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  • 1.
    Axsäter, Sven
    Luleå tekniska universitet.
    Evaluation of lot-sizing techniques1986In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 24, no 1, p. 51-57Article in journal (Refereed)
    Abstract [en]

    Standard lot-sizing models are often not directly applicable in practice. Different assumptions in lot-sizing models and the extent to which these assumptions are valid in various practical situations are discussed. Practitioners also tend to prefer simple standard methods even for complex problems, which means that adjustment of the lot sizes may be desirable. The ways in which such adjustments can be carried out are analyzed.

  • 2.
    Axsäter, Sven
    et al.
    Luleå tekniska universitet.
    Nuttle, Henry L.W.
    Department of Industrial Engineering, North Carolina State University.
    Combining items for lot sizing in multi-level assembly systems1987In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 25, no 6, p. 795-807Article in journal (Refereed)
    Abstract [en]

    Many manufacturing firms are faced with the problem of planning the production/purchase quantities for items in single product, multi-level assembly production/inventory systems. Such systems are characterized by a single product, or end item, used to satisfy customer demand, which is assembled from a number of component items which, in turn, may be assembled from one or more other component items, etc. Component items may be either fabricated or purchased. This paper identifies conditions on the cost parameters which, when applicable, allow items to be combined for purpose of optimization, thereby reducing the size of the problem.

  • 3.
    Brander, Pär
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Forsberg, Rolf
    Cyclic lot scheduling with sequence-dependent set-ups: a heuristic for disassembly processes2005In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 43, no 2, p. 295-310Article in journal (Refereed)
    Abstract [en]

    The importance of material and product recovery is steadily increasing, mainly due to customer expectations and take-back obligations. Disassembly is a major operation in material and product recovery, since returned products are often disassembled to separate materials and components. The paper considers the problem of scheduling several items on a single disassembly facility. It develops a cyclic lot-scheduling heuristic for disassembly processes with sequence- dependent set-ups, resulting in disassembly frequencies for the items. Additionally, the way the problem is formulated allows calculation of the profitable use of the facility. The disassembly frequencies and the profitable use of the facility are used to create a cyclic schedule.

  • 4. Brander, Pär
    et al.
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Economic lot scheduling problems incorporating a cost of using the production facility2009In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 47, no 13, p. 3611-3624Article in journal (Refereed)
    Abstract [en]

    This paper considers scheduling the production of several different items on a single machine with constrained capacity, commonly known as the Economic Lot Scheduling Problem (ELSP). Most traditional approaches for the ELSP consider the sum of the setup cost and inventory holding cost and provide cyclic schedules that minimize this sum. In practice, there are not only costs for setups and inventory holding, but also costs for operating the production facility due to e.g. electricity, service, maintenance, tools, operators etc, which depend on the number of hours the facility is operating per working day. In this paper, we modify the traditional cost function to include not only setup and inventory holding cost but also a time variable cost for operating the production facility. The paper shows it is possible to adapt a previous heuristic procedure to this complemented cost. The model can help to determine cyclic schedules and the number of production hours per working day.

  • 5.
    Buffington, John
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Amini, Mehdi
    Department of Marketing and Supply Chain Management, Fogelman College of Business and Economics, University of Memphis.
    Keskinturk, Timur
    Department of Business Administration, Istanbul University.
    Development of a product design and supply-chain fulfillment system for discontinuous innovation2012In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 50, no 14, p. 3776-3785Article in journal (Refereed)
    Abstract [en]

    Given the lengthy product development lifecycle process, high cost, and low success rate, many firms avoid considering discontinuous innovation strategies, in spite of their increase in frequency and importance in many markets. Even with advances in automation and technology, many of the techniques being utilised in product development are relatively unchanged, and the definition of discontinuous innovation itself lacks a structural component. To address this problem, the authors developed a methodology for generative customisation to implement discontinuous innovation. Using the emerging technologies of generative design and agent-based modelling, the authors developed a methodology to create product inventions and measure product innovations using a complex adaptive system (CAS) model. This appears to be the first model that represents a complex adaptive system environment to measure the success of discontinuous innovation in the development of a market equilibrium agent model.

  • 6.
    Holmbom, Martin
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Sluis, Erik van der
    Amsterdam University of Applied Science, School of Technology.
    A solution procedure for Economic Lot Scheduling Problems even in high utilisation facilities2013In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 51, no 12, p. 3765-3777Article in journal (Refereed)
    Abstract [en]

    Economic lot scheduling problem (ELSP) handles the problem of deciding what order quantities to use when different products/items are produced in the same capacity constrained production facility. It has previously been shown, and it is shown in this article, that it is possible to find a feasible solution fulfilling true feasibility conditions. However, if the utilisation of the production facility is high the production often has to start before the inventory reaches zero to avoid future shortages. Such ‘early starts’ creates an extra inventory holding cost that the traditional approximation for the inventory holding cost does not account for. This article presents an iterative solution procedure that computes the true inventory holding cost and minimises the total costs. Contrary to previous solution procedures, this procedure requires that the production is scheduled in detail. The heuristic solution procedure is illustrated by a numerical example, it is programmed in MATLAB and variants of the problem are presented.

  • 7.
    Karlsson, Anna
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Larsson, Lisa
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Öhrwall Rönnbäck, Anna
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Innovation and Design.
    Product-Service System Innovation Capabilities: Linkages between the Fuzzy Front End and subsequent development phases2018In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 56, no 6, p. 2218-2232Article in journal (Refereed)
    Abstract [en]

    In an attempt to remain competitive, manufacturers increasingly offer integrated product-service systems (PSSs). This transition from physical products to PSSs calls for new ways of working, for example in the product development process. However, so far only limited attention has been put on capabilities needed to succeed with PSS innovation in the very early development phases – often referred to as the fuzzy front end (FFE). This article, therefore, has a dual aim: first, to further our understanding of capabilities for PSS innovation in the FFE, and second, to determine how these capabilities are linked to PSS innovation capabilities needed in subsequent development phases. Empirical data were collected from an ongoing industrial project developing an innovative PSS offering in a large manufacturing company. Individuals connected to the project reported major challenges, both experienced in the FFE and anticipated in later phases, which provided valuable information regarding capabilities needed to succeed with the endeavour. Findings reveal four links of PSS innovation capabilities: (1) adapting vocabulary and mental models to PSS, (2) handling the ‘intangible aspect’, (3) bridging organisational structures, and (4) managing new business models. PSS innovation capabilities in the FFE are also found to be of higher order (dynamic) compared to capabilities in later development phases

  • 8.
    Kulahci, Murat
    et al.
    Department of Industrial Engineering, Arizona State University, Tempe.
    Montgomery, Douglas C.
    Division of Mathematical and Natural Sciences, Arizona State University, Department of Industrial Engineering, Arizona State University, Tempe.
    Feng, JAck
    Department of Industrial and Manufacturing Engineering and Technology, Bradley University, Peoria, IL.
    Editorial2007In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 45, no 23, p. 5453-5454Article in journal (Other academic)
  • 9.
    Legge, David
    Luleå tekniska universitet.
    Integration of design and inspection systems: a literature review1996In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 34, no 5, p. 1221-1241Article in journal (Refereed)
    Abstract [en]

    This article reviews the published material relating to the integration of computer aided design with automatic or semi-automatic off-line programming (OLP) systems for coordinate measuring machines. Numerous techniques have been developed and demonstrated in research systems for the creation and validation of inspection plans and are now becoming available in commercial systems. Fully automated inspection planning is not yet generally available, primarily due to the problems of tolerancing 3D CAD models and transferring this information to OLP systems

  • 10.
    Liu, Biyu
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Holmbom, Martin
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Chen, Weida
    School of Economics and Management, Southeast University, Nanjing.
    Effects of carbon emission regulations on remanufacturing decisions with limited information of demand distribution2015In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 53, no 2, p. 532-548Article in journal (Refereed)
    Abstract [en]

    Policy-makers are developing regulation policies to drive down carbon emissions from industries. Independent remanufacturers (IRs), which remanufacture recycled products/components/parts, must manage and evaluate economic costs generated by the production under future carbon emission regulations. We present three optimisation models to determine the remanufacturing quantity that maximises the total profits under three common carbon emission regulation policies: (a) mandatory carbon emissions capacity, (b) carbon tax and (c) cap and trade. These models include sales revenue, remanufacturing cost, disposal cost, inventory holding cost, shortage cost and carbon emission cost. The max–min approach is used to solve the models, which assume limited information on demand distribution. We investigate how the three regulation policies affect remanufacturing decision-making for IRs and we also solve some numerical examples where we vary the magnitudes of incentives, penalties and stringency of constraints to provide implications to policy-makers. The results indicate that remanufacturers should aim to improve yield rate to maximise the profit irrespective of the implemented carbon emissions policy. Policy-makers should prefer the carbon tax policy, if any of the other two policies must be performed, a remanufacturing discount such as a higher carbon emission cap or lower penalty should be implemented to better promote the development of remanufacturers.

  • 11.
    Marti Bigorra, Anna
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Isaksson, Ove
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Combining customer needs and the customer’s way of using the product to set customer-focused targets in the House of Quality2017In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 55, no 8, p. 2320-2335Article in journal (Refereed)
    Abstract [en]

    An increasing number of products are equipped with software and sensors. This suggests that, in order to deliver more customised performance, future products will be developed to accommodate systems that supply information on how these products are used. Today, information on the customer’s way of using a product is seldom factored into product design, but the opportunities for making use of it are increasing dramatically due to the amount of available data that can be logged. The proposed methodology is to formulate Customer Needs at a detailed level to be able to link customer satisfaction with a clear interface to the Design Requirements. These links are obtained by combining information acquired by means of surveys, among other methodologies, as well as usage data from customer products. The method is based on the planning House of Quality and also takes cost and risk into consideration. Risk is estimated using the Analytical Hierarchy Process, whereby a hierarchy of the most relevant customer information is constructed to make designers aware of how customer-focused the design process is. To validate the proposed methodology an illustrative example is presented. Results show that the method provides valuable information that enables the company to remain customer-focused during the whole process but also when strategic decisions on price and product launch are made.

  • 12.
    Pettersen, Jan-Arne
    et al.
    IBDK, Narvik University College.
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Bang, Børre
    IBDK, Narvik University College.
    Three-dimensional performance surfaces: a tool for analysing and estimation of production system performances2010In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 48, no 17, p. 4937-4948Article in journal (Refereed)
    Abstract [en]

    This paper presents a new method to describe, analyse and estimate production system performances. Work-in-process (units), lead time (number of time units spent in the production system for each unit) and throughput (number of produced units per time unit) are basic performance measures, also used in this article. It is essential for industry to know about relations between system parameters and system performances in existing systems, and in not yet implemented system alternatives. Different performances are achieved by adjusting system parameters. Trade-offs between system parameters and its different performances are necessary to stay efficient and competitive in today's market. Queuing theory and simulation can help the decision makers to estimate system performances of existing and not yet implemented systems. When the complexity increases queuing theory becomes cumbersome, very difficult and eventually impossible to use. A single simulation presents limited information. Multiple simulations are necessary to ensure that the best alternative is chosen. A high number of simulations demand a lot of computer time and resources. Reduction of runs is desirable even with cheaper computer equipment. Currently, traditional two-dimensional charts are the only tools to present and analyse system performances. This article presents a new surrogate model for easier estimation and presentation of system performances, their internal relations, and relations to the system parameters. With the new surrogate model, system performances based on simulations are presented as positions in a three-dimensional environment. Parametric curves and surfaces of Bezier type are generated and adapted to these positions. System performances of other system alternatives can then be estimated without explicit simulation. The number of simulation calculations can thereby be moderated. The method is illustrated with a small production line system

  • 13.
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Frequency approach for treating capacity-constrained multilevel production2004In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 42, no 16, p. 3119-3137Article in journal (Refereed)
    Abstract [en]

    An idea about how to tackle and solve the difficult problem of determining economic order quantities in capacity-constrained multilevel production is presented. The idea is based on frequencies during a variable time interval as variables instead of explicit order quantities. The presented heuristic model handles assumed constant demand for several items and calculates fixed-order quantities assumed to be possible to repeat in a cyclic pattern. In the model, every item is supposed to be manufactured at least once per year, or during another maximum period, to stop order quantities that are too large and therefore hinder inventories that are exceedingly large and/or obsolete. During a time interval, it was decided how many times each item should be produced. The paper starts with a common frequency for all items, i.e. the highest frequency possible for all items during this maximum time interval considering the capacity restrictions of the different machines. Thereafter, the frequency for items with high set-up costs compared with the inventory holding costs is reduced if it decreases the total cost of set-ups and inventory holding. Only frequencies in multiples of two are used to make a cycle policy easier to establish, to prevent remnant stocks and to make the used cost approximation fit more accurately.

  • 14.
    Segerstedt, Anders
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Master production scheduling and a comparison of material requirements planning and cover-time planning2006In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 44, no 18, p. 3585-3606Article in journal (Refereed)
    Abstract [en]

    For a company's long-term profitability, the most important processes are the way it starts parts of the manufacturing process before the customer order arrives and the way it determines and promises delivery quantities and times for customer orders. In practical computer applications Material Requirement Planning (MRP) and/or Reorder point systems are the base techniques mostly used. This paper presents Cover-Time Planning (CTP), a variant of a reorder point system, which is developed with a forward-looking forecasted demand rate and the decision variable is ‘time’, instead of ‘quantity’ for an ordinary reorder-point system. MRP and CTP are introduced and compared through a numerical example. MRP and CTP must treat a practical ‘make-to-order’; therefore, this paper discusses available-to-promise, planning bills and other help systems for practical applications of Master Production Scheduling. The paper presents how and why, in practice, a Master Production Scheduling system with an available-to-promise function should be used and how this system should be designed. It is also argued that a fully Enterprise Resource Planning (ERP) system cannot only be created by MRP, but also by CTP.

  • 15.
    Svoboda, Ales
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Tatar, Kourosh
    Norman, Peter
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Bäckström, Mikael
    Luleå tekniska universitet.
    Integrated approach for prediction of stability limits for machining with large volumes of material removal2008In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 46, no 12, p. 3207-3222Article in journal (Refereed)
    Abstract [en]

    High-speed machining of thin-walled structures is widely used in the aeronautical industry. Higher spindle speed and machining feed rate, combined with a greater depth of cut, increases the removal rate and with it, productivity. The combination of higher spindle speed and depth of cut makes instabilities (chatter) a far more significant concern. Chatter causes reduced surface quality and accelerated tool wear. Since chatter is so prevalent, traditional cutting parameters and processes are frequently rendered ineffective and inaccurate. For the machine tool to reach its full utility, the chatter vibrations must be identified and avoided. In order to avoid chatter and implement optimum cutting parameters, the machine tool including all components and the work piece must be dynamically mapped to identify vibration characteristics. The aim of the presented work is to develop a model for the prediction of stability limits as a function of process parameters. The model consists of experimentally measured vibration properties of the spindle-tool, and finite element calculations of the work piece in (three) different stages of the process. Commercial software packages used for integration into the model prove to accomplish demands for functionality and performance. A reference geometry that is typical for an aircraft detail is used for evaluation of the prediction methodology. In order to validate the model, the stability limits predicted by the use of numerical simulation are compared with the results based on the experimental work.

  • 16.
    Vagenas, Nikos
    Luleå tekniska universitet.
    Dispatch control of a fleet of remote-controlled/automatic load-haul-dump vehicles in underground mines1991In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 29, no 11, p. 2347-2363Article in journal (Refereed)
    Abstract [en]

    Recently, a concept for automating load-haul-dump (LHD) vehicles has stimulated considerable interest in the world mining industry. In this concept, the tramming and dumping operations of an LHD should be automatic. During loading, an operator from a control room fills the bucket of a vehicle via remote-control aided by a television system. The application of such a remote-control/automatic LHD (RAL) system in underground mines exhibits some operational and traffic control characteristics that have not been studied previously in mining (e.g. vehicle motion in bidirectional lane-segments, lack of alternative routes to the same destination, stochastic nature of an RAL system due to human involvement in the loading operation). This paper presents and discusses a dispatch and traffic control procedure for a fleet of RAL vehicles operating in an underground mining transport layout. The development of this procedure has been based on concepts in graph theory

  • 17. Wiklund, Håkan
    A statistical approach to real-time quality control1999In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 37, no 18, p. 4141-4155Article in journal (Refereed)
    Abstract [en]

    Modern manufacturing processes characterized by short series, complex part geometry and high refinement values often demonstrate conditions when traditional quality control (QC) methods do not work properly. This paper presents a prototype system for real-time QC where the developed methods and applications are integrated and post-process quality control is applied only as a complement and for reference measurements. All activities are supervised and fed with information from a developed active data acquisition system. The proposed concept contributes to bridging the gap between traditional post-process control and real-time QC of machining processes

1 - 17 of 17
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