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Article

Edilson M. Assis, Ernesto P. Borges, Silvio A.B. Vieira de Melo and Leizer Schnitman

The purpose of this paper is to compare four life data models, namely the exponential and the Weibull models, and their corresponding generalized versions, q-exponential…

Abstract

Purpose

The purpose of this paper is to compare four life data models, namely the exponential and the Weibull models, and their corresponding generalized versions, q-exponential and q-Weibull models, by means of one practical application.

Design/methodology/approach

Application of the models to a practical example (a welding station), with estimation of parameters by the use of the least squares method, and the Akaike Information Criterion (AIC).

Findings

The data of the example considered in this paper is divided into three regimes, decreasing, constant and increasing failure rate, and the q-Weibull model describes the bathtub curve displayed by the data with a single set of parameters.

Practical implications

The simplicity and flexibility of the q-Weibull model may be very useful for practitioners of reliability analysis, and its benefits surpasses the inconvenience of the additional parameter, as AIC shows.

Originality/value

The q-Weibull model is compared in detail with other three models, through the analysis of one example that clearly exhibits a bathtub curve, and it is shown that it can describe the whole time range with a single set of parameters.

Details

International Journal of Quality & Reliability Management, vol. 32 no. 2
Type: Research Article
ISSN: 0265-671X

Keywords

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Article

Edilson M. Assis, Ernesto P. Borges and Silvio A.B. Vieira de Melo

The purpose of this paper is to analyze mathematical aspects of the q‐Weibull model and explore the influence of the parameter q.

Abstract

Purpose

The purpose of this paper is to analyze mathematical aspects of the q‐Weibull model and explore the influence of the parameter q.

Design/methodology/approach

The paper uses analytical developments with graph illustrations and an application to a practical example.

Findings

The q‐Weibull distribution function is able to reproduce the bathtub shape curve for the failure rate function with a single set of parameters. Moments of the distribution are also presented.

Practical implications

The generalized q‐Weibull distribution unifies various possible descriptions for the failure rate function: monotonically decreasing, monotonically increasing, unimodal and U‐shaped (bathtub) curves. It recovers the usual Weibull distribution as a particular case. It represents a unification of models usually found in reliability analysis. Q‐Weibull model has its inspiration in nonextensive statistics, used to describe complex systems with long‐range interactions and/or long‐term memory. This theoretical background may help the understanding of the underlying mechanisms for failure events in engineering problems.

Originality/value

Q‐Weibull model has already been introduced in the literature, but it was not realized that it is able to reproduce a bathtub curve using a unique set of parameters. The paper brings a mapping of the parameters, showing the range of the parameters that should be used for each type of curve.

Details

International Journal of Quality & Reliability Management, vol. 30 no. 7
Type: Research Article
ISSN: 0265-671X

Keywords

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Article

Juan R. Freudenthal

“A knowledge of different literatures is the best way to free one's self from the tyranny of any of them.” Jose Marti, Cuban writer, poet and statesman.

Abstract

“A knowledge of different literatures is the best way to free one's self from the tyranny of any of them.” Jose Marti, Cuban writer, poet and statesman.

Details

Collection Building, vol. 2 no. 1
Type: Research Article
ISSN: 0160-4953

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Book part

Barbara de Lima Voss, David Bernard Carter and Bruno Meirelles Salotti

We present a critical literature review debating Brazilian research on social and environmental accounting (SEA). The aim of this study is to understand the role of…

Abstract

We present a critical literature review debating Brazilian research on social and environmental accounting (SEA). The aim of this study is to understand the role of politics in the construction of hegemonies in SEA research in Brazil. In particular, we examine the role of hegemony in relation to the co-option of SEA literature and sustainability in the Brazilian context by the logic of development for economic growth in emerging economies. The methodological approach adopts a post-structural perspective that reflects Laclau and Mouffe’s discourse theory. The study employs a hermeneutical, rhetorical approach to understand and classify 352 Brazilian research articles on SEA. We employ Brown and Fraser’s (2006) categorizations of SEA literature to help in our analysis: the business case, the stakeholder–accountability approach, and the critical case. We argue that the business case is prominent in Brazilian studies. Second-stage analysis suggests that the major themes under discussion include measurement, consulting, and descriptive approach. We argue that these themes illustrate the degree of influence of the hegemonic politics relevant to emerging economics, as these themes predominantly concern economic growth and a capitalist context. This paper discusses trends and practices in the Brazilian literature on SEA and argues that the focus means that SEA avoids critical debates of the role of capitalist logics in an emerging economy concerning sustainability. We urge the Brazilian academy to understand the implications of its reifying agenda and engage, counter-hegemonically, in a social and political agenda beyond the hegemonic support of a particular set of capitalist interests.

Details

Advances in Environmental Accounting & Management: Social and Environmental Accounting in Brazil
Type: Book
ISBN: 978-1-78635-376-4

Keywords

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Book part

Fábio Henrique Pereira

This chapter examines the professional identities of Brazilian journalists. It does so through an analysis of the growing professional autonomy of journalism from 1950 to…

Abstract

This chapter examines the professional identities of Brazilian journalists. It does so through an analysis of the growing professional autonomy of journalism from 1950 to 1990 through the life stories of 10 intellectual-journalists, individuals whose journalistic activities have crossed over into other intellectual fields.

