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  • 1.
    Abbas, Nadeem
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Designing Self-Adaptive Software Systems with Reuse2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Modern software systems are increasingly more connected, pervasive, and dynamic, as such, they are subject to more runtime variations than legacy systems. Runtime variations affect system properties, such as performance and availability. The variations are difficult to anticipate and thus mitigate in the system design.

    Self-adaptive software systems were proposed as a solution to monitor and adapt systems in response to runtime variations. Research has established a vast body of knowledge on engineering self-adaptive systems. However, there is a lack of systematic process support that leverages such engineering knowledge and provides for systematic reuse for self-adaptive systems development. 

    This thesis proposes the Autonomic Software Product Lines (ASPL), which is a strategy for developing self-adaptive software systems with systematic reuse. The strategy exploits the separation of a managed and a managing subsystem and describes three steps that transform and integrate a domain-independent managing system platform into a domain-specific software product line for self-adaptive software systems.

    Applying the ASPL strategy is however not straightforward as it involves challenges related to variability and uncertainty. We analyzed variability and uncertainty to understand their causes and effects. Based on the results, we developed the Autonomic Software Product Lines engineering (ASPLe) methodology, which provides process support for the ASPL strategy. The ASPLe has three processes, 1) ASPL Domain Engineering, 2) Specialization and 3) Integration. Each process maps to one of the steps in the ASPL strategy and defines roles, work-products, activities, and workflows for requirements, design, implementation, and testing. The focus of this thesis is on requirements and design.

    We validate the ASPLe through demonstration and evaluation. We developed three demonstrator product lines using the ASPLe. We also conducted an extensive case study to evaluate key design activities in the ASPLe with experiments, questionnaires, and interviews. The results show a statistically significant increase in quality and reuse levels for self-adaptive software systems designed using the ASPLe compared to current engineering practices.

  • 2.
    Abbas, Nadeem
    Umeå universitet.
    Properites of "Good" Java Examples2010Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Example programs are well known as an important tool to learn computer programming. Realizing the signicance of example programs, this study has been conducted with a goalto measure and evaluate the quality of examples used in academia. We make a distinctionbetween good and bad examples, as badly designed examples may prove harmful for novice learners. In general, students differ from expert programmers in their approach to read and comprehend a program. How do students understand example programs is explored in the light of classical theories and models of program comprehension. Key factors that impact program quality and comprehension are identified. To evaluate as well as improve the quality of examples, a set of quality attributes is proposed. Relationship between program complexity and quality is examined. We rate readability as a prime quality attribute and hypothesize that example programs with low readability are difficult to understand. Software Reading Ease Score (SRES), a program readability metric proposed by Börstler et al. is implemented to provide a readability measurement tool. SRES is based on lexical tokens and is easy to compute using static code analysis techniques. To validate SRES metric, results are statistically analyzed in correlation to earlier existing well acknowledged software metrics.

  • 3.
    Abbas, Nadeem
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Towards autonomic software product lines2011Ingår i: SPLC '11 Proceedings of the 15th International Software Product Line Conference, Volume 2, ACM Press, 2011, s. 44:1-44:8Konferensbidrag (Refereegranskat)
    Abstract [en]

    We envision an Autonomic Software Product Line (ASPL). The ASPL is a dynamic software product line that supports self adaptable products. We plan to use reflective architecture to model and develop ASPL. To evaluate the approach, we have implemented three autonomic product lines which show promising results. The ASPL approach is at initial stages, and require additional work. We plan to exploit online learning to realize more dynamic software product lines to cope with the problem of product line evolution. We propose on-line knowledge sharing among products in a product line to achieve continuous improvement of quality in product line products.

  • 4.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Architectural reasoning for dynamic software product lines2013Ingår i: Proceedings of the 17th International Software Product Line Conference co-located workshops, ACM Press, 2013, s. 117-124Konferensbidrag (Refereegranskat)
    Abstract [en]

    Software quality is critical in today's software systems. A challenge is the trade-off situation architects face in the design process. Designers often have two or more alternatives, which must be compared and put into context before a decision is made. The challenge becomes even more complex for dynamic software product lines, where domain designers have to take runtime variations into consideration as well. To address the problem we propose extensions to an architectural reasoning framework with constructs/artifacts to define and model a domain's scope and dynamic variability. The extended reasoning framework encapsulates knowledge to understand and reason about domain quality behavior and self-adaptation as a primary variability mechanism. The framework is demonstrated for a self-configuration property, self-upgradability on an educational product-line.

  • 5.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
    Architectural Reasoning Support for Product-Lines of Self-adaptive Software Systems: A Case Study2015Ingår i: Software Architecture: 9th European Conference, ECSA 2015, Dubrovnik/Cavtat, Croatia, September 7-11, 201 / [ed] Danny Weyns, Raffaela Mirandola, Ivica Crnkovic, Springer, 2015, s. 20-36Konferensbidrag (Refereegranskat)
    Abstract [en]

    Software architecture serves as a foundation for the design and development of software systems. Designing an architecture requires extensive analysis and reasoning. The study presented herein focuses on the architectural analysis and reasoning in support of engineering self-adaptive software systems with systematic reuse. Designing self-adaptive software systems with systematic reuse introduces variability along three dimensions; adding more complexity to the architectural analysis and reasoning process. To this end, the study presents an extended Architectural Reasoning Framework with dedicated reasoning support for self-adaptive systems and reuse. To evaluate the proposed framework, we conducted an initial feasibility case study, which concludes that the proposed framework assists the domain architects to increase reusability, reduce fault density, and eliminate differences in skills and experiences among architects, which were our research goals and are decisive factors for a system's overall quality.

  • 6.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM), Institutionen för datavetenskap (DV).
    ASPLe: a methodology to develop self-adaptive software systems with reuse2017Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Advances in computing technologies are pushing software systems and their operating environments to become more dynamic and complex. The growing complexity of software systems coupled with uncertainties induced by runtime variations leads to challenges in software analysis and design. Self-Adaptive Software Systems (SASS) have been proposed as a solution to address design time complexity and uncertainty by adapting software systems at runtime. A vast body of knowledge on engineering self-adaptive software systems has been established. However, to the best of our knowledge, no or little work has considered systematic reuse of this knowledge. To that end, this study contributes an Autonomic Software Product Lines engineering (ASPLe) methodology. The ASPLe is based on a multi-product lines strategy which leverages systematic reuse through separation of application and adaptation logic. It provides developers with repeatable process support to design and develop self-adaptive software systems with reuse across several application domains. The methodology is composed of three core processes, and each process is organized for requirements, design, implementation, and testing activities. To exemplify and demonstrate the use of the ASPLe methodology, three application domains are used as running examples throughout the report.

