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  • 1.
    Amoson, Jonas
    et al.
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Lundqvist, Thomas
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    A light-weigh non-hierarchical file system navigation extension2012In: Proceedings of the 7th International Workshop on Plan 9 / [ed] Eric Jul, Dublin, Ireland, 2012, p. 11-13Conference paper (Other academic)
    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.

  • 2. Andersson, M.
    et al.
    Heldal, R.
    Christiernin, Linn G.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Applying task-based division in multi-layered design: an industrial case study2005In: Human-Computer Interaction 2005: Proceeding of The IASTED International Conference on Human-Computer Interaction (IASTED-HCI)Phoenix, USA, November 14 - 16, 2005, Acta Press , 2005Conference paper (Refereed)
  • 3.
    Asker Zada, Salar
    University West, Department of Economics and 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 credits / 15 HE creditsStudent thesis
    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.

  • 4.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Performance Prediction of Future Generation Computer Systems2006In: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain, Feb 25-28, 2006, p. 42-48Conference paper (Other academic)
  • 5.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Wombat lurar nätskurkarna2006In: Datormagazin, ISSN 1650-1306, no 10, p. 86-90Article in journal (Other (popular science, discussion, etc.))
  • 6.
    Boklund, Andreas
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Johansson, Christer
    Lindell, Håkan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    A Comprative Study of Forward and Reverse Engineering in UML Tools2007In: Proceedings of the International Conference on Applied Computing: Salamanca 2007, Spain, IADIS , 2007, p. 535-540Conference paper (Refereed)
    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.

  • 7. Bäckman, R
    et al.
    Christiernin, Linn G.
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Mankefors-Christiernin, Stefan
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    MIDAS: a process support tool for multi-layered designsIn: Journal of Information Technology Theory and Application, ISSN 1552-6496, E-ISSN 1532-4516Article in journal (Other academic)
  • 8. Calås, G.
    et al.
    Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Robustness Analysis and Technology Forecasting: Survey on a Missing Combination in Software Development2006In: Proceedings of the International conference on Software Engineering :: innsbruck, Austria, 2006, p. 329-334Conference paper (Other academic)
  • 9.
    Calås, Göran
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Mankefors-Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    A First Draft of RATF: A Method Combining Robustness Analysis and Technology Forecasting2006In: Information Technology: New Generations, 2006. ITNG 2006. Third International Conference on, 2006, p. 72-77Conference paper (Other academic)
    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

  • 10.
    Calås, Göran
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Mankefors-Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Combining robust analysis and technology forecasting: A missing combination in contemporary methods2006In: Proceedings of the IASTED International Conference on Software Engineering: as part of the 24th IASTED International Multi-Conference on APPLIED INFORMATICS, Innsbruck, 2006, p. 329-334Conference paper (Other academic)
    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.

  • 11.
    Christiernin Gustafsson, Linn
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Gustavsson, M.
    Ohlsson, A.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Prototyping a Multi-Layered Help - a User Involved Exploratory Design2006In: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, p. 315-323Conference paper (Other academic)
  • 12.
    Christiernin, Linn G.
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Guiding the designer: a radar diagram process for applications with multiple layers2010In: Interacting with computers, ISSN 0953-5438, E-ISSN 1873-7951, Vol. 22, no 2, p. 107-122Article in journal (Refereed)
  • 13.
    Christiernin, Linn G.
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Pros, cons and problems with the MLD concept: M+ a suggestion for the next generation of layered structuresIn: Journal of Computer Science and Technology, ISSN 1000-9000, E-ISSN 1860-4749Article in journal (Refereed)
  • 14.
    Christiernin, Linn G.
    et al.
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Mankefors-Christiernin, Stefan
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Olsson, A
    Boklund, Andreas
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    A case study evaluation of RDPM: a process confirmed successfulIn: Interacting with computers, ISSN 0953-5438, E-ISSN 1873-7951Article in journal (Refereed)
  • 15.
    de Blanche, Andreas
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Operativsystem: teori och praktiskt handhavande2008Book (Other academic)
  • 16.
    de Blanche, Andreas
    et al.
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    Lundqvist, Thomas
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    A methodology for estimating co-scheduling slowdowns due to memory bus contention on multicore nodes2014In: Proceedings of the IASTED International Conference on Parallel and Distributed Computing and Networks, PDCN 2014, ACTA Press, 2014, p. 216-223Conference paper (Refereed)
    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.

  • 17.
    de Blanche, Andreas
    et al.
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    Lundqvist, Thomas
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    Addressing characterization methods for memory contention aware co-scheduling2015In: Journal of Supercomputing, ISSN 0920-8542, E-ISSN 1573-0484, Vol. 71, no 4, p. 1451-1483Article in journal (Refereed)
    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.

  • 18.
    Gustavsson Christiernin, Linn
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Layered design: concepts, case studies and processes - theories and implementations2007Doctoral thesis, comprehensive summary (Other academic)
  • 19.
    Gustavsson Christiernin, Linn
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Erstorp, Ulf
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Magnusson, Staffan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Ångfors, Peter
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Mankefors-Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Easylayer: MLD in an application portal with multiple user groups2007In: Proceedings of the Iadis International Conference Applied Computing 2007: Salamanca, Spain 18-20 February 2007, IADIS , 2007, p. 27-34Conference paper (Other academic)
    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

  • 20.
    Gustavsson Christiernin, Linn
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Lindahl, Fredrik
    Chalmers University of Technology, Sweden.
    Torgersson, Olof
    Chalmers University of Technology, Sweden.
    Designing a multi-layered image viewer2004In: ACM International Conference Proceeding Series Vol 82: proceedings of the third Nordic conference on Human-computer interaction NordiCHI '04 , Tampere, Finland, ACM , 2004, p. 181-184Conference paper (Refereed)
  • 21.
    Haj-Bolouri, Amir
    University West, Department of Economics and IT.
    Semantiska webben och sökmotorer2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report deals with the definitions and terms main purpose has been to investigate how the semantic web affects search engines on the web. This has been done through an investigation consisting of ten different search engines. Nine of these search engines are considering being semantic search engines, and the last one being the most used one on the web today. The study is conducted as a descriptive and quantitative study. A literature review has also been implemented by the relevant sources about the semantic web and search engines. The conclusions drawn where that the semantic web is multifaceted with its definitions and that the result of how concrete search engines implements semantic web principles can vary depending on which search engine one interacts with.

  • 22.
    Igugu Onajite, Johnson
    University West, Department of Engineering Science.
    LAPSync: a Location-Aware Protocol for Remote File Synchronization2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    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

  • 23.
    Jenkins, Samantha
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Kirk, Steven R.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    An investigation of the merging and collapsing of software2007In: Advances in Complex Systems, ISSN 0219-5259, Vol. 10, no 3, p. 379-393Article in journal (Refereed)
    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.

  • 24.
    Jiresjö, Christian
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Benefits of Alternative Network Topologies For COTS Linux Clusters2006In: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, p. 457-461Conference paper (Other academic)
    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.

  • 25.
    Johansson, Daniel
    et al.
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Jibing, Gustav
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Krantz, Johan
    University West, Department of Engineering Science, Division of Automation and Computer Engineering.
    Prestandajämförelse mellan Amazon EC2 och privat datacenter2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    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.

  • 26.
    Johansson, Jim
    University West, Department of Engineering Science.
    Microsoft WebMatrix: Enkelheten i dynamiska webbaserade system2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is based on problematic in an earlier system in which requests have been made to improve the system to a new one. The new system has become to a dynamic web-based system and implemented with the new development tool Microsoft WebMatrix. Microsoft says that developing websites with WebMatrix has never been easier, a statement which is considered as vague.The purpose of the study is to analyze this tool and its new technologies, then result if the statement according to Microsoft is partially true or not, if WebMatrix and its new technologies perceived simple to use. The study also describes the underlying problem and which techniques that have been implemented in the new system using WebMatrix. The purpose of the previously and the new system is service planning of the staff within the organization University West in Trollhättan. The goal is to simplify and improve the service planning.The study and implementation of the system has resulted in that WebMatrix perceived as simple and has a content of useful techniques that contribute to an effective development. The new system which has been created has resulted in being a positive solution which is simplifying service planning. The system contains only functionality that is relevant, have a better overview and a structure that makes it easier to administer. Unlike the previous system data is stored in a database, which has contributed to a very positive impression of the system's users, given the common availability.

  • 27.
    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
    University West, Department of Engineering Science, Division of Production Systems.
    Fast-Berglund, Åsa
    Chalmers University of Technology, Gothenburg 412 96, Sweden.
    Moestam, Lena
    Data and Information Handling in Assembly Information Systems: A Current State Analysis2017In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 11, p. 2099-2106Article in journal (Refereed)
    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

  • 28.
    Köhler, Veronica
    University West, Department of Nursing, Health and Culture.
    Co-Creators of Scope of Action: An exploration of the dynamic relationship between people, IT, and work in a nursing context2006Licentiate thesis, monograph (Other academic)
    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.

  • 29.
    Mark, Emil
    University West, Department of Engineering Science.
    Usability: Through the use of guidelines and user participation2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    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.

  • 30.
    Namaki, Nima
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Exhaustion Dominated Performance: Methodology, Tools and Empirical Experiments2008Licentiate thesis, comprehensive summary (Other academic)
  • 31.
    Namaki, Nima
    et al.
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    de Blanche, Andreas
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Mankefors-Christiernin, Stefan
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    A Tool for Processor Dependency Characterization of HPC Applications2009In: Proceedings for the HPC Asia & APAN 2009, Hsinchu, Taiwan: National Center for High-Performance Computing , 2009, p. 70-76Conference paper (Refereed)
    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.

  • 32.
    Namaki, Nima
    et al.
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    de Blanche, Andreas
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Mankefors-Christiernin, Stefan
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Exhaustion dominated performance: a first attempt2009In: SAC '09: Proceedings of the 2009 ACM symposium on Applied Computing, ACM , 2009, p. 1011-1012Conference paper (Refereed)
    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.

  • 33.
    Namaki, Nima
    et al.
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    de Blanche, Andreas
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Mankefors-Christiernin, Stefan
    University West, School of Business, Economics and IT, Division of Computer Science and Informatics.
    Exhaustion dominated performance: an empirical method evalutationManuscript (preprint) (Other academic)
  • 34.
    Namaki, Nima
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Jiresjö, Christian
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Aspects of Distributed File Systems Considering CPU Performance with Lustre2006In: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, p. 130-136Conference paper (Other academic)
  • 35. Persson, R.
    et al.
    Mankefors Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Boklund, Andreas
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Concept Model of an Object Detecting Mobile Robot in an Indoor Environment2006In: Proceedings of the International Conference on Applied Computing: San Sebastian, Spain. Feb 25-28, 2006, p. 130-136Conference paper (Other academic)
  • 36.
    Svensson, Ann
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Instructional-design theories applied on a web-based learning application2008In: Proceedings - International Conference on Information Technology: New Generations, ITNG 2008,  Fifth International Conference on7-9 April 2008, 2008, p. 845-850Conference paper (Other academic)
  • 37.
    Svensson, Bo
    et al.
    University West, Department of Engineering Science, Division of Automation Systems.
    Danielsson, Fredrik
    University West, Department of Engineering Science, Division of Automation Systems.
    P-SOP -€“ A multi-agent based control approach for flexible and robust manufacturing2015In: Robotics and Computer-Integrated Manufacturing, ISSN 0736-5845, E-ISSN 1879-2537, Vol. 36, p. 109-118, article id 1301Article in journal (Refereed)
    Abstract [en]

    In a truly flexible manufacturing system the description of the control strategy must be updated every day. Hence, a new way to handle changes in the environment down to control system deployment and production is required. This paper presents a novel approach, based on P-SOP, to handle multi-agent based control and verification. The P-SOP approach addresses flexibility, robustness and deployment in the best possible manner with the least waste of time and effort. P-SOP includes a description language where the control strategy based on actual circumstances easily can be defined. Based on the description multi-agents, to control the manufacturing, are automatically generated. An industrial advantage is that the multi-agent generator creates IEC 61131-3 PLC code that can be executed on standard PLC’s. This feature eliminates the need for experts in PLC programming and reduce deployment time to become more efficient. Hence, this flexibility enables small series down to one off production in a competitive way. With multi-agent control it is also possible to handle rebalancing due to market changes, scheduling of available humans, introduction of new part types, and rerouting due to a machine break down or planned service. The generated agents are not optimised for a final solution with specific timings. All decisions are made on-line and the generated solution adapts to the circumstances that arise. With the P-SOP multi-agents it is easy to manually remove or introduce parts to the manufacturing cell without disturbing the system, e.g. for manually random inspections, removal of parts due to restart. The formulated description language and the multi-agent generator has been successfully tested and evaluated in an industrial environment.

  • 38.
    Svensson, M
    et al.
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Ydenius, A
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Christiernin, Linn
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    Christiernin, Stefan
    University West, Department of Economics and IT, Division of Computer Science and Informatics.
    UML: How to model user interfaces - An exploratory study2009In: Proceedings of the IADIS International Conference Informatics 2009, Part of the IADIS Multi Conference on Computer Science and Information Systems, MCCSIS 2009, Algarve, 2009, p. 59-66Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    When creating software, people from many different areas are involved. To make them work efficiently together they need to communicate but communication requires a common language and common understanding. The Unified Modeling Language (UML) is often used as a common ground for understanding when modeling and designing software products. However, after practically working with many large projects we have found UML to have shortcomings in the area of modeling Graphical User Interface (GUI). There are many other ways to model GUIs but it could be beneficial to use a modeling method that the more technical developers are familiar with and also beneficial to be able to put in the interface into the framework of UML when it comes to drawing applications and code generation. In this study we first of all have investigated the possibility of adding GUI design to UML and then we have explored different solutions for what a GUI UML-diagram could look like and what problems there are with diagrams when it comes to visualizing objects. We have then put forward an idea for a GUI diagram or an UML extension; a graphical element diagram, and discussed its benefits and drawbacks. © 2009 IADIS.

  • 39. Torkar, Richard
    et al.
    Mankefors-Christiernin, Stefan
    University West, Department of Technology, Mathematics and Computer Science, Division for Computer Science.
    Combining partition and random testing2006In: Proceedings of the IASTED International Conference on Software Engineering, as part of the 24th IASTED International Multi-Conference on APPLIED INFORMATICS, Innsbruck, 2006, p. 367-372Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    In this paper we evaluate the potential in combining different testing methodologies. The evaluation indicates an increase in effectiveness when adding random testing to partition testing. At the same time, the increase in efficiency inevitably fades because of the added number of random test cases being executed. Nevertheless, the potential in an automation scheme for creating and executing test cases is visible, thus indicating that a future implementation combining the best of two worlds, i.e. partition and random testing could be pursued.

  • 40.
    Yan Lin, Wu
    University West, Department of Economics and IT.
    A Lightweight Framework for Tracing andVisualizing Real-Time Operating Systems2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    System tracing is a helpful method for engineersand users to know exactly what happens in an operating system,especially in real-time operating systems (RTOS), because forreal-time system, it is normally more difficult to know theperformance of hardware and software than for desktopcomputers. Although this kind of tracing tools already exist forsome commercial RTOS, it is fairly hard to see those tools forsmall or open source RTOS. Moreover, because the structure andimplementation of different RTOS varies, it is rare to find aframework that can easily be ported to those platforms. In thisthesis, a solution is presented to this general tracing problem ondifferent platforms. By using the portable framework, it ispossible to implement tracing component into a real timeoperating system by some simple reconfigurations. This platformportability feature is accomplished by separating the specificplatform logic from the logic of the tracing part. Finally, adeployment of this framwork onto a small open source real-timeoperating system—AtomThreads, running on an AVRATmega1650 – is used as a demonstration of this framework.

1 - 40 of 40
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