Publikationer från Uppsala Universitet
Not a member yet
127603 research outputs found
Sort by
Data quality assessment in the SWEDEHEART registry : Insights from serial audits on completeness and accuracy
No full textBackground: Registry data used to monitor clinical care need to be reliable, and the process for assuring data quality transparent. Here the auditing process of the Swedish quality registry for cardiac disease, SWEDEHEART, is described. Methods: SWEDEHEART audits have been performed at 4 time-points in 2011 to 2018, with data quality audited in the 3 largest subregistries covering acute coronary syndromes (ACS), percutaneous coronary interventions (PCI), and cardiac rehabilitation (CR). Data is audited against electronic medical records by 4 controllers, centrally coordinated by a project leader. During the 2011 audit 13/71 (18.3%) of ACS-admitting hospitals and 8/28 (28.6%) of coronary catheterization labs reporting to the registry were audited. During the 2017 to 2018 audit all reporting sites (100.0%) were audited: 72 hospitals, 30 catheterization labs, and 75 CR centres, with more than 200,000 data points controlled. Results: Overall data completeness in the 2017 to 2018 audit was as follows: SWEDEHEART-ACS 99.1%, SWEDEHEART-PCI 99.2%, and SWEDEHEART-CR 94.5%. The accuracy of registry data compared to electronic medical records was > 95.0% for all subregistries at all 4 audits ( P for trend < .0001), in 2017 to 2018 as follows: SWEDEHEART-ACS 97.5%, SWEDEHEART-PCI 98.4%, and SWEDEHEART-CR 95.8%. Data most often incomplete or inconsistent were data on time points, self-reported data, and data reliant on complex definitions. Conclusion: The SWEDEHEART registry is a highly complete and accurate source of patient characteristics and processes of care, that can be reliably used for quality improvement such as monitoring quality of care, to compare hospitals at site-and national level, include in international comparisons, and for conducting high-quality registry-based research
Trygg eller styrd, hur upplevs “smart teknik” i det offentliga rummet? : En studie om kvinnors upplevda trygghet och integritet i Bagarmossen
No full textDenna uppsats undersöker hur trygghet och teknik samspelar i det offentliga rummet, med fokus på Stockholms stads trygghetsprogram och kvinnors upplevelser i Bagarmossen. Studien utgår från två metoder, en tematisk dokumentanalys av kommunens trygghetsprogram samt en enkätundersökning riktad till kvinnor i det utvalda området. Det teoretiska ramverket består av kritiska teknologistudier och genusteori. Tillsammans möjliggör dessa teorier en förståelse för hur teknik och trygghet formas i samspel med maktstrukturer, normer och könade erfarenheter. Analysen visar att trygghet i styrdokumentet framför allt förstås som något som ska hanteras genom tekniska verktyg och mätbara metoder, medan kvinnors erfarenheter får begränsat utrymme. Enkätsvaren visar att många kvinnor anpassar sitt rörelsemönster utifrån tid, plats och närvaro av andra människor. Det visar också att teknik både kan upplevas som trygghetsskapande och begränsande. Studien belyser en klyfta mellan kommunala visioner och vardagliga erfarenheter och visar att genus är en avgörande faktor för hur trygghet upplevs och formas i praktiken.
To weave in Asine
No full textUnder flera årtusenden var vävning en essentiell del av det grekiska hushållet. På grund av nedbrytningsprocesser finns sällan textilier och vävstolar kvar, och forskare behöver därför analysera vävtyngder. Vävtyngderna gjorde vävningen möjlig och kan berätta om vävningsprocessen. Idag hittas vävtyngder på de flesta arkeologiska utgrävningarna i Grekland. Denna studie fokuserar emellertid på den hellenistiska bosättningen i Asine i norra Peloponnesos, där omkring 500 vävtyngder har påträffats. Syftet med studien är att undersöka var textilproduktionen skedde och vilka textilier den producerade i hellenistiska Asine. För att besvara detta måste undersökningen applicera en rumslig analys och arbeta med tidigare studier för att förstå hur textilier producerades. Studien argumenterar för att textilproduktionen var lokaliserad i Asines Lågstad samt att flera hus än tidigare antaget var kopplade till denna verksamhet. Avslutningsvis kan studien fastställa att det producerades en stor variation av tyger med olika tjocklek, material och storlek. For many millennia, weaving was an essential part of the household in ancient Greece. Because of fragile materials, both textiles and looms are rarely preserved in the archaeological record, and researchers must rely on loom weights as proxies. These artifacts made the weaving possible and provide valuable insights into the weaving process as well as the final textile products. Today, loom weights can be found on most archaeological sites in Greece. This essay focuses on findings from the Hellenistic settlement in Asine in northern Peloponnese where approximately 500 loom weights have been found. The aim of the study is to examine where the textile production took place and which textiles it produced in Hellenistic Asine. To complete this, the study must apply a spatial analysis and use previous experiments to understand how the textiles were produced. The study concludes that the textile production was localised in the Lower town and that there were more Hellenistic houses where the textile production took place. Furthermore, the analysis reveals that Asine produced a big variety of textiles with different thickness, material and size.
Mellan regelverk och praktik : En kvalitativ studie om GDPR:s påverkan på informationssäkerhetsarbete
No full textInformationssäkerhet är en central del av IT-säkerhetsarbetet och går ut på att behålla konfidentialitet, integritet och tillgänglighet för informationen. GDPR är det huvudsakliga regelverk som reglerar informationssäkerheten för organisationer inom EU, men att efterleva de legala krav som ställs av GDPR blir allt mer komplext, samtidigt som behovet av adekvat informationssäkerhet blir allt mer relevant i en värld som blir mer och mer digitaliserad. Där tidigare forskning fokuserat på att undersöka hur GDPR förändrade befintliga organisationer och system, eller hur GDPR påverkar enskilda praktiker, ämnar denna studie att ge ett helhetsperspektiv på hur GDPR påverkar arbetet med informationssäkerhet. Studien har uppnått detta genom semistrukturerade intervjuer med personer som är aktiva inom området, som sedan har analyserats tematiskt och kontextualiserat med hjälp av TOE-ramverket. Resultatet visar på att GDPR påverkar informationssäkerhetsarbetet genom att det: kan ha en negativ påverkan på tekniska informationssäkerhetslösningar; kan skapa intressekonflikter vid kravhantering i relation till informationssäkerhetsarbetet; påverkar informationssäkerhetsarbetet genom att det blir en viktig del av organisationers övergripande strategi mot kunder; är ett hinder för små företag medan större företag kan nyttja det som en vägledning i deras informationssäkerhetsarbete. Resultat bidrar med konkreta exempel på hur GDPR påverkar arbetet med informationssäkerhet och lärdomar som kan dras för hur symbiosen mellan GDPR och informationssäkerhet kan förbättras och inom vilka aspekter.Information security is a central component of IT-security efforts and is aimed at maintaining the confidentiality, integrity, and availability of information. GDPR is the primary regulatory framework governing information security for organizations within the EU. However, complying with the legal requirements presented by the GDPR is becoming increasingly complex, while the need for adequate information security is becoming ever more relevant in a rapidly digitalizing world. Where previous research has focused on examining how the GDPR has transformed existing organizations and systems, or how GDPR affects individual practices, this study aims to provide a holistic perspective on how GDPR influences information security work. The study has achieved this through semi-structured interviews with professionals active in the field, which have been thematically analyzed and contextualized using the TOE framework. The results show that GDPR impacts information security efforts in the following ways: it can have a negative impact on technical information security solutions; it can create conflicts of interest during requirements management in relation to information security work; it influences information security by becoming a strategic component in organizations' customer-facing strategies; it acts as a barrier for small companies, while larger companies can utilize it as a guiding framework in their information security efforts. The findings provide concrete examples of how the GDPR affects information security work and offer insights into how the synergy between GDPR and information security can be improved, and in which aspects
Batterienergilager som flexibel resurs i elnät : Potential, ekonomiska beräkningar och praktiska utmaningar i jämförelse med nätutbyggnad vid kapacitetsbrist
No full textThis thesis explores the potential, implementation, limitations, and benefits of using flexible resources, specifically battery energy storage systems, as an alternative to traditional grid reinforcements during peak load hours, from the perspective of a distribution system operator (DSO), Ellevio. The study examines real-world cases and operational data from Ellevio to assess whether flexibility could serve as an alternative to costly and long-term grid reinforcements during limited peak load conditions. The analysis also includes one case where BESS is used to avoid increasing the upstream network subscription limit and the associated overcapacity charges. The potential of limited peak-shaving through demand response is also considered as a complementary strategy. The study assesses the economic viability of flexibility compared to grid investments within the current regulatory framework (RP4), while also discussing upcoming changes under regulatory period 5 that may influence future decisionmaking. Special attention is given to the dimensioning of the flexible resource, implementation challenges, and a comparative cost analysis over time. Due to regulatory frameworks, it is not economically viable for DSOs to own batteries for this purpose. Therefore, flexibility must be purchased through third-party contracts. The study also examines market prerequisites for flexibility services and the conditions necessary for future market development. Furthermore, flexibility is investigated as a transitional solution during the lead time for planned grid reinforcements. The study applies a mixed-method approach. A literature review is combined with qualitative insights from interviews with representatives from Ellevio and the battery supplier Energy Solutions. In addition, a quantitative model was developed and implemented using NetBas, Python, and Excel to evaluate technical and economic outcomes under various scenarios. The findings indicate that flexibility, when used as a bridge solution, can improve overall cost-efficiency for DSOs while enabling faster connection of new customers, thereby increasing customer satisfaction. However, to enable the use of flexibility as a permanent solution, further developments are required both within the regulatory framework and in internal DSO processes. Such solutions are most viable when overload situations occur during a small number of short peak load events, rather than extended periods of high energy demand. Under the current regulatory framework, traditional grid reinforcements are economically favorable for DSOs regardless of cost. However, upcoming changes in the next regulatory period are expected to incentivize alternative solutions that enhance overall economic efficiency, particularly through improved network utilization.
Moisture-related problems in roof structures with cold attics and retrofitted insulation : A case study on historic buildings and sustainable solutions
No full textOld buildings with unheated, naturally ventilated experiences moisture-related problems to a greater extent, especially those with cultural historical value that do not meet modern moisture safety standards. These buildings require solutions that preserve architectural features, including roof construction. This thesis proposes optimized roof and attic floor constructions for such buildings, focusing on case study of an old Mission Church Kungsgatan 16 in Uppsala, Sweden, conducted in collaboration with MIAB Förvaltning. The study identifies two alternatives for the roof, evaluated for: moisture control using WUFI simulations and long-term sustainability, environmental and economic via lifecycle analyses A1 raw material supply to A5 construction-installation process, costs in “One click LCA”, while respecting the building’s cultural value. Alternative 1 (preserve) prioritizes retaining existing materials. Alternative 2 (new materials) aim to replicate the current exterior roof. WUFI results show that up to 30 % of the simulation period mold can develop in wood in the external roof structure without roofing felt compared to the corresponding number for a roof with roofing felt is 14 %. Alternative 1 (preserve) has a mean value of relative humidity (RH) of 55 % in wood fiber insulation while corresponding number for Alternative 2 (new materials) is 47 % (mineral wool). Neither exceeds the critical 75 % RH threshold after the first month, indicating low mold risk. From a sustainability perspective, Alternative 1 (preserve) has an environment impact as global warming potential (GWP) of 558 kg CO2e and a cost of living 212 140 SEK compared to Alternative 2 (new materials) 6 424 kg CO2e and 331 041 SEK. Conclusion: Alternative 1 (preserve) is the most sustainable option from both the environmental and economic perspective. Alternative 2 (new materials) prioritizes long-term moisture safety
Development and Implementation of a Shadow Loss Model to Improve the Accuracy of Hourly Simulated Photovoltaic Power Generation
No full textIn regions with a high share of decentralised Photovoltaic (PV) systems, shading-related generation losses can significantly impact power forecasts and grid planning. While centralised systems are less affected, a shadow loss model is essential for accurately estimating PV electricity output, particularly in distributed networks. This thesis presents the development and implementation of a shadow loss model aimed at improving the accuracy of hourly PV power simulations. The model was evaluated using 40 reference systems located across Sweden, primarily in the southern half. Each system included known parameters such as module specifications, tilt, azimuth, and measured generation data from 2017 to 2024. Simulations were first run without the shadow model and then repeated with it, incorporating surrounding LiDAR data to generate a shadow map and calculate system-specific shading effects. Model performance was assessed using Becquerel Sweden’s Skill score-method, which compares the coefficient of determination (R2), root-mean squared error (RMSE), and mean absolute error (MAE) between baseline and shadow-adjusted simulations. Results showed improvements of up to 9.6% in R2Skill score, 29.5% in RMSESkill score, and 24.4% in MAESkill score. A majority of the systems (36 out of 40) showed some improvement, with 18 exhibiting substantial gains. Only two systems experienced notable regressions, primarily in RMSE and MAE. These results confirm the model’s effectiveness in reducing overestimation and enhancing simulation accuracy, especially for systems subject to partial or heavy shading.
Investigation of Contiguity with SEM-EBSD : Contiguity with the MTEX Script TrueEBSD
No full textThe contiguity was investigated through TrueEBSD, a script that reassigns Co (Cobalt) to correct for the lower signal intensity Co has compared to WC (Tungsten Carbide) in EBSD (electron backscattering diffraction). It was compared to different parameters measured in earlier studies and the contiguity was related to the different alloying materials added. The script was then overall evaluated since this is one of the first times it is used. The evaluation of the script showed that the technique was robust due to the large amount of data getting collected and analysed. The linear analysis showed that gave the closest contiguity compared to the TrueEBSD script. However, the script adds too much binder phase, in 7 out of 11 samples the binder phase volume was closer to the theoretical binder phase volume before the reassignment of Co. This leads to a lower contiguity than expected, a significant decrease in contiguity was seen by the reassignment for all samples. Mean contiguity can be calculated in two different ways, grain boundary weighed or weighted against number of grains. Both ways gave the same trend in contiguity. After the reassignment no correlation could be detected with any of the alloying elements. It could be seen that the contiguity was positively correlated with hardness and inversely correlated to toughness and grain size. The contiguity was also tested for magnification dependence but did not show any.