  • 7.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Harnessing Variability in Product-lines of Self-adaptive Software Systems2015Ingår i: Proceedings of the 19th International Conference on Software Product Line: SPLC '15, ACM Press, 2015, s. 191-200Konferensbidrag (Refereegranskat)
    Abstract [en]

    This work studies systematic reuse in the context of self-adaptive software systems. In our work, we realized that managing variability for such platforms is different compared to traditional platforms, primarily due to the run-time variability and system uncertainties. Motivated by the fact that recent trends show that self-adaptation will be used more often in future system generation and that software reuse state-of-practice or research do not provide sufficient support, we have investigated the problems and possibly resolutions in this context. We have analyzed variability for these systems, using a systematic reuse prism, and identified a research gap in variability management. The analysis divides variability handling into four activities: (1) identify variability, (2) constrain variability, (3) implement variability, and (4) manage variability. Based on the findings we envision a reuse framework for the specific domain and present an example framework that addresses some of the identified challenges. We argue that it provides basic support for engineering self-adaptive software systems with systematic reuse. We discuss some important avenues of research for achieving the vision.

  • 8.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Iftikhar, Muhammad Usman
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Weyns, Danny
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Rigorous architectural reasoning for self-adaptive software systems2016Ingår i: Proceedings: First Workshop on Qualitative Reasoning abut Software Architectures, QRASA 2016 / [ed] Lisa O'Conner, IEEE, 2016, s. 11-18Konferensbidrag (Refereegranskat)
    Abstract [en]

    Designing a software architecture requires architectural reasoning, i.e., activities that translate requirements to an architecture solution. Architectural reasoning is particularly challenging in the design of product-lines of self-adaptive systems, which involve variability both at development time and runtime. In previous work we developed an extended Architectural Reasoning Framework (eARF) to address this challenge. However, evaluation of the eARF showed that the framework lacked support for rigorous reasoning, ensuring that the design complies to the requirements. In this paper, we introduce an analytical framework that enhances eARF with such support. The framework defines a set of artifacts and a series of activities. Artifacts include templates to specify domain quality attribute scenarios, concrete models, and properties. The activities support architects with transforming requirement scenarios to architecture models that comply to required properties. Our focus in this paper is on architectural reasoning support for a single product instance. We illustrate the benefits of the approach by applying it to an example client-server system, and outline challenges for future work. © 2016 IEEE.

  • 9.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Andersson, Jesper
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Löwe, Welf
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Autonomic Software Product Lines (ASPL)2010Ingår i: ECSA '10 Proceedings of the Fourth European Conference on Software Architecture: Companion Volume / [ed] Carlos E. Cuesta, ACM Press, 2010, s. 324-331Konferensbidrag (Refereegranskat)
    Abstract [en]

    We describe ongoing work on a variability mechanism for Autonomic Software Product Lines (ASPL). The autonomic software product lines have self-management characteristics that make product line instances more resilient to context changes and some aspects of product line evolution. Instances sense the context, selects and bind the best component variants to variation-points at run-time. The variability mechanism we describe is composed of a profile guided dispatch based on off-line and on-line training processes. Together they form a simple, yet powerful variability mechanism that continuously learns, which variants to bind given the current context and system goals.

  • 10.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Andersson, Jesper
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Löwe, Welf
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Towards Autonomic Software Product Lines (ASPL) - A Technical Report2011Rapport (Övrigt vetenskapligt)
    Abstract [en]

    This report describes a work in progress to develop Autonomic Software Product Lines (ASPL). The ASPL is a dynamic software product line approach with a novel variability handling mechanism that enables traditional software product lines to adapt themselves at runtime in response to changes in their context, requirements and business goals. The ASPL variability mechanism is composed of three key activities: 1) context-profiling, 2) context-aware composition, and 3) online learning. Context-profiling is an offline activity that prepares a knowledge base for context-aware composition. The context-aware composition uses the knowledge base to derive a new product or adapts an existing product based on a product line's context attributes and goals. The online learning optimizes the knowledge base to remove errors and suboptimal information and to incorporate new knowledge. The three activities together form a simple yet powerful variability handling mechanism that learns and adapts a system at runtime in response to changes in system context and goals. We evaluated the ASPL variability mechanism on three small-scale software product lines and got promising results. The ASPL approach is, however, is yet at an initial stage and require improved development support with more rigorous evaluation. 

  • 11.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Andersson, Jesper
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Weyns, Danny
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    ASPLe: a methodology to develop self-adaptive software systems with systematic reuseManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    More than two decades of research have demonstrated an increasing need for software systems to be self-adaptive. Self-adaptation is required to deal with runtime dynamics which are difficult to predict before deployment. A vast body of knowledge to develop Self-Adaptive Software Systems (SASS) has been established. We, however, discovered a lack of process support to develop self-adaptive systems with reuse. To that end, we propose a domain-engineering based methodology, Autonomic Software Product Lines engineering (ASPLe), which provides step-by-step guidelines for developing families of SASS with systematic reuse. The evaluation results from a case study show positive effects on quality and reuse for self-adaptive systems designed using the ASPLe compared to state-of-the-art engineering practices.

  • 12.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Andersson, Jesper
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Weyns, Danny
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Knowledge evolution in autonomic software product lines2011Ingår i: SPLC '11 Proceedings of the 15th International Software Product Line Conference, Volume 2, New York, NY, USA: ACM Press, 2011, s. 36:1-36:8Konferensbidrag (Refereegranskat)
    Abstract [en]

    We describe ongoing work in knowledge evolution management for autonomic software product lines. We explore how an autonomic product line may benefit from new knowledge originating from different source activities and artifacts at run time. The motivation for sharing run-time knowledge is that products may self-optimize at run time and thus improve quality faster compared to traditional software product line evolution. We propose two mechanisms that support knowledge evolution in product lines: online learning and knowledge sharing. We describe two basic scenarios for runtime knowledge evolution that involves these mechanisms. We evaluate online learning and knowledge sharing in a small product line setting that shows promising results.

