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  • 25601.
    Wylleman, Paul
    et al.
    Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussel, Belgium.
    Stambulova, Natalia
    P.F. Lesgaft State Academy of Physical Education, St.-Petersburg, Russia.
    Biddle, Stuart
    Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Loughborough, UK.
    Career transitions in sport: Research and interventions1999In: Psychology of Sport and Exercise: Enhancing the Quality of Life, Proceedings of the 10th European Congress of Sport Psychology – FEPSAC, Part 2 / [ed] V. Hosek, P. Tilinger, & L. Bilek, Prague: Charles University , 1999, p. 301-303Conference paper (Refereed)
  • 25602.
    Wändal, Catarina
    et al.
    Halmstad University, School of Health and Welfare.
    Leijbertz, Natalie
    Halmstad University, School of Health and Welfare.
    Det gäller ju att hänga med...: seniorers upplevelser av e-tjänster2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syfte och frågeställningar: Studiens syfte är att studera hur seniorer upplever användandet av e-tjänster för att få förståelse för hur digitala tjänster används i seniorers vardag.

    -      Hur kan seniorers upplevelser av e-tjänster i vardagen förstås utifrån domesticeringsteorins processer? 

    -      Hur kan seniorer som mottagare förstås av digitala tjänsters utmaningar och potential utifrån Rogers teori om innovationsspridning? 

     

    Metod och material: En kvalitativ studie med fokusgruppsintervjuer för insamling av empiri. 

    Huvudresultat: Resultatet visade att seniorerna upplever e-tjänster som bekväma, tidsbesparande och underlättar vardagen. Ett enkelt sätt att få och tillgå information igenom samt kommunicera. Utmaningar var när tekniken upplevdes svår samt att bryta traditioner och vanor de trivdes med. Resultatet visar också att det måste finns intresse för e-tjänsten hos seniorerna och att tekniken uppfyller ett behov. Tekniken och e-tjänster ingår till stora delar i seniorers vardag men vilka e-tjänster de använde skilde sig emellan individerna. 

  • 25603.
    Wändesjö, Sandra
    Halmstad University, School of Social and Health Sciences (HOS).
    Piloter och stress1999Student paper second termStudent thesis
  • 25604.
    Wärn, Anton
    Halmstad University, School of Education, Humanities and Social Science.
    Adapting THIEVES in the ESL classroom: Adapting a pre-reading strategy using lyrics in the ESL classroom2019Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this essay is to test how a teacher can use a pre-reading strategy in the ESL classroom. The pre-reading strategy will be used with song lyrics instead of the usual classroom textbooks.

    The reaserch questions for this essay are

    Does the pre-reading strategy “THIEVES” give any results when teaching English as a second language in the classroom?

    Can any results be discerned after six weeks of working with this pre-reading strategy in a Swedish ESL classroom context?

    Do students find it easier to work with song lyrics rather than other types of texts?

  • 25605.
    Wärn, Anton
    Halmstad University, School of Education, Humanities and Social Science.
    Rasism i amerikansk hiphop: En innehållsanalys av hur rasism framställs i amerikansk hiphop på 2010-talet2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay will analyse how racism is represented in hip-hop lyrics from the first 7 years of the 2010th decade. The lyrics will be divided into four various categories to show how the artist is using history to connect with the listener.

    When analysing the lyrics, a content analysis will be used were the lyrics are broken down into smaller parts. These smaller parts will be broken down and the valuable information is extracted. When doing this analysis, it is important to not break the lyrics into too small parts, if done the context can be lost.

  • 25606.
    Wärnestål, Pontus
    Linköping University, Linköping, Sweden.
    Dialogue Behavior Management in Conversational Recommender Systems2007Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This thesis examines recommendation dialogue, in the context of dialogue strategy design for conversational recommender systems. The purpose of a recommender system is to produce personalized recommendations of potentially useful items from a large space of possible options. In a conversational recommender system, this task is approached by utilizing natural language recommendation dialogue for detecting user preferences, as well as for providing recommendations. The fundamental idea of a conversational recommender system is that it relies on dialogue sessions to detect, continuously update, and utilize the user's preferences in order to predict potential interest in domain items modeled in a system. Designing the dialogue strategy management is thus one of the most important tasks for such systems.

    Based on empirical studies as well as design and implementation of conversational recommender systems, a behavior-based dialogue model called bcorn is presented. bcorn is based on three constructs, which are presented in the thesis. It utilizes a user preference modeling framework (preflets) that supports and utilizes natural language dialogue, and allows for descriptive, comparative, and superlative preference statements, in various situations. Another component of bcorn is its message-passing formalism, pcql, which is a notation used when describing preferential and factual statements and requests. bcorn is designed to be a generic recommendation dialogue strategy with conventional, information-providing, and recommendation capabilities, that each describes a natural chunk of a recommender agent's dialogue strategy, modeled in dialogue behavior diagrams that are run in parallel to give rise to coherent, flexible, and effective dialogue in conversational recommender systems.

    Three empirical studies have been carried out in order to explore the problem space of recommendation dialogue, and to verify the solutions put forward in this work. Study I is a corpus study in the domain of movie recommendations. The result of the study is a characterization of recommendation dialogue, and forms a base for a first prototype implementation of a human-computer recommendation dialogue control strategy. Study II is an end-user evaluation of the acorn system that implements the dialogue control strategy and results in a verification of the effectiveness and usability of the dialogue strategy. There are also implications that influence the refinement of the model that are used in the bcorn dialogue strategy model. Study III is an overhearer evaluation of a functional conversational recommender system called CoreSong, which implements the bcorn model. The result of the study is indicative of the soundness of the behavior-based approach to conversational recommender system design, as well as the informativeness, naturalness, and coherence of the individual bcorn dialogue behaviors.

