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Article
Publication date: 10 August 2012

Jia‐Yen Huang

It is not uncommon that a multi‐branch firm has all its branches maintaining the same group of machines from a maintenance department. Clearly there are potential…

Abstract

Purpose

It is not uncommon that a multi‐branch firm has all its branches maintaining the same group of machines from a maintenance department. Clearly there are potential opportunities to reduce costs by coordinating the joint maintenance among the branches. The purpose of this paper is to optimally coordinate the maintenance schedule of machines of multi‐branch firms to save the maintenance cost incurred.

Design/methodology/approach

A search algorithm is proposed that proceeds the searching through the junction points within the lower and upper bounds of the search range. An example is given to illustrate the method.

Findings

The optimality structure of this problem is explored and it is asserted that the optimal cost is piece‐wise convex. Based on theoretical results, an effective search algorithm is derived that can efficiently determine the maintenance frequencies for a family of machines of multi‐branch firm.

Practical implications

A well‐planned maintenance schedule can not only bring down the cost but also raise the utilization rate of a family of machines. Numerical results show that the whole maintenance system can obtain significant cost savings from the coordination policy.

Originality/value

In response to branches adopting coordinated maintenances, the maintenance manager providing the maintenances to the branches faces a scheduling problem of how to minimize its total costs. This is an area that has received little attention in the literature. By utilizing the theoretical results, an efficient search algorithm that solves the optimal solution for this problem is proposed.

Details

Journal of Quality in Maintenance Engineering, vol. 18 no. 3
Type: Research Article
ISSN: 1355-2511

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Article
Publication date: 1 January 1988

Yasemin Aksoy and S. Selcuk Erenguc

In a multi‐item environment with a joint set‐up cost structure considerable savings may be realised by co‐ordinating the replenishments. This article presents a unified…

Abstract

In a multi‐item environment with a joint set‐up cost structure considerable savings may be realised by co‐ordinating the replenishments. This article presents a unified survey of the inventory control literature designed to capture the models that fit in this frame. In general these models are complex and require a great deal of computational effort to obtain an exact solution. The literature relies mainly on heuristic procedures.

Details

International Journal of Operations & Production Management, vol. 8 no. 1
Type: Research Article
ISSN: 0144-3577

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Article
Publication date: 1 December 1993

S.K. Goyal, A. Gunasekaran, T. Martikainen and P. Yli‐Olli

Presents a mathematical model for determining Economic ProductionQuantity (EPQ) in a multistage flow‐shop production system for the casewhere the demand for items per unit…

Abstract

Presents a mathematical model for determining Economic Production Quantity (EPQ) in a multistage flow‐shop production system for the case where the demand for items per unit time is deterministic and the planning horizon is finite. Solves an example problem to illustrate the model.

Details

International Journal of Operations & Production Management, vol. 13 no. 12
Type: Research Article
ISSN: 0144-3577

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Article
Publication date: 1 January 1992

Suresh K. Goyal and S.G. Deshmukh

Gives a critical review of the existing literature on just‐in‐timemanufacturing. Suggests a relevant literature classification scheme,followed by subsections on each class…

Abstract

Gives a critical review of the existing literature on just‐in‐time manufacturing. Suggests a relevant literature classification scheme, followed by subsections on each class and offers critical comments. Also identifies the possible research portfolios after an explanation of the gap existing between theory and practice.

Details

International Journal of Operations & Production Management, vol. 12 no. 1
Type: Research Article
ISSN: 0144-3577

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Article
Publication date: 1 July 1994

Moncer Hariga

Addresses a deterministic maintenance‐scheduling problem for a group ofnon‐identical machines. The problem is formulated as a mixed integernon‐linear program which is…

Abstract

Addresses a deterministic maintenance‐scheduling problem for a group of non‐identical machines. The problem is formulated as a mixed integer non‐linear program which is approached heuristically. In the model formulation, it is assumed that a major overhaul brings the machine back to its new condition, whereas a minor overhaul restores it to a specified operating condition. An iterative solution procedure is developed to obtain a near‐optimal cyclic overhaul schedule. Presents a worked example to illustrate the proposed solution method.

Details

International Journal of Operations & Production Management, vol. 14 no. 7
Type: Research Article
ISSN: 0144-3577

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Article
Publication date: 13 February 2017

Valdecy Pereira and Helder Gomes Costa

This paper aims to present a set of five models for the economic order quantity problem. Four models solve problems for a single product: incremental discounts with or…

Abstract

Purpose

This paper aims to present a set of five models for the economic order quantity problem. Four models solve problems for a single product: incremental discounts with or without backorders and all-unit discounts with or without backorders, and the last model solves problems for the multiproduct case.

Design/methodology/approach

A basic integer non-linear model with binary variables is presented, and its flexible structure allows for all five models to be utilised with minor modifications for adaptation to individual situations. The multiproduct model takes into consideration the work of Chopra and Meindl (2012), who studied two types of product aggregations: full and adaptive. To find optimal or near-optimal solutions for the multiproduct case, the authors propose a simulated annealing metaheuristic application. Numerical examples are presented to improve the comprehension of each model, and the authors also present the efficiency of the simulated annealing algorithm through an example that aggregates 50 products, each one with different discount schemes and some allowing backorders.

Findings

Our model proved to be efficient at finding optimal or near optimal solutions even when confronted with mathematical complexities such as the allowance of backorders and incremental discounts.

Originality/value

Finally our model can process a mix of products with different discount schemes at the same time, and the simulated annealing metaheuristics could find optimal or near optimal solutions with very few iterations.

Details

Journal of Modelling in Management, vol. 12 no. 1
Type: Research Article
ISSN: 1746-5664

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Article
Publication date: 29 June 2012

Nita H. Shah, Ajay S. Gor and Chetan A. Jhaveri

The purpose of this paper is to study integrated inventory system and pricing and ordering strategy for vendor‐buyer supply chain system. Here, the vendor offers a trade…

Abstract

Purpose

The purpose of this paper is to study integrated inventory system and pricing and ordering strategy for vendor‐buyer supply chain system. Here, the vendor offers a trade credit to the buyer when the buyer's order quantity exceeds a given pre‐specified quantity. Therefore, to incorporate the concept of vendor‐buyer integration and trade credit linked, the authors analyze the model to determine the optimal strategy for an integrated vendor‐buyer inventory system under the condition of credit linked to the order quantity when demand is quadratic.

Design/methodology/approach

A mathematical model for integrated inventory system is developed when demand rate is increasing function of the time and decreasing function of the retail price. By analyzing the total channel profit function, the authors developed some useful results to characterize the optimal solution and provide an iterative algorithm to find the retail price, buyer's order quantity and the number of shipments per production run from the vendor to the buyer.

Findings

By developing a solution algorithm, the optimal retail price, order quantity and number of shipments from the vendor to the buyer are provided. Numerical examples and sensitivity analyses are presented to validate the proposed model. Through extensive numerical analyses, it is observed that a longer credit term increases profits of the player for the entire supply chain. The vendor should establish the threshold for allowing trade credit comprehensively to ensure the greatest benefit for both players.

Originality/value

Most of the research articles available in the literature considered the constant demand or linearly changing demand. In this paper, a mathematical model is developed considering time dependent quadratic demand. Very few researchers have investigated joint optimal policy in vendor‐buyer supply chain system, considering trade credit is linked to order quantity, and still there are not many findings on the benefit of integrated policy and trade credit.

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Article
Publication date: 10 June 2020

Abu Hashan Md Mashud, Hui-Ming Wee, Biswajit Sarkar and Yu-Hua Chiang Li

This paper aims to consider a sustainable inventory model with price dependent demand, non-instantaneous deterioration rate, discount facility, partially backlogged…

Abstract

Purpose

This paper aims to consider a sustainable inventory model with price dependent demand, non-instantaneous deterioration rate, discount facility, partially backlogged shortages and advance and delay in payments for a two-warehouse system.

Design/methodology/approach

This model considered a non-instantaneous deterioration, which starts after a certain period with a constant rate. The deterioration rate in the rented warehouse is more compared to own warehouse. The proposed model focused on two things. The first one is to the benefits of the advance payments strategy and delayed payment for the retailer and supplier, where the two-warehouse system is available and the second one is using an appropriate discount facility on no of the installment to maximize the total profit. The classical optimization technique is used to solve the problem.

Findings

The combination of trade-credits and advance payments is initiated to provide more benefits to the retailer. The findings prove that advance payments, which are received from the retailer to the supplier are beneficial for the supplier, who can influence the demand increase because of higher lower selling prices. Decreasing the selling price is used as a catalyst to increase demand. It also extends the discount concept of Khan et al. (2019, 2019b).

Research limitations/implications

This model is limited by the fact that it does not consider variable deterioration. Therefore, the proposed inventory model could be extended by considering variable deterioration, as well as fully backlogged shortages and time-dependent demand function.

Originality/value

The study simultaneously considers a non-instantaneous deterioration inventory model, advance-payment, trade-credit for a sustainable two-warehouse inventory system. From the literature search to the best of knowledge no researcher has undergone this sort of study.

Details

Kybernetes, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0368-492X

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Article
Publication date: 1 March 1989

S.K. Goyal and S. Singhal

A corrected attempt to determine the size of in‐process inventoryand the manufacturing lead time for an n‐stage production system ismade. This corrects the earlier model…

Abstract

A corrected attempt to determine the size of in‐process inventory and the manufacturing lead time for an n‐stage production system is made. This corrects the earlier model developed by Ornek and Collier by accurately deriving the model for determining the manufacturing cycle time.

Details

International Journal of Operations & Production Management, vol. 9 no. 3
Type: Research Article
ISSN: 0144-3577

Keywords

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Article
Publication date: 1 April 1989

J.S. Dagpunar

This paper shows how to obtain an optimal inventory managementpolicy, subject to an investment constraint, when different items areordered from the same supplier. It is…

Abstract

This paper shows how to obtain an optimal inventory management policy, subject to an investment constraint, when different items are ordered from the same supplier. It is shown that the optimal policy for this constrained problem may be obtained directly from the solution to the equivalent unconstrained problem.

Details

International Journal of Operations & Production Management, vol. 9 no. 4
Type: Research Article
ISSN: 0144-3577

Keywords

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