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  • 1351.
    Urenda Moris, Matias
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Svensson, Jacob
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Simplification and aggregation strategies applied for factory analysis in conceptual phase using simulation2008In: Proceedings of the 2008 Winter Simulation Conference, IEEE conference proceedings, 2008, p. 1913-1921Conference paper (Refereed)
  • 1352.
    Urenda Moris, Matías
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Dealing with variability in the design, planning and evaluation of Healthcare inpatient units: a modelling methodology for patient dependency variations2010Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This research addresses the fluctuating demand and high variability in healthcare systems. These system’s variations need to be considered whilst at the same time making efficient use of the systems’ resources. Patient dependency fluctuation, which makes determining the level of adequate staffing highly complex, is among the variations addressed. Dealing with variability is found to be a key feature in the design, planning and evaluation of healthcare systems.

    Healthcare providers are facing increasing challenges resulting from an aging population, higher patient expectancies, a shortage of healthcare professionals, as well as increasing costs and reduced funding. Despite the accentuated need for effective healthcare systems and efficient use of resources, many healthcare organisations are inadequately designed and, moreover, poorly managed. Hospital systems consist of complex interrelations between relatively small units, each of which is sensitive to stochastic variations in demand. In addition to this aspect of the system view, a critical resource for the patients’ wellbeing and survival is the staffing level of nurses. This puts the planning and scheduling of human resources as one of the system’s foremost aims. Current tools for staffing and personnel planning in healthcare organisations do not take into consideration the workload variations that result from the variable nature of patient dependency levels.

    The work presents the empirical findings of a number of case studies conducted at a regional hospital in Sweden. Principles and practical suggestions for the robust system design of inpatient wards using Discrete Event Simulation (DES) have been identified. Although DES techniques have, in principle, all the features for modelling the variation and stochastic nature of systems, DES has not been previously used for workload studies of inpatient wards. The main contribution of this work is therefore how a combination of DES and the data of Patient Classification Systems (PCSs) can be used to model workload variations and, subsequently, plan the nurse staffing requirements in systems with high variability. The work presented gives step by step guidance in how the analysis and subsequent modelling of an inpatient ward should be carried out. It defines a novel modelling methodology for patient dependency variations and length of stay modelling of a patient’s dependency progression, including an adaptation to the ward’s discharge figures. The modelling approach opens a novel way of analysing and evaluating the system design of inpatient wards.

  • 1353.
    Urenda Moris, Matías
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Bernedixen, Jacob
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Goienetxea, Ainhoa
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Diseño Y Análisis De Sistemas Productivos Utilizando La Optimización Mediante Simulación Basado En Internet2012In: Ingenieria Industrial, ISSN 0717-9103, E-ISSN 0718-8307, Vol. 11, no 1, p. 37-49Article in journal (Other academic)
  • 1354.
    Urenda Moris, Matías
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Bernedixen, Jacob
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Goienetxea Uriarte, Ainhoa
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Diseño Y Análisis De Sistemas Productivos Utilizando La Optimización Mediante Simulación Basado En Internet2011Conference paper (Refereed)
  • 1355.
    Valerio Trujillo, Francisco Javier
    et al.
    University of Skövde, School of Technology and Society.
    Gallego Díaz, José Antonio
    University of Skövde, School of Technology and Society.
    DEVELOPMENT OF FURNITURE FOR SKÖVDE CULTURAL CENTRE2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Skövde Kulturhus is a cultural centre in Skövde that have been remodelled to incorporate new areas

    and to improve the old ones. The centre has different locals where different activities can be

    performed such as watching movies and theatre plays, dance, etc. In the art gallery, one of the new

    areas is the workshop, and for this, new furniture is needed. During the project, a set of a table and

    chairs have been developed for the workshop, following some specifications, set by the personnel of

    the Cultural Centre and by the conclusion from the different investigations.

    This report covers the whole process from the different researches to the evaluation and the

    development of the final concepts; it follows a modification of the Cyclic Strategy Method process,

    which includes the research and different design tools to create the concepts, as morphological chart,

    braindrawing and a study of the form. User studies have been made to get a good understanding of the

    way a person uses this furniture using surveys; ergonomics research has been made to design

    furniture for all kind of people; and market research have been made to discovered what kind of

    furniture is usually used. All these researches have been investigated to create the optimal table and

    chair for the activities done at the Centre. The final solutions, which have been evaluated against

    other concepts, are a wooden table, whose design and modular form permits to join other tables to

    work in teams; and a wooden chair, which have been designed for different people size. Both would

    fulfil the requirements and fit in the new cultural centre.

  • 1356.
    van Laere, Joeri
    et al.
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    Nilsson, Maria
    University of Skövde, School of Humanities and Informatics. University of Skövde, The Informatics Research Centre.
    Ujvari, Sandor
    University of Skövde, School of Technology and Society.
    Hilletofth, Per
    University of Skövde, School of Technology and Society.
    Reflections on fusion systems requirements analysis for maintenance planning2008In: Proceedings of the 2nd Skövde Workshop on Information Fusion Topics (SWIFT 2008) / [ed] H. Boström, R. Johansson, Joeri van Laere, Skövde: University of Skövde , 2008, p. 5-8Conference paper (Other academic)
  • 1357.
    Varas, Isabel
    et al.
    University of Skövde, School of Technology and Society.
    Puumala, Tatiana
    University of Skövde, School of Technology and Society.
    Eko-kläder är ingen övergående fluga: hur marknadsförs utbudet av ekologiska kläder i olika butiker och vilka marknadsföringskanaler som inte används idag skulle kunna användas av dessa butiker?2008Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Eko-trenden är ett aktuellt ämne i dagens samhälle. De senaste åren har informationen om vår omvärld och de negativa konsekvenserna på miljön blivit ett argument för att alla måste börja ta ansvar. I Sverige köper vi mer kläder än någonsin och de kemikalier som används vid tillverkningen är skadliga för miljön och för dem människor som arbetar med tillverkning av kläder. Det senaste året har många butiker börjat intressera sig för ett miljöarbete och de har därför börjat introducera ekologiska framställda kläder bland sina vanliga kollektioner.

    Undersökningen i den här uppsatsen bygger på hur olika butiker ställer sig till den ekologiska företeelsen med fokusering på hur de marknadsför deras ekologiska produkter. Syftet med uppsatsen är att beskriva vad butikerna gör för att marknadsföra sig så att konsumenterna uppmärksammar deras nya eko-kläder. Vilka kanaler de använder, i vilken utsträckning de används och vilka marknadsföringskanaler de skulle kunna använda sig av är de problemen som ligger till grund för undersökningen. För att skaffa oss kunskap om detta har vi intervjuat butiksrepresentanter samt gjort fallstudier i de berörda butikerna. Vi har även granskad olika marknadsföringskanaler som används och som inte används av butikerna. Metoden har gett oss en tydlig inblick i ämnet för att kunna dra ändamålsenliga slutsatser.

    Vi kan konstatera att butikerna som tar in ekologiska kollektioner blir fler och fler och att det inte är en övergående fluga utan är här för att stanna. Många människor vill värna om miljön och efterfrågar ekologiska produkter mer och mer. Därför är det nödvändigt för butikerna att göra sina nya eko-produkter synliga för den målgrupp som eftersträvar dessa produkter.

    Vår studie visar att många butiker brister i att göra kunden uppmärksam på vad de har att erbjuda, speciellt gällande deras ekologiska produkter. Undersökningens slutsatser landar därför i att butikerna behöver arbeta mer med sin marknadsföring av dessa produkter och inse att kundsegmentet som i nuläget anses som smalt med stor sannolikhet kommer att breddas.

  • 1358.
    Vermunt, Riël
    University of Skövde, School of Technology and Society. Universiteit Leiden, Nederländerna.
    Stresshantering med hjälp av bättre kommunikation2005In: Perspektiv på Högskolan i Skövde, ISSN 1653-8242, Vol. 2, no 1, p. 24-25Article in journal (Other (popular science, discussion, etc.))
  • 1359.
    Vermunt, Riël
    et al.
    Department of Psychology, University of Leiden, Wassenaarseweg, Netherlands.
    Kazemi, Ali
    University of Skövde, School of Technology and Society.
    Törnblom, Kjell
    University of Skövde, School of Technology and Society.
    The Salience of Outcome and Procedure in Giving and Receiving Universalistic and Particularistic Resources2012In: Handbook of social resource theory: theoretical extensions, empirical insights, and social applications / [ed] Kjell Törnblom, Ali Kazemi, New York: Springer, 2012, p. 397-405Chapter in book (Refereed)
    Abstract [en]

    As Riël Vermunt, Ali Kazemi, and Kjell Törnblom point out in this chapter, resource allocations may be judged on the basis of the resulting final outcome and/or the procedures applied to arrive at the outcome. The focus of this chapter is on how attention to the outcome or procedure is affected by the nature of the allocated resource (universalistic versus particularistic) and the direction of allocation (when P is a provider versus a recipient). Results from a cross-national survey study involving respondents from Austria, Italy, the Netherlands, Sweden, and the USA showed that procedure was perceived as more focal in the allocation of universalistic as compared to particularistic resources. No differences were observed with regard to the salience of outcome. Interestingly, this held only true for resource providers; for resource recipients, this pattern was reversed. These and other findings suggest that the meaning of resource classes (in this study money and love) differ for providers and recipients in their judgments of allocation events. The authors conclude by discussing the implications of these findings for SRT and for future research.

  • 1360.
    Vermunt, Riël
    et al.
    University of Skövde, School of Technology and Society.
    Peeters, Yvette
    Leiden University, Netherlands.
    Berggren, Karl
    Capio Diagnostik AB, Sweden.
    How fair treatment affects saliva cortisol release in stressed low and high type-A behavior individuals2007In: Scandinavian Journal of Psychology, ISSN 0036-5564, E-ISSN 1467-9450, Vol. 48, no 6, p. 547-555Article in journal (Refereed)
    Abstract [en]

    The effects of fair treatment on saliva cortisol release of low and high Type-A behavior participants in high or low stress conditions are studied. Based on the Injustice Stress Theory (Vermunt & Steensma, 2001), predictions were made about fair treatment as a stress reducing factor. The results support the expected effect of fair treatment in that high type-A behavior participants in the low stress conditions had lower saliva cortisol levels after fair treatment while this effect was absent in the neutral condition, while low type-A behavior participants showed lower saliva cortisol release in the high stress conditions after fair treatment while this effect was absent in the neutral condition. Moreover, saliva cortisol scores are correlated positively with negative affect scores and negatively with positive affect scores. The discussion focuses on theoretical implications and suggestions for future research.

  • 1361.
    Vermunt, Riël
    et al.
    University of Skövde, School of Technology and Society.
    Peeters, Yvette
    Berggren, Karl
    Stress, Voice, and Cortisol Release2004In: Proceedings of the 4th Nordic Conference on Group and Social Psychology 27-28 May 2004 / [ed] Ingvar Karlsson, Kjell Törnblom, Riël Vermunt, Skövde: University of Skövde , 2004, p. 53-68Conference paper (Other academic)
  • 1362.
    Vessela, Misheva
    University of Skövde, School of Technology and Society.
    Samhället och sociologin i Niklas Luhmanns systemteori2011In: Sociologik: Tio essäer om socialitet och tänkande / [ed] Christian Abrahamsson, Fredrik Palm & Sverre Wide, Stockholm: Santérus Academic Press Sweden, 2011, p. 177-215Chapter in book (Refereed)
  • 1363.
    Vestin, Jenny-Ann
    et al.
    University of Skövde, School of Technology and Society.
    Bredenfeldt, Anna
    University of Skövde, School of Technology and Society.
    Relationen mellan "identitetskärnan" och postmoderniteten: En kvalitativ undersökning om relationer, identitet och postmodernism2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vi har valt att genomföra denna studie då vi anser att det är ett ämne som är relevant då det inte finns så mycket tidigare forskning om sambandet mellan identitet, relationer och det postmoderna samhället. Problemformulering i denna studie är: Hur upplever 19–20-åriga ungdomar, av båda könen, identitetsskapande och relationer i det postmoderna samhället? Studien genomfördes i form av semistrukturerade intervjuer och på så sätt försökte vi förstå hur ungdomarna hanterar den komplexitet som ligger bakom de postmoderna identite-terna och deras skapelseprocess. Intervjuerna sattes i förhållande till teorier av exempelvis Mead (1977), Bauman (2002, 2003) och Giddens (1997). Tidigare forskning visar att postmodernitetens identitet är ett uppmärksammat ämne ex-empelvis genom Hjalmarson Vertovecs (2009) studie kring just postmodernitetens identitet. Dock läggs fokus, i denna studie, på relationernas betydelse för identitetsskapande i det post-moderna samhället. På så sätt kompletteras bilden av postmoderna identiteter. Målgruppen i denna studie är varierad, uppsatsen kan läsas av socialpsykologer då den är skriven ur ett socialpsykologiskt perspektiv. Men den kan också läsas av någon som är in-tresserad av något av våra huvudbegrepp; identitet, postmodernitet och relationer. I och med vald metod, semistrukturerade intervjuer, är det lämpligt att ett bekvämlig-hetsurval används. Respondentantalet var 6 stycken. De innehållsrika intervjuerna bidrog till att en grundlig analys kunde genomföras och därmed fann vi reliabla förklaringar till studiens frågeställningar. De resultat vi funnit visar att identitet, relationer och samhälle är tre ämnen som är mer sammanknutna än vi först trodde från början. Respondenterna hade ibland svårt att skilja de olika teman vi valt åt, då de är så ihopkopplade i dagens samhälle. Resultaten visar att identi-teten idag sammankopplas väldigt lätt med roller och att relationer är en stor påverkansfaktor i identitetsskapandet. Slutsatser vi dragit utifrån denna studie är bland annat att detta ämne är relevant och att det behövs göras fortsatta, djupare studier inom det.

  • 1364.
    Vigstrand Stenberg, Pernilla
    et al.
    University of Skövde, School of Technology and Society.
    Lagset, Sofie
    University of Skövde, School of Technology and Society.
    Personalens säljteknik inom detaljhandeln: Hur kunder uppfattar servicen2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The consumption of shoes and clothes has increased with 50 % between the years 2000 and 2010. This makes the shoe industry especially interesting to look closer to in particular because of the bad service in shoe stores in the country according to DNs investigation. The problem of the essay is building on: how do sellers influence consumer’s satisfaction in shoes stores? What do different types of consumers want in sellers?

     

    To build understanding for this problem this essay is presenting relevant theories about selling techniques, adapting selling and different types of consumers. This describes the importance of adapt selling after the consumer special needs and different types of consumer and how to adapt selling to these different types. The selected selection with 90 respondents will make a quantitative method and to make the study’s results with a lot of credibility and reliability.

    The respondents divided in three different shoe stores, 30 in each store. The study was to clarify how the respondents experienced the stores service and which types the costumers belong to and also which type of seller they preferred. The result of the study showed that the roll of the seller in shoe stores have big influence and that most of the costumers requesting a seller that is available. It can be hard to fully discern different types of costumers and what kind of seller they want then each costumer is unique and special, but it is possible to see a pattern and interconnections according to the theory and the study has also given the essay new approaches on certain parts. As certain types of costumer do not prefer the kind of seller that the theory indicates, and the different types of costumers want the products to be presented in different ways.

  • 1365.
    Vikström, Jenny
    et al.
    University of Skövde, School of Technology and Society.
    Eriksson, Alexandra
    University of Skövde, School of Technology and Society.
    ATT TRIGGA KONSUMENTERTILL KÖP: Genom olika säljfrämjande åtgärder2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are many trading companies today, which bring fierce competition over the customers. Stores use a lot of different kinds of marketing to reach respective target groups, marketing is a very wide term and involves many different measures that the stores can use. Our study focuses on three different kinds of sales promotion who are relative common today. We have studied whether the coupon offers, SMS offers and offer ‘buy one get one for free’ affects different consumer behavior and if consumers become more inclined to buy when they are exposed to them. The offer ‘buy one get one for free’ can be used in several similar ways, but the authors have only seen the offer as a communication channel in the retail environment, such as signage and packaging. The research question that will illuminate the entire work is how consumer behavior is influenced by the discount offers? The things that are investigated are if coupons, text message offers and ‘buy one get one for free’ have an effect on consumers behavior and if they become more liable to purchase when they are exposed of these promotions. In our study we will express the highlights of the differences and similarities that emerged between different generations and through a gender perspective. We have also checked the possible risks respective opportunities that may be found using these three different kinds of saving offers. The authors have chosen to implement a quantitative approach and the inspiration for our survey is based on previous research. The survey has been conducted on 100 respondents questioned by e-mail and randomly selected in Katrineholm city. The participants surveyed are divided into four categories according to age and gender.The survey gave the authors evidence to demonstrate that consumers react differently depending on the type of promotion they were subjected. The authors can see a clear difference between these types of offers. 'Buy one get one for free' which refers to a communication channel in the retail environment was the offer that all participants preferred. The category with older men was the participants who generally did not prefer different types of discount offers.

  • 1366.
    Vikström, Jenny
    et al.
    University of Skövde, School of Technology and Society.
    Manfredsson, Evelina
    University of Skövde, School of Technology and Society.
    Du ska inte bita den hand som föder dig: En studie på effekterna av religion och etiska värderingars inverkan på internationell marknadsföring i Saudiarabien2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Keywords: The impact of culture, ethics and religion, consumer behavior, International marketing and swedishness

    Purpose

    The purpose of this study is to create a deeper understanding about cultural factors, such as religion and ethical value, and the impact on Swedish business international marketing designs with focus on the Saudi Arabian market. With this knowledge the purpose of this study continues to focus on which effects this may have on the Swedish market and if the effects differ between different generations, gender and low-income respective high-income earners.

    Problem

    How do cultural factors, such as religion and ethical values, have an impact on Swedish business international marketing design in Saudi Arabia?

    Which impacts have the adaptations on the Swedish market and are there any differences between different groups of consumers, such as generations, gender and low-income respective high-income earners?

    Method

    This study focus on two big Swedish retail companies that operates on the Saudi Arabian market. The investigations in this study are built on both qualitative and quantitative data, one literature study and one survey that included 171 participants.

    Results and conclusions

    Cultural factors have a large impact on the businesses international marketing designs, but they have chosen different way to handle the situations. The Swedish consumers reactions were different regarding on the adaptations and it’s really important that the business know which adaptations that they are accepting and not. Customers may change from one brand to another because of ethical values and the companies need to have a long-term sustainable marketing.

  • 1367.
    Viotto, Nathalie
    et al.
    University of Skövde, School of Technology and Society.
    Haglund, Denice
    University of Skövde, School of Technology and Society.
    Valet mellan K2 och K3: Hur skapar redovisare mening i valet mellan regelverken K2 och K3 med utgångspunkt i företagens intressenter?2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 1368.
    Voytovych, R.
    et al.
    LTPCM, ENSEEG, Inst. Natl. Polytech. de Grenoble, D.U. BP 75, F-38402, St-Martin-d'Heres Cedex, France.
    Ljungberg, Lennart Y.
    University of Skövde, School of Technology and Society.
    Eustathopoluos, Nikos
    LTPCM, ENSEEG, Inst. Natl. Polytech. de Grenoble, D.U. BP 75, F-38402, St-Martin-d'Heres Cedex, France .
    The role of adsorption and reaction in wetting in the CuAg–Ti/alumina system2004In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 51, no 5, p. 431-435Article in journal (Refereed)
    Abstract [en]

    The additions of previous termTi to CuAgnext term eutectic is known to strongly promote previous termwetting on alumina.next term However, it is still not clear whether this improvement is due to newly formed previous termreactionnext term products or to previous termadsorption.next term The aim of this study is to clarify the previous termrolenext term of interfacial previous termreactions on wettingnext term using new data generated by sessile drop experiments.

  • 1369.
    Vujicic, Sanja
    et al.
    Univ Gothenburg, Ctr Tourism, Sch Business Econ & Law, Gothenburg, Sweden .
    Wickelgren, Mikael
    University of Skövde, School of Technology and Society.
    Destination Branding in Relation to Airports: The Case of the City of Valencia2011In: European Journal of Transport and Infrastructure Research, ISSN 1567-7133, E-ISSN 1567-7141, Vol. 11, no 3, p. 334-345Article in journal (Refereed)
    Abstract [en]

    This study investigates various factors that contribute to the success of destination branding efforts where success is defined as the increase in airplane passenger numbers to a destination and its linked air transportation. Drawing on in-depth interviews and snowball sampling, the study examines the roles of many of the key actors involved in the efforts to increase passenger numbers. Using the City of Valencia in Spain as a case study, the role of its airport is examined as a factor of particular interest. The study concludes that Valencia has positioned itself among neighbouring destinations on the Spanish Mediterranean coast by its focus on high profile events and cultural tourism. However, other actors have taken a more active role in the effort to increase the number of tourists than the Valencia Airport that has taken a more passive role. Another finding is that the persistence in seeking resources for the costly branding efforts was another influential factor that explains the increase in Valencia tourism.

  • 1370.
    Walander, Tomas
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Cohesive modelling of the temperature dependence of epoxy based adhesives in Mode I and Mode II loading2013Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this work, the influence of the temperature on the cohesive laws for two epoxy adhesives is studied at temperatures below the glass transition temperature for both Mode I and Mode II loading. Cohesive laws are measured experimentally under quasi-static loading conditions in the temperature range -30≤T≤80"C" . Three parameters of the cohesive laws are studied in detail: the elastic stiffness, the peak stress and the fracture energy. Methods for determining the elastic stiffness in Mode I and Mode II are derived and evaluated. With these methods, the results in this work show that it is possible to measure all three parameters for each pure mode loading case by the use of only the DCB- and the ENF-test specimens. Even though the measures tend to spread in values, this can significantly reduce the cost for performing experiments. It is shown that most of the cohesive parameters are decreasing with an increasing temperature in both loading modes and for both adhesives. An exception is the Mode I fracture energy for one of the adhesives. This is shown to be independent of the temperature in the studied temperature range. For the same adhesive, the Mode II fracture energy is shown to be continuously decreasing with an increasing temperature. The experimental results are verified by finite element analyses. The simulations only consider uncoupled cohesive behaviours. By use of the experimental results, simplified bi-linear cohesive laws to be used at any temperature within the studied temperature range are derived for one adhesive in both loading modes. This is desired in order to simulate adhesively bonded structures that suffer a wide range in temperature.

  • 1371.
    Walander, Tomas
    University of Skövde, School of Technology and Society.
    System for measurement of cohesive laws2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis an experimental method to calculate cohesive characteristics for an adhesive layer in a End Notched Flexure (ENF) specimen is presented and evaluated. The method is based on the path independent J-integral where the energy release rate (ERR) for the adhesive is derived as a function of the applied forces and the rotational displacements at the loading point and at the supports of the specimen. The major advantage with the method in comparison with existing theory known by the job initiator is that it is still applicable with ENF specimens that are subjected to yielding of the adherends.

    The structure of this thesis is disposed so that the theory behind the J-integral method is shortly described and then an evaluation of the method is performed by aid of finite element simulations using beam and cohesive elements. The finite element simulations indicates that the ERR can be determined with good accuracy for an ENF specimen where a small scale yielding of the adherends has occurred. However when a fully cross sectional yielding of the adherends is reached the ERR starts diverging from the exact value and generates a too high ERR according to input data in the simulations, i.e. the exact values. The importance in length of the adhesive process zone is also shown to be irrelevant to the ERR measured according to the J-integral method.

    Simulation performed with continuum elements indicates that a more reality based FE- simulation implies a higher value of the applied load in order to create crack propagation. This is an effect of that the specimen is allowed to roll on the supports which makes the effective length between the supports shorter than the initial value when the specimen is deformed. This results in a stiffer specimen and thus a higher applied force is needed to create crack propagation in the adhesive layer.

    An experimental set up of an ENF specimen is created and the sample data from the experiments are evaluated with the J-integral method. For measuring the rotational displacements of the specimen which are needed for the J-integral equation an image system is developed by the author and validated by use of linear elastic beam theory. The system calculates the three rotational displacements of the specimen by aid of images taken by a high resolution SLR camera and the system for measuring the rotations may also be used in other applications than for a specific ENF geometry. The validation of the image system shows that the rotations calculated by the image system diverge from beam theory with less than 2.2 % which is a quite good accuracy in comparison with the accuracies for the rest of the used surveying equipment.

    The results from the experiment indicates that the used, about 0.36 mm thick SikaPower 498, adhesive has an maximum shear strength of 37.3 MPa and a critical shear deformation of 482 µm. The fracture energy is for this thickness of the adhesive is determined as 12.9 kJ/m2.

    This report ends with a conclusion- and a suggested future work- chapter.

  • 1372.
    Walander, Tomas
    et al.
    University of Skövde, School of Technology and Society.
    Biel, Anders
    University of Skövde, School of Technology and Society.
    Stigh, Ulf
    University of Skövde, School of Technology and Society.
    An evaluation of the temperature dependence of cohesive properties for two structural epoxy adhesives2012In: 19th European Conference on Fracture, Kazan Scientific Centre of the Russian Academy of Sciences , 2012Conference paper (Refereed)
    Abstract [en]

    Cohesive modelling provides a more detailed understanding of the fracture properties of adhesivejoints than provided by linear elastic fracture mechanics. A cohesive model is characterized by astress-deformation relation of the adhesive layer. This relation can be measured experimentally.Two parameters of the stress-deformation relation are of special importance; the area under thecurve, which equals the fracture energy, and the peak stress. The influence of temperature of theseparameters is analyses experimentally and evaluated statistically for two structural epoxy adhesivesin the span from of -40°C to +80°C. The adhesives are used by the automotive industry and atemperature span below the glass transition temperature is considered. The results show that thattemperature has a modest influence on the adhesives Mode I fracture energy. For one of theadhesives, the fracture energy is independent of the temperature in the evaluated temperature span.In mode II, the influence of temperature is larger. The peak stresses decreases almost linearly withan increasing temperature in both loading cases and for both adhesives.

  • 1373.
    Walander, Tomas
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Biel, Anders
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Temperature dependence of cohesive laws for an epoxy adhesive in Mode I and Mode II loading2013In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 183, no 2, p. 203-221Article in journal (Refereed)
    Abstract [en]

    The influence of the temperature on the cohesive laws for an epoxy adhesive is studied in the glassy region, i.e. below the glass transition temperature. Cohesive laws are derived in both Mode I and Mode II under quasi-static loading conditions in the temperature range C. Three parameters of the cohesive laws are studied in detail: the elastic stiffness, the peak stress and the fracture energy. Methods for determining the elastic stiffness in Mode I and Mode II are derived and evaluated. Simplified bi-linear cohesive laws to be used at any temperature within the studied temperature range are derived for each loading mode. All parameters of the cohesive laws are measured experimentally using only two types of specimens. The adhesive has a nominal layer thickness of 0.3 mm and the crack tip opening displacement is measured over the adhesive thickness. The derived cohesive laws thus represent the entire adhesive layer as having the present layer thickness. It is shown that all parameters, except the Mode I fracture energy, decrease with an increasing temperature in both loading modes. The Mode I fracture energy is shown to be independent of the temperature within the evaluated temperature span. At C the Mode II fracture energy is decreased to about 2/3 of the fracture energy at C. The experimental results are verified by finite element analyses.

  • 1374.
    Waldemarson, Anna-Karin
    et al.
    University of Skövde, School of Technology and Society.
    Nilsson, Björn
    University of Skövde, School of Technology and Society.
    Kommunikation för ledare2005 (ed. 1)Book (Other academic)
  • 1375.
    Wallgren, Henric
    et al.
    University of Skövde, School of Technology and Society.
    Ytterby, Erik
    University of Skövde, School of Technology and Society.
    FÖRBÄTTRAD STYVHET AV KANTVIKMASKIN: Verktygsprismor2014Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Kantvikmaskin FUTURA PLUS 30 klarar idag att bocka en stålplåt, arbetsstycke, som är 3000 mm bred och 3 mm tjock med en acceptabel variation av bockradien. Målet med detta förbättringsarbete är att styvheten för de längsgående maskindelarna ska ökas, så att det är möjligt att bocka ett arbetsstycken som är 20 % tjockare än vad som är möjligt med dagens konstruktion. Genom att öka styvheten skall maskinen kunna hantera arbetsstycken av stål med en bredd upp till 3000 mm och en tjocklek upp till och med 3,6 mm med bibehållen variation av bockningsradie. Ökad styvhet innebär också att arbetsstycken med mindre tjocklek än den maximala kan bockas med större noggrannhet än dagen konstruktion. Detta kan leda till en större marknad för maskinen då kraftigare produkter eller produkter med en högre noggrannhet kan tillverkas med denna typ av maskin. Genom att optimera materialåtgången för maskindelarna minskas materialkostnaderna. Begränsningar i studien är att tillverkningskostnaden hos längsgående maskindelar skall förbli den samma som i dagens konstruktion.

    Genomgång av tidigare forskning gjord inom ämnet plåtbockning visar att erforderliga momentet för bockning kan beskrivas med hjälp av balkteori. Det konstateras att, enligt den linjärelastiska-idealplastiska materialmodellen, bockningsmomentet är proportionellt mot tjockleken i kvadrat för en balk. Detta samband används till en jämförelse mellan dagens maskinkonstruktion och en maskinkonstruktion som ska klara 20 % tjockare arbetsstycken. Detta samband och att deformationerna hos maskindelarna är linjärelastiska leder till att enhetslaster används.

    Studier av över- och under-prismorna visar att viss deformation kan avhjälpas med nya konstruktionsplåtar där en fotplåt för underprismat är det som mest reducerar deformationerna per viktenhet. Det slutgiltiga dimensioneringsförslaget leder till att maskindelarnas totala vikt minskas samtidigt som styvheten ökas till att klara 20 % tjockare arbetsstycken. Dock ökas antalet konstruktionsplåtar vilket kan leda till ökad produktionstid.

  • 1376.
    Wang, Jinjiang
    et al.
    University of Connecticut, Storrs, CT, USA.
    Gao, Robert X.
    University of Connecticut, Storrs, CT, USA.
    Yan, Ruqiang
    Southeast University, Nanjing, China.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    An EEMD and ICA-based Integrative Approach to Wind Turbine Gearbox Diagnosis2013In: Eighth CIRP Conference on Intelligent Computation in Manufacturing Engineering / [ed] Roberto Teti, Elsevier, 2013, Vol. 12, p. 133-138Conference paper (Refereed)
    Abstract [en]

    Increasing demand on energy has accelerated research on improving the reliability of wind turbines. As a critical component in wind turbine drivetrains, the majority of gearbox failures have shown to initiate from bearing failures. The low signal-to-noise ratio and transient nature of bearing signals pose significant difficulty for bearing defect diagnosis at the incipient stage. For improved bearing diagnosis, this paper presents a new method that integrates ensemble empirical mode decomposition (EEMD) with independent component analysis (ICA) to effectively separate bearing and gear meshing signals, without requiring a priori information on rotating speeds or bandwidth. The method first decomposes sensor measurement into a series of intrinsic mode functions (IMFs) as pseudo multi-channel signals, by means of EEMD, to satisfy the requirement by ICA for redundant information. ICA is performed on the IMFs to separate defective bearing components from gear meshing signal. Enveloping spectrum analysis is then performed to identify bearing structural defects. Both numerical and experimental studies have demonstrated the merit of the developed new method in improving gearbox diagnosis.

  • 1377.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    A Novel Collaborative Planning Approach for Digital Manufacturing2010In: Proceedings of the 6th CIRP-Sponsored International Conference on Digital Enterprise Technology / [ed] George Q. Huang, K. L. Mak, Paul G. Maropoulos, Berlin, Heidelberg: Springer Berlin/Heidelberg, 2010, p. 939-955Conference paper (Refereed)
    Abstract [en]

    The objective of this research is to develop methodology and algorithms for web-based digital manufacturing, supported by real-time monitoring for dynamic scheduling. This paper presents in particular an integrated approach for developing a web-based system, including distributed process planning, real-time monitoring and remote machining. It is enabled by a Wise-ShopFloor (Web-based integrated sensor-driven e-ShopFloor) framework targeting distributed yet collaborative manufacturing environments. Utilizing the latest Java technologies (Java 3D and Java Servlet) for system implementation, this approach allows users to plan and control distant shop floor operations based on runtime information from the shop floor. Details on the principle of the Wise-ShopFloor framework, system architecture, and a proof-of-concept prototype are reported in this paper. An example of distributed process planning for remote machining is chosen as a case study to demonstrate the effectiveness of this approach toward web-based digital manufacturing.

  • 1378.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Alternative Shop-Floor Re-Layout Design due to Dynamic Operation Changes2011In: ASME 2011 International Manufacturing Science and Engineering Conference, Volume 2, ASME Press, 2011, p. 127-133Conference paper (Refereed)
  • 1379.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    An ASP Approach to Adaptive Setup Planning and Merging for Available Machines2011Conference paper (Refereed)
  • 1380.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Challenges of Adaptive and Collaborative Manufacturing in the 21st Century2010In: Proceedings of the 14th International Conference on Machine Design and Production / [ed] M. Akkök et al., Middle East Technical University , 2010, p. 39-53Conference paper (Refereed)
    Abstract [en]

    Manufacturing has been one of the key areas that support and influence a nation’s economy since  the  18th  century.  Being  the  primary  driving  force  in  economy  growth,  manufacturing constantly serves as the foundation and contributes to other industries. In the past centuries, manufacturing contributed significantly to modern civilisation and created momentum that is driving today’s  economy. Despite of various revolutionary achievements, we are still facing challenges  when  striving  to  achieve  greater  success  in  manufacturing  in  the  21st  century. This paper highlights the challenges, particularly in adaptive and collaborative manufacturing, and offers a unique approach to solving the problems.

  • 1381.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Collaborations towards adaptive manufacturing2012In: Proceedings of the 2012 IEEE 16th International Conference on Computer Supported Cooperative Work in Design (CSCWD) / [ed] Liang Gao, Weiming Shen, Jean-Paul Barthès, Junzhou Luo, Jianming Yong, Wenfeng Li & Weidong Li, IEEE conference proceedings, 2012, p. 14-21Conference paper (Refereed)
    Abstract [en]

    This paper presents a new approach for real-time collaborations in adaptive manufacturing, including web-based remote monitoring and control of an industrial robot, and active collision avoidance for human-robot collaborations. It is enabled by using virtual 3D models driven by real sensor data and depth images of human operators. The objectives of this research are to significantly reduce network traffic needed for real-time monitoring over the Internet and to increase the human safety in a human-robot coexisting environment. The results of a case study show that the approach consumes less than 1% of network bandwidth of traditional camera-based methods, and is feasible and practical as a web-based solution.

  • 1382.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Combining Facility Layout Redesign and Dynamic Routing for Job-shop Assembly Operations2011In: Proceedings of 2011 IEEE International Symposium on Assembly and Manufacturing, IEEE, 2011, article id 5942302Conference paper (Refereed)
    Abstract [en]

    This paper presents a hybrid approach for facility layout redesign and dynamic job routing. More specifically, based on the source of uncertainty, the facility layout problem is split into two sub-problems and dealt with by two modules: relayout and find-route. Genetic algorithm is used where changes may cause a layout redesign of the entire shop, while function blocks are utilised to find the best sequence of robots for the new conditions within the existing layout. The method is verified in a case study of a hypothetic robotic assembly shop.

  • 1383.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Disassembly Planning by Motion Tracking Analysis2011In: Proceedings of International Conference on Remanufacturing, University of Strathclyde , 2011, p. 182-186Conference paper (Refereed)
    Abstract [en]

    This paper presents an integrated intuitive system for disassembly planning by actively tracking the motion of an experienced operator. It can also be used for operators training by combining a virtual reality (VR) environment with the motion tracking. The developed conceptual prototype for disassembly planning and training enables individuals to interact with a virtual environment in real time. It extends the technology of motion tracking and integrates it with virtual environment technology to create real-time virtual work cell simulations in which disassembly operators may be immersed with hands-on experiences. In addition to the operators training, the experimental results to date are presented to demonstrate the potential contributions of human skills in achieving effective disassembly planning for remanufacturing. It is expected that this approach will lead to environment-friendly and sustainable operations by conserving energy and cost that are first tested in a human-emerged virtual system.

  • 1384.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    International Journal of Manufacturing Research2012Collection (editor) (Refereed)
  • 1385.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2012Collection (editor) (Refereed)
  • 1386.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2012Collection (editor) (Refereed)
  • 1387.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    International Journal of Manufacturing Research2011Collection (editor) (Refereed)
  • 1388.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2011Collection (editor) (Refereed)
  • 1389.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2010Collection (editor) (Refereed)
  • 1390.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2010Collection (editor) (Refereed)
  • 1391.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2010Collection (editor) (Refereed)
  • 1392.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2009Collection (editor) (Refereed)
  • 1393.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2009Collection (editor) (Refereed)
  • 1394.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    International Journal of Manufacturing Research2011Collection (editor) (Refereed)
  • 1395.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    International Journal of Manufacturing Research2011Collection (editor) (Refereed)
  • 1396.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    International Journal of Manufacturing Research2009Collection (editor) (Other academic)
  • 1397.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Overview of an adaptive setup planning approach for job shop operations2009In: ASME 2009 International Manufacturing Science and Engineering Conference, Volume 1: Advances in Manufacturing Process Planning and Scheduling, ASME Press, 2009, p. 221-229Conference paper (Refereed)
    Abstract [en]

    This paper presents an overview of an adaptive setup planning system that considers both the availability and capability of machines on a shop floor. It integrates scheduling functions at setup planning stage, and utilizes a two-step decision-making strategy for generating machine-neutral and machine-specific optimal setup plans. The objective is to enable adaptive setup planning for dynamic machining job shop operations. Particularly, this paper documents basic algorithms and architecture of the setup planning system for dynamically assigned machines. It is then validated through a case study.

  • 1398.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Planning towards enhanced adaptability in digital manufacturing2011In: International journal of computer integrated manufacturing (Print), ISSN 0951-192X, E-ISSN 1362-3052, Vol. 24, no 5, p. 378-390Article in journal (Refereed)
    Abstract [en]

    This paper presents an integrated approach for developing a web-based system with enhanced adaptability, including distributed process planning, real-time monitoring and remote machining. The objective is to develop a new methodology and relevant processing algorithms for enhancing adaptability in digital manufacturing. This approach is enabled by a Wise-ShopFloor (Web-based integrated sensor-driven e-ShopFloor) framework targeting distributed yet collaborative manufacturing environments. Utilising the latest Java technologies (Java 3D and Java Servlet) for system implementation, it allows end-users to plan and control distant manufacturing operations based on runtime information from shop floors. Details on the principle of the Wise-ShopFloor framework, system architecture, and a prototype system are reported in this paper. An example of distributed process planning for remote machining is chosen as a case study to demonstrate the effectiveness of this approach toward web-based digital manufacturing.

  • 1399.
    Wang, Lihui
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Wise-Shop Floor: Linking Virtual Manufacturing to Real Productions2009In: The International 3rd Swedish Production Symposium / [ed] B. G. Rosén, The Swedish Production Academy , 2009, p. 164-169Conference paper (Refereed)
    Abstract [en]

    This paper presents an integrated approach for web-based sensor-driven real-time monitoring and control. it is enabled by a Wise-ShopFloor (Web-based integrated sensor-driven e-ShopFloor) framework targeting distributed yet collaborative manufacturing environments. The objective of this research is to develop methodology and algorithms that utilise virtual manufacturing technology for real production. Details on the principle of the Wise-ShopFloor framework, system architecture, and a proof-of-concept prototype are reported in this paper. Remote machining is chosen as a case study to demonstrate the effectiveness of this approach toward web-based manufacturing.

  • 1400.
    Wang, Lihui
    et al.
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Adamson, Göran
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Holm, Magnus
    University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society.
    Moore, Philip
    Mechatronics Research Centre, De Montfort University, Leicester LE1 9BH, United Kingdom.
    A review of function blocks for process planning and control of manufacturing equipment2012In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 31, no 3, p. 269-279Article, review/survey (Refereed)
    Abstract [en]

    Manufacturing in a job-shop environment is often characterized by a large variety of products in small batch sizes, requiring real-time monitoring for dynamic distributed decision making, and adaptive control capabilities that are able to handle, in a responsive way, different kinds of uncertainty, such as changes in demand and variations in production capability and functionality. In many manufacturing systems, traditional methods, based on offline processing performed in advance, are used. These methods are not up to the standard of handling uncertainty, in the dynamically changing environment of these manufacturing systems. Using real-time manufacturing intelligence and information to perform at a maximum level, with a minimum of unscheduled downtime, would be a more effective approach to handling the negative performance impacts of uncertainty. The objective of our research is to develop methodologies for distributed, adaptive and dynamic process planning as well as machine monitoring and control for machining and assembly operations, using event-driven function blocks. The implementation of this technology is expected to increase productivity, as well as flexibility and responsiveness in a job-shop environment. This paper, in particular, presents the current status in this field and a comprehensive overview of our research work on function block-enabled process planning and execution control of manufacturing equipment.

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