  • 25607.
    Wärnestål, Pontus
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Formal Learning Sequences and Progression in the Studio: A Framework for Digital Design Education2016In: Journal of Information Technology Education: Innovations in Practice, ISSN 2165-3151, E-ISSN 2165-316X, Vol. 15, no 1, p. 35-52Article in journal (Refereed)
    Abstract [en]

    This paper examines how to leverage the design studio learning environment throughout longterm Digital Design education in order to support students to progress from tactical, well-defined, device-centric routine design, to confidently design sustainable solutions for strategic, complex, problems for a wide range of devices and platforms in the digital space. We present a framework derived from literature on design, creativity, and theories on learning that: (a) implements a theory of formal learning sequences as a user-centered design process in the studio; and (b) describes design challenge progressions in the design studio environment modeled in seven dimensions. The framework can be used as a tool for designing, evaluating, and communicating course progressions within – and between series of – design studio courses. This approach is evaluated by implementing a formal learning sequence framework in a series of design studio courses that progress in an undergraduate design-oriented Informatics program. Reflections from students, teachers, and external clients indicate high student motivation and learning goal achievement, high teacher satisfaction and skill development, and high satisfaction among external clients.

  • 25608.
    Wärnestål, Pontus
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Kan man föreläsa på ett bibliotek?: Kombinerad lärande- och designmiljö på fältet2012In: NU2012: Gränslöst lärande: Göteborg 17-19 oktober 2012: konferenskatalog, 2012, p. 29-31Conference paper (Refereed)
  • 25609.
    Wärnestål, Pontus
    Department of Computer Science, Linköping University, Linköping, Sweden.
    Modeling a Dialogue Strategy for Personalized Movie Recommendations2005In: Beyond Personalization 2005: A Workshop on the Next Stage of Recommender Systems Research: San Diego, January 9, 2005 / [ed] Mark van Setten, Sean McNee & Joseph Konstan, 2005, p. 77-82Conference paper (Refereed)
    Abstract [en]

    This paper addresses conversational interaction in user-adaptive recommender systems. By collecting and analyzing a movie recommendation dialogue corpus, two initiative types that need to be accommodated in a conversational recommender dialogue system are identified. The initiative types are modeled in a dialogue strategy suitable for implementation. The approach is exemplified by the MADFILM movie recommender dialogue system.

  • 25610.
    Wärnestål, Pontus
    Department of Computer and Information Science, Linköping University, Linköping, Sweden.
    Modularized User Modeling in Conversational Recommender Systems2005In: User Modeling 2005: 10th International Conference, UM 2005, Edinburgh, Scotland, UK, July 24-29, 2005. Proceedings / [ed] Liliana Ardissono, Paul Brna & Antonija Mitrovic, Berlin: Springer Berlin/Heidelberg, 2005, p. 527-529Conference paper (Other academic)
    Abstract [en]

    My research interest lies in investigating user-adaptive interaction in a conversational setting for recommender systems, with particular focus on modularized user model components and the use of a dialogue partner (DP) in such systems. © Springer International Publishing AG, Part of Springer Science+Business Media 2005

  • 25611.
    Wärnestål, Pontus
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Studio Course Progression in Digital Design Education2013Conference paper (Refereed)
    Abstract [en]

    This paper examines how to leverage the design studio learning environment throughout long-term education in order to support students to progress from tactical, well-defined, device-centric routine design, to confidently design sustainable solutions for strategic, “wicked”, and device-agnostic problems. We present a model that describes design challenge progressions in the design studio environment based on six dimensions derived from literature on design, creativity, and theories on learning. This contribution can be used as a tool for designing course progressions within – and between – series of design studio courses, and is exemplified with a four-step studio progression in a three-year undergraduate design-oriented informatics program.

  • 25612.
    Wärnestål, Pontus
    Department of Computer Science, Linköping University, Linköping, Sweden.
    User Evaluation of a Conversational Recommender System2005In: 4th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems: Edinburgh, Scotland: August 1, 2005 / [ed] Ingrid Zukerman, Jan Alexandersson & Arne Jönsson, 2005, p. 32-39Conference paper (Refereed)
    Abstract [en]

    Conversational recommender systems (CRSs) approach user preference acquisition from a conversational point of view, where preferences are captured and put to use in the course of on-going natural language dialogue. The approach is motivated by its aim to make interaction efficient and natural, to acquire preferences from the user in a context when she is motivated to give them, as well as to facilitate exploration of the domain and the development of the user’s preferences. A CRS’s dialogue strategy to achieve these aspects of the interaction is crucial for its performance and usability. This paper reports on a user satisfaction evaluation of ACORN, which is a CRS in the movie domain. The results of the study indicate a high user satisfaction with the interaction from nine usability aspects, and that ACORN’s dialogue strategy is suitable for efficient interaction and user preference modeling, and facilitates domain exploration.

  • 25613.
    Wärnestål, Pontus
    et al.
    Department of Computer Science, Linköping University, Sweden.
    Degerstedt, Lars
    Department of Computer Science, Linköping University, Sweden.
    Jönsson, Arne
    Department of Computer Science, Linköping University, Sweden.
    Emergent Conversational Recommendations: A Dialogue Behavior Approach2007In: Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue / [ed] Simon Keizer, Harry Bunt, Tim Paek, East Stroudsburg, USA: Association for Computational Linguistics, 2007, p. 63-66Conference paper (Refereed)
    Abstract [en]

    This paper presents and evaluates a behavior-based approach to dialogue management, where a system's complete dialogue strategy is viewed as the result of running several dialogue behaviors in parallel leading to an emergent coherent and flexible dialogue behavior. The conducted overhearer evaluation of the behavior-based conversational recommender system CORESONG indicates that the approach can give rise to informative and coherent dialogue; and that a complete dialogue strategy can be modeled as an emergent phenomenon in terms of lower-level autonomous behaviors for the studied class of recommendation dialogue interaction. © 2007 Association for Computational Linguistics.

