Computation of term/document discrimination values by use of the cover coefficient concept

Date

1987-5

Author

Can, Fazlı
Özkarahan, Esen A.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

194
views

0
downloads

Indexing in information retrieval (IR) is used to obtain a suitable vocabulary of index terms and optimum assignment of these terms to documents for increasing the effectiveness and efficiency of an IR system. The concept of term discrimination value (TDV) is one of the criteria used for index‐term selection. In this article a new concept called the cover coefficient (CC) will be used in computing TDVs. After a brief introduction to the theory of indexing and the CC concept, an efficient way of computing TDVs by use of the CC concept, index‐term selection, and weight modification are discussed. It is also shown that the computational cost of the CC approach in the calculation of TDVs is favorably comparable to the cost of a different approach that uses similarity coefficients. Furthermore, the TDVs obtained by the CC approach are consistent with those of the latter approach. © 1987 John Wiley & Sons, Inc.

Subject Keywords

General Engineering, Computer Science, Information Systems, Information Science and Library Science

URI

https://hdl.handle.net/11511/52178

Journal

Journal of the American Society for Information Science

DOI

https://doi.org/10.1002/(sici)1097-4571(198705)38:3<171::aid-asi6>3.0.co;2-s

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

Error exponents for variable-length block codes with feedback and cost constraints Nakiboğlu, Barış (Institute of Electrical and Electronics Engineers (IEEE), 2008-03-01) Variable-length block-coding schemes are investigated for discrete memoryless channels with ideal feedback under cost constraints. Upper and lower bounds are found for the minimum achievable probability of decoding error P-e,P-min as a function of constraints R, P, and T on the transmission rate, average cost, and average block length, respectively. For given R and P, the lower and upper bounds to the exponent -(In P-e,P-min)/(T) over bar are asymptotically equal as (T) over bar -> infinity. The resulting r...
Sampling of the Wiener Process for Remote Estimation Over a Channel With Random Delay Sun, Yin; Polyanskiy, Yury; Uysal, Elif (Institute of Electrical and Electronics Engineers (IEEE), 2020-02-01) In this paper, we consider a problem of sampling a Wiener process, with samples forwarded to a remote estimator over a channel that is modeled as a queue. The estimator reconstructs an estimate of the real-time signal value from causally received samples. We study the optimal online sampling strategy that minimizes the mean square estimation error subject to a sampling rate constraint. We prove that the optimal sampling strategy is a threshold policy, and find the optimal threshold. This threshold is determ...
Numerical study on effects of computational domain length on flow field in standing wave thermoacoustic couple MERGEN, SÜHAN; Yıldırım, Ender; TÜRKOĞLU, HAŞMET (Elsevier BV, 2019-03-01) For the analysis of thermoacoustic (TA) devices, computational methods are commonly used. In the computational studies found in the literature, the flow domain has been modelled differently by different researchers. A common approach in modelling the flow domain is to truncate the computational domain around the stack, instead of modelling the whole resonator to save computational time. However, where to truncate the domain is not clear. In this study, we have investigated how the simulation results are aff...
Optimum design and operation of 'a pump-piping-storage system' Kaplan, H; Seireg, A; Dölen, Melik (Inderscience Publishers, 2001-01-01) The study reported in this paper is undertaken to develop a computer simulation and an optimum design and operation strategy for a general storage system. The influence of various design parameters on the total operation cost of the system for a general delivery regime is also studied.
On-demand conversation customization for services in large smart environments Elgedawy, I. (IBM, 2011-01-01) Services in large smart environments, as defined in this paper, are "aware" of their users' contexts and goals and are able to automatically interact with one another in order to achieve these goals. Unfortunately, interactions between services (i.e., service conversations) are not necessarily compatible, as services could have different interfaces (i.e., signature incompatibilities), as well as different logic for message ordering (i.e., protocol incompatibilities). Such conversation incompatibilities crea...

Citation Formats

F. Can and E. A. Özkarahan, “Computation of term/document discrimination values by use of the cover coefficient concept,” Journal of the American Society for Information Science, pp. 171–183, 1987, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52178.