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  • 1.
    Adelakun, Olawale
    University West, School of Business, Economics and IT, Divison of Informatics.
    The Role of Business Intelligence in Government: A Case Study of a Swedish Municipality Contact Center2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    The aim of this study is to investigate the role Business Intelligence (BI) can play in government and more specifically at the municipality level. The study aims to investigate how data collected from a municipality Contact Center can be leveraged with the help of a BI solution. The study focuses on the Contact Center at Järfälla Kommun (municipality) and investigates whether a BI implementation can help to realize more effective planning, resource allocation and improved services and e-services. Municipality Contact Centers are becoming an increasingly popular precedent providing municipal residents with a centralized service where they can make inquiries, provide information, lodge complaints or commend actions related to activities within the specific municipality. BI can turn raw data into concrete figures and reports, map patterns and trends and support effective decision making. It can also however be costly and difficult to integrate and face resistance due to perceived complexity. This paper aims to take such notions into consideration and investigate the feasibility of implementing such a solution in the context of a municipality Contact Center.

    This paper identifies various benefits and drawbacks from literature which are then modeled into a SWOT framework. In addition, semi-structured interviews are utilized in this study and targeted at stakeholders knowledgeable in the Contact Center, BI, or both. Findings from the SWOT framework will be measured against the findings from the interviews and an analysis of correlations between the two sources will be investigated.

    Download full text (pdf)
    Business_Intelligence_Government
  • 2.
    Alizadeh-Khameneh, Mohammad Amin
    et al.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Eshagh, Mehdi
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Sjöberg, Lars
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    The Effect of Instrumental Precision on Optimisation of Displacement Monitoring Networks2016In: Acta Geodaetica et Geophysica Hungarica, ISSN 1217-8977, E-ISSN 1587-1037, Vol. 51, no 4, p. 761-772Article in journal (Refereed)
    Abstract [en]

    In order to detect the geo-hazards, different deformation monitoring networks are usually established. It is of importance to design an optimal monitoring network to fulfil the requested precision and reliability of the network. Generally, the same observation plan is considered during different time intervals (epochs of observation). Here, we investigate the case that instrumental improvements in sense of precision are used in two successive epochs. As a case study, we perform the optimisation procedure on a GPS monitoring network around the Lilla Edet village in the southwest of Sweden. The network was designed for studying possible displacements caused by landslides. The numerical results show that the optimisation procedure yields an observation plan with significantly fewer baselines in the latter epoch, which leads to saving time and cost in the project. The precision improvement in the second epoch is tested in several steps for the Lilla Edet network. For instance, assuming two times better observation precision in the second epoch decreases the number of baselines from 215 in the first epoch to 143 in the second one.

  • 3.
    Alwahami, Ali
    et al.
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Ibrahim, Gabriella
    University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
    Livscykelanalys av cykelmodell BCF Gravel2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Borås Cykelfabrik is a Swedish company that assembles and sells bicycles. The company offer both customized and prebuilt bikes such as mountain bikes, gravel/cross and road bikes made of carbon fiber composite and aluminum alloy.

    Bicycle sales have increased by 30 % during 2019–2020 because of the COVID-19 pandemic and increased environmental awareness in the society. Thus, Borås Cykelfabrik sees potential to increase its sales of bicycles. In line with increasing environmental awareness in society, the demand for sustainably produced bicycles increases. The company therefore has an interest in comparing three different bicycle models with carbon fiber, aluminum, and steel frames regarding their environmental impact.

    The purpose of the following life cycle study is to provide a theoretical basis for the environmental impact of the three bicycle models during each phase. The phases examined in the study are material production, manufacturing, use, transport, and end-of-life. For data collection concerning energy use and carbon footprint, Granta EduPack 2020 database was used.

    The results show that the bicycle model with a steel frame has the least environmental impact in comparison with the models with carbon fiber- and aluminum frames. On the other hand, it appears that the model with carbon fiber frame has the greatest potential for improvement. The largest share of energy consumption and carbon dioxide emissions occurs during the production of materials for all bicycles.

    To achieve a bicycle with a circular flow, there are three significant factors. These factors are the choice of material, how the product is disposed of and the transportations.

  • 4.
    Andersson, Peter
    University West, School of Business, Economics and IT, Division of Media and Design.
    Bilderna som räknas: En kvalitativ studie om upplevda skillnader i bilder från renderingsmotorerna Arnold, Cycles, LuxCore och Renderman2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are many options available for path-tracing render engines today. This study aims to investigate differences between images produced by different path-tracers that all use the same 3D data. This was done through the creation of a 3D-scene including an everyday object that was rendered by four different engines: Arnold, Cycles, LuxCore and Renderman. The resulting images were presented to six test subjects, three with previous knowledge in 3D-graphics and three with no previous knowledge in 3D-graphics. Semi-structured qualitative interviews were conducted in order to examine whether the test subjects experienced any differences between the images, with special emphasis on depth of field, noise and attractiveness of the images. The render times for the different engines were compared.

    The results show that the test subjects experienced great differences between the images. Experienced and non-experienced alike had no difficulty pointing out differences between the images, on some observations they all concurred, on some they expressed different opinions. The render times differed greatly for the different engines even though they all used the same number of samples. The conclusion of this paper is that, because the different engines work in slightly different manners, they produce pictures that are perceivably different even when they use the same 3D-data.

  • 5.
    Arfvidsson, G. F.
    et al.
    School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Stockholm (SWE).
    Ljungdahl Eriksson, Martin
    University West, School of Business, Economics and IT, Division of Media and Design.
    Lidbo, H.
    Rumtiden, Stockholm (SWE).
    Falkenberg, K.
    School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology.
    Design Considerations for Short Alerts and Notification Sounds in a Retail Environment2021In: Proceedings of the Sound and Music Computing Conferences, Sound and Music Computing Network , 2021, Vol. 2021-June, p. 261-267Conference paper (Other academic)
    Abstract [en]

    The design and noticeability of alert sounds have been widely researched and reported, and not least, notification sounds are ubiquitous in both software and hardware product development. In an ongoing research project concerning the retail industry, we aim at designing short alert sounds that only grab attention from one group of customers, while others do not register the alerts: this particular aspect has to our knowledge not yet been studied. To establish design guidelines for such alert sounds, we conducted an experiment where test subjects would experience ordinary shopping activity including background music and an ambient soundscape in a virtual reality clothing store, but with added alert sounds. We tested, specifically, six differently designed sound alerts belonging to two classes: contextual-specific congruent sounds, and incongruent sounds that did not fit the sonic context. The results disproved our assumptions that incongruent sounds would outperform the congruent and thus in the context more anticipated sounds. The findings suggest that alert sounds can be designed with subtlety and still be noticeable and that customers will not necessarily be annoyed. We present here a first approach towards design guidelines for short alert sounds in a shop environment. Copyright: © 2021 the Authors.

