| 1. |
- Johansson, Johan, et al.
(författare)
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Production planning in process industries
- 2011
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Purpose of this paperThe purpose is to map the production planning process in process industries and analyze how it is related to their specific planning conditions and available literature. Further on the research aim at detecting similarities and differences in production planning at tactical level.Design/methodology/approachThe research methodology has an embedded multi-case design with focus on planning processes involving several entities within the companies. Information sources are documentation and interviews.FindingsProcess industries with different structures and conditions plan production differently. For instance a difference has been found between how material dominated companies plan compared to capacity dominated ones.Research limitations/implicationsFocus in this research has been on production planning at tactical level and therefore the strategic and operational level has mainly been left out of the study.What is original/value of paperThe research gives insights in production planning processes for process industries and presents ideas on why the different production planning processes are designed as they are according some specific conditions.
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| 2. |
- Johansson, Johan, et al.
(författare)
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Production planning in process industries
- 2012
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Purpose of this paperThe purpose is to map the production planning process in process industries and analyze how it is related to their specific planning conditions and relevant current literature. Further on the research aims at detecting similarities and differences in production planning at tactical level.Design/methodology/approachThe research methodology has a holistic multi-case design with focus on planning processes involving several entities within the companies. Information sources are documentation and interviews.FindingsProcess industries with different structures and conditions plan production differently. For instance a difference has been found between how material dominated companies plan compared to capacity dominated ones.Research limitations/implicationsFocus in this research has been on production planning at tactical level and therefore the strategic and operational level has mainly been left out of the study.What is original/value of paperThe research gives insights in production planning processes for process industries and presents ideas on why the different production planning processes are designed as they are according some specific conditions.
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| 3. |
- Feldmann, Andreas, 1981-, et al.
(författare)
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Höstkonferensen 2006
- 2006
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Ingår i: Produktionsstrategi. ; 2:4
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 4. |
- Guajardo, Mario, et al.
(författare)
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Joint optimization of pricing and planning decisions in divergent supply chain
- 2013
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Ingår i: International Transactions in Operational Research. - : Wiley-Blackwell. - 0969-6016 .- 1475-3995. ; 20:6, s. 889-916
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Tidskriftsartikel (refereegranskat)abstract
- In divergent supply chains, such as in the oil industry, processing raw materials results in an outflow of multiple products. Final products are stored at international depots, from where they are ready to be shipped to the markets. Even if one company controls the entire chain, when production and sales organizations are decoupled, a relevant problem is to determine the internal prices of products at depots for achieving coordination. We propose an optimization model involving pricing and production decisions, and several constraints commonly used in divergent chains. In our approach, the producer incorporates the sellers behavior by expressing demand as a function of the internal price. As a result, our model serves as a coordination mechanism in trying to get an overall coordinated integrated solution in a decoupled reality. Numerical examples in single and multiple periods problems show the advantages of our approach over cost-based methods.
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| 5. |
- Guajardo, Mario, et al.
(författare)
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Speciality oils supply chain optimization: From a decoupled to an integrated planning approach
- 2013
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Ingår i: European Journal of Operational Research. - : Elsevier. - 0377-2217 .- 1872-6860. ; 229:2, s. 540-551
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Tidskriftsartikel (refereegranskat)abstract
- We study a problem of tactical planning in a divergent supply chain. It involves decisions regarding production, inventory, internal transportation, sales and distribution to customers. The problem is motivated by the context of a company in the speciality oils industry. The overall objective at tactical level is to maximize contribution and, in order to achieve this, the planning has been divided into two separate problems. The first problem concerns sales where the final sales and distribution planning is decentralized to individual sellers. The second problem concerns production, transportation and inventory planning through refineries, hubs and depots and is managed centrally with the aim of minimizing costs. Due to this decoupling, the solution of the two problems needs to be coordinated in order to achieve the overall objective. In the company, this is pursued through an internal price system aiming at giving the sellers the incentives needed to align their decisions with the overall objective. We propose and discuss linear programming models for the decoupled and integrated planning problems. We present numerical examples to illustrate potential effects of integration and coordination and discuss the advantages and disadvantages of the integrated over the decoupled approach. While the total contribution is higher in the integrated approach, it has also been found that the sellers contribution can be considerably lower. Therefore, we also suggest contribution sharing rules to achieve a solution where both the company and the sellers attain a better outcome under the integrated planning.
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| 6. |
- Kylinger, Martin
(författare)
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Supply chain coordination using optimal transfer pricing to balance co- and byproduct demand within a process industry
- 2014
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Process industries has for long been important for the development of Swedish industry and society. All industries face different conditions that affect how to best run their operations. This thesis aims to describe some of the conditions that characterize process industries compared to other industries. Further one of these characteristics has been studied more closely.One of the traits of process industries is that they are positioned at the start of the transformation process close to the raw material mixing, separating or forming it into products often used for further transformation. Process industries hence become dependent on the properties of these materials. One of the most prominent characteristics inherent from the raw material properties is the divergent bill of material. The divergent bill of material originates from the fact that a given raw material is made up of different components that will yield several products with different characteristics when processed. When splitting the raw material into the desired products the yielded products from a certain raw material usually have different value to the producer, some more desired than others. These multiple products generated poses a challenge from a planning perspective raising questions like “How should we balance the supply and demand of all the products produced?”, “What shall we do with the excess products produced?”.The first paper in this thesis describe the production planning in four Swedish process industries with the ultimate aim to connect their planning to the supply chain characteristics they face as process industries. The study concludes that the industry specific conditions mainly affect planning at short time ranges when planning becomes more detailed. In general the use of planning or decision support systems is low, stemming from a, warranted or not, belief that general decision support systems do not fit process industries. Another finding is that the case companies mainly operate in niche markets. This study also highlighted that the planning complexity arising from characteristic of co- and by-product generation in combination with the lack of decision support systems requires further studies.The subsequent two papers focus on supply chain planning and coordination with a divergent bill of material. They present a mathematical model over the supply chain planning in a real case company in the specialty oils industry. The second paper investigates transfer pricing as a coordination tool by comparing decentralised supply chain planning with centralized planning in an integrated model. Transfer pricing is found to have a potential positive effect on supply chain planning while simultaneously creating problems in terms of uneven distribution of the contribution margin among supply chain partners.Finally the third paper more closely investigates different ways to set transfer prices and comparing them to the optimal transfer prices. Setting optimal transfer prices with a divergent bill of material has proven to be less straightforward than the case with no dependencies between products. Some optimal transfer prices could even be set lower than the marginal cost for producing them due to the dependency between the products in the divergent bill of material. This indicates that there is an opportunity cost for a product that is dependent on the demand of other products.
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