Search results

1 – 10 of 41
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 13 November 2009

Teresa Orlowska‐Kowalska and Joanna Lis

The purpose of this paper is to obtain a preliminary off‐line identification of induction motor (IM) parameters at standstill in a reasonable calculation time, which will be…

225

Abstract

Purpose

The purpose of this paper is to obtain a preliminary off‐line identification of induction motor (IM) parameters at standstill in a reasonable calculation time, which will be useful for the initial adjustment of controllers and state observer parameters in the sensorless drive system.

Design/methodology/approach

The identification procedure of electrical parameters of IM equivalent circuit is performed at standstill and is based on the reconstruction of the stator current response to the forced stator voltage using evolutionary algorithms (EAs) with hard selection and different mutation schemes.

Findings

It is shown that an application of the EA with adaptive mutation mechanism based on simulated annealing method gives very good accuracy of parameters identification and the shortest execution time of the identification procedure as well in simulation as in the experimental tests.

Research limitations/implications

The investigation looks mainly at the minimization of the execution time of the identification algorithm and on the identification accuracy performance, taking into account the good approximation of the measured stator current response.

Practical implications

The proposed EA with the improved adaptive mutation scheme can be easily realised using modern digital signal processor (DSP), which is usually applied for control purposes of the sensorless IM drive system with vector control. The implementation is tested in experimental setup with floating point DSP used as the system controller.

Originality/value

The application of adaptive mutation with simulated annealing in the EA with hard selection for the fast, off‐line preliminary identification of the IM parameter at standstill.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 28 no. 6
Type: Research Article
ISSN: 0332-1649

Keywords

Access Restricted. View access options
Article
Publication date: 1 January 2006

Teresa Orlowska‐Kowalska, Joanna Lis and Krzysztof Szabat

The paper sets out to deal with the off‐line identification of induction motor (IM) parameters at standstill. Determination of values of the IM parameters is essential in…

797

Abstract

Purpose

The paper sets out to deal with the off‐line identification of induction motor (IM) parameters at standstill. Determination of values of the IM parameters is essential in sensorless drives with regard to accuracy and quality of the control system.

Design/methodology/approach

The presented identification method is based on the reconstruction of stator current response to the forced stator voltage step change; thus the cost function is defined in the classical form of the mean squared error between the computed and experimental data. The identification via evolutionary algorithms (EAs) is presented. The considered problem is continuous and thus a continuous version of EA is suggested as more suitable.

Findings

This approach has been shown to have several advantages over classical optimisation methods like the ability to cope with ill‐behaved problem domains exhibiting attributes such as: discontinuity, time‐variance, randomness, and, what is particularly important in this application, the ability to cope with the signals disturbed by noises. Owing to this ability the EAs could be implemented directly for the identification of IM parameters not only in simulations but also in the industrial applications for the motor control, though the electrical signals acquired from real motor and used as input data in the identification procedures are to a large extent disturbed by the electrical noises.

Originality/value

Two versions of the suggested approach are compared: the EA with hard selection and with soft selection. Both algorithms were tested in a simulation and experimental set‐up using digital signal processor for control and signal processing of the voltage inverter‐fed IM drive. Satisfactory results were obtained for the identification procedure based on the selected EA.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 25 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Access Restricted. View access options
Article
Publication date: 31 May 2019

Muhammad Yousuf Ali and Joanna Richardson

The purpose of this study is to analyze the use of Google Scholar Citations’ profiling platform by library and information science (LIS) scholars in Pakistan.

381

Abstract

Purpose

The purpose of this study is to analyze the use of Google Scholar Citations’ profiling platform by library and information science (LIS) scholars in Pakistan.

Design/methodology/approach

Purposive sampling was used to collect Google Scholar Citations profiles between 15 November 2017 and 31 January 2018. Resultant data were analyzed in SPSS Version 21.

Findings

In terms of demographical data, the study results were consistent with previous studies of Pakistani LIS scholars. There were strong correlations between Google Scholar Citations metrics (publications, citations, h-index and i10-index). The results indicate that, compared with a 2011 survey of LIS academics in Pakistan, the overall uptake for this cohort remains relatively low. This cohort is not maximizing the opportunity provided by this specific online profiling system to increase research visibility.

Research limitations/implications

As the study was limited to those Pakistani LIS scholars who already had a profile on ResearchGate, it would be useful to broaden the research to encompass all Pakistani LIS scholars.

Practical implications

The role of the librarian as an adviser in scholarly communication and impact can be extended to support scholars in the adoption of new online platforms for scholarly communication and visibility.

Originality/value

There have been no published research studies on Google Scholar Citations metrics in the context of Pakistani LIS scholars as a whole.

Details

Global Knowledge, Memory and Communication, vol. 68 no. 4/5
Type: Research Article
ISSN: 2514-9342

Keywords

Access Restricted. View access options
Article
Publication date: 4 July 2017

Muhammad Yousuf Ali and Joanna Richardson

The purpose of this paper is to analyse the research performance of Pakistani library and information science (LIS) scholars, using the altmetrics provided by ResearchGate (RG).

745

Abstract

Purpose

The purpose of this paper is to analyse the research performance of Pakistani library and information science (LIS) scholars, using the altmetrics provided by ResearchGate (RG).

Design/methodology/approach

Purposive sampling was used to collect profiles between 15 January 2015 and 30 April 2016 of all members of RG who had self-identified as being an LIS scholar of Pakistani nationality. Additional demographic data were obtained through a small survey administered via Google Docs. Resultant data were analysed in SPSS Version 21.

Findings

Study results were broadly consistent in terms of demographical data with previous studies of this cohort. There was a positive correlation between publications, reads, and citations for scholars who had recorded at least one publication. The majority of publications had not been published in a high impact factor journal. Academic networking site profiles create the potential for collaboration, building connections, and exchanging information.

Research limitations/implications

Some scholars eliminated from this study may have published at least one output but neglected to upload details to RG. It is a purposive, exploratory study that provides insights into future research.

Practical implications

The paper produces findings of relevance to researchers in other countries and/or disciplines who may wish to conduct a similar study of a defined cohort.

Originality/value

There have been no previous published research studies on altmetrics associated with Pakistani LIS scholars.

Details

Program, vol. 51 no. 2
Type: Research Article
ISSN: 0033-0337

Keywords

Access Restricted. View access options
Article
Publication date: 29 August 2018

Muhammad Yousuf Ali and Joanna Richardson

The purpose of this study is to investigate the level of information literacy (IL) skills competency among university library professionals in Karachi, Pakistan and to address…

895

Abstract

Purpose

The purpose of this study is to investigate the level of information literacy (IL) skills competency among university library professionals in Karachi, Pakistan and to address areas of concern.

Design/methodology/approach

An online survey was designed, using Google Forms, to collect data from 77 academic librarians working in 25 universities in Karachi, Pakistan. The questions covered six generic attributes: library systems, information resources, searching techniques, research support, IL and generic/personal attributes.

Findings

The results indicate that the librarians who were surveyed had good IL skills in information searching and locating information resources. However, the average of all survey responses was 54.17 per cent, with 12 of the 24 competencies receiving scores of less than 50 per cent, thus indicating a generally overall low level of IL competency in the workplace.

Research limitations/implications

As the study was limited to universities in Karachi, it would be useful to apply the same methodology to other administrative units within the country. Further research is indicated on the potential impact of gender on aspects such as level of IL skills and motivation to enhance workplace competencies.

Practical implications

The authors have suggested a number of strategies, which would be applicable globally to any university library wishing to improve the IL skills competencies of its staff.

Originality/value

There have been no previous published, non-discipline-specific, research studies on the IL skills competencies of academic librarians in Pakistan.

Details

Information and Learning Science, vol. 119 no. 7/8
Type: Research Article
ISSN: 2398-5348

Keywords

Access Restricted. View access options
Article
Publication date: 27 November 2024

Abid Hussain and Joanna Richardson

The purpose of this study is to measure the current levels of awareness of communication skills among academic librarians in degree-awarding institutions of Pakistan and to…

33

Abstract

Purpose

The purpose of this study is to measure the current levels of awareness of communication skills among academic librarians in degree-awarding institutions of Pakistan and to identify barriers that libraries, with the support of organizational stakeholders, could target to enhance adoption and / or improvement of these skills.

Design/methodology/approach

Quantitative research design, based on a Web-based survey method, used a questionnaire as the data collection tool for librarians used in degree-awarding institutions in Pakistan. After incorporating feedback from experts in the field, the questionnaire link was shared with a sample population of n = 400 academic librarians in Pakistan, using simple random sampling. The data was coded in Microsoft Excel and exported to SPSS v 26 for analysis.

Findings

Overall, the findings underscore a consistent and moderate to high level of awareness by this cohort of basic library communication skills and their associated benefits. The level of agreement as to the principal barriers to these skills aligns with previous research results over the past decade and therefore underlines the need to prioritize the development of appropriate solutions.

Research limitations/implications

Further research is indicated to investigate the major factors contributing to the principal barriers identified in the current study.

Practical implications

The study recommends that librarians work with relevant stakeholders to identify strategies to enhance their personal and interpersonal communication skills and to address current barriers to upskilling.

Originality/value

The study could serve as a foundation for any future research and policy frameworks to enhance employability and communication skills among librarians in Pakistan.

Details

Global Knowledge, Memory and Communication, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2514-9342

Keywords

Access Restricted. View access options
Article
Publication date: 31 August 2021

Tessa Withorn, Jillian Eslami, Hannah Lee, Maggie Clarke, Carolyn Caffrey, Cristina Springfield, Dana Ospina, Anthony Andora, Amalia Castañeda, Alexandra Mitchell, Joanna Messer Kimmitt, Wendolyn Vermeer and Aric Haas

This paper presents recently published resources on library instruction and information literacy, providing an introductory overview and a selected annotated bibliography of…

6469

Abstract

Purpose

This paper presents recently published resources on library instruction and information literacy, providing an introductory overview and a selected annotated bibliography of publications covering various library types, study populations and research contexts.

Design/methodology/approach

This paper introduces and annotates English-language periodical articles, monographs, dissertations, reports and other materials on library instruction and information literacy published in 2020.

Findings

The paper provides a brief description of all 440 sources and highlights sources that contain unique or significant scholarly contributions.

Originality/value

The information may be used by librarians, researchers and anyone interested in a quick and comprehensive reference to literature on library instruction and information literacy.

Details

Reference Services Review, vol. 49 no. 3/4
Type: Research Article
ISSN: 0090-7324

Keywords

Access Restricted. View access options
Article
Publication date: 11 October 2020

Tessa Withorn, Joanna Messer Kimmitt, Carolyn Caffrey, Anthony Andora, Cristina Springfield, Dana Ospina, Maggie Clarke, George Martinez, Amalia Castañeda, Aric Haas and Wendolyn Vermeer

This paper aims to present recently published resources on library instruction and information literacy, providing an introductory overview and a selected annotated bibliography…

8925

Abstract

Purpose

This paper aims to present recently published resources on library instruction and information literacy, providing an introductory overview and a selected annotated bibliography of publications covering various library types, study populations and research contexts.

Design/methodology/approach

This paper introduces and annotates English-language periodical articles, monographs, dissertations, reports and other materials on library instruction and information literacy published in 2019.

Findings

The paper provides a brief description of all 370 sources and highlights sources that contain unique or significant scholarly contributions.

Originality/value

The information may be used by librarians, researchers and anyone interested as a quick and comprehensive reference to literature on library instruction and information literacy.

Details

Reference Services Review, vol. 48 no. 4
Type: Research Article
ISSN: 0090-7324

Keywords

Access Restricted. View access options
Article
Publication date: 5 April 2021

Syeda Hina Batool, Ata ur Rehman and Imran Sulehri

The present study focused on information literacy education through a unique research lens, i.e. the Delphi process in developing countries. The primary aim of the study is to…

764

Abstract

Purpose

The present study focused on information literacy education through a unique research lens, i.e. the Delphi process in developing countries. The primary aim of the study is to formulate an information literacy framework for higher education.

Design/methodology/approach

In total 13 experts from the field, including academicians and practitioners, were invited to build consensus on the components of an information literacy curriculum for library and information sciences or management postgraduate students.

Findings

The Delphi process was completed in three reasonable rounds to build consensus on eight information literacy course units, including computer, research, critical, information, domain-specific knowledge and copyright literacies in line with learning and communication skills. The panelists considered computer, research and critical literacies as the most significant components of an information literacy curriculum for postgraduates.

Practical implications

The proposed framework of information literacy curriculum may have considerable implications for educators, practitioners and researchers.

Originality/value

The study is unique as it focuses on developing a contextual and comprehensive information literacy education framework for information professionals.

Details

Library Hi Tech, vol. 40 no. 6
Type: Research Article
ISSN: 0737-8831

Keywords

Access Restricted. View access options
Article
Publication date: 2 October 2019

Tessa Withorn, Carolyn Caffrey, Joanna Messer Kimmitt, Jillian Eslami, Anthony Andora, Maggie Clarke, Nicole Patch, Karla Salinas Guajardo and Syann Lunsford

This paper aims to present recently published resources on library instruction and information literacy providing an introductory overview and a selected annotated bibliography of…

6758

Abstract

Purpose

This paper aims to present recently published resources on library instruction and information literacy providing an introductory overview and a selected annotated bibliography of publications covering all library types.

Design/methodology/approach

This paper introduces and annotates English-language periodical articles, monographs, dissertations, reports and other materials on library instruction and information literacy published in 2018.

Findings

The paper provides a brief description of all 422 sources, and highlights sources that contain unique or significant scholarly contributions.

Originality/value

The information may be used by librarians and anyone interested as a quick reference to literature on library instruction and information literacy.

Details

Reference Services Review, vol. 47 no. 4
Type: Research Article
ISSN: 0090-7324

Keywords

1 – 10 of 41
Per page
102050