  • 25614.
    Wärnestål, Pontus
    et al.
    Department of Computer Science Linköping University, Sweden.
    Degerstedt, Lars
    Department of Computer Science Linköping University, Sweden.
    Jönsson, Arne
    Department of Computer Science Linköping University, Sweden.
    Interview and delivery: Dialogue strategies for conversational recommender systems2007In: Proceedings of the 16th Nordic Conference of Computational Linguistics NODALIDA 2007 / [ed] Joakim Nivre, Heiki-Jaan Kaalep, Kadri Muischnek, Mare Koit, Tartu, Estonia: University of Tartu, 2007, p. 199-205Conference paper (Refereed)
    Abstract [en]

    In our work with conversational recommender systems we have derived two dialogue strategiescalled interview and delivery. We explorethe symmetry between preferential interview andtraditional clarification questions, and arrive atbasic interview and delivery strategies suitablefor conversational recommender system implementations.The strategies are based on a corpusanalysis of recommendation dialogues inthe movie domain. We illustrate the strategiesin a conversational music recommender systemcalled CORESONG.

  • 25615.
    Wärnestål, Pontus
    et al.
    Department of Computer and Information Science Linköping University, Sweden.
    Degerstedt, Lars
    Department of Computer and Information Science Linköping University, Sweden.
    Jönsson, Arne
    Department of Computer and Information Science Linköping University, Sweden.
    PCQL: A Formalism for Human-Like Preference Dialogues2007In: IJCAI 07: 5th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems: Workshop Proceedings, 2007, p. 46-54Conference paper (Refereed)
    Abstract [en]

    Preference dialogues display several interestin gcharacteristics that have implications on how to design human-like dialogue strategies in conversational recommender systems. Using human-human preference dialogues as an empirical base, this paper introduces a novel data manipulation language calledPCQLthat comprises explicit descriptive, comparative and superlative preference management as well as implicit preference statements such as factual information queries. The usage of the PCQL language is demonstrated by an implementation of a music conversational recommender system.

  • 25616.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Kronlid, Fredrik
    Talkamatic AB, Gothenburg, Sweden.
    Towards a user experience design framework for adaptive spoken dialogue in automotive contexts2014In: IUI'14: 19th International Conference on Intelligent User Interfaces: Haifa, Israel – February 24-27, 2014, New York, NY: ACM Press, 2014, p. 305-310Conference paper (Refereed)
    Abstract [en]

    We present an initial set of design principles for designing efficient, effective, coherent, and desirable adaptive spoken interaction for traffic information and navigation. The principles are based on a qualitative analysis of driver interactions with an adaptive speech prototype along with driver interviews. The derived set of principles range from high-level fundamental design values, conceptual and behavioral principles, to low-level interface-level principles that can guide the design of adaptive spoken dialogue interaction in the car from a user experience perspective. © 2014 ACM.

  • 25617.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Lindqvist, Mats
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Course Structuring for Procedural Knowledge in Interaction Design Education2012In: IRIS 35: Proceedings of the 35th Information Systems Research Seminar in Scandinavia: Designing the Interactive Society, Uppsala: Department of Informatics and Media, Uppsala University , 2012Conference paper (Refereed)
    Abstract [en]

    Society’s use of increasingly complex information technology is, in a long-term perspective, shaped by the way we train our future designers and developers of information systems. By preparing students for practice on the field, in complex use-contexts, we aim to help student’s bridge theory and practice, thereby helping them incorporate procedural knowledge and reflective practice in their skill repertoire. This paper presents a new course structure founded on active, contextual, and peer-based formative learning. Based on student and teacher reflections from two implementations of a course in Interaction Design, we find that our approach enhances the students’ understanding, and assimilation, of the reflective aspect of interaction design practice.

  • 25618.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Lindqvist, Mats
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Designerly Ways of Teaching and Learning: A Course Structure for Interaction Design2013In: Journal of Learning in Higher Education, ISSN 1936-346X, Vol. 9, no 1, p. 179-188Article in journal (Refereed)
    Abstract [en]

    Society´s use of increasingly complex information technology is, in a long-term perspective, shaped by the way we train our future designers and developers of information systems. By preparing students for practice on the field, in complex use-contexts, we aim to help student’s bridge theory and practice, thereby helping them incorporate procedural knowledge and reflective practice in their skill repertoire. This paper presents a new course structure founded on active, contextual, and peer-based formative learning. Based on student and teacher reflections from two implementations of a course in Interaction Design, we find that our approach enhances the students’ understanding, and assimilation, of the reflective aspect of interaction design practice.

  • 25619.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Lindqvist, Mats
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Designerly Ways of Teaching and Learning: A Course Structure for Interaction Design2012In: Joint International Conferences 2012 Academic Business World International Conference & International Conference on Learning and Administration in Higher Education: Proceedings, 2012, p. 79-79Conference paper (Refereed)
  • 25620.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Nygren, Jens M
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Building an Experience Framework for a Digital Peer Support Service for Children Surviving from Cancer2013In: Proceedings of Interaction Design and Children (IDC'13), New York, NY: Association for Computing Machinery (ACM), 2013, p. 269-272Conference paper (Refereed)
    Abstract [en]

    Childhood cancer survivors adjust to the physical, mental, and social difficulties associated with their illness and treatment. This process can be facilitated by social support from peers. For children, this is often problematic due to geographical, clinical, and age-related limitations. This paper reports on a stakeholder assessment study that confirms the relevance of a digital peer support service for childhood cancer survivors. The analysis establishes where in the existing health care process the digital peer support service should be introduced, what actors play a key role in facilitating service onboarding and use, and characterizes desirable user experience qualities. The analysis also yields a collection of design challenges to be addressed in the development of the digital peer support service. Copyright 2013 ACM.

  • 25621.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Svedberg, Petra
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Lindberg, Susanne
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Nygren, Jens M.
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Effects of Using Child Personas in the Development of a Digital Peer Support Service for Childhood Cancer Survivors2017In: Journal of Medical Internet Research, ISSN 1438-8871, E-ISSN 1438-8871, Vol. 19, no 5, article id e161Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Peer support services have the potential to support children who survive cancer by handling the physical, mental, and social challenges associated with survival and return to everyday life. Involving the children themselves in the design process allows for adapting services to authentic user behaviors and goals. As there are several challenges that put critical requirements on a user-centered design process, we developed a design method based on personas adapted to the particular needs of children that promotes health and handles a sensitive design context.

    OBJECTIVE: The purpose of this study was to evaluate the effects of using child personas in the development of a digital peer support service for childhood cancer survivors.

