hh.sePublications
Change search
Refine search result
6789101112 401 - 450 of 1877
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 401. Crossley, Mark
    et al.
    Lindell, Joakim
    Lösenordsmönster: Att förebygga svaga lösenord2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Passwords are used more now than ever before. Their use is based on the ideathat the password is only known to the user and that its secrecy prevents othersfrom accessing potentially valuable or sensitive information. But how secret isa password in today's high tech world? Passwords are generally converted into hashsums and saved in databases. Cracking a password requires that the process is reversed so that the actual password can be derived from the hash sum. This cracking process can beachieved by two methods. An attacker can test all the possible combinations,(brute force cracking) or the attacker can compare the password with a list ofcommonly used passwords (cracking with wordlists). This paper investigates a passwords vulnerability to both brute force crackingand cracking via wordlists. It uses a modern computer's processing speedsto establish the amount of time to crack a certain password via brute forcecracking. It also deploys state of the art techniques to examine a password'scontent. It analyses three databases from dierent online communities to examineany possible correlation between a user's hobby interest and their choiceof password. This paper finds that the majority of passwords won't remain secret for very long. Short passwords which consist of a small alphabet are particularly vulnerable to brute force attacks. However due to the increasing speed of modern computers even passwords which are twelve characters long are still potentially vulnerable. This paper finds that users from a variety of online communities choose common passwords which are likely to be on a wordlist and thus susceptible to cracking via word list attacks.

    This paper provides suggestions on how a user can choose a stronger password.

  • 402.
    Cseplö, Madeleine
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Wilhelmsson, Anna
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Korsbo, Jonna
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Ungdomars medvetenhet om IT-relaterad brottslighet2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The world we live in is becoming more technological each day that goes by, but does our knowledge follow this development? Unfortunately that’s probably not the case, because it seems that all too few reflect over the risks caused by these developments and how the Swedish laws are applied in this environment. Because of this, it can be difficult for both young and adults to know what is allowed and not in the world of technology. In this modern age the use of technology has its debut in earlier ages and plays a major role in both the education and for social interactions. The social media has become a part of young people's everyday lives and also unfortunately contributed to the increase of actions like hate crimes over the Internet.

     

    The goal of this project was to create a dialogue about cyber crimes among young people, but also to educate the older generation of the problem. More than half of the students involved in our study, (59.2 %), said that they wanted devote some of their time at school to address cyber-crimes. With this at hand we can establish that there definitely is a need to inform young people about this subject. The pupils knowledge about cyber crimes varied between the ages, the youngest were more confident about what they are allowed to do on the Internet or not. While only 60.5 % of the oldest students felt sufficiently informed. Another finding is that several of the students have a disturbing attitude towards not only hate crimes over the Internet but also cyber crimes in general. They are under the impression that because of the increased frequency of the crimes they no longer consider it to be a major issue. Also, if they would perform an illegal act, there are only a few of the students that would worry about the consequences, in this case it was only about half of the older students.

     

    The extent of this study is far from substantial, since the study was limited to one school, this because there was only one of the schools that wanted to participate. Despite that fact, the results from the study are very interesting, and it says a lot about how the mentality towards these kinds of crimes are amongst young people today.

  • 403.
    Cukier, Wendy
    et al.
    Ted Rogers School of Management, Ryerson University, Toronto, Ontario, Canada.
    Ngwenyama, Ojelanki K.
    Ted Rogers School of Management, Ryerson University, Toronto, Ontario, Canada.
    Bauer, Robert
    Institute for Organizational Studies, Johannes Kepler University, Linz, Austria.
    Middleton, Catherine
    Ted Rogers School of Management, Ryerson University, Toronto, Ontario, Canada.
    A Critical Analysis of Media Discourse on Information Technology: Preliminary Results of a Proposed Method for Critical Discourse Analysis2009In: Information Systems Journal, ISSN 1350-1917, E-ISSN 1365-2575, Vol. 19, no 2, p. 175-196Article in journal (Refereed)
    Abstract [en]

    Since the 1980s, there has been a growing body of critical theory in information systems research. A central theoretical foundation of this research is Habermas’ theory of communicative action, which focuses on implications of speech and proposes general normative standards for communication. Habermas also places particular emphasis on the importance of the public sphere in a democratic society, critiquing the role of the media and other actors in shaping public discourse. While there has been growing emphasis on critical discourse analysis (CDA), there has been limited effort to systematically apply Habermas’ validity claims to empirical research. Moreover, while critical research in information systems has examined communication within the organizational context, public discourse on information technology has received little attention. The paper makes three primary contributions: (1) it responds to Habermas’ call for empirical research to ground and extend his theory of communication in every day critical practice; (2) it proposes an approach to applying Habermas’ theory of communication to CDA; and (3) it extends the reach of critical research in information systems beyond micro-level organizational concerns and opens up to critical reflection and debate on the impact of systematically distorted communication about technology in the public sphere.

  • 404.
    Czarnecki, Krzysztof
    et al.
    University of Waterloo, Waterloo, Canada.
    O’Donnell, John T.
    University of Glasgow, Glasgow, United Kingdom.
    Striegnitz, Jörg
    Research Centre Jülich, Jülich, Germany.
    Taha, Walid
    Rice University, Houston, Texas, USA.
    DSL Implementation in MetaOCaml, Template Haskell, and C++2004In: Domain-Specific Program Generation: International Seminar, Dagstuhl Castle, Germany, March 23-28, 2003. Revised Papers / [ed] Christian Lengauer, Don Batory, Charles Consel & Martin Odersky, Berlin: Springer Berlin/Heidelberg, 2004, Vol. 3016, p. 51-72Conference paper (Refereed)
    Abstract [en]

    A wide range of domain-specific languages (DSLs) has been implemented successfully by embedding them in general purpose languages. This paper reviews embedding, and summarizes how two alternative techniques - staged interpreters and templates - can be used to overcome the limitations of embedding. Both techniques involve a form of generative programming. The paper reviews and compares three programming languages that have special support for generative programming. Two of these languages (MetaOCaml and Template Haskell) are research languages, while the third (C++) is already in wide industrial use. The paper identifies several dimensions that can serve as a basis for comparing generative languages.

  • 405.
    Dahlborg, Anna
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Engberg, Johanna
    Halmstad University, School of Business and Engineering (SET).
    Hur framställer miljökonsekvensbeskrivningarna vindkraftens effekter på miljön?: Ett arbete om vindkraft och dess påverkan.2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 406.
    Dahlgren, Linnea
    Halmstad University, School of Business and Engineering (SET).
    Bumblebees in a region of northwestern Scania: Is species number correlated to the number of flowering angiosperms and does gene flow occur between four locations?2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Pollination, one of our ecosystem services, is considered to be in critical condition due to a worldwide reduction in pollinators and their biodiversity. As the agricultural landscape becomes more and more intense, the pollinators lose important food and living resources.

        In temperate ecosystems, bumblebees (Bombus spp) are an important group of wild pollinators, and as with pollinators in general, they are declining in both abundance and richness, in Sweden as well as other countries.

         The purpose of this study was to see if bumblebee species number of a location is linked to the location’s number of flowering angiosperm species in northwestern Scania when examining eight locations, and to see if gene flow existed between four chosen locations.  

         The result of this study suggests that it is not possible to tell from the flowering angiosperm species how many bumblebee species that will be abundant, but that it might be possible to tell the number of bumblebee individuals. With the number of bumblebee species, the abundant Fabaceae species was more important than the total number of flowering angiosperms of the location. The number of abundant Fabaceae species was strongly correlated to the bumblebee diversity index of the locations, indicating that it is a group of flowers closely linked to bumblebees.

         To see if gene flow occurred between the chosen locations, mtDNA sequences were compared in neighbor joining trees. The result showed that though some tendencies of isolation existed, gene flow seemed to occur in general between the locations in that fragmented and human dominated landscape of northwestern Scania.

