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  • 451.
    Airey, John
    et al.
    University of Kalmar, School of Human Sciences.
    Linder, Cedric
    Looking for Links between Learning and the Discursive Practices of University Science2005In: 11th EARLI biennial conference, University of Cyprus, Nicosia, 2005Conference paper (Refereed)
  • 452.
    Airey, John
    et al.
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages. Uppsala University.
    Linder, Cedric
    Uppsala University, Sweden.
    Social semiotics in university physics education: Leveraging critical constellations of disciplinary representations2015In: Science Education Research: Engaging learners for a sustainable future / [ed] Jari Lavonen, Kalle Juuti, Jarkko Lampiselkä, Anna Uitto, Kaisa Hahl, European Science Education Research Association , 2015Conference paper (Refereed)
    Abstract [en]

    Social semiotics is a broad construct where all communication is viewed as being realized through signs and their signification. In physics education we usually refer to these signs as disciplinary representations. These disciplinary representations are the semiotic resources used in physics communication, such as written and oral languages, diagrams, graphs, mathematics, apparatus and simulations. This alternative depiction of representations is used to build theory with respect to the construction and sharing of disciplinary knowledge in the teaching and learning of university physics. Based on empirical studies of physics students cooperating to explain the refraction of light, a number of theoretical constructs were developed. In this presentation we describe these constructs and examine their usefulness for problematizing teaching and learning in university physics. The theoretical constructs are: fluency in semiotic resources, disciplinary affordance and critical constellations.

    The conclusion formulates a proposal that has these constructs provide university physics teachers with a new set of meaningfully and practical tools, which will enable them to re-conceptualize their practice in ways that have the distinct potential to optimally enhance student learning.

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  • 453.
    Airey, John
    et al.
    Stockholm University, Sweden.
    Patron, Emelie
    Linnaeus University, Faculty of Social Sciences, Department of Education and Teacher's Practice. Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Wikman, Susanne
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Making the Invisible Visible: The role of undergraduate textbooks in the teaching and learning of physics and chemistry2023In: Designing futures: The 11th International Conference on Multimodality; Book of abstracts, London Conference, London: UCL , 2023Conference paper (Refereed)
    Abstract [en]

    As disciplines, undergraduate physics and chemistry leverage a particularly wide range of semiotic systems (modes) in order to create and communicate their scientific meanings. Examples of the different semiotic systems employed are: spoken and written language, mathematics, chemical formulae, graphs, diagrams, sketches, computer simulations, hands-on work with experimental apparatus, computer simulations, etc. Individual semiotic resources within this range of semiotic systems are coordinated in specific constellations (Airey & Linder, 2009) in order to mediate scientific knowledge. In this Swedish Research Council project, we are interested in the representation of scientific phenomena that cannot be seen. The question we pose is: How is scientific knowledge mediated when we cannot directly interact with the phenomena in question through our senses?  We adopt a social semiotic approach (Airey & Linder, 2017; van Leeuwen, 2005), to investigate the ways in which two phenomena—electromagnetic fields and chemical bonds—are presented in undergraduate textbooks. To do this we carried out a semiotic audit (Airey & Erikson, 2019) of eight textbooks (four in each discipline). We note that the individual resources used have a mixture of affordances—whilst the majority retain high disciplinary affordance, others are unpacked (Patron et al. 2021) providing higher pedagogical affordance. We discuss the ways in which the resources have been combined and orchestrated (Bezemer & Jewitt, 2010) in order to attempt to make visible that which is invisible, and identify a number of potential problems. In earlier work, Volkwyn et al. (2019) demonstrated how experimental work with physics devices can make the Earth’s magnetic field accessible to students through chains of transduction. Thus, we propose that encouraging transductions across the semiotic resource systems provided in textbooks may help students to experience the invisible.

    References

    Airey, J. (2006). Physics students' experiences of the disciplinary discourse encountered in lectures in English and Swedish (Licentiate dissertation, Department of Physics, Uppsala University).

    Airey, J. (2009). Science, language, and literacy: Case studies of learning in Swedish university physics (Doctoral dissertation, Acta Universitatis Upsaliensis).

    Airey, J. (2015). Social Semiotics in Higher Education: Examples from teaching and learning in undergraduate physics. In In: SACF Singapore-Sweden Excellence Seminars, Swedish Foundation for International Cooperation in Research in   Higher Education (STINT) , 2015 (pp. 103). 

    Airey, J., & Eriksson, U. (2019). Unpacking the Hertzsprung-Russell diagram: A social semiotic analysis of the disciplinary and pedagogical affordances of a central resource in astronomy. Designs for Learning, 11(1), 99-107.

    Goodwin, C. (2015). Professional vision. In Aufmerksamkeit: Geschichte-Theorie-Empirie (pp. 387-425). Wiesbaden: Springer Fachmedien Wiesbaden.

    O’Halloran, K. (2007). Mathematical and scientific forms of knowledge: A systemic functional multimodal grammatical approach. language, Knowledge and pedagogy: functional linguistic and sociological perspective, 205-236.

    Patron, E. (2022). Exploring the role that visual representations play when teaching and learning chemical bonding: An approach built on social semiotics and phenomenography(Doctoral dissertation, Linnaeus University Press).

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  • 454.
    Airey, John
    et al.
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages. Uppsala University.
    Urban, Eriksson
    Uppsala University ; Kristianstad University.
    A Semiotic Analysis of the Disciplinary Affordances of the Hertzsprung-Russell Diagram in Astronomy2014In: The 5th International 360 Conference, Encompassing the multimodality of knowledge, May 8-10 2014, Aarhus University, Denmark, Aarhus: Aarhus University , 2014, p. 22-Conference paper (Refereed)
    Abstract [en]

    One of the central characteristics of disciplines is that they create their own particular ways of knowing the world through their discourse (Airey & Linder 2009). This process is facilitated by the specialization and refinement of disciplinary-specific semiotic resources over time. Nowhere is this truer than in the sciences, where it is the norm that disciplinary-specific representations have been introduced and then refined by a number of different actors (Airey 2009). As a consequence, many of the semiotic resources used in the sciences today still retain some traces of their historical roots. This makes the aquisition of disciplinary literacy (Airey, 2013) particularly problematic (see Eriksson et al. 2014 for an example from astronomy).

     In this paper we analyse one such disciplinary-specific semiotic resource from the field of Astronomy—the Hertzsprung-Russell diagram. We audit the potential of this semiotic resource to provide access to disciplinary knowledge—what Fredlund et al (2012) have termed its disciplinary affordances. Our analysis includes consideration of the use of scales, labels, symbols, sizes and colour. We show how, for historical reasons, the use of these aspects in the resource may differ from what might be expected by a newcomer to the discipline.

    We suggest that some of the issues we highlight in our analysis may, in fact, be contributors to alternative conceptions and therefore propose that lecturers pay particular attention to the disambiguation of these features for their students.