  • 13.
    Abbas, Nadeem
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Andersson, Jesper
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Weyns, Danny
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Modeling Variability in Product Lines Using Domain Quality Attribute Scenarios2012Ingår i: Proceedings of the WICSA/ECSA 2012 Companion Volume, ACM Press, 2012, s. 135-142Konferensbidrag (Refereegranskat)
    Abstract [en]

    The concept of variability is fundamental in software product lines and a successful implementation of a product line largely depends on how well domain requirements and their variability are specified, managed, and realized. While developing an educational software product line, we identified a lack of support to specify variability in quality concerns. To address this problem we propose an approach to model variability in quality concerns, which is an extension of quality attribute scenarios. In particular, we propose domain quality attribute scenarios, which extend standard quality attribute scenarios with additional information to support specification of variability and deriving product specific scenarios. We demonstrate the approach with scenarios for robustness and upgradability requirements in the educational software product line.

  • 14.
    Abdeljaber, Osama
    et al.
    Qatar University, Qatar.
    Avci, Onur
    Qatar University, Qatar.
    Kiranyaz, Serkan
    Qatar University, Qatar.
    Boashash, Boualem
    Qatar University, Qatar; The University of Queensland, Herston, Australia.
    Sodano, Henry
    University of Michigan, USA.
    Inman, Daniel
    University of Michigan, USA.
    1-D CNNs for structural damage detection: verification on a structural health monitoring benchmark data2018Ingår i: Neurocomputing, ISSN 0925-2312, E-ISSN 1872-8286, Vol. 275, s. 1308-1317Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Structural damage detection has been an interdisciplinary area of interest for various engineering fields. While the available damage detection methods have been in the process of adapting machine learning concepts, most machine learning based methods extract “hand-crafted” features which are fixed and manually selected in advance. Their performance varies significantly among various patterns of data depending on the particular structure under analysis. Convolutional neural networks (CNNs), on the other hand, can fuse and simultaneously optimize two major sets of an assessment task (feature extraction and classification) into a single learning block during the training phase. This ability not only provides an improved classification performance but also yields a superior computational efficiency. 1D CNNs have recently achieved state-of-the-art performance in vibration-based structural damage detection; however, it has been reported that the training of the CNNs requires significant amount of measurements especially in large structures. In order to overcome this limitation, this paper presents an enhanced CNN-based approach that requires only two measurement sets regardless of the size of the structure. This approach is verified using the experimental data of the Phase II benchmark problem of structural health monitoring which had been introduced by IASC-ASCE Structural Health Monitoring Task Group. As a result, it is shown that the enhanced CNN-based approach successfully estimated the actual amount of damage for the nine damage scenarios of the benchmark study.

  • 15.
    Abdiju, Kushtrim
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Exploring a New Way of Food Inventory Management in Households Using Modern Technologies to Reduce Food Waste2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Food waste is becoming an increasing threat to the environment and the economy. Estimates indicate that annually, a third of the food produced around the world ends up being wasted. Only one-fourth of that food is enough to take nearly a billion people out of starvation. Food waste is especially higher in more developed countries, including most of the states in the European Union and the USA. Sector-wise, food is being lost from field to fork, with households topping the charts. Overbuying, not knowing what already is in the fridge, unaware of the food until it eventually expires, are among the most common reasons that contribute to the food waste. The potential prevention of such massive waste could significantly reduce the amount of greenhouse gas emissions around the world and help the economy of the households including all the parties involved in food production, distributing and retailing.

    On the other hand, technology has progressed in very rapid steps. The advancement of AI, ML, IoT, and voice-enabled devices has revolutionized many industries and has made us more efficient as human beings. Unfortunately, these advancements haven't yet had any significant impact in assisting families with their food choices and in preventing them from overbuying and throwing food away. Most of the proposed solutions addressing this issue, do not get integrated into everyday life. That is because they require a lot of manual input, rely entirely on mobile phones, do not show immediate results to keep users motivated, and on top of all, for the sole fact that modern lives are quite complex, and although an important issue, food waste is not an everyday cause of concern of an average person.

    This thesis takes into account all of the shortcomings of the previous works and aims to create a more sustainable solution by exploring new ways of food inventory management in the households by automating the process so that users don't have to manually enter the data themselves. The proposed solution consists of a device that should be easily mounted into any fridge and acts as an interface between users and their food inventory. The device contains a bar-code scanner for the item input and a back-end that is capable of recognizing the item and can in return show user-friendly and valuable information such as the approximate price of the item, the approximate due date etc. and notifies users when an item is about to expire so that they can take appropriate actions.

    7 out of 9 participants in the final conceptual design study said they would use this solution in their homes. The rest of the results from the designed test cases indicate a clear excitement and interest in participants and a willingness to see the prototype in the finished state, all the comments and insights together with the future work and how the feedback will be used into the next iteration are part of the final discussion of this thesis.

  • 16.
    Abdullahi, Abdille
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Component-based Software development2008Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

    Component-based Software development is a promising way to improve quality, time to market and handle the increasing complexity of software management. However, The component-based development is still a process with many problems, it is not well de_ned either from theoretical or practical point of view. This thesis gives a brief overview of Component-Based Software development and starts with brief historical evolution followed by a general explanation of the method. A detailed discussion of the underlying principles like components, component framework and compent system architecture are then presented. Some real world component stadards such as .net framework, CORBA CCM and EJB are given in detail. Finally, simple fille-sharing-program based on Apache's Avalon framework and another one based on .net framework are developed as a case study.

  • 17.
    Abdulrazak Kadhim, Duaa
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Improving Electronic Health Records for Non-Swedish Speaking Refugees: A Qualitative Case Study2018Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Abstract

    Information and communication technology is used in healthcare in Sweden to improve health quality. Electronic Health Records are one of the technologies in healthcare which can increase a patient’s involvement in his/her healthcare and decision-making related to it. The patient can discuss the treatments, analyses and medical information stored in Electronic Health Records. The aim in this study is to investigate how the Electronics Health Records can be improved to motivate refugees in Sweden who cannot speak Swedish. This research is a qualitative interpretive case study. The methods used in this study are observation and interviews. Thematic analysis was used for data analysis. The findings show that refugees don’t receive information or instructions about how to use electronic health records properly. The language is the biggest hurdle to use electronic health records for refugee patients without knowing Swedish language. The findings further show that the electronic health records can be improved by adding sound or translated medical information in the diagnosis part of the electronic health record. This research might contribute to the healthcare process of any country in the world which has refugees and they use electronic health records.

