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  • 301.
    Bältsjö, Ivar
    University of Skövde, School of Humanities and Informatics.
    Interaktiv manual för en fysisk produkt: Hur interaktivitet påverkar instruktioner för skapandet av en fysisk produkt.2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Denna undersökning syftar till att undersöka huruvida interaktivitet kan göra instruktioner för en fysisk uppgift mer effektiva. För att göra detta skapades två applikationer som instruerade i vikningen av en origamifigur i form av en båt. En version implementerade interaktiva element medan den andra inte gjorde det. Testpersoner fick genomföra halva uppgiften med vardera applikationen och sedan fylla i en enkät. Inga definitiva svar hittades i undersökningen, men den skulle kunna användas som grund eller inspiration för vidare forskning.

  • 302.
    Calestam, Magnus
    et al.
    University of Skövde, School of Technology and Society.
    Wedin, Johan
    University of Skövde, School of Technology and Society.
    Bucklingsanalys av spannmålssilo2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Grains with varying humidity can be stored in square silos with wall elements consisting of corrugated sheet. When the stored grain is to be emptied from the silos it has tendency to stick to the walls, especially if humid, which means that the grain must be removed manually. To avoid this time-consuming process a flat sheet is mounted on the corrugated sheet to prevent the moist grain from sticking to the wall. If the same dimension on the corrugated sheet is used when the flat sheet is or is not mounted the walls may be subjected to buckling. This thesis is thus about how the wall elements shall be designed in order to prevent buckling. The silos that have been examined have a cross section of 3.0 x 3.0 m and 2.5 x 2.5 m respectively with wall elements consisting of only corrugated sheet or smooth sheet mounted on corrugated sheet. Furthermore, the silos got vertical walls with a height of 8.4 m consisting of ten sections. Calculations are made with wheat as the stored grain.

     

    To be able to dimension the wall elements the pressure is calculated for the different silos, using the Swedish and European standard Eurocode (2006), EN 1991-4 for pressure calculations in silos and tanks. To calculate the pressure the silos are assigned into action assessment class 1, since their capacity are less than a 100 tons, which further means that the unsymmetrical pressure can be ignored. The silos are also classified as slender. As the silos outlet consists of a square pyramidal hopper with centric outlet and a half internal angel of 45° an inner pipe flow occurs during emptying. This means according to Eurocode that the dimension shall be based on the pressure which occurs during filling. The horizontal and vertical pressure and the pressure made from the friction are calculated for the different cross sections.

     

    The CAD software Pro Engineer and the finite element extension Mechanica is used to model the current silos and perform analysis for stress and buckling. The models have four symmetry planes therefore only one eighth of the current structure is modeled, corresponding to half a wall element and half a pole. The models are created as shell models and boundary conditions are applied in all symmetrical planes and on the top and bottom of the pole. The structure of the silos is simplified since no screws or radius is modeled. The pressure calculated according to Eurocode is converted into forces and applied to the models. The whole structure is modeled in steel with yield strength of 180 MPa.

     

    The company’s older dimension standards are applied on the wall elements and analyzed. To investigate where to most critical areas for buckling occurs a buckling analysis based on a static analysis of the models is performed. The results from the buckling analysis for the silo wall element consisting of corrugated sheet with the width of 3.0 m shows that buckling occurs on the second bottom section at 72 % of the applied force. For the silo consisting of the same wall element but with the width of 2.5 m buckling occurs at the top section where the buckling force amounts to 62 % of the applied force. For the silos with wall elements consisting of plain sheet mounted on corrugated sheet buckling occurs at 3-4 % of the applied force for the two wall widths. Analysis show that the low values of buckling load on the plane sheet is a result from local buckling. In order to dimension the corrugated sheet to prevent it from buckling when the plane sheet is mounted a free body diagram is made for the corrugated sheet to obtain the acting forces. The buckling analysis of the corrugated sheet, with wall width 3.0 m, which is pressurized by the plane sheet shows that buckling occurs on the silos second bottom section. Buckling occurs at 59 % of the applied force for the silo with wall width of 2.5 m buckling occurs at 51 % of the applied force on the silo top section.

     

    Since the goal is that the corrugated sheets are not to be subject to buckling, the thickness of the sheets is iterated until the buckling force is equal to at least 110 % of the applied force. This generates an increased thickness for the lower four sections for the silo with wall element consisting of corrugated sheet with wall width of 3.0 m. For the silo with the same wall elements but with a wall width of 2.5 m, the dimensions of the top two sections need to increase. Regarding the silos with wall elements consisting of plane sheet mounted on corrugated sheet an increase in dimension is needed for the corrugated sheet for the five lowest sections for the wall width of 3.0 m.

     

    With a wall width of 2.5 m the same dimension can be used as when the silo wall elements consist of only corrugated sheet. If the plane sheet is not to be exposed for buckling the thickness of the sheets needs to be increased from between 5.5 mm and 1.5 mm. All calculations of the sheet dimensions are obtained by a conservative thinking which means that the company’s older dimensions may be correct. However, the resulting dimensions are reasonable for the corrugated sheets.

     

  • 303.
    Camacho Moreno, Dionisio
    et al.
    University of Skövde, School of Engineering Science.
    Giner Pérez, Jorge
    University of Skövde, School of Engineering Science.
    Mechanical Design of a Compliant Horseshoe2014Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The principal aim of this research is the design of a more compliant horseshoe which allows the natural expansion and compression of the horse hoof. Three different simulations have been carried out in by using Finite Element Method in order to know the behaviour of the horse hoof when is analysed under the same load conditions. First the hoof will be studied without any horseshoe to obtain the produced displacement by the hoof expansion. Once the displacement of the barefoot hoof is known, an assembly, in which a sample stiff horseshoe is attached to the hoof by nails, will be performed to obtain both the hoof displacement as the horseshoe one. Finally, after three different researches about the current horseshoes, different possible alternative materials and most commons attachment methods, a more flexible horseshoe will be created and analysed. The results obtained in the three simulations will be compared and commented. 

  • 304.
    Campillo, Jose
    et al.
    University of Skövde, School of Engineering Science.
    Garcia, Celia
    University of Skövde, School of Engineering Science.
    Creating a pleasurable aluminium packaging2015Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This project has been carried out in collaboration with CC Pack, a Swedish packaging company located in Tibro, and under the supervision of University of Skövde.

    The aim of the project is the creation of a new aluminium packaging, with the intention of satisfying the highest number of customers' requirements, getting also a differentiation from the competitors.

    Archer’s model is followed during the design process. This model allows strengthening the efficiency of project design.

    The compilation of information in order to make a complete requirement classification is based on: CC Pack requirements, a study of customer needs focused on interviews and pilot study, and a literature study lead by Maslow’s hierarchy translated to design along with the 4 pleasures of Patrick Jordan.

    After the requirements classification, it is time to start with the concept generation phase. This phase consist of diverse methods of generation and evaluation of ideas, such as brainstorming or the weighted objective method, until a final solution is reached.

    This last solution, which consists of an aluminium tray surrounded by a cardboard structure, is communicated at the end of the project through illustrations created through design software such as PTC Creo Parametric and Photoshop.

    Conclusions obtained are quite positive in general, nevertheless there is still an aspect that could be improved. It is related to the shipping system and it is commented in chapter 7 conclusions.

    There is also a chapter devoted to propose possible future contributions in order to implement this project.

  • 305.
    Cana Quijada, Juan
    et al.
    University of Skövde, School of Technology and Society.
    Gil Camacho, Carlos
    University of Skövde, School of Technology and Society.
    3D Model Driven Distant Assembly2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Today, almost all factories use robots to a certain extent. In particular, automated assembly operations are common in modern manufacturing firms. However, current industrial applications require a pre-knowledge of assembly parts, their locations as well as the paths that they should follow during the assembly process.

    This research introduces a remote assembly control system, which gives the operator access to the robot at any time and any location as long as there is an Internet access. In addition, the remote assembly control uses a user-friendly interface which is easy and quick to use. An operator does not need great knowledge before using the web portal for the remote assembly control. On the contrary, using robot programming software would require the operator spending more time to learn specific skills. The remote assembly is also useful in risky situations in which the operator must keep a distance from the work place of the robot.

    The main objective of this project is to design a web-based system that can provide the ability for remote operators to assemble objects in a robotic cell using 3D models of those objects in a virtual environment. The system consists of an industrial robot and a network camera connected to an application server. Using the user interface and the camera, a remote operator can take some snapshots of the real objects in the robotic cell and the system will construct the 3D models of these objects. Consequently, the operator can assemble the real objects using the equivalent 3D models via an existing Wise-ShopFloor virtual environment.

