Author: J. B. FriedPublisher:
ISBN:
Category : Indexing
Languages : en
Pages : 22
Book Description
Index Simulation Feasibility and Automatic Document Classification
Author: J. B. FriedAutomatic Indexing: a State-of-the-art Report
Author: Mary Elizabeth StevensPublisher:
ISBN:
Category : Automatic indexing
Languages : en
Pages : 300
Book Description
Simulating Information Retrieval Test Collections
Author: David HawkingPublisher: Morgan & Claypool Publishers
ISBN: 1681739585
Category : Science
Languages : en
Pages : 186
Book Description
Simulated test collections may find application in situations where real datasets cannot easily be accessed due to confidentiality concerns or practical inconvenience. They can potentially support Information Retrieval (IR) experimentation, tuning, validation, performance prediction, and hardware sizing. Naturally, the accuracy and usefulness of results obtained from a simulation depend upon the fidelity and generality of the models which underpin it. The fidelity of emulation of a real corpus is likely to be limited by the requirement that confidential information in the real corpus should not be able to be extracted from the emulated version. We present a range of methods exploring trade-offs between emulation fidelity and degree of preservation of privacy. We present three different simple types of text generator which work at a micro level: Markov models, neural net models, and substitution ciphers. We also describe macro level methods where we can engineer macro properties of a corpus, giving a range of models for each of the salient properties: document length distribution, word frequency distribution (for independent and non-independent cases), word length and textual representation, and corpus growth. We present results of emulating existing corpora and for scaling up corpora by two orders of magnitude. We show that simulated collections generated with relatively simple methods are suitable for some purposes and can be generated very quickly. Indeed it may sometimes be feasible to embed a simple lightweight corpus generator into an indexer for the purpose of efficiency studies. Naturally, a corpus of artificial text cannot support IR experimentation in the absence of a set of compatible queries. We discuss and experiment with published methods for query generation and query log emulation. We present a proof-of-the-pudding study in which we observe the predictive accuracy of efficiency and effectiveness results obtained on emulated versions of TREC corpora. The study includes three open-source retrieval systems and several TREC datasets. There is a trade-off between confidentiality and prediction accuracy and there are interesting interactions between retrieval systems and datasets. Our tentative conclusion is that there are emulation methods which achieve useful prediction accuracy while providing a level of confidentiality adequate for many applications.
Research in Education
Author: Resources in Education
Author: Subject Analysis Methodologies
Author: E. D. DymPublisher: CRC Press
ISBN: 9780824773540
Category : Language Arts & Disciplines
Languages : en
Pages : 518
Book Description
Your choice for a text n document analysis is no longer limited to books containing only one specific method. This workbook of Readings-representing an introductory. state of the art approach to document analysis-combines a full range of subject analysis techniques into a comprehensive, single source volume.
ERIC Educational Documents Index, 1966-69: Minor descriptors and author index
Author: NBS Monograph
Author: ERIC Educational Documents Index
Author: Educational Resources Information Center (U.S.)Publisher:
ISBN:
Category : Education
Languages : en
Pages : 820
Book Description
"A subject-author-institution index which provides titles and accession numbers to the document and report literature that was announced in the monthly issues of Resources in education" (earlier called Research in education).
Investigation of the Hydraulics of Horizontal Drains in Plumbing Systems
Author: Robert S. WylyPublisher:
ISBN:
Category : Drainage, House
Languages : en
Pages : 520
Book Description
Results are reported from an investigation of the hydraulics of flow in experimental apparatus simulating nominally horizontal simple and branching drains of plumbing systems. The data are correlated with limited findings in an earlier, unpublished NBS study the results of which have been utilized in current plumbing codes. The need for further research is pointed out, particularly in relation to hydraulic performance of drain systems as affected by steep slopes, drain storage volume, energy losses at stack bases, attenuation of water depths and discharge rates in long drains, and large drain diameters.