     

  • 18.
    Abrahamsson, Claes
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Videokompression och användarnytta2007Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    Digital video är ett område som expanderat kraftigt senaste åren. På grund av avancerade videokompressionsmetoder kan numera en hel långfilm rymmas på mobiltelefonen eller den handhållna videospelaren. Men hur fungerar videokompression och hur hårt kan man komprimera en viss filmsekvens med bibehållen användarnytta? I denna uppsats görs en genomgång för grunderna inom videokompression. Dess förhållande till användarnyttan undersöks genom ett experiment. I detta experiment testas tre videosekvenser komprimerade med tre olika kodekar i tre olika datahastigheter för tre olika experimentgrupper. Slutsatsen av

    denna studie är att det är svårt att hitta en exakt brytpunkt där användaren finner videokvaliteten oacceptabel. Dock kan det konstateras att den högsta datahastigheten(256 kbit/s) genererar hög användarnytta medan den lägsta datahastigheten genererar låg användarnytta. Mellanhastigheten 128 kbit/s får knappt godkänt av testpersonerna.

  • 19.
    Abrahamsson, Jimmy
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Nätverksoptimering: Bästa möjliga tillgänglighet till lägsta möjliga länkkostnad2012Självständigt arbete på grundnivå (högskoleexamen), 5 poäng / 7,5 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna uppsats behandlar nätverksoptimering, med fokus på att få fram den bästa möjliga tillgängligheten till lägsta möjliga kostnad, i form av länkar. I studien tas en teoretiskt grundad hypotes om en metod fram för att lösa detta problemet. Samt genomförs ett test där metoden appliceras på ett studieobjekt för att bekräfta huruvida metoden verkar fungerar eller inte.

    Resultatet blir slutligen en metod som genom att analysera tillgängligheten, länk redundansen samt beräkna antal oberoende vägar mellan noder i ett nätverk. Kan genom att jämföra resultat från före en förändring med resultat från efter en förändring lyfta fram de förändringar som medför förbättringar. Varpå ett nätverk kan optimeras till bästa möjliga tillgänglighet till lägsta möjliga kostnad, i form av länkar.

  • 20.
    Achilleos, Achilleas
    et al.
    Frederick University, Cyprus.
    Mettouris, Christos
    University of Cyprus, Cyprus.
    Yeratziotis, Alexandros
    University of Cyprus, Cyprus.
    Papadopoulos, George
    University of Cyprus, Cyprus.
    Pllana, Sabri
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Huber, Florian
    SYNYO GmbH, Austria.
    Jäger, Bernhard
    SYNYO GmbH, Austria.
    Leitner, Peter
    SYNYO GmbH, Austria.
    Ocsovszky, Zsófia
    BioTalentum Ltd, Hungary.
    Dinnyés, András
    BioTalentum Ltd, Hungary.
    SciChallenge: A Social Media Aware Platform for Contest-Based STEM Education and Motivation of Young Students2019Ingår i: IEEE Transactions on Learning Technologies, ISSN 1939-1382, E-ISSN 1939-1382, Vol. 12, nr 1, s. 98-111Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Scientific and technological innovations have become increasingly important as we face the benefits and challenges of both globalization and a knowledge-based economy. Still, enrolment rates in STEM degrees are low in many European countries and consequently there is a lack of adequately educated workforce in industries. We believe that this can be mainly attributed to pedagogical issues, such as the lack of engaging hands-on activities utilized for science and math education in middle and high schools. In this paper, we report our work in the SciChallenge European project, which aims at increasing the interest of pre-university students in STEM disciplines, through its distinguishing feature, the systematic use of social media for providing and evaluation of the student-generated content. A social media-aware contest and platform were thus developed and tested in a pan-European contest that attracted >700 participants. The statistical analysis and results revealed that the platform and contest positively influenced participants STEM learning and motivation, while only the gender factor for the younger study group appeared to affect the outcomes (confidence level – p<.05).

  • 21.
    Adamou, Sofia
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Ntoka, Lamprini
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    The impact of Digital Technologies on Academic Libraries: a study in Greece2017Självständigt arbete på avancerad nivå (masterexamen), 80 poäng / 120 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Purpose: This study explores both library users’ and librarians’ experiences, benefits, and challenges depending on the implementation of digital technologies in academic libraries. The research has been taken place in two Greek academic libraries; In the Panteion University Library and in the Central Library of T.E.I. of Athens.Approach: Two research questions were developed for this research to be conducted and a sample size of 55 respondents (39 library users and 16 librarians) of the Panteion University Library and Central Library of T.E.I. of Athens, was evaluated.Findings: From the findings of the study, it was concluded that the general perception of both library users and librarians towards digital material and E-resources and services of the Panteion University Library and Central Library of T.E.I. of Athens, is satisfactory. Library users were satisfied with the convenience of digital material, the availability of E-resources provided by both academic libraries such as World Wide Web, WIFI, and online databases. They were not satisfied with library technology (i.e., computers) and library staff. Besides, results showed that services such as e-mail and Open Public Access Catalogue were used more often. Librarians were less satisfied with the digital library system, the limited personnel, and the financial funds for academic libraries in general.Implication: The results of this research have implications in the stakeholders of an academic library including the institutional management, the library administration, the librarians, the library users, the researchers, the community at large, and others.Value: This paper identifies critical issues related to the utilization of digital technologies and digital material; their benefits and challenges faced by librarians and library users as well as their effective operation from academic libraries in this information age.

  • 22.
    Adebayo, Stephen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Perceived impacts of Cloud Computing adoption on the role of an IT department of a higher institution in a developing country.2019Självständigt arbete på avancerad nivå (magisterexamen), 40 poäng / 60 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Cloud computing popularity has continued to be on the increase side, and it has been significant contributory factor to the of 24/7 365 days business culture of the digital 21st century where data and data centers are accessed via the internet through any connected device, anytime and from anywhere. Higher Education Institutions (HEI) or Tertiary Education Institution (TEI) are also among organisations, medium and large, that are tapping into this trend by gradually adopting this technology to reduce their high budgets in the prevailing face of financial shortage. This has particularly made the technology attractive to TEI in developing countries, and more of them are adopting the services being offered by cloud computing. The adoption of this technology however, affects the way and manner by which IT services are being delivered traditionally by the TEI IT or ICT departments. The objective of this study therefore, is to explore the adoption of this phenomenal technology and its impact on the role of traditional IT department in one of the tertiary education institution in the South Western part of Nigeria. The TOE framework adoption model was used to explore the adoption factors, and interviews conducted within the ICT department of the institution as part of the empirical findings process. In contrary to popular belief, no member of the IT staff has lost his or her job yet based on the adoption despite the impact on the skills and culture in service delivery of the department. IT staffs were encouraged to adapt to the change as quickly as possible with trainings given, and the ICT, thus the HEI have value added as most of the services are now available on a 24-hour basis to users, even while off campus and far remote, a dream very difficult and near impossible in the days of full traditional IT services delivery.