  • 407.
    Dahlin, C.
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Aronsson, H.
    Department of Plant Physiology, Göteborg University, Box 461, SE-405 30 Göteborg, Sweden.
    Almkvist, J.
    Department of Plant Physiology, Göteborg University, Box 461, SE-405 30 Göteborg, Sweden.
    Sundqvist, C.
    Department of Plant Physiology, Göteborg University, Box 461, SE-405 30 Göteborg, Sweden.
    Protochlorophyllide-independent import of two NADPH: Pchlide oxidoreductase proteins (PORA and PORB) from barley into isolated plastids2000In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 109, no 3, p. 298-303Article, review/survey (Refereed)
    Abstract [en]

    The enzyme catalysing the reduction of protochlorophyllide (Pchlide) to chlorophyllide (Chlide), NADPH:Pchlide oxidoreductase (POR; EC 1.6.99.1), is a nuclear-encoded protein that is post-translationally imported to the plastid, In barley and Arabidopsis thaliana, the reduction of Pchlide is controlled by two different PORs, PORA and PORE. To characterise the possible Pchlide dependency for the import reaction, radiolabelled precursor proteins of barley PORA and PORE (pPORA and pPORB, respectively) were used for in vitro assays with isolated plastids of barley and pea with different contents of Pchlide, To obtain plastids with different endogenous levels of Pchlide, several methods were used. Barley plants were grown in darkness or in greenhouse conditions for 6 days. Alternatively, greenhouse-grown pea plants were incubated for 4 days in darkness before plastid isolation, or chloroplasts isolated from greenhouse-grown plants were incubated with delta-aminolevulinic acid (ALA), an early precursor in the Chi biosynthesis resulting in elevated Pchlide contents in the plastids, Both barley pPORA and pPORB were effectively imported into barley and pea chloroplasts isolated from the differentially treated plants, including those isolated from greenhouse-grown plants. The absence or presence of Pchlide did not significantly affect the import capacity of barley pPORA or pPORB, Assays performed on stroma-enriched fractions from chloroplasts and etioplasts of barley indicated that no post-import degradation of the proteins occurred in the stroma, irrespective of whether the incubation was performed in darkness or in light.

  • 408.
    Dahlin, Clas
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Plant Cell Biology: Energy transduction in plant cells.
    Surface charge densities and membrane fluidities in thylakoids with different degrees of thylakoid appression after Norflurazon treatment2003In: Photosynthetica (Praha), ISSN 0300-3604, E-ISSN 1573-9058, Vol. 41, no 4, p. 635-639Article in journal (Refereed)
    Abstract [en]

    Wheat seedlings (Triticum aestivum L.) develop plastids (etioplasts and chloroplasts) which exhibit alterations in inner membrane organisation after treatment with Norflurazon (NF), an inhibitor of carotenoid biosynthesis. In dark-grown plants, results in a decreased amount of partitions (contact zones) between prothylakoids. In weak red light, the results in plants containing chloroplasts devoid of grana.

    Assays have been performed to investigate the membrane surface charge density in these membranes, and relate possible differences to the absence of (pro-)thylakoid overlap after NF teatment. Using the fluorescent probe 9- amino acridine (9-AA), the average surface charge density of isolated PTs was -21.8±3.2 mC m-2 and - 27.4±2.6 mC m-2 in the control and after, respectively. Thylakoid membranes isolated from plants grown in weak red light exhibited slightly more negative values, -23.5±2.9 mC m-2 and -29.0±2.1 mC m-2, in control and after, respectively. The surface charge density of destacked thylakoids from greenhouse-grown untreated plants, containing extensive grana stacking, was -34.3±2.5 mC m-2. Assays using the fluorescent probe of DPH (1,6- diphenyl- 1,3,5- hexatriene) showed that this probe exhibits a higher polarisation value when incorporated into thylakoids from NF- treated plants compared to untreated plants grown in weak red light. The highest polarisation value was found in untreated plants grown in the greenhouse. This indicates a lower rotation transition of the probe in the lipid environment of thylakoids after NF treatment, which can be interpreted as more rigid membranes. These results suggest that the surface charge density and the mobility of membrane components may play a major role for the formation of partitions in dark-grown plants and in the formation of grana in plants grown in weak red light.

    23 Additional key words: chloroplasts; etioplasts; (pro-)thylakoids; Triticum; stacking;

    wheat; 9- amino acridine.

  • 409.
    Dalzochio, Marina Schmidt
    et al.
    Laboratório de Ecologia e Evolução, Universidade do Vale do Taquari – UNIVATES, Lajeado, Brazil.
    Périco, Eduardo
    Laboratório de Ecologia e Evolução, Universidade do Vale do Taquari – UNIVATES, Lajeado, Brazil.
    Renner, Samuel
    Laboratório de Ecologia e Evolução, Universidade do Vale do Taquari – UNIVATES, Lajeado, Brazil.
    Sahlén, Göran
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Description of the final stadium larva of Erythrodiplax media (Odonata: Libellulidae) with preliminary key to known South American larvae in the genus2018In: International Journal of Odonatology, ISSN 1388-7890, Vol. 21, no 2, p. 93-104Article in journal (Refereed)
    Abstract [en]

    The larva of Erythrodiplax media is described and illustrated based on two exuviae of reared larvae and one final stadium larva collected in Xangri-lá, State of Rio Grande do Sul, Brazil. The larva of E. media can be distinguished from other species of Erythrodiplax by the presence of lateral spines on S8 and S9, the number of premental setae (n = 22), palpal setae (n = 7) and by the mandibular formula. We also provide a preliminary key to known South American larvae in the genus. © 2018 Worldwide Dragonfly Association.

  • 410. Danielsson, Christopher
    Comparison in muscle activity between bench press and push-up exercise: An electromyography study2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background Physical activity has many benefits, including the prevention of multiple different diseases. One way to perform physical activity is through resistance training, where some sort of resistance is used to increase the load on the muscles during contraction. For training the upper-body, the bench press exercise is a good option. However, not everyone has the equipment to perform this exercise. The push-up exercise has a similar movement pattern and uses the same muscles as well as no requirement for equipment. Therefore, it would be interesting to see which exercise activates the pectoralis major and triceps brachii, respectably, more. Aim The aim of this study was to compare the muscle activation of the pectoralis major and triceps brachii during push-up and bench press with push-up replicated resistance through EMG-testing. Method 21 male subjects participated in this study. EMG measurement was used on the pectoralis major and triceps brachii to record muscle activity. Following a MVIC test for both muscles, to get a reference value, five repetitions of the bench press exercise at 64% of the subject’s body weight, at rate of 40 beats per minute. Following a three-minute rest, the subjects performed five repetitions of the push-up exercise at the same rate. Three of the five repetitions were selected for further analysis. All data collected was converted to percent of MVIC (%MVIC) before any analysis. Results The results of this study showed a significantly higher activation of the pectoralis major during the bench press exercise compared to the push-up exercise (p=0.014). The results did not show a significant difference in the activation of the triceps brachii during the two exercises. Conclusion This study shows that for training the pectoralis major, the bench press exercise is preferable to the push-up exercise at the same load. For training the triceps brachii, the bench press and pushup exercises seem interchangeable at the same load.

  • 411.
    Dantas Mendes, Lipe Renato
    Halmstad University, School of Business and Engineering (SET).
    Long term assessment of created wetlands functioning within agricultural areas2012Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The polluted agricultural wastewater, after reaching marine recipients, can cause eutrophication. This problem can be tackled and mitigated by using constructed wetlands as water treatment systems. The fact that constructed wetlands work through long periods of time has led many scientists to evaluate how long they can still treat their influents effectively. The development and growth of vegetation and the accumulation of nutrients on the soils in a wetland are expected to occur. These processes change the wetland efficiency to remove pollutants. In this study, a set of wetlands constructed to treat agricultural wastewater were analyzed in different periods to assess if there is a difference in removal efficiency of nitrogen and phosphorus. This assessment was performed by analyzing the retention rate, k and k20 values, which are variables that quantify the nutrients removal, in different periods of each employed wetland. Some of the observations demonstrated differences when comparing different periods of the wetlands. The nitrogen removal presented better performance in one of the employed wetlands when this was older. Another employed wetland has not shown a clear difference between different periods. In the wetlands with high vegetation densities, the nitrogen removal was more stable over consecutive years. The occurrence of oscillations in nitrogen removal was observed more often in the wetlands with the highest vegetation densities over consecutive years. The phosphorus removal presented no clear differences between different periods. The results suggest that the removal of nitrogen improves after wetland creation due to the growth of vegetation. In addition, they suggest that wetlands with high vegetation densities tend to oscillate the nitrogen removal more or less often according to the density of the vegetation due to the balance between denitrification and decomposition. Further, the results suggest that the removal of phosphorus remains unchanged over longer periods than the periods considered in this study (four to six years) due to the deposition of organic matter on the soils.

  • 412.
    David, Jennifer
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Valencia, Rafael
    Carnegie Mellon University, Pittsburgh, USA.
    Philippsen, Roland
    Google Inc..
    Bosshard, Pascal
    ETH Zürich, Zürich, Switzerland.
    Iagnemma, Karl
    Massachusetts Institute of Technology, Cambridge, MA, USA.
    Gradient Based Path Optimization Method for Autonomous Driving2017In: 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), [Piscataway, NJ]: IEEE, 2017, p. 4501-4508Conference paper (Refereed)
    Abstract [en]

    This paper discusses the possibilities of extending and adapting the CHOMP motion planner to work with a non-holonomic vehicle such as an autonomous truck with a single trailer. A detailed study has been done to find out the different ways of implementing these constraints on the motion planner. CHOMP, which is a successful motion planner for articulated robots produces very fast and collision-free trajectories. This nature is important for a local path adaptor in a multi-vehicle path planning for resolving path-conflicts in a very fast manner and hence, CHOMP was adapted. Secondly, this paper also details the experimental integration of the modified CHOMP with the sensor fusion and control system of an autonomous Volvo FH-16 truck. Integration experiments were conducted in a real-time environment with the developed autonomous truck. Finally, additional simulations were also conducted to compare the performance of the different approaches developed to study the feasibility of employing CHOMP to autonomous vehicles. ©2017 IEEE

  • 413.
    David, Jennifer
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Valencia, Rafael
    Carnegie Mellon University, Pittsburgh, USA.
    Philippsen, Roland
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Iagnemma, Karl
    Massachusetts Institute of Technology, Cambridge, USA.
    Local Path Optimizer for an Autonomous Truck in a Harbour Scenario2017Conference paper (Refereed)
    Abstract [en]

    Recently, functional gradient algorithms like CHOMP have been very successful in producing locally optimal motion plans for articulated robots. In this paper, we have adapted CHOMP to work with a non-holonomic vehicle such as an autonomous truck with a single trailer and a differential drive robot. An extended CHOMP with rolling constraints have been implemented on both of these setup which yielded feasible curvatures. This paper details the experimental integration of the extended CHOMP motion planner with the sensor fusion and control system of an autonomous Volvo FH-16 truck. It also explains the experiments conducted on the differential-drive robot. Initial experimental investigations and results conducted in a real-world environment show that CHOMP can produce smooth and collision-free trajectories for mobile robots and vehicles as well. In conclusion, this paper discusses the feasibility of employing CHOMP to mobile robots.

  • 414.
    David, M.
    et al.
    Inst. National de la Recherche Agronomique, UMR Environnement et Grandes Cultures, Thiverval-Grignon, France.
    Loubet, B.
    Inst. National de la Recherche Agronomique, UMR Environnement et Grandes Cultures, Thiverval-Grignon, France.
    Cellier, P.
    Inst. National de la Recherche Agronomique, UMR Environnement et Grandes Cultures, Thiverval-Grignon, France.
    Mattsson, Marie
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS).
    Schjoerring, J.K.
    Plant and Soil Science Laboratory, University of Copenhagen, Faculty of Life Sciences, Copenhagen, Denmark.
    Nemitz, E.
    Centre for Ecology and Hydrology (Edinburgh Research Station), Bush Estate, Penicuik, Midlothian ,UK.
    Roche, R.
    Inst. National de la Recherche Agronomique, UMR Environnement et Grandes Cultures.
    Riedo, M.
    Inst. fur Agrarokologie, Bundesforschungsanstalt fur Landwirtschaft (FAL), Braunschweig, Germany.
    Sutton, M.A.
    Centre for Ecology and Hydrology (Edinburgh Research Station), Bush Estate, Penicuik, Midlothian ,UK.
    Ammonia sources and sinks in an intensively managed grassland canopy2009In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 6, no 9, p. 1903-1915Article in journal (Refereed)
    Abstract [en]

    Grasslands represent canopies with a complex structure where sources and sinks of ammonia (NH3) may coexist at the plant level. Moreover, management practices such as mowing, hay production and grazing may change the composition of the sward and hence the source-sink relationship at the canopy level as well as the interaction with the atmosphere. There is therefore a need to understand the exchange of ammonia between grasslands and the atmosphere better, especially regarding the location and magnitude of sources and sinks. Fluxes of atmospheric NH3 within a grassland canopy were assessed in the field and under controlled conditions using a dynamic chamber technique (cuvette). These cuvette measurements were combined with extraction techniques to estimate the ammonium (NH+4 ) concentration and the pH of a given part of the plant or soil, leading to an estimated ammo- nia compensation point (Cp ). The combination of the cuvette and the extraction techniques was used to identify the poten- tial sources and sinks of NH3 within the different compart- ments of the grassland: the soil, the litter or senescent “litter leaves”, and the functioning “green leaves”. A set of six field experiments and six laboratory experiments were performed in which the different compartments were either added or removed from the cuvettes.The results show that the cuvette measurements agree with the extraction technique in ranking the strength of compartment sources. It suggests that in the studied grassland the green leaves were mostly a sink for NH3 with a compensation point around 0.1–0.4 μg m−3 and   an NH3 flux of 6 to 7 ng m−2 s−1. Cutting of the grass did not increase the NH3 fluxes of the green leaves. The litter was found to be the largest source of NH3 in the canopy, with a Cp of up to 1000μgm−3 NH3 andanNH3 fluxupto90ngm−2 s−1. The litter was found to be a much smaller NH3 source when dried (Cp =160 μg m−3 and FNH3 =35 ng m−2 s−1 NH3 ). Moreover emissions from the litter were found to vary with the relative humidity of the air. The soil was a strong source of NH3 in the period immediately after cutting (Cp =320 μg m−3 and FNH3 =60 ng m−2 s−1 ), which was nevertheless always smaller than the litter source. The soil NH3 emissions lasted, however, for less than one day, and were not observed with sieved soil. They could not be solely explained by xylem sap flow extruding NH+4 . These results indicate that future research on grassland-ammonia relationships should focus on the post-mowing period and the role of litter in interaction with meteorological conditions.

  • 415.
    Davidenko, N.A.
    et al.
    Kiev Taras Shevchenko National University.
    Pavlov, V.A.
    Kiev Taras Shevchenko National University.
    Chuprina, N.G.
    Kiev Taras Shevchenko National University.
    Davidenko, I.I.
    Kiev Taras Shevchenko National University.
    Bååth, Lars B.
    Agellis Group AB, 22100 Lund, Sweden .
    Thermal influence on passing of polarized light through the SnO2: In2O3 layers2006In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 100, no 2, p. 023111-1-023111-3Article in journal (Refereed)
    Abstract [en]

    Thermal dependent changes of light depolarization degree were observed in the SnO2:In2O3 (ITO) layers deposited onto the flat glass substrates which are used usually as electrodes for optoelectronic devices. The observed effect is reversible. It can be attributed to the changes of nanostructure geometry in the bulk of the ITO layer as well as on its surface. Such geometric changes involve dispersion of polarized light. The investigated effect should be taken into consideration when developing optoelectronic devices because it can provoke distortion of the optical information field.

  • 416.
    Davidsson, Ida
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Karlsson, Emma
    Halmstad University, School of Business and Engineering (SET).
    Försvarsmaktens, kommuners och länsstyrelsers arbete med tillsyn och tillstånd inom miljö- och hälsoskyddsområdet2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Arbetet inriktar sig på två frågor, där den ena delen behandlar olika tillsynsmyndigheters arbete inom miljö- och hälsoskyddsområdet, där en jämförelse har gjorts mellan kommuner, länsstyrelser och Generalläkaren. Generalläkaren är tillsynsansvarig inom Försvarsmaktens verksamheter. Den andra delen fokuserar på tillståndsärenden där intressekonflikter har uppstått mellan intresset för totalförsvaret och övriga riksintressen samt andra skyddsvärda områden enligt miljöbalken. Bakgrundsfakta och information om de olika myndigheternas arbete har inhämtats genom litteraturstudier av relevant litteratur om tillsyn och ärenden, och genom intervjuer med tillsynspersonal samt studiebesök hos de nämnda myndigheterna. Arbetet med tillsyn inom miljö- och hälsoskyddsområdet skiljer sig inte nämnvärt mellan de olika myndigheterna när det gäller ett antal punkter. De skillnader som framkommit i studien har sammanställts i en tabell. Exempel på skillnader är hur de olika myndigheterna prioriterar sina tillsynsobjekt och hur de går tillväga för att bedöma dess miljöpåverkan. Skillnaderna grundar sig främst på att myndigheterna är uppbyggda på olika sätt. I delen som handlar om intressekonflikter studerades vattenskyddsområdet på Galgberget, stoppområden, Veckholms skjut- och övningsfält och Uppsala flygplats. Resultaten från dessa fall visar att när totalförsvaret har företräde framför andra intressen saknas ofta kunskap och förståelse hos övriga berörda parter för anledningen till företrädet, vilket ofta leder till överklaganden och långa rättsliga processer.