    METHODS: The user group's needs and behaviors were characterized based on cohort data and literature, focus group interviews with childhood cancer survivors (n=15, 8-12 years), stakeholder interviews with health care professionals and parents (n=13), user interviews, and observations. Data were interpreted and explained together with childhood cancer survivors (n=5) in three explorative design workshops and a validation workshop with children (n=7).

    RESULTS: We present findings and insights on how to codesign child personas in the context of developing digital peer support services with childhood cancer survivors. The work resulted in three primary personas that model the behaviors, attitudes, and goals of three user archetypes tailored for developing health-promoting services in this particular use context. Additionally, we also report on the effects of using these personas in the design of a digital peer support service called Give Me a Break.

    CONCLUSIONS: By applying our progressive steps of data collection and analysis, we arrive at authentic child-personas that were successfully used to design and develop health-promoting services for children in vulnerable life stages. The child-personas serve as effective collaboration and communication aids for both internal and external purposes.

  • 25622.
    Wärnestål, Pontus
    et al.
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Svedberg, Petra
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Nygren, Jens
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Co-constructing Child Personas for Health-Promoting Services with Vulnerable Children2014In: CHI '14 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Toronto, ON, Canada: ACM Press, 2014, p. 3767-3776Conference paper (Refereed)
    Abstract [en]

    The availability of health-promoting resources for young children diagnosed with cancer who are transitioning from intensive care to everyday life is limited. In the context of designing digital peer support services for children who are considered vulnerable due to clinical and age-related aspects, there are several challenges that put critical requirements on a user-centered design process. This paper reports on a new method for co-constructing child-personas that are tailored for developing health-promoting services where empirical data is restricted due to practical and ethical reasons. In particular, we are proposing to focus children design workshop sessions on salutogenesis, and complement this with a pathogenic perspective by interviewing healthcare professionals and parents. We also introduce the use of proxy personas, and redemption scenarios in the form of comicboards, both collaboratively constructed by children and designers through storytelling. By applying four progressive steps of data collection and analysis we arrive at authentic child-personas that can be used to design and develop health-promoting services for children in vulnerable life stages.

  • 25623.
    Wärnström, Mathias
    Halmstad University, School of Business, Engineering and Science.
    The effects of Foam Rolling and Static Stretching on bilateral forward jumping ability and flexibility of the hamstrings musculature2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Foam rolling (FR) is a promising new trend in the world of resistance training, sports and  athletics. It is often used as a warm up activity as a substitute or addition to  stretching modalities such as static stretching (SS). The proposed benefits behind FR is that it can lead to  both acute and chronic increases in performance and flexibility. Aim: The aim of this study was to investigate the effects of two different warm­up intervention protocols  of the hamstrings musculature on: 1) Performance in the bilateral standing long jump 2) Flexibility in a  supine active­knee­extension test. Method: The study consisted of sixteen male participants who were all healthy adult recreational athletes.  The two different interventions were, a) Static Stretching protocol (SS) and b) a Foam Rolling protocol  (FR). These were compared to a baseline warm up (BLWU). The SS consisted of 1 x 30 seconds of active  SS using the lying supine active­knee­extension position after a short warm­up. The FR consisted of 1  bout of 30 seconds of FR of the hamstrings musculature of each leg after a short warm­up. BLWU  consisted of a short warm­up (5 submaximal bilateral standing long jumps). Performance was measured  using a bilateral standing long jump test. Flexibility was measured with a goniometer using a lying supine active ­knee­ extension test. The student’s t­test was used to study differences between and within groups (BLWU, SS, FR). Results: No differences between BLWU and Post­SS (p=0.89) as well as BLWU compared to Post­FR (p=0.86) was detected for performance. However, an increase in flexibility was shown favoring Post­SS over BLWU (p=0.021) as well as Post­FR over BLWU (p=0.045). No significant difference was seen  between changes in the Post­SS and Post­FR groups in either performance or flexibility (p=0.887 and  p=0.944 respectively). Conclusion: It seems that both SS and FR are similarly viable and effective methods for acute increases  in flexibility in the active­knee­extension test without subsequent decreases in performance of the bilateral standing long jump.  

  • 25624.
    Wästberg, Birgitta
    et al.
    Department of Health Sciences, Division of Occupational Therapy and Gerontology, Lund University, Lund, Sweden.
    Erlandsson, Lena-Karin
    Department of Health Sciences, Division of Occupational Therapy and Gerontology, Lund University, Lund, Sweden.
    Eklund, Mona
    Department of Health Sciences, Division of Occupational Therapy and Gerontology, Lund University, Lund, Sweden.
    Client perceptions of a work rehabilitation programme for women: The Redesigning Daily Occupations (ReDO) project2013In: Scandinavian Journal of Occupational Therapy, ISSN 1103-8128, E-ISSN 1651-2014, Vol. 20, no 2, p. 118-126Article in journal (Refereed)
    Abstract [en]

    Aim: The Redesigning Daily Occupations programme (ReDO) is a Swedish work rehabilitation programme for women on sick leave due to stress-related disorders. The aim of the study was to investigate the participants' perceptions of taking part in the work rehabilitation programme. Methods: Seven of the 38 women who completed ReDO were interviewed during and after the programme. The interviews were analysed by manifest and latent content analysis. Results: The informants were satisfied with the content of the programme and the support they received in the programme and when returning to work. The women thought they had become more aware of what they did during a day and how they performed their daily activities, which helped them to change their ways of performing them. The result highlighted different parts of their rehabilitation process which constituted four sub-themes: "Perceptions of the ReDO", "The intrinsic process", "Person-related changes", and "Perceptions of returning to work", and formed the core theme "Critical parts of the rehabilitation process". Conclusions: The findings may not be generalized to other settings and future research should further investigate work rehabilitation for the target group. © 2013 Informa Healthcare.

