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  • 301.
    Villanueva, Walter
    et al.
    KTH.
    Grönhagen, Klara
    KTH.
    Amberg, Gustav
    KTH.
    Ågren, John
    KTH.
    Multicomponent and multiphase simulation of liquid-phase sintering2009In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 47, no 2, p. 512-520Article in journal (Refereed)
    Abstract [en]

    Numerical simulation of liquid-phase sintering using a multicomponent and multiphase model is presented. The model consists of convective concentration and phase-field equations coupled with the Navier-Stokes equations with surface tension forces. The governing equations are nondimensionalized and an adaptive finite element method is utilized. An idealized phase diagram, surface energies, and typical dimensionless parameters are some input into the model. Important dynamics in liquid-phase sintering such as rapid wetting and motion of particles due to capillary forces are studied. Some factors that are known to significantly affect the dynamics of the sintering process such as contact angles and volume ratios are also investigated. In addition, numerical results on the motion of particles due to capillary forces were compared with an existing analytical model. Good agreement between numerical and analytical results is obtained within the validity of the analytical model.

  • 302.
    Villanueva, Walter
    et al.
    KTH.
    Sjödahl, Johan
    KTH.
    Stjernström, Mårten
    KTH.
    Roeraade, Johan
    KTH.
    Amberg, Gustav
    KTH.
    Microdroplet deposition under a liquid medium2007In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 3, p. 1171-1177Article in journal (Refereed)
    Abstract [en]

    An experimental and numerical study of the factors affecting the reproducibility of microdroplet depositions performed under a liquid medium is presented. In the deposition procedure, sample solution is dispensed from the end of a capillary by the aid of a pressure pulse onto a substrate with pillar-shaped sample anchors. The deposition was modeled using the convective Cahn-Hilliard equation coupled with the Navier-Stokes equations with added surface tension and gravity forces. To avoid a severe time-step restriction imposed by the fourth-order Cahn-Hilliard equation, a semi-implicit scheme was developed. An axisymmetric model was used, and an adaptive finite element method was implemented. In both the experimental and numerical study it was shown that the deposited volume mainly depends on the capillary-substrate distance and the anchor surface wettability. A critical equilibrium contact angle has been identified below which reproducible depositions are facilitated.

  • 303.
    von Matérn, Gunnur
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Differences in Children’s Experiences when Playing with a Social Robo: a Field Experiment2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study explored human-robot interaction where children got to play with the interactive social robot Romo. The focus of the study was to explore if children experienced the interactions with the robot differently depending on two parameters. The parameters used were thought to measure differences in experiences, attitudes and expectations towards the robot depending on whether the children were co-creators of the robot or merely had playful interaction with the robot. The results indicated that the children in both activity parameter groups had similar pleasurable experiences apart from four additional categories that were detected in the co-creation group. Something that indicates that the group of children that were given the opportunity to manipulate and form Romo’s behavior had a richer user experience compared to the group of children that only played with Romo. It was also noticeable that none of the children that manipulated and formed Romo’s behavior experienced it as direct learning. They saw the learning process more as being a playful experience and many of them expressed that they had taught Romo to do various things. The ability to edit Romo’s robotic motions and behavior, through an easy contextual-sign interface, inevitably allowed the children to understand physical and computational models through play.

  • 304.
    Wallenstein, Sven-Olov
    Södertörn University, School of Culture and Communication, Philosophy.
    Hegel and the Grounding of Architecture2009In: Paradoxes of appearing: essays on art, architecture and philosophy / [ed] Michael Asgaard Andersen, Henrik Oxvig, Baden: Lars Müller Publ. , 2009, p. 57-77Conference paper (Other academic)
  • 305.
    Wallenstein, Sven-Olov
    Södertörn University, School of Culture and Communication, Philosophy.
    The Structure of Desire: The Ideological Motives of Swedish Modernism and the Road to the "People's Home"2009In: Nortopia: modern nordic architecture and postwar Germany / [ed] Caroline Spliid Høgsbro, Antje Wischmann, Berlin: Jovis , 2009, p. 62-79Chapter in book (Other academic)
  • 306. Walters, Michael L.
    et al.
    Lohse, Manja
    Hanheide, Marc
    Wrede, Britta
    Syrdal, Dag Sverre
    Koay, Kheng Lee
    Green, Anders
    Hüttenrauch, Helge
    Södertörn University, School of Communication, Media and it, Informatics.
    Dautenhahn, Kerstin
    Sagerer, Gerhard
    Severinson-Eklundh, Kerstin
    Evaluating the Robot Personality and Verbal Behavior of Domestic Robots Using Video-Based Studies2011In: Advanced Robotics, ISSN 0169-1864, E-ISSN 1568-5535, Vol. 25, no 18, p. 2233-2254Article in journal (Refereed)
    Abstract [en]

    Robots are increasingly being used in domestic environments and should be able to interact with inexperienced users. Human-human interaction and human-computer interaction research findings are relevant, but often limited because robots are different from both humans and computers. Therefore, new human-robot interaction (HRI) research methods can inform the design of robots suitable for inexperienced users. A video-based HRI (VHRI) methodology was here used to carry out a multi-national HRI user study for the prototype domestic robot BIRON (BIelefeld RObot companioN). Previously, the VHRI methodology was used in constrained HRI situations, while in this study HRIs involved a series of events as part of a 'home-tour' scenario. Thus, the present work is the first study of this methodology in extended HRI contexts with a multi-national approach. Participants watched videos of the robot interacting with a human actor and rated two robot behaviors (Extrovert and Introvert). Participants' perceptions and ratings of the robot's behaviors differed with regard to both verbal interactions and person following by the robot. The study also confirms that the VHRI methodology provides a valuable means to obtain early user feedback, even before fully working prototypes are available. This can usefully guide the future design work on robots, and associated verbal and non-verbal behaviors.

  • 307. Wang, Jiayu
    et al.
    Do-Quang, Minh
    KTH.
    Cannon, James J.
    University of Tokyo, Tokyo, Japan.
    Yue, Feng
    University of Tokyo, Tokyo, Japan.
    Suzuki, Yuji
    University of Tokyo, Tokyo, Japan.
    Amberg, Gustav
    KTH.
    Shiomi, Junichiro
    KTH.
    Surface structure determines dynamic wetting2015In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, article id 8474Article in journal (Refereed)
    Abstract [en]

    Liquid wetting of a surface is omnipresent in nature and the advance of micro-fabrication and assembly techniques in recent years offers increasing ability to control this phenomenon. Here, we identify how surface roughness influences the initial dynamic spreading of a partially wetting droplet by studying the spreading on a solid substrate patterned with microstructures just a few micrometers in size. We reveal that the roughness influence can be quantified in terms of a line friction coefficient for the energy dissipation rate at the contact line, and that this can be described in a simple formula in terms of the geometrical parameters of the roughness and the line-friction coefficient of the planar surface. We further identify a criterion to predict if the spreading will be controlled by this surface roughness or by liquid inertia. Our results point to the possibility of selectively controlling the wetting behavior by engineering the surface structure.

  • 308.
    Wang, Yuli
    et al.
    KTH / University of Oslo, Oslo, Norway.
    Amberg, Gustav
    Södertörn University. KTH.
    Carlson, Andreas
    University of Oslo, Oslo, Norway.
    Local dissipation limits the dynamics of impacting droplets on smooth and rough substrates2017In: Physical Review Fluids, ISSN 2469-990X, Vol. 2, no 3, article id 033602Article in journal (Refereed)
    Abstract [en]

    A droplet that impacts onto a solid substrate deforms in a complex dynamics. To extract the principal mechanisms that dominate this dynamics, we deploy numerical simulations based on the phase field method. Direct comparison with experiments suggests that a dissipation local to the contact line limits the droplet spreading dynamics and its scaled maximum spreading radius beta(max). By assuming linear response through a drag force at the contact line, our simulations rationalize experimental observations for droplet impact on both smooth and rough substrates, measured through a single contact line friction parameter mu(f). Moreover, our analysis shows that dissipation at the contact line can limit the dynamics and we describe beta(max) by the scaling law beta(max) similar to (Re mu(l)/mu(f))(1/2) that is a function of the droplet viscosity (mu(l)) and its Reynolds number (Re).

  • 309.
    Wang, Yuli
    et al.
    KTH / Jiangsu University, Zhenjiang, Peoples R China.
    Do-Quang, Minh
    KTH.
    Amberg, Gustav
    KTH.
    Impact of viscoelastic droplets2017In: Journal of Non-Newtonian Fluid Mechanics, ISSN 0377-0257, E-ISSN 1873-2631, Vol. 243, p. 38-46Article in journal (Refereed)
    Abstract [en]

    We conduct numerical experiments on viscoelastic droplets hitting a flat solid surface. The results present time-resolved non-Newtonian stresses acting in the droplet. Comparing with the simulation of the impact of a Newtonian droplet, the effects of viscoelasticity on droplet behaviors such as splashing, the maximum spreading diameter and deformation are analyzed. With detailed information on the contact line region, we demonstrate how the contact line behaves according to the transition of the fluid property from elasticity dominated to shear-thinning dominated when a droplet expands and contracts on the substrate. The propose of this work is to discuss whether and how the elasticity in an impinging droplet takes effect.

  • 310.
    Wang, Yuli
    et al.
    KTH.
    Do-Quang, Minh
    KTH.
    Amberg, Gustav
    KTH.
    Viscoelastic droplet dynamics in a y-shaped capillary channel2016In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 3, article id 033103Article in journal (Refereed)
    Abstract [en]

    Non-Newtonian droplet dynamics commonly exist in microfluidic systems. We report simulations of viscoelastic (VE) droplets traveling in a two dimensional capillary bifurcation channel. A numerical system combining phase field method, VE rheology, and Stokes flow equations is built. As a generic microfluidic two-phase problem, we study how a non-Newtonian droplet that approaches a channel bifurcation will behave. We identify conditions for when a droplet will either split into two or be directed into one of the branches. In particular, we study the importance of the non-Newtonian properties. Our results reveal two different non-Newtonian mechanisms that can enhance splitting and non-splitting of droplets with respect to Newtonian droplets, depending on the size of droplet and capillary number.

  • 311.
    Wang, Yuli
    et al.
    KTH / Jiangsu University, Zhenjiang, Peoples R China.
    Gratadeix, Anthony
    ENSTA ParisTech, Marechaux, France.
    Do-Quang, Minh
    KTH.
    Amberg, Gustav
    KTH.
    Events and conditions in droplet impact: A phase field prediction2016In: International Journal of Multiphase Flow, ISSN 0301-9322, E-ISSN 1879-3533, Vol. 87, p. 54-65Article in journal (Refereed)
    Abstract [en]

    The phenomenon of droplet impact on a smooth, flat, partially wetted surface is studied by phase field simulation. A map of the different impact regimes is constructed for Reynolds numbers ranging from Re = 9 to Re = 9 x 10(4), and Ohnesorge numbers ranging from Oh = 3.3 x 10(-4) to Oh = 1.05. The results are compared with previous experiments from several aspects such as gas bubble entrapment, spreading radius and liquid sheet splashing, etc. The simulation proposes event predictions that are consistent with previous experiments. Our results and discussions give an overview of important characteristics during droplet impact, and provide insights on the droplet spreading after impact.

  • 312.
    Westerlund, Johanna
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Baxter, Alexander
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Do I Look Good In This?: How skilled players look upon cosmetic items in Team Fortress 2 and Dota 22015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With the growing popularity of the ability to customize your characters in video games, cosmetic items are becoming a big part of the gaming experience; games let players pick and choose what to equip on characters and what colors to use. In this study, skilled Team Fortress 2 and Dota 2 players were interviewed to gain a deeper understanding of the players’ experiences with the cosmetic items in their respective games. The games were chosen based on their well established system for cosmetic items and the authors’ previous knowledge of the games. The result yielded individual answers from ten different experienced players and were reviewed and divided into categories based on the patterns seen in the answers. From what could be seen from the results, the skilled players have a positive outlook on cosmetic items and believe that they have more than an aesthetic meaning, like for example that they can be a way to gauge player skill.

  • 313.
    Wibergh, Alexandra
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    En digital publikations skapandeprocess: Dagens funktioner och framtidsvisioner2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project has aimed to produce and design the upcoming edition of the magazine application Scandinavian Architectural Review for the publisher It Is Media Svenska AB in Stockholm. The production has been based on the application’s prior graphic profile and has intended to follow previous appearance and functions without new additions. The entire production has been created using the Adobe InDesign plugin Adobe Digital Publishing Suite. After the production was finished an analysis of the completed application was performed according to a heuristic evaluation, which was based on the twelve design principles of David Benyon in a perspective of human-computer interaction. To support the analytical work an activity diagram was created to get a comprehensive view of the entire disposition of the application. The analysis has resulted in a list of actions and suggestions to improve the application and its usability, which particularly emphasize the need of a clearer design of the interactive elements, an improved system to give the user feedback as well as an increased consistency and flexibility.

  • 314.
    Wigren, Marcus
    et al.
    Södertörn University, School of Communication, Media and it.
    Carlsson, Johan
    Södertörn University, School of Communication, Media and it.
    Sociala fotografer: En studie av bilddelning på sociala medier2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today’s technology offers a variety of ways for people to communicate and interact with each other. This paper is a study of photo sharing through social media networks with a focus on the amateur photographers’ usage of this technology in order to widen the spread of their pictures. A key focus was placed on what kinds of strategies were used, but also on what kind of motivations the photographers had. Using previous research and in depth interviews we’ve managed to combine our own empirical data with our theoretical interpretations and have come to the conclusion that the use of social media in the purpose of reaching out with photos to other people varies greatly depending on the person being asked. Thus, how this technology is used depends wholly on the individual user. However, we have managed to identify some similarities in the usage social media for these purposes. 

  • 315.
    Wiklund, Emelie
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Hollstensson, Therese
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Sociala medier för marknadsföring: En fallstudie om vilka strategier som finns för marknadsföring via Facebook hos svenska researrangörer2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this study, we have examined how Swedish tour operators are using social media as part of their marketing plan. Our purpose was to find out which strategies they use in the area of social marketing. The companies that were examined were Ving, Fritidsresor and Jambo tours, and the social network site that the research focused on was Facebook. The examination was conducted with a content analysis of the companies' Facebook pages and qualitative, structured interviews with the companies. The aim was to compare the various tour operators Facebook pages in order to get a broader overview of the companies marketing strategies. The results varied between the companies, but in many aspects they had similar strategies. The companies primarily use their Facebook pages to disseminate information, but also for communication with their target groups. This is also what previous research shows is an important part of the social media strategy.

  • 316. Wikström, Fredrik
    et al.
    Karlsson, Mikael
    Hållbar utveckling i Värmland: strategier för lokal och regional hållbar utveckling av energisystem i ett femtioårsperspektiv2002Report (Other academic)
  • 317.
    Willner, Sara
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Användning av film i kampanjer mot alkohol och droger: En undersökning av kampanjer genom historien2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report, I describe the practical thesis I conducted during the spring semester of 2015. I have studied the anti-drug / alcohol campaigns. I have studied campaigns from the 70-90's as well as the campaign “There are many reasons not to try drugs”, which was produced 2003-2007. I have also followed the campaign ”Langar Mythology”, which was launched in the spring of 2015. My focus has been on examining the film as a medium when it comes to anti-drug / alcohol campaigns. Why are films used so often in anti-drug campaigns? Do scare tactics work or is humor the smartest approach? I have produced three short films in which I visualized what I concluded in my studies.

  • 318.
    Willner, Sara
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Collman, Clara
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Sociala normer i design: En multimodal webbplatsanalys av svt.se2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this essay we present a study of norms within interaction design. We have analyzied svt.se as an example of a news site with a public service duty. The essay aims so explore and highlight social norms and how they are embedded in the design. We also wanted to examine and evaluate methods and frameworks for studying websites as cultural expressions and carriers of social norms. To illustrate the purpose of the study, we have used guidelines for accessibility on web interfaces that SVT relate to in their website design. The study was based on a multimodal framework for analyzing websites and grounded theory. The study showed that svt.se provides an accessible interface that follows the guidelines the interface is said to relate to. We also saw a clear convention regarding how current events where depicted where both content and design interacted. The study also showed that the gender distribution on images on svt.se was even, but the images of non-white people and people with functional variants were less common.

  • 319.
    Winkler, C.
    et al.
    KTH.
    Amberg, Gustav
    KTH.
    Multicomponent surfactant mass transfer in GTA-welding2005In: Progress in Computational Fluid Dynamics, An International Journal, ISSN 1468-4349, E-ISSN 1741-5233, Vol. 5, no 05-mar, p. 190-206Article in journal (Refereed)
    Abstract [en]

    A mathematical model simulating multicomponent, surfactant mass transfer in the liquid region arising in the specimen directly beneath the electrode during GTA-welding is developed. The sorption controlled surfactant mass transfer is due to convection and diffusion in the surface and bulk liquid regions. Interaction coefficients and multicomponent Langmuir adsorption isotherms are used to consider the interaction between the several surfactants involved. The model is added to a mathematical formulation that is often used for GTA-welding, and is finally used to calculate the fluid and heat flow and surfactant distributions in the weld pool. In the simulations, GTA-welding on stainless steel plates for a ternary Fe-S-O system is considered for varying surfactant concentrations and for varying heat input conditions. A very good agreement between numerically obtained and corresponding experimental weld pool shapes is found. Thus, it is shown that previous shortcomings in modelling of GTA-welding can be overcome if multicomponent surfactant mass transfer is considered.

  • 320.
    Winkler, C.
    et al.
    KTH.
    Amberg, Gustav
    KTH.
    Carlberg, T.
    Mid Sweden University.
    Radial segregation due to weak convection in a floating zone2000In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 210, no 4, p. 573-586Article in journal (Refereed)
    Abstract [en]

    The influence of weak convection, caused by surface tension forces, on radial dopant segregation occurring in crystals grown under microgravity conditions is studied numerically. The geometry considered corresponds to a floating-zone configuration with partially coated melt surfaces consisting of small evenly distributed spots of free surfaces. In order to distinguish dopant distribution due to weak convection clearly from distribution due to diffusion the spots only cover one quarter of the periphery. Thus, surface tension-driven convection is allowed only over one quarter of the floating-zone configuration resulting in an asymmetric dopant distribution. The percentage of free surfaces present is varied in order to alter the Marangoni flow rates. The maximum dopant concentration due to radial segregation is plotted as a function of a certain convection level. The results of the present numerical study are supposed to be used to design corresponding space experiments launched at the end of the year 2000.

  • 321.
    Winkler, C.
    et al.
    Nippon Steel Corp.,Chiba, Japan / KTH.
    Amberg, Gustav
    KTH.
    Inoue, H.
    Nippon Steel Corp.,Chiba, Japan.
    Koseki, T.
    Nippon Steel Corp., Oita, Japan.
    Fuji, M.
    Nippon Steel Corp.,Chiba, Japan.
    Effect of surfactant redistribution on weld pool shape during gas tungsten arc welding2000In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 5, no 1, p. 8-20Article in journal (Refereed)
    Abstract [en]

    In previous evaluations, of GTA welding stainless steel plates the surfactant content in the workplace has been assumed to be in a state of equilibrium. However surfactant concentration usually had to be adjusted in order to achieve agreement between the weld pool shapes in experiments and those in simulations. In this study a physiochemical approach to the redistribution of surfactant at the surface and in the bulk is presented for the first time. Sulphur was considered as a represenative surfactant. The model allows surfactant molecular transport via convection, diffusion, and sorption. It is shown that sulphur atoms accumulate at the surface at stagnation points, affecting the coefficient of surface tension and thus the final weld pool shape. Thus, the sulphur content in the simulation approaches the nominal sulphur content in the steel plate. The theory is strenghtened by both electron probe microanalysis and Auger electron spectroscopy. At the time the work was carried out, Mr Winkler, Dr Inoue and Mr Fuji were at the Welding and Joining Reserach Center, Steel Reserach Laboratories, Technical Development Bureau, Nippon Steel Corp., 20-1 Shintomi, Futtsu, Chiba 293, Japan, Dr Amberg was in the Department of Mechanics, Royal Institute of Technology, Osquars Backe 18, 100-44 Stockholm, Sweden, and Dr Koseki was at the Oita R&D Laboratories, Nippon Steel Corp., 1 Nishinosu, Oita 870, Japan. Mr Winkler is now in the Department of Mechanics, Royal Institute of Technology, Manuscript received 4 March 1999; accepted 8 April 1999.

  • 322.
    Woch, Tomasz
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Agdelius, David
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Fysiskt eller digitalt?: En studie om konsolanvändarnas inställning till det digitala och fysiska spelformatet2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Downloadable games are more common these days than they were a decade ago. The prowess of broadband has made it possible to quickly download games and the market for digital games is growing steady. In this paper we study if the attitude towards digital console games differentiates from physical console games due to the growing digital market. We present and discuss console users’ attitude towards digital and physical games and their perceived value. From the quantitative studies performed we show that people prefer physical console games over digital, even though the digital market is on a steady climb. Based on the results we found the most common cause for the preference of physical copies was the possibilities the physical format entailed, such as trad- ing, exhibiting, refunding or borrowing. 

  • 323.
    Yeddu, Hemantha Kumar
    et al.
    KTH.
    Malik, Amer
    KTH.
    Ågren, John
    KTH.
    Amberg, Gustav
    KTH.
    Borgenstam, Annika
    KTH.
    Three-dimensional phase-field modeling of martensitic microstructure evolution in steels2012In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 60, no 4, p. 1538-1547Article in journal (Refereed)
    Abstract [en]

    In the present work a 3-D elastoplastic phase-field (PF) model is developed, based on the PF microelasticity theory proposed by A.G.Khachaturyan and by including plastic deformation as well as anisotropic elastic properties, for modeling the martensitic transformation (MT) by using the finite-element method. PF simulations in 3D are performed by considering different cases of MT occurring in an elastic material, with and without dilatation, and in an elastic perfectly plastic material with dilatation having isotropic as well as anisotropic elastic properties. As input data for the simulations the thermodynamic parameters corresponding to anFe–0.3%C alloy as well as the physical parameters corresponding to steels acquired from experimental results are considered. The simulation results clearly show auto-catalysis and morphological mirror image formation, which are some of the typical characteristics of a martensitic microstructure. The results indicate that elastic strain energy, anisotropic elastic properties, plasticity and the external clamping conditions affect MT as well as the microstructure.

  • 324.
    Zerega Bravo, Rafael
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Descriptive Study on the Use of Bimanual and Same-hand Multifinger Interaction on a Multitouch Display2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Multitouch technology allows the users to use both their hands and multiple fingers to manipulate digital content directly on the screen. This paper attempts to analyze the actual convenience of bimanual and multifinger manipulation on a multitouch display by conducting three observational experiments and studying how a group of volunteers use their hands and fingers when interacting with digital content on a touchscreen surface. In addition, the participants had to fill in a questionnaire where they give some additional insights on how they experienced the use of multitouch-based interface during the experiments. The results suggest that when participants were performing tasks in which they were instructed to manipulate the digital content as fast as they could, a high percentage of them resorted to the use of at least some level of bimanual manipulation of the digital content. However, when participants were told to perform the tasks calmly the big majority of participants decided to move the objects by using only one hand (unimanual). Same-hand multifinger manipulation was also used by a high percentage of participants when moving several objects simultaneously. Nevertheless, in all three experiments the most common way of moving objects across the screen was by dragging them one at a time (sequential move). Finally, in relation to the personal assessment made by the participants, a total of 70% feel that the possibility for engaging in bimanual interaction, that multitouch interface offers, is a clear benefit and advantage over traditional keyboard and mouse. However, 40% of the respondents feel that the use of mouse still is a more effective and natural form of interaction than multitouch technology. 

  • 325.
    Zerega Bravo, Rafael
    et al.
    Södertörn University, School of Communication, Media and it.
    Lazarov, Borislav
    Södertörn University, School of Communication, Media and it.
    To touch or not to touch: A comparison between traditional and touchscreen interface within personal computers2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Touchscreen technology is gradually becoming more popular and massive in our present society to the point where it is hard to find a person that has never used this interface system. Handheld devices such as mobile phones and tablets are predominantly based on touchscreens as the main way to interact with them. Nevertheless, that is not the case when it comes to personal computers either desktop machines or laptops which are still chiefly based on traditional keyboard and mouse as their main input system.

    In this study we explore the potential that touchscreen based interface can offer for personal computers carrying through an observational experiment with six participants that were asked to perform a list of tasks using both traditional keyboard-mouse interface and touchscreen interface. The measurements during the observation concerned time and error rate for every task. Each participant was interviewed right after the completion of the observational phase in order to get a qualitative insight on their views and perceptions regarding both interfaces. The data collected was analyzed based on some existing models within touchscreen interface and human-computer interaction that have been elaborated in previews research. The final results led to the conclusion, that touchscreen-based interface proved to be slower and have higher error rate than traditional interface in a big number of the tasks performed by the participants. Similarly, the general perception of the people towards having touchscreen on a personal computer still seems a bit doubtful, although they do see some concrete positive aspects about this interface. Nevertheless, touchscreen outperformed traditional interface in some particular tasks. This implies that touchscreen interface has a clear potential for personal computers that would let users utilize these machines in a much broader and more interactive way than people do it today with the traditional keyboard-mouse interface. 

  • 326.
    Zetterman, Madeleine
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Projektledning: En studie om en effektiviserad projektledningsmetod till TS Produktion2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The term "Project" have become a growing work model that exist in almost all bransches. A project is a work effort made over a finite period of time with a start and a finish to create a unique product, service, or result. Science shows that time limitation has an impact on humans to perform under pressure, which challanges the contributor to deliver. This report contains an examination about project management, both coming from scientific results and an external business. The point of this study is to bring ideas of improvement, which can make the work method more effective in this company.

  • 327.
    Zivanovic, Ivan
    Södertörn University, School of Communication, Media and it.
    Gyroscope based augmented reality2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper describes the development of augmented reality system using the sensor and Bluetooth technologies incorporated together with a 3D program. The system is used to produce a virtual reality that can be augmented through the projector device into real world. The concept is to create 3D environment where the virtual camera, which is placed within the 3D environment, would be controlled by the external controller in real time. The movement of the camera is controlled by the motion of the controller; therefore the projection of the 3D environment corresponds to the position of the controller. The paper also discusses research part of the project and the findings related to the users’ evaluations of the system.

  • 328.
    Zlamaniec Lindh, Bartek
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Attraktiv och trovärdig karaktärsdesign: En kvalitativ studie med tre professionella spelgrafiker2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet för denna studie var att explorativt undersöka vad som ansågs som god visuellkaraktärsdesign enligt svenska spelgrafiker hos två olika studios. Med inspiration avtidigare forskning inom området var målet att utröna vad de ansåg var trovärdig ochattraktiv design, utifrån deras erfarenheter som professionella karaktärsdesigner. Tregrafiker med olika erfarenhet av karaktärsdesign valdes ut och intervjuades. Resultatetvisade att attraktivitet och trovärdighet kunde appliceras på hur designerna skapadesina karaktärer, men på olika sätt och beroende på vilket spel de arbetade på. Iblandvar det spelarna som hade tolkningsföreträde på vad som var god karaktärsdesign,medan i andra fall karaktärsdesignern själv. Studien gav flera exempel på hur man kanarbeta för att förbättra sin karaktärsdesign för grafiker som ämnar till att blikaraktärsdesigners och en insyn i de förväntningar man som professionell kan mötainom fältet.

  • 329.
    Åberg, Sabina
    et al.
    Södertörn University, School of Communication, Media and it.
    Larsson Åkerman, Matilda
    Södertörn University, School of Communication, Media and it.
    Användning av smartphones inom högre utbildning: En kvantitativ studie om attitydskillnader mellan studenter och lärare2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Experts argue that smartphones will become increasingly common in higher education (University Level), thereby making teaching more flexible and accessible to students. A smartphone works like a PDA and you can use it to read email, surf the Internet, log on to social networks such as Facebook and Twitter, read news, play games, solve crossword puzzles, shoot and record videos, and more.

    The aim of this thesis was to examine the differences in attitudes between students and teachers as well as men and women on the use of smartphones in higher education. As for students and teachers, Prensky's (2001) theory of digital natives and digital immigrants was used. In this sense, we wanted to find out if there were significant differences between those who were born in 1980 or later and those who were born before 1980.

    The results reveal that students have a more positive attitude towards the use of smartphones in higher education compared to teachers. They also show that women have a more positive attitude towards the use of smartphones in higher education compared to men.

  • 330.
    Önnerdal, Joakim
    et al.
    Södertörn University, School of Communication, Media and it.
    Magnus, Lindberg
    Södertörn University, School of Communication, Media and it.
    Grafisk helhetslösning för Resize Design2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    This report describes and explains the development of a comprehensive solution including visual identity, print catalog, website and online shop for the furniture company Resize Design. The development and production of these have occurred in the iterative processes with relevant theories as a basis. The theories include user-centered work processes, usability, design principles, interaction design, design patterns and web-compatible solutions. The report documents and discusses the work which is divided into different phases. 

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