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  • 1151. Alberg, Henrik
    et al.
    Berglund, Daniel
    Comparison of plastic, viscoplastic, and creep models when modelling welding and stress relief heat treatment2003In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 192, no 49-50, p. 5189-5208Article in journal (Refereed)
    Abstract [en]

    A major concern when carrying out welding and heat treatment simulations is to accurately model material behaviour as it varies with temperature and composition. Early in the product development process, a less sophisticated material model may be suitable to compare different concepts where less accuracy in deformation and residual stress is acceptable. At later stages in the product development process, more sophisticated models may be used to obtain more accurate predictions of deformations and residual stresses. This paper presents a comparison of five different material models applied to the simulation of a combined welding and heat treatment process for a fabricated martensitic stainless steel component.

  • 1152. Alberg, Henrik
    et al.
    Berglund, Daniel
    Corrigendum to: "Comparison of plastic, viscoplastic, and creep models when modelling welding and stress relief heat treatment"2004In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 193, no 45-47, p. 5063-5067Article in journal (Other academic)
  • 1153. Alberg, Henrik
    et al.
    Mannberg, Peter
    Numerical simulation of heat treatment using a coupled fluid and structure approach2000Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    It is important to predict properties of manufactured components to ensure quality and reliability, especially in the aerospace engine industry. Some manufacturing processes affect properties in an undesirable way. It can for example be residual stresses or unwanted deformations of a component. This thesis is an initial study of how to numerical simulate the heat treatment processes and to predict the properties that affects the quality of manufacturing. There is a number of different ways to solve this problem. The tools used in this thesis are the Finite Element Method (FEM) and Computational Fluid Dynamics (CFD). The gas flow in the heat treatment furnace will be solved by CFD. This solution will be used to generate boundary condition for the FE-prediction of temperature and mechanical changes during manufacturing. The coupling between CFD and FEM will be done in an automatic way. In the commercial codes used there exists no coupling. A coupling has been implemented in the FE-program. The coupling will not be tight: i.e. no iteration of results between CFD and FEM will take place automatically. The method used is shown as an attractive way to solve a heat treatment problem by numerical simulation. Some needed improvements have been identified, mainly regarding the pre-processor in both CFD and FEM. An improved search algorithm in the developed user subroutine is identified for future work. In this thesis, the communication between the software for CFD and FEM is achieved by a FORTRAN user subroutine. This way of communication between the different software is not desired. A way to transfer results, not depending on the chosen software, would be preferable. Better knowledge of boundary conditions of the furnace has to be considered in more detail. Better boundary conditions would likely give a more accurate result. No experimental data has been available so there is no verification of the method and the simulation results. This is the first step towards a system for "smart" cooling.

  • 1154. Albert, Kinga
    SvalPoint: A Multi-track Optical Pointing System2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Kjell Henriksen Observatory (KHO) is researching the middle- and upper atmosphere with optical instruments. It is located in a remote region, 15 km away from Longyearbyen in Svalbard, Norway. During the auroral season it is accessible only by special transportation, snowmobile or band wagon and during its approach protection against polar bears is also necessary. Due to these inconveniences a pointing system for the remote control of the instruments was desired.The purpose of this thesis has been to develop a system optimising operations at KHO, with room for further extensions. SvalPoint offers a solution for multiple instrument pointing through the internet. The system has been defined during the time of the thesis work, incorporating new and previously developed applications into a software package. The different programs interact to define a target and point a number of instruments at it.In the presentation of SvalPoint the key elements are the design of the software system, the algorithms used for the control and in order to ensure the correct operations the hardware calibration. To create a complete image of the system, in addition both the hardware and the projects incorporated are presented. As to finalise the software development its testing is described along with the assessment of the system's accuracy. Aspects regarding the work process are also presented: definition of goals, task analysis, conclusions and suggestions for further work.

  • 1155.
    Alberti, M.
    et al.
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Switzerland.
    Pondenkandath, V.
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Switzerland.
    Wursch, M.
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Switzerland.
    Ingold, R.
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Switzerland.
    Liwicki, Marcus
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab. Document Image and Voice Analysis Group (DIVA), University of Fribourg, Switzerland.
    DeepDIVA: A Highly-Functional Python Framework for Reproducible Experiments2018In: Proceedings of International Conference on Frontiers in Handwriting Recognition, ICFHR 2018, IEEE, 2018, p. 423-428, article id 8583798Conference paper (Refereed)
    Abstract [en]

    We introduce DeepDIVA: an infrastructure designed to enable quick and intuitive setup of reproducible experiments with a large range of useful analysis functionality. Reproducing scientific results can be a frustrating experience, not only in document image analysis but in machine learning in general. Using DeepDIVA a researcher can either reproduce a given experiment or share their own experiments with others. Moreover, the framework offers a large range of functions, such as boilerplate code, keeping track of experiments, hyper-parameter optimization, and visualization of data and results. To demonstrate the effectiveness of this framework, this paper presents case studies in the area of handwritten document analysis where researchers benefit from the integrated functionality. DeepDIVA is implemented in Python and uses the deep learning framework PyTorch. It is completely open source(1), and accessible as Web Service through DIVAServices(2).

  • 1156.
    Alberti, Michele
    et al.
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Pondenkandath, Vinaychandran
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Würsch, Marcel
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Bouillon, Manuel
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Seuret, Mathias
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Ingold, Rolf
    Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Liwicki, Marcus
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab. Document Image and Voice Analysis Group (DIVA), University of Fribourg, Fribourg, Switzerland.
    Are You Tampering with My Data?2019In: Computer Vision – ECCV 2018 Workshops: Proceedings, Part II / [ed] Laura Leal-Taixé & Stefan Roth, Springer, 2019, p. 296-312Conference paper (Refereed)
    Abstract [en]

    We propose a novel approach towards adversarial attacks on neural networks (NN), focusing on tampering the data used for training instead of generating attacks on trained models. Our network-agnostic method creates a backdoor during training which can be exploited at test time to force a neural network to exhibit abnormal behaviour. We demonstrate on two widely used datasets (CIFAR-10 and SVHN) that a universal modification of just one pixel per image for all the images of a class in the training set is enough to corrupt the training procedure of several state-of-the-art deep neural networks, causing the networks to misclassify any images to which the modification is applied. Our aim is to bring to the attention of the machine learning community, the possibility that even learning-based methods that are personally trained on public datasets can be subject to attacks by a skillful adversary.

  • 1157. Albertsson, Camilla
    et al.
    Orrdal, Emma
    Kartläggning av distriktlagstränares kännedom och användande av knäkontroll som skadeförebyggande träning för korsbandsskador hos flickor: En enkätstudie2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1158. Albertsson, Catarina
    et al.
    Brännström, Monica
    Den nyutexaminerade sjuksköterskans upplevelse av transitionen från student till arbetande sjuksköterska: en litteraturstudie2005Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1159.
    Albertsson, Ellenor
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Holmbom, Lina
    Luleå University of Technology, Department of Health Sciences.
    Personers upplevelser av att förändra sina levnadsvanor efter genomgången hjärtinfarkt: En litteraturstudie2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Hjärtinfarkt är i dag en av de största orsakerna till funktionsnedsättning och död runt om i världen. Egenvård är en stor del av behandlingen efter en hjärtinfarkt och innebär att personen på egen hand eller med hjälp av andra utför vissa delar av sin behandling. Syftet med denna litteraturstudie var att beskriva personers upplevelser av att förändra sina levnadsvanor efter genomgången hjärtinfarkt. Studien gjordes med fokus på ett inifrånperspektiv och är baserad på elva artiklar som analyserats med kvalitativ innehållsanalys med manifest ansats. Analysen resulterade i fyra kategorier; att stöd från andra ger trygghet till att genomföra förändringar, att rädsla hämmar och bidrar till förändring, att vilja ta hand om sig själv och att hindras från att kunna ta hand om sig själv. Resultatet visar att personer som genomgått en hjärtinfarkt behöver motivation för att kunna förändra sina levnadsvanor. Personerna har ett stort behov av information och kunskap för att kunna förstå sambandet mellan sjukdom och behovet av egenvård. Genom att personen har stöd ifrån ett socialt nätverk och från sjukvården upplever personen en trygghet i att genomföra och motiveras till att behålla de nya levnadsvanorna. Sjukvården bör fokusera på att ge en personcentrerad omvårdnad och kontinuerligt utvärdera hur personens motivation, behov och kunskap förändras över tid.

  • 1160.
    Albertsson, Galina Jelkina
    et al.
    Department of Materials Science and Engineering, Royal Institute of Technology.
    Engström, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Teng, Lidong
    Department of Materials Science and Engineering, Royal Institute of Technology.
    Effect of the Heat Treatment on the Chromium Partition in Cr-Containing Industrial and Synthetic Slags2014In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 85, no 10, p. 1418-1431Article in journal (Refereed)
    Abstract [en]

    In the present work, the effects of the slag composition and heat-treatment conditions on the phase relationships in a number of Cr-containing industrial and synthetic slags were investigated with a view to control the precipitation of Cr-spinel in the slag phase. Gas/slag equilibrium technique was used for the chromium partition and the phase relationship study. The phase relationships in synthetic slags and industrial EAF slags supplied by Swedish steelmaking plants have been investigated experimentally in the temperature range of 1473–1873 K. The slags were re-melted, slow-cooled to, and soaked at targeted temperatures in controlled atmosphere. Two different heat-treatment sequences were used in the present experiments. The oxygen partial pressure () was maintained by a suitable mixture of CO and CO2 gases. Phases present and their compositions in the quenched slags were studied using X-ray diffractometry (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The chromium content in the phases present was analyzed using wavelength-dispersive spectrometer (WDS). Chromium partition was found to depend on the heat-treatment temperature

  • 1161.
    Albertsson, Galina Jelkina
    et al.
    Department of Materials Science and Engineering, Royal Institute of Technology, Division of Materials Process Science, Royal Institute of Technology (KTH).
    Teng, Lidong
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Effect of basicity on chromium partition in CaO-MgO-SiO2-Cr 2O3 synthetic slag at 1873 K2014In: Transactions of the Institution of Mining and Metallurgy Section C - Mineral Processing and Extractive Metallurgy, ISSN 0371-9553, E-ISSN 1743-2855, Vol. 123, no 2, p. 116-122Article in journal (Refereed)
    Abstract [en]

    The objective of the present work is to get an understanding of the phase relationships in the CaO-MgO-SiO2-Cr2O3 system with a view to control the precipitation of Cr-spinel in the slag phase. The equilibrium phases in CaO-MgO-SiO2-Cr2O3 slag system at 1873 K (1600°C) have been investigated experimentally and compared with the results from thermodynamic calculations. The Cr2O 3 and MgO contents in the slag were fixed at 6 and 8 wt-% respectively. The basicity (CaO/SiO2) of slag was varied in the range 1·0-2·0. A gas/slag equilibrium technique was adopted to synthesise the slag at a high temperature in air. The samples were heated to and soaked at 1873 K (1600°C) for 24 h in order to achieve the equilibrium state and subsequently quenched in water. The chromium distribution and phase compositions in the quenched slag were studied using scanning electron microscope wavelength dispersive spectroscopy and X-ray diffraction techniques. FactSage software was used for the phase equilibrium calculations. The experimental results obtained from the present work were compared with the calculation results from FactSage software. It was found that the spinel formation at 1873 K (1600°C) is favoured in the slag basicity range 1·0-1·4

  • 1162.
    Albertsson, Galina Jelkina
    et al.
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Teng, Lidong
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Engström, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Seetharaman, Seshadri
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Effect of the heat treatment on the chromium partition in CaO-MgO-SiO2-Cr2O3 synthetic slags2013In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 44, no 6, p. 1586-1597Article in journal (Refereed)
    Abstract [en]

    Mg-spinel phase is known to be important for control of Cr leaching from Cr-containing slags. The objective of the present study is to get an understanding of the phase relationships in the CaO-MgO-SiO2-Cr2O3 system with a view to control the precipitation of Cr-spinel in the slag phase. The equilibrium phases in CaO-MgO-SiO2-Cr2O3 slag system in the range of 1673 K to 1873 K (1400 °C to 1600 °C) have been investigated experimentally and compared with the results from thermodynamic calculations. The slag compositions close to the industrial slag systems were chosen. The Cr2O3 and MgO contents in the slag were fixed to be 6 and 8 wt pct, respectively. The basicity (CaO/SiO2) of the slag was varied in the range of 1.0 to 2.0. The slags were synthesized at a pre-determined oxygen partial pressure (10-4) or air (2.13 × 104 Pa) at a temperature above the liquidus temperature. The samples were then soaked at targeted temperatures for 24 hours in controlled atmosphere in order to achieve the equilibrium state before quenching in water. Four different heat-treatment regimes (defined as Ia, Ib, II.a and II.b) in Section II-D) were used in the present experiments. The lower oxygen partial pressure was maintained by a suitable mixture of CO and CO2 gases. Phases present and their compositions in the quenched slags were studied using scanning electron microscopy coupled with energy-dispersive spectroscopy and X-ray diffraction techniques. The chromium content in the phases present was analyzed using wavelength-dispersive spectrometer. The experimental results obtained are compared with the calculation results from Factsage software. The size of spinel crystals increased drastically after slow-cooling from 1873 K (1600 °C) followed by annealing at 1673 K (1400 °C) for 24 hours (heating regimes II) compared to samples being quenched directly after soaking at 1873 K (1600 °C) (heating regime I.a). It was found that the amount of foreign elements in the spinel phase, and other phases decreased after soaking at oxygen partial pressure of 10-4 Pa resulting in phases with less defects and foreign oxide contents compared to those treated in air. The size of spinel crystals was found to be larger in samples with lower basicity

  • 1163.
    Albertsson, Galina
    et al.
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Teng, Lidong
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Seetharaman, Seshadri
    Division of Materials Process Science, Royal Institute of Technology (KTH).
    Effect of low oxygen partial pressure on the chromium partition in CaO–MgO–SiO2–Cr2O3–Al2O3 synthetic slag at elevated temperatures2013In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 84, no 7, p. 670-679Article in journal (Refereed)
    Abstract [en]

    The objective of the present work is to get an understanding of the impact of Al2O3 addition on the phase relationships in the CaO–MgO–Al2O3–SiO2–Cr2O3 slags at low oxygen partial pressures ( = 10−4 Pa), with a view to control the precipitation of Cr-spinel in the slag. The equilibrium phases in CaO–MgO–Al2O3–SiO2–Cr2O3 slag system in the range on 1673–1873 K have been investigated. The compositions close to the industrial slag systems were chosen. The Cr2O3 content was fixed at 6 wt% and MgO at 8 wt%. Al2O3 contents in the slag were varied in the range of 3–12 wt%. The basicity (CaO/SiO2) of slag was set to 1.6. Gas/slag equilibrium technique was adopted. The samples were heated to 1873 K and soaked at this temperature for 24 h. The samples were then slow cooled to 1673 K and equilibrated for an additional 24 h. The oxygen partial pressure was kept at 10−4 Pa. A gas mixture of CO/CO2 was used to control the oxygen partial pressure. After the equilibration, the samples were quenched in water. The chromium distribution and phase compositions in the quenched slags were studied using SEM–WDS and XRD techniques. The results were compared with the phase equilibrium calculations obtained from FACTSAGE software and the samples equilibrated in air. The size of spinel crystals increased drastically after slow cooling followed by annealing compared to samples being quenched after soaking at 1873 K. It was also found that low oxygen partial pressure had a strong impact on chromium partition. The amount of spinel phase increases with increased Al2O3 content.

  • 1164. Albertsson, Heléne H.
    Fysiska begränsningsåtgärder inom äldreomsorgens särskilda boenden: en studie ur personalperspektiv2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1165. Albertsson, Kim
    Towards self-learning sensors: Matching pursuit with dictionary learning on FPGA2013Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A general approach for sparse signal decomposition is matching pursuit with an over-complete dictionary of features. It has been demonstrated that this gives efficient codes when applied to images and acoustic signals. This thesis implements an on-line version of matching pursuit with Hebbian dictionary learning, which is theoretically able to process vibration and acoustic emission signals for condition monitoring of, for example, bearings. The implementation is done in C and critical parts are identified and implemented in VHDL with the goal of synthesising those parts on an FPGA. The C implementation can handle data in two formats, both fixed and floating point and is verified to be functioning in both cases. The VHDL components are verified in simulation. The maximum processing speed possible for the designed system is expected be on the order of one million samples per second, 1 Msps.

  • 1166.
    Albertsson, Kim
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Gleyzer, Sergei
    University of Florida.
    Zapata, Omar
    OProject and University of Antioquia.
    Machine Learning in High Energy Physics Community White Paper2018In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 1085, article id 022008Article in journal (Refereed)
    Abstract [en]

    Machine learning is an important applied research area in particle physics, beginning with applications to high-level physics analysis in the 1990s and 2000s, followed by an explosion of applications in particle and event identification and reconstruction in the 2010s. In this document we discuss promising future research and development areas in machine learning in particle physics with a roadmap for their implementation, software and hardware resource requirements, collaborative initiatives with the data science community, academia and industry, and training the particle physics community in data science. The main objective of the document is to connect and motivate these areas of research and development with the physics drivers of the High-Luminosity Large Hadron Collider and future neutrino experiments and identify the resource needs for their implementation. Additionally we identify areas where collaboration with external communities will be of great benefit.

  • 1167. Albertsson, Lena
    et al.
    Brännström, Beatrice
    Marknadsorienterade informationssystem: faktorer som påverkar användningen av en kundkiosk2005Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1168.
    Albertsson, Sophie
    et al.
    Luleå University of Technology, Department of Health Sciences, Health and Rehabilitation.
    Hjerpe, Caroline
    Luleå University of Technology, Department of Health Sciences, Health and Rehabilitation.
    Den gravida kroppen - individens eller sjukvårdens ansvar?: En kvalitativ studie om kvinnors uppfattningar och erfarenheter.2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Träning under en graviditet är viktigt både ur ett fysiologiskt samt psykologiskt perspektiv. Bristande fysisk aktivitet är en stor riskfaktor för hälsan. Livshändelser såsom graviditet och förlossning kan utgöra en större risk för bristande fysisk aktivitet hos kvinnor. Gravida kvinnor rekommenderas att vara fysiskt aktiva minst 30 minuter per dag. Informationen kring fysisk aktivitet och träning är ofta bristfällig inom mödrahälsovården varför det efterlyses ett närmare samarbete mellan till exempel barnmorskor och fysioterapeuter. Genom att förbättra kvantiteten och kvaliteten på informationen angående fysisk aktivitet hos gravida finns det en möjlighet att korrigera felaktiga uppfattningar och på så sätt främja en god hälsa. Syfte: Syftet var att beskriva kvinnors egen uppfattning om fysisk aktivitet och träning under och efter en graviditet samt upplevelse av mottagen information från sjukvården angående ämnet. Metod: En kvalitativ intervjustudie genomfördes med fem kvinnor, vilka rekryterades via ett strategiskt urval. Därefter genomfördes en innehållsanalys av intervjuerna. Resultat: Analysen av intervjutexterna resulterade i en huvudkategori “Den gravida kroppen - individens eller sjukvårdens ansvar?”. Huvudkategorin innehöll följande kategorier “Kunskapsinhämtning - individens ansvar” samt “Aktivitetsnivå - individens val” med tillhörande underkategorier. Konklusion: Studien visade positiva upplevelser och uppfattningar av fysisk aktivitet och träning i samband med graviditeten. De intervjuade kvinnorna upplevde bristande information från sjukvården gällande detta ämne. De råd som kvinnorna hade fått från sjukvården upplevdes som osäkra och väldigt generella, därför fanns en önskan om att individanpassa råden.

  • 1169.
    Albeverio, S.
    et al.
    Institute of Mathematics, Ruhr-Universität, D-44780 Bochum.
    Dabrowski, L.
    SISSA.
    Kurasov, Pavel
    Luleå tekniska universitet.
    Symmetries of Schrödinger operator with point interactions1998In: Letters in Mathematical Physics, ISSN 0377-9017, E-ISSN 1573-0530, Vol. 45, no 1, p. 33-47Article in journal (Refereed)
    Abstract [en]

    The transformations of all the Schrödinger operators with point interactions in dimension one under space reflection P, time reversal T and (Weyl) scaling Wλ are presented. In particular, those operators which are invariant (possibly up to a scale) are selected. Some recent papers on related topics are commented upon

  • 1170.
    Albeverio, S.
    et al.
    Institut für Angewandte Mathematik, Universität Bonn.
    Fei, S-M
    Institut für Angewandte Mathematik, Universität Bonn.
    Kurasov, Pavel
    Luleå tekniska universitet.
    Many body problems with "spin"-related contact interactions2001In: Reports on mathematical physics, ISSN 0034-4877, E-ISSN 1879-0674, Vol. 47, no 2, p. 157-166Article in journal (Refereed)
    Abstract [en]

    We study quantum mechanical systems with "spin"-related contact interactions in one dimension. The boundary conditions describing the contact interactions are dependent on the spin states of the particles. In particular we investigate the integrability of N-body systems with δ-interactions and point spin couplings. Bethe ansatz solutions, bound states and scattering matrices are explicitly given. The cases of generalized separated boundary condition and some Hamiltonian operators corresponding to special spin related boundary conditions are also discussed.

  • 1171.
    Albeverio, S.
    et al.
    BiBoS Research Center.
    Haake, F.
    Fachbereich Physik, Universität-GH Essen.
    Kurasov, Pavel
    Luleå tekniska universitet.
    Kus, M.
    Fachbereich Physik, Universität-GH Essen.
    Šeba, P.
    Nuclear Physics Institute, Czech Academy of Sciences.
    S-matrix, resonances, and wave functions for transport through billiards with leads1996In: Journal of Mathematical Physics, ISSN 0022-2488, E-ISSN 1089-7658, Vol. 37, no 10, p. 4888-4903Article in journal (Refereed)
    Abstract [en]

    For a simple model describing the S-matrices of open resonators the statistical properties of the resonances are investigated, as well as the wave functions inside the resonator

  • 1172.
    Albeverio, S.
    et al.
    Department of Mathematics, Ruhr-University, Bochum.
    Kurasov, Pavel
    Luleå tekniska universitet.
    Finite rank perturbations and distribution theory1999In: Proceedings of the American Mathematical Society, ISSN 0002-9939, E-ISSN 1088-6826, Vol. 127, no 4, p. 1151-1161Article in journal (Refereed)
  • 1173.
    Albeverio, S.
    et al.
    Department of Mathematics, Ruhr-University, Bochum.
    Kurasov, Pavel
    Luleå tekniska universitet.
    Rank one perturbations of not semibounded operators1997In: Integral equations and operator theory, ISSN 0378-620X, E-ISSN 1420-8989, Vol. 27, no 4, p. 379-400Article in journal (Refereed)
    Abstract [en]

    Rank one perturbations of selfadjoint operators which are not necessarily semibounded are studied in the present paper. It is proven that such perturbations are uniquely defined, if they are bounded in the sense of forms. We also show that form unbounded rank one perturbations can be uniquely defined if the original operator and the perturbation are homogeneous with respect to a certain one parameter semigroup. The perturbed operator is defined using the extension theory for symmetric operators. The resolvent of the perturbed operator is calculated using Krein's formula. It is proven that every rank one perturbation can be approximated in the operator norm. We prove that some form unbounded perturbations can be approximated in the strong resolvent sense without renormalization of the coupling constant only if the original operator is not semibounded. The present approach is applied to study first derivative and Dirac operators with point interaction, in one dimension

  • 1174. Albeverio, Sergio
    et al.
    Hilbert, Astrid
    Luleå tekniska universitet.
    Kolokoltsov, Vassily
    Sur le comportement asymptotique du noyau associé à une diffusion dégénérée2000In: Comptes Rendus Mathematiques de l'Academie des Sciences = Mathematical reports of the academy of science, ISSN 0706-1994, Vol. 22, no 4, p. 151-159Article in journal (Refereed)
  • 1175. Albiin, Helena
    et al.
    Levander, Stina
    Upplevelser hos personer som lever med dialysbehandling: en litteraturstudie2006Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1176. Albing, Daniel
    Klassiska och sannolikhetsbaserade metoder för släntstabilitetsanalys2004Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 1177. Albing, Fredrik
    Trimning i FEM-simuleringar2000Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 1178.
    Albing, Malin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Contributions to process capability indices and plots2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis presents contributions within the field of process capability analysis. Process capability analysis deals with how to assess the capability of processes. Based on process capability analysis one can determine how the process performs relative to its product requirements or specifications. An important part within process capability analysis is the use of process capability indices. This thesis focuses on process capability indices and process capability plots. The thesis consists of six papers and a summary. The summary gives a background to the research area, a short overview of the six papers, and some suggestions for future research. The thesis summary also consists of some new results, not presented in any of the appended papers. In paper I, the frequency and use of process capability analysis, together with statistical process control and design of experiments, within Swedish companies hiring alumni students are investigated. We also investigate what motivates organisations to implement or not implement these statistical methods, and what is needed to increase the use. In papers II-III we generalize the ideas with process capability plots and propose two graphical methods, for deeming a process capable at a given significance level, when the studied quality characteristic is assumed to be normally distributed. In paper II we derive estimated process capability plots for the case when the specification interval is one-sided. In paper III we derive elliptical safety region plots for the process capability index Cpk and its one-sided correspondences. The proposed graphical methods are helpful to determine if it is the variability, the deviation from target, or both that need to be reduced to improve the capability. In papers IV-VI we propose a new class of process capability indices designed for the situation with an upper specification limit, a target value zero, and where the studied quality characteristic has a skewed, zero- bound distribution with a long tail towards large values. The proposed class of indices is simple and possesses properties desirable for process capability indices. The results in papers IV-VI are also valid for the situation with a target value, not equal to zero but equal to a natural lower limit of the quality characteristic. Three estimators of the proposed class of indices are studied and the asymptotic distributions of these estimators are derived. We also consider decision procedures, based on the estimated indices, suitable for deeming the process capability at a given significance level. The new results in the summary combines the ideas from paper II with the results in papers IV-VI and a graphical method for the class of indices proposed in IV-VI are derived.

  • 1179.
    Albing, Malin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Process capability analysis with focus on indices for one-sided specification limits2006Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this thesis some aspects of process capability analysis are considered. Process capability analysis deals with how to assess the capability of manufacturing processes. Based on the process capability analysis one can determine how the process performs relative to its product requirements or specifications. An important part within process capability analysis is the use of process capability indices. This thesis focuses on process capability indices in the situation when the specification limits are one- sided. The thesis consists of a summary and three papers, of which one is already published in an international journal. The summary gives a background to the research area, a short overview of the three papers, and some suggestions for future research. In Paper I, the frequency and use of process capability analysis together with statistical process control and design of experiments, within Swedish companies hiring alumni students are investigated. We also investigate what motivates organisations to implement or not implement these statistical methods, if there are differences in use that can be related to organisational types and what will be needed to increase the use. One conclusion drawn from the results is that the students employed in the Swedish industrial sector witness a modest use of these statistical methods and use in other sectors hiring the alumni is uncommon. In Paper II we present a graphical method useful when doing capability analysis having one-sided specification limits. This is an extension of the process capability plots previously developed for two-sided specification intervals. Under the assumption of normality we suggest estimated process capability plots to be used to assess process capability at a given significance level. The presented graphical approach is helpful to determine if it is the variability, the deviation from target, or both that need to be reduced to improve the capability. In Paper III the situation with non-negative process data having a skew distribution with a long tail towards large values are considered, when an upper specification limit only exists and the target value is 0. No proper indices exist for this specific situation, which is common in practice. We contribute to this area by proposing a new class of indices designed for skew, zero-bound distributions when an upper specification only exists and the target value is 0. This new class of indices is simple and possesses properties desirable for process capability indices. Two estimators of the proposed index are studied and the asymptotic distributions of these estimators are derived. Furthermore, we consider decision procedures, based on the estimated indices, suitable for deeming the process capability or not.

  • 1180.
    Albing, Malin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Process capability indices for Weibull distributions and upper specification limits2008Report (Other academic)
  • 1181.
    Albing, Malin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Process capability indices for Weibull distributions and upper specification limits2009In: Quality and Reliability Engineering International, ISSN 0748-8017, E-ISSN 1099-1638, Vol. 25, no 3, p. 317-334Article in journal (Refereed)
    Abstract [en]

    We consider a previously proposed class of capability indices that are useful when the quality characteristic of interest has a skewed, zero-bound distribution with a long tail towards large values and there is an upper specification with a pre-specified target value, T = 0. We investigate this class of process capability indices when the underlying distribution is a Weibull distribution and focus on the situation when the Weibull distribution is highly skewed. We propose an estimator of the index in the studied class, based on the maximum likelihood estimators of the parameters in the Weibull distribution, and derive the asymptotic distribution for this estimator. Furthermore, we suggest a decision rule based on the estimated index and its asymptotic distribution, and presents a power comparison between the proposed estimator and a previously studied estimator. A simulation study is also performed to investigate the true significance level when the sample size is small or moderate. An example from a Swedish industry is presented.

  • 1182. Albing, Malin
    et al.
    Vännman, Kerstin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Elliptical safety region plots for Cpk2011In: Journal of Applied Statistics, ISSN 0266-4763, E-ISSN 1360-0532, Vol. 38, no 6, p. 1169-1187Article in journal (Refereed)
    Abstract [en]

    The process capability index Cpk is widely used when measuring the capability of a manufacturing process. A process is defined to be capable if the capability index exceeds a stated threshold value, e.g. Cpk4/3. This inequality can be expressed graphically using a process capability plot, which is a plot in the plane defined by the process mean and the process standard deviation, showing the region for a capable process. In the process capability plot, a safety region can be plotted to obtain a simple graphical decision rule to assess process capability at a given significance level. We consider safety regions to be used for the index Cpk. Under the assumption of normality, we derive elliptical safety regions so that, using a random sample, conclusions about the process capability can be drawn at a given significance level. This simple graphical tool is helpful when trying to understand whether it is the variability, the deviation from target, or both that need to be reduced to improve the capability. Furthermore, using safety regions, several characteristics with different specification limits and different sample sizes can be monitored in the same plot. The proposed graphical decision rule is also investigated with respect to power

  • 1183. Albing, Malin
    et al.
    Vännman, Kerstin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Elliptical Safety Region Plots for Cpk, Cpu and Cpl2008Report (Other academic)
  • 1184. Albing, Malin
    et al.
    Vännman, Kerstin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Process capability indices for one-sided specifications and skew zero-bound distributions2006Report (Other academic)
  • 1185. Albing, Malin
    et al.
    Vännman, Kerstin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Skewed zero-bound distributions and process capability indices for upper specifications2009In: Journal of Applied Statistics, ISSN 0266-4763, E-ISSN 1360-0532, Vol. 36, no 2, p. 205-221Article in journal (Refereed)
    Abstract [en]

    A common practical situation in process capability analysis, which is not well developed theoretically, is when the quality characteristic of interest has a skewed distribution with a long tail towards relatively large values and an upper specification limit only exists. In such situations it is not uncommon that the smallest possible value of the characteristic is 0 and this also is the best value to obtain. Hence a target value 0 is assumed to exist. We investigate a new class of process capability indices for this situation. Two estimators of the proposed index are studied and the asymptotic distributions of these estimators are derived. Furthermore we suggest a decision procedure useful when drawing conclusions about the capability at a given significance level, based on the estimated indices and their asymptotic distributions. A simulation study is also performed, assuming that the quality characteristic is Weibull distributed, to investigate the true significance level when the sample size is finite.

  • 1186. Albino, Björn
    Geofysiska parametermätningar på borrkärnor från typområdet Gideå2001Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 1187. Albinsdotter - Darehed, Inger
    et al.
    Nilsson, Anette
    Människors upplevelser av att leva med stomi: en litteraturstudie2005Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1188. Albl, Cenek
    PanCam Bundle Adjustment2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis investigated the method of Bundle Adjustment with special focus on constrained systems, such as panoramic cameras. SBA algorithm from Lourakis and Argyros was implemented in Matlab and its functionality was validated. A new algorithm was proposed and implemented based the original one, incorporating the constraints suited for PanCam-like cameras. This algorithm was evaluated on both synthetic and real datasets. The performance was thoroughly analyzed and compared to the original method in terms of accuracy of the reconstruction. For synthetic datasets, significant improvements have been observed and expressed quantitatively. Particular improvements in terms of visual appearance have been observed on real datasets. Results were elaborated and possibilities for further improvement have been proposed.

  • 1189. Albons, Birgitta
    et al.
    Gunnarsson, Ewa
    Söderberg, Inger
    På vinst och förlust: rapport om datorisering i USA1981Report (Other (popular science, discussion, etc.))
  • 1190. Alborz, Banafsheh
    Value-based adoption of mobile internet in Iran2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Regarding the ever-increasing number of cell phone subscribers, the situations of businesses are changing to mobile form. The trend of switching fashion of business is from traditional to electronic commerce and from that to mobile commerce. Mobile Internet adoption is one of the fundamental steps to mobile commerce implementation. This research studies the adoption of Mobile Internet as a one of new Information and Communication Technology (ICT) from the value point of view. While M-Internet principally provides the same services as stationary Internet, its acceptance rate is lower than stationary Internet. The reason probably is the cost of its usage. The adopters of M-Internet are individuals and the majority of them use it for personal purpose and the cost of voluntary usage is tolerated by individuals. Thus, for studying the adoption of M-Internet the famous Technology Acceptance Model (TAM) which has been used for explaining traditional technologies is not appropriate for the reason that most of those users and adopters are employees who use it for their work and the cost of requisite adoption is suffered and supported by the organization. To overcome this distinguishes among traditional technology and fresh one, we should consider the perceived value from the customer's point of view and this is possible via the Value-based model (VAM).This study applies the Value-based Adoption Model in M-Internet. For doing so, a survey has been presented on M-Internet users, questionnaires were distributed among them and the results analyzed based research questions. Finally, the conclusions and implications were prepared.

  • 1191. Albrechtsson, Helena
    et al.
    Renman, Annelie
    Utveckling av morgondagens kylskåpsinredning2004Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1192.
    Alcazar, Magnus
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    "Ideas are simple. Implementation is Hard.": En Fallstudie om Nyckelfaktorer för Implementering av Planeringssystem inom Hemtjänsten2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Home care are a very common form of care and many prefer this form of care in front of hospitalized care. The home care service is therefore in need of a planning system in order to plan its work as efficiently as possible. Many of these implementations fail.

    Purpose: Many implementations in the home care service fail. The purpose of this paper is therefore to investigate what critical success factors project managers should focus on to achieve a successfull implementation.

    Method: This study has been conducted with a qualitative study as research method. A literature study was carried out by finding previous research in the field, which was then used as a theoretical framework. This was then compared with the empirical evidence acquired through semi-structured interviews with people with experience of implementations in the home care industry.

    Result: The result shows that the CSF’s that appeared in the literature study should also be used in practice. In addition, three new factors were identified

    Conclusion: All of the CSF’s presented in the literature study were reinforced by the interviews conducted with the informants in this study. References to how these should be used have also been developed. For example, the focus on the factor resources should primarily be put on the resource time.This study also concludes that depending on the type of organization it is about, such as small private companies, private medium-sized companies or municipal-owned businesses, focus should be on different CSF’s.

  • 1193.
    Al-Chalabi, Hussan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Life cycle cost analysis of the ventilation system in Stockholm's road tunnels2018In: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, E-ISSN 1758-7832, Vol. 24, no 3, p. 358-375Article in journal (Refereed)
    Abstract [en]

    Purpose

    This study developed a practical economic replacement decision model to identify the economic lifetime of the ventilation system used by Trafikverket in its Stockholm tunnels.

    Design/methodology/approach

    The proposed data driven optimisation model considers operating and maintenance costs, purchase price and system resale value for a ventilation system consisting of 121 fans. The study identified data quality problems in Trafikverket’s MAXIMO database.

    Findings

    It found the absolute economic replacement time (ERT) of the ventilation system is 108 months but for a range of 100 to 120 months, the total cost remains almost constant. Sensitivity and regression analysis showed the operating cost has the largest impact on the ERT.

    Originality/value

    The results are promising; the company has the possibility of significantly reducing the LCC of the ventilation system by optimising its lifetime. In addition, the proposed model can be used for other systems with repairable components, making it applicable, useful, and implementable within Trafikverket more generally.

  • 1194.
    Al-Chalabi, Hussan
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Al-Douri, Yamur
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Lundberg, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Time Series Forecasting using ARIMA Model: A Case Study of Mining Face Drilling Rig2018Conference paper (Refereed)
    Abstract [en]

    This study implements an AutoregressiveIntegrated Moving Average (ARIMA) model to forecast totalcost of a face drilling rig used in the Swedish mining industry.The ARIMA model shows different forecasting abilities usingdifferent values of ARIMA parameters (p, d, q). However,better estimation for the ARIMA parameters is required foraccurate forecasting. Artificial intelligence, such as multiobjective genetic algorithm based on the ARIMA model, couldprovide other possibilities for estimating the parameters. Timeseries forecasting is widely used for production control,production planning, optimizing industrial processes andeconomic planning. Therefore, the forecasted total cost data ofthe face drilling rig can be used for life cycle cost analysis toestimate the optimal replacement time of this rig.

  • 1195.
    Al-Dahan, Saadi
    et al.
    Department of Geology, Faculty of Science, University of Kufa.
    Alabidi, Abdelkadhum
    Department of Geology, Faculty of Science, University of Kufa.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Relationship between Selected Hydrochemical Parameters in Springs of Najaf Province, Iraq2015In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 7, no 6, p. 337-346Article in journal (Refereed)
    Abstract [en]

    Several springs exist at the south-western desert of Iraq in Najaf Province at latitude 31˚00' -32˚15' and longitude 43˚30' - 44˚30'. They are almost parallel to Euphrates River on the eastern edge of western desert. General direction for the distribution of springs coincides with that of faults running northwest-southeast. The Hydrogen sulfide, temperature, pH and electrical conductivity were investigated in these springs. The analyses indicated that the concentration of H2S decreased from northwest toward southeast which is attributed to the escape of this gas to the atmosphere during the flow of groundwater near or on the earth surface. The surrounding geologic conditions did not affect the temperature and pH of the springs. Electrical conductivity showed an increase from northwest towards southeast which reflects dissolving more ions from the rocks of the aquifer. The electrical conductivity and hydrogen sulfide concentration had reverse relationship.

  • 1196.
    al-Dahan, Saadi
    et al.
    Department of Geology, Faculty of Science, University of Kufa.
    M., Hussain Hussain
    Department of Geology, Faculty of Science, University of Kufa.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Hydrochemistry of springs, Najaf area, Iraq2015In: Journal of Environmental Hydrology, ISSN 1058-3912, E-ISSN 1996-7918, Vol. 23, article id 3Article in journal (Refereed)
    Abstract [en]

    Springs exist in southwestern Iraq at Najaf area in southwestern desert (latitude 31º 00 ̄ – 32º 15 ̄ and longitude 43º 30 ̄ – 44º 30 ̄). Two aquifers exist in the area. The first is composed of recent deposits while the second aquifer is of Miocene deposits. The latter is important because it contains huge quantities of groundwater. Water of these springs is slightly brackish and very hard. The predominant salt in the water of these springs is magnesium sulfate (MgSO4) and sodium chloride (NaCl). The water type is sulfate. Most of water springs (70%) are of marine water origin, while the minority (30%) are of continental water origin.

  • 1197. Aldeman, Sara
    et al.
    Antti, Helen
    Upplevelser av att leva med långvarig kroppslig smärta: en litteraturstudie2007Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1198.
    Aldenbo Rova, Tina
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Några nyp får man räkna med: En kvalitativ studie om hot och våld inom äldreomsorgen2016Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [sv]

    Syftet med uppsatsen var att beskriva de anställdas upplevelse av hot och våld samt få en fördjupad kunskap i hur verksamheten hanterar hot och våld. Detta ville jag göra för att bidra till en ökad kunskap om hur arbetssituationen kan se ut i äldreomsorgen. För att reda ut detta utförde jag en kvalitativ studie och intervjuade undersköterskor samt enhetschefer som alla arbetade på olika äldreboenden. Empirin analyserade jag med hjälp av tidigare forskning som visade på att hot och våld ökat främst inom vård-och omsorgsyrkena samt att hot och våld är ett dilemma för dessa yrkesgrupper. De arbetsmiljöföreskrifter jag använt mig av är systematiskt arbetsmiljöarbete samt våld och hot i arbetsmiljön. Vetenskapligt vedertagna teorier som jag använt mig av är Karaseks krav-kontroll och stödmodell samt Antonovskys begrepp KASAM.

    Samtliga informanter beskrev hot och våld som en individuell upplevelse från en uppkommen situation. Undersköterskorna liksom enhetscheferna kändetill i vilka situationer hot och våld uppstod. Rutinerna vad gäller riskbedömningar och handlingsplaner följs av alla, däremot fannsdet brister i avvikelserapporteringen trots att det var något som de ansåg som viktigt. Vidare visaderesultatet att samtliga informanter har lång erfarenhet av hot och våld samt att det är något som de kan hanterapå ett ansenligt sätt tack vare en lång och gedigen kunskap i bemötande. För att överhuvudtaget kunna hantera hot-och våldssituationer var det sociala stödet frånarbetskamraterna den viktigaste faktorn. Undersköterskorna kände sig trygga på arbetsplatsen trots hot och våld, förklaringen till det kan vara att de har en hög känsla av sammanhang i kombination med att arbetskraven samt egenkontrollen var höga. Hot ochvåld sågs inte direkt som ett arbetsmiljöproblem utan bedömdes vara omedvetna handlingar utförda av personer med exempelvis demenssjukdomar.

  • 1199.
    Aldenlov, Jens
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences. Luleå Technical University.
    Public Procurement of Railway Infrastructure Maintenance: A Linear Regression Analysis2019Conference paper (Refereed)
    Abstract [en]

    Swedish railway infrastructure maintenance has been outsourced through gradualexposure since 2002. The idea behind outsourcing was to reduce cost and improveefficiency. However, railway maintenance cost has increased faster than railwaymaintenance operations, resulting in neglected railway maintenance. Since railwayoperation is governed by the contract design the purpose of this paper was to explore therelationship between contract design and maintenance outcome within Swedish railwayinfrastructure maintenance. To explore this relationship linear regression analysis wasused. The result indicates that asset knowledge and accessibility to the track areimportant to consider for improving maintenance operations.

  • 1200.
    Aldenlöv, Jens
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Exploring Public Procurement of Swedish Railway Infrastructure Maintenance2019Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In 2002, Sweden started to outsource its railway infrastructure maintenance. Through gradual exposure (i.e. outsourcing one contract area at a time), the Swedish Transport Administration has developed its competence of being a client towards its contractors. The last contract was outsourced in 2014. In the last decade, the development of governance techniques and maintenance cost has not matched the increase in traffic. Due to an increased awareness in environmentally friendlier transportation, traffic is only expected to increase further in the coming years. Governance techniques and maintenance cost ultimately depends on the client-contractor relationship through public procurement. Hence, there is a need to understand public procurement of railway infrastructure maintenance. Therefore, the purpose of this thesis is to contribute to the knowledge of public procurement of railway infrastructure maintenance. Three separate studies were conducted. Study 1 was a literature review to explore and determine the state-of-the-art for the field of public procurement of railway maintenance. Study 2 was a linear regression analysis to examine the relationship between contract design and the output of maintenance in Sweden. Study 3 was an interview study in Sweden that explored what factors that supports or hinders collaboration in railway maintenance.

    The main results of these studies are that asset knowledge is important for both the client and the contractor. Through reliable asset knowledge, incentives and contracts can be designed to support governance and collaboration. Today, railway infrastructure maintenance is dominated by informal relationships that lack the support of formal partnering activities. When an informal relationship is supported by a formal structure it provides a basis for innovation. This formal structure should be centralized around gaining and sharing asset knowledge. By establishing such a system to increase the asset knowledge and supporting collaboration, public organizations of maintenance can provide a basis for the improvement of maintenance.

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