Download e-book for kindle: Classifying and Searching Hidden-Web Text Databases by Panagiotis G. Ipeirotis

By Panagiotis G. Ipeirotis

ISBN-10: 0496061895

ISBN-13: 9780496061891

The World-Wide internet maintains to develop quickly, which makes exploiting all on hand info a problem. se's comparable to Google index an exceptional quantity of knowledge, yet nonetheless don't offer entry to worthwhile content material in textual content databases "hidden" at the back of seek interfaces. for instance, present se's principally forget about the contents of the Library of Congress, the united states Patent and Trademark database, newspaper documents, and lots of different priceless assets of data simply because their contents aren't "crawlable." even if, clients could be capable of finding the data that they wish with as little attempt as attainable, whether this data is crawlable or no longer. As an important step in the direction of this target, we have now designed algorithms that aid shopping and searching-the dominant methods of discovering details at the web-over "hidden-web" textual content databases.

Show description

Read Online or Download Classifying and Searching Hidden-Web Text Databases PDF

Similar algorithms and data structures books

Download e-book for kindle: An Introduction to Quantum Computing Algorithms by Arthur O. Pittenger (auth.)

In 1994 Peter Shor [65] released a factoring set of rules for a quantum machine that unearths the major components of a composite integer N extra successfully than is feasible with the recognized algorithms for a classical com­ puter. because the hassle of the factoring challenge is important for the se­ curity of a public key encryption approach, curiosity (and investment) in quan­ tum computing and quantum computation by surprise blossomed.

Algorithmic and Register-Transfer Level Synthesis: The - download pdf or read online

Lately there was elevated curiosity within the improvement of computer-aided layout courses to aid the process point clothier of built-in circuits extra actively. Such layout instruments carry the promise of elevating the extent of abstraction at which an built-in circuit is designed, therefore freeing the present designers from some of the info of common sense and circuit point layout.

Download e-book for kindle: The Logic of Logistics : Theory, Algorithms, and by David Simchi-Levi, Xin Chen, Julien Bramel

As above. this can be five+ famous person theoretical booklet that exhibits the dramatic hole among the academia and the undefined. i'm asserting this from my very own event: 20+ years within the academia and now answerable for designing optimization items for big logistic corporation. As one smart man stated: "academics do what's attainable yet no longer wanted, practitioners do what's wanted yet now not possible".

Extra info for Classifying and Searching Hidden-Web Text Databases

Example text

This technique ensures that the final number of matches for each category is not artificially inflated by documents that match multiple query probes. Unfortunately, if implemented in a naive way, this overlap-elimination strategy may result in rather long query 2. 2: Sending probes to the ACM Digital Library database with queries derived from a document classifier. probes, which might not be accepted by the databases. This problem could be partially solved by “breaking” the long queries into smaller conjunctive queries.

3: Generating rules from a set of weights wi and a threshold b. , it matches more correct documents than incorrect ones). The terms that form an extracted rule are removed from further consideration and will not participate in later iterations of the algorithm. Also, training examples that match a produced rule are removed from the training set, and will not be used in later iterations. To proceed to the next iteration, the algorithm expands unused term sets by one term, in a spirit similar to an algorithm for finding “association rules” [AS94].

Cn is an n × n matrix, where mij is the sum of the number of matches generated from documents in category Cj for category Ci query probes, divided by the total number of documents in category Cj . In a perfect setting, the probes for Ci match only documents in Ci and each document in Ci matches exactly one probe for Ci . In this case the confusion matrix is the identity matrix. The algorithm to create the normalized confusion matrix M is: 1. , the development set). 2. Create an auxiliary confusion matrix X = ( xij ) and set xij equal to the sum of the number of matches from Cj documents for category Ci query probes.

Download PDF sample

Classifying and Searching Hidden-Web Text Databases by Panagiotis G. Ipeirotis


by John
4.5

Rated 4.13 of 5 – based on 12 votes