  • 23.
    Adegoke, Adekunle
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Osimosu, Emmanuel
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV).
    Service Availability in Cloud Computing: Threats and Best Practices2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Cloud computing provides access to on-demand computing resources and storage space, whereby applications and data are hosted with data centers managed by third parties, on a pay-per-use price model. This allows organizations to focus on core business goals instead of managing in-house IT infrastructure.                    

    However, as more business critical applications and data are moved to the cloud, service availability is becoming a growing concern. A number of recent cloud service disruptions have questioned the reliability of cloud environments to host business critical applications and data. The impact of these disruptions varies, but, in most cases, there are financial losses and damaged reputation among consumers.        

    This thesis aims to investigate the threats to service availability in cloud computing and to provide some best practices to mitigate some of these threats. As a result, we identified eight categories of threats. They include, in no particular order: power outage, hardware failure, cyber-attack, configuration error, software bug, human error, administrative or legal dispute and network dependency. A number of systematic mitigation techniques to ensure constant availability of service by cloud providers were identified. In addition, practices that can be applied by cloud customers and users of cloud services, to improve service availability were presented.

  • 24.
    Adriansson, Eva
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Kommunal verksamhetsprocess efter införandet av en e-tjänst: Informationsflöde och informationshantering sett ur ett Lean-perspektiv2011Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Trots de svenska medborgarnas ökande krav på digital självservice via e-tjänster, går införande trögt hos kommunerna. En anledning är den relativt låga kunskap som finns i området. Främst vad gäller avancerade e-tjänster som förutom att öka medborgarnas tillgänglighet, insyn och delaktighet i sina offentliga ärenden, även ska minska den administrativa hanteringen för att istället låta mer av resurserna gå till kärnverksamheten. I den här kvalitativa fallstudien studerades hur en kommunal verksamhetsprocess utvecklas vid införandet av en e-tjänst. Hur slöseri kan identifieras i processen informationshantering och informationsflöde och hur dessa förändrats efter att e-tjänsten införts. Resultatet baserades på material från intervjuer och analyserades utifrån Leans kategorier av slöseri och teorin om Microsystem. Resultatet visade att slöseri som uppstår i informationshantering och informationsflöde mellan enheter eller microsystem kunde identifieras om alla microsystem kartlägger processen tillsammans. Mycket slöseri hade tagits bort i utvecklingsarbetet och lett till en smidigare och troligtvis mer effektiv process. Ett antagande men som även bekräftades av personalens upplevelser från testförsöken. Processutvecklingen tillsammans med e-tjänsten har säkerställt delar av processflödet där antalet informationsöverföringar blivit färre och på så sätt troligtvis även minskat risken för att missförstånd och felhantering ska uppstå av informationshanteringen.

  • 25.
    Afyounian, Ebrahim
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Information and Communication Technologies in Support of Remembering: A Postphenomenological Study2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis aimed to study the everyday use of ICT-enabled memory aids in order to understand and to describe the technological mediations that are brought by them (i.e. how they shape/mediate experiences and actions of their users). To do this, a post-phenomenological approach was appropriated. Postphenomenology is a modified, hybrid phenomenology that tries to overcome the limitations of phenomenology. As for theoretical framework, ‘Technological Mediation’ was adopted to conduct the study. Technological Mediation as a theory provides concepts suitable for explorations of the phenomenon of human-technology relation.

    It was believed that this specific choice of approach and theoretical framework would provide a new way of exploring the use of concrete technologies in everyday life of human beings and the implications that this use might have on humans’ lives. The study was conducted in the city of Växjö, Sweden. Data was collected by conducting twelve face-to-face semi-structured interviews. Collected data was, then, analyzed by applying the concepts within the theoretical framework – Technological Mediation - to them.

    The results of this study provided a list of ICT-enabled devices and services that participants were using in their everyday life in order to support their memory such as: calendars, alarms, notes, bookmarks, etc. Furthermore, this study resulted in a detailed description of how these devices and services shaped/mediated the experiences and the actions of their users. 

  • 26.
    Aganovic, Deni
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Åhrberg, Cecilia
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Att fånga en oskuld: En undersökning kring ungdomars intresse för ekonomisk information online2010Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Att vid 18 års ålder tvingas ansvara för sina handlingar är för många ett stort steg, inte minst då en del av ansvaret är ekonomi. Ungdomarna vänder sig ofta till föräldrarna med frågor, men var ska de vända sig när föräldrarna inte har svaret? Bankerna har börjat söka sig lägre ner i åldrarna med sin marknadsföring för att fånga kunden innan denne blir myndig, men fortfarande är det många frågetecken kring informationen ungdomarna behöver.

    Uppdraget var att undersöka vad ungdomar behöver för information i en webbplats riktad mot ungdomar från banken. En undersökning genomfördes med en enkätundersökning med 100respondenter och tre olika fokusgrupper som genererade att ungdomarna känner att banker är alldeles för avlägsna. En minskad distans skulle medföra att ungdomarna lättare vänder sig till banken vid frågor kring sin ekonomi vilket i sin tur medför att deras intresse kring privatekonomiska frågor ökar.

    Designförslaget som presenteras fokuserar mycket på en funktion med textbaserad personlig service med co-browsingfunktioner som tillåter en bankman guida den unga kunden genom webbplatsen. Strävan är att ungdomarna ska känna en samhörighet till banken och lättare kan få alla typer av frågor besvarade då de var osäkra på vilken information de behöver. Om man inför en sådan tjänst bör användbarhetstest och utvärderingar på designförslaget genomföras för att kontrollera om distansen mellan bank och ungdom minskar.

  • 27.
    Aghaee, Saeed
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Random Stream Cipher2007Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [en]

    Stream ciphers are counted as an important part of symmetric encryption method. Their basic idea comes from One-Time-Pad cipher using XOR operator on the plain text and the key to generate the cipher. The present work brings a new idea in symmetric encryption method, which inherits stream key generation idea from synchronous stream cipher and uses division instead of xoring. The Usage of division to combine the plain text with stream key gives numerous abilities to this method that the most important one is using random factors to produce the ciphers.

