Application of Design of Experiment and Computer Simulation to Improve the Color Industry Productivity: Case Study

2014 ◽  
Vol 68 (4) ◽  
Author(s):  
Seyed Mojib Zahraee ◽  
Shahab Shariatmadari ◽  
Hadi Badri Ahmadi ◽  
Saeed Hakimi ◽  
Ataollah Shahpanah

One of the controversial issues in manufacturing companies is bottleneck. Managers and engineers try to deal with this difficulty to improve the productivity such as increasing resource utilization and throughput. One color factory is selected as a case study in this paper. This company tries to identify and decrease the bottlenecks in the production line. The goal of this paper is building the simulation model of production line to improve the productivity by analyzing the bottleneck. To achieve this goal, statistical method named design of experiment (DOE) was performed in order to find the optimum combination of factors that have the significant effect on the process productivity. The analysis shows that all of the main factors have a significant effect on the production line productivity. The optimum value of productivity is achieved when the number of delpak mixer (C) and number of lifter (D) to be located at high level that is equal to 2 and 2 respectively. The most significant conclusion of this study is that 3.2 labors are required to reach maximum productivity based on the resource utilization and cost. It means that 3 full time labors and one part time labor should be employed for the production line. 

2014 ◽  
Vol 933 ◽  
pp. 744-748 ◽  
Author(s):  
Seyed Mojib Zahraee ◽  
Saeed Rahimpour Golroudbary ◽  
Ahmad Hashemi ◽  
Jafar Afshar ◽  
Mohammadreza Haghighi

One of the controversial issues in manufacturing systems is bottleneck. Managers and engineers are trying to find methods to eliminate the bottlenecks and waiting times in the production line. More over the manufacturing companies are striving to sustain their competiveness by decreasing the bottlenecks, total cost and increasing the productivity. The objective of this study is applying the computer simulation to analysis the production line bottlenecks. To achieve this goal a color manufacturing line was selected as a case study and the basic application of arena 13.9 software. Finally the some modifications in the simulation model are proposed to improve the production line as well as to decrease the bottleneck.


2020 ◽  
Vol 122 (7) ◽  
pp. 2089-2103
Author(s):  
Rosario Michel-Villarreal ◽  
Eliseo Luis Vilalta-Perdomo ◽  
Martin Hingley

PurposeThe purpose of this study is to explore food producers' motivations and challenges whilst participating in short food supply chains (SFSCs). This paper compares findings with previous literature and investigates the topic in the context of producers' motivations.Design/methodology/approachThe paper includes a literature review concerning producers' motivations to engage in SFSCs. A case study was designed to investigate motivations underlying producers' engagement in SFSCs, as well as the challenges that they face. Semi-structured interviews were conducted in a farmers' market located in Mexico. Thematic analysis is used to identify the principal issues for producers'. Propositions based on findings are presented.FindingsFindings suggest that small, large, part-time and full-time producers are willing to engage with farmers' markets for diverse primary economic and non-economic motivations. Individual and collective challenges were also identified.Originality/valueThis research helps to explain producers' motivations and challenges within SFSCs in an under-researched context, namely a focus on producers' and in the Global South.


2013 ◽  
Vol 845 ◽  
pp. 770-774 ◽  
Author(s):  
Seyed Mojib Zahraee ◽  
Milad Hatami ◽  
J.M. Rohani ◽  
H. Mihanzadeh ◽  
Mohammadreza Haghighi

In the manufacturing industry, managers and engineers are seeking to find methods in order to eliminate the common problems in manufacturing systems such as bottlenecks and waiting times. This is because that all of these kinds of problems impose extra cost to the companies. In addition, manufacturing companies are striving to sustain their competitiveness by improving productivity, efficiency and quality of manufacturing industry for instance high throughput and high resource utilization. The paper concentrates on the application of computer simulation to analysis manufacturing system in order to improve the productivity. Therefore, this study introduces a color manufacturing line as a case study and the basic application of arena 13.9 software. The goal of this paper is to improve the productivity and efficiency of the production line by using computer simulation. To achieve this goal, first the basic model of the current situation of production line was simulated. Second, three different alternatives were simulated and modified to find the best scenario based on the maximum productivity and minimum total cost.


2015 ◽  
Vol 30 (3) ◽  
pp. 225-238 ◽  
Author(s):  
Lenka Formánková ◽  
Alena Křížková

Purpose – The aim of this paper is to analyse the experience of female part-time professionals with employee and managerial positions with the utilisation of flexible work arrangements in a corporate environment in the country with a full-time dominated work culture. The data represent a rare case study of the work environment in a Czech branch of one multinational company. This paper focusses on the position of female employees working part-time in professional and managerial positions. The reason for such an arrangement is their attempt to combine career and care for pre-school children. This paper evaluates the effects of flexible work policies in an environment where part-time work for female professionals is rarely available and, therefore, precious. In particular, this paper discusses conditions under which these arrangements are available and its impact on gender equality. Design/methodology/approach – The paper represents a rare case-study of an organisational environment. The seven analysed interviews derive from a larger study on the corporate environment which included 35 interviews and a series of participatory observations. In the analysis, the following questions are discussed: What is the position of employees working within flexible working arrangements in a specific corporate culture? Which aspects of flexible working arrangements affect the professional recognition and evaluation of the employees? To what extent and how do flexible working arrangements affect employee satisfaction with their working and private lives? Findings – The data reveal the diverse and often subtle forms of discrimination and exploitation of working mothers, who use the flexible working arrangement as a work-family reconciliation strategy. Female employees working with alternative working arrangements do not have equal bargaining power in comparison to other employees, regardless of whether they are professionals, and sometimes in managerial positions. At the formal level, the part-time professionals are restricted in pay and in access to the company benefits. In the informal relations within the workplace, their work lacks of sufficient recognition of colleagues and superiors. Overall, part-time work for female professionals and managers leads to an entrapment between the needs of their family and the expectations of their employer. Practical implications – The research reveals the practical limitation in introducing policies the work-life reconciliation policies. The results show the need to focus on promoting better conditions for employees working part-time. Also, it shows that managerial and highly demanding professional positions can be executed on a part-time basis if the work environment is open towards accepting this arrangement. Moreover, the findings outline the possibilities of developing workplace practices in the Czech Republic in a woman-friendly direction. Social implications – Specific legislative arrangements should be enacted, providing better protection for employees in non-standard employment. At the same time, the incentives for employers to enable part-time working arrangements should be provided. Originality/value – The amount of research on female professionals working part-time or from home is rather limited in context of the post-communist countries. The paper discusses the “double” tokenism of the women working in the leadership positions and at the same time in flexible working arrangements in the full-time working culture.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Stan Lester

PurposeThis paper examines architecture as an example of the evolving context of qualifying routes in UK professions.Design/methodology/approachThe background and current state of architectural education, qualifying routes and regulatory frameworks in the UK is presented as a case-study, and compared with practices in professional education and qualifying more generally including the use of Degree Apprenticeships.FindingsArchitecture has since the 1960s maintained an entry-route that is premised on periods of full-time academic study plus full-time practice. While a minority part-time version of this route has always existed (and is now being expanded through Degree Apprenticeships), variations seen in other professions such as experienced practitioner entry and accelerated routes from cognate fields have so far been lacking. Pressures for reform are emerging both from external changes affecting the profession and from the high cost of qualifying in relation to median incomes in the sector.Practical implicationsThere is a need for more flexible and less expensive routes to qualifying as an architect, with substantial scope to use practices from other professions and areas of higher education to recognise existing levels of competence and improve crossover with other design and construction fields.Originality/valueThis is the first review of architectural qualifying requirements that has been made in the context of professional entry more generally.


2014 ◽  
Vol 606 ◽  
pp. 199-203 ◽  
Author(s):  
Milad Hatami ◽  
Seyed Mojib Zahraee ◽  
Alireza Khademi ◽  
A. Shahpanah ◽  
Jafri Mohd Rohani

Productivity plays a significant role for most companies in order to measure the efficiency. In reality there is an essential need to evaluate the different factors which increasing productivity and achieving the high level of quality, high production rate , machine utilization. On the other hand, manufacturing companies are striving to sustain their competitiveness by improving productivity and quality of manufacturing industry. So it can be acquired by finding ways to deal with various industrial problems which have affected the productivity of manufacturing systems. This paper aims at applying statistical analysis and computer simulation to recognize and to weight the significance of different factors in the production line. Based on the final result the two factors which are B (Number of labor) and C (Failure time of lifter) have the most significant effect on the manufacturing system productivity. In order to achieve the maximum productivity the factors should be placed on the levels which are: A= -1, B=1, C=1 and D=1. This means that the service rate of mixer = UNIF (20, 40), number of labor=20, failure time of lifter =60 min and number of permil=5 respectively.


2021 ◽  
Vol 16 (5) ◽  
pp. 2559-2574
Author(s):  
Arija Kolosova

Due to the outbreak of the COVID-19 pandemic, most students were forced to study remotely, including students in Latvia. This publication aims to reflect on the remote learning process during Covid-19, analysing the results obtained by students during their internships. The research study involves 81 full-time and part-time students of Liepaja University study programmes. This publication is based on qualitative empirical research, using the case study method within a natural environment. The results were analysed using content analysis. As the result of this study, the conclusions are drawn, revealing the identified problems, strong points and contradictions in the learning process, providing a basis for improvements. The obtained research results can serve as a foundation for the research in future. Keywords: consequences of Covid -19, remote learning process, internship


Author(s):  
Mické van der Westhuizen ◽  
Yolandi Woest

In this qualitative case study, we explored the experiences of beginner teachers who chose two different routes-full-time and part-time studying-on the journey to becoming teachers and we report on the influences of this choice on their emergent beginner teacher identities. We purposefully selected two groups of participants, each consisting of three who studied full-time and three who studied part-time. The latter worked part-time at schools or in similar educational contexts while they were studying. Epistemologically underpinned by the interpretivist paradigm, we employed the Possible Selves theory (Marcus & Nurius, 1986) as the theoretical lens. Inductive thematic analysis of data demonstrated three main themes. First, data showed a distinct divergence between the perceptions of initial beginner teacher identity states in the two groups of participants. Second, both groups of participants agreed that time is a significant factor in the complex psychological processes required for the construction of a beginner teacher identity. Third, both groups strongly considered practical experience as an essential factor for beginner teacher identity development.


2020 ◽  
Author(s):  
◽  
Amy L. Gearhart

The issue this dissertation addresses is that the fastest growing population of clergy leaders in The United Methodist Church (UMC) are local pastors who are generally not seminary degreed, ordained, or guaranteed employment. And yet, the employment and effectiveness of these local pastors, primarily part-time, is not researched or understood in the context of leadership needs in the 21st century Church. To address this problem, the purpose of this qualitative case study is to understand the unique professional experiences and labor conditions of part-time local pastors (PTLP's) in isolated, rural, and declining communities within the Mountain Sky Conference (MSC) of The UMC. To gather data, artifact review, demographic surveys, and Zoom interviews were conducted with eight part-time local pastors from the Mountain Sky Conference. The data lead to the following themes: types and unique leadership of PTLP's, unique contextual labor conditions, and professional resources needed. These themes are useful for understanding that many of the professional and institutional benefit systems in which PTLP's operate are forged and framed for full-time, lifelong ordained clergy. They need to be adjusted for the unique types of PTLP's and their unique ministry settings.


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