Search results

1 – 10 of over 268000
Article
Publication date: 9 November 2015

Mari Vállez, Rafael Pedraza-Jiménez, Lluís Codina, Saúl Blanco and Cristòfol Rovira

Controlled vocabularies play an important role in information retrieval. Numerous studies have shown that conceptual searches based on vocabularies are more effective than…

1588

Abstract

Purpose

Controlled vocabularies play an important role in information retrieval. Numerous studies have shown that conceptual searches based on vocabularies are more effective than keyword searches, at least in certain contexts. Consequently, new ways must be found to improve controlled vocabularies. The purpose of this paper is to present a semi-automatic model for updating controlled vocabularies through the use of a text corpus and the analysis of query logs.

Design/methodology/approach

An experimental development is presented in which, first, the suitability of a controlled vocabulary to a text corpus is examined. The keywords entered by users to access the text corpus are then compared with the descriptors used to index it. Finally, both the query logs and text corpus are processed to obtain a set of candidate terms to update the controlled vocabulary.

Findings

This paper describes a model applicable both in the context of the text corpus of an online academic journal and to repositories and intranets. The model is able to: first, identify the queries that led users from a search engine to a relevant document; and second, process these queries to identify candidate terms for inclusion in a controlled vocabulary.

Research limitations/implications

Ideally, the model should be used in controlled web environments, such as repositories, intranets or academic journals.

Social implications

The proposed model directly improves the indexing process by facilitating the maintenance and updating of controlled vocabularies. It so doing, it helps to optimise access to information.

Originality/value

The proposed model takes into account the perspective of users by mining queries in order to propose candidate terms for inclusion in a controlled vocabulary.

Details

Online Information Review, vol. 39 no. 7
Type: Research Article
ISSN: 1468-4527

Keywords

Open Access
Article
Publication date: 30 November 2021

Koraljka Golub, Pawel Michal Ziolkowski and Goran Zlodi

The study aims to paint a representative picture of the current state of search interfaces of Swedish online museum collections, focussing on search functionalities with…

1158

Abstract

Purpose

The study aims to paint a representative picture of the current state of search interfaces of Swedish online museum collections, focussing on search functionalities with particular reference to subject searching, as well as the use of controlled vocabularies, with the purpose of identifying which improvements of the search interfaces are needed to ensure high-quality information retrieval for the end user.

Design/methodology/approach

In the first step, a set of 21 search interface criteria was identified, based on related research and current standards in the domain of cultural heritage knowledge organization. Secondly, a complete set of Swedish museums that provide online access to their collections was identified, comprising nine cross-search services and 91 individual museums' websites. These 100 websites were each evaluated against the 21 criteria, between 1 July and 31 August 2020.

Findings

Although many standards and guidelines are in place to ensure quality-controlled subject indexing, which in turn support information retrieval of relevant resources (as individual or full search results), the study shows that they are not broadly implemented, resulting in information retrieval failures for the end user. The study also demonstrates a strong need for the implementation of controlled vocabularies in these museums.

Originality/value

This study is a rare piece of research which examines subject searching in online museums; the 21 search criteria and their use in the analysis of the complete set of online collections of a country represents a considerable and unique contribution to the fields of knowledge organization and information retrieval of cultural heritage. Its particular value lies in showing how the needs of end users, many of which are documented and reflected in international standards and guidelines, should be taken into account in designing search tools for these museums; especially so in subject searching, which is the most complex and yet the most common type of search. Much effort has been invested into digitizing cultural heritage collections, but access to them is hindered by poor search functionality. This study identifies which are the most important aspects to improve.

Article
Publication date: 1 May 1994

Arthur Lee

What is Controlled English? Its use and application. The rules of Controlled English and their meaning. Max — a Controlled English tool. The Controlled English…

Abstract

What is Controlled English? Its use and application. The rules of Controlled English and their meaning. Max — a Controlled English tool. The Controlled English dictionaries. Implementation of Controlled English within Bull. Guidelines for implementing a Controlled Language system with or without Machine Translation.

