role of ranking algorithms for information retrieval

... resources for information retrieval tasks. Natural language in- formation retrieval. Kluwer Academic Publishers Dordrecht, NL. Bruce Croft and John Lafferty. 2003. Language Mod- eling for Information Retrieval. ... Association for Computational Linguistics Examining the Content Load of Part of Speech Blocks for Information Retrieval Christina Lioma Department of Computing Science University of Glasgow 17 ... of Information Retrieval. 1 Introduction The task of an Information Retrieval (IR) system is to retrieve documents from a collection, in re- sponse to a user need, which is expressed in the form...

Ngày tải lên: 08/03/2014, 02:21

... 1979. Representation and classification of knowledge and information for use in interactive information re- trieval. In Human Aspects of Information Science. Oslo: Norwegian Library School. 148 ... constraints typical of DR systems. The modi~,cations are designed to recognize such aspects of discourse structure as establishment of topic; "setting of context; summarizing; concept foregrounding; ... alternative systems for each of the pro- posed modifications. In this experiment the original corpus of thirty abstracts (but not the prublem state- ments) is submitted to all versions of the analysis...

Ngày tải lên: 21/02/2014, 20:20

... carefully diluted with 1 : 100 (v/v) of the reaction mixture. For the preparation of thylakoid membranes for PSII activity, 5 mL of cell suspension was sonicated for 9 s in 25 m M Hepes (pH 7.5), ... ethanol. Modifications of SQDG The sulfonic residue of SQDG was methylated by incuba- tion with diazomethane in ether after being protonated by the addition of 0.1 M HCl [22]. For oxidation of the sulfoquinovose of ... Hongo, Tokyo, Japan; 3 Department of Integrated Biosciences, Graduate School of Frontier Sciences, the University of Tokyo, Kashiwa, Chiba, Japan The physiological role of sulfoquinovosyl diacylglycerol (SQDG)...

Ngày tải lên: 22/02/2014, 04:20

... profitably ap- plied. It also provides a criterion for building lex- ical resources for specific domains. It can be ap- plied in a semiautomatic way. It has the advan- tage of using the information ... WordNet the field labels that are interesting for the domain 227 Proceedings of EACL '99 The Development of Lexical Resources for Information Extraction from Text Combining WordNet ... is one of the main bot- tlenecks in the development of new ap- plications in the field of Information Ex- traction from text. Generic resources (e.g., lexical databases) are promising for reducing...

Ngày tải lên: 08/03/2014, 21:20

... probe for the B. mori elongation factor a-1 isoform as an internal control. Fig. 5. Analysis of H-chain, L-chain and two different forms of fhx/P25 in protein samples from cocoon shells of the ... : 6.09 ± 0.04 : 1 Ó FEBS 2003 Role of L-chain in the elementary unit of fibroin (Eur. J. Biochem. 271) 361 Fig. 6. Models for a role of L-chain in the protection of a1,2-mannose residues in N-linked ... play respective roles in the formation of the integral structure of the elementary unit of fibroin. Acknowledgements We thank Kazuko Seo and Hiroko Yamazaki, National Institute of Agrobiological Sciences, for...

Ngày tải lên: 16/03/2014, 16:20

... parameters For If Then Else Output: Parameter vectors for Figure 3: The perceptron training algorithm for ranking problems. Define: . Input: A set of candidates for , A sequence of parameter vectors for Initialization: ... is the correct sequence of tags for that sentence. We assume some way of enumerating a set of candidates for a particular sentence. We use to denote the ’th candidate for the ’th sentence in training ... LWLC= Bigram boundary features of the words before/after the start of the entity BO00= BO01= BO10= BO11= Bigram boundary features of the words before/after the end of the entity BE00= BE01= BE10= BE11= Trigram...

Ngày tải lên: 17/03/2014, 08:20

... shallow and partial represen- tation of the content of documents. Information retrieval thus poses the genuine chal- lenge of processing large volumes of unrestricted natural-language text ... Proceedings of the 33th Annual Meeting of the Association for Computa- tional Linguistics. David Lewis and K. Sparck Jones. 1996. Natural language processing for information retrieval. Communications ... an information retrieval system. The noun-phrase analysis techniques are also potentially useful for book indexing and automatic thesaurus extraction. 1 Introduction 1.1 Information Retrieval...

Ngày tải lên: 17/03/2014, 09:20

... However, specialized software for doing analysis is the heart of business intelligence. This software is an outgrowth of the software used for decision support and executive information systems ... Management of Information Systems from Claremont Graduate University Copyright â 2004 by the Association for Information Systems. Permission to make digital or hard copies of all or part of this ... continuous exchange of relevant and essential financial, transactional and operational information. ” [BPM Forum, 2003]. 186 Communications of the Association for Information Systems (Volume...

Ngày tải lên: 23/03/2014, 02:20

... location of the flavin cofactor. The distance between N1 of the flavin cofactor and N e1 of tryptophans 47, 52, 131, 204 are 33.6 A ˚ , 22.7 A ˚ , 25.1 A ˚ , 29.5 A ˚ , respectively. In the dimeric form, ... quantum yield of the flavin cofactor in NADH oxidase (F ¼ 0.02) is smaller than that of free FAD in solution (F ẳ 0.05). The position of the tryptophans and the avin cofactor in the crystal structure of ... doi:10.1046/j.1432-1033.2003.03889.x conformation of proteins because the enzyme activity of a number of proteins is unaffected in the presence of acrylamide [29]. Discussion Activation of NADH oxidase is caused...

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Ngày tải lên: 14/04/2015, 13:52

... al., 1996) is a probabilistic model for information retrieval and is one of the most popular and effective algorithms used in in- formation retrieval. For ease of reference, we in- corporate the ... provides information about the gen- eral distribution of term i amongst documents of all classes, without providing any additional evi- dence of class preference. The utilization of idf in information ... per- formance of the former tend to be superior to that of the latter (Mullen and Collier, 2004; Lin and He, 2009). One of the main issues for supervised approaches has been the representation of...

Ngày tải lên: 20/02/2014, 04:20

... the found set of features for text classification (index- ing) for an OIR query of the first level (finds opin- ionated information) and for an OIR query of the second level (finds opinionated information ... of features for retrieval of Chinese opinionated information. As stated earlier (see Section 1), we assume that the task of retrieval of opinionated texts (OIR) can be regarded as a subtask of ... paper presents the results of experi- ments in which we tested different kinds of features for retrieval of Chinese opinionated texts. We assume that the task of retrieval of opinionated texts (OIR)...

Ngày tải lên: 20/02/2014, 12:20