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  • Ek, Robert (Musician)
    Luleå University of Technology, Department of Arts, Communication and Education, Music and dance.
    In and around Berlin: concert during HCMF 2019, Huddersfield Contemporary Music Festival2019Artistic output (Unrefereed)
  • Neely, Gregory
    et al.
    Department of Psychology, Umeå University, Umeå, Sweden.
    Sörman Eriksson, Daniel
    Department of Psychology, Umeå University, Umeå, Sweden.
    Körning-Ljungberg, Jessica
    Department of Psychology, Umeå University, Umeå, Sweden, .School of Psychology, Cardiff University, Cardiff, United Kingdom.
    The impact of spoken action words on performance in a cross-modal oddball task2018In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 11Article in journal (Refereed)
    Abstract [en]

    In this study a cross-modal oddball task was employed to study the effect that words spokeneither non-urgently or urgently would have on a digit categorization task and if women wouldexhibit greater behavioral inhibitory control. The words were unrelated to the task itself, butrelated to the action required to complete the task. Forty participants (21 women) conducteda computerized categorization task while exposed to a sinewave tone as a standard stimulus(75% of the trials) or a to-be ignored word (press, stop) spoken either non-urgently orurgently as unexpected auditory deviant stimulus (6.25% trials for each category). Urgentwords had sharp intonation and an average fundamental frequency (F0) ranging from 191.9(stop) to 204.6 (press) Hz. Non-urgent words had low intonation with average F0 rangingfrom 103.9.9 (stop) to 120.3 (press) Hz. As expected, deviant distraction and longerresponse times were found by exposure to the word stop, but deviant distraction was notfound to be significant with the word press or due to intonation. While the results showedthat women had in general longer reaction times, there were no gender differences foundrelated to the deviant distraction caused by word or intonation. The present results do notsupport the hypothesis that women have greater behavioral inhibitory control, but there wasevidence that the meaning of the word could influence response times.

  • Broekhuizen, Ico
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Muthanna, Tone M.
    Norwegian University of Science and Technology, Trondheim, Norway.
    Leonhardt, Günther
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Viklander, Maria
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Urban drainage models for green areas: Structural differences and their effects on simulated runoff2019In: Journal of Hydrology X, ISSN 2589-9155, Vol. 5, article id 100044Article in journal (Refereed)
    Abstract [en]

    Mathematical stormwater models are often used as tools for planning and analysing urban drainage systems. However, the inherent uncertainties of the models must be properly understood in order to make optimal use of them. One source of uncertainty that has received relatively little attention, particularly for increasingly popular green areas as part of urban drainage systems, is the mathematical model structure. This paper analyses the differences between three different widely-used models (SWMM, MOUSE and Mike SHE) when simulating rainfall runoff from green areas over a 26-year period. Eleven different soil types and six different soil depths were used to investigate the sensitivity of the models to changes in both. Important hydrological factors such as seasonal runoff and evapotranspiration, the number of events that generated runoff, and the initial conditions for rainfall events, varied significantly between the three models. MOUSE generated the highest runoff volumes, while it was rather insensitive to changes in soil type and depth. Mike SHE was mainly sensitive to changes in soil type. SWMM, which generated the least runoff, was sensitive to changes in both soil type and depth. Explanations for the observed differences were found in the descriptions of the mathematical models. The differences in model outputs could significantly impact the conclusions from studies on the design or analysis of urban drainage systems. The amount and frequency of runoff from green areas in all three models indicates that green areas cannot be simply ignored in urban drainage modelling studies.

  • Brunnacker, Lena
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Short Carbon Fiber-Reinforced Thermoplastic Composites for Jet Engine Components2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    State-of-the-art aircraft engine manufactures aim to reduce theirenvironmental impact steadily. Thereby they attempt to increase engineefficiency, use new renewable fuel sources and most importantly aim toreduce component weight. While Titanium, Aluminum and continuousfiber reinforced thermosetting composites and superalloys prevail in thecurrent material selection, the present work desires to raise awareness fora novel group of materials; short carbon fiber reinforced thermoplasticcomposites (SCFRTPs). In this kind of composite short fibers givedimensional stability and strength while the thermoplastic matrix ensuresthe physical properties, even at temperatures up to 300°C.Even though in some applications these materials offer great potential tosave weight and cost, it is not clear if their properties suffice to be used indemanding areas of the aero engine and if they are still able provide costand weight reductions there.The present work therefore investigated potential aero-engine componentsthat could be replaced by SCFRTPs. With literature, manufacturer data andmaterial and process modelling approaches, it is shown that SCFRTPsmechanical and physical properties suffice for the selected component.Further it is shown that cost reductions up to 77% and weight savings upto 67% compared to the Ti-6Al-4V baseline component are possible.

  • Englund, Mia
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Fjellström, Lina
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Minskad personalomsättning med hjälp av intern employer branding: En fallstudie om hur ett känt företag inom telekombranschen kan minska personalomsättningen av kundtjänstmedarbetare2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A brand is one of the most important assets that an organization has. It is a complex collectionof experiences and images that belongs to the surrounding world and it can have a huge impacton the organization. Today, brands are used in various ways and in different areas. One of theseareas is employer brand. In order to strengthen the employer brand, organizations can workwith employer branding, which is a long-term strategy that can be applied both internally andexternally. By working with employer branding from the internal perspective, organization canreduce their employee turnover. This is especially important for organizations today, since theunemployment in Sweden is relatively low and the labour market belongs to the workers. Thisprovides a challenge for the future success of organizations, since it is the human capital inthese organizations that possess knowledge. In Sweden, one of the characteristics of thetelecom industry is that the customer consultants have a high percent of employee turnover.The purpose of this study is therefore to investigate how organizations within the telecomindustry can reduce employee turnover with the help of internal employer branding.To gain a deeper understanding of the purpose, this study was conducted as a qualitative, singleand imbedded case study where the empirical material was collected through semi structuredinterviews. The results of the study showed that the investigated organization did not have asustainable and distinct strategy regarding internal employer branding. This was demonstratedby the fact that the leadership did not have an homogenous direction and the employees andprevious employees did not share the organizations experience regarding their work to retainemployees, therefore the efforts did not get the desired effect. This can affect the employerbrand in a negative way and therefore it is crucial that organizations understand the importanceof internal employer branding and the components that affects the employer brand. There areno shortcuts in building an employer brand and retain employees, the organization has to beattentive to what the employees truly desire.

  • Friberg, Jakob
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Investigation of Metallic Dust formed on Steel Substrates in Solar Cell Sputtering Chambers2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Investigations have been done as of why dust particles appear in a circular pattern on the backside of solar cells produced in sputtering chambers at Midsummer AB. An experimental approach was conducted, where solar cells were produced at standard conditions and their backside studied by material analytical methods. The solar cells dust particles were analyzed by energy-dispersive x-ray spectroscopy and x-ray diffraction, deducing that they consisted of iron selenide (Fe0.89Se). Furthermore, the dust particles appear due to formation of a thin iron selenide film that cracks and delaminate upon cooling from process temperature to room temperature. Iron selenide film thickness was found by energy-dispersive x-ray spectroscopy to occur in a pattern with radial symmetry with respect to the cell center, correlating with the film delamination pattern. The reason to the film formation was due to selenium reacting with the substrate steel at high temperatures (>400 C) in deposition chambers having a selenium environment. The film delamination occurs at a critical film thickness at which stresses in the film is high enough for the film to yield and fracture.

    It was concluded that iron selenide film formation or delamination must be minimized in order to control dust particle formation. These two phenomena can be mitigated by protective substrate films, change of substrate material, selenium environment optimization or temperature profile optimization and should be researched further to find the most effective and viable solution.

  • Karlsson, Tobias
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Study on the impact of CNT or graphene reinforced interlaminar region in composites2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The interlaminar region is a contributing factor to the limited electrical conductivity of carbon fiber/epoxy composites. Consisting of electrically insulating epoxy matrix between conductive layers of carbon fiber, the interlaminar region prevents electrical interaction between the carbon fiber layers and electrical conduction in the through thickness direction.The interlaminar region in thin [0,0] carbon fiber/epoxy composites has been reinforced by carbon nanotubes (CNT) by two methods. First by aligned CNT forests from N12 Technologies and secondly by self-produced Buckypapers, porous CNT films, of different areal densitites. Two batches of laminates modified by aligned CNTs, having different curing conditions, and laminates modified with Buckypapers were manufactured. The laminates were evaluated by their electrical conductivity and electromagnetic interference shielding efficiency (EMI SE). The addition of external pressure to the laminates during curing brought an increase in longitudinal conductivity, a consequence of higher fiber packing. Also, both reinforcement methods increased the longitudinal conductivity through improved electrical interaction between the carbon fiber layers. However, only the Buckypaper reinforcement augmented the transversal conductivity significantly, acting as a highly conductive route in the interlaminar region. Both batches of aligned CNT modified laminates exhibited equal EMI SE, questioning the influence of the conductivity of the laminate on its EMI SE. Also, the increase in EMI SE brought by the aligned CNT forests were negligible compared to the reference. However, the reinforcement by Buckypapers proved successful, reaching -45/-50 dB at 1000 MHz, improving from 30 dB of the unmodified reference at the same frequency.

  • Weber, Fabian
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Optical Analysis of the Hydrogen Cooling Film in High Pressure Combustion Chambers2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    For performance optimisation of modern liquid cryogenic bipropellant rocket combustion chambers, one component which plays an important role in reducing the wall side heat flux, is the behaviour of the cooling film. At the Institute of Space Propulsion of the German Aerospace Center (DLR) in Lampoldshausen, hot test runs have been performed using the experimental combustion chamber BKM, to investigate the wall side heat flux which is -- among other factors -- dependent on cooling film properties. To gain more insight into the film behaviour under real rocket-like conditions, optical diagnostics have been applied. The chosen methods were shadowgraphy and OH* imaging producing optical data sets which are analysed in this study. In this context, a description of the necessary background information is given, concerning rocket combustion chambers, film cooling and optical diagnostics of O2/H2 combustion. The applied methodology for optical analysis is described, followed by a presentation of the results. During the test campaign, it became clear that the optical setup was not optimised for creating meaningful shadowgraphy recordings which is why the shadowgraphy data has to be treated as flame emission imaging.

    The behaviour of the gas layer adjacent to the chamber wall could be characterised based on qualitative (luminosity, LOx shadow, reflection, recirculation zone and flame shape) and quantitative (layer thickness, layer length, pressure conditions) analysis. The thickness could be identified for each load step and an average length of the layer was found as well. OH* imaging has been used supplementary to support the observations from the flame emission images. An in depth frame by frame analysis was not possible due to time constraints. However, the time averaged images yielded results in accordance to the flame emission and could give a relative figure for the temperature distribution in the combustion volume. An artefact in the data was found, stemming presumably from the image intensifier. This artefact needs to be researched for a future error reduction in the data of this and other campaigns. Additionally, the thickness of the layer suggested a correlation to the models for film cooling efficiency. Such a correlation could not be established. Nevertheless, the film cooling models show the same behaviour as the data obtained from the flame emission imaging. Finally, suggestions are given how the data analysis and the optical setup could be improved for future, similar campaigns.

  • Persson, Marcus
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Software Development and Qualification Testing of a CubeSat X-ray Monitor2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The CUBES (CUbesat x-ray Background Explorer using Scintillators) is a payload on the KTH student satellite MIST (MIniature STudent satellite) to evaluate Silicon Photo-multiplier technology and new scintillators such as GAGG (Gadolinium Aluminium Gallium Garnet, Gd3Al2Ga3O12) for future use in hard X-ray polarisation studies of Gamma-Ray Bursts. CUBES itself is designed to study the MIST in-orbit radiation environment by using a detector which is comprised of a silicon photomultiplier coupled to different scintillator materials. Three of these detectors will be mounted on the payload platform and then coupled to inputs of an Application Specific Integrated Circuit (ASIC) and connected to a Field-programmable Gate Array (FPGA) which will store and send data through the downlink on the MIST satellite to ground. This thesis covers the software development for the FPGA, together with two radiation tests of components and the preparation of these.

  • Bergman, Liza-Marie
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Edman, Ida
    Luleå University of Technology, Department of Health Sciences.
    Distriktssköterskors erfarenheter av samarbete med patientansvarig läkare vid palliativ vård i hemmet2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Många gånger är det distriktssköterskor som står patienter närmast och är patienternas talesperson men det krävs ett multiprofessionellt samarbete för att kunna se till alla behov och skapa förutsättningar för patienter att uppleva livskvalitet sista tiden i livet. Då fler väljer att dö hemma är det centralt att samarbetet mellan distriktssköterskor och patientansvarig läkare fungerar för att kunna erbjuda god vård. Syftet med denna studie var att beskriva distriktssköterskors erfarenheter av samarbete med patientansvarig läkare vid palliativ vård i hemmet. Distriktssköterskor med minst ett års erfarenhet inom palliativ vård i hemsjukvården deltog i studien. Datainsamling utfördes med semistrukturerade intervjuer av åtta distriktssköterskor och data analyserades med hjälp av kvalitativ innehållsanalys. Dataanalysen resulterade i fyra subteman: Frustrerande att behöva strida för samarbete; Kontinuiteten är bristande; Tidigt engagemang från läkare ger bättre vård samt Att tillsammans ligga steget före. Det övergripande temat var Att sträva efter bättre tillgänglighet av läkare för en trygg vård. Distriktssköterskor beskrev att läkare inte prioriterade palliativ vård i samma utsträckning som dem samt att det var brist på patientansvariga läkare. Individuella samt organisatoriska faktorer ligger till grund för kvaliteten på samarbetet och därmed också möjligheten att kunna erbjuda palliativa patienter en god och säker vård.

  • Nahar, Nazmun
    et al.
    BGC Trust University Bangladesh, Bidyanagar, Chandanaish, Bangladesh.
    Ara, Ferdous
    Department of Computer Science and Engineering, BGC Trust University, Bangladesh.
    Neloy, Md. Arif Istiek
    Department of Computer Science and Engineering, BGC Trust University, Bangladesh.
    Barua, Vicky
    Department of Computer Science and Engineering, BGC Trust University, Bangladesh.
    Hossain, Mohammad Shahadat
    University of Chittagong, Bangladesh.
    Andersson, Karl
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A Comparative Analysis of the Ensemble Method for Liver Disease Prediction2019In: Proceedings of International Conference on Innovation in Engineering and Technology (ICIET), 2019Conference paper (Refereed)
    Abstract [en]

    Early diagnosis of liver disease is very important in order to save human lives and take appropriate measure to control the disease. In several fields, especially in the field of medical science, the ensemble method was successfully applied. This research work uses different ensemble methods to investigate the early detection of liver disease. The selected dataset for this analysis is made up of attributes such as total bilirubin, direct bilirubin, age, sex, total protein, albumin, and globulin ratio. This research mainly aims at measuring and comparing the efficiency of different ensemble methods. AdaBoost, LogitBoost, BeggRep, BeggJ48 and Random Forest are the ensemble method used in this research. The study shows that LogitBoost is the most accurate model than other ensemble approaches.

  • Jaunky, Vishal Chandr
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Social Sciences.
    Jeetoo, Jamiil
    Department of Economics and StatisticsUniversity of Mauritius, Reduit, Mauritius.
    Rampersad, Shreya
    Department of Economics and StatisticsUniversity of Mauritius, Reduit, Mauritius.
    Happiness and Consumption in Mauritius: An Exploratory Study of Socio-Economic Dimensions, Basic Needs, Luxuries and Personality Traits2019In: Journal of Happiness Studies, ISSN 1389-4978, E-ISSN 1573-7780Article in journal (Refereed)
    Abstract [en]

    Mainstream economics perceive an individual as highly individualistic, presuming that he/she consumes goods in the most efficient way to optimize his/her level of happiness. This study attempts to explore the nexus between socio-economic dimensions, basic needs, luxuries and personality traits and happiness in Mauritius. Material consumption and happiness are projected to be positively and strongly related. This is usually illuminated in terms of the increased possibilities to satisfy basic needs and luxuries along with other motives which additional spending provides. Other instrumental aspects of consumption, such as its relative, community-based and hedonic magnitudes are accounted. Cross-sectional data are compiled from a household survey with a sample size of 1015 observations. To conduct the analysis, an ordered probit model is applied. The general conclusion is drawn upon the results that socio-economic indicators like educational attainment, residential location, family size, income in addition to the intermediate needs deprivation index, brand consciousness, fashion innovativeness, commercial interest, shopping enjoyment, hedonism, bandwagon effect and personality traits are significantly related to people’s happiness.

  • Boström, Margareta
    Luleå University of Technology, Department of Arts, Communication and Education.
    Fritidshemmets lärmiljöer: Fritidshemmets lärmiljöer ur specialpedagogiskt perspektiv2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Abstrakt Syftet med studien var att belysa fritidshemmets lärmiljöer med focus på hur specialpedagogiskt perspektiv kommer till uttryck i mötet med den fysiska och den sociala lärmiljön. Den fysiska och den sociala lärmiljön observerades på ett fritidshem. Det relationella specialpedagogiska perspektiv var det perspektiv som framträdde tydligast i relation till den sociala och fysiska lärmiljön. Det kategoriska perspektivet kan bli en konsekvens av organisationens bemanningspolitik och elevgruppernas storlek. Det kategoriska perspektivet kan även framträda i den visuellt tillgängliga fysiska lärmiljön. Dilemmaperspektivet blir synligt när gruppen delas och gruppen befinner sig i utemiljön. En del av resultatet i den här kvalitativa studien är att tiden är en styrande ramfaktor under en dag i fritidshemmet. En annan sak som framkom var att organisationens bemanning kan vara ett hinder till att alla elever får det stöd de behöver för att kunna vara delaktiga i aktiviteterna som fritidshemmet erbjuder till att uppnå läroplanens mål.

  • Pettersson, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Optimizing Deep Neural Networks for Classification of Short Texts2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master's thesis investigates how a state-of-the-art (SOTA) deep neural network (NN) model can be created for a specific natural language processing (NLP) dataset, the effects of using different dimensionality reduction techniques on common pre-trained word embeddings and how well this model generalize on a secondary dataset. The research is motivated by two factors. One is that the construction of a machine learning (ML) text classification (TC) model is typically done around a specific dataset and often requires a lot of manual intervention. It's therefore hard to know exactly what procedures to implement for a specific dataset and how the result will be affected. The other reason is that, if the dimensionality of pre-trained embedding vectors can be lowered without losing accuracy, and thus saving execution time, other techniques can be used during the time saved to achieve even higher accuracy.

    A handful of deep neural network architectures are used, namely a convolutional neural network (CNN), long short-term memory neural network (LSTM) and a bidirectional LSTM (Bi-LSTM) architecture. These deep neural network architectures are combined with four different word embeddings: GoogleNews-vectors-negative300, glove.840B.300d, paragram_300_sl999 and wiki-news-300d-1M.

    Three main experiments are conducted in this thesis. In the first experiment, a top-performing TC model is created for a recent NLP competition held at Kaggle.com. Each implemented procedure is benchmarked on how the accuracy and execution time of the model is affected. In the second experiment, principal component analysis (PCA) and random projection (RP) are applied to the pre-trained word embeddings used in the top-performing model to investigate how the accuracy and execution time is affected when creating lower-dimensional embedding vectors. In the third experiment, the same model is benchmarked on a separate dataset (Sentiment140) to investigate how well it generalizes on other data and how each implemented procedure affects the accuracy compared to on the original dataset.

    The first experiment results in a bidirectional LSTM model and a combination of the three embeddings: glove, paragram and wiki-news concatenated together. The model is able to give predictions with an F1 score of 71% which is good enough to reach 9th place out of 1,401 participating teams in the competition. In the second experiment, the execution time is improved by 13%, by using PCA, while lowering the dimensionality of the embeddings by 66% and only losing half a percent of F1 accuracy. RP gave a constant accuracy of 66-67% regardless of the projected dimensions compared to over 70% when using PCA. In the third experiment, the model gained around 12% accuracy from the initial to the final benchmarks, compared to 19% on the competition dataset. The best-achieved accuracy on the Sentiment140 dataset is 86% and thus higher than the 71% achieved on the Quora dataset.

  • Paniagua, Cristina
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Efficient Device-to-Device Service Invocation Using Arrowhead Orchestration2019In: IEEE Internet of Things Journal, ISSN 2327-4662Article in journal (Refereed)
    Abstract [en]

    The Internet of Things (IoT) enables interaction from real-world physical objects using sensors to the virtual world of computers and the Internet. The use of service-oriented architecture (SOA) is one step in the creation of basic and complex interactions between several sensors and actuators. However, the use of SOA-enabled technologies alone does not meet all requirements of how sensor and actuator systems could be integrated to create distributed monitoring and control applications. The centralized, traditional method of communication in wireless sensor networks via a gateway presents drawbacks that have to be addressed; device-to-cloud communication adds higher latency and higher power consumption and is less robust than the device-to-device communication approach. Moreover, all these characteristics reduce the scalability of the network, thus limiting the use of IoT in the industry. In this paper, the proposed method utilizes the Arrowhead framework orchestration system to generate service composition within a (wireless) network formed by IoT devices. The aim is to achieve efficient device-to-device service invocation to reduce the drawbacks of today's widely used device-to-cloud approach. The method in this paper performs efficient service composition for industrial IoT, including mapping SOA service composition in very small resource-constrained devices using the Arrowhead orchestration. The results presented in this paper at the service level can increase performance and robustness in fog computing on resource-constrained devices.

  • Westberg, Erik (Conductor)
    Luleå University of Technology, Department of Arts, Communication and Education, Music, media and Theatre.
    The Cloud of Unknowing2019Artistic output (Unrefereed)
  • Westberg, Erik (Conductor)
    Luleå University of Technology, Department of Arts, Communication and Education, Music, media and Theatre.
    POESIS: Bohuslän Big Band under ledning av Örjan Fahlström. Varbergs kammarkör samt sångare ur Erik Westbergs Vokalensemble under ledning av ErikWestberg.2019Artistic output (Unrefereed)
  • Soleimanmeigouni, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Ahmadi, Alireza
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Khajehei, Hamid
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Trafikverket, Luleå, Sverige.
    Investigation of the effect of the inspection intervals on the track geometry condition2019In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980Article in journal (Refereed)
    Abstract [en]

    In order to evaluate the railway track geometry condition and plan maintenance activities, track inspection cars run over the track at specific times to monitor it and record geometry measurements. Applying an adequate inspection interval is vital to ensure the availability, safety and quality of the railway track, at the lowest possible cost. The aim of this study has been to investigate the effect of different inspection intervals on the track geometry condition. To achieve this, an integrated statistical model was developed to predict the track geometry condition given different inspection intervals. In order to model the evolution of the track geometry condition, a piecewise exponential model was used which considers break points at the maintenance times. Ordinal logistic regression was applied to model the probability of the occurrence of severe isolated defects. The Monte Carlo technique was used to simulate the track geometry behaviour given different inspection intervals. The results of the proposed model support the decision-making process regarding the selection of the most adequate inspection interval. The applicability of the model was tested in a case study on the Main Western Line in Sweden.

  • Wikström, Catarina
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Lennestål, Ewa
    Luleå University of Technology, Department of Health Sciences.
    Sjuksköterskors upplevelser av svårigheter vid palliativ vård i hemmet2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Hemsjukvården ökar och allt fler palliativa patienter vårdas i hemmen. Det ställer stora krav och planering av sjuksköterskan i hemsjukvården för att få allt att fungera i det palliativa skedet då patienten är extra utsatt. Syftet är att beskriva sjuksköterskors upplevelser av svårigheter vid palliativ vård i hemmet. Metod: En kvalitativ studie med semistrukturerade intervjuer med åtta sjuksköterskor. Data analyserades med en kvalitativ innehållsanalys som resulterade i fyra kategorier och ett tema. Resultat: Kategorierna var; Främja trygga relationer för alla, vilket sjuksköterskorna betonade som en svårighet, och som fick stor betydelse för omvårdnaden och acceptans av situationen. Samverkan och kommunikation, skapade svårigheter att ge en god omvårdnad. Hänsyn till behov och önskemål, upplevde sjuksköterskorna var svårt när mångas behov ställdes mot varandra. Med Hemmet som arbetsplats, ansåg sjuksköterskorna att det var svårt att ge en säker och hänsynsfull omvårdnad. Den övergripande tematiseringen resulterade i begreppet; ”Att balansera på slak lina”. Slutsats: Sjuksköterskor i palliativ hemsjukvård upplever många svårigheter i sitt dagliga arbete. Resultatet av denna studie visar att det finns stor osäkerhet i hur den enskilda sjuksköterskan ska hantera detta.

  • Winnberg, Anton
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Waterproof packing for urban outdoor: Development of two waterproof backpacks intended for daily bike commute, urban strolls and travel2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Everyday, lots of people use some sort of bag to carry their daily equipment around, whether it is between home and work or any typ of spare time activity. This report covers a Master Thesis project in Industrial Design Engineering at Luleå University of Technology. The thesis concerns the development of two waterproof backpacks. These backpacks are developed in collaboration with the outdoor brand Lundhags, and intended for everyday bike commute, urban excursion and travel. Behind the initiative lies the desire of expanding the company’s product portfolio with a set of new waterproof daypacks within the category of urban outdoor. Also, to offer the customers the better protection of electronic devices such as laptops, surf tablets and smartphones, which are products that are prominent in our daily lives. 

    The project has followed a schedule and workflow influenced by versions of the design thinking process, with multiple iterations along the way. The work started off by studying competing products on the market, research and conduct knowledge on relevant topics through a literature review, study users needs and gather inspiration. User studies where carried out as interviews with both users and retailers, where the result was summarised as personas to represent the target audience. The contextual studies laid the foundation for the rest of the project, which further shifted towards more practical activities. Such as ideation sketching, building textile and paper mock-ups, concept development and concept evaluation. The result of this thesis project was the first version technical drawings for two backpack concepts. During the final weeks, these drawings were sent to the manufacturer for production of first version prototypes and production cost proposal. The bags are planned as a 16 liter and a 22 liter, where they offer internal options of organising the packing, as well external access pockets for smaller items to be close at hand.

  • Biswas, Munmun
    et al.
    Department of Computer Science and Engineering, BGC Trust University Bangladesh, Bidyanagar, Chandanaish, Bangladesh.
    Chowdury, Mohammad Salah Uddin
    BGC Trust University Bangladesh, Chandanaish, Chittagong-4381, Bangladesh.
    Nahar, Nazmun
    University of Chittagong, Bangladesh.
    Hossain, Mohammad Shahadat
    University of Chittagong, Bangladesh.
    Andersson, Karl
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A Belief Rule Base Expert System for staging Non-Small Cell Lung Cancer under Uncertainty2019In: Proceedings of 2019 IEEE International Conference on Biomedical Engineering, Computer and Information Technology for Health (BECITHCON), 2019Conference paper (Refereed)
    Abstract [en]

    Non small cell Lung cancer (NSCLC) is one of the most well-known types of Lung cancer which is reason for cancer related demise in Bangladesh. The early detection stage of NSCLC is required for improving the survival rate by taking proper decision for surgery and radiotherapy. The most common factors for staging NSCLC are age, tumor size, lymph node distance, Metastasis and Co morbidity. Moreover, physicians’ diagnosis is unable to give more reliable outcome due to some uncertainty such as ignorance, incompleteness, vagueness, randomness, imprecision. Belief Rule Base Expert System (BRBES) is fit to deal with above mentioned uncertainty by applying both Belief Rule base and Evidential Reasoning approach .Therefore, this paper represents the architecture, development and interface for staging NSCLC by incorporating belief rule base as well as evidential reasoning with the capability of handling uncertainty. At last, a comparative analysis is added which indicate that the outcomes of proposed expert system is more reliable and efficient than the outcomes generated from traditional human expert as well as Support Vector Machine (SVM) or Fuzzy Rule Base Expert System (FRBES).

  • Holmbom, Lina
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Jonsson, Sofia
    Luleå University of Technology, Department of Health Sciences.
    Fysisk aktivitet och välbefinnande hos elever i årskurs nio – En kvantitativ tvärsnittsstudie2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Fysisk inaktivitet är ett globalt hälsoproblem och världshälsoorganisationen, WHO, har beräknat att 81% av världens barn och ungdomar i åldern 5–17 år inte är tillräckligt fysisk aktiva. Specifikt gällande barn och ungdomar har fysisk aktivitet många positiva effekter. Dessa kan ses både på lång och kort sikt. Fysisk aktivitet har visat sig bidra till psykisk hälsa och en bättre upplevd livskvalitet. Syfte: Syftet med denna studie var att undersöka sambandet mellan fysisk aktivitet och välbefinnande hos elever i årskurs nio. Design och metod: Studien utfördes genom en kvantitativ tvärsnittsstudie i form av pappersenkäter. Resultatet från enkäterna analyserades med kvantitativ metod. Resultat: Enkätstudien visar att pojkar har skattat ett högre välbefinnande änflickor och annan. Det gick inte att se ett signifikant samband mellan vardagsmotion och skattat välbefinnande. Gällande den fysiska träningen och det skattade välbefinnandet kunde ett statistiskt samband påvisas. Även vid sammanslagning av den skattade fysiska träningen samt vardagsmotionen kunde ett signifikant samband ses. Slutsats: Det är viktigt att uppmuntra elever till fysisk aktivitet samt att arbeta för att stärka deras self-efficacy, självförmåga för ett ökat välbefinnande.

  • Andersson, Josefine
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Hur kan en befintlig centrumnära galleria omformas för att bidra till en mer attraktiv och hållbar stad?: En studie av Odenhuset i Trollhättan2019Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
    Abstract [en]

    During 1960 and 1970, several Domus department stores opened in the city centres of Sweden. By car, both local and long distance visitors could visit the Domus department store. As the external shopping centres and electronic commerce appeared, the number of visitors to the city malls (previously Domus department stores) has decreased. Nowadays, it is common for trade business to be forced to close the business because of the competition from external shopping centres and electronic commerce. This results in the fact that empty rooms nowadays are commonly found in city mall buildings. With the empty spaces, the city mall buildings have a limited range of goods and services. Less visitors to the city mall buildings result in less visitors to the place next to the city mall building, but also less visitors to the entire city centre.The purpose of this master thesis is to contribute with increased knowledge of how the existing city mall buildings can be redesigned as an idea and in its design. This because it is necessary to meet today’s challenges how the city mall buildings can contribute to a better sustainable and an attractive urban environment. The aim of this master thesis is to find a new design and function for Odenhuset in Trollhättan. The result should also be able to apply for similar existing city malls in central urban environments.The study was conducted by using the method called Research by Design. The method contains the three phases: pre-studies, design process and design analysis. Through Research by Design, it is possible to create a design proposal for the new function of the building where the proposal is based on scientific pre-studies. The first phase pre-studies includes site visits and literature studies. The city mall buildings that were visited for thestudy are either in the leading edge of Mixed Use or does the visited city mall building has many empty premises in the building.The conclusion of this master thesis is to find a new function for a centreclose city mall building, it is essential to accept the trade development. How trade has developed and changed is based on what human needs has looked like. Since external shopping malls and electronic commerce meetpeople nowadays needs better than the city malls does, the competition for customers has arisen. The result of the design proposal is therefore flexible and adaptable in order to make the city mall buildings once againbe able to meet new and future human needs. The design proposal and the new function of the city mall building should conveniently include different activities available for everyone. To combine different activities creates a wider range for the place. A wider range makes better conditions for the building to get more visitors and movement around the place.The design proposal gives space in the city mall building for activities thatmakes people’s everyday lives work better.

  • Arapantonis, Elpidoforos
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Data tampering in Vehicle CAN Bus networks2019Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The paradigm of the automotive industry has changed, over the course of the last10-15 years. Electronics and software, have introduced in many dierents parts ofa vehicle and the drive-by-wire it is taking over the vehicle functions. Connectivityfunctionalities are increasing in the context of the automotive industry as well. Allthe aforementioned parts have more than one common link. This thesis project willfocus on one of these links, which is the security. The focus will be the CAN busprotocol and specically, on investigating the implications of an adversary havingphysical access in a vehicle. An experiment will be contucted as part of this thesiswork, by using open source hardware (Arduino and Raspberry Pi) and a Man-inthe-middle (MITM) attack scenario, will be implemented. The application, whichwill perform the MITM attack (small scale CAN bus fuzzer) will be developedduring this project and it will be distributed as an open source software afterwards.

  • Betancourt Payán, Andrés Felipe
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Towards the Performance Assessment of aMapdrift Autofocus for a P-Band SARMission Implementation2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the context of the ESA BIOMASS mission in which for the first time, a P-Band SAR sensor isgoing to be mounted into a spaceborne system. With its penetration capability, it will contributeto the measurement of the biomass and carbon content in the Earth’s forests. An autofocusalgorithm is needed for the correction of phase errors introduced by the changing diffraction indexin the ionosphere. Because of the quickly changing nature of the ionosphere, defocusing has to bemeasured and corrected locally over several sections of a SAR capture.In this thesis, a deep introduction into phase errors is made having in mind that the ionosphereis expected to introduce time varying low frequency errors that can be constructed as a series ofquadratic curves. These quadratic phase errors introduce defocusing that is seen as blur and lossof contrast. An algorithm is proposed and tested for measuring this defocusing, while its strengthsand weaknesses are discussed.The idea of measuring defocusing is to try to recover the temporal phase function that introduceddefocusing in the first place. Here a method to recover this temporal phase function is introduced,and a thorough performance assessment of this retrieval is carried out. The variables involved thequality and reliability of this retrieval are studied one by one.

  • Björk, Siv Larsgren
    Luleå University of Technology, Department of Arts, Communication and Education, Education, Language, and Teaching.
    Tal i bråkformat: en analys av läromedel i matematik i årskurs sex2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • Viklund, Malin
    Luleå University of Technology, Department of Arts, Communication and Education.
    BYGGA kunskap: Ett praktiknära forskningsprojekt om hur lässtrategier kan inkluderas i undervisning i yrkesämnen på gymnasiet och vilka förutsättningar det skapar för eleverna2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the action research project was to understand how the teacher can combine vocational knowledge and include aspects of reading and see what interactions it creates in the classroom. Furthermore, how the teacher's linguistic support was made visible in the students' own texts and in the students' thoughts about the teaching based on focus group interviews is analyzed. Participants in the study consisted of pupils in the upper secondary school who studied the specialization Community building and the Environment at the Technology program. The students are not always aware of which strategies they use when reading a factual text. The result, however, shows that students who have received vocational teaching that include reading strategies have a greater familiarity with the subject’s content and subject-specific concepts. The teacher's work on including reading created interactions that sparked student engagement and gave the students more opportunities to deliberately choose a strategy when reading a factual text.

  • Bergman, Åsa
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Warnström, Ivy
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Faktorer av betydelse för patientsäker kommunikation vid telefonrådgivning på hälsocentraler: distriktssköterskors och sjuksköterskors perspektiv2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Abstrakt

    Telefonrådgivning är ett snabbt växande område som involverar allt fler sjuksköterskor och distriktssköterskor. Särskilt på hälsocentraler är telefonrådgivning ett nytt och allt mer omfattande arbetsmoment. En god kommunikation mellan sjuksköterska och patient kan förstärka patientsäkerheten vid telefonrådgivning. Syftet med studien var att undersöka faktorer av betydelse för patientsäker kommunikation vid telefonrådgivning på hälsocentraler utifrån distriktssköterskors och sjuksköterskors perspektiv. Metoden som använts är en tvärsnittsstudie, där en frågeenkät skickades ut via mail med länk till Google forms, till 70 distriktssköterskor och sjuksköterskor som arbetar på hälsocentraler i Norrbotten. Av de 70 enkäter som skickades ut besvarades 51, vilket gav en svarsfrekvens på 72,9%. Resultat visade att utbildning i telefonrådgivning gör att upplevelsen av stress minskar, distriktssköterskor och sjuksköterskor värderar erfarenhet som en av de viktigaste faktorerna för patientsäker kommunikation. Datoriserat beslutstöd, kunskap om samtalsprocessen, systematisk utveckling av samtal samt uppföljning och utvärdering av egna råd är andra faktorer av betydelse för patientsäker kommunikation. Slutsatser är att patientsäker kommunikation vid telefonrådgivning nås genom regelbunden utbildning och utveckling i kommunikationsfärdigheter samt tillgång till rätt stöd.

  • Karlsson, Linda
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Lindberg, Anna
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Sjuksköterskors upplevelser av att arbeta med Lifecare samordnad planering inom primärvård: En fokusgruppsstudie2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Lifecare samordnad planering är ett IT-stöd som har till ändamål att upprätta en oavbruten vård- och omsorgskedja mellan vårdaktörer och därigenom främja personcentrerad vård, stärka vårdkvalité och effektivisera vårdverksamhet. Syftet med studien var att beskriva sjuksköterskors upplevelser av att arbeta med Lifecare samordnad planering inom primärvård. Fokusgruppsstudien har en kvalitativ forskningsmetod där datainsamling genomfördes genom två fokusgruppsintervjuer med totalt åtta deltagare varav fyra deltagare i varje grupp. Studiens deltagare utgjordes av fyra sjuksköterskor och fyra distriktssköterskor som arbetade på två hälsocentraler inom Region Norrbotten. Intervjuerna analyserades med kvalitativ innehållsanalys som utfördes induktivt med en manifest ansats. Resultatet visade att samordningsansvaret innebar ett stort ansvar, att samverka med andra vårdaktörer och att samordna för patienter som primärvården inte var behandlingsansvariga för kunde vara svårt. Det upplevdes en brist på kunskap hos andra vårdaktörer vilket bidrog till merarbete. Samordningsansvaret och arbetet med Lifecare innebar en stor omställning som var både stressig och tidskrävande. Mer tid ägnades åt Lifecare än vad hälsocentralen fick betalt för och det var många som arbetade övertid. Lifecare som IT-stöd upplevdes obearbetat vilket försvårade det dagliga arbetet. Slutligen visade resultatet att för en lyckad samordning som skapade patienttrygghet krävdes ett gott samarbete mellan olika vårdaktörer och med delaktighet från patienten. Konklusionen är att arbetet med Lifecare samordnad planering behöver förbättras.

  • Gupta, Dipankar
    et al.
    Department of Computer Science and Engineering, Port City International University, Chattogram, Bangladesh.
    Hossain, Emam
    Department of Computer Science and Engineering, University of Chittagong, Chattogram, Bangladesh.
    Hossain, Mohammad Shahadat
    University of Chittagong, Bangladesh.
    Andersson, Karl
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Hossain, Sazzad
    Department of Computer Science and Engineering, University of Liberal Arts Bangladesh, Dhaka, Bangladesh.
    A Digital Personal Assistant using Bangla Voice Command Recognition and Face Detection2019In: Proceedings of IEEE International Conference on Robotics, Automation, Artificial-Intelligence and Internet-of-Things 2019, 2019Conference paper (Refereed)
    Abstract [en]

    Though speech recognition has been a common interest of researchers over the last couple of decades, but very few works have been done on Bangla voice recognition. In this research, we developed a digital personal assistant for handicapped people which recognizes continuous Bangla voice commands. We employed the cross-correlation technique which compares the energy of Bangla voice commands with prerecorded reference signals. After recognizing a Bangla command, it executes a task specified by that command. Mouse cursor can also be controlled using the facial movement of a user. We validated our model in three different environments (noisy, moderate and noiseless) so that the model can act naturally. We also compared our proposed model with a combined model of MFCC & DTW, and another model which combines crosscorrelation with LPC. Results indicate that the proposed model achieves a huge accuracy and smaller response time comparing to the other two techniques.

  • Emmersköld, Fredrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Wireless Site Survey Analysis Best Western Hotels Malmia2019Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
  • Näslund, Agnes
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Vilka effekter har jämförelsesidor givit för konkurrensen på bolånemarknaden: Nationalekonomisk kandidatuppsats2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    After the financial crisis, several comparison websites have emerged for private lenders to enable comparison on mortgage terms. The idea behind the comparison pages is that they should be used by the private borrower. On June 1, 2015, a new directive emerged from the Swedish Financial Supervisory Authority to the credit institutes that instead of the list interest, the average interest rate that the lenders offer their customers should be the one published, in order to further increase the transparency of the price. The purpose of this study is to investigate whether competition in the mortgage market has improved after the introduction of the comparison websites and the effects of the increased price transparency. In order to investigate the competition on the mortgage market, the theory of market forms and the Herfindahl-Hirschman Index has been applied. The result of the study shows that the concentration of competition has increased over time. This study also shows that the comparison pages have contributed to increased price transparency that has contributed to consumers information about the market. This study is limited to the Swedish mortgage market. 

  • Högström, Karl
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Spontant organiserade frivilliga i samverkan: en studie om en spontanfrivillighetsinsats för att underlätta vid brandbekämpning i skogarna kring Kårböle och Färila i Ljusdals kommun sommaren 20182019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna uppsats fokuserar på att undersöka en situation som inte hör till vardagen, hur spontanfrivilliga arbetat, agerat och knutit band med varandra vid en katastrofsituation. Att berätta deras historia och med sociologiska glasögon se på hur detta utvecklade sig. Det hela utspelar sig sommaren 2018 i skogarna utanför Färila i Ljusdals kommun i Gävleborgs län och handlar om en grupp människor, spontanfrivilliga, som tar egna initiativ och skapar en omfattande apparat med funktioner som ett mellanstort företag på bara några dagar, för att understödja brandmän och andra vid den näst största skogsbranden i Sverige i modern tid. Sociologen Robert D. Putnam (2006, ss. 121-122) skriver i sin bok Den ensamme bowlaren att ”det sociala kapitalet är knutet till nätverk av samhörighet – man arbetar tillsammans”. Putnam betonar vikten av närsamhället och dess roll när det kommer till det sociala engagemanget. Interaktionen mellan människor. Åtta respondenter har intervjuats, varav sex spontanfrivilliga, en brandvärnsman och en hemvärnsman. Dessa har fått berätta om sina upplevelser och hur de sett på det som hänt. Detta har resulterat i en narrativ analys av deras berättelser. Dessa har sedan analyserats med hjälp av teorier kring närsamhälle, attribution och interaktionsritualer. Den teoretiska delen avhandlar närsamhällets inverkan på det sociala engagemanget, attributionsteorins fokus på tolkning av varför någon gör som den gör och slutligen interaktionsritualer – de mikrohändelser som skapar emotionell energi. Resultatet visar på en samlad bild av hur resultatfokuserade, sammansvetsade och energiska alla de människorna var, som spontant ställde upp för att hjälpa till att bekämpa elden på det sätt de kunde, genom att vara behjälpliga i bakgrunden. Man kan, utifrån resultatanalysens konklusion, diskutera frågor som handlar om hembygd, känslor, gemenskap och nätverkande. Här ser vi kraften, viljan och energin i det som det gemensamma målet klarar av att åstadkomma.

  • Tole, Ilda
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Habermehl-Cwirzen, Karin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Cwirzen, Andrzej
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Optimization of the Process Parameters Controlling the Degree of Amorphization during Mechanical Activation of Clay Using the Taguchi Method2019In: 1st International Conference on  Smart Materials for Sustainable Construction—SMASCO 2019, Luleå, Sweden, 10–12 December 2019, Proceedings, 2019, Vol. 34Conference paper (Refereed)
    Abstract [en]

    Mechanical activation in a planetary ball mill (BM) is an environmentally friendly process able to enhance the chemical and pozzolanic activity of natural clays. Those materials can be used as supplementary cementitious materials (SCMs) to partially replace Portland cement in concrete. The process parameters of the BM are directly related to the degree of amorphization and thus to the enhancement of the chemical activity. Design of experiments (DOE) is a well-known statistical tool, which can assist in selecting optimized conditions and in obtaining systematic data. However, full factorial design requires a large number of experiment. Taguchi method is based on the use of an Orthogonal Array (OA) to evaluate optimization of the selected factors but with less required experiments. In this study, three factors, each on 2 levels, were selected: ball to powder ratio (B/P) with level 3 and 25, time of grinding with level 5 and 20, and water to powder ratio (W/P) with level 0 and 1. The degree of amorphization (DOA) was selected as the main response for the Taguchi method. DOA was calculated as the ratio between the integral intensities of the main peak of the kaolinite [001] before and after grinding. For dry grinding, the predicted optimized value of DOA complied with the experimental results. Maximized DOA value was achieved for B/P equal to 25 and the grinding duration of 20. This method can be a valuable tool to predict the amorphization degree of minerals present in the natural clay, leading to the optimization of the mechanical activation process.

  • Öhman, May-Britt
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Social Sciences. Royal Institute of Technology, KTH.
    Taming Exotic Beauties: Swedish Hydro Power Constructions in Tanzania in the Era of Development Assistance, 1960s - 1990s2007Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This study analyses the history of a large hydroelectric scheme – the Great Ruaha power project in Tanzania. The objective is to establish why and how this specific scheme came about, and as part of this to identify the key actors involved in the decision-making process, including the ideological contexts within which they acted. Although the Tanzanian actors and the World Bank (IBRD) are discussed, main focus is on the Swedish actors on project level.Kidatu, the first phase of the Great Ruaha power project (constructed between1970-1975), became the first large-scale hydropower station in Tanzania. As such, it paved the way for Tanzanian entrance into the Big Dam Era and significant changes within the Tanzanian landscape. As well as the dry river bed at Kidatu, and the small reservoir that precedes it, the Great Ruaha power project also involved the creation of a huge artificial lake, the Mtera reservoir. The Kidatu hydropower station was the first large undertaking within Swedish bilateral aid, and implied the takeover of control of hydropower construction in Tanzania by Swedish enterprises, replacing the enterprises of the former colonial power. A hydropower plant is a complex technoscientific artefact. The construction of a hydropower plant is preceded by a large number of technological choices, scientific prestudies and estimations of costs and revenues. A hydropower plant is also a complex social creation, and is as such filled with social actors engaged in conflicts, compromises and power structures. The decision to construct Kidatu hydropower station was a result of negotiations and activities within what is called “development assistance”. This brings in yet another dimension, the political one, involving export and import of technology, foreign capital, and foreign influence in decision-making processes, as well as ideas about how to bring development and progress to a people supposed to be living in “poverty and misery”. The study is divided into three main parts. The first part analyses the context of Swedish development assistance in the support to the construction of hydropower plants. This part discusses Swedish state-supported hydropower exploitation of indigenous people’s territory within Sweden’s borders in the 20th century and the background of Swedish development assistance, from the 1950s to the early 1960s. The second part analyses the event of Swedish development assistance entering Tanzania and the Great Ruaha power project, with the main focus being on the period 1965 – 1970. The third part is an analysis of the technoscientific basis for the decisions taken to implement the Great Ruaha hydropower scheme. Main focus is on the period 1969-1974, discussed against the backdrop of precolonial and colonial studies. While focus is on the 1960s and 1970s, in both part two and three events in the 1980s and 1990s are discussed. The study shows that although Sweden was not a colonial power in Tanzania, colonial imagery, and relations to the colonial era, as well as Sweden’s background of internal colonialisation, exerted an influence on the decision-making process and the actors involved in the Great Ruaha power project.The study is mainly based on archival sources, complemented with oral sources from Tanzania and Sweden. Recognizing the complexity of large-scale hydropower and the attempts to control watercourses that large scale hydropower necessitates, in the specific context of decolonisation and development assistance that the decision-making process behind the Great Ruaha hydropower scheme reveals, the analysis of the actors involved is based on feminist and postcolonial perspectives.

  • Sissakian, Varoujan
    et al.
    Lecturer, University of Kurdistan, Hewler, KRG, Iraq. Private Consultant Geologist, Erbil, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Geology, Geomorphology, Tectonics and Geography of the Tigris Basin2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 291-314Article in journal (Refereed)
    Abstract [en]

    The geography, geomorphology, tectonics, stratigraphy and economic potentials of areas alongside the Tigris River and its tributaries are given with emphasis on Iraqi parts. The river runs mainly in the Mesopotamian Plain, whereas its tributaries run in different tectonic zones with different characters. Accordingly, the Quaternary sediments being dominated by alluvial plain sediments cover large parts of the river course, whereas the tributaries run through areas covered mainly by different rocks types of Neogene age. The main economic potential is the existing oil fields, sulphur and limestone deposits for cement industry.

  • Sissakian, Varoujan
    et al.
    Lecturer, University of Kurdistan, Hewler, KRG, Iraq. Private Consultant Geologist, Erbil, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Geography, Geomorphology, Stratigraphy and Tectonics of the Euphrates River Basin2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 315-337Article in journal (Refereed)
    Abstract [en]

    The geography, geomorphology, tectonics, stratigraphy and economic potentials of the Euphrates river basin are given with emphasis on Iraqi parts. The course of the river inside Iraq runs mainly in the Mesopotamian Plain, whereas basin of the river is located in different tectonic zones with different characters. Accordingly, the Quaternary sediments being dominated by the alluvial plain sediments cover large parts of the river’s course, whereas the basin area is covered mainly by different rocks types of different ages. The main economic potentials are the existing oil fields, limestone deposits for cement industry and many non-metallic deposits.

  • Abdullah, Mukhalad
    et al.
    Private Engineer, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Water Resources Projects in Iraq: Main Drains2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 275-281Article in journal (Refereed)
    Abstract [en]

    Iraq has a unique system of drainage. Soil texture, groundwater depth, water quality and other factors lead to the adaption of getting rid the drainage water away to the sea in order to control water quality. The system of drainage is not completed yet, however, the backbone of the system, which is Main Outfall Drain (MOD) was completed in 1992. Other main drains were completed and connected and others are still in progress of implementation where the most important drain after MOD is Eastern Euphrates Drain.

  • Abdullah, Mukhalad
    et al.
    Private Engineer, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Water Resources Projects in Iraq: Medium and Small Storage Dams2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 283-289Article in journal (Refereed)
    Abstract [en]

    Many medium and small dams were built in Iraq. These dams are distributed in three major areas. First is the northern area where many dams built in the period after 2003, even there are some that built in 1980s. Second, is the dams built in the eastern valleys, but these prove to be inefficient due to high rate of sedimentation even in the live storage. Third, is the dams in the western desert. These dams were  highly exploited in 1970s and 1980s to harvest as much as possible in this large and promising area and providing the livelihood conditions to settle people. The area has no more projects due to security issues.

  • Abdullah, Mukhalad
    et al.
    Private Engineer, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Water Resources Projects in Iraq: Irrigation Projects on Tigris River Tributaries2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 231-247Article in journal (Refereed)
    Abstract [en]

    There are five tributaries feeding Tigris River inside Iraq, on these many large and small projects were developed. Two kinds of projects can be distinguished, first the projects of complementary irrigation or semi-rain feed area for agriculture, and example of these projects is Kirkuk, Hawija, Eski-Kalak and small projects in mountainous area. The second group is the projects that depend mainly on irrigation, examples of that are the projects in lower Diyaa. Unfortunately, there was no exploitation of lands enough comparing with the available resources in Great Zab territories.

  • Abdullah, Mukhalad
    et al.
    Private Engineer, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Water Resources Projects in Iraq: Irrigation Projects on Tigris2019In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 4, p. 201-230Article in journal (Refereed)
    Abstract [en]

    Along Tigris River reach inside Iraq, many large and small projects of irrigation were built. These projects depend on gravity flow or pumping. Starting from Jazeera project then small projects downstream Fatah, where these feed by pumping. After Samarra scheme, the important Ishaqi project, then after Baghdad, the projects of Nahrawan, Middle-Tigris and Dalmaj. The most important branch from Tigris is Gharraf Canal, which is not exploited yet, although plans were prepared decades ago. Downstream Kut Barrage, several projects are especially on the right side of Tigris. Finally, Shatt Al-Arab project which has a unique importance as it provide the solution for municipal need and save the orchards of dates in Basra.  

  • Rentzelos, Theofanis
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Numerical Investigation of Rock Support Arches2019Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The Garpenberg mine, owned by the Boliden Mining group, has established a trial area at Dammsjön orebody in order to examine the possibility of increasing the productivity of the mine. The mine uses the rill mining method with a current rill height of 15 m. In order to increase the productivity, the mine is examining the possibility of increasing the height of the rill. The trial area is located at 882 m depth surrounded by dolomite on the hangingwall and quartzitic rock on the footwall side. Rock support arches have been installed, in addition to the regular support pattern, to test their effectiveness on stabilizing the ground around the drifts. The arches have been installed in every 6 m and every 3 m in different parts of the test area. Rock samples from the trial area were brought to the university laboratory for testing. The data gathered from the laboratory tests along with the data from the monitoring of the trial area were used to develop a calibrated numerical model. A three-dimensional (3-D) model was therefore created, by using the FLAC3D numerical code. After the calibration of the model a parametric study was conducted for different rill heights and different arch spacing to investigate the performance of the arches. Specifically, the case of no arch installation along with the cases of an installed arch every 6 m and 3 m were tested, for the rill heights of 15 m, 20 m, 25 m and 30 m. The study concluded that the arches assisted in reducing the ground convergence in the production drift. The results also showed that the total height of the rill bench yields regardless of its height. After the yielding, the rockmass can no longer support itself and caves under its own weight. The larger the rill height, the larger the volume of loose rock that has to be supported and thus, higher the convergence. Furthermore, it was also observed that, significant amount of convergence in the production drift occurred during the drifting of the top drive and less during the stoping of the rill bench. This indicates that, the timely installation of the arches is an important criterion for their performance.

  • Sandberg, Oskar
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Nutti, Kenneth
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    CA UIM: Övervakning för Sametingets nätverk2019Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Det globala konsultföretaget CGI är leverantör för Sametingets nätverk. Behovet av en förbättrad övervakning på Sametingets nätverk efterfrågades av CGI. Genom att förnya och förbättra övervakningen säkerställs en snabbare felsökning och en högre tillgänglighet. Plattformen som skulle användas för att förverkliga målet heter CA Unified Infrastructure Management (CA UIM).

     

    Eftersom slutprodukten skulle övervaka en skarp miljö så började arbetet med att upprätta en testmiljö där experiment kunde utföras. En liten del av arbetet bestod av att kartlägga det nätverk som skulle övervakas. Det huvudsakliga arbetet gick ut på att lära känna programvaran. UIM bygger på att prober utför insamling av data som sedan transporteras vidare till en gemensam databas för den specifika domänen. Databasen kan i sin tur leverera data till exempelvis dashboards på front-end sidan. 

    Följande prober har använts i vårt arbete:

    • Net_Connect – Använder ICMP för att bekräfta en enhets tillgänglighet.

    • Interface_Traffic - Övervakar nätverkstrafiken med SNMP-agenter.

    • CDM - Ansvar för övervakningen av CPU, disk och minnesutnyttjande på servrar.

     

    Efter att designen av våra dashboards var färdigställda och övervakningen fungerade så gick vi över till den skarpa miljön och upprättade samma koncept där. Arbetet presenteras sedan för CGI i Kiruna med positiva reaktioner.

  • Cabrati, Gülcan
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Hammar, Rebecka
    Luleå University of Technology, Department of Health Sciences.
    Patienters upplevelse av hemodialysbehandling: en litteraturstudie2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vid kronisk njursjukdom är funktionen hos njurarna försämrad. Detta behandlas vanligtvis med hemodialys, som gör det arbete som njuren inte längre klarar av. Behandlingen är livslång och kräver mycket tid då det sker flera gånger i veckan. Syftet med studien var att beskriva patienters upplevelser av hemodialysbehandling. Litteraturstudien innehållande tolv kvalitativa artiklar har analyserats med kvalitativ innehållsanalys med manifest ansats. Samtliga artiklar var publicerade på engelska mellan 2009-2019 och hade hög respektive medel kvalitet. Resultatet är presenterat utifrån fyra kategorier: Att livet begränsas, som innebar att patienterna upplevde sig vara begränsade och hade brist på frihet. Att leva med en försvagad kropp, innebar att patienternas välbefinnande minskade på grund av behandlingens symtom såsom trötthet, svaghet och illamående. Att vara fast och inte ha valmöjligheter, innebar att dialysen var något patienterna behövde göra vare sig de ville eller inte och att de var beroende av behandlingen och fick ingen ledighet ifrån detta. Sist framkom att acceptera och vara gynnsamt inställd, som innebar att vissa patienter accepterat behandlingen, det fanns en tacksamhet till dialysen och behandlingen var anledningen till att de var vid liv. Denna litteraturstudien gav en ökad uppfattning om patienters upplevelser, det skulle kunna underlätta för vårdpersonal att bemöta patienten på ett professionellt sätt. Vidare forskning skulle kunna göras på KASAM kopplat till hemodialyspatienter samt vidare forskning på förbättringsarbeten inom vissa områden kring hemodialyspatienter. Exempelvis inom bemötandet samt någon slags form av sysselsättning som underlättar tiden på dialysavdelningen.

  • Johansson, Josefin
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Dahlberg, Amanda
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Hemlösa personers upplevelser av Hälso- och sjukvård: en kvalitativ litteraturstudie2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Hälso- och sjukvårdspersonal påträffar personer som lever i olika former av utsatthet i sitt arbete. Hemlösa personer är en utsatt grupp som kämpar mot unika svårigheter och har därmed även unika vårdbehov. Hemlösa personer är därför en utmanande samhällsgrupp att vårda. Hälso- och sjukvårdspersonal upplever en osäkerhet i att vårda hemlösa personer och behöver en ökad kunskap kring deras komplicerad hälsoproblem. Syftet med litteraturstudien var att beskriva hemlösa personers upplevelser av hälso- och sjukvård. En kvalitativ manifest innehållsanalys med induktiv ansats användes eftersom inifrånperspektiv med fokus på människors upplevelser studerades. Tolv vetenskapliga kvalitativa artiklar ingick i analysen. Resultatet visade att det var svårt att få tillgång till hälso- och sjukvård samt följa rekommendationer. Hemlösa personer kände sig stigmatiserade och blev behandlade som om de inte vore en människa samt att hälso- och sjukvårdspersonal kunde skapa en vårdmiljö som gav stöd och trygghet genom ett respektfullt bemötande. Hälso- och sjukvårdssystem behöver utvecklas för att hemlösa personer ska få tillgång till god individanpassad vård. Dagens hälso- och sjukvårdssystem är inte utformad för denna utsatta samhällsgrupp. I klinisk praxis behöver hälso- och sjukvårdspersonal reflektera över normer och värderingar samt ökad kunskap och utbildning om denna utsatta samhällsgrupp för att kunna arbeta med de unika utmaningar som medföljer.

  • Rolia, Florivel
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Renblom, Malin
    Luleå University of Technology, Department of Health Sciences.
    Sjuksköterskans ledarskap och dess inverkan på omvårdnadsarbete: en litteraturöversikt2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I arbetet som legitimerad sjuksköterska ingår ett ledarskap som går ut på att sjuksköterskan har en arbetsledande funktion inom ett vårdteam. Syftet med denna litteraturöversikt var att sammanställa kunskap om sjuksköterskans ledarskap och vilken betydelse det har i omvårdnadsarbetet. Två frågeställningar formulerades för att precisera syftet. En integrerad kunskapsöversikt utfördes och artiklar söktes i databaser samt manuellt. Litteratursökningen resulterade i tolv vetenskapliga artiklar som analyserades enligt en metod av Whittemore och Knafl. Frågeställning ett var: vilka egenskaper är önskvärda hos sjuksköterskan för att vara en god ledare?  I resultatet till frågeställning ett framkom fyra områden: att ha en etisk medvetenhet, att ha självkännedom, att kunna bygga relationer samt att kunna leda mot utveckling. Frågeställning två var: vilken betydelse har sjuksköterskans ledarskap för omvårdnadsarbetet? I resultatet till frågeställning två framkom tre områden: det leder till patientnöjdhet, det påverkar arbetsmiljön samt det leder till kvalitetsökning av vården. Vidare forskning i vilket stöd sjuksköterskan behöver i sin ledande roll hade varit intressant.

  • Larsson, Sofia
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Larsson, Ellinora
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Upplevelser av att återhämta sig från Anorexia Nervosa: En litteraturstudie2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Persson, Tina
    Luleå University of Technology, Department of Arts, Communication and Education, Education, Language, and Teaching.
    Jag vill bara att det ska vara lagom svårt!: Anpassas skolans läroplan utifrån varje elevs unika förmåga?2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • Pamidi, Taraka Rama Krishna
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Johansson, Örjan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Löfqvist, Torbjörn
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Energy Efficient Fibrillation of Cellulose Fibers using an Ultrasound Reactor2019Conference paper (Refereed)
    Abstract [en]

    The pulp and paper industry is in continuous need for energy-efficient production processes. Therefore, there is a focus in reducing electrical energy use in the production of paper.  The most energy demanding processes are related to fibrillation, which in some cases use up to 80% of required electrical power, with a net efficiency of 1%. The presented work focus on ultrasound controlled cavitation in concentrating the processing energy to provide an energy efficient development of cellulose fibers. The objectives are to develop a scalable cavitation reactor to obtain energy-efficient fibrillation of cellulose fibers aiming at reducing the energy use by 50%. Our goal is to develop a methodology based on multiphysic simulation for the design of an alternative refiner based on ultrasound cavitation. The reactor concept is of a flow through type where cavitation bubbles are initiated in the fiber suspension by the pressure release when the pulp flow through a venturi nozzle. The induced cavitation bubbles are collapsed by high intensity ultrasound at resonant frequencies. The collapsing bubbles and their associated shock waves modify the fiber wall properties which enables fibrillation.  Energy efficient fibrillation of cellulose fibers is therefore possible to achieve through an optimized combination of hydrodynamic and ultrasonic controlled cavitation. Initial results shows a positive effect on fiber quality. However, further optimization of process parameters like temperature and static pressure is required.

  • Public defence: 2019-12-20 10:00 F1031, Luleå
    Gerdes, Mike
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Predictive Health Monitoring for Aircraft Systems using Decision Trees and Genetic Evolution2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Reducing unscheduled maintenance is important for aircraft operators. There are significant costs if flights must be delayed or cancelled, for example, if spares are not available and have to be shipped across the world. This thesis describes three methods of aircraft health condition monitoring and prediction; one for system monitoring, one for forecasting and one combining the two other methods for a complete monitoring and prediction process. Together, the three methods allow organizations to forecast possible failures. The first two use decision trees for decision-making and genetic optimization to improve the performance of the decision trees and to reduce the need for human interaction. Decision trees have several advantages: the generated code is quickly and easily processed, it can be altered by human experts without much work, it is readable by humans, and it requires few resources for learning and evaluation. The readability and the ability to modify the results are especially important; special knowledge can be gained and errors produced by the automated code generation can be removed.

    A large number of data sets is needed for meaningful predictions. This thesis uses two data sources: first, data from existing aircraft sensors, and second, sound and vibration data from additionally installed sensors. It draws on methods from the field of big data and machine learning to analyse and prepare the data sets for the prediction process.