A mathematical model and genetic algorithm-based approach for parallel two-sided assembly line balancing problem

Assembly lines are usually constructed as the last stage of the entire production system and efficiency of an assembly line is one of the most important factors which affect the performance of a complex production system. The main purpose of this paper is to mathematically formulate and to provide an insight for modelling the parallel two-sided assembly line balancing problem, where two or more two-sided assembly lines are constructed in parallel to each other. We also propose a new genetic algorithm (GA)-based approach in alternatively to the existing only solution approach in the literature, which is a tabu search algorithm. To the best of our knowledge, this is the first formal presentation of the problem as well as the proposed algorithm is the first attempt to solve the problem with a GA-based approach in the literature. The proposed approach is illustrated with an example to explain the procedures of the algorithm. Test problems are solved and promising results are obtained. Statistical tests are designed to analyse the advantage of line parallelisation in two-sided assembly lines through obtained test results. The response of the overall system to the changes in the cycle times of the parallel lines is also analysed through test problems for the first time in the literature.     

Immigrant workers in the Libyan labour force

Using a series of statistical analyses, this study assesses the importance of foreign labour in the Libyan economic and social structures over the last 30 years. It notes the development of a particular series of dependencies on such labour, especially in skilled and professional occupations. Despite the government's declared policy of Libyanization, the authors note the development of a parallel labour market of nationals and non‐nationals and the consequential difficulties of moving towards full implementation of such a policy.     

Is Tourism Marriage of Young Girls in Egypt a Form of Child Sexual Abuse? A Family Exploitation Perspective

Tourism marriage in Egypt is considered a part of the child marriage phenomenon, as parents following false interpretations of Islamic teachings offer up their daughters for short-term sexual relationships in return for money from tourists. This exploratory study used qualitative methods to interview 42 parents who reside in the city of Darasa, Giza, Egypt, whose daughters were persuaded to engage in tourism marriage. Eight social work students utilized an interview guide that contained 10 questions exploring how parents strike deals with tourists and avoid all legal and traditional procedures of marriage in Egypt. The findings of this study were summarized in six distinct themes, which show evidence of family exploitation of young women. This experience likely increases the child’s vulnerability to psychological, social, and physical consequences.     

Restoring Hope for Syrian Refugees: Social Support Students Need to Excel at School

This qualitative, phenomenological case study was designed to elicit Syrian refugee students’ perceptions regarding the individuals who provide them with the social support needed for academic success. Semi-structured interviews were conducted with 10 male Syrian eighth graders at a public middle school in Lebanon. House's social support framework guided this study and served as the theoretical lens through which data were collected and analysed. Findings from this study revealed teachers, supervisors, and administrators as expected major providers of the social supports that Syrian refugee students need to excel in their studies. However, when students do not find support where they might expect it to be, they adopt coping strategies such as independence, perseverance, self-efficacy, and peer-teaching. These findings are of primary importance to school administrators, humanitarian aid agencies, and policymakers. The article concludes with recommendations for practice and future research.     

Whistle blowing and research integrity: Potential remedy for research misconduct in Malaysian institutions of higher education

This study found that less than half of the respondents are willing to blow the whistle. The results reveal that a lack of protection with regard to the whistleblower’s identity, the tedious investigative process, and the notion of avoiding confrontation, which is more apparent in Asian cultures as compared to the West, are among the reasons why individuals who witnessed misconduct chose to remain silent. Adhering to the Asian cultural upbringing where the young must respect the old, those of lower rank must obey those with higher authority, and subordinates do not question the actions of their superior, has become a norm even in the working environment. Therefore, emphasize the need for better protection for whistleblowers including using experienced individuals with a research ethics background to handle allegations from whistleblowers. In addition, established guidelines and procedures for whistleblowers with regard to voicing their allegations against colleagues engaged in research misconduct is still lacking or, to a certain extent, is still unknown to researchers. Thus, the concern indicates a need for institutions to create awareness among researchers regarding the existing platform for whistleblowers, or to develop a systematic and clear procedure which is reliable and independent to promote professionalism in academia.     

Contesting Claims on Measuring Performance in the Public Sector Using Performance Audits: Evidence from the Literature

Based on desk study, this article adduces theoretical and empirical evidence to analyze the claims of advocates and critics of performance audit (PA). The paper establishes that the application of PA in some developed countries has led to improvement in aspects of public sector performance albeit sometimes short of the often highlighted effects of economy, efficiency and effectiveness. The article further provides evidence to support the claim that despite its touted contribution to performance, PA could rather lead to anti-innovation, nit-picking, expectations gap, lapdog, headline hunting, unnecessary systems and hollow ritual. The paper questions the quality of reported PA systems in the literature and advocates a PA regime that strikes a delicate balance between compliance and performance.     

A note on spearman's footrule

We obtain exact tables of the null distribution of Spearman's footrule for sample sizes n = 4(1)40 by using a certain Markov chain property, and we investigate the adequacy of approximations to the distribution.     

Bounds of moment generating functions of some life distributions

In this article we show that if a life has new better than used in expectation (NBUE) ageing property and if the mean life is finite then the moment generating function exists and is finite. In fact, the moment generating function is shown to be bounded above by that of the exponential distribution with the same mean. Analogous results are also proven for two much bigger families of life distribution, namely, the new better than renewal used in expectation (NBRUE) and the renewal new is better than used in expectation (RNBUE) and the renewal new better than renewal used in expectation (RNBRUE), provided that the life has finite two moments. Further, stronger results are also obtained for the smaller new better than used version of the above classes.