  • 417.
    Dawood, Sivan
    et al.
    Halmstad University, School of Information Technology.
    Frindt, Catharina
    Halmstad University, School of Information Technology.
    Bluetooth Low Energy using Trilateration with Anybus Wireless Bolt2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 418.
    De Maeyer, Matthias
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    How to implement a local aware messaging service easily2011Independent thesis Advanced level (degree of Master (Two Years)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    During the last years the use of SMS had a lot of competition because of the rise of the social networks like Twitter and Facebook. If somebody wants to share something with his friends or even the world he can just post it on these social networks instead of sending an SMS to his friends. On the other hand this provides a lot of information to everyone that makes it impossible to see what is interesting or what is not.

    Using these networks the information a person sees gets filtered on content for Twitter, friendship connection for Facebook or people who now your phone number for SMS. But what if you want to know something about the people around you or if you want to share something with the people in your location?

    This thesis will look into the three main problems this creates to make a local messaging service for a smartphone. 1) The connection problem, where different connectivity possibilities that can be used will be studied. 2) The social problem, where the problem of filtering out interesting information will be studied. 3) The programming problem where we will take a look on the possibilities different implementation approaches have to offer.

    Using this information we implemented a proof of concept as a web application and used a server to store all the information. Therefore we made use of the mobile internet and the GPS sensor in a smartphone. To filter out interesting content we placed messages in categories.

    The biggest benefit using these technologies is the fact that there is no limit on the size and location of the area in which someone wants to send a message. Another benefit is the fact that receivers won’t poll for updates on the server because we made use of a Comet server that is able to push updates to the clients.

  • 419.
    Dechesne, Francien
    et al.
    Philosophy Section, Faculty of Technology, Policy and Management, Delft University of Technology, Delft, The Netherlands.
    Mousavi, Mohammad Reza
    Department of Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands.
    Interpreted Systems Semantics for Process Algebra with Identity Annotations2013In: Logic, Language, and Computation: 9th International Tbilisi Symposium on Logic, Language, and Computation, TbiLLC 2011, Kutaisi, Georgia, September 26-30, 2011, Revised Selected Papers / [ed] Guram Bezhanishvili, Sebastian Löbner, Vincenzo Marra & Frank Richter, Heidelberg: Springer Berlin/Heidelberg, 2013, Vol. 7758, p. 182-205Chapter in book (Refereed)
    Abstract [en]

    Process algebras have been developed as formalisms for specifying the behavioral aspects of protocols. Interpreted systems have been proposed as a semantic model for multi-agent communication. In this paper, we connect these two formalisms by defining an interpreted systems semantics for a generic process algebraic formalism. This allows us to translate and compare the vast body of knowledge and results for each of the two formalisms to the other and perform epistemic reasoning, e.g., using model-checking tools for interpreted systems, on process algebraic specifications. Based on our translation we formulate and prove some results about the interpreted systems generated by process algebraic specifications. © 2013 Springer-Verlag.

  • 420.
    Dechesne, Francien
    et al.
    Department of Computer Science, Eindhoven University of Technology, P.O. Box 513, NL-5600MB, Eindhoven, The Netherlands.
    Mousavi, Mohammad Reza
    Department of Computer Science, Eindhoven University of Technology, P.O. Box 513, NL-5600MB, Eindhoven, The Netherlands.
    Orzan, Simona
    Department of Computer Science, Eindhoven University of Technology, P.O. Box 513, NL-5600MB, Eindhoven, The Netherlands.
    Operational and epistemic approaches to protocol analysis: bridging the gap2007In: Logic for Programming, Artificial Intelligence, and Reasoning: 14th International Conference, LPAR 2007, Yerevan, Armenia, October 15-19, 2007. Proceedings, Berlin: Springer Berlin/Heidelberg, 2007, Vol. 4790, p. 226-241Conference paper (Refereed)
    Abstract [en]

    Operational models of protocols, on one hand, are readable and conveniently match their implementation, at a certain abstraction level. Epistemic models, on the other hand, are appropriate for specifying knowledge-related properties such as anonymity. These two approaches to specification and analysis have so far developed in parallel and one has either to define ad hoc correctness criteria for the operational model or use complicated epistemic models to specify the operational behavior. We work towards bridging this gap by proposing a combined framework which allows modeling the behavior of a protocol in a process language with an operational semantics and supports reasoning about properties expressed in a rich logic with temporal and epistemic operators.

  • 421.
    Dechesne, Francien
    et al.
    Department of Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands.
    Mousavi, Mohammad Reza
    Department of Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands & Department of Computer Science, Reykjavík University, Reykjavík, Iceland.
    Orzan, Simona M.
    Department of Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands.
    Operational and Epistemic Approaches to Protocol Analysis: Bridging the Gap2007Report (Other academic)
    Abstract [en]

    Operational models of (security) protocols, on one hand, are readable and conveniently match their implementation (at a certain abstraction level). Epistemic models, on the other hand, are appropriate for specifying knowledge-related properties such as anonymity or secrecy. These two approaches to specification and verification have so far developed in parallel and one has either to define ad hoc correctness criteria for the operational model or use complicated epistemic models to specify the operational behavior. We work towards bridging this gap by proposing a combined framework which allows for modeling the behavior of a protocol in a process language with an operational semantics and supports reasoning about properties expressed in a rich logic which combines temporal and epistemic operators.

  • 422.
    Dejenfelt, Pontus
    Halmstad University, School of Business, Engineering and Science.
    Våtmarksfåglar i Stjärnarp, en inventering av nyanlagd våtmark utanför Halmstad, Halland2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    By doing a transect inventory combined with territory mapping at a recently constructed wetland in the area of Stjärnarp outside of Halmstad, during April-June in 2018, I have investigated species composition, species abundance and reproductive criteria shown by the bird species in the area. A comparison was made with five other wetlands in the county of Halland in matter of species composition and reproductive criteria to overlook if the age or area of the wetlands have an impact. After several visits in Stjärnarp, a total of 55 species of birds were recorded, of which 31 species were using the wetland area for reproduction, foraging or resting. Among all examined wetlands species richness varied more during 2018, when of different ages, compared to when they were about one year old. Overall analysis wasn’t significant for correlations, regressions or differences between the investigated variables of this study, though there were a significant correlation and regression between the amount of possibly reproductive species and the area of wetlands. According to others, characteristics of wetlands can have great impact on the presence of birds, e.g. size and age of wetlands, water depth, maintenance, location, presence of fish and more. According to this study, several reproductive species in particular have indicated attributes in Stjärnarp, e.g. early succession, nutrient rich waters, open meadows and more. Depending on what species or other biodiversity people which to benefit in the future, planning and continuous studies are needed here to find out if and how bird communities change with time, and to what causes.

  • 423.
    Demin, Mikhail
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Finite Volume Methods for Option Pricing2011Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
  • 424.
    Deng, Der-Jiunn
    et al.
    Department of Computer Science and Information Engineering, National Changhua University of Education, Changhua, Taiwan.
    Vinel, Alexey
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Atiquzzaman, Mohammed
    Department of Computer Science, The University of Oklahoma, Norman, OK, United States.
    Editorial: Recent Advances in Heterogeneous Networking for Quality, Reliability, Security and Robustness2017In: Journal on spesial topics in mobile networks and applications, ISSN 1383-469X, E-ISSN 1572-8153, Vol. 22, no 1, p. 1-3Article in journal (Other academic)
  • 425.
    Denkiewicz, Sonia
    Halmstad University, School of Business and Engineering (SET).
    Ambient noise levels or single noise events at night in urban neighbourhoods: What causes sleep disturbance?2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Traffic noise exposure is a constant problem even though some measures against it are taken. It causes disturbances both during the day but also during the night when people are sleeping. A literature review, that was part of this thesis, showed that adverse response to noise from railways is more severe that from the main roads on sleep nighttime. Furthermore, exposure of noise from freight trains has a higher negative effect than that from passenger trains. The main adverse effects that have been found in these studies are on the sleep parameters and the cardiovascular system.

    A study made by Pedersen (2012) showed that there are some areas in the city Halmstad in Sweden where people are especially disturbed by traffic noise during their sleep nighttime. The aim of the study presented in this thesis was to find out if there is a connection between peoples’ reports of noise disturbance during sleep nighttime and the actual noise exposure. Two modes of measurements have been taken in three of the residential areas from the study by Pedersen (2012) which was Area H close to the harbour, Area MW close to the motorway E6/E20 and Area R close to the railway. The two modes of measurements were A-weighted equivalent sound pressure levels, representing ambient noise levels, and A-weighted maximum sound pressure levels, representing single noise events. These modes were used to identify the possible cause of sleep disturbance by the type of noise exposure. For ambient noise levels, 10 measurements at two occasions, each one minute long, were carried out during the same night at 23:00-24:00 and 03:00-04:00. These specific times have been chosen to obtain the traffic noise exposure when people go to sleep and when their sleep is very deep. Single noise events were measured when the harbour, motorway and railway were used nighttime. The Swedish Transport Administration and Halmstad Harbour were contacted for information on possible exposure times.

    The results show a relationship between peoples’ reported sleep disturbance nighttime and the exposure to single noise events. The highest maximum noise levels were measured in the area close to the railway which exceeded the recommended guidelines 55dB(A) outside the facades nighttime that have been set up by the World Health Organization. There was no connection found for the ambient noise levels and peoples’ reported sleep disturbance. The highest equivalent sound pressure levels were found in the area close to the motorway. The study in this thesis confirms the results from previous studies that show that railway noise have a higher effect on sleep than road traffic noise. It has been shown in other studies but also in this study that the highest noise exposure comes from freight trains. There has not been found any previous studies that investigate the possible relationship between sleep disturbance and noise coming from the harbour and no single noise events could be measured in the area close to the harbour in the current study.

    The conclusions are that the single noise events have higher negative effects especially at higher noise exposures. More studies should be made in this area to find the connection between noise exposure, sleep disturbance and long-term health effects. The focus should be on long-term studies and more studies should also be made on the noise exposure from harbours.

  • 426.
    Denkiewicz, Sonia
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Goral, Aleksandra
    Halmstad University, School of Business and Engineering (SET).
    Genomgång av kemikalieförteckning som exempel på uppströmsarbete: en identifiering av utfasningsämnen i spillvattnet2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 427.
    Dennis Wilson, Dennis
    Halmstad University, School of Business, Engineering and Science.
    Estimation of Carbon Dioxide emissions from forest soils based on CO2 concentrations2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Forest soil is an important source of atmospheric CO2. Emission of CO2 from soil is the result of respiration of plant roots and soil organisms (Autotrophic and Heterotrophic respiration). This soil CO2 emission has a variation throughout the year with maximum emissions being in the summer. However, the seasonal variation affected by the external factors is not fully known. The aim of this thesis is to analyze a relationship between concentration of CO2 in the soil-atmosphere and CO2 emissions to the aboveground atmosphere. When knowing the relationship between CO2 concentration in the soil-atmosphere and the emission of CO2 from the soil atmosphere, a function (equation) can be established. Usually, the best fit is considered to establish the relationship. With the equations obtained, it is possible to calculate CO2 emissions using data different projects, where only soil-atmosphere CO2 concentrations were determined. Using the relationships, emissions rates in different soil types and in forest transect have been analyzed for a large number of samples. The effect of nitrogen deposition on CO2 emissions and seasonal variation of CO2 emission has also been studied. The sampled sites chosen for this study were located in different parts of Southern Scandinavia and Germany. A closed chamber was used to measure CO2 emission from soil. Soil CO2 concentrations were measured at every station and the equations were established. Finally, these relationships were used for analyses and comparison of the sites. An equation (best fit) obtained was used to calculate the emission values of CO2. The soil texture had a great influence on the CO2 from the soil besides the atmospheric pressure and temperature variations during the seasons. It is concluded that, therefore the soil texture and had a great influence on the CO2 emission from the soil besides the atmospheric pressure and temperature variations during the season. When knowing the equation between CO2 concentration and emission for a special type of soil, it is possible to estimate emissions based on CO2 concentrations. Therefore large scale sampling of CO2 concentrations could be done and this will facilitate the inventories carried out in e.g. global change studies.

  • 428.
    Diao, Zhu
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Sauer, Vincent T. K.
    National Institute for Nanotechnology, Alberta, Canada; Department of Biological Sciences & Department of Electrical and Computer Engineering, University of Alberta, Alberta, Canada.
    Hiebert, Wayne K.
    National Institute for Nanotechnology, Alberta, Canada & Department of Physics, University of Alberta, Alberta, Canada.
    Integrated On-Chip Nano-Optomechanical Systems2017In: International Journal of High Speed Electronics and Systems, ISSN 0129-1564, Vol. 26, no 1-2, article id 1740005Article in journal (Refereed)
    Abstract [en]

    Recent developments in integrated on-chip nano-optomechanical systems are reviewed. Silicon-based nano-optomechanical devices are fabricated by a two-step process, where the first step is a foundry-enabled photonic circuits patterning and the second step involves in-house mechanical device release. We show theoretically that the enhanced responsivity of near-field optical transduction of mechanical displacement in on-chip nano-optomechanical systems originates from the finesse of the optical cavity to which the mechanical device couples. An enhancement in responsivity of more than two orders of magnitude has been observed when compared side-by-side with free-space interferometry readout. We further demonstrate two approaches to facilitate large-scale device integration, namely, wavelength-division multiplexing and frequency-division multiplexing. They are capable of significantly simplifying the design complexity for addressing individual nano-optomechanical devices embedded in a large array. © 2017 World Scientific Publishing Company.

  • 429.
    Diehl, Sebastian
    et al.
    Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden & Integrated Science Lab (IceLab), Umeå University, Umeå, Sweden.
    Thomsson, Gustaf
    Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden.
    Kahlert, Maria
    Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Guo, Junwen
    Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden.
    Karlsson, Jan
    Department of Ecology and Environmental Sciences, Umeå University, Umeå, Sweden.
    Liess, Antonia
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Inverse relationship of epilithic algae and pelagic phosphorusin unproductive lakes: Roles of N2 fixers and light2018In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 63, no 7, p. 662-675Article in journal (Refereed)
    Abstract [en]

    1. Phosphorus (P) often limits the biomass of primary producers in freshwater lakes. However, in unproductive northern lakes, where anthropogenic nitrogen (N) deposition is low, N instead of P can limit primary producers. In addition, light can be limiting to primary producers at high concentrations of coloured dissolved organic matter (cDOM), as cDOM is the major determinant of light penetration in these lakes.

    2. To address resource limitation of epilithic algal biomass, we repeatedly sampled epilithon (periphyton on stony substrata) in 20 lakes covering a large, correlated cDOM and N-deposition gradient across boreal and subarctic Sweden. Across these lakes, pelagic total N (TN) and total P (TP) were positively correlated, and benthic light supply was negatively correlated, with cDOM. Microscopically determined algal biovolume and epilithic carbon (C), N and P were subsequently regressed against benthic light supply and pelagic TN and TP.

    3. Patterns in epilithic biovolume were driven by N2-fixing cyanobacteria, which accounted for 2%–90% of total epilithic biovolume. Averaged over the growing season, epilithic algal biovolume, C and N were negatively related to TP and positively to TN, and were highest in the clearest, most phosphorus-poor lakes, where epilithon was heavily dominated by potentially N2-fixing cyanobacteria.

    4. A structural equation model supports the hypothesis that cDOM had two counteracting effects on total epilithic algal biovolume: a positive one by providing N to algae that depend on dissolved N for growth, and a negative one by shading N2-fixing cyanobacteria, with the negative effect being somewhat stronger.

    5. Together, these findings suggest that (1) light and N are the main resources limiting epilithic algal biomass in boreal to subarctic Swedish lakes, (2) epilithic cyanobacteria are more competitive in high-light and low-nitrogen environments, where their N2-fixing ability allows them to reach high biomass, and (3) epilithic N increases with N2 fixer biomass and is—seemingly paradoxically—highest in the most oligotrophic lakes. © 2018 John Wiley & Sons Ltd

  • 430.
    Dillon, Tharam
    et al.
    Curtin University of Technology, Bentley, Australia.
    Parashar, Manish
    Rutgers University, New Jersey, USA.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Chen, Guolong
    Suzhou University, Jiangsu Sheng, China.
    Zomaya, Albert
    University of Sydney, Sydney, Australia.
    Pan, Yi
    Georgia State University, Georgia, USA.
    Message from U-Science 2014 general chairs2014In: 2014 IEEE 12th International Conference on Dependable, Autonomic and Secure Computing, Piscataway: IEEE, 2014, article id 6945646Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.© 2014 IEEE

  • 431.
    Dimkovski, Zlate
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Bååth, Lars
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Fotonik och mikrovågsteknik. Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Stefan
    Toponova AB.
    Ohlsson, Robert
    Volvo Powertrain.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Interference Measurements of Deposits on Cylinder Liner Surfaces2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 270, no 3-4, p. 247-251Article in journal (Refereed)
    Abstract [en]

    The accumulation of deposits in the honing grooves of the cylinder liner surfaces of internal combustion engines is undesirable as they seal the grooves (reducing their oil retention capability) and increase engine's oil consumption. As part of a long-term programme of truck engine development, after different running times and under similar conditions of load, engine speed and lubrication, a number of grey iron cylinder liners were axially sectioned, measured, inspected and a presence of deposits was discovered. These deposits were characterised in order to gain knowledge about their origin and quantities. The X-ray energy dispersive analysis revealed elements stemming from the oil/fuel (C, O and S), from the detergent (Ca and Mg), from the anti-wear additive (Zn and P), and from some contaminants (K and Si). Higher concentration of S and Ca were mostly found in the honing grooves covered with deposits suggesting a domination of the detergent additive. Deposit thickness measurements obtained by a white light interferometer revealed patchy deposit topographies concentrated at the top region reducing towards the bottom of the liner which was also confirmed by scanning electron microscope measurements. Despite the limitations of the interferometer, it has been shown that the interference measurements are sufficiently reliable for a quick and objective quantification of the overall deposit accumulation.

  • 432. Ding, Lu
    Simulating Pollutant Removal in LID (Low-Impact Development) Facilities with SWMM (Storm Water Management Model)2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the 1990s, the United States proposed a new rainwater management pattern called low-impact development (LID) to alleviate the increasingly serious urban non-point source pollution caused by urbanization. With the wide acceptance of the LID concept, stormwater management model (SWMM) developed by United States Environmental Protection Agency (US EPA) in 1970s, which can simulate the effects of LID facilities in its newest version, is gaining more applications in urban planning. With China's LID- based sponge city construction concept, SWMM has also been widely used in China. So, the study of the reliability and limitations of SWMM model simulation is very important. This study focusses on simulation of pollutant removal in LID facilities. I selected four experimental studies and built models based on the data presented in these studies. After that, the simulation results of the model were compared with the experimental results in the paper. The Wilcoxon signed rank test in the SPSS was used to analyze the reliability. The analysis showed that there is no significant difference between the model simulation results and the experimental results (0.689>0.05), indicating that the model is generally reliable. However, the high requirements of the model for parameter calibration and low flexibility lead to the limitations of the model. At present, the practical experience and theoretical research on the application of LID facilities simulation in SWMM are relatively weak, and further research is needed.

  • 433.
    Djupsjöbacka, Helene
    Halmstad University.
    Elektroniska journalsystem och informationsdelning: En studie om vilka utmaningar som påverkar tillgången till patientinformation från olika journalsystem2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 434.
    Doeleman, S.
    et al.
    MIT Haystack Observatory, Westford, MA, USA.
    Rogers, A.E.E.
    MIT Haystack Observatory, Westford, MA, USA.
    Bååth, L.B.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Schalinski, C.
    Institut de Radioastronomie Millimétrique, Grenoble, France.
    Krichbaum, T.
    Max Planck Institut für Radioastronomie, Bonn, Germany.
    Inoue, M.
    Nobeyama radio Observatory/NAO, Minamimaki, Nagano, Japan.
    Zensus, A.
    National Radio Astronomy Observatory, Socorro, NM, USA.
    Padin, S.
    Owens Valley Radio Observatory, CA, USA.
    Carlstrom, J.
    Owens Valley Radio Observatory, CA, USA.
    Graham, D.
    Max Planck Institut für Radioastronomie, Bonn, Germany.
    Predmore, C.
    Five College Radio Astronomy Observatory, Amherst, MA, USA.
    Moran, J.
    Smithsonian Astrophysical Observatory, Cambridge, MA, USA.
    Backer, D.
    Radio Astronomy Labratory, Berkeley, CA, USA.
    Wright, M.
    Radio Astronomy Labratory, Berkeley, CA, USA.
    Whyborn, N.
    European Southern Observatory, Santiago, Chile.
    Nyman, L.
    European Southern Observatory, Santiago, Chile.
    Standke, K.
    Max Planck Institut für Radioastronomie, Bonn, Germany.
    Lerner, M.
    Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.
    Kameno, S.
    Nobeyama radio Observatory/NAO, Minamimaki, Nagano, Japan.
    86 GHz Global VLBI Progress Report1993In: VLBI Technology: Progress and Future Observational Possibilities: Proceedings of the International Symposium Held at Kyoto International Conference Hall on September 6-10, 1993 / [ed] Tetsuo Sasao, Seiji Manabe, Osamu Kameya & Makoto Inoue, Tokyo: Terrapub , 1993, p. 89-92Chapter in book (Refereed)
  • 435.
    Dolšak, Petra
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science.
    SOURCE SPECIFIC FOG DEPOSITION OF BLACK CARBON FROM THE ATMOSPHERE2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Black carbon (BC) plays an important part in global climate change. In addition, long term exposure to BC is closely related to pulmonary and cardiovascular mortality. BC is formed by the incomplete combustion of carbonaceous compounds. In urban environments the main sources come from the burning of biomass for domestic heating and diesel vehicles. The typical lifespan of airborne BC is about a week and is treated as a short-lived climate pollutant. Wet deposition, which is more significant closer to the source, is the primary deposition mechanism and condensation of water is dependent on the sources of BC. Measurements with aethalometers determine the sources of BC concentrations, particularly fossil fuel combustion from traffic (ff) and wood smoke (bb).

     

    The in-situ measurements in this study reveal that the different source apportionment of BC emissions with different initial properties of BC behaves differently during the fog periods. Foggy periods from the March and January 2015 data set were carefully collected. In January, the fog occurred throughout the entire observation time, while in March the fog occurred for different durations, from 1 to 7 hours. A linear regression between the normalized BC, BCbb, BCff concentrations and 7-hour periods at night was calculated for each individual period. The comparison of slope values (k), standard errors and p-values of different sources of specific BC emissions was then made. Despite there not being a great difference between the slope values of BCbb and BCff in the January data set, the results revealed that BC emissions from biomass burning have fewer non-statistically significant values than the BC emissions from vehicle exhaust. This study corresponds to the different initial properties of fresh aerosols from both sources and indicated an increased fog deposition of BC from biomass burning.

  • 436.
    Domeij Hilliges, Isak
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Stendahl, Cecilia
    Halmstad University, School of Business and Engineering (SET).
    Ocean acidification effects on marine organisms: a study of Littorina littorea and Balanus improvisus 2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The world’s oceans are becoming more acid in a process called ocean acidification. The pH of the ocean have already decreased by 0.1 units from pre-industrial time until today. Scientists predict that by the year of 2100 the pH will decrease by as much as 0.4 units. This is a big potential problem to many marine species, because they have developed in such a stable environment that has not changed for millions of years. It is difficult to predict how they might be affected by such a decrease in pH during a relatively short time period. Several studies have been made on marine species exposed to decreased pH-levels, the results showed changes in their physiology but it is hard to predict how these changes will affect the organism in a long-term scale and if this might change ecosystem dynamics. Our study measured the activity of Littorina littorea and Balanus improvisus when exposed to lower pH, the results of our study showed an increase in activity for the lower pH (pH 6.0-7.5) when compared to the control (~pH8). The area of ocean acidification is a field that requires further studies to fully understand its effects on the marine ecosystems and the species within it.

  • 437.
    Dremkova, Ekaterina
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    A high order compact method for nonlinear Black-Scholes option pricing equations with transaction costs2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this work we consider the nonlinear case of Black-Scholes equation and apply it to American options. Also, method of Liao and Khaliq of high order was applied to nonlinear Black-Scholes equation in case of American options. Here, we use this method oh fourth order in time and space to raise American option price accuracy.

  • 438.
    Dubell, Michael
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Johansson, David
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Nätverkssäkerhet med IPS: Förbättrad nätverkssäkerhet med Intrusion Prevention Systems2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Att skydda sin IT-miljö mot olika typer av intrång och attacker som till exempel trojaner,skadliga Java applets eller DoS attacker med hjälp av brandväggar och antivirusprogramär två viktiga lager i skalskyddet.

    I den här uppsatsen undersöks hur väl ett Intrusion Prevention System skulle kunna fungera som ett ytterligare lager i skalskyddet. Fokus ligger på hur väl IPS-systemet klarar av att avvärja attacker, hur mycket tid som går åt till konfigurering och drift för att få ett fungerande IPS samt hur prestandan i nätverket påverkas av implementationen. För att mäta hur väl IPS systemet klarar av att upptäcka och blockera attacker utförs två experiment där ett mindre nätverk attackeras på olika sätt. I det första experimentet skyddas infrastrukturen av en brandvägg och klienterna är utrustade med antivirusprogram. I det andra experimentet genomförs samma attacker igen fast med ett Snort IPS implementerat i nätverket.

    Resultatet av de genomförda experimenten visar att en IPS klarar att blockera ca 87% av attackerna, men nätverksprestandan påverkas negativt. Slutsatsen är att endast brandväggar och antivirusprogram inte ger ett fullgott skydd.

  • 439.
    Duc, Benoıt
    et al.
    Motorola, Inc., Geneva, Switzerland.
    Fischer, Stefan
    FASTCOM Technology, S.A., Lausanne.
    Bigun, Josef
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Face authentication with Gabor information on deformable graphs1999In: IEEE Transactions on Image Processing, ISSN 1057-7149, E-ISSN 1941-0042, Vol. 8, no 4, p. 504-516Article in journal (Refereed)
    Abstract [en]

    Elastic graph matching has been proposed as a practical implementation of dynamic link matching, which is a neural network with dynamically evolving links between a reference model and an input image. Each node of the graph contains features that characterize the neighborhood of its location in the image. The elastic graph matching usually consists of two consecutive steps, namely a matching with a rigid grid, followed by a deformation of the grid, which is actually the elastic part. The deformation step is introduced in order to allow for some deformation, rotation, and scaling of the object to be matched. This method is applied here to the authentication of human faces where candidates claim an identity that is to be checked. The matching error as originally suggested is not powerful enough to provide satisfying results in this case. We introduce an automatic weighting of the nodes according to their significance. We also explore the significance of the elastic deformation for an application of face-based person authentication. We compare performance results obtained with and without the second matching step. Results show that the deformation step slightly increases the performance, but has lower influence than the weighting of the nodes. The best results are obtained with the combination of both aspects. The results provided by the proposed method compare favorably with two methods that require a prior geometric face normalization, namely the synergetic and eigenface approaches

  • 440.
    Duracz, Adam
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Rigorous Simulation: Its Theory and Applications2016Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Designing Cyber-Physical Systems is hard. Physical testing can be slow, expensive and dangerous. Furthermore computational components make testing all possible behavior unfeasible. Model-based design mitigates these issues by making it possible to iterate over a design much faster. Traditional simulation tools can produce useful results, but their results are traditionally approximations that make it impossible to distinguish a useful simulation from one dominated by numerical error. Verification tools require skills in formal specification and a priori understanding of the particular dynamical system being studied.

    This thesis presents rigorous simulation, an approach to simulation that uses validated numerics to produce results that quantify and bound all approximation errors accumulated during simulation. This makes it possible for the user to objectively and reliably distinguish accurate simulations from ones that do not provide enough information to be useful. Explicitly quantifying the error in the output has the side-effect of leading to a tool for dealing with inputs that come with quantified uncertainty.

    We formalize the approach as an operational semantics for a core subset of the domain-specific language Acumen. The operational semantics is extended to a larger subset through a translation. Preliminary results toward proving the soundness of the operational semantics with respect to a denotational semantics are presented. A modeling environment with a rigorous simulator based on the operational semantics is described. The implementation is portable, and its source code is freely available. The accuracy of the simulator on different kinds of systems is explored through a set of benchmark models that exercise different aspects of a rigorous simulator. A case study from the automotive domain is used to evaluate the applicability of the simulator and its modeling language. In the case study, the simulator is used to compute rigorous bounds on the output of a model.

  • 441.
    Duracz, Adam
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Bartha, Ferenc Ágoston
    Rice University, Houston, TX, USA.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Rice University, Houston, TX, USA.
    Accurate Rigorous Simulation Should be Possible for Good Designs2016In: Proceedings of the 2016 International Workshop on Symbolic and Numerical Methods for Reachability Analysis (SNR) / [ed] Erika Ábrahám & Sergiy Bogomolov, Piscataway, NJ: IEEE conference proceedings, 2016, article id 7479376Conference paper (Refereed)
    Abstract [en]

    The development of Cyber-Physical Systems benefits from better methods and tools to support the simulation and verification of hybrid (continuous/discrete) models. Acumen is an open source testbed for exploring the design space of what rigorous-but-practical next-generation tools can deliver to developers. Central to Acumen is the notion of rigorous simulation. Like verification tools, rigorous simulation is intended to provide guarantees about the behavior of the system. Like traditional simulation tools, it is intended to be intuitive, practical, and scalable. Whether these two goals can be achieved simultaneously is an important, long-term challenge.

    This paper proposes a design principle that can play an important role in meeting this challenge. The principle addresses the criticism that accumulating numerical errors is a serious impediment to practical rigorous simulation. It is inspired by a twofold insight: one relating to the nature of systems engineered in the real world, and the other relating to how numerical errors in the simulation of a model can be recast as errors in the state or parameters of the model in the simulation. We present a suite of small, concrete benchmarks that can be used to assess the extent to which a rigorous simulator upholds the proposed principle. We also report on which benchmarks Acumen's current rigorous simulator already succeeds and which ones remain challenging.

  • 442.
    Duracz, Adam
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Eriksson, Henrik
    SP Technical Research Institute of Sweden, Borås, Sweden.
    Bartha, Ferenc Ágoston
    Rice University, Houston TX, USA.
    Zeng, Yingfu
    Rice University, Houston TX, USA.
    Xu, Fei
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Rice University, Houston TX, USA.
    Using Rigorous Simulation to Support ISO 26262 Hazard Analysis and Risk Assessment2015In: 2015 IEEE 12th International Conference on Embedded Software and Systems (ICESS) / [ed] Meikang Qiu, Yongxin Zhu, Daikai Zhu & Fengling Han, Piscataway, N.J.: IEEE Press, 2015, p. 1093-1096Conference paper (Refereed)
    Abstract [en]

    Rigorous simulation is a new technology that can play a key role in managing uncertainty in the design of safety-critical cyber-physical systems. One of its important applications is the analysis and evaluation of functional safety for road vehicles according to international standards such as ISO 26262. Previous work  presented preliminary evidence to support the feasibility of using rigorous simulation for this purpose. Here we report on advances in our implementation of rigorous simulation and show how they enable the rigorous simulation of more refined and more complete models. A larger case study highlights the benefits of these advances and helps us identify new challenges that should be addressed by future work. © 2015 IEEE.

  • 443. Duracz, Jan
    et al.
    Farjudian, Amin
    University of Nottingham Ningbo China, Ningbo, China.
    Konečný, Michal
    Aston University, Birmingham, United Kingdom.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Rice University, Houston, Texas, USA.
    Function Interval Arithmetic2014In: Mathematical software -- ICMS 2014: 4th International Congress, Seoul, South Korea, August 5-9, 2014. Proceedings / [ed] Hoon Hong & Chee Yap, Berlin, Heidelberg: Springer, 2014, p. 677-684Conference paper (Refereed)
    Abstract [en]

    We propose an arithmetic of function intervals as a basis for convenient rigorous numerical computation. Function intervals can be used as mathematical objects in their own right or as enclosures of functions over the reals. We present two areas of application of function interval arithmetic and associated software that implements the arithmetic: (1) Validated ordinary differential equation solving using the AERN library and within the Acumen hybrid system modeling tool. (2) Numerical theorem proving using the PolyPaver prover. © 2014 Springer-Verlag.

  • 444.
    Dzharayan, Gayk
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Voronova, Elena
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab.
    Pricing of exotic options under the Kou model by using the Laplace transform2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis we present the Laplace transform method of option pricing and it's realization, also compare it with another methods. We consider vanilla and exotic options, but more attention we pay to the two-asset correlation options. We chose the one of the modifications of Black-Scholes model, the Kou double exponential jump-diffusion model with the double exponential distribution of jumps, as model of the underlying stock prices development. The computations was done by the Laplace transform and it's inversion by the Euler method. We will present in details proof of finding Laplace transforms of put and call two-asset correlation options, the calculations of the moment generation function of the jump-diffusion by Levy-Khintchine formulae in cases without jumps and with independent jumps, and direct calculation of the risk-neutral expectation by solving double integral. Our work also contains the programme code for two-asset correlation call and put options. We will show the realization of our programme in the real data. As a result we see how our model complies on the NASDAQ OMX Stock-holm Market, considering the two-asset correlation options on three cases by stock prices of Handelsbanken, Ericsson and index OMXS30.