Details

Aslib Proceedings, vol. 46 no. 5
Type: Research Article
ISSN: 0001-253X

Article
Publication date: 1 December 2000

Mine Uĝurlu

Documents evidence on the interdependence between the mechanisms used to control the agency costs in Turkish manufacturing firms where the external control devices are…

1675

Abstract

Documents evidence on the interdependence between the mechanisms used to control the agency costs in Turkish manufacturing firms where the external control devices are restricted and most of the firms have concentrated ownership. The ownership concentration, board size and composition, managerial shareholdings, institutional shareholdings, and family shareholdings are the selected devices. Evidence reveals that the proportion of insiders on the board is positively related to the percentage of family shareholdings and negatively related to the percentage of foreign institutional shareholdings and ownership concentration. Board size shows a significant negative relation with all the control mechanisms except the debt ratio. The finding that the managerially controlled firms have lower debt ratio than the institutionally controlled firms and the family controlled firms supports the entrenchment hypothesis. The capital market seems to complement the institutional shareholdings, family shareholdings, and ownership concentration in monitoring the CEOs.

Details

Journal of Economic Studies, vol. 27 no. 6
Type: Research Article
ISSN: 0144-3585

Keywords

Article
Publication date: 8 July 2010

Brian Matthews, Catherine Jones, Bartłomiej Puzoń, Jim Moon, Douglas Tudhope, Koraljka Golub and Marianne Lykke Nielsen

Traditional subject indexing and classification are considered infeasible in many digital collections. This paper seeks to investigate ways of enhancing social tagging via…

1934

Abstract

Purpose

Traditional subject indexing and classification are considered infeasible in many digital collections. This paper seeks to investigate ways of enhancing social tagging via knowledge organization systems, with a view to improving the quality of tags for increased information discovery and retrieval performance.

Design/methodology/approach

Enhanced tagging interfaces were developed for exemplar online repositories, and trials were undertaken with author and reader groups to evaluate the effectiveness of tagging augmented with control vocabulary for subject indexing of papers in online repositories.

Findings

The results showed that using a knowledge organisation system to augment tagging does appear to increase the effectiveness of non‐specialist users (that is, without information science training) in subject indexing.

Research limitations/implications

While limited by the size and scope of the trials undertaken, these results do point to the usefulness of a mixed approach in supporting the subject indexing of online resources.

Originality/value

The value of this work is as a guide to future developments in the practical support for resource indexing in online repositories.

Details

Aslib Proceedings, vol. 62 no. 4/5
Type: Research Article
ISSN: 0001-253X

Keywords

Abstract

Details

The Handbook of Road Safety Measures
Type: Book
ISBN: 978-1-84855-250-0

Abstract

Details

The Handbook of Road Safety Measures
Type: Book
ISBN: 978-1-84855-250-0

Article
Publication date: 14 November 2016

Anas N. Al-Rabadi

The purpose of this paper is to introduce new implementations for parallel processing applications using bijective systolic networks and their corresponding carbon-based…

Abstract

Purpose

The purpose of this paper is to introduce new implementations for parallel processing applications using bijective systolic networks and their corresponding carbon-based field emission controlled switching. The developed implementations are performed in the reversible domain to perform the required bijective parallel computing, where the implementations for parallel computations that utilize the presented field-emission controlled switching and their corresponding many-valued (m-ary) extensions for the use in nano systolic networks are introduced. The second part of the paper introduces the implementation of systolic computing using two-to-one controlled switching via carbon-based field emission that were presented in the first part of the paper, and the computational extension to the general case of many-valued (m-ary) systolic networks utilizing many-to-one carbon-based field emission is also introduced.

Design/methodology/approach

The introduced systolic systems utilize recent findings in field emission and nano applications to implement the functionality of the basic bijective systolic network. This includes many-valued systolic computing via field-emission techniques using carbon-based nanotubes and nanotips. The realization of bijective logic circuits in current and emerging technologies can be very important for various reasons. The reduction of power consumption is a major requirement for the circuit design in future technologies, and thus, the new nano systolic circuits can play an important role in the design of circuits that consume minimal power for future applications such as in low-power signal processing. In addition, the implemented bijective systems can be utilized to implement massive parallel processing and thus obtaining very high processing performance, where the implementation will also utilize the significant size reduction within the nano domain. The extensions of implementations to field emission-based many-valued systolic networks using the introduced bijective nano systolic architectures are also presented.

Findings

Novel bijective systolic architectures using nano-based field emission implementations are introduced in this paper, and the implementation using the general scheme of many-valued computing is presented. The carbon-based field emission implementation of nano systolic networks is also introduced. This is accomplished using the introduced field-emission carbon-based devices, where field emission from carbon nanotubes and nano-apex carbon fibers is utilized. The implementations of the many-valued bijective systolic networks utilizing the introduced nano-based architectures are also presented.