  • 28.
    Agiorgitis, Georgios
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    ICTs use in the public Greek Primary Schools: the teachers' experiences2017Självständigt arbete på avancerad nivå (masterexamen), 80 poäng / 120 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Education is a sector that has the potential to become a critical area of action for the full exploitation of ICT. Educational systems of developed and developing countries have an ever-increasing tendency to apply ICT to education, in an attempt to prepare their students for the future's society. This thesis attempted to explore what kind of ICT is used in the Greek Primary Schools and develop an understanding on the relationship between the ICT and the teachers. The philosophical background is post-phenomenology and the methods chosen for collecting data for this research are policy document analysis and interviews. The empirical findings show that various ICT are being used in the classrooms of the Greek Primary Schools,  others widely and others occasionally. The research compares the legal framework revolving around ICT in Primary Schools in Greece, with the teachers' own experiences and shows that the guidelines suggested by the Greek Ministry of Education cannot be followed easily, due to economical and pedagogical reasons. It also investigates the ICT's effects on the teachers and the students through the teachers' own words and perceptions. The effects are mostly positive, there are mentioned however, some negative ones to take into consideration. Finally, the research presents a number of sectors where the participant teachers suggested there is room for improvement. By comparing the legal framework with the situation in the Primary Schools, this research adds a new perspective to the previous literature. The findings show that the current situation can be improved and the teachers' statements may trigger further research.

  • 29.
    Agiorgitis, Georgios
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Bennani, Mohamed
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Drakoularakos, Mixalis
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    McConnon, Paul John
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Digital Wall: The University’s learning and information space2017Studentarbete övrigt, 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    A North American university is engaged in a large transformation project involving the wholeorganisation. Students, Lecturers, departments and additional questions from the shared leadership team are engaging in defining the services offered, in particular from the university library and its associated sub-services. It is an exciting time for the University as it seeks to not only define its services but also how these can be created and consumed.There are many aspects to this re-organisation and many items to be addressed. In this report,we look at the current situation at the University, as well as taking into account the aspirations of the stakeholders. We start by drawing out a Rich Picture, part of Soft System Methodology (SSM) (Checkland, 1981) which we use in order to spot opportunities that are available for further exploration. Much of the information that we use comes from material supplied by the University itself as well as interviews with the Head of Library services and Head of Library IT. We look indepth at how SSM assists in this process of evaluation through its focus on participation and how it may assist us to understand the many different perspectives collected in our research. SSM consequently assists in defining problems with solutions to any areas that have drawn our attention. Following the evaluation of collected data, discussions and our own observations, we identify that a digital wall that is being proposed for the redesigned library presents an opportunity to explore possibilities for exploitation of this technology. Further research on other digital walls such as Brisbane’s Cube (Abdi et al, 2014), and Auraria Library’s Discovery Wall(Burch, 2016) shows some of the uses that these walls have been put to and how the Institutions use them. We then use a number of models to evaluate the data that we collected on digital walls and from the North American University and analyse it in order to inform our thinking. These models can be used independently or collectively to evaluate data from different perspectives. As such we were able to look at problems and solutions from the perspective of many of the actors involved in shaping the future library services. These models and results are discussed in the report. Finally, we take our results and make a number of proposals for the North American University digital wall along with the relevant justifications at the end of this report.

  • 30.
    Ahlander, Victoria
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Jonas, Jensen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Utbildning vid systemimplementering: Väsentliga faktorer att ta hänsyn till2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Utbildning i samband med systemimplementering är enligt tidigare forskning ett viktigt men åsidosatt ämne som behöver studeras mer i detalj. Den här uppsatsen undersöker vilka faktorer som är väsentliga vid en utbildningssituation i samband med införandet av ett nytt system i en kommunal organisation. Studien belyser faktorer som uppkommit i insamlingen av empiri samt de faktorer som framkommit från tidigare forskning och teoretisk bakgrund. Idag finns det ingen standardiserad modell för hur en användarutbildning bör se ut. Således presenteras de viktigaste faktorerna som ger en indikation på hur en utbildning påverkar implementeringsresultat och hur en bra användarutbildning bör se ut.

  • 31.
    Ahlberg, Tobias
    et al.
    Högskolan i Kalmar, Institutionen för kommunikation och design.
    Södergren, Marcus
    Högskolan i Kalmar, Institutionen för kommunikation och design.
    Voss, Martin
    Högskolan i Kalmar, Institutionen för kommunikation och design.
    Microsoft Windows Server 2008 Terminal Services vs. Citrix XenApp2008Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [sv]

    Den här rapporten undersöker om gränsen mellan Terminal Services och Citrix XenApp har börjat suddas ut eller om man ännu kan dra en tydlig linje mellan dessa. Detta för att avgöra om organisationer som idag kör Windows Server 2003 med Citrix XenApp enbart klarar sig med de nya funktionerna i Windows Server 2008 Terminal Services och ändå uppfylla de krav och behov en organisation har. Arbetet genomfördes rent teoretiskt. För att avgöra likheter och skillnader mellan applikationerna, så användes till största delen ett ramverk. För att kunna få en bild av hur applikationerna tillämpas rent praktiskt, användes tidigare testar samt analyser. Resultatet visar att Terminal Services tagit ett större steg inom marknaden för applikationsvirtualisering. Slutsatsen antyder att Windows Server 2008 Terminal Services är lämplig för organisationer utan komplexa behov.

  • 32.
    Ahlgren, Hannes
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Graph visualization with OpenGL2005Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats
    Abstract [en]

    Vizz3D is a 3D graphics code analysis tool, developed at Växjö University that optionally can use Java3D or OpenGL. However, initially Java3D was the only programming interface used. No other version was considered. Therefore the applications structure was built with the Java3D way of thought in mind. But code visualization with 3D graphics can be a demanding task for the computers processor and its graphics hardware and Java3D is known to be somewhat inefficient. So an OpenGL version was introduced.

    This thesis reflects on the work restructuring the application’s code to fit both versions within Vizz3D in a structured and object-oriented way. The thesis shows the efforts to be taken to make an existing ever evolving tool easily extendible to other API’s. Additional aspects of OpenGL specific implementations are discussed throughout the thesis.