  • 445.
    Dzonlic, Muris
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Informationssökningsprocess på Internet i studiesituationer2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsen presenterar hur högskolestudenter och gymnasieelever av båda könen (killar respektive tjejer) hanterar informationssökning och källkritik på Internet i samband med studier. Syftet med studien är att se skillnader och likheter i tre sökaspekter (informationsbehov, sökstrategi och källkritik). Sedan vill jag se hur tre sökaspekter används av båda könen bland högskolestudenter och gymnasieelever. Undersökningen är en både kvantitativ och kvalitativ studie. Det kvantitativa inslaget bygger på enkätfrågor och öppna frågor medan det kvalitativa inkluderar intervjufrågor. Teoretisk referensram består av litteratur och vetenskapliga artiklar som ger teoretiskt stöd åt ett operationaliseringsschema och ger grund åt hela studien. Studien begränsas till högskolestudenter och gymnasieelever av båda könen som går medieinriktade studier, oberoende av årskursnivå. Ett oväntat resultat som studien visade är, att både högskolestudenter och gymnasieelever av båda könen tittar mest på sina träffar ”Till mitten pålistan”. I studien upptäcktes att högskolestudenter och gymnasieelever av båda könen har kunskap om källkritik, men det stora problemet hos båda grupperna är ”Tidsbrist” och ”Har inte lust”, så att de undviker granska källor på Internet. Högskolestudenter och gymnasieelever av båda könen är medvetna om konsekvenserna som kan uppstå om de inte kritisk granskar källor på Internet. Det sökmönster som högskolestudenter och gymnasieelever av båda könen använder är att de först söker med bred sökning och sedan med smal sökning. Deras val av sökverktyg är ”Google” och de söker mest med sökord.

  • 446.
    Eagen, Ward M.
    et al.
    Ryerson University Toronto, Ontario M5B 2K3 Canada.
    Ngwenyama, Ojelanki K.
    Ryerson University Toronto, Ontario M5B 2K3 Canada.
    Prescod, Franklyn
    Ryerson University Toronto, Ontario M5B 2K3 Canada.
    The Design Charrette in the Classrooms as a Method for Outcomes-based Action Learning in IS Design2008In: Information Systems Education Journal, ISSN 1545-679X, Vol. 6, no 19Article in journal (Refereed)
    Abstract [en]

    This paper explores the adaptation of a traditional studio technique in architecture – the Design Charrette – to the teaching of New Media design in a large information systems program. The Design Charrette is an intense, collaborative session in which a group of designers drafts a solution to a design problem in a time critical environment. The Design Charrette offers learning opportunities in a very condensed period that are difficult to achieve in the classroom by other means and we have adapted its application from the architecture studio to for New Media instruction. The teaching of information systems has tended to rely heavily on conventional pedagogical approaches although there is growing recognition of the importance of experiential and applied learning. Ac- creditation standards have also placed added emphasis on outcome-based learning and encouraged more mindfulness concerning instructional design (Lee et. al., 1995; McGourty et. al., 1999). As a consequence, more emphasis on experiential learning has emerged in recent years. Architecture has long been used as a reference discipline for Information Systems and much of the language used in information systems design is drawn from architectural discourse. However, while architectural design combines attention to history and form as well as function, most information systems design is driven by functional considerations. Teaching New Media design, like architecture, demands at- tention to the conceptual and aesthetic as well as the functional design perspectives and presents particular challenges. The Design Charrette, a short but intense effort to solve an architectural problem is an outcome focused form of action learning that has enormous potential to enrich the teaching of New Media design, in particular, and information systems in general.

  • 447.
    Ebbesson, Esbjörn
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Facilitating Distributed Multi-stakeholder Co-creative Innovation Processes– A Case from the Media Industry2012In: IRIS: Selected Papers of the Information Systems Research Seminar in Scandinavia / [ed] Judith Molka-Danielsen, Christina Keller & Mikael Wiberg, Trondheim: Akademika forlag, 2012, Vol. 3, p. 69-82Conference paper (Refereed)
    Abstract [en]

    Facilitating distributed co-creative activities within an innovation process involving multi-stakeholder perspectives such as diverse user groups, designers and organizational representatives is a challenging task. The distance on a conceptual level between participants has the potential to lead to both barriers and opportunities for co-creative activities, while also changing the role of the facilitator. The paper aim to explore this phenomenon further through the research question: How can facilitators work towards bridging conceptual distance between stakeholders in distributed multi-stakeholder co-creative innovation processes?’

    The researcher investigated the work of facilitators within a co-creative innovation process of user generated content services with the media industry through a case study. A theoretical framework centered around communities of practice and boundary spanning were used to gain an understanding of the facilitators work. The study concludes that the development of a shared language, use of boundary objects to aid translation and outer-level brokering before and during innovation activities are important processes that a facilitator use to decrease conceptual distance.

  • 448.
    Ebbesson, Esbjörn
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Fragmented Digital Infrastructures: The case of Social (News) Media2015In: 21st Americas Conference on Information Systems (AMCIS 2015), Red Hook, NY: Curran Associates, Inc., 2015, p. 1172-1182Conference paper (Refereed)
    Abstract [en]

    Digitization and contemporary use of social media platforms is changing how we perceive and use IT, both in organizations and as citizens or consumers. These developments have also transformed and changed many industries, bringing both opportunities and challenges. One industry that was affected by digitization relatively early is the media industry, leading to studies on online journalism, gatekeeping, reader interaction and other changing practices enabled by IT.

    This study attempts to highlight the IT infrastructure behind the changing practice to understand the relationship between the IT and the use. Through an online ethnography, this paper investigates the use of social media platforms in the newspaper industry. The findings indicate that newspapers either use an integration strategy, where they relinquish control over the feature to the social media platform, or an appropriation strategy where they take the integration a step further, to have the social media platform work for them. 

  • 449.
    Ebbesson, Esbjörn
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Bergquist, Magnus
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Dancing in the Dark: Social Media Tactics in the News Industry2016In: The 10th Mediterranean Conference on Information Systems, MCIS 2016, Paphos, Cyprus, September 4-6, 2016, 2016, article id 20Conference paper (Refereed)
    Abstract [en]

    The news media ecosystem has expanded over the years leading up to today’s society to include advertisers, newspapers and other media houses, content producers, along with new players like social media platforms to together form a value packed mix of services for end-users to embrace. The shift from being a dominant platform owner concerning the printed paper, often with its own distribution network, presents the newspaper with many challenges when transforming into, or entering other platform owners’ ecosystems. While previous research has mainly focused on the newspaper industry’s development of strategies for embracing social media into their ecosystem, this study investigates newspaper workers’ social media usage for the purpose of attracting attention and generating value. The study of newspaper workers’ practices shows that, moving into digital platforms controlled by other dominant actors in the ecosystem, workers enact a tactical approach. Two tactics are identified: adaption and exploitation. The paper contributes with empirical insights into how newspaper workers develop practices to embrace social media that goes beyond previous research on social media strategy. We also apply the theory of everyday tactics developed by Michel de Certeau as a scaffold to theorize newspaper positioning in the rapidly changing news media landscape.

  • 450.
    Ebbesson, Esbjörn
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Ihlström Eriksson, Carina
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    A User Driven Design Approach to Creating UGC Services – Challenging the Newspaper Industry2013In: Human Interface and the Management of Information Information and Interaction Design: 15th International Conference, HCI International 2013 Las Vegas, NV, USA, July 2013 Proceedings, Part I / [ed] Sakae Yamamoto, Berlin: Springer Berlin/Heidelberg, 2013, Vol. 8147, p. 187-196Conference paper (Refereed)
    Abstract [en]

    This paper presents a user driven approach to creating user generated content services together with newspaper representatives and researchers in a Living Lab setting. Two cases are discussed, one with creating city district blogs and one with creating a site for un-employed youth. In each case both situated and distributed design activities were conducted, and the paper discusses the challenges with this approach. As the newspaper industry traditionally designs their services in-house from their own ideas and thereafter tests them with their readers, a user driven approach by readers was very challenging. However, the newspaper representatives also found it rewarding to embrace their ideas. The participating readers were very active in the situated activities but only a few continued the same activity online. The paper concludes by proposing a model for how to view the changing role of a researcher or facilitator in these types of setting. © 2013 Springer-Verlag Berlin Heidelberg.

6789101112 401 - 450 of 1877
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf