title: A novel machine learning method to investigate the web crippling behaviour of perforated roll-formed aluminium alloy unlipped channels under interior-two flange loading

authors: Fang, Zhiyuan (Arthur)

subjects: web crippling

abstract: This study presents a novel machine-learning model using the eXtreme Gradient Boosting (XGBoost) tool, for assessing the web crippling behaviour of perforated roll-formed aluminium alloy (RFA) unlipped channels (both fastened and unfastened) under interior-two-flange loading. A total of 1080 data points were generated for training the XGBoost model, utilizing an elastoplastic finite element (FE) model that was validated against 30 experimental results from the literature. A comparison against the numerical failure loads was conducted, and it was found that the prediction accuracy of XGBoost model was 94%. When compared with Ramdom Forest and Linear Regression methods, it was found that the proposed XGBoost model performed better than both the before mentioned methods. The web crippling strengths obtained from the XGBoost model, tests, and finite element analysis (FEA) were utilized to evaluate the performance of current design rules from the American Iron and Steel Institute (AISI), Australian/New Zealand Standards (AS/NZS 1664.1; AS/NZS 4600:2018) and Eurocode (CEN 2007). It is shown that the current design rules are not reliable to predict the web crippling strength of perforated RFA unlipped channels. As a consequence of the parametric analysis, new web crippling strength and web crippling strength reduction factor formulae for perforated RFA unlipped channels were proposed. A reliability analysis was then conducted, which confirmed that the proposed equations are capable of accurately predicting the ITF web crippling strengths of perforated RFA unlipped channels.

text: A novel machine learning method to investigate the web crippling behaviour of perforated roll-formed aluminium alloy unlipped channels under interior-two flange loading This study presents a novel machine-learning model using the eXtreme Gradient Boosting (XGBoost) tool, for assessing the web crippling behaviour of perforated roll-formed aluminium alloy (RFA) unlipped channels (both fastened and unfastened) under interior-two-flange loading. A total of 1080 data points were generated for training the XGBoost model, utilizing an elastoplastic finite element (FE) model that was validated against 30 experimental results from the literature. A comparison against the numerical failure loads was conducted, and it was found that the prediction accuracy of XGBoost model was 94%. When compared with Ramdom Forest and Linear Regression methods, it was found that the proposed XGBoost model performed better than both the before mentioned methods. The web crippling strengths obtained from the XGBoost model, tests, and finite element analysis (FEA) were utilized to evaluate the performance of current design rules from the American Iron and Steel Institute (AISI), Australian/New Zealand Standards (AS/NZS 1664.1; AS/NZS 4600:2018) and Eurocode (CEN 2007). It is shown that the current design rules are not reliable to predict the web crippling strength of perforated RFA unlipped channels. As a consequence of the parametric analysis, new web crippling strength and web crippling strength reduction factor formulae for perforated RFA unlipped channels were proposed. A reliability analysis was then conducted, which confirmed that the proposed equations are capable of accurately predicting the ITF web crippling strengths of perforated RFA unlipped channels.

year: 2022

title: Exploring the antecedents of intentions to leave the job: The case of luxury hotel staff

authors: Mohsin, Asad

subjects: staff turnover

abstract: The aim of this study is to assess the antecedents of employee’ intentions to resign from their jobs in luxury hotels in India. Two aspects are considered in this context: firstly, the employees’ enthusiasm for the profession and organisation, the nature of the work and its impact on social and family life. Secondly, their level of satisfaction with the job in terms of organisational loyalty, relationship with supervisors, job security, earnings and additional benefits. A theoretical model (see Fig. 1) and seven hypotheses are tested to indicate whether the employees’ level of agreement with statements about the job and their level of satisfaction with the job will impact their intentions to quit. The study further examines if any current employees intend to leave their job. The term luxury hotel is used to represent 5 star and 4 star hotels of India.
Findings from the analyses of 884 responses suggest that, when considering intentions to resign from the job, a negative relationship is found between professional and organisational enthusiasm and perceptions about the work being stimulating. No support was found for a positive relationship between the extent work impacted social and family life and the intention to quit. However, results supported the notion that the employee's organisational loyalty has a negative effect on his/her intention to resign from the job. Our findings contradict several other studies in that they suggest the employee's intention to resign from the job increases as job security and earnings improve. The study is distinctive as it explores intentions luxury hotel employees in India to leave their jobs; three is little evidence in the wider literature of similar attempts in the context of the Indian hotel industry. The outcomes have implications for both theory and practice as this is the first such major study in the context of the hotel industry in India where there is a population of over a billion people and an expanding hotel industry.

text: Exploring the antecedents of intentions to leave the job: The case of luxury hotel staff The aim of this study is to assess the antecedents of employee’ intentions to resign from their jobs in luxury hotels in India. Two aspects are considered in this context: firstly, the employees’ enthusiasm for the profession and organisation, the nature of the work and its impact on social and family life. Secondly, their level of satisfaction with the job in terms of organisational loyalty, relationship with supervisors, job security, earnings and additional benefits. A theoretical model (see Fig. 1) and seven hypotheses are tested to indicate whether the employees’ level of agreement with statements about the job and their level of satisfaction with the job will impact their intentions to quit. The study further examines if any current employees intend to leave their job. The term luxury hotel is used to represent 5 star and 4 star hotels of India.
Findings from the analyses of 884 responses suggest that, when considering intentions to resign from the job, a negative relationship is found between professional and organisational enthusiasm and perceptions about the work being stimulating. No support was found for a positive relationship between the extent work impacted social and family life and the intention to quit. However, results supported the notion that the employee's organisational loyalty has a negative effect on his/her intention to resign from the job. Our findings contradict several other studies in that they suggest the employee's intention to resign from the job increases as job security and earnings improve. The study is distinctive as it explores intentions luxury hotel employees in India to leave their jobs; three is little evidence in the wider literature of similar attempts in the context of the Indian hotel industry. The outcomes have implications for both theory and practice as this is the first such major study in the context of the hotel industry in India where there is a population of over a billion people and an expanding hotel industry.

year: 2013

title: Disabled Māori and disability support options

authors: Nikora, Linda Waimarie

subjects: Maori

abstract: The goal of this research project was to provide information to enhance the development and implementation of an effective model of disability support service provision to Maori with disabilities. This was done by identifying and documenting the needs expressed by disabled Maori and their carers living in the Midland area, and by considering the experiences and observations of a key informant group. From our reading of the literature and the feedback we received from participants, a proposed model of disability support service provision has been proposed.

In five sections, this report begins by defining disability, and also by defining the act of caring for the disabled. Focussing on the Maori experience, obstacles, access to existing support services, cultural barriers, and health policies are discussed. In the second chapter, the research methodology is described, along with how the information was gathered. Following this is the third section which presents the opinions and reflections of Maori with disabilities. It concludes strategically with a view of the ideal community, suggesting possible resolutions, by exposing current flaws and inadequacies. Chapter four records the views and perspectives of key informant/whanau carers who participated in the project. They offer an insightful account of the often unrecognised side of the disability experience. Considering the preceding discussions, the final section develops a model of service provision for Maori with disabilities, and proposes this for effective service delivery.

text: Disabled Māori and disability support options The goal of this research project was to provide information to enhance the development and implementation of an effective model of disability support service provision to Maori with disabilities. This was done by identifying and documenting the needs expressed by disabled Maori and their carers living in the Midland area, and by considering the experiences and observations of a key informant group. From our reading of the literature and the feedback we received from participants, a proposed model of disability support service provision has been proposed.

In five sections, this report begins by defining disability, and also by defining the act of caring for the disabled. Focussing on the Maori experience, obstacles, access to existing support services, cultural barriers, and health policies are discussed. In the second chapter, the research methodology is described, along with how the information was gathered. Following this is the third section which presents the opinions and reflections of Maori with disabilities. It concludes strategically with a view of the ideal community, suggesting possible resolutions, by exposing current flaws and inadequacies. Chapter four records the views and perspectives of key informant/whanau carers who participated in the project. They offer an insightful account of the often unrecognised side of the disability experience. Considering the preceding discussions, the final section develops a model of service provision for Maori with disabilities, and proposes this for effective service delivery.

year: 2004-01-01