  • 25625.
    Wästberg, Birgitta
    et al.
    Department of Health Sciences, Lund University, Lund, Sweden & Skåne University Hospital, Malmö-Lund, Lund, Sweden.
    Erlandsson, Lena-Karin
    Department of Health Sciences, Lund University, Lund, Sweden.
    Eklund, Mona
    Department of Health Sciences, Lund University, Lund, Sweden.
    Women's perceived work environment after stress-related rehabilitation: Experiences from the ReDO project2016In: Disability and Rehabilitation, ISSN 0963-8288, E-ISSN 1464-5165, Vol. 38, no 6, p. 528-534Article in journal (Refereed)
    Abstract [en]

    Purpose: The study aimed to investigate (a) if womens perceptions of their work environment changed during a 16-week rehabilitation period and at a 12-month follow-up; (b) whether such changes were related to outcomes in terms of return to work, well-being and valued occupations. Methods: Eighty-four gainfully employed women on sick-leave due to stress-related disorders responded to instruments assessing perceptions of the work environment, well-being (self-esteem, self-mastery, quality of life, perceived stress, self-rated health) and perceived occupational value. Data about return to work were collected from registers. Non-parametric statistics were used. Results: The increase in the womens ratings of their work environmentwas non-significant between baseline and completed rehabilitation but was statistically significant between baseline and the 12-month follow-up. No relationships were found between changes in perceptions of the work environment and outcomes after the rehabilitation. At the follow-up, however, there were associations between perceived work environment changes in a positive direction and return to work; improved self-esteem, self-mastery, quality of life, perceived occupational value and self-rated health; and reduced stress. Conclusion: It seems important to consider the work environment in rehabilitation for stress-related problems, and a follow-up appears warranted to detect changes and associations not visible immediately after rehabilitation.Implications for RehabilitationWork environmentPerceptions of the work environment seem important for return to work, although other factors are likely to contribute as well.Perceptions of the work environment are associated with several aspects of well-being.When developing rehabilitation interventions a focus on the clients' perceptions of their work environment seems vital. © 2015 Informa UK Ltd.

  • 25626.
    Wästlund, Sven
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Hjelmberg, Tomas
    Halmstad University, School of Business and Engineering (SET).
    Testprogram för programmoduler1999Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]
    Our project has been developed in co-operation with Ericsson Software Technology in Karlskrona. Ericsson's testdepartment T/TT that we been working for main function is to test new written protocols. To test the protocols they need a program called SCS. SCS is written for UNIX and has been used for many years. Now Ericsson got an inquiry from their customers about making SCS work with Windows NT. Ericsson had year 1998 a thesis worker that researched in how to solve this problem. This prework lead to our thesis project that is about fulfilling the demands from the customers. The project includes porting as much of SCS as possible from UNIX to Windows NT and to write a portable graphical user interface for SCS. We choose to write the graphical user interface in Java since it should be plattformindependent. Compilers, UNIX shells and add-on libraries that we used for porting the applications were taken from Cygnus.
  • 25627.
    Wåhlin, Erik
    Halmstad University, School of Business and Engineering (SET).
    Innovation licensing1997Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]
    The study is focused on companies that licenses out some kind of manufactured technical product, which is patented. What patents and licensing is descibed, recognising the differant strategies fo licensing,as well as the pros and cons of licensing. This includes aspects such as that licensing is a good option when the resources to enter foreign markets with direct investments, e.g. joint ventures and subsidiaries. Licensing also presents a good return relative to invested resources, even though direct export usually provides higher total profit.
  • 25628.
    Wålander, Sara
    Halmstad University, School of Social and Health Sciences (HOS).
    Women taking up employment: - A sociological gender-study on Argentinean women's way towards emancipation2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study in sociology is the result of a MFS-project, sponsored by SIDA. The ideal in Argentina, at least for the upper classes, has for a long time been the man as bread-winner, the one who supports the family and the woman as the home-maker, the one who stays at home, taking care of house and children. Working-class women have always been working even though it has not been shown in the statistics. This feminist study in sociology is about what influence Argentinean women in their way towards emancipation but also about patriarchy as their biggest obstacle. The study is based on theories based on that in the world there is a world-order controlled by men. Another important theory is that it is easier for working women to reach emancipation in comparison with house-wives, because working women develop themselves in an economic as well as on a personal level. Additionally I went to the field in the Buenos-Aires area in Argentina during October until November 2000 where I did eleven interviews with Argentinean working mothers. I want to emphasize that as the interviews are eight years old, I have chosen not to integrate them very much through the essay, but instead showing them in a special chapter. I have, therefore, not given the interviews a central role in the essay. Instead, I emphasize the theories in the essay. The method I am using is qualitative method, with deep-interviews, the hermeneutic method and of course comparing theories from other authors. The conclusions I have come up with mean that the post-modern feminism is an important tool to understand the diversity of women and womens´ different conditions around the world. By realising these differences it would become easier to challenge the widespread patriarchy in Argentina. Argentinean women could reach emancipation by labour work and education that contribute to development on an economic and on a personal level. Even doing a voluntary work would contribute to this self-esteem and consciousness that are crucial for women on their way towards emancipation.

  • 25629.
    Wårdh, Inger
    et al.
    Dept of Gerodontology, Karolinska Institutet, Huddinge, Sweden.
    Paulsson, Gun
    Halmstad University, School of Social and Health Sciences (HOS), Centre of Research on Welfare, Health and Sport (CVHI).
    Fridlund, Bengt
    Department of Health Sciences and Statistical, School of Health Sciences and Social Work, Växjö University, Växjö, Sweden.
    Nursing staff's understanding of oral health care for patients with cancer diagnoses: an intervention study2009In: Journal of Clinical Nursing, ISSN 0962-1067, E-ISSN 1365-2702, Vol. 18, no 6, p. 799-806Article in journal (Refereed)
    Abstract [en]

    Aims and objectives. The aim of this study was to evaluate long-lasting changes in the nursing staff's understanding of oral health care for cancer patients after an oral health care intervention. The study also assessed whether there were changes between registered nurses and auxiliary nurses. Background. The maintenance of good oral health care in cancer patients is essential for nutrition, recovery and wellbeing and requires the involvement of nursing staff. However, several studies reveal that the need to prioritize oral health care has not been made sufficiently clear. Methods. The nursing staff (registered nurses, n = 133 and auxiliary nurses, n = 109) on five wards at different hospitals providing cancer care took part in a four-hour oral healthcare training session, including the use of an oral assessment guide and answered a questionnaire initially and after this intervention. The data were statistically analyzed. Results. Several aspects of implementation opportunities improved, but they did not include attitudes to oral health care. Knowledge of oral diseases decreased, more for auxiliary nurses than for registered nurses. Conclusions. A four-hour oral health training session and subsequent activities improve the nursing staff's understanding of oral health care for patients with cancer diagnoses in some respects but not in terms of attitudes to oral health care or specific oral knowledge. Relevance to clinical practice. Oral healthcare education and training activities for nursing staff can produce some improvements in the understanding of oral health care for cancer patients but not in attitudes and specific oral knowledge. These areas must be covered during the basic education period or/and by a routine oral healthcare programme for nursing staff, probably including an oral healthcare standard.

