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  • 251.
    Asnafi, Nader
    et al.
    Örebro University, School of Science and Technology.
    Rajalampi, Jukka
    Aspenberg, David
    DYNAmore Nordic AB, Linköping, Sweden.
    Alveflo, Anton
    Automotive Stamping Tools & Dies and Injection Mold made by Additive Manufacturing through Laser-based Powder Bed Fusion2019In: Metal Additive Manufacturing Conference: Industrial Perspectives in Additive Technologies, 2019Conference paper (Refereed)
    Abstract [en]

    Design and production of tools, dies and moulds are two important steps in the development of new components/products. These steps determine both the lead time (Time-To-Production/-Market) and the size of the investments required to start the production. This paper deals with design and production of stamping tools & dies for sheet metal components and injection moulds for plastic components. Laser-based Powder Bed Fusion (LPBF) is the additive manufacturing (henceforth even called 3D printing) method used in this investigation.

    The stamping tools & dies should withstand the requirements set in stamping of hot-dip galvanized DP600. Solid and topology optimized forming and cutting/blanking/trimming tools made in maraging steel (DIN 1.2709) by LPBF are approved/certified for stamping of 2 mm thick DP600. A working station in a progressive die used for stamping of 1 mm thick DP600 is 3D-printed in DIN 1.2709, both with a honeycomb inner structure and after topology optimization, with successful results. 3D printing results in a significant lead time reduction and improved tool material efficiency. The cost for 3D-printed stamping tools and dies is somewhat higher than the cost of those made conventionally. DIN 1.2709 is certified in this study as tool material for stamping of hot-dip galvanized DP600.

    The core (inserts) of an injection mould is 3D-printed in DIN 1.2709, conformal cooling optimized and 3D-printed in Uddeholm AM Corrax, and compared with the same core made conventionally. Additive manufacturing results in localized tool production and lower total costs. The cooling and cycle time can be improved significantly, if the injection moulding core (inserts) is optimized and 3D-printed in Uddeholm AM Corrax. The best results are obtained, if the 3D-printed core is NOT only an optimized copy of the conventionally designed and manufactured version. The best results are obtained, if the core is redesigned to utilize the full potential of 3D printing.

    This paper accounts for the results obtained in the above-mentioned investigations.

  • 252.
    Asnafi, Nader
    et al.
    Örebro University, School of Science and Technology.
    Rajalampi, Jukka
    RISE IVF, Olofström, Sweden.
    Aspenberg, David
    DYNAmore Nordic, Linköping, Sweden.
    Alveflo, Anton
    Voestalpine High Performance Metals, Mölndal, Sweden.
    Production Tools Made by Additive Manufacturing Through Laser-based Powder Bed Fusion2020In: Berg- und Huttenmännische Monatshefte (BHM), ISSN 0005-8912, E-ISSN 1613-7531, Vol. 165, no (3), p. 125-136Article in journal (Refereed)
    Abstract [en]

    This paper deals with the design and production of stamping tools and dies for sheet metal components and injection molds for plastic components. Laser-based Powder Bed Fusion (LPBF) is the additive manufacturing method used in this investigation. Solid and topology optimized stamping tools and dies 3D-printed in DIN 1.2709 (maraging steel) by LPBF are approved/certified for stamping of up to 2‑mm thick hot-dip galvanized DP600 (dual-phase steel sheet). The punch in a working station in a progressive die used for stamping of 1‑mm thick hot-dip galvanized DP600 is 3D-printed in DIN 1.2709, both with a honeycomb inner structure and after topology optimization, with successful results. 3D printing results in a significant lead time reduction and improved tool material efficiency. The cost of 3D-printed stamping tools and dies is higher than the cost of those made conventionally. The core (inserts) of an injection mold is 3D-printed in DIN 1.2709, conformal cooling optimized and 3D-printed in Uddeholm AM Corrax, and compared with the same core made conventionally. The cooling and cycle time can be improved, if the injection molding core (inserts) is optimized and 3D-printed in Uddeholm AM Corrax. This paper accounts for the results obtained in the above-mentioned investigations.

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    Production Tools Made by Additive Manufacturing Through Laser-based Powder Bed Fusion
  • 253.
    Asnafi, Nader
    et al.
    Örebro University, School of Science and Technology.
    Shams, Tawfiq
    Örebro University, Örebro University School of Business.
    Aspenberg, David
    DYNAmore Nordic AB, Linköping, Sweden.
    Öberg, Christina
    Örebro University, Örebro University School of Business.
    3D Metal Printing from an Industrial Perspective: Product Design, Production and Business Models2018In: Metal Additive Manufacturing Conference 2018 Proceedings: Industrial perspectives in Additive Technologies, Vienna, Austria: ASMET , 2018, p. 304-313Conference paper (Refereed)
    Abstract [en]

    This paper is focused on automotive stamping tools and dies and the impact of 3D metal printing and metals related 3D printing on design and production of such tools and dies. The purpose has been to find out the current industrial potential of 3D printing, as far lead time, costs, shapes, material usage, metal piece size, surface roughness, hardness, strength, and machinability are concerned. The business transformational impact of 3D printing is also addressed in this paper. The obtained results show that the lead time can be halved, the costs are somewhat higher, and the strength, hardness, surface roughness and machinability of the 3D printed metallic tools and dies are as good as those of the conventionally made. The maximum size of a metal piece that can be 3D printed today by Powder Bed Fusion (PBF) is in the best case 500 mm x 500 mm x 500 mm. 3D printing can also be used to make the pattern used to make the mold box in iron and steel casting. It is also possible to eliminate the casting pattern, since the mold box can be 3D printed directly. All this has started to have a large business impact and it is therefore of great significance to outline and execute an action plan almost immediately.

  • 254.
    Asnafi, Nader
    et al.
    Örebro University, School of Science and Technology.
    Shams, Tawfiq
    Örebro University, Örebro University School of Business.
    Aspenberg, David
    DYNAmore Nordic AB, Linköping, Sweden.
    Öberg, Christina
    Örebro University, Örebro University School of Business.
    3D Metal Printing from an Industrial Perspective: Product Design, Production, and Business Models2019In: Berg- und Huttenmännische Monatshefte (BHM), ISSN 0005-8912, E-ISSN 1613-7531, Vol. 164, no 3, p. 91-100Article in journal (Refereed)
    Abstract [en]

    This paper is focused on automotive stamping tools and dies as well as the impact of 3D metal printing and metals related 3D-printing on design and production of such tools and dies. The purpose has been to find out the current industrial potential of 3D-printing as far as lead time, costs, shapes, material usage, metal piece size, surface roughness, hardness, strength, and machinability are concerned. The business transformational impact of 3D-printing is also addressed in this paper. The obtained results show that the lead time can be halved, the costs are somewhat higher, and the strength, hardness, surface roughness, and machinability of the 3D-printed metallic tools and dies are as good as those of the conventionally made. The maximum size of a metal piece that can be 3D-printed today by Powder Bed Fusion (PBF) is, in the best case, 500 mm × 500 mm × 500 mm. 3D-printing can also be used for the pattern to make the mold box in iron and steel casting. It is also possible to eliminate the casting pattern, since the mold box can be 3D-printed directly. All this has started to have a large business impact, and it is therefore of great significance to outline and execute an action plan almost immediately.

  • 255.
    Asnafi, Nader
    et al.
    Volvo Car Components Corp./I., Olofström, Sweden.
    Skogsgårdh, A.
    Volvo Car Components Corp./I., Olofström, Sweden.
    Theoretical and experimental analysis of stroke-controlled tube hydroforming2000In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 279, no 1-2, p. 95-110Article in journal (Refereed)
    Abstract [en]

    To select tube hydroforming instead of conventional fabrication, one has to know the tube material behaviour and tribological effects during hydroforming and how the hydroforming operation itself should be controlled. The hydroforming operation is either force- or stroke-controlled. This paper deals with stroke-controlled hydroforming. Hydroforming consists of free forming and calibration. In this paper, only the so-called free forming is treated. Stroke-controlled free forming is studied theoretically and experimentally. The theoretical part consists of analytical modeling and finite-element simulations. The conducted experiments are used to show the types of errors that might occur, when the theoretically obtained loading paths are transferred to the hydroforming equipment. The forming limit curve (FLC) is normally used as an aid/instrument in component and process design (which include finite-element simulations). The present study shows that the FLC of the tube material must be determined by hydroforming, if component and process design are to rely on this instrument.

