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Article
Publication date: 16 August 2011

Carles Sitompul and El‐Houssaine Aghezzaf

The purpose of this study is to propose and formulate an integrated hierarchical production, and maintenance‐planning model.

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Abstract

Purpose

The purpose of this study is to propose and formulate an integrated hierarchical production, and maintenance‐planning model.

Design/methodology/approach

The proposed model is formulated mathematically and tested for some hypothetical cases. A two‐level planning is proposed to address the hierarchical planning problem, i.e. aggregate planning and detailed planning. A preventive maintenance planning is integrated into the aggregate planning, while machine breakdowns, which require corrective maintenance actions, are investigated in the detailed planning. The proposed general preventive maintenance model is tested against cyclical preventive maintenance models for some cases, and for evaluating the performance of the models, in terms of costs, and service levels.

Findings

The proposed general preventive maintenance model gives a better solution in terms of cost than the cyclical maintenance model (i.e. 6 per cent less costly), if the maintenance planning is executed separately from the production planning. In terms of service level, however, both models perform equally well with average service levels equal to 97.6 per cent. The effect of tight capacity, long maintenance duration, and small machine parameters similarly tightens the capacity. In these cases, it is shown that a stable level of capacity is more beneficial to achieve a better service level, which is gained if the preventive maintenance actions are carried out monthly.

Practical implications

At the aggregate level, the proposed preventive maintenance model considers a non‐cyclical planning, which means that the preventive maintenance periods do not necessarily fall at equally distant times. The inventory movement constraints at the aggregate level decouple machines to operate independently; hence the detailed level problem can be solved separately for each machine. In a rolling horizon approach, only the first period of the aggregate plan is implemented and disaggregated into the production of items at the detailed level.

Originality/value

The paper proposes an integrated model of hierarchical production and maintenance planning. A general preventive maintenance is integrated into the aggregate planning, while machine breakdowns are investigated in the detailed planning. To the best of one's knowledge, such a hierarchical view of production planning and maintenance has not been addressed adequately.

Details

Journal of Quality in Maintenance Engineering, vol. 17 no. 3
Type: Research Article
ISSN: 1355-2511

Keywords

Article
Publication date: 19 October 2015

Sarah Elsaid and El-Houssaine Aghezzaf

This purpose of this paper is concerned with the issue of designing and operating a sustainable waste management system, in rapidly growing urban areas. Some existing models for…

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Abstract

Purpose

This purpose of this paper is concerned with the issue of designing and operating a sustainable waste management system, in rapidly growing urban areas. Some existing models for waste management and the extent to which they could be applied in a specific environment – Cairo for example – are discussed. An integrated framework which can serve as a basis for the development of a sustainable waste management system is proposed. Sustainability of the system, opportunities and challenges, material re-use and recycling, composting, incineration and energy production and land-filling are examined. Relevant waste management and cost sub-models inherent to the system are discussed. In addition, some other environmental and social aspects are also debated. The main focus of this paper is to provide some insights into the design of a more effective and integrated sustainable waste management system applicable for developing economies.

Design/methodology/approach

An in-depth analysis is carried out for the existing models and approaches for waste management. This has led to the development of a framework which can be implemented.

Findings

A comprehensive conceptual framework for a waste management system is developed. The major inputs and expected outputs are clearly identified.

Originality/value

A comprehensive and complete system for waste management is proposed. This system can be operationalized and implemented with a view of sustainability.

Details

Management Research Review, vol. 38 no. 10
Type: Research Article
ISSN: 2040-8269

Keywords

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