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Article
Publication date: 4 July 2016

Erfan Asaadi and P. Stephan Heyns

The purpose of this paper is to propose a progressive inverse identification algorithm to characterize flow stress of tubular materials from the material response…

Abstract

Purpose

The purpose of this paper is to propose a progressive inverse identification algorithm to characterize flow stress of tubular materials from the material response, independent of choosing an a priori hardening constitutive model.

Design/methodology/approach

In contrast to the conventional forward flow stress identification methods, the flow stress is characterized by a multi-linear curve rather than a limited number of hardening model parameters. The proposed algorithm optimizes the slopes and lengths of the curve increments simultaneously. The objective of the optimization is that the finite element (FE) simulation response of the test estimates the material response within a predefined accuracy.

Findings

The authors employ the algorithm to identify flow stress of a 304 stainless steel tube in a tube bulge test as an example to illustrate application of the algorithm. Comparing response of the FE simulation using the obtained flow stress with the material response shows that the method can accurately determine the flow stress of the tube.

Practical implications

The obtained flow stress can be employed for more accurate FE simulation of the metal forming processes as the material behaviour can be characterized in a similar state of stress as the target metal forming process. Moreover, since there is no need for a priori choosing the hardening model, there is no risk for choosing an improper hardening model, which in turn facilitates solving the inverse problem.

Originality/value

The proposed algorithm is more efficient than the conventional inverse flow stress identification methods. In the latter, each attempt to select a more accurate hardening model, if it is available, result in constructing an entirely new inverse problem. However, this problem is avoided in the proposed algorithm.

Details

Engineering Computations, vol. 33 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 7 October 2021

Vadym Mozgovoy

The authors aim to develop a conceptual framework for longitudinal estimation of stress-related states in the wild (IW), based on the machine learning (ML) algorithms that…

Abstract

Purpose

The authors aim to develop a conceptual framework for longitudinal estimation of stress-related states in the wild (IW), based on the machine learning (ML) algorithms that use physiological and non-physiological bio-sensor data.

Design/methodology/approach

The authors propose a conceptual framework for longitudinal estimation of stress-related states consisting of four blocks: (1) identification; (2) validation; (3) measurement and (4) visualization. The authors implement each step of the proposed conceptual framework, using the example of Gaussian mixture model (GMM) and K-means algorithm. These ML algorithms are trained on the data of 18 workers from the public administration sector who wore biometric devices for about two months.

Findings

The authors confirm the convergent validity of a proposed conceptual framework IW. Empirical data analysis suggests that two-cluster models achieve five-fold cross-validation accuracy exceeding 70% in identifying stress. Coefficient of accuracy decreases for three-cluster models achieving around 45%. The authors conclude that identification models may serve to derive longitudinal stress-related measures.

Research limitations/implications

Proposed conceptual framework may guide researchers in creating validated stress-related indicators. At the same time, physiological sensing of stress through identification models is limited because of subject-specific reactions to stressors.

Practical implications

Longitudinal indicators on stress allow estimation of long-term impact coming from external environment on stress-related states. Such stress-related indicators can become an integral part of mobile/web/computer applications supporting stress management programs.

Social implications

Timely identification of excessive stress may improve individual well-being and prevent development stress-related diseases.

Originality/value

The study develops a novel conceptual framework for longitudinal estimation of stress-related states using physiological and non-physiological bio-sensor data, given that scientific knowledge on validated longitudinal indicators of stress is in emergent state.

Details

Applied Computing and Informatics, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2634-1964

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Article
Publication date: 2 June 2021

Dimitra Dritsa and Nimish Biloria

This paper presents a critical review of studies which map the urban environment using continuous physiological data collection. A conceptual model is consequently…

Abstract

Purpose

This paper presents a critical review of studies which map the urban environment using continuous physiological data collection. A conceptual model is consequently presented for mitigating urban stress at the city and the user level.

Design/methodology/approach

The study reviews relevant publications, examining the tools used for data collection and the methods used for data analysis and data fusion. The relationship between urban features and physiological responses is also examined.

Findings

The review showed that the continuous monitoring of physiological data in the urban environment can be used for location-aware stress detection and urban emotion mapping. The combination of physiological and contextual data helps researchers understand how the urban environment affects the human body. The review indicated a relationship between some urban features (green, land use, traffic, isovist parameters) and physiological responses, though more research is needed to solidify the existence of the identified links. The review also identified many theoretical, methodological and practical issues which hinder further research in this area.

Originality/value

While there is large potential in this field, there has been no review of studies which map continuously physiological data in the urban environment. This study covers this gap and introduces a novel conceptual model for mitigating urban stress.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. 15 no. 3
Type: Research Article
ISSN: 2631-6862

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Article
Publication date: 1 January 1993

Marie McHugh

Organizations are being forced to contend with an increasinglydiverse range of influential factors which have implications for theirefficiency and effectiveness. Such…

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1567

Abstract

Organizations are being forced to contend with an increasingly diverse range of influential factors which have implications for their efficiency and effectiveness. Such factors are likely to create a cumulative spiral of pressures for organization members and render them susceptible to the adverse effects of stress. Increased prevalence of work stress among employees, coupled with its harmful effects for the operation of companies, prompted an investigation of managerial attitudes to stress at work in the clothing industry. Structured interviews were carried out with managers from 44 companies. Of the respondents 70.5 per cent believed that employees in their company experienced stress at work. Many identified a range of causes and effects, and 81.4 per cent acknowledged that stress is a problem for individuals and organizations. However, few companies had any mechanisms for identifying and helping stressed employees. Highlights a need for companies to take cognizance of the costs of stress within organizations and to take corrective action.

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Article
Publication date: 1 January 1993

Marie McHugh and Shirley Brennan

Presents evidence on the prevalence of work stress and the apparentreluctance of many to recognize the interdependence of individual andorganizational health. Consequently…

Abstract

Presents evidence on the prevalence of work stress and the apparent reluctance of many to recognize the interdependence of individual and organizational health. Consequently focuses on the urgent need for organizations to engage in stress prevention and stress management activities. Previous approaches to stress prevention and stress management have often appeared to be rather haphazard, so outlines a practical, all encompassing, cost‐saving model which brings the organization towards a philosophy of “total stress management”.

Details

Employee Councelling Today, vol. 5 no. 1
Type: Research Article
ISSN: 0955-8217

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Article
Publication date: 4 February 2014

Haifen Lin and Jingqin Su

This paper aims to address how management practices successfully implemented somewhere else, namely adoptive management innovation, have been introduced into Chinese firms…

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1671

Abstract

Purpose

This paper aims to address how management practices successfully implemented somewhere else, namely adoptive management innovation, have been introduced into Chinese firms and then effectively implemented, or to investigate key activities of the generative mechanism through which an adoptive management innovation occurs.

Design/methodology/approach

Since the purpose of management innovation is to utilize organizational resources more efficiently and further their goals, with little intention to pursue differentiation and without any protection from patent, adoptive management innovation has been prevailing around China and even the whole world. Based on the conception of what makes adoptive management innovation unique, this paper attempts to investigate the case of the Organizational Efficiency Management of Jiangxi Mobile in China to identify key activities of adoptive management innovation and develop a two-interlinked-subprocess framework of adoption decision and implementation, aiming to offer suggestions for firms in adopting new management practices.

Findings

The results indicate that adoption of existing management practices or methods from somewhere else is a more complex and logical process rather than a simple one of knowledge transferring. It needs to integrate existing practices into new organizational context and establish their innovative value during implementation. One core element of the process framework is the emphasis on activities of problem diagnoses and realization of the fitness between management practices adopted and the new organizational context, and another one is the sequence of activities in the whole process.

Research limitations/implications

This research is constrained by at least three limitations. First, the authors' findings for the two-subprocess framework of adoptive management innovation need to be further confirmed for more organizations. Second, little attention has been paid to relative advantages of different sequence of activities. Third, when focusing on adoptive management innovation from a process perspective, this research does not address problems such as why some managers pursue innovative opportunities by introducing new practices, how contextual elements, internal elements, and top management teams affect management innovation, or how the performance of adoptive management innovation could be improved in China.

Originality/value

The findings offer some valuable insights for further research in how to explore the generative mechanism of organizational changes or innovations in China and hold important implications for management practices.

Details

Journal of Organizational Change Management, vol. 27 no. 1
Type: Research Article
ISSN: 0953-4814

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Article
Publication date: 3 August 2015

Kambiz Koohestani

The determination of feasible self-stress modes and grouping of elements for tensegrities with predefined geometry and multiple self-stress modes is very important, though…

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1206

Abstract

Purpose

The determination of feasible self-stress modes and grouping of elements for tensegrities with predefined geometry and multiple self-stress modes is very important, though difficult, in the design of these structures. The purpose of this paper is to present a novel approach to the automated element grouping and self-stress identification of tensegrities.

Design/methodology/approach

A set of feasible solutions conforming to the unilateral behaviour of elements is obtained through an optimisation process, which is solved using a genetic algorithm. Each chromosome in the population having a negative fitness is a distinctive feasible solution with its own grouping characteristic, which is automatically determined throughout the evolution process.

Findings

The self-stress identification is formulated through an unconstrained minimisation problem. The objective function of this minimisation problem is defined in such a way that takes into account both the feasibility of a solution and grouping of elements. The method generates a set of feasible self-stress modes rather than a single one and automatically and simultaneously suggests a grouping of elements for every feasible self-stress mode. A self-stress mode with a minimal/subminimal grouping of elements is also obtained.

Originality/value

The method can efficiently generate sets of feasible solutions rather than a single one. The authors also address one of the challenging issues related to this identification, i.e., automated grouping of elements. These features makes the method very efficient since most of the state-of-the-art methods address the self-stress identification of tensegrities based on predefined groupings of elements whilst providing only a single corresponding solution.

Details

Engineering Computations, vol. 32 no. 6
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 3 November 2020

Laee Choi and Charles A. Lawry

Very few studies have considered how customer participation (CP) influences service employees' well-being. CP may lead employees to engage in emotional labor strategies…

Abstract

Purpose

Very few studies have considered how customer participation (CP) influences service employees' well-being. CP may lead employees to engage in emotional labor strategies (surface/deep acting), which can elevate their job stress. Whereas surface acting involves falsifying emotions, deep acting involves empathizing with others. Therefore, the current article examines how these emotional labor strategies arise from CP and create job stress.

Design/methodology/approach

Study 1 is an online survey of service employees' wellbeing during CP (n = 509). Study 2 compares service employees' responses within hedonic and utilitarian service settings through a scenario-based experiment (n = 440). PROCESS was used to analyze the data in both studies.

Findings

First, study 1 supports that perceived CP increases job stress. Secondly, surface acting mediates the link between CP and job stress, but deep acting does not. Thereafter, Study 2 shows that the link between CP and job stress decreases as employee-customer identification (ECI) increases only during surface acting. Additionally, the impact of surface acting on job stress during CP is greater for hedonic services than utilitarian services, but there is no significant difference for deep acting.

Originality/value

This article contributes an original perspective by comparing models of service employees' responses to CP and job stress in hedonic versus utilitarian settings. Moreover, the intervening effects of ECI and emotional labor strategies on job stress, as demonstrated through these employee-facing models, offer added value to the CRM and co-creation literature.

Details

Journal of Service Theory and Practice, vol. 30 no. 6
Type: Research Article
ISSN: 2055-6225

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Article
Publication date: 1 February 1995

Lawrence R. Murphy

Starts from the premisses that stress at work is a significant andcostly problem, and that the challenge for companies is to manage workstress in order to reduce…

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13708

Abstract

Starts from the premisses that stress at work is a significant and costly problem, and that the challenge for companies is to manage work stress in order to reduce health‐care costs and improve productivity. Suggests that this challenge can be met by greater collaboration among company departments, bringing expertise from different areas to bear on the problem. Describes the conceptual basis for such collaboration and presents a case study of an ongoing partnership between an employee assistance programme and a human resource management group.

Details

Personnel Review, vol. 24 no. 1
Type: Research Article
ISSN: 0048-3486

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Article
Publication date: 8 April 2014

Lorenzo Avanzi, Franco Fraccaroli, Guido Sarchielli, Johannes Ullrich and Rolf van Dick

– The purpose of this paper is to combine social identity and social exchange theories into a model explaining turnover intentions.

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2378

Abstract

Purpose

The purpose of this paper is to combine social identity and social exchange theories into a model explaining turnover intentions.

Design/methodology/approach

Questionnaires measuring the constructs of organizational identification, perceived organizational support, emotional exhaustion, and turnover intentions were completed by 195 employees.

Findings

Results supported our hypotheses: social identification increased the perception of organizational support which in turn reduced emotional exhaustion which was finally related to turnover intentions. Furthermore, social identification moderated the relation between organizational support and turnover intentions.

Research limitations/implications

The study design was cross-sectional and data were collected using self-report with no assessment of objective data.

Practical implications

To reduce turnover, managers should focus on both support and employees’ identification with teams and organizations.

Originality/value

This study combines two theoretical perspectives into an integrative framework and simultaneous moderated-mediation was used to test the model.

Details

International Journal of Productivity and Performance Management, vol. 63 no. 3
Type: Research Article
ISSN: 1741-0401

Keywords

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