Practical implications

The introduced bijective systolic implementations form new important directions in the systolic realizations using the newly emerging nano-based technologies. The 2-to-1 multiplexer is a basic building block in “switch logic,” where in switch logic, a logic circuit is realized as a combination of switches rather than a combination of logic gates as in the gate logic, which proves to be less costly in synthesizing multiplexer-based wide variety of modern circuits and systems since nano implementations exist in very compact space where carbon-based devices switch reliably using much less power than silicon-based devices. The introduced implementations for nano systolic computation are new and interesting for the design in future nanotechnologies that require optimal design specifications of minimum power consumption and minimum size layout such as in low-power control of autonomous robots and in the adiabatic low-power VLSI circuit design for signal processing applications.

Originality/value

The introduced bijective systolic implementations form new important directions in the systolic realizations utilizing the newly emerging nanotechnologies. The introduced implementations for nano systolic computation are new and interesting for the design in future nanotechnologies that require optimal design specifications of high performance, minimum power and minimum size.

Article
Publication date: 8 June 2012

Annalisa Tirella, Carmelo De Maria, Giuseppe Criscenti, Giovanni Vozzi and Arti Ahluwalia

The traditional tissue engineering approach employs rapid prototyping systems to realise microstructures (i.e. scaffolds) which recapitulate the function and organization…

Abstract

Purpose

The traditional tissue engineering approach employs rapid prototyping systems to realise microstructures (i.e. scaffolds) which recapitulate the function and organization of native tissues. The purpose of this paper is to describe a new rapid prototyping system (PAM‐modular micro‐fabrication system, PAM2) able to fabricate microstructures using materials with different properties in a controlled environment.

Design/methodology/approach

Computer‐aided technologies were used to design multi‐scale biological models. Scaffolds with specific features were then designed using custom software and manufactured using suitable modules. In particular, several manufacturing modules were realised to enlarge the PAM2 processing material window, controlling physical parameters such as pressure, force, temperature and light. These modules were integrated in PAM2, allowing a precise control of fabrication parameters through a modular approach and hardware configuration.

Findings

Synthetic and natural polymeric solutions, thermo‐sensitive and photo‐sensitive materials can be used to fabricate 3D scaffolds. Both simple and complex architectures with high fidelity and spatial resolution ranging from ±15 μm to ±200μm (according to ink properties and extrusion module used) were realised.

Originality/value

The PAM2 system is a new rapid prototyping technique which operates in controlled conditions (for example temperature, pressure or light intensity) and integrates several manufacturing modules for the fabrication of complex or multimaterial microstructures. In this paper it is shown how the system can be configured and then used to fabricate scaffolds mimicking the extra‐cellular matrix, both in its properties (i.e. physic‐chemical and mechanical properties) and architecture.

Details

Rapid Prototyping Journal, vol. 18 no. 4
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 1 September 2005

Michelle Dalmau, Randall Floyd, Dazhi Jiao and Jenn Riley

Seeks to share with digital library practitioners the development process of an online image collection that integrates the syndetic structure of a controlled vocabulary…

8337

Abstract

Purpose

Seeks to share with digital library practitioners the development process of an online image collection that integrates the syndetic structure of a controlled vocabulary to improve end‐user search and browse functionality.

Design/methodology/approach

Surveys controlled vocabulary structures and their utility for catalogers and end‐users. Reviews research literature and usability findings that informed the specifications for integration of the controlled vocabulary structure into search and browse functionality. Discusses database functions facilitating query expansion using a controlled vocabulary structure, and web application handling of user queries and results display. Concludes with a discussion of open‐source alternatives and reuse of database and application components in other environments.

Findings

Affirms that structured forms of browse and search can be successfully integrated into digital collections to significantly improve the user's discovery experience. Establishes ways in which the technologies used in implementing enhanced search and browse functionality can be abstracted to work in other digital collection environments.

Originality/value

Significant amounts of research on integrating thesauri structures into search and browse functionalities exist, but examples of online resources that have implemented this approach are few in comparison. The online image collection surveyed in this paper can serve as a model to other designers of digital library resources for integrating controlled vocabularies and metadata structures into more dynamic search and browse functionality for end‐users.

Details

Library Hi Tech, vol. 23 no. 3
Type: Research Article
ISSN: 0737-8831

Keywords

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