The purpose of this paper is to propose a predictive maintenance (PdM) system for hybrid degradation processes with continuous degradation and sudden damage to improve maintenance…
Abstract
Purpose
The purpose of this paper is to propose a predictive maintenance (PdM) system for hybrid degradation processes with continuous degradation and sudden damage to improve maintenance effectiveness.
Design/methodology/approach
The PdM system updates the degradation model using partial condition monitoring information based on degradation type judgment. In addition, an extended multi-step-ahead updating stopping condition is adopted for performance enhancement of the PdM system.
Findings
An extensive numerical investigation compares the performance of the PdM system with the corresponding preventive maintenance (PM) policy. By carefully choosing the updating stopping condition, the PdM policy performs better than the corresponding PM policy.
Research limitations/implications
The proposed PdM system is applicable to single-unit systems. And the continuous degradation process should be well modeled by the stochastic linear degradation model (Gebraeel et al., 2009).
Originality/value
In literature, there are abundant studies on PdM policies for continuous degradation processes. However, research on hybrid degradation processes still focuses on condition-based maintenance policy and a PdM policy for a hybrid degradation process is still unreported. In this paper, a PdM system for hybrid degradation processes with continuous degradation and sudden damage is proposed. The PdM system decides PM schedules by fully utilizing the condition monitoring data of each specific product, and can hopefully improve maintenance effectiveness.
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Zhitao Yan, Yongli Zhong, William E. Lin, Eric Savory and Yi You
This paper examines various turbulence models for numerical simulation of a steady, two-dimensional (2-D) plane wall jet without co-flow using the commercial CFD software (ANSYS…
Abstract
Purpose
This paper examines various turbulence models for numerical simulation of a steady, two-dimensional (2-D) plane wall jet without co-flow using the commercial CFD software (ANSYS FLUENT 14.5). The purpose of this paper is to decide the most suitable and most economical method for steady, 2-D plane wall jet simulation.
Design/methodology/approach
Seven Reynolds-averaged Navier–Stokes (RANS) turbulence models were evaluated with respect to typical jet scaling parameters such as the jet half-height and the decay of maximum jet velocity, as well as coefficients from the law of the wall and for skin friction. Then, a plane wall jet generating from a rectangular slot of 1:6 aspect ratio located adjacent to the wall was investigated in a three-dimensional (3-D) model using large eddy simulation (LES) and the Stress-omega Reynolds stress model (SWRSM), with the results compared to experimental measurements.
Findings
The comparisons of these simulated flow characteristics indicated that the SWRSM was the best of the seven RANS models for simulating the turbulent wall jet. When scaled with outer variables, LES and SWRSM gave generally indistinguishable mean velocity profiles. However, SWRSM performed better for near-wall mean velocity profiles when scaled with inner variables. In general, the results show that LES performed reasonably well when predicting the Reynolds stresses.
Originality/value
The main contribution of this article is in determining the capabilities of different RANS turbulence closures and LES for the prediction of the 2-D steady wall jet flow to identify the best modelling approach.
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While public libraries are well-established as a place to borrow books and use reference materials, they are less recognized for the services and programs they offer to their…
Abstract
While public libraries are well-established as a place to borrow books and use reference materials, they are less recognized for the services and programs they offer to their local communities. These programs and services often directly or indirectly impact the health of patrons and the larger community.
While some public libraries offer programs that address patron health in collaboration with other health professionals, such as those at local universities, public health departments, and other health-related organizations, these collaborations are often informal, offered for an indefinite period of time, and rely on finite funding. While public health professionals and organizations are often overlooked in public library collaborations, they are a natural fit for collaboration.
As public libraries serve the needs of vital and often vulnerable members of our communities, it is important to build sustainable community partnerships when offering programs and services that impact patron health. This will not only identify organizations committed to improving the health of these populations and those that provide reliable resources; it will also streamline information and provide consistent information to identify safe and reliable resources on social media, the internet, and in the community.
This chapter serves as a reflective narrative which explores how public libraries and community organizations can collaborate, identifies anticipated challenges, and describes considerations and strategies for addressing these challenges. The ultimate goal is to identify how libraries can expand the depth and breadth of both library services and public health organizations to sustainably improve the health of the local community.
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Excessive teacher entitlement results from interactions between and among social, institutional and individual elements. This study retrieves small entitlement stories of two…
Abstract
Excessive teacher entitlement results from interactions between and among social, institutional and individual elements. This study retrieves small entitlement stories of two teachers and one school principal from an online elementary teacher community in China. Through burrowing into the narrative data, this study presents how the three participants' selves are revealed in their interactions with different community members. The multi-layered relationships between entitlement, reflection, unknown self, personal/professional experiences, and teacher community are discussed. This study provides insights into how administrators, teachers and other educators can collaborate to foster teachers' self-understanding, with the purpose of ameliorating excessive teacher entitlement.
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This paper aims to analyze dLife, an integrated media network dedicated to empowering Americans living with diabetes. It shows how dLife's use of integrated marketing…
Abstract
Purpose
This paper aims to analyze dLife, an integrated media network dedicated to empowering Americans living with diabetes. It shows how dLife's use of integrated marketing communications (IMC), particularly the public relations component, represents an emerging direction in health product and services marketing. Although some have been skeptical about IMC and specifically the public relations role within it, the paper aims to argue that public relations, through sponsorships, helps organizations interested in IMC to create new types of relationships with marketers and patients.
Design/methodology/approach
To demonstrate public relations' importance in IMC, dLife's relationship with the changing health marketing landscape is contextualized. Constitutive and empowerment theory is employed to frame a rhetorical analysis of dLife's efforts to target marketers and patients. The rhetorical analysis demonstrates how dLife's rhetorical choices help to shape marketer strategy, patient identity and discursive behavior.
Findings
The paper finds that dLife's use of public relations as part of its IMC approach helps to create more engaging disease education yet increases commercial content in patients' lives. It further theorizes the role of public relations within the IMC framework, an area that has been neglected in scholarship.
Research limitations/implications
This is a rhetorical study that should be complemented by empirical methods in order to comprehensively explore the IMC/health information issue.
Practical implications
The paper demonstrates to practitioners how public relations sponsorships used in IMC build trust and boost education and awareness among target audiences. The paper also cautions that public relations practitioners' use of IMC may privilege corporate interests over patient concerns.
Originality/value
This is the first research study of a corporation's use of public relations sponsorships as part of an overall IMC strategy.
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Kwok Wah Ronnie Lui and Sarojni Choy
This paper aims to report on a study that used the practice theory lens to understand how Chinese ethnic culture influences restaurant workers' learning through engagement in…
Abstract
Purpose
This paper aims to report on a study that used the practice theory lens to understand how Chinese ethnic culture influences restaurant workers' learning through engagement in everyday work practices.
Design/methodology/approach
A multiple case study approach was used. Data were collected from semi-structured interviews and site observations. Thematic analysis was conducted to identify how workers learnt the sayings, doings and relatings in their workplaces.
Findings
The findings show that the ethnic culture of the participants influences and enriches their learning in practice settings such as small Chinese restaurants.
Research limitations/implications
The understandings presented here need to be verified through more research in different regions and nations. In addition, cross-cultural studies on other ethnic restaurants may contribute to deeper understandings of the influences of ethnic culture on practice-based learning.
Social implications
The research contributes to understanding the influence of ethnic culture on practice-based learning.
Originality/value
The understandings gained from the findings of this study form a useful basis for curriculum development and instructional design of training programmes for practice-based as well as work-integrated-learning components of vocational curriculum. Furthermore, awareness of the strengths of the ethnic culture is of interest to owner/managers of small Chinese restaurants to afford supportive learning environments for workers.
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Most current condition‐based maintenance (CBM) systems using proportional hazards model (PHM) assume that enough historical data are available. However, in many practical cases…
Abstract
Purpose
Most current condition‐based maintenance (CBM) systems using proportional hazards model (PHM) assume that enough historical data are available. However, in many practical cases, it is usually costly to collect much historical data prior to real practice (model implementation). This paper aims to focus on the necessity and benefits of updating a PHM with new samples generated in the process of model implementation.
Design/methodology/approach
First, an updating scheme is presented and embedded into the entire cycle of PHM establishment, its application/implementation, and its updating. Next, a simulation evaluation is conducted based on a typical degradation model.
Findings
By updating a PHM using newly generated samples, the precision and reliability of residual life (RL) prediction can be improved, especially close to system failure.
Research limitations/implications
The current version of PHM is typically for non‐repairable systems or those systems only receiving renewal maintenance. Further research should focus on the inclusion of the effect of imperfect maintenance.
Practical implications
The updating scheme enables maintenance practitioners to more precisely and reliably predict the RL of an in‐operation system, and enhances further CBM decision making.
Originality/value
This paper highlights the necessity and benefits of updating a PHM using emerging new training resources, which has not received enough attention in existing research/practice of a PHM.
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Heping He, Yanni Liu and Zhimin Zhou
With the rapid development of social media in the past few years, some dark aspects of usage have appeared, e.g., Weibo addiction. Therefore, the purpose of this paper is to…
Abstract
Purpose
With the rapid development of social media in the past few years, some dark aspects of usage have appeared, e.g., Weibo addiction. Therefore, the purpose of this paper is to address the question of how Weibo keeps users hooked.
Design/methodology/approach
The study utilizes the netnography method to explore the symptoms of Weibo addiction and how it is formed.
Findings
First, some Weibo users have typical symptoms of addictive behavior, such as withdrawal, loss of control and general living problems; second, narcissism plays an important role in the process of Weibo addiction and has a stronger effect on content generation than content consumption; third, some users use Weibo as a means to alleviate anxiety, but they can then become more anxious owing to addiction; and fourth, the effect of comments has two sides – on the one hand, comments are one kind of feedback to posts, satisfying posters’ social needs, while on the other hand, a storytelling system consists of one post and its comments, upon which some Weibo users become more dependent.
Research limitations/implications
This research is only a preliminary, exploratory study. Therefore, care should be taken when interpreting these findings.
Practical implications
This study should help social media service providers and users to pay attention to the risk of social media addiction. Social media service providers should take social responsibility, design more user-oriented guidelines for marketing ethics and launch more responsible marketing activities. Users should enhance self-control and better balance social media use and offline real life.
Originality/value
Netnography has not been widely used as an addictive behavior research technique. This study is further bolstered because it has also noticed the difference of addiction mechanisms between addictive micro-bloggers and their followers.
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Li-Chun Hsu, Wen-Hai Chih and Dah-Kwei Liou
Social media platforms established social relationship between the consumer and the brand community. The purpose of this paper is to propose a model to understand how…
Abstract
Purpose
Social media platforms established social relationship between the consumer and the brand community. The purpose of this paper is to propose a model to understand how dual-identification impact on the community citizenship behavior (CCB). Specifically, the authors propose perceived community-brand similarity (PCBS) influence CCB via dual-identification and brand passion (BP).
Design/methodology/approach
The research sample consists of 323 members who have used Apple product and used Apple fan page for more than one year, and structural equation modeling was used to test the research hypotheses.
Findings
The results indicated that PCBS directly influenced brand identification (BI) and community identification (CI), respectively. BI directly influenced CI. CI directly influenced BP, but BI not directly influenced BP. In the mediation effects, both the dual-identification factors and BP play important mediating roles.
Practical implications
From a managerial standpoint, this research provides implications for social network sites management.
Originality/value
This research fills a void in the BI and CI are coexisting but distinct aspects of virtual communities. In addition, the mediating role of dual-identification factors and BP in the online community consumer-brand relationship has not been fully investigated.