  • 256.
    Asnafi, Nader
    et al.
    Sapa Technology, Finspång (and Vetlanda), Sweden .
    Skogsgårdh, Anders
    Skåre, Thomas
    Hydroforming av rörformiga komponenter: teori och praktik2000Conference paper (Other academic)
  • 257.
    Asnafi, Nader
    et al.
    Industrial Development Center/Volvo Cars Body Components, Olofström, Sweden .
    Skogsgårdh, Anders
    Östergren, Nicklas
    Sjöstedt, Jörgen
    HYFO98: Slutrapport1998Report (Other academic)
  • 258.
    Asnafi, Nader
    et al.
    Sapa Technology, Finspång (and Vetlanda), Sweden .
    Widlund, Conny
    Håltagning vid hydroformning: material- och processparametrars inverkan på hålkvaliteten2000Report (Other academic)
  • 259.
    Aspenberg, David
    et al.
    DYNAmore Nordic AB, Linköping, Sweden.
    Asnafi, Nader
    Örebro University, School of Science and Technology.
    Topology optimization of a U-bend tool using LS-TaSC2019In: Proc. of the 12th European LS-DYNA Conference 2019, 2019Conference paper (Refereed)
    Abstract [en]

    Metal additive manufacturing of stamping tool and die has a potential of reducing the lead time of forming processes, while at least not increasing the cost. As a part of a research project exploring the possibilities to use this type of tool manufacturing techniques, topology optimization using LS-TaSC has been utilized and one example case is presented in this paper, namely a U‑bend tool. This paper looks at the possible benefits from using nonlinear simulations in topology optimization, the effect of chosen target mass fraction value, the interpretations needed of optimal results and the effects on the formed specimen after using an optimized tool. Results show that accounting for the time dependent pressure on the tool, rather than applying a form of equivalent static load, gives a different optimal topology. Some manual interpretations of the optimal results are also recommended, as well as studying the effects on the specimen from removing material on the tool side.

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    Topology Optimization of a U-Bend Tool using LS-TaSC
  • 260.
    Ata'a, A.W.
    et al.
    University of Baghdad, Baghdad, Baghdad, Iraq.
    Abdullah, S.N.
    Electronic and Communication Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq.
    Deinterleaving of radar signals and PRF identification algorithms2007In: IET radar, sonar & navigation, ISSN 1751-8784, E-ISSN 1751-8792, Vol. 1, no 5, p. 340-347Article in journal (Refereed)
    Abstract [en]

    Electronic warfare (EW) receivers are passive receivers which receive emissions from other platforms, and do certain analysis on these emissions. Some EW receivers receive radar pulses, measure the parameter of each pulse received and group the pulses that belongs to the same emitter together to determine the radar parameters for each emitter. These parameters are then compared with values stored for known radar types, to identify the emitter type. Two parts are focused, emitters deinterleaving and PRF-type identification. The deinterleaving is done through parameters clustering. Two parameters are selected for clustering direction of arrival and radio frequency. A self-organising neural network called Fuzzy ART is proposed for clustering. This algorithm has a very good clustering quality and can run in real-time applications. The PRF-type identification is done through time-of-arrival (TOA) analysis. Three previously presented algorithms are combined in new scheme to do the TOA analysis (or PRF-type identification). These algorithms are difference TOA histogram, TOA folding histogram and sequence search algorithm. The complete proposed system has been tested using three different tests. These tests are simple PRI test, jittered PRI test and staggered PRI test. The proposed system identifies up to 90 simple emitters, 20 jittered emitters and 20 staggered emitters. In all tests, the data were simulated and generated using software.

  • 261.
    Atterling, Lise-Lotte
    Örebro University, School of Science and Technology.
    TAK-mätning slipmaskiner2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today's Suzuki Garphyttan AB (SG) part of the Suzuki Metal Industry Group. Which is a Japanese company. SG is a world leader in the manufacturing of advanced spring wire used for various automotive applications. The core business of SG is the manufacturing and sales of valve spring wire, flat wire and profiled wire, oil quenched wire, spring wire, and stainless steel spring wire.  SG has its own manufacturing of valve springs for trucks in the Springshop. It´s located within the SG factory area. Springshop implements an improvement with the intention to changes todays functional production to line production. The customers require quality certifications and some customers have themselves wound up its quality control on for spring. The quality control and quality guarantee is then responsible for spring production. This means even higher quality and reliability of the manufacturers. Springshop improvement work to restructure from even higher quality and reliability of the manufacturers.  From the OEE-analysis of grinders machine available data and information on the reasons for include machine downtime. Through the analysis of the measurement results are obtained for the continued improvement of the grinding machine increase utilization and thus secure future production volumes.  The project undertaken was OEE-analysis of grinding machines and it has worked out well. The results that come up have led to what has previously been indications to low utilization now has been measured and documented.  Recommendation to SG is to work with preventive maintenance to have a uneven get a smoother production, a custom orders to the grinders operator are allocated to plots the day before. Order shall be within a reasonable production capacity and with the utmost focus on quality.

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    fulltext
  • 262.
    Ayoub, M. W. Ben
    et al.
    CETIAT, Villeurbanne, France; Aix Marseille Univ, Marseille, France.
    Aro, Rudolf
    CETIAT, Villeurbanne, France.
    Georgin, Éric
    CETIAT, Villeurbanne, France.
    Rochas, Jean François
    CETIAT, Villeurbanne, France.
    Sabouroux, Pierre
    Aix Marseille Univ, Marseille, France.
    Quantification of free and bound water in selected materials using dielectric and thermo-coulometric measurement methods2018In: Journal of physics communications, ISSN 2399-6528, Vol. 2, no 3, article id UNSP 035040Article in journal (Refereed)
    Abstract [en]

    Broadband electromagnetic characterization offers useful tools for the quantitative estimation of water content in a insulating solid materials. However, the correlation between electromagnetic characteristics and the amount of water in solids needs to be characterized using precise direct measurement methods. In this study, a two-port coaxial transmission cell has been characterized for water content estimation based on a study with the thermo-coulometric water detection method. The latter allows us to determine the proportions of the different water bonding forms that can exist in the material. The purpose of this paper is to provide a dielectric relaxation behavior study of the kaolinite clay from 10 MHz to 1.5 GHz, which was preceded by an experimental analysis of alpha-D-lactose monohydrate and the calcium oxalate monohydrate, which have stable water content under various humidity conditions.