  • 33. Ahlgren, Per
    et al.
    Grönqvist, Leif
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Evaluation of retrieval effectiveness with incomplete relevance data: theoretical and experimental comparison of three measures2007Ingår i: International Journal of Information Processing & Management, Vol. In press, s. 14-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The main reason for this work is to find an appropriate way to include multi-word units in a latent semantic vector model. This would be of great use since these models normally are defined in terms of words, which makes it impossible to search for many types of multi-word units when the model is used in information retrieval tasks. The paper presents a Swedish evaluation set based on synonym tests and an evaluation of vector models trained with different corpora and parameter settings, including a rather naive way to add bi- and trigrams to the models. The best results in the evaluation is actually obtained with both bi- and trigrams added. Our hope is that the results in a forthcoming evaluation in the document retrieval context, which is an important application for these models, still will be at least as good with the bi- and trigrams are added, as without.

  • 34. Ahlgren, Per
    et al.
    Grönqvist, Leif
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Measuring retrieval effectiveness with incomplete relevance data2006Ingår i: Current Research in Information Sciences and Technologies: Multidisciplinary approaches to global information systems (InSciT2006 proceedings), Open Institute of Knowledge , 2006, s. 74-78Konferensbidrag (Refereegranskat)
  • 35. Ahlgren, Per
    et al.
    Grönqvist, Leif
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Retrieval evaluation with incomplete relevance data: A comparative study of three measures (poster abstract)2006Ingår i: Proceedings of the 15th ACM International Conference on Information and Knowledge Management (CIKM), ACM Press, New York, NY, USA , 2006, s. 872-873Konferensbidrag (Refereegranskat)
  • 36.
    Ahlgren, Wilmer
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Johansson, Henrik
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Sociala interaktioner i video-slots: En kvalitativ studie om intresset för sociala interaktioner i video-slots och hur det kan utformas för att skapa en bra spelupplevelse samt om det kan bidra till en sundare spelstil2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Syftet med den här studien är att undersöka om det finns ett intresse för sociala interaktioner i video-slots och hur det i sådana fall kan utformas för att ge användarna en bra användarupplevelse. Onlinekasinon är den spelform som har ökat mest i popularitet i Sverige senaste åren och video-slots är den speltyp som växer mest. Tidigare studier visar på att det finns en drivkraft att göra saker tillsammans och som stärker och berikar upplevelser. Studier på sociala interaktioner i online-spel visar tydligt på att njutningen är ett viktigt element för att spela. Syftet är även att undersöka om sociala interaktioner i video-slots kan leda till en sundare spelstil för de med spelmissbruk.

    Video-slots är ett hedoniskt motivationssystem (HMS) och används för att ge användaren nöje och glädje i ett system. Teorin som studien baserats på är HMSAM, som är en HMS specifik modell som använts för att skapa en förståelse för uppfattad användarvänlighet, uppfattad användarnytta, glädje, kontroll och nyfikenhet, som kan påverka inre motivation. Inre motivation behövs för att användare ska kunna fördjupa sig och fortsätta vilja använda ett HMS-system. 

    Studien har en kvalitativ ansats och kvalitativa semi-strukturerade intervjuer har använts vid insamlandet av empiri. Fokus har legat på användarnas upplevelser, deras motivationer, drivkrafter, kontroll och önskemål kring sociala interaktioner vid spelande av video-slots. Intervjufrågorna grundas utifrån HMSAM men även utifrån spelifierings-ramverket Octalysis. Resultaten från datainsamlingen analyseras utifrån uppkomna kategorier och mönster. Analysen visade en stor motivation till att spela video-slots online tillsammans och att det skulle förhöja deras spelupplevelse. Även att det hade förenklat deras spelsessioner och skapat större gemenskap, då majoriteten av informanterna redan spelade video-slots tillsammans idag, med egna konstruerade metoder. Analysen visade också att informanterna spelar främst för nöjet och spänningens skull. Utifrån datan från intervjuerna togs designförslag fram, med stöd av spelifierings-ramverket. Designförslagen mynnade ut i sex grafiska gränssnittsskisser med funktioner som förhoppningsvis kan bidra till en förhöjd användarupplevelse.

  • 37.
    Ahlin, Daniel
    et al.
    Växjö universitet.
    Jartelius, Martin
    Växjö universitet.
    Tingdahl, Johanna
    Växjö universitet.
    Proxyserver för passiv informationssökning2005Självständigt arbete på grundnivå (kandidatexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [sv]

    I dagens samhälle översvämmas vi ofta av information. Detta gäller i allra högsta grad på Internet; betänk att en bra sökmotor i skrivande stund genomsöker 8 058 miljoner hemsidor. Det händer ofta att användare vet vad de söker för typ av information, svårigheten ligger i att snabbt kunna hitta den i det gytter av annan information som den ligger inbakad i. Vi anser att vi hittat en möjlig lösning till detta problem, där användaren själv kan ange vilken information som söks på en specifik server och sedan besöka de sidor som är intressanta. Informationen sparas och görs lättillgänglig för användaren. Vår lösning är baserad på en proxyserver, genom vilken användaren ansluter, som kan konfigureras för att spara olika typer av information. Vår metod med en fristående proxyserver är inte lika effektiv som att integrera lösningen i en webbläsare, men den bevisar att konceptet är fungerande.

    För mycket snabba anslutningar till en webbserver är det möjligt, om än svårt, att märka att proxyservern ligger mellan användaren och servern. Tidsförlusten är tidsskillnaden mellan att öppna en eller två TCP-anslutningar, samt till viss del förlust av tid på grund av Javas trådsynkronisering. Vid normala förhållanden med surfande mot servrar som inte står på det egna nätverket är tidsförlusten marginell.