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  • 455.
    Ajvazaj, Albina
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Påverkande faktorer på internkommunikation: En fallstudie på en offentlig verksamhet2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 456.
    Akbarzadeh, Saeed
    et al.
    Fudan Univ, China.
    Ghayvat, Hemant
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Chen, Chen
    Fudan Univ, China.
    Zhao, Xian
    Fudan Univ, China.
    Hosier, Stephanie
    SUNY Binghamton, USA.
    Yuan, Wei
    Chinese Acad Sci, China.
    Pun, Sio Hang
    Univ Macau, China.
    Chen, Wei
    Fudan Univ, China.
    A Simple Fabrication, Low Noise, Capacitive Tactile Sensor for Use in Inexpensive and Smart Healthcare Systems2022In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 22, no 9, p. 9069-9077Article in journal (Refereed)
    Abstract [en]

    Tactile sensors are among the most important devices used in industrial and biomedical fields. Sensors' profiles are significantly affected by their structures and material used. This article presents a robust, low-cost, low noise, accurate and simple fabrication capacitive tactile sensor as a single taxel fabricated on foam. This highly scalable design provides excellent noise immunity, accuracy, and due to a unique printable elastic conductor, it is flexible and stretchable with more than 200% strain. Furthermore, the taxel is based on the capacitive Wheatstone bridge. As a result, noise immunity and stability in case of temperature fluctuation is accomplished. Additionally, the sensor's innovative, simple fabrication, made of Polyurethane foam and printable elastic conductor, allows the system to adapt and achieve relevant results necessary for the purpose of the sensor's application. Therefore, the proposed sensor has potential applications in industrial and biomedical contexts, such as sleep monitoring, etc.

  • 457.
    Akermark, Adam
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Svensson, Martin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Piratkopiering - en oändlig historia?2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract (English)

    Background: Illegal copying increases rapidly. Software-, game- and music industry are experiencing troubled times at the moment. Today, a practically ignorant person would have no problems to get hold of a newly published record before it reaches the stores because of the

    illegal copying. This problem is made possible due to that no good solution exists. Copy protection isn’t good enough and peer-to-peer-networks are bigger than ever. In this work we will examine specifically the music industry.

    Purpose: We will specialize in the term of illegal copying. Further we want to enlight and inform the music industry as well as the users of the problem and it´s future. We hope the result we will achieve can be a foundation for further research.

    Realization: We have gathered our information from articles on the Internet and also from updated literature. Interviews were made over the phone with Magnus Mårtensson, IFPI (International Federation of the Phonographic Industry), Anna Burén, lawyer of copyright at

    Swedish Radio, Per Sandin, General manager EMI marketing and also a lot of Internetsuppliers. We have also compilated an inquiry which has been replied to by many people.

    Conclusion: Many of the buyers from the past consider the cost of a CD far too high. Instead they have discovered the illegal copying and its unlimited functions. They have also realized how easy you can get new music without reprisals, which mostly depends on the vague and

    not to scary laws. Music companies are losing money and therefore they raise the prize of a single CD, simultaneously as they work to find the perfect copy protection. The future looks uncertain and for the moment, those who are copying along with peer-to-peer-networks have

    all the trumps.

    Keywords: mp3, CD, copy-protection, peer-to-peer-networks, copyright, illegal copying, music companies.

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  • 458.
    Akhshik, Arash
    et al.
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics. Jagiellonian Univ, Poland.
    Tusznio, A.
    Jagiellonian Univ, Poland.
    Strzelecka, Marianna
    Linnaeus University, School of Business and Economics, Department of Organisation and Entrepreneurship. Jagiellonian Univ, Poland.
    Equifinal paths to megafauna conservation through memorable wildlife tourism experiences: evidence from the restitution of the European bison (Bison bonasus) in Poland2023In: Current Issues in Tourism, ISSN 1368-3500, E-ISSN 1747-7603, Vol. 26, no 18, p. 3064-3084Article in journal (Refereed)
    Abstract [en]

    Despite a vast literature conceptualizing a memorable tourism experience, empirical studies overlook the context in which those experiences are produced and compiled into actions that benefit the environment. Accordingly, we need to better understand to what extent the experience of megafauna enclosures strengthens visitors' overall support for wildlife protection. To close this knowledge gap, we study memorable tourism experiences in the Bison enclosures within Poland to better understand the significance of the environmental context in which the experience induces support for protecting the species. To this end, the study employs both symmetric and asymmetric models to uncover the complexity of individual behavioural paths. The PLS-SEM results confirm the role of memorable experiences in the relationship between attitudinal and behavioural outcomes. In a complimentary manner, the fsQCA results reveal how environmental planners can analyze complex constellations of internal and external factors to elucidate the conditions that generate visitor support for wildlife protection.

  • 459.
    Akhtar, Naeem
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Alzghoul, Ahmad
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Time performance comparison in determining the weak parts in wooden logs2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The steadily increasing demand of wood forces sawmills to increase the efficiency and effectiveness of their equipments. The weak parts and the twist in wooden logs have been documented as the most common and crucial defect in sawn lumber.

    In this thesis we are going to implement a program which is able to determine the weak parts in wooden logs. The implementation will be in two languages C++ and Matlab. Parts of the program are going to be implemented sometimes by C++ and sometimes by Matlab therefore different designs are going to be tested. The aim of this thesis is to check whether these designs will meet the real time bound of 10 m/s.

    The result shows that there is a huge difference in time performance for the different designs. Therefore, different discretization levels were used in order to meet the deadline of 10m/s. We found that in order to get better speed one should calculate the matrix for the function F and the Jacobian function J by using C++ not by Matlab. Also we found that when we called functions from one language to another an extra time is added.

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  • 460. Akimov, D.
    et al.
    Bergstrom, L.
    Bilger, R.
    Bogoslavsky, D.
    Bolozdynya, A.
    Bondar, A.
    Calen, H.
    Carius, Staffan
    Uppsala University.
    Clement, H.
    Chernyshev, B.
    Chilingarov, A.
    Chuvilo, I.
    Dahlgren, S.
    Dunin, V.
    Ekstrom, Curt
    Fransson, K.
    Gornov, M.
    Gurov, Yu
    Gustafsson, L.
    Hirabyashi, H.
    Haggstrom, S.
    Hoistad, B.
    Ikegami, H.
    Jansson, A.
    Johansson, A.
    Kilian, K.
    Kolachev, G.
    Komogorova, L.
    Kondratyuk, L.
    Kullander, S.
    Kupsc, A.
    Kuzmin, A.
    Kuznetsov, A.
    Martemyanev, A.
    Mizuno, Y.
    Morosov, B.
    Mohn, J.
    Mortsell, A.
    Nawrot, A.
    Oelert, W.
    Pawlowski, Z.
    Povtoreiko, A.
    Purlatz, T.
    Reistad, D.
    Ruber, R.
    Rubinstein, H.
    Sandukovsky, S.
    Schuberth, U.
    Sefzick, T.
    Shafigullin, M.
    Shimizu, H.
    Shwartz, B.
    Sibirtsev, A.
    Sidrov, V.
    Sopov, V.
    Stepanaik, J.
    Sukhanov, A.
    Sukhanov, A.
    Chernyshev, V.
    Tikhomirov, V.
    Turowiecky, A.
    Trostell, B.
    Waters, M.
    Wilhelmi, Z.
    Yamamoto, A.
    Zabierowski, J.
    Zernov, A.
    Zlomanczuk, J.
    Physics with WASA and PROMICE1994In: Physics with GeV-particle beams, Juelich 1994, 1994, p. 519-530Conference paper (Refereed)
  • 461.
    Akintola, Abayomi Rasheed
    Linnaeus University, Faculty of Technology, Department of Informatics.
    User Adoption of Big Data Analyticsin the Public Sector2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of this thesis was to investigate the factors that influence the adoption of big data analytics by public sector employees based on the adapted Unified Theory of Acceptance and Use of Technology (UTAUT) model. A mixed method of survey and interviews were used to collect data from employees of a Canadian provincial government ministry. The results show that performance expectancy and facilitating conditions have significant positive effects on the adoption intention of big data analytics, while effort expectancy has a significant negative effect on the adoption intention of big data analytics. The result shows that social influence does not have a significant effect on adoption intention. In terms of moderating variables, the results show that gender moderates the effects of effort expectancy, social influence and facilitating condition; data experience moderates the effects of performance expectancy, effort expectancy and facilitating condition; and leadership moderates the effect of social influence. The moderation effects of age on performance expectancy, effort expectancy is significant for only employees in the 40 to 49 age group while the moderation effects of age on social influence is significant for employees that are 40 years and more. Based on the results, implications for public sector organizations planning to implement big data analytics were discussed and suggestions for further research were made. This research contributes to existing studies on the user adoption of big data analytics. 

  • 462.
    Akiskali, Turkan
    et al.
    Akdeniz University, Türkiye.
    Kitapci, Olgun
    Akdeniz University, Türkiye.
    Ozturkcan, Selcen
    Linnaeus University, School of Business and Economics, Department of Marketing.
    Dataset - Literature on service robots in the hospitality industry2022Data set
  • 463.
    Akkaya, Deniz
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Thalgott, Fabien
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Honeypots in network security2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Day by day, more and more people are using internet all over the world. It is becoming apart of everyone’s life. People are checking their e-mails, surfing over internet, purchasinggoods, playing online games, paying bills on the internet etc. However, while performingall these things, how many people know about security? Do they know the risk of beingattacked, infecting by malicious software? Even some of the malicious software arespreading over network to create more threats by users. How many users are aware of thattheir computer may be used as zombie computers to target other victim systems? Astechnology is growing rapidly, newer attacks are appearing. Security is a key point to getover all these problems. In this thesis, we will make a real life scenario, using honeypots.Honeypot is a well designed system that attracts hackers into it. By luring the hackerinto the system, it is possible to monitor the processes that are started and running on thesystem by hacker. In other words, honeypot is a trap machine which looks like a realsystem in order to attract the attacker. The aim of the honeypot is analyzing, understanding,watching and tracking hacker’s behaviours in order to create more secure systems.Honeypot is great way to improve network security administrators’ knowledge and learnhow to get information from a victim system using forensic tools. Honeypot is also veryuseful for future threats to keep track of new technology attacks.

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  • 464.
    Akram, Neelam
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    From genes to ecological function in marine bacteria2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Bacteria in the sea are constantly exposed to environmental challenges (e.g. variations in nutrient concentrations, temperature and light conditions), and therefore appropriate gene expression response strategies to cope with them efficiently are evolved. This thesis investigates some interconnected questions regarding such adaptive strategies employed by marine bacteria.

    The recently discovered ability of bacteria to use the membrane protein proteorhodopsin (PR) to harvest light energy for cell metabolism were investigated in Vibrio sp. AND4 and Dokdonia sp. MED134. PR phototrophy in AND4 promoted survival during starvation, the molecular basis for which were the upregulation of the PR gene by nutrient limitation rather than light. MED134, in contrast, uses PR phototrophy to grow better, and we discovered that the light-stimulated growth was stronger in seawater with the single carbon compound alanine compared to a mixture of complex organic matter. Thus, differences between bacteria in PR gene expression regulation in response to light, nutrients or organic matter quality critically determine the ecological role of PR phototrophy in the sea.

    Current observations that membrane transporters (including PR) are highly expressed in seawater inspired a comparative analysis of transporter distributions in marine bacteria. Totally, 192 transporter families were found in 290 genome-sequenced strains. Consistent differences, but also similarities, in the number of transporters were found between major bacterial groups. Interestingly, sodium transporters were found to be more abundant in PR-containing SAR11. These findings suggest that bacteria have inherently distinctive potentials to adapt to resource variations in the sea.

    To examine links between transcriptional responses and growth of bacteria under controlled environmental settings, a mesocosm phytoplankton bloom experiment was performed. Transcriptional analysis of the microbial community (i.e. metatranscriptomics) revealed 2800 categories of functional genes (SEED functions), of which around 10% were overrepresented in either the bloom mesocosms or the controls. Importantly, these functions indicated potential metabolic mechanisms (e.g. TonB mediated nutrient transport) by which bacteria took advantage of the bloom conditions.

    This thesis combines analyses of model organisms with community analysis and highlights the possibilities to identify important mechanisms that underlie the ecological success of different bacteria in the marine environment. 

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  • 465.
    Akram, Neelam
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Palovaara, Joakim
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Forsberg, Jeremy
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Lindh, Markus V.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Milton, Debra L.
    Luo, Haiwei
    Gonzalez, Jose M.
    Pinhassi, Jarone
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Regulation of proteorhodopsin gene expression by nutrient limitation in the marine bacterium Vibrio sp AND42013In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 15, no 5, p. 1400-1415Article in journal (Refereed)
    Abstract [en]

    Proteorhodopsin (PR), a ubiquitous membrane photoprotein in marine environments, acts as a light-driven proton pump and can provide energy for bacterial cellular metabolism. However, knowledge of factors that regulate PR gene expression in different bacteria remains strongly limited. Here, experiments with Vibrio sp. AND4 showed that PR phototrophy promoted survival only in cells from stationary phase and not in actively growing cells. PR gene expression was tightly regulated, with very low values in exponential phase, a pronounced peak at the exponential/stationary phase intersection, and a marked decline in stationary phase. Thus, PR gene expression at the entry into stationary phase preceded, and could therefore largely explain, the stationary phase light-induced survival response in AND4. Further experiments revealed nutrient limitation, not light exposure, regulated this differential PR expression. Screening of available marine vibrios showed that the PR gene, and thus the potential for PR phototrophy, is found in at least three different clusters in the genus Vibrio. In an ecological context, our findings suggest that some PR-containing bacteria adapted to the exploitation of nutrient-rich micro-environments rely on a phase of relatively slowly declining resources to mount a cellular response preparing them for adverse conditions dispersed in the water column.

  • 466.
    Al Allaf, Abdulrahman
    et al.
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Totonji, Waseem
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Exploring IoT Security Threats and Forensic Challenges: A LiteratureReview and Survey Study2023Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things (IoT) devices have increased rapidly in recent years, revolutionizing many industries, including healthcare, manufacturing, and transportation, and bringing benefits to both individuals and industries. However, this increase in IoT device usage has exposed IoT ecosystems to numerous security threats and digital forensic challenges. This thesis investigates the most common IoT security threats and attacks, students’ awareness of them and their mitigation strategies, and the key challenges associated with IoT forensic investigations. A mixed-method approach is adopted in this thesis combining a literature review and a survey study. The survey assesses students’ knowledge of IoT security threats, mitigation techniques, and perceptions of the most effective ways to enhance IoT security. The survey also emphasizes the importance of user training and awareness in mitigating IoT threats, highlighting the most effective strategies, such as stronger regulations and improved device security by manufacturers. The literature review provides a comprehensive overview of the most common IoT security threats and attacks, such as malware, malicious code injection, replay attacks, Man in the Middle (MITM), botnets, and Distributed Denial of Service Attacks (DDoS). The mitigation techniques to these threats are overviewed as well as real-world incidents and crimes, such as the Mirai botnet, St. Jude Medical implant cardiac devices hack, and the Verkada hack, are examined to understand the consequences of these attacks. Moreover, this work also highlights the definition and the process of digital and IoT forensics, the importance of IoT forensics, and different data sources in IoT ecosystems. The key challenges associated with IoT forensics and how they impact the effectiveness of digital investigations in the IoT ecosystem are examined in detail. Overall, the results of this work contribute to ongoing research to improve IoT device security, highlight the importance of increased awareness and user training, and address the challenges associated with IoT forensic investigations.