  • 25630.
    Wåxnäs, Pär
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Sandström, Anders
    Halmstad University, School of Business and Engineering (SET).
    Patsi 1.01991Student thesis
  • 25631.
    Wåxnäs, Pär
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Wickström, Nicholas
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Speech Enhancement using Artificial Neural Networks1995Independent thesis Advanced level (degree of Master (One Year))Student thesis
  • 25632.
    Wöhl, Sophie
    Halmstad University, School of Social and Health Sciences (HOS).
    Ambulanspersonals erfarenheter av gravt obesa patienter2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ambulanspersonal skall i sitt dagliga arbete lyfta och behandla patienter. I varje ambulans finns två ambulanssjukvårdare (kan även vara sjuksköterskor med eller utan specialistutbildningar) som har genomgått ett lyftprov som bekräftar att de på två man klarar att lyfta en patient som väger 90kg. Då en patient väger 150kg (gravt obes patient) eller mer blir det problematiskt, både ergonomiskt och medicintekniskt. Antalet överviktiga ökar, även de som räknas som gravt obesa. Syftet med denna uppsats vara att beskriva ambulanspersonalens erfarenheter då det gäller ambulanstransport av gravt obesa patienter.Enkäter besvarades anonymt av personal på en ambulansstation i södra Sverige. Svarsfrekvensen blev 29 av 55 personal efter att ett påminnelsebrev delats ut. Svaren bearbetades med beskrivande statistik. Resultatet visade att det inte fanns en fullt fungerande rutin för gravt obesa patienter. Personalen ansåg överlag att hjälpmedel inte var tillräckliga för att snabbt och säkert kunna transportera patienter med en vikt över 150kg till sjukhuset. Förbättring av rutiner samt hjälpmedel skulle kunde minska riskerna för skador hos personal samt innebära en bättre och säkrare vård vid transport till sjukhus.

  • 25633.
    Wörman, Johan
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Davidsson, Ted
    Halmstad University, School of Business and Engineering (SET).
    Examensarbete Variable filter solution2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    How to create a more effective filter for the dishwashers of tomorrow.

  • 25634.
    Xhemaili, Liridona
    et al.
    Halmstad University, School of Education, Humanities and Social Science.
    Mavraj, Floriana
    Halmstad University, School of Education, Humanities and Social Science.
    Läskunnighet är nyckeln som ska ge tillträdde till all annan kunskap: En kvalitativ studie om hur svensklärare undervisar i läsförståelse och lässtrategier.2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna studie undersöker vi utifrån ett lärarperspektiv läsförståelseundervisningen på två kommunala grundskolor, i södra Sverige. Studiens fokus ligger vid att undersöka om och hur lässtrategier tillämpas i undervisningen. Studien har även behandlat om fortbildningen Läslyftet har fått ett genomslag på skolorna och om Läslyftet har bidragit till någon skillnad när det gäller att modellera lässtrategier i undervisningen, bland de sju intervjuade grundskolelärarna. Efter de genomförda intervjuerna har studien visat att lärare implementerar lässtrategier i sin undervisning då samtliga betonar att läsförståelsen påverkar alla skolämnen och därmed har Läslyftet som en kompetensinsats bidragit till ett kollegialt lärande, där lärarna hävdar att de genom pedagogiska diskussioner med alla ämneslärare kunnat påverka varandra i att modellera lässtrategier i undervisningen. I studien framkom det således att eleverna behöver få systematisk och strukturerad undervisning i läsförståelsestrategier i tidig ålder, för att vidare på egen hand kunna ta sig an en text och bli medskapare av olika texter.

  • 25635.
    Xhemajli, Belkize
    et al.
    Halmstad University, School of Social and Health Sciences (HOS).
    Svensson, Anette
    Halmstad University, School of Social and Health Sciences (HOS).
    Att arbeta i hemtjänsten2008Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Syftet med denna uppsats är att utifrån ett sociologiskt perspektiv försöka betona arbetssituationen i hemtjänsten. Vi har gjort en kvalitativ studie och vårt empiriska material är intervjuer med områdeschefer och undersköterskor. Resultatet visar att arbetsmiljön i hemtjänsten är stressig och att yrket anses ha låg status. Det framkommer att en del sjukskrivningar beror på tung arbetsbörda men det kan oxå bero på ens livssituation. Projektet Möjligheternas Hemvård kommer redovisas i uppsatsen och är ett förändringsarbete som kommer genomföras i hemtjänsten. Resultatet har redovisats i teman som som är gemensamma svar utifrån informanterna. Dessa teman är arbetsmiljön, yrkets status, sjukskrivningar, Möjlighternas Hemvård och män i hemtjänsten. I vårt arbete ska ni nu ska läsa har vi försökt att problematisera någar av de faktorer som berör arbetssituationen inom hemtjänsten.

