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  • 1.
    Amoson, Jonas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Building complex GUIs in Plan 92009Inngår i: Proceedings 4th International Workshop on Plan9, Athens, GA: University of Georgia , 2009, s. 15-21Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    How can non-trivial graphical user interfaces be designed in Plan 9 without them losing their minimalistic style? Different toolkits are discussed, and a proposal for a tabbed toolbar is suggested as a way to add functionality without cluttering the interface and avoiding the use of pop-up dialog boxes. A hypothetical port to the GUI in LyX is used as an example.

  • 2.
    Amoson, Jonas
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Lundqvist, Thomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    A light-weigh non-hierarchical file system navigation extension2012Inngår i: Proceedings of the 7th International Workshop on Plan 9 / [ed] Eric Jul, Dublin, Ireland, 2012, s. 11-13Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Drawbacks in organising and finding files in hierarchies have led researchers to explorenon-hierarchical and search-based filesystems, where file identity and belonging is pred-icated by tagging files to categories. We have implemented a chdir() shell extension en-abling navigation to a directory using a search expression. Our extension is light-weightand avoids modifying the file system to guarantee backwards compatibility for applicationsrelying on normal hierarchical file namespaces.

  • 3. Andersson, M.
    et al.
    Heldal, R.
    Christiernin, Linn G.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Applying task-based division in multi-layered design: an industrial case study2005Inngår i: Human-Computer Interaction 2005: Proceeding of The IASTED International Conference on Human-Computer Interaction (IASTED-HCI)Phoenix, USA, November 14 - 16, 2005, Acta Press , 2005Konferansepaper (Fagfellevurdert)
  • 4.
    Asker Zada, Salar
    Högskolan Väst, Institutionen för ekonomi och it.
    Ad Hoc Networks: Performance Evaluation Of Proactive, Reactive And Hybrid Routing Protocols In NS2 2010Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    No infrastructure, no centralized administration and self-configuration are the main characteristics of MANETs. The primary motivation of MANET deployment is to increase portability, mobility and flexibility. However, this mobility causes an unpredictable change in topology and makes routing more difficult. Many routing algorithms have been proposed and tested over the last few years in order to provide an efficient routing in Ad Hoc networks. In this report we will show our conducted study with AODV (reactive), DSDV (proactive) and ZRP (hybrid) routing protocols. The performance of routing protocols have been evaluated carefully by analyzing the affects of changing network parameters such as, number of nodes, velocity, pause time, workload and flows on three performance metrics: packet delivery ratio, routing cost and average end- to- end delay. All the simulation work has been conducted in NS2. Our simulation results show that AODV gives better performance in all designed simulation models in terms of packets delivery ratio. DSDV shows the second best performance. Performance of ZRP is found average.

  • 5.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Performance Prediction of Future Generation Computer Systems2006Inngår i: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain, Feb 25-28, 2006, s. 42-48Konferansepaper (Annet vitenskapelig)
  • 6.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Wombat lurar nätskurkarna2006Inngår i: Datormagazin, ISSN 1650-1306, nr 10, s. 86-90Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 7.
    Boklund, Andreas
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Johansson, Christer
    Lindell, Håkan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    A Comprative Study of Forward and Reverse Engineering in UML Tools2007Inngår i: Proceedings of the International Conference on Applied Computing: Salamanca 2007, Spain, IADIS , 2007, s. 535-540Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In the process of developing computer based applications the use of descriptive models to depict the architecture and design of the application is practical and brings many advantages. The most commonly used standard today is the Unified Modeling Language. There are many tools that implemented support for this standard for modeling, and they vary in functionality. A comparative study, including a selection of these tools, will show advantages and disadvantages for each tool. The purpose of this study is to test a selection of these modeling tools for a typical three-tier layered web service application. The tools tested in this study are Microsoft Visual Studio 2005 .NET Beta, PowerDesigner and Visual Paradigm. Rational Rose would have been included if it would have supported C#. In this study tests are performed in regard to modeling a class diagram, forward engineering to source code from the class diagram and reverse engineering from source code to class diagram. Despite the shortage of diagram types MS Visual Studio proved to be the most reliable tool for this particular type of applications.

  • 8.
    Boklund, Andreas
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Namaki, Nima
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Jiresjö, Christian
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    A characterisation tool for the impact of network deficiencies on HPC applications2008Inngår i: Proceedings of the 2008 International Conference on Parallel and Distributed Processing Techniques and Applications, PDPTA 2008, 2008, s. 888-894Konferansepaper (Annet vitenskapelig)
  • 9. Bäckman, R
    et al.
    Christiernin, Linn G.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    MIDAS: a process support tool for multi-layered designsInngår i: Journal of Information Technology Theory and Application, ISSN 1552-6496, E-ISSN 1532-4516Artikkel i tidsskrift (Annet vitenskapelig)
  • 10. Calås, G.
    et al.
    Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Robustness Analysis and Technology Forecasting: Survey on a Missing Combination in Software Development2006Inngår i: Proceedings of the International conference on Software Engineering :: innsbruck, Austria, 2006, s. 329-334Konferansepaper (Annet vitenskapelig)
  • 11.
    Calås, Göran
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    A First Draft of RATF: A Method Combining Robustness Analysis and Technology Forecasting2006Inngår i: Information Technology: New Generations, 2006. ITNG 2006. Third International Conference on, 2006, s. 72-77Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    This paper is based on an extensive study performed on a large software suite for over a decade. From the experiences derived from this study we created a first draft of a method combining an extended robustness analysis (RA) method with the future oriented method of technology forecasting (TF). In this method TF provides information about the systems future evolution to the RA which then generates the software design. The RA and TF methods then form a feedback loop, which results in an improved reusable and robust software design. The purpose of the RATF method is to predict the evolutional path of the software system, thus making preparations for (example) functionality that will be needed in future generations, i.e. utilizing the power-of-prediction to implement the base of tomorrow's functions today

  • 12.
    Calås, Göran
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Combining robust analysis and technology forecasting: A missing combination in contemporary methods2006Inngår i: Proceedings of the IASTED International Conference on Software Engineering: as part of the 24th IASTED International Multi-Conference on APPLIED INFORMATICS, Innsbruck, 2006, s. 329-334Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Seven software engineering methods and one general purpose system engineering method TRIZ was evaluated concerning their abilities to combine software technology forecasting, that is prediction of potential software evolution with robustness analysis, which is a method to model a system tolerant to changes. None of the investigated software engineering method or process concepts combines software technology forecasting with robustness analysis to any great extent. Several of the methods evaluated do contribute with techniques and principles, that potentially could be combined and give systematically technology forecasting with comprehensively robustness analysis though. This defines a new frontier for research into a combined "super class" method for software development.

  • 13.
    Christiernin Gustafsson, Linn
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Gustavsson, M.
    Ohlsson, A.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Prototyping a Multi-Layered Help - a User Involved Exploratory Design2006Inngår i: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, s. 315-323Konferansepaper (Annet vitenskapelig)
  • 14.
    Christiernin, Linn G.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Guiding the designer: a radar diagram process for applications with multiple layers2010Inngår i: Interacting with computers, ISSN 0953-5438, E-ISSN 1873-7951, Vol. 22, nr 2, s. 107-122Artikkel i tidsskrift (Fagfellevurdert)
  • 15.
    Christiernin, Linn G.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Pros, cons and problems with the MLD concept: M+ a suggestion for the next generation of layered structuresInngår i: Journal of Computer Science and Technology, ISSN 1000-9000, E-ISSN 1860-4749Artikkel i tidsskrift (Fagfellevurdert)
  • 16.
    Christiernin, Linn G.
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Olsson, A
    Boklund, Andreas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    A case study evaluation of RDPM: a process confirmed successfulInngår i: Interacting with computers, ISSN 0953-5438, E-ISSN 1873-7951Artikkel i tidsskrift (Fagfellevurdert)
  • 17.
    de Blanche, Andreas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Operativsystem: teori och praktiskt handhavande2008Bok (Annet vitenskapelig)
  • 18.
    de Blanche, Andreas
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för data- och elektroteknik.
    Lundqvist, Thomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för data- och elektroteknik.
    A methodology for estimating co-scheduling slowdowns due to memory bus contention on multicore nodes2014Inngår i: Proceedings of the IASTED International Conference on Parallel and Distributed Computing and Networks, PDCN 2014, ACTA Press, 2014, s. 216-223Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When two or more programs are co-scheduled on the same multicore computer they might experience a slowdown due to the limited off-chip memory bandwidth. According to our measurements, this slowdown does not depend on the total bandwidth use in a simple way. One thing we observe is that a higher memory bandwidth usage will not always lead to a larger slowdown. This means that relying on bandwidth usage as input to a job scheduler might cause non-optimal scheduling of processes on multicore nodes in clusters, clouds, and grids. To guide scheduling decisions, we instead propose a slowdown based characterization approach. Real slowdowns are complex to measure due to the exponential number of experiments needed. Thus, we present a novel method for estimating the slowdown programs will experience when co-scheduled on the same computer. We evaluate the method by comparing the predictions made with real slowdown data and the often used memory bandwidth based method. This study show that a scheduler relying on slowdown based categorization makes fewer incorrect co-scheduling choices and the negative impact on program execution times is less than when using a bandwidth based categorization method.

  • 19.
    de Blanche, Andreas
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för data- och elektroteknik.
    Lundqvist, Thomas
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för data- och elektroteknik.
    Addressing characterization methods for memory contention aware co-scheduling2015Inngår i: Journal of Supercomputing, ISSN 0920-8542, E-ISSN 1573-0484, Vol. 71, nr 4, s. 1451-1483Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ability to precisely predict how memory contention degrades performance when co-scheduling programs is critical for reaching high performance levels in cluster, grid and cloud environments. In this paper we present an overview and compare the performance of state-of-the-art characterization methods for memory aware (co-)scheduling. We evaluate the prediction accuracy and co-scheduling performance of four methods: one slowdown-based, two cache-contention based and one based on memory bandwidth usage. Both our regression analysis and scheduling simulations find that the slowdown based method, represented by Memgen, performs better than the other methods. The linear correlation coefficient (Formula presented.) of Memgen's prediction is 0.890. Memgen's preferred schedules reached 99.53 % of the obtainable performance on average. Also, the memory bandwidth usage method performed almost as well as the slowdown based method. Furthermore, while most prior work promote characterization based on cache miss rate we found it to be on par with random scheduling of programs and highly unreliable.

  • 20.
    de Blanche, Andreas
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Availability of Unused Computational Resources in an Ordinary Office Environment2010Inngår i: Journal of Circuits, Systems and Computers, ISSN 0218-1266, Vol. 19, nr 3, s. 557-572Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The study presented in this paper highlights an important issue that was subject for discussionsand research about a decade ago and now have gained new interest with the current advances ofgrid computing and desktop grids. New techniques are being invented on how to utilize desktopcomputers for computational tasks but no other study, to our knowledge, has explored theavailability of the said resources. The general assumption has been that there are resources andthat they are available. The study is based on a survey on the availability of resources in anordinary o±ce environment. The aim of the study was to determine if there are truly usableunder-utilized networked desktop computers available for non-desktop tasks during the off-hours. We found that in more than 96% of the cases the computers in the current investigationwas available for the formation of part-time (night and weekend) computer clusters. Finally wecompare the performance of a full time and a metamorphosic cluster, based on one hypotheticallinear scalable application and a real world welding simulation.

  • 21.
    Flensburg, Per
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik. Högskolan Väst, Institutionen för ekonomi och it, Avd för informatik.
    Om kopieringsskydd2007Inngår i: Digital life : magasinet för en digital livsstil, nr 9Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 22.
    Gellerstedt, Martin
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Petersen, Per Hyltoft
    University of Bergen, Bergen, Norway.
    Partitioning reference values for several subpopulations using cluster analysis.2007Inngår i: Clinical Chemistry and Laboratory Medicine, ISSN 1434-6621, E-ISSN 1437-4331, Vol. 45, nr 8, s. 1026-32Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    BACKGROUND: A crucial question when developing reference intervals is whether different subpopulations need their own reference interval or if a single joint reference interval can be used. It is reasonable to use partitioned reference intervals in situations where a single interval results in considerable variation in sensitivity between subpopulations. The aim of partitioning is to harmonize the sensitivity of the reference intervals, i.e., to make the sensitivity similar for all patients, regardless of patient characteristics. Statistical criteria to identify when partitioning is adequate have been developed over the last two decades. These criteria are applicable when considering two subpopulations, but recently a procedure for considering several subpopulations has been developed. When several subpopulations are considered, there is a possibility that some subpopulations could form a group or cluster that could share a common reference interval. However, there is no formal systematic approach to indicate how to divide these subpopulations into clusters. The aim of this study was to suggest such a systematic approach for clustering. METHODS: A clustering technique was applied to data including several subpopulations. The technique is based on measuring the distance between separated reference limits and successively pooling subpopulations divided by short distances. A cluster is defined by a group of subpopulations that are close to each other and that differ from subpopulations in another cluster. A cluster recruits new subpopulations as long as the subpopulations can be pooled without violating a partitioning criterion. CONCLUSIONS: We have suggested a procedure for partitioning a number of Gaussian (or Gaussian-transformable) subpopulations into clusters. This is the only formalized procedure indicating how to analyze several subpopulations and identify a suitable number of groups and reference intervals. Using a computer program developed for partitioning issues, the approach was easy to adopt.

  • 23.
    Gunnarsson, Maj
    et al.
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Lindroth, Tomas
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Magnusson, Maria
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Rasmusson, Peo
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Lundh Snis, Ulrika
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Less is more: When IT comes to knowledge management2000Inngår i: Proceedings of IRIS23, 2000, Vol. 23Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this work we take the point of departure from two thoroughly conducted casestudies, in which we have analysed certain knowledge work activities with followingimplications for design. Both studies clearly stated the call for a ICT-support whensearching information and sharing knowledge. For example, sharing bookmarksamong knowledge workers seemed to be a necessary and useful activity. Importantand valuable bookmarks often mirror what kind of information and knowledgepeople are looking for, and also what kind of forum they usually go to on the worldwide web. In this work we have developed a prototype, KnowMan, which managesbookmarks on the world wide web. The prototype is designed as a user-friendly"pad-interface" in which bookmarks can be collaboratively collected, shared andfurther explored and annotated by other knowledge workers. We end up with ageneral discussion about the possible effects of using KnowMan and what furtherdesign aspects that should be considered.

  • 24.
    Gustavsson Christiernin, Linn
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Layered design: concepts, case studies and processes - theories and implementations2007Doktoravhandling, med artikler (Annet vitenskapelig)
  • 25.
    Gustavsson Christiernin, Linn
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Erstorp, Ulf
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Magnusson, Staffan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Ångfors, Peter
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Easylayer: MLD in an application portal with multiple user groups2007Inngår i: Proceedings of the Iadis International Conference Applied Computing 2007: Salamanca, Spain 18-20 February 2007, IADIS , 2007, s. 27-34Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In large organizations there are usually rather large groups of heterogeneous users with different tasks and different needs. Their requirements would most likely vary a lot when the system is designed to grant them access to different parts of the functions and applications In our earlier work we have tested the interface concept of Multi-Layered Design (MLD) on an operating system where each layer had a set of applications and tools. The users working with the system could get access to different applications depending on their level of experience or their different needs. The current paper presents how the MLD concept is taken one step further; implementing a layered design in a multi-user portal on a Citrix server. When a network solution is used, new available possibilities are given. The MLD approach can be combined with a role based access technique can the layered structure can be used in different ways for many different groups of users. In the study a MLD mushroom structure is employed where the user category decides the set of layers the different user groups can choose from while the individual user’s tasks and experience guide the choice of the specific layer. Thin clients are used to access the layer structure and five personas are made to represent the potential user groups. The results show that MLD can be used within a Citrix environment and that it is a viable alternative or complement for multi-user portals

  • 26.
    Gustavsson Christiernin, Linn
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Lindahl, Fredrik
    Chalmers University of Technology, Sweden.
    Torgersson, Olof
    Chalmers University of Technology, Sweden.
    Designing a multi-layered image viewer2004Inngår i: ACM International Conference Proceeding Series Vol 82: proceedings of the third Nordic conference on Human-computer interaction NordiCHI '04 , Tampere, Finland, ACM , 2004, s. 181-184Konferansepaper (Fagfellevurdert)
  • 27.
    Haj-Bolouri, Amir
    Högskolan Väst, Institutionen för ekonomi och it.
    Semantiska webben och sökmotorer2010Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Den här semantiska webben. Syftet är att undersöka hur den semantiska webben påverkar sökmotorer på webben. Detta sker genom en undersökning av tio olika sökmotorer där nio är semantiskt sådana och den tionde är den mest använda sökmotorn idag. Studien är genomförd som både en deskriptiv och kvantitativ studie. En litteraturundersökning har också genomförts om den semantiska webben och sökmotorer. Slutsatserna av den här studien är att den semantiska webben är mångfacetterad med dess definitioner, och att resultatet kring hur konkreta sökmotorer tillämpar semantiska webbprinciper kan variera beroende vilken sökmotor man interagerar med.Nyckelord: Semantic web, Semantiska webben, Semantik, Informatik, Web 2.0, Internet, Search engines, Sökmotorerthat relates to the semantic web. Therapporten behandlar definitioner av begrepp som är kopplade till denDen här semantiska webben. Syftet är att undersöka hur den semantiska webben påverkar sökmotorer på webben. Detta sker genom en undersökning av tio olika sökmotorer där nio är semantiskt sådana och den tionde är den mest använda sökmotorn idag. Studien är genomförd som både en deskriptiv och kvantitativ studie. En litteraturundersökning har också genomförts om den semantiska webben och sökmotorer. Slutsatserna av den här studien är att den semantiska webben är mångfacetterad med dess definitioner, och att resultatet kring hur konkreta sökmotorer tillämpar semantiska webbprinciper kan variera beroende vilken sökmotor man interagerar med.

  • 28.
    Hrastinski, Stefan
    et al.
    KTH Royal Institute of Technology,Division of Digital Learning, Stockholm, Sweden.
    Olofsson, Anders D.
    Umeå University, Department of Applied Educational Science, Umeå, Sweden.
    Arkenback, Charlotte
    University of Gothenburg, Department of Applied IT, Gothenburg, Sweden.
    Ekström, Sara
    Högskolan Väst, Institutionen för ekonomi och it, Avd för medier och design.
    Ericsson, Elin
    University of Gothenburg, Department of Applied IT, Gothenburg, Sweden.
    Fransson, Göran
    University of Gävle, Faculty of Education and Business Studies, Gävle, Sweden.
    Jaldemark, Jimmy
    Mid Sweden University, Department of Education, Sundsvall, Sweden.
    Ryberg, Thomas
    Aalborg University, Department of Communication and Psychology, Aalborg, Denmark.
    Öberg, Lena-Maria
    Mid Sweden University, Department of Computer and System Science, Östersund, Sweden.
    Fuentes, Ana
    Högskolan Väst, Institutionen för ekonomi och it.
    Gustafsson, Ulrika
    Umeå University, Department of Applied Educational Science, Umeå, Sweden.
    Humble, Niklas
    Mid Sweden University, Department of Computer and System Science, Östersund, Sweden.
    Mozelius, Peter
    Mid Sweden University, Department of Computer and System Science, Östersund, Sweden.
    Sundgren, Marcus
    Mid Sweden University, Department of Education,Sundsvall, Sweden.
    Utterberg, Marie
    University of Gothenburg,Department of Applied IT, Gothenburg, Sweden.
    Critical Imaginaries and Reflections on Artificial Intelligence and Robots in Postdigital K-12 Education2019Inngår i: Postdigital Science and Education, ISSN 2524-485X, Vol. 1, nr 2, s. 427-445Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is commonly suggested that emerging technologies will revolutionize education. In this paper, two such emerging technologies, artificial intelligence (AI) and educational robots (ER), are in focus. The aim of the paper is to explore how teachers, researchers and pedagogical developers critically imagine and reflect upon how AI and robots could be used in education. The empirical data were collected from discussion groups that were part of a symposium. For both AI and ERs, the need for more knowledge about these technologies, how they could preferably be used, and how the emergence of these technologies might affect the role of the teacher and the relationship between teachers and students, were outlined. Many participants saw more potential to use AI for individualization as compared with ERs. However, there were also more concerns, such as ethical issues and economic interests, when discussing AI. While the researchers/developers to a greater extent imagined ideal future technology-rich educational practices, the practitioners were more focused on imaginaries grounded in current practice.

  • 29.
    Igugu Onajite, Johnson
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    LAPSync: a Location-Aware Protocol for Remote File Synchronization2012Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Commercial provisioning of file synchronization services (FSS) relies entirely on protocols that utilize a remote central server that is often located in the cloud to host important files. Updates at user computers are propagated to the central server and from the central server to other sources in need of such updates. Therefore, a synchronization operation between two computers located on the same network often results in file data transmission to and from this local network at least twice. This introduces an unnecessary bandwidth usage on a user’s local network and has become an issue, especially since there is an increase in the demands for internet resources.

    This thesis work presents a new file synchronization protocol towards FSS known as LAPSync (location-aware protocol for remote file synchronization). This paper also proposes a hierarchical synchronization mechanism by utilizing LAPSync. Our proposed solution relies on the ability of LAPSync clients to acquire knowledge about the location of clients participating in the synchronization operation to construct a hierarchical synchronization path. Finally, we implement our protocol into a prototype and conduct experiments to compare with drop-box (a popular file synchronization service). The results obtained show that LAPSync offers a reduction in bandwidth usage when the files to be synchronized exist on the same local network

  • 30.
    Jenkins, Samantha
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Kirk, Steven R.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    An investigation of the merging and collapsing of software2007Inngår i: Advances in Complex Systems, ISSN 0219-5259, Vol. 10, nr 3, s. 379-393Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We explore the use of complex networks for understanding of the interaction of computer software applications written in the Java object-oriented language with the "library classes" that they use (those provided by the Java Runtime Environment) as, essentially, a merged network of classes. The dependence of the software on the library is quantified using a recently introduced model that identifies phases close to a second-order phase transition existing in scale-free networks. An example is given of a piece of software whose class network collapses without the presence of the library classes, providing validation of a novel structural coupling measure; Rcoupling. The structural properties of the merged software-Java class networks were found to correlate with the proportion of Java classes contained within the subset delimited by Rcoupling. A mechanism for the preservation of the software class network is also provided for the cases studied where the removal of the library classes does not cause collapse.

  • 31.
    Jiresjö, Christian
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Benefits of Alternative Network Topologies For COTS Linux Clusters2006Inngår i: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, s. 457-461Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The focus of this paper is to evaluate the use of two different network topologies for Ethernet networks in small Common

    Off The Shelf (COTS) clusters. The fully meshed network topology was evaluated and its impact on latency and

    bandwidth was measured and compared to the more traditional switched network topology. This was done at MPI level

    by measuring the point-to-point round trip latency (ping-pong) and all-to-alla bandwidth for different sized messages.

    The results from the experiments are presented and the overall the benefits and drawbacks of the both approaches are

    discussed.

  • 32.
    Johansson, Daniel
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Jibing, Gustav
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Krantz, Johan
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Prestandajämförelse mellan Amazon EC2 och privat datacenter2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Publika moln har sedan några år tillbaka blivit ett alternativ för olika företag att använda istället för lokala datacenter. Vad publika moln erbjuder är en tjänst som gör det möjligt för företag och privatpersoner att hyra datorkapacitet. Vilket gör att de inte längre behöver spendera pengar på resurser som inte används. Istället för att köpa en stor andel hårdvara och uppskatta hur stor kapacitet som man behöver kan man nu istället så smått börja utöka efter behov eller minska ifall det önskas. Därmed behöver företag inte spendera pengar på hårdvara som inte används eller har för lite datorkapacitet, vilket skulle kunna resultera i att stora batcharbeten inte blir färdiga i tid och i och med det kan företaget förlora potentiella kunder. Potentiella problem  kan dock uppstå när man i ett moln virtualiserar och försöker fördela datorkapacitet mellan flera tusen instanser. Där även skalbarhet inte ska ha några begränsningar, enligt moln-leverantörerna.

    I denna rapport har vi med hjälp av olika benchmarks analyserat prestandan hos den största publika moln-leverantören på marknaden, Amazon, och deras EC2- och S3-tjänster. Vi har genomfört prestandatester på systemminne, MPI och hårddisk I/O. Då dessa är några av de faktorer som hindrar publika moln från att ta över marknaden, enligt artikeln Above The Clouds -  A Berkely View of Cloud Computing [3].  Sedan har vi jämfört resultaten med prestandan på ett privat moln i ett datacenter. Våra resultat indikerar att prestandan på det publika molnet inte är förutsägbar och måste få en ordentlig skjuts för att stora företag ska ha en anledning till att börja använda det.

  • 33.
    Johansson, Jim
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Microsoft WebMatrix: Enkelheten i dynamiska webbaserade system2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Studien bygger utifrån problematik i ett tidigare system där önskemål har lagts fram om att förbättra systemet till ett nytt. Det nya systemet har utvecklats till ett dynamiskt webbaserat system och implementerats med det nya utvecklingsverktyget Microsoft WebMatrix. Microsoft påstår att utveckla webbsidor med WebMatrix har aldrig varit enklare, ett påstående som anses vagt.Syftet med studien är att analysera verktyget och dess nya tekniker, därefter resultera om citatet enligt Microsoft är delvis sant eller inte, om WebMatrix samt den nya tekniken upplevs enkel att använda. Studien beskriver även den bakomliggande problematiken samt vilka tekniker som har implementerats i det nya systemet med hjälp av WebMatrix. Syftet med det tidigare samt det nya systemet är tjänsteplanering av personal inom organisation Högskolan Väst i Trollhättan. Målet är att förenkla och förbättra tjänsteplaneringen.Studien och implementationen av systemet har resulterat i att WebMatrix upplevs som enkelt och har ett innehåll av användbara tekniker som bidrar till en effektiv utveckling. Det nya systemet som har skapats har resulterat i att vara en positiv lösning där möjligheten att tjänsteplanera har blivit förenklat. Systemet innehåller endast funktionalitet som är relevant, har bättre överblick samt en struktur som gör det enklare att administrera. Till skillnad från det tidigare systemet lagras data i en databas, detta har bidragit till ett mycket positivt intryck av systemets användare med tanke på gemensam tillgänglighet.

  • 34.
    Johansson, Lars-Olof
    et al.
    Halmstad University, Sweden.
    Lundh Snis, Ulrika
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    The dynamics of interaction: exploring a living lab innovation process from a community of practice perspective2011Inngår i: Proceedings of Pacific Asia Conference on Information Systems (PACIS) 2011, Association for Information Systems, 2011, artikkel-id 85Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper is based on a living lab project, which is an open, user-centric, innovation approach, where several actors from industry, user groups and academia are involved. The research question is: How can interaction dynamics be understood in a living lab innovation process? We applied an action-oriented research approach, where the empirical results are from The Find Project (TFP), which aim is to customize an ICT product based on the needs of a user group. The findings are analyzed from a community of practice perspective where three different communities, i) researchers from Halmstad Living Lab (HLL), ii) ICT developers (ICTD) and iii) next of kin of demented elderly persons (NOKD), represented the unit of analysis. We identified situations and activities that played a vital role for the innovation process in terms of boundary interaction dynamics. The contribution of our research to innovation theory is a combination and further exploration of the boundary spanning and communities of practice theories. We have developed a conceptual model describing the dynamics in boundary interactions of an ICT innovation process with regard to boundary objects-inuse and brokering. The conceptual model highlights two different levels of brokering: i) inner-level brokering and ii) outer-level brokering.

  • 35.
    Johansson, Pierre E. C.
    et al.
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Enofe, Martin O.
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Schwarzkopf, Moritz
    Volvo Group Trucks Operations, Gothenburg 405 08, Sweden.
    Malmsköld, Lennart
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för produktionssystem (PS).
    Fast-Berglund, Åsa
    Chalmers University of Technology, Gothenburg 412 96, Sweden.
    Moestam, Lena
    Data and Information Handling in Assembly Information Systems: A Current State Analysis2017Inngår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 11, s. 2099-2106Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Products become more complex as the general technology development reaches new levels. These new technologies enable manufacturing companies to offer better products with new functionalities to their customers. Complex products require adequate manufacturing systems to cope with changing product requirements. In general, manufacturing of this type of products entails complex structured and rigid IT systems. Due to the system’s complexity and comprehensive structure, it becomes challenging to optimize the information flow. There are improvement potentials in how such systems could be better structured to meet the demands in complex manufacturing situations. This is particularly true for the vehicle manufacturing industry where growth in many cases have occurred through acquisitions, resulting in increased levels of legacy IT systems. Additionally, this industry is characterized by high levels of product variety which contribute to the complexity of the manufacturing processes. In manual assembly of these products, operations are dependent on high quality assembly work instructions to cope with the complex assembly situations. This paper presents a current state analysis of data and information handling in assembly information systems at multiple production sites at a case company manufacturing heavy vehicles. On basis of a certain set of characterizing manual assembly tasks for truck, engine and transmission assembly, this work focuses on identifying what data and information that is made available to operators in terms of assembly work instructions and the importance of such data and information. This work aims to identify gaps in the information flow between manufacturing engineering and shop floor operations. © 2017 The Authors

  • 36.
    Köhler, Veronica
    Högskolan Väst, Institutionen för omvårdnad, hälsa och kultur.
    Co-Creators of Scope of Action: An exploration of the dynamic relationship between people, IT, and work in a nursing context2006Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    Information Technology (IT) is today widespread in our work places, in our spare time and in our society overall. Implementations of IT in organizations come with high expectations on effectiveness, revenue, smoother work processes and so on. However, this simplified view on IT ignores the fact that it is the IT usage rather than the IT artifact per se that in the end decides the effect of an implementation of IT. Although the IT artifact certainly has been designed to support certain tasks and processes, the success or failure of the Information System (IS) in the end depends on the individuals' actions, which ultimately depend on their perceptions and interpretations of the IS. Thus, when technology is being implemented and becomes an IS in use, it becomes a part of work, and as such more of a social system than a technological one.

    The actual result of a design process does not solely consist of things or artifacts, but above all changed action patterns for the users. From this follows that we must consider design of artifacts as something more than merely the constructing of actual objects with functions and properties that are easily measured. Rather, a large part of all design activities has to do with design of conceivable social milieus, not artifacts. Thus, design may be defined as the suggesting and establishing of scope of action. The concept scope of action aims at describing the fact that the design of, and consequently the implementation of, a specific IT artifact always aims at creating a certain scope of action; some actions are made easier, others are made more difficult or even impossible. This scope of action has to some extent been deliberately designed, but these changes may on the other hand also be undesired and not predicted in advance. The complexity of this phenomenon is great and hard to grasp in advance. However, this does not mean that we can allow ourselves to ignore exploring this phenomenon more deeply. On the contrary, with a usage perspective on IS success or failure, scope of action becomes very important.

    Although the term scope of action may seem a rather intuitive concept, we need more concrete knowledge about its character in order to be able to understand IT usage, both when designing a new IT artifact and when studying or evaluating IT. Thus, our intuitive understanding of the concept needs to be complemented with theory on the ‘constituents’ and effects of this phenomenon. For this purpose, in this thesis nurses’ use of the Electronic Patient record (EPR) is being explored in order to gain an empirically derived understanding of the character of scope of action.

    The research findings highlight the emergent character of scope of action. It is obvious that an individual’s scope of action is not being created on one occasion, and above all not only by the IT artifact. Various co- creators such as the IT artifact, the usage and the social context create and re-create scope of action. Also, how the individual interprets and understands the IT artifact in IT usage will influence her scope of action. This since sensemaking and learning processes on both a personal and organizational level take place that are co-creators of the individual’s scope of action, at the same time as the individual’s knowledge and previous sensemaking and learning influences her use of the IT artifact.

    Thus, reasoning, thinking, learning, and the IT artifact co-evolve over time in adaptation and appropriation processes. This means that IT as a mediational means constitutes an important co-creator of scope of action. From this also follows that work integrated learning is an important co- creator of scope of action when using IT in a work setting, at the same time as work integrated learning is being influenced by the individual’s scope of action.

    Finally, in order to understand how scope of action emerges in use, merely focusing on structures is insufficient. Scope of action emerges as a product of interplay between complex processes involving artifacts, usage and context. This means that the user’s scope of action is co-created by both static structures as well as dynamic processes relating to the IT artifact, the organization, and the work practice. Thus, the IT artifact, and subsequently scope of action, must be must be understood in relation to the multi-aspectual context of which it is a part instead of merely in relation to the properties of the IT artifact per se.

  • 37.
    Lundh Snis, Ulrika
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Blast From the Past: When Knowledge Met Computers2002Inngår i: Proceedings of IRIS25, 2002Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The motivation for this paper is driven by the fact that studies on knowledge management tend to be approached in a very generalised, or even, categorised way. The paper outlines the need to understand how knowledge and computers have met before in both research and practice. What lessons might be learned from these previous studies? What is the prevalent understanding of computer supported knowledge management? Are we now ready to acknowledge that computers serve as active tools for knowledge creation and business performance? The paper can be seen as a theoretical contribution to the general discussion of computer support and knowledge management in terms of presenting a historical review of knowledge system generations as well as future implications for research

  • 38.
    Lundh Snis, Ulrika
    et al.
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Barnheim, Bo-Göran
    Semcon Sweden.
    Hattinger, Monika
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Towards a New Design Metaphor: Supporting Boundary Objects as Means of Knowledge Sharing in Community Networks2004Inngår i: ECIS 2004 Proceedings, 2004, artikkel-id 169Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Working in the knowledge sector means dealing with increasing amounts of information, technology and people. Organizations as well as individuals in communities need to constantly maintain large repositories and networks of people, including colleagues, clients, experts, acquaintances and friends. This situation leads to complexity where person’s cognitive capability is insufficient when dealing with huge repositories of information and interaction. Viewing it as an individual problem has resulted in applications that highlight the need for structure and organization. We here define these applications in different levels where the first level is the office application generation, referring to “desktops” metaphors. The next generation, groupware applications, offers structure and process support for collaboration, but is still a rather limited “forum” metaphor. Our main argument is that current application generations and design metaphors are too limited when supporting the sharing of thoughts and associations in different community networks. We believe that a large portion of this problem is not related to information itself, but rather to processes of information categorization, navigation and interaction within and between communities. In our results we advocate the need for a new application generation and a new design metaphor, i.e. brainware applications based on “neural” metaphors. The result is a review of three application generations based on different design metaphors. We discuss several implications for a new design metaphor and suggest a design draft that supports boundary objects as means of knowledge sharing within and between communities.

  • 39.
    Lundh Snis, Ulrika
    et al.
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Gunnarsson, Maj
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Lindroth, Tomas
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Magnusson, Maria
    Högskolan Väst, Institutionen för informatik och matematik (HTU).
    Knowman: To Go Where No Man Has Gone Before2000Inngår i: Proceedings of WebNet World Conference on the WWW and Internet 2000, San Antonio, Texas: Association for the Advancement of Computing in Education (AACE) , 2000, s. 815-816Konferansepaper (Fagfellevurdert)
    Abstract [en]

    IT-support for knowledge work should be designed to support and enhance the human interaction and knowledge sharing processes. The specific usage of web-based technology gives the possibilities of putting crucial, knowledge-related interaction on-line. For example, sharing bookmarks among knowledge workers seems to be a necessary and useful activity. Important and valuable bookmarks often mirror what kind of information and knowledge people are looking for and also what kind of forum they use to go to on the world wide web. In this work we have developed a prototype, KNOWMAN, which manages bookmarks on the world wide web. The prototype is designed as a user-friendly "pad-interface" in which bookmarks can be collaboratively collected, shared and further annotated and explored by other knowledge workers.

  • 40.
    Mark, Emil
    Högskolan Väst, Institutionen för ingenjörsvetenskap.
    Usability: Through the use of guidelines and user participation2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The Department of Engineering Science at University West in Trollhättan was in need of a new system for scheduling personnel, as the existing system is based upon an Excel-file and is hard to work with and does not provide an easy way for the users to collaborate.The purpose of this study was to examine how existing principles and guidelines regarding interface design can be used to create a new web based system with a high usability. The purpose is also to examine how participatory design affects the design process and outcome.To create a system with a high grade of usability, a number of existing rules and guidelines regarding usability and a number of subjects regarding interaction design, were used by the development team as tools.Even though the study showed that usability guidelines can be a valuable tool and provide a good foundation it is important to emphasize the use of other techniques. For example the use of participatory design, which in the study was found to be of great value to the development team.

  • 41.
    Monneret, Denis
    et al.
    Department of Biochemistry and Molecular Biology, South Lyon Hospital Group, Hospices Civils de Lyon (HCL), 165 Chemin du Grand Revoyet, Pierre-Bénite, 69495, France.
    Gellerstedt, Martin
    Högskolan Väst, Institutionen för ekonomi och it, Avd för informatik.
    Roche, Frédéric
    Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, Saint-Etienne, France; EA 4607 SNA-EPIS, PRES Lyon, Saint-Etienne, France .
    Bonnefont-Rousselot, Dominique
    Department of Metabolic Biochemistry, La Pitié Salpêtrière-Charles Foix University Hospital (AP-HP), Paris, France; CNRS UMR8258, INSERM U1022, Faculty of Pharmacy, Sorbonne Paris Cité, Paris Descartes University, Paris, France.
    Outlier removal methods for skewed data: Impact on age-specific high-sensitive cardiac troponin T 99th percentiles2019Inngår i: Clinical Chemistry and Laboratory Medicine, ISSN 1434-6621, E-ISSN 1437-4331, Vol. 57, nr 10, s. E244-E247Artikkel i tidsskrift (Fagfellevurdert)
  • 42.
    Namaki, Nima
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Exhaustion Dominated Performance: Methodology, Tools and Empirical Experiments2008Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 43.
    Namaki, Nima
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    de Blanche, Andreas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    A Tool for Processor Dependency Characterization of HPC Applications2009Inngår i: Proceedings for the HPC Asia & APAN 2009, Hsinchu, Taiwan: National Center for High-Performance Computing , 2009, s. 70-76Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we have implemented and verified Cpugen, a tool for characterization of processor resource utilization of HPC applications .Toward this end we implemented Cpugen, an application with good accuracy for processor load generation. Cpugen was verified through three different phases of passive, active and real world application measurements. The measurement results show that our implemented method is a viable option for non-intrusive, stable and robust load generation. The error range for all generated target loads are between 0.00% minimum and 1.04% maximum, with a median deviation of 0.11%. We can conclude that the method utilized in this investigation provides the ability to generate stable and robust processor load.

  • 44.
    Namaki, Nima
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    de Blanche, Andreas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Exhaustion dominated performance: a first attempt2009Inngår i: SAC '09: Proceedings of the 2009 ACM symposium on Applied Computing, ACM , 2009, s. 1011-1012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we present a first attempt to an analytical method to discover and understand how the available resources influence the execution time. Our method is based on a piecewise linear model for dominating execution limitations and black-box observations. We verify this analysis method by a set of real-world experiments. Finally, we conclude that the different effects follow a linear superposition within a certain range.

  • 45.
    Namaki, Nima
    et al.
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    de Blanche, Andreas
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Mankefors-Christiernin, Stefan
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Exhaustion dominated performance: an empirical method evalutationManuskript (preprint) (Annet vitenskapelig)
  • 46.
    Namaki, Nima
    et al.
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Jiresjö, Christian
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Aspects of Distributed File Systems Considering CPU Performance with Lustre2006Inngår i: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, s. 130-136Konferansepaper (Annet vitenskapelig)
  • 47. Persson, R.
    et al.
    Mankefors Christiernin, Stefan
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Boklund, Andreas
    Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för datavetenskap.
    Concept Model of an Object Detecting Mobile Robot in an Indoor Environment2006Inngår i: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, s. 130-136Konferansepaper (Annet vitenskapelig)
  • 48.
    Spante, Maria
    Högskolan Väst, Institutionen för ekonomi och it, Avd för informatik.
    Talking heads on the internet: social interaction in a multi-user voice based 3d graphical environment2011Inngår i: Proceedings of IRIS 2011.: TUCS Lecture Notes  No 15, October 2011 / [ed] Leino, Timo, 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper reports on the finding from a qualitative study which investigated how long-term

    users of Traveler, a voice-based 3D online graphical environment launched in 1996 and still

    running, experience their social relations in relation to this specific cue-rich communication

    technology. The paper describes the subjective perceptions of the technology-mediated social

    experience such as the experience of social atmosphere in the community, of online

    friendship, of the meaning of the online social interaction in the users' offline lives. The paper

    also discusses the importance of these subjective experiences for motivation to regularly use

    Traveler. Conclusions drawn from the study suggest that it is crucial for users to have the

    ability to handle the technical functions of the program in order to function socially in the

    environment such as using the functions of the graphical program and using the voice channel

    in a social significant way. As a result, in order to have a positive and meaningful social

    experience in online it is critical for users to adapt to technical as well as to social factors.

    This process of adaptation is very important since the way functions are used was interpreted

    as social signals by users suggesting that social and technical aspects are intertwined in social

    practice. The paper describes this process of adaptation and the positive social effects of a

    successful adaptation. 

  • 49.
    Svensson, Ann
    Högskolan Väst, Institutionen för ekonomi och it, Avd för datavetenskap och informatik.
    Instructional-design theories applied on a web-based learning application2008Inngår i: Proceedings - International Conference on Information Technology: New Generations, ITNG 2008,  Fifth International Conference on7-9 April 2008, 2008, s. 845-850Konferansepaper (Annet vitenskapelig)
  • 50.
    Svensson, Bo
    et al.
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Danielsson, Fredrik
    Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för automation och datateknik.
    Improving Performance in Flexible Manufacturing by a P-sop Approach2014Inngår i: Proceedings of the 6th International Swedish Production Symposium 2014 / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper present a Part oriented Sequence of Operation (P-SOP) approach that address flexibility, robustness and deployment in manufacturing cells up to plant level. A P-SOP description language has been formulated where the control strategy based on actual circumstances easily can be defined. Furthermore, a P-SOP multi-agent generator has been created that compiles the strategy description to multi-agents that control the manufacturing. Deadlock free IEC 61131-3 PLC code are directly generated from the description language. The code is not optimised for a specific scenario since the general description contains all possible routing paths and all resources available.

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