oru.sePublikationer
Change search
Refine search result
2345678 201 - 250 of 1703
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 201.
    Bimer, Hampus
    et al.
    Örebro University, School of Science and Technology.
    Stenmark, Jonas
    Örebro University, School of Science and Technology.
    Optimering av produktionslinje för att reducera ledtiden: En fallstudie på Seco Tools AB i Arboga2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This case study has been carried out at the Seco Tools factory in Arboga. Seco Tools is one of the world's largest providers of comprehensive metal cutting solutions for milling, turning, holemaking and tooling systems. The majority of the Arboga factory are at the front edge with continuous improvements. However, since a time back problems have occurred with one of their manufacturing lines. The problem that Seco Tools considers to have with the line is the long lead time and the current layout is far from optimal.

    The purpose of this case study was to make a mapping of the process and then analyze and make suggestions on how the process could be more effective with considerations of reducing lead time. The proposals have been made by empirical data collection through interviews with employees as well as observations in production. The information obtained has been studied and analyzed using several theories and tools, and thereafter suggestions have been made for improvements. Five proposals for different alternative layouts have been made, but also more general improvement proposals have been put forward to accomplish a positive impact on the lead time of the process. These proposals will serve as a supporting basis for Seco Tools in their continued efforts to improve the process.

  • 202. Birk, Andreas
    et al.
    Poppinga, Jann
    Stoyanov, Todor
    Örebro University, School of Science and Technology.
    Nevatia, Yashodhan
    Planetary Exploration in USARSim: A Case Study including Real World Data from Mars2009In: RoboCup 2008: Robot Soccer World Cup XII / [ed] Volume editors: Luca Iocchi, Hitoshi Matsubara, Alfredo Weitzenfeld, Changjiu Zhou, Springer Berlin Heidelberg , 2009, 463-472 p.Conference paper (Refereed)
    Abstract [en]

     Intelligent Mobile Robots are increasingly used in unstructured domains; one particularly challenging example for this is, planetary exploration. The preparation of according missions is highly non-trivial, especially as it is difficult to carry out realistic experiments without, very sophisticated infrastructures. In this paper, we argue that, the, Unified System for Automation and Robot Simulation (USARSim) offers interesting opportunities for research on planetary exploration by mobile robots. With the example of work on terrain classification, it, is shown how synthetic as well as real world data, from Mars call be used to test an algorithm's performance in USARSim. Concretely, experiments with an algorithm for the detection of negotiable ground oil a, planetary surface are presented. It is shown that the approach performs fast; and robust on planetary surfaces.

  • 203. Birk, Andreas
    et al.
    Stoyanov, Todor
    Örebro University, School of Science and Technology.
    Nevatia, Yashodhan
    Ambrus, Rares
    Poppinga, Jan
    Pathak, Kaustubh
    Terrain Classification for Autonomous Robot Mobility: from Safety, Security Rescue Robotics to Planetary Exploration2008Conference paper (Refereed)
  • 204.
    Bjuhr, Jessica
    et al.
    Örebro University, School of Science and Technology.
    Jansson, Maria
    Örebro University, School of Science and Technology.
    Förstudie kring verktyg för DCN registrering/uppföljning2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis work has been performed on a department that works with preparation for new products. They are in charge of coordinating several different units during these preparations. In the current situation, this process does not work optimally. There is no common approach to monitoring and documentation of the process which leads to difficulties in the interaction between the units. Problems have also arisen when the product has been put into production. The company is also working with the ISO 9001 and 14001, which requires documentation and monitoring of the process.

    The aim of the project is to present the basic steps for a new approach for documentation and monitoring in this process from a case study. Interviews with employees in the process have been conducted to gather information about the current approach. In addition, literary studies and benchmarking have been used as methods.

    Based on this, improvement proposals for the work of documentation and monitoring have been developed. The proposals may also contribute to increased understanding of the process and improved collaboration between the employees. However, this is not something that can be guaranteed. The improvement proposals should be seen just as a suggestion for improvement and not hindsight on how the work should be designed in the process.

  • 205.
    Bjureland, Sofie
    et al.
    Örebro University, School of Science and Technology.
    Lagré, Daniel
    Örebro University, School of Science and Technology.
    Problemlösning - en systematisk litteraturstudie över undervisningsmetoder som främjar elevers problemlösningsförmåga2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This systematic review aims to present teaching methods that research show enhances students´ problem solving skills. The review is completed by an analysis of 66 international articles. The analysis resulted in an identification of nine teaching methods. The overall result of the study shows that the nine teaching methods all enhances students’ problem solving skills. The results also suggest that the single most important factor to enhance students´ problem solving skills is the implementation of a specific teaching method. Consequences for education and future research are discussed.

  • 206.
    Bjurlid, Filip
    Örebro University, School of Science and Technology.
    Polybrominated dibenzo-p-dioxins and furans: from source of emission to human exposure2018Doctoral thesis, comprehensive summary (Other academic)
  • 207.
    Bjurlid, Filip
    et al.
    Örebro University, School of Science and Technology.
    Kärrman, Anna
    Örebro University, School of Science and Technology.
    Ricklund, Niklas
    Department of Occupational and Environmental Medicine, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Hagberg, Jessika
    Örebro University, School of Science and Technology. Department of Occupational and Environmental Medicine Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Occurrence of brominated dioxins in a study using various firefighting methods2017In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 599-600, 1213-1221 p.Article in journal (Refereed)
    Abstract [en]

    The use of different firefighting methods influences how fast a fire is extinguished and how fast the temperature drops in the area affected by the fire. These differences may also influence the formation of harmful pollutants during firefighting of an accidental fire. The aim was to study occurrence of brominated dibenzo-p-dioxins and furans (PBDD/Fs) in gas and soot during five fire scenarios resembling a small apartment fire and where different firefighting methods were used. Samples of gas and soot were taken both during the buildup of the fire and during the subsequent extinguishing of the fire while using different firefighting methods (nozzle, compressed air foam system, cutting extinguisher) and an extinguishing additive. New containers equipped with identical sets of combustible material were used for the five tests. The use of different firefighting methods and extinguishing additive induced variations in concentration and congener profiles of detected PBDD/Fs. The concentration range of Sigma PBDD/Fs in gas was 4020-18,700 pg/m(3), and in soot 76-4092 pg/m(2). PBDFs were the predominant congeners and 1,2,3,4,6,7,8-HpBDF was the most abundant congener. Chlorinated dibenzo-p-dioxins and furans (PCDD/Fs) were also monitored. The PBDD/Fs contributed with in average 97% to the total (PCDD/Fs plus PBDD/Fs) toxic equivalents, in soot and gas. During extinguishing, the shorter time the temperature was around 300 degrees C, the lower occurrence of PBDD/Fs. In the study the firefighting methods showed a difference in how effectively they induced a temperature decrease below 300 degrees C in the fire zone during quenching, where cutting extinguishing using additive and the compressed air foam system showed the fastest drop in temperature.

  • 208.
    Bjärnhall, Leila
    Örebro University, School of Science and Technology.
    Påverkan av sätthärdning på kugghjulets geometri2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The heat treatment of a gear takes place by case hardening. This is done in order to modify the tooth's physical and mechanical properties. The gear hardened surface will be abrasion resistant, while the tough core shows greater flexibility for transferring loads, such as torque moment. For reaching the desired characteristics, a gear, is heated in a carbon rich environment (hearth furnace) and is retained for a certain period. Immediately after leaving the oven the gear is subjected to a subsequent rapid cooling. These operations typically entail geometric deviations and deformations of the gear. Correction of these deviations will be difficult to achieve in afterward. It would involve high manufacturing costs. Today gear manufactures choose optimal manufacturing processes, in order to prevent or minimize these kind of geometric defects. So that the manufacturers can provide appropriate measures to compensate for these geometric errors, they must have sufficient knowledge of the deviated dimension. Knowing the pattern of deviation is the right way to be able to handle them. This thesis is written at Örebro University in cooperation with Meritor HVS in Lindesberg and treats geometrical deviations of a spur gear, affected by heat treatment, known as case hardening. The gear is also called Sun wheel and it is the core component of a planetary gear transmission system (as a part of a nave- reaction) which sits at the rear axle of heavy vehicle there, wheel is located. In this work, I have studied the gears geometric deviation of dimensional in shape, size and orientation, Figure 1. During comparison of data before and after the process of case hardening, a hypothetical deviation model was produced. The model can be significant for the sun gear production’s geometry change in general, affected by case hardening, and can be further used as the assessment of compensating solutions. Due to the difficulties in forming of a hardened surface of tooth, geometric correction as solution is implemented at earlier process stage. An example of this can be over dimensioning of gear that might turn shrinking in more advanced process stages. My solution in this thesis would be a solution that is implemented on an early process stage in a way of optimizing the manufacturing processes.

    Figure 1.

  • 209.
    Björk, Emelie
    Örebro University, School of Science and Technology.
    Isolation and Identification of Lactic Acid Bacteria in Certain Traditional Fermented Swedish Food2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 210.
    Björkbom, Carina
    et al.
    Laboratory of Aquatic Pathobiology, Environmental and Marine Biology, Department of Biosciences, Åbo Akademi University, Turku, Finland.
    Mustamäki, Noora
    Laboratory of Aquatic Pathobiology, Environmental and Marine Biology, Department of Biosciences, Åbo Akademi University, Turku, Finland.
    Olsson, Per-Erik
    Örebro University, School of Science and Technology.
    Katsiadaki, Ioanna
    Cefas Weymouth Laboratory, Weymouth, United Kingdom .
    Wiklund, Tom
    Laboratory of Aquatic Pathobiology, Environmental and Marine Biology, Department of Biosciences, Åbo Akademi University, Turku, Finland.
    Assessment of reproductive biomarkers in three-spined stickleback (Gasterosteus aculeatus) from sewage effluent recipients2013In: Environmental Toxicology, ISSN 1520-4081, E-ISSN 1522-7278, Vol. 28, no 4, 229-237 p.Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to examine the occurrence of endocrine disruption close to sewage treatment plant effluent discharges along the Finnish Baltic Sea coast using a set of reproductive biomarkers present in adult three-spined stickleback (Gasterosteus aculeatus). Possible variation and sensitivity of the biomarkers during an entire reproductive period were also examined. The analysis of vitellogenin (VTG) for estrogenic activity and spiggin for androgenic activity, together with histopathological analysis indicated that sticklebacks were exposed to estrogenic loads sufficient to cause inappropriate production of VTG and to disrupt normal testicular structure in adult male sticklebacks. No androgenic disruption was observed. The results emphasize the need of a combination of several reproductive biomarkers in fish and repeated sampling for the detection of potential endocrine modulating substances under field condition

  • 211.
    Björkegren, Joakim
    et al.
    Örebro University, School of Science and Technology.
    Stenberg, Björn
    Örebro University, School of Science and Technology.
    Utveckling av drivmekanism för automatiserad paletthantering2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a development project that deals with the transmission mechanism of pallets in robotic welding systems.

    Details to be welded are mounted on pallets. These are automatically transferred from a roller table to a workpiece positioner, holding the pallet in place during welding. The difficulty is due to the limited movements of the workpiece positioner. It is not always known what the customer wants to mount on the pallet. This limits the space available for the drive mechanism. The current system is built into the workpiece positioner. Increased competition has driven the need to reduce cost of the robotic welding systems. The drive mechanism for the pallets is an area where the company believes that costs can be cut.

    The report includes an idea generating process, development and simulation of a proposed solution to a design that replaces the current solution. The results section presents a solution proposal in the form of a conveyor which replaces both the current drive mechanism and one of the roller tables. Cost estimation is presented where the proposed solution is compared to today's solution.

  • 212.
    Björklund, Johanna
    Örebro University, School of Science and Technology.
    Framgångsrika recept för hållbara måltider i offentliga kök: Erfarenheter baserade på utvärderingen av projektet Hållbara måltider i Örebro län 2014-20162016Report (Other (popular science, discussion, etc.))
  • 213.
    Björklund, Johanna
    Örebro University, School of Science and Technology.
    Hållbara måltider i Örebro län 1.0: Ett bra exempel på lärande för hållbar utveckling2014Report (Other (popular science, discussion, etc.))
  • 214.
    Björklund, Johanna
    et al.
    Örebro University, School of Science and Technology.
    Eksvärd, Karin
    Inspire and action research ab.
    Schaffer, Christina
    Stockholms universitet, Stockholm,. Sverige.
    Assessing ecosystem services in perennial intercropping systems: participatory action research in Swedish modern agrofores2014In: Farming systems facing global challenges: Capacities and strategies / [ed] Schobert, H., Riecher, M.-C., Fischer, H. Aenis, T. & Knierim, 2014, 112-113 p.Conference paper (Other academic)
    Abstract [en]

    The focus of this paper is on how to assess ecosystem services in complex agroforestry systems using a case of edible forest gardens. Benefits of doing these assessments in a participatory learning and action research (PLAR) context are elaborated, as well as difficulties and questions that this has raised. The PLAR group comprised farmers on 13 smallholdings, researchers and a facilitator, which through collaboration and participatory methods have developed a general design of a forest garden, 60 m2 in size and established it on all 13 participating farms. Important values of the work are that ecosystem services are related to specific local contexts and that methodology for multi-criteria assessments of the generation of ecosystem services on a farm scale are being developed. Farmers engaged in formulating research questions, development of field trial designs, sampling and analysis of results improves the relevance and quality of the research as well as advance the adoption of new knowledge.

  • 215.
    Björklund, Johanna
    et al.
    Örebro University, School of Science and Technology.
    Johansson, Börje
    Hulta Norrgård, Linköping, Sweden.
    Assessing multifunctionality in relation to resource use: a holistic approach to measure efficiency, developed by participatory research2012In: Methods and procedures for building sustainable farming systems / [ed] Marta-Costa, A. A. & Soares da Silva, E. L. D. G, Dordrecht: Springer Netherlands, 2012, 161-173 p.Chapter in book (Refereed)
    Abstract [en]

    Today’s intensive agriculture needs to be transformed into sustainable production of food, and this process requires good tools that can assess whether an action is leading towards this in the long term. A critical issue is what optimal yield comprises in terms of other functions of agriculture, as higher yields might lead to e.g. a reduction in biodiversity or soil carbon. In this study, emergy analysis and footprinting were combined to assess and illustrate the total resource use caused by a farming activity (milk production) and to identify the renewable fraction of this resource use. The total efficiency was defined as a function of the resource use and the multifunctionality of production. The classification of ecosystem services in the Millennium Ecosystem Assessment (MA) was used as the basis for ranking multifunctionality. The results were expressed in the form of ecosystem bundles for the four MA categories (provisioning, supporting, regulating and cultural functions). Three scenarios with different degrees of input intensity and milk production were constructed and compared with the current production mode. The ratio of local renewable resource use to total resource use differed greatly between the different production strategies, being 1:3 for a self-sufficient organic farm and 1:14 for a conventional farm with maximum milk yield. Milk production was five-fold higher on the conventional farm, while generation of ecosystem services increased with increasing self-sufficiency under the local conditions prevailing in the study. Ecosystem services in all categories except provisioning were ranked higher when self-sufficiency increased.