    The scope of the project includes:

    • Capturing the real objects with a camera mounted beside the gripper of the robot. The position of the camera gives the system more flexibility for taking the snapshots from different angles.
    • Analysing the snapshots using different filters in order to identify the silhouettes of the objects. These silhouettes will be labelled to help distinguishing the different objects.
    • Constructing 3D models of the objects. This will be done by constructing pillars from the labelled silhouettes of the top view of the objects. These pillars will be trimmed with the silhouettes obtained from snapshots in different angles, until the pillars represent the objects with the needed accuracy.
    • Integrating the models into the Wise-ShopFloor virtual environment. This environment can be executed in a web browser.
    • Updating the objects in the virtual environment according to the assembly operations.

    Since assembly only needs picking and placing objects, the image processing and the 3D modelling do not need as high quality as it would need for other tasks, such as welding. In addition, the operator may be anywhere as long as an Internet access is provided. The Internet connection does not need to be in broadband because the system consumes a limited bandwidth for receiving snapshots from the camera and sending assembly instructions to the robot.

    The results of this project will allow the operator to work away from dangerous environments, therefore helping to improve safety. This research can also help improving the adaptability of industry in ad-hoc assembly operations. Besides, the use of the web for the remote assembly can save cost and time in operator training and special-purpose software purchasing. Remote assembly is expected to become an important research area with unlimited application potentials in the future in distributed manufacturing.

  • 306.
    Cardell, Gabriel
    University of Skövde, School of Informatics.
    Teoretiska designmönsters effekt i praktiken2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete har utgått från att besvara frågeställningen ‘Hur väl fungerar teoretiska designmönster för navigering i praktiken?’ Designmönster i det här fallet innebär användandet av diverse mönster i en spelnivå som bland annat kan användas för att vägleda en spelare. Designmönstren baserades på diverse undersökningar om hur diverse spel vägleder den som spelar. Dessa designmönster sammanfattas sedan i en rad olika kategorier. Designmönstren har sedan inkorporerats i en spelbar prototyp i formen av ett hacka-och-slå-spel som spelas i fågelperspektiv. Prototypen användes sedan i en undersökning där frivilliga testdeltagare fick spela igenom det samtidigt som de blev observerade och ombads tänka högt. Därefter blev deltagarna intervjuade i en kvalitativ intervju där de fick uttrycka sina tankar angående olika områden där designmönstren användes. Resultaten visade att designmönstren fungerade till viss del men inte alltid på det sättet som var tänkt. Enligt teorin var det meningen att deltagarna skulle följa vägarna där designmönstren användes men ganska ofta valde deltagarna medvetet att gå den vägen sist eftersom de ville utforska allting annat innan de slutligen gick den vägen de tänkte var den rätta. Designmönstren delades då in i två kategorier. Den ena, som fick namnet undermedvetna vägledare, är designmönster som vägleder spelare utan att de är speciellt medvetna om att de blir vägledda. Den andra, som fick namnet antydare, är designmönster som tydligt markeras och märks av spelaren så att personen sedan själv kan avgöra ifall de vill följa den vägen eller inte. Detta gjorde det svårt att dra några slutsatser i och med att det till en början antogs att alla designmönstren tillhörde kategorin undermedvetna vägledare. Utöver det klargjordes det aldrig vad det innebär hur ett designmönster fungerar när det “fungerar väl”.

  • 307.
    Carlander, Simon
    University of Skövde, School of Informatics.
    Rörelsegestalter: Förenklingsmodell för rörelse & form2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Studien undersökte hur effektivt minimalistiska rörelse och formrepresentationer kan användas för att framkalla illusionen av levande och igenkännbara sammanhang. Kopplingen baseras på ett antal kognitivpsykologiska studier och teorier av Arnheim, Forti, Rorsach och Braisby & Gellatly. Bakgrunden till studien är baserad på att spelvärldar oftast upplevs obebodda, då det skulle ta mycket resurser från spelet att rendera fulla gator och folkmassor. För att testa problemformuleringen skapades 8 filmklipp uppdelade i 4 scener med två versioner var. En mer detaljerad med fulla modeller och detaljerade objekt och en odetaljerad där endast huvudsakliga former visade samma rörelser. För att testa dessa filmklipp designades en semistrukturerad intervju som användes för att intervjua 10 deltagare. Svaren deltagarna gav var vad studiens teorier förutspådde och det klargjordes att rörelserepresentationerna var  effektiva i att framkalla de större sammanhangen av scenerna. Studien saknar dock tillräckligt med deltagare för att vara vetenskapligt sund och kan utvecklas med uppföljningsstudier.

  • 308.
    Carlberger, Thomas
    University of Skövde, School of Technology and Society.
    Adhesive joining for crashworthiness: material data and explicit FE-methods2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Today, crash simulations replace crash testing in the product development phase in theautomotive industry. High quality simulations enable shorter product development time andhigher competitiveness. However, increasing requirements regarding emissions andcrashworthiness are demanding optimised material choice in the parts constituting the carbody structure. Lightweight materials are becoming frequently used. Joining dissimilarmaterials is difficult using common joining techniques like spot welding. To this end,adhesive joining is currently gaining popularity not only due to the ability to join dissimilarmaterials, joint integrity and structural stiffness both increase by the use of adhesive joining.Moreover, the number of spot welds may be reduced in hybrid joints.In this thesis, adhesive joints are studied with respect to crashworthiness of automotivestructures. The main task for the adhesive is not to dissipate the impact energy, but to keep thejoint integrity so that the impact energy can be consumed by plastic work of the basematerials. Fracture of adhesives can be accurately modelled by cohesive zones. The dynamicbehaviour of finite element structures containing cohesive zones is studied using a simplifiedstructure. An amplified strain rate is found in the adhesive as compared to the base material.The cohesive zone concept is used in the development of a 2D interphase element. Theaccuracy and time step influence of the interphase element is compared to solutions based oncontinuum element representation of the adhesive. The interphase element is found to predictfracture of the adhesive joint with engineering accuracy and has a small effect on the timestep of the explicit FE method.The cohesive laws for use in the material models of the adhesive have been determined usingdedicated test methods. The double cantilever beam specimen and the end notched flexurespecimen are used with inverse methods to determine cohesive laws in peel and shear,respectively. The cohesive laws are determined for varying temperature, strain rate andadhesive layer thickness. A built up bimaterial beam is designed for testing and simulation ofjoints consisting of bolts, adhesives and combinations of bolts and adhesives, i.e. hybridjoints. The model of the hybrid beam developed was found to be able to predict results fromimpact tests, quantified as maximum load and deformed shape of the beam.

  • 309.
    Carlberger, Thomas
    University of Skövde, School of Technology and Society.
    Impact Simulation of Adhesively Joined Structures2006Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The development of competitive and crashworthy automotive car bodies has reached so far that the manufacturers no longer rely on mono-material steel structures. Improved strength/weight performance may be achieved by using optimal material in each part of the car structure, leading to bi-material joints and ruling out spot welding; the common joining method during the past half century of automotive history. Adhesive bonding is an attractive joining method, not only capable of managing dissimilar materials, but also capable of improving stiffness and strength in monomaterial structures. Moreover, the joints do not need additional sealing and there may be cost savings using adhesive bonding. Impact simulation of car structures is mostly performed using an explicit FE-method. This method has an inherent stability criterion: the time step used may not exceed the stable time step, or critical time step, Δtc. In this thesis, a simplified cohesive zone model is studied. It is implemented into an explicit FE-code and compared to a closed form solution. The FE-solutions agree with the closed form solutions. It is found that the evolution of damage in the adhesive layer may stop under certain conditions that are likely to occur in a real structure. It is shown that an explicit FE-analysis with a “large” time step is more prone to give immediate rupture. Thus, the method is conservative. An interphase element formulation is derived for a 2D-adhesive joint model, joining beam adherends. It is shown that the mass matrix of the interphase element gives a small contribution to the mass matrix of the structure. However, this contribution is positive for the numerical stability of the explicit FE-method and it is recommended to keep this matrix in the analysis. Moreover, it is concluded that the contribution of material damping of the adhesive layer can be neglected as compared to the effects of plasticity of the adherends. The interphase element formulation is used to analyse the Double Cantilever Beam specimen. The results are compared to an alternative model using continuum elements. The comparison shows substantially faster convergence and shorter execution time for the interphase formulation. A rough estimate indicates fifteen times shorter execution time using the interphase elements in a realistic structure.

  • 310.
    Carlberger, Thomas
    et al.
    University of Skövde, School of Technology and Society.
    Biel, Anders
    University of Skövde, School of Technology and Society.
    Influence of temperature and strain rate on cohesive properties of a structural epoxy adhesiveManuscript (Other academic)
  • 311.
    Carlberger, Thomas
    et al.
    SAAB Automobile AB, Trollhättan, Sweden.
    Biel, Anders
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Stigh, Ulf
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Influence of temperature and strain rate on cohesive properties of a structural epoxy adhesive2009In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 155, no 2, p. 155-166Article in journal (Refereed)
    Abstract [en]

    Effects of temperature and strain rate on the cohesive relation for an engineering epoxy adhesive are studied experimentally. Two parameters of the cohesive laws are given special attention: the fracture energy and the peak stress. Temperature experiments are performed in peel mode using the double cantilever beam specimen. The temperature varies from −40 to + 80°C. The temperature experiments show monotonically decreasing peak stress with increasing temperature from about 50 MPa at −40°C to about 10 MPa at + 80°C. The fracture energy is shown to be relatively insensitive to the variation in temperature. Strain rate experiments are performed in peel mode using the double cantilever beam specimen and in shear mode, using the end notch flexure specimen. The strain rates vary; for peel loading from about 10−4 to 10 s−1 and for shear loading from 10−3 to 1 s−1. In the peel mode, the fracture energy increases slightly with increasing strain rate; in shear mode, the fracture energy decreases. The peak stresses in the peel and shear mode both increase with increasing strain rate. In peel mode, only minor effects of plasticity are expected while in shear mode, the adhesive experiences large dissipation through plasticity. Rate dependent plasticity, may explain the differences in influence of strain rate on fracture energy between the peel mode and the shear mode.

  • 312.
    Carlberger, Thomas
    et al.
    SAAB Automobile, S-46180 Trollhättan, Sweden.
    Stigh, Ulf
    University of Skövde, School of Technology and Society.
    An explicit FE-model of impact fracture in an adhesive joint2007In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 74, no 14, p. 2247-2262Article in journal (Refereed)
    Abstract [en]

    Dynamic fracture of an adhesive layer in a structure is analysed. The structure represents some specific properties of an automotive structure and is simple enough to allow for closed form solutions obtained by the method of characteristics. These solutions are compared to results of explicit FE-analyses. The FE-solutions agree with the closed form solutions. Damage is included in the FE-model. Three constitutive models of the adhesive layer are used. It is shown that an amplification of the strain rate is achieved in the adhesive layer. It is also shown that an artificially increased flexibility of the adhesive in an aluminium structure gives only minor influences of the general behaviour. In some load cases, the adhesive layer will experience repeated loading/unloading. It is shown that in these cases an explicit FE-analysis with a “large” time step is more prone to give immediate rupture. Thus, the method is conservative.

  • 313.
    Carlberger, Thomas
    et al.
    SAAB Automobile AB.
    Stigh, Ulf
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Dynamic testing and simulation of hybrid joined bi-material beam2010In: Thin-walled structures, ISSN 0263-8231, E-ISSN 1879-3223, Vol. 48, no 8, p. 609-619Article in journal (Refereed)
    Abstract [en]

    A specimen is developed for real-like low velocity impact testing of bi-material joint configurations. Six different joint configurations are analysed. Two engineering adhesives are evaluated with and without discrete mechanical fasteners, i.e. adhesive and hybrid joints. Experiments and simulations are performed. The simulations are performed using adhesive cohesive finite elements. Simulations show good agreement with experiments in impact energy and overall deformation mode. The histories of applied load vs. load-point deflection show reasonably good correlation. The results show that the impact energy consumption depends on the joint integrity. A threshold value for the fracture energy of the adhesive seems to exist. Beneath this value, adhesive and discrete fastener work together increasing the impact energy capacity. Above this value the discrete fastener has a negative effect, and may be regarded as a stress concentration.

  • 314.
    Carlberger, Thomas
    et al.
    SAAB Automobile AB.
    Stigh, Ulf
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Influence of Layer Thickness on Cohesive Properties of an Epoxy-Based Adhesive: An Experimental Study2010In: The journal of adhesion, ISSN 0021-8464, E-ISSN 1563-518X, Vol. 86, no 8, p. 814-833Article in journal (Refereed)
    Abstract [en]

    Cohesive laws are determined for different layer thicknesses of an engineering adhesive. The shape of the cohesive law depends on the adhesive layer thickness. Of  the  two  parameters  of  the  cohesive  law—the  fracture  energy  and  thestrength—the fracture energy is more sensitive to thickness variation than the strength. The fracture energy in peel mode (Mode I) increases monotonically as the thickness is increased from 0.1 to about 1.0 mm. At an adhesive thickness of 1.5 mm, the fracture energy is slightly lower than for a 1.0 mm adhesive thickness, indicating a maximum between 1.0 and 1.5 mm. In shear mode (Mode II), the thickness dependence is not as strong, but an increasing trend in fracture energy with increasing adhesive thickness is evident. A slight decrease in strength with increasing adhesive thickness is found in both loading modes.

  • 315.
    Carlberger, Thomas
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Vilka hållfasthetsegenskaper har limfogen?: Simulering på Högskolan i Skövde ger svaren2014In: Fordonskomponenten, ISSN 2000-7299, no 3, p. 46-47Article, review/survey (Other (popular science, discussion, etc.))
    Abstract [sv]

    Att beräkna limfogars hållfasthet är inte helt enkelt, vilket beror på spänningskoncentrationens inflytande vid limfogens kanter.

    Materialmekanik vid Högskolan i Skövde har specialiserat sig på hållfasthetssimulering av limfogar genom kohesiv modellering.

  • 316.
    Carlson, Robin
    University of Skövde, School of Humanities and Informatics.
    Navigering i virtuella ljudvärldar2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Ljudbaserade spel är ett relativt outforskat område inom dataspel men är samtidigt en typ avspel med stor potential. I rapporten granskas tidigare forskning kring ljudbaserade spel utangrafik och hur vi uppfattar ljud i vår omgivning med både fokus på underhållning ochutbildning. Fokus läggs också på att undersöka synskadade som målgrupp för den här typenav spel. Under arbetet skapas en prototyp av ett ljudbaserat spel där syftet är att undersökaolika navigeringsmetoder för ljudbaserad navigering. Ett antal deltagare får sedan spelaspelet och resultaten sammanställs för att få en bild av hur deltagarna klarade att lösauppgifterna som spelet är konstruerat med och även hur spelaren upplevdespelgenomgången. En analys av resultatet presenteras sen och jämförs med de teorier sompresenterats tidigare. Sist presenteras förslag på hur fortsatt forskning inom området kan seut och vilka områden som kan dra nytta av ljudbaserade spel utan grafik.

  • 317.
    Carlsson, Andreas
    et al.
    University of Skövde, School of Technology and Society.
    Ronnheim, Marcus
    University of Skövde, School of Technology and Society.
    Utveckling av viktskivor, viktlås och viktställ för professionell gymverksamhet2008Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport behandlar ett examensarbete inom integrerad produktutveckling som utfördes av Andreas Carlsson och Marcus Ronnheim vid Designingenjörsprogrammet på Högskolan i Skövde vårterminen 2008. Examensarbetet var att utveckla Casall Sports Products viktskivor, viktlås samt viktställ för bodypumpviktskivor. Bakgrunden till uppdraget var att Casall tyckte att deras, redan nämnda produkter, var föråldrade och behövde ett nytt utseende samt att viktstället saknade vissa fördelaktiga funktioner. Rapporten beskriver hela produktutvecklingsfasen från förstudie till produktionsritningar.

    Under förstudien gjordes bl.a. en marknadsundersökning och användarintervjuer, detta resulterade i en kravspecifikation. Idégenereringsfasen resulterade i flera s.k. mood boards som ett flertal idéer kring viktskivor och viktställ togs fram utifrån. Konceptutvecklingen handlade mycket om att bestämma en exakt storlek för produkterna och att bestämma material samt att göra CAD-modeller och ritningar.

    Resultatet blev att internationella viktskivor, pumpviktskivor samt viktställ gjordes helt färdiga. Skolvikter och viktlås stannade vid koncept, dock togs ändå ritningar togs fram för viktlåset.

  • 318.
    Carlsson, Annika
    University of Skövde, School of Engineering Science.
    Kapacitetsanalys av produktionsflöde: - Med hjälp av produktionssimulering och traditionella produktionstekniska verktyg2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Volvo GTO in Skövde belongs to manufacturing and supply engines for truck customers worldwide. All engines to be sent for export goes through a production flow, CBU-line. CBU-line is an assembly line that not since construction in 1996 has undergone any major layout changes of substance, although the details of the flow changed. The object of the project is that by analyzing access conditions in order to determine the flow capacity and to produce focus areas for future improvement efforts.

    The flow lacks a large amount of the production engineering data necessary to assess its capabilities. Based on this a number of methods have been used together to create a picture of the current state of flow. Methods such as time study, work-study and AviX study have been conducted to identify bottlenecks in flow. While it is clear how much work is categorized in value-added in whole flow and per station. In addition to these traditional production engineering tools, there have been a production simulation. Implemented analyzes consistently shows a common bottleneck in the production flow which becomes the focus of improvement efforts.

    Through simulation analysis, the flow technical capacity estimated to be approximately 40 % higher than the throughput that occurs in the flow today. Simulation Analysis based on one developed suggestion for improvement indicates a potential increase of 32 %. To create the conditions to achieve this requires systematic efforts to reduce the effect of interference and wastage in the flow comprising over 70 % of all activity in the flow. The work has proposed that with relatively simple means to reduce bottleneck and increase throughput through the flow.

  • 319.
    Carlsson, Henric
    University of Skövde, School of Informatics.
    Using A Recommender To Influence Consumer Usage2013Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    In this dissertation, the issues of the increased awareness of energy use are considered. Energy technologies are continuously improved by energy retailers and academic researchers. The Smart Grid are soon customary as part of the energy domain. But in order to improve energy efficiency the change must come from the consumers. Consumers should be active decision makers in the Smart Grid domain and therefor a Recommender system suits the Smart Grid and enables customers. Customers will not use energy in the way energy retailers, and politicians advocates instead they will do what fits them. By investigating how a Recommender can be built in the Smart Grid we focus on parameters and information that supports the costumers and enables positive change. An investigation of what customers perceive as relevant is pursued as well as how relevancy can adjust the system. A conceptual model of how to build a Recommender is rendered through a literature review, a group interview and a questionnaire.

  • 320.
    Carlsson, Klara
    University of Skövde, School of Informatics.
    WALKING CRAZY?: En beteende- och rörelsestudie om stereotypa labila skurkar.2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Arbetet fokuserar på stereotyper om labila skurkar och deras rörelsemönster. Studien tittar på animationens historia från Disneys tid och framåt samt skurkens narrativa syfte, för att undersöka hur stereotypen används och varför.  Studien utforskade huruvida en animerad figur uppfattades som skurk baserat på sitt rörelsemönster. För att göra detta skapades två animationer vilka båda baserades på analyserade skurkkaraktärer från spel. En animation var överdriven och den andra kontrollerad.  En kvantitativ studie med semi-strukturerad intervju och en kompletterande enkät genomfördes på 10 deltagare, vilka delades upp i två grupper baserat på vilken Animation de fick se först.  Resultaten varierade beroende på vilken animation som visades först. Framtida arbeten kan genomföra studien på en 3D-modell för att få ett mer avläsbart resultat. Undersökningen utfördes på spelare men kan med fördel utföras på spelutvecklare för att väcka uppmärksamhet för stereotypens potentiella skadlighet.

  • 321.
    Carlsson, Linnéa
    University of Skövde, School of Technology and Society.
    Design av lättöppnad färdigmatsförpackning: Inriktning hållbar utveckling2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    A development of an environmentally friendly, ready meals packaging, that is easy to open for people suffering from rheumatoid arthritis, has been performed in cooperation with CC Pack in Tibro. The package is intended for use in elderly care home services. The development work was mainly done by focus group surveys and tests of function models. A life cycle analysis with reference in the current plastic trays used in home care in Skövde was conducted to find out which of the two final concepts was the most eco-friendly. Evident in interviews and site visits was that a rounder and more colorful packaging was desired. A simple oval tray with a hard cardboard flap solved the problem of opening difficulties, both by the position of the hard flap and also with an elongated shape.

  • 322.
    Carrera Artola, Iosu
    et al.
    University of Skövde, School of Engineering Science. Mondragon Unibertsitatea.
    Lucena Garcerán, Alejandro
    University of Skövde, School of Engineering Science. University of Málaga .
    Detection of Frazil Ice at Water Intakes at Träbena Power Station2014Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Frazil ice is a phenomenon that takes place in cold regions when the water of rivers, lakes or oceans is cooled under 0ºC. Several times during winter, frazil ice can appear at river Ätran, where Träbena hydropower plant is held by the company Wetterstad Consulting AB. Frazil ice particles contained in the flowing water are extremely sticky and adhere to any object placed in the water. Trash racks are used by the power plant at the water intakes to prevent any strange object to go into the turbines. However, frazil ice particles stick to the trash racks creating an ice blockage that interrupts the water inflow. In this situation, the power plant has to stop the production even for several months, due to the lack of water that reaches the turbines. In order to solve this problem, the company has installed a heating system on the trash racks that prevent the adhesion of frazil ice particles. This system is manually operated, and it is turned on or off based on the experience and predictions of the company. This heating system is very power consuming and every time it is turned on unnecessarily the company loses money. An automatic frazil ice detection system that turns on the heating system when needed is to be created. For that, several options have been analysed, and finally a capacitor-based sensor has been developed as a solution. The sensor consist of two steel plates coated with semi-transparent polycarbonate submerged underwater parallel placed in the space between the trash racks’ bars, forming this way a parallel plate capacitor. The capacitance of a capacitor depends exclusively on its geometry and the dielectric material between the plates. Hence when the water temperature is low enough, frazil ice particles stick to the plates of the capacitor and its capacitance will vary indicating that the accretion of frazil ice may block the water inflow. This variation is registered and a signal is send to the heating system to start operating. This way, the heating system is completely automated; no human intervention is needed at all.

  • 323.
    Casas-Roma, Jordi
    et al.
    Faculty of Computer Science, Multimedia and Telecommunications, Internet Interdisciplinary Institute (IN3), Universitat Oberta de Catalunya, Barcelona, Spain.
    Herrera-Joancomartí, Jordi
    Department of Information and Communications Engineering, Universitat Autònoma de Barcelona, Bellaterra, Spain.
    Torra, Vicenç
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    A survey of graph-modification techniques for privacy-preserving on networks2017In: Artificial Intelligence Review, ISSN 0269-2821, E-ISSN 1573-7462, Vol. 47, no 3, p. 341-366Article in journal (Refereed)
    Abstract [en]

    Recently, a huge amount of social networks have been made publicly available. In parallel, several definitions and methods have been proposed to protect users’ privacy when publicly releasing these data. Some of them were picked out from relational dataset anonymization techniques, which are riper than network anonymization techniques. In this paper we summarize privacy-preserving techniques, focusing on graph-modification methods which alter graph’s structure and release the entire anonymous network. These methods allow researchers and third-parties to apply all graph-mining processes on anonymous data, from local to global knowledge extraction.

  • 324.
    Case, Keith
    et al.
    Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Thorvald, Peter
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Editorial2019In: Production & Manufacturing Research, ISSN 2169-3277, Vol. 7, no 1, p. 529-530Article in journal (Other academic)
  • 325.
    Castagnino Ugolotti, Vania
    University of Skövde, School of Informatics.
    Persuasive Meaningful Play: Exploring the video game Behind Every Great One2019Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This thesis shines a light on tools that can be used in order to create persuasive and meaningful video games. This research was designed as an exploration of the game Behind Every Great One, with the purpose to determine if and how the game could attain a persuasive and meaningful representation of a benevolent sexist situation.

    To achieve this, the research took on three different approaches: an interview with the developer, a textual analysis of the game, and a qualitative survey analysing players' reactions to, and perceptions of, the game.

    The findings suggest that displaying characters' emotions in ways that transmit them to the players, paired with a realistic, complex representation of the social situation portrayed, are imperative for making the game have a persuasive and meaningful impact on the players. The researcher also suggests the term persuasive meaningful play as an applicable way to refer to games that contain similar characteristics as Behind Every Great One.

  • 326.
    Cedenkvist, Kristin
    University of Skövde, School of Engineering Science.
    Utveckling av ett nytt ändbeslag för spinnakerbom2016Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this project a product development has been made of a spinnaker pole end fitting. The project has been made in cooperation with Seldén Mast AB; a company that is manufacturing sailing rigs and that is located in Gothenburg.

     

    The project has been following a design process that is inspired from Archer’s three-phase model, which consists of an analytical part, a creative part and an executive part. The project started with an extensive pre-study that contained a market analysis of existing fittings today and interviews with users. After the pre-study the concept generation started with a Brainstorming session and then continued with more structured methods as the Idea generator and Contrast thinking. The methods resulted in three different concepts that were presented for Seldén. These concepts were then made as CAD-models as well.

     

    The concept selection started with a questionnaire that was sent out to the user-group where the three different concepts were presented. Next selection method was The Weighted Objective Method. It was the same concept that was chosen in both methods and after some discussions with Seldén a final decision could be made.

     

    The project resulted in a fitting that has a softer, rounder shape and a more simple design than the fittings Seldén are using today. The new concept also had a more effective tripp trigger-solution and a design that will release the rope in a more simple way. On the back of the fitting a shock-absorber was placed in the shape of a rubber-plate.

  • 327.
    Cervera Muñoz, Antonio
    University of Skövde, School of Technology and Society.
    Design of an Information Carrier Device for a Decision Support System2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Automation   in   manufacturing   leads   to   produce   faster   but   it   also   increases   level   of information and relationship between parts. That makes more dificult to manage the work of operators in the manufacture chain to keep productivity high. Furthermore, manual assembly still  plays  a  vital  role  in  most  of  the  factories  all  over  the  world.  Hence  the  importance  of implementing  an  efficient  Decision  Support  System  which  helps  operators  to  make  right decisions. This project approaches to the design of a device to get information to operators. The project belongs to the University of Skövde and it is carried out in cooperation with Volvo Cars.  In the first stages of the project diverse information is gathered through the literature review and  market  research.  Literature  review  approaches  to  manufacturing  organization,  mobile information  in  manual  assembly  and  ergonomics.  Market  research  inquire  about  handheld devices. Also requirements from operators and environment are adressed. Next stages focus on the generation of ideas to hand in the information to operators. Diverse methodology was used  such  as  brainwriting  or  morphological  chart,  leading  to  three  different  concepts.  The PNI  method  was  employed  to  select  the  best  one.  It  consists  of  using  handheld  devices against  paper  sheets  or  wider  screens.  Then,  three  kind  of  handheld  devices  were  thought. Moodboards  and  brainwritings  were  employed  to  explore  shapes  and  functions.  They  were presented  to  coordinators  in  the  factory  and  one  of  them  was  selected  to  be  further developed.  Mockups  of  different  sizes  were  constructed  and  more  drawings  specified  the dimensions in order to build a CAD model. The final product is small to be easily carried with a wide screen and a stylus to facilitate interaction. Battery ensures withstanding work shifts and components are designed to favor maintenance tasks. The final product was built using CAD  software  and  printed  on  3D.    Materials,  manufacturing  methods  and  technology  have been  reviewed  to  ensure  viability.  Finally,  last  chapters  discuss  about  diverse  topics concerning this project such as ethical, enviromental or economical   issues. Further  work is proposed, too.

  • 328.
    Chajma, Isbai
    et al.
    University of Skövde, School of Engineering Science.
    Isuri, Jayasooriya Patabendige
    University of Skövde, School of Engineering Science.
    Vidareutveckling av kylvästar för räddningstjänsten2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet är utfört av två ingenjörsstudenter inom integrerad produktutveckling. Projektet har ett samarbete mellan Räddningstjänsten i Östra Skaraborg och TST Sweden. Syftet var att vidareutveckla en befintlig kylväst som är tillverkad av TST och används av Räddningstjänsten.En förstudie på relevant information kring kylvästen utfördes för att ta fram projektets förutsättningar. En litteraturstudie genomfördes för att samla in information kring brandpersonalens termiska ergonomi och kylvästar. En marknadsundersökning utfördes för att få information om konkurrenternas produkter. Enkät- och observationsresultat bidrog till viktig information om användarnas krav och önskemål. All information som förekom under förstudien sammanställdes i en kravspecifikation, som även uppdaterades under hela projektets gång. Under konceptgenereringen användes olika systematiska och kreativa metoderför att kunna ta fram alternativa koncept. För att ta fram ett slutgiltigt koncept utfördes en konceptsållning och en konceptkombination i samverkan med företaget TST. En prototyp byggdes upp för att kunna förverkliga det slutgiltiga konceptet och ge målgruppen en chans att ge feedback. Resultatet blev ett koncept som motverkar både värme- och arbetsbelastning. De existerande problemen eliminerades genom att storleksanpassa och avlägsna obehag som uppkom vid användning av produkten. Ergonomiska funktioner såsom ett ryggstöd och vadderade axlar har applicerats för att förhindra dålig hållning och underlätta vid tung lyftning. Konceptet har även nya fästen med magnetiska klickspännen som bidrar till bättre justering och en ny funktionellfärg.

  • 329.
    Chiet, Cheong Wen
    et al.
    Universiti Tunku Abdul Rahman, Malaysia.
    Ching, Ng Tan
    Universiti Tunku Abdul Rahman, Malaysia.
    Huat, Saw Lip
    Universiti Tunku Abdul Rahman, Malaysia.
    Fathi, Masood
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Tzuu, Tan Jaw
    Universiti Tunku Abdul Rahman, Malaysia.
    The Integration of Lean and Green Manufacturing for Malaysian Manufacturers: A Literature Review to Explore the Synergies between Lean and Green Model2019In: International Conference on Sustainable Energy and Green Technology 2018 / [ed] Chong Wen Tong, Wang Chin-Tsan, Bernard Saw Lip Huat, Institute of Physics Publishing (IOPP), 2019, Vol. 268, article id 012066Conference paper (Refereed)
    Abstract [en]

    In general, profitability and efficiency have been the main interest for organization. However, the increasing concerns for the environment from government, regulators, customers and other stakeholders has forced companies to seek for alternatives to achieve green objectives. The difficulties faced by organizations are lack of awareness and guideline in implementing green practices in their daily operation. Under constrained resources, employers are reluctant to spend money on something unclear. During the last decade, lean manufacturing seems to be visible trend in most of the manufacturing industries in Malaysia. As lean tends to emphasize on waste reduction, it provides similarity between lean and green. Therefore, it is a better atmosphere to deploy green practices and tools under existing lean manufacturing. The purpose of this paper is to present a review on the synergies between green and lean and identifying the determinants that affecting both lean and green manufacturing for Malaysian manufacturers. The determinant obtained are financial benefit, incentive, legislation, stakeholder, management commitment, technology, environmental awareness and brand image or competitiveness. Besides, the authors identified and suggested future research directions on developing an integrated lean-green model for daily operation. This study aims to assist researchers to identify the opportunities and challenges on lean-green model and this review is useful for manufacturers and government in developing manufacturing policies and guideline.

  • 330.
    Cholat, Nils
    et al.
    University of Skövde, School of Business.
    Vall, Ludvig
    University of Skövde, School of Business.
    Citylogistik: med fokus på urbana konsolideringscenter2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In line with a constant and increasing urbanization, higher requirements are placed on the logistical flows in and out of urban areas. This entails, among other things, increased congestion and negative environmental impact due to the increased amount of transport. The management of logistical activities in urban areas has been gathered under the concept of city logistics. The idea of city logistics is to see the involved stakeholders as units in a larger logistic system. The logistics system has the task of streamlining and reducing the number of transports, which can be achieved through urban consolidation centers (UCC).

    The purpose of the study is to identify different aspects from the stakeholders' perspective, which argues for or against the introduction of a UCC. The study is intended to be directed at authorities whose interest is to introduce a UCC.

    The study’s issue focuses on developing advantages and disadvantages that arise for the relevant stakeholders in the city logistics when introducing a UCC terminal. To answer this issue and fulfill the purpose, interviews have been conducted with people related to UCC projects. The interviews are then supplemented with information from documents linked to these projects.

    The result shows that UCC is a city logistics solution that often requires compromises from the different stakeholders to achieve a common goal. This means that stakeholders often experience both advantages and disadvantages in connection with the implementation of a UCC. The stakeholder’s advantages and disadvantages should also be carefully weighed against each other, as an advantage for a stakeholder can be interpreted as a disadvantage for another.

     

  • 331.
    Christensen, Mick
    et al.
    University of Skövde, School of Engineering Science.
    Thörn, Albin
    University of Skövde, School of Engineering Science.
    Framtagning av automatiserat layoutförslag: Layout med human robot-kollaboration2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The industry today stands before challenges because of products shortened lifecycle and increased variation. Present systems are having a difficult time handling these demands. Collaborative robots (cobots) have been developed to overcome these problems and creating flexible and adjustable automation processes. Parker Hannifin in Skövde is a manufacturer of hydraulic and pneumatic couplings. All assembly is done manually at present, which can cause issues ergonomically for the workers. The productivity and quality are not suffering from any major problem now, still the company sees reasons to automate parts of the production. Partly because the importance of always trying to improve the production and ergonomic, but also the renewal of the company that follows is a reason.

    The purpose of the project is to find a workstation suitable for collaborative automation. The station and the processes are then to be studied to define what is needed for improvement through an automated layout. The goal is that the project will work as support for future decision concerning an investment. Different stations and moments will be studied for choosing an appropriate process to automate. Information regarding components needs to be collected, for mapping the needs of the layout. Comparisons will then be made from the concept’s parameters. Yearly cost between collaborative and manual station will be compared based on an approximately life time of the investment.

    Product type 1 is a new type of spill free product and its volume have good conditions to increase inthe future. Today the stations for manufacturing product type 1 and 2 have a high occupation. Station X was considered an appropriate candidate and was chosen for the project. After a compilation of the comparisons been made, the robot model UR5 from Universal Robots with a gripper from Robotiq and vision system from Sick, was chosen. A proposed layout was made where the robot is performing the last moments, 11‐15, of the assembly. The results showed that with an approximate life time of seven years, the investment would not be financially profitable compared to manual labour. The implementation should instead be investigated in a different station, concerning the high production volume that is needed in station X.

    The work has resulted in several solution for moments not included in the proposition. The project is still viewed as successful and the work as useful support for the future, despite results showing that the layout is not more profitable than today’s manual assembly. It is just not the economical aspect that is important to reflect over, but quality and ergonomic are fields that can benefit from collaborative robots.

  • 332.
    Christersson, Erik
    University of Skövde, School of Humanities and Informatics.
    Aktivt lärande genom conveyance inom digitala spel: Spelares engagemang och påverkan av inlärningstekniker inom digitala spel2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    I detta arbete jämförs explicit och förmedlande (conveyance) inlärningsteknik för kommersiella spel och undersöka hur de påverkar spelarens resultat samt kunskap om spelets struktur. Undersökningar från början av 1970-talet visar på hur aktivt lärande ökar deltagarens engagemang jämfört med vid passiv explicit inlärning. Mitt praktiska arbete består i att ta fram två olika inlärningsbanor, en för var teknik, och en utmaningsbana där spelaren får prova sina färdigheter. 

    Skapandet av den praktiska delen av examensarbetet har skett under praktik på Pieces Interactive i Skövde. Resultatet av studien indikerar att gruppernas inlärning är jämförbar, dock klarar personerna i den explicita gruppen uppgifterna snabbare, medan de i den förmedlande gruppen utforskar/förstår mer av spelet. Vidare forskning om förmedlande bandesign kan gynna spelbranschen, särskilt i utbildningssammanhang där syftet är att motivera deltagaren och stimulera till en djupare/intuitiv förståelse för uppgiften.

  • 333.
    Claeson, Emil
    University of Skövde, School of Humanities and Informatics.
    Ansiktsriggning för datorspel med Facial Action Coding System: Hur teorier om ansiktsmuskulatur och uttryck kan appliceras på digitala karaktärer2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Det här examensarbetet undersöker om ett anatomiskt system framtaget för att kategorisera ansiktsrörelser inom psykologisk forskning kan anpassas på en ansiktsrigg för att effektivare kunna framställa ansiktsanimation för datorspel. Rapporten beskriver varför Facial Action Coding System skapades, hur det används samt tar upp olika sammanhang som systemet tidigare använts för. Rapporten beskriver det praktiska arbetet för att konstruera en ansiktsrigg ämnat för datorspel och diskuterar skillnader mellan att rigga för datorspel och film. Examensarbetet beskriver klassiska användbarhetsprinciper och vad man bör tänka på när produkten skall bli så användningsbar som möjligt. Ett animationsverktyg baserat på FACS och de ”Action Units” som systemet innehåller har tagits fram för att genomföra undersökningen på animatörerna från min praktikplats på Starbreeze Studios AB. Produkten uppskattades av dess användare och slutsatser gick att dras i förhållande till rapportens frågeställning. FACS-systemet utvecklades dock inte för datorspel, vilket märks eftersom funktioner såsom fonems dessvärre saknas bland de fördefinierade ”Action Units” som annars hade effektiviserat systemet ytterligare. 80 % av respondenterna skulle kunna tänka sig att använda det framtagna systemet för en spelproduktion vilket pekar på FACS potential inom Spelproduktion.

  • 334.
    Claesson, Frida
    et al.
    University of Skövde, School of Technology and Society.
    Hilletofth, Per
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    In-transit distribution as a strategy in a global distribution system2011In: International Journal of Shipping and Transport Logistics, ISSN 1756-6517, E-ISSN 1756-6525, Vol. 3, no 2, p. 198-209Article in journal (Refereed)
    Abstract [en]

    Distribution has become a key factor in today’s logistics system due to companies’ desires to achieve considerable economies of scale in production, achieved by focused factories, as well as customers’ demands for shorter lead-times and customer adapted products. The purpose of this research is to investigate if the in-transit distribution strategy may offer companies a competitive advantage and may be used as a complement to the centralised distribution strategy and/or the decentralised distribution strategy. This study shows that the in-transit distribution strategy can give major competitive advantages by offering rather short lead-times for customers without having to store products locally in warehouses. This, in turn, gives lower warehousing costs, lower tied-up capital, a less interrupted manufacturing, and steady and continuous production volumes. In order to be successful with this strategy, it takes good planning, working closely with customers, good market knowledge, and an enterprise resource planning (ERP) system that is able to support the strategy sufficiently. Among these factors, low variation in demand as well as manufacturing output is required, and furthermore distribution lead time needs to be predictable.

  • 335.
    Claesson, Frida
    et al.
    University of Skövde, School of Technology and Society.
    Hilletofth, Per
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Hilmola, Olli-Pekka
    Lappeenranta University of Technology.
    Supply Chain Planning in Automotive Sector: Swedish Case Study2011In: Conradi Research Review, ISSN 1459-0980, Vol. 6, no 2, p. 33-54Article in journal (Refereed)
    Abstract [en]

    This research aims to enhance the current level of knowledge from supply chain planning (SCP) by analyzing the importance of collaboration, information exchange and a supporting information system in its successful execution. These are examined through a case study from international manufacturing company, which operates in automotive industry with its global manufacturing network. Research reveals that collaboration is a complex and important issue of SCP, and occurs simultaneously in vertical and horizontal dimensions. It is important to select strategic partners and to develop a structured work processes and routines. The main objective of collaboration is to determine common goals and objectives and to facilitate the exchange of information; these together drive the performance of a supply chain higher. A sufficient information system supporting the SCP is vital to facilitate collaboration, and information exchange between the different supply chain participants. However, currently in the case company quite many phases of SCP are completed without appropriate and integrated information systems and the process itself contains several manual phases.

  • 336.
    Claezon, Daniel
    University of Skövde, School of Informatics.
    Pedagogisk förmedling: En studie kring 3D-grafikens pedagogiska möjligheter inom kulturella institutioner2016Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Under arbetets gång har en 3D-modell av ett historiskt skepp ritat av Fredrik Henrik af Chapman skapats, i ett pedagogiskt syfte att kunna besvara undersökningens frågor. Skeppet modellerades i anslutning till ett reellt skeppsbygge som drivs av Forsviks Varv, vars mål är att återskapa ett av Chapmans skepp. Modellen renderades ut i bild samt videoformat, och visades i samband med den kvalitativa undersökningen genom en Ipad för att kunna ge betraktaren en förståelse av det digitala mediet. Examensarbetet har sedan genomförts med följande frågeställningar som utgångspunkt: - Finns det någon skillnad på hur en slutlig variant av prototypen bör utformas baserat på grupperna, och i så fall vilka? - Finns det skillnader på vad besökare och experter från varv och museum anser gällande reella/fysiska artefakter och en digital version av sådana, och i så fall vilka? Informanterna som studien är baserad på blev indelade i tre fokusgrupper: Experter och anställda inom skeppsvarv, besökare samt experter och anställda inom museibranschen. Studiens resultat redovisas i slutet av arbetet, där en diskussion förs kring den aktuella artefakten och ett eventuellt framtida arbete.

  • 337.
    Clarke, Benjamin
    et al.
    University of Skövde, School of Informatics.
    Rasmussen, Johanna
    University of Skövde, School of Informatics.
    Narrativa menyer: Användargränssnitt i tredimensionell virtuell rymd2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete beskriver produktionen och utvärderandet av en huvudmeny för spel, vars funktioner lokaliserats i en tredimensionell virtuell rymd. Syftet är att presentera ett alternativt sätt att producera användargränssnitt, som i större grad tillåter för narrativa uttryck i menyer. Artefakten har producerats med utgång i affordance teori (Norman 1999) och Fernández-Varas indexikala berättelsemodell för spelrymd (2011). Den kvalitativa undersökningen av artefakten indikerar på att erfarna spelare tycks uppskatta lokaliserade gränssnitt, och att det tycks förgylla spel- och berättelseupplevelsen. Dock tycks de föredra traditionella, tvådimensionella menyer för deras effektivitet. Vidare forskning krävs för att avgöra till vilken grad detta resultat stämmer, och även för vilka typer av spel/spelare som ett lokaliserat gränssnitt skulle föredras.

  • 338.
    Clavero Bernal, Sergio
    et al.
    University of Skövde, School of Engineering Science.
    Fernandez Perrote, Clara
    University of Skövde, School of Engineering Science.
    Detailed flow simulation of AGV traffic and material handling2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The goal of the project is to make comparisons and evaluate single lane with two-way traffic flow, different ways of ordering and signal handling in a specific area of VCBC Upper Plant in Olofström. For that purpose, the simulation has been built with the support of the discrete event simulation software Tecnomatix Plant Simulation by Siemens to analyze the different outcomes and scenarios, in order to get a better understanding of how it currently works and the future improvements that could be implemented in the model. The final aim is to get a more efficient material flow in the production line, as well as better AVG traffic in the mentioned area.

    The accomplishment of this project was carried out in collaboration with Volvo Cars Engine Skövde and VCBC Volvo Olöfstrom and the University of Skövde, Sweden in order to achieve the Bachelor degree in Automation Engineering and providing all the necessary material and data to build this model.

    The results show a clear improvement after implementing a second track in the model, with different impacts in different stations but with a noticeable gain in the overall efficiency in all of them.

  • 339.
    Cohen Laizerowitch, Alexis
    et al.
    University of Skövde, School of Engineering Science.
    Gómez Reyes, Alejandro
    University of Skövde, School of Engineering Science.
    Furniture design within an existing line of products focused on CAD modelling2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report aims to covers the conduction of a final thesis project for the University of Skövde in collaboration with J.Design studio (Stockholm).

    The purpose of this project is applying and evaluating CAD and different tools related to the field of 3D CAD within design and product development phases. This has been achieved by the development of two pieces of furniture from a defined line of products stated by existing clients of J.Design.

    The initial phase of the project was knowing the design limitations from both clients and their stakeholders. Once these limitations were known, a pre-study phase where 3D CAD modelling was set as the key tool for the research was done. This research identified related tools with CAD that are applied during the development design phase. Starting the development of the two case studies, the user needs’ phase was the first step in the process, followed by a benchmarking study, an ergonomics study, and finally, setting these requirements into a requirement list. Then, the design development phase took place, covering initial sketches until the detailed final solutions. As a final step, the use of the identified tools was evaluated and analysed based on the experience from the two case studies of this thesis project.

    From this evaluation came the conclusion that these tools need to take part in the design phase in a certain moment depending on the level of development, and as the level of sophistication of the tool increases, the information and detail provided are also higher.

  • 340.
    Cortés García, Daniel
    et al.
    University of Skövde, School of Engineering Science.
    Ruiz González, Álvaro
    University of Skövde, School of Engineering Science.
    Laser welding machine specification research2019Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This paper presents the technical specification of a laser welding machine, which main purpose is the weld of thin aluminium sheets. With the application of laser machines in automotive, aerospace, and other industries, it has become of crucial importance for a company working in those fields to keep updated with the technological progress. In this thesis, a deep research in laser machines and its applications has been done. The primary objective of this thesis is to gather knowledge about laser machines to help our client to find the machines they need. Among the several types of machines, the difference in the choice relied on which main type of industrial laser should be used: carbon dioxide (CO2) or neodymium-doped yttrium aluminium garnet (Nd: YAG). The second objective of this thesis is to find the best way to demand those machines to the procurers: to give detailed specifications to the procurers, or to give them just guidelines on what the machine must have and should have. The key results obtained from the research were that laser source to use is the Nd: YAG and that the most appropriate shielding gas is Argon. Therefore, in conclusion, the specifications stated in the table will help our client to acquire the laser machine they demand; as well as spending the money efficiently.

  • 341.
    Cosimato, Pasquale
    University of Skövde, School of Informatics.
    A COMPARISON OF VISUALISATION TECHNIQUES FOR A BICYCLE SIMULATOR2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this project, the perception of distance and the degree of immersion in a game, with two different visualisation techniques, have been evaluated. A bicycle simulator was used, and the game has been tested in a non-immersive virtual reality, by projecting the game on a screen, and using an immersive virtual reality by Oculus Rift. The study provides a preliminary investigation that focuses on how humans can perceive the distance, an overview of the term immersion and how to quantify this component.Regarding the study of the perception of distance, to subjects who have tested the game has been asked their perceptions of distance with respect to a given object. The immersion was studied and evaluated using a questionnaire given to each subject.The results showed an underestimation of distance in both the visualisation of the game, precisely a greater underestimation respect to real distance when the screen was used was found.The degree of immersion did not detect large differences between the two visualisation techniques.

  • 342.
    Cox, Astrid
    University of Skövde, School of Engineering Science.
    Development of Components for a Heat Recycling Shower System2016Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Given the unstable state of the environment, there is an undeniable need for the development of sustainable technologies. This need affects all areas of everyday life, even the shower. Modern shower systems result in energy waste in the form of heat, which can be minimized through the implementation of a heat exchanger.

    In cooperation with Consat SES this project developed a system to implement a heat exchanger using an in-shower water transportation pipe. A fitting non-electrical pump and motor were also chosen.

    To develop these elements a general design methodology of defining the problem, identifying the solution space, developing concepts, testing concepts and proposing a design, was used with adaptations for the component at hand. By following this strategy for each component and then reviewing the system as a whole, a new shower system was developed with a trapezoidal water transport pipe, a wing pump, and a turgo turbine. 

  • 343.
    Crowston, Kevin
    et al.
    Syracuse University, Syracuse, NY, USA.
    Hammouda, ImedUniversity of Gothenburg, Sweden.Lundell, BjörnUniversity of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.Robles, GregorioGSyC, Universidad Rey Juan Carlos, Madrid, Spain.Gamalielsson, JonasUniversity of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.Lindman, JuhoChalmers, Gothenburg, Sweden / University of Gothenburg, Gothenburg, Sweden.
    Open Source Systems: Integrating Communities: 12th IFIP WG 2.13 International Conference, OSS 2016, Gothenburg, Sweden, May 30 - June 2, 2016, Proceedings2016Conference proceedings (editor) (Refereed)
    Abstract [en]

    This book constitutes the refereed proceedings of the 12th International IFIP WG 2.13 International Conference on Open Source Systems, OSS 2016, held in Gothenburg, Sweden, in May/June 2016. The 13 revised full papers presented were carefully reviewed and selected from 38 submissions. The papers cover a wide range of topics related to free, libre, and open source software, including: organizational aspects of communities; organizational adoption; participation of women; software maintenance and evolution; open standards and open data; collaboration; hybrid communities; code reviews; and certification.

  • 344.
    Cámara Vela, Juan Antonio
    et al.
    University of Skövde, School of Engineering Science.
    Sánchez Molina, Juan Manuel
    University of Skövde, School of Engineering Science.
    Design of a Double Cantilever Beam Test Specimen and Fixture for Kink Band Formation in Unidirectional Fibre Reinforced Composites.2015Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Composite materials are widely used in demanding applications in aerospace and other industries. In order to understand the complex behaviour of the composite materials and their components, standardised test methods are used. One example is the double cantilever beam (DCB) test in which the test specimen is loaded in an opening, i.e., tensile mode. Failures in composite materials loaded compression are different from those in tension, for example, kink band or buckling-like failures can occur.

    In this project, several DCBs are designed and a new fixture which allows for compression testing of a DCB is developed for an existing Instron testing machine. The fixture overcomes a known problem of tensile peak causing the failure of the adhesive at the inner surfaces of the DBC by applying additional compressive loads along the outer surfaces of the DBC. The compressive forces can induce the desired kink band formation so that researchers can better study the failure mode.

    The conceptual development of the new DCBs and the new fixture are presented. Several prototypes of the specimens and the fixture are modelled using the three-dimensional (3D) computer-aided design software Creo Parametric 2.0.  One of the fixtures is selected to further study. The different DCB specimens are studied in order to obtain information about the kink band using 3D finite element analysis with the software programme Abaqus CAE. The selected fixture is analysed to determine if there are any areas of concern. Finally, the behaviour of the compression stress along the DCB using two pairs of forces is studied.

    Unfortunately, it is determined that the tensile peak experienced by the adhesive cannot be eliminated by the application of two pairs of compressive loads, one at the free end and the other in the vicinity of the tensile peak. Several suggestions are made for future work which might serve to reduce the tensile peak; e.g., the movable force couple is applied as a surface load instead of a point load. For this, the fixture will have to be modified with a new geometry, although the DCB could be the same. This will allow further work to focus on the combined behaviour of the tensile peak and the fixture.

  • 345.
    Da Lio, Mauro
    et al.
    Dept. of Industrial Engineering University of Trento, Trento, Italy.
    Mazzalai, Alessandro
    Dept. of Industrial Engineering University of Trento, Trento, Italy.
    Windridge, David
    Dept. of Computer Science Middlesex University, London, United Kingdom.
    Thill, Serge
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre. Centre for Robotics and Neural Systems, University of Plymouth, United Kingdom.
    Svensson, Henrik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Yueksel, Mehmed
    Robotics Innovation Center - DFKI GmbH German Research Center for Artificial Intelligence Bremen, Germany.
    Gurney, Kevin
    Dept. of Psychology University of Sheffield, Sheffield, United Kingdom.
    Saroldi, Andrea
    Centro Ricerche Fiat S.C.p.A. Orbassano (TO), Italy.
    Andreone, Luisa
    Centro Ricerche Fiat S.C.p.A. Orbassano (TO), Italy.
    Anderson, Sean R.
    Dept. of Automatic Control and Systems Engineering University of Sheffield, Sheffield, United Kingdom.
    Heich, Hermann-Josef
    Consulting – Research – Project Management Heich Consult GmbH, Hürth, Germany.
    Exploiting Dream-Like Simulation Mechanisms to Develop Safer Agents for Automated Driving The "Dreams4Cars" EU Research and Innovation Action2017In: 2017 IEEE 20th International Conference on Intelligent Transportation Systems (ITSC), IEEE, 2017Conference paper (Refereed)
    Abstract [en]

    Automated driving needs unprecedented levels of reliably and safety before marked deployment. The average human driver fatal accident rate is 1 every 100 million miles. Automated vehicles will have to provably best these figures. This paper introduces the notion of dream-like mechanisms as a simulation technology to produce a large number of hypothetical design and test scenarios - especially focusing on variations of more frequent dangerous and near miss events. Grounded in the simulation hypothesis of cognition, we show here some principles for effective simulation mechanisms and an artificial cognitive system architecture that can learn from the simulated situations.

  • 346.
    Dabbagh, Armanj
    et al.
    University of Skövde, School of Technology and Society.
    Garza, Carlos
    University of Skövde, School of Technology and Society.
    Finite Element Analysis of the Vasa’s Bottom Structure2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The royal warship Vasa sank on its maiden voyage outside Stockholm and was salvaged more than 300 years later in 1961. Nowadays the vessel lies in its eponymous museum in Stockholm on a dry dock. However, it was determined that the ship cannot handle its own weight in a satisfactory manner with the current support system. Measurements during the past ten years have ascertained that the upper structure components of the hull are slowly deforming, mostly due to creep behavior.

     

    A new support system for the ship needs to be designed in the near future and therefore, the mechanical behavior of its structural members and the stresses they are subjected to have to be determined. Factors that complicate a stress analysis include both inhomogeneity of the oak’s mechanical properties and limited opportunities for experimental testing. Furthermore, contamination, microbial degradation and preservation agents have significantly changed the integrity of the oak.

     

    In this project a section of the Vasa’s bottom structure is studied through Finite Element Analysis in order to determine the stresses and deformations originated by the support system and to have a better understanding of these effects on the ship’s structure. Due to the considerable deterioration of the oak, especially on the external structural members, several assumptions are considered in order to perform analytical calculations to determine appropriate material properties for the FE-Models. 

     

    After performing the computational simulations, the obtained results indicate that the bottom structure exhibits sufficient mechanical integrity to endure the stresses generated by the support system. Even by assuming the possibility of several damaged structural connections, only a minor difference of the effects of the reaction forces on the structure members was determined.

     

    The thesis work ends with further conclusions from the performed analysis and suggested future work.

  • 347.
    Dahl, Oskar
    University of Skövde, School of Humanities and Informatics.
    Vetenskaplig undersökning av mönster i sömlösa texturer2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete undersöker hur applikationen av vetenskapliga teorier inom visuell perception, gestaltpsykologi och färglära kan påverka uppkomsten av oönskade mönster i sömlösa texturer och om detta kan ge en grafiker en bättre förståelse för hur man kan undvika dessa oönskade mönster i sömlösa texturer.

    För att undersöka detta så skapades tre texturer med tre varianter vardera. I texturvarianterna applicerades de tidigare nämnda teorierna för att motverka respektive framhäva uppkomsten av oönskade mönster.

    Nio kvalitativa intervjuer genomfördes där informanterna fick se samtliga texturer och deras texturvarianter och sedan svara på frågor. Svaren analyserades och jämfördes med de tidigare nämnda teorierna. Samtliga informanter påverkades av applikationen av de vetenskapliga teorierna, men de uppfattade upprepningen på olika sätt beroende på hur ofta de spelade datorspel.

    Anledningen till att informanterna uppfattade upprepningen i texturerna olika är något som skulle vara intressant att undersöka i framtiden.

  • 348.
    Dahlberg, Erik
    et al.
    University of Skövde, School of Business.
    Fohlén, Weronica
    University of Skövde, School of Business.
    Hållbarhetsutvärdering - LCSA Analys: av trucksystem inom intern materialhantering2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The amount of organizations that choose to work with sustainability is increasing due to the potential competitiveness it causes. Working with sustainability may include sustainability evaluations, which can be done through the LCSA analysis method. The purpose of this report is to evaluate and analyze a manufacturing company's current climate impact due to carbon dioxide equivalent emissions from diesel-powered forklifts within internal material handling. Further, the report aims to illustrate how a sustainability evaluation can be conducted to identify ecological, economic and social impact. In the report, a sustainability evaluation of forklift systems is performed to identify the theoretically best alternative, compared to a case company's current situation. The method used for the sustainability evaluation is LCSA analysis. In addition to the results of the sustainability evaluation, the interface between theoretically and practically best forklift system alternatives is considered.  The case company Volvo GTO in Skövde, currently have 18 diesel-powered forklifts, which have different capacities and functions. The current fuel for all forklifts is Diesel Mk1. The flows today generally set high demands on the forklifts technical capacity, for example on, travel speed, climbing ability, traction force and lifting and lowering speed. In the year 2017, the 18 diesel-powered forklifts contributed with a climate impact of approximately 237 tonnes of carbon dioxide equivalents, considering the entire life cycle of Diesel Mk1 and the forklift fleets total run time.  Regarding the sustainability evaluation LCSA analysis, it is performed on forklift systems powered by Diesel Mk1, HVO-Diesel, lead acid batteries and lithium-ion batteries within the capacities 3.5, 5 and 8-tonne. The analysis considers the three pillars of sustainability. Further, the technical specifications of the forklift systems are considered and compared with the current diesel-powered fleet. Generally, a lower technical capacity can be seen in the electric forklift systems, which may affect the ability to implement those at the case company. Theoretically lowest ecological and social impact can be seen within the lithium-ion battery-powered forklift systems, the lowest impact on the economic pillar is seen in the lead acid battery systems. Based on the case company's current flows and demands, the authors recommend HVO-Diesel-powered forklift systems, as they have the same technical capabilities as well as lower ecological and social impacts. Limitations has been set for the reports analyzes, regarding process boundaries and impact indicators. For future sustainability evaluations, the authors recommend that wider process boundaries and more impact indicators are applied to identify the total impact within the pillars of sustainability. The report comprehends examples of impact beyond selected process boundaries, such as emissions affecting over time or exploitation. During the progress of this report, information gaps have been discovered in different areas. Regarding research of sustainability evaluations, proven methods are lacking. Therefore, established methods for evaluation are desired. A gap in research of forklift theory has also been noted.

  • 349.
    Dahlberg, Niklas
    et al.
    University of Skövde, School of Technology and Society.
    Gundén, Ann-Christin
    University of Skövde, School of Technology and Society.
    Utveckling av förpackningssystem för torra insatsvaror i livsmedel2009Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This project includes development of new packaging for dry spices and an investigation of how to automate the production line. The preliminary investigations show needs of an environmental friendly packaging possible to re-close. After screening for suitable materials three concepts were developed, a stand-up pouch, a plastic jar and a metal can. The pouch was excluded in a concept choosing process. In this process it was also decided to further develop the metal can concept. This resulted in the development of an integrated cap for metal cans of standard design, which is the final packaging concept. 

    Time studies and logistic analyses were carried out on the production line to give information for the automation part of the project. These analyses show that it is possible to reduce costs by automate parts of the production line. However higher production volumes are necessary to benefit from a fully automated production line. Apart from automation, time and cost should be possible to save by implementing continuous improvement work.

     

  • 350.
    Dahlbom, Anders
    et al.
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    Nordlund, Per-Johan
    Aeronautics, Saab AB, Linköping, Sweden.
    Detection of Hostile Aircraft Behaviors using Dynamic Bayesian Networks2013In: Proceedings of the 16th International Conference on Information Fusion, IEEE Press, 2013, p. 2033-2040Conference paper (Refereed)
    Abstract [en]

    Aircraft Combat Survivability in military air operations is concerned with survival of the own aircraft. This entails analysis of information, detection and estimation of threats, and the implementation of actions to counteract detected threats. Beyond visual range weapons can today be fired from one hundred kilometers away, making them difficult to detect and track. One approach for providing early warnings of such threats is to analyze the kinematic behavior of enemy aircraft in order to detect situations that may point to malicious intent. In this paper we investigate the use of dynamic Bayesian networks for detecting hostile aircraft behaviors.

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