    Download full text (pdf)
    OpenAire
  • 6.
    Arkevall, Martin
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Lundgren, Simon
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Återställning av filer: jämförelse av tre gratisverktyg2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    To try find a lost file which has been deleted by mistake is probably a common issue for many users. The fact that the recycle bin has been erased too makes the situation more complicated. Or even worse, if a whole partition was reformatted and overwritten. Most users are aware of available support either by contacting a data recovery company or by searching the internet for free tools. Because of the above mentioned common issues, the project has selected three recovery tools to test and compare to find out which tool performs best regarding recovery out of a selection of lost common files. The selection of tools were based from a list with mandatory requirements. The three tools that passed the list was Recuva, Lazesoft and Puran. The results showed variances between the tools where one tool was best in test to recover files back to its original. Another tool performed best when the original size increased after file recovery but the actual data still was functioning properly.

  • 7.
    Bengtsson, Simon
    et al.
    University West, School of Business, Economics and IT, Division of Media and Design.
    Nyholm, Carl
    University West, School of Business, Economics and IT, Division of Media and Design.
    Kortfilm - födkrok eller språngbräda?: En undersökning om de digitala plattformarnas påverkan på distributionen av svensk kortfilm2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The intent of this paper is to examine the conditions for Swedish filmmakers with the short film format as final goal. Through a qualitative study we investigate what paths there are for distributing short films through the digital platforms available today. We do this by interviewing some of the most experienced and successful short film creators in Sweden and one of Sweden's main financier in film creation, to provide as just image of the branch as we can.

    Short films with financing from the state and regional financiers rarely has any focus on economic gain. They are rather intended to help form filmmakers and give them an opportunity to establish themselves prior to further filmmaking.

    The main digital platform in Sweden is SVT Play, witch is much based on the fact that SVT is part of sponsoring a big part of the government financed short films. The greatest problem we found is the availability for short films through digital platforms, since SVT Play most often has exclusive rights and only buy viewing rights during periods.

    When you want to distribute your short film, the most important aspect is the context, the film should not only appeal the audience it reaches but it also has to appeal the audience in the situation where it reaches them.

    Download full text (pdf)
    fulltext
  • 8.
    Bernhard, Irene
    University West, Department of Economics and IT, Division of Media and Design.
    Incentives for Inclusive e-Government: The Implementation of Contact Centers in Swedish Municipalities2015In: Digital Solutions for Contemporary Democracy and Government / [ed] Bwalya, Kelvin Joseph & Mutula, Stephen, IGI Global, 2015, 1, p. 304-327Chapter in book (Refereed)
  • 9.
    Brahm, Fredrik
    et al.
    University West, Department of Engineering Science.
    Kristiansson, Lennart
    University West, Department of Engineering Science.
    Wennerström, Joakim
    University West, Department of Engineering Science.
    Energimätning vid Högskolan Väst2011Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Svenskarna är med en elförbrukning av cirka 15000 kWh per person de fjärde största elför-brukarna i världen. Det beror främst på det kalla klimatet, men även stora industrier med hög elförbrukning bidrar till konsumtionen. Högskolan Väst förbrukar årligen 3 miljoner kWh. Med stigande elpriser och ett ökat fokus på miljöpåverkan önskar skolan att sänka sin förbrukning.

    Examensarbetet har utförts på uppdrag av kWh kontroll och NEA gruppen. Mätningar har utförts på matande ledning till skolans alla huskroppar samt dess ventilation. Syftet med examensarbetet var att lokalisera energiförbrukare inom Högskolan Väst och ge förslag för att minska förbrukningen med fokusering på minskad belysning nattetid och helger. För att mäta elförbrukningen användes elkvalitetsanalysatorer och enklare energimätare.

    kWh kontroll har som mål att sänka elförbrukningen med 6 % vilket motsvarar 180000 kWh per år. Under Earth Hour sänktes förbrukningen med 40 kW i huskropparna E-J och 10 kW i huskropparna B-D. Baserat på dessa resultat skulle det genom att släcka ner natte-tid, då skolan är larmad, innebära en årlig besparing på 115000 kWh.

    Energimätningar har även gjorts på datorer och resultatet visade att om strömmen till sko-lans datorer kan brytas under larmad tid skulle detta ge en besparing på cirka 8200 kWh om året.

    Rapporten visar att Högskolan Västs elförbrukning under nattetid går att reduceras enligt de olika förslag som beskrivs.

    Download full text (pdf)
    Rapport111026III
  • 10.
    Broberg, Patrik
    University West, Department of Engineering Science, Division of Process and Product Development.
    Evaluation of a method to radiometric calibrate hot target image data by using simple reference sources close to ambient temperatures2010In: Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXI / [ed] Gerald C. Holst, Keith A. Krapels, 2010Conference paper (Other academic)
    Abstract [en]

    To perform radiometric calibrations of image data, reference sources are needed in order to acquire data at two or more radiance levels giving the calibration parameters. Due to sensor drift for detectors in the infrared region the parameters have to be frequently recalculated during an extended signature measurement if the accuracy is to be maintained. In signature measurements where the incident radiance levels from hot targets are exceeding the background by many orders of magnitude the reference sources need to emit radiation at high radiance levels. Such reference sources are more complex and so is the handling of these sources. The calibration procedure tends to become impractical in field trials where several spectral bands are involved, which increases the need for reference data and the number of reference sources. A method to radiometric calibrate hotspot target data by using only a few simple reference sources close to ambient temperatures has been evaluated in this paper. Reference data has been collected both in laboratory studies and in field trials at various weather conditions. The accuracy and the precision of the method are presented. The uncertainty due to sensor drift is estimated. Error sources connected to the calibration method are discussed.

  • 11.
    Bäckman, Kjell
    University West, School of Business, Economics and IT, Divison of Informatics.
    Automatic fitness in generative jazz soloimprovisation2012In: EIMAS 2012 Conference Proceedings, Juiz de Fora, Brazil, 2012, p. 1-10Conference paper (Refereed)
    Abstract [en]

    Recent work by the author has revealed the need for an automatic fitness function in the evolutionary algorithm

    for generation of jazz solos. A computer based automatic fitness function enables greater populations and a great

    number of generations within a manageable time. This paper describes how the automatic fitness function is

    implemented using score calculation based on specific events recognized in the solo line The evaluation function

    is based on the author’s solo analysis of 73 great masters’ solo characteristics and their techniques used for buildup

    of jazz solos.

    Download full text (pdf)
    EIMAS 2012
  • 12.
    Choquet, Isabelle
    University West, Department of Informatics and Mathematics.
    Nozzle exit geometry and lump formation in atmospheric plasma spraying2005In: International Thermal Spray Conference: Basel, Switzerland, May, ASM International , 2005, p. 259-264Conference paper (Other academic)
    Abstract [en]

    Plasma spraying operations performed with high carrier gas flow rate may improve the coating properties but they can also lead to lump formation and thus coating defects. The damaged work piece must then be stripped and re-coated, which implies a considerable waste in terms of coating powder, energy and time. The aim of this study was to determine the cause of the lumps, and propose process modifications for avoiding their formation while keeping the coating quality. Numerical simulations based on 3D turbulent Navier-Stokes equations in local thermal and chemical equilibrium were carried out to understand the problem and estimate the feasibility of the proposed solutions. The computational results were supplemented by experiments for validation. A first set of investigations was focused on the location and orientation of the powder port injector. It turned out that it was not possible to keep the coating quality while avoiding lump formation by simply moving the powder injector. A new geometry of the nozzle exit was then designed and successfully tested for a first application with Ni-5Al powder used in production. 