  • 263.
    Azcárate,, Simon
    et al.
    Örebro University, School of Science and Technology.
    Hellman Rönnqvist, Patricia
    Örebro University, School of Science and Technology.
    Effektivisering av testmetod för produkter med låga plastytvikter: Streamlining the test method for products with low plastic surface weights2023Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to identify a more efficient method for testing products with low plastic weights. The current challenge lies in the time-consuming nature of the existing method, requiring manual handling by personnel. Over the next three years, the company anticipates a significant increase in the volume of products with low plastic weights, necessitating a corresponding increase in testing activities.The methods employed, within this report, involved data collection through interviews, observations of personnel, and sampling of the current method. Once the data was gathered, an analysis of the current situation was undertaken to formulate a test plan for new data collection, involving several tests.The test results revealed that samples can be clamped to maintain their extended, flat position. It was also demonstrated that samples can be rinsed in a water bath—whether vibrating, circulating, or stationary—and subsequently dried in an oven or with a food dehydrator, while maintaining current quality. After drying, plastic and paper could be easily separated for subsequent weight measurements. An alternative method was explored, involving the application of a tape strip to the base paper roll, preventing plastic adhesion during extrusion. This method eliminates the need for samples to be immersed in a solution, rinsed, or dried since the plastic is already separated from the paper. Implementing this method in the laboratory significantly reduces the time spent, transferring the bulk of the work to the production operators.The results obtained are not without imperfections, as some tests had relatively few measurement points, providing indicative rather than conclusive results. Another consideration is the use of a massage gun during the vibrating water bath test—a tool not intended for use by the company if they choose to adopt the new method in their operations. Consequently, new tests will be required for the selected vibrating tool, as it may have a different vibration frequency compared to the massage gun.In conclusion, the project findings suggest that the new method is more time-efficient, indicating its optimization potential. Furthermore, the method is scalable, allowing for simultaneous testing of multiple samples. The developed method is also more stable, given the reduced manual handling of samples and the lower dexterity requirements for laboratory personnel

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    fulltext
  • 264.
    Aziz, Rawen
    et al.
    Örebro University, School of Science and Technology.
    Aziz, Rami
    Örebro University, School of Science and Technology.
    Undersökning av tissue-pappers mekaniska interaktion med en taktil fingersensor2020Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Tissue paper or soft paper are materials used for hygiene purposes and are available as toilet paper, kitchen paper and handkerchiefs. Depending on the variety that is manufactured, properties are adapted based on, among other things, the choice of fibers and chemicals. The problem that exists today is that some tissues lack quality, which is exemplified by the fact that they are torn in the long run and not during the perforation. Tissue can also break after the toilet visit. This leads to increased product waste and environmental impact. As part of trying to reduce the environmental impact and optimize the properties of paper, this report is written within the constraints of a mechanical science project by the research group called “Mechanics and materials” on Orebro university. In this project, four different types of tissue have been studied. During the work, the enclosing ability of the various paper products, its contact angle, has been examined and analyzed under pressure. Furthermore, the deflection under load has also been investigated theoretically. The purpose of the work was to investigate whether there was a concise method to measure the coverage, as part of the larger research project. An objective finger-like sensor is used as a tool to see a possible correlation with the measurement method. The results showed that the method was consistent and had a correlation with the objective finger-like sensor result. For further work, further tests on the paper products are recommended to perform a thorough statistical analysis. Further connections to the properties of the paper products can also provide a deeper understanding of how the material bends under load. 

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    fulltext
  • 265. Bacciu, D.
    et al.
    Broxvall, Mathias
    Örebro University, School of Science and Technology.
    Coleman, S.
    Dragone, M.
    Gallicchio, C.
    Gennaro, C.
    Guzmán, R.
    Lopez, R.
    Lozano-Peiteado, H.
    Ray, A.
    Renteria, A.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Vairo, C.
    Self-sustaining learning for robotic ecologies2012Conference paper (Refereed)
    Abstract [en]

    The most common use of wireless sensor networks (WSNs) is to collect environmental data from a specificarea, and to channel it to a central processing node for on-line or off-line analysis. The WSN technology,however, can be used for much more ambitious goals. We claim that merging the concepts and technology ofWSN with the concepts and technology of distributed robotics and multi-agent systems can open new waysto design systems able to provide intelligent services in our homes and working places. We also claim thatendowing these systems with learning capabilities can greatly increase their viability and acceptability, bysimplifying design, customization and adaptation to changing user needs. To support these claims, we illus-trate our architecture for an adaptive robotic ecology, named RUBICON, consisting of a network of sensors,effectors and mobile robots.

  • 266.
    Bacciu, Davide
    et al.
    Dipartimento di Informatica, Università di Pisa, Pisa, Italy.
    Gallicchio, Claudio
    Dipartimento di Informatica, Università di Pisa, Pisa, Italy.
    Micheli, Alessio
    Dipartimento di Informatica, Università di Pisa, Pisa, Italy.
    Di Rocco, Maurizio
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Learning context-aware mobile robot navigation in home environments2014In: IISA 2014: The 5th International Conference on Information, Intelligence, Systems and Applications, New York: Institute of Electrical and Electronics Engineers (IEEE), 2014, p. 57-62, article id 6878733Conference paper (Refereed)
    Abstract [en]

    We present an approach to make planning adaptive in order to enable context-aware mobile robot navigation. We integrate a model-based planner with a distributed learning system based on reservoir computing, to yield personalized planning and resource allocations that account for user preferences and environmental changes. We demonstrate our approach in a real robot ecology, and show that the learning system can effectively exploit historical data about navigation performance to modify the models in the planner, without any prior information oncerning the phenomenon being modeled. The plans produced by the adapted CL fail more rarely than the ones generated by a non-adaptive planner. The distributed learning system handles the new learning task autonomously, and is able to automatically identify the sensorial information most relevant for the task, thus reducing the communication and computational overhead of the predictive task.

  • 267.
    Bakhshi, Betty
    Örebro University, School of Science and Technology.
    Kartläggning av förbättringsmöjligheter i orderplockningsprocessen2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report aims to analyze the order picking process at Reklamlogistik and find the improvement opportunities. Reklamlogistik a third party logistics company that handles the entire logistics chain for its customers.

    The report includes a literature study to obtain a theoretical approach and an analysis of the current process in purpose of mapping the order picking process.

    The report aims to answer two questions:

    • Which factors affect the order picking process?

    • What measures can be taken to streamline the order picking process?

    The study consists of an analysis of the order picking process and a literature study. Four improvement proposals have been attached as well as recommendations for further work.

  • 268.
    Balkmar, Dag
    Örebro University, School of Humanities, Education and Social Sciences.
    Masculinity and Autonomous Vehicles: From automotive emotions to transport robots2020Conference paper (Refereed)
  • 269.
    Balkmar, Dag
    et al.
    Örebro University, School of Humanities, Education and Social Sciences.
    Callerstig, Anne-Charlott
    Örebro University, School of Humanities, Education and Social Sciences.
    Eva, Lövstål
    Blekinge Tekniska Högskola.
    Hur kan elvägar bli socialt hållbara? Ett ramverk för social hållbarhet vid teknik- och miljöomställningar2022Report (Other academic)
    Abstract [sv]

    Syftet med rapporten är att utveckla och presentera ett ramverk för hur sociala hållbarhetsfrågor kan integreras inom ett framtida genomförande av elväg. Målet är att tillhandahålla ett ramverk med förhållningssätt, utgångspunkter och en modell för hur sociala perspektiv kan integreras av infrastrukturägare och andra aktörer i transportsystemet. Ramverket visar på vad som behöver fokuseras när elvägar införs, och i viss mån hur, men själva analysen (och därmed svaren) ges av infrastrukturägare och relevanta aktörer som implementerar elvägar. Ramverket visar således vad som kan vara relevant att belysa, hur det kan till samt av vilka. Ramverket ger därmed förutsättningar för att definiera konkreta målsättningar och indikatorer för social hållbarhet i ett (framtida) genomförande av elvägar. Den tilltänkta läsaren är exempelvis projektdeltagare i ett elvägsprojekt, intressenter inom systemet, eller infrastrukturägare. Ramverket kan även användas av andra aktörer som arbetar med sociala hållbarhetsfrågor i utvecklingsprojekt. 

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    Hur kan elvägar bli socialt hållbara? Ett ramverk för social hållbarhet vid teknik- och miljöomställningar
  • 270.
    Ballester, Jordi
    et al.
    Université de Bourgogne, Centre des Sciences du Goût et de l’Alimentation, Dijon, France.
    Mihnea, Mihaela
    Université de Bourgogne, Centre des Sciences du Goût et de l’Alimentation, Dijon, France.
    Peyron, Dominique
    Université de Bourgogne, Centre des Sciences du Goût et de l’Alimentation, Dijon, France.
    Valentin, Dominique
    Université de Bourgogne, Centre des Sciences du Goût et de l’Alimentation, Dijon, France.
    Exploring minerality of Burgundy Chardonnay wines: A sensory approach with wine experts and trained panellists2013In: Australian journal of grape and wine research, ISSN 1322-7130, E-ISSN 1755-0238, Vol. 19, no 2, p. 140-152Article in journal (Refereed)
    Abstract [en]

    Background and Aims: The use of minerality as a wine descriptor has increased in the last few years. Minerality always suggests high quality and evokes a link between wine and the soil. The sensory meaning of minerality, however, is not yet clearly understood. The present study was designed to understand how wine experts conceptualise minerality and to explore whether they can judge wine minerality in a consensual way.

