liu.seSearch for publications in DiVA
Change search
Refine search result
123 101 - 116 of 116
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101.
    Selldin, Erik
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Enterprise and supply chain planning: a survey of Swedish manufacturing firms2002Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Enterprise and supply chain planning (ERP and SCP) have evolved due to the earlier benefits of manufacturing planning systems. By integrating the entire enterprise, or a part of a supply chain, the benefits sought are hopefully even greater in terms of reduced costs and increased profits in comparison with systems only managing a part of the operations. Swedish manufacturing companies are no exceptions and this research aims at investigating enterprise and supply chain planning within those firms. A descriptive study of the current situation concerning implementation and the experiences of such planning systems in both enterprise and supply chain environments is presented. Further, two explorative studies in the field of supply chain integration and supply chain design are presented. These studies examine the impact on company performance by different planning and supply chain strategies.

  • 102.
    Selldin, Erik
    Linköping University, Department of Production Economics.
    Supply chain frontier: achieving excellence in efficiency and responsiveness2004In: EurOMA 2004, Operations Management as a Change Agent,2004, Fontainebleau, Frankrike: INSEAD , 2004, p. 537-Conference paper (Refereed)
    Abstract [en]

    Design of supply chains has gained increased interest over the last years. Academics and practitioners are suggesting several different frameworks. According to Marshall L. Fisher, all supply chains have two main functions, the physical transportation of goods and the mediation of market information. Fisher suggests that a supply chain can only achieve excellence in one of the two functions. This study investigates to which extent companies have achieved high levels of efficiency and of responsiveness in their supply chains. By comparing the results from a broad sample of companies, the existence of supply chains that are efficient and responsive at the same time are studied. For each company, the supply chain for their main product is investigated. Performance of the companies in terms of financial and non-financial measures is compared to the degree of efficiency and responsiveness of the supply chain.

  • 103.
    Stefanussen Sund, Helene
    et al.
    Linköping University, Department of Production Economics.
    Österlind, Malena
    Linköping University, Department of Production Economics.
    Materialhantering och alternativa förpackningslösningar: En studie vid GETRAG All Wheel Drive AB2006Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    GETRAG All Wheel Drive AB is situated in the city of Köping, Sweden. The company develops, manufactures and supplies transmission components for the auto¬motive industry. Through project 580-9 the company is planning an assembly line for a newly developed product. For this project GETRAG wants to create a materials handling that is cost efficient, lives up to the customer demands on high quality and excludes handling of wooden pallets near the assembly line. The purpose of this thesis is therefore to suggest a cost efficient materials handling where packaging materials that give off dust or splinters are not used near the assembly line.

    To examine the questions in the thesis a study on how the support of materials to the assembly line should be handled has been made. It is based on theories of lean production and packaging logistics. The study includes an analysis of today’s flow and gives suggestions for improvements. We have also evaluated the costs and effects of replacing wooden packaging with alternative packaging materials. In addition, a survey of the market for alternative packaging materials has been made.

    The results show that to create an efficient handling of materials it is important to eliminate waste like over production, unnecessary storage and unnecessary transportations. To assure a constant flow of articles brought to the assembly line the replenishment should be equivalent to the consumption during a certain period of time, or multiples of this time, for all articles. Furthermore, the assembler should not be the one bringing materials to the assembly line; this should be done by a material handler.

    The study also shows that different packaging should be used for different articles, depending on product characteristics and where the supplier is situated. Excluding packaging material made out of wood or cardboard results in costs that must be weighed against customer demands. When it is too expensive to let the supplier deliver the articles in a packaging that does not give of dust or splinters, a repacking station is a possible solution; in the case of project 580-9 in the form of an in-house manual unpacking before the assembly.

    Our recommendation is that GETRAG All Wheel Drive AB should try to achieve a more cost efficient materials handling through lean production and six sigma and at the same time put more resources in to packaging development.