  • 216.
    Björklund, Johanna
    et al.
    Örebro University, School of Science and Technology.
    Morfeldt, Peter
    Att använda skolmåltiden som pedagogiskt redskap: Erfarenheter från en forskningscirkel med lärare i åk 5-­62015Report (Other (popular science, discussion, etc.))
  • 217.
    Björklund, Sofie
    Örebro University, School of Science and Technology.
    Validation of a Cleanup Method for Analysis of Novel Brominated Flame Retardants in Biota Matrices Sofie Björklund 2015-05-30 Supervisors Ingrid Ericson2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Brominated flame retardants is a group of compounds present in numerous types of materials in our surroundings. Although their purpose is to slow the progression of a fire, many has been shown to be toxic to the environment. Novel brominated flame retardants have been introduced to the market as old ones have been removed. Reliable methods are crucial to be able to monitor how the novel brominated flame retardant spread and accumulate in the environment. To achieve this, a method validation of a cleanup method using multilayer silica followed by analysis by atmospheric pressure gas chromatography coupled to tandem mass spectroscopy was performed. This method had been previously used for polybrominated diphenyl ethers and the aim was to see if it could be used for analysis of novel brominated flame retardants as well. Spiking experiments showed generally good results, with recoveries of the native compound ranging from 40% to 174%.

    To apply the method on real matrix samples, eight samples of osprey eggs and five samples of adipose tissue of ringed seal was analyzed. Several novel brominated flame retardants were found, most abundant being the methoxylated polybrominated diphenyl ethers. Dominant congener was 2'-Methoxy-2,3',4,5'-tetrabromodiphenyl ether (2PMBDE#68) followed by 6-Methoxy-2,2',4,4'-tetrabromodiphenyl ether (6PMBDE#47), 5-Methoxy-2,2',4,4'-tetrabromodiphenyl ether (5PMBDE#47) and 5-Methoxy-2,2',4,4',6-pentabromodiphenyl ether (5PMBDE#100) with concentrations ranging from <0,13-13 ng/g lipid weight in osprey eggs and <0,003-249 ng/g lipid weight in ringed seal blubber. Also 1,2-Bis(2,4,6-tribromophenoxy)ethane and pentabromobenzene were found in both osprey eggs and ringed seal blubber. Hexabromobenzene was found in ringed seal blubber and 2,3,5,6-tetrabromo-p-xylene was identified in osprey eggs.

  • 218.
    Björnsdotter, Maria
    Örebro University, School of Science and Technology.
    Leaching of Residual Monomers, Oligomers and Additives from Polyethylene, Polypropylene, Polyvinyl Chloride, High-density Polyethylene and Polystyrene Virgin Plastics2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Plastic debris are accumulating in our oceans and are degraded into smaller pieces which eventually becomes small enough to be available to lower thropic level organisms. Microplastics, commonly defined as plastic particles <5 mm, are globally distributed and found at remote locations far away from industrialized and populated areas. The effects of macro sized plastics is well understood whilst the effects of microplastics is hard to predict. It is known that microplastics act as transfer vectors for a wide range of toxic chemicals into organisms, and it is also known that the particle itself can cause toxic responses such as increased immune response and endocrine disruption. Researchers utilize virgin plastic pellets in order to determine the toxicological effect of the plastic particle itself, but resent research suggest that these virgin plastics may release chemicals that contribute to the toxic response and thus complicates the interpretation of the results. In present study, five different virgin plastics were allowed to leach in artificial seawater under conditions that mimic those used in particle toxicity studies. Plastics included were polyethylene, polypropylene, polyvinyl chloride, high-density polyethylene and polystyrene. Leachable monomers and oligomers were found in three of the five plastics tested: polyvinyl chloride, high-density polyethylene and polystyrene. Leached compounds from polyvinyl chloride were not identified due to time limitations. Aliphatic hydrocarbons in the size C14-C22 were leached out from high-density polyethylene in the concentration range 0.47 × 10-3 – 1.13 × 10-3 μg ml-1 within 24 hours. Polystyrene was found to leach styrene monomer which reached a concentration of 0.17 μg ml-1 within 24 hours.

  • 219.
    Blanc, Mélanie
    et al.
    Örebro University, School of Science and Technology.
    Kärrman, Anna
    Örebro University, School of Science and Technology.
    Kukučka, Petr
    Örebro University, School of Science and Technology.
    Scherbak, Nikolai
    Örebro University, School of Science and Technology.
    Keiter, Steffen
    Örebro University, School of Science and Technology.
    Mixture-specific gene expression in zebrafish (Danio rerio) embryos exposed to perfluorooctane sulfonic acid (PFOS), perfluorohexanoic acid (PFHxA) and 3,3′,4,4′,5-pentachlorobiphenyl (PCB126)2017In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 590-591, 249-257 p.Article in journal (Refereed)
    Abstract [en]

    Perfluorooctane sulfonic acid (PFOS) and 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) are persistent organic pollutants of high concern because of their environmental persistence, bioaccumulation and toxic properties. Besides, the amphiphilic properties of fluorinated compounds such as PFOS and perfluorohexanoic acid (PFHxA) suggest a role in increasing cell membrane permeability and solubilizing chemicals. The present study aimed at investigating whether PFOS and PFHxA are capable of modifying the activation of PCB126 toxicity-related pathways. For this purpose, zebrafish embryos were exposed in semi-static conditions to 7.5 μg/L of PCB126 alone, in the presence of 25 mg/L of PFOS, 15.7 mg/L of PFHxA or in the presence of both PFOS and PFHxA. Quantitative PCR was performed on embryos aged from 24 h post fertilization (hpf) to 96 hpf to investigate expression changes of genes involved in metabolism of xenobiotics (ahr2, cyp1a), oxidative stress (gpx1a, tp53), lipids metabolism (acaa2, osbpl1a), and epigenetic mechanisms (dnmt1, dnmt3ba). Cyp1a and ahr2 expression were significantly induced by the presence of PCB126. However, after 72 and 78 h of exposure, induction of cyp1a expression was significantly lower when embryos were co-exposed to PCB126 + PFOS + PFHxA when compared to PCB126-exposed embryos. Significant upregulation of gpx1a occurred after exposure to PCB126 + PFHxA and to PCB126 + PFOS + PFHxA at 30 and 48 hpf. Besides, embryos appeared more sensitive to PCB126 + PFOS + PFHxA at 78 hpf: acaa2 and osbpl1a were significantly downregulated; dnmt1 was significantly upregulated. While presented as environmentally safe, PFHxA demonstrated that it could affect gene expression patterns in zebrafish embryos when combined to PFOS and PCB126, suggesting that such mixture may increase PCB126 toxicity. This is of particular relevance since PFHxA is persistent and still being ejected into the environment. Moreover, it provides additional information as to the importance to integrate mixture effects of chemicals in risk assessment and biomonitoring frameworks.

  • 220.
    Blanco, Jose Luis
    et al.
    University of Màlaga, Màlaga, Spain.
    Monroy, Javier G.
    University of Màlaga, Màlaga, Spain.
    Gonzalez-Jimenez, Javier
    University of Màlaga, Màlaga, Spain.
    Lilienthal, Achim J.
    Örebro University, School of Science and Technology.
    A Kalman Filter Based Approach To Probabilistic Gas Distribution Mapping2013Conference paper (Refereed)
    Abstract [en]

    Building a model of gas concentrations has important indus-trial and environmental applications, and mobile robots ontheir own or in cooperation with stationary sensors play animportant role in this task. Since an exact analytical de-scription of turbulent flow remains an intractable problem,we propose an approximate approach which not only esti-mates the concentrations but also their variances for eachlocation. Our point of view is that of sequential Bayesianestimation given a lattice of 2D cells treated as hidden vari-ables. We first discuss how a simple Kalman filter pro-vides a solution to the estimation problem. To overcomethe quadratic computational complexity with the mappedarea exhibited by a straighforward application of Kalmanfiltering, we introduce a sparse implementation which runsin constant time. Experimental results for a real robot vali-date the proposed method.

  • 221.
    Blom, Oskar
    et al.
    Örebro University, School of Science and Technology.
    Kovan, Novan
    Örebro University, School of Science and Technology.
    Implementering av ett bokningssystem med Google Calendar2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes the implementation of a booking system with the integration of Google Calendar API. The objective was primarily to evaluate the potential of a booking system where Google Calendar was used as schedules for staff. The project could also be used as a base system for customizing booking systems for different business models.

    The final system consisted of a website for making appointments, a Web API for communicating with the website, integration of Google Calendar API to retrieve and add appointments to the schedules of the staff and storing data in a database.

  • 222.
    Blom, Robin
    et al.
    Örebro University, School of Science and Technology.
    Dimberg, Mathias
    Örebro University, School of Science and Technology.
    Yatzy - Optimala spelstrategier2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats redogör för olika begrepp, metoder och beräkningar som är nödvändiga för att optimera sin spelstrategi i tärningsspelet Yatzy. De begrepp som tas upp i denna uppsats är bl.a. vad Markov-kedjor, sållprincipen och framför allt vad väntevärden är för något, och hur vi kan tillämpa dessa begrepp i spelet Yatzy. Metoderna som har använts när vi beräknat väntevärden kommer i många fall vara relativt likvärdiga, men vi kommer även att påvisa skiljaktigheter. Tanken med uppsatsen är att i varje situation som kan uppstå under spelets gång, kunna välja den spelstrategi som leder till så optimala förhållanden som möjligt.

  • 223.
    Blomberg, Tommy
    Örebro University, School of Science and Technology.
    Build Server Dashboard2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The development of large software projects often involves several developers that works on different parts of the code. Developers at Sigma Örebro follow a software engineering practice known as continuous integration. The main purpose with the continuous integration practice is to always keep the developing software in a working state.Thisreport covers my graduation work that I performed for Sigma Örebro.The assignment was to create a web based dashboard application that would displayinformation about the on-going projects at Sigma. For each project the dashboard should show the build time and test status for the latest checkedin builds. It would also calculate and display the overall success rate for each project and theamount of tests each project was subjected to. At last it would also display a graph that shows the amount of tests performed over time. The dashboard application should be fully automatedwithout the need of user interaction. All this information was to be presented as a single viewon a flat screen TV or monitor.

  • 224.
    Blomqvist, Edith
    et al.
    Örebro University, School of Science and Technology.
    Dahlgren, Katarina
    Örebro University, School of Science and Technology.
    Konceptframtagning av kontorsmöbel2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes the product development of office furniture. The thesis was executed within the engineering program of industrial design and product development at Örebro University.

    The project was an assignment from the company Nitton93. The firm is based in Örebro and provides store interior. After inquiry from their customers the firm started the development of a line of office furniture. Office furniture has looked basically the same for many years and Nitton93 wanted to change that through creating a line of office furniture for the future. The assignment was to develop a storage furniture for an office environment.

    This project began with pre-study containing information gathering of existing solutions, working environment, safety, ergonomics and use. After the pre-study an analysis was executed and from these two the demands and requests on the final product was set. Ideas were found in the phase of generating concept with the help of different methods and tools. Four concepts were chosen from these ideas and later evaluated.

    The chosen concept was developed further and the result was a storage furniture fitted for open offices. The size of the unit contributes to screening and lots of storage. The screening and the design of the furniture contributes to a calm working environment.

    The project extended to concept development, therefore the next step for the outsourcer was to produce production data. This thesis is well worked through and should form a good foundation for continued work with production and sale.

  • 225.
    Blomqvist, Emil
    Örebro University, School of Science and Technology.
    Konstruktion av lyftredskap2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report consists of the mechanical design of a lifting tool. The project was commissioned by ELE Engineering AB and carried out as part of the bachelor’s program in Mechanical engineering on Örebro University.

    ELE Engineering AB has received a request from a client to design a lifting tool that will remove the need for manual lifting of one of their components, the component is cylindrical and come in various sizes. This lifting tool need to be completely mechanical and adjustable by hand. The project was divided into separate stages in a similar way to the projects done previously in the university program. It starts with generating design concepts and then working its way to the producing of manufacturing plans and drawings.

    The result is a lifting tool that fulfils all the requirements and standards, only a handful of work is left until the project is lifting tool is completed and ready for manufacturing. These are to produce instructions for operation and maintenance to fulfil the requirements for CE marking, fabrication of a prototype for test lifting and a detailed cost analysis. The lifting tool consists of a beam onto which a lifting hook and a threaded rod is mounted. The threaded rod creates a sideways motion for two connected lifting arms when rotated and thus enabling adjustments to be made.

  • 226.
    Boberg, Ann-Sofie
    et al.
    Örebro University, School of Science and Technology.
    Ekelund, Johanna
    Örebro University, School of Science and Technology.
    Aritmetik: Undervisningsstrategier och räknestrategier2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to identify teaching strategies and counting strategies in addition and subtraction as previous research highlights. The study is designed as a systematic literature study and articles have been searched through the database Web of Science. The results show that earlier research highlights teaching through problem solving, digital tools, concrete materials and factorial teaching. Research that includes counting strategies shows that students use different counting strategies and that they go through different stages to find effective strategies to solve arithmetic operations. The conclusions of this is that there are several different types of teaching strategies. A variation of teaching strategies can help students to learn mathematics and arithmetic. It is important for the teacher to pay attention to what counting strategies students use to help them in their development of arithmetical skills. That’s because the students are using different types of counting strategies and goes through phases of developing the counting strategies.

  • 227.
    Boberg, Johanna B.
    et al.
    Swedish Univ Agr Sci, Uppsala BioCtr, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden.
    Finlay, Roger D.
    Swedish Univ Agr Sci, Uppsala BioCtr, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden.
    Stenlid, Jan
    Swedish Univ Agr Sci, Uppsala BioCtr, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden.
    Ekblad, Alf
    Örebro University, School of Science and Technology.
    Lindahl, Björn D.
    Swedish Univ Agr Sci, Uppsala BioCtr, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden.
    Nitrogen and Carbon Reallocation in Fungal Mycelia during Decomposition of Boreal Forest Litter2014In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, no 3, e92897- p.Article in journal (Refereed)
    Abstract [en]

    Boreal forests are characterized by spatially heterogeneous soils with low N availability. The decomposition of coniferous litter in these systems is primarily performed by basidiomycete fungi, which often form large mycelia with a well-developed capacity to reallocate resources spatially-an advantageous trait in heterogeneous environments. In axenic microcosm systems we tested whether fungi increase their biomass production by reallocating N between Pinus sylvestris (Scots pine) needles at different stages of decomposition. We estimated fungal biomass production by analysing the accumulation of the fungal cell wall compound chitin. Monospecific systems were compared with systems with interspecific interactions. We found that the fungi reallocated assimilated N and mycelial growth away from well-degraded litter towards fresh litter components. This redistribution was accompanied by reduced decomposition of older litter. Interconnection of substrates increased over-all fungal C use efficiency (i.e. the allocation of assimilated C to biomass rather than respiration), presumably by enabling fungal translocation of growth-limiting N to litter with higher C quality. Fungal connection between different substrates also restricted N-mineralization and production of dissolved organic N, suggesting that litter saprotrophs in boreal forest ecosystems primarily act to redistribute rather than release N. This spatial integration of different resource qualities was hindered by interspecific interactions, in which litters of contrasting quality were colonised by two different basidiomycete species. The experiments provide a detailed picture of how resource reallocation in two decomposer fungi leads to a more efficient utilisation of spatially separated resources under N-limitation. From an ecosystem point of view, such economic fungal behaviour could potentially contribute to organic matter accumulation in the litter layers of boreal forests.

  • 228.
    Bodin, Tomas
    Örebro University, School of Science and Technology.
    Dimensionering av två olika typer av träbroar2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna rapport dimensioneras två olika träbroar efter Eurokoderna. En med underspänning och en utan. Syftet var att jämföra konstruktionstyperna. Hjälpmedel för att åstadkomma detta var beräkningsprogrammet Rstab och Mathcad. Resultatet visade att vibrationer spelar en stor roll vid dimensioneringen. Plattan utan underspänning behövde vara två och en halv gånger så hög som den med underspänning för att klara vibrationskraven. Vilket medförde att den fick en låg utnyttjandegrad rörande hållfasthet. För bron med underspänning blev både hållfastheten och vibrationerna i stort sett lika avgörande vid dimensionering.

  • 229.
    Bodur, Sara
    et al.
    Örebro University, School of Science and Technology.
    Billinger, Petter
    Örebro University, School of Science and Technology.
    Design av AerosolTraps applikationshölje - Arbetsprocessen2013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    AerosolTrap AB has developed a filter-free system for particle separation in different flows like fluids and gases. This patented product is suitable for a variety of environments depending on the purpose. For example, the restaurant environment in which this application is called the "grease trap". This thesis is based on the design process needed to develop a casing for the restaurant application that shortly will be installed in the Scandic Grand Hotel kitchen in Örebro.

     

    The process includes a feasibility study in forms of interviews and basic research, as well as brainstorming and concept evaluation. Meetings were arranged with supervisors at the university and the AerosolTrap office to obtain constant feedback on our achievements. During the final phase of the project the opportunity to visit the Scandic Grand Hotel's restaurant kitchen was given. Thus an investigation could be done on whether any changes were needed before the final concept. Hand sketches, CAD models and edited images were used throughout the project to simply illustrate the esthetics, functions and materials.

     

    The result is consistent with the given requirements, and as a concept it leaves room for further development and adaptation.

  • 230.
    Bodén, Mattias
    et al.
    Örebro University, School of Science and Technology.
    Rakovic, Nandin
    Örebro University, School of Science and Technology.
    ChessCraft nätverk2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is describing the process for the development of the networking part of the game called ChessCraft. This game is submitted to the largest game developing contest in Scandinavia that goes under the name of Swedish Game Awards.

  • 231.
    Bodö, Linn
    Örebro University, School of Science and Technology.
    En skogsträdgårds potential att täcka en människas närings- och energibehov2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete är en del av ett deltagardrivet forskningsprojekt; Hållbar livsmedelsproduktion i Sverige – att odla och äta från perenna system. Projektet undersöker vilken potential agroforestry har att fungera för livsmedelsproduktion i Sverige. Dessa produktionssystem skulle vara ett bra komplement eller kunna ers.tta delar av dagens produktionssystem vilka medför ett flertal problem, bland annat negativa effekter på klimat och miljö. Skogsträdgårdar är en typ av agroforestry och utanför Höör i Skåne ligger Holma skogsträdgård. Den startades 2004 och är uppbyggd enligt permakulturs principer, som är en ansats för hållbara produktionsmetoder. Detta arbete är en fallstudie av örtlunden som är 200 m. och ligger i Holma skogsträdgård. Syftet var att undersöka om örtlunden har potential att täcka en människas närings- och energibehov under ett år. Frågeställningar som också behandlades var vilka näringsämnen och energigivare som kan komma att bli ett problem att uppnå om man lever på en kost av örtlundens växter. Fokus låg även på att undersöka hur man ska tillaga örtlundens växer för att ta tillvara på dess näringsämnen och energigivare.

    Metoden som användes var en litteraturgenomgång. Information samlades om örtlundens 29 växtarter, vilket resulterade i data om näringsinnehåll för 16 växter och data om energiinnehåll för 14 växter. övriga växtarter var alltför ovanliga för konsumtion och odling och saknade därför data, vilket ledde till att arbetet också presenterar var i växtens delar man sannolikt kan finna specifika näringsämnen och energigivare. Exempel anges också när man med fördel bör skörda växterna med hänsyn till dess närings- och energiinnehåll men generellt bör alla växer skördas på morgonen. För åtta av växterna hittades data om vad de kan avkasta. Ett flertal studier tar upp att skörd är något som varierar mycket på olika platser och i olika klimat så att mäta skörden direkt i örtlunden är därför något som bör göras i framtiden. Totalt var materialet för litet för att kunna svara fullständigt på frågeställningarna. Fem av örtlundens växter uppnådde fullständiga data från litteraturgenomgången och beräkning gjordes på hur mycket näring och energi dessa kan ge per planta. Växterna som beräknades var hassel (Corylus avellana), svarta vinbär (Ribes nigrum), krusbär (Ribes uva-crispa), päron (Pyrus communis) och hallon (Rubus idaeus). Tillsammans med övrigt material visar de att örtlunden har potentialen att kunna fungera för livsmedelsproduktion, även om alla näringsämnen och energigivare inte kan förses från örtlunden som den ser ut idag. Ett flertal närings.mnen exempelvis vitamin B12, jod, selen och zink kommer det sannolikt att kunna uppstå brist av om inte åtgärder vidtas. Protein och fett behöver också troligtvis ökas i örtlunden och också komma från fler källor om man ska kunna täcka en människas närings- och energibehov.

    Livsmedelsverket rekommenderar att dagligen äta 500 gram frukt och gönt. Av data som hittades om avkastning gjordes en beräkning på hur många dagar skogsträdgården kan förse en människa med 500 gram frukt och grönt. Skörd från päron (Pyrus communis), svarta vinbär (Ribes nigrum), bärhäggmispel (Amelanchier alnifolia), hallon (Rubus idaeus), mullbär (Morus accidosa) och krusbär (Ribes uva-crispa) ger en människa 500 gram dagligen i 404 dagar. De viktigaste växtarterna i örtlunden var hassel (Corylus avellana), löktrav (Alliaria petiolata), rosenkvitten (Chaenomeles japonica) samt svarta och röda vinbär (Ribes nigrum och rubrum). Detta för att de bidrar med speciellt viktig näring och energi, exempelvis jod från röda vinbär och fett i hasselnötter. För att ta till vara på så mycket som möjligt av växternas näring och energi ges förslag på hur dessa ska tillagas och hanteras, baserat på näringsämnenas och energigivarnas egenskaper. Resultatet blev att det mesta ska ätas färskt, utan tillagning, för att behålla näringsvärdet. Vissa växter bör tillagas för att kunna utnyttja dess protein och svårnedbrytbara kolhydrater till fullo och andra växter behöver tillagas för att minska halten av toxiska ämnen. På ett flertal plaster i världen är skogsträdgårdar en viktig källa till föda. Jämförelse gjordes med två andra skogsträdgårdar  om vad dessa kan avkasta och resultatet visade att en skogsträdgård i England kan avkasta i princip lika mycket som en skogsträdgård i Australien. skogsträdgården i England producerade från 2,6 upp till 3,3 kg mat per kvadratmeter och skogsträdgård i Australien 3,15 kg mat per kvadratmeter. Då England och Sverige har relativt likt klimat bekräftar detta potentialen av att skogsträdgårdar även fungerar bra i tempererat klimat.

  • 232. Bogdal, C.
    et al.
    Abad, E.
    Abalos, M.
    van Bavel, Bert
    Örebro University, School of Science and Technology.
    Hagberg, Jessika
    Örebro University, School of Science and Technology.
    Scheringer, M.
    Fiedler, Heidelore
    UNEP Chemicals, CH-1219 Châtelaine (GE), Switzerland.
    Worldwide distribution of persistent organic pollutants in air, including results of air monitoring by passive air sampling in five continents2013In: TrAC. Trends in analytical chemistry, ISSN 0165-9936, E-ISSN 1879-3142, Vol. 46, 150-161 p.Article in journal (Refereed)
    Abstract [en]

    This article provides an overview of concentrations of persistent organic pollutants (POPs) in ambient air on a global scale, including recent measurements and an extensive compilation of literature data. In this study, passive air samplers (PASs) were successfully employed to assess concentrations of POPs in ambient air from Africa, Latin America, the Caribbean, and the Pacific Islands. The project aimed to extend the knowledge on environmental contamination by POPs in these regions, where the currently available data are still limited to a few monitoring studies.

    The ambient air concentrations of PCB in Africa were relatively high when compared to other regions. Waste, in particular electronic waste, exported to Africa from industrialized countries may be a possible source of PCB in Africa, where PCB have never been extensively used or produced. For DDTs, the wide range of concentrations and particularly high levels in some countries of Africa and the Pacific Islands reflect the use of DDT for malaria control in these regions. For PCDD/PCDF, concentrations in Africa and Latin America are similar to or even higher than in Europe, probably due to unfavorable combustion practices of chlorine-containing materials.

    The data support the needs for further monitoring in developing countries and countries with economies in transition, and action to reduce environmental contamination by, and human exposure to, hazardous chemicals.

  • 233.
    Bonaccorsi, Manuele
    et al.
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Viale R. Piaggio, Pontedera, Italy.
    Fiorini, L
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Viale R. Piaggio, Pontedera, Italy.
    Sathyakeerthy, Subhash
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Cavallo, Filippo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Viale R. Piaggio, Pontedera, Italy.
    Dario, Paolo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Viale R. Piaggio, Pontedera, Italy.
    Design of cloud robotic services for senior citizens to improve independent living in multiple environments2015In: Intelligenza Artificiale, ISSN 1724-8035, Vol. 9, no 1, 63-72 p.Article in journal (Refereed)
    Abstract [en]

    The paper proposed a cloud robotic solution for the healthcare management of senior citizens, to demonstrate the opportunity to remotely provide continuous assistive robotic services to a number of seniors regardless to their position in the monitored environment. In particular, a medication reminding, a remote home monitoring and an user indoor localization service were outsourced in the cloud and provided to the robots, users and caregivers on request. The proposed system was composed of a number of robotic agents distributed over two smart environments: a flat at the Domocasa Lab (Peccioli, IT) and a condominium at the Angen site of the Orebro science park (Orebro, SE). The cloud acquired data from remote smart environments and enabled the local robots to provide advanced assistive services to a number of users. The proposed smart environments were able to collect raw data for the environmental monitoring and the localization of the users by means of wireless sensors, and provide such data to the cloud. On the cloud, specific algorithms improved the local robots, by providing event scheduling to accomplish assistive services and situation awareness on the users position and environments’ status. The indoor user localization service, was provided by means of commercial and ad-hoc sensors distributed over the environments and a sensor fusion algorithm on the cloud. The entire cloud solution was evaluated in terms of Quality of Service (QoS) to estimate the effectiveness of the architecture.

  • 234.
    Bonaccorsi, Manuele
    et al.
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Fiorini, Laura
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Cavallo, Filippo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Dario, Paolo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    A cloud robotics solution to improve social assistive robots for active and healthy aging2016In: International Journal of Social Robotics, ISSN 1875-4791, E-ISSN 1875-4805, Vol. 8, no 3, 393-408 p.Article in journal (Refereed)
    Abstract [en]

    Technological innovation in robotics and ICT represents an effective solution to tackle the challenge of providing social sustainable care services for the ageing population. The recent introduction of cloud technologies is opening new opportunities for the provisioning of advanced robotic services based on the cooperation of a number of connected robots, smart environments and devices improved by the huge cloud computational and storage capability. In this context, this paper aims to investigate and assess the potentialities of a cloud robotic system for the provisioning of assistive services for the promotion of active and healthy ageing. The system comprised two different smart environments, located in Italy and Sweden, where a service robot is connected to a cloud platform for the provisioning of localization based services to the users. The cloud robotic services were tested in the two realistic environments to assess the general feasibility of the solution and demonstrate the ability to provide assistive location based services in a multiple environment framework. The results confirmed the validity of the solution but also suggested a deeper investigation on the dependability of the communication technologies adopted in such kind of systems.

  • 235.
    Boo, Felicia
    Örebro University, School of Science and Technology.
    Analys av en produktionsprocess2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete har genomförts i syfte att analysera en process för en specifik produkt med mål att kunna framställa ett resultat som är ett slutkunskapsprov på programmet för högskoleingenjör inom industriell ekonomi vid Örebro Universitet.  Den tillverkande industrin drivs framåt över stora delar av världen, och allt fler aktörer dyker upp på marknaden. För att fortsatt vara konkurrenskraftig gäller det för företag att nyttja sina resurser och sin kunskap rätt, och eliminera slöseri i största möjliga mån. Detta examensarbete har haft till syfte att analysera en produktionsprocess gällande en viss produkt vid PartnerTech Karlskoga AB, för att vidare identifiera de slöserier som finns i flödet. Genom identifiering av slöserier lades förslag till hur dessa kan reduceras med mål att reducera genomloppstiden fram. Detta följs av en diskussion gällande värdering av de förslag som lagts fram på hur reducering av genomloppstiden kan uppnås, för att sedan avslutas med förslag till hur företaget vidare kan fortsätta arbetet efter avslutat examensarbete.

  • 236.
    Borg, Emelie
    et al.
    Örebro University, School of Science and Technology.
    Johansson, Johanna
    Örebro University, School of Science and Technology.
    Ranka den som Perron-Frobenius: Sporttabellen du aldrig sett förut2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsen är skriven för att ta fram ett alternativt sätt att ranka lag i olika serier. Vi har lagt störst fokus på fotbollsallsvenskan, men även tabellerna i fotbolls-EM, basketligan och elitserien i hockey kommer att jämföras. Vi kommer att introducera Perron-Frobenius sats med en kortare beskrivning och förklara hur Google använder satsen genom PageRank för att du ska kunna hitta just den artikel eller hemsida som du letar efter.

    Senare i uppsatsen beskriver hur vi använder Perron-Frobenius sats för att få fram en alternativ ranking till den som används idag. Därefter följer jämförelser och resultat av de olika metoderna. Vi undersöker dessutom om det med hjälp av det nya rankingsystemet blir lättare att förutse hur serien slutar.

    För att förstå alla matematiska begrepp och resonemang krävs Matematik B på universitet eller motsvarande. Med ett gediget sportintresse kan man ändå få ut något av att läsa uppsatsen men för att inte helt tappa intresset hoppa över kapitel 3. 

  • 237.
    Boström, Amanda
    Örebro University, School of Science and Technology.
    Data-Driven Pedestrian Simulation Using Conditional Transition Maps2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Pedestrian simulation is widely used in both the public and private sector for

    designing public spaces, when pedestrian behavior is central to the design. Recently,

    automated analysis of recorded data of actual pedestrians has emerged as

    a means of introducing empirical validation in the eld of pedestrian simulation.

    Conditional Transition Maps represent dynamic elements of an environment as

    transition probabilities and map them to discrete oor-elds. These maps have

    been previously used for mobile robot navigation. This thesis constitutes an

    investigation into the possibilites of using a CTMap as a basis for a pedestrian

    simulation model. The CTMap used in the thesis has been produced by analyzing

    recorded video data of actual pedestrians. A pedestrian model based on the

    CTMap was developed, using SeSAm, and compared to an already established

    pedestrian simulation model.

  • 238.
    Bouguerra, Abdelbaki
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Lars
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Handling uncertainty in semantic-knowledge based execution monitoring2007In: Intelligent Robots and Systems, 2007. IROS 2007. IEEE/RSJ International Conference on Oct. 29 2007-Nov. 2 2007, NEW YORK: IEEE , 2007, 443-449 p.Chapter in book (Other academic)
    Abstract [en]

    Executing plans by mobile robots, in real world environments, faces the challenging issues of uncertainty and environment dynamics. Thus, execution monitoring is needed to verify that plan actions are executed as expected. Semantic domain-knowledge has lately been proposed as a source of information to derive and monitor implicit expectations of executing actions. For instance, when a robot moves into a room asserted to be an office, it would expect to see a desk and a chair. We propose to extend the semantic knowledge-based execution monitoring to take uncertainty in actions and sensing into account when verifying the expectations derived from semantic knowledge. We consider symbolic probabilistic action models, and show how semantic knowledge is used together with a probabilistic sensing model in the monitoring process of such actions. Our approach is illustrated by showing test scenarios ran in an indoor environment using a mobile robot

  • 239.
    Boustedt, Katarina
    et al.
    Örebro University, School of Science and Technology.
    Persson, Katrin
    IMEGO, Gothenburg, Sweden.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Flip chip as an enabler for MEMS packaging2002In: 52nd Electronic Components and Technology Conference, 2002. Proceedings., 2002, -128 p.Conference paper (Refereed)
    Abstract [en]

    With the recent trends in microelectronics to move more and more towards incorporating MEMS (micro electro mechanical systems) structures, lowering the overall cost becomes vital. One major cost driver in today's MEMS is the packaging. Many of the MEMS structures require some level of low pressure for full quality operation, and some may even need vacuum to function properly. Different MEMS packaging strategies exist on the market and they can be divided into two different approaches. The first one protects the wafer temporarily during wafer scribing or dicing and the second one provides a permanent seal to the wafer through full wafer bonding before scribing and dicing. The latter, permanent methods allows for selecting very low cost packaging without hermeticity as a requirement, whereas in the temporary seal methods the seal is removed after dicing and the sensitive structures become unprotected again. Using flip chip for MEMS has the benefit of providing MEMS structures with a covering lid, the chip itself. A number of flip chip MEMS interconnection methods presented in literature are described.

  • 240.
    Boustedt, Katarina
    et al.
    Örebro University, School of Science and Technology.
    Persson, Katrin
    IMEGO, Gothenburg, Sweden.
    Stranneby, Dag
    Örebro University, School of Science and Technology.
    Bohman, Sofie
    IMEGO, Gothenburg, Sweden.
    Wafer Bonding Technologies for MEMS Packaging2002In: Proceedings : the IMAPS Nordic Annual Conference : Stockholm, 2002, 29 September-2 October 2002., 2002, -127 p.Conference paper (Other academic)
  • 241.
    Bowden, John A.
    et al.
    Marine Biochemical Sciences Group, Chemical Sciences Division, Hollings Marine Laboratory, National Institute of Standards and Technology, Charleston SC, USA.
    Hyötyläinen, Tuulia
    Örebro University, School of Science and Technology.
    Zhou, Senlin
    Department of Chemistry and Biochemistry, Wayne State University, Detroit MI, USA.
    Harmonizing Lipidomics: NIST Interlaboratory Comparison Exercise for Lipidomics using Standard Reference Material 1950 Metabolites in Frozen Human Plasma.2017In: Journal of Lipid Research, ISSN 0022-2275, E-ISSN 1539-7262, Vol. 58, no 12, 2275-2288 p.Article in journal (Refereed)
    Abstract [en]

    As the lipidomics field continues to advance, self-evaluation within the community is critical. Here, we performed an interlaboratory comparison exercise for lipidomics using Standard Reference Material (SRM) 1950 Metabolites in Frozen Human Plasma, a commercially available reference material. The interlaboratory study comprised 31 diverse laboratories, with each lab using a different lipidomics workflow. A total of 1527 unique lipids were measured across all laboratories, and consensus location estimates and associated uncertainties were determined for 339 of these lipids measured at the sum composition level by five or more participating laboratories. These evaluated lipids detected in SRM 1950 serve as community-wide benchmarks for intra- and inter-laboratory quality control and method validation. These analyses were performed using non-standardized laboratory-independent workflows. The consensus locations were also compared to a previous examination of SRM 1950 by the LIPID MAPS consortium. While the central theme of the interlaboratory study was to provide values to help harmonize lipids, lipid mediators, and precursor measurements across the community, it was also initiated to stimulate a discussion regarding areas in need of improvement.

  • 242.
    Broberg, Hanna
    et al.
    Örebro University, School of Science and Technology.
    Lybeck, Cristoffer
    Örebro University, School of Science and Technology.
    Framtagning av bockningsverktyg för C-profiler2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was performed in cooperation with Örebro Svets & Hydraulik AB, were the mission was to develop a bending tool adjusted för C-profiles.

    It takes a lot of knowledge about the different parameters that has an impact on the material to execute a successful bending operation. Factors that have an impact in a bending process are: wall thickness, dimensions and characteristics of the profile, method of bending and tooling. This project is focusing on the compression bending operation of C-profiles. In a compression bending operation the profile is drawn in between two dies, which are customized after the profile cross section and then locked to the workbench with a clamp. The moving die then forces the profile around the big die that is stuck in the workbench. In the bending operation both outside- and inside tensions occur.

    When Örebro Svets uses the ordinary compression bending machine the short ends on the C-profile is compressed towards the center of the beam in an unreliable way. The short ends overlap each other and they are difficult to control.

    The objective was to develop a concept basis for the production of the new bending templates. The project is based on a theoretical study of literature in conjunction and identification of the main problem. From the collected information a morphological matrix of partial solutions was made and a criterion weight analysis could be done. This all lead to the final concept, which was; new dies adjusted for the C-profile and a new clamp.

  • 243.
    Broxvall, Mathias
    et al.
    Örebro University, School of Science and Technology.
    Daoutis, Marios
    Örebro University, School of Science and Technology.
    Developing Medical Image Processing Algorithms for GPU assisted parallel computation2013In: Computer Vision in Medical Imaging / [ed] C H Chen, World Scientific, 2013, 245-270 p.Chapter in book (Refereed)
    Abstract [en]

    GPU’s have recently emerged as a significantly more powerful computing plat-form, capable of several orders of magnitude faster computations compared toCPU based approaches. However, they require significant changes in the algorithmic design compared to traditional programming paradigms. In this chapter we specifically introduce the reader to an overview of GPGPU development tools and the potential algorithmic pitfalls and bottlenecks when developing medical imaging algorithms for the GPU. We present a few general methodologies and building blocks for implementing fast image processing on GPUs. More specifically they include: methods for performing fast image convolutions and filtering;line detection, and bandwidth and memory considerations when processing volumetric datasets. Finally we conclude with a discourse on numerical precision as well as on mixing single floating-point versus double floating-point code.

  • 244.
    Broxvall, Mathias
    et al.
    Örebro University, School of Science and Technology. Centre of Biomedical Engineering Research (MTFC), Örebro University Hospital, Örebro, Sweden.
    Emilsson, Kent
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. epartment of Clinical Physiology, Örebro University Hospital, Örebro, Sweden.
    Thunberg, Per
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Department of Medical Physics and Centre of Biomedical Engineering Research (MTFC), Örebro University Hospital, Örebro, Sweden.
    Fast GPU based adaptive filtering of 4D echocardiography2012In: IEEE Transactions on Medical Imaging, ISSN 0278-0062, E-ISSN 1558-254X, Vol. 31, no 6, 1165-1172 p., 6099625Article in journal (Refereed)
    Abstract [en]

    Time resolved three-dimensional (3D) echocardiography generates four-dimensional (3D+time) data sets that bring new possibilities in clinical practice. Image quality of four-dimensional (4D) echocardiography is however regarded as poorer compared to conventional echocardiography where time-resolved 2D imaging is used. Advanced image processing filtering methods can be used to achieve image improvements but to the cost of heavy data processing. The recent development of graphics processing unit (GPUs) enables highly parallel general purpose computations, that considerably reduces the computational time of advanced image filtering methods. In this study multidimensional adaptive filtering of 4D echocardiography was performed using GPUs. Filtering was done using multiple kernels implemented in OpenCL (open computing language) working on multiple subsets of the data. Our results show a substantial speed increase of up to 74 times, resulting in a total filtering time less than 30 s on a common desktop. This implies that advanced adaptive image processing can be accomplished in conjunction with a clinical examination. Since the presented GPU processor method scales linearly with the number of processing elements, we expect it to continue scaling with the expected future increases in number of processing elements. This should be contrasted with the increases in data set sizes in the near future following the further improvements in ultrasound probes and measuring devices. It is concluded that GPUs facilitate the use of demanding adaptive image filtering techniques that in turn enhance 4D echocardiographic data sets. The presented general methodology of implementing parallelism using GPUs is also applicable for other medical modalities that generate multidimensional data.

  • 245.
    Broxvall, Mathias
    et al.
    Örebro University, School of Science and Technology.
    Loutfi, Amy
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Interacting with a robot ecology using task templates2007In: 2007 RO-MAN: 16TH IEEE INTERNATIONAL SYMPOSIUM ON ROBOT AND HUMAN INTERACTIVE COMMUNICATION, VOLS 1-3, NEW YORK: IEEE , 2007, 486-491 p.Chapter in book (Other academic)
    Abstract [en]

    Robot ecologies provide a new paradigm for assistive, service, industrial, and entertainment robotics which is quickly gaining popularity. These ecologies contain a large number of robotic components pervasively embedded in the environment and interacting with each other. Human users of such systems need to be able to interface with both the system as a whole and, if desired, which each individual component. The humans should be able to transmit, in a natural way, commands that range from basic ones, such as ''turn on the lights in the bedroom'', to abstract ones, such as ''bring me a cup of coffee''. Human users may also need to interact with task execution especially at decision points. In this paper, we introduce an approach to interface a human user to a specific type of robot ecology, called an ecology of Physically Embedded Intelligent Systems, or PEIS-Ecology. The ecology includes simple sensors and actuators and more complicated devices such as mobile robots. The proposed interface satisfies two requirements: 1) to easily and automatically generate component interfaces, and 2) to provide a simple mechanism by which to request and monitor the execution of tasks in the ecology.

  • 246.
    Bruno, Barbara
    et al.
    University of Genova, Genova, Italy.
    Chong, Nak Young
    Japan Advanced Institute of Science and Technology, Nomi, Ishikawa, Japan.
    Kamide, Hiroko
    Nagoya University, Nagoya, Japan.
    Kanoria, Sanjeev
    Advinia Health Care Limited LTD, London, UK.
    Lee, Jaeryoung
    Chubu University, Kasugai, Japan.
    Lim, Yuto
    Japan Advanced Institute of Science and Technology, Nomi, Ishikawa, Japan.
    Kumar Pandey, Amit
    SoftBank Robotics.
    Papadopoulos, Chris
    University of Bedfordshire, Luton, UK.
    Papadopoulos, Irena
    Middlesex University Higher Education Corporation, London, UK.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Sgorbissa, Antonio
    University of Genova, Genova, Italy.
    Paving the Way for Culturally Competent Robots: a Position Paper2017Conference paper (Refereed)
    Abstract [en]

    Cultural competence is a well known requirementfor an effective healthcare, widely investigated in thenursing literature. We claim that personal assistive robotsshould likewise be culturally competent, aware of generalcultural characteristics and of the different forms they take indifferent individuals, and sensitive to cultural differences whileperceiving, reasoning, and acting. Drawing inspiration fromexisting guidelines for culturally competent healthcare and thestate-of-the-art in culturally competent robotics, we identifythe key robot capabilities which enable culturally competentbehaviours and discuss methodologies for their developmentand evaluation.

  • 247.
    Bruno, Barbara
    et al.
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Grosinger, Jasmin
    Örebro University, School of Science and Technology.
    Mastrogiovanni, Fulvio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Sathyakeerthy, Subhash
    Örebro University, School of Science and Technology.
    Sgorbissa, Antonio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Multi-modal sensing for human activity recognition2015In: Proceedings of the 24th IEEE International Symposium on Robot and Human Interactive Communication, Kobe, Japan, Aug 31 - Sept 4, 2015, New York: IEEE conference proceedings , 2015, 594-600 p.Conference paper (Refereed)
    Abstract [en]

    Robots for the elderly are a particular category of home assistive robots, aiming at assisting the elderly inthe execution of daily life tasks to extend their independent life. To this aim, such robots should be able to determine the level of independence of the user and track its evolution over time, to adapt the assistance to the person capabilities and needs. Human Activity Recognition systems employ various sensing strategies, relying on environmental or wearable sensors,to recognize various daily life activities which provide insights on the health status of a person. The main contribution of the article is the design of an heterogeneous information management framework, allowing for the description of a wide variety of human activities in terms of multi-modal environmental and wearable sensing data and providing accurate knowledge about the user activity to any assistive robot.

  • 248.
    Bruno, Barbara
    et al.
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Mastrogiovanni, Fulvio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Sgorbissa, Antonio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    A framework for culture-aware robots based on fuzzy logic2017In: 2017 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE), Institute of Electrical and Electronics Engineers (IEEE), 2017Conference paper (Refereed)
    Abstract [en]

    Cultural adaptation, i.e., the matching of a robot's behaviours to the cultural norms and preferences of its user, is a well known key requirement for the success of any assistive application. However, culture-dependent robot behaviours are often implicitly set by designers, thus not allowing for an easy and automatic adaptation to different cultures. This paper presents a method for the design of culture-aware robots, that can automatically adapt their behaviour to conform to a given culture. We propose a mapping from cultural factors to related parameters of robot behaviours which relies on linguistic variables to encode heterogeneous cultural factors in a uniform formalism, and on fuzzy rules to encode qualitative relations among multiple variables. We illustrate the approach in two practical case studies.

  • 249.
    Bruno, Barbara
    et al.
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Mastrogiovanni, Fulvio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Sgorbissa, Antonio
    Department of Informatics, Bioengineering, Robotics and Systems Engineering, University of Genova, Genova, Italy.
    Using fuzzy logic to enhance classification of human motion primitives2014In: Information Processing and Management of Uncertainty in Knowledge-Based Systems: 15th International Conference, IPMU 2014, Montpellier, France, July 15-19, 2014, Proceedings, Part II / [ed] Laurent, A., Strauss, O., Bouchon-Meunier, B., Yager, R.R., Springer, 2014, 596-605 p.Chapter in book (Refereed)
    Abstract [en]

    The design of automated systems for the recognition of specific human activities is among the most promising research activities in Ambient Intelligence. The literature suggests the adoption of wearable devices, relying on acceleration information to model the activities of interest and distance metrics for the comparison of such models with the run-time data. Most current solutions do not explicitly model the uncertainty associated with the recognition, but rely on crisp thresholds and comparisons which introduce brittleness and inaccuracy in the system. We propose a framework for the recognition of simple activities in which recognition uncertainty is modelled using possibility distributions. We show that reasoning about this explicitly modelled uncertainty leads to a system with enhanced recognition accuracy and precision.

  • 250.
    Brus, Camilla
    Örebro University, School of Science and Technology.
    Techniques for Determining Alcohol Levels in Wine and Mulled Wine2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study is to in cooperation with Grythyttan Vin compare and evaluate the accuracy and precision of the Alcolyzer Wine. The Alcolyzer Wine is a Near Infrared based instrument that was compared to GC-FID, GC-MS and distillation. Samples were taken from cisterns at Grythyttan Vin along with finished product samples. These were then analysed using the mentioned analytical techniques. Multiple improvements can be made for the different techniques, such as use of internal standards. The relative standard deviations are higher than desired. Considering aspects such as precision, accuracy, cost, time consumption and user friendliness the preferred method of use is the Alcolyzer Wine. Even though it has limitations in the need to know sugar content it is the fastest and easiest instrument to use. Further studies have to be made to ensure the accuracy and precision of the GC-MS and the GC-FID.

2345678 201 - 250 of 1703
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf