| 1. |
- Bergquist, Bjarne, et al.
(författare)
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A Bayesian analysis of unreplicated two-level factorials using effects sparsity, hierarchy, and heredity
- 2011
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Ingår i: Quality Engineering. - : Informa UK Limited. - 0898-2112 .- 1532-4222. ; 23:2, s. 152-166
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Tidskriftsartikel (refereegranskat)abstract
- This article proposes a Bayesian procedure to calculate posterior probabilities of active effects for unreplicated two-level factorials. The results from a literature survey are used to specify individual prior probabilities for the activity of effects and the posterior probabilities are then calculated in a three-step procedure where the principles of effects sparsity, hierarchy, and heredity are successively considered. We illustrate our approach by reanalyzing experiments found in the literature.
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| 2. |
- Bergquist, Bjarne, et al.
(författare)
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Alive and kicking–but will Quality Management be around tomorrow? : A Swedish academia perspective
- 2012
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Konferensbidrag (refereegranskat)abstract
- Purpose: There is a lack of a recognized conception of quality management (QM) comprises of, as well as a clear roadmap of where QM is heading. The purpose of this article is to investigate how QM is perceived today by scholars at three Swedish universities, but also how and into what QM is expected to develop into in twenty years.Methodology: Data have been collected through three structured workshops using affinity diagrams with scholars teaching and performing research in the QM field affiliated with three different Swedish universities.Findings: The results indicate that current QM is perceived similarly among the universities today, although the taxonomy differs slightly. QM is described as a fairly wide discipline consisting of a set of core of principles that in turn guide which methods and tools that currently by many are perceived as the core of the discipline. The outlook for the future differs more where three possible development directions for QM are seen: [1] searching for a “discipline X” where QM can contribute while keeping its toolbox, [2] focus on a core based on the traditional quality technology toolbox with methods and tools, and [3] a risk that QM, as it is today, may seize to exist and be diffused into other disciplines. Originality/value: This article contributes with a viewpoint on QM today and its future development from the academicians’ perspective.
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| 3. |
- Bergquist, Bjarne, et al.
(författare)
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Alive and kicking–but will Quality Management be around tomorrow? A Swedish academia perspective
- 2012
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Ingår i: Quality Innovation Prosperity. - : Technical University of Kosice, Faculty of Materials, Metallurgy and Recycling. - 1335-1745 .- 1338-984X. ; 16:2, s. 1-18
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this article is to describe how Quality Management (QM) is perceived today by scholars at three Swedish universities, and into what QM is expected to develop into in twenty years. Data were collected through structured workshops using affinity diagrams with scholars teaching and performing research in the QM field. The results show that QM currently is perceived as consisting of a set of core of principles, methods and tools. The future outlook includes three possible development directions for QM are seen: [1] searching for a “discipline X” where QM can contribute while keeping its toolbox, [2] focus on a core based on the traditional quality technology toolbox with methods and tools, and [3] a risk that QM, as it is today, may seize to exist and be diffused into other disciplines.
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| 4. |
- Bergquist, Bjarne, et al.
(författare)
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Power Analysis of Methods for Analysing Unreplicated Factorial Experiments
- 2013
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Konferensbidrag (refereegranskat)abstract
- Several methods for formal analysis of unreplicated factorial type experiments have been proposed in the literature. Based on a simulation study, five formal methods found in the literature based on the effect sparsity principle have been studied. The simulation included 23 and 24 type factorials with one, two, or four active effects. The simulated signal-to-noise ratios for the effects were all between two and four, and the Type I and Type II errors of the analysis methods were analysed. Preliminary results show that Bayesian models are more powerful in these contexts, especially if informative priors based on the effect heredity and effect hierarchy principles are used.
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| 5. |
- Holmbom, Martin, et al.
(författare)
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Performance-based logistics – an illusive panacea or a concept for the future?
- 2014
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Ingår i: Journal of Manufacturing Technology Management. - 1741-038X .- 1758-7786. ; 25:7, s. 958-979
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Tidskriftsartikel (refereegranskat)abstract
- Purpose– The purpose of this paper is to summarize previously reported benefits, drawbacks and important aspects for implementation of performance-based logistics (PBL), and to identify knowledge gaps.Design/methodology/approach– This is a literature review based on 101 articles. The reviewed articles are relevant to PBL in particular, but also to performance contracting, product-service systems (PSS) and servitization in general. The research method involved database searches, filtering results and reviewing publications.Findings– PBL is a business concept that aims to reduce the customer's total costs for capital-intensive products and increase the supplier's profit. The design of the contract, performance measurements and payment models are important aspects for successful implementation. However, the authors find a reason for concern to be the lack of empirical evidence of the profitability of PBL for the customer and the supplier.Originality/value– This literature review of PBL also includes publications from the related research areas: performance contracting, PSS and servitization. Developing PBL can benefit from results in these research areas.
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| 6. |
- Kvarnström, Björn, et al.
(författare)
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Using RFID to improve traceability in process industry : experiments in a distribution chain for iron ore pellets
- 2010
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Ingår i: Journal of Manufacturing Technology Management. - : Emerald. - 1741-038X .- 1758-7786. ; 21:1, s. 139-154
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The purpose of the article is to explore the application of Radio Frequency Identification (RFID) to improve traceability in a flow of granular products and to illustrate examples of special issues that need to be considered when using the RFID technique in a process industry setting.Design/methodology/approach: The article outlines a case study at a Swedish mining company including experiments to test the suitability of RFID to trace iron ore pellets (a granular product) in parts of the distribution chain.Findings: The results show that the RFID technique can be used to improve traceability in granular product flows. A number of special issues concerning the use of RFID in process industries are also highlighted, for example, the problems to control the orientation of the transponder in the read area and the risk of product contamination in the supply chain.Research limitations/implications: Even though only a single case has been studied, the results are of a general interest for industries that have granular product flows. However, future research in other industries should be performed to validate the results.Practical implications: The application of RFID described in this article makes it possible to increase productivity and product quality by improving traceability in product flows where traceability normally is problematic. Originality/value: Prior research has mainly focused on RFID applications in discontinuous processes. By contrast, this article presents a novel application of the RFID technique in a continuous process together with specific issues connected to the use of RFID.
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| 7. |
- Lundkvist, Peder, et al.
(författare)
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Identifying Process Dynamics through a Two-Level Factorial Experiment
- 2014
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Ingår i: Quality Engineering. - : Informa UK Limited. - 0898-2112 .- 1532-4222. ; 26:2, s. 154-167
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Tidskriftsartikel (refereegranskat)abstract
- Industrial experiments are often subjected to critical disturbances and in a small design with few runs the loss of experimental runs may dramatically reduce analysis power. This article considers a common situation in process industry where the observed responses are represented by time series. A time series analysis approach to analyze two-level factorial designs affected by disturbances is developed and illustrated by analyzing a blast furnace experiment. In particular, a method based on transfer function-noise modeling is compared with a ‘traditional’ analysis using averages of the response in each run as the single response in an analysis of variance (ANOVA).
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| 8. |
- Vanhatalo, Erik, et al.
(författare)
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A method to determine transition time for experiments in dynamic processes
- 2011
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Ingår i: Quality Engineering. - : Informa UK Limited. - 0898-2112 .- 1532-4222. ; 23:1, s. 30-45
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Tidskriftsartikel (refereegranskat)abstract
- Process dynamics is an important consideration during the planning phase of designed experiments in dynamic processes. After changes of experimental factors, dynamic processes undergo a transition time before reaching a new steady state. To minimize experimental time and reduce costs and for experimental design and analysis, knowledge about this transition time is important. In this article, we propose a method to analyze process dynamics and estimate the transition time by combining principal component analysis and transfer function–noise modeling or intervention analysis. We illustrate the method by estimating transition times for a planned experiment in an experimental blast furnace.
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| 9. |
- Vanhatalo, Erik
(författare)
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Multivariate process monitoring of an experimental blast furnace
- 2010
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Ingår i: Quality and Reliability Engineering International. - : Wiley. - 0748-8017 .- 1099-1638. ; 26:5, s. 495-508
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Tidskriftsartikel (refereegranskat)abstract
- Process monitoring by use of multivariate projection methods has received increasing attention as it can reduce the monitoring problem for richly instrumented industrial processes with many correlated variables. This article discusses the monitoring and control of a continuously operating experimental blast furnace (EBF). A case study outlines the need for monitoring and control of the EBF and the use of principal components (PCs) to monitor the thermal state of the process. The case study addresses design, testing and online application of PC models for process monitoring. The results show how the monitoring problem can be reduced to following just a few PCs instead of many original variables. The case study highlights the problem of multivariate monitoring of a process with frequently shifting operating modes and process drifts and stresses the choice of a good reference data set of normal process behavior. Possible solutions for adaptations of the multivariate models to process changes are also discussed.
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| 10. |
- Vanhatalo, Erik, et al.
(författare)
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Towards improved analysis methods for two-level factorial experiments with time series responses
- 2013
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Ingår i: Quality and Reliability Engineering International. - : Wiley. - 0748-8017 .- 1099-1638. ; 29:5, s. 725-741
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Tidskriftsartikel (refereegranskat)abstract
- Dynamic processes exhibit a time delay between the disturbances and the resulting process response. Therefore, one has to acknowledge process dynamics, such as transition times, when planning and analyzing experiments in dynamic processes. In this article, we explore, discuss, and compare different methods to estimate location effects for two-level factorial experiments where the responses are represented by time series. Particularly, we outline the use of intervention-noise modeling to estimate the effects and to compare this method by using the averages of the response observations in each run as the single response. The comparisons are made by simulated experiments using a dynamic continuous process model. The results show that the effect estimates for the different analysis methods are similar. Using the average of the response in each run, but removing the transition time, is found to be a competitive, robust, and straightforward method, whereas intervention-noise models are found to be more comprehensive, render slightly fewer spurious effects, find more of the active effects for unreplicated experiments and provide the possibility to model effect dynamics. Copyright © 2012 John Wiley & Sons, Ltd. Copyright © 2012 John Wiley & Sons, Ltd.
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