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    Degree project
  • 467.
    AL Jorani, Salam
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Performance assessment of Apache Spark applications2019Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    This thesis addresses the challenges of large software and data-intensive systems. We will discuss a Big Data software that consists of quite a bit of Linux configuration, some Scala coding and a set of frameworks that work together to achieve the smooth performance of the system. Moreover, the thesis focuses on the Apache Spark framework and the challenging of measuring the lazy evaluation of the transformation operations of Spark. Investigating the challenges are essential for the performance engineers to increase their ability to study how the system behaves and take decisions in early design iteration. Thus, we made some experiments and measurements to achieve this goal. In addition to that, and after analyzing the result we could create a formula that will be useful for the engineers to predict the performance of the system in production.

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  • 468.
    Alakangas, Linda J.
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. SKB, Äspo Hard Rock Lab, Oskarshamn.
    Mathurin, Frédéric A.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Faarinen, Mikko
    ALS Scandinavia AB Luleå.
    Wallin, Bill
    Geokema AB, Lidingö.
    Åström, Mats E.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Sampling and Characterizing Rare Earth Elements in Groundwater in Deep-Lying Fractures in Granitoids Under In Situ High-Pressure and Low-Redox Conditions2014In: Aquatic geochemistry, ISSN 1380-6165, E-ISSN 1573-1421, Vol. 20, no 4, p. 405-418Article in journal (Refereed)
    Abstract [en]

    Several countries are preparing to dispose of radioactive nuclear waste deep underground in crystalline rock. This type of bedrock is commonly extensively fractured and consequently carries groundwater that serves as a medium for transporting metals and radionuclides. A group of metals of particular interest in this context is the rare earth elements (REEs), because they are analogues of actinides contained within radioactive waste and are tracers of hydrological pathways and geochemical processes. Concentrations of REEs are commonly low in these groundwaters, leading to values below detection limits of standard monitoring methods, particularly for the heavy REEs. We present a new technical set-up for monitoring REEs (and other trace metals) in groundwater in fractured crystalline rock. The technique consists of passing the fracture groundwater, commonly under high pressure and containing reduced chemical species, through a device that maintains the physicochemical character of the groundwater. Within the device, diffusive gradient in thin-film (DGT) discs are installed in triplicate. With this set-up, we studied REEs in groundwater in fractures at depths of approximately -144, -280, and -450 m in granitoids in the A"spo Hard Rock Laboratory in southern Sweden. The entire REE suite was detected (concentrations down to 0.1 ng L-1) and was differently fractionated among the groundwaters. The shallowest groundwater, composed of dilute modern Baltic Sea water, was enriched in the heavy REEs, whereas the deeper groundwaters, dominated by old saline water, were depleted in the heavy REEs. Deployment periods varying from 1 to 4 weeks delivered similar REE concentrations, indicating stability and reproducibility of the experimental set-up. The study finds that 1 week of deployment may be enough. However, if the overall setting and construction allow for longer deployment times, 2-3 weeks will be optimal in terms of reaching reliable REE concentrations well above the detection limit while maintaining the performance of the DGT samplers.

  • 469.
    Alakangas, Linda J.
    et al.
    Swedish Nucl Fuel & Waste Management Co, Sweden.
    Mathurin, Frédéric A.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Bur Rech Geol & Minieres, France.
    Åström, Mats E.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Diverse fractionation patterns of Rare Earth Elements in deep fracture groundwater in the Baltic Shield - Progress from utilisation of Diffusive Gradients in Thin-films (DGT) at the Aspo Hard Rock Laboratory2020In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 269, p. 15-38Article in journal (Refereed)
    Abstract [en]

    Rare earth elements (REEs) were studied in groundwater in fractures at depths between 144 m and 450 m in Proterozoic granitoids on the Baltic Shield at a coastal site in south eastern Sweden (Aspo Hard Rock Laboratory). A specially designed device was used to sample the groundwater under in situ high pressure and low redox conditions. The REEs were measured via both diffusive gradients in thin-films (DGT) samplers after approximately three-week deployment times, and after conventional filtration (0.45 mu m membrane filters). The concentrations of REEDGT were lower than the REE0.45 mu m concentrations in all 14 studied groundwaters. This is explained by development of a diffuse boundary layer (DBL) in the solution at the DGTs caused by the low flow, and in some of the groundwaters additionally by the presence of organically complexed REE that diffuse slowly in the diffusive gel of the DGT. Among the 14 studied groundwaters there was a huge range in REEDGT-fractionation patterns, ranging from enrichment to a nearly three-order-of-magnitude depletion of the heavy REEs (HREEs), despite a relatively homogenous bedrock (granitoids). The HREE enrichment is explained by preservation of the fractionation signature as HREE enriched sea water intruded and flowed through the fractures, supported by the high proportion of modelled REE fulvic-acid complexes in these waters. The strong HREE depletion, which occurred in saline groundwater, was ascribed to an advanced REE equilibrium between the groundwater and primary and/or secondary minerals and the pore water in the bedrock. Yet other groundwaters had flat or moderately HREE depleted patterns, which in some cases may have been caused by mixing of small portions of surficial waters with saline groundwater. (C) 2019 Elsevier Ltd. All rights reserved.

  • 470.
    Alam, A. B. M. Sarowar
    et al.
    IUCN Bangladesh, Dhaka, Bangladesh..
    Ahmed, Sakib
    IUCN Bangladesh, Bangladesh.
    Azmiri, Kazi Zenifar
    IUCN Bangladesh, Bangladesh.
    Amin, Raquibul
    IUCN Bangladesh, Bangladesh.
    van Toor, Mariëlle L.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Datta, Ashis Kumar
    Jahangirnagar Univ, Bangladesh.
    Waldenström, Jonas
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Ul Haque, Enam
    Bangladesh Bird Club, Bangladesh.
    Chowdhury, Sayam U.
    Univ Cambridge, UK.
    Population trends and effects of local environmental factors on waterbirds at Tanguar Haor freshwater wetland complex in northeast Bangladesh2023In: Avian Conservation and Ecology, E-ISSN 1712-6568, Vol. 18, no 1, article id 18Article in journal (Refereed)
    Abstract [en]

    Analysis of long-term datasets on bird populations can be used to answer ecological and management questions that are useful for conservation. Tanguar Haor (9500 ha) is one of the major freshwater wetlands in Bangladesh and supports a large number of migratory and resident waterbirds. Because of its unique ecological and economic values, it is arguably the most notable wetland in the floodplains of northeast Bangladesh and in the region. This Ramsar site supports globally important populations of threatened waterbirds, such as the Baer's Pochard Aythya baeri, Common Pochard Aythya ferina, Falcated Duck Mareca falcata, Ferruginous Duck Aythya nyroca, Oriental Darter Anhinga melanogaster, and Black-tailed Godwit Limosa limosa. Considering the international significance of this site, knowledge gaps on waterbird population trends, and key ecological factors, we conducted waterbird census between 2008 and 2021 to identify priority sites for conservation, population trends of resident and migratory waterbirds, and environmental factors that influence their abundances. We recorded a total of 69 species of waterbirds (maximum count of 166,788 individuals in 2013) and assessed population trends of 47 species. Of these, peak counts of 15 species exceeded the 1% threshold of their Asian-Australian Flyway population estimates. Most species (59%) showed a declining trend, including the critically endangered Baer's Pochard and the vulnerable Common Pochard, and 16 species (41%) showed an increasing trend. Based on the abundance and species diversity, we have identified Chotainna beel and Lechuamara beel as conservation priority sites within the Haor complex and discuss key threats to these areas. We also offer evidence that adjusting water-level management to annual rainfall patterns could be a useful intervention for waterbird management. Involving local communities in conservation efforts by creating bird sanctuaries within the Haor complex will strengthen waterbird conservation in the country and along the East Asian-Australian Flyway.

  • 471.
    Alam Khan, Fakhri
    et al.
    University of Vienna.
    Han, Yuzhang
    University of Vienna.
    Pllana, Sabri
    University of Vienna.
    Brezany, Peter
    University of Vienna.
    An Ant-Colony-Optimization Based Approach for Determination of Parameter Significance of Scientific Workflows2010In: 24th IEEE International Conference on Advanced Information Networking and Applications, IEEE, 2010, p. 1241-1248Conference paper (Refereed)
    Abstract [en]

    In the process of a scientific experiment a workflow is executed multiple times using various values of the parameters of activities. For real-world workflows that may contain hundreds of activities, each having several parameters, it is practically not feasible to conduct a parameter sensitivity study by simply following a ”brute-force approach” (that is experimental evaluation of all possible cases). We believe that a heuristic-guided approach enables to find a near-optimal solution using a reasonable amount of resources without the need for the evaluation of all possibilities. In this paper we present a novel methodology for determination of parameter significance of scientific workflows that is based on Ant Colony Optimization (ACO). We refer to our methodology, which is a customization of ACO for Parameter Significance determination, as ACO4PS. We use ACO4PS to identify (1) which parameter strongly affects the overall result of the workflow and (2) for which combination of parameter values we obtain the expected result. ACO4PS generates a list of all workflow parameters sorted by significance as well as is capable of generating a subset of significant parameters. We empirically evaluate our methodology using a real-world scientific workflow that deals with the Non-Invasive Glucose Measurement.

  • 472.
    Alam Khan, Fakhri
    et al.
    University of Vienna.
    Han, Yuzhang
    University of Vienna.
    Pllana, Sabri
    University of Vienna.
    Brezany, Peter
    University of Vienna.
    Estimation of Parameters Sensitivity for Scientific Workflows2009In: 2009 International Conference on Parallel Processing Workshops, IEEE, 2009, p. 457-462Conference paper (Refereed)
    Abstract [en]

    Usually workflow activities in the scientific domain depend on a collection of parameters. These parameters determine the output of the activity, and consequently the output of the whole workflow. In the scientific domain, workflows have exploratory nature and are used to understand a scientific phenomenon or answer scientific questions. In the process of a scientific experiment a workflow is executed multiple times using various values of the parameters of activities. It is relevant to identify (1) which parameter strongly affects the overall result of the workflow and (2) for which combination of parameter values we obtain the expected result. Foreseeing these issues, in this paper we present our methodology to estimate the significance of all scientific workflow parameters as well as to estimate the most significant parameter to the workflow. The estimation of parameter significance will enable the scientist to fine tune, and optimize his results efficiently. Furthermore, we empirically validate our methodology on Non-Invasive Glucose Measurement workflow and discuss our results. The NIGM workflow uses the neural network model to calculate the glucose level in patient blood. The neural network model has a set of parameters, which affect the result of the workflow significantly. But, unfortunately the impact significance of these parameters is commonly unknown to the user. We present our approach for estimating and quantifying impact significance of neural network parameters.

  • 473.
    Alam Khan, Fakhri
    et al.
    University of Vienna.
    Han, Yuzhang
    University of Vienna.
    Pllana, Sabri
    University of Vienna.
    Brezany, Peter
    University of Vienna.
    Provenance Support for Grid-Enabled Scientific Workflows2008In: Fourth International Conference on Semantics, Knowledge and Grid, IEEE Computer Society, 2008, p. 173-180Conference paper (Refereed)
    Abstract [en]

    The Grid is evolving and new concepts like Semantic Grid, Knowledge Grid are rapidly emerging, where humans and distributed machines share, exchange, and manage data and resources intelligently. Computational scientists typically use workflows to describe and manage scientific discovery processes. However, the credibility of the obtained results in the scientific community is questionable if the computational experiment is not reproducible. This issue is being addressed in our research reported in this paper via development of workflow provenance system for Grid-enabled scientific workflows. Workflow provenance collects data on workflow activities, data flow and workflow clients. Provenance information can be used to trace and test workflows and the data produced. Our approach supports reproducibility (i.e. to support re-enactment of workflow by an independent user) and dataflow visualization (i.e. visualization of statistical characteristics of input/output data). We illustrate our approach on the Non-Invasive Glucose Measurement (NIGM) application.

  • 474. Alam, Moudud
    et al.
    Carling, Kenneth
    Dalarna University, Sweden.
    Chen, Rui
    Liang, Yuli
    Stockholm University, Sweden.
    How to determine the progression of young skiers?2008In: CHANCE: New Directions for Statistics and Computing, ISSN 0933-2480, Vol. 21, no 4, p. 13-19Article in journal (Refereed)
  • 475.
    Alatalo, Rauno V.
    et al.
    University of Jyväskylä, Finland.
    Eriksson, Dag
    Uppsala University, Sweden.
    Gustafsson, Lars
    Uppsala University, Sweden.
    Larsson, Kjell
    Uppsala University, Sweden.
    Exploitation competition influences the use of foraging sites by tits: Experimental evidence1987In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 68, no 2, p. 284-290Article in journal (Refereed)
    Abstract [en]

    In coniferous forests of central Sweden, tits (Paridae) and the Goldcrest, Regulus regulus, exploit nonrenewable resources in their group territories during winter. The smaller and socially subordinate species, the Goldcrest and the Coal Tit, Parus ater, forage on the outermost tree parts, while the larger and dominant Willow Tit, Parus montanus, and Crested Tit, Parus cristatus, forage on the inner tree parts. We removed Coal Tits and Goldcrests in three flocks in early winter to see if their absence would cause changes in the foraging patterns of the two dominant species. In late winter, Crested Tits foraged farther outward on branches of spruce in experimental flocks than they did in the control flocks. In spruce, Willow Tits foraged nearer the trunk than Crested Tits, and they did not respond to the experiment. In pine, Willow Tits, however, did move from branches to twigs in the absence of Coal Tits and Goldcrests. The experiment indicates that exploitation competition directly based on food depletion, without any interference, may influence the use of foraging sites by tits in coniferous forests.

  • 476.
    Albertson, Philip
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    WBD – Web Based Diagnostics: Identifierande av parametrar på CAN-bussen2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This abstract describes the bachelor degree thesis in computer technology at Växjö University written by Philip Albertson during the spring term of 2007. At the company BSR in Växjö, Sweden there is a new project under development called WBD – Web based diagnostics. The aim of the project is to make car diagnostics available to ordinary people at a decent cost. The system consists of three parts; a module to plug in the car, a server to handle the information and a client to allow the customers to reach the information about their car. My part in this project was to specify how to reach certain parameters on the CAN-bus in cars from VAG (Volkswagen Auto Group) and Saab. The company was satisfied with the results since they provided a good basis to further develop the module prototype built by the company EDAB (Elektronik Design AB) in Sundsvall, Sweden.

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    FULLTEXT01
  • 477.
    Albet-Torres, Nuria
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Gunnarsson, Anders
    Persson, Malin
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Balaz, Martina
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Höök, Fredrik
    Månsson, Alf
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Molecular motors on lipid bilayers and silicon dioxide: different driving forces for adsorption2010In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 6, no 14, p. 3211-3219Article in journal (Refereed)
    Abstract [en]

    Understanding how different types of interactions govern adsorption of the myosin motor fragment heavy meromyosin (HMM) onto different substrates is important in functional studies of actomyosin and for the development of motor powered lab-on-a-chip applications. In this study, we have combined in vitro motility assays and quartz crystal microbalance with dissipation (QCM-D) monitoring to investigate the underlying adsorption mechanisms of HMM onto supported lipid bilayers in comparison with pure and silanized SiO2. The QCM-D results, combined with data showing actin transportation by HMM adsorbed onto positively charged supported lipid bilayers, suggest reversible HMM surface adsorption via the negatively charged coiled-coil tail region. In contrast, the QCM-D data for HMM adsorption onto negatively charged lipids support a model according to which HMM adsorbs onto negatively charged surfaces largely via the positively charged actin binding regions. Adsorption studies at low (30-65 mM) and high (185-245 mM) ionic strengths onto piranha cleaned SiO2 surfaces (contact angle < 20 degrees) support this general model. However, unlike the situation for charged lipids, rinsing in high ionic strength solution caused only partial HMM desorption from SiO2, without restoration of actin propulsion by the remaining HMM molecules. This suggests that mechanisms other than electrostatic interactions are involved in the tethering of HMM heads to SiO2 surfaces. An expanded model for HMM adsorption is formulated on the basis of the data and the potential of the results for nanotechnological applications of actomyosin is discussed.

  • 478.
    Albet-Torres, Nuria
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Månsson, Alf
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Long-Term Storage of Surface-Adsorbed Protein Machines2011In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, no 11, p. 7108-7112Article in journal (Refereed)
    Abstract [en]

    The effective and simple long-term storage of complex functional proteins is critical in achieving commercially viable biosensors. This issue is particularly challenging in recently proposed types of nanobiosensors, where molecular-motor-driven transportation substitutes microfluidics and forms the basis for novel detection schemes. Importantly, therefore, we here describe that delicate heavy meromyosin (HMM)-based nanodevices (HMM motor fragments adsorbed to silanized surfaces and actin bound to HMM) fully maintain their function when stored at -20 degrees C for more than a month. The mechanisms for the excellent preservation of acto-HMM motor function upon repeated freeze thaw cycles are discussed. The results are important to the future commercial implementation of motor-based nanodevices and are of more general value to the long-term storage of any protein-based bionanodevice.

  • 479. Albeverio, S.
    et al.
    Cianci, R.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Operator calculus for p-adic valued symbols and quantization2009In: Rendicoti Del Seminario Matematico, ISSN 0373-1243, Vol. 67, no 2, p. 137-150Article in journal (Refereed)
    Abstract [en]

    The aim of this short review is to attract the attention of the pseudo-differentialcommunity to possibilities in the development of operator calculus for symbols (dependingon p-adic conjugate variables) taking values in fields of p-adic numbers. Essentials of thiscalculus were presented in works of the authors of this paper in order to perform p-adic valuedquantization. Unfortunately, this calculus still has not attracted a great deal of attentionfrom pure mathematicians, although it opens new and interesting domains for the theory ofpseudo-differential operators.

  • 480. Albeverio, S
    et al.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Shelkovich, M
    Nonlinear singular problems of $p$-adic analysis: associative algebras of $p$-adic distributions2005In: Izvestiya. Mathematics, ISSN 1064-5632, E-ISSN 1468-4810, Vol. 69, no 2, p. 221-263Article in journal (Refereed)
  • 481. Albeverio, S
    et al.
    Khrennikov, Andrei
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Shelkovich, V
    Theory of p-adic distributions: linear and nonlinear models2010Book (Refereed)
  • 482. Albeverio, S
    et al.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Shelkovich, V.M.
    p-adic Colombeau-Egorov type theory of generalized functions2005In: Mathematische Nachrichten, ISSN 0025-584X, E-ISSN 1522-2616, Vol. 278, no 1-2, p. 3-16Article in journal (Refereed)
  • 483. Albeverio, Sergio
    et al.
    Cianci, Roberto
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    p-Adic valued quantization2009In: P-Adic Numbers, Ultrametric Analysis, and Applications, ISSN 2070-0466, E-ISSN 2070-0474, Vol. 1, no 2, p. 91-104Article, review/survey (Refereed)
    Abstract [en]

    This review covers an important domain of p-adic mathematical physics — quantum mechanics with p-adic valued wave functions. We start with basic mathematical constructions of this quantum model: Hilbert spaces over quadratic extensions of the field of p-adic numbers ℚ p , operators — symmetric, unitary, isometric, one-parameter groups of unitary isometric operators, the p-adic version of Schrödinger’s quantization, representation of canonical commutation relations in Heisenberg andWeyl forms, spectral properties of the operator of p-adic coordinate.We also present postulates of p-adic valued quantization. Here observables as well as probabilities take values in ℚ p . A physical interpretation of p-adic quantities is provided through approximation by rational numbers.

  • 484. Albeverio, Sergio
    et al.
    Gundlach, Mathias
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Lindahl, Karl-Olof
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    On the Markovian Behavior of p-Adic Random Dynamical Systems2001In: Russ. J. Math. Phys., Vol. 8, no 2, p. 135-152Article in journal (Refereed)
  • 485. Albeverio, Sergio
    et al.
    Hilbert, Astrid
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Kolokoltsov, Vassili
    Warwick University, Department of Statistics.
    Estimates uniform in time for the transition probability ofdiusions with small drift and for stochastically perturbed Newton equations1999In: Journal of theoretical probability, ISSN 0894-9840, E-ISSN 1572-9230, Vol. 12, no 2, p. 293-300Article in journal (Refereed)
    Abstract [en]

    An estimate uniform in time for the transition probability of di®usion processes with small drift is given. This also covers the case of a degenerate di®usion describing a stochastic perturbation of a particle moving according to the Newton's law. Moreover the random wave operator for such a particle is described and the analogue of asymptotic completeness is proven, the latter in the case of a su±ciently small drift.

  • 486.
    Albeverio, Sergio
    et al.
    University of Bonn, Institute of Applied Mathematics.
    Hilbert, Astrid
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Kolokoltsov, Vassili
    University of Warwick, Department of Statistics.
    Uniform Asymptotic Bounds for the Heat Kernel and the Trace of a Stochastic Geodesic Flow2012In: Stochastics: An International Journal of Probablitiy and Stochastic Processes, ISSN 1744-2508, E-ISSN 1744-2516, Vol. 84, no 2-3, p. 315-333Article in journal (Refereed)
    Abstract [en]

    We analyze the asymptotic behaviour of the heat kernel dened by a stochastically perturbedgeodesic ow on the cotangent bundle of a Riemannian manifold for small time and smalldiusion parameter. This extends WKB-type methods to a particular case of a degenerateHamiltonian. We give uniform bounds for the solution of the degenerate Hamiltonian boundaryvalue problem for small time. The results are exploited to derive two sided estimates andmultiplicative asymptotics for the heat kernel semigroup and its trace.

  • 487.
    Albeverio, Sergio
    et al.
    Universityof Bonn, Germany.
    Hilbert, Astrid
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Kolokoltsov, Vassily
    University of Warwick, UK.
    Asymptotic Expansions for the Heat Kernel and the Trace of a Stochastic Geodesic Flow2009Manuscript (preprint) (Other academic)
  • 488. Albeverio, Sergio
    et al.
    Hilbert, Astrid
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Kolokoltsov, Vassily
    Transcience of stochastically perturbed classical Hamiltonian systems and random wave operators1997In: Stochastics and Stochastics Reports, ISSN 1045-1129, E-ISSN 1029-0346, no 1-2, p. 41-55Article in journal (Refereed)
  • 489. Albeverioa, S.
    et al.
    Khrennikov, Andrei
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Shelkovichg,, V.M.
    The Cauchy problems for evolutionary pseudo-differential equations over p-adic field and the wavelet theory2011In: Journal of Mathematical Analysis and Applications, ISSN 0022-247X, E-ISSN 1096-0813, Vol. 375, no 1, p. 82-98Article in journal (Refereed)
  • 490.
    Albinsson, Anneli
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Sundberg, Maria
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Wiktorsson, Veronika
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Matematik i förskolan: Om synsätt och arbetssätt efter kompetensutveckling2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med vårt arbete är att undersöka hur synsätt och arbetssätt kring matematik i förskolan förhåller sig i en kommun där det medvetet har satsats på kompetensutveckling i matematik. Vi vill veta vad matematik i förskolan innebär för lärarna och hur de arbetar med matematik samt hur de ser på kompetensutvecklingens betydelse.

    Som metod har vi använt oss av en kvantitativ metod i form av enkäter samt en kvalitativ metod i form av semistrukturerade intervjuer. Enkäterna har besvarats av lärare som deltagit i kompetensutvecklingen. Intervjuer har sedan genomförts med några av dessa samt med en rektor.

    Resultatet visar på att lärarna tycker att matematik hör hemma i förskolan. Förskolematematik innebär att synliggöra och lyfta fram matematiken i vardagliga situationer som är meningsfulla för barnen. Detta görs genom att utgå från barnens egna tankar och intressen. Enligt lärarna är det viktigt att sätta ord på matematiken och använda rätt begrepp samt att barnen lär sig under lekfulla former. Lärarna ser också sin egen roll som betydelsefull. I undersökningen framkommer att kompetensutvecklingen har haft stor betydelse för hur det arbetas med matematik i verksamheten.

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  • 491. Albrecht, Mario
    et al.
    Kerren, Andreas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Klein, Karsten
    Kohlbacher, Oliver
    Mutzel, Petra
    Paul, Wolfgang
    Schreiber, Falk
    Wybrow, Michael
    On Open Problems in Biological Network Visualization2009In: Graph Drawing: 17th International Symposium, GD 2009, Chicago, IL, USA, September 22-25, 2009. Revised Papers / [ed] David Eppstein and Emden R. Gansner, Berlin Heidelberg New York: Springer, 2009, p. 256-267Chapter in book (Refereed)
    Abstract [en]

    Much of the data generated and analyzed in the life sciences can be interpreted and represented by networks or graphs. Network analysis and visualization methods help in investigating them, and many universal as well as special-purpose tools and libraries are available for this task. However, the two fields of graph drawing and network biology are still largely disconnected. Hence, visualization of biological networks does typically not apply state-of-the-art graph drawing techniques, and graph drawing tools do not respect the drawing conventions of the life science community.

    In this paper, we analyze some of the major problems arising in biological network visualization.We characterize these problems and formulate a series of open graph drawing problems. These use cases illustrate the need for efficient algorithms to present, explore, evaluate, and compare biological network data. For each use case, problems are discussed and possible solutions suggested.

  • 492. Alder, V A
    et al.
    Cuzin-Roudy, J
    Fransz, G
    Granéli, Edna
    Department of Marine Ecology, University of Lund .
    Larsen, J
    Rabbani, M M
    Thomsen, H
    Macro- and micrograzing effects on phytoplankton communities1989In: The expedition Antarktis VII/3 (EPOS LEG 2) of RV "Polarstern" in 1988/89 / [ed] I. Hempel, P.H. Schalk and V. Smetacek, Bremerhaven: Alfred- Wegener-Institut für Polar Meeresforschung , 1989, p. 123-130Chapter in book (Other academic)
  • 493. Aldén, Anna
    et al.
    Persson, Anna
    Christensson, Kerstin
    Holmqvist, Olov
    Ohlson, Sten
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Porcine platelet lysate as a supplement for animal cell culture2007In: Cytotechnology (Dordrecht), ISSN 0920-9069, E-ISSN 1573-0778, Vol. 55, p. 3-8Article in journal (Refereed)
  • 494.
    Alegria Zufia, Javier
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Farnelid, Hanna
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Legrand, Catherine
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water. Halmstad University, Sweden.
    Seasonality of Coastal Picophytoplankton Growth, Nutrient Limitation, and Biomass Contribution2021In: Frontiers in Microbiology, E-ISSN 1664-302X, Vol. 12, article id 786590Article in journal (Refereed)
    Abstract [en]

    Picophytoplankton in the Baltic Sea includes the simplest unicellular cyanoprokaryotes (Synechococcus/Cyanobium) and photosynthetic picoeukaryotes (PPE). Picophytoplankton are thought to be a key component of the phytoplankton community, but their seasonal dynamics and relationships with nutrients and temperature are largely unknown. We monitored pico- and larger phytoplankton at a coastal site in Kalmar Sound (K-Station) weekly during 2018. Among the cyanoprokaryotes, phycoerythrin-rich picocyanobacteria (PE-rich) dominated in spring and summer while phycocyanin-rich picocyanobacteria (PC-rich) dominated during autumn. PE-rich and PC-rich abundances peaked during summer (1.1 x 10(5) and 2.0 x 10(5) cells mL(-1)) while PPE reached highest abundances in spring (1.1 x 10(5) cells mL(-1)). PPE was the main contributor to the total phytoplankton biomass (up to 73%). To assess nutrient limitation, bioassays with combinations of nitrogen (NO3 or NH4) and phosphorus additions were performed. PE-rich and PC-rich growth was mainly limited by nitrogen, with a preference for NH4 at >15 degrees C. The three groups had distinct seasonal dynamics and different temperature ranges: 10 degrees C and 17-19 degrees C for PE-rich, 13-16 degrees C for PC-rich and 11-15 degrees C for PPE. We conclude that picophytoplankton contribute significantly to the carbon cycle in the coastal Baltic Sea and underscore the importance of investigating populations to assess the consequences of the combination of high temperature and NH4 in a future climate.

  • 495.
    Alegria Zufia, Javier
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Legrand, Catherine
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water. Halmstad University, Sweden.
    Farnelid, Hanna
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Linnaeus University, Linnaeus Knowledge Environments, Water.
    Seasonal dynamics in picocyanobacterial abundance and clade composition at coastal and offshore stations in the Baltic Sea2022In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 14330Article in journal (Refereed)
    Abstract [en]

    Picocyanobacteria (< 2 mu m in diameter) are significant contributors to total phytoplankton biomass. Due to the high diversity within this group, their seasonal dynamics and relationship with environmental parameters, especially in brackish waters, are largely unknown. In this study, the abundance and community composition of phycoerythrin rich picocyanobacteria (PE-SYN) and phycocyanin rich picocyanobacteria (PC-SYN) were monitored at a coastal (K-station) and at an offshore station (LMO; similar to 10 km from land) in the Baltic Sea over three years (2018-2020). Cell abundances of picocyanobacteria correlated positively to temperature and negatively to nitrate (NO3) concentration. While PE-SYN abundance correlated to the presence of nitrogen fixers, PC-SYN abundance was linked to stratification/shallow waters. The picocyanobacterial targeted amplicon sequencing revealed an unprecedented diversity of 2169 picocyanobacterial amplicons sequence variants (ASVs). A unique assemblage of distinct picocyanobacterial clades across seasons was identified. Clade A/B dominated the picocyanobacterial community, except during summer when low NO3, high phosphate (PO4) concentrations and warm temperatures promoted S5.2 dominance. This study, providing multiyear data, links picocyanobacterial populations to environmental parameters. The difference in the response of the two functional groups and clades underscore the need for further high-resolution studies to understand their role in the ecosystem.

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  • 496.
    Alegria Zufía, Javier
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Picophytoplankton seasonal dynamics in the Baltic Sea2022Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Picophytoplankton (<2 μm diameter) is a diverse group of picocyanobacterial and photosynthetic picoeukaryotes (PPE).Picophytoplankton contribute significantly to total phytoplankton biomassand can dominate primary production in oceans, lakes and estuaries. In the estuarine Baltic Sea, the composition of picophytoplankton is linked to the north to south salinity gradient but knowledge of the seasonal dynamics interms of abundance, biomass and diversity is largely unknown. This thesis investigated the in situ dynamics, bottom up and top down controls of picocyanobacteria (SYN; consisting of primarily Synechococcus and Cyanobium among other genuses) and PPE at two sampling stations, one coastal and one offshore. Monitoring data over three years (2018-2020) showed high biomass contribution across all seasons. Picocyanobacterial peak abundances occurred from spring to summer at the coastal station and in late-summer to autumn at the offshore station (up to 4.7 × 105 cells mL-1).Differentiation of pigment populations showed that phycoerythrin rich(PE)-SYN was the main contributor to SYN abundances except at the coastalstation during summer, when PE-SYN and phycocyanin rich (PC)-SYN had equal contributions. PPE peak abundances occurred during late summer to autumn (up to 1.1 × 105 cells mL-1 cells ml-1). Temperature was linked topicophytoplankton growth and abundance, with PE-SYN, PCSYN and PPEadapted to different temperature ranges. Temperature also affected SYNnitrogen preference: SYN was nitrogen limited during early summer and at>15°C there was a preference for ammonium over nitrate. Clade A/B dominated the SYN community, except during summer at the coastal station when low nitrate and warm temperatures promoted S5.2 dominance. Grazing was observed to control SYN and PPE abundances and had an effect on the SYN community structure. Identification and laboratory experiments of key Synechococcus strains using a range of salinity, temperature and light conditions provided important insights into the physiological diversity of co-occurring ecotypes and links to the SYN dynamics that were observed in the field. In summary, this thesis provided novel information of picophytoplankton dynamics and community structure in the Baltic Sea. The results show that picophytoplankton play a relevant role in Baltic Sea and shows the importance of monitoring programs to understand picophytoplankton dynamics.

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  • 497.
    Alekic, Anis
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Carmvall, Andreas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Displayintegrering2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This abstract describes the Bachelor of Science in engineering thesis for computer science at Linnaeus University. Arcoma AB in Växjö is a company that constructs and develops complete x-ray systems. The goal of the company is to improve the usability of the system with the help of a LED display. Arcoma can improve the system by exchange the unit that controls the x-ray generator with the LED display instead. This will give the user the ability to have better overview and control of the system, while treating the patient.

    This report describes the implementation of both the software and the hardware for the display, but also the technical background for some standards like HDMI and the LED technologic. The software has been tested directly to the display, and therefore made the testing interesting. We have used the Arcoma system and the development tools to solve the problem. The programming language that was used to solve the problem was mainly C++.

    The result was a system that is build up by the Arcoma hardware platform, our surrounding electronics and the display where the last ones were built in a box. Aside the display a demo application was developed for controlling the generator. This applications is controlled by a USB mouse. Arcoma is pleased with the result of the main problem with the display, and they are also pleased with us solving the additional problems that existed. Arcoma wants to create a demand of this solution in their new products.

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  • 498.
    Aleksikj, Stefan
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Visualization of Quantified Self data from Spotify using avatars2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The increased interest for self-tracking through the use of technology has given birth to the Quantified Self movement. The movement empowers users to gain self-knowledge from their own data. The overall idea is fairly recent and as such it provides a vast space for exploration and research. This project contributes to the Quantified self movement by proposing a concept for visualization of personal data using an avatar. The overall work finds inspiration in Chernoff faces visualization and it uses parts of the presentation method within the project design.  

    This thesis presents a visualization approach for Quantified Self data using avatars. It tests the proposed concept through a user study with two iterations. The manuscript holds a detailed overview of the designing process, questionnaire for the data mapping, implementation of the avatars, two user studies and the analysis of the results. The avatars are evaluated using Spotify data. The implementation offers a visualization library that can be reused outside of the scope of this thesis.

    The project managed to deliver an avatar that presents personal data through the use of facial expressions. The results show that the users can understand the proposed mapping of data. Some of the users were not able to gain meaningful insights from the overall use of the avatar, but the study gives directions for further improvements of the concept. 

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  • 499. Alexander, C
    et al.
    Andersson, Håkan S.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Andersson, L I
    Ansell, R I
    Kirsch, Nicole
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Nicholls, Ian A.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    O'Mahony, John
    Whitcombe, M J
    Molecular imprinting science and technology: a survey of the literature for the years up to and including 20032006In: Journal of molecular recognition, Vol. 19, no 2, p. 106-180Article in journal (Refereed)
  • 500.
    Alexandersson, Mikaela
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Samuelsson, Emelie
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Variation i geometriundervisning: En studie med fokus på tredimensionella objekt2019Student paper other, 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studien är en kvalitativ studie med fokus på hur tredimensionella objekt framställs och arbetas med i matematikundervisningen. Syftet med denna studie är att undersöka hur lärare varierar undervisningsmetoder i undervisningen om geometri och tredimensionella objekt samt vilka variationsmönster som synliggörs i lärarnas undervisning. Studien utgår från tidigare granskad forskning om geometriundervisning. Studiens undersökningar har genomförts på två olika skolor i två olika kommuner i södra Sverige där båda klasserna som varit en del av studien tillhört årskurs 6. Den datainsamling som gjorts bygger på fem genomförda observationer av två olika klasser samt intervjuer av undervisande lärare för dessa klasser. Studiens resultat visar bland annat att geometriundervisning där läromedel kompletteras med andra undervisningsmetoder såsom konkret material kan vara gynnande för elevers inlärning och för lärare vid undervisning om tredimensionella objekt.

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