  • 13.
    Choquet, Isabelle
    et al.
    University West, Department of Engineering Science.
    Lucquin-Desreux, Brigitte
    University Pierre and Marie Curie, Paris, France.
    Non equilibrium ionization in magnetized two-temperature thermal plasma2011In: Kinetic and Related Models, ISSN 1937-5093, E-ISSN 1937-5077, ISSN 1, Vol. 4, no 3, p. 669-700Article in journal (Refereed)
    Abstract [en]

    A thermal plasma is studied accounting for both impact ionization, and an electromagnetic field. This plasma problem is modeled based on a system of Boltzmann type transport equations. Electron-neutral collisions are assumed to be much more frequently elastic than inelastic, to complete previous investigations of thermal plasma . A viscous hydrodynamic/diffusion limit is derived in two stagesdoing an Hilbert expansion and using the  Chapman-Enskog method. The resultant viscous fluid model is characterized by two temperatures, and non equilibrium ionization. Its diffusion coefficients depend on the magnetic field, and can be computed explicitely.

  • 14.
    Choquet, Isabelle
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Wigren, J
    Deposition Rate Increase in APS Processes by Means of Multiple Injection Ports2004In: Thermal Spray 2004: Advances in Technology and Application: Proceedings of the International Thermal Spray Conference 10–12 May 2004, Osaka, Japan, 2004, p. 691-695Conference paper (Other academic)
  • 15.
    Curry, Nicholas
    et al.
    University West, Department of Engineering Science, Division of Production Engineering. University West, Department of Engineering Science, Research Enviroment Production Technology West.
    Markocsan, Nicolaie
    University West, Department of Engineering Science, Division of Production Engineering.
    Li, Xin-Hai
    Tricoire, Aurelien
    Dorfman, Mitchell
    Next Generation Thermal Barrier Coatings for the Gas Turbine Industry2010In: Proceedings of the Thermal Spray: Global Solutions for Future Application (ITSC 2010) Conference: Singapore, May 3-5, 2010, 2010, p. 716-722Conference paper (Refereed)
  • 16.
    Dahlmo, K I
    et al.
    Nobel Biocare, Göteborg.
    Andersson, M
    Gellerstedt, M
    University West, Department of Economics and IT.
    Karlsson, S
    On a new method to assess the accuracy of a CAD program.2001In: International Journal of Prosthodontics, ISSN 0893-2174, E-ISSN 1139-9791, Vol. 14, no 3, p. 276-83Article in journal (Refereed)
    Abstract [en]

    PURPOSE: This study was initiated with the purpose of developing and evaluating a system for measuring the magnitude of the variation between a computer-aided design (CAD) object created on the computer screen and a replicated object produced by computer-aided manufacturing (CAM). MATERIALS AND METHODS: Controlled geometric forms, a square and a cone, were designed in a CAD program, and measuring distances were selected. The CAD data were transmitted to CAM data, and objects were produced. The CAD/CAM process was the Procera system, and the holder system permitted the objects to be ground into cross sections, similar to the visualization in the CAD program. Five objects of each shape were produced and measured by two operators two times. Three operators measured one of the objects 30 times. RESULTS: Observed values were greater than the true value. For all objects, the systematic error was at most 15.5 microns. Interoperator difference was small. The variation because of measurement error was greater for the square object compared to the cone. However, the variation because of object was higher for the cone object than for the square. The total standard deviation was 7.7 microns. Thus, the total random error caused by object variation and measurement error was in approximately 95% of all measurements less than 15 microns. CONCLUSION: There are no differences in the measurement data derived from this method and actual measurement data from an object created by the computer-aided dental design program. The method has high validity and reliability, i.e., high accuracy.

  • 17.
    Damfelt, Christoffer
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Nilsson, Simon
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Prestandautvärdering av enkortsdatorn BPI-R1 jämfört med traditionella hemroutrar2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    In modern times IT gets a major role in people lives. More devices get connected and most familymembers have several connected devices which results in a rising utilization of the home network. Due to this we conducted this project with the intent of evaluating the single-board computer BPI-R1 to traditional home routers in order to establish whether it is applicable for common use as a home router.

    The devices was evaluated by measuring the throughput with iperf in several different scenarios. Throughput is the maximum achievable bandwidth after the traffic has been affected by various factors such as overhead.

    The devices that the BPI-R1 was compared to was a TP-link TL-WR1043WND and a Netgear WNR3500L. Iperf3 was used both to generate the traffic and to gather the results of the measurements. The tests was conducted in three steps. Basic tests on a port-to-port basis and two scenario tests. The basic tests was LAN-LAN, LAN-WAN and WIFI-LAN while scenario one was all the basic tests conducted simultaneously. Scenario two was a WAN-max test where four separate data streams were sent from different LAN-ports to the WAN-port. Iperf3 were being run on Dell Latitude E4130 for cabled traffic and a Samsung Galaxy S7 edge were used for the Wireless traffic.

    The results for the basic tests show that LAN-LAN gave similar results on all devices, on LAN-WAN the results differed vastly between the devices. On WIFI-LAN it differed but not as vastly as in LAN-WAN, and the traffic showed typical behavior of wireless transfers. Both in scenario test one and two it displayed major differences in performance between the devices as well as a major difference between scenario tests and basic tests.

  • 18.
    Danielsson, Fredrik
    et al.
    University West, Department of Technology.
    Ericsson, Mikael
    University West, Department of Technology.
    Computer Aided Robotics combined with a Finite Element Analysis for Process Simulation of Welding2004In: 35th International Symposium on Robotics, ISR 2004: Paris, mars 2004, Paris: International Federation of Robotics , 2004Conference paper (Refereed)
  • 19.
    Danielsson, Fredrik
    et al.
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Gustavsson Christiernin, Linn
    University West, Department of Engineering Science.
    An Adaptable Process Planning Tool: A Tool for Information, Communication, and Interaction in a Robot Cell2011In: ADAPTIVE 2011: the Third International Conference on Adaptive and Self-Adaptive Systems and Applications / [ed] Fox, Jorge & Rausch, Andreas, International Academy, Research and Industry Association (IARIA), 2011, p. 15-19Conference paper (Refereed)
    Abstract [en]

    This study presents work in progress on how to develop a process-planning tool to handle interaction between human operators and robots within a robot cell. First, we introduce how to include human activities in the process flow; then, we turn to our ideas for communication and feedback systems inside a robot cell. A small example of how to design interactive and re-programmable screens is presented.

