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Article
Publication date: 6 September 2021

Bahareh Shafipour-Omrani, Alireza Rashidi Komijan, Seyed Jafar Sadjadi, Kaveh Khalili-Damghani and Vahidreza Ghezavati

One of the main advantages of the proposed model is that it is flexible to generate n-day pairings simultaneously. It means that, despite previous researches, one-day to n

Abstract

Purpose

One of the main advantages of the proposed model is that it is flexible to generate n-day pairings simultaneously. It means that, despite previous researches, one-day to n-day pairings can be generated in a single model. The flexibility in generating parings causes that the proposed model leads to better solutions compared to existing models. Another advantage of the model is minimizing the risk of COVID-19 by limitation of daily flights as well as elapsed time minimization. As airports are among high risk places in COVID-19 pandemic, minimization of infection risk is considered in this model for the first time. Genetic algorithm is used as the solution approach, and its efficiency is compared to GAMS in small and medium-size problems.

Design/methodology/approach

One of the most complex issues in airlines is crew scheduling problem which is divided into two subproblems: crew pairing problem (CPP) and crew rostering problem (CRP). Generating crew pairings is a tremendous and exhausting task as millions of pairings may be generated for an airline. Moreover, crew cost has the largest share in total cost of airlines after fuel cost. As a result, crew scheduling with the aim of cost minimization is one of the most important issues in airlines. In this paper, a new bi-objective mixed integer programming model is proposed to generate pairings in such a way that deadhead cost, crew cost and the risk of COVID-19 are minimized.

Findings

The proposed model is applied for domestic flights of Iran Air airline. The results of the study indicate that genetic algorithm solutions have only 0.414 and 0.380 gap on average to optimum values of the first and the second objective functions, respectively. Due to the flexibility of the proposed model, it improves solutions resulted from existing models with fixed-duty pairings. Crew cost is decreased by 12.82, 24.72, 4.05 and 14.86% compared to one-duty to four-duty models. In detail, crew salary is improved by 12.85, 24.64, 4.07 and 14.91% and deadhead cost is decreased by 11.87, 26.98, 3.27, and 13.35% compared to one-duty to four-duty models, respectively.

Originality/value

The authors confirm that it is an original paper, has not been published elsewhere and is not currently under consideration of any other journal.

Details

Kybernetes, vol. 51 no. 12
Type: Research Article
ISSN: 0368-492X

Keywords

Article
Publication date: 1 March 1989

M.T. Tabucanon and M.D.E. Estraza

Production planning requires that consideration be given to the various aspirations of management, customers and workers. These multiple goals, however, tend to be…

Abstract

Production planning requires that consideration be given to the various aspirations of management, customers and workers. These multiple goals, however, tend to be conflicting in nature. A multiple goal model structure is formulated for a garment factory based on the objectives of the company including minimisation of lateness, maximisation of revenue, minimisation of production cost, and minimisation of overtime. The model was applied using real data obtained from the subject company and was run using the Sequential Linear Goal Programming (SLGP) algorithm implemented with the use of the MPSX package in an IBM computer. Sensitivity analysis was performed to give insights to the decision makers concerning trade‐offs that exist among the conflicting objectives.

Details

International Journal of Clothing Science and Technology, vol. 1 no. 3
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 25 July 2019

Tritos Laosirihongthong, Premaratne Samaranayake and Sev Nagalingam

The purpose of this paper is to propose a holistic approach for supplier evaluation and purchasing order allocation among the ranked suppliers who meet acceptable levels…

1542

Abstract

Purpose

The purpose of this paper is to propose a holistic approach for supplier evaluation and purchasing order allocation among the ranked suppliers who meet acceptable levels of economic, environmental and social measures.

Design/methodology/approach

A mixed research method of case study and analytical approach is adopted in this research. A fuzzy analytical hierarchical process (FAHP) is applied for ranking of suppliers. Supplier ranks are validated using judgements from multiple decision makers. Purchasing order allocation among the ranked suppliers is determined using cost minimization subject to multiple criteria of economic, environmental and social conditions. A cement manufacturing case example demonstrates and validates the proposed approach.

Findings

The research shows that both economic and environmental considerations are significant when suppliers are evaluated for sustainable procurement within the best practice of supply management process. Ranking of suppliers, based on experts’ opinions, indicates varying degrees of importance for each criterion. Adoption of sustainable procurement criteria for evaluating supplier in a cement manufacturing organization is explained by three organizational theories including resource-based, institutional and dynamic capabilities theories. Preferred suppliers from FAHP method are confirmed by judgements from multiple decision-makers. The analysis reveals that purchasing order allocation is different when suppliers are evaluated based on their relative importance and overall ranking.

Research limitations/implications

Currently, individual performance measures and decision-makers are selected from a limited set. The purchasing allocation among ranked suppliers, subjected to cost minimization, incorporates environmental objective of acceptable carbon dioxide emission and social perspective of health and safety of workers, and provides a new approach for dual supplier evaluation and purchasing allocation problem in cement industry. Adopting the proposed supplier evaluation and order allocation approach in practice needs to be guided by the operational principles and an overall methodology which is appropriate for the specific industry with sustainability objectives.

Practical implications

This research enables decision-makers to incorporate sustainability analysis in the supplier evaluation as the basis for best practice with an industry-friendly holistic approach. Using organizational theories, the research re-enforces the importance of not only the energy consumption and environmental management systems of environmental dimension as driving forces/factors from Institutional theory perspective, but also pollution controls and prevention as purchasing capabilities from resource-based theory perspective. The proposed approach is expected to motivate decision-makers to consider sustainable perspectives in supplier evaluation and order allocation processes in a global supply chain and can become a benchmarking tool.

Social implications

Suppliers’ information on health and safety of their truck drivers are used in order allocation, thus emphasizing the importance of social dimension and encouraging better conditions and benchmarking for delivery drivers.

Originality/value

This paper extends the contribution to the literature by providing guidelines for managers to set strategies, benchmarks and policies within broader sustainable supply chain practices and demonstrates the applicability of the approach using a cement-manufacturing scenario in an emerging economy.

Content available
Book part
Publication date: 12 March 2019

Hamed Fazlollahtabar and Mohammad Saidi-Mehrabad

Abstract

Details

Cost Engineering and Pricing in Autonomous Manufacturing Systems
Type: Book
ISBN: 978-1-78973-469-0

Article
Publication date: 27 April 2010

Krystsina Bakhrankova

The purpose of this paper is to develop energy optimizer (ENEO) – a model‐based decision support system (DSS) for an existing European chemical plant with a multi‐stage…

2410

Abstract

Purpose

The purpose of this paper is to develop energy optimizer (ENEO) – a model‐based decision support system (DSS) for an existing European chemical plant with a multi‐stage continuous production process. The system comprises two modules – energy cost minimization and joined energy cost minimization and output maximization. Following the description of the researched production, the paper presents a gist of the underlying formulations. Then, it tests the DSS on real data instances with a focus on its configuration, practical implications and implementation challenges.

Design/methodology/approach

The design of the planning tool is consistent with that of the model‐based DSS and based on the existing information systems. The defined research problems are explored with the use of quantitative methods – the operations research methodology.

Findings

The findings show that ENEO reflects the essence of the researched production process and can provide benefits in practical business operations.

Research limitations/implications

Both the proposed system configuration and the formulated models lay a foundation to further research within the described industrial setting.

Practical implications

The system can be utilized in daily operations to provide substantial cost savings, improved capacity utilization and reactivity.

Originality/value

This paper contributes to research by bridging the gap between theory and practice. On the one hand, it describes an unexplored problem and its subsequent solution embodied in the DSS. On the other hand, it emphasizes the importance of applying the operations research methodology to the real‐world issues. Therefore, this work is valuable to both academics and practitioners.

Details

Industrial Management & Data Systems, vol. 110 no. 4
Type: Research Article
ISSN: 0263-5577

Keywords

Article
Publication date: 8 August 2016

Janya Chanchaichujit, Jose Saavedra-Rosas, Mohammed Quaddus and Martin West

The purpose of this paper is to take the first step in solving environmental supply chain management issues. It proposes a green supply chain management (GSCM) model which…

1145

Abstract

Purpose

The purpose of this paper is to take the first step in solving environmental supply chain management issues. It proposes a green supply chain management (GSCM) model which would provide environmental benefits to the Thai rubber industry. To this end, a GSCM optimisation model was formulated, whereby the manufacturing processes of rubber products, along with their distribution and transportation, could be improved. The expected result is that total greenhouse gas emissions would be minimised and environmental performance maximised.

Design/methodology/approach

Linear programming was chosen as the mathematical programming for investigation into the problem of finding the association of quantity of rubber product flow between the supply chain entities (farmer, trader group, and factory) and the transportation mode and route, with a view to minimise total greenhouse gas emissions.

Findings

The results indicate that by using the proposed model, GHG emissions could be minimised to 1.08 tons of GHGs per ton of product.

Practical implications

A GSCM model developed in this research can be used as a decision support tool for Thai rubber policy makers. This would allow them to better manage the Thai rubber industry to achieve environmental benefit.

Originality/value

This research is among the first attempts to develop a GSCM model for the Thai rubber industry. It can contribute to providing a basis for a GSCM modelling framework, along with a formulation for research development in this area.

Details

The International Journal of Logistics Management, vol. 27 no. 2
Type: Research Article
ISSN: 0957-4093

Keywords

Abstract

Details

Cost Engineering and Pricing in Autonomous Manufacturing Systems
Type: Book
ISBN: 978-1-78973-469-0

Article
Publication date: 1 June 2010

Mohammed Nurul Alam

The purpose of the paper is to present the result of an empirical review as to how and to what extent the interest‐free microfinance to micro entrepreneurs contributes in…

Abstract

The purpose of the paper is to present the result of an empirical review as to how and to what extent the interest‐free microfinance to micro entrepreneurs contributes in minimising different cots of both the lender and the borrowers. An institutional‐network theoretical approach is used to study the phenomenon. A qualitative nature of research methodology is used while studying this particular phenomenon. A multiple explanatory case study was adopted as a research strategy in order to focus on contemporary phenomenon within the real life context of different rural‐based micro entrepreneurs and their relationships with the lending organisations. Interest‐free microfinance by Islamic banks is characterised by a close supervision and an in‐kind type of financing, which contributes greatly in promoting lender‐borrower network relationships between the bank and the rural based micro entrepreneurs. Such network relationships result in minimising exchange costs and other business related costs of both the borrowers and the lending organisations. The study was mainly concerned with rural‐based micro entrepreneurs who are engaged in grass‐root type entrepreneurs like poultry and diary firm, handloom industry, etc. Particular reference is made here to the facts of rural‐based micro entrepreneurs and their relationships with Islamic banks in Bangladesh.

Details

World Journal of Entrepreneurship, Management and Sustainable Development, vol. 6 no. 3
Type: Research Article
ISSN: 2042-5961

Keywords

Article
Publication date: 28 May 2019

Omkarprasad S. Vaidya, L. Ganapathy and Sushil Kumar

The purpose of this paper is to consider a nonlinear problem of minimizing the cost of providing reliable systems. The authors assume that the system consists of several…

Abstract

Purpose

The purpose of this paper is to consider a nonlinear problem of minimizing the cost of providing reliable systems. The authors assume that the system consists of several components in series, and for each such component, the cost of the component increases exponentially with its reliability.

Design/methodology/approach

In order to solve this nonlinear optimization problem, the authors propose two approaches. The first approach is based on the concept of adjusting the reliability of a pair of components to minimize the cost of the system. The authors call this procedure as reliability adjustment routine (RAR). Proofs of optimality and convergence for the proposed model are also provided. The second approach solves the problem by using a Lagrangian multiplier. A procedure is developed to obtain the maximum step size to achieve the desired optimal solution in minimum iterations. Proposed approaches are efficient and give exact solutions.

Findings

Proposed methods enable a decision maker to allocate reliability to the components in series while minimizing the total cost of the system. The developed procedures are illustrated using a numerical example. Although an exponential relationship between the component cost and reliability is assumed, this can be extended to various other nonlinear distributions.

Originality/value

This cost optimization problem, subject to system component reliability values, assumes the near practical nonlinear pattern of cost vs reliability. Such problems are complex to solve. The authors provide a unique approach called RAR to solve such convoluted problems. The authors also provide an approach to solve such problems by using a Lagrangian multiplier method. Various proofs have been worked out to substantiate the work.

Details

International Journal of Quality & Reliability Management, vol. 36 no. 9
Type: Research Article
ISSN: 0265-671X

Keywords

Article
Publication date: 2 February 2015

Marco Bortolini, Emilio Ferrari, Mauro Gamberi, Riccardo Manzini and Alberto Regattieri

This paper aims to introduce, apply and validate, through a realistic case study, an analytical cost model to support the design of the tow-train feeding system for…

Abstract

Purpose

This paper aims to introduce, apply and validate, through a realistic case study, an analytical cost model to support the design of the tow-train feeding system for mixed-model assembly lines managed according to the just-in-time concept. The fleet size and inventory level, minimizing the total annual cost, are the key model goals, while the tow-train shipping capacity and the service level are the decisional variables to set.

Design/methodology/approach

The model computes the material handling, inventory and stockout rising costs of the tow-train feeding system and looks for their minimization. It further computes the expected lead time between consecutive round-trips and the Kanban card number, distinguishing among parts and assembly lines, overcoming the simplifying hypothesis assuming a constant lead time for all parts. The model is validated against a dedicated case study stressing its strengths in terms of cost and inventory-level reduction.

Findings

The proposed approach is found to be effective if compared to the standard literature in the field of Kanban system design. The 10.76 per cent cost saving is experienced for the considered case study, and the inventory level is closer to the field-experienced profile.

Practical implications

The model adopts a practical perspective, making it easy and applicable to common operative industries.

Originality/value

The literature neglects to consider the differences in the part consumption when estimating the lead time between tow-train round-trips. The proposed model overcomes such limitations and strengthens the model applicability and performances.

Details

Assembly Automation, vol. 35 no. 1
Type: Research Article
ISSN: 0144-5154

Keywords

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