    Download full text (pdf)
    FULLTEXT01
  • 104.
    Sundin, Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Assembly technology.
    Tang, Ou
    Linköping University, Department of Production Economics.
    Mårtén, Elin
    Linköpings universitet.
    The Swedish Remanufacturing Industry - An Overview of Present Status and Future Potential2005In: CIRP Life Cycle Engineering Seminar 12th edition - 2005, Paper BM4 on the LCE-05 CD,2005, 2005Conference paper (Other academic)
  • 105.
    Tang, Ou
    Linköping University, Department of Production Economics.
    A Generalised Stockout Function for Continuous Production Variables2001In: Promet - Traffic - Trafico, ISSN 0353-5320, Vol. 13, no 6, p. 365-370Article in journal (Refereed)
  • 106.
    Tang, Ou
    Linköping University, Department of Production Economics.
    Application of Transforms in a Compound Demand Process2001In: Promet - Traffic - Trafico, ISSN 0353-5320, Vol. 13, no 6, p. 355-364Article in journal (Refereed)
  • 107.
    Wang, Qunzhi
    et al.
    Department of Industrial Engineering and Management Tokyo Institute of Technology.
    Tang, Ou
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Tsao, De-bi
    Department of Industrial Engineering and Management Tokyo Institute of Technology.
    A flexible contract strategy in a supply chain with an inflexible production mode2006In: International Journal of Operational Research, ISSN 1745-7645, Vol. 1, no 3, p. 228-248Article in journal (Refereed)
    Abstract [en]

    This paper presents a flexible supply contract with call options model for an inflexible supply chain, where the supplier only has an opportunity to produce one batch due to a long lead-time limitation. In such systems, there are eventually two decision points. At the beginning of the planning horizon, the supplier offers a wholesale price, and possibly also option purchasing and exercising prices. In addition to a firm initial order, the buyer can purchase options to adjust order quantity later. The supplier then determines the production volume. At the second decision point, with updated forecast, the buyer finalises the order quantity by exercising options. We formulate both the buyer's and the supplier's profit functions. Furthermore, we develop explicit expressions to determine the buyer's optimal decisions, and calculate the supplier's optimal decisions numerically. In numerical study, we illustrate that such a flexible contract strategy improves both the buyer's and supplier's profits. Copyright © 2006 Inderscience Enterprises Ltd.

  • 108.
    Wang, Zhiping
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Capacity-constrained production-inventory systems: using Laplace transforms and input-output analysis2001Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This work is concerned with multi-level, multi-stage capacity-constrained production-inventory problems. The aim is to provide a contribution to a theoretical background for Material Requirements Planning (MRP) using the Laplace Transform approach and Input-Output Analysis.

    In an extensive literature survey, we summarise the work on the capacitated lot-sizing problem (CLSP) within both the deterministic and the stochastic environments. Certain aspects related to model formulation are highlighted. It was found that methods for solving this class of problems have been concentrating on heuristics and mathematical programming.

    Unlike classic methods, this thesis formulates models for capacityconstrained production-inventory systems using the Laplace transform and input-output analysis. As a first step to incorporate capacity limitations into previous theory, we introduce alternative formulations of extensions to MRP theory in order to incorporate capacity constraints. We focus our attention on the way in which the fundamental balance equations for inventory and backlogs need to be modified.

    Then we develop a stochastic model, in which external demand for end items is assumed to be unknown. Unlike the classic total cost objective function, the Net Present Value is used as the objective function. As an intermediate result, the backlog function for a discrete time demand process is derived. Besides, an extension of the model is presented in which both capacity and demand are considered along a continuous time scale, without time buckets.

    Numerical examples are provided to explain the theory both in the deterministic and in the stochastic situations.