  • 20.
    Dosé, Madeleine
    et al.
    University West, School of Business, Economics and IT, Division of Media and Design.
    Tedenbrant, Natalie
    University West, School of Business, Economics and IT, Division of Media and Design.
    "Spela, pausa, återuppta!": En kvantitativ studie om Netflixanvändares preferenser i strömmande serier och varför de väljer att återkomma2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay examine what Netflixs users prefer in a streamed serie and what makes them resume watching it after a break. The theoretical framework that the essay will presuppose from is convergence culture, continuity editing and narrative strategies. Convergence culture is used in this essay to view how media have converged through the interplay between media producers and users. The users nowadays are more active in their choice of media. They only consume what they find personally interesting. Streaming services such as Netflix give the users the opportunity to freely govern the way they want to consume it. What is it that makes the users stay in a serie or resume watching it when they just as simply could choose something different? In continuity editing the structure of a serie is all about lifting the story and emotions in the audience without being noticable. Narrative strategies can according to theory be used to evoke curiosity and the sense of wanting to see more. The quantitative questionnaire in this essay was answered by 67 participants and it aims to measure the users preferences in a serie as well as what makes them choose to resume watching. The questions concerned the participants user habits, whether they felt involvement in series and what narrative strategies they prefer. The results show that the participants prefer narrative questions, suggestion and story-delaying. The main reason why the participants resumed watching a serie was the desire to know what is going to happen next. The second reason was wanting to know how the series end.

  • 21.
    Edstorp, Marcus
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Eriksson, Kenneth
    University West, Department of Technology, Mathematics and Computer Science.
    Modelling and Simulation of Moving Boundaries and Convective Heat Transfer in Non-Autogenous Fusion Weld Pools using FEMLAB 3.12005In: Proceedings of the FEMLAB CONFERENCE 2005, 2005, p. 85-90Conference paper (Other academic)
  • 22.
    Emanuelsson, Andreas
    et al.
    University West, Department of Engineering Science.
    Paavilainen, Roger
    University West, Department of Engineering Science.
    Inventering och riskanalys av skolskjutshållplatser: kvalitetsäkring med avseende på trafiksäkerhet2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In Trollhättan municipality approximately 700 school bus stops are in service. To ensure high quality of the performance of school bus operations, with focus on traffic safety, it was decided to conduct a survey of bus stops including assessments of risks.

    This master thesis aims to identify the factors affecting road safety at bus stops and pedestrian connections, and to conduct an inventory and analysis of selected sites in Trollhättan municipality. The work also aims to show examples of how risk assessment should be performed in future studies. A risk analysis model provided by the Swedish Transport Administration is supplemented and used in a field study. The risk assessment is based on, inter alia, traffic flow, visibility distance, lighting, speed of traffic and the presence of bus shelter. A total number of 93 bus stops and 228 pedestrian connections are examined during the field study. The result shows that the connections are generally a larger traffic safety problem than the bus stops.

    The risk analysis model uses both objective and subjective assessments. Applying subjective assessments to supplement objective is beneficial, but there are some difficulties in making subjective judgments. Those require that the evaluator possess much knowledge and experience in traffic safety and it is difficult to always be consistent when setting subjective ratings.

    The group recommends the city of Trollhättan to proceed with field testing of bus stops and pedestrian connections, and to regularly conduct surveys of passenger’s experiences and views on safety. Furthermore it is recommended that the bus drivers carry out a risk analysis from their perspective.

    Download full text (pdf)
    FULLTEXT01
  • 23.
    Emanuelsson, Izak
    University West, Department of Engineering Science.
    Underhållsoptimering på flygplansmotorer2023Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete är en fallstudie som fokuserar på att ta fram ett förbättringsförslag som ska optimera underhållet på Jas 39 Gripen motorn, RM12. Underhållsoptimering är en väsentlig grundsten för en välfungerande underhållsverksamhet, eftersom det kan förbättra systemets prestanda, reducera kostnader och förlänga systemets livslängd. Denna fallstudie utvärderar huruvida en framtagen förbättring kan leda till en kostnadseffektivisering för underhållsverksamheten. Förbättringsförslaget implementerades och analyserades på en teoretisk nivå och resultatet presenteras för att ge grund till vidare arbete inom området.Analysen visar på att förbättringen kan leda till en optimering av underhållet och en kostnadseffektivisering. Förbättringen kräver dock en vidareutveckling innan implementering.

  • 24.
    Ericsson, Mikael
    University West, Department of Technology, Mathematics and Computer Science.
    Simulation fo Robot Paths and Heat Effects in Welding2006Doctoral thesis, comprehensive summary (Other academic)
  • 25.
    Ericsson, Mikael
    University West, Department of Technology.
    Simulation of robotic TIG-welding2003Licentiate thesis, comprehensive summary (Other academic)
  • 26.
    Ericsson, Mikael
    et al.
    University West, Department of Technology, Mathematics and Computer Science. University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Berglund, D.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science. University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Three Dimensional Simulation of Robot path, Heat Transfer and Residual Stresses of a TIG-welded Part with Complex Geometry2002In: Trends in Welding Research: Proceedings of the 6th International Conference: Phoenix, AZ, 15-19 April, 2002, 2002, p. 973-978Conference paper (Other academic)
    Abstract [en]

    In this paper a system is presented that combines a robot off-line programming software with a finite element model that predicts temperature-time histories and residual stress distributions. The objective is to develop a tool for the engineer where robot trajectories and welding process parameters can be optimized on parts with complex geometry. The system was evaluated on a stainless steel gas turbine component. Robot weld paths were defined off-line and automatically downloaded to the finite element program, where transient temperatures and residual stresses were predicted. Temperature dependent properties and phase change, were included in the analysis. Assumptions and principles behind the modeling techniques are presented together with predicted temperature histories, residual stresses, and fixture forces.

  • 27.
    Ericsson, Mikael
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Henriksson, P.
    Non-contact Temperature Measurements using an Infrared Camera in Aerospace Welding Applications2002In: 6th International Conference on Trends in Welding Research: Phoenix, AZ; 15-19 April 2002, Materials Park: ASM International , 2002, p. 930-935Conference paper (Refereed)
    Abstract [en]

    This paper describes the application of infrared (IR) thermal imaging and temperature measurements in welding applications, both on single plane plates and on an aero engine turbine component with complex geometry. Temperature profiles were measured on the plates using thermocouples (T/C) in combination with an IR camera system, and the results were compared. The IR camera was used both in line scan mode (270 Hz scan frequency) and in full frame mode (1 Hz frame rate). Different methods of surface treatments have been tested to handle the problem of the surface emissivity variations due to oxidation during welding. Results from measurements using thermocouples and IR camera is presented in the paper as well as temperature measurements using the IR camera on an turbine exhaust case (TEC) engine component.

  • 28.
    Ericsson, Mikael
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science.
    Berglund, D.
    Ling-Peng, R.
    Three dimensional simulation of robot path, heat transfer and residual stresses of a welded part with complex geometry2005In: International jourrnal for the joining of materials, ISSN 0905-6866, Vol. 17, no 2, p. 42-51Article in journal (Refereed)
    Abstract [en]

    In this article a simulation system is presented that combines computer aided robotics software used to define the welding operation, with a finite element model that predicts temperature-time histories and residual stress distributions for welding applications. The objective is to develop a tool for engineering processes in which robot trajectories and welding process parameters can be optimized off-line on parts with complex geometries. The system was evaluated on a stainless steel gas turbine component. Temperature dependent properties and phase change were included in the analysis. The turbine component was welded using an in-house TIG welding cell. The assumptions and principles that underpin the modeling techniques are presented together with predicted temperature histories, residual stresses, and fixture forces. Predicted residual stresses were compared with neutron diffraction measurements.

  • 29.
    Ericsson, Mikael
    et al.
    University West, Department of Engineering Science, Division of Automation Systems.
    Ryberg, Anders
    Nilsson, Jim
    Christiansson, Anna-Karin
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Lennartson, Bengt
    Chalmers.
    Off-Line Simulation of Advanced Stereo Vision Welding Applications2010In: Machine Vision and Applications, ISSN 0932-8092, E-ISSN 1432-1769Article in journal (Refereed)
  • 30.
    Eshagh, Mehdi
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering. Division of Geodesy, Royal Institute of Technology, Stockholm, Sweden.
    Lars E., Sjöberg
    Division of Geodesy, Royal Institute of Technology, Stockholm, Sweden.
    Ramin, Kiamehr
    Department of Geodesy and Geomatics, Zanjan University, Zanjan, Iran.
    Evaluation of robust techniques in suppressing the impact of outliers in a deformation monitoring network – A case study on the Tehran Milad tower network2007In: Acta Geodaetica et Geophysica Hungarica, ISSN 1217-8977, E-ISSN 1587-1037, Vol. 42, no 4, p. 449-463Article in journal (Refereed)
    Abstract [en]

    The problem of handling outliers in a deformation monitoring network is of special importance, because the existence of outliers may lead to false deformation parameters. One of the approaches to detect the outliers is to use robust estimators. In this case the network points are computed by such a robust method, implying that the adjustment result is resisting systematic observation errors, and, in particular, it is insensitive to gross errors and even blunders. Since there are different approaches to robust estimation, the resulting estimated networks may differ. In this article, different robust estimation methods, such as the M-estimation of Huber, the “Danish”, and the L 1-norm estimation methods, are reviewed and compared with the standard least squares method to view their potentials to detect outliers in the Tehran Milad tower deformation network. The numerical studies show that the L 1-norm is able to detect and down-weight the outliers best, so it is selected as the favourable approach, but there is a lack of uniqueness. For comparison, Baarda’s method “data snooping” can achieve similar results when the outlier magnitude of an outlier is large enough to be detected; but robust methods are faster than the sequential data snooping process.

  • 31.
    Fagerholm, Jennie
    et al.
    University West, School of Business, Economics and IT.
    Carlsson, Petter
    University West, School of Business, Economics and IT.
    Rubriker och dess digitala tillgänglighet: En kvantitativ studie sett till rubrikers färg samt bakgrundsfärg på alla Sveriges kommunwebbplatser2023Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Syftet med vår uppsats är att granska den digitala tillgängligheten sett till kontrastförhållandet mellan rubrik och bakgrund på svenska kommuners webbplatser. Den komponent i HTML som vi valt att studera i denna undersökning är elementet h2. Syftet med en h2-rubrik är vanligtvis att strukturera upp innehållet samt fungera som en underrubrik till huvudrubriken och således ge besökaren en uppfattning om sidinnehållets disposition. I Sverige är det Myndigheten för digital förvaltning (DIGG) som arbetar för att tillgängliggöra offentliga webbplatser. Det är till deras regler och rekommendationer utvecklare till offentliga webbplatser måste förhålla sig. Införandet av lagen om tillgänglighet till digital offentlig service (DOS) 2018 ökade kraven på offentliga aktörer i Sverige (SFS 2018: 1937, § 4). DOS-lagen bygger på Web Content Accessibility Guidelines (WCAG) som utvecklats av World Wide Web Consortium (W3C) för att främja social inkludering (W3C, 2018). WCAG:s kriterier är indelade i tre nivåer om A, AA och AAA. Contrast ratio, eller kontrastvärde, är ett värde på mellan 0–21 i detta falloch representerar hur bra kontrast det är mellan rubrik och bakgrund. Då vi eftersträvar en generell bild av kommunwebbplatsernas digitala tillgänglighet har vi valt att göra en kvantitativ innehållsanalys. Vi kommer manuellt gå in i källkoden för varje kommuns startsida och leta reda på det första h2-elementet från toppen och neråt. Resultatet visar att hela 99,66 % av Sveriges kommuner ligger på minst nivå AA vilket är ett krav, kontrastmässigt, enligt WCAG. Vi ser ett ordentligt spann mellan lägsta kontrastvärdet på 2,77 och högsta kontrastvärdet på 21 bland Sveriges alla kommuner.

  • 32.
    Fasth, Angelica
    et al.
    University West, Department of Engineering Science.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Markocsan, Nicolaie
    University West, Department of Engineering Science.
    Musalek, Radek
    Characterization of thermo-mechanical properties for thermal sprayed NiCoCrAlY coatings2010In: Proceedings of the Thermal Spray: Global Solutions for Future Application (ITSC 2010) Conference: Singapore, May 3-5, 2010, 2010, p. 431-435Conference paper (Refereed)
  • 33.
    Franzén, Mathias
    University West, Department of Engineering Science.
    Skapa ett framgångsrikt förbättringsarbete på AKzo Nobel Surface Chemistry i Stenungsund2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Dagens omgivning är full av osäkerhet, marknadssvängningar, geografiska förändringar i arbetskraft och den högteknologiska utvecklingen vilket utsätter nutidens organisationer för ständiga förändringar (Savery och Luks 2000). Detta innebär att företag på 2000-talet, genom att systematiskt förbättra verksamheten, oavbrutet måste hålla ner kvalitetsbristkostnader, minimera förluster och öka produktiviteten för att kunna bevara sin position på marknaden (Baghel, Bhuiyan och Wilson, 2005).

    I denna studie var syftet att skapa ett nytt arbetssätt och struktur för ett framgångsrikt förbättringsarbete på Akzo Nobel Surface Chemistry Stenungsund. Studien bestod dels av ett teoriavsnitt med en litteraturstudie utifrån nutida forskning och även en kvalitativ undersökning genom djupgående intervjuer med 19 medarbetare från olika ansvarsnivåer och via en enkätundersökning som gick ut till resterande medarbetare.

    Akzo Nobel Surface Chemistry är en del av Akzo Nobel koncernen som är en av världens ledande färgtillverkare. Koncernen har över 55 000 anställda i över 80 länder där ungefär 3600 anställda arbetar på ett 20-tal platser runt om i Sverige. Företaget bedriver förbättringsarbete genom daglig uppföljning ute i fabrikerna och på respektive avdelning. Dessutom samlas alla förbättringsförslag upp i en databas och en utvald styrgrupp analyserar och prioriterar dessa. Problemet är dock att det saknas struktur och systematik för hur förbättringsförslag och actionpunkter ska gå från idéer, till att genomföras och följas upp för att kunna driva igenom förbättringar.

