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  • 1.
    Adamson, Göran
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. De Montfort University, UK.
    A Novel Method for Adaptive Control of Manufacturing Equipment in Cloud Environments2018Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The ability to adaptively control manufacturing equipment, both in local and distributed environments, is becoming increasingly more important for many manufacturing companies.

    One important reason for this is that manufacturing companies are facing increasing levels of changes, variations and uncertainty, caused by both internal and external factors, which can negatively impact their performance. Frequently changing consumer requirements and market demands usually lead to variations in manufacturing quantities, product design and shorter product life-cycles. Variations in manufacturing capability and functionality, such as equipment breakdowns, missing/worn/broken tools and delays, also contribute to a high level of uncertainty. The result is unpredictable manufacturing system performance, with an increased number of unforeseen events occurring in these systems. Events which are difficult for traditional planning and control systems to satisfactorily manage.

    For manufacturing scenarios such as these, the use of real-time manufacturing information and intelligence is necessary to enable manufacturing activities to be performed according to actual manufacturing conditions and requirements, and not according to a pre-determined process plan. Therefore, there is a need for an event-driven control approach to facilitate adaptive decision-making and dynamic control capabilities.

    Another reason driving the move for adaptive control of manufacturing equipment is the trend of increasing globalization, which forces manufacturing industry to focus on more cost-effective manufacturing systems and collaboration within global supply chains and manufacturing networks. Cloud Manufacturing is evolving as a new manufacturing paradigm to match this trend, enabling the mutually advantageous sharing of resources, knowledge and information between distributed companies and manufacturing units. One of the crucial objectives for Cloud Manufacturing is the coordinated planning, control and execution of discrete manufacturing operations in collaborative and networked environments. Therefore, there is also a need that such an event-driven control approach supports the control of distributed manufacturing equipment.

    The aim of this research study is to define and verify a novel and comprehensive method for adaptive control of manufacturing equipment in cloud environments.

    The presented research follows the Design Science Research methodology. From a review of research literature, problems regarding adaptive manufacturing equipment control have been identified. A control approach, building on a structure of event-driven Manufacturing Feature Function Blocks, supported by an Information Framework, has been formulated. The Function Block structure is constructed to generate real-time control instructions, triggered by events from the manufacturing environment. The Information Framework uses the concept of Ontologies and The Semantic Web to enable description and matching of manufacturing resource capabilities and manufacturing task requests in distributed environments, e.g. within Cloud Manufacturing. The suggested control approach has been designed and instantiated, implemented as prototype systems for both local and distributed manufacturing scenarios, in both real and virtual applications. In these systems, event-driven Assembly Feature Function Blocks for adaptive control of robotic assembly tasks have been used to demonstrate the applicability of the control approach. The utility and performance of these prototype systems have been tested, verified and evaluated for different assembly scenarios.

    The proposed control approach has many promising characteristics for use within both local and distributed environments, such as cloud environments. The biggest advantage compared to traditional control is that the required control is created at run-time according to actual manufacturing conditions.

    The biggest obstacle for being applicable to its full extent is manufacturing equipment controlled by proprietary control systems, with native control languages. To take the full advantage of the IEC Function Block control approach, controllers which can interface, interpret and execute these Function Blocks directly, are necessary.

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  • 2.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Moore, Philip
    Academy for Innovation & Research, Falmouth University, Cornwall, United Kingdom.
    Cloud Manufacturing: A Critical Review of Recent Development and Future Trends2017In: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 30, no 4-5, p. 347-380Article in journal (Refereed)
    Abstract [en]

    There is an on-going paradigm shift in manufacturing, in which modern manufacturing industry is changing towards global manufacturing networks and supply chains. This will lead to the flexible usage of different globally distributed, scalable and sustainable, service-oriented manufacturing systems and resources. Combining recently emerged technologies, such as Internet of Things, Cloud Computing, Semantic Web, service-oriented technologies, virtualisation and advanced high-performance computing technologies, with advanced manufacturing models and information technologies, Cloud Manufacturing is a new manufacturing paradigm built on resource sharing, supporting and driving this change.

    It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities and equipment, will then be made accessible to presumptive consumers on a worldwide basis.

    Cloud Manufacturing has been in focus for a great deal of research interest and suggested applications during recent years, by both industrial and academic communities. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with identified outstanding research issues, and future trends and directions within Cloud Manufacturing.

  • 3.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Feature-based Function Block Control Framework for Manufacturing Equipment in Cloud Environments2018In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 57, no 12, p. 3954-3974Article in journal (Refereed)
    Abstract [en]

    The ability to adaptively control manufacturing equipment in cloud environments is becoming increasingly more important. Industry 4.0, supported by Cyber Physical Systems and the concept of on-demand, scalable and pay-for-usage resource-sharing in cloud environments offers many promises regarding effective and flexible manufacturing. For implementing the concept of manufacturing services in a cloud environment, a cloud control approach for the sharing and control of networked manufacturing resources is required. This paper presents a cloud service-based control approach which has a product perspective and builds on the combination of event-driven IEC 61499 Function Blocks and product manufacturing features. Distributed control is realised through the use of a networked control structure of such Function Blocks as decision modules, enabling an adaptive run-time behaviour. The control approach has been developed and implemented as prototype systems for both local and distributed manufacturing scenarios, in both real and virtual applications. An application scenario is presented to demonstrate the applicability of the control approach. In this scenario, Assembly Feature-Function Blocks for adaptive control of robotic assembly tasks have been used.

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  • 4.
    Ahmed, Zakarie
    et al.
    University of Skövde, School of Engineering Science.
    Nasani, Rami
    University of Skövde, School of Engineering Science.
    Modellering och emulering av en människa- robot samarbetande arbetscell2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Collaborative robots are a key challenge in industrial development. The problem today is that industrial robots are not adapted for close collaboration with humans and security gates are a need. This study focuses on developing an emulation model that can demonstrate such collaboration without the need for security gates. The project is based on the concept (virtual commissioning) which is about using emulation tools to develop a digital twin that is a copy of a physical system. With the help of the model, the system's functions and program code will be tested and validated before a real implementation is performed. On behalf of the University of Skövde, the thesis work was carried out to investigate the possibility of a close collaboration between a person and industrial robot in a virtual environment. In the study, two different methods have been developed to investigate the possibility of a collaboration but also to develop an emulation model. With this, operating lists have been created to clarify the person and the robot work tasks. Process scenarios were then created to demonstrate how such collaboration can take place in a virtual environment. A functioning emulation model in which man and robot collaborate, was delivered to the University of Skövde. By using the emulation model, the university can create and test different solutions before an implementation of a real system takes place. Finally, an emulation method is proposed that can be used to develop a digital twin.

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  • 5.
    Amenabar, Leire
    et al.
    University of Skövde, School of Engineering Science.
    Carreras, Leire
    University of Skövde, School of Engineering Science.
    Augmented Reality Framework for Supporting and Monitoring Operators during Maintenance Operations in Industrial Environments2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In an ever-changing and demanding world where short assembly and innovation times are indispensable, it is of paramount importance to ensure that the machinery used throughout the whole process of a product are in their best possible condition. This guarantees that the performance of each machine will be optimal, and hence, the process times will be the shortest possible, while the best quality products are obtained. Moreover, having a machine in an impeccable status permits making the necessary changes to it, in order to fulfil the requirements that a more advanced or complex product may have. Maintenance operations and their corresponding trainings have historically been time-consuming, and a vast amount of information has been transmitted from an expert to a newer operator. This means that there has been the need of working with experienced operators to secure that a good service is provided. However, different technologies like augmented reality (AR) have been shown to have a positive impact in the support and monitoring of operators in industrial maintenance operations.The present project gathers information in regard to the framework of AR, with the aim of supporting and monitoring operators in industrial environments. The proposed method consists on the development of an artefact, which would lead to a possible improvement of the already existing solutions. It is believed that the development of an AR application could grant the necessary aid to any operator in maintenance operations. The result of this suggestion is an AR application which superimposes visual information on the physical equipment.

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  • 6.
    Andersson, Kim
    University of Skövde, School of Informatics.
    Effekten av game feel: Hur tillägget av ren game feel påverkar en spelares immersion, jämfört med tillägget av detaljerad grafik, i ett actionspel med kort utvecklingstid2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta arbete är att jämföra effekterna av game feel och detaljerad grafik på en spelares immersion. Arbetet är riktat mot korta produktioner och har som mål att redovisa data som gör att spelutvecklare kan göra informerade val vid implementation av funktionalitet och grafik. Tre prototyper skapades för att mäta spelarnas immersion: en med abstrakt grafik, en med detaljerad grafik och en med game feel. Försökpersonernas upplevelse av prototyperna samlades in med hjälp av en webbbaserad enkät. Försökpersonernas svar visar inga säkra resultat men pekar på att försökspersonerna som spelade prototypen med game feel upplevde mest immersion.

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  • 7.
    Andreasson, Rebecca
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Lindblom, Jessica
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Thorvald, Peter
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Distributed Cognition in Manufacturing: Collaborative Assembly Work2016In: Advances in Manufacturing Technology XXX / [ed] Yee Mey Goh, Keith Case, IOS Press, 2016, p. 243-248Conference paper (Refereed)
    Abstract [en]

    Cognitive science is becoming increasingly central within humanfactors and ergonomics (HF&E) and there has long been a call for a more systemicperspective in the area with a somewhat broader unit of analysis. This paperpresents a case study applying the theoretical framework of distributed cognition(DCog), which shows how DCog would offer a more complete understanding ofmanufacturing within its greater context, including the social, cultural, andmaterial surroundings. This paper aims to characterize and analyse dock assemblyof forest machines as a complex socio-technical system from a DCog perspective;focusing on the creation of enacted landscapes in this particular setting. The paperalso exemplifies benefits of using the DCog framework in the manufacturingdomain as a way of grasping the assembly workers’ tacit competence and skills.

  • 8.
    Andreasson, Rebecca
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Lindblom, Jessica
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Thorvald, Peter
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Interruptions in the wild: portraying the handling of interruptions in manufacturing from a distributed cognition lens2017In: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 19, no 1, p. 85-108Article in journal (Refereed)
    Abstract [en]

    This paper presents a study examining interruptionsin the wild by portraying the handling of interruptionsin manufacturing from a distributed cognitionlens. By studying how interruptions occur and are handledin the daily activities of a work team at a large foundry forcasting heavy diesel engines, we highlight situations whenthe propagation, transformation, and representation ofinformation are not supported by prescribed work processesand propose recommendations for how this can beamended. The study was conducted by several visits to theaforementioned factory with cognitive ethnography as thebasis for the data collection. The focus was on identifyinginterruptions and analysing these through a distributedcognition framework as an initial step towards studyinginterruptions in a manufacturing environment. The keyfindings include the identification of three, previouslyundefined, types of interruptions and the conclusion thatinterruptions do indeed affect the distributed workload ofthe socio-technical system and thus the overall productionperformance at the casting line.

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  • 9.
    Arambarri Iglesias, Oihane
    et al.
    University of Skövde, School of Engineering Science.
    Arauzo Sanchez, Ane
    University of Skövde, School of Engineering Science.
    Design of a medical mask for users with Multiple Chemical Sensitivity2016Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Within this degree project a conceptual design of a mask has been developed for people with Multiple Chemical Sensitivity due to the lack of this kind of product in the market. The users currently use different masks that are designed to be used in other activities.  A preliminary study has been performed where market, ergonomics, materials and use situations have been analysed to gather knowledge to define the specifications of the product. Even if  the aesthetics of the first version of the product’s design was related to a health care design style, after obtaining results, it was observed that the wishes of the users weren’t being fulfilled. After updating the specifications and the generation phase three possible concepts have been presented. The evaluation has been done within the design group and the target users from the Basque association “Bizi-Bide”. The final conceptual design has been developed regarding different aspects such as ergonomics, materials, components and graphic design. The project has resulted in a concept of an innovative mask, which has a mouldable part for the nose and cheeks, a Velcro fastener to adapt it to different head measurements and exchangeable filters. 

  • 10.
    Aslam, Tehseen
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Pehrsson, Leif
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Volvo Car Engine, Manufacturing Research and Concepts, Skövde, Sweden.
    Urenda-Moris, Mathias
    Uppsala University, Ångströmlaboratoriet, Uppsala, Sweden.
    Towards an industrial testbed for holistic virtual production development2018In: Advances in Manufacturing Technology XXXII: Proceedings of the 16th International Conference on Manufacturing Research, incorporating the 33rd National Conference on Manufacturing Research, September 11–13, 2018, University of Skövde, Sweden / [ed] Peter Thorvald, Keith Case, Amsterdam: IOS Press, 2018, p. 369-374Conference paper (Refereed)
    Abstract [en]

    Virtual production development is adopted by many companies in the production industry and digital models and virtual tools are utilized for strategic, tactical and operational decisions in almost every stage of the value chain. This paper suggest a testbed concept that aims the production industry to adopt a virtual production development process with integrated tool chains that enables holistic optimizations, all the way from the overall supply chain performance down to individual equipment/devices. The testbed, which is fully virtual, provides a mean for development and testing of integrated digital models and virtual tools, including both technical and methodological aspects.

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  • 11.
    Backlund, Per
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Maurin Söderholm, Hanna
    University of Borås, Sweden.
    Engström, Henrik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Andersson Hagiwara, Magnus
    University of Borås, Sweden.
    Lebram, Mikael
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Breaking Out of the Bubble Putting Simulation Into Context to Increase Immersion and Performance2018In: Journal Simulation & Gaming, ISSN 1046-8781, E-ISSN 1552-826X, Vol. 49, no 6, p. 642-660Article in journal (Refereed)
    Abstract [en]

    Objective. Simulation based training with full-size mannequins is a prominent means of training within the healthcare sector. Prehospital missions include all parts of the healthcare process which take place before a patient is handed over to the receiving hospital. This implies that the context for prehospital care is varied and potentially challenging or dangerous in several ways. In this article we present a study which explores immersion and performance by emergency medical services (EMS) professionals in in a training situation which takes the specifics of prehospital interventions into account.

    Methods. The study was carried out as a field experiment at an ambulance unit. The experiment was designed to compare the differences between two types of medical scenarios: basic and contextualized. We analyzed the levels of immersion throughout the scenarios and then team performance was evaluated by independent experts. Both analyses were made by observing video recordings from multiple camera angles with a custom made analysis tool.

    Results. Our results show that the contextualization of a medical scenario increases both immersion as measured by the Immersion Score Rating Instrument (ISRI) and team performance as measured by the Global Rating Scale (GRS). The overall ISRI score was higher in the contextualized condition as compared to the basic condition, with an average team wise difference of 2.94 (sd = 1.45). This difference is significant using a paired, two-tailed t-test (p<.001). The GRS score was higher for overall clinical performance in the contextualized scenario with an average team wise difference of 0.83 (sd = 0.83, p=.005).

    Conclusions. Full-size mannequin simulation based training for EMS professionals may be enhanced by contextualizing the medical scenarios. The main benefits are that the contextualized scenarios better take prehospital medical challenges into account and allow participants to perform better.

  • 12.
    Barrera Diaz, Carlos Alberto
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Simulation-based multi-objective optimization for reconfigurable manufacturing systems: Reconfigurability, manufacturing, simulation, optimization, rms, multi-objective, knowledge discovery2023Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    In today’s global and aggressive market system, for manufacturing companies to remain competitive, they must manufacture high-quality products that can be produced at a low cost; they also must respond efficiently to customers’ predictable and unpredictable needs and demand variations. Increasingly shortened product lifecycles, as well as product customization degrees, lead to swift changes in the market that need to be supported by capable and flexible resources able to produce faster and deliver to the market in shorter periods while maintaining a high degree of cost-efficiency. To cope with all these challenges, the setup of production systems needs to shift toward Reconfigurable Manufacturing Systems (RMSs), making production capable of rapidly and economically changing its functionality and capacity to face uncertainties, such as unforeseen market variations and product changes. Despite the advantages of RMSs, designing and managing these systems to achieve a high-efficiency level is a complex and challenging task that requires optimization techniques. Simulation-based optimization (SBO) methods have been proven to improve complex manufacturing systems that are affected by predictable and unpredictable events. However, the use of SBO methods to tackle challenging RMS design and management processes is underdeveloped and rarely involves Multi-Objective Optimization (MOO). Only a few attempts have applied Simulation-Based Multi-Objective Optimization (SMO) to simultaneously deal with multiple conflictive objectives. Furthermore, due to the intrinsic complexity of RMSs, manufacturing organizations that embrace this type of system struggle with areas such as system configuration, number of resources, and task assignment. Therefore, this dissertation contributes to such areas by employing SMO to investigate the design and management of RMSs. The benefits for decision-makers have been demonstrated when SMO is employed toward RMS-related challenges. These benefits have been enhanced by combining SMO with knowledge discovery and Knowledge-Driven Optimization (KDO). This combination has contributed to current research practices proving to be an effective and supportive decision support tool for manufacturing organizations when dealing with RMS challenges.

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  • 13.
    Berg Marklund, Björn
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Out of Context: Understanding the Practicalities of Learning Games2014In: DiGRA '14 - Proceedings of the 2014 DiGRA International Conference, Snowbird, UT: Digital Games Research Association (DiGRA) , 2014, , p. 16Conference paper (Refereed)
    Abstract [en]

    The aim of this paper is to highlight the lack of studies examining the contexts in which learning games are used. Learning game research tends to focus heavily on the game artefact by examining how different types of designs foster both engagement and learning and how well the axiomatic definitions of good game design correspond to sound learning principles. While the dissection of the anatomy of games is important, there is an overabundance of studies on learning games as isolated systems at the expense of examinations of the constraints, possibilities, and requirements imposed by their real-world context of use. Learning games that are intended to work in formal settings like K-12 classrooms constitute systems that significantly differ from the traditional game scenarios between game artefacts and their players. As of yet few researchers have set out to survey these systems in their entirety. This paper presents a small literature review of learning game research that highlight the absence of studies focused on understanding the practicalities of the development and use of learning games. The paper also juxtaposes the results of the review with outcomes of a study conducted “within” the identified gap to present arguments for why the current lack of practical research is problematic. 

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  • 14.
    Bergman, Camilla
    et al.
    University of Skövde, School of Technology and Society.
    Nilsson, Anna
    University of Skövde, School of Technology and Society.
    Utveckling av sängarmatur för hotellmiljö: ett projekt i samarbete med LuxoSverige AB2008Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The main goal was to develop an armature with the new Light Emitting Diode technique. During the process different solutions for flexibility of placement and light adjustment were created. Two concepts were developed, one with the armature placed on the wall and one placed on the night stand, both with telescopic function and a flexible tube arm.

    The result of this project was an armature intended to be placed on the night stand. This product could be the first in Sweden to be environmental labeled with the Swan label. The armature has the typical shape of Luxos products. The form follows the function with decorative details and unusual functions, as for example a USB-contact

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    FULLTEXT01
  • 15.
    Birtic, Martin
    University of Skövde, School of Engineering Science.
    An Open Data Model for Emulation Models of Industrial Components2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Emulation is a technology, historically mostly used for virtual commissioning of automated industrial systems, and operator training. Trends show that new areas for deployment are being investigated. One way to broaden the scope of emulation technology is to increase emulation detail level. The University of Skövde conduct research within emulation technology, and are developing a higher detail level emulation platform performing  on component level. For transparent and systematic development of component models on this level, an open, extensible, and flexible data model for emulation models of industrial components is wanted. This thesis is contributing to this endeavour by developing a first draft of such a data model. A demonstration is also conducted by implementing a few components into the developing emulation environment, using XML as file format. An iterative "design and creation" methodology was used to develop and implement an object oriented data model. A selected set of industrial components were used to develop and demonstrate the data model, and the final result is visually represented as a class diagram together with explanatory documentation. Using the methodology and data modelling strategy used in this thesis, systematic and transparent development of emulation models on component level is possible in an extensible and flexible manner.

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    AnOpenDataModel
  • 16.
    Birtic, Martin
    University of Skövde, School of Engineering Science.
    SUGGESTIONS TO CONSIDER WHEN ENGAGING IN THE PROCESS OF DEVELOPING A SYSTEM DYNAMICS MODEL FOR FREQUENT ATTENDERS IN HEALTHCARE2019Independent thesis Advanced level (degree of Master (One Year)), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Healthcare systems face many challenges that prevent them from reaching their full potential. Overcoming these challenges can be very difficult in part because of their complexity. Predicting all the possible effects that improvement attempts may create is difficult and high-quality decision support material is difficult to obtain. System dynamics modeling and simulation is a technology that has been applied for some time within the healthcare domain in order to assist the decision-making process. This technology has gained increased interest in the domain over the past decade. This project analyses the application of system dynamics modeling to a specific problem in the healthcare sector, namely that of frequent attenders to the emergency department. A literature review is performed to extract suggestions that could be considered when engaged in the process of developing a system dynamics model for managing frequent attenders in healthcare. It has been found that the research on frequent attenders and their management is very heterogeneous and ambiguous making it difficult to draw strong conclusions about the effectiveness of different management strategies. Model builders are forced to turn to other sources for model data. It is also found that system dynamics modeling of frequent attenders has not yet been done. This situation led to the expansion of the search scope to include related modeling research as the basis for suggestion extraction. 65 suggestions are extracted into three broad categories with the limitation of not being strictly specific to the modeling of frequent attenders, but have a more general nature. And although their value is not evaluated, it is hoped that they could contribute as inspiration to certain system dynamics model development endeavors.

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  • 17.
    Bystedt, Pontus
    University of Skövde, School of Humanities and Informatics.
    BILLBOARDS I SPEL: En illusion av 3d-karaktärer2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Billboarding är en teknik som ofta används i tv- eller dataspel för att prestandaeffektivt skapa objekt i en spelmiljö. Tekniken går ut på att istället för en 3d-modell ritas en bild med genomskinlig bakgrund ut på ett polygonplan som alltid vrids mot spelaren. Hur skulle detta kunna utvecklas? Problemformuleringen för denna studie lyder: Hur uppfattar betraktaren karaktärer som representeras av billboards ur flera vinklar istället för en 3d-modell?En spelmiljö med både 3d-karaktärer och billboardskaraktärer skapades. Billboardskaraktärerna bestod av bilder av 3d-karaktärerna för att ge illusionen av att de också var 3d-karaktärer. Kvalitativa intervjuer genomfördes för att ta reda på olika respondenters uppfattning om dessa billboardskaraktärer. Resultatet blev positivt. Även om ett fåtal kunde skilja på 3d-karaktärerna och billboardskaraktärerna kunde ingen genomskåda att billboardskaraktärerna inte var 3d-karaktärer. Resultatet skulle kunna utvecklas ytterligare genom att testa billboardskaraktärer på detta sätt i en större miljö och/eller använda videotexturer istället för bilder.

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    a11ponby_Examensarbete
  • 18.
    Eriksson, Gustav
    University of Skövde, School of Informatics.
    Meningsfull dialog: Spelarens upplevda agency i dialoger2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Det här arbetet syftar till att redogöra för en studie i spelarens upplevda agency i dialogsammanhang. Arbetet tar sin bakgrund i talaktsteori och känslor som hjälpmedel vid dialogsystemsdesign. Frågeställningen söker sedan svara på om ett dialogsystem av typen abstract response menu är effektivast med eller utan det så kallade känslohjulet.

    Känslohjulet kombinerar en abstrakt fras med en känsla. Spelaren väljer känslan genom att rotera ett hjul med färger. För att testa spelarens upplevda agency fick två testgrupper testa respektive dialogsystem och fylla i ett formulär relaterat till deras upplevda agency.

    Resultatet visade att inget av dialogsystemen var nämnvärt bättre än det andra. Däremot framkom det att vissa spelarens motivation som ett uttryck av agency påverkades annorlunda av känslohjulet då spelaren upplevde en högre nivå av självuttryck.

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  • 19.
    Flores Garcia, Erik
    et al.
    Mälardalen University, Eskilstuna, Sweden.
    Ruiz Zúñiga, Enrique
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bruch, Jessica
    Mälardalen University, Eskilstuna, Sweden.
    Urenda Moris, Matias
    Division of Industrial Engineering and Management, University of Uppsala, Uppsala, Sweden.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Simulation-based Optimization for Facility Layout Design in Conditions of High Uncertainty2018In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, p. 334-339Article in journal (Refereed)
    Abstract [en]

    Despite the increased use of Simulation based Optimization, the design of facility layout is challenged by high levels of uncertainty associatedwith new production processes. Addressing this issue, this paper aims to understand the conceptual modeling activities of Simulation-basedOptimization for facility layout design in conditions of high uncertainty. Based on three in-depth case studies, the results of this paper showhow characterization criteria of production systems can be used in conceptual modelling to reduce uncertainty. These results may be essentialto support managers and stakeholders during the introduction of new production processes in the design of facility layouts.

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  • 20.
    Fornlöf, Veronica
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Galar, Diego
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Almgren, Torgny
    GKN Aerospace Engine Systems, Trollhättan, Sweden.
    Catelani, Marcantonio
    Department of Information Engineering, University of Florence, Florence, Italy.
    Ciani, Lorenzo
    Department of Information Engineering, University of Florence, Florence, Italy.
    Maintenance, prognostics and diagnostics approaches for aircraft engines2016In: 3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016: Proceedings, IEEE, 2016, p. 403-407Conference paper (Refereed)
    Abstract [en]

    In avionics application one of the most important competition factors is the reliability, given that the failure occurrence may leads to a critical state for the functioning of the aircraft. Different maintenance, prognostics and diagnostics approaches are possible with the final aim to optimize both system's availability and safety. Aircraft engines represent a safety critical part of the airplane. For this reason it is a key issue to allocate the proper amount of maintenance at each individual maintenance event. In this paper a mathematical replacement model is proposed to guarantee that the correct amount of maintenance is performed.

  • 21.
    Frantzén, Marcus
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Holm, Magnus
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Karlsson, V.
    Volvo Group Trucks Operations, Powertrain Production Skövde, Skövde, Sweden.
    Bremert, M.
    Volvo Group Trucks Operations, Powertrain Production Skövde, Skövde, Sweden.
    Dynamic maintenance priority of a real-world machining line2016In: Proceedings of the 7th Swedish Production Symposium, 2016Conference paper (Refereed)
    Abstract [en]

    To support the shop-floor operators, decision support systems (DSS) are becoming more and more vital to the success of manufacturing systems in industry today. In order to get a DSS able to adapt to disturbances in a production system, on-line data are needed to be able to make optimal or near-optimal decisions in real-time (soft real-time). This paper investigates one part of such a system, i.e. how different priorities of maintenance activities (planned and unplanned) affect the productivity of a production system. A discrete-event simulation model has been built for a real-world machining line in order to simulate the decisions made in subject to disturbances. This paper presents a way of prioritizing operators and machines based on multiple criteria such as competence, utilization, distance, bottleneck, and Work-In-Process. An experimental study based on the real-world production system has shown promising results and given insights of how to prioritize the operators in a good way. Another novelty introduced in this paper is the use of simulation-based optimization to generate composite dispatching rules in order to find good tradeoffs when taking a decision of which machine or operator to select.

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  • 22.
    García Martín, Rafael Adrián
    et al.
    University of Skövde, School of Engineering Science. Universidad de Málaga, Escuela Técnica Superior de Ingeniería Industrial.
    Gaspar Sánchez, José Manuel
    University of Skövde, School of Engineering Science. Universidad de Málaga, Escuela Técnica Superior de Ingeniería Industrial.
    Screening for important factors in large-scale simulation models: some industrial experiments2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The present project discusses the application of screening techniques in large-scale simulation models with the purpose of determining whether this kind of procedures could be a substitute for or a complement to simulation-based optimization for bottleneck identification and improvement.

    Based on sensitivity analysis, the screening techniques consist in finding the most important factors in simulation models where there are many factors, in which presumably only a few or some of these factors are important. The screening technique selected to be studied in this project is Sequential Bifurcation. This method consists in grouping the potentially important factors, dividing the groups continuously depending on the response generated from the model of the system under study.

    The results confirm that the application of the Sequential Bifurcation method can considerably reduce the simulation time because of the number of simulations needed, which decreased compared with the optimization study. Furthermore, by introducing two-factor interactions in the metamodel, the results are more accurate and may even be as accurate as the results from optimization. On the other hand, it has been found that the application of Sequential Bifurcation could become a problem in terms of accuracy when there are many storage buffers in the decision variables list.

    Due to all of these reasons, the screening techniques cannot be a complete alternative to simulation-based optimization. However, as shown in some initial results, the combination of these two methods could yield a promising roadmap for future research, which is highly recommended by the authors of this project.

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    Screening for important factors in large-scale simulation models: some industrial experiments
  • 23.
    Gil Besi, Manuel
    et al.
    University of Skövde, School of Technology and Society.
    Villatoro Palomar, Delia
    University of Skövde, School of Technology and Society.
    Design of  a CAD and Rapid Prototyping based production process for porcelain2008Independent thesis Basic level (degree of Bachelor), 15 points / 22,5 hpStudent thesis
    Abstract [en]

    The present work has as aim implementing a CAD and rapid prototyping based production process in a porcelain company. There is considerable interest in ceramic companies in implementing new digital technologies in an old-fashioned industry, where traditional handscraft predominate.

     

    The work is carried out in collaboration with Rörstrand Kulturforum AB, whose current process is analyzed, pointing out strengths and weaknesses, to define where to set the focus and the actions to perform. This analysis goes from early stages of product design to slipcasting clay bodies, the forming process of porcelain that uses plaster moulds.

     

    As a result of this analysis, some alternatives including rapid prototyping and CNC milling techniques are defined and compared to one another. Eventually, the definitive solution features CNC milling as the main prototyping system, shaping the mother moulds out of a polyurethane block. This process skips some initial steps, such as manual modelling and mould casting, resulting saving in the new product development. Anyhow, the new process is yet to be tested in the company’s own environment to fully implement it, regarding to various parameters such as the size of the production and the complexity of the products to be manufactured.

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  • 24.
    Gustavsson, Patrik
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    A New Algorithm Using the Non-dominated Tree to improve Non-dominated Sorting2018In: Evolutionary Computation, ISSN 1063-6560, E-ISSN 1530-9304, Vol. 26, no 1, p. 89-116Article in journal (Refereed)
    Abstract [en]

    Non-dominated sorting is a technique often used in evolutionary algorithms to determine the quality of solutions in a population. The most common algorithm is the Fast Non-dominated Sort (FNS). This algorithm, however, has the drawback that its performance deteriorates when the population size grows. The same drawback applies also to other non-dominating sorting algorithms such as the Efficient Non-dominated Sort with Binary Strategy (ENS-BS). An algorithm suggested to overcome this drawback is the Divide-and-Conquer Non-dominated Sort (DCNS) which works well on a limited number of objectives but deteriorates when the number of objectives grows. This paper presents a new, more efficient, algorithm called the Efficient Non-dominated Sort with Non-Dominated Tree (ENS-NDT). ENS-NDT is an extension of the ENS-BS algorithm and uses a novel Non-Dominated Tree (NDTree) to speed up the non-dominated sorting. ENS-NDT is able to handle large population sizes and a large number of objectives more efficiently than existing algorithms for non-dominated sorting. In the paper, it is shown that with ENS-NDT the runtime of multi-objective optimization algorithms such as the Non-Dominated Sorting Genetic Algorithm II (NSGA-II) can be substantially reduced.

  • 25.
    Hansson, Hampus
    et al.
    University of Skövde, School of Engineering Science.
    Jonsson, Linn
    University of Skövde, School of Engineering Science.
    Utveckling av ett användarcentrerat handmanöverdon för AGV:er2023Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With the growing automation in industry, more AGVs (Automated Guided Vehicles) are used, which are driverless trucks as, for example, an aid in material handling in industry. Although AGVs are automated, there is an associated hand control device for driving in manual mode. However, today's hand control device is described as "unergonomic and difficult to understand" by the users. Therefore, it is important to develop the product to improve the user experience. The project has been carried out in collaboration with EA Mobile Robotics, which develops, manufactures and delivers AGVs and automation solutions. During the development work, preliminary studies, concept generation, evaluation and detailed design were carried out. In the preliminary study, knowledge and data were collected from relevant literature and methods such as interviews and observations, which were carried out to map the user's needs. The personas and requirements specification showed important aspects for the work, such as, safety, functionality, usability and physical ergonomics. Concept development consisted of brainstorming and morphological analysis and resulted in four concepts. These were tested in user tests in order, together with a concept weighting matrix, to be the basis for concept selection. Two concepts were further developed before the final concept was chosen. This resulted in a new concept for a hand control device that was more ergonomic, both physically and cognitively. The concept fulfilled the set requirements to a large extent and was more usercentered than at present. The control device had the desired functions and an ergonomic shape. It will also help to make the use more user centered.

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  • 26.
    Högberg, Dan
    University of Skövde, Department of Engineering Science.
    Use of characters and scenarios in gear shift design2003In: DPPI '03: Proceedings of the 2003 international conference on Designing pleasurable products and interfaces, Association for Computing Machinery (ACM), 2003, p. 140-141Conference paper (Refereed)
    Abstract [en]

    The employment of the design methods of characters and scenarios in the conceptual design of a gearshift system for future automobiles is presented. The main objective for the project was to provide design suggestions for a gearshift system that people will appreciate in future cars in view of market trends, technology developments and environmental demands. The methods were tested for concept evaluation at a Swedish car component manufacturer. The methods gave rough, but important, indications of possible appreciation and acceptance of design proposals, and assisted consideration of user diversity. This low-cost approach is sufficient for evaluation purposes at early design stages, but may be complemented with more thorough studies if time and money permits.

  • 27.
    Inglot, Agnieszka
    et al.
    University of Skövde, School of Engineering Science.
    Franzén, Oskar
    University of Skövde, School of Engineering Science.
    PREVENTION OF WHEEL WEAR, A CASE STUDY: Developing a functioning wheel profile for rail-mounted transportation trolley.2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This bachelor’s degree project aimed to improve the wheel profile of a rail mounted trolley and determine the cause of wheel failure. The proceedings of this project where modelled after an approach for solving wear problems with an emphasis on designing for sustainability. A case study and root cause analysis (RCA) was performed and the flanged wheels were deemed insufficient for the given heavy-haul system. Possible areas of wheel profile improvement were identified and further researched with multiple literature reviews. Throughout the projects duration several limitations were introduced that reduced the concept testing to exclusively theoretical prediction models. Archard’s model was implemented to predict wear and operating time for the proposed material and wheel tread profile concepts. The wheel flange dimensions were chosen based on recommendations from wheel and rail interference handbooks among other sources. The final wheel and rail profile suggestion improved operating time by approximately 300% and wear resistance by 50% compared to its predecessor. This result was achieved by applying the same theoretical prediction model to both current and suggested profiles. The findings of this project are meant to aid SCA among others in similar cases and additionally highlight the value of product improvement from a technological, sociological, and environmental perspective.

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    Prevention of Wheel Wear- A Case Study
  • 28.
    Isaksson Eriksson, Anton
    University of Skövde, School of Informatics.
    Navigering med hjälp av ambience inom ett ljudspel2021Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Följande studie ämnar undersöka hur spelare upplever ljudspel, vars navigation helt förlitar sig på ljuddesign. Frågeställningen är: ”Går det att skapa ett ljudspel som utnyttjar ambiencen till att hitta spelarens riktning och lokalisera sig utan att förlora spelarens upplevelse?”. För att undersöka detta har en artefakt, bestående av två olika versioner av ett ljudspel, skapats där grunden att lokalisera sig baseras på tidigare forskning inom ljudspel och analys av kommersiella ljudspel. Metoden som använts är en kvalitativ enkätstudie, där 5 st deltagare mellan 18–29 år som inte tidigare testat ljudspel, testat båda versionerna av artefakten för att jämföra och kommentera kring sin upplevelse av navigeringen. Deltagarna har kunnat utnyttja navigeringen i båda versionerna utan att ha förlorat upplevelsen av spelet. Båda versionerna föredrogs av samma antal deltagare. Det betyder att ambience går att använda som navigationshjälpmedel i ljudspel utan att riskera spelupplevelsen.

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  • 29.
    Jacobs, Stephan
    University of Skövde, School of Engineering Science.
    Genetic algorithm for schedule optimization in the homecare industry2018Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In the last couple of years, the development within the Artificial Intelligence, AI, has rapidly improved with more and more applications to ease daily live. These applications of AI are countless and can lead to a more sustainable and efficient world. AI is there to solve complex problems which are hard to handle by hand for people and give solutions which would otherwise be not reachable in the same timeframe by considering the same variables. One of the applications of AI is to solve scheduling problems, such as the scheduling optimization problem within the homecare industry. Scheduling within the homecare industry is highly demanding since the problem is very complex due to the many different variables which are dependent on each other. Next to this the industry is dynamic in which members and clients come and go. Within the homecare industry employees, from now on called members, are visiting clients for treatments. These visits are at the clients’ home with a certain length and frequency a week, which is different per client. Next to this a client can have multiple assigned members in which they alternate each other. Next to this the client has his or her private schedule with their availability, which are constraints the schedule maker has to take into account. As an understanding of the problem the case study of Malmo stad is used to receive data and develop an algorithm around. The main objective is to develop a programme which solves the scheduling problem within the homecare industry. For this feasible results are needed which thereby meet the constraints of availability, treatment lengths and frequencies, with high importance of the objective of minimizing the travel time. To get sustainable and efficient schedules the algorithm should find the schedule in which the travel time is the lowest. To address the problem, the research strategy of design and development is used. In this the literature in combination with the case study is used to develop and verify the program Within this project an algorithm is developed on the base of a Genetic Algorithm, GA, within MATLAB. Within the GA the fitness of the individuals is determined by feasibility and if the population has reached the maximum fitness, which is that the schedule is feasible and meets the constraints, goes into a fitness which graded by travel time in which minimum travel time is the most optimum. The programme gives as result the schedule per member within the Area for one week. Overall can be concluded that GA can be a solution to address the scheduling optimization problem for the Homecare industry. The algorithm gives solutions which are sufficient and logic. Nevertheless, with a lack of previous data within the industry and no comparison algorithms the verification of the algorithm is hard. Future work has to determine the performance of the GA with respect to this problem.

  • 30.
    Johansson, Oscar
    University of Skövde, School of Informatics.
    Perspektiv och stress: Kameraperspektivets inverkan på puls och upplevd stress i ett endless runner-spel2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Endless runners är en genre inom plattformsspel - populär framförallt på mobila enheter. Spelen kännetecknas ofta av konstant stegrande hastighet på oändliga spelbanor. För att besvara studiens frågeställning skapades en spelprototyp i endless runner-stil med två olika versioner, spelbara ur var sitt kameraperspektiv. De två mest förekommande kameraperspektiven inom genren valdes ut: tredjepersonsperspektivet och ”sidscrollande” perspektivet. En undersökning på två grupper utfördes där de speltestade spelversionerna i ombytta ordningar. Innan och efter speltestet besvarades enkäter innehållande datainsamlande frågor och rankning av upplevd stress. Innan testet togs en vilopuls och under testet togs kontinuerligt forskningsdeltagarnas puls. En slutsats var svår att dra av de resultat som framkom. Forskningsdeltagarnas upplevda stress var spridd, cirka sjuttio procent av deltagarna uppgav att det ”sidscrollande” perspektivet var mer stressigt, men pulsmätningarna visade på en högre puls för tredjepersonsperspektivet. Detta ansågs bero på att deltagarna ”överlevde” längre och således ökade deras puls ju längre de kom.

  • 31.
    Jägstam, Mats
    et al.
    University of Skövde, School of Technology and Society.
    Oscarsson, Jan
    University of Skövde, School of Technology and Society.
    De Vin, Leo J.
    University of Skövde, School of Technology and Society.
    Implementation in Industry of a Handbook for Simulation Methodology2004In: Proceedings 37th CIRP International Seminar on Manufacturing Systems: Digital enterprises, production networks / [ed] László Monostori, Budapest: MTA SZTAKI , 2004, p. 427-432Conference paper (Refereed)
  • 32.
    Kolbeinsson, Ari
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Thorvald, Peter
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Lindblom, Jessica
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Coordinating the interruption of assembly workers in manufacturing2017In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 58, p. 361-371Article in journal (Refereed)
    Abstract [en]

    This paper examines how interruptions from information and communications technology systems affect errors and the time to complete tasks for assembly workers. Interruptions have previously been examined in laboratory experiments and office environments, but not much work has been performed in other authentic environments. This paper contains the results of an experiment that was performed in a simulated manufacturing assembly environment, which tested the effects of interruptions on a manual assembly task. The experiment used existing interruption coordination methods as a basis, and the results showed a difference in the effect of interruptions and interruption coordination between cognitively complex laboratory tasks and manual assembly tasks in an authentic environment. Most notably, the negative effects of interruptions delivered without consideration were smaller in this experiment. Based on these findings, recommendations were developed for designing interruption systems for minimizing the costs (errors and time) imposed by interruptions during assembly tasks in manufacturing.

  • 33.
    Koohnavard, Saina
    et al.
    Högskolan i Borås.
    Tepe, Jan
    Högskolan i Borås.
    Johansson, Veronica
    University of Skövde, School of Informatics.
    Arltoft, Emma
    University of Skövde, School of Informatics.
    Engström, Henrik
    University of Skövde, School of Informatics. University of Skövde, Informatics Research Environment.
    Thornquist, Clemens
    Högskolan i Borås.
    Mode och spel: en förstudie för nya digitala möjligheter till hållbar utveckling2022Report (Other academic)
    Abstract [sv]

    Digitaliseringen av mode växer fram i allt större takt och under en tid där fysisk interaktion är begränsat. Under de senaste åren har flertalet samarbeten ägt rum mellan mode- och spelföretag, där digitala tvillingar av fysiska kläder skapas och implementeras i spel. Denna förstudie är finansierad av Västra Götalandsregionen och ämnar att undersöka kopplingar mellan mode och spel, dess skillnader och likheter när det kommer till konsumtion och betydelse av digitala respektive fysiska kläder, samt även undersöka samarbetsvägarna mellan dessa två områden och hur samarbeten skulle kunna se ut. Under förstudien har aktörer inom mode- och spelindustri intervjuats och en workshop har hållits för att få en djupare förståelse kring gemensamma intressepunkter och utmaningar. Resultatet har visat att det finns starka paralleller kring kläders representation för både skaparen och användaren i båda världar och att utmaningarna för samarbete dels ligger i tekniska begränsningar, företagskultur och bristande kunskap om det andra området hos respektive område. Resultatet visar också ett växande intresse och behov av hybriddesigner eller hybrida team som agerar som broar mellan dessa två områden.

  • 34.
    Larsson, Carina
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Strand, Mattias
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Persson, Anne
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Communicating continuous improvement in manufacturing companies: Divergencies between current practice and theory2017Conference paper (Refereed)
    Abstract [en]

    Succeeding with continuous improvement is important for manufacturing companies to increase the competitive edge. In order to succeed with continuous improvement, literature shows that communication of improvement indicators need to be integrated with communication of control indicators. This paper identifies divergencies between current practice and theory in the communication of CI, which can be a reason for why manufacturing companies fail in their CI implementation. An integration of control indicators and improvement indicators could improve continuous improvement results, increasing business performance.

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    Communicating CI in manufacturing companies
  • 35.
    Larsson, Carina
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Säfsten, Kristina
    Jönkoping University, Jönkoping, Sweden.
    How to visualize performance measures in a manufacturing SME2017In: Measuring Business Excellence, ISSN 1368-3047, E-ISSN 1758-8057, Vol. 21, no 4, p. 337-350Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of this paper is to identify strengths and weaknesses in the communication of performance measures and propose guidelines for the visualization of performance measures supporting continuous improvement (CI) in manufacturing small and medium-sized enterprises (SMEs). The goal is to help manufacturing SMEs improve their communication of performance measures, thereby improving performance, and strengthening the company. Design/methodology/approach - This paper draws on both theoretical and empirical research. It begins with a literature review of theoretical guidelines for the visualization of performance measures. This theoretical information is then supplemented with a case study and a survey, both carried out at the Vara plant, a manufacturing SME with well-developed communication of performance measures. The case study involved all organizational levels in the company and focused on identifying strengths and weaknesses in visual communication of performance measures supporting CI. The information acquired from the literature survey and the case study was then used as the basis for a survey of the employees in one department as regards their perception, understanding and opinion of visual communication of performance measures. The analysis of the results led to the development of guidelines and a substantive proposal improving visualization of performance measures in this specific company, and in manufacturing SMEs in general. Findings - A model for the visualization of performance measures supporting CI in the company was carried out. The guidelines proposed for all such visualizations are as follows: keep the visualization as simple as possible without compromising understanding, use symbols and colors consistently, use simple words and do not include too much information in the visualization. The study also shows that it is important to support a written visualization with an oral presentation to explain the results. Originality/value - The originality of this paper lies in its focus on the visualization of performance measures in manufacturing SMEs and the guidelines and proposals developed.

  • 36.
    Lautakoski, Johan
    University of Skövde, School of Informatics.
    Procedurell generering av terräng Perlin noise eller Diamond-Square: med fokus på exekveringstid och framkomlighet2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
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  • 37.
    Lautakoski, Johan
    University of Skövde, School of Informatics.
    Procedurell generering av terräng Perlin noise eller Diamond-Square: med fokus på exekveringstid och framkomlighet2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
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  • 38.
    Lindberg, Matilda
    University of Skövde, School of Informatics.
    Instrumentpreferenser ur ett genusperspektiv: En studie i hur kvinnor och män relaterar till instrumentgrupperna trä- och bleckblåsinstrument2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
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  • 39.
    Lindström, Elias
    University of Skövde, School of Informatics.
    Reklam i spelvärlden2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna undersökning behandlade ämnet IGA (in-game advertising). 8 undersökningsdeltagare spelade ett 2D-platformer-spel som innefattade två reklamtyper: en reklamtavla och en pop-up-reklam, som båda visade stillbildsreklam för fiktiva spel. Deltagarnas åsikter om reklamtyperna och huruvida de lade märke till endera reklamtyp mättes med hjälp av en digital enkät. Undersökningen tog stöd i tidigare forskning om IGA, gällande åsikter om reklam i spel och uppmärksamhet mot den. Bland annat LC4MP (limited-capacity model of mediated message processing) och vanliga sätt att mäta recall och recognition låg till grund för undersökningens utformning. Resultatet antyder att det är möjligt att ha en reklamtavla och pop-up-reklam i samma spel utan att någondera reklamtyp tar för mycket uppmärksamhet eller får bättre omdöme än den andra. Framtida forskning diskuterades där bland annat spelerfarenhet kan undersökas vidare i samma utformning som denna undersökning hade. Det är även möjligt för spelföretag att undersöka ämnet vidare.

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    Reklam i spelvärlden
  • 40.
    Linnéusson, Gary
    et al.
    School of Engineering, Jönköping University, Sweden.
    Andersson, Thomas
    University of Skövde, School of Business. University of Skövde, Enterprises for the Future Research Environment.
    Kjellsdotter, Anna
    Research and Development Centre, Skaraborg Hospital Skövde, Sweden.
    Holmén, Maria
    Innovation Platform, Region Västra Götaland, Gothenburg, Sweden.
    Using systems thinking to increase understanding of the innovation system of healthcare organisations2022In: Journal of Health Organization & Management, ISSN 1477-7266, E-ISSN 1758-7247, Vol. 36, no 9, p. 179-195Article in journal (Refereed)
    Abstract [en]

    Purpose – This paper applies systems thinking modelling to enhance the dynamic understanding of how to nurture an innovative culture in healthcare organisations to develop the innovation system in practice and speed up the innovative work. The model aims to provide a holistic view of a studied healthcare organisation’s innovation processes, ranging from managerial values to its manifestation in improved results.

    Design/methodology/approach – The study is based on empirical material from a healthcare unit that, within a few years, changed from having no innovations to repeatedly generating innovations. The study uses the modelling language of causal loop diagrams (CLDs) in the system dynamics methodology to identify the key important aspects found in the empirical material.

    Findings – The proposed model, based on the stories of the interviewees, explores the dynamics of inertia when nurturing an innovative culture, identifying delays attributed to the internal change processes and system relationships. These findings underscored the need for perseverance when developing an innovative culture in the entrepreneurial phases.

    Practical implications – The approach of using systems thinking to make empirical healthcare research results more tangible through the visual notations of CLDs and mental simulations is believed to support exploring complex phenomena to induce and nurture both individual and organisational learning.

    Originality/value – The results from this approach provide deepened analysis and provoke the systems view to explain how the nurturing of the culture can accelerate the innovation processes, which helps practitioners and researchers to further expand their understanding of their healthcare contexts.

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    fulltext
  • 41.
    Linnéusson, Gary
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Galar, Diego
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wickelgren, Mikael
    University of Skövde, School of Business. University of Skövde, Enterprises for the Future.
    A path forward: Systems thinking maintenance as part of shift in mind on added value2015In: / [ed] Sulo Lahdelma & Kari Palokangas, 2015Conference paper (Refereed)
    Abstract [en]

    Abstract: The purpose and novelty with this recently started research is the introduction of a modelling concept that aims to include the interdependencies maintenance have with financial figures, customer behavior, and production, using systems thinking. It suggests on a path forward in acknowledging short- and long term effects from maintenance on the production system and its financial results. Using systems thinking modelling enables learning on consequences from strategies and policies on the studied system; enabling evaluation of future scenarios supporting decision makers in defining sustainable strategies of action on the policy-level. This paper provides a brief outline of the thoughts behind the research project and points the direction for future research by first introducing aspects regarding the problem and possibilities to address, then briefly introduce different modelling approaches that in part address the problem, which is summarized into a path forward, and finally includes an example of a model by the author of a machine strategy problem that connects the physical assets and actions with financial costs.

  • 42.
    Linnéusson, Gary
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Galar, Diego
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Luleå University of Technology, Luleå, Sweden.
    Wickelgren, Mikael
    University of Skövde, School of Business. University of Skövde, Enterprises for the Future.
    In Need for Better Maintenance Cost Modelling to Support the Partnership with Manufacturing2016In: Current Trends in Reliability, Availability, Maintainability and Safety: An Industry Perspective / [ed] Uday Kumar, Alireza Ahmadi, Ajit Kumar Verma & Prabhakar Varde, Springer, 2016, 1, p. 263-282Conference paper (Other academic)
    Abstract [en]

    The problem of maintenance consequential costs has to be dealt with in manufacturing and is core of this paper. The need of sustainable partnership between manufacturing and maintenance is addressed. Stuck in a best practice thinking, applying negotiation as a method based on power statements in the service level agreement, the common best possible achievable goal is put on risk. Instead, it may enforce narrow minded sub optimized thinking even though not intended so. Unfortunately, the state of origin is not straightforward business. Present maintenance cost modelling is approached, however limits to its ability to address the dynamic complexity of production flows are acknowledged. The practical problem to deal with is units put together in production flows; in which downtime in any unit may or may not result in decreased throughput depending on its set up. In this environment accounting consequential costs is a conundrum and a way forward is suggested. One major aspect in the matter is the inevitable need of shift in mind, from perspective thinking in maintenance and manufacturing respectively towards shared perspectives, nourishing an advantageous sustainable partnership.

  • 43.
    Liu, Yu
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Urenda Moris, Matías
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Jägstam, Mats
    Jönköping University, School of Engineering, Jönköping, Sweden.
    Jenny, Everbring
    Volvo Group, Advanced Technology & Research, Gothenburg, Sweden.
    Kloo, Henrik
    Volvo Group, Advanced Technology & Research, Gothenburg, Sweden.
    Evaluating environmental impacts of production process by simulation based life cycle assessment2016In: Proceedings of the 7th Swedish Production Symposium, 2016Conference paper (Refereed)
    Abstract [en]

    Historically, the manufacturing industry is one of the main contributors to the environmental issues. With conservation of the environment becoming more and more critical for survival, it is of importance for the manufacturing industry to take responsibility for minimizing their productions’ environmental impacts. Life cycle assessment has been widely used in the product’s development phase within the manufacturing industry. However, the environmental impacts that come from various dynamic manufacturing processes are only estimated with large uncertainty. Some studies have suggested that the combination of life cycle assessment and production flow simulation is an appropriate approach to address the environmental impacts from the manufacturing processes. Nevertheless, these studies are often limiting their concerns to the limited life cycle phases or certain environmental impacts. This study proposes a framework regarding how to develop a method for evaluating and identifying improvements that help reduce the life-cycle environmental impacts of complex production processes. In addition, this work employs a simplified case study to demonstrate the proposed framework. 

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  • 44.
    Lundman, Philip
    University of Skövde, School of Informatics.
    Jämförelse av javascriptramverk vid laddning av data2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
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    Examensarbete2019
  • 45.
    Lundström, Christina
    et al.
    National Competence Centre for Advisory Services, Swedish University of Agricultural Sciences, Skara, Sweden.
    Lindblom, Jessica
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Motivations and needs for adoption of the agricultural decision support system CropSAT in advisory services2018In: International Journal of Agricultural Extension, ISSN 2311-8547, p. 71-82Article in journal (Refereed)
    Abstract [en]

    This paper presents several strategies employed by advisors in relation to the use of a Swedish agricultural decision support system (AgriDSS) called CropSAT, which is free to use and funded by the Swedish Board of Agriculture. The research questions for the study were: How is extension affected and possibly altered when provided with CropSAT? 2) How can advisory strategies in relation to PA technology use be categorised? Fourteen crop production advisors were interviewed, and the collected data were analysed thematically. The findings revealed four different extension strategies in relation to CropSAT use: 1) I do not use it, 2) I use it if I have to, 3) I use it myself and tell the farmer how to fertilise, and 4) I use it with the farmer. The obtained results indicate that the strategies selected by the advisors varied based on the requests and needs of farmers, the advisors’ personal interests and competences, CropSAT functionality, and uncertainty about how to use it in practice. When using an AgriDSS such as CropSAT in advisory situations, the complexity increases because there are more parameters to consider, and thus it could be experienced as more difficult to make proper decisions. As a result of the combination of technology and agronomy, the advisors requested more support. We argue that this request must be met by research, the authorities and the companies responsible for developing the AgriDSS. We claim that in order to increase the use of AgriDSS to optimise crop treatment at the right time and on the smallest possible scale, there is a need for a change in mind-set by among both advisors and farmers in order to increase sustainability in agriculture.

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  • 46.
    Madeleine, Thour
    University of Skövde, School of Engineering Science.
    BOTTLENECK ANALYSIS AND THROUGHPUT IMPROVEMENT THROUGH SIMULATION-BASED MULTI OBJECTIVE OPTIMIZATION2015Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Every production system has its constraints. Ever since Goldratt presented the theory of constraints in the mid 80’s a lot of effort has been made to find the best methods for constraint identification and ways to minimize the constraints in order to gain higher capacity in production. A novel method presented is Simulation-based COnstraint Removal (SCORE). The SCORE method has been proved to be more effective and detailed in the identification and sorting of the constraints when compared with other bottleneck detection methods (Pehrsson 2013). The work in this bachelor’s project has been focused on applying the method to a complex production system in order to further explore the SCORE method’s ability to identify bottlenecks and reveal opportunities to increase the throughput of a production system.

    NorthStar Battery Company (NSB) wishes to perform a bottleneck analysis and optimization in order to find improvements to increase the throughput with 10%. By using the SCORE method, improvement options with a potential to meet the goals of NSB was identified. It also facilitated for the author to further exploit the possibilities of simulation-based optimization and knowledge extraction through the SCORE method.

    By building a valid discrete event simulation model of the production line and use it for optimization, followed by a knowledge extraction, it was possible to identify the top three constraints and the level of improvement needed in the constraining operations. The identified improvements could potentially increase the throughput of the production line by 10-15 percent.

    The project was delimited to exclude the finishing part of the production line and only one battery variant has been included. Through continued work and analysis of the line using the SCORE method it will most likely be possible to even further increase the throughput of the production system and to provide NSB with more knowledge and opportunities to enhance their production effectiveness.

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    fulltext
  • 47.
    Maric, Toni
    et al.
    University of Skövde, School of Engineering Science.
    Evervall, Ida
    University of Skövde, School of Engineering Science.
    Utveckling av dörrtillbehör för att få in ljus i hall2014Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    During spring 2014, Ida Evervall and Toni Maric from the University of Skövde have carried out a project with a door making company. Daylight admission into to hallways in apartments is basically non-existent today and lamps are used to satisfy the need of light. A door accessory has been developed in order to collect light from the outside of the apartment and transport it through the door to the inside, with no transparency. The client wanted that the transport of light would mainly be done with fiber optics. Experiments showed that fiber optics were sufficient to transport the light, a collecting lens in front gave significantly better result in sunny days. Cloudy days, it was considered enough to mark the position of the door. A market research confirmed that dark hallways was a fact and that transparency-protected door accessories was highlighted together with requirements for price and other safety requirements such as fire, sound, burglary etc.

    Several solutions to the sub-functions of the door accessory were generated, combined and developed. Evaluations were carried out in the form of tests and in discussion with the client. Then one concept was elected and named BeeLight. BeeLight consists of a pentagon-shaped lens surrounded by five hexagonal lenses that focus the light into the fiber optic bundle. The collecting lens is a solution that collects light from different directions as the sun moves throughout the day. A simple test showed that BeeLight provides about 10 lumen on a sunny day. More tests should be conducted in order to obtain exact numbers on how much light BeeLight can transport into the hallway.

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    fulltext
  • 48.
    Montebelli, Alberto
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Ecological autonomy: the case of a robotic model of biological cognition2011In: Workshop on Artificial Autonomy ECAL 2011: Twenty Years of Practice of Autonomous Systems, August 8, 2011, Paris, 2011, p. 26-28Conference paper (Refereed)
  • 49. Montebelli, Alberto
    et al.
    Ruaro, Elisabetta
    Torre, Vincent
    Towards the neurocomputer2001Conference paper (Refereed)
  • 50.
    Montebelli, Alberto
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Tykal, Martin
    Aalto University, Finland.
    Intention Disambiguation: When does action reveal its underlying intention?2017Conference paper (Refereed)
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