    Methods and Results: Experts carried out an orthonasal free sorting task on 16 Chardonnay wines. Afterwards, they rated their mineral character according to two conditions: orthonasally and on the palate while wearing a nose-clip. The experts also answered a questionnaire in which they defined minerality. A trained panel independently performed a sensory description of the samples. The wine experts showed strong disagreement in their minerality judgements under both conditions. Three groups of experts emerged for each condition. Each group considered as mineral wines with quite different sensory characteristics which prevents any generalisation concerning the sensory meaning of minerality. Surprisingly, definitions of minerality by the experts showed some commonality despite the use of idiosyncratic terms.

    Conclusions: Minerality is an ill-defined sensory concept, despite the apparent consistency emerging from verbal definitions by the experts.

    Significance of the Study: Minerality is nowadays a popular term in wine marketing. Some attempts to understand its chemical origin have been made; however, this study has shown that a sensory definition of minerality should first be developed.

  • 271.
    Ballester, Jordi
    et al.
    Centre des Sciences du Goût et de l’Alimentation, Dijon, France; IUVV Jules Guyot, Université de Bourgogne, Dijon, France.
    Mihnea, Mihaela
    Centre des Sciences du Goût et de l’Alimentation, Dijon, France.
    Peyron, Dominique
    Centre des Sciences du Goût et de l’Alimentation, Dijon, France; IUVV Jules Guyot, Université de Bourgogne, Dijon, France.
    Valentin, Dominique
    Centre des Sciences du Goût et de l’Alimentation, Dijon, France; AGROSUP Dijon, Dijon, France.
    Perceived minerality in wine: a sensory reality?2014In: Wine & Viticulture Journal, ISSN 1838-6547, Vol. 29, no 4, p. 30-33Article in journal (Refereed)
  • 272.
    Banaee, Hadi
    et al.
    Örebro University, School of Science and Technology.
    Ahmed, Mobyen Uddin
    Örebro University, School of Science and Technology.
    Loutfi, Amy
    Örebro University, School of Science and Technology.
    Towards NLG for Physiological Data Monitoring with Body Area Networks2013In: 14th European Workshop on Natural Language Generation, 2013, p. 193-197Conference paper (Refereed)
    Abstract [en]

    This position paper presents an on-goingwork on a natural language generationframework that is particularly tailored fornatural language generation from bodyarea networks. We present an overview ofthe main challenges when considering thistype of sensor devices used for at homemonitoring of health parameters. The paperpresents the first steps towards the implementationof a system which collectsinformation from heart rate and respirationusing a wearable sensor.

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  • 273.
    Banaem, Hossein Yousefi
    et al.
    Tehran University of Medical Science, Tehran, Iran.
    Ahmadian, Alireza
    Tehran University of Medical Science, Tehran, Iran.
    Saberi, Hooshangh
    Tehran University of Medical Science, Tehran, Iran.
    Daneshmehr, Alireza
    University of Tehran, Tehran, Iran.
    Khodadad, Davood
    Tehran University of Medical Science, Tehran, Iran.
    Brain tumor modeling: glioma growth and interaction with chemotherapy2011In: International Conference on Graphic and Image Processing (ICGIP) / [ed] Yi Xie & Yanjun Zheng, SPIE - International Society for Optical Engineering, 2011, Vol. 8285, article id 82851MConference paper (Refereed)
    Abstract [en]

    In last decade increasingly mathematical models of tumor growths have been studied, particularly on solid tumors which growth mainly caused by cellular proliferation. In this paper we propose a modified model to simulate the growth of gliomas in different stages. Glioma growth is modeled by a reaction-advection-diffusion. We begin with a model of untreated gliomas and continue with models of polyclonal glioma following chemotherapy. From relatively simple assumptions involving homogeneous brain tissue bounded by a few gross anatomical landmarks (ventricles and skull) the models have been expanded to include heterogeneous brain tissue with different motilities of glioma cells in grey and white matter. Tumor growth is characterized by a dangerous change in the control mechanisms, which normally maintain a balance between the rate of proliferation and the rate of apoptosis (controlled cell death). Result shows that this model closes to clinical finding and can simulate brain tumor behavior properly.

  • 274.
    Bandaru, Vamsi Krishna
    et al.
    Örebro University, School of Science and Technology.
    Balasubramanian, Rajasekaran
    Örebro University, School of Science and Technology.
    OBJECT RECOGNITION USINGDIALOGUES AND SEMANTICANCHORING2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report explains in detail the implemented system containing a robot and a sensor

    network that is deployed in a test apartment in an elderly residence area. The report

    focuses on the creation and maintenance (anchoring) of the connection between the

    semantic information present in the dialog with perceived actual physical objects in the

    home. Semantic knowledge about concepts and their correlations are retrieved from online

    resources and ontologies, e.g. Word-Net and sensors information are provided by

    cameras distributed in the apartment.

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  • 275.
    Barbaranelli, Andreas
    et al.
    Örebro University, School of Science and Technology.
    Bengtsson, Pär
    Örebro University, School of Science and Technology.
    KOLFIBERFÖRSTÄRKNING – En jämförelse mellan kolfiberförstärkning och traditionella förstärkningsmetoder2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A building part could need a reinforcement. It could be a system of joists that are soon going to be loaded with heavier loads when business is changing from residence to an office. The alternate solution to reinforce that kind of construction would be with steel beams and columns or increase the height of the floor with more concrete. What few constructors and contractors know are the solution with carbon fiber reinforcement could be a better alternative.

    The purpose of the thesis is to study if carbon fiber reinforcement could compete with traditional reinforcement methods. From a calculating and a work-related perspective the project will underline the pro and cons with all of the reinforcement methods. To demonstrate how carbon fiber increase the bending moment capacity have lab and calculation of a real bridge project been executed. In both cases have a carbon fiber solution been compared with traditional reinforcement methods.

    The result of the thesis shows that carbon fiber reinforcement could replace traditional methods in many cases. The pros with the carbon fiber reinforcement is the light weight and high tensile strength that makes it possible, on an efficient way, increase the bending moment capacity in a building part. The thesis lab result shows that a carbon fiber reinforcement does have the same percentage increase in strength as a flat steel reinforcement.

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  • 276.
    Barber, Ramón
    et al.
    Robotics Lab, Universidad Carlos III de Madrid, Avda. de la Universidad, Leganés, Spain.
    Ortiz, Francisco J.
    Department of Automation, Electrical Engineering and Electronics Technology, Universidad Politécnica de Cartagena, Cartagena, Spain.
    Garrido, Santiago
    Robotics Lab, Universidad Carlos III de Madrid, Avda. de la Universidad, Leganés, Spain.
    Calatrava Nicolás, Francisco
    Örebro University, School of Science and Technology.
    Mora, Alicia
    Robotics Lab, Universidad Carlos III de Madrid, Avda. de la Universidad, Leganés, Spain.
    Prados, Adrián
    Robotics Lab, Universidad Carlos III de Madrid, Avda. de la Universidad, Leganés, Spain.
    Vera-Repullo, José Alfonso
    Department of Automation, Electrical Engineering and Electronics Technology, Universidad Politécnica de Cartagena, Cartagena, Spain.
    Roca-González, Joaquín
    Department of Automation, Electrical Engineering and Electronics Technology, Universidad Politécnica de Cartagena, Cartagena, Spain.
    Méndez, Inmaculada
    Department of Evolutionary and Educational Psychology, Faculty of Psychology, University of Murcia, Murcia, Spain.
    Martinez Mozos, Oscar
    Örebro University, School of Science and Technology.
    A Multirobot System in an Assisted Home Environment to Support the Elderly in Their Daily Lives2022In: Sensors, E-ISSN 1424-8220, Vol. 22, no 20, article id 7983Article in journal (Refereed)
    Abstract [en]

    The increasing isolation of the elderly both in their own homes and in care homes has made the problem of caring for elderly people who live alone an urgent priority. This article presents a proposed design for a heterogeneous multirobot system consisting of (i) a small mobile robot to monitor the well-being of elderly people who live alone and suggest activities to keep them positive and active and (ii) a domestic mobile manipulating robot that helps to perform household tasks. The entire system is integrated in an automated home environment (AAL), which also includes a set of low-cost automation sensors, a medical monitoring bracelet and an Android application to propose emotional coaching activities to the person who lives alone. The heterogeneous system uses ROS, IoT technologies, such as Node-RED, and the Home Assistant Platform. Both platforms with the home automation system have been tested over a long period of time and integrated in a real test environment, with good results. The semantic segmentation of the navigation and planning environment in the mobile manipulator for navigation and movement in the manipulation area facilitated the tasks of the later planners. Results about the interactions of users with the applications are presented and the use of artificial intelligence to predict mood is discussed. The experiments support the conclusion that the assistance robot correctly proposes activities, such as calling a relative, exercising, etc., during the day, according to the user's detected emotional state, making this is an innovative proposal aimed at empowering the elderly so that they can be autonomous in their homes and have a good quality of life.

  • 277.
    Bark, Alexander
    et al.
    Örebro University, School of Science and Technology.
    Hygerth, Fredrik
    Örebro University, School of Science and Technology.
    Söka en signifikant skillnad huruvida skadeutvecklingen skiljer mellan punktlast och utbredd last inom pappersteknik2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Thesis work performed on behalf of BillerudKorsnäs AB, the project is part of a larger research project which the company works with. BillerudKorsnäs would like to provide the optimum material for the cartonboard that the customer seeks. This report deals with the problem of whether the fracture development differs between the point load and distributed load in paper technology. To limit the scope of the project, five spherical loads were chosen to attack a total of four selected panels. The four panels are specifically selected and divided into two geometrically distinct cartonboards but with the same quality. The project investigated parameters structural stiffness and structural strength from the unloaded condition to initial damage development in cartonboards. The results from the tests will be presented inaquantitative analysis of compiled charts, force-/extension charts and qualitative analysis of fracture development. The purpose of the project, the significant difference, was found in the result when the structural stiffness increased nonlinearly when tested with certain loads. The project presents a conclusion that the load 1-3 is point load and load 5 is distributed load on all panels. The project presents a basis for further development towards the final goal that BillerudKorsnäs is working toward.

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  • 278.
    Bark, Johannes
    et al.
    Örebro University, School of Science and Technology.
    Forsberg, Hannes
    Örebro University, School of Science and Technology.
    En förstudie av alternativa saltbehandlingar.2021Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Company Nobel Biocare is a producer of dental implants. As implants are used in the mouth the medical restrictions are high. A saline solution is used to help the bone around the implants heal faster. The saline solution is currently applied using a salt bath followed by an adjustment step to remove superfluous salt.This report describes a pre-study to find one or more methods that could simplify the salt application. The focus was on spraying methods, flow coating and physical vapor deposition. Finally, a ranking was done to suggest the top candidate for prototype testing.

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  • 279.
    Barsaddo, Cassandra
    et al.
    Örebro University, School of Science and Technology.
    Hadzic, Armin
    Örebro University, School of Science and Technology.
    Förarstödsystemets funktion vid detektering av vilt2022Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Driver support systems have been around for a long time, but technology and digitization continue to evolve daily. Technology development is in constant motion. The systems that are being developed today have, in relation to the remaining vehicle technology, been given a significantly large and conditional development in a short time and are still new to humans. As there is limited knowledge about how driver support systems work when it comes to game detection, this study aims to create an in-depth understanding of what functions exist in driver support systems today, through a kind of current situation analysis, which detects game, how these can reduce collision with game and what prospects there are regarding the development of these systems and functions. To fulfil the purpose, interviews are conducted with leading car manufacturers and subcontractors to the automotive industry and industry experts. A thematic analysis is used to process collected empirical data. The study's processed empirics are presented in the following themes: Presentation of companies and respondents; Current situation analysis; Challenges and future opportunities; Commercial aspects; and Future projections. There is a consistent picture in the results that support systems for game detection are in their infancy and that the main benefits of these are an early detection of game, which can reduce the risk of serious accidents. Technical advances are being made whose main purpose is to make the driver more involved in their driving and at the same time expand the communication between road users and infrastructure. Obstacles to development lie in market factors and unclear national and international rules. 

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  • 280.
    Barsom, Daniella
    et al.
    Örebro University, School of Science and Technology.
    Osama, Rand
    Örebro University, School of Science and Technology.
    EFFEKTIVISERING AV DELMOMENT I PROCESSKARTLÄGGNING2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis involves a process mapping to the rebuilding of the gymnasium of Vivallaskolan that burned down at the end of October 2010. Analyses and observations in the activity flow are based on the process mapping. There it shows what subsection that has gone well and less well. Suggested solutions have been made to the problems that gone less well. These solutions show clearly how they can be improved and are based on the following methods: the PDCA-cycle (page 21), BIM (page 21) and Ishikawa diagrams (page 21).

    This process mapping and suggested solutions are based on observations at the construction site together with reading literature and electronic sources. During visits and conversations with the construction manager and carpenters it have been recognized that Lean, which is a method for efficiency of different activity flows, are already partially used in the production of this construction project. These suggested solutions have been made to improve and develop the production phase qualitatively.

    During the survey and analysis of the process mapping, those who are involved in this construction project can clearly see and follow these suggested solutions. These are made to avoid upcoming problems which have been described in this thesis. These solutions can be used to upcoming construction projects already at the designing and calculation phase.

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  • 281.
    Barton, Jakob
    et al.
    Örebro University, School of Science and Technology.
    Rödjemyr, Gustav
    Örebro University, School of Science and Technology.
    En undersökning av prefabricerade och platsbyggda utfackningsväggar2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    NCC – Nordic Construction Company – in Örebro has recently decided to use prefabricated

    infill-walls as a method of choice. This report aims to explore, compile and compare the

    method of prefabricating infill-walls with the method of building infill-walls on site. The

    comparison has been made through considering aspects such as work environment, time

    consummation, manufacturing and production costs.

    The report has been conducted upon request from NCC in order to provide an indication of

    which method of production that present the best alternative for future projects. Interviews

    and information from relevant and ongoing projects in the Örebro area constitutes the basis of

    this report. All references to costs and time are based upon actual time schemes and invoices

    collected from said projects. The work environment has been compared to the risk analysis

    made by responsible staff members on site, all in accordance with the Swedish Work

    Environment Authority’s (Arbetsmiljöverket) directives. According to this report the

    difference in financial terms between site build and infill-walls is not that big. By using

    prefabricated infill-walls the report shows that you can save a lot of time. The report has been

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  • 282.
    Baryauno, Samuel
    et al.
    Örebro University, School of Science and Technology.
    Koc, Markus
    Örebro University, School of Science and Technology.
    VR under försäljningsskedet av nyproduktion - Med kunden i fokus2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This examination is about how the customer looks at VR (Virtual Reality) as a field of use during a sales stage of newly produced apartments. The report deals with VR as a visual technology and future solutions. Today, customers reads both two-dimensional and three-dimensional drawings before a purchase of an apartment, which is what most brokerage companies have to offer at the moment. PresentationthroughVRenvironmentshasbeguntoenterthepicture,thequestionis whether it benefits the customer and whether it becomes an obvious solution in future presentations. Examination is done to see if the visualization tool gives a better picture of newly produced apartments and whether it prevents misunderstandings for the customer and if it shortens the sales time. To achieve the purpose, VR tests and question surveys were accomplished by customers. The participants have been divided into three different groups where each group has received different tasks. One group has read drawings, the other has entered a VR environment and the third has done both. Thereafter, the groups have been allowed to enter the apartment to be able to answer the question surveys. The tests and the surveys show that customers perceive VR as a better solution during presentation of the apartment in comparison with drawings. The result also shows that VR reduces the misunderstandings that make iteasierforthecustomertodecide,whichleadstoa shorter sales time.

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  • 283.
    Basic, Mehmed
    Örebro University, School of Science and Technology.
    Specifikation av OP-tid (Operation Time)2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this technical thesis is to investigate different methods and tools to measure the OP time (operating time). Ericsson is headquartered in Stockholm,and is divided into different departments, these department’s together has approximately 10 000 employees who is specializedin their areas. The focus of this technical report has been to investigate the questions like, what is OP time, is there a way to measure the OP time.The Department that is the focus of this project produces filters for radio base stations. This should be viewed both from a financial and engineering perspective. This examine will give an explanation on what the OP time is in a test lab environment and to give suggestions on how to measure the OP time. Time is money which means that a separation between OP time and other time will lower the unnecessary costs. By establishing "clean" OP time apart from other time, obtains the actual cost of the product. In theory section Lean production and JIT (just in time) and its grounds will be described. The idea is to compare a volume business with a prototype business, and thereafter focus on the prototype business, specifically on its problem areas and solutions.

  • 284.
    Bauducco, Serena
    et al.
    Örebro University, School of Behavioural, Social and Legal Sciences. College of Psychology, Flinders University, Adelaide South Australia, Australia.
    Boersma, Katja
    Örebro University, School of Behavioural, Social and Legal Sciences.
    Gradisar, Michael
    WINK Sleep Pty Ltd, Adelaide South Australia, Australia; Sleep Cycle AB, Gothenburg, Sweden.
    Sleepy and popular? The association between popularity, sleep duration, and insomnia in adolescents2024In: Frontiers in Sleep, section Pediatric and Adolescent Sleep, E-ISSN 2813-2890Article in journal (Refereed)
    Abstract [en]

    Introduction: During adolescence, peers gain a central role and with the availability of technology, socializing can occur around the clock. Very few studies have focused on the role of peers in adolescents’ sleep using social network analyses. These analyses describe peer relationships and social positions in a defined context (e.g., school) based on friendship nominations. Adolescents who receive many nominations can be defined as “popular”, which has been found to have its costs (i.e., shorter sleep duration) but also benefits (i.e., fewer insomnia symptoms). The aim of this study was to partially replicate and expand previous findings in a large Swedish sample of adolescents.

    Method: The sample included 1394 adolescents (46% girls, Mage = 15.3, SD = .53, range 14-18) from 16 public schools in middle Sweden. Adolescents reported on their weekly sleep duration, insomnia symptoms, anxiety, depression, alcohol use, demographics, and nominated up to three friends in school. We used R to calculate outgoing nominations and incoming nominations. Linear regressions were used to examine the association between popularity and sleep, controlling for confounding variables (demographics, emotional problems). Finally, we explored sex differences.

    Results: Controlling for confounders, popular adolescents reported shorter sleep duration (B=-3.00; 95% CI [-5.77, -0.19]), and popular girls reported more insomnia symptoms (B = 0.36; 95% CI [.04,.68]). There were no significant associations found for boys. 

    Discussion: Popularity was linked to shorter sleep duration (up to -27 minutes for the most popular teens). Moreover, girls may pay a price for their popularity by experiencing more insomnia symptoms. Sex differences and potential mechanisms should be further explored.

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  • 285.
    Bazzan, Ana L. C.
    et al.
    UFRGS, Porto Alegre, Brazil.
    de Oliveira, Denise
    UFRGS, Porto Alegre, Brazil.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Nagel, Kai
    TU Berlin.
    To adapt or not to adapt: consequences of adapting driver and traffic light agents2008In: Adaptive agents and multi-agent systems III: adaptation and multi-agent learning : 5th, 6th, and 7th European Symposium,ALAMAS 2005-2007on Adaptive and Learning Agents and Multi-Agent Systems : revised selected papers / [ed] Karl Tuyls, Ann Nowe, Zahia Guessoum, New York: Springer , 2008, p. 1-14Conference paper (Refereed)
    Abstract [en]

    One way to cope with the increasing traffic demand is to integrate standard solutions with more intelligent control measures. However, the result of possible interferences between intelligent control or information provision tools and other components of the overall traffic system is not easily predictable. This paper discusses the effects of integrating co-adaptive decision-making regarding route choices (by drivers) and control measures (by traffic lights). The motivation behind this is that optimization of traffic light control is starting to be integrated with navigation support for drivers. We use microscopic, agent-based modelling and simulation, in opposition to the classical network analysis, as this work focuses on the effect of local adaptation. In a scenario that exhibits features comparable to real-world networks, we evaluate different types of adaptation by drivers and by traffic lights, based on local perceptions. In order to compare the performance, we have also used a global level optimization method based on genetic algorithms.

  • 286.
    Bazzan, Ana L. C.
    et al.
    UFRGS, Porto Alegre, Brazil.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Re-routing agents in an abstract traffic scenario2008In: Advances in artificial intelligence: SBIA 2008 / [ed] Gerson Zaverucha, Augusto Loureiro da Costa, Berlin: Springer , 2008, p. 63-72Conference paper (Refereed)
    Abstract [en]

    Human drivers may perform replanning when facing traffic jams or when informed that there are expected delays on their planned routes. In this paper, we address the effects of drivers re-routing, an issue that has been ignored so far. We tackle re-routing scenarios, also considering traffic lights that are adaptive, in order to test whether such a form of co-adaptation may result in interferences or positive cumulative effects. An abstract route choice scenario is used which resembles many features of real world networks. Results of our experiments show that re-routing indeed pays off from a global perspective as the overall load of the network is balanced. Besides, re-routing is useful to compensate an eventual lack of adaptivity regarding traffic management.

  • 287.
    Bazzan, Ana L.
    et al.
    UFRGS, Porto Alegre, Brazil.
    Klügl, FranziskaÖrebro University, School of Science and Technology.
    Multi-agent systems for traffic and transportation engineering2009Collection (editor) (Other academic)
  • 288.
    Bdaoui, Martina
    et al.
    Örebro University, School of Science and Technology.
    Aro, Vartouhi
    Örebro University, School of Science and Technology.
    Effektivare trafik inom smarta städer2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Smart cities are about meeting people's needs and living environment, this can be accomplished by developing different parts of the city. Sweden attaches great importance to the roads, infrastructure and the environment in ordertoachievethestabletrafficsafety.This has led to Sweden being better than many other countries as they are far ahead of the development. The UN has nowsetglobalgoalsforsustainabledevelopmenttobeachievedin 2030. These goals will give the countries a sustainable development and a future. The aim ofthisstudyistodevelopideasforasustainableguidelinefortheurbanenvironment that will lead to less traffic and a better environment. The ideas that were developed were to be able to reduce traffic in the center and its environmental impact. Idea 1 meant that a bus, which should be self-driving in the future, with about ten places that pick up people from different areas and transport everyone to the same destination.Thebusesareorderedfroman app in the mobile. This is a vision to reduce the number of self-driving drivers in vehicle traffic and to reduce greenhousegasemissions.Idea2,ontheotherhand,isabouttheparking in the center. The idea is to move all parking spaces a bit out of town and then to take an environmentally friendly vehicle, which here is self-driving, with other passengers entering the center. This vision wants to achieve a traffic-free center. To seeiftheideaswerefeasible and possible according to the respondents, questionnaires aimed at the target group, which drive vehicles into Örebro center, were produced. An interview with the unit manager for urban and traffic planning at Örebro municipality is also taking place tofindoutitsviewson the smart city and what solutions are possible for example to be able to solvethesustainable travel by public transport. This compiles literature for the collection of data from the traffic within smart cities. This study has been delimited to urban and traffic planning, where traffic includes, among other things, vehicle and public transport in the urban environment and passenger cars that travel through the center of Örebro. Örebro is the city to which the study is limited. After compiling the questionnaires and the interview, the resultshowsthatthedifferentideas that have been developed have given differentresultswhenitcomestothedifferentmethods. As a whole, it will be difficult to set a more concrete result because alargeproportionofthe respondents of the questionnaires and the unit manager have had different views on the solutions developed, which means that a conclusion cannot be drawn from the aggregate results. Inordertoobtainamoreconcreteresultofthesolutionsthathavebeendeveloped,the error sources should betakenintoaccountandfollowedupbytheerrorsthathavebeenmade. This could then provide a more in-depth analysis for the result and if the work is developed and improved, this paper can benefit society, which wouldcontributetomoreefficienttraffic in smart cities.

  • 289.
    Bdaoui, Mikael
    et al.
    Örebro University, School of Science and Technology.
    Nafisa, Mustaf Cali
    Örebro University, School of Science and Technology.
    En jämförelse mellan madagaskar och sverigeLagar, regler och säkerhet2020Independent thesis Basic level (Higher Education Diploma (Fine Arts)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Every country have different laws and rules regarding construction work. These laws and rules are a foundation of how the structure in a country is.There is many reasons why some countries have more laws and rules than others. By studying a country like Sweden and compare it with Madagascar will show distinct differences when it comes to laws and rules. This study will examine the differences that exist and analyze whether the laws and rules that differs are at an advantage or a disadvantage.The purpose of this study is to compare an industrialized- and a developing country regarding laws and rules. In this case Madagascar and Sweden.This study is based on interviews, literature, and a travel book from a trip to Madagascar. The reason why Madagascar was chosen is because Madagascar has significant difference between structure and security. The information regarding Madagascar is based on a travel book that was written from a journey in the respective country.Countries that have similar structures and laws like Sweden are not included in this study. Since there are many laws and rules in Sweden, there will be a limitation to what laws and rules that will be applied in this study.This study shows that laws and rules are a contributing aspect to a structured, sustainable, functional building and indicates that the construction process in Sweden takes more time than what it does in Madagascar. This study also proves that a community can work without many laws and rules, however the solidity will be compromised. The safety in workplace in each country differs, with Sweden having more laws and rules regarding works safety. By having more laws and rules regarding safety leads to fewer accidents to occur as well as preventing ill-health.

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  • 290.
    Beeson, Patrick
    et al.
    TRACLabs Inc., Webster TX, USA.
    Kortenkamp, David
    TRACLabs Inc., Webster TX, USA.
    Bonasso, R. Peter
    TRACLabs Inc., Webster TX, USA.
    Persson, Andreas
    Örebro University, School of Science and Technology.
    Loutfi, Amy
    Örebro University, School of Science and Technology.
    Bona, Jonathan P
    State University of New York, Buffalo, USA.
    An Ontology-Based Symbol Grounding System for Human-Robot Interaction2014In: Artificial Intelligence for Human-Robot Interaction: 2014 AAAI Fall Symposium, AAAI Press, 2014, p. 48-50Conference paper (Refereed)
    Abstract [en]

    This paper presents an ongoing collaboration to develop a perceptual anchoring framework which creates and maintains the symbol-percept links concerning household objects. The paper presents an approach to non-trivialize the symbol system using ontologies and allow for HRI via enabling queries about objects properties, their affordances, and their perceptual characteristics as viewed from the robot (e.g. last seen). This position paper describes in brief the objective of creating a long term perceptual anchoring framework for HRI and outlines the preliminary work done this far.

  • 291.
    Beiruti, Michel
    Örebro University, School of Science and Technology.
    OPTIMERING VID VAL AV BJÄLKLAGSTYP2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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    Optimering vid val av bjälklagstyp
  • 292.
    Bengtsson, André
    et al.
    Örebro University, School of Science and Technology.
    Uppström, Ida
    Örebro University, School of Science and Technology.
    ÅTERANVÄNDNINGSPOTENTIALEN AV STOMME I STÅLHALL: THE POTENTIAL OF REUSING STEEL COMPONENT IN STEEL CONSTRUCTIONS2023Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The construction industry accounts for about 20% of society's total greenhouse gas emissions and steel production is one of the major climate villains. To achieve set climate goals and slow down global warming, all actors, large and small, must take responsibility. One way to reduce emissions from the steel is to reuse it as it avoids the demanding manufacturing process. In Sweden, interest in the racket sport of padel has increased in recent years and many padel companies therefore chose to build padel halls around the country. The halls are now for many in terms of the number of players and most padel companies are forced into bankruptcy.This development means that empty halls will be standing around the country.The purpose of this study is to investigate the reuse potential of the frame of an existing steel hall. Is it economically and environmentally justifiable to reuse an existing steel frame compared to producing a new one? The study is based on climate calculations and cost calculations for the reuse of existing frame and new production of identical frame. Climate calculations are carried out using two different methods, one based on Boverket’s generic climate database, and one based on product-specific climate data from environmental product declarations. Through requests for quotations and discussions with actors involved in the reuse and new production process, costs are obtained for reuse and new production of frame. This study shows that it is beneficial to reuse the existing frame from an environmental and an economic perspective. The economic comparison shows that it costs about 46% less to reuse the frame compared to producing it again and in this case, it corresponds to about SEK 528,000. The product-specific climate calculations are considered more realistic and are therefore valued higher than the climate calculations based on Boverket's generic climate database. The recycled frame generates 1015 kg of carbon dioxide equivalents and the newly produced generates 17 666 kg of carbon dioxide equivalents. The climate footprint of recycled frame corresponds to about 6% of newly produced.

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  • 293.
    Bengtsson, Linda
    et al.
    Örebro University, School of Science and Technology.
    Skog, Lucas
    Örebro University, School of Science and Technology.
    Förädling av arbetsorderproccessen med Lean2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Quant Service Sweden AB wanted their maintenance systems to be reviewed and documented, because there is no documentation for a comprehensive overview of the operations today. The processes they wanted documented were regarding preventive maintenance, work orders, and purchases and supplies. A demarcation was made and it is only the work order process discussed in this report. The purpose of the work is to document the work order process and to review it based on a Lean perspective, which is used as a basis for developing improvement proposals.

    In order to produce the results, work was started with process mapping where a flow analysis was conducted to review what happens at each stage of the work order process. Then, the Lean tools 7 + 1 wastes, 5S and 5 why were applied to identify problems.

    The result was a documented work order process. In addition to that, some problems were detected using the Lean tools. The main problems are that there is no standardized approach and that it is not structured. The work is carried out today with unnecessary movements and the reporting of work orders is performed badly or not at all, which leads to material shortages that make emergency work impossible. By structuring the maintenance system, developing a mobile solution for work order management, locking users to commenced work orders and inventing inventory, Quant Service Sweden AB can solve problems and make work more effective.

  • 294.
    Bengtsson, Per
    et al.
    Örebro University, School of Science and Technology.
    Fransson, Martin
    Örebro University, School of Science and Technology.
    Ställtidsreducering vid orderbyte: En fallstudie på Millcon AB2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Millcon AB is a company that performs a service which is roll converting of paper. The company has recently noticed that their production waste a lot of time between orders due to mandatory setup activities, when a change of order in their rolling machines needs to be done. This leads to reduced production, which consequently contributes to reduced profitability for the company. This thesis will generate comprehensive data consisting of suggestions for improvement for the company to reduce setup time at one of their machines, but the suggestions for improvement can be used on all the machines that the company possess if certain modifications are made. The SMED method has been the main basis of the literature study which have been required to accomplish this thesis. The thesis began with a survey of how the conversion work is carried out at the present time, the survey was done with the help of video filming and interviews. Then several improvements which consisted of various opportunities to improve efficiency of the conversion process was made. The thesis concludes with a discussion of whether the streamlining suggestions that emerged are credible to generate a more time efficient approach for the company’s setup activities. The discussion then results in a number of finding conclusions, the conclusions are expected to provide Millcon a basis for their further improvement of their setup activities between orders.

  • 295.
    Bennetts, Victor Hernandez
    et al.
    Örebro University, School of Science and Technology.
    Schaffernicht, Erik
    Örebro University, School of Science and Technology.
    Stoyanov, Todor
    Örebro University, School of Science and Technology.
    Lilienthal, Achim J.
    Örebro University, School of Science and Technology.
    Trincavelli, Marco
    Örebro University, School of Science and Technology.
    Robot Assisted Gas Tomography - Localizing Methane Leaks in Outdoor Environments2014In: 2014 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA), IEEE conference proceedings, 2014, p. 6362-6367Conference paper (Refereed)
    Abstract [en]

    In this paper we present an inspection robot to produce gas distribution maps and localize gas sources in large outdoor environments. The robot is equipped with a 3D laser range finder and a remote gas sensor that returns integral concentration measurements. We apply principles of tomography to create a spatial gas distribution model from integral gas concentration measurements. The gas distribution algorithm is framed as a convex optimization problem and it models the mean distribution and the fluctuations of gases. This is important since gas dispersion is not an static phenomenon and furthermore, areas of high fluctuation can be correlated with the location of an emitting source. We use a compact surface representation created from the measurements of the 3D laser range finder with a state of the art mapping algorithm to get a very accurate localization and estimation of the path of the laser beams. In addition, a conic model for the beam of the remote gas sensor is introduced. We observe a substantial improvement in the gas source localization capabilities over previous state-of-the-art in our evaluation carried out in an open field environment.

  • 296.
    Bennewitz, Maren
    et al.
    University of Freiburg.
    Burgard, Wolfram
    University of Freiburg.
    Cielniak, Grzegorz
    Örebro University, Department of Technology.
    Thrun, Sebastian
    Carnegie Mellon University.
    Learning motion patterns of people for compliant robot motion2005In: The international journal of robotics research, ISSN 0278-3649, E-ISSN 1741-3176, Vol. 24, no 1, p. 31-48Article in journal (Refereed)
    Abstract [en]

    Whenever people move through their environments they do not move randomly. Instead, they usually follow specific trajectories or motion patterns corresponding to their intentions. Knowledge about such patterns enables a mobile robot to robustly keep track of persons in its environment and to improve its behavior. This paper proposes a technique for learning collections of trajectories that characterize typical motion patterns of persons. Data recorded with laser-range finders is clustered using the expectation maximization algorithm. Based on the result of the clustering process we derive a Hidden Markov Model (HMM) that is applied to estimate the current and future positions of persons based on sensory input. We also describe how to incorporate the probabilistic belief about the potential trajectories of persons into the path planning process. We present several experiments carried out in different environments with a mobile robot equipped with a laser range scanner and a camera system. The results demonstrate that our approach can reliably learn motion patterns of persons, can robustly estimate and predict positions of persons, and can be used to improve the navigation behavior of a mobile robot.

  • 297.
    Beno, Tomas
    et al.
    University West, Trollhättan, Sweden.
    Repo, Jari
    University West, Trollhättan, Sweden.
    Pejryd, Lars
    Örebro University, School of Science and Technology.
    The use of machine tool internal encoders as sensors in a process monitoring system2013In: International Journal of Automation Technology, ISSN 1881-7629, E-ISSN 1883-8022, Vol. 7, no 4, p. 410-417Article in journal (Refereed)
    Abstract [en]

    Tool wear in machining changes the geometry of the cutting edges, which affects the direction and amplitudes of the cutting force components and the dynamics in the machining process. These changes in the forces and dynamics are picked up by the internal encoders and thus can be used for monitoring of changes in process conditions. This paper presents an approach for the monitoring of amulti-toothmilling process. The method is based on the direct measurement of the output from the position encoders available in the machine tool and the application of advanced signal analysis methods. The paper investigates repeatability of the developed method and discusses how to implement this in a process monitoring and control system. The results of this work show that various signal features which are correlated with tool wear can be extracted from the first few oscillating components, representing the low-frequency components, of the machine axes velocity signatures. The responses from the position encoders exhibit good repeatability, especially short term repeatability while the long-term repeatability is more unreliable.

  • 298.
    Berg, Niklas
    et al.
    Örebro University, School of Science and Technology.
    Persson, Isac
    Örebro University, School of Science and Technology.
    Jämförelse mellan två metoder för mätning av kartongförpackningars greppstyvhet2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This Bachelor’s thesis is a collaborated work done between the paper manufacturer BillerudKorsnäs and Örebro University, within the research project "A New Model for Deformation of Carton Board Packages by Manual Handling". The aim of this work is to test and evaluate two methods regarding their ability to determine grip stiffness of cartonboard packages. This was achieved by analyzing how well each method was able to distinguish between various cartonboard qualities.

    The two methods that were compared were: box compression tests performed by a Lloyd Instrument LR5K tensile testing unit, and BioTac which is a finger-like tactile sensory device made by Syntouch LLC.

    About 120 box compression tests, with varying sphere sizes, were performed on cartonboard packages supplied by BillerudKorsnäs. Statistical methods were then applied to the data from these tests in order to see whether this method was able to distinguish between the different cartonboard materials.

    A member of the research project had previously performed experiments using the BioTac on the same types of packages. Data from those experiments underwent the same statistical tests. The results from the two methods could thus be compared.

    Albeit being able to distinguish maximum stiffnesses between the cartonboard materials for arbitrary forces, the box compression method failed at this endeavor for fixed low forces. The BioTac, however, showed better results in that regard.

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  • 299.
    Bergendahl, Fredrik
    Örebro University, School of Science and Technology.
    RENODLA FLÖDET FÖR POWERTRONIC TRANSMISSIONENS ARTIKLAR2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Powertronic department at Volvo Powertrain, Köping manufactures and assembles automatic transmission called Powertronic and is primarily used in construction equipment. The manufacturing of parts for the gearbox has been the same in terms of layout and article flow point since the start of the department. The demand on the gearbox becomes more and more important due to price and quality, this results in the desire to be able to control and manage the time of how long the details are in manufacturing before assembly. It is difficult to achieve this because spare parts and prototypes are produced in the same machines and the workflow contains sections that are slow and difficult to assume the amount of time.

     

    The idea behind this study is to verify which of all the details that belong to the Powertronic gearbox and make a new flow of articles. The goal is to make it easier to manage and control the manufacturing time of articles and get exact value of this, resulting in reduced inventory and more profit. To achieve the desired results, analysis of flow and calculations of the differences between for and after a new flow and layout was implemented.

     

    The results show that improvements can be done for instance the production time of an article can be reduced by days. To get a new flow of articles requires some initial investments, most can be done with existing equipment.

     

    The recommendation is to place the new multi-tasking machine by following the proposal in this study and secondly to obtain a balancing equipment. 

  • 300.
    Berger, David
    et al.
    Örebro University, School of Science and Technology.
    Haglund, Martin
    Örebro University, School of Science and Technology.
    Standardiserat arbetssätt inom konverteringsindustrin, med avseende på AQL2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project has been taking place at Schur Pack Sweden in Kumla, which manufactures packaging for the food industry. The lack of existing quality control on outbound deliveries has led to complaints. In order to check outbound deliveries, the company had a desire to introduce quality controls, this through a standard named SS 02 01 30.

    This project has been performed by a method that is established in quality management, developed for this kind of project. To find out what failure that may appear on the products has meetings, study visits and a pilot study been performed. The project has resulted in a routine developed with instructions for quality checks of outbound products, with associated lists of failure types. After that this project is done, the company will have the knowledge to be able to act by the standard SS 02 01 30.

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    Standardiserat arbetssätt inom konverteringsindustrin, med avseende på AQL
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