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  • 351.
    Aikebaier, Faluke
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Pertsova, Anna
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Canali, Carlo M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Effects of short-range electron-electron interactions in doped graphene2015Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, nr 15, artikkel-id 155420Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study theoretically the effects of short-range electron-electron interactions on the electronic structure of graphene, in the presence of substitutional impurities. Our computational approach is based on the π orbital tight-binding model for graphene, with the electron-electron interactions treated self-consistently at the level of the mean-field Hubbard model. The finite impurity concentration is modeled using the supercell approach. We compare explicitly noninteracting and interacting cases with varying interaction strength and impurity potential strength. We focus in particular on the interaction-induced modifications in the local density of states around the impurity, which is a quantity that can be directly probed by scanning tunneling spectroscopy of doped graphene. We find that the resonant character of the impurity states near the Fermi level is enhanced by the interactions. Furthermore, the size of the energy gap, which opens up at high-symmetry points of the Brillouin zone of the supercell upon doping, is significantly affected by the interactions. The details of this effect depend subtly on the supercell geometry. We use a perturbative model to explain these features and find quantitative agreement with numerical results.

  • 352.
    Airey, John
    Högskolan i Kalmar, Humanvetenskapliga institutionen.
    Research into the relationship between learning and the language of instruction2008Annet (Annet vitenskapelig)
  • 353.
    Airey, John
    et al.
    Uppsala University.
    Berge, Maria
    Umeå University.
    That's Funny! The humorous effect of misappropriating disciplinary-specific semiotic resources2014Inngår i: The first Conference of the International Association for Cognitive Semiotics, Lund, Sweden, 25-27 Sept 2014, 2014, s. 50-51Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The socialization of disciplinary outsiders into an academic discipline has been described both in terms of becoming fluent in a disciplinary discourse (Airey, 2009; Airey & Linder, 2009; Northedge, 2002) and achieving disciplinary literacy (Airey, 2011, 2013; Geisler, 1994). In this paper we investigate disciplinary boundaries by documenting the responses of academics to a semiotic disciplinary hybrid. The hybrid we use is the Physikalisches Lied, a bogus piece of sheet music into which disciplinary-specific semiotic resources from the realm of physics have been incorporated to humorous effect.

    The piece is presented to three distinct disciplinary focus groups: physicists, musicians and a group of academics who have had little contact with either discipline. In order to elicit disciplinary responses that are free from researcher prompts, each focus group is first asked the simple, open-ended question What do you see here? Once discussion of this question is exhausted the focus groups are asked to identify as many puns as they can—essentially all the disciplinary items that they feel have been misappropriated—and to attempt to explain what this means from a disciplinary standpoint. The differences in the responses of the three groups are presented and analysed.

    We argue that semiotic material focused on by each of the three groups and the nature of the explanation offered, provide evidence of the degree of integration into the disciplines of physics and music. Our findings shed light on the process of becoming a disciplinary insider and the semiotic work involved in this process.

    Fulltekst (pdf)
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  • 354.
    Airey, John
    et al.
    Linnéuniversitetet, Fakulteten för konst och humaniora (FKH), Institutionen för språk (SPR). Uppsala University.
    Larsson, Johanna
    Uppsala University.
    What Knowledge Do Trainee Physics Teachers Need to Learn?: Differences in the Views of Training Staff2014Inngår i: International Science Education Conference ISEC 2014, National Institute of Education, Singapore, 25-27 November, 2014, Singapore: Ministry of Education, National Institute of Education , 2014, s. 62-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Although the impact of disciplinary differences on teaching and learning has been extensively discussed in the literature (e.g. Becher 1989; Becher and Trowler 2001; Lindblom-Ylännea et al. 2006; Neumann 2001; Neumann and Becher 2002), little research has explored this issue in relation to teacher training. In particular, we know of no work that examines differing views about the knowledge that trainee teachers need to learn across different settings. In this paper we analyse differences in the expressed views of staff involved in the training of prospective physics teachers in three environments: the education department, the physics department and schools. We analyse these differences in terms of two constructs: disciplinary literacy goals (Airey 2011, 2013) and disciplinary knowledge structures (Bernstein 1999).