  • 25636.
    Xia, Feng
    et al.
    Dalian University of Technology.
    Vinel, Alexey
    Department of Communications Engineering, Tampere University of Technology.
    Gao, Ruixia
    Dalian University of Technology.
    Wang, Linqiang
    Dalian University of Technology.
    Qiu, Tie
    Dalian University of Technology.
    Evaluating IEEE 802.15.4 for Cyber-Physical Systems2011In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, no Article number 596397Article in journal (Refereed)
    Abstract [en]

    With rapid advancements in sensing, networking, and computing technologies, recent years have witnessed the emergence of cyber-physical systems (CPS) in a broad range of application domains. CPS is a new class of engineered systems that features the integration of computation, communications, and control. In contrast to general-purpose computing systems, many cyber-physical applications are safety critical. These applications impose considerable requirements on quality of service (QoS) of the employed networking infrastruture. Since IEEE 802.15.4 has been widely considered as a suitable protocol for CPS over wireless sensor and actuator networks, it is of vital importance to evaluate its performance extensively. Serving for this purpose, this paper will analyze the performance of IEEE 802.15.4 standard operating in different modes respectively. Extensive simulations have been conducted to examine how network QoS will be impacted by some critical parameters. The results are presented and analyzed, which provide some useful insights for network parameter configuration and optimization for CPS design. © 2011 Feng Xia et al.

  • 25637.
    Xia, Feng
    et al.
    School of Software, Dalian University of Technology, China.
    Yang, Laurence T.
    Department of Computer Science, St. Francis Xavier University, Canada.
    Wang, Lizhe
    Indiana University, USA.
    Vinel, Alexey
    Department of Communications Engineering, Tampere University of Technology, Finland.
    Internet of Things2012In: International Journal of Communication Systems, ISSN 1074-5351, E-ISSN 1099-1131, Vol. 25, no 9, p. 1101-1102Article in journal (Refereed)
  • 25638.
    Xiang, Gao
    et al.
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligent systems (IS-lab).
    Nan, Jiang
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS), Intelligent systems (IS-lab).
    Supervised Methods for Fault Detection in Vehicle2010Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Uptime and maintenance planning are important issues for vehicle operators (e.g.operators of bus fleets). Unplanned downtime can cause a bus operator to be fined if the vehicle is not on time. Supervised classification methods for detecting faults in vehicles are compared in this thesis. Data has been collected by a vehicle manufacturer including three kinds of faulty states in vehicles (i.e. charge air cooler leakage, radiator and air filter clogging). The problem consists of differentiating between the normal data and the three different categories of faulty data. Evaluated methods include linear model, neural networks model, 1-nearest neighbor and random forest model. For every kind of model, a variable selection method should be used. In our thesis we try to find the best model for this problem, and also select the most important input signals. After we compare these four models, we found that the best accuracy (96.9% correct classifications) was achieved with the random forest model.

  • 25639.
    Xiang, Junren
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Scalable AWG (arry waveguide grating)- based Network for Real-Time Communication2006Independent thesis Advanced level (degree of Master (One Year))Student thesis
  • 25640.
    Xiang, Yang
    et al.
    Deakin University, Burwood VIC, Australia.
    Taha, Walid
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
    Wang, Hua
    University of Southern Queensland, Toowoomba QL, Australia.
    EUC 2011: Message from the program committee chairs2011In: Proceedings - 2011 IFIP 9th International Conference on Embedded and Ubiquitous Computing, EUC 2011, p. xiii-xiiiArticle in journal (Refereed)
    Abstract [en]

    Presents the welcome message from the conference proceedings.

  • 25641.
    Xiao, L.
    et al.
    Chalmers University of Techonology, Göteborg.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Nilsson, P. H.
    Volvo Technology Corporation.
    Kalin, M.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Vižintin, J.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Rolling and rolling-to-sliding contact behaviour of DLC coatings2005In: Life cycle tribology: proceeding of the 31st Leeds-Lyon symposium on tribology held at Trinity and All Saints College, Horsforth, Leeds, UK, 7th-10th September 2004 / [ed] Dowson, D., Amsterdam: Elsevier, 2005, p. 213-220Conference paper (Refereed)
  • 25642.
    Xiao, Li
    Chalmers University of Technology, Göteborg, Sweden.
    Effect of rough surface anisotropy on friction in gears2002Licentiate thesis, comprehensive summary (Other academic)
  • 25643.
    Xiao, Li
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Gear tribology: friction and surface topography2005Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. To increase efficiency and reduce damage accumulation in gears has always been a background motivation to this thesis. It focuses on the frictional performance of manufactured gear surfaces with emphasis on the effect of surface topography and the orientation of its lay.

    To achieve the goal of this work, a test rig was designed and constructed. The rig makes it possible to examine gear tooth friction on double crowned rollers. Five alternative gear-finishing processes are implemented in roller surface preparation. They comprise grinding, shotpeening, phosphating, chemical deburring and DLC coating. Theoretically, a friction model is suggested which helps to explain some of the testing results. Advanced surface metrology techniques and statistical tools are implemented in identifying surface features that influence friction.

    The result demonstrates that surface topography is a significant factor affecting the lubricated frictional behaviour. For ground-finishing, the smoother the surfaces are finished, the lower friction coefficient they show. Chemical deburring and DLC coating as well as certain degrees of phosphating provide minimum friction coefficient and improved load carrying capacity, which are competitive to fine-ground finishing. Properly designed lay combinations of meshing gear surfaces can minimise friction and improve gear transmission efficiency. Theoretically, the friction coefficient can be explained by means of a combination of the slide-to-roll ratio and the real mean contact pressure within the range of loads considered in this thesis. Finally, features that correlate surface topography to friction are identified.

  • 25644.
    Xiao, Li
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    An Experimental Study on the Effect of Surface Topography on Rough Friction in Gears2001In: Proceedings of the JSME International Conference on Motion and Power Transmissions: MPT2001-Fukuoka; November 15 - 17, 2001, Fukuoka, The Japan Society of Mechanical Engineers , 2001, Vol. 2, p. 547-552Conference paper (Other academic)
  • 25645.
    Xiao, Li
    et al.
    Chalmers University of Technology, Production Engineering, Göteborg, Sweden.
    Björklund, Stefan
    KTH, Machine Design, Stockholm Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The influence of surface roughness and the contact pressure distribution on friction in rolling/sliding contacts2007In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, no 4, p. 694-698Article in journal (Refereed)
    Abstract [en]

    A numerical contact model is used to study the influence of surface roughness and the pressure distribution on the frictional behaviour in rolling/sliding contacts. Double-crowned roller surfaces are measured and used as input for the contact analysis. The contact pressure distribution is calculated for dry static contacts and the results are compared with friction measurements in a lubricated rolling/sliding contact made with a rough friction test rig. The mean pressure is suggested as a parameter that can be used to predict the influence of surface roughness on the friction coefficient in such contacts. The results show two important properties of the friction coefficient for the friction regime studied in this paper: (1) there is a linear decrease in friction coefficient as a function of the slide-to-roll ratio, and (2) the friction coefficient increases linearly with increasing mean contact pressure up to a maximum limit above which the friction coefficient is constant. The absolute deviation of experimental results from the derived theory is for most cases within 0.005.

  • 25646.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Surface lay effect on rough friction in roller contact2004In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1301-1307Article in journal (Refereed)
    Abstract [en]

    Surface lay describes the direction of the predominant surface pattern. A properly designed surface texture configuration has been recognised as a vital issue affecting lubrication and sliding in machinery applications in the literature. Gaining understanding of this tribological phenomenon is no doubt beneficial in facilitating the production of more efficient machine parts and thus reduces production cost. This paper describes an experimental method to investigate the effect of surface lay on lubricated rolling/sliding of ground roller surfaces. By using the rough friction test rig, different surface lay contacts can be simulated and the friction can be measured. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter [ηv/p]). Results show that an optimal contact lay angle that provides a minimum friction value is achievable through rig testing. The relative sliding speed direction has a symmetrical effect on friction at the same lay orientation; for sliding speed angles less than about 80, the larger the angle, the lower the friction, and vice versa. © 2004 Elsevier B.V. All rights reserved.

  • 25647.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Nilsson, Per H.
    Volvo Technological Development, Gothenburg, Sweden.
    A study on the effect of surface topography on rough friction in roller contact2003In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 254, no 11, p. 1162-1169Article in journal (Refereed)
    Abstract [en]

    The friction behaviour of gear teeth in the context of tribology can have a strong effect on housing vibration, noise and efficiency. One of the parameters that greatly influences the friction under certain running conditions is surface roughness. In this work, rough friction was studied in lubricated sliding of roller surfaces, which were manufactured to simulate the real gear surfaces. By examining 3D surface topography of two mating bodies, both surface roughness and its effect on friction behaviour can be studied. In a previous study, a rough-friction test rig has been designed, constructed and initially verified. The types of surfaces involved in this study are ground, shot-peened, phosphated and electrochemically deburred. These rollers were subjected to the same friction testing procedures. Roller surfaces were then examined, and correlation between the topography and the frictional behaviour was analysed. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter (ην/p)). The results showed that electrochemically deburred and certain phosphated surfaces provide lower friction coefficient values which are competitive to fine-ground surfaces in lubricated rolling/sliding contact. © 2003 Elsevier Science B.V. All rights reserved.

  • 25648.
    Xie, Hong
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    A Protocol Stack in TinyTimber for PIEs that Cooperate for Traffic Safety2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    There is an increasing demand for reliable wireless communication in embedded real time systems.  Various communication requirements make the development and deployment of applications that rely on the existence of a protocol stack a challenging research and industrial field of activity. Suitable protocol stacks need to be designed and implemented on new hardware platforms and software structures. Applications that exchange packets over a wireless medium have to deal with time constraints, error checks and have to be aware of energy consumption.

     

    PIE (Platform for Intelligent Embedded Systems) is an experimental platform developed at Halmstad University for educational purposes.  It is a robotic vehicle with wireless communication capabilities that can be used to experiment with traffic scenarios where the vehicles communicate in order to cooperate, for example to avoid hazards or to build platoons.

     

    This thesis addresses the design and implementation of a protocol stack suitable for the PIE platform in the area of vehicle alert systems. Requirements include low latencies along with low packet loss ratios.  The thesis addresses also experimenting with reactive objects for programming network software. 

  • 25649.
    Xing, Tinglu
    Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE).
    Design and implementation of a web-based battle application for the New Horizon RPG2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With the popularity of online role-playing games, a web-based battle application is designed to help the players to improve their characters for the combat. The developed prototype concentrates on one-player-multi-characters mode. The project consists of three major objectives. The first one focuses on the development of web-based interfaces for user registration and login. This functionality benefits the user with an individual and personalized member account. The second goal is to improve the existing web-application for character creation so the user data input is stored in a database for posterior retrieval. The third objective refers to the development of a web-based battle application that allows players to test created characters in a battle, one character against another one. This project also contributed with a logical database model that overcomes some design issues, such as normalization problems, in the current database model.

  • 25650.
    xinjing, chen
    et al.
    Halmstad University, School of Business and Engineering (SET).
    simin, pan
    Halmstad University, School of Business and Engineering (SET).
    The influences of national culture on new product development collaboration2011Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    To  ensure  success  in  the  rapid  pace  of  globalization,  it  is  crucial  for  companies  to understand the management practice within and outside national boundaries. This study investigates  the  influences  of  national  culture  on  new  product  development  (NPD) collaboration between China and Sweden.  

    By applying  the  qualitative approach  with a single  case,  the  study  shows that national culture influences on NPD  collaboration  by  means  of organizational  culture and  work values   regarding   six   national   culture   dimensions   between   China   and   Sweden. Concerning  organizational  culture,  power  distance  and  masculinity  versus  femininity dimensions  of  national  culture  have  impacts  on  NPD  collaboration.  In  terms  of  work values, the  influences  of power  distance and uncertainty avoidance are  ranked at  first place, whereas individualism and collectivism, masculinity  versus femininity, harmony and long-term versus short-term orientation are relative weak comparing with first two dimensions.  

    However,  the  results  also  show  that  some  organizational  characteristics  including uncertainty  avoidance,  long-term  versus  short-term  orientation  and  harmony  have barely  effects on NPD  collaboration. This  implies that there  could  be  context-specific factors  that  affect  performances  of  NDP  collaboration  regardless  of  in  which  country the NPD project takes place.

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  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf