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Article
Publication date: 4 November 2019

A novel hybrid control approach for modular automation system: a case study of sensorless interior permanent magnet in-wheel motor

Yong Li, Yanjun Huang and Xing Xu

Sensorless interior permanent magnet in-wheel motor (IPMIWM), as an exemplar of modular automation system, has attracted considerable interests in recent years. This paper…

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Abstract

Purpose

Sensorless interior permanent magnet in-wheel motor (IPMIWM), as an exemplar of modular automation system, has attracted considerable interests in recent years. This paper aims to investigate a novel hybrid control approach for the sensorless IPMIWM from a cyber-physical systems (CPS) perspective.

Design/methodology/approach

The control approach is presented based on the hybrid dynamical theory. In the standstill-low (S-L) speed, the rotor position/speed signal is estimated by the method of the high frequency (HF) voltage signal injection. The least square support vector machine (LS-SVM) is used to acquire the rotor position/speed signal in medium-high (M-H) speed operation. Hybrid automata model of the IPMIWM is established due to its hybrid dynamic characteristics in wide speed range. A hybrid state observer (HSO), including a discrete state observer (DSO) and a continuous state observer (CSO), is designed for rotor position/speed estimation of the IPMIWM.

Findings

The hardware-in-the-loop testing based on dSPACE is carried out on the test bench. Experimental investigations demonstrate the hybrid control approach can not only identify the rotor position/speed signal with a certain load but also be able to reject the load disturbance. The reliability and the effectiveness of the proposed hybrid control approach were verified.

Originality/value

The proposed hybrid control approach for the sensorless IPMIWM promotes the deep combination and coordination of sensorless IPMIWM drive system. It also theoretically supports and extends the development of the hybrid control of the highly integrated modular automation system.

Details

Assembly Automation, vol. 39 no. 5
Type: Research Article
DOI: https://doi.org/10.1108/AA-08-2018-0120
ISSN: 0144-5154

Keywords

  • Sensorless control
  • Cyber-physical systems
  • Hybrid dynamical system
  • Interior permanent magnet in-wheel motor
  • Modular automation system

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Article
Publication date: 23 June 2020

Social facilitation or social loafing – threshold effect of group size on customer's complaint intention

Xing'an Xu, Lilei Wang and Luqi Wang

The purpose of this paper is to examine the threshold effect of group size on customer's complaining intention under group service failures.

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Abstract

Purpose

The purpose of this paper is to examine the threshold effect of group size on customer's complaining intention under group service failures.

Design/methodology/approach

Based on two main laboratory experiments, through two 10×2 scenario simulation experiments, the authors examine the role of group size in customer's complaining intention.

Findings

Results show that: (1) the relationship between group size and customer's complaining intention follows an inverted “U” type trend; (2) evaluation apprehension mediates the relationship between group size and customer's complaining intention; (3) relational distance can change threshold values and (4) relational distance moderates the relationship between group size and customer's complaining intention.

Practical implications

Managers should judge the threshold of group size through experience so as to have a preliminary understanding of customer evaluation concerns and complaint intention. In the face of service failure groups smaller than the threshold range, managers should divided the group into several small groups. For service failure groups larger than the threshold range, the opinion leaders in the group should be given more attention, so as to control the whole group.

Social implications

This paper is helpful to deeply understand the key role of group size in the process of customer complaints, and also provides decision-making basis for service enterprises to deal with group customer complaints.

Originality/value

There has been little research about the threshold effect of group size on customer's complaining intention. The previous studies on customer's complaining intention focus on its influences on group size, and draw a single common conclusion that the customer's intention to complain will increase with the growing number of groups increases. However, few studies are explored on the threshold of group size. Therefore, this paper will focus on the threshold effect of group size on customer's complaining intention to fill the gap.

Details

Journal of Contemporary Marketing Science, vol. 3 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/JCMARS-12-2019-0049
ISSN: 2516-7480

Keywords

  • Social facilitation
  • Social loafing
  • Group size
  • Complaining intention

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Article
Publication date: 2 January 2020

Dufour and Soret effects on Darcy-Forchheimer flow of second-grade fluid with the variable magnetic field and thermal conductivity

Ambreen A. Khan, S. Naeem, R. Ellahi, Sadiq M. Sait and K. Vafai

This study aims to investigate the effect of two-dimensional Darcy-Forchheimer flow over second-grade fluid with linear stretching. Heat transfer through convective…

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Abstract

Purpose

This study aims to investigate the effect of two-dimensional Darcy-Forchheimer flow over second-grade fluid with linear stretching. Heat transfer through convective boundary conditions is taken into account.

Design/methodology/approach

Nonlinear coupled governing equations are tackled with a homotopy algorithm, while for numerical computation the computer software package BVPh 2.0 is used. The convergence analysis is also presented for the validation of analytical and numerical results.

Findings

Valuation for the impact of key parameters such as variable thermal conductivity, Dufour and Soret effects and variable magnetic field in an electrically conducted fluid on the velocity, concentration and temperature profiles are graphically illustrated. It is observed from the results that temperature distribution rises by Dufour number whereas concentration distribution rises by Soret number. The Forchheimer number and porosity parameter raise the skin friction coefficient. The permeable medium has a vital impact and can help in reining the rate of heat transfer.

Practical implications

The permeable medium has a vital impact and can help in reining the rate of heat transfer.

Originality/value

To the best of the authors’ knowledge, this study is reported for the first time.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 9
Type: Research Article
DOI: https://doi.org/10.1108/HFF-11-2019-0837
ISSN: 0961-5539

Keywords

  • Magnetic field
  • Second-grade fluid
  • Dufour and Soret effects
  • Stretching sheet
  • Darcy-Forchheimer
  • Software package BVPh 2.0
  • Blend of analytical and numerical results

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Article
Publication date: 28 June 2013

Resource‐sharing and genealogical research on Islamic Chinese names in Guilin

Sheau‐yueh J. Chao

The purpose of this paper is to provide the historical background of genealogical records and analyze the value of Chinese genealogical research through the study of names…

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Abstract

Purpose

The purpose of this paper is to provide the historical background of genealogical records and analyze the value of Chinese genealogical research through the study of names and genealogical resources.

Design/methodology/approach

The paper examines the historical evolution and value of Chinese genealogical records, with the focus on researching the Islamic Chinese names used by the people living in Guilin. The highlight of this paper includes the analysis and evolution of the Islamic Chinese names commonly adopted by the local people in Guilin. It concludes with the recommendations on emphasizing and making the best use of genealogical records to enhance the research value of Chinese overseas studies.

Findings

The paper covers the history of Islam and describes how the religion was introduced into China, as well as Muslims' ethnicity and identity. It also places focus on the importance of building a research collection in Asian history and Chinese genealogy.

Research limitations/implications

This research study has a strong subject focus on Chinese genealogy, Asian history, and Islamic Chinese surnames. It is a narrow field that few researchers have delved into.

Practical implications

The results of this study will assist students, researchers, and the general public in tracing the origin of their surnames and developing their interest in the social and historical value of Chinese local history and genealogies.

Social implications

The study of Chinese surnames is, by itself, a particular field for researching the social and political implications of contemporary Chinese society during the time the family members lived.

Originality/value

Very little research has been done in the area of Chinese local history and genealogy. The paper would be of value to researchers such as historians, sociologists, ethnologists and archaeologists, as well as students and anyone interested in researching a surname origin, its history and evolution.

Details

Collection Building, vol. 32 no. 3
Type: Research Article
DOI: https://doi.org/10.1108/CB:03-2013-0009
ISSN: 0160-4953

Keywords

  • China
  • Local history
  • Genealogy
  • Islam
  • History
  • Records management
  • Chinese genealogy
  • Islamic Chinese names
  • Jiapu
  • Guilin (Guangxi Province)
  • Resource‐sharing
  • Overseas Chinese studies

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Article
Publication date: 3 April 2018

A survey on mining stack overflow: question and answering (Q&A) community

Arshad Ahmad, Chong Feng, Shi Ge and Abdallah Yousif

Software developers extensively use stack overflow (SO) for knowledge sharing on software development. Thus, software engineering researchers have started mining the…

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Abstract

Purpose

Software developers extensively use stack overflow (SO) for knowledge sharing on software development. Thus, software engineering researchers have started mining the structured/unstructured data present in certain software repositories including the Q&A software developer community SO, with the aim to improve software development. The purpose of this paper is show that how academics/practitioners can get benefit from the valuable user-generated content shared on various online social networks, specifically from Q&A community SO for software development.

Design/methodology/approach

A comprehensive literature review was conducted and 166 research papers on SO were categorized about software development from the inception of SO till June 2016.

Findings

Most of the studies revolve around a limited number of software development tasks; approximately 70 percent of the papers used millions of posts data, applied basic machine learning methods, and conducted investigations semi-automatically and quantitative studies. Thus, future research should focus on the overcoming existing identified challenges and gaps.

Practical implications

The work on SO is classified into two main categories; “SO design and usage” and “SO content applications.” These categories not only give insights to Q&A forum providers about the shortcomings in design and usage of such forums but also provide ways to overcome them in future. It also enables software developers to exploit such forums for the identified under-utilized tasks of software development.

Originality/value

The study is the first of its kind to explore the work on SO about software development and makes an original contribution by presenting a comprehensive review, design/usage shortcomings of Q&A sites, and future research challenges.

Details

Data Technologies and Applications, vol. 52 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/DTA-07-2017-0054
ISSN: 2514-9288

Keywords

  • Mining
  • Software development
  • Information retrieval
  • Text mining
  • Software repositories
  • Stack overflow

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Book part
Publication date: 29 January 2015

A Biological Basis for the Gender Wage Gap: Fecundity and Age and Educational Hypogamy☆

Part of this paper was written while Solomon W. Polachek was a visiting scholar at the NBER in Cambridge, MA. We thank Vikesh Amin, Talia Bar, Erling Barth, Fran Blau, Richard Burkhauser, Henry Farber, Dan Feenberg, Richard Freeman, Claudia Goldin, David Hacker, Larry Kahn, Subal Kumbhakar, Shelly Lundberg, Haim Ofek, Thomas Rawski, Susan Wolcott, Dennis Yang, Xi Yang, seminar participants at Cornell University, IZA, Kasetsart University (Thailand), Rutgers University, SUNY-Albany, and SUNY-Buffalo, as well as Kostas Tatsiramos and two anonymous referees for valuable comments and suggestions.

Solomon W. Polachek, Xu Zhang and Xing Zhou

This paper shows how a shorter fecundity horizon for females (a biological constraint) leads to age and educational disparities between husbands and wives. Empirical…

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Abstract

This paper shows how a shorter fecundity horizon for females (a biological constraint) leads to age and educational disparities between husbands and wives. Empirical support is based on data from a natural experiment commencing before and ending after China’s 1980 one-child law. The results indicate that fertility in China declined by about 1.2–1.4 births per woman as a result of China’s anti-natalist policies. Concomitantly spousal age and educational differences narrowed by approximately 0.5–1.0 and 1.0–1.6 years, respectively. These decreases in the typical husband’s age and educational advantages are important in explaining the division of labor in the home, often given as a cause for the gender wage gap. Indeed, as fertility declined, which has been the historical trend in most developed countries, husband-wife age and educational differences diminished leading to less division of labor in the home and a smaller gender wage disparity. Unlike other models of division of labor in the home which rely on innately endogenous factors, this paper’s theory is based on an exogenous biological constraint.

Details

Gender Convergence in the Labor Market
Type: Book
DOI: https://doi.org/10.1108/S0147-912120140000041009
ISBN: 978-1-78441-456-6

Keywords

  • Gender wage gap
  • marriage
  • husband-wife age
  • and educational gaps
  • homogamy
  • division of labor in the home
  • household economics
  • J1
  • J2
  • J3
  • J43
  • J7
  • J8
  • N3
  • N9
  • O5
  • Y8
  • Z13

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Book part
Publication date: 27 August 2014

Pesticides and Health: A Review of Evidence on Health Effects, Valuation of Risks, and Benefit-Cost Analysis

Damian Tago, Henrik Andersson and Nicolas Treich

This study contributes to the understanding of the health effects of pesticides exposure and of how pesticides have been and should be regulated.

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Abstract

Purpose

This study contributes to the understanding of the health effects of pesticides exposure and of how pesticides have been and should be regulated.

Design/methodology/approach

This study presents literature reviews for the period 2000–2013 on (i) the health effects of pesticides and on (ii) preference valuation of health risks related to pesticides, as well as a discussion of the role of benefit-cost analysis applied to pesticide regulatory measures.

Findings

This study indicates that the health literature has focused on individuals with direct exposure to pesticides, i.e. farmers, while the literature on preference valuation has focused on those with indirect exposure, i.e. consumers. The discussion highlights the need to clarify the rationale for regulating pesticides, the role of risk perceptions in benefit-cost analysis, and the importance of inter-disciplinary research in this area.

Originality/value

This study relates findings of different disciplines (health, economics, public policy) regarding pesticides, and identifies gaps for future research.

Details

Preference Measurement in Health
Type: Book
DOI: https://doi.org/10.1108/S0731-219920140000024006
ISBN: 978-1-78441-029-2

Keywords

  • Benefit-cost analysis
  • health
  • pesticides
  • willingness to pay

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Article
Publication date: 2 December 2019

Numerical study of unsteady flow and heat transfer CNT-based MHD nanofluid with variable viscosity over a permeable shrinking surface

Zahid Ahmed, Sohail Nadeem, Salman Saleem and Rahmat Ellahi

The purpose of this paper is to present a novel model on the unsteady MHD flow of heat transfer in carbon nanotubes with variable viscosity over a shrinking surface.

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Abstract

Purpose

The purpose of this paper is to present a novel model on the unsteady MHD flow of heat transfer in carbon nanotubes with variable viscosity over a shrinking surface.

Design/methodology/approach

The temperature-dependent viscosity makes the proposed model non-linear and coupled. Consequently, the resulting non-linear partial differential equations are first reformed into set of ordinary differential equations through appropriate transformations and boundary layer approximation and are then solved numerically by the Keller box method.

Findings

Graphical and numerical results are executed keeping temperature-dependent viscosity of nanofluid. It is noted that, for diverse critical points, it is found that at one side of these critical values, multiple solutions exist; on the other side, no solution exists. A comparison is also computed for the special case of existing study. The temperature and pressure profiles are also plotted for various effective parameters.

Originality/value

The work is original.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 29 no. 12
Type: Research Article
DOI: https://doi.org/10.1108/HFF-04-2019-0346
ISSN: 0961-5539

Keywords

  • Nanofluids
  • MHD
  • Variable viscosity
  • Shrinking sheet
  • Keller box method
  • Carbon nanotubes
  • MHD flow

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Article
Publication date: 1 April 2001

Dances with wolves? China’s integration into digital capitalism

Yuezhi Zhao and Dan Schiller

Wonders whether, owing to severely restricted access, China’s government policy towards digital communications will remain in a constant state of flux – or will it gain…

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Abstract

Wonders whether, owing to severely restricted access, China’s government policy towards digital communications will remain in a constant state of flux – or will it gain economic benefits without a social penalty? Concludes that China has to link the forces of change to channel and deflect domestic resistance.

Details

info, vol. 3 no. 2
Type: Research Article
DOI: https://doi.org/10.1108/14636690110801879
ISSN: 1463-6697

Keywords

  • Telecommunications
  • China
  • Access control

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Article
Publication date: 9 February 2015

Trends in knowledge modelling and knowledge management: an editorial

Biswanath Dutta and Devika P. Madalli

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Abstract

Details

Journal of Knowledge Management, vol. 19 no. 1
Type: Research Article
DOI: https://doi.org/10.1108/JKM-10-2014-0442
ISSN: 1367-3270

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