    In terms of disciplinary literacy we find a stronger emphasis on learning goals for the academy expressed by informants from the physics and education departments. This can be contrasted with the view that the needs of the workplace are paramount expressed by school practitioners.

    Then, using Bernstein’s knowledge structures, we also identify clear differences in views about the nature of knowledge itself with a more hierarchical view of knowledge prevalent in the physics department and the more horizontal view of knowledge prevalent in the education department.

    The study highlights the often-conflicting signals about what constitutes useful knowledge that prospective physics teachers need to negotiate during their training. We tentatively suggest that more attention should be paid to both the theory/practice divide and potential epistemological differences in the training of prospective teachers.

    Fulltekst (pdf)
    Presentation
  • 355.
    Airey, John
    et al.
    Högskolan i Kalmar, Humanvetenskapliga institutionen.
    Linder, Cedric
    Bilingual Scientific Literacy? The Use of English in Swedish University Science Courses2008Inngår i: Nordic Journal of English Studies, ISSN 1654-6970, E-ISSN 1654-6970, Vol. 7, nr 3, s. 145-161Artikkel i tidsskrift (Fagfellevurdert)
  • 356.
    Airey, John
    et al.
    Högskolan i Kalmar, Humanvetenskapliga institutionen.
    Linder, Cedric
    Disciplinary learning in a second language: A case study from university physics2007Inngår i: Researching Content and Language Integration in Higher Education / [ed] Wilkinson, R. & Zegers, V., Maastricht:: Maastricht University Language Centre , 2007, s. 161-171Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 357.
    Airey, John
    et al.
    Högskolan i Kalmar, Humanvetenskapliga institutionen.
    Linder, Cedric
    Looking for Links between Learning and the Discursive Practices of University Science2005Inngår i: 11th EARLI biennial conference, University of Cyprus, Nicosia, 2005Konferansepaper (Fagfellevurdert)
  • 358.
    Airey, John
    et al.
    Linnéuniversitetet, Fakulteten för konst och humaniora (FKH), Institutionen för språk (SPR). Uppsala University.
    Linder, Cedric
    Uppsala University.
    Social semiotics in university physics education: Leveraging critical constellations of disciplinary representations2015Inngår i: 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 , 2015Konferansepaper (Fagfellevurdert)
    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.

    Download (pdf)
    Presentation
  • 359.
    Airey, John
    et al.
    Linnéuniversitetet, Fakulteten för konst och humaniora (FKH), Institutionen för språk (SPR). Uppsala University.
    Urban, Eriksson
    Uppsala University ; Kristianstad University.
    A Semiotic Analysis of the Disciplinary Affordances of the Hertzsprung-Russell Diagram in Astronomy2014Inngår i: The 5th International 360 Conference, Encompassing the multimodality of knowledge, May 8-10 2014, Aarhus University, Denmark, Aarhus: Aarhus University , 2014, s. 22-Konferansepaper (Fagfellevurdert)
    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.

    Fulltekst (pdf)
    fulltext
  • 360.
    Ajvazaj, Albina
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Påverkande faktorer på internkommunikation: En fallstudie på en offentlig verksamhet2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Fulltekst (pdf)
    fulltext
  • 361.
    Akermark, Adam
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Svensson, Martin
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Piratkopiering - en oändlig historia?2006Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Abstrakt (svenska)

    Bakgrund: Piratkopieringen bara ökar och ökar. Program-, spel- och musikbranschen har idag stora problem. En i stort sett okunnig användare kan fixa en nyutgiven skiva innan den nått butikerna på grund av piratkopieringen. Detta problem möjliggörs genom att ingen bra lösning finns i form av fungerande kopieringsskydd samt att fildelningstjänsterna får stort spelrum. Vi går in specifikt och undersöker musikbranschen.

    Syfte: Fördjupa oss i begreppet piratkopiering. Vidare vill vi upplysa och informera såväl musikbranschen som användare om problemet och dess framtid. Vi hoppas att det resultat vi kommer fram till kan ge underlag för vidare forskning.

