2022年英文全文数据库搜索 .pdf

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1、（四）利用英文全文数据库Elsevier 进行文献信息检索示例1、检索课题名称：现代建筑结构体系研究 2、课题分析：“现代建筑”属于本课题中的主体，其应用目标是“结构体系”的研究，而“研究”是句法修饰，故“研究”可不作为检索词，由此得出如下检索词（按其对课题影响程度排序）：中文关键词为：1 现代建筑 2 结构体系英文关键词为：（1）Model architacture（2）Structure system 3、选择检索工具：Elsevier 数据库4、构建检索策略：Model architacture Structure system 5、简述检索过程:选定在 Elsevier 中期刊、图书、

2、文摘数据库等全部文献资源中检索1996 年以后的关于现代建筑结构体系研究的相关文献。利用确定的检索策略（Model architacture Structure system），文献全文（含文献题目、摘要、关键词）中检索，检到 8728 篇相关文献；在文献题目、摘要和关键词中检索，检索到 1212 篇相关文献；在文献关键词中检索到 134 篇相关文献；在文献题目中检索到 178 篇相关文献。6、整理检索结果：从以上文献中选择出3 条切题文1 Component-based discriminative classification for hidden Markov models Origin

3、al Research ArticlePattern Recognition,Volume 42,Issue 11,November 2009,Pages 2637-2648名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 7 页 -Manuele Bicego,El?bieta Pe?kalska,David M.J.Tax,Robert P.W.Duin|PDF(316 K)|Related articles|Related reference work articles 2 Chapter 3 Psychosocial Value of architactureSimulat

4、ion for Extended Spaceflight Original Research ArticleAdvances in architacture Biology and Medicine,Volume 6,1997,Pages 81-91Nick Kanas|Related articles|Related reference work articles3 Multidimensional Data Structures:Review and OutlookOriginal Research ArticleAdvances in Computers,Volume 27,1988,P

5、ages 69-119S.Sitharama Iyengar,N.S.V.Rao,R.L.Kashyap,V.K.Vaishnavi|Related articles|Related reference work articles6、全 文 摘 录 选 择 一 篇：Component-based discriminative classification for hidden Markov models一、篇名Component-based discriminative classification for hidden Markov models名师资料总结-精品资料欢迎下载-名师精心整理-

6、第 2 页，共 7 页 -二、著者Manuele Bicego三、著者机构El?bieta Pe?kalskac,David M.J.Taxd,Robert P.W.Duind四、文摘Hidden Markov models(HMMs)have been successfully applied to a wide range of sequence modeling problems.In the classification context,one of the simplest approaches is to train a single HMM per class.A test se

7、quence is then assigned to the class whose HMM yields the maximum a posterior(MAP)probability.This generative scenario works well when the models are correctly estimated.However,the results can become poor when improper models are employed,due to the lack of prior knowledge,poor estimates,violated a

8、ssumptions or insufficient training data.To improve the results in these cases we propose to combine the descriptive strengths of HMMs with discriminative classifiers.This is achieved by training feature-based classifiers in an HMM-induced vector space defined by specific components of individual hi

9、dden Markov models.名师资料总结-精品资料欢迎下载-名师精心整理-第 3 页，共 7 页 -We introduce four major ways of building such vector spaces and study which trained combiners are useful in which context.Moreover,we motivate and discuss the merit of our method in comparison to dynamic kernels,in particular,to the Fisher Kerne

10、l approach.五、关键词Keywords:Hidden Markov models;Discriminative classification;Dimensionality reduction;Hybrid models;Generative embeddings 六、正文Component-based discriminative classification for hidden Markov models（首段）The HMMs are fitted to model a single class well,but this may lead to poor discrimina

11、tion as the models are not optimized to differentiate among the classes.We propose to derive a fixed-dimensional feature space from the trained generative HMMs,in which discriminative classifiers are trained.We call this an HMMVS,equipped with the traditional norm and Euclidean metric.Every feature

12、is extracted from a 名师资料总结-精品资料欢迎下载-名师精心整理-第 4 页，共 7 页 -specific HMM and conveys information about the corresponding class.In essence,this approach maps variable-length observation sequences into a vector space,and by doing this it integrates the modeling potential of one-class models with discrimin

13、ative classifiers.HMMVS are based on“Component Information”features,CIs,which describe some relevant information extracted from particular components of the models,in relation to the input sequence O.A CI feature either characterizes some properties of the generation path of the sequence O through t

14、he model cor the strength with which a specific component of c“responds”to O.More formally,FCI(,c):OcRmc is a model-dependent mapping defined by mccomponents derived from c.The final HMM-induced vector space is a Cartesian product of all CI-spaces(one for each class)（末段）This application aims at the

15、examination of EEG signals in order to distinguish between alcoholic and control subjects,http:/kdd.ics.uci.edu/databases/eeg.Each subject was exposed to either a single stimulus(S1)or two stimuli(S1 and S2)which were pictures of objects chosen from the 1980s Snodgrass and Vanderwart picture set.Whe

16、n two stimuli were shown,they were presented in either a matched condition where 名师资料总结-精品资料欢迎下载-名师精心整理-第 5 页，共 7 页 -S1 was identical to S2 or in a non-matched condition where S1 differed from S2.There are three different versions of the data.In our case,we use the Large Data Set,denoted here denote

17、 it as Alcoholic data,in which the training and test sets are already pre-defined.The training set contains data for 10 alcoholic and 10 control subjects,with 10 runs per subject per paradigm.This results in 600 training sequences.The test data use the same alcoholic and control subjects,but with 10

18、 out-of-sample runs per subject per paradigm.This results in 600 test sequences.Each data set contains measurements from 64 electrodes placed on the scalp sampled at 256 Hz(3.9-ms epoch)for 1 s.We select the first two channels only,as they permitted an almost perfect discrimination in the case of“sm

19、all dataset”.All HMMs are trained with the same number of states 七、参考文献Referenc 1。L.RabineroA tutorial on hidden Markov models and selected applications in speech recognition 名师资料总结-精品资料欢迎下载-名师精心整理-第 6 页，共 7 页 -oProceedings of the IEEE,77(2)(1989),pp.257286 oView Record in ScopusFull Text via CrossR

20、ef|Cited By in Scopus(6544)2.oF.Jelinek oStatistical Methods for Speech Recognition oMIT Press,Cambridge,MA(1998)o3.oE.V.F.Casacuberta,J.M.Vilar,Architectures for speech-to-speech translation using finite-state models,in:Workshop on Speech-to-Speech Translation:Algorithms and Systems,ACL,Philadelphia,2002,pp.3944 名师资料总结-精品资料欢迎下载-名师精心整理-第 7 页，共 7 页 -