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  • 1.
    Adamson, Göran
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. De Montfort University, UK.
    A Novel Method for Adaptive Control of Manufacturing Equipment in Cloud Environments2018Doktoravhandling, monografi (Annet vitenskapelig)
    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.

  • 2.
    Adamson, Göran
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Academy for Innovation & Research, Falmouth University, Cornwall, United Kingdom.
    Cloud Manufacturing: A Critical Review of Recent Development and Future Trends2017Inngår i: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 30, nr 4-5, s. 347-380Artikkel i tidsskrift (Fagfellevurdert)
    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.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Feature-based Function Block Control Framework for Manufacturing Equipment in Cloud Environments2018Inngår i: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 57, nr 12, s. 3954-3974Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 4.
    Ahmed, Zakarie
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Nasani, Rami
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Modellering och emulering av en människa- robot samarbetande arbetscell2019Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Kollaborativa robotar är en central utmaning vid industriell utveckling. Problemet idag är att industrirobotar inte är anpassade för ett nära samarbete med människa och säkerhetsgrindar är ett behov. Denna studie fokuserar på att utveckla en emuleringsmodell som kan demonstrera ett sådant samarbete utan behov av säkerhetsgrindar. Projektet bygger på konceptet (virtuell idrifttagning) som handlar om att använda emuleringsverktyg för att utveckla en digital tvilling som är en kopia av ett fysiskt system. Med hjälp av modellen kommer systemets funktioner och programkod testas och valideras innan en verklig implementation utförs. På uppdrag av högskolan i Skövde utfördes examensarbetet för att undersöka möjligheten om ett nära samarbete mellan en människa och industrirobot i en virtuell miljö. I studien har två olika metoder utvecklats för att undersöka möjligheten till ett samarbete men också utveckla en emuleringsmodell. Med detta har operationslistor skapats för att tydliggöra människan respektive roboten arbetsuppgifter. Sedan skapades process scenarier för att demonstrera hur ett sådant samarbete kan ske i en virtuell miljö. En fungerande emuleringsmodell där människa och robot samarbetar, levererades till högskolan i Skövde. Genom att använda emuleringsmodellen kan högskolan skapa och testa olika lösningar innan en implementation av ett verkligt system sker. Slutligen föreslås en emuleringsmetod som kan användas för att utveckla en digital tvilling.  

  • 5.
    Amenabar, Leire
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Carreras, Leire
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Augmented Reality Framework for Supporting and Monitoring Operators during Maintenance Operations in Industrial Environments2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 6.
    Andersson, Kim
    Högskolan i Skövde, Institutionen för informationsteknologi.
    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 poäng / 30 hpOppgave
    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.

  • 7.
    Andreasson, Rebecca
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Thorvald, Peter
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Distributed Cognition in Manufacturing: Collaborative Assembly Work2016Inngår i: Advances in Manufacturing Technology XXX / [ed] Yee Mey Goh, Keith Case, IOS Press, 2016, s. 243-248Konferansepaper (Fagfellevurdert)
    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.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Thorvald, Peter
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Interruptions in the wild: portraying the handling of interruptions in manufacturing from a distributed cognition lens2017Inngår i: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 19, nr 1, s. 85-108Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 9.
    Arambarri Iglesias, Oihane
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Arauzo Sanchez, Ane
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Design of a medical mask for users with Multiple Chemical Sensitivity2016Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    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.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Pehrsson, Leif
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. 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 development2018Inngår i: 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, s. 369-374Konferansepaper (Fagfellevurdert)
    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.

  • 11.
    Backlund, Per
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Maurin Söderholm, Hanna
    University of Borås, Sweden.
    Engström, Henrik
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Andersson Hagiwara, Magnus
    University of Borås, Sweden.
    Lebram, Mikael
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Breaking Out of the Bubble Putting Simulation Into Context to Increase Immersion and Performance2018Inngår i: Journal Simulation & Gaming, ISSN 1046-8781, E-ISSN 1552-826X, Vol. 49, nr 6, s. 642-660Artikkel i tidsskrift (Fagfellevurdert)
    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.
    Berg Marklund, Björn
    Högskolan i Skövde, Forskningscentrum för Informationsteknologi. Högskolan i Skövde, Institutionen för informationsteknologi.
    Out of Context: Understanding the Practicalities of Learning Games2014Inngår i: DiGRA '14 - Proceedings of the 2014 DiGRA International Conference, Snowbird, UT: DiGRA , 2014, , s. 16Konferansepaper (Fagfellevurdert)
    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. 

  • 13.
    Bergman, Camilla
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Nilsson, Anna
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Utveckling av sängarmatur för hotellmiljö: ett projekt i samarbete med LuxoSverige AB2008Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    Projektets fokus var att anpassa en armatur (från LUXO Sverige AB) till den nya LED­tekniken (Ljusemitterande dioder). Under processens gång utvecklades olika funktioner för att öka armaturens flexibilitet i placering och ljusstyrning.

    Två koncept togs fram, en väggarmatur och en bordsarmatur, båda med teleskopfunktion och flexibelt ställbar arm. Armaturen kan placeras på nattduksbordet och har Luxos stilrena drag där formen följer funktionen med dekorativa detaljer.

    Dessutom finns ovanliga funktioner i belysningssammanhang som exempelvis en USB-kontakt. Resultatet av projektet blev en sängarmatur som har goda utsikter att bli den första Svanenmärkta belysningsarmaturen i Sverige.

  • 14.
    Birtic, Martin
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    An Open Data Model for Emulation Models of Industrial Components2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 15.
    Birtic, Martin
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    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 poäng / 16 hpOppgave
    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.

  • 16.
    Bystedt, Pontus
    Högskolan i Skövde, Institutionen för kommunikation och information.
    BILLBOARDS I SPEL: En illusion av 3d-karaktärer2014Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 17.
    Eriksson, Gustav
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Meningsfull dialog: Spelarens upplevda agency i dialoger2015Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 18.
    Flores Garcia, Erik
    et al.
    Mälardalen University, Eskilstuna, Sweden.
    Ruiz Zúñiga, Enrique
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Bruch, Jessica
    Mälardalen University, Eskilstuna, Sweden.
    Urenda Moris, Matias
    Division of Industrial Engineering and Management, University of Uppsala, Uppsala, Sweden.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Simulation-based Optimization for Facility Layout Design in Conditions of High Uncertainty2018Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, s. 334-339Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 19.
    Fornlöf, Veronica
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Galar, Diego
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    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 engines2016Inngår i: 3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016: Proceedings, IEEE, 2016, s. 403-407Konferansepaper (Fagfellevurdert)
    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.

  • 20.
    Frantzén, Marcus
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    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 line2016Inngår i: Proceedings of the 7th Swedish Production Symposium, 2016Konferansepaper (Fagfellevurdert)
    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.

  • 21.
    García Martín, Rafael Adrián
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Universidad de Málaga, Escuela Técnica Superior de Ingeniería Industrial.
    Gaspar Sánchez, José Manuel
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. 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 poäng / 30 hpOppgave
    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.

  • 22.
    Gil Besi, Manuel
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Villatoro Palomar, Delia
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Design of  a CAD and Rapid Prototyping based production process for porcelain2008Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    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.

  • 23.
    Gustavsson, Patrik
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    A New Algorithm Using the Non-dominated Tree to improve Non-dominated Sorting2018Inngår i: Evolutionary Computation, ISSN 1063-6560, E-ISSN 1530-9304, Vol. 26, nr 1, s. 89-116Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 24.
    Inglot, Agnieszka
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Franzén, Oskar
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    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 poäng / 30 hpOppgave
    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.

  • 25.
    Jacobs, Stephan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Genetic algorithm for schedule optimization in the homecare industry2018Independent thesis Advanced level (degree of Master (One Year)), 15 poäng / 22,5 hpOppgave
    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.

  • 26.
    Johansson, Oscar
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Perspektiv och stress: Kameraperspektivets inverkan på puls och upplevd stress i ett endless runner-spel2015Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 27.
    Kolbeinsson, Ari
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Thorvald, Peter
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Coordinating the interruption of assembly workers in manufacturing2017Inngår i: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 58, s. 361-371Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 28.
    Larsson, Carina
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Strand, Mattias
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Persson, Anne
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Communicating continuous improvement in manufacturing companies: Divergencies between current practice and theory2017Konferansepaper (Fagfellevurdert)
    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.

  • 29.
    Larsson, Carina
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Säfsten, Kristina
    Jönkoping University, Jönkoping, Sweden.
    How to visualize performance measures in a manufacturing SME2017Inngår i: Measuring Business Excellence, ISSN 1368-3047, E-ISSN 1758-8057, Vol. 21, nr 4, s. 337-350Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 30.
    Lautakoski, Johan
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Procedurell generering av terräng Perlin noise eller Diamond-Square: med fokus på exekveringstid och framkomlighet2016Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
  • 31.
    Lautakoski, Johan
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Procedurell generering av terräng Perlin noise eller Diamond-Square: med fokus på exekveringstid och framkomlighet2016Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
  • 32.
    Lindberg, Matilda
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Instrumentpreferenser ur ett genusperspektiv: En studie i hur kvinnor och män relaterar till instrumentgrupperna trä- och bleckblåsinstrument2016Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
  • 33.
    Lindström, Elias
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Reklam i spelvärlden2019Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 34.
    Linnéusson, Gary
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Galar, Diego
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wickelgren, Mikael
    Högskolan i Skövde, Institutionen för handel och företagande. Högskolan i Skövde, Forskningsspecialiseringen Framtidens Företagande.
    A path forward: Systems thinking maintenance as part of shift in mind on added value2015Inngår i: / [ed] Sulo Lahdelma & Kari Palokangas, 2015Konferansepaper (Fagfellevurdert)
    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.

  • 35.
    Linnéusson, Gary
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Galar, Diego
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Luleå University of Technology, Luleå, Sweden.
    Wickelgren, Mikael
    Högskolan i Skövde, Institutionen för handel och företagande. Högskolan i Skövde, Forskningsspecialiseringen Framtidens Företagande.
    In Need for Better Maintenance Cost Modelling to Support the Partnership with Manufacturing2016Inngår i: Current Trends in Reliability, Availability, Maintainability and Safety: An Industry Perspective / [ed] Uday Kumar, Alireza Ahmadi, Ajit Kumar Verma & Prabhakar Varde, Springer, 2016, 1, s. 263-282Konferansepaper (Annet vitenskapelig)
    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.

  • 36.
    Liu, Yu
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    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 assessment2016Inngår i: Proceedings of the 7th Swedish Production Symposium, 2016Konferansepaper (Fagfellevurdert)
    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. 

  • 37.
    Lundman, Philip
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Jämförelse av javascriptramverk vid laddning av data2019Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
  • 38.
    Lundström, Chrstina
    et al.
    National Competence Centre for Advisory Services, Swedish University of Agricultural Sciences, Skara, Sweden.
    Lindblom, Jessica
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Motivations and needs for adoption of the agricultural decision support system CropSAT in advisory services2018Inngår i: International Journal of Agricultural Extension, ISSN 2311-8547, s. 71-82Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 39.
    Madeleine, Thour
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    BOTTLENECK ANALYSIS AND THROUGHPUT IMPROVEMENT THROUGH SIMULATION-BASED MULTI OBJECTIVE OPTIMIZATION2015Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    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.

  • 40.
    Maric, Toni
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Evervall, Ida
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Utveckling av dörrtillbehör för att få in ljus i hall2014Independent thesis Basic level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Designingenjörerna Ida Evervall och Toni Maric från Högskolan i Skövde har under våren 2014 arbetat med ett produktutvecklingsprojekt tillsammans med en dörrtillverkande uppdragsgivare. Dagsljusinsläppet till hallar i lägenheter är i princip obefintligt och lampor används för att tillgodose behovet av ljus. Ett dörrtillbehör har utvecklats i syfte att samla in ljus från utsidan av lägenheten och transportera detta genom dörren till insidan, helt insynsskyddat. Uppdragsgivaren ville att transporten av ljuset främst skulle ske med hjälp av fiberoptik. Efter experiment framkom att fiberoptiken var tillräcklig för att transportera ljuset, en insamlande lins framför gav betydligt bättre resultat soliga dagar. Molniga dagar ansågs det vara tillräckligt att markera dörrens position. Utifrån marknadsundersökningen bekräftades att mörker i hallen var ett faktum och kravet om ett insynsskyddat dörrtillbehör lyftes fram tillsammans med krav på pris och övriga säkerhetskrav som brand, ljud, inbrott etc.

    Flera lösningar till delfunktionerna för dörrtillbehöret genererades, kombinerades och utvecklades. Utvärderingar utfördes i form av tester och diskussion med uppdragsgivare. Därefter valdes ett koncept som namngavs till BeeLight. BeeLight består av en pentagonformad lins omringad av fem vinklade hexagona linser som koncentrerar ljuset in i det fiberoptiska knippet. Den insamlande linsen är en lösning som samlar in ljus från olika riktningar då solen förflyttar sig under dagen. Ett enkelt test visade att BeeLight ger ungefär 10 lumen ljus en solig dag. Fler tester bör genomföras i syfte att få fram exakta siffror på hur mycket ljus BeeLight kan tillgodose hallen med.

  • 41.
    Montebelli, Alberto
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Ecological autonomy: the case of a robotic model of biological cognition2011Konferansepaper (Fagfellevurdert)
  • 42.
    Montebelli, Alberto
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Ruaro, Elisabetta
    Torre, Vincent
    Towards the neurocomputer2001Konferansepaper (Fagfellevurdert)
  • 43.
    Montebelli, Alberto
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Tykal, Martin
    Aalto University, Finland.
    Intention Disambiguation: When does action reveal its underlying intention?2017Konferansepaper (Fagfellevurdert)
  • 44.
    Morilla Cabello, David
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Vision Based Control for Industrial Robots: Research and implementation2019Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    The automation revolution already helps in many tasks that are now performed by robots.  Increases in the complexity of problems regarding robot manipulators require new approaches or alternatives in order to solve them. This project comprises a research in different available software for implementing easy and fast visual servoing tasks controlling a robot manipulator. It focuses on out-of-the-box solutions. Then, the tools found are applied to implement a solution for controlling an arm from Universal Robots. The task is to follow a moving object on a plane with the robot manipulator. The research compares the most popular software, the state-of-the-art alternatives, especially in computer vision and also robot control. The implementation aims to be a proof of concept of a system divided by each functionality (computer vision, path generation and robot control) in order to allow software modularity and exchangeability. The results show various options for each system to take into consideration. The implementation is successfully completed, showing the efficiency of the alternatives examined. The chosen software is MATLAB and Simulink for computer vision and trajectory calculation interfacing with Robotic Operating System (ROS). ROS is used for controlling a UR3 arm using ros_control and ur_modern_driver packages.  Both the research and the implementation present a first approach for further applications and understanding over the current technologies for visual servoing tasks. These alternatives offer different easy, fast, and flexible methods to confront complex computer vision and robot control problems.

  • 45.
    Morshedzadeh, Iman
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Data Classification in Product Data Management2013Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report is about the product data classification methodology that is useable for the Volvo Cars Engine (VCE) factory's production data, and can be implemented in the Teamcenter software. There are many data generated during the life cycle of each product, and companies try to manage these data with some product data management software. Data classification is a part of data management for most effective and efficient use of data.

    With surveys that were done in this project, items affecting the data classification have been found. Data, attributes, classification method, Volvo Cars Engine factory and Teamcenter as the product data management software, are items that are affected data classification. In this report, all of these items will be explained separately.

    With the knowledge obtained about the above items, in the Volvo Cars Engine factory, the suitable hierarchical classification method is described. After defining the classification method, this method has been implemented in the software at the last part of the report to show that this method is executable.

  • 46.
    Morshedzadeh, Iman
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Extended Product lifecycle management with knowledge management: Research Proposal2016Rapport (Annet vitenskapelig)
    Abstract [en]

    Anything that is produced and offered to the markets can be a product. Each product has a lifecycle, whether the product is a car or a software program or a service. Product lifecycle has different phases from the time that it is raised as business idea at the first phase to disposal as the last stage. Product lifecycle management is a business approach for management and the use of product, process and resource related data, information and knowledge. With this management, enterprises try to use their company’s intellectual capitals. The initial PLM systems had been developed to store and manage Computer Aided Design (CAD) files and giving access to these data in different stage of the product lifecycle for users. Afterward, PLM systems, more developed to cover the management of process and resource data, and later on, managing of product related data, information and knowledge on all phases of product lifecycle. Each enterprise, according to its needs and competencies, implementing and using different capabilities of PLM systems, but still Bill of Material (BoM), Bill of Process (BoP) and Bill of resource (BoR) are forming the core of PLM systems. PLM systems try to manage data by integration with other engineering software programs to import data from them and manage those data for exporting to other software programs or makes them accessible for users. These integrations cause the managing of virtual data and information by the PLM systems, which are generated by different engineers such as designers or manufacturing engineers. CAD files and simulations are two types of virtual data. These data consist of some knowledges that had been generated by different engineers, which can be called virtual knowledge.Real World Knowledge is another type of knowledge that are exist in the enterprises. This knowledge can be captured from the happenings in the real environment such as failure reports, quality and audit reports, product performance, production data and operator’s experiences. Sometimes capturing these knowledges is very easy for example production throughput, but sometimes it is very hard, because they are unwritten and uncodified.Capturing and managing these real world knowledges, can help manufacturers to reduce their costs by making a better decisions and reusing of virtual models.Firstly these knowledges can clarify consequences and of previous decisions. They can also clarify some hidden and unconsidered issues about decision cases. The Real World Knowledge covers different types of knowledge, such as production reports, maintenance reports or operator experience.Secondly, the real world knowledge, can support to determine the level of virtual confidence (Oscarsson et al., 2015). Virtual models as one kind of virtual knowledge which had been explained before, have been designed to reduce costs by simulating the reality. The correctness and accuracy of a virtual model, clarify the level of confidence for that model and its results, for reusing that model to solve another problem. With comparing of the real world knowledge and virtual models expectations, the accuracy of the model can be evaluated, and the reliability of the model can be measured.There are lots of knowledge management systems have been developed, but most of them are trying to manage the organizational knowledge. The focus of this research is collecting the real world knowledge, in an automotive industry and converting them to the usable and classified format. Afterward, those knowledges should be stored and managed in the extended PLM platform.

  • 47.
    Morshedzadeh, Iman
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Amouzgar, Kaveh
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Management of virtual models with provenance information in the context of product lifecycle management: industrial case studies2019Inngår i: Product Lifecycle Management (Volume 4): The Case Studies / [ed] John Stark, Cham: Springer, 2019, 1, s. 153-170Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Using virtual models instead of physical models can help industries reduce the time and cost of developments, despite the time consuming process of building virtual models. Therefore, reusing previously built virtual models instead of starting from scratch can eliminate a large amount of work from users. Is having a virtual model enough to reuse it in another study or task? In most cases, not. Information about the history of that model makes it clear for the users to decide if they can reuse this model or to what extent the model is needed to be modified. A provenance management system (PMS) has been designed to manage provenance information, and it has been used with product lifecycle management system (PLM) and computer-aided technologies (CAx) to save and present historical information about a virtual model. This chapter presents a sequence-based framework of the CAx-PLM-PMS chain and two application case studies considering the implementation of this framework.

  • 48.
    Morshedzadeh, Iman
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Aslam, Tehseen
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Frantzén, Marcus
    Volvo Car Corporation, Skövde, Sweden.
    Multi-level management of discrete event simulation models in a product lifecycle management framework2018Inngår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, s. 74-81Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Discrete event simulation (DES) models imitates the behavior of a production system. Models can be developed to reflect different levels of the production system, e.g supply chain level or manufacturing line level. Product Lifecycle Management (PLM) systems have been developed in order to manage product and manufacturing related data. DES models is one kind of product lifecycle’s data which can be managed by a PLM system. This paper presents a method and its implementation for management of interacting multi-level models utilizing a PLM system.

  • 49.
    Morshedzadeh, Iman
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Jeusfeld, Manfred A.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Sillanpaa, Janne
    InterSystems Sweden AB, Stockholm.
    Product lifecycle management with provenance management and virtual models: an industrial use-case study2018Inngår i: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 72, s. 6s. 1190-1195Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Saving and managing virtual models’ provenance information (models’ history) can increase the level of reusability of those models. This paper describes a provenance management system (PMS) that has been developed based on an industrial case study.

    The product lifecycle management (PLM) system, as a main data management system, is responsible for receiving virtual models and their related data from Computer-Aided technologies (CAx) and providing this information for the PMS. In this paper, the management of discrete event simulation data with the PLM system will be demonstrated as the first link of provenance data management chain (CAx-PLM-PMS).

  • 50.
    Morshedzadeh, Iman
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H.C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Jeusfeld, Manfred A.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Jenefeldt, Anders
    Volvo Cars Corporation, Skövde, Sweden.
    Real World Data Identification and Classification for Support of Virtual Confidence2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Shortening of the product development process time is one of the main approaches for all enterprises to offer their products to the market. Virtual manufacturing tools can help companies to reduce their time to market, by reduction of the engineering lead time. Extensive use of virtual engineering models results in a need for verification of the model’s accuracy. This virtual engineering usability and assessment have been named virtual confidence. The two main factors of the achievement of this confidence are the accuracy of the virtual models and the virtual engineering results.

    For controlling of both above factors, a complete virtual model and related virtual model knowledge are needed. These knowledges can be tacit or explicit. For exploring explicit knowledge, a data and information collection from different disciplines in the organization is needed.

    In this paper, a data map with focus on the manufacturing engineering scope will be presented. This data map is generated from different data sources at a manufacturing plant, and gives an overview of different data that exist at different data sources, in the area of manufacturing. Combining real world data from different sources with virtual engineering model data supports, amongst others, establishment of virtual confidence.

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