    Metod: Vår information har tagits från artiklar på Internet samt från litteratur vi ansett vara aktuell. Telefonintervjuer har skett med Magnus Mårtensson, IFPI (International Federation of the Phonographic Industry), programjuristen Anna Burén på Sveriges Radio, Per Sandin,

    General manager EMI marketing samt ett flertal Internetleverantörer. Vi har dessutom sammanställt en enkät som besvarats av en mängd personer.

    Resultat: Många av gårdagens skivköpare anser att priset för en CD-skiva är för dyrt idag. Man har upptäckt piratkopieringen med dess obegränsade funktioner samt insett hur lätt det är att få tag på gratis musik utan repressalier, vilket beror på den idag vaga och ej alltför avskräckande lagstiftningen. Musikbolagen förlorar pengar och höjer därmed priserna för skivorna samtidigt som de aktivt arbetar för att hitta det perfekta kopieringsskyddet eller för att komma på någon annan strålande lösning. Framtiden ser oviss ut och för tillfället har

    piratkopierarna och fildelningstjänsterna trumf på hand.

    Nyckelord: Mp3, CD, Kopieringsskydd, Fildelningstjänster, Upphovsrätt och Musikintressenter.

    Fulltekst (pdf)
    FULLTEXT01
  • 362.
    Akhtar, Naeem
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Alzghoul, Ahmad
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Time performance comparison in determining the weak parts in wooden logs2009Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    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.

    Fulltekst (pdf)
    FULLTEXT01
  • 363. 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 PROMICE1994Inngår i: Physics with GeV-particle beams, Juelich 1994, 1994, s. 519-530Konferansepaper (Fagfellevurdert)
  • 364.
    Akintola, Abayomi Rasheed
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    User Adoption of Big Data Analyticsin the Public Sector2019Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    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. 

  • 365.
    Akkaya, Deniz
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Thalgott, Fabien
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Honeypots in network security2010Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    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.

    Fulltekst (pdf)
    FULLTEXT01
  • 366.
    Akram, Neelam
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    From genes to ecological function in marine bacteria2013Doktoravhandling, med artikler (Annet vitenskapelig)
    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. 

  • 367.
    Akram, Neelam
    et al.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Palovaara, Joakim
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Forsberg, Jeremy
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Lindh, Markus V.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Milton, Debra L.
    Luo, Haiwei
    Gonzalez, Jose M.
    Pinhassi, Jarone
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Regulation of proteorhodopsin gene expression by nutrient limitation in the marine bacterium Vibrio sp AND42013Inngår i: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 15, nr 5, s. 1400-1415Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 368.
    AL Jorani, Salam
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Performance assessment of Apache Spark applications2019Independent thesis Basic level (degree of Bachelor), 180 hpOppgave
    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.

    Fulltekst (pdf)
    fulltext
  • 369.
    Alakangas, Linda J.
    et al.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM). SKB, Äspo Hard Rock Lab, Oskarshamn.
    Mathurin, Frédéric A.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Faarinen, Mikko
    ALS Scandinavia AB Luleå.
    Wallin, Bill
    Geokema AB, Lidingö.
    Åström, Mats E.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    Sampling and Characterizing Rare Earth Elements in Groundwater in Deep-Lying Fractures in Granitoids Under In Situ High-Pressure and Low-Redox Conditions2014Inngår i: Aquatic geochemistry, ISSN 1380-6165, E-ISSN 1573-1421, Vol. 20, nr 4, s. 405-418Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 370.
    Alakangas, Linda J.
    et al.
    Swedish Nucl Fuel & Waste Management Co, Sweden.
    Mathurin, Frédéric A.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM). Bur Rech Geol & Minieres, France.
    Åström, Mats E.
    Linnéuniversitetet, Fakulteten för Hälso- och livsvetenskap (FHL), Institutionen för biologi och miljö (BOM).
    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 Laboratory2020Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 269, s. 15-38Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 371.
    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 Workflows2010Inngår i: 24th IEEE International Conference on Advanced Information Networking and Applications, IEEE, 2010, s. 1241-1248Konferansepaper (Fagfellevurdert)
    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.

  • 372.
    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 Workflows2009Inngår i: 2009 International Conference on Parallel Processing Workshops, IEEE, 2009, s. 457-462Konferansepaper (Fagfellevurdert)
    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.

  • 373.
    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 Workflows2008Inngår i: Fourth International Conference on Semantics, Knowledge and Grid, IEEE Computer Society, 2008, s. 173-180Konferansepaper (Fagfellevurdert)
    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.

  • 374.
    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 evidence1987Inngår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 68, nr 2, s. 284-290Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 375.
    Albertson, Philip
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    WBD – Web Based Diagnostics: Identifierande av parametrar på CAN-bussen2007Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna rapport beskriver ett examensarbete för högskoleingenjörsexamen i datorteknik vid Växjö universitet, utfört av Philip Albertson. Vid företaget BSR i Växjö pågår utvecklingen av en ny teknik benämnd Web Based Diagnostics. Målet med projektet är att göra fordonsdiagnostik tillgängligt för bilägare till ett bra pris. Systemet består av tre delar; en modul som sätts i bilen, en server som hanterar informationen och en klient för att kunden ska kunna nå informationen. Min del i detta projekt var att identifiera hur sökta parametrar nås på CAN-bussen i bilar från VAG (Volkswagen Auto Group) och Saab. Företagets representanter var nöjda med resultatet då det utgör en bra grund för vidareutvecklingen av den prototyp för modulen som utvecklats av EDAB (Elektronik Design AB) i Sundsvall.

    Fulltekst (pdf)
    FULLTEXT01
  • 376.
    Albet-Torres, Nuria
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Gunnarsson, Anders
    Persson, Malin
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Balaz, Martina
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Höök, Fredrik
    Månsson, Alf
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Molecular motors on lipid bilayers and silicon dioxide: different driving forces for adsorption2010Inngår i: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 6, nr 14, s. 3211-3219Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 377.
    Albet-Torres, Nuria
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Månsson, Alf
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
    Long-Term Storage of Surface-Adsorbed Protein Machines2011Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, nr 11, s. 7108-7112Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 378. Albeverio, S.
    et al.
    Cianci, R.
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Operator calculus for p-adic valued symbols and quantization2009Inngår i: Rendicoti Del Seminario Matematico, ISSN 0373-1243, Vol. 67, nr 2, s. 137-150Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 379. Albeverio, S
    et al.
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Shelkovich, M
    Nonlinear singular problems of $p$-adic analysis: associative algebras of $p$-adic distributions2005Inngår i: Izvestiya. Mathematics, ISSN 1064-5632, E-ISSN 1468-4810, Vol. 69, nr 2, s. 221-263Artikkel i tidsskrift (Fagfellevurdert)
  • 380. Albeverio, S
    et al.
    Khrennikov, Andrei
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Shelkovich, V
    Theory of p-adic distributions: linear and nonlinear models2010Bok (Fagfellevurdert)
  • 381. Albeverio, S
    et al.
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Shelkovich, V.M.
    p-adic Colombeau-Egorov type theory of generalized functions2005Inngår i: Mathematische Nachrichten, ISSN 0025-584X, E-ISSN 1522-2616, Vol. 278, nr 1-2, s. 3-16Artikkel i tidsskrift (Fagfellevurdert)
  • 382. Albeverio, Sergio
    et al.
    Cianci, Roberto
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    p-Adic valued quantization2009Inngår i: P-Adic Numbers, Ultrametric Analysis, and Applications, ISSN 2070-0466, E-ISSN 2070-0474, Vol. 1, nr 2, s. 91-104Artikkel, forskningsoversikt (Fagfellevurdert)
    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.

  • 383. Albeverio, Sergio
    et al.
    Gundlach, Mathias
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Lindahl, Karl-Olof
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    On the Markovian Behavior of p-Adic Random Dynamical Systems2001Inngår i: Russ. J. Math. Phys., Vol. 8, nr 2, s. 135-152Artikkel i tidsskrift (Fagfellevurdert)
  • 384. Albeverio, Sergio
    et al.
    Hilbert, Astrid
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Kolokoltsov, Vassili
    Warwick University, Department of Statistics.
    Estimates uniform in time for the transition probability ofdiusions with small drift and for stochastically perturbed Newton equations1999Inngår i: Journal of theoretical probability, ISSN 0894-9840, E-ISSN 1572-9230, Vol. 12, nr 2, s. 293-300Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 385.
    Albeverio, Sergio
    et al.
    University of Bonn, Institute of Applied Mathematics.
    Hilbert, Astrid
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Kolokoltsov, Vassili
    University of Warwick, Department of Statistics.
    Uniform Asymptotic Bounds for the Heat Kernel and the Trace of a Stochastic Geodesic Flow2012Inngår i: Stochastics: An International Journal of Probablitiy and Stochastic Processes, ISSN 1744-2508, E-ISSN 1744-2516, Vol. 84, nr 2-3, s. 315-333Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 386.
    Albeverio, Sergio
    et al.
    Universityof Bonn, Germany.
    Hilbert, Astrid
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Kolokoltsov, Vassily
    University of Warwick, UK.
    Asymptotic Expansions for the Heat Kernel and the Trace of a Stochastic Geodesic Flow2009Manuskript (preprint) (Annet vitenskapelig)
  • 387. Albeverio, Sergio
    et al.
    Hilbert, Astrid
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Kolokoltsov, Vassily
    Transcience of stochastically perturbed classical Hamiltonian systems and random wave operators1997Inngår i: Stochastics and Stochastics Reports, ISSN 1045-1129, E-ISSN 1029-0346, nr 1-2, s. 41-55Artikkel i tidsskrift (Fagfellevurdert)
  • 388. Albeverioa, S.
    et al.
    Khrennikov, Andrei
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Shelkovichg,, V.M.
    The Cauchy problems for evolutionary pseudo-differential equations over p-adic field and the wavelet theory2011Inngår i: Journal of Mathematical Analysis and Applications, ISSN 0022-247X, E-ISSN 1096-0813, Vol. 375, nr 1, s. 82-98Artikkel i tidsskrift (Fagfellevurdert)
  • 389.
    Albinsson, Anneli
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Sundberg, Maria
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Wiktorsson, Veronika
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Matematik i förskolan: Om synsätt och arbetssätt efter kompetensutveckling2007Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    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.

    Fulltekst (pdf)
    FULLTEXT01
  • 390. Albrecht, Mario
    et al.
    Kerren, Andreas
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Klein, Karsten
    Kohlbacher, Oliver
    Mutzel, Petra
    Paul, Wolfgang
    Schreiber, Falk
    Wybrow, Michael
    On Open Problems in Biological Network Visualization2009Inngår i: 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, s. 256-267Kapittel i bok, del av antologi (Fagfellevurdert)
    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.

  • 391. 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 communities1989Inngår i: 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, s. 123-130Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 392. Aldén, Anna
    et al.
    Persson, Anna
    Christensson, Kerstin
    Holmqvist, Olov
    Ohlson, Sten
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Porcine platelet lysate as a supplement for animal cell culture2007Inngår i: Cytotechnology (Dordrecht), ISSN 0920-9069, E-ISSN 1573-0778, Vol. 55, s. 3-8Artikkel i tidsskrift (Fagfellevurdert)
  • 393.
    Alekic, Anis
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Carmvall, Andreas
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Displayintegrering2010Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Arbetet är ett examensarbete i högskoleingenjörsutbildningen, inriktning datateknik, på Linnéuniversitet. Arcoma AB är ett företag i Växjö som utvecklar och tillverkar kompletta röntgensystem. Företaget har som mål att förbättra användarvänligheten av systemet med hjälp av en LED-display. De kan förbättra systemet genom att byta ut en enhet som styr röntgengeneratorn mot LED-displayen. Detta leder till att användaren får bättre kontroll och styrning av systemet, samtidigt som patienten behandlas.

    I rapporten beskrivs implementering av både hårdvara och mjukvara till displayen, samt den tekniska bakgrunden som till exempel HDMI och LED-tekniken. Mjukvaran har testats direkt mot displayen vilket har gjort testningen intressant. För att lösa uppgiften har vi fått använda Arcomas system och utvecklingsverktyg. Programspråket som användes var framförallt C++.

    Resultatet blev ett system som byggs upp av Arcomas hårdvaruplattform, vår kringelektronik och displayen där de sistnämnda byggdes in i en låda. Utöver displayen utvecklades en demoapplikation för generatorstyrning som styrs av en USB-mus. Arcoma är nöjda över resultatet då vi löst huvuduppgiften med displayen, men även löst de extrauppgifter som fanns. Idag försöker Arcoma skapa en efterfrågan för lösningen i deras nya produkter.

    Fulltekst (pdf)
    FULLTEXT01
  • 394.
    Aleksikj, Stefan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Visualization of Quantified Self data from Spotify using avatars2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    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. 

    Fulltekst (pdf)
    fulltext
  • 395. Alexander, C
    et al.
    Andersson, Håkan S.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Andersson, L I
    Ansell, R I
    Kirsch, Nicole
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Nicholls, Ian A.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    O'Mahony, John
    Whitcombe, M J
    Molecular imprinting science and technology: a survey of the literature for the years up to and including 20032006Inngår i: Journal of molecular recognition, Vol. 19, nr 2, s. 106-180Artikkel i tidsskrift (Fagfellevurdert)
  • 396.
    Alexandersson, Mikaela
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Samuelsson, Emelie
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Variation i geometriundervisning: En studie med fokus på tredimensionella objekt2019Student paper other, 10 poäng / 15 hpOppgave
    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.

    Fulltekst (pdf)
    fulltext
  • 397.
    Alexeeva, Zoya
    et al.
    ABB Corporate Research, Germany.
    Perez-Palacin, Diego
    Politecnico di Milano, Italy.
    Mirandola, Raffaela
    Politecnico di Milano, Italy.
    Design Decision Documentation: A Literature Overview2016Inngår i: Software Architecture: 10th European Conference, ECSA 2016, Copenhagen, Denmark, November 28 -- December 2, 2016, Proceedings / [ed] Bedir Tekinerdogan, Uwe Zdun, Ali Babar, Springer, 2016, s. 84-101Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Despite the abundance of research on methodologies for the documentation of design decisions and the evidence linking documentation to the improvement in the systems evolution, their practical adoption seems to be sparse. To understand this issue, we have conducted an overview of state-of-the-art on documentation of design decisions. We pursue an identification of characteristics of the different techniques proposed in the literature, such as the final goal of the documentation, the quantity of information attached to each decision documentation, the rigour of the proposed technique or its level of automation. To unveil these, we propose six classification dimensions, relevant for the industrial application, and use them to structure and analyse the review results. This work contributes with a taxonomy of the area, a structured overview covering 96 publications and a summary of open questions, which can be addressed by future research to facilitate practical adoption.

  • 398.
    Alfalahi, Alyaa
    et al.
    Stockholm University.
    Skeppstedt, Maria
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV). Gavagai AB, Sweden.
    Ahlblom, Rickard
    Stockholm University.
    Baskalayci, Roza
    Stockholm University.
    Henriksson, Aron
    Stockholm University.
    Asker, Lars
    Stockholm University.
    Paradis, Carita
    Lund University.
    Kerren, Andreas
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Expanding a Dictionary of Marker Words for Uncertainty and Negation Using Distributional Semantics2015Inngår i: Proceedings of the 6th International Workshop on Health Text Mining and Information Analysis (Louhi '15): Short Paper Track / [ed] Cyril Grouin, Thierry Hamon, Aurélie Névéol, and Pierre Zweigenbaum, Association for Computational Linguistics , 2015, s. 90-96Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Approaches to determining the factuality of diagnoses and findings in clinical text tend to rely on dictionaries of marker words for uncertainty and negation. Here, a method for semi-automatically expanding a dictionary of marker words using distributional semantics is presented and evaluated. It is shown that ranking candidates for inclusion according to their proximity to cluster centroids of semantically similar seed words is more successful than ranking them according to proximity to each individual seed word. 

  • 399.
    Alfelt, Gustav
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Lövdahl, Susanna
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Undersökning av metoder för att analysera och modellera efter stora datamaterial, hantering av programmet SPSS samt en studie i Kronoberg läns gymnasieelevers psykiska ohälsa2008Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Landstinget i Kronobergs län utförde 2006 en enkätundersökning bland elever i årskurserna 5, 8 och gymnasiets årskurs 2. Datamaterialet för gymnasieeleverna har studerats i detta arbete där den psykiska ohälsan och alkoholkonsumtion varit i fokus.

    Det statistiska arbetet är uppdelat i tre delar: Metodbeskrivning, hantering av programmet SPSS samt en undersökning av gymnasieelevers psykiska ohälsa och alkoholkonsumtion. I metodbeskrivningen har metoderna dikotomisering, logistisk regression, Wald, faktorinteraktion och kategorisering beskrivits. För hantering av stora datamaterial samt för att kunna ta fram statistiska samband rörande psykisk ohälsa och alkoholkonsumtion har programmet SPSS använts och illustrerats i arbetet. De förklarande variablerna som varit mest inflytelserika mot den psykiska ohälsan var ’Tycker du att du är frisk?’, ’Har du någonsin använt läkemedel tillsammans med alkohol i berusningssyfte’ samt ’Trivs du med livet?’. När undersökningen för gymnasieelevers alkoholkonsumtion studerades var de gemensamma signifikanta faktorerna för både killar och tjejer ’Skolkar du?’, ’Känner du dig ofta irriterad eller på dåligt humör?’ och ’Har någon vuxen behandlat dig fysiskt illa?’ där samtliga förklarande faktorer bidrog till en ökad sannolikhet att konsumera mycket alkohol. Då undersökning av variabeln symtom, variabeln oro samt deras interaktion studerades för killar respektive för tjejer mot den psykiska ohälsan kunde man se att variabeln symtom för killar var inflytelserik samt interaktionen mellan oro och symtom. För tjejerna var däremot variabeln oro inflytelserik samt variabeln symtom men inte deras interaktion.

    Fulltekst (pdf)
    FULLTEXT01
  • 400.
    Alfengård, Kristina
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Om informationslogistik är svaret. Vad är frågan?2010Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    Studiens syfte är att identifiera informationslogistiska problem och behov med utgångspunkt i förändringsprojekt inom strategi, organisation och IT för att därigenom visa vad informationslogistik kan lösa för problem och behov. Informationslogistik är ett tvärvetenskapligt ämne och rör sig inom disciplinerna informatik, ekonomi/management och logistik. Utifrån ämnets tresidighet valdes utgångspunkterna strategi, organisation och IT.

    Forskningen inom informationslogistik redogör för hur IT kan användas för en behovsorienterad informationsförsörjning. I korthet redogör forskningen för hur information kan lagras i datalager och hur informationen är möjlig att bearbetas med olika intelligenta verktyg. Logistik är de bakomliggande förhållningssättet på hur olika IT lösningar kan förse rätt information till rätt person. Forskningen visar på lite olika synsätt på informationslogistik och vad ordet syftar till. Frågan är om det finns relevans och nytta för verksamheter att hantera informationslogistik.

    Studien baseras på metoden Grundad Teori (GT). Syftet med metoden är att låta praktikens erfarenheter styra studiens inriktning och sedan spegla det mot aktuell teori. Studiens syfte synliggör också valet av förhållningssätt. Med anledning av studiens syfte tar studien ett hermeneutiskt perspektiv. Det empiriska underlaget har samlats in genom telefonintervju med sakkunniga konsulter inom tjänsteområdena strategi, organisation och IT.  Genom analysen har det identifierats att det inom ett förändringsprojekt existerar tre olika typer av informationsflöden.

    • Strukturerade informationsflöden.
    • Omstrukturerande informationsflöden.
    • Ostrukturerade informationsflöden.

    Utöver ovan informationsflöden har det också identifierats situationer där informationen är dynamisk respektive stabil. Analysen gör således skillnad på flödet av information och informationen i sig. Följande punkter visar på de problem som är att betrakta som informationslogistiska.

    • Utveckla affärsplaner.
    • Informationen är separerad från användarens behov.
    • Man lyckas inte nå ut med informationen som finns på papper.
    • Ledningen vill ha information på tvären och medarbetarna på längden.
    • Konsulter tar över informationshanteringen.
    • Organisering av processer och människor.
    • Informationen hålls separerad och påverkar processutförandet.

     

    Fulltekst (pdf)
    FULLTEXT01
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