    I detta projekt togs det fram en modell för hur företaget kan skapa förutsättningar för ettframgångsrikt förbättringsarbete genom att skapa en kreativ miljö för medarbetarna att arbeta i. Vidare poängterades vikten av att ledningen fokuserar på att generera kvalitet hos medarbetarna genom att fokusera på kärnvärden och emotionell kompetens. Därefter presenterades framtagen struktur med arbetssätt för att minimera ledtiden från förslag till genomförande och återkoppla detta genom givna forum och system. Vidare föreslogs att ledningen ska förbereda organisationen på att ett nytt förbättringsarbete är på väg och förklara varför detta är väsentligt för företagets framtida överlevnad. Detta kan skapa förutsättningar för att implementera förbättringsarbetet på ett framgångsrikt sätt med en positiv effekt på medarbetarna.

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    Examensarbete Mathias Franzen
  • 34.
    Fuentes Martinez, Ana
    University West, School of Business, Economics and IT, Division of Media and Design.
    Introduktion till programmering2021In: Introduktion till medieteknik / [ed] Pernilla Falkenberg Josefsson, Mikael Wiberg, Studentlitteratur AB, 2021, 1:1, p. 217-225Chapter in book (Other academic)
  • 35.
    Gustavsson Christiernin, Linn
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Flexibla robotceller inom fordonsindustrin: Men hur ska informationsutbytet och interaktionen ske?2012In: Fordonskomponenten, ISSN 2000-7299, no 4, p. 26-28Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    En stor del av bilproduktionsprocessen är automatiserad. Ett fordons alla delar passerar flera olika stationer eller celler för att justeras och installeras, och robotar och människor har olika,vanligtvis separerade, uppgifter. Ett problem med denna typ av automatiserade produktion är den tid som det tar att vidta ändringar och frånvaron av medel hos den mänskliga operatören att kommunicera och interagera med roboten på ett flexibelt vis.

  • 36.
    Gustavsson Christiernin, Linn
    et al.
    University West, Department of Engineering Science, Division of Production Systems.
    Hartler, Johan
    Department of Shipping and Marine Technology Chalmers Technical University Gothenburg, Sweden.
    Multi-Layered Design and Game-Based Learning as a Pedagogical Concept: How to develop proper behavior in ARPA simulator training2016Conference paper (Refereed)
    Abstract [en]

    To become a professional master mariner one has to develop many different skills and have an understanding of how to act in different situations on the bridge. Within the master mariner program at Chalmers University of Technology, Sweden, simulation technologies are used to evolve pertinent skills within the educational program. A challenge with using a full scale simulator from the outset of the program is to get the students to develop both professional competencies and internalize tacit knowledge in the navigation of a ship when the interface of the simulator itself is quite demanding. By using an adaptive Multi-Layered Design approach in combination with game based learning, this paper proposes how to guide the student through a more summative learning process. The main idea is to grant limited access to what the students can do with some functions, and gradually turn on more functionality in order to develop certain experienced behaviors to get them to understand the logical approach behind selections and to make them think through why and when they should do things.

  • 37.
    Gustavsson, Linn
    et al.
    University West, School of Business, Economics and IT, Division of Urban Planing and Development.
    Vallo Hult, Helena
    University West, School of Business, Economics and IT, Divison of Informatics. NU Hospital Group, Trolhättan (SWE).
    Winman, Thomas
    University West, School of Business, Economics and IT, Divison of Informatics.
    Ahlström, Petter
    University West, School of Business, Economics and IT, Division of Urban Planing and Development.
    From classroom education to work-integrated learning in the forest - students and teachers as knowledge co-creators in hybrid learning spaces2022Conference paper (Other academic)
  • 38.
    Hagqvist, Petter
    et al.
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Sikström, Fredrik
    University West, Department of Engineering Science, Division of Electrical and Automation Engineering.
    Christiansson, Anna-Karin
    University West, Department of Engineering Science, Division of Electrical and Automation Engineering.
    Emissivity estimation for high temperature radiation pyrometry on Ti–6Al–4V2013In: Measurement, ISSN 0263-2241, E-ISSN 1873-412X, Vol. 46, no 2, p. 871-880Article in journal (Refereed)
    Abstract [en]

    The paper demonstrates a versatile procedure suitable for industrial implementation of temperature measurement on a hot titanium alloy. The driving force has been the need for an accurate temperature measurement during additive manufacturing using laser welding technology where Ti–6Al–4V-wire is melted. The challenges consider both industrial constraints and the varying emissivity of the surface. Measurements makes use of a narrow bandwidth spot radiation pyrometer and a calibration procedure for estimation of the surface temperature through spectral emissivity estimation. The theoretical results are validated through experiments. A number of difficulties in radiation temperature measurements for metals with varying surface properties are discussed; especially the case of surface oxidation. The uncertainty in temperature reading due to the uncertainty in the emissivity estimate is established along with a model that qualitatively describes surface oxidation. The procedure is expected to be useful for several manufacturing applications where it is important to control high temperatures.

  • 39.
    Haj-Bolouri, Amir
    et al.
    University West, School of Business, Economics and IT, Divison of Informatics.
    Rossi, Matti
    Information Systems, Aalto University, Espoo (FIN).
    Towards Design Principles for Safety Training in Virtual Reality: An Action Design Research Case2021In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 12807 LNCS, p. 89-95Article in journal (Refereed)
    Abstract [en]

    Virtual Reality (VR) technology has progressed and become viable for the purpose of education, learning, and training. Organizations adopt and employ VR technologies to enhance employees' skills, competency, and readiness through safety training that prepare the employees towards work-specific situations that are dangerous, hazardous, and uncertain. This research in progress paper reports early results from an Action Design Research case on VR safety training. The empirical work of this study is on-going and is set in the domain of rail industry. Early results are reported as tentative design implications for safety training in VR, which are based on a first round of data analysis. The implications are proposed with the ambition of extending them into design principles for safety training in VR. Subsequently, steps for future research are outlined and discussed to advance the design implications into principles.

  • 40.
    Hatefipour, Saeid
    et al.
    University West, Department of Engineering Science, Division of Automation Systems. saeid@termisk.se.
    Ahlberg, Jörgen
    Linköping University.
    Wren, Joakim
    University West, Department of Engineering Science, Division of Automation Systems.
    Runnemalm, Anna
    University West, Department of Engineering Science, Division of Automation Systems.
    Thermal non-destructive testing: modeling, simulation and experiments for improved localization of hidden defects2014In: The 12th International Conference on Quantitative Infrared Thermography, 2014, p. 1-8Conference paper (Refereed)
    Abstract [en]

    During the last decades, a substantial amount of research and practical work has been conducted on non-destructive testing of materials using thermography. The performed studies elucidate the potential of various types of thermal non-destructive testing (TNDT) for different materials and applications, including various types of defects. This paper presents a method for detecting in-depth defects in metallic materials and a simulation model for the heat transfer in the material. Experiments are performed on a test specimen with artificial defects (flat-bottom holes). The detection method exploits spatiotemporal analysis in order to find deviations from a model of normality, and shows novel results. Thermal modelling is performed in order to have a base-line simulation model enable us to (a) investigate affecting parameters without repeating the experiments and (b) generalize the results and extend their validity to other cases. Results show that there is an acceptable compliance between simulated and measured thermal data. 

    Download full text (pdf)
    Final-QIRT-A8877SH
  • 41.
    Islind, Anna Sigridur
    et al.
    University West, School of Business, Economics and IT, Divison of Informatics.
    Lundh Snis, Ulrika
    University West, School of Business, Economics and IT, Divison of Informatics.
    Learning in home care: a digital artifact as a designated boundary object-in-use2017In: Journal of Workplace Learning, ISSN 1366-5626, E-ISSN 1758-7859, Vol. 29, no 7-8, p. 577-587Article in journal (Refereed)
    Abstract [en]

    Purpose: The aim of this paper is to understand how the role of an mHealth artifact plays out in home care settings. An mHealth artifact, in terms of a mobile app, was tested to see how the quality of home care work practice was enhanced and changed. The research question is: In what ways does an mHealth artifact re-shape a home care practice and how does this affect the interaction between caregivers and the elderly and learning opportunities for the caregivers? Design/methodology/approach: An action research approach was taken and the study was conducted in a home care organization in a Swedish municipality. The data were collected through semi-structured interviews and observations that were conducted during home visits. Concepts of learning and boundary objects were used to analyze and distinguish interactions and conversations with the mHealth artifact. Findings: The study shows how an mHealth artifact is re-shaping a home care practice and how this affects interactions and identifies learning opportunities. Views on the mHealth artifact as a designated boundary object as well as a boundary object-in-use must co-exist. Originality/value: The study provides qualitative descriptions from using an mHealth artifact for home care, which is an emerging area of concern for both research and practice. It focuses on the interactional and organizational values generated from the actual use of the designed mobile application. © 2017, © Emerald Publishing Limited.

  • 42.
    Jalo Olsson, Sara
    et al.
    University West, Department of Engineering Science.
    Wulkan, Martin
    University West, Department of Engineering Science.
    Förbättringsförslag till avemballeringsfixtur och materialhantering2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport behandlar förbättringsförslag samt åtgärdsförslag för en avemballeringsfixtur och materialhantering. Avemballeringsfixturen används för att separera ett plåtparti från pall när plåtpartiet ska lastas in till Swegons automatlager. Vid projektets start framkom det att avemballeringsfixturen inte hade genomgått en riskanalys. Detta medför en ökad risk för olycksfall då operatörerna utför sitt arbete. Det framgick även att det inte fanns några arbetsinstruktioner tillgängliga för operatörerna. Saknaden av arbetsinstruktioner gör att operatörerna inte utför arbetsmomenten på ett optimalt sätt.

    Målet med projektet var att lokalisera riskerna med avemballeringsfixturen och materialhanteringen och ge förslag på åtgärder som minimerar/eliminerar dessa. Detta gjordes genom att ta fram lösningar för ombyggnation av befintlig avemballeringsfixtur och att presentera lösningar för en säkrare materialhantering.

    Efter genomförd feleffektsanalys och arbetsmiljöanalys togs ett flertal åtgärdsförslag fram. Huvudområdena som åtgärdsförslagen berör är fixturens konstruktion, avemballeringsfixturens helhet samt operatörernas arbetsområde. De olika åtgärderna inom respektive huvudområde fokuserades på att öka operatörernas och medarbetarnas säkerhet samt att åtgärdsförslagen ska göra operatörernas arbetsmoment lättare och smidigare. Åtgärdsförslagen har i denna rapport diskuterats för att förutsäga vilken effekt de kommer att ge i form av en säkrare arbetsmiljö för operatörerna och medarbetarna.

  • 43.
    Jasem, Malek
    et al.
    University West, Department of Engineering Science.
    Norland, Johanna
    University West, Department of Engineering Science.
    Sustainability of Wire Arc Additive Manufacturing using Inconel 6252022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Wire Arc Additive Manufacturing (WAAM) is a manufacturing process used to 3D print parts or for localized repair of the metallic components. WAAM utilizes a metal wire as feedstock and an electric arc as an energy source for melting. The arc fuses the wire as it’s deposited layer on top of layer by a welding robot. The interest in WAAM has increased inrecent years thanks to its many benefits. Cost reduction, ability to build large metal components, reducing the number of stages of production, lead time reduction as well as increasing the freedom and flexibility of product design [1].The purpose of this study was to analyse the environmental impact of WAAM-process in terms of energy use and CO2 footprint. This includes an overview of AM techniques involving metals and a quantitative life-cycle investigation of the superalloy Inconel 625.The results from the conducted experiments show that the environmental impact is dependent on the geometrical building strategy. Most of the energy use and CO2 footprint occurs due to extraction and production of material resources necessary for manufacturing.The use of Argon protection gas also contributes significantly. The welding system itself does, however add relatively little to the energy use and CO2 footprint, especially if a Swedish or Nordic energy mix is used. Some of the benefits of using WAAM are waste reduction and light weighting. The use of WAAM therefore provides opportunities of sustainable developments and advancement compared to traditional manufacturing.  

  • 44.
    Jiang, Janna
    University West, Department of Engineering Science, Division of Production Engineering.
    Modelling of mechanical properties of MAX-phase materials2009Licentiate thesis, comprehensive summary (Other academic)
  • 45.
    Johansson, Lars-Olof
    et al.
    Halmstad University, Halmstad.
    Lundh Snis, Ulrika
    University West, School of Business, Economics and IT, Divison of Informatics.
    Dynamics in a innovation boundary context: exploring an living lab process from a community of practice perspective2011In: Proceedings of OLKC 2011, Organisational Learning Knowledge Capabilities Conference, Hull, England, UK., OKLC , 2011, p. 1-15Conference paper (Refereed)
    Abstract [en]

    This paper is based on a living lab process, which is an open, user-centric, innovation approach, where several actors from industry, user groups and academia are involved. The research question is: How can a boundary context, such as a living lab process, be nderstood and facilitated from a community of practice perspective? We aim to describe and analyze the dynamics in an innovation boundary context based on a living lab process. An an action-oriented research approach was applied and the empirical results are from The Find Project (TFP), with the aim of customizing an ICT product based on the needs of a user group. The findings are analyzed from a community of practice perspective where the three different communities i) researchers from Halmstad Living Lab (HLL), ii) ICT developers (ICTD), and iii) next of kin's to demented elderly persons (NOKD) represented the unit of analysis. The analysis indicates several boundary situations that played a vital role for the innovation process. The contribution of our research to innovation theory is a process model describing the dynamics in an innovation boundary context with regard to boundary objects-in-use as well as brokering. The process highlights two different levels of brokering: i) inner-level brokering; and ii) outer-level brokering.

  • 46.
    Johansson, Lars-Olof
    et al.
    Halmstad University, Halmstad.
    Lundh Snis, Ulrika
    University West, Department of Economics and IT, Divison of Informatics.
    Svensson, Lars
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Dynamics in an innovation boundary context: exploring a living labprocess from a community of practice perspective2011In: Proceedings of IRIS 2011: TUCS Lecture NotesNo 15, October 2011 / [ed] Leino, Timo, Turku: Turku Centre for Computer Science , 2011, p. 1-Conference paper (Refereed)
    Abstract [en]

    This paper is based on studies of a living lab process, which is an open, user-centric, innovation approach, where several actors from industry, user groups and academia are involved. We aim to describe and analyze the dynamics in an innovation boundary context based on a living lab process. An action-oriented research approach was applied and the empirical results are from The Find Project (TFP), with the aim of customizing an ICT product based on the needs of a user group. The findings are analyzed from a community of practice perspective where the three different communities i) researchers from Halmstad Living Lab (HLL), ii) ICT developers (ICTD), and iii) next of kin's to demented elderly persons (NOKD) represented the units of analysis. The analysis identified several boundary situations that played a vital role for the innovation process. The contribution of our research to innovation theory is a process model describing the dynamics in an innovation boundary context with regard to boundary objects-in-use as well as to brokering. The research highlights two different levels of brokering: i) product/service brokering; and ii) process brokering.

  • 47.
    Karlsson, Charlie
    et al.
    University West, School of Business, Economics and IT, Divison of Law, Economics, Statistics and Politics.
    Nyström, Kristina
    RATIO, Stockholm.
    Exit and Entry over the Product Life Cycle: Evidence from the Swedish Manufactur­ing In­dustry2003In: Small Business Economics, ISSN 0921-898X, E-ISSN 1573-0913, Vol. 21, no 2, p. 135-144Article in journal (Refereed)
    Abstract [en]

    In this paper the process of exit and entry of firms in the Swedish manufacturing industry is investigated within the framework of the product life cycle. The product life cycle theory explains how the high degree of uncertainty, as regards product designs and production methods, which is connected to the early stages of the product life cycle requires a high level of knowledge-intensity. Since uncertainty decrease over the product life cycle, less knowledge is needed in production during later stages of the product life cycle. This implies that knowledge-intensity differs for firms that exit and enter in different stages of the product life cycle. Four hypotheses regarding these relationships are stated and empirically tested in this paper, using data at the 5-digit SIC-level for the Swedish manufacturing industry during 1990–1996. The empirical results show that entrants in the early stages of the product life cycle are more knowledge-intensive than incumbent firms. It is also found that firms exiting in early stages of the product life cycle are more knowledge-intensive than firms exiting in later stages.

  • 48.
    Khorram-Manesh, Amir
    et al.
    Unit of Security and Preparedness, Former Prehospital and Disaster Medicine Center,Gothenburg,Sweden.
    Berlin, Johan
    University West, Department of Social and Behavioural Studies.
    Ljung Roseke, Lina
    Psychology Unit, Närhälsan, Borås, Sweden.
    Aremyr, Johan
    Unit of Security and Preparedness, Former Prehospital and Disaster Medicine Center,Gothenburg,Sweden.
    Sörensson, Josef
    Unit of Security and Preparedness,Former Prehospital and Disaster Medicine Center,Gothenburg,Sweden.
    Carlström, Eric
    Unit of Security and Preparedness, Former Prehospital and Disaster Medicine Center,Gothenburg,Sweden.
    Emergency Management and Preparedness Training for Youth (EMPTY): The Results of the First Swedish Pilot Study2018In: Disaster Medicine and Public Health Preparedness, ISSN 1935-7893, E-ISSN 1938-744X, Vol. 12, no 6, p. 685-688Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: To examine the impact of a simulation training in raising a group of young students' personal and situational awareness in disasters and emergencies.

    METHODS: In total, 25 young students participated in two simulation scenarios representing two actual events, fire, and shooting, using a combination of two validated simulation training (Emergency Management and Preparedness Training for Youth [EMPTY]). The changes in their knowledge and awareness were evaluated by using questionnaires and the whole simulation was evaluated by three independent observers and a reference group.

    RESULTS: New concepts of emergency management, for example, evacuation, and barricading, could be trained in a safe environment. There was a significant increase in students' personal and situational awareness and their active engagement in the management of emergencies.

    CONCLUSION: EMPTY could raise the youth basic knowledge and ability to understand the concept of preparedness by being mentally prepared, available for collaboration, gaining a higher confidence, understanding the physical and psychological consequences of a major incident and the importance of their own safety. (Disaster Med Public Health Preparedness. 2018; page 1 of 4).

  • 49.
    Mahbuby, Hany
    et al.
    Faculty of Geodesy and Geomatics Engineering, K.N. Toosi University of Technology, Tehran (IRN).
    Amerian, Yazdan
    Faculty of Geodesy and Geomatics Engineering, K.N. Toosi University of Technology, Tehran (IRN).
    Nikoofard, Amirhossein
    Faculty of Electrical Engineering, K.N. Toosi University of Technology, Tehran (IRN).
    Eshagh, Mehdi
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Application of the nonlinear optimisation in regional gravity field modelling using spherical radial base functions2021In: Studia Geophysica et Geodaetica, ISSN 0039-3169, E-ISSN 1573-1626, Vol. 65, no 3-4, p. 261-290Article in journal (Refereed)
    Abstract [en]

    The gravity field is a signature of the mass distribution and interior structure of the Earth, in addition to all its geodetic applications especially geoid determination and vertical datum unification. Determination of a regional gravity field model is an important subject and needs to be investigated and developed. Here, the spherical radial basis functions (SBFs) are applied in two scenarios for this purpose: interpolating the gravity anomalies and solving the fundamental equation of physical geodesy for geoid or disturbing potential determination, which has the possibility of being verified by the Global Navigation Satellite Systems (GNSS)/levelling data. Proper selections of the number of SBFs and optimal location of the applied SBFs are important factors to increase the accuracy of estimation. In this study, the gravity anomaly interpolation based on the SBFs is performed by Gauss-Newton optimisation with truncated singular value decomposition, and a Quasi-Newton method based on line search to solve the minimisation problems with a small number of iterations is developed. In order to solve the fundamental equation of physical geodesy by the SBFs, the truncated Newton optimisation is applied as the Hessian matrix of the objective function is not always positive definite. These two scenarios are applied on the terrestrial free-air gravity anomalies over the topographically rough area of Auvergne. The obtained accuracy for the interpolated gravity anomaly model is 1.7 mGal with the number of point-masses about 30% of the number of observations, and 1.5 mGal in the second scenario where the number of used kernels is also 30%. These accuracies are root mean square errors (RMSE) of the differences between predicted and observed gravity anomalies at check points. Moreover, utilising the optimal constructed model from the second scenario, the RMSE of 9 cm is achieved for the differences between the gravimetric height anomalies derived from the model and the geometric height anomalies from GNSS/levelling points. © 2021, The Authors.

    Download full text (pdf)
    Springer
  • 50.
    Markocsan, Nicolaie
    University West, Department of Engineering Science.
    Recent developments in coatings for gas turbines - TBC´s and other advanced coatings.2009In: Advanced in Surface Engineering Seminar: University of Techology, Tampere Finland, 19-23 Oktober, 2009Conference paper (Other academic)
12 1 - 50 of 71
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