| 1. |
- Al-Najjar, Basim, 1954-, et al.
(författare)
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Selecting the Most Efficient Maintenance Approach Using Fuzzy Multiple Criteria Decision Making
- 2003
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 84:1, s. 85-100
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Tidskriftsartikel (refereegranskat)abstract
- We assess the most popular maintenance approaches, i.e. strategies, policies, or philosophies, using a fuzzy multiple criteria decision making (MCDM) evaluation methodology. We illustrate with two examples how the suggested evaluation methodology identifies the most informative approach. Using the fuzzy MCDM, it would be possible to select in advance, the most informative (efficient) maintenance approach. Consequently, this leads to less planned replacements, and failures would be reduced to approximately zero and higher utilization of component life can be achieved. Thus, the maintenance department could contribute more to the business objectives throughout participating effectively in adding value to the production activities.
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| 2. |
- Agrell, Per J., et al.
(författare)
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A Coherent Methodology for Productivity Analysis Employing Integrated Partial Efficiency
- 1996
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 46-47, s. 401-411
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Tidskriftsartikel (refereegranskat)abstract
- An activity decomposition methodology with theoretical foundation in the principles of activity control and stated focus of interest in the enterprise value-chain is presented. Characteristics of inputs and outputs are discussed, where a set of non-transformable inputs are defined and motivated. An integrated partial efficiency measure is formulated, compensating for some weaknesses of the Debreu-Farrell technical efficiency concept. Providing a coherent basis for productivity analysis, the IPE approach poses an alternative to e.g. DEA especially in the case of multi-level systems and sparse data. The method is easily communicable in terms of measurement and analysis, and may be extended to complement economic performance assessments and benchmarks.
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| 3. |
- Agrell, Per, J., et al.
(författare)
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An MCDM Framework for Dynamic Systems
- 1996
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Ingår i: International Journal of Production Economics. - : Elsevier BV. - 0925-5273 .- 1873-7579. ; 45:1-3, s. 279-292
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Tidskriftsartikel (refereegranskat)abstract
- A multi-criteria formulation for continuous and discrete-time dynamic systems is presented. The fundamental problem in the design of dynamic systems is the trade-off between response speed (e.g., the time to reach final value and the raise time) and response smoothness (e.g., the overshoot, the undershoot, and the transient dampening). Separate optimisation of criteria is impossible, thus the problem is inherently multiobjective. In a general dynamic system, this is accomplished by adjusting a number of technical parameters in accordance with some ad hoc practice. Previous multi-criteria approaches have been modelled as weighted sums of criteria, with shortcomings in terms of sensitivity analysis and preference articulation. The proposed framework enables the decision maker to design a most preferred system, with full knowledge of local trade-off ratios in terms of chosen criteria. Combining analytical techniques with simulation, the formulation makes the optimisation process transparent to the decision maker, working entirely in decision space. The framework is demonstrated on a dynamic production-inventory model.
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| 4. |
- Aguilar Sommar, Ruth
(författare)
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Business process modelling : Review and framework
- 2004
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 90:2, s. 129-149
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Tidskriftsartikel (refereegranskat)abstract
- A business process is the combination of a set of activities within an enterprise with a structure describing their logical order and dependence whose objective is to produce a desired result. Business process modelling enables a common understanding and analysis of a business process. A process model can provide a comprehensive understanding of a process. An enterprise can be analysed and integrated through its business processes. Hence the importance of correctly modelling its business processes. Using the right model involves taking into account the purpose of the analysis and, knowledge of the available process modelling techniques and tools. The number of references on business modelling is huge, thus making it very time consuming to get an overview and understand many of the concepts and vocabulary involved. The primary concern of this paper is to make that job easier, i.e. review business process modelling literature and describe the main process modelling techniques. Also a framework for classifying business process-modelling techniques according to their purpose is proposed and discussed. © 2003 Elsevier B.V. All rights reserved.
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| 5. |
- Alnestig, Peter, et al.
(författare)
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Product costing in ten Swedish manufacturing companies
- 1996
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Ingår i: International Journal of Production Economics. - : Elsevier BV. - 0925-5273 .- 1873-7579. ; 46-47, s. 441-457
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the main results from case studies in 10 Swedish manufacturing companies concerning their product costing. The main purpose of the study is to find out what models of product costing the companies use, what allocation bases are applied. Several questions have been asked to the companies: What is the purpose of the product costing? Is a special product costing used for inventory valuation? Is full costing or variable costing used? How are depreciation costs and cost of capital treated? Is some sort of activity-based costing used? If so, which arethe cost drivers? The study is a case analysis, no questionnaires are used. The study presents arguments that a separation of product costing in “Activity-Based Costing” or “traditional costing” is not possible, but also that more “ABC-thinking” is necessary.
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| 6. |
- Axsäter, Sven, et al.
(författare)
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Approximating general multi-echelon inventory systems by Poisson models
- 1994
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Ingår i: International Journal of Production Economics. - : Elsevier BV. - 0925-5273 .- 1873-7579. ; 35:1-3, s. 201-206
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Tidskriftsartikel (refereegranskat)abstract
- We consider a continuous review two-level inventory system with a central warehouse and a number of retailers. The demand processes at the retailers are different compound Poisson processes. We present and evaluate an approximate optimization technique, where the real demand is replaced by "equivalent" Poisson demand such that the ratio between mean and standard deviation is the same as for the real distribution. The solution of the Poisson model is then scaled back to the original problem.
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| 7. |
- Axsäter, Sven, et al.
(författare)
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Comparison of Echelon Stock and Installation Stock Policies for Two-Level Inventory Systems
- 1996
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Ingår i: International Journal of Production Economics. - : Elsevier BV. - 0925-5273 .- 1873-7579. ; 45:1-3, s. 303-310
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Tidskriftsartikel (refereegranskat)abstract
- It is previously known that echelon stock reorder point policies dominate installation stock reorder point policies for serial and assembly multi-level inventory systems. This paper presents worst-case results for the relative cost difference in case of constant demand and no backorders. Furthermore, we analyze distribution systems with stochastic demand by simulation. Depending on the structure of the system either echelon stock or installation stock policies may be advantageous.
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| 8. |
- Axsäter, Sven, et al.
(författare)
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Comparison of echelon stock and installation stock policies with policy adjusted order quantities
- 1997
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 48:1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- Echelon stock and installation stock reorder point policies for multi-level inventory control have been compared in previous studies. It is known that echelon stock policies dominate installation stock policies for serial and assembly systems. Earlier comparisons assume that both policies use the same given order quantities, while each policy is optimized with respect to its reorder points. This paper presents worst case results for the cost ratio when the order quantities can be optimized for each policy.
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| 9. |
- Bengtsson, Jens
(författare)
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Manufacturing flexibility and real options : A review
- 2001
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 74:1-3, s. 213-224
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Forskningsöversikt (refereegranskat)abstract
- This paper considers manufacturing flexibility and real options from an industrial engineering/production management perspective. Real options papers are related to different types of manufacturing flexibility in order to show which types that are considered and in what way they are considered. Flexibility types not valued with real options and real options without any corresponding manufacturing flexibility type are identified and discussed. © 2001 Elsevier Science B.V. All rights reserved.
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| 10. |
- Bengtsson, Jens, 1973-, et al.
(författare)
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Valuation of product-mix flexibility using real options
- 2002
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Ingår i: International Journal of Production Economics. - 0925-5273 .- 1873-7579. ; 78:1, s. 13-28
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Tidskriftsartikel (refereegranskat)abstract
- Flexibility in manufacturing operations is becoming increasingly more important to industrial firms, due to e.g., increasing market demand volatility, internationalisation of markets and competition, and shorter product life cycles. Defining, measuring and evaluating manufacturing flexibility have not been straightforward - neither in theory nor in practice. The use of real options has shown to be an accessible approach for the valuation of certain types of flexibility. When using real options for capital budgeting purposes it is possible to take flexibility options into account in the valuation process. In this paper, we use real options to evaluate one specific type of manufacturing flexibility, i.e., product-mix flexibility. We provide both theoretical and practical perspectives, based on a real case. The main interest of the company under study is to evaluate product-mix flexibility with respect to capacity, set-ups, level of automation and multi-functionality of resources. The case involves multiple products and demand uncertainty, wherefore product demands are used as the underlying asset in the real options models. Thus, the contribution of this paper concerns the combination of real case, multiple products, capacity constraints, and set-up costs. The results of the analysis show that (i) the value of flexibility decreases when demand volatility increases, (ii) flexible resources add substantial value as compared to dedicated resources, and (iii) the flexibility value of marginal capacity decreases with increasing levels of capacity.
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