liu.seSearch for publications in DiVA
1234567 1 - 50 of 412
rss atomLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
  • Mishmish, Duaa
    Linköping University, Department of Biomedical Engineering.
    Optimizing Photodynamic Therapy Efficacy through Transdermal Oxygenation Modulation: Investigating the Impact of Topical Hydrogen Peroxide2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Download full text (pdf)
    Duaa Mishmish
  • Nilsson, Maja
    Linköping University, Department of Biomedical Engineering.
    Mathematical Modelling of Celiac Disease: Transition from consuming gluten to adopting a gluten-free diet2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Celiac disease is an autoimmune disease that affects approximately 0.5-1% of the global population and damages the small intestine when gluten is ingested. The disease is believed to have existed since wheat was first introduced into the diet, but much about it remains unknown, and the only current treatment is to adhere to a lifelong gluten-free diet. It is not uncommon for individuals to struggle with maintaining a gluten-free diet due to various challenges such as economics, avail- ability, and lack of motivation. To demonstrate the importance of adhering to a gluten-free diet, I have developed a mathematical model that can predict the damage to the body from eating gluten for those with celiac disease.

    This thesis presents the development of a mathematical model through systems biology to simulate the changes of antibody levels and villi damage in individu- als with celiac disease. The model provides insights into the immune response triggered by gluten ingestion and the subsequent impact on the small intestine’s villi. By testing different hypothesis on what affects the immune response a model have been developed that can predict, with some limitations, how antibody levels fluctuate when switching between gluten-containing and gluten-free diets. The model has been validated with available data.

    The developed model is described with ordinary differential equations. It is based on the assumption that all individuals with celiac disease have a basal antibody level, even when following a gluten-free diet. The model also accounts for vary- ing sensitivity to gluten among individuals, resulting in different amounts of an- tibody production and a different decrease rate.

    The results highlight the critical importance of maintaining a strict gluten-free diet for those with celiac disease, regardless of symptom presence. This work un- derscores the potential of systems biology to enhance our understanding of celiac disease, offering a foundation for further research. It is also a basis for being able to motivate those with celiac disease to maintain a gluten-free diet. Future ef- forts should focus on obtaining more extensive datasets to refine the model and explore additional parameters influencing the immune response.

    Download full text (pdf)
    fulltext
  • Holmgren, Alma
    Linköping University, Department of Biomedical Engineering.
    Mathematical Modelling of Microcirculatory Perfusion and the Impact of Blood Pressure Medications2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Hypertension, or high blood pressure, is a prevalent condition that significantly contributes to early mortality worldwide. The World Health Organization (WHO) estimates that 1.28 billion adults aged 30-79 years have hypertension, yet only half are aware of their condition. Hypertension, often asymptomatic, is diagnosed through blood pressure measurements in the larger arteries of the arm, with readings above 140/90 mmHg considered high. If untreated, hypertension can lead to serious health issues such as heart failure, stroke, myocardial infarction, and kidney disease. Commonly prescribed medications for hypertension include angiotensin-converting enzyme (ACE) inhibitors, angiotensin-2 receptor blockers (ARBs), and hydrochlorothiazide (HTZ).

    This study delves into the mathematical modeling of microcirculatory perfusion and the impact of these blood pressure medications. The aim is to deepen the understanding of microcirculation and how it is influenced by hypertension treatments. The study employs a mathematical model that integrates vascular resistance and compliance across different vessel types, including arterioles, capillaries, and venules, as well as the larger arteries and veins. Two iterations of the perfusion model were developed. The initial version provided a basic understanding but failed to accurately capture the perfusion overshoot observed post-occlusion in the experimental data. An improved second version incorporated additional parameters representing the larger arteries, leading to a more accurate simulation of microcirculatory perfusion.

    The findings indicate that blood pressure medications influence microcirculatory perfusion by modifying vascular resistance and compliance, particularly in the arterioles and capillaries. However, due to limited amount of data, general conclusions about the impact of the medications cannot be definitively drawn. In conclusion, while the developed model offers valuable insights into microcirculatory dynamics and the effects of hypertension treatments, further refinement and validation with more extensive datasets are necessary. These improvements will enhance the model's reliability and utility, potentially informing better diagnostic and therapeutic approaches for managing hypertension.

    Download full text (pdf)
    fulltext
  • Ohlsson Orell, Julia
    Linköping University, Department of Biomedical Engineering.
    Evaluation of Cross-vendor Retinal Layer Optical Coherence Tomography Segmentation2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this thesis, different ways of segmenting retinal layers in OCT images are investigated. This is done through experiments, where a U-net, a lightweight fully convolutional network and two approaches based on the Canny edge detector are implemented and evaluated using Dice score, precision, recall, and Hausdorff distance.

    Bioptigen, Heidelberg, and Zeiss are examined as vendors and their metrics are compared separately in addition to the metrics for all data. Additionally, the performance was evaluated separately with images without denoising, images denoised using Gaussian smoothing, and non-local means respectively. The convergence time for the neural networks is also examined. 

    The results show that the neural network approaches perform well on all vendors and denoising approaches, while the Canny edge detectors achieve comparatively worse results, showing less suitability to solving the segmentation problem. The U-net architecture achieved the best performance with regards to the Dice score, precision, and recall with a mean scores of approximately of 0.99. On the other hand, the lightweight FCN achieved the best values for Hausdorff distance, with a mean Hausdorff distance of 4.943 when using Gaussian smoothing. 

    Among the vendors, the approaches performed best on the Zeiss data, then the Bioptigen data, and lastly the Heidelberg data. The reason for this could be that the Zeiss images that were used contained less noise due to them being preprocessed, and the Heidelberg data sets contained most of the difficult cases with for example DME. Out of the three denoising approaches, Gaussian smoothing achieved the best results but non-local means resulted in the fastest convergence time for the neural networks. 

    Download full text (pdf)
    fulltext
  • Wallhagen, Jacob
    et al.
    Linköping University, Department of Thematic Studies, Technology and Social Change.
    Rebeggiani, Marcello
    Linköping University, Department of Thematic Studies, Technology and Social Change.
    Riverfrontutveckling: Erfarenheter från svenska städer2024Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis aims to study urban renewal projects in medium-sized Swedish municipalities next to flowing waterways by studying the projects: Inre hamn in Karlstad, Inre hamnen in Norrköping and Norrtälje hamn in Norrtälje. The driving questions have been: "how have the selected municipalities chosen to work with the riverfront in the investigated projects?", and "How can the design of the riverfront projects in the selected municipalities be understood based on conditions and choices during the planning process?". The essay is based on a qualitative analysis of interviews that were conducted with municipal planners who have been involved in the selected projects. The results are analyzed using the theoretical frameworks governance and modes of governance. The study shows how different conditions and different municipal strategies resulted in different ways of organizing the planning process, reasonably similar to the governance modes of hierarchy, network and market in the modes of governance framework. The management methods seem to have mainly influenced the design of the buildings, while the public spaces were designed in a similar way in all projects.

    Download full text (pdf)
    fulltext
  • Parcina, Nada
    Linköping University, Department of Thematic Studies, The Department of Gender Studies.
    Not a woman enough: An analysis of the representation of female athletes with different sexual development in the IOC policies2024Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper will analyze how the "issue" of elite athletes with DSD was problematized by the IOC in their three official policies. More specifically, I will present three distinct discourses that were formed by the IOC from the first ever published document in 2012 until today. First policy, published in 2012, develops genetic determinism discourse, leaving no space for female athletes with DSD to become eligible for competition. In 2015, the IOC published a second policy based on a medical discourse, in which DSD has been articulated as a "problem" that can be solved by athletes themselves, if they decide to reduce their testosterone to "normal" levels. Finally, the 2021 policy departs from the medical discourse towards the human rights discourse in which focus is placed on anti-discrimination and inclusion. Each of these discourses corresponds to particular problem representation. The evolution of the IOC's discourses on athletes with DSD allows a better understanding of how women are treated in a sports arena that has been traditionally related to the ideals of masculinity. It is a part of a much broader academic debate that discusses women's abilities and challenges perpetuated beliefs about sex and gender.   

    Download full text (pdf)
    fulltext
  • Pantzar, Martin
    Linköping University, Department of Thematic Studies, Technology and Social Change.
    Klimatanpassning i den täta staden: En fallstudie av Göteborg2024Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The strategic planning today tends to be in accordance with the ideal of compact city which is considered representing sustainable development of cities. This study has analyzed the challenges with the development of the compact city in relation to climate adaptation of the urban milieu. Both managing and preventive measures has been identified and other conflict concerning this. Climate adaption of the urban milieu using green space can come in to conflict with other important interest of society like housing shortage. The study has further shown that ownership has significance in implementing tools for climate adaption in Gothenburg and that it often requires innovative solutions to be able to integrate these tools in a compact city. 

    Download full text (pdf)
    fulltext
  • Könnecke, Jessica
    Linköping University, Department of Thematic Studies, The Department of Gender Studies.
    On Being Entrepreneurial: Exploring the Potential of Intersectionality in Business Incubation2024Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In my thesis, I examine the possibility of applying intersectionality to business incubation. Sharing my personal experiences as a white, hetero, middle-class, cis woman in the entrepreneurial world and highlighting the privileges I had, I criticize the ideal of "the female entrepreneur" that is often shaped by white feminism, which only caters to the needs of already privileged women. I argue that entrepreneurship has been considered a purely meritocratic activity, but it depends on a person’s personal background and their social positionality. Thus, a founder's success is influenced by factors such as gender, age, socio-economic background, dis/ability, or ethnicity. Using entrepreneurial ecosystems as contextual basis, I explore how intersectionality can be used to making business incubation more inclusive. For my case study research design, I employ semi-structured interviews, written documents, and analytic memos as my selected methods. Ultimately, I have developed an intersectional business incubation model that is designed to offer practical and theoretical insights to practitioners, policymakers, and scholars.

    Download full text (pdf)
    fulltext
  • Axelsson, Emilia
    et al.
    Linköping University, Department of Computer and Information Science.
    Wirén, Gustav
    Linköping University, Department of Computer and Information Science.
    Schelin, Karl
    Linköping University, Department of Computer and Information Science.
    Cederkvist Hansen, Sophia
    Linköping University, Department of Computer and Information Science.
    Meyer, Patrik
    Linköping University, Department of Computer and Information Science.
    Hansson, Tim
    Linköping University, Department of Computer and Information Science.
    Jozic, Leo
    Linköping University, Department of Computer and Information Science.
    Empowering Electric Mobility: A Platform for Connecting Charging Station Owners and Electric Vehicle Users2024Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study investigates how navigability and trustworthy design impacts a consumer’swillingness to use a website used for renting private charging stations for electrical vehicles. To gather data a website was designed according to what literature on navigabilityand trustworthy design suggested. To verify how well the website was implemented usertests were conducted to gather qualitative assessments. It was concluded that navigabilityand trust are crucial for enhancing user experience and increasing the likelihood of purchase on e-commerce websites.Key factors in establishing trust include a high-quality, professional appearance, transparency, accessible company information, stable pricing, and secure payment options.These elements were found to significantly boost users’ confidence in the website, therebyincreasing their willingness to use the website.In terms of navigability, the study identified that an organized layout with intuitivebutton placements, clear links, breadcrumb trails, and easy access to the home page significantly improved navigability. Specifically, for a rental website, a clear and easily accessiblemap of available charging spots greatly enhanced user satisfaction regarding navigability.The primary goal of this study was to provide further insights into important factors inwebsite development when it comes to creating trust and navigability. The study successfully identified these critical factors, achieving its aim. The development project resulted ina satisfactory website, although further enhancements, particularly in navigability alerts,customer reviews, and privacy policies, were noted as potential improvements.Additionally, further research on adapting the product to its target audience whilemaintaining profitability was supported by a comprehensive marketing plan based onan extensive marketing survey

    Download full text (pdf)
    fulltext
  • Lome, Ragnild
    Linköping University, Department of Culture and Society, Division of Language, Culture and Interaction. Linköping University, Faculty of Arts and Sciences.
    Friedrich Kittler: Operation Valhalla: Writings on War, Weapons, and Media2023In: Norsk litteraturvitenskapelig tidsskrift, ISSN 0809-2044, E-ISSN 1504-288X, Vol. 26, p. 68-72Article, book review (Other academic)
    Download full text (pdf)
    fulltekst
  • Ahokas, Jakob
    Linköping University, Department of Electrical Engineering.
    Automated animal behavior analysis using accelerometer activity tags2024Independent thesis Advanced level (degree of Master (Two Years)), 28 HE creditsStudent thesis
    Abstract [en]

    The agricultural sector relies heavily on livestock, and efficient management of the animals is crucial not only for economic reasons but also for ensuring animal welfare and promoting sustainable farming practices. Traditional livestock management methods such as manual supervision and remote cameras are labor-intensive and costly, particularly with large or free-roaming herds. 

    This thesis explores the integration of collar-based accelerometer activity tags with the use of machine learning models to automate the monitoring and analysis of livestock behavior, specifically focusing on cows and goats. The primary goal is to develop a system that can accurately classify various animal behaviors using data collected from 3-dimensional accelerometer sensors. 

    The methodology involves collecting accelerometer data from tagged animals, which are processed and transformed into various representations for feature extraction. A decision tree classifier, simplified from an original random forest model, is trained on this feature set to recognize different behaviors. 

    The model implementation on the system-on-chip demonstrates the feasibility of deploying these machine models on resource-constrained embedded systems. The classifier developed in this study performs well across most basic behaviors, demonstrating high accuracy in detecting activities such as eating, lying, and standing. However, some underrepresented classes in the dataset showed lower classification performance. To address this, the study uses data augmentation techniques to balance the impact of underrepresented classes and improve the model’s generalization across less frequent behaviors. The results show promise as a way to modernize agriculture by offering an automated solution for livestock monitoring, with significant implications for animal health, farm efficiency, and overall welfare. 

    Download full text (pdf)
    fulltext
  • Norlinder, Anton
    et al.
    Linköping University, Department of Electrical Engineering.
    Fredriksson, Anton
    Linköping University, Department of Electrical Engineering.
    Analys av lagerströmmar i industriella maskiner: En fallstudie på en modern kartongmaskin2024Independent thesis Basic level (university diploma), 14 HE creditsStudent thesis
    Abstract [en]

    This work investigates and analyzes the occurrence of bearing currents in industrial electric machines, focusing on a cardboard production facility. Bearing currents are undesired currents that pass through the bearings and can negatively affect the machine's lifespan and performance. The purpose of this work is to understand the origins of bearing currents and to discuss effective measures for detecting and managing them.

    By detecting discharges from the machines' rotating shafts, the affected machines with harmful bearing currents were identified. Due to limitations such as inaccessibility, space constraints, and safety risks, measurements could not be conducted on all machines in the facility. Despite some uncertainty in the measurement results, the method used is considered sufficiently reliable to provide indications of the presence of harmful bearing currents.

    Download full text (pdf)
    fulltext
  • Svens, Hampus
    et al.
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Lukas, Hellberg
    Linköping University, Department of Electrical Engineering, Computer Vision.
    Finding Balance in Neural Architecture Search: Towards Optimal and Resource-Efficient Task Branching in Multi-Task Networks2024Independent thesis Advanced level (degree of Master (Two Years)), 28 HE creditsStudent thesis
    Abstract [en]

    Similar to how we humans use prior knowledge from one skill when learning new ones, multi-task networks can leverage similarities between different tasks to enhance learning speed. By acknowledging and leveraging common features across tasks, multi-task networks can be more efficient when learning and are able to generalize better. However, due to the technological advancements in deep learning, the modern architecture of such networks can be highly complex and vary significantly, so finding an optimal architecture is far from trivial. To handle this problem, we have utilized different methods to limit the search space and find the suitable architectural designs given a varying number of tasks. Through a comprehensive analysis of neural network structures and loss weighting strategies, the thesis contributes valuable insights into achieving a suitable trade-off between resource usage and task performance, paving the way for more effective and resource-conscious multi-task network designs.

    Download full text (pdf)
    fulltext
  • Dalpiaz, Christoph
    Linköping University, Department of Electrical Engineering, Computer Engineering.
    Design of Low-Complexity FIR Filters using Cascade Structures2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Finite Impulse Response (FIR) filters are commonly used for the implementation of digital filters, for example because a linear phase response can be easily obtained. In order to reduce the hardware complexity of the resulting digital circuit, cascade form realizations for FIR filters have been studied in many publications. 

    In this Master thesis, the design of FIR filters in cascade form, where the cascade consists of simple low-complexity FIR filter sections chosen from a candidate section set, and a remaining general FIR filter implemented using a transposed direct form linear-phase structure, is studied.

    The candidate section set is determined by considering different adder graph topologies with different placements of delay elements and multiplications by signed power of two (SPT) terms. Using this candidate section set, the cascade form FIR filters are designed by performing a factorization and redesign of the general FIR filter, which is performed in an iterative manner.

    Scaling and ordering of the subfilters is performed using methods from previous literature.

    The presented design method is applied to example filter specifications and the resulting adder count is compared with optimal designs from previous literature. According to the results, the presented design method can lead to a reduced adder count, especially if the specified stopband is wide and many unit-circle zeros are present.

    Download full text (pdf)
    fulltext
  • Sjöberg, Fredrica
    Linköping University, Department of Computer and Information Science.
    Förbättrad tillgänglighet - En utvärdering av en myndighetssida av dess tillgänglighet och användbarhet för personer med synnedsättning2024Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Med dagens digitala utveckling blir det allt viktigare att digitalt material finns tillgängligt för alla. För att främja deltagande och inkludering är digital tillgänglighet en grundläggande förutsättning, särskilt för personer med begränsad funktionsförmåga. År 2020 infördes lagkrav på myndighetssidor för att säkerställa tillgänglighet och i sin tur inkludering. Denna studie syftade på att undersöka hur användbar och tillgänglig Folkhälsomyndighetens webbplats var utifrån personer med synnedsättningar samt hur nya och förbättrade designförslag kan tas fram. Utifrån användartest med fem deltagare inom målgruppen med tillhörande eftertestfrågor samt System Usability Scale var deltagarnas upplevelse av webbplatsen varierande. Majoriteten deltagare ansåg att webbplatsen var ostrukturerad, svår att hitta information på samt att webbplatsens sökfunktion inte uppfyllde deras förväntningar. En heuristisk utvärdering utifrån tillgänglighetsprinciper resulterade i ett flertal identifierade problemområden gällande bland annat inkonsekvent återkoppling. Med hjälp av den kvalitativa och kvantitativa datan i samband med designprinciper togs fyra nya designförslag och förslag inom tillgänglighet fram i skriftlig form som skulle kunna öka tillgängligheten på Folkhälsomyndighetens webbplats. Studien resulterade i identifieringar av problem, både från deltagarnas personliga åsikter och den heuristiska utvärderingen. Trots de lagkrav som Folkhälsomyndigheten har på sig finns det utrymme för förbättringar som bör åtgärdas för att alla ska ha tillgång och känna delaktighet. 

    Download full text (pdf)
    fulltext
  • Faleij, Rebecca
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Arts and Sciences.
    Användningen av Ljud för Gaffeltruckar i Industriell Miljö: En Etnografisk Studie2024Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The creation of a safe workplace is an important topic for many industrial com- panies. Part of this process is managing the levels of noise produced by various machines present at industrial worksites, among which forklifts are common. These machines pose a considerable safety concern, not only due to their size and weight, but also because they produce a substantial amount of noise. In previous studies the focus has primarily been on reduction of sound as auditory overstimulation has proven to cause hearing difficulties and mental distress in individuals who work in noisy environments. In the current study the aim has been to identify solutions for optimization of forklift auditory output in an attempt to minimize any unnecessary noise while maintaining the flow of information. Two ethnographic observations and an interview with an operator were performed in order to gather data for the analysis. The method utilized for the analysis was grounded theory. During this process a few themes could be identified, two of which were utilized to compose a model that was used to evaluate the need for sounds in different scenarios. The model aims to strike a balance between the frequency with which these scenarios occur while driving a forklift and the amount of auditory control given to the driver in each situation. The study concludes that high frequency situations call for more auditory control from the operator and low frequency situations for less control. For some of the examined scenarios this balance could not be achieved with the current system. Possible solutions were proposed and mainly pertained to an increase in auditory control for the operators.

    Download full text (pdf)
    fulltext
  • Holtz, Johan
    et al.
    Linköping University, Department of Computer and Information Science.
    Nikku, Aron
    Linköping University, Department of Computer and Information Science.
    Implementation and Evaluation of the DDCA Standard2024Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    This study aims to evaluate the usability and applicability of the Distributed Debrief Control Architecture(DDCA) standard, SISO-STD-015-2016, by implementing it for a number of different transport protocolsand situations. Conducted in collaboration with Pitch Technologies, the project involves creating testapplications that use the DDCA standard to facilitate synchronized playback of recorded data fromdistributed simulations, for the purpose of conducting after action review. We focus on assessing if thestandard alone is sufficient for developing independent, interchangeable DDCA applications, identifyingpotential improvements to developer usability, and determining the compatibility of the standard withvarious transport protocols. Through practical implementation and testing, we have identified severalshortcomings and ambiguities in the standard. We propose amendments and evaluate the usability ofthe DDCA standard in real-world scenarios. With this we hope to further development and refinementof the standard.

    Download full text (pdf)
    fulltext
  • Brofors, Olivia
    et al.
    Linköping University, Department of Computer and Information Science.
    Gripne, Ella
    Linköping University, Department of Computer and Information Science.
    Andersson, Erik
    Linköping University, Department of Computer and Information Science.
    Strid, Axel
    Linköping University, Department of Computer and Information Science.
    Lundqvist, Erik
    Linköping University, Department of Computer and Information Science.
    Redfors, Adrian
    Linköping University, Department of Computer and Information Science.
    Ingvald, Fredrik
    LiU Marketplace - A Digital Marketplace For Students, By Students2024Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The online platform formed designed, implemented and developed in this thesis, LiU Marketplace,is a digital marketplace designed to address current concerns regarding security and trust in existing online marketplace options for Linköping University (LiU) students.This thesis identifies design principles, technical features, and navigability aspects thatbuild trust and user engagement through existing literature. The web application produced integrates LiU’s Single Sign-On system for user verification, creating a closed marketplace. User-centric design, responsive techniques, and efficient loading times caters to the user experience,while intuitive search functionality, category filters, and a user-friendly interfaceenable smooth navigation and transactions. User testing validates the platform’s effectiveness,with participants finding it user-friendly and intuitive. LiU Marketplace presents anovel approach to creating a secure, student-centric platform, demonstrating the importance of leveraging existing IT infrastructure, understanding the target audience, and subsequently tailoring the user experience. The findings contribute to online marketplace research,offering a potential pathway to boost peer-to-peer transactions within university communities by creating walled online marketplace environments.

    Download full text (pdf)
    fulltext
  • Solin, Daniel
    et al.
    Linköping University, Department of Computer and Information Science.
    Karlsson, Adam
    Linköping University, Department of Computer and Information Science.
    Exploring prompting techniques: An evaluation of prompting techniques for identifying blueprints2024Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Large language models have gained widespread use and made its way into numerous parts of everyday life. Paramount interest is therefore on how to use these models correctly and increase their efficiency. This has led research to the field of prompt engineering, which shows a huge difference in accuracy depending on how the user writes their prompt. This paper investigates three techniques from the field of prompt engineering; zero-shot, few-shot and chain-of-thought prompting to classify construction blueprints on the multi-modal large language model chatGPT-4. The results show that few-shot and chain-of-thought prompting perform similarly and zero-shot substantially worse.

    Download full text (pdf)
    Exploring prompting techniques
  • Björk, Hugo
    et al.
    Linköping University, Department of Computer and Information Science.
    Andersson, Axel
    Linköping University, Department of Computer and Information Science.
    Strategies for Accurate Context Retrieval in Retrieval-Augmented Generation Systems Across Diverse Datasets2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In recent years, the rapid advancement of generative artificial intelligence has significantly expanded the horizons of knowledge management and information retrieval. With the increasing reliance on large language models across various domains, the efficiency of context retrieval for RAG systems has become a key part of leveraging these technologies. This thesis specifically addresses the optimization of context retrieval in RAG systems, concentrating on datasets with distinct linguistic attributes such as written and spoken language. The study’s findings indicate that organizing the knowledge base according to the nature of the language (written vs. spoken) of documents enhances retrieval accuracy. Furthermore, fine-tuning source-specific embedding models proves effective in bridging performance gaps among data sources. Additionally, the research unveils promising synergies between generating alternative queries and re-ranking retrieved context using large language models, innovations primarily explored in isolation in prior literature.

    Download full text (pdf)
    fulltext
  • Public defence: 2024-09-06 13:15 K1, Keybuilding, LinköpingOrder onlineBuy this publication >>
    Lome, Ragnild
    Linköping University, Department of Culture and Society, Division of Language, Culture and Interaction. Linköping University, Faculty of Arts and Sciences.
    Agency on the Page: Melodrama and Ecodrama in 1960s Scandinavian Fiction2024Doctoral thesis, monograph (Other academic)
    Abstract [en]

    A multitude of ideas about individual and distributed agency circulated in Scandinavian culture during the 1960s, a period often designated as the early information age. Through an analysis of six novels, this dissertation discusses how prose fiction in and around the 1960s in Norway, Sweden and Denmark responded and contributed to this circulation of ideas of agency. The study argues that a transition is played out in the novels, from an idea of agency as individualistic and possessive, which I designate as melodramatic, towards an idea of agency as distributed and ecodramatic, emerging in an active environment, where multiple agents, human and non-human, co-exist (these concepts are derived and developed from works by Timothy Melley and Mark Seltzer). This transition is claimed to be conveyed through vague feelings expressed by the characters, signalling problems with the representation of agency, which are discussed in the thesis through the concept of affects (as understood by Sianne Ngai, primarily). The study overall applies a media ecological perspective to the literary works, situating questions of both literary form and ideas of agency in the techno-cultural development of the 1960s, investigated through the lens of the cultural history of cybernetics and understood as part of a larger epistemological and ontological change – a process of ecologization (Erich Hörl). This process accelerated during the period and is characterized in this study by a focus on relations, networks and self-reflexivity. From this theoretic approach, ideas of agency must be understood as intrinsically entangled with changes in the environment (environment understood in a broad sense as a setting in the novels, including both technologically mediated environments and natural environments), and this is conceptualized through the newly coined term agotope, an adjusted version of Mikhail Bakhtin’s concept of the chronotope. Three agotopes organize the readings in the study, each referring to key aspects of 1960s culture: “Traffic,” “Contamination” and “Media.” The six novels studied are Bilburen (Carborne, 1963) and Miniput (Miniput, 1969) by Swedish writer Nils Leijer, Den siste prøven (The Final Test, 1968) and Sommeren på heden (Summer on the Heath, 1970) by Norwegian writer Vigdis Stokkelien, Pap (Cardboard, 1967) by Danish writer Cecil Bødker, and Termush, Atlanterhavskysten (Termush, the Atlantic Coast, 1967) by Danish writer Sven Holm. 

    Download full text (pdf)
    fulltext
    Download (png)
    presentationsbild
  • Stål, Gustav
    et al.
    Linköping University, Department of Computer and Information Science.
    Tegnell, Fredrik
    Linköping University, Department of Computer and Information Science.
    Expectations, possibilities, and risks for an aggregator of distributed energy resources in the Swedish electricity grid of the future2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Distributed energy resources, such as wind farms, solar panels, and battery storage, play an increasingly important role in the electricity grid and tackling challenges related to flexibility and capacity control. Aggregators offer control and services for end customer distributed energy resources, allowing for consolidation of multiple smaller resources into larger operational groups that can collectively participate in energy and balancing markets, increasing profitability and resource adaptability.

    This thesis aims to investigate the impact of distributed energy resource from an aggregators context, in order to gain insights into potential challenges, risks and opportunities of the energy grid of the future. In collaboration with an aggregator, a dynamic optimization system creating schedules based off of current energy and balancing market prices was developed to enable smart and automatic allocation of resources in their portfolio. This system was designed to explore the utilization and impact of distributed energy resources effectively. Concurrently, a series of interviews were conducted with five stakeholders involved in the electrical grid to capture their perspectives on the integration of distributed energy resources in the grid.

    The analysis of the dynamic optimization system and stakeholder interviews revealed that engaging distributed energy resources across multiple markets will be crucial, and that this simultaneously not only enhances profitability and risk diversification but also increases the controlled capacity provided to the grid. Stakeholders anticipate plug-and-play systems that can autonomously manage their resources and boost revenues. However, existing hardware limitations pose significant integration challenges. Additionally, IT security concerns, along with regional and local-level challenges, are substantial barriers that need to be addressed to enable broader adoption of distributed energy resources and enhance grid flexibility. Furthermore, it is essential for governing bodies to provide economic incentives for sustainability, as stakeholders predominantly view monetary gain as a primary motivator for investments.

    Potential future work could explore the integration of additional services in the Swedish market into the system, investigating how local and regional limitations could be handled by the system, and the improvement of forecasting techniques to better predict market conditions and optimize resource allocation.

    Download full text (pdf)
    fulltext
  • Berggren, Erik (Editor)
    Linköping University, Department of Culture and Society, Division of Migration, Ethnicity and Society (REMESO). Linköping University, Faculty of Arts and Sciences.
    Migration and Culture2024Report (Other academic)
    Abstract [en]

    This report is written by students in the Ethnic and Migration Studies Master’s Programme, part of the Research Institute in Migration, Ethnicity, and Society (REMESO) at Linköping University, based on the Norrköping campus. REMESO is an internationally renowned institute that pursues research in migration and ethnic relations. The Master’s Programme is highly sought after, with students coming from all over the world to attend. Their interest in how migration transforms the world and how it influences other social phenomena has fuelled their work in this publication.

    In their first year of studies, students take the course Critical Cases in Ethnic and Migration Studies, led by Erik Berggren as course coordinator and Kenna Sim-Sarka. The course is designed for students to apply the theoretical knowledge and experiences gained throughout the first year’s courses to produce articles beyond an academic audience for the broader public. Each REMS report is based around a specific theme, with previous themes including migration and Covid-19, migration and Ukraine, and migration and democracy. The REMS report is one of the many ways in which we, as students, are trained to identify and analyse issues related to migration, integration, and diversity and to make research accessible to a wider audience.

    This year’s overarching theme is Migration and Culture, sparked by recent developments in Sweden’s and Norrköping’s politics of decreasing and cutting funds for cultural activities. Arts and culture are both areas of expression for migrant communities and people on the move, as well as those fighting against racism, discrimination, and exclusion. The current debate on “Swedish culture” and on a “Swedish cultural canon” recalls monolithic understandings of culture as a natural and immutable construct, contributing to the polarisation of views rather than the multiplication of perspectives and conceptions of it.

    Like culture, which can be visualised as a tapestry created from different threads, different contributions, woven together to form something complex, this report is also a collection of varied articles, united by a common theme. Some articles in this report look at the accessibility of culture in Sweden and its transmission through all kinds of mediums, such as TV programmes; others engage artists or “social artists” who care about issues like migration and the fight against racism and discrimination, and some focus on specific aspects of culture and arts, such as language, food, and music.

    The first-year students of EMS, 2024.

    Download full text (pdf)
    fulltext
    Download (png)
    presentationsbild
  • Fernando, Caroline
    et al.
    Linköping University, Department of Computer and Information Science.
    Bengtsson, Rickard
    Linköping University, Department of Computer and Information Science.
    Algorithms for Detecting Sewage Contamination in Drinking Water Distribution Systems: Comparing Conventional Algorithms and a Machine Learning Approach2024Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    In this project, algorithms for digital monitoring of drinking water quality in distribution networks were developed and evaluated. Through automatic surveillance using a sensor, like The Electronic Tongue used in this study, it is possible to detect deviations in water quality such as sewage contamination before the water is consumed by the end user, causing people to fall ill. Manual monitoring of drinking water quality is relatively costly and slow. Automatic surveillance would then act as a nice complement for detecting and preventing contaminated drinking water from reaching consumers. To further investigate how a low detection limit for sewage contamination can be achieved with minimal false alarms in a real-time response system, three different algorithms were developed. One conventional algorithm, and two others using machine learning techniques. These algorithms were then compared to one another in terms of accuracy, delay of response, and accuracy of concentration estimates. The conventional algorithm could detect 0.02 % sewage without raising any false alarms during the control test period whilst one of the algorithms using machine learning showed potential for detecting concentrations as low as 0.005 %, however not without also causing some false alarms during normal variations. The conventional algorithm produced the most accurate sewage concentration estimates out of the three algorithms. The results indicate that the conventional algorithm could prove a useful complement to detecting sewage contamination in a drinking water distribution network. They also show promise for the machine learning algorithms given more data and further development.

    Download full text (pdf)
    fulltext
  • Public defence: 2024-09-06 09:00 K3, Önnesjösalen, NorrköpingOrder onlineBuy this publication >>
    af Geijerstam, Peder
    Linköping University, Department of Health, Medicine and Caring Sciences, Division of Prevention, Rehabilitation and Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Primary Care Center, Primary Health Care Center Cityhälsan Centrum.
    Home Blood Pressure in Health and Disease2024Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Hypertension is the most common preventable cause of premature all-cause mortality, primarily from cardiovascular disease (CVD). Individuals with dysglycemia, including prediabetes and diabetes, are at increased risk. Licorice intake raises blood pressure (BP) through the effects of glycyrrhizic acid (GA), but the true limit of safe intake is uncertain. Home BP has several benefits over BP measured at a clinic, including a higher predictive value for CVD. By combining office and home BP, it is possible to diagnose masked hypertension (MH), in which home but not office BP is elevated, and white coat hypertension (WCH), in which office but not home BP is elevated. The aim of this thesis was to advance our knowledge on home BP in relation to dysglycemia, markers of CVD, and licorice intake.  

    The first 3 papers used data from the Linköping cohort of the prospective Swedish CArdioPulmonary bioImage Study (SCAPIS). Study IV was a randomized controlled cross-over study. Data was obtained from questionnaires, blood samples and office and home BP measurements. In studies I-III, pulse wave velocity (PWV), coronary artery calcium score (CACS), and carotid artery plaques as markers of CVD were also included.  

    In Study I, we examined 5025 men and women aged 50-64 years old for the relation between dysglycemia and home BP. Both the systolic office and home BP measurements were positively as-sociated with dysglycemia. Participants with dysglycemia vs normoglycemia more often had MH. The findings were in line with previous research and strengthened the association between dysglycemia and MH.  

    In Study II, we examined the associations between MH and markers of CVD in 4122 individuals without BP-lowering treatment. Of participants, 4.2% had MH, and these were more often men and had higher BMI than those with normotension. Participants with MH also had higher odds for CACS ≥100, an as-sociation which has previously been suggested as a trend.

    In Study III, we examined the relation between soluble P-se-lectin (sP-selectin) as a measure of thrombotic activity, plasma high-sensitivity C-reactive protein (hsCRP) as a measure of inflammation, and home BP in 4548 participants. Both markers were higher in each hypertension phenotype compared with sustained normotension. The quartile of participants with the highest sP-se-lectin values had higher odds for CACS ≥100 and carotid artery plaques. The association between sP-selectin and sustained hyper-tension was novel and not affected by adjustments for hsCRP.  

    In Study IV, 28 healthy participants aged 18-30 years old were evaluated for the effects of a daily intake of licorice containing 100 mg of GA compared with a control product for 2 weeks. During the licorice intake period, the systolic home BP increased with 3.1 mmHg, and the suppression of serum aldosterone and plasma renin levels indicated that this was due to the licorice intake.  

    In conclusion, this thesis further strengthens the idea that both home and office BP measurements have values beyond that of the other, and that home BP may be most valuable in individuals with dysglycemia and obesity, and in men. Finally, licorice may be more potent than previously known, suggesting the need for increased awareness. 

    List of papers
    1. Home Blood Pressure Compared With Office Blood Pressure in Relation to Dysglycemia
    Open this publication in new window or tab >>Home Blood Pressure Compared With Office Blood Pressure in Relation to Dysglycemia
    Show others...
    2022 (English)In: American Journal of Hypertension, ISSN 0895-7061, E-ISSN 1941-7225, Vol. 35, no 9, p. 810-819Article in journal (Refereed) Published
    Abstract [en]

    Background: Masked hypertension is more common in individuals with type 2 diabetes than in individuals with normoglycemia. We aimed to explore if there is a discrepancy between office blood pressure (office BP) and home blood pressure monitoring (HBPM) in relation to HbA1c as well as glycemic status in 5,029 middle-aged individuals.

    Methods: HBPM was measured in a subsample of 5,029 participants in The Swedish CardioPulmonary BioImage Study (SCAPIS), a population-based cohort of 50–64 years old participants. Both office BP and HBPM were obtained after 5 minutes’ rest using the semiautomatic Omron M10-IT oscillometric device. White coat effect was calculated by subtracting systolic HBPM from systolic office BP. Participants were classified according to glycemic status: Normoglycemia, prediabetes, or diabetes based on fasting glucose, HbA1c value, and self-reported diabetes diagnosis.

    Results: Of the included 5,025 participants, 947 (18.8%) had sustained hypertension, 907 (18.0%) reported taking antihypertensive treatment, and 370 (7.4%) had diabetes mellitus. Both systolic office BP and HBPM increased according to worsened glycemic status (P for trend 0.002 and 0.002, respectively). Masked hypertension was more prevalent in participants with dysglycemia compared with normoglycemia (P = 0.036). The systolic white coat effect was reversely associated with HbA1c (P = 0.012).

    Conclusions: The systolic white coat effect was reversely associated with HbA1c, and the prevalence of masked hypertension increased with dysglycemia.

    Place, publisher, year, edition, pages
    Oxford, United Kingdom: Oxford University Press, 2022
    Keywords
    blood pressure, cardiovascular disease, diabetes, dysglycemia, HbA1c, home blood pressure monitoring, hypertension, white coat effect
    National Category
    General Practice Endocrinology and Diabetes
    Identifiers
    urn:nbn:se:liu:diva-187063 (URN)10.1093/ajh/hpac082 (DOI)000826969200001 ()35849046 (PubMedID)
    Note

    Funding: The main funding body of The Swedish CArdioPulmonary bioImage Study(SCAPIS) is the Swedish Heart and Lung Foundation [2016-0315]. The study is also funded by the Knut and Alice Wallenberg Foundation [2014-0047], the Swedish Research Council [822-2013-2000], VINNOVA (Sweden’s Innovation agency) [2012-04476], the University of Gothenburg and Sahlgrenska University Hospital, Karolinska Institutet and Stockholm county council, Linköping University and University Hospital, Lund University and Skåne University Hospital, Umeå University and University Hospital, Uppsala University and University Hospital, the Swedish state under the agreement between the Swedish government and the county councils (the ALF-agreement), and the King Gustaf V and Queen Victoria’s Foundation of Freemasons.

    Available from: 2022-07-20 Created: 2022-07-20 Last updated: 2024-07-08Bibliographically approved
    2. Masked hypertension in a middle-aged population and its relation to manifestations of vascular disease
    Open this publication in new window or tab >>Masked hypertension in a middle-aged population and its relation to manifestations of vascular disease
    Show others...
    2023 (English)In: Journal of Hypertension, ISSN 0263-6352, E-ISSN 1473-5598, Vol. 41, no 7, p. 1084-1091Article in journal (Refereed) Published
    Abstract [en]

    Background: Masked hypertension is associated with cardiovascular disease (CVD). However, previous large studies have not used the same device to measure office and home blood pressure (BP) and adhered to current home BP measurement recommendations of the European Society of Hypertension. We aimed to characterize masked hypertension and explore its relation to manifestations of CVD.

    Methods: A randomly selected cohort of 5057 participants aged 50–64 years from the Swedish CardioPulmonary BioImage Study (SCAPIS) was evaluated with office and home BP using the semi-automatic Omron M10-IT oscillometric device. Additional analyses included pulse wave velocity (PWV) and coronary artery calcium score (CACS).

    Results: Of participants, 4122 did not have current antihypertensive treatment, and were thus included in our analyses. Of these, 2634 (63.9%) had sustained normotension, and 172 (4.2%) had masked hypertension. Participants with masked hypertension vs. sustained normotension were more often men (66.9 vs. 46.2%, P < 0.001). Those with masked hypertension had higher mean PWV [9.3 (95% confidence interval, 95% CI 9.1–9.5) vs. 8.3 (95% CI 8.2–8.4) m/s, P < 0.001] and odds ratio for CACS at least 100 [1.65 (95% CI 1.02–2.68), P = 0.040]. These associations were similar in a posthoc analysis of masked hypertension and sustained normotension, matched for age, sex and systolic office BP.

    Conclusion: Masked hypertension was associated with markers of CVD. This suggests that home BP is a better predictor of risk, even when the recordings are performed with the same measurement device, in a population-based setting with randomized recruitment.

    Place, publisher, year, edition, pages
    Wolters Kluwer, 2023
    Keywords
    blood pressure, cardiovascular disease, carotid artery plaques, coronary artery calcium score, home blood pressure, masked hypertension, pulse wave velocity
    National Category
    Cardiac and Cardiovascular Systems
    Identifiers
    urn:nbn:se:liu:diva-192987 (URN)10.1097/hjh.0000000000003431 (DOI)001000477000005 ()37016927 (PubMedID)
    Note

    Funding: Swedish Heart and Lung Foundation [20160315]; Knut and Alice Wallenberg Foundation [20140047]; Swedish Research Council [82220132000]; VINNOVA (Swedens Innovation agency) [201204476]; University of Gothenburg; Sahlgrenska University Hospital; Karolinska Institutet; Stockholm County council; Linkoping University; Linkoping University Hospital; Lund University; Skane University Hospital; Umea~University; Umea University Hospital; Uppsala University; Uppsala University Hospital; Strategic Research Network in Circulation and Metabolism at Linkoping University (LiU-CircM); King Gustaf V and Queen Victoria Freemason Foundation

    Available from: 2023-04-07 Created: 2023-04-07 Last updated: 2024-07-08
    3. P-selectin and C-reactive protein in relation to home blood pressure and coronary calcification: a SCAPIS substudy
    Open this publication in new window or tab >>P-selectin and C-reactive protein in relation to home blood pressure and coronary calcification: a SCAPIS substudy
    Show others...
    2024 (English)In: Journal of Hypertension, ISSN 0263-6352, E-ISSN 1473-5598Article in journal (Refereed) Epub ahead of print
    Abstract [en]

    Background: Soluble P-selectin (sP-selectin) and high-sensitivity C-reactive protein (hsCRP) have previously been associated with hypertension, but the relation with out-of-office blood pressure (BP) and coronary artery calcification score is unknown. We aimed to examine the relationship between sP-selectin, hsCRP and home BP, as well as coronary artery calcification score and carotid artery plaques.

    Methods: In the Swedish CArdioPulmonary bioImage Study (SCAPIS), 5057 randomly selected participants were evaluated with office and home BP using the semi-automatic Omron M10-IT device. For this cross-sectional study, participants with sP-selectin <4 standard deviations above mean and hsCRP <5 mg/l, representing low-grade inflammation, were included. Using generalized linear models, these inflammatory markers were evaluated in relation to BP classifications, as well as coronary artery calcification score and carotid artery plaques.

    Results: Of participants, 4548 were included in the analyses. The median age was 57.2 (53.4–61.2) years, and 775 (17.0%) reported taking medication for hypertension. Participants in the highest quartile of sP-selectin [odds ratio (OR) 1.67, 95% confidence interval (CI) 1.40–1.98, P < 0.001] and hsCRP [OR 2.25, (95% CI 1.89–2.60), P < 0.001] were more likely to have sustained hypertension. Participants in the highest quartile of hsCRP were also more likely to have masked hypertension, OR (95% CI) 2.31 (1.72–3.10), P < 0.001 and carotid artery plaques, OR (95% CI) 1.21 (1.05–1.38), P = 0.007.

    Conclusion: Increased sP-selectin and hsCRP were independently associated with sustained hypertension. These findings indicate an association between hypertension and platelet activity, as expressed by sP-selectin.

    Place, publisher, year, edition, pages
    Lippincott Williams & Wilkins, 2024
    Keywords
    Blood pressure, selectin, CRP, inflammation, hypertension, cardiovascular disease, CACS, carotid artery plaques, masked hypertension
    National Category
    Clinical Medicine
    Identifiers
    urn:nbn:se:liu:diva-203174 (URN)10.1097/HJH.0000000000003718 (DOI)38690927 (PubMedID)
    Available from: 2024-05-01 Created: 2024-05-01 Last updated: 2024-07-08Bibliographically approved
    4. A low dose of daily licorice intake affects renin, aldosterone, and home blood pressure in a randomized crossover trial
    Open this publication in new window or tab >>A low dose of daily licorice intake affects renin, aldosterone, and home blood pressure in a randomized crossover trial
    2024 (English)In: American Journal of Clinical Nutrition, ISSN 0002-9165, E-ISSN 1938-3207, Vol. 119, no 3, p. 682-691Article in journal (Refereed) Published
    Abstract [en]

    Background

    Licorice, through the effects of glycyrrhizic acid (GA), raises blood pressure (BP). The World Health Organization has suggested that 100 mg GA/d would be unlikely to cause adverse effects, but of 13 previously published studies none have been randomized and controlled and independently quantified the GA content.

    Objective

    Our aim was to analyze the effects on home BP of a daily licorice intake containing 100 mg GA.

    Methods

    Healthy volunteers were randomly assigned to start with either licorice or a control product in a nonblinded, 2 × 2 crossover study. Home BP was measured daily, and blood samples were collected at the end of each 2-wk period.

    Results

    There were 28 participants and no dropouts. The median age was 24.0 y (interquartile range 22.8–27.0 y). During the licorice compared with control intake period, the systolic home BP increased [mean difference: 3.1 mm Hg (95% confidence interval [CI]: 0.8, 5.4 mm Hg) compared with −0.3 mm Hg (95% CI: −1.8, 1.3 mm Hg); P = 0.018] and renin and aldosterone were suppressed [mean change: −30.0% (95% CI: −56.7%, −3.3%) compared with 15.8% (95% CI: −12.8%, 44.4%); P = 0.003; and −45.1% (95% CI: −61.5%, −28.7%) compared with 8.2% (95% CI: −14.7%, 31.1%); P <0.001, respectively]. In the quartile of participants with the most pronounced suppression of renin and aldosterone, N-terminal prohormone of brain natriuretic peptide concentration increased during the licorice compared with control period [mean change: 204.1% (95% CI: −11.6%, 419.7%) compared with 72.4% (95% CI: −52.2%, 197.1%); P = 0.016].

    Conclusions

    We found licorice to be more potent than previously known, with significant increases in BP, after a daily intake of only 100 mg GA. Thus, the safe limit of intake of this substance might need to be reconsidered.

    Place, publisher, year, edition, pages
    ELSEVIER SCIENCE INC, 2024
    Keywords
    aldosterone, glycyrrhizic acid, home blood pressure, licorice, renin, aldosteron, glycyrrhizinsyra, hemblodtryck, lakrits, renin
    National Category
    Endocrinology and Diabetes
    Identifiers
    urn:nbn:se:liu:diva-200860 (URN)10.1016/j.ajcnut.2024.01.011 (DOI)001209261000001 ()38246526 (PubMedID)
    Funder
    Swedish Society for Medical Research (SSMF)Konung Gustaf V:s och Drottning Victorias FrimurarestiftelseSwedish Heart Lung FoundationSwedish Society of MedicineRegion Östergötland, RÖ 988832, RÖ 2021/3845,RÖ 2022/13418
    Note

    Funding Agencies|Strategic Research Network in Circulation and Metabolism at Linkoping University (LiU-CircM); National Research School in General Practice; Swedish Society of Medicine; Swedish Society for Medical Research; King Gustaf V and Queen Victoria Freemason Foundation; Swedish Heart Lung Foundation; Region Ostergotland; Primary Health Care Centers Research Fund, Region Ostergotland, Sweden;  [RO 988832];  [RO 2021/3845];  [RO 2022/13418]

    Available from: 2024-02-12 Created: 2024-02-12 Last updated: 2024-07-08
    Download full text (pdf)
    fulltext
    Download (png)
    presentationsbild
  • Pettersson, Axel
    Linköping University, Department of Physics, Chemistry and Biology.
    Deposition and characterisationof TiVN-thin films2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Thin films of titanium vanadium nitride (Ti1´xVx N) were grown onto WC-Co sub-strates by reactive cathodic arc deposition. Three distinct cathodes were used resulting inseven different compositions for each of the four different substrate biases -25 V, -40 V, -80 V and -100 V. Characterisation was done to investigate the phase, texture, compositionand mechanical properties by X-ray diffractometry (XRD), scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy, nanoindentation and transmission electronmicroscopy (TEM). A fcc TiVN structure dominated for all samples. The texture of thesamples was calculated and a strong (1 1 1) texture for -80 V and -100 V substrate biasesand a nearly random texture for -25 V and -40 V were found. Coatings with a high vana-dium content had a (2 0 0) texture for all substrate biases. The samples showed an increasedstress at higher substrate biases, but a decreased stress for higher vanadium content. Allfilms with the highest vanadium content a low compressive stress for all substrate biases.A decreased number of macroparticles was found at larger substrate biases and higher tita-nium content. A columnar growth was observed for all films, the surface texture was foundto change with an increase in vanadium composition and substrate bias. The samples withhighest vanadium contents deposited at -80 V and -100 V showed an additional hexagonalphase. The hexagonal phase was not found to have any significant impact on hardness,but could influence the low stress of the highest vanadium content. The grain size showedno significant difference between the films except for the mixed phase samples which hadsmaller grains due to competitive growth. The hardness of the samples were found to belie between 28 and 31 GPa for low vanadium contents, but decreased quickly for largervanadium contents to 21 GPa at the highest vanadium content. All compositions showedan increase in hardness of 3 GPa when substrate bias was changed from -25 V to -100 V.

    Download full text (pdf)
    fulltext
  • Holm, Mikaela
    Linköping University, Department of Physics, Chemistry and Biology, Biophysics and bioengineering.
    An exploratory study of the durability of biopharmaceuticals in AstraZeneca's Quality Control Operations2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master's thesis has been performed at the Quality Control department (QC) at Sweden Biomanufacturing Center (SBC), AstraZeneca. The main goal of the master's thesis was to examine if a monoclonal antibody-based (mAb) drug product (DP) at the QC laboratory is still representative of the batch after storage up to one month after opening, since today's practice states a longevity of 24h after opening. The purpose also includes investigating how the antibody is affected by different storage conditions. This could possibly lead to an extension of the durability, which would enable optimizing the usage of the biopharmaceuticals in QC operations, reducing waste and increasing the availability of DP. 

    The stability of biopharmaceuticals is monitored to ensure safe and highly effective drugs to patients. To investigate how the stability is affected by opening of the samples and different storage's, the stability of the biopharmaceutical has been evaluated by three methods: capillary electrophoresis (CE), high-performance size exclusion chromatography (HPSEC) and capillary isoelectric focusing (ciEF). These methods were performed each week during a month to monitor the progression of impurities e.g. aggregates and fragments in the DP. Results showed a slight decrease in purity for all samples. Samples in non-recommended storage condition showed a more progressed degradation than samples in recommended storage conditions. However, all samples stored in recommended storage condition passed the specifications and control limits set by AstraZeneca at all time points. Therefore, AstraZeneca is recommended to extend the durability of the DP, to two weeks after opening.

    Download full text (pdf)
    fulltext
  • Dhiman, Abhishek
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Siemens Energy AB.
    Nearest Neighbour Search Method for 3D Data Mapping of CFD Data: Steady State Thermal Analysis2024Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The advancements in computation power and the development of high-fidelity Multiphysics tools have resulted in the generation of large volumes of datasets during immense simulations. This Master’s thesis work aims to investigate the effectiveness of data mapping of the simulation results from finer meshes (large datasets) onto a coarser mesh using the nearest point method to reduce the simulation time forMultiphysics analysis such as Conjugate Heat Transfer (CHT).

    The data mapping process utilizes the nearest point method, which employs the nearest neighbour search algorithms. ABAQUS and subroutine files with FORmulaTRANslation (FORTRAN) implementation of the nearest neighbour search methods are used for the data mapping. Although various search algorithms are available in the literature, we narrowed them down to the Bin (Discretise function in MATLAB)and Octree Approach, which are then compared against the Brute Force and the explicit subroutine file creation using MATLAB code. The FORTRAN implementation of these algorithms is achieved through subroutine files and is supported by the User Defined Data Structure (UDDS) to hold the data subsets and corresponding information. The four algorithms are implemented and the performance is evaluated using metrics such as Total Central Processing Unit (CPU) time, Wall Clocktime, Compilation & Pre-Run time, and the average time of the subroutine execution(nearest point method). Additionally, for benchmarking, a Hollow Cylinder is utilized as Case1 and a complex geometric model of an Exhaust Valve as Case2 for validation and qualitative analysis of mapping results.

    The results indicate a significant improvement in the simulation time achieved with the new methodologies compared to the existing ones. Further analysis of Case1 assisted in the identification of parameters that influence the performance. The qualitative and quantitative analysis of Heat Transfer Coefficient ((HTC) and reference Fluid Temperature (SINK) contours showed strong agreement with the reference fine mesh results for both verification (Case1) and validation(Case2) cases. Performance analysis of the methodologies for multi-processor analysis(parallelization using multiple cores) highlighted the strength of new methodologies developed in this thesis work.

    Based on the current study, it can be concluded that the new methodologies developed for the nearest neighbour search have shown significant improvements over the existing methodologies. The new methodologies are robust and highly efficient in handling large volumes of structured and unstructured mesh datasets. Additionally, it can be concluded that the performance of the new methodologies for shared memory Message Passing Interface (MPI) based analysis surpasses the performance of the old methodologies for single and multi-core analysis (parallel execution).

    Download full text (pdf)
    fulltext
  • Eriksson, Emelie
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
    Period doubling in optical frequency combs2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis project explores period doubling in optical frequency combs, an area with limited prior research. An optical frequency comb can be used in telecommunications and high-precision metrologyand is a coherent set of discrete, equidistant frequency components generated from a central pumplaser frequency. To simulate the combs and the evolution of the intracavity field, the Ikeda map and two coupled mean-field equations for the period doubling regime are employed. The equations ofthese mathematical models are first derived, followed by an analytical investigation of the modulationinstability in the period doubling regime. Furthermore, the period doubling regime is simulated numerically to investigate stability and the generation of various comb patterns. During the simulations, the initial pump power is held constant while the detuning is varied. It is found that the energy was highest where the eigenvalue had the biggest real part from the analytical investigation. Additionalinstabilities is shown in results from simulations with normal dispersion.

    Download full text (pdf)
    fulltext
  • Issa, Nseir
    Linköping University, Department of Physics, Chemistry and Biology.
    Growth and Characterization of ScGaN Thin Films Using DC Magnetron Sputtering2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This diploma work explores the growth, characterization, and optimization of ScxGa1-xN thin films on sapphire and silicon substrates using direct current magnetron co-sputtering. The objective is to improve the crystalline quality of ScxGa1-xN to investigate its ferroelectric properties, driven by the growing demand for advanced information storage technologies.

    The research methodology involves refining the deposition system, calibration of substrate surface temperature, determination of growth rate, and conducting depositions with varying growth conditions.

    The investigation includes several series with varying Sc concentrations and interlayer configurations to assess their effect on crystalline quality. The first series examines the effect of varying Sc concentration (0% to 100%) relative to Ga concentration on sapphire substrates. The second series focuses on the growth of ScxGa1-xN films, with Sc concentrations from 10% to 50%, with inserting a TiN seed layer on sapphire. The TiN is acted as a bottom electrode and can reduce lattice mismatch between the film and substrate. To facilitate ferroelectric measurements, films of Sc0.05Ga0.95N, Sc0.25Ga0.75N and Sc0.37Ga0.63N, with a thickness of approximately 250 nm, were deposited with a pure Ti top electrode. Additional samples with a thinner 30 nm film and Ti top electrode were also produced for ferroelectric measurements.

    The third series includes a sapphire substrate with an AlN nucleation layer and a GaN buffer layer beneath the ScxGa1-xN film. The fourth series mirrors the third, substituting sapphire with HF-treated silicon (111).

    To determine the structural properties, these ScxGa1-xN films were characterized using scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), and x-ray diffraction (XRD) for investigating morphology, composition, and crystallinity, respectively.

    Results from the first series demonstrated that increasing Sc concentration up to 24% doesn’t affect the crystal quality much, evidenced by a small peak angle shifts in XRD measurement. However, beyond 24% Sc, the films exhibited a structure where the long-range order is lost due to lattice disorder. Electrical measurements revealed a sharp increase in sheet resistance with low Sc concentrations, making it unmeasurable between 14% and 54% Sc levels. Yet, at high Sc concentrations, sheet resistance decreases.

    Results from the second series revealed similar trends for the crystal quality measurements as the first series. For the electrical measurement, excessive resistive leakage between the top and bottom electrodes unfortunately made it impossible to obtain any meaningful ferroelectric data.

    In the third and fourth series, incorporating different interlayers and substrates allowed for higher Sc concentration without degrading film quality. However, due to the overlapping XRD peaks of GaN buffer layer and ScxGa1-xN, it was difficult to provide conclusive evidence of this improvement.

    Download full text (pdf)
    Growth and Characterization of ScGaN Thin Films Using DC Magnetron Sputtering
  • Rosén, Sara
    Linköping University, Department of Computer and Information Science.
    Cognitive Accessibility and E-commerce: Evaluation of a Cognitive Criterion2023Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to examine the suitability of the cognitive criterion indication of progress in a visually described process of tasks, developed as part of a cognitive criteria project, for e-commerce websites. Two high-fidelity prototypes of a fictional e-commerce website were developed, one where the criterion was implemented and one where it was not. These were then tested by seven (n = 7) users with one or more neuropsychiatric disabilities. The usability tests showed a general preference for the prototype where the criterion was not implemented, possibly due to a multiple step implementation approach. User effectiveness, satisfaction and success were also impacted negatively by the implementation of the criterion, though there was no significant difference between the prototypes and both prototypes received a SUS-score > 84. Additionally, users did not notice all the differences between the prototypes. An alternative design was developed based on the results, implementing the criterion without dividing steps into multiple pages, however this was not tested. Further research should be done to see how the implementation of the criterion without a multi-step approach affects the success, effectiveness, and satisfaction of users with neuropsychiatric disabilities. The study also shows that the formulation of the criterion is ambiguous and in need of further development.

    Download full text (pdf)
    fulltext
  • Selander, Siri
    et al.
    Linköping University, Department of Management and Engineering, Industrial Economics.
    Paulsen, Alice
    Linköping University, Department of Management and Engineering, Industrial Economics.
    Cultivating success: Pricing and Funding in the Digital Landscape2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The digitization trend is prevalent throughout our society and impacts various industries. This development has resulted in even physical products, traditionally driven by gasoline engines and not connected, moving towards being connected and powered by electricity. As a consequence, the competencies required to service these products have changed, leading to an increased need for digital platforms and tools to update and service these physical products.

    However, with the development of these digital tools comes a challenge in how they should be funded and priced, as there is a lack of familiarity with pricing digital tools. Additionally, since service tools can be considered support tools rather than pure products, it can be questioned whether companies should charge external actors for such tools. One of the companies facing these challenges is the case company of this research, which in spring 2023 launched a support tool (in this paper referred to as The Service Tool (TST)), targeted at its authorized dealers and service centers (service partners). 

    With the case company as the starting point, the following thesis project has focused on examining the traveling ideas on pricing and value within a company primarily manufacturing and selling physical products and how these ideas influence the pricing of digital support tools, as well as how such an organization can fund such a support system. Through qualitative methods, including 21 semi-structured interviews, the study analyzes employees' perspectives using a model based on business ecologies, business models, and price models.

    The study revealed several internal and external factors that have influenced TST's current price model. These ideas have influenced all five dimensions of the price model equalizer (Cöster et al, 2020). An awareness of the ideas that are present within the business ecology and how these ideas influence price models allows for price model innovation, makes it easier to avoid thoughtless decisions on pricing and makes it possible to differentiate from competitors. Furthermore, the study found that TST is mandatory for some service partners but not for all, as it is a differentiated customer group. This affects how well different ways of funding TST are suited. Six ways to fund TST were identified, and the suitability of each strategy depends on contextual factors. The study also identifies possible adjustments to the price model.

    The study highlights the importance for organizations to understand the ideas surrounding value and pricing that circulate within the organization and how these impact operations, enabling more informed decisions regarding business and price models. Although the research is centered around a specific case company, it serves as a reference for other firms seeking insights into pricing strategies. Specifically, the research contributes to the literature by demonstrating an application of the price model equalizer (Cöster et al., 2020) and an alternative use of the framework on mandatory and discretionary IT investments developed by Joshi and Pant (2008).

    Download full text (pdf)
    Cultivating success: Pricing and Funding in the Digital Landscape
  • Mohlin, Fredrik
    Linköping University, Department of Computer and Information Science.
    Implementation and Evaluation of a Mobile Tour Guide with Group Synchronised Audio: using web technologies, QR Codes, and Speech Synthesis2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Listening to online audio is growing in popularity, while research suggests that the popularity of audio guides is influenced negatively by a lack of user-friendliness. Much of the research on mobile tour guides is obsolete, and more research needs to be done regarding design choices. This thesis evaluates a mobile tour guide used for audio guides and implemented using web technologies. Functionalities include audio selection with QR codes, audio narration using speech synthesis and synchronised audio playback with groups. The mobile tour guide system was evaluated with User Experience Questionnaire, which indicated a positive user experience but with a lot of uncertainty due to the small subject sample size. The aspects of user experience that received the highest ratings were the system's efficiency and clarity, while its novelty was rated the lowest.

    Download full text (pdf)
    fulltext
  • Atoui, Josef
    et al.
    Linköping University, Department of Computer and Information Science.
    Mattfolk, Erik
    Linköping University, Department of Computer and Information Science.
    Encouraging social interactions for gym goers using gamification techniques2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Applying gamification to encourage, motivate and aid users in different contexts, such as E-learning, E-commerce and E-health, has become a major subject of research. However, research on how it affects users in a social context is still vague. This thesis aims to provide further insights into the topic by investigating how applied gamification affects gym goers using a social media application. 

    To simulate a test, a cross-platform mobile application was implemented with social aspects that covered both digital and physical interactions between users. The test was conducted during a 10-day testing window in which 24 testers participated. To complete the test, the participants had to submit their experiences in a questionnaire based on the GAMEFULQUEST.  

    The insights collected showed that, in some sense, applying gamification worked to encourage users to socialize more, as their actions were rewarded with points or badges. However, the results are inconclusive, as many of the testers expressed that the simulation may have impacted their actions as well.

    Download full text (pdf)
    thesis
  • Blomkvist, Katarina
    et al.
    Department of Business Studies, Uppsala University, Sweden .
    Engzell, Jeanette
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering. Department of Business Studies, Uppsala University, Sweden .
    Kappen, Philip
    Department of Industrial Economics and Management, KTH Royal Institute of Technology, Stockholm, Sweden .
    Zander, Ivo
    Department of Business Studies, Uppsala University, Sweden .
    How organizational conditions affect employees’ intentions to engage in intrapreneurial new venturing2024In: Technovation, ISSN 0166-4972, E-ISSN 1879-2383, Vol. 135, article id 103046Article in journal (Refereed)
    Abstract [en]

    Many businesses are finding it difficult to strengthen employees’ intentions to engage in intrapreneurial new venturing. In this study, we investigate the organizational conditions that are conducive to the formation of such intentions, specifically employees’ intentions to initiate the development of new products or services in their host corporation. The results from a survey of 3492 employees of Swedish companies, including small, medium-sized, and large firms, reveal that recognizing and rewarding personal achievements, maintaining a risk-taking organizational culture, and top management support are all associated with stronger employee intentions to engage in intrapreneurial new venturing. There is weaker support for the predicted positive effect of personal independence and the presence of intrapreneurial role models. Time availability appears to have an inverted ushaped relationship to employees’ intentions to engage in intrapreneurial new venturing. Overall, the findings support the idea that organizations can be purposefully designed for strengthening intrapreneurial new venturing among their employees.

    Download full text (pdf)
    fulltext
  • Engzell, Jeanette
    et al.
    Linköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering.
    Kambanou, Marianna Lena
    Linköping University, Department of Management and Engineering, Environmental Technology and Management. Linköping University, Faculty of Science & Engineering.
    Incumbents versus circular start-ups in the workwear industry: Organisational and individual drivers and barriers to a circular economy2024In: International Small Business Journal, ISSN 0266-2426, E-ISSN 1741-2870, Vol. 42, no 4, p. 551-580Article in journal (Refereed)
    Abstract [en]

    This article analyses the organisational and individual drivers and barriers to the implementation of circular business models (CBM) by incumbents and start-ups in the workwear industry. It is based on a qualitative study of 15 organisations in the Swedish workwear industry. Most incumbents are found to have either long-life models with hybrid elements, such as repair, or access models, while circular start-ups have a larger variety of CBMs, although the most common is gap exploiter. Internal organisational barriers mostly differ between the two groups; however, external organisational barriers are more significant and common, such as the low price of new workwear, a lack of demand and a lack of supporting policies, for example, public procurement. Several organisational drivers are identified, such as opportunities to deliver customer value, textile and digital innovations and environmental concerns. Drivers and barriers are influenced by both type of CBM and type of company. Individual drivers and barriers, which are often overlooked in literature, are found to be important to CBM implementation.

    Download full text (pdf)
    fulltext
  • Tavares, Julia
    Linköping University, Department of Culture and Society, Division of Migration, Ethnicity and Society (REMESO).
    The Healing Power of Art: Using Art-Based Approaches Towards SOGIESC Refugees’ Psychological Well-Being2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Throughout their lives, SOGIESC refugees continuously face complex circumstances with thepotential to raise mental health concerns. As a consequence, devising initiatives which effectivelyenable psychological well-being to these groups becomes imperative. However, SOGIESC refugees'complex psychosocial needs require culturally-sensitive, multidimensional responses that traditionalWestern-centric approaches have been insufficient to provide. Alternatively, art-based interventionshave successfully enabled sensitive and holistic psychological support in multiple instances, andthus arise as a promising way forward. Yet, such approaches focused on SOGIESC refugees are stilluncommon, in both practice and in academia. In this study, I contribute to filling this gap byanalyzing ways in which art-based interventions can be valuable for providing psychologicalwell-being, while also identifying potential effective practices for the implementation of suchapproaches for SOGIESC refugees. To do so, I explore three case studies of art-based interventionsfor mental health as a method for pinpointing these practices, while also drawing upon a theoreticaland conceptual framework to discuss if and how they can be successfully applied in the case ofSOGIESC refugees. This method enabled me to identify several potentially effective practices forthe implementation of these approaches, based on the most salient factors found to impact theirresults: the aim of the intervention, the implementer organization and their implications for structureand outreach, facilitator types and strategies, and additional important measures. 

    Download full text (pdf)
    fulltext
  • Voith, Julian
    Linköping University, Department of Computer and Information Science, Human-Centered Systems.
    Enhancing the player experience by creating an engaging cooperative NPC experience in a procedurally generated game world2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Creating a convincing and elaborate game world to provide an engaging and immersive player experience is not straightforward and can involve many different approaches. Across game genres, these worlds are populated by other players or deterministic non-playable characters (NPCs). NPCs can enhance the game's realism and contribute significantly to the player experience, engagement, and immersion. One way to influence the player's experience with NPCs is by creating a cooperative experience. The primary aim of this thesis is to design and implement cooperative gameplay mechanics that positively impact the player experience. The research includes a comprehensive literature review to identify suitable cooperative design patterns for NPCs, which were then adapted and integrated into the “Core Keeper” game developed by Pugstorm AB. The development of multiple cooperative gameplay mechanics followed a structured approach, including the design, implementation along three high-level game design patterns, and evaluation of the player experience with game developers and experts. The evaluation was conducted through user testing and divided into two phases. The two phases allowed a comparison between the player experience of the native gameplay and gameplay with the implemented cooperative NPC features, using the Player Experience of Needs Satisfaction (PENS) questionnaire. Additional insights were gathered through observations during the evaluation. The results indicate a significant improvement in the player experience compared to the native gameplay. This work contributes to the field by providing a set of design patterns for creating a cooperative experience with NPCs and valuable insights for researchers and game developers.

    Download full text (pdf)
    fulltext
  • Nyström, Erik
    et al.
    Linköping University, Department of Computer and Information Science.
    Salomonsson, Emil
    Linköping University, Department of Computer and Information Science.
    Physical security as-a-service: Opportunities and Challenges: An exploration of how physical security could be offered within the as-a-service business model for small enterprises in retail2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Servitisation, entails a shift where companies move from offering products, to providing a holistic package that includes products, services, support and knowledge with the goal of providing value to the customer. A business model that has this very focus, is the as-a-service business model which gained popularity within the field of IT around the 19´s. Because of it´s success, the as-a-service model has been adopted by many companies outside the field of IT in order to leverage its benefits. However, companies offering physical security services does not seem to have adopted the business model yet. As research is vague regarding offering physical security as-a-service, it was found interesting to explore this very subject through this thesis. This thesis focuses on the customer segment of small enterprises in retail, and explores opportunities and challenges of offering physical security services as-a-service (PSaaS) to them specifically. The thesis work was conducted in collaboration with the global security service provider Securitas Intelligent Services (SIS) AB as a case company. A combination of gathered literature in relevant fields, information provided by the case company, interviews held with the case company and interviews held with customers from the customer segment laid the foundation for the collection of data. The data was used in order to generate ideas. The generated ideas then led to the creation of two prototypes of potential new services within PSaaS. The two prototypes were tested on the customer segment and evaluated using a formative approach where customer input was gathered as well as a Net Promoter Score. The results was then analysed and discussed in order to identify opportunities and challenges when offering PSaaS for small enterprises in retail, as well as what the customers specifically valued in the created prototypes. The analysis show that centralising assets through PSaaS standardises operations and offers flexible resource scaling based on customer needs. Enhanced technology integration enables larger sales volumes and continuous innovation via data from technological assets. PSaaS bridges the knowledge and experience gap existing in the customer segment by incorporating expertise. However, building a strong customer-provider relationship is challenging, as customers are hesitant to invest time and energy. Trust is critical, particularly with reliance on AI calculations and risk notifications. Motivating customers to pay for additional services is a challenge due to conflicting dynamic pricing strategies and their preference for predictable costs. Despite these challenges, PSaaS offers benefits similar toearly SaaS models, particularly for smaller businesses without dedicated security personnel. Addressing customer reluctance to engage in physical security tasks is crucial, given limited experience and time constraints. The created prototypes were perceived positively by the customers, scoring an average Net Promoter Score of 8,5/10 and 6,75/10. The customers valued increased assistance following a security breach, transparency of risk and the ability to take action on dynamic risk. However, it was mixed opinions regarding the extent to which the security provider could take action without the customers’ involvement and consent.

    Download full text (pdf)
    fulltext
  • Samuelsson, David
    et al.
    Linköping University, Department of Management and Engineering.
    Norwald, Gustav
    Linköping University, Department of Management and Engineering.
    Avknoppningar - Börsens splittrade favoriter?: En kvantitativ studie om avknoppade bolags abnormala avkastning2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: Att investera i avknoppade bolag har bevisats vara en lukrativ investeringsstrategi i USA medan det finns motsättningar kring fenomenets verkliga existens på den svenska aktiemarknaden. Vidare har inte svenska avknoppningar undersökts i stor utsträckning till följd av en skattemässig reglering som ändrades först år 1991 och som tidigare motverkade avknoppningar. 

    Syfte: Syftet med denna uppsats är att undersöka och förklara den riskjusterade abnormala avkastningen hos avknoppade bolag genom finansiella variabler.

    Metod: Studiens metod är utformad efter en kvantitativ metod med en deduktiv ansats. För att besvara syftet beräknas abnormal avkastning ut genom Capital Asset Pricing Model (CAPM) som därefter används via Cumulative Abnormal Return (CAR) och Buy-and-Hold Abnormal Return (BHAR) som därefter testas för signifikans med t-tester. Därefter genomförs regressioner med Fixed-Effect på paneldata för att undersöka vilka variabler som har en signifikant påverkan på den abnormala avkastningen. De finansiella variablerna som används är skuldsättningsgrad, price/book-kvot, räntabilitet på totalt kapital och omsättning per aktie. 

    Resultat: Studien finner att de svenska avknoppningarna har presterat över sin riskjusterade avkastning och den svenska aktiemarknaden på såväl ett, två, tre, fyra, fem och tio års sikt. Price/Book är den enda variabeln som signifikant kan förklara den positiva abnormala avkastningen vilket indikerar att avknoppningarna i regel är lågt värderade initialt för att sedan värderas upp över tid på aktiemarknaden. 

    Download full text (pdf)
    fulltext
  • Gustavsson Vester, Alvin
    Linköping University, Department of Electrical Engineering.
    Modeling of a Fighter Jet with Application to Fast Simulation2024Independent thesis Advanced level (degree of Master (Two Years)), 28 HE creditsStudent thesis
    Abstract [en]

    A game engine is being developed at the Swedish Defence Research Agency FOI, which shall contain fixed wing aircraft in motion. When simulating many aircraft in order to qualitatively analyze scenarios, the purpose is not necessarily to maximize the accuracy in prediction of motion for each aircraft, but to simulate the overall behavior of a set of aircraft. It is then likely that reducing the complexity of the underlying aircraft model to decrease computation time is worth a slight change in the dynamics. When simulating longer scenarios, change in mass will affect the forces needed for propulsion and maneuvers. An implementation of an existing model for the F-16 Fighting Falcon was implemented in C++, extended with a model for fuel consumption, and three options for reduction of evaluation time investigated when simulating with feedback for trajectory following. The results showed that usage of quaternions instead of Euler angles reduced the evaluation time by 25%. It could further be decreased by 40% with the usage of polynomial expressions for the aerodynamic forces and moments, instead of interpolation in lookup tables, with the cost of slight change in the dynamics and outputs of the model. Removing the motor dynamics showed negligible difference in evaluation time. Combining the changes, the execution time could be decreased by 65%.

    Download full text (pdf)
    fulltext
  • Kerem, Çelik
    et al.
    Linköping University, Department of Management and Engineering.
    Grennäs, Jonathan
    Linköping University, Department of Management and Engineering.
    Kompetenser för framtidens redovisare: En kvantitativ explorativ studie om redovisares ställning på arbetsmarknaden efter AI-boomen2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Introduction: The introduction of new tools has enabled accountants to work more efficiently, from the abacus to the computer. The knowledge has not changed, but have the skills? And are they expected to? Opinions are divided. The impact of AI on the perception of accountants’ skills has not yet been established.

    Purpose: The purpose of the study is to explore the skills of accountants, including how employees (accountants themselves) and employers perceive them, and to investigate whether AI has influenced the perception of accountants’ skills.

    Method: A quantitative method with a deductive approach was used to explore the skills of accountants. Data collection included 200 job advertisements, analysed using cross-tabulations and logistic regression, followed by a questionnaire examined using exploratory factor analysis, correlation matrices, and regressions in SPSS.

    Conclusion: The findings suggest a shift from previous research, where employees (the accountants themselves) value soft skills more than before, although hard skills are still considered essential both now and in the future. Correspondingly, employers tend to value hard skills more. Although Technology Acceptance Model (TAM) can be applied to the accounting industry, it has not been proven whether AI has influenced the perception of the skills. All results should be interpreted with caution.

    Download full text (pdf)
    fulltext
  • Housset, Charlotte
    Linköping University, Department of Culture and Society.
    Local Roots, Global Minds: Identity formation and sense of belonging through the eyes of high school exchange students2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This master’s thesis aims to explore the issues surrounding the identity and sense of belonging of high school students who participated in a long-term exchange. It further investigates their role in future student mobility trends. Drawing on concepts such as the transnational habitus, the culture shock, or the sense of belonging through the third culture, the thesis uses a qualitative methodology with four semi-structured interviews. It will discover the developments of identity and sense of belonging of high school exchange students in the aftermath of their long-term exchange. Following differentiated levels of identification and belonging, the thesis argues that participants are endowed with a global mindset, while at the same time being rooted in their home country. This leads to the development of an intercultural habitus – a concept suggested in this thesis. It will contribute to a deep understanding of their experience and how this specific type of mobility is valued within privileged societal spheres. Grasping this process of identity and sense of belonging shaping is an important foundation for international student mobility and its intercultural perspective.

    Keywords: interculturality, transnationalism, habitus, high school exchange, exchange student, belonging, identity, AFS

    Download full text (pdf)
    fulltext
  • van Alphen, Jan
    et al.
    Linköping University, Department of Management and Engineering.
    Backman, Nicole
    Linköping University, Department of Management and Engineering.
    Knowledge Acquisition and Adaptation Strategies of First- Generation Swedish Winemakers2024Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis explores the knowledge acquisition and adaptation strategies of first-generation Swedish winemakers, who are pioneering in an industry traditionally dominated by long- established practices. As Sweden lacks deep-rooted winemaking traditions, these winemakers face unique challenges in adapting to the country's specific climatic and regulatory environment. Through qualitative case studies and in-depth interviews with nine Swedish wineries, this research identifies key strategies employed by these winemakers to learn and innovate. The findings reveal that experiential learning and continuous adaptation are critical for these winemakers, allowing them to respond effectively to Sweden's variable climate conditions. They balance traditional winemaking techniques with innovative practices, drawing on established knowledge from traditional wine regions while integrating new methods tailored to their unique context. Community engagement and knowledge-sharing networks are also essential, fostering a collaborative environment that supports the growth and resilience of the Swedish wine industry. This study highlights the importance of blending tradition and innovation in emerging wine regions and underscores the role of community and networking in knowledge acquisition. The implications of these findings suggest that new entrants in the wine industry can successfully establish themselves by leveraging both experiential and external knowledge sources. Future research should explore the long-term sustainability of these strategies and examine comparative studies between Swedish winemakers and those in other emerging regions to identify best practices and potential areas for collaboration. 

    Download full text (pdf)
    fulltext
  • Valo, Ida
    et al.
    Linköping University, Department of Culture and Society.
    Tchernova, Fredrika
    Linköping University, Department of Culture and Society.
    Medias makt: En kvalitativ diskursanalys om mäns våld mot kvinnor i svensk nyhetsrapportering2024Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study aims to investigate if there is a discourse that normalizes men's violence against women in the articles of two Swedish newspapers. The material used for this study consists of headlines and introductions from articles in these two newspapers, all which address the topic of men's violence against women between the years of 2020 and 2024. To analyze the material, we used Fairclough's three-dimensional model, which is part of the critical discourse analysis (CDA). Furthermore, the analysis is divided into four parts: the impact of the COVID-19 pandemic on men's violence against women, the explanation of the violence, the portrayal of women and the risk of being a woman. After using Faircloughs three-dimensional model, we could conclude that the news reports about men's violence against women tend to reproduce a discourse about women's vulnerability and blame, which in turn normalize the violence. They normalize the violence through the choice of wording and sentence construction that form the headlines and the introductions. Moreover, men and women are portrayed differently in the articles because the papers often provide explanation for the violence and focus on the actions of the woman, the man then being a victim of the circumstances. The characteristics of the text and the discursive practices that the text is part of shows that the men who commit acts of violence against women rarely need to take responsibility for their actions, because the violence is explained by other circumstances. We could also see that the discourse that takes place in Swedish news tend to proceed from the man's perspective because in many of the articles the man was the only one who got to talk about the violence and what happened. Swedish news also tends to express themselves in a way that confirm and reproduces the image of the man as superior, and the woman as subordinate

    Download full text (pdf)
    Medias makt
  • Hedin, Andreas
    et al.
    Linköping University, Department of Management and Engineering.
    Pelle, Nyberg
    Linköping University, Department of Management and Engineering.
    Krigets hetta på aktiemarknaden: En studie om hur Rysslands invasion av Ukraina påverkat volatiliteten på olika typer av aktiemarknader2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: Global events such as wars, pandemics, and natural disasters can rapidly impact economies worldwide. The so called "Black swan events" describe unpredictable and extraordinary events with significant consequences. Over the past century, crises like world wars, the Great Depression, and the financial crisis 2007 have shaped our societies that we are living in. Recently, Russia's invasion of Ukraine in 2022 has caused commodity price hikes, energy issues and affected global trade. The study focuses on how the Russian invasion has influenced volatility in global stock markets, find correlations between social variables and volatility with the regard on degree of developed stock markets to illustrate how geopolitical tensions can lead to economic chocks.

    Purpose: The purpose of the study is to analyze how volatility before, during, and after Russia's invasion of Ukraine relates to institutional variables such as democracy, social prosperity, economic freedom, and geography.

    Methodology: Using a quantitative method with a deductive approach, we investigate volatility before, during, and after Russia's invasion of Ukraine across the 47 countries included in the MSCI ACWI IMI index. This sample comprises of 24 developed and 23 developing markets of diverse characteristics. Regressions, ANOVA tests, and Chow tests are conducted to analyze relationships between market volatility and variables including the Human Development Index, democracy index, economic freedom index, and geographic location.

    Results: The study shows that volatility is significantly higher after the invasion than in the pre-war period. Although general conclusions about the variables' association with volatility during the war cannot be drawn, the study finds that increased economic freedom in developed markets reduces volatility after the war's start, and more democratic countries exhibit lower volatility before the war. The study shows that developed markets respond more quickly to unrest, which can be explained by more efficient information flows. Geographical and psychological distances affect the crisis's spread, and specific commodities, such as oil, act as a buffer against volatility for certain markets.

    Download full text (pdf)
    fulltext
  • Ahlsén, Christoffer
    et al.
    Linköping University, Department of Management and Engineering. Linköping University, Faculty of Arts and Sciences.
    Elfstrand, Vilma
    Linköping University, Department of Management and Engineering. Linköping University, Faculty of Arts and Sciences.
    Unlocking Sustainability: Do ESG Disclosures Affect IPO Underpricing?2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: Environmental, Social, and Governance (ESG) sustainability isreceiving increased attention and significance within the corporate sector. Previous research has investigated ESG and its impact on Initial Public Offerings (IPOs), more specifically underpricing. However, previous studies do not give a complete understanding of the relationship between ESG information and underpricing in IPO contexts. Further, this relationship remains unexplored in the Swedish market, presenting an interesting and valuable opportunity for analysis.

    Purpose: The purpose of this thesis is to analyze the relationship between ESG information disclosed in the IPO prospectus and the underpricing of IPOs in Sweden.

    Method: The thesis uses a quantitative and deductive research approach. Two hypotheses were generated from existing literature, focusing on the quantity and the textual tone of ESG disclosures. Data was primarily collected through prospectuses from 65 Swedish corporations, and textual analysis was used to assess disclosed ESG information in terms of quantity and tone. The entirety of ESG and each ESG dimension were measured. The data was analyzed through the statistical program SPSS, with the help of regression analysis.

    Results: The thesis reveals a significant positive relationship between underpricing and quantity of social- as well as overall ESG-related disclosures. Further, a significant positive relationship was observed between underpricing and a positive tone in governance- as well as overall ESG-related disclosures.

    Download full text (pdf)
    fulltext
  • Lindkvist, Filip
    et al.
    Linköping University, Department of Management and Engineering.
    Sonerud, Ludwig
    Linköping University, Department of Management and Engineering.
    Nollräntans skymning: En kvalitativ studie om generation Zs investeringsbeslut under styrränteförändringar.2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: During the years 2022-2023, the fastest interest rate hike in modern times has taken place, which has increased capital costs, reduced the availability of cheap capital, and thus dampened investment appetite in the financial markets. The key interest rate in Sweden has risen from the lowest level in history to the highest in over a decade. The Stockholm Stock Exchange started the same period with a decline of 22.31 percent in 2022, only to rise by 18.36 percent in 2023. Previous studies show that most professional managers fail to generate a risk-adjusted excess return compared to the S&P 500 index. Even fewer private investors manage to outperform such an index. Despite this challenge, interest in stock investments continues to grow. A significant portion of the new group of investors consists of young people born between 1997 and 2009, also known as Generation Z. These individuals lack previous experience of a similar economic change. They are therefore more likely to be exposed to risks, as research shows that experienced investors tend to perform better during unstable times. 

    Purpose: The purpose of the study is to examine the occurrence of suboptimal investment decisions among young people based on the interest rate hike that occurred during the period 2022–2023. By investigating how the psychological biases of herd behavior, disposition effect, present bias, and overconfidence have affected Generation Z, the study aims to increase the understanding of investment decisions among young adults. 

    Method: The purpose of the study has been answered using a qualitative method with data collection through semi-structured interviews consisting of 8 investors from generation Z. 

    Conclusion: The study shows that private investors from Generation Z did not experience significant changes in their investment horizon, strategy, and goals during the period 2022- 2023, with risk tolerance being the primary factor that has changed. These investors' understanding of behavioral finance makes them aware of, but not immune to, the impact of biases. Although conscious strategies limit the effects of biases, unconscious strategies can still be formed and influence their investment decisions.

    Download full text (pdf)
    fulltext
  • Lundman, Casper
    et al.
    Linköping University, Department of Management and Engineering.
    Melander, Noelle
    Linköping University, Department of Management and Engineering.
    Navigating Human-Robot Interaction in Voluntary Work Recruitment: Exploring the differential impact of robot interaction versus human interaction in the recruitment of voluntary workers2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Robots and artificial intelligence are becoming an increasingly central part of today’s society. With the implementation of the two in various organizational functions, the question of their capability is highly relevant. Within the field of voluntary work, recruitment plays a crucial role. There are many different reasons as to why humans decide to work voluntarily, which is a prosocial behavior. This raises the question of how robots could perform in recruiting people for voluntary work, and if and how robots can induce prosocial behavior into humans. This study investigates the potential of humanoid robots to replace or complement humans in recruiting voluntary workers. The research aims to compare the effectiveness of human interaction with that of humanoid-robot interaction in influencing individuals’ willingness to engage in voluntary work. By examining the dynamics of perceived social connection, warmth, and competence in interactions with humans and robots, the study seeks to uncover the unique aspects of human-robot interaction that impact individuals’ motivation to participate in voluntary work.

    Download full text (pdf)
    fulltext
  • Johansen, Oliver
    et al.
    Linköping University, Department of Management and Engineering.
    Östman, Fanny
    Linköping University, Department of Management and Engineering.
    Lärares attityder till artificiell intelligens: Universitetslärares syn på artificiell intelligens på lärarprogrammet2024Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background: This study investigates the attitudes of teachers in teacher education programs towards the implementation of artificial intelligence (AI) in higher education. AI has garnered significant attention in recent years, especially following the launch of ChatGPT. AI has also experienced rapid growth and integration in educational contexts, where there is a lack of understanding of teachers' attitudes towards the role of this technology in teaching. Teachers' opinions are central to gaining an understanding of the extent to which AI should be used or not.

    Purpose and research question: The purpose of this work is to investigate teachers' attitudes towards the use of artificial intelligence in teacher education. Since attitudes have a significant impact on behavior, this work aims to examine whether teachers choose to incorporate AI into their teaching for students in teacher education programs or not. The research question is therefore: How can university teachers' attitudes towards artificial intelligence support or hinder the use of AI in teacher education?

    Method: The research design of the study employs a qualitative approach with a cross-sectional design. The research perspective in the study is hermeneutic, employing an inductive approach to further develop the hermeneutic approach and thereby create additional understanding. The empirical data has been collected through ten semi-structured interviews with university teachers from a Swedish university. Finally, grounded theory was utilized as the analysis method, where we employed our own analysis model to analyze our empirical data.

    Conclusion: The conclusions of this study encompass three main factors influencing university teachers' attitudes towards AI in education: relevance, concern, and knowledge. Despite initial concerns, the results indicate an overall positive attitude, with variations depending on the subject and level of expertise. The initial concerns primarily revolved around cheating and overuse, as well as a lack of knowledge negatively impacting teachers' attitudes. Knowledge about AI and its relevance in education appear to be significant factors shaping teachers' attitudes towards its usage.

    Download full text (pdf)
    fulltext