  • 109.
    Wikner, Joakim
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Analysis of smoothing techniques: Application to production-inventory systems2006In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 35, no 9, p. 1323-1347Article in journal (Refereed)
    Abstract [en]

    Purpose - To provide an overview of how a number of frequently used smoothing-based forecasting techniques can be modelled for use in dynamic analysis of production-inventory systems. Design/methodology/approach - The smoothing techniques are modelled using transfer functions and state space representation. Basic control theory is used for analysing the dynamic properties. Findings - A set of expressions are derived for the smoothing techniques and dynamic properties are identified. Practical implications - Dynamic properties are important in many applications. It is shown that the different smoothing techniques can have very different influences on the dynamic behaviour and therefore should be considered as a factor when smoothing parameters are decided on. Originality/value - Dynamic behaviour of production-inventory systems can be analysed using control theory based on, e.g. transfer functions or state space models. In this paper a set of models for five common smoothing techniques are analysed and their respective dynamic properties are highlighted. © Emerald Group Publishing Limited.

  • 110.
    Wikner, Joakim
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Continuous-time dynamic modelling of variable lead times2003In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 41, no 12, p. 2787-2798Article in journal (Refereed)
    Abstract [en]

    Dynamic modelling of production-inventory systems usually involves lead time models since this is one of the most important aspects of these systems. Many different models are possible and this paper presents an overview and some ideas for how the models may be interpreted. Three different approaches to continuous-time dynamic modelling of variable lead times based on Control Theory are discussed. Two of the models can easily be incorporated into linear models based on the Laplace transform. The models are shown to be three instances of a generic delay model, which by careful selection of two parameters can be adapted to a wide variety of systems. Also the relation between waiting line theory concepts and the generic delay model is analysed, establishing an interpretation of the models as generating the concept of expected dynamic behaviour.

  • 111.
    Wikner, Joakim
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Dynamic analysis of a production-inventory model2005In: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 34, no 6, p. 803-823Article in journal (Refereed)
    Abstract [en]

    Purpose - A production-inventory system based on a model proposed by Axsäter is examined with the purpose of understanding the dynamic properties of the model. Design/methodology/approach - The information flow concept is discussed and a dynamic analysis using a system simplification approach is carried out to achieve an understanding of the dynamic behaviour of the system. Finally, the information flow is examined and analysed from a hierarchical perspective. Findings - The model is extended to include an order decision rule and a production unit and it is shown that the extended model has the capability to represent the dynamics of a number of different system management principles. The three different model instances of base stock, kanban and material requirements planning character are analysed. Originality/value - Dynamic modelling of production-inventory and supply chain models are usually analysed at an aggregate level not involving any complex relations of materials or capacities. In this paper, this line of research is merged with an approach based on multiple information channels using matrix representation and it is shown how a system simplification approach can be used for this purpose. © Emerald Group Publishing Limited.

  • 112.
    Wikner, Joakim
    et al.
    School of Engineering Jönköping University.
    Naim, Mohammed M.
    Logistics Systems Dynamics Group Cardiff University.
    Rudberg, Martin
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Exploiting the order Book for Mass Customized Manufacturing Control Systems With CApacity Limitations2007In: IEEE transactions on engineering management, ISSN 0018-9391, E-ISSN 1558-0040, Vol. 54, p. 145-155Article in journal (Refereed)
  • 113.
    Wikner, Joakim
    et al.
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Rudberg, Martin
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Integrating production and engineering perspectives on the customer order decoupling point2005In: International Journal of Operations & Production Management, ISSN 0144-3577, E-ISSN 1758-6593, Vol. 25, no 7, p. 623-641Article in journal (Refereed)
  • 114.
    Wikner, Joakim
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Rudberg, Martin
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Introducing a customer order decoupling zone in logistics decision-making2005In: International Journal of Logistics, ISSN 1367-5567, E-ISSN 1469-848X, Vol. 8, no 3, p. 211-224Article in journal (Refereed)
  • 115.
    Zhou, Li
    et al.
    Cardiff Business School Cardiff University.
    Naim, Mohamed
    Cardiff Business School Cardiff University.
    Tang, Ou
    Linköping University, The Institute of Technology. Linköping University, Department of Production Economics.
    Towill, Denis
    Cardiff Business School Cardiff University.
    Dynamic performance of a hybrid inventory system with a Kanban policy in remanufacturing process2006In: Omega, ISSN 0030-2228, E-ISSN 1541-3764, Vol. 34, no 6, p. 585-598Article in journal (Refereed)
    Abstract [en]

    In this paper we study a hybrid system with both manufacturing and remanufacturing. The inventory control strategy we use in the manufacturing loop is an automatic pipeline, inventory and order based production control system (APIOBPCS). In the remanufacturing loop we employ a Kanban policy to represent a typical pull system. The methodology adopted uses control theory and simulation. The aim of the research is to analyse the dynamic (as distinct from the static) performance of the specified hybrid system. Dynamics have implications on total costs in terms of inventory holding, capacity utilisation and customer service failures. We analyse the parameter settings to find preferred "nominal", "fast" and "slow" values in terms of system dynamics performance criteria such as rise time, settling time and overshoot. Based on these parameter settings, we investigate the robustness of the system to changes in return yield and the manufacturing/remanufacturing lead time. Our results clearly show that the system is robust with respect to the system dynamics performance and the remanufacturing process can help to improve system dynamics performance. Thus, the perceived benefits of remanufacturing of products, both environmentally and economically, as quoted in the literature are found not to be detrimental to system dynamics performance when a Kanban policy is used to control the remanufacturing process. © 2005 Elsevier Ltd. All rights reserved.

  • 116.
    Östman, Fredrik
    Linköping University, Department of Production Economics.
    Styrning av råvarulager och förbättrat materialflöde2004Independent thesis Basic level (professional degree)Student thesis
    Abstract [sv]

    Detta examensarbete är utfört vid Ahlstrom Cores AB som tillverkar spirallindade pappershylsor vid tre anläggningar i Sverige. Pappershylsor används främst vid tillverkning av papper av olika kvalitéer och företagets kunder använder då hylsorna till att linda upp det färdiga pappret på. Råvaror vid tillverkningen är hylskartong av olika kvalitéer och bredder samt lim. Rapporten behandlar två separata uppgifter. Den första och större av de två är att utforma ett nytt system för styrning av råvarulager och den andra är att förbättra materialflödet vid en av företagets anläggningar.

    I dagsläget saknar företaget regler för när och i vilka mängder råmaterial ska köpas in. Detta föranleder företaget att tro att man skulle kunna minska sina lager utan att för den skull minska sin servicegrad. Samtliga slutprodukter produceras efter ett recept som specificerar hur en slutprodukt byggs upp. Rapporten visar hur företaget utifrån ett givet produktionsschema och samlingen av recept kan beräkna sitt materialbehov för den kommande tidsperioden. Rapporten drar också slutsatsen att företaget bör använda partiformningsmetoden Lot-for-lot för samtliga sina råmaterial utom två. Att dessa två råmaterial inte kan styras på samma sätt som de övriga beror på att dessa materials förbrukning varierar mycket mot den som beskrivs i recepten. För de två materialen rekommenderas att beställningspunktsystem används för den ena och återfyllnadsnivå för den andra. En beräkning visar att det nya lagerstyrningssystemet kommer att minska företagets råvarulagrer med cirka 45 %.

    För materialflödesproblemet vid en av anläggningarna ger rapporten ett antal åtgärdsförslag som samtliga har det gemensamt att inga större investeringar kommer att krävas för att genomföra dem. Bland dessa åtgärdsförslag kan nämnas en ny disposition av företagets råvaru- och färdigvarulager. Denna nya disposition syftar till att minska längden på de interna materialtransporterna. Rapporten ger också ett förslag på hur råvarulagren ska organiseras och rekommenderar att en större maskin flyttas inom anläggningen. Detta genomförs framförallt för att bättre kunna utnyttja en yta som idag knappt används, samtidigt som denna maskin med dagens placering tar upp mer plats än vad som kan anses nödvändigt. Övergripande för åtgärderna vid anläggningen är att ingen exakt bedömning av hur stor förbättring åtgärderna innebär har gjorts, utan rapporten nöjer sig med att konstatera att det blir bättre.

    Download full text (pdf)
    FULLTEXT01
123 101 - 116 of 116
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf