然停顿方式划分音乐语句,使用BDTW算法对音乐语句片段进行音高相似性计算,并允许用户根据自己哼唱情况,对匹配条件进行个性化设置,限制数据库音乐片段和查询序列的局部最大差异长度.另外,对音乐库建立支持音乐语句查询的索引结构DIS,减少了检索时间.实验结果表明所提出的检索方法能够快速有效地返回查询结果.     

常用国内五大可检生物医学类引文数据库的比较分析

目的:了解常用国内五大可检生物医学类引文数据库的优缺点.方法:从来源期刊、涵盖学科、收录范围、更新频率、检索途径、检索功能等多方面对《CSTPC》、维普(引文版)、《CJFD》、《CMCI》、《CBMdisc》五大数据库进行对比分析;通过实例操作进行检索结果分析.结果:五大引文数据库在收录数据、检索途径、检索功能上各有特色,可相互补充和借鉴,但各数据库仍存在一些问题与不足.结论:在实际应用中应联合使用这5种数据库,以提高查询质量.各数据库亦应进行改进、完善,缩短与国际大型权威数据库的差距,在引文查询、分析研究中发挥更重大的作用.     

基于Oracle Spatial的导航数据库的建立方法

针对导航数据的时空特性,在分析Oracle Spatial特性的基础上,研究基于Oracle Spatial的导航数据库的建立方法,并对建立的导航数据库进行了2种方式的查询应用.结果表明,基于Oracle Spatial的导航数据库实现了空间数据和属性数据一体化存储,使得导航数据库的检索、更新和查询等功能更加便捷.     

天然产物C_(13)-NMR数据库检索

本文主要介绍了“天然产物G_(13)-NMR数据库应用系统”的数据检索功能及采用数据库的定位检索或不定位的模糊检索等方法可进行的相应查询.该系统可以较好地实现对数据库中各种特征数据的检索,基本满足对数据库检索功能的要求,具有较高的时空效率和较好的可移植性.用户还可以对数据库中数据的特征,性质和规律等进行研究,或在对部分已知信息进行检索的基础上,有效地缩小未知化合物的搜索空间,达到辅助图谱解析的目的.     

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.     

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     

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

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