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  • 301.
    Dandan, Kinan
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Ananiev, Anani
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Ivan, Kalaykov
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    SIRO: the silos surface cleaning robot concept2013Conference paper (Refereed)
    Abstract [en]

    A concept of a suspended robot for surface cleaning in silos is presented in this paper. The main requirements and limitations resulting from the specific operational conditions are discussed. Due to the large dimension of the silo as a confined space, specific kinematics of the robot manipulator is proposed. The major problems in its design are highlighted and an approach to resolve them is proposed. The suggested concept is a reasonable compromise between the basic contradicting factors in the design: small entrance and large surface of the confined space, suspension and stabilization of the robot

  • 302.
    Dandan, Kinan
    et al.
    Örebro University, School of Science and Technology.
    Ananiev, Anani
    Örebro University, School of Science and Technology.
    Kalaykov, Ivan
    School of Science and Technology, Örebro University, Örebro, Sweden.
    Dynamical Analysis of Silo Surface Cleaning Robot using Finite Element Method2016In: International Journal of Mechanical Engineering & Technology (IJMET), ISSN 0976-6340, Vol. 07, no 01, 190-202 p., IJMET_07_01_020Article in journal (Refereed)
    Abstract [en]

    All mechanical systems are subjected to dynamic forces when they are in functioning. Thus a dynamical analysis has to be studied to determine the system behaviour. The vibration is of interest to study, due to its destructive or constructive effect. In the present era computational techniques are quite common and are very reliable as far as the modal analysis is concerned. In this work, the robot of silo cleaning is analysed for its vibration behaviour using finite element method (FEM).The robot was modelled and meshed in ANSYS. Modal analysis was conducted to calculate few initial natural frequencies. After carrying out the modal analysis, harmonic and transient analysis were done to see the response of the robot under dynamic loading. It was observed that robot is safe in its entire range of operation.

  • 303.
    Dandan, Kinan
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Ananiev, Anani
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Kalaykov, Ivan
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Modeling and simulation of a silo cleaning robot2014In: Mobile Service Robotics / [ed] Krazystof Kotowski, Mohammad O Tokhi and Gurvinder S Virk, Singapore: World Scientific, 2014, 627-635 p.Conference paper (Refereed)
    Abstract [en]

    A suspended robot for surface cleaning in silos is presented in this paper. Thesuggested concept is a reasonable compromise between the basic contradictingfactors in the design: small entrance and large surface of the confined space,suspension and stabilization of the robot. A dynamic study for the suspendedrobot is presented in this paper. A dynamic simulation in MSC ADAMS iscarried out to confirm the results from the theoretic study.

  • 304.
    Daniel, Alberto
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    An Introduction to Invariant Theory2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This work is an attempt to explain in some detail section III D of the paper:

    N.J.A. Sloane. "Error-correcting codes and Invariant Theory:

    New application of a Nineteenth-Century Technique". For that, we will be concerned with polynomial invariants of  finite groups which come from a group action. We will introduce the basic notions of Invariant Theory to give an almost self-contained proof of Molien's theorem, and also present applications on linear codes.

  • 305.
    Danielsson, Linda
    et al.
    Örebro University, School of Science and Technology.
    Sternefors, Karin
    Örebro University, School of Science and Technology.
    Vad i undervisning genom problemlösning i grupp har forskning visat påverkar elevers matematiska förmågor?2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Problem solving within mathematics teaching has been more highlighted during the last decades. In the Swedish curriculum for primary school problem solving has got a bigger role, being one of five mathematical competencies that students should be given the chance to develop during school. In the Swedish curriculum there is also a focus on communication and how students should get the opportunity to engage in conversations and to reason about mathematics. This can be brought out by letting the students work together with their classmates in different kinds of group constellations. Problem solving in groups can be designed in different ways and affects the development of students’ mathematical competencies. In this systematic literature study three general themes were discovered, on how problem solving in groups can support students in developing their mathematical competencies; how problem solving can be designed, under a longer or shorter period of time, access to supporting structures and tools and the group constellation’s affect.

  • 306.
    Daoutis, Marios
    Örebro University, School of Science and Technology.
    Knowledge based perceptual anchoring: grounding percepts to concepts in cognitive robots2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    A successful articial cognitive agent needs to integrate its perception of the environment with reasoning and actuation. A key aspect of this integration is the perceptual-symbolic correspondence, which intends to give meaning to the concepts the agent refers to { known as Anchoring. However, perceptual representations alone (e.g., feature lists) cannot entirely provide sucient abstraction and enough richness to deal with the complex nature of the concepts' meanings. On the other hand, neither plain symbol manipulation appears capable of attributing the desired intrinsic meaning.

    We approach this integration in the context of cognitive robots which operate in the physical world. Specically we investigate the challenge of establishing the connection between percepts and concepts referring to objects, their relations and properties.We examine how knowledge representation can be used together with an anchoring framework, so as to complement the meaning of percepts while supporting linguistic interaction. This implies that robots need to represent both their perceptual and semantic knowledge, which is often expressed in dierent abstraction levels and may originate from dierent modalities.

    The solution proposed in this thesis concerns the specication, design and implementation ofa hybrid cognitive computational model, which extends a classical anchoring framework, in order to address the creation and maintenance of the perceptual-symbolic correspondences. The model is based on four main aspects: (a) robust perception, by relying on state-of-the art techniques from computer vision and mobile robot localisation; (b) symbol grounding, using topdown and bottom-up information acquisition processes as well as multi-modal representations; (c) knowledge representation and reasoning techniques in order to establish a common language and semantics regarding physical objects, their properties and relations, that are to be used between heterogeneous robotic agents and humans; and (d) commonsense information in order to enable high-level reasoning as well as to enhance the semantic

    descriptions of objects.

    The resulting system and the proposed integration has the potential to strengthen and expand the knowledge of a cognitive robot. Specically, by providing more robust percepts it is possible to cope better with the ambiguity and uncertainty of the perceptual data. In addition, the framework is able to exploit mutual interaction between dierent levels of representation while integrating dierent sources of information. By modelling and using semantic & perceptual knowledge, the robot can: acquire, exchange and reason formally about concepts, while prior knowledge can become a cognitive bias in the acquisition of novel concepts.

    List of papers
    1. Using Knowledge Representation for Perceptual Anchoring in a Robotic System
    Open this publication in new window or tab >>Using Knowledge Representation for Perceptual Anchoring in a Robotic System
    2008 (English)In: International Journal on Artificial Intelligence Tools, ISSN 0218-2130, Vol. 17, no 5, 925-944 p.Article in journal (Refereed) Published
    Abstract [en]

    In this work we introduce symbolic knowledge representation and reasoning capabilities to enrich perceptual anchoring. The idea that encompasses perceptual anchoring is the creation and maintenance of a connection between the symbolic and perceptual description that refer to the same object in the environment. In this work we further extend the symbolic layer by combining a knowledge representation and reasoning (KRR) system with the anchoring module to exploit a knowledge inference mechanisms. We implemented a prototype of this novel approach to explore through initial experimentation the advantages of integrating a symbolic knowledge system to the anchoring framework in the context of an intelligent home. Our results show that using the KRR we are better able to cope with ambiguities in the anchoring module through exploitation of human robot interaction.

    National Category
    Engineering and Technology Computer and Information Science
    Research subject
    Computer and Systems Science
    Identifiers
    urn:nbn:se:oru:diva-5175 (URN)
    Available from: 2009-02-24 Created: 2009-01-29 Last updated: 2017-10-18Bibliographically approved
    2. Grounding commonsense knowledge in intelligent systems
    Open this publication in new window or tab >>Grounding commonsense knowledge in intelligent systems
    2009 (English)In: Journal of Ambient Intelligence and Smart Environments, ISSN 1876-1364, E-ISSN 1876-1372, Vol. 1, no 4, 311-321 p.Article in journal (Refereed) Published
    Abstract [en]

    Ambient environments which integrate a number of sensing devices and actuators intended for use by human users need to be able to express knowledge about objects, their functions and their properties to assist in the performance of everyday tasks. For this to occur perceptual data must be grounded to symbolic information that in its turn can be used in the communication with the human. For symbolic information to be meaningful it should be part of a rich knowledge base that includes an ontology of concepts and common sense. In this work we present an integration between ResearchCyc and an anchoring framework that mediates the connection between the perceptual information in an intelligent home environment and the reasoning system. Through simple dialogues we validate how objects placed in the home environment are grounded by a network of sensors and made available to a larger KB where reasoning is exploited. This first integration work is a step towards integrating the richness of a KRR system developed over many years in isolation, with a physically embedded intelligent system.

    Place, publisher, year, edition, pages
    Amsterdam: IOS Press, 2009
    Keyword
    Physical Symbol Grounding, Commonsense Knowledge Representation, Human Robot Interaction, Intelligent Home
    National Category
    Computer Science
    Research subject
    Computer Science; Information technology
    Identifiers
    urn:nbn:se:oru:diva-8485 (URN)10.3233/AIS-2009-0040 (DOI)000207842000002 ()2-s2.0-78651496919 (Scopus ID)
    Available from: 2009-11-09 Created: 2009-11-09 Last updated: 2017-03-15Bibliographically approved
    3. Cooperative knowledge based perceptual anchoring
    Open this publication in new window or tab >>Cooperative knowledge based perceptual anchoring
    2012 (English)In: International journal on artificial intelligence tools, ISSN 0218-2130, Vol. 21, no 3, 1250012Article in journal (Refereed) Published
    Abstract [en]

    In settings where heterogenous robotic systems interact with humans, information from the environment must be systematically captured, organized and maintained in time. In this work, we propose a model for connecting perceptual information to semantic information in a multi-agent setting. In particular, we present semantic cooperative perceptual anchoring, that captures collectively acquired perceptual information and connects it to semantically expressed commonsense knowledge. We describe how we implemented the proposed model in a smart environment, using different modern perceptual and knowledge representation techniques. We present the results of the systemand investigate different scenarios in which we use the common sense together with perceptual knowledge, for communication, reasoning and exchange of information.

    Place, publisher, year, edition, pages
    World Scientific, 2012
    Keyword
    Cognitive robotics; physical symbol grounding; commonsense information; multi-agent perception; object recognition
    National Category
    Computer Science
    Research subject
    Computer and Systems Science
    Identifiers
    urn:nbn:se:oru:diva-24226 (URN)10.1142/S0218213012500121 (DOI)000305795900008 ()2-s2.0-84863086324 (Scopus ID)
    Funder
    Swedish Research Council
    Available from: 2012-08-06 Created: 2012-08-05 Last updated: 2017-02-16Bibliographically approved
    4. Towards concept anchoring for cognitive robots
    Open this publication in new window or tab >>Towards concept anchoring for cognitive robots
    2012 (English)In: Intelligent Service Robotics, ISSN 1861-2784, Vol. 5, no 4, 213-228 p.Article in journal (Refereed) Published
    Abstract [en]

    We present a model for anchoring categorical conceptual information which originates from physical perception and the web. The model is an extension of the anchoring framework which is used to create and maintain over time semantically grounded sensor information. Using the augmented anchoring framework that employs complex symbolic knowledge from a commonsense knowledge base, we attempt to ground and integrate symbolic and perceptual data that are available on the web. We introduce conceptual anchors which are representations of general, concrete conceptual terms. We show in an example scenario how conceptual anchors can be coherently integrated with perceptual anchors and commonsense information for the acquisition of novel concepts.

    Place, publisher, year, edition, pages
    Springer Berlin/Heidelberg, 2012
    Keyword
    Anchoring; Categorical perception; Near sets; Knowledge representation; Commonsense information
    National Category
    Robotics Computer Vision and Robotics (Autonomous Systems) Computer Science
    Research subject
    Computer Science
    Identifiers
    urn:nbn:se:oru:diva-26831 (URN)10.1007/s11370-012-0117-z (DOI)000208947900002 ()2-s2.0-84867580722 (Scopus ID)
    Funder
    Swedish Research Council
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2017-02-14Bibliographically approved
  • 307.
    Daoutis, Marios
    Örebro University, School of Science and Technology.
    Knowledge based perceptual anchoring: grounding percepts to concepts in cognitive robots2013In: Künstliche Intelligenz, ISSN 0933-1875, 1-4 p.Article in journal (Refereed)
    Abstract [en]

    Perceptual anchoring is the process of creating and maintaining a connection between the sensor data corresponding to a physical object and its symbolic description. It is a subset of the symbol grounding problem, introduced by Harnad (Phys. D, Nonlinear Phenom. 42(1–3):335–346, 1990) and investigated over the past years in several disciplines including robotics. This PhD dissertation focuses on a method for grounding sensor data of physical objects to the corresponding semantic descriptions, in the context of cognitive robots where the challenge is to establish the connection between percepts and concepts referring to objects, their relations and properties. We examine how knowledge representation can be used together with an anchoring framework, so as to complement the meaning of percepts while supporting better linguistic interaction with the use of the corresponding concepts. The proposed method addresses the need to represent and process both perceptual and semantic knowledge, often expressed in different abstraction levels, while originating from different modalities. We then focus on the integration of anchoring with a large scale knowledge base system and with perceptual routines. This integration is applied in a number of studies, where in the context of a smart home, several evaluations spanning from spatial and commonsense reasoning to linguistic interaction and concept acquisition.

  • 308.
    Daoutis, Marios
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Coradeschi, Silvia
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Loutfi, Amy
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Cooperative knowledge based perceptual anchoring2012In: International journal on artificial intelligence tools, ISSN 0218-2130, Vol. 21, no 3, 1250012Article in journal (Refereed)
    Abstract [en]

    In settings where heterogenous robotic systems interact with humans, information from the environment must be systematically captured, organized and maintained in time. In this work, we propose a model for connecting perceptual information to semantic information in a multi-agent setting. In particular, we present semantic cooperative perceptual anchoring, that captures collectively acquired perceptual information and connects it to semantically expressed commonsense knowledge. We describe how we implemented the proposed model in a smart environment, using different modern perceptual and knowledge representation techniques. We present the results of the systemand investigate different scenarios in which we use the common sense together with perceptual knowledge, for communication, reasoning and exchange of information.

  • 309.
    Daoutis, Marios
    et al.
    Örebro University, School of Science and Technology.
    Coradeschi, Silvia
    Örebro University, School of Science and Technology.
    Loutfi, Amy
    Örebro University, School of Science and Technology.
    Knowledge representation for anchoring symbolic concepts to perceptual data2012In: Bridges between the Methodological and Practical Work of the Robotics and Cognitive Systems Communities - From Sensors to Concepts / [ed] Springet Publishing, Springer Publishing Company, 2012Chapter in book (Refereed)
  • 310.
    Daoutis, Marios
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Coradeschi, Silvia
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Loutfi, Amy
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Towards concept anchoring for cognitive robots2012In: Intelligent Service Robotics, ISSN 1861-2784, Vol. 5, no 4, 213-228 p.Article in journal (Refereed)
    Abstract [en]

    We present a model for anchoring categorical conceptual information which originates from physical perception and the web. The model is an extension of the anchoring framework which is used to create and maintain over time semantically grounded sensor information. Using the augmented anchoring framework that employs complex symbolic knowledge from a commonsense knowledge base, we attempt to ground and integrate symbolic and perceptual data that are available on the web. We introduce conceptual anchors which are representations of general, concrete conceptual terms. We show in an example scenario how conceptual anchors can be coherently integrated with perceptual anchors and commonsense information for the acquisition of novel concepts.

  • 311.
    Daoutis, Marios
    et al.
    Örebro University, School of Science and Technology.
    Mavridis, Nikolaos
    Towards a Model for Grounding Semantic Composition2014Conference paper (Refereed)
  • 312.
    Dashti, HesamAddin T.
    et al.
    School of Math and Computer Science, University of Tehran.
    Aghaeepour, NimaSchool of Math and Computer Science, University of Tehran.Asadi, SaharÖrebro University, School of Science and Technology.Bastani, MeysamSchool of Math and Computer Science, University of Tehran.Delafkar, ZahraSchool of Math and Computer Science, University of Tehran.Disfani, Fatemeh M.School of Math and Computer Science, University of Tehran.Ghaderi, Serveh M.School of Math and Computer Science, University of Tehran.Kamali, ShahinSchool of Math and Computer Science, University of Tehran.Pashami, SepidehÖrebro University, School of Science and Technology.Siahpirani, Alireza F.School of Math and Computer Science, University of Tehran.
    Dynamic Positioning based on Voronoi Cells (DPVC)2006Collection (editor) (Refereed)
    Abstract [en]

    In this paper we are proposing an approach for flexible positioning of players in Soccer Simulation in a Multi-Agent environment. We introduce Dynamic Positioning based on Voronoi Cells (DPVC) as a new method for players' positioning which uses Voronoi Diagram for distributing agents in the field. This method also uses Attraction Vectors that indicate agents' tendency to specific objects in the field with regard to the game situation and players' roles. Finally DPVC is compared with SBSP as the conventional method of positioning.

  • 313.
    Dashto, Ramin
    et al.
    Örebro University, School of Science and Technology.
    Abduljabar, Foras
    Örebro University, School of Science and Technology.
    Automatisera handsvetsning samt reducering av oxidering vid svetsning2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study of welding process for stainless steel sinks made at Intra Mölntorp AB. The company is a market leader in the production of sinks and sanitary equipment in stainless steel. The aim is to carry out a feasibility study to automate the corner welding of sinks with special dimensions and to reduce oxidation at the corner welding.

    Hand welding is used today for large sinks that does not fit in the robot cell where the company welds their standard sinks, as the larger benches require more space than is available in current robotic cell. There is not time in the robot cell to weld also the approximately 5 000 special sinks produced each year.

    By developing a manual hand welding to automated welding company can reduce the production time for each sink while increasing work safety. Two proposals have been prepared for how a new cell benches with special dimensions can look.

    Finally, a new model of the gas nozzle was developed. The cover serves to protect the weld area from oxygen penetrating into and discolour the surfaces being heated up. The new cap provides better protection against oxygen than the previous cap was used, and it is made of a heat-resistant material while it can be easily manufactured in more copies. There remains some work to investigate the causes of discoloration, since both temperature, cooling time and shielding gas concentration affect discoloration.The discoloration can not be eliminated only with the cover design.

    The company Mölntorp AB has two possible solution concept that can facilitate the production to decide and to work further with the gas nozzle where the causes of discoloration closer needs to be investigated.

  • 314.
    Davidsson, Jonas
    Örebro University, School of Science and Technology.
    Bestämning av bruttotemperaturexpansionskoefficient för Faradol 8102013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis was carried out at ABB Power Products/Instrument Transformers in Ludvika. The purpose of the work has been to examine the thermal expansion for an isolating oil that is used in the product Capacitor Voltage Transformer (CVT). The oil’s own expansion coefficient                          was already known, but the purpose of the work was to determine a gross thermal expansion coefficient, with other words to examine the amount of influense the other componets had on the volume expansion inside the unit.

    To decide the gross thermal expansion coefficient a test has been carried out in a climat chamer. To performe the test two aluminum tanks, each with a measurement tube mounted on the top were used. One of the tanks was filled with oil and the other one was filled with oil and capacitor contents corresponding tio the contents in a CVT. The two test objects were then exposed to temperatures reaching from -60°C to 65°C in steps of 10°C. During this time a number of volume measurements were performed on the two test objects. These measure­ments together with a few correction parameters were used to decide the thermal expansion coefficient for both the oil (only for control purpose) and the capacitor contents. Together these two gives the gross thermal expansion coefficient for all posible volume combinations.

    The results from the tests has been analised and visualised in the form of tables an diagrams. After that the thermal expansion coefficient for the oil and the capacitorcontents, for different temperatures was calculated. Bult on those calculations the avarege thermal expansion coeff­icient for the temperatureintervals was calculated, and finaly an modle for calculating the gross thermal expansion coefficient was created. At the end conclusions were drawn from the results. 

  • 315.
    Dawes, Melissa A.
    et al.
    Mountain Ecosystems, WSL Institute for Snow and Avalanche Research-SLF, Davos Dorf, Switzerland .
    Hagedorn, Frank
    Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), , Birmensdorf, Switzerland .
    Handa, Ira Tanya
    Université du Québec à Montréal (UQÀM), Montreal, Canada .
    Streit, Kathrin
    Paul Scherrer Institute, Villigen, Switzerland .
    Ekblad, Alf
    Örebro University, School of Science and Technology.
    Rixen, Christian
    Mountain Ecosystems, WSL Institute for Snow and Avalanche Research-SLF, Davos Dorf, Switzerland .
    Körner, Christian
    University of Basel, Basel, Switzerland .
    Hättenschwiler, Stephan
    Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Montpellier, France.
    An alpine treeline in a carbon dioxide-rich world: synthesis of a nine-year free-air carbon dioxide enrichment study2013In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 171, no 3, 623-637 p.Article in journal (Refereed)
    Abstract [en]

    We evaluated the impacts of elevated CO2 in a treeline ecosystem in the Swiss Alps in a 9-year free-air CO2 enrichment (FACE) study. We present new data and synthesize plant and soil results from the entire experimental period. Light-saturated photosynthesis (A max) of ca. 35-year-old Larix decidua and Pinus uncinata was stimulated by elevated CO2 throughout the experiment. Slight down-regulation of photosynthesis in Pinus was consistent with starch accumulation in needle tissue. Above-ground growth responses differed between tree species, with a 33 % mean annual stimulation in Larix but no response in Pinus. Species-specific CO2 responses also occurred for abundant dwarf shrub species in the understorey, where Vaccinium myrtillus showed a sustained shoot growth enhancement (+11 %) that was not apparent for Vaccinium gaultherioides or Empetrum hermaphroditum. Below ground, CO2 enrichment did not stimulate fine root or mycorrhizal mycelium growth, but increased CO2 effluxes from the soil (+24 %) indicated that enhanced C assimilation was partially offset by greater respiratory losses. The dissolved organic C (DOC) concentration in soil solutions was consistently higher under elevated CO2 (+14 %), suggesting accelerated soil organic matter turnover. CO2 enrichment hardly affected the C–N balance in plants and soil, with unaltered soil total or mineral N concentrations and little impact on plant leaf N concentration or the stable N isotope ratio. Sustained differences in plant species growth responses suggest future shifts in species composition with atmospheric change. Consistently increased C fixation, soil respiration and DOC production over 9 years of CO2 enrichment provide clear evidence for accelerated C cycling with no apparent consequences on the N cycle in this treeline ecosystem.

  • 316.
    Deckmyn, G.
    et al.
    Univ Antwerp, Antwerp, Belgium.
    Meyer, A.
    Univ Gothenburg, Dept Biol & Environm Sci, Gothenburg, Sweden.
    Smits, M. M.
    Hasselt Univ, Ctr Environm Sci, Diepenbeek, Belgium.
    Ekblad, Alf
    Örebro University, School of Science and Technology.
    Grebenc, T.
    Slovenian Forestry Inst, Ljubljana, Slovenia.
    Komarov, A.
    Russian Acad Sci, Inst Physicochem & Biol Problems Soil Sci, Pushchino, Moscow Region, Russia.
    Kraigher, H.
    Slovenian Forestry Inst, Ljubljana, Slovenia.
    Simulating ectomycorrhizal fungi and their role in carbon and nitrogen cycling in forest ecosystems2014In: Canadian Journal of Forest Research, ISSN 0045-5067, Vol. 44, no 6, 535-553 p.Article, review/survey (Refereed)
    Abstract [en]

    Although ectomycorrhizal fungi play an important role in forest ecosystem functioning, they are usually not included in forest growth or ecosystem models. Simulation is hampered by two main issues: a lack of understanding of the ecological functioning of the ectomycorrhizal fungi and a lack of adequate basic data for parameterization and validation. Concerning these issues, much progress has been made during the past few years, but this information has not found its way into the forest and soil models. In this paper, state-of-the-art insight into ectomycorrhizal functioning and basic values are described in a manner transparent to nonspecialists and modelers, together with the existing models and model strategies. As such, this paper can be the starting point and the motivator to include ectomycorrhizal fungi into existing soil and forest ecosystem models.

  • 317.
    DELAHAYE, QUENTIN
    Örebro University, School of Science and Technology.
    Framework for Classical Conditioning in a MobileRobot: Development of Pavlovian Model andDevelopment of Reinforcement Learning Algorithmto Avoid and Predict Noxious Events2014Student paper other, 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays, robots have more and more sensors and the technologies allow

    using them with less contraints as before. Sensors are important to learn about

    the environment. But the sensors can be used for classical conditioning, and

    create behavior for the robot. One of the behavior developed in this thesis is

    avoiding and predicting obstacles.

    The goal of this thesis is to propose a model which consists of developing a

    specific behavior to avoid noxious event, obstacles.

  • 318.
    Demirel, Isak
    et al.
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Kinnunen, Annica
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Önnberg, Anna
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Department of Laboratory Medicine, Clinical Microbiology, Örebro University Hospital, Örebro, Sweden.
    Söderquist, Bo
    Örebro University, School of Medicine, Örebro University, Sweden. Orebro University Hospital. Department of Laboratory Medicine, Clinical Microbiology.
    Persson, Katarina
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    Comparison of host response mechanisms evoked by extended spectrum beta lactamase (ESBL)- and non-ESBL-producing uropathogenic E. coli2013In: BMC Microbiology, ISSN 1471-2180, E-ISSN 1471-2180, Vol. 13, 181Article in journal (Refereed)
    Abstract [en]

    Background: Infections caused by extended spectrum beta-lactamases (ESBL)-producing bacteria have been emerging worldwide and the majority of ESBL-producing E. coli strains are isolated from patients with urinary tracts infections. The purpose of this study was to compare the host-response mechanisms in human polymorphonucleated leukocytes (PMN) and renal epithelial cells when stimulated by ESBL-or non-ESBL-producing uropathogenic E. coli (UPEC) isolates. The host-pathogen interaction of these ESBL-producing strains in the urinary tract is not well studied.

    Results: The ability of ESBL strains to evoke ROS-production from PMN cells was significantly higher than that of the non-ESBL strains. The growth of ESBL strains was slightly suppressed in the presence of PMN compared to non-ESBL strains after 30 min and 2 h, but the opposite was observed after 5 and 6 h. The number of migrating PMN was significantly higher in response to ESBL strains compared to non-ESBL strains. Stimulation of A498 cells with ESBL strains elicited lower production of IL-6 and IL-8 compared to non-ESBL strains.

    Conclusion: Significant differences in host-response mechanisms were identified when host cells were stimulated by ESBL-or non-ESBL producing strains. The obtained results on the early interactions of ESBL-producing strains with the host immune system may provide valuable information for management of these infections.

  • 319.
    Dessne, Karin
    Örebro University, School of Science and Technology.
    Supporting knowledge management with information technology: the significance of formal and informal structures2012Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Knowledge Management (KM) is a relatively young field of research. It has traditionally aimed at managing work in organisations often by the assistance of supporting Information Technology (IT).

    In this thesis, the definition of KM is expressed as facilitating the intertwined process of learning and knowing in an organisation. in order to support this process by IT KM needs to be based on an understanding of the significance of the formal and informal structures that organisations are built on. Using the word knowing rather than knowledge assists in approaching the issue of how to facilitate learning and knowing, since it declares knowing as a process or as a state of mind. This process feeds on what is available in the form of nourishment, which is supplied in the form of information. KM then has two ways of supporting learning and knowing: by nourishing and by encouraging this process.

    Two analysis frameworks were constructed from two subsequent literature reviews of KM, Computer Supported Collaborative Work/Lerarning (CSCW/CSCL), and Communities of Practice (CoP). These models were used to describe and analyse the learning process of the selected case, a Swedish military organisation. It soon became evident that the formal learning process did not work as intended, and that the informal structures and processes struggled to accomplish the results that the formal process failed to deliver. The formal and informal processes were not aligned and neither worked satisfyingly. Informal structures exists within formal structures and they are both equally important. They are intertwined and dependent on each other. as the findings of this case study has revealed.

    In supporting learning and knowing in organisations, IT needs to support both formal and informal structures. IT could nourish structures and processes, and IT could encourage participation and interaction in them. As learning is based on interaction supporting it is vital, but at the same time, no interaction will occur without nourishment. These are the impĺications for IT when designing for learning and knowing in organisations. It is not only a matter of supplying and making information available, but also of encouraging interaction in aligned formal and informal structures.

  • 320.
    Di Lello, Enrico
    et al.
    Katholieke Univ Leuven, Div PMA, Dept Mech Engn, Heverlee, Belgium.
    Trincavelli, Marco
    Örebro University, School of Science and Technology, Örebro University, Sweden. Centre for Applied Autonomous Sensor Systems, Örebro University, Örebro, Sweden;.
    Bruyninckx, Herman
    Katholieke Univ Leuven, Div PMA, Dept Mech Engn, Heverlee, Belgium; Eindhoven Univ Technol, Sect CST, Dept Mech Engn, Eindhoven, Netherlands .
    De laet, Tinne
    Katholieke Univ Leuven, Fac Engn Sci, Heverlee, Belgium.
    Augmented Switching Linear Dynamical System Model for Gas Concentration Estimation with MOX Sensors in an Open Sampling System2014In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 14, no 7, 12533-12559 p.Article in journal (Refereed)
    Abstract [en]

    In this paper, we introduce a Bayesian time series model approach for gas concentration estimation using Metal Oxide (MOX) sensors in Open Sampling System (OSS). Our approach focuses on the compensation of the slow response of MOX sensors, while concurrently solving the problem of estimating the gas concentration in OSS. The proposed Augmented Switching Linear System model allows to include all the sources of uncertainty arising at each step of the problem in a single coherent probabilistic formulation. In particular, the problem of detecting on-line the current sensor dynamical regime and estimating the underlying gas concentration under environmental disturbances and noisy measurements is formulated and solved as a statistical inference problem. Our model improves, with respect to the state of the art, where system modeling approaches have been already introduced, but only provided an indirect relative measures proportional to the gas concentration and the problem of modeling uncertainty was ignored. Our approach is validated experimentally and the performances in terms of speed of and quality of the gas concentration estimation are compared with the ones obtained using a photo-ionization detector.

  • 321.
    Di Mauro, Alessio
    et al.
    DTU Compute, Technical University of Denmark, Denmark.
    Dragoni, Nicola
    Örebro University, School of Science and Technology. DTU Compute, Technical University of Denmark, Denmark.
    Adaptive Multipath Key Reinforcement for Energy Harvesting Wireless Sensor Networks2015In: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 63, 48-55 p.Article in journal (Refereed)
    Abstract [en]

    Energy Harvesting - Wireless Sensor Networks (EH-WSNs) constitute systems of networked sensing nodes that are capable of extracting energy from the environment and that use the harvested energy to operate in a sustainable state. Sustainability, seen as design goal, has a significant impact on the design of the security protocols for such networks, as the nodes have to adapt and optimize their behaviour accordingto the available energy. Traditional key management schemes do not take energy into account, making them not suitable for EH-WSNs. In this paper we propose a new multipath key reinforcement scheme specifically designed for EH-WSNs. The proposed scheme allows each node to take into consideration and adapt to the amount of energy available in the system.In particular, we present two approaches, one static and one fully dynamic, and we discuss some experimental results.

  • 322.
    Di Mauro, Alessio
    et al.
    DTU Compute, Technical University of Denmark, Lyngby, Denmark .
    Fafoutis, Xenofon
    Department of Electrical and Electronic Engineering, University of Bristol, Woodland Road, Bristol, United Kingdom.
    Dragoni, Nicola
    Örebro University, School of Science and Technology.
    Adaptive security in ODMAC for multihop energy harvesting wireless sensor networks2015In: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477, 760302Article in journal (Refereed)
    Abstract [en]

    Energy Harvesting Wireless Sensor Networks (EH-WSNs) represent an interesting new paradigm where individual nodes forming a network are powered by energy sources scavenged from the surrounding environment. This technique provides numerous advantages, but also new design challenges. Securing the communications under energy constraints represents one of these key challenges. The amount of energy available is theoretically infinite in the long run but highly variable over short periods of time, and managing it is a crucial aspect. In this paper we present an adaptive approach for security in multihop EH-WSNs which allows different nodes to dynamically choose the most appropriate energy-affecting parameters such as encryption algorithm and key size, providing in this way energy savings. In order to provide evidence of the approach's feasibility in a real-world network, we have designed and implemented it as extension of on-demand medium access control (ODMAC), a receiver-initiated (RI) MAC protocol specifically designed and developed to address the foundational energy-related needs of Energy Harvesting Wireless Sensor Networks.

  • 323.
    Di Paolo, Carolina
    et al.
    Institute for Environmental Research, RWTH Aachen University, Aachen, Germany.
    Ottermanns, Richard
    Institute for Environmental Research, RWTH Aachen University, Aachen, GermanyWTH Aachen University, Aachen, Germany.
    Keiter, Steffen
    Örebro University, School of Science and Technology. Institute for Environmental Research, RWTH Aachen University, Aachen, Germany.
    Ait-Aissa, Selim
    INERIS, Verneuil-en-Halatte, France.
    Bluhm, Kerstin
    Institute for Environmental Research, RWTH Aachen University, Aachen, Germany.
    Brack, Werner
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
    Breitholtz, Magnus
    Department of Applied Environmental Science - ITM, Stockholm University, Stockholm, Sweden.
    Buchinger, Sebastian
    Department Biochemistry and Ecotoxicology, Federal Institute of Hydrology, Koblenz, Germany.
    Carere, Mario
    Italian Institute of Health, Rome, Italy.
    Chalon, Carole
    ISSeP (Scienti fi c Institute of Public Service), Liège, Wallonia, Belgium.
    Cousin, Xavier
    Laboratoire d'Ecotoxicologie, Ifremer, L'Houmeau, France; Laboratoire de Physiologie et Génétique des Poissons, Inra, Rennes, France.
    Dulio, Valeria
    INERIS, Verneuil-en-Halatte, France.
    Escher, Beate
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany; National Research Centre for Environmental Toxicology - Entox, The University of Queensland, Brisbane, Australia; Centre for Applied Geosciences, Eberhard Karls University Tübingen, Germany.
    Hamers, Timo
    Institute for Environmental Studies -IVM, VU University Amsterdam, The Netherlands.
    Hilscherová, Klara
    Research Centre for Toxic Compounds in the Environment - RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.
    Jarque, Sergio
    Research Centre for Toxic Compounds in the Environment - RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.
    Jonas, Adam
    Research Centre for Toxic Compounds in the Environment - RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.
    Maillot-Marechal, Emmanuelle
    INERIS, Verneuil-en-Halatte, France.
    Marneffe, Yves
    ISSeP (Scienti fi c Institute of Public Service), Liège, Wallonia, Belgium.
    Nguyen, Mai Thao
    Waterproef Laboratory, Edam, The Netherlands.
    Pandard, Pascal
    INERIS, Verneuil-en-Halatte, France.
    Schifferli, Andrea
    Swiss Centre for Applied Ecotoxicology Eawag-EPFL, Dübendorf, Switzerland.
    Schulze, Tobias
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
    Seidensticker, Sven
    Institute for Environmental Research, RWTH Aachen University, Aachen, Germany; Laboratoire d'Ecotoxicologie, Ifremer, L'Houmeau, France.
    Seiler, Thomas B.
    Institute for Environmental Research, RWTH Aachen University, Aachen, Germany.
    Tang, Janet
    National Research Centre for Environmental Toxicology - Entox, The University of Queensland, Brisbane, Australia.
    van der Oost, Ron
    WATERNET Institute for the Urban Water Cycle, Division of Technology Research & Engineering, Amsterdam, The Netherlands.
    Vermeirssen, Etienne
    Swiss Centre for Applied Ecotoxicology Eawag-EPFL, Dübendorf, Switzerland.
    Zounková, Radka
    Research Centre for Toxic Compounds in the Environment - RECETOX, Faculty of Science, Masaryk University, Brno, Czech Republic.
    Zwart, Nick
    Institute for Environmental Studies -IVM, VU University Amsterdam, The Netherlands.
    Hollert, Henner
    Institute for Environmental Research, RWTH Aachen University, Aachen, Germany.
    Bioassay battery interlaboratory investigation of emerging contaminants in spikedwater extracts: Towards the implementation of bioanalytical monitoring tools inwater quality assessment and monitoring2016In: Water Research, ISSN 0043-1354, Vol. 104, 473-484 p.Article in journal (Refereed)
    Abstract [en]

    Bioassays are particularly useful tools to link the chemical and ecological assessments in water quality monitoring. Different methods cover a broad range of toxicity mechanisms in diverse organisms, and account for risks posed by non-target compounds and mixtures. Many tests are already applied in chemical and waste assessments, and stakeholders from the science-police interface have recommended their integration in regulatory water quality monitoring. Still, there is a need to address bioassay suitability to evaluate water samples containing emerging pollutants, which are a current priority in water quality monitoring. The presented interlaboratory study (ILS) verified whether a battery of miniaturized bioassays, conducted in 11 different laboratories following their own protocols, would produce comparable results when applied to evaluate blinded samples consisting of a pristine water extract spiked with four emerging pollutants as single chemicals or mixtures, i.e. triclosan, acridine, 17α-ethinylestradiol (EE2) and 3-nitrobenzanthrone (3-NBA). Assays evaluated effects on aquatic organisms from three different trophic levels (algae, daphnids, zebrafish embryos) and mechanism-specific effects using in vitro estrogenicity (ER-Luc, YES) and mutagenicity (Ames fluctuation) assays. The test battery presented complementary sensitivity and specificity to evaluate the different blinded water extract spikes. Aquatic organisms differed in terms of sensitivity to triclosan (algae > daphnids > fish) and acridine (fish > daphnids > algae) spikes, confirming the complementary role of the three taxa for water quality assessment. Estrogenicity and mutagenicity assays identified with high precision the respective mechanism-specific effects of spikes even when non-specific toxicity occurred in mixture. For estrogenicity, although differences were observed between assays and models, EE2 spike relative induction EC50 values were comparable to the literature, and E2/EE2 equivalency factors reliably reflected the sample content. In the Ames, strong revertant induction occurred following 3-NBA spike incubation with the TA98 strain, which was of lower magnitude after metabolic transformation and when compared to TA100. Differences in experimental protocols, model organisms, and data analysis can be sources of variation, indicating that respective harmonized standard procedures should be followed when implementing bioassays in water monitoring. Together with other ongoing activities for the validation of a basic bioassay battery, the present study is an important step towards the implementation of bioanalytical monitoring tools in water quality assessment and monitoring.

  • 324.
    Di Paolo, Carolina
    et al.
    Department of Ecosystem Analysis, Institute for Environmental Research, ABBt - Aachen Biology and Biotechnology, RWTH Aachen University, Aachen, Germany.
    Seiler, Thomas B.
    Department of Ecosystem Analysis, Institute for Environmental Research, ABBt - Aachen Biology and Biotechnology, RWTH Aachen University, Aachen, Germany.
    Keiter, Steffen
    Örebro University, School of Science and Technology. Department of Ecosystem Analysis, Institute for Environmental Research, ABBt - Aachen Biology and Biotechnology, RWTH Aachen University, Aachen, Germany.
    Hu, Meng
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
    Muz, Melis
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
    Brack, Werner
    UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany.
    Hollert, Henner
    Department of Ecosystem Analysis, Institute for Environmental Research, ABBt - Aachen Biology and Biotechnology, RWTH Aachen University, Aachen, Germany; College of Resources and Environmental Science, Chongqing University, Beibei, Chongqing, China; College of Environmental Science and Engineering and State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China.
    The value of zebrafish as an integrative model in effect-directed analysis: a review2015In: Environmental Sciences Europe, ISSN 2190-4715, E-ISSN 2190-4715, Vol. 27, no 8, 1-11 p.Article in journal (Refereed)
    Abstract [en]

    Bioassays play a central role in effect-directed analysis (EDA), and their selection and application have to consider rather specific aspects of this approach. Meanwhile, bioassays with zebrafish, an established model organism in different research areas, are increasingly being utilized in EDA. Aiming to contribute for the optimal application of zebrafish bioassays in EDA, this review provides a critical overview of previous EDA investigations that applied zebrafish bioassays, discusses the potential contribution of such methods for EDA and proposes strategies to improve future studies. Over the last 10 years, zebrafish bioassays have guided EDA of natural products and environmental samples. The great majority of studies performed bioassays with embryos and early larvae, which allowed small-scale and low-volume experimental setups, minimized sample use and reduced workload. Biotesting strategies applied zebrafish bioassays as either the only method guiding EDA or instead integrated into multiple bioassay approaches. Furthermore, tiered biotesting applied zebrafish methods in both screening phase as well as for further investigations. For dosing, most of the studies performed solvent exchange of extracts and fractions to dimethyl sulfoxide (DMSO) as carrier. However, high DMSO concentrations were required for the testing of complex matrix extracts, indicating that future studies might benefit from the evaluation of alternative carrier solvents or passive dosing. Surprisingly, only a few studies reported the evaluation of process blanks, indicating a need to improve and standardize methods for blank preparation and biotesting. Regarding evaluated endpoints, while acute toxicity brought limited information, the assessment of specific endpoints was of strong value for bioactivity identification. Therefore, the bioassay specificity and sensitivity to identify the investigated bioactivity are important criteria in EDA. Additionally, it might be necessary to characterize the most adequate exposure windows and assessment setups for bioactivity identification. Finally, a great advantage of zebrafish bioassays in EDA of environmental samples is the availability of mechanism- and endpoint-specific methods for the identification of important classes of contaminants. The evaluation of mechanism-specific endpoints in EDA is considered to be a promising strategy to facilitate the integration of EDA into weight-of-evidence approaches, ultimately contributing for the identification of environmental contaminants causing bioassay and ecological effects.

  • 325.
    Di Rocco, Maurizio
    et al.
    Örebro University, School of Science and Technology. Roma Tre University, Rome, Italy.
    La Gala, Francesco
    INSEAN, Rome, Italy.
    Ulivi, Giovanni
    Roma Tre University, Rome, Italy.
    Testing Multirobot Algorithms: SAETTA: A Small and Cheap Mobile Unit2013In: IEEE robotics & automation magazine, ISSN 1070-9932, Vol. 20, no 2, 52-62 p.Article in journal (Other academic)
  • 326.
    Di Rocco, Maurizio
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Pecora, Federico
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    When Robots are Late: Configuration Planning for Multiple Robots with Dynamic Goals2013Conference paper (Refereed)
    Abstract [en]

    Unexpected contingencies in robot execution may induce a cascade of effects, especially when multiple robots are involved. In order to effectively adapt to this, robots need the ability to reason along multiple dimensions at execution time. We propose an approach to closed-loop planning capable of generating configuration plans, i.e., action plans for multirobot systems which specify the causal, temporal, resource and information dependencies between individual sensing, computation, and actuation components. The key feature which enables closed loop performance is that configuration plans are represented as constraint networks, which are shared between the planner and the executor and are continuously updated during execution.We report experiments run both in simulation and on real robots, in which a fault in one robot is compensated through different types of planmodifications at run time.

  • 327.
    Di Rocco, Maurizio
    et al.
    Örebro University, School of Science and Technology.
    Pecora, Federico
    Örebro University, School of Science and Technology.
    Sivakumar, Prasanna Kumar
    Örebro University, School of Science and Technology.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Configuration Planning with Multiple Dynamic Goals2013In: Designing intelligent robots: reintegrating AI II. Papers from the AAAI Spring Symposium, AAAI Press, 2013, 12-17 p.Conference paper (Refereed)
    Abstract [en]

    We propose an approach to configuration planning for robotic systems in which plans are represented as constraint networks and planning is defined as search in the space of such networks. The approach supports reasoning about time, resources, and information dependencies between actions. In addition, the system can leverage the flexibility of such networks at execution time to support dynamic goal posting and re-planning.

  • 328.
    Di Rocco, Maurizio
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Sathyakeerthy, Subhash
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Grosinger, Jasmin
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Pecora, Federico
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Bonaccorsi, Manuele
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Cavallo, Filippo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Limosani, Raffaele
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Manzi, Alessandro
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    Teti, Giancarlo
    Robotech srl, Italy. Association for the Advancement of Artificial Intelligence.
    Dario, Paolo
    The BioRobotics Institute, Scuola Superiore Sant’Anna, Pisa, Italy.
    A Planner for Ambient Assisted Living:From High-Level Reasoning to Low-Level Robot Execution and Back2014In: Papers from the AAAI Spring Symposium, AAAI Press, 2014Conference paper (Refereed)
    Abstract [en]

    Robot ecologies are a growing paradigm in which oneor several robotic systems are integrated into a smartenvironment. Robotic ecologies hold great promises forelderly assistance. Planning the activities of these systems,however, is not trivial, and requires considerationof issues like temporal and information dependenciesamong different parts of the ecology, exogenous actions,and multiple, dynamic goals. We describe a plannerable to cope with the above challenges. We showin particular how this planner has been incorporatedin closed-loop into a full robotic system that performsdaily tasks in support of elderly people. The full robotecology is deployed in a test apartment inside a real residentialbuilding, and it is currently undergoing an extensiveuser evaluation.

  • 329.
    Dlugosz, A.
    et al.
    Karolinska Institutet, Department of Medicine and Center for Digestive Diseases, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    Nowak, P.
    Karolinska Institutet, Department of Medicine, Unit of Infectious Diseases, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    D'Amato, M.
    Karolinska Institutet, Department of Biosciences and Nutrition, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    Mohammadian Kermani, G.
    Karolinska Institutet, Department of Medicine and Center for Digestive Diseases, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    Nyström, J.
    Karolinska Institutet, Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    Abdurahman, Samir
    Örebro University, School of Science and Technology.
    Lindberg, G.
    Karolinska Institutet, Department of Medicine and Center for Digestive Diseases, Karolinska University Hospital, Huddinge, Stockholm, Sweden.
    Increased serum levels of lipopolysaccharide and antiflagellin antibodies in patients with diarrhea-predominant irritable bowel syndrome2015In: Neurogastroenterology and Motility, ISSN 1350-1925, E-ISSN 1365-2982, Vol. 27, no 12, 1747-1754 p.Article in journal (Refereed)
    Abstract [en]

    Background: Innate immune responses to conserved microbial products such as lipopolysaccharide (LPS) and flagellin are likely important in microbial-host interactions and intestinal homeostasis. We hypothesized that bacterial translocation and activation of mucosal immunity against common microbial antigens might be involved in the development of irritable bowel syndrome (IBS). We therefore compared serum levels of LPS, soluble CD14 (sCD14), and flagellin antibodies between patients with different subtypes of IBS and healthy controls.

    Methods: We analyzed serum obtained from 88 patients (74 females) aged 19(43)-73 years and 106 healthy volunteers (77 females) aged 19(38)-62 years. Diarrhea-predominant IBS (D-IBS) was present in 32 patients (36%), 23 patients (26%) had constipation-predominant IBS (C-IBS), and 33 patients (38%) had A-IBS. We used ELISA for sCD14 and antiflagellin immunoglobulin G and limulus amebocyte assay for LPS. Abdominal symptoms and psychiatric comorbidities were assessed using validated questionnaires.

    Key Results: We found a significantly higher serum level of LPS in patients with D-IBS compared to controls (p = 0.0155). The level of antibodies to flagellin was higher in patients with IBS than in controls (mainly driven by higher levels in D-IBS, p = 0.0018). The levels of sCD14 were lower in D-IBS patients compared to controls (p = 0.0498). We found a weak, but significant correlation between the levels of antiflagellin antibodies and anxiety among IBS patients ( = 0.38; p = 0.0045).

    Conclusions & Inferences: Our results support the concept that immune reactivity to luminal antigens may have a role in the development of D-IBS. The serum level of antiflagellin antibodies was found to correlate with patients' self-reported anxiety score.

  • 330.
    Domander, Johan
    Örebro University, School of Science and Technology.
    Dungeon Runner: A Geolocalisation Exer Game2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In today's society one of the biggest health issues is the lack of physical activity. With

    increased physical activity the risk of getting a number of diseases, including various type of

    cancer is decreased. This project explore the possibility when using mobile devices with GPS

    localisation capability to make exercise games that are fun and rewarding and in the process

    increasing the physical activity of the player. The project also explore different methods of

    detecting what mode of transportation are used. The result of the project is an Android

    application consisting of three parts, the first part is a tower defence game to play. The second

    part are a training exercise where the player can walk or run to earn rewards that can be used

    to play the tower defence, the last part are a detection system that will limit the player from

    using a motorized vehicle while exercising. In future development of similar applications,

    machined learned AI could be introduces for the motorized detection system to make even

    more rewarding exercise games.

  • 331. Domingo, Jose L.
    et al.
    Ericson Jogsten, Ingrid
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Eriksson, Ulrika
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Martorell, Isabel
    Perello, Gemma
    Nadal, Marti
    van Bavel, Bert
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Human dietary exposure to perfluoroalkyl substances in Catalonia, Spain: temporal trend2012In: Food Chemistry, ISSN 0308-8146, E-ISSN 1873-7072, Vol. 135, no 3, 1575-1582 p.Article in journal (Refereed)
    Abstract [en]

    In this study, we assessed the levels of 18 perfluoroalkyl substances (PFASs) in the most widely consumed foodstuffs in Catalonia, Spain, as well as the total dietary intake of these compounds. Forty food items were analysed. Only perfluoropentanoic acid (PFPeA), perfluorohexadecanoic acid (PFHxDA) and perfluorooctanoicdecanoic acid (PFOcDA) were not detected in any sample. Perfluorooctane sulfonate (PFOS) was the compound found in the highest number of samples (33 out of 80), followed by perfluorooctanoic acid (PFOA), perfluoroheptanoic acid (PFHpA), perfluorohexane sulfonic acid (PFHxS), perfluorodecanoic acid (PFDA) and perfluorodecane sulfonic acid (PFDS). Fish and shellfish was the food group in which more PFASs were detected and where the highest PFAS concentrations were found. The highest dietary intakes corresponded to children, followed by male seniors, with values of 1787 and 1466 ng/day, respectively. For any of the age/gender groups of the population, the Tolerable Daily Intakes (TDIs) recommended by the EFSA were not exceeded. In general terms, PFAS levels found in the current study are lower than the concentrations recently reported in other countries.

  • 332. Domingo, Jose L.
    et al.
    Ericson-Jogsten, Ingrid
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Perello, Gemma
    Nadal, Marti
    van Bavel, Bert
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Kärrman, Anna
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Human exposure to perfluorinated compounds in Catalonia, Spain: contribution of drinking water and fish and shellfish2012In: Journal of Agricultural and Food Chemistry, ISSN 0021-8561, E-ISSN 1520-5118, Vol. 60, no 17, 4408-4415 p.Article in journal (Refereed)
    Abstract [en]

    In this study, the concentrations of 15 perfluorinated compounds (PFCs) were analyzed in 30 water samples collected in Catalonia (Spain) at three stages of the drinking water treatment process in several water purification plants. In addition, the concentrations of 13 PFCs were determined in samples of fish and shellfish collected from coastal areas of Catalonia. The intake of PFCs through both pathways, drinking water intake and fish and shellfish consumption, was also estimated. In water samples, the highest mean concentrations corresponded to perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) (1.81 and 2.40 ng/L, respectively), whereas perfluorodecanosulfonate (PFDS) and perfluorotetradecanoic acid (PFTDA) were under their respective limits of detection in all analyzed samples. The results show that although the current treatment processes caused slight reductions in PFC concentrations, these processes did not mean significant changes in the amounts of PFCs already contained in the raw water. Among the analyzed PFCs in fish and shellfish, only seven compounds could be detected in at least one composite sample. PFOS showed the highest mean concentration (2.70 ng/g fw), being detected in all species with the exception of mussels. With regard to PFOA (mean, 0.074 ng/g fw), the highest concentrations were detected in prawn and hake (0.098 and 0.091 ng/g fw, respectively). The current exposure to PFCs through consumption of fish and shellfish indicates that it should not be of concern for the consumers. The amounts ingested are well below the recommended tolerable daily intakes, at least for those PFCs for which information is available.

  • 333.
    Dragone, Mauro
    et al.
    University College Dublin, Dublin, Ireland.
    Abdel-Naby, Sameh
    University College Dublin, Dublin, Ireland.
    Swords, David
    University College Dublin, Dublin, Ireland.
    O'Hare, Gregory M.P.
    University College Dublin, Dublin, Ireland.
    Broxvall, Mathias
    Örebro University, School of Science and Technology.
    A Programming Framework for Multi-agent Coordination of Robotic Ecologies2013In: Programming Multi-Agent Systems: 10th International Workshop, ProMAS 2012, Valencia, Spain, June 5, 2012, Revised Selected Papers / [ed] Mehdi Dastani, Jomi F. Hübner, Brian Logan, Springer Publishing Company, 2013, 72-89 p.Conference paper (Refereed)
    Abstract [en]

    Building smart environments with Robotic ecologies, comprising of distributed sensors, actuators and mobile robot devices facilitates and extends the nature and form of smart environments that can be developed, and reduces the complexity and cost of such solutions. While the potentials of such an approach makes robotic ecologies increasingly popular, many fundamental research questions remain open. One such question is how to make a robotic ecology self-adaptive, so as to adapt to changing conditions and evolving requirements, and consequently reduce the amount of preparation and pre-programming required for their deployment in real world applications. This paper presents a framework for the specification and the programming of robotic ecologies. The framework extends an existing agent system and integrates it with the pre-existing and dominant traditional robotic and middleware approach to the development of robotic ecologies. We illustrate how these technologies complement each other and offer a candidate technology to pursue adaptive robotic ecologies.

  • 334.
    Dragone, Mauro
    et al.
    Trinity College Dublin, Dublin, Ireland.
    Amato, Giuseppe
    ISTI-CNR, Pisa, Italy.
    Bacciu, Davide
    Università di Pisa, Pisa, Italy.
    Chessa, Stefano
    Università di Pisa, Pisa, Italy.
    Coleman, Sonya
    University of Ulster, Derry, United Kingdom.
    Di Rocco, Maurizio
    Örebro University, School of Science and Technology.
    Gallicchio, Claudio
    Università di Pisa, Pisa, Italy.
    Gennaro, Claudio
    ISTI-CNR, Pisa, Italy.
    Lozano, Hector
    Tecnalia, Bilbao, Spain.
    Maguire, Liam
    University of Ulster, Derry, United Kingdom.
    McGinnity, Martin
    University of Ulster, Derry, United Kingdom.
    Micheli, Alessio
    Università di Pisa, Pisa, Italy.
    O'Hare, Gregory M. P.
    University College Dublin, Ireland.
    Renteria, Arantxa
    Tecnalia, Bilbao, Spain.
    Saffiotti, Alessandro
    Örebro University, School of Science and Technology.
    Vairo, Claudio
    ISTI-CNR, Pisa, Italy.
    Vance, Philip
    University of Ulster, Derry, United Kingdom.
    A cognitive robotic ecology approach to self-configuring and evolving AAL systems2015In: Engineering applications of artificial intelligence, ISSN 0952-1976, E-ISSN 1873-6769, Vol. 45, 269-280 p.Article in journal (Refereed)
    Abstract [en]

    Robotic ecologies are systems made out of several robotic devices, including mobile robots, wireless sensors and effectors embedded in everyday environments, where they cooperate to achieve complex tasks. This paper demonstrates how endowing robotic ecologies with information processing algorithms such as perception, learning, planning, and novelty detection can make these systems able to deliver modular, flexible, manageable and dependable Ambient Assisted Living (AAL) solutions. Specifically, we show how the integrated and self-organising cognitive solutions implemented within the EU project RUBICON (Robotic UBIquitous Cognitive Network) can reduce the need of costly pre-programming and maintenance of robotic ecologies. We illustrate how these solutions can be harnessed to (i) deliver a range of assistive services by coordinating the sensing & acting capabilities of heterogeneous devices, (ii) adapt and tune the overall behaviour of the ecology to the preferences and behaviour of its inhabitants, and also (iii) deal with novel events, due to the occurrence of new user's activities and changing user's habits.

  • 335.
    Driankov, Dimiter
    et al.
    Örebro University, School of Science and Technology.
    Hellendoorn, Hans
    Siemens AG Corporate Research and Development Dept., ZFE ST SN 4 81730 Munich, Germany .
    Chaining of fuzzy IF-THEN rules in Mamdani-controllers1995In: Proceedings of 1995 IEEE International conference on fuzzy systems, Vols I-IV. / [ed] IEEE, IEEE conference proceedings, 1995, 103-108 p.Conference paper (Refereed)
    Abstract [en]

    The problem of chaining of fuzzy IF-THEN rules has so far received a rather theoretic treatment in the literature on approximate reasoning. In particular, different types of composition operators, fuzzy implication operators, etc., have been identified such that the conclusion obtained via a chain of fuzzy rules coincides with the conclusion derived from the “abbreviated” version of the same chain. This “abbreviated” version is a single fuzzy rule which the rule-antecedent is the rule-antecedent of the first rule in the chain, and its rule-consequent is the rule-consequent of the last rule in the chain. However, in the case of more than one chain of rules and when the fuzzy sets defining the meaning of the rule-antecedents and rule-consequents from different chains overlap, then the above theoretical results do not hold in general. In the present paper we identify two major problems with the chaining of fuzzy rules in the case of more than one chain and overlapping rule-antecedents and rule-consequents that belong to different chains

  • 336.
    Driankov, Dimiter
    et al.
    Örebro University, School of Science and Technology.
    Hellendoorn,, Hans
    Siemens AG Corporate Research and Development, Otto-Hahn-Ring 6 81730 Munich, Germany .
    Palm, Reiner
    Siemens AG Corporate Research and Development, Otto-Hahn-Ring 6 81730 Munich, Germany .
    Fuzzy control with fuzzy inputs: the need for new rule semantics1994In: Proceedings of the Third IEEE Conference on Fuzzy Systems, 1994. IEEE World Congress on Computational Intelligence, VOLS I-III, IEEE conference proceedings, 1994, 111-114 p.Conference paper (Refereed)
    Abstract [en]

    The standard computation taking place in a fuzzy logic controller proceeds from crisp inputs and via the consecutive steps of fuzzification, inference, and defuzzification computes a crisp control output. However, this computational practice simplifies to an extent the actual developments taking place in the closed loop. In reality, the knowledge about the current values of the controller input is very often available via sensory measurements. In this case, one has to take into account the negative side effects that come up with the use of sensors, in particular the presence of noisy measurements. In the paper the authors consider one particular way of dealing with noisy controller inputs, namely transforming the noise-distribution into a fuzzy set and then feeding back the so obtained fuzzy signal to the controller input. Adopting this approach requires that the shape of the input fuzzy signal should be reflected as much as possible in the output fuzzy signal so that important noise characteristics are preserved. In the paper the authors describe the requirements on the shape of the fuzzy output signal given a certain fuzzy input signal and show that the existing semantics for fuzzy IF-THEN rules do not satisfy these requirements. The authors propose new semantics for such rules which together with max-min composition produces the desired results.

  • 337.
    Driankov, Dimiter
    et al.
    Örebro University, School of Science and Technology.
    Saffiotti, AlessandroÖrebro University, School of Science and Technology.
    Fuzzy Logic Techniques for Autonomous Vehicle Navigation2001Collection (editor) (Refereed)
    Abstract [en]

    The goal of autonomous mobile robotics is to build and control physical systems which can move purposefully and without human intervention in real-world environments which have not been specifically engineered for the robot. The development of techniques for autonomous mobile robot operation constitutes one of the major trends in the current research and practice in modern robotics. This volume presents a variety of fuzzy logic techniques which address the challenges posed by autonomous robot navigation. The focus is on four major problems: how to design robust behavior-producing control modules; how to use data from sensors for the purpose of environment modeling; and how to integrate high-level reasoning and low-level behavior execution. In this volume state-of-the-art fuzzy logic solutions are presented and their pros and cons are discussed in detail based on extensive experimentation on real mobile robots.

  • 338.
    Duckett, Tom
    et al.
    Lincoln School of Computer Science, University of Lincoln, Brayford Pool, Lincoln, United Kingdom.
    Lilienthal, Achim J.
    Örebro University, School of Science and Technology.
    Special Issue: Selected Papers from the 5th European Conference on Mobile Robots (ECMR 2011)2013In: Robotics and Autonomous Systems, ISSN 0921-8890, E-ISSN 0921-8830, Vol. 61, no 10, 1049-1050 p.Article in journal (Other academic)
  • 339.
    Dunberg, Adam
    et al.
    Örebro University, School of Science and Technology.
    Nygren, Johan
    Örebro University, School of Science and Technology.
    Arbetsmiljöplanen- Kommunikationen mellan arbetsledning och underentreprenör2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background

    The authors' backgrounds in construction have contributed toexperience of insufficient communication between management and subcontractors. This is a contributing reason to examinehow the communication of the health and safety documentationshould function in theory and compareit to howitworks in practice.

    Purpose

    Report´s questions

    How is the health and safety documentation communicated from NCC to the subcontractors in the daily work?

    How is the health and safety documentation applied on the construction site?

    The main purpose of the report is to find solutions to potential flaws based on the report´s questions.

    Method

    A literature study was performed initially, which has been ongoing as the work progresses. Thereafter, a study through interviews has been done with the managers from three different NCC construction sites. To get a fair idea how the health and safety documentation is communicated, interviews with the subcontractors has been done. A survey has been submitted to subcontractors on all construction sites visited during the interviews.

    Results

    The study through interviews showsdifferent point of viewson how the health and safety documentation applies and communicates.The difference is based on the respondent’s profession or rank on the construction site. The management sees a challenge in getting theworkers to embrace the content of the health and safety documentation. The workers on the other hand tend to think the managers show a lack of commitment on the subject. The survey shows a low percentage of workers who actually read through the health andsafety documentationthoroughly.

  • 340.
    Duras, Toni
    et al.
    Örebro University, School of Science and Technology.
    Lindman, Niklas
    Örebro University, School of Science and Technology.
    Medianer under trecykelavståndet på symmetriska gruppen2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 341.
    Duro, Lara
    et al.
    Amphos 21 Consulting S.L..
    Grivé, Mireia
    Amphos 21 Consulting S.L..
    Gaona, Xavier
    Amphos 21 Consulting S.L..
    Bruno, Jordi
    Amphos 21 Consulting S.L..
    Anderson, Thomas
    Linköping University, Linköping, Sweden.
    Borén, Hans
    Linköping University, Linköping, Sweden.
    Dario, Mårten
    Linköping University, Linköping, Sweden.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Hagberg, Jessika
    Örebro University, School of Science and Technology.
    Källström, Klas
    Svensk Kärnbränslehantering AB, Stockholm, Sweden.
    Study of the effect of the fibre mass UP2 degradation products on radionuclide mobilisation2012Report (Refereed)
  • 342.
    Dybeck, Markus
    Örebro University, School of Science and Technology.
    Omnia HR En HR-plattform för SharePoint2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Omnia HR is a HR-platform developed for Microsoft SharePoint. In this article, the creation of a smaller part for the platform – the onboarding – is described. When a new employee is hired, the company need to do some tasks before the new employees first day, that’s what the onboarding is all about. In this project conditions to administrate and handle these tasks were made.

     

    The project was written in the programing language TypeScript, developed by Microsoft. TypeScript is superset of JavaScript and is transpiled down to pure JavaScript with support for the latest functions. In this rapport pros and cons by using TypeScript for a project is discussed, and if it actually makes the process easier or if it’s just as good to use regular JavaScript.

  • 343.
    Dyrebrant, Mattias
    et al.
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Broberg, Pontus
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Förbättringsmöjligheter av samarbetet mellan projektör & entreprenör i ett BIM-projekt2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project is about improving the possibilities of communication between the entrepreneur and the projector. Today's construction industry is in a major change to BIM, and it is therefore particularly important that the communication works between the parties as cooperation goes as smoothly and seamlessly as possible for best results. An enhanced cooperation to create a better relationship between the companies and can keep down costs and time to the project.

    To arrive at the best result of the study interviews with both the contractor and the designer of the project Stenkumla – Dunsjö were made. The major entrepreneur of the project is Skanska and the projector isWSP. Most of the interviews that have been done have been with entrepreneur to find out what they are missing. The result of the interviews have then been discussed with the projector to see if they knew about the comments that the entrepreneurs had and if they had a solution for it already.

    After the interviews it turned out that most of the entrepreneurs felt that a piece of the puzzle that was missing were education, they felt that they had not received sufficient education on how to use the model in the best way. Since BIM is a new approach in which the model is a central part it was considered important. It came up more comments from the entrepreneur where the comments only were about lack of communication where many were about the lack of education.

    The result can lead companies to open more dialogues and puts more time to listen to what can be improved.

  • 344.
    Dyrebrant, Tobias
    Örebro University, School of Science and Technology.
    Utveckling av användargränssnittet för Atlas Copcos portal för samarbete med underleverantörer (SCP)2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When creating a user interface, a developer should base their work on a number of design

    principles. This enables an effective user flow, where the user navigates through the system

    without difficulties. Thereby the user can absorb the information that the system provides to

    the fullest.

     

    These design principles form the basis of the practical work that was carried out for this

    report. The purpose was to develop a web portal, which was used by a company for

    collaboration with its suppliers. By basing the development on the principles, as well as

    interviews with the users, improvements were to be made on the current system. This should

    result in a better user experience and an optimal efficiency of the system.

     

    The practical work was divided into two stages. The first stage involved concrete changes on

    the current system, where smaller adjustments were introduced that could easily be

    implemented on the current web portal. The second stage was about an analysis of the

    market's leading design solutions, which should show existing smart and up-to-date solutions

    that could be used to improve the system. These steps constituted the process of improvement

    work that was to be carried out on the web portal.

     

    The result was a user interface that satisfies the majority of users. Through the objective

    design principles a user friendly system with an efficient user flow was created.

  • 345.
    Eckert, Andreas
    et al.
    Department of Mathematics, Linnaeus University, Växjö, Sweden.
    Nilsson, Per
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Introducing a symbolic interactionist approach on teaching mathematics: The case of revoicing as an interactional strategy in the teaching of probability2017In: Journal of Mathematics Teacher Education, ISSN 1386-4416, E-ISSN 1573-1820, Vol. 20, no 1, 31-48 p.Article in journal (Refereed)
    Abstract [en]

    This study examines an interactional view on teaching mathematics, whereby meaning is co-produced with the students through a process of negotiation. Further, teaching is viewed from a symbolic interactionism perspective, allowing the analysis to focus on the teacher’s role in the negotiation of meaning. Using methods inspired by grounded theory, patterns of teachers’ interaction are categorized. The results show how teachers’ actions, interpretations and intentions form interactional strategies that guide the negotiation of meaning in the classroom. The theoretical case of revoicing as a teacher action, together with interpretations of mathematical objects from probability theory, is used to exemplify conclusions from the proposed perspective. Data are generated from a lesson sequence with two teachers working with known and unknown constant sample spaces with their classes. In the lessons presented in this article, the focus is on negotiations of the meaning of chance. The analysis revealed how the teachers indicate their interpretations of mathematical objects and intentions to the students to different degrees and, by doing so, create opportunities for the students to ascribe meaning to these objects. The discussion contrasts the findings with possible interpretations from other perspectives on teaching.

  • 346.
    Edberg, Edward
    Örebro University, School of Science and Technology.
    Proof of Concept av Enterprise Appstore för Windows 82013Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was a Proof of Concept of how an Enterprise Appstore could be created for Windows 8. It was assigned by Sogeti,which had an interest and a question regarding the possibilities of developing such a product. A need existed for enterprises to be able to distribute their own apps to their employees in a simple way.

     

    The thesis focuseson the management of apps on the client without the use of Windows Store and how the management could be performed without disturbingthe users in their work. Several limitations was found to exist in Windows 8 that presented the challenge of creating such a product.

  • 347.
    Edman, Rickard
    et al.
    Örebro University, School of Science and Technology.
    Östberg, Markus
    Örebro University, School of Science and Technology.
    Γ-funktionenEn kort introduktion2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 348.
    Efremova, Natalia
    et al.
    Plekhanov Russian University.
    Kiselev, Andrey
    Örebro University, School of Science and Technology.
    Cognitive Architectures for Optimal Remote Image Representation for Driving a Telepresence Robot2014Conference paper (Refereed)
  • 349.
    Ehrlin, Niklas
    Örebro University, School of Science and Technology.
    Vad är partnering?: Varför vara kritisk till partnering?2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Partnering as a cooperation form can be used in every type of building project. Partnering can be used from an early stage in a project and all the way to the finishing line. There are even some examples where partnering successfully have proceed way longer than to the completing of the project. On these kind of occasions the cooperation has concluded maintenance of the final product. But what does partnering really mean? It is well known that partnering consists of actors working together but what does this actually mean considering the working form? And how are you supposed to make partnering successful? Furthermore, partnering have gotten an undeserved bad label as something out of date and useless. Some companies even chooses not to use the word partnering just because the negative associations from the word.

    This essay will make the concept of partnering more clear and will work as a guide for how to make partnering successful. The work is based on studies of literature written in the subject as well as qualitative interviews.

  • 350.
    Eichbaum, Kathrin
    et al.
    RWTH Aachen University, Aachen, Germany.
    Brinkmann, Markus
    RWTH Aachen University, Aachen, Germany.
    Buchinger, Sebastian
    German Federal Institute of Hydrology (BfG), Koblenz, Germany.
    Hecker, Marcus
    University of Saskatchewan, Saskatoon, Canada.
    Engwall, Magnus
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    van Bavel, Bert
    Örebro University, School of Science and Technology, Örebro University, Sweden.
    Reifferscheid, Georg
    German Federal Institute of Hydrology (BfG), Koblenz, Germany.
    Hollert, Henner
    RWTH Aachen University, Aachen, Germany.
    The dioRAMA project: assessment of dioxin-like activity in sediments and fish (Rutilus rutilus) in support of the ecotoxicological characterization of sediments2013In: Journal of Soils and Sediments, ISSN 1439-0108, E-ISSN 1614-7480, Vol. 13, no 4, 770-774 p.Article in journal (Refereed)
    Abstract [en]

    Introduction: Given the complex interactions of re-suspension processes and bioavailability of sediment-bound pollutants such as dioxin-like chemicals, there is need for a better integrative understanding of the cause-effect relationship of these pollutants. Currently, the majority of studies investigating potential risks of these chemicals only focus on characterizing sediment extracts via in vitro bioassays, thereby disregarding bioavailability, uptake, metabolism, and elimination rates of these compounds in vivo. To determine to which extent mechanism-specific effects in vitro reflect possible adverse effects in vivo, the research project dioRAMA, involving partnership between the Institute for Environmental Research of RWTH Aachen University and the Department Biochemistry/Ecotoxicology of the German Federal Institute of Hydrology, was established.

    Methods: Animals from an elevated trophic level-common roach (Rutilus rutilus)-will be exposed to sediments from two major German rivers. Exposure will be performed in a system that enables a concurrent monitoring of environmental parameters. In parallel, in vitro studies will be conducted to determine dioxin-like potentials of sediment and fish extracts from the in vivo exposure experiments using different cell lines with varying endpoints. Moreover, extract fractionation procedures, using the strategy of effect-directed analysis, will enable the detection of specific contaminant groups responsible for the biological activity observed.

    Conclusion: A closer interconnection between applied ecotoxicological science and regulatory needs will facilitate the improved assessment of dioxin-like compounds in sediment and biota. Consequently, this will enable their application in sediment management programs, which is one of the main goals of the dioRAMA project.

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