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  • 1.
    Björklund, Stefan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Bjurstam, Peter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Novak, Arne
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Compensation of systematic errors in five-axis high-speed machining2002In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 40, no 15 SPEC., p. 3765-3778Article in journal (Refereed)
    Abstract [en]

    A method is described for the compensation of errors associated with tool path generation, particularly during five-axis high-speed machining (HSM). Information on machine tool performance and its dynamic features is used to calculate possible errors and convenient modifications of the NC program, thereby avoiding errors when parts are actually being machined. This 'preprocess method' by means of postprocessing with NC software is presented. The errors dealt with are mainly servo lag errors, but the explored approach can support most systematic errors associated with machine tool performance. These are briefly summarized. Research so far has largely been aimed at the implementation of compensation routines in the CNC controller and at corrections in real time. The problem is that most applications are only available for three-axis milling. The presented approach (compensation before machining by using software routines in a specially designed postprocessor) is based on a fuzzy logic expert system. The benefits can be summarized as data reduction, data improvement, precontrol of feed, and improved component accuracy. The applied procedure is also convenient for implementation in an industrial environment by retrofitting existing equipment. The suggested method provides improved control over machine dynamics, permitting high-speed machining centres to maintain a maximum or near-maximum feed rate despite axis reversals and tool path changes, even at corners. Two categories of results are presented, namely the management of NC data related to expected performance of the machine tool and improvements of the machine tool performance in terms of productivity and accuracy of the machined test components.

  • 2.
    Disney, S. M.
    et al.
    Cardiff University.
    Grubbström, Robert W.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Economic consequences of a production and inventory control policy2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 17, p. 3419-3431Article in journal (Refereed)
    Abstract [en]

    The economic performance of a generalized Order-Up-To policy is investigated in response to an Auto Regressive stochastic demand process. Focus is on the case where the physical production/distribution lead time is one period and where demand is forecasted with simple exponential smoothing. Two sets of convex piece-wise linear costs are considered. The first set is the traditional inventory holding and backlog costs. The second set of costs is piece-wise linear and increasing convex costs associated with the production order rate within and above a capacity constraint. Numerical investigations reveal that the classical Order-Up-To policy is no longer optimal when a broader range of costs is considered in the objective function.

  • 3.
    Feldmann, Andreas
    et al.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Olhager, Jan
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Fleet, Don
    Cambridge University.
    Shi, Yongjiang
    Cambridge University, UK.
    Linking networks and plant roles: The impact of changing a plant role2013In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 51, no 19, p. 5696-5710Article in journal (Refereed)
    Abstract [en]

    Many manufacturing firms are expanding their global footprint to explore new opportunities for efficient and effective production. The strategic perspective on international manufacturing networks involves both the network level and the plant level. A key aspect is the relationship between the network and the role of plants. In this research, we investigate the relationship between the network and plant perspectives in international manufacturing networks. We use an embedded case study that includes five plants in two product networks over a period of three years. We analyse how changing the role of one plant affects the network as well as the roles of the other plants in the networks. We find that decisions on plant roles are, to a very high degree, network decisions and not decisions for individual plants. Based on the insights into the case study, we also develop a framework for mapping manufacturing networks, including market coverage, plant location and site competence.

  • 4.
    Grubbström, Robert W
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, Faculty of Science & Engineering. Mediterranean Inst Adv Studies, Slovenia.
    Risk preference evaluation - a fourth dimension of the application of the Laplace transform2018In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 56, no 1-2, p. 344-373Article in journal (Refereed)
    Abstract [en]

    In this paper, we apply the Laplace transform to risk preference theory (decision theory, decision analysis). We show that with a constant measure of absolute risk aversion, the certainty monetary equivalent (CME) can be developed into an expression involving the logarithm of the bilateral Laplace transform of the probability density of the outcome of risky projects. We also introduce a measure named internal risk aversion (IRA). This is in analogy with the earlier application of the transform to net present value problems. Properties of the CME function are examined. Basic examples of application are introduced followed by applications to portfolio theory and option pricing.

  • 5.
    Grubbström, Robert W
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    The time-averaged L4L solution - a condition for long-run stability applying MRP theory2012In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 50, no 21, p. 6099-6110Article in journal (Refereed)
    Abstract [en]

    MRP theory provides a theoretical background for multi-level, multi-stage production-inventory systems (material requirements planning in a general sense) together with their economic evaluation, in particular applying the net present value principle. The theory combines the use of input-output analysis and Laplace transforms, the former for capturing product structures, and the latter for incorporating timing, including time lags, lead times, and output delays. In this paper, we consider any production policy, when given any external demand as a vector-valued function of time. It is shown that in order for available inventory to be kept at finite levels at any time, the lot-for-lot (L4L) solution must be valid for the time averages of production and deliveries, irrespective of the policy followed. This analysis is carried out using properties the Laurent expansions of the transforms involved.

  • 6.
    Grubbström, Robert W.
    et al.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Huynh, Thuy
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Analysis of standard ordering policies within the framework of MRP theory2006In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 44, no 18-19, p. 3759-3773Article in journal (Refereed)
    Abstract [en]

    A number of different standard ordering policies are presented within the methodology of Material Requirements Planning (MRP), such as Lot-For-Lot (L4L), Fixed Order Quantity (FOQ), Fixed Period Requirements (FPR), etc. In MRP theory the time development of the production-inventory system is determined by a set of fundamental equations for available inventory, total inventory and backlogs using Input-Output Analysis for capturing the Bill of Materials and Laplace transforms for describing the advanced timing requirements. This paper aims at formally introducing standard ordering policies into the fundamental equations of MRP Theory in order to analyse the possibility to obtain closed-form expressions for the time development of the system, when such rules are applied.

  • 7.
    Grubbström, Robert W.
    et al.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Tang, Ou
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Optimal production opportunities in a remanufacturing system2006In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 44, no 18-19, p. 3953-3966Article in journal (Refereed)
    Abstract [en]

    In recent years, remanufacturing has emerged in various industrial sectors, and it adds an additional production alternative apart from the conventional manufacturing process. With remanufacturing, a used return product is often disassembled, reprocessed, and then reassembled into a new product. The remanufactured product is often of the same quality as those from regular manufacturing. Even though remanufacturing saves a substantial cost of materials, it often requires more labour and other inputs. Thus, it becomes important to examine the expanded production opportunity of the system. In this paper, we therefore make a first attempt to model such a system with respect to its optimal production. This model is based on the Cobb-Douglas (Wicksell) production function. More specifically, we focus on how labour costs, material costs, and the budget influence optimal production decisions. Explicit properties of the optimal plan are derived and presented as theorems. Results of this study are intended to provide a guideline for managers to make sound decisions, when dealing with the increasingly important remanufacturing systems.

  • 8.
    Grubbström, Robert W.
    et al.
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Wang, Zhiping
    Linköping University, Department of Production Economics. Linköping University, The Institute of Technology.
    Introducing capacity limitations into multi-level, multi-stage production-inventory systems applying the input-output/Laplace transform approach2000In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 38, no 17, p. 4227-4234Article in journal (Refereed)
    Abstract [en]

    The Laplace transform and Input-Output Analysis have been used to formulate a theoretical basis for Material Requirements Planning (MRP). In this paper, as a first step to incorporating capacity limitations into this theory, we introduce alternative formulations of a model for capacity-constrained production-inventory systems in a deterministic environment applying the same approach. We focus our attention on the way in which the balance equations constraining the system need to be modified. A numerical example is given to explain the model.

  • 9.
    Li, Lin
    et al.
    Tongji University.
    Huo, Jiazhen
    Tongji University.
    Tang, Ou
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    A hybrid flowshop scheduling problem for a cold treating process in seamless steel tube production2011In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 49, no 15, p. 4679-4700Article in journal (Refereed)
    Abstract [en]

    Seamless steel tubes often have various categories and specifications, which further require complicated operations in production, especially in the cold treating process (CTP). This paper investigates the scheduling problem using the seamless tube plant of Baoshan Iron and Steel Complex as a study background. By considering the practical production constraints such as sequence-dependent setup times, maintenance schedule, intermediate material buffers, job-machine matches, we formulate the hybrid flowshop scheduling problem with a non-linear mixed integer programming model (NMIP). In addition, our model provides a flexibility to remove the permutation assumption, which is often a limitation in early studies. In order to obtain the solution of the above NMIP problem, a two-stage heuristic algorithm is proposed and it combines a modified genetic algorithm and a local search method. With real production instances, our computation experiments indicate that the proposed algorithm is efficient and it outperforms several other approaches. Industrial implementation also shows that such a scheduling tool brings a cost saving of more than 10% and it substantially reduces the computation time. Our study also illustrates the need of relaxing permutation assumption in such a scheduling problem with complicated operation sequences.

  • 10.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Sustainable competitive advantage in turbulent business environments2013In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 51, no 10, p. 2821-2841Article in journal (Refereed)
    Abstract [en]

    The future competitiveness of manufacturing operations under dynamic and complex business environments relies on forward-thinking strategies. The objective of this paper is to identify and develop the operational competitiveness in a sustainable manner by implementing a unique sustainable competitive advantage (SCA) for managing dynamic business situations. This paper develops a theoretical approach to integrating the core factors which affect operational competitiveness performance, that is to say manufacturing strategy and transformational leadership with technology level, into conceptual analytical models to evaluate overall competitiveness, and utilises sense and respond (S&R) for dynamic decision-making to optimise resource allocations and adjust strategies in order to develop competitiveness potential in a sustainable manner. From the empirical research, the adjustments in manufacturing strategy and transformation leadership by implementing SCA through fast strategy with proposed models are found to be effective and successful in managing turbulent business environments such as the economic crisis. Such proactive operations are proposed as the unique SCA with empirical research carried out in a global context, which provides both theoretical significance and also practical benefit to conclude the experience of managing operations in turbulent business environments.

  • 11.
    Liu, Yang
    et al.
    Department of Production, University of Vaasa, Vaasa, Finland.
    Liang, Liting
    SC-Research, University of Vaasa, Vaasa, Finland.
    Evaluating and developing resource-based operations strategy for competitive advantage: an exploratory study of Finnish high-tech manufacturing industries2015In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 53, no 4, p. 1019-1037Article in journal (Refereed)
    Abstract [en]

    Firms are struggling to achieve and maintain the competitive advantage in today’s turbulent business environment. How can we evaluate and (re)develop strategic initiatives that put into place operational capabilities to provide new sources of firm-level competitive advantage? This paper tries to explore the practical intersection of operations management and strategy from resource-based view by evaluating and developing the sustainability level of operational competitive advantage, that how well the resource-based strategy can support its operations. It develops a theoretical approach to integrate the core factors, which determine operational competitiveness performance – manufacturing strategy and its supporting resource allocation, into conceptual analytical models. The models utilise sense and respond (S&R) methodology for dynamic decision-making to detect and adjust resource allocation and in turn optimise the resource-based strategy in order to develop the operational competitive advantage in a sustainable manner. Eighteen case companies in Finnish high-tech manufacturing industries are selected for in-depth study and analysis with proposed models to conclude how the optimal adjustments of resource-based strategy by supporting its operations can lead to sustainable competitive advantage (SCA). Constantly optimising resource allocation aligning with resource-based operations strategy supported by the S&R idea of agile strategy implementations is proposed as the unique SCA.

  • 12.
    Matschewsky, Johannes
    et al.
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    Kambanou, Marianna Lena
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    Sakao, Tomohiko
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    Designing and providing integrated product-service systems: challenges, opportunities and solutions resulting from prescriptive approaches in two industrial companies2017In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588XArticle in journal (Refereed)
    Abstract [en]

    Due to customer pressure and growing competition, industrial companies are increasingly moving towards providing integrated offerings of products and services (PSS). Despite this trend, literature providing a deep understanding of the challenges associated with this transition is limited, while publications discussing approaches that focus on overcoming these challenges are particularly lacking. This article is based on a multi-case study of two Swedish industrial companies undergoing the transition to designing and providing PSS. It reports on the challenges identified at the case companies as well as opportunities arising from and solutions to these challenges. Subsequent to initial research on the challenges, prescriptive approaches such as a life cycle costing method and a PSS design method were applied in the case companies over an extended time frame. On the one hand, these prescriptive approaches provided both a deeper understanding of the challenges, which include a persistent product centred mindset, a lack of adjustment to changed incentive structures and the separation of product and service design. On the other hand, they also led to effective solutions such as focusing on customer value and introducing a PSS transition facilitator for the design team. These solutions were adapted to the situations in the respective companies and they partly went beyond the prescriptive measures first introduced. Therefore, the article shows the applicability of prescriptive approaches and methods to detect, understand and alleviate the challenges of PSS design and provision. Further, the article provides broadly applicable learning for industrial companies undergoing this process.

  • 13.
    Olhager, Jan
    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.
    Linking manufacturing strategy decisions on process choice with manufacturing planning and control systems2002In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 40, no 10, p. 2335-2351Article in journal (Refereed)
  • 14.
    Olhager, Jan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Selldin, Erik
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Manufacturing planning and control approaches: market alignment and performance2007In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 45, no 6, p. 1469-1484Article in journal (Refereed)
    Abstract [en]

    The design of manufacturing planning and control (MPC) systems is a strategic decision for manufacturing operations. In this paper we analyze the interrelationships between the choice of MPC approaches at different hierarchical levels with market requirements and operational performance. These relationships are explored through an extensive survey comprising responses from 128 manufacturing firms. The results show that the choice of MPC approaches, primarily at the sales and operations planning and master scheduling levels, has a significant mediating role in improving performance. The alignment between market requirements and the choice of MPC approaches is significant and has a significant impact on performance. In a dynamic environment, the choice of MPC approaches is shown to have a positive mediating effect on operational performance.

  • 15.
    Persson, Jan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Optimization .
    Göthe-Lundgren, Maud
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Optimization .
    Lundgren, Jan
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gendron, Bernard
    A tabu search heuristic for scheduling the production processes at an oil refinery2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 3, p. 445-471Article in journal (Refereed)
    Abstract [en]

    In this paper we present a tabu search heuristic which can be used for scheduling the production at an oil refinery. The scheduling problem is to decide which production modes to use at the different processing units at each point in time. The problem is a type of lot-sizing problem where costs of changeovers, inventories and production are considered. In the suggested tabu search heuristic we explore the use of variable neighbourhood, dynamic penalty and different tabu lists. Computational results are presented for different versions of the heuristic and the results are compared to the best-known lower bound for a set of scheduling scenarios.

  • 16.
    Sakao, Tomohiko
    Darmstadt University of Technology.
    A QFD-centred design methodology for environmentally conscious product design2007In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 45, no 18-19, p. 4143-4162Article in journal (Refereed)
    Abstract [en]

    As our society becomes more environmentally conscious, manufacturers must incorporate 'environmental qualities' into products. This paper proposes a general design methodology to effectively support environmentally consciousness design of products. The methodology employs three tools: LCA (life cycle assessment), QFDE (quality function deployment for environment), and TRIZ (theory of inventive problem solving). QFDE is a tool developed by modifying and extending QFD, and is extended further in this paper. In addition, connecting two consecutive tools is realized by established relations among those tools. The presented methodology is proved through application to a hair dryer to effectively support the product planning and conceptual design stages. For instance, designers could utilize one of the LCA results that the product has a high impact on global warming through energy consumption during its use phase to define a requirement objectively in QFDE, 'reduce the energy consumption' with a high weighting. TRIZ allowed designers to generate four improvement solutions. The most highly evaluated was using resonance frequency on the motor. This was obtained from a QFDE result that 'dry quickly' and 'dry quietly' have a contradiction. The methodology has a larger benefit than is obtained from utilizing those three tools independently.

  • 17.
    Shuoguo, Wei
    et al.
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
    Tang, Ou
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Real option approach to evaluate cores for remanufacturing in service markets2015In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 53, no 8, p. 2306-2320Article in journal (Refereed)
    Abstract [en]

    Acquisition of cores is important for the success of remanufacturing business, but evaluating the value of cores is difficult due to many uncertain issues in the remanufacturing system. In this paper, we examine the value of cores using the real option valuation (ROV) approach, which well captures the production flexibility and represents different operations options in remanufacturing. First, in a system where the demand of remanufactured products is low, we focus on the uncertainty of price. We compare the cases where disposing cores occurs only at the expiration time and before that. The model also identifies under which circumstances disposing core early brings in more benefit. Furthermore, we study a remanufacturing system where demand and return are both uncertain. In this case, a spread option is used for evaluating the marginal value of obtaining additional cores. This approach also brings the advantage of linking the correlation between demand and return, which in fact is often exhibited in remanufacturing. The numerical experiments indicate that this correlation has an impact on collecting policies. This study illustrates the possibility of using ROV for core pricing modelling, and the study results also provide some managerial insights in managing returned cores.

  • 18.
    Spiegler, Virginia L M
    et al.
    Cardiff University, Wales .
    Naim, Mohamed M
    Cardiff University, Wales .
    Wikner, Joakim
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    A control engineering approach to the assessment of supply chain resilience2012In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 50, no 21, p. 6162-6187Article in journal (Refereed)
    Abstract [en]

    There is no consensus on the supply chain management definition of resilience. To aid in evaluating the dynamic behaviour of such systems we need to establish clearly elucidated performance criteria that encapsulate the attributes of resilience. A literature review establishes the latter as readiness, responsiveness and recovery. We also identify robustness as a necessary condition that would complement resilience. We find that the Integral of the Time Absolute Error (ITAE) is an appropriate control engineering measure of resilience when it is applied to inventory levels and shipment rates. We use the ITAE to evaluate an often used benchmark model of make-to-stock supply chains consisting of three decision parameters. We use both linear and nonlinear forms of the model in our evaluation. Our findings suggest that optimum solutions for resilience do not yield a system that is robust to uncertainties in lead-time. Hence supply chains will experience drastic changes in their resilience performance when lead-time changes.

  • 19.
    Tang, Ou
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Production Economics .
    Modelling stochastic lead times in a production-inventory system based on the Laplace transform method2000In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 38, no 17, p. 4217-4226Article in journal (Refereed)
    Abstract [en]

    Stochastic properties of a multi-period production-inventory system have been studied in several papers by applying the Laplace transform. However, the source of uncertainty has been limited to external demand and the production/replenishment lead time has been assumed to be constant. In this paper, we investigate the situation when the lead time is a random variable. Transform methods are again used to capture the stochastic properties of the system, such as stockout functions. With the objective of maximizing the net present value of the cash flow, we derive conditions for optimal production decisions in this system. The properties of cash outflow due to stockouts will also be discussed.

  • 20.
    Tang, Ou
    et al.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Grubbström, Robert W.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    Zanoni, Simone
    Università degli Studi di Brescia, Italy.
    Economic evaluation of disassembly processes in remanufacturing systems2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 17, p. 3603-3617Article in journal (Refereed)
    Abstract [en]

    A model to deal with the disassembly processes in remanufacturing systems is presented with focus being on evaluating their economic consequences. More specifically, the model assists decisions such as to which degree and for the sake of which components should the returned items be disassembled. Consequently, using the economic values of recoverable items, the inventory holding costs of these items are obtained. This information is further used to determine the inventory control policy. To access such economic values, the above average cost approach is compared with the net present value method. The latter is often considered a more 'correct' way in remanufacturing systems from the viewpoint of inventory control. The results from the economic evaluation model are intended to aid companies in systematically evaluating current as well as projected remanufacturing systems.

  • 21.
    Tang, Ou
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Production Economics .
    Naim, MM
    Logistics Systems Dynamics Group, Cardiff Business School, Cardiff University, Colum Drive, Cardiff, CF10 3EU, United Kingdom.
    The impact of information transparency on the dynamic behaviour of a hybrid manufacturing/remanufacturing system2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 19, p. 4135-4152Article in journal (Refereed)
    Abstract [en]

    A combined manufacturing/remanufacturing system is modelled and its dynamic behaviour is investigated using a control engineering approach. The model is an extension of the automated pipeline, inventory and order based production control system (APIOBPCS), which is well understood from a dynamic perspective. It is assumed that the remanufacturing process is based on a PUSH policy. Utilising different levels of information transparency from the remanufacturing process, three system types are developed and compared. Mathematical and simulation analyses of the system types were undertaken and their robustness to remanufacturing process uncertainties were tested. Our analysis indicates that the greater the degree of information transparency, the greater the robustness of the hybrid system.

  • 22.
    West, Martin
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering.
    Bengtsson, Jens
    Dept of Finance and Management Science Norwegian School of Economics and Business Administration.
    Designing production processes in global manufacturing using a real options approach2007In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 45, no 8, p. 1745-1762Article in journal (Refereed)
    Abstract [en]

    A main source of competitive advantage is derived from the cost efficiency offered by firms' manufacturing and logistics operations. Consequently, firms typically globalise their operations whereby they may exploit the comparative advantages - defined as production functions - of the nations in which they are present. Production process design thus arises as a significant issue. The research presented in this paper targets two fundamental questions attached to production process design that multinational companies face, namely: (i) should plants that are located in different countries but producing similar products use similar production processes?, and (ii) given that the firm's policy is to use similar production processes, how should the production processes be designed? Among others, the paper shows, by way of a numerical illustration of a binational manufacturing network, that the option of choosing freely upon production process design for the respective facilities in certain cases adds little to firm value. In fact, the value of this option tends to zero as the volatility rate increases when the exchange rate is modelled as a geometric Brownian motion without drift rate, implying that firms should employ similar production processes throughout their manufacturing networks. That is, a market value approach stands up for the so-called copy-exactly approach to production process design in these settings. We furthermore show the effects of economies of scale on the optimal production process design.

  • 23.
    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.

  • 24. Zanoni, S.
    et al.
    Ferretti, I.
    Tang, Ou
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Production Economics .
    Cost performance and bullwhip effect in a hybrid manufacturing and remanufacturing system with different control policies2006In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 44, no 18-19, p. 3847-3862Article in journal (Refereed)
    Abstract [en]

    In recent years, remanufacturing has emerged as an important research area. This requires developing methods and models in order to aid companies in systematically evaluating current as well as projected remanufacturing systems. This paper addresses the inventory control problem in a hybrid inventory system with manufacturing and remanufacturing options. In this study, by changing the definition of inventory position of the serviceable stock, we introduce a shift PULL inventory control policy, which is compared with PULL, DUAL, and Separate PULL control policies studied previously in the literature. Besides evaluating the economic consequences with different control policies, we also study system dynamic behaviour such as the bullwhip effect, in order to understand the advantages and disadvantages of different policies. After the experiments, we propose several management guidelines for such a hybrid inventory system. The major findings are: (1) separate PULL and DUAL can be good alternatives when the manufacturing lead time is significantly longer than the remanufacturing lead time, (2) shifted PULL exhibits a good performance when the two lead times differ slightly. Owing to the complexity in solving the optimization problem, a simulation approach is used.

  • 25.
    Zanoni, S.
    et al.
    Universita degli Studi di Brescia, Facoltà di Ingegneria, Departmento di Ingegneria Meccanica, Via Branze 38, I-25123 Brescia, Italy.
    Grubbstrom, R.W.
    Department of Production Economics, Linkoping Institute of Technology, SE-581 83 Linkoping, Sweden.
    A note on an industrial strategy for stock management in supply chains: Modelling and performance evaluation2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 20, p. 4421-4426Article in journal (Refereed)
    Abstract [en]

    An analytic formulation of consignment stock (CS) policy has been proposed in Braglia and Zavanella (2003, International Journal of Production Research, 41, 3793) where an implicit analytical solution is given. In this note it is shown that this solution has properties that enable it to be developed into a completely explicit form, allowing for a joint optimization of all decision variables governing the delivery management.

  • 26.
    Zanoni, Simone
    et al.
    Università degli Studi di Brescia, Italy.
    Grubbström, Robert W.
    Linköping University, Department of Management and Engineering, Production Economics. Linköping University, The Institute of Technology.
    A note on an industrial strategy for stock management in supply chains: modelling and performance evaluation2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 20, p. 4421-4426Article in journal (Refereed)
    Abstract [en]

    An analytic formulation of consignment stock (CS) policy has been proposed in Braglia and Zavanella (2003, International Journal of Production Research 41, 3793) where an implicit analytical solution is given. In this note it is shown that this solution has properties that enable it to be developed intoa completely explicit form, allowing for a joint optimization of all decision variables governing the delivery management.

  • 27.
    Zhang, Yingfeng
    et al.
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, School of Mechanical Engineering, Northwestern Polytechnical University, Shaanxi, China.
    Liu, Sichao
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, School of Mechanical Engineering, Northwestern Polytechnical University, Shaanxi, China.
    Liu, Yang
    Department of Production, University of Vaasa, Vaasa, Finland.
    Li, Rui
    Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, School of Mechanical Engineering, Northwestern Polytechnical University, Shaanxi, China.
    Smart box-enabled product–service system for cloud logistics2016In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 54, no 22, p. 6693-6706Article in journal (Refereed)
    Abstract [en]

    Modern logistics takes significant progress and rapid developments with the prosperity of E-commerce, particularly in China. Typical challenges that logistics industry is facing now are composed by a lack of sharing, standard, cost-effective and environmental package and efficient optimisation method for logistics tasks distribution. As a result, it is difficult to implement green, sustainable logistics services. Three important technologies, Physical Internet (PI), product–service system (PSS) and cloud computing (CC), are adopted and developed to address the above issues. PI is extended to design a world-standard green recyclable smart box that is used to encapsulate goods. Smart box-enabled PSS is constructed to provide an innovative sustainable green logistics service, and high-quality packaging, as well as reduce logistics cost and environmental pollution. A real-time information-driven logistics tasks optimisation method is constructed by designing a cloud logistics platform based on CC. On this platform, a hierarchical tree-structure network for customer orders (COs) is built up to achieve the order-box matching of function. Then, a distance clustering analysis algorithm is presented to group and form the optimal clustering results for all COs, and a real-time information-driven optimisation method for logistics orders is proposed to minimise the unused volume of containers. Finally, a case study is simulated to demonstrate the efficiency and feasibility of proposed cloud logistics optimisation method. © 2016 Informa UK Limited, trading as Taylor & Francis Group.

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