Nuclear Energy and Social Media : Frames, narratives, and public engagement in the online nuclear energy debate
No full textThis master’s thesis is motivated by the recent, steady rise in public support for nuclear energy in Sweden. To explore this phenomenon, the study examines political communication about nuclear energy on Facebook over recent years of increased public support. It bridges the supply (the political actor) and demand (the recipient of political communication) perspective on political communication. Thus, the thesis not only addresses how political actors communicate about nuclear energy, but also how the communication is received and whether it resonates with the Swedish public. The project follows a mixed-methods research design, integrating both quantitative and qualitative approaches to provide a comprehensive analysis. Datasets utilized in this project, have been collected from two Meta libraries. A qualitative content analysis based on the theoretical concept of frames, was conducted to describe how political actors communicate regarding nuclear energy on Facebook. The quantitative components of the thesis include several negative binomial regression models for dependent variables corresponding to different types of engagement (reactions, comments, likes) on Facebook. The results from the qualitative analysis indicate the presence of certain nationalistic tendencies in the debate on nuclear energy. The qualitative results furthermore indicate some similarities between the new climate change denial discourse and recurring narratives on nuclear energy in a Swedish context. The quantitative findings suggest that right-wing political actors are more actively engaging in the nuclear energy debate on Facebook. Posts made by right-wing actors constitute approximately 75% of the dataset. From the regression analysis, a consistent pattern emerged across all regression models: posts published by individual politicians, rather than official party pages, received more engagement of all kinds. The ideological affiliation of the source behind a post affected the engagement in most regression models. Regarding the content of a post, the regression models indicated that certain frames affected the level of received engagement.
Tillgänglighet i religionskunskapsläroböcker : En kvalitativ textanalys av vilket innehåll som riskerar att orsaka kognitiv överbelastning för elever med adhd
No full textDenna studie syftar till att analysera hur tillgängliga olika läroböcker i religionskunskap för årskurs 4-6 är för elever med adhd. Detta görs då läroböcker har en central roll i undervisningen men samtidigt kan brista i tillgänglighet. För elever med adhd, som ofta har nedsatt arbetsminne, kan detta försvåra förmågan att bearbeta information. Studiens syfte uppfylls genom att identifiera vilket innehåll som riskerar att orsaka kognitiv överbelastning för elever med adhd samt på vilket sätt tillgängligheten i läroböcker i religionskunskap kan brista. Läroböcker i religionskunskap väljs då det är ett ämne som kan uppfattas abstrakt för elever. Kapitlen som behandlar kristendom analyseras i fyra olika läroböcker. Valet av att analysera kapitlen om kristendom grundas i behovet av avgränsning samt då det är ett kapitel som finns i samtliga läroböcker. En kvalitativ textanalys görs med utgångspunkt i kognitiv belastningsteori och universell design för lärande. Kognitiv belastningsteori fokuserar på hur arbetsminnets resurser kan utnyttjas på ett sätt som främjar lärande. Universell design för lärande syftar till att skapa en inkluderande och tillgänglig undervisning för alla elever, oavsett funktionsnedsättningar. Ett ramverk för att identifiera extraneous kognitiv belastning, som baseras på kognitiv belastningsteori, används som analysverktyg. Ramverket syftar till att främja lärandeprocessen genom att fungera som ett verktyg för att identifiera innehåll som orsakar extraneous kognitiv belastning och som i sin tur kan bidra till kognitiv överbelastning. Resultaten visar att alla områden av ramverket går att identifiera i samtliga religionskunskapsläroböcker, även om det förekommer i varierande omfattning i respektive lärobok. Det finns därmed innehåll i läroböckerna som riskerar att orsaka kognitiv överbelastning för elever med adhd. Dessa inslag bidrar till en bristande tillgänglighet i läroböckerna, då de inte är utformade med hänsyn till de kognitiva behov som elever med adhd har. Likt denna studie använder tidigare forskning ramverket för att identifiera extraneous kognitiv belastning och kommer fram till att läroböcker brister utifrån dessa områden. Ytterligare tidigare forskning belyser betydelsen av hur information presenteras i undervisningsmaterial och indikerar att det finns brister för elever med adhd. Det saknas dock forskning specifikt om hur väl läroböcker i religionskunskap är tillgängliga för elever med adhd, vilket därmed är fokuset i denna undersökning