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  • 46701.
    Xu, Damiao
    et al.
    Karlstad University, Division for Business and Economics.
    Yang, Duo
    Karlstad University, Division for Business and Economics.
    The Influence of Corporate Social Responsibility Initiatives on University Students' Buying Behavior2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 46702. Xu, Jianqiang
    et al.
    Yang, Qing
    Qian, Xuhong
    Samuelsson, Jörgen
    Uppsala University.
    Janson, Jan-Christer
    Uppsala University.
    Assessment of 4-nitro-1,8-naphthalic anhydride reductase activity in homogenates of bakers’ yeast by reversed-phase high-performance liquid chromatography2007In: Journal of chromatography. B, ISSN 1570-0232, E-ISSN 1873-376X, Vol. 847, no 2, p. 82-87Article in journal (Refereed)
  • 46703.
    Xu, Yingzi
    et al.
    Auckland University of Technology, New Zealand.
    Marshall, Roger
    Auckland University of Technology, New Zealand.
    Edvardsson, Bo
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Service Research Center. Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School.
    Tronvoll, Bård
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Service Research Center. Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School.
    Show you care: initiating co-creation in service recovery2014In: Journal of Service Management, ISSN 1757-5818, E-ISSN 1757-5826, Vol. 25, no 3, p. 369-387Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to explore the underlying mechanism of customer co-creation in service recovery (co-recovery), and investigates the impact of initiation on customer post-recovery evaluations and behavioural intentions.

    Design/methodology/approach – Researchers used a 3 (no co-recovery vs employee-initiated co-recovery vs customer-initiated co-recovery)×2 (male vs female)×2 (western vs eastern customers) between-subject experiential study in a hotel setting.

    Findings – When a service employee initiates a co-recovery, customers perceive higher justice, greater satisfaction and a higher tendency to repurchase in the future. But if the customer initiates such a co-recovery, little improvement on these outcomes is found compared to a recovery entirely managed by the company. The effect was moderated by culture: western customers were more sensitive to initiation in the co-recovery process than eastern customers.

    Research limitations/implications – Written scenarios using a hotel setting and a technical error were used, and may reduce the applicability of the findings to real life or other service categories or types of error. Subjects used may not be representative of other population groups. Further studies using real life situations, human error and a more diverse population group are recommended.

    Practical implications – A positive co-recovery can be achieved by service employees taking initiatives when a problem occurs.

    Originality/value – This study extends previous research on co-recovery by investigating the effect of initiation by service employees on customers’ perception of co-creation. Service companies can improve customers’ post-recovery evaluations by inviting them to co-create a feasible solution, and potentially reduce the company's compensation costs.

  • 46704.
    Xu, Yingzi
    et al.
    Auckland university, New Zealand.
    Tronvoll, Bård
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Service Research Center. Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School. Hedmark university college.
    Edvardsson, Bo
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Service Research Center. Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School.
    Recovering service failure through resource integration2014In: Service Industries Journal, ISSN 0264-2069, E-ISSN 1743-9507, Vol. 34, no 16, p. 1259-1271Article in journal (Refereed)
    Abstract [en]

    Customers and employees can co-create a resolution following a service failure through integrating their resources. Their activities and interactions during resource-integration shape the customers' service recovery experiences. Prior research overlooks resource integration between all involved actors in a co-created service recovery process. This research details the process with two empirical studies. Study 1 is a qualitative analysis of narratives of service recovery experiences; Study 2 is a quantitative assessment of scenario-based survey data. The results show that a favourable service recovery experience is resulted from integrating all involved actors' resources in a mutually beneficial manner. Three key resources are financial compensation, service skills including communication and timing. Our findings indicate that co-created service recovery fails in the absence of just one resource or mismatches in their integration. The combined studies reveal that customers use their justice perceptions to assess activities and interactions for resource integration in service recovery.

  • 46705. Yadoitsev, Igor
    et al.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Technology and Science, Materials Science. Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
    Yadroitsava, Ina
    Hierarchical design principles of selective laser melting for high quality metallic objects2015In: Additive manufacturing, ISSN 2214-8604, Vol. 7, p. 45-56Article in journal (Refereed)
  • 46706. Yadroitsev, I
    et al.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
    Yadroitsava, I
    Selective laser melting of Ti6Al4V alloy for biomedical applications: Temperature monitoring and microstructural evolution2014In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 583, p. 404-409Article in journal (Refereed)
  • 46707.
    Yadroitsev, I.
    et al.
    Cent Univ Technol, Dept Mech & Mechatron Engn, ZA-9300 Bloemfontein, Free State, South Africa.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
    Yadroitsava, I.
    Cent Univ Technol, Dept Mech & Mechatron Engn, ZA-9300 Bloemfontein, Free State, South Africa.
    Du Plessis, A.
    Univ Stellenbosch, CT Scanner Facil, ZA-7602 Stellenbosch, South Africa.
    Qualification of Ti6Al4V ELI Alloy Produced by Laser Powder Bed Fusion for Biomedical Applications2018In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 70, no 3, p. 372-377Article in journal (Refereed)
    Abstract [en]

    Rectangular Ti6Al4V extralow interstitials (ELI) samples were manufactured by laser powder bed fusion (LPBF) in vertical and horizontal orientations relative to the build platform and subjected to various heat treatments. Detailed analyses of porosity, microstructure, residual stress, tensile properties, fatigue, and fracture surfaces were performed based on x-ray micro-computed tomography, scanning electron microscopy, and x-ray diffraction methods. The types of fracture and the tensile fracture mechanisms of the LPBF Ti6Al4V ELI alloy were also studied. Detailed analysis of the microstructure and the corresponding mechanical properties were compared against standard specifications for conventional Ti6Al4V alloy for use in surgical implant applications. Conclusions regarding the mechanical properties and heat treatment of LPBF Ti6Al4V ELI for biomedical applications are made.

  • 46708.
    Yadroitsev, I
    et al.
    Université de Lyon, France.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Technology and Science, Materials Science. Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
    Yadroitsava, I
    Université de , France.
    Johansson, S
    Linköpings universitet.
    Smurov, I
    Université de Lyon.
    Energy input effect on morphology and microstructure of selective laser melting single track from metallic powder2013In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 213, no 4, p. 606-613Article in journal (Refereed)
  • 46709.
    Yadroitsev, Igor
    et al.
    South Africa.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
    Yadroitsava, I.
    South Africa.
    A systematic approach to manufacturing parts with desired properties by selective laser melting2015In: Materials Science and Technology Conference and Exhibition 2015, MS and T 2015, Association for Iron and Steel Technology, AISTECH , 2015, Vol. 1, p. 121-128Conference paper (Refereed)
    Abstract [en]

    Selective laser melting (SLM) is becoming a powerful additive manufacturing technology for different industries: automotive, medical, chemical, aerospace, etc. The extension of applications requires a wide spectrum of powder materials with specific properties. To produce parts with tailored properties by SLM, optimal process-parameters and scanning strategies have to be used for different powders. Numerical simulation allows the estimation of temperature distribution during laser melting and prediction the final microstructures and properties of SLM object. A hierarchical approach, including systematic analysis of SLM parameters necessary to control the final product quality on every level - track, layer, 3D object is suggested and discussed. A series of single tracks, layers and 3D objects were manufactured from metal powders to validate a proposed algorithm. The efficiency of the approach was illustrated by the manufacturing of fully dense samples from AISI 420 stainless steel.

  • 46710.
    Yadroitsev, Igov
    et al.
    Department of Mechanical and Mechatronic Engineering, Bloemfontein, Central University of Technology, Free State, South Africa.
    Krakhmalev, Pavel
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
    Yadroitsava, Inna
    Department of Mechanical and Mechatronic Engineering, Bloemfontein, Central University of Technology, Free State, South Africa.
    Du Plessis, Anton
    University of Stellenbosch.
    Qualification of DMLS Ti6Al4V (ELI) alloy for biomedical applications2017In: Proceedings of the 28th Annual International Solid Freedom Fabrication symposium – an Additive Manufacturing conference 2017 / [ed] David L. Bourell, Richard H. Crawford, Carolyn C. Seepersad, Joseph J. Beaman & Scott Fish, Austin: University of Texas , 2017Conference paper (Refereed)
  • 46711.
    Yafele, Anki
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Political, Historical, Religious and Cultural Studies (from 2013).
    Musik, förändring och framtidsdrömmar: En kvalitativ studie av det sydafrikanska musikutbildningsprojektet, Acess Music Project2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is an examination of how a music education that is run by a NGO, Non Governmental Organisation, in South Africa works. The organisation Arkwork for Art NPC, and their artistic programme Access Music Project, AMP, based in Grahamstown in Eastern Cape province, works as an case study. This study shows what different opportunities and challenges are of the work with the project and describes who the young participants enrolled in the project are and how they experience the music education. Further more this work explore the relationship between music education and social justice.

    Information was gathered through qualitative semi-structured interviews with the participants and project founder and leadership of the project. Partly information also was gathered through unstructured observations. The result shows that Arkwork for Art is filling an important gap where the government lack resources to offer music education for youth in marginalised communities. The organisation struggle with many things, most difficult for them is to get stable funding. AMP have many big future plans and want for instance to change the curriculum of music education in the future. My examination shows that the participants are very satisfied to be a part of AMP and that the project has an important role in their lifes and the community where they are based.

  • 46712.
    Yaghoubi, Saba Tahaei
    et al.
    Aalto University, Finland.
    Mousavi, S. Mahmoud
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics. Aalto University, Finland.
    Paavola, Juha
    Aalto University, Finland.
    Size effects on centrosymmetric anisotropic shear deformable beam structures2017In: Zeitschrift für angewandte Mathematik und Mechanik, ISSN 0044-2267, E-ISSN 1521-4001, Vol. 97, no 5, p. 586-601Article in journal (Refereed)
    Abstract [en]

    In this paper, the size effect on beam structures with centrosymmetric anisotropy is studied within strain gradient elasticity theory. Applying dimension reduction to the three dimensional anisotropic gradient elasticity, the third-order shear deformable (TSD) beam is analysed. A variational approach is used to determine the equilibrium equations of TSD beam together with consistent (classical and non-classical) boundary conditions. The TSD beam theory which is suitable for deep beam structures can be replaced by (less complicated) Euler-Bernoulli beam model for thin beam structures. The anisotropic Euler-Bernoulli beam model is also formulated within the framework of strain gradient theory. This anisotropic beam theory can be used to study size effects for any types of centrosymmetric anisotropy. To address the more practical cases of composite structures, the formulation is simplified for orthotropic and transversely isotropic materials. Finally, the analytical solutions are provided for bending of simply supported (TSD and Euler-Bernoulli) beams as well as clamped Euler-Bernoulli beams. The effect of the crystal orientation with respect to the beam geometry is investigated in these examples.

  • 46713.
    Yaghoubi, Saba Tahaei
    et al.
    Aalto University, Finland.
    Mousavi, S. Mahmoud
    Aalto University, Finland.
    Paavola, Juha
    Aalto University, Finland.
    Strain and velocity gradient theory for higher-order shear deformable beams2015In: Archive of applied mechanics (1991), ISSN 0939-1533, E-ISSN 1432-0681, Vol. 85, no 7, p. 877-892Article in journal (Refereed)
    Abstract [en]

    The strain and velocity gradient framework is formulated for the third-order shear deformable beam theory. A variational approach is applied to determine the governing equations together with initial and boundary conditions. Within the gradient framework, the strain energy is generalized to include strain as well as strain gradient. Furthermore, the kinetic energy is also generalized to include velocity and the velocity gradient. Such approach results in the introduction of the static and kinetic internal length scales. For dynamic analysis of beams, most of the gradient theories do not take the velocity gradient into account. The model developed in this paper depicts the influence of the velocity gradient on the governing equations and initial and boundary conditions of the third-order shear deformable theory. Through the assumption of the velocity gradients, kinematic quantities are distinguished on the microscale and on the macroscale. Finally, Timoshenko and Euler–Bernoulli beam theories are also presented by simplifying the third-order theory.

  • 46714.
    Yaghoubi, SabaTahaei
    et al.
    Aalto university, Finland.
    Mousavi, Mahmoud
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013). Aalto university, Finland.
    Paavola, Juha
    Aalto university, Finland.
    Buckling of centrosymmetric anisotropic beam structures within strain gradient elasticity2017In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 109, p. 84-92Article in journal (Refereed)
    Abstract [en]

    Buckling of centrosymmetric anisotropic beams is studied within strain gradient theory. First, the three dimensional anisotropic gradient elasticity theory is outlined. Then the dimension of the three dimensional theory is reduced, resulting in Timoshenko beam as well as Euler–Bernoulli beam theories. The governing differential equations together with the consistent (classical and non-classical) boundary conditions are derived for centrosymmetric anisotropic beams through a variational approach. By considering von Kármán nonlinear strains, the geometric nonlinearity is taken into account. The obtained nonlinear formulation can be used to study the postbuckling configuration. The analysis of size effect on anisotropic beam structures is missing in the literature so far, while the present model allows one to characterize the size effect on the buckling of the centrosymmetric anisotropic micro- and nano-scale beam structures such as micropillars. As a specific case, the governing buckling equation is obtained for the more practical case of orthotropic beams. Finally, the buckling loads for orthotropic simply supported Timoshenko and Euler–Bernoulli beams as well as a clamped Euler–Bernoulli beam are obtained analytically and the effect of the internal length scale parameters on the buckling load is depicted.

  • 46715. Yalcin, Ihsan
    Estimering av kapitalkostnad för onoterade företag2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The cost of capital for traded companies is basically assessed on information from thefinancial market. Small and non-traded companies are lack of this necessary financialmarket information in order to determine an appropriate equity risk premium and tocompute the cost of capital.In the absence of financial information necessary for an external investor, it is difficult toevaluate a non-traded company with the Capital Asset Pricing model (CAPM), which isbased on the financial market information. It measures only the systematic risk, which isthe contribution of one share to the market risk of a portfolio. It is therefore important tofind models that reflect the small and non-traded companies’ real business value and theirunique characteristics. The shortcomings of current models, such as CAPM, have led toattempts to develop new alternative models that can make a proper measure for theunlisted companies’ cost of capital. One such model is the AHP model (AnalyticalHierarchy Process) developed by Cotner & Fletcher (2000). The AHP model is based onthe fact that investors do not necessarily depended on financial market information inorder to mature a capital cost for the unlisted companies.The AHP model is based on the idea that the owners of unlisted traded companies do notsee their company as part of a well diversified portfolio. Therefore not only the systematicrisk should be considered for an appropriate estimation of the risk premium in the capitalcost. Capital cost should be based on total riskPurpose: To provide a comprehensive description, empirical testing and analysis of theAHP model to show how to estimate the cost of capital for untraded companies.Method: Data collection for this paper is based on secondary data which means data inthe form of articles and other relevant literature.Conclusion: It is difficult to believe that the AHP model can replace the CAPM and beused as an alternative model for the estimate cost of capital for both traded and nontraded companies. However, the model might be used by non-traded company executiveswho have fairly good insight into the company and thus can estimate the risk levels andrisk premium for the company in a reasonable manner. As a conclusion, it can beassumed that the AHP model is not an appropriate analytical tool to be used by banksand fund managers that have basically diversified investments

  • 46716.
    Yalcin, Ihsan
    Karlstad University, Faculty of Social and Life Sciences.
    Vem är turisten?: En studie av föreställningar om turism och målgrupper för turism i Värmland2007Independent thesis Advanced level (degree of Magister), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Denna studie undersöker frågan om vem som anses vara turisten, d v s, vem turist subjektet är, hur denna föreställs i turismstudier och turismnäringen, samt varför. Intresse för denna fråga väcktes av personliga erfarenheter. Det har att göra med hur jag inte fick samma uppmärksamhet som andra svenska turister både när jag turistade i mitt eget land (Turkiet) och även när jag turistade i Sverige handlar om varför jag inte ansågs vara turist och behandlades annorlunda. Varför och vad är de bakomliggande aspekter som urskiljer mig från svenskar (västerlänningar) som turist subjekt? Det är detta som föranledde huvudfrågan för denna uppsats: vem är eller anses vara en turist?

    Ytterligare en anledning till varför jag valde att undersöka frågan är att jag ville veta huruvida “invandrare” i Värmland uppfattas som turist subjekt eller inte. Råder samma föreställning om turist subjektet även i Värmland? I anknytning till denna fundering ställde jag också frågor till ”invandrare” i Värmland om de ser sig själva som turister eller inte och vilka faktorer som påverkar det. Vidare ville jag också undersöka huruvida föreställningen om turist subjektet färgar vilka som anses vara målgrupper inom turismnäringen i Värmland, samt hur kommer detta till uttryck i bland annat broschyrer, planeringsdokument och destinationsutveckling av turistorter. Arbetets tonvikt kommer att läggas på vem eller vilka anses vara turister och vem eller vilka som turistar i Värmland.

  • 46717.
    Yamamura, Shinya
    et al.
    Kyushu Research Center, National Institute of Information and Communications Technology.
    Nagata, Akira
    Kyushu Research Center, National Institute of Information and Communications Technology.
    Uchida, Masato
    Network Design Research Center, Kyushu Institute of Technology.
    Tsuru, Masato
    Network Design Research Center, Kyushu Institute of Technology.
    Virtual Segment: Segmentation Method for Store-carry-forward Routing Schemes2008In: Proceedings of The 1st Workshop on Wireless Broadband Access for Communities and Rural Developing Regions (WIRELESS4D'08, co-locaded with M4D 2008), Karlstad: Karlstad University , 2008, p. 102-111Conference paper (Refereed)
  • 46718.
    Yang Halvardsson, Chenfei
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Artistic Studies (from 2013).
    Hur minns du allt?: -En självobservationsstudie om memorering inom klassiskt piano2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Playing a piece by heart is an important aspect of being a musician, despite this there are few concrete guidelines for how the memorization process is optimized, and musicians often find their own way. The purpose of this study was therefore to, from a design theory perspective, investigate which resources underlie effective memorization. To investigate this, two memorization methods, constructed in line with previous literature and research, were tested on two Intermezzo by Brahms. Method one was based on mechanical learning without analysis, method two was based on harmonics analysis. Video observation and logbook were used to document the process, efficiency was measured by utilized hours. Results showed that method two depended more on conceptual framework compared to method one, the methods were however similar in other used resources. Method two (5 hours 15 minutes) was more time-efficient than method one (14 hours 20 minutes). In addition to the improved efficiency, method two contributed to greater awareness in the memorization process, which in turn led to increased motivation for memorization. The discussion examines the study's results in relation to previous literature and research. 

  • 46719. Yang, Li
    Spectral model of halftone on a fluorescent substrate2005In: J.Imaging Science Technology 49 (2005), 179-184Article in journal (Refereed)
  • 46720. Yang, Li
    What has been overlooked in Kubelka-Munk Theory?2005Conference paper (Other (popular science, discussion, etc.))
  • 46721. Yang, Li
    et al.
    Fogden, A.
    Pauler, N.
    Sävborg, Ö.
    Kruse, B.
    A novel method for studying ink penetration of a print2005In: Nordic Pulp and Paper Research Journal 40(2005),423-429Article in journal (Refereed)
  • 46722. Yang, Li
    et al.
    Fogden, A.
    Pauler, N.
    Sävborg, Ö.
    Kruse, B.
    Studying ink penetration by microscopic and spectroscopic techniques2006In: J.Imaging Science and TechnologyArticle in journal (Refereed)
  • 46723. Yang, Li
    et al.
    Kruse, B.
    Studying ink penetration by microscopic and spectroscopic techniques2005Conference paper (Other (popular science, discussion, etc.))
  • 46724. Yang, Li
    et al.
    Miklavcic, S.J.
    Revised Kubelka-Munk theory.III: A general theory of light propagation in scattering and absorptive media2005In: J.Optical Society of America A 22(9), 1866-1873, (2005)Article in journal (Refereed)
  • 46725. Yang, Li
    et al.
    Miklavcic, S.J.
    Theory of light propagation incorporation scattering and absorption in turbid media2005In: Optics Letter 30(7), 792-794, 2005Article in journal (Refereed)
  • 46726.
    Yang, Ting
    et al.
    China, Australia.
    Sun, Yugeng
    China.
    Taheri, Javid
    The University of Sydney, Australia.
    Zomaya, Albert
    The University of Sydney, Sydney, Australia.
    DLS: A Dynamic Local Stitching Mechanism to Rectify Transmitting Path Fragments in Wireless Sensor Networks2013In: Journal of Network and Computer Applications, ISSN 1084-8045, E-ISSN 1095-8592, Vol. 16, no 1, p. 306-315Article in journal (Refereed)
    Abstract [en]

    In this paper, a pair of novel rectification algorithms (greedy negative pressure push algorithm and dynamic local stitching algorithm) is proposed to cooperatively repair broken transmitting paths in Wireless Sensor Networks. Our approach is to overcome the poor data validity in WSNs, specifically for harsh application environments - such as unattended sensor nodes or frail wireless transmitting channels - where fault tolerant becomes a vital aspect. Using adjacency information, Greedy negative pressure push algorithm can efficiently grow the transmitting path to achieve the minimum energy consumption for relays model. Here, we measured packet travel time and the expectation of relay distance to set this model's key parameters to achieve the lowest possible end-to-end transmitting delay. Dynamic local stitching algorithm has a major difference with other existing routing algorithms in rectifying broken paths: despite others that reroute whole paths, our algorithms only stitch broken fragments of the original path spending minimum amount of energy as well as recovery time. Based on mathematical computing and simulation, our novel rectification algorithm could effectively (1) reduce the total number of routing overheads, (2) improve net throughput, and (3) increase system fault tolerant much better than four already designed routing algorithms. Results were also very promising to motivate other algorithms in this field.

  • 46727.
    Yang, Ting
    et al.
    School of Electrical and Automation Engineering, Tianjin University, Tianjin.
    Woo, Peng-Yung
    Department of Electrical Engineering, College of Engineering and Engineering Technology, Northern Illinois University.
    Wang, Zhaoxia
    Institute of High Performance Computing, Singapore.
    Taheri, Javid
    The University of Sydney, Australia.
    Choor, Chin Hoong
    Department of Civil and Environmental Engineering, National University of Singapore, Singapore.
    Hu, Guoqiang
    School of Electrical & Electronic Engineering, Nanyang Technology University, Singapore.
    Ubiquitous Data-Centric Sensor Networks2014In: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477, Vol. 10, no 4Article in journal (Refereed)
  • 46728. Yang, Wei
    Material selection and failure analysis of a ribbon element in a line source loudspeaker2004Independent thesis Advanced level (degree of Master (One Year))Student thesis
  • 46729.
    Yang, Z.
    et al.
    School of Engineering, Blekinge Institute of Technology, Ronneby.
    Mohammed, A.
    School of Engineering, Blekinge Institute of Technology, Ronneby.
    Wireless Broadband Communication Access and Applications from High Altitude Platforms2008In: Proceedings of The 1st Workshop on Broadband Access for Communities and Rural Developing Regions (WIRELESS'08, co-located with M4D 2008), Karlstad: Karlstad University , 2008, p. 211-217Conference paper (Refereed)
  • 46730.
    Yang, Zhe
    et al.
    Blekinge Institute of Technology, Ronneby.
    Khamit, Saltanat
    Royal Institute of Technology, Stockholm.
    Mohammed, Abbas
    Blekinge Institute of Technology, Ronneby.
    Larson, P.
    Strategic Dev. Affärsverken Karlskrona AB.
    An Investigation of the Business Model in the Karlskrona Municipal Wireless Network in Sweden2008In: Proceedings of The 1st Workshop on Wireless Broadband Access for Communities and Rural Developing Regions (WIRELESS4D'08, co-located with M4D 2008), Karlstad: Karlstad University , 2008, p. 30-38Conference paper (Refereed)
  • 46731.
    Yang, Zhenkun
    Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Enineering.
    Alternatives to hard chromium plating on piston rods2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
  • 46732.
    Yasaman, Amel
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Educational Studies.
    Källsortering och återanvändning i förskolan: - En jämförande studie om pedagogers kunskap och arbetssätt i traditionella och miljöinriktade förskolor2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 46733.
    Yasir, Irshad
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics, Science, Mathematics and Engineering Education Research.
    A study of a stochastic differential equation based model for wireless channels2008Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    An autoregressive (AR) first order model is often used for modelling wireless channels. This is done in spite of the fact that a satisfactory physical explanation for this model has been missing. However, in the recent paper [Feng, Field and Haykin. 2007] derive a model in form of a first order stochastic differential equation (SDE) from a stochastic description of the scattered electric field. After discretizing this SDE, a physically motivated first order AR model is obtained.

  • 46734. Yasseri Blomqvist, Shahram
    Trygga gymnasieelever? - elevuppfattningar av en skolas sociala klimat och miljö2004Independent thesis Basic level (professional degree)Student thesis
    Abstract [sv]

    Denna uppsats redovisar resultatet av en enkätundersökning som genomfördes på en svensk gymnasieskola under höstterminen 2003. Undersökningen hade som syfte att försöka kartlägga hur gymnasieeleverna på den aktuella skolan upplevde sin studiesociala situation. Fokus har i arbetet lagts på begreppet trygghet vilket jag menar är grundläggande för en sund studiesocial miljö. Jag har i min definition av begreppet trygghet och i undersökningen ringat in tre områden som jag anser har avgörande betydelse för hur den sociala atmosfären på en skola ter sig: 1. Den fysiska miljön 2. Den elevsociala situationen 3. Skolpersonalens sätt att finnas tillhands vid konflikter och problem Jag hävdar att dessa tre områden tillsammans i stort formar hur elever på en skola upplever sin studiesociala situation. Min enkät är därav utformad på så sätt att den täcker in dessa tre områden. Resultatet av min undersökning har i viss mån varit svårbedömt då en del av mina enkätfrågor varit möjliga att tolka på olika sätt. Trots detta så tycker jag mig ändå se vissa mönster i mitt resultat. Överlag så är eleverna ganska nöjda med den fysiska miljön. Dock med några undantag som i stort troligen beror på att skolan i sig är något underdimensionerad i förhållande till antal elever. Den elevsociala situationen verkar vara den som eleverna är mest nöjda med, även om det utifrån svarssammanställningar och kommentarer verkar som om mobbing är något som eleverna haft svårt att definiera och ta ställning till om det förekommer på skolan. Då det gäller skolpersonalens sätt att finnas tillhands vid konflikter och problem så är det helt klart det område som eleverna har uttryckt starkast känslor inför, något som liksom svårigheten att definiera mobbing känns igen från tidigare forskning . Eleverna uttrycker åsikter som att lärare och annan personal inte ser, eller väljer att inte se konflikter, vilket jag hävdar kan bero på att lärare i gymnasieskolan sällan möter eleverna utanför klassrummet. Jag menar att gymnasielärare sällan är fysiskt närvarande i de miljöer som eleverna nyttjar för elevsocial kontakt så som elevfik, uppehållsrum etc. och att detta kan vara en del av förklaringen till den negativa elevupplevelsen av detta problemområde.

  • 46735.
    Ydemar, Malin
    et al.
    Karlstad University.
    Zachrisson, Marie
    Karlstad University.
    Sociala faktorer och föräldrars attityder till karies bland yngre barn: En litteraturstudie2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Introduktion: Av alla barn i världen drabbas 60-90 procent av karies, som är den vanligaste sjukdomen under barndomen mellan åldern två till elva år. Munhygien- och kostvanor är båda faktorer som är kopplade till beteenden och vanor som styrs av sociala faktorer, kunskaper och attityder. Vanor som etableras tidigt ligger till grund för munhälsan senare i livet. Föräldrarna utgör en viktig modell för sina barn gällande munhälsan och munhygienvanor förs över från föräldrar till barn.

    Syfte: Syftet var att beskriva föräldrars attityder till kariesassocierade faktorer bland yngre barn och eventuella samband mellan sociala faktorer och karies.

    Metod: Litteraturstudien baserades på vetenskapliga artiklar från PubMed.

    Resultat: Stor variation fanns bland föräldrarnas attityder, kunskaper och vanor till kariesassocierande faktorer bland yngre barn. Föräldrars attityder var sammankopplat med kariesassocierande faktorer bland yngre barn. Sociala faktorer som låg klasstillhörighet, inkomst- och utbildningsnivå hos föräldrarna ökade kariesprevalensen bland barnen.

    Konklusion: Barns munhälsovanor var kopplade till föräldrarnas attityder. Attityderna präglades av varifrån föräldrarnas kunskap kom och hur starkt rotad den traditionella synen var. Yngre barns kariessituation var starkt förknippad med sociala faktorer som påverkade familjen. Det fanns en tendens att högre klasstillhörighet, inkomst- och utbildningsnivå hos föräldrarna minskade kariesprevalensen bland barnen.

  • 46736.
    Ydesen, Christian
    et al.
    Aalborg university, Denmark.
    Ludvigsen, Kari
    Unievrsitet i Bergen.
    Lundahl, Christian
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Educational Studies.
    Creating an Educational Testing Profession in Norway, Sweden, and Denmark, 1910-1960.2013In: European Educational Research Journal (online), ISSN 1474-9041, E-ISSN 1474-9041, Vol. 12, no 1, p. 120-138Article in journal (Refereed)
    Abstract [en]

    In Norway, Sweden and Denmark national testing communities advocating the introduction and expanded use of standardised educational tests in the national educational systems emerged around World War I. Using international research and cross-border networking activities, these coteries were able to gain power and thus establish and promote a new profession, the educational psychologist, along with instituting practices of alleged scientific tests in the following decades.

    This article presents a historical analysis of the central processes and developments constituting the Norwegian, Swedish, and Danish testing communities. The aim is to understand the workings of these professionalization movements rooted in the creation of an international fellowship of like-mindedness and a knowledge monopoly connected with standardised educational tests. Viewed from a contemporary perspective, this type of analysis is relevant, because specialised knowledge and experts with knowledge monopolies remain prevalent in the modern-day field of education policy and practice. Thus, the roots of this inherent tendency towards expert knowledge in modern welfare state educational settings can be more adequately grasped through a better understanding of the historical precursors.

    The article discusses the importance and actual impact of the Norwegian, Swedish, and Danish testing communities on national educational practices, the significance of the international interplay, and how and to what extent national political and educational climates were shaped by new experts and knowledge.

    It is argued that the testing communities were able to gain authority in the national educational fields through the creation and maintenance of organisations, knowledge, and practices, as well as in the forming of alliances with politicians, universities, and teachers’ unions in a joint endeavour that promoted educational psychology and testing in the three Scandinavian educational fields.

  • 46737. Ydén, Jenny
    et al.
    Forsberg, Ann-Catrin
    Polishandräckning - en studie om ett eventuellt behov av en lagändring i LUV 43 §2005Independent thesis Basic level (degree of Bachelor)Student thesis
  • 46738.
    Ye, Panming
    et al.
    Karlstad University. Karlstad University, Faculty of Economic Sciences, Communication and IT.
    Zhou, Yong
    Karlstad University. Karlstad University, Faculty of Economic Sciences, Communication and IT.
    Distributed Cross-layer Monitoring in Wireless Mesh Networks2009Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Wireless mesh networks has rapid development over the last few years. However, due to properties such as distributed infrastructure and interference, which strongly affect the performance of wireless mesh networks, developing technology has to face the challenge of architecture and protocol design issues. Traditional layered protocols do not function efficiently in multi-hop wireless environments. To get deeper understanding on interaction of the layered protocols and optimize the performance of wireless mesh network, more recent researches are focusing on cross-layer measurement schemes and cross-layer protocol design. The goal of this project is to implement a distributed monitoring mechanism for IEEE802.11 based wireless mesh networks. This module is event-based and has modular structure that makes it flexible to be extended. This project results a novel Cross-Layer Monitoring Module, CLMM, which is a prototype that monitors each layer of the nodes locally and dynamically, calculates the average values of the metrics, compares these values with thresholds and handles the cross-layer messages of each node. The CLMM also has a routing module structure that can be extended to distribute the metrics to its neighbors.

  • 46739.
    Yedugundla, Kiran
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Evaluating and Reducing Multipath Transport Latency2019Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Access to the Internet is a very significant part of everyday life with increasing online services such as news delivery, banking, gaming, audio and high quality movies. Applications require different transport guarantees with some requiring higher bandwidth and others low latency. Upgrading access link capacity does not guarantee faster access to the Internet as it offers higher bandwidth but may not offer low latency. With increasing number of mobile devices supporting more than one access technologies (e.g., WLAN, 3G, 4G,..), there is a need to analyse the impact of using multiple such technologies at the same time. Legacy transport protocols such as TCP or SCTP are only able to connect to one access network at a time to create an end-to-end connection. When more than one access technology is used, there may be a large difference in the data rate offered by each technology. This asymmetry might impact latency sensitive applications by creating out of order delivery. In this thesis, we focus on the latency aspect of multipath transport protocol performance. We consider CMT-SCTP and Multipath TCP as available multipath protocols that were designed for exploiting multiple paths for better throughput and reliability. We consider various real world traffic scenarios such as Video, Gaming and Web traffic to measure end-to-end latency. We perform simulations, emulations and experiments using heterogeneous network settings involving access networks with different bandwidth, delay and loss characteristics. MPTCP performs better in terms of latency than CMT-SCTP and TCP in certain scenarios where available paths are symmetric. However, MPTCP does not perform well in asymmetric scenarios with latency sensitive traffic. This analysis provides insights in to various areas of improvement in MPTCP such as scheduling and loss recovery to achieve low latency. We further focus on packet loss recovery in MPTCP for specific cases of tail losses to reduce latency. Tail losses are the losses that occur at the end of a packet stream. Recovering such losses is of higher significance to latency sensitive applications. We propose a modification to the use of TLP, a mechanism in TCP for tail loss recovery. We evaluate the performance of proposed TLP modification, first using emulations and with real world network experiments. Our results show significant improvements in latency for specific loss scenarios in emulations and up to 50% improvement in experiments.

  • 46740.
    Yedugundla, Kiran
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Hurtig, Per
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Handling Packet Losses in Cloud-Based Application Traffic2019In: Proceedings of the 9th International Conference on Cloud Computing and Services Science - Volume 1: CLOSER, SciTePress, 2019, p. 111-119Conference paper (Refereed)
    Abstract [en]

    Internet traffic is comprised of data flows from various applications with unique traffic characteristics. For many cloud applications, end-to-end latency is a primary factor affecting the perceived user experience. As packet losses cause delays in the communication they impact user experience, making efficient handling of packet losses an important function of transport layer protocols. Multipath TCP (MPTCP) is a modification to TCP that enables simultaneous use of several paths for a TCP flow. MPTCP is known to improve throughput. However, the performance of MPTCP is not optimal when handling certain loss scenarios. Efficient packet loss recovery is thus important to achieve desirable flow completion times for interactive cloud-based applications. In this paper we evaluate the performance of MPTCP in handling tail losses using traffic traces from various cloud-based applications. Tail losses, losses that occur at the end of a flow or traffic burst, are particularly challenging from a latency perspective as they are difficult to detect and recover in a timely manner. Tail losses in TCP are handled by using a tail loss probe (TLP) mechanism which was adapted to MPTCP from TCP. We investigate the performance of TLP in MPTCP, comparing the standard implementation to a recently proposed, less conservative approach. Our experimental results show that a less conservative implementation of TLP performs significantly better than the standard implementation in handling tail losses, reducing the average burst completion time of cloud based applications when tail loss occurs by up to 50% in certain cases.

  • 46741.
    Yedugundla, Kiran
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Hurtig, Per
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Multipath TCP: Can it Reduce Transport Latency for Web Traffic?2015Conference paper (Refereed)
  • 46742.
    Yedugundla, Kiran
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Hurtig, Per
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Probe or Wait: Handling tail losses using Multipath TCP2017In: 2017 IFIP Networking Conference (IFIP Networking) and Workshops, IEEE, 2017Conference paper (Refereed)
    Abstract [en]

    Packet losses are known to affect the performance of latency sensitive Internet applications such as media streaming and gaming. Transport protocols recover from packet loss in order to provide reliable end-to-end communication and improve user experience. The efficiency of loss recovery mechanisms influences the completion time of flows, and thus also the application performance as perceived by the end user. In this paper we focus on state-of-the-art loss recovery mechanisms for TCP and Multipath TCP. We use controlled tail loss scenarios to evaluate the performance of loss recovery mechanisms and, based on the observations, we propose an enhanced tail loss recovery mechanism for Multipath TCP, to improve the loss recovery time. Our experiment results, using the Linux Multipath TCP implementation, show consistent end-to-end latency performance improvement in considered scenarios.

  • 46743.
    Yedugundla, Venkata Kiran
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Ferlin, Simone
    Simula Research Laboratory, Oslo, Norway.
    Dreibholz, Thomas
    Simula Research Laboratory, Oslo, Norway.
    Alay, Özgü
    Simula Research Laboratory, Oslo, Norway.
    Kuhn, Nicolas
    IMT Télécom Bretagne, IRISA, Cesson-Sévigné, France.
    Hurtig, Per
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Brunstrom, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Is Multi-Path Transport Suitable for Latency Sensitive Traffic?2016In: Computer Networks, ISSN 1389-1286, E-ISSN 1872-7069, Vol. 105, p. 1-21Article in journal (Refereed)
    Abstract [en]

    This paper assesses whether multi-path communication can help latency-sensitive applications to satisfy the requirements of their users. We consider Concurrent Multi-path Transfer for SCTP (CMT-SCTP) and Multi-path TCP (MPTCP) and evaluate their proficiency in transporting video, gaming, and web traffic over combinations of WLAN and 3G interfaces. To ensure the validity of our evaluation, several experimental approaches were used including simulation, emulation and live experiments. When paths are symmetric in terms of capacity, delay and loss rate, we find that the experienced latency is significantly reduced, compared to using a single path. Using multiple asymmetric paths does not affect latency - applications do not experience any increase or decrease, but might benefit from other advantages of multi-path communication. In the light of our conclusions, multi-path transport is suitable for latency-sensitive traffic and mature enough to be widely deployed. 

  • 46744.
    Yenge Massa, Noela
    et al.
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School (from 2013).
    Karlsson, Per
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School (from 2013).
    The factors influencing students’ career choices towards the accounting profession in Sweden2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Purpose – This thesis aimed at investigating students’ beliefs influencing their personal attitudes and subjective norms not to choose the accounting profession by using the simplified Theory of Reasoned Action (TRA) model.

    Theoretical framework – This study used the simplified TRA model to investigate the beliefs that influence students not to choose the accounting profession. From an accounting context, prior research has indicated that, there are intrinsic and extrinsic factors that determine the behavioural beliefs of students about the accounting profession. Likewise, normative beliefs are another construct of the simplified TRA model that influences students’ intentions towards the accounting profession.

    Methodology – Through a quantitative approach, questionnaires were sent electronically to first and second year students at five major universities in Sweden. In total, 323 students replied to the questionnaire. Since this study focused on students intending to choose business administration, non-business administration students were deleted from the sample giving an actual sample size of 228. The data collected was analyzed in two steps using multiple regression analysis.

    Findings – The findings of the study confirmed the simplified TRA model. The results showed that both behavioural and normative beliefs influenced students’ intentions not to choose the accounting profession. For behavioral beliefs, no personal interest in accounting, the belief that accounting is boring and the belief that other occupations (for instance, marketing and management) negatively influenced students’ attitudes not to choose the accounting profession. Similarly, for normative beliefs, teachers and peers influenced students’ subjective norms not to choose the accounting profession.

    Practical implications – The practical implications of this study are two-folded. Firstly, program directors at universities should engage in hiring qualified teachers in accounting, organize supportive activities to encourage students about the accounting profession. Also, program directors should include compulsory internships in the curriculum so that students can learn about the accounting profession. Secondly, former accounting students should get involved in the process of encouraging students about the accounting profession.

    Originality/value – This paper contributes to the existing literature by highlighting the beliefs influencing the personal attitudes and subjective norms of students not to choose the accounting profession. Therefore, the thesis provides an up-to-date theory about the TRA in the accounting profession in Sweden.

  • 46745. Yeom, H. W.
    et al.
    Horikoshi, K.
    Zhang, Hanmin
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Ono, K.
    Uhrberg, R. I. G.
    Nature of the broken-symmetry phase of the one-dimensional metallic In/Si(111) surface2002In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 65, no 24Article in journal (Refereed)
  • 46746.
    Yermentayeva, Aierke
    et al.
    Karlstad University.
    Carey, Luke
    Service-Dominant Orientation 2.0: Consideration of Sustainability Concerns2017Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Service-Dominant (S-D) logic suggests mutual strategic benefit for all actors of the value network (Vargo & Lusch 2016). However, theoretical reasoning lacks empirical validation of S-D logic implications for performance indicators as well as customer experience. First step in operationalization of S-D logic was undertaken by Karpen et al. (2012; 2015). The model nevertheless grasps dyadic relationship of company and customer, while S-D logic theory requires zooming out interactions to the level of multiple actors. Thus, to ensure multi-actor resource integration external environment has to be added. Additionally, sustainability concerns nowadays gain growing attention, which urges companies to reckon with environmental and societal issues to achieve strategic benefit.  

    The present paper aims at empirical testing of an extended framework of S-D orientation 2.0. Incorporation of Sustainability Interaction capability into the operational model proposed by Karpen et al. (2011) is expected to strengthen association between S-D orientation and customer-related indicators.

    The study is designed as quantitative explanatory research based on survey via questionnaire in the context of Ikea furniture retailing. Hypotheses to examine relationship between variables S-D orientation 2.0 and customer-related indicators are based on the S-D logic theory and research of Karpen et al. (2015).

    Hypotheses testing empirically supports the previous research regarding importance of S-D orientation in predicting customer-related indicators. Besides, S-D orientation 2.0 has superior fit over the previous model, which is explained by additional factor. Sustainability interaction as an additional value co-creation capability significantly influences market performance indicators, since corporate activities towards society and environment influences customer connection and loyalty to the company.

    The research has both theoretical and practical implications. From theoretical perspective the research further develops middle-range theory for abstract S-D logic framework by translating its premises into service-driving skills of company to co-create value in conjunction with customers. The contribution of the study is in inclusion of external environment, which ensures complexity of interactions between multiple actors, through sustainability interaction capability. Service-driving skills in form of corporate capabilities provide managers with practical guideline to improve customer experience and perception. Strategical implementation of interaction capabilities has a positive influence on customer-related indicators, while sustainability interaction capability enhances trust, affective commitment and repurchase intention. Thus, implementation of S-D orientation capabilities with reckoning sustainability issues provides companies with competitive advantage.

  • 46747.
    Ygfeldt, Sofia
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Department of Language, Literature and Intercultural Studies (from 2013).
    Skildring av mångkulturalitet i tre utvalda barnböcker.: En studie om framställningen av karaktärer med utländsk bakgrund och användningen av mångkulturell litteratur i skolan.2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As the Swedish society becomes increasingly multicultural so does the educational system and schools. I believe with high probability that as a teacher I will teach a multicultural group in the classroom, therefore I want to become aware of what message the multicultural children ́s and youth literature portrays. The goal of the study is to enguire how people from countries other than Sweden are portrayed in three children ́s and youth books. I will be utilizing a qualitative litearture analysis that surrounds thus giving insight into how this is portrayed in the chosen literature pieces. The results of the study concludes that multiculturalism is depicted in everyday contexts and the characters are described in a way that agrees with their stereotypic looks.

  • 46748. Yi, Choong-ho
    A Framework for Representing and Reasoning with Information Systems1999Conference paper (Refereed)
  • 46749. Yi, Choong-ho
    Informal and formal methods for systems development - focusing on UML2001In: On Methods for Systems Development in Professional Organisations. The Karlstad University Approach to Information Systems and its Role in Society (Nilsson, AG & Pettersson, JS, Eds.), 307-, Lund: Studentlitteratur , 2001, p. 307-324Chapter in book (Refereed)
    Abstract [en]

    Systems development, in a strict sense, is a formalisation of the end-user' desires in the form of executable computer programs. In the last two decades a number of formal methods have been suggested to systemise this formalising process and make it more efficient, eventually to achieve an optimal automation of the process. This chapter addresses the following issues: Which are these formal methods, and what are their advantages and disadvantages, compared with traditional, informal methods? Do formal methods work only in theory, but not in practice? A study is presented as an illustration, showing how UML for object-oriented systems development can be formalised using a formal technique called FUML

  • 46750. Yi, Choong-ho
    Informella och formella metoder för systemutveckling- med fokus på UML2000In: A. G. Nilsson and J. Petterson (Eds.), Karlstadskolans synpå informatikens roll i samhället, pages 301-318, Lund: Studentlitteratur , 2000, p. 301-318Chapter in book (Refereed)
    Abstract [sv]

    Systemutveckling är i strikt mening en formalisering av användarnas önskemål i form av exekverbara datorprogram. För att effektivisera, systematisera och till slut automatisera denna formaliseringsprocess maximalt har en mängd formella metoder föreslagits under de två senaste decennierna. I kapitlet diskuteras följande frågor: Vilka är dessa formella metoder och vilka för- och nackdelar har de jämfört med traditionella, informella metoder? Fungerar formella metoder bara i teorin men inte i praktiken? Som illustration presenteras en studie om hur UML för objekt-orienterad systemutveckling kan formaliseras med hjälp av en formell teknik kallad FUML

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