This study applies a symbolic interactionist framework to understand how these actors managed their reputations and careers within the intellectual world. The narratives were taken from qualitative semi-structured interviews, and supported by additional research such as interviews, biographies, and articles which have been published about their lives.

The life stories were compared to the extensive structural changes affecting the world of journalism and the world of intellectuals in Brazil. This comparison revealed gaps between these two spheres of practice, within which the ambivalent form of journalists’ identities have been constructed.

This chapter offers two contributions to the study of Brazilian journalists. From a theoretical and methodological viewpoint, it advances beyond other studies that focus more on the prevailing representations of journalists’ professional identities and their role in society. From an empirical standpoint, it describes the complex negotiations between the worlds of journalism, culture and politics. This chapter also reexamines the current dominant explanation for the changes in Brazilian journalism. It shows that building careers and new levels of interpersonal cooperation for intellectuals and journalists has been a slow process. Ultimately, this development has left some behind, especially those actors stretched between multiple professional identities such as those who self-identify as intellectual-journalists.

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Article

Erik Ernesto Vazquez

Retail marketers use brand communities (BCs) on social media (SM) to create digital engagement and reach new customers. However, this marketing form needs perceived…

Abstract

Purpose

Retail marketers use brand communities (BCs) on social media (SM) to create digital engagement and reach new customers. However, this marketing form needs perceived content vividness and enduring involvement with products. The purpose of this study compares digital engagement (measured as an intention to recommend a retail brand online) produced by BCs of retailers at three levels of cognitive load (measured as exposure time to website).

Design/methodology/approach

Online quasi-experiments were conducted to analyze how SM platforms with diverse levels of enduring involvement with products, perceived content vividness and cognitive load influence digital engagement.

Findings

Results show enduring involvement with products produced digital engagement. In addition, cognitive load produced an inverted U-shaped effect on digital engagement in the condition of high content vividness (perceived). In the low content vividness condition, cognitive load produced similar or greater positive effects on digital engagement than those produced in the high content vividness condition.

Research limitations/implications

The study implies a willingness to recommend online serves as a proxy of digital engagement failing to capture the reciprocal activities from the firms to customers. It also assumes that measuring product importance and usage frequency of the product serve as proxies of enduring involvement failing to capture the hedonic motivations related to products.

Practical implications

Practitioners should prioritize enduring involvement with products over perceived content vividness to improve digital engagement and reach new customers through their BCs on SM platforms. In addition, managers should use SM with content perceived with low vividness to improve digital engagement.

Originality/value

The study shows the influence of enduring involvement with products on digital engagement. It supports applying the resource-matching theory in SM platforms. It offers an alternative operationalization of constructs. The study compares multiple products and SM platforms providing empirical evidence of distinct levels of content vividness between SM platforms, not considered in previous studies.

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Article

Premilla D'Cruz, Megan Paull, Maryam Omari and Burcu Guneri-Cangarli

– The purpose of this paper is to explore target experiences of workplace bullying across Australia, India and Turkey, uncovering cross-cultural convergence and divergence.

Abstract

Purpose

The purpose of this paper is to explore target experiences of workplace bullying across Australia, India and Turkey, uncovering cross-cultural convergence and divergence.

Design/methodology/approach

A questionnaire-based qualitative data survey of business school students with current/prior work experience (n=399) was undertaken. In total, 114 respondents (57 Australian, 34 Indian, 23 Turkish) identified themselves as targets of workplace bullying. Close-ended data pertaining to sociodemographic details were analysed via Statistical Package for the Social Sciences for descriptive statistics while open-ended data pertaining to experiences of bullying were thematically analysed against pre-figured categories derived from literature.

Findings

Manifestations of, etiology of and coping with workplace bullying were similar across all three countries, highlighting cultural universals. Clear variations in source of bullying behaviour and availability and use of formal interventions as well as more subtle variations relating to coexistence with category-based harassment, outcomes and bystander behaviour underscored the influence of national culture.

Research limitations/implications

Inclusion of a student population, notwithstanding their work experience, as well as reliance on the questionnaire as a tool pose limits in terms of external validity and communication congruence.

Practical implications

Understanding into the similarities and differences of workplace bullying across cultures facilitates the design of interventions tailor-made for a particular society, serving as inputs for international/multi-national and offshored business enterprises.

Originality/value

The study, focusing on multiple aspects of target experiences, not only draws on both dimensional and metaphorical cross-cultural frameworks but also includes geographically dispersed and socially diverse nations. Thus, it extends insights from previous cross-cultural explorations of workplace bullying which, apart from being few in number, are limited either by their frameworks, spatial range and/or thematic coverage.

Details

Employee Relations, vol. 38 no. 5
Type: Research Article
ISSN: 0142-5455

Keywords

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