  • 38.
    Ahlstrand, Marcus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Interaktion med en digital tjänst: En kvalitativ studie om hur god interaktion för en samhällstjänst kan utformas för medborgare2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    I det moderna samhället är vår interaktion med tjänster konstant och erbjuder möjligheter för en rikare vardag. Ett exempel är att statliga myndigheter tillhandahåller sina tjänster digitalt för att förenkla och förbättra samhällsservicen till medborgare. Samtidigt innebär interaktion med digitala tjänster en utmaning för användarna. Dessa utmaningar kan vara orsaken till att användare av Konsumentverkets digitala tjänst Budgetkalkylen uttryckt möjligheter för förbättring. I detta examensarbete används teori inom användarnytta, användbarhet och kognitiv belastning för att undersöka interaktionen mellan användare och Budgetkalkylen. Detta för att bidra med förbättringsförslag för ökad användarnytta, användbarhet samt minimal kognitiv belastning. Teorin beskriver hur den kognitiva belastningen av vårt arbetsminne påverkar användbarheten hos ett system. Användbarheten, som är av vikt då den skapar förutsättningar för bra samspel med en produkt, bildar tillsammans med nyttan produktens användarnytta. Med användarnytta menas att systemet erbjuder de funktioner och information som möjliggör måluppfyllelse för användaren. För att undersöka detta har en kvalitativ undersökning genomförts där intervjuer och användartester använts som insamlingsmetoder. Datainsamlingen utfördes med studenter som inte tidigare använt tjänsten. Resultatet visar att det fanns delar av interaktionen som utgjorde hög kognitiv belastning och minskade systemets användbarhet. Att dela upp uppgifterna och informationen i mindre steg, ge tydliga instruktioner och anpassa designen efter användarens kunskapsnivå anses minska den kognitiva belastningen. Nyttan låg i att skapa en helhetssyn över sin ekonomi, där hälften mer proaktivt ville sätta upp sparmål och den andra hälften ville använda den mer reaktivt. Litteratur som beskriver att kognitiv belastning påverkar användbarheten fick stöd genom denna undersökning. Metoden för att undersöka den kognitiva belastningen för att finna brister i interaktionen fick samtidigt stöd. 

  • 39.
    Ahltorp, Magnus
    et al.
    Stockholm.
    Skeppstedt, Maria
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap (DV). Gavagai, Stockholm.
    Kitajima, Shiho
    Hokkaido Univ, Japan.
    Henriksson, Aron
    Stockholm University.
    Rzepka, Rafal
    Hokkaido Univ, Japan.
    Araki, Kenji
    Hokkaido Univ, Japan.
    Expansion of medical vocabularies using distributional semantics on Japanese patient blogs2016Ingår i: Journal of Biomedical Semantics, ISSN 2041-1480, E-ISSN 2041-1480, Vol. 7, artikel-id 58Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Research on medical vocabulary expansion from large corpora has primarily been conducted using text written in English or similar languages, due to a limited availability of large biomedical corpora in most languages. Medical vocabularies are, however, essential also for text mining from corpora written in other languages than English and belonging to a variety of medical genres. The aim of this study was therefore to evaluate medical vocabulary expansion using a corpus very different from those previously used, in terms of grammar and orthographics, as well as in terms of text genre. This was carried out by applying a method based on distributional semantics to the task of extracting medical vocabulary terms from a large corpus of Japanese patient blogs. Methods: Distributional properties of terms were modelled with random indexing, followed by agglomerative hierarchical clustering of 3x100 seed terms from existing vocabularies, belonging to three semantic categories: Medical Finding, Pharmaceutical Drug and Body Part. By automatically extracting unknown terms close to the centroids of the created clusters, candidates for new terms to include in the vocabulary were suggested. The method was evaluated for its ability to retrieve the remaining n terms in existing medical vocabularies. Results: Removing case particles and using a context window size of 1 + 1 was a successful strategy for Medical Finding and Pharmaceutical Drug, while retaining case particles and using a window size of 8 + 8 was better for Body Part. For a 10n long candidate list, the use of different cluster sizes affected the result for Pharmaceutical Drug, while the effect was only marginal for the other two categories. For a list of top n candidates for Body Part, however, clusters with a size of up to two terms were slightly more useful than larger clusters. For Pharmaceutical Drug, the best settings resulted in a recall of 25 % for a candidate list of top n terms and a recall of 68 % for top 10n. For a candidate list of top 10n candidates, the second best results were obtained for Medical Finding: a recall of 58 %, compared to 46 % for Body Part. Only taking the top n candidates into account, however, resulted in a recall of 23 % for Body Part, compared to 16 % for Medical Finding. Conclusions: Different settings for corpus pre-processing, window sizes and cluster sizes were suitable for different semantic categories and for different lengths of candidate lists, showing the need to adapt parameters, not only to the language and text genre used, but also to the semantic category for which the vocabulary is to be expanded. The results show, however, that the investigated choices for pre-processing and parameter settings were successful, and that a Japanese blog corpus, which in many ways differs from those used in previous studies, can be a useful resource for medical vocabulary expansion.

  • 40.
    Ahmad, Khurram
    et al.
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Azeem, Muhammad
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Gold Standard Website2009Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

     

    The aim of this thesis is to design a web base system which provides functionality of comparison between two java files on the basis of point-to information (P2I). User will upload Java files and analysis of Java files called point-to analysis (P2A). System will store the files in the file system for reference and download in later time. System will extract the information called P2I from P2A and it will store that information in the database.

    Database should be flexible to accommodate the changes in P2A file and system should be able to extract the P2I and store it in database with minimum support of system administrator.

     

  • 41.
    Ahmed, Salah Uddin
    et al.
    University of South-Eastern Norway, Norway.
    Dalipi, Fisnik
    University of South-Eastern Norway, Norway.
    Ferati, Mexhid
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Plugin: a Crowdsourcing Mobile App for Easy Discovery of Public Charging Outlets2019Ingår i: HCI International 2019: Posters. HCII 2019 / [ed] Stephanidis C., Springer, 2019, Vol. 1034, s. 323-329Konferensbidrag (Refereegranskat)
    Abstract [en]

    Nowadays, the growth of mobile apps is so fast and viral; they have the potential of transforming our everyday lives by creating huge opportunities to individuals and businesses. This translates into a growing demand for developing such apps, which need to be easy to learn and use. In this paper, we conduct an evaluation of an android mobile app, which we designed and developed to find and register power outlets in public spaces. Our evaluation of the prototype consisted of two stages. First, we provided the users with two tasks, with an additional option to indicate their perception of how easy it was to complete these tasks. Second, upon completing both tasks and offering their comments, participants were asked to take the SUS (System Usability Scores) questionnaire. The results of the evaluation indicate that the app usability and learnability is acceptable despite being a prototype. The findings and participants’ comments give us a direction on how this app can be improved in the future.

  • 42.
    Ahmed, Samaar
    et al.
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Akram, Junaid
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    Promotion of Knowledge Sharing culture at local branch of a global Professional Services Firm: an Exploratory Case Study2011Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Professional Services Firms promote knowledge sharing cultures to maintain consistency in the internal flow of organizational knowledge. Building a knowledge sharing culture takes tough time. Enterprises make lot of efforts to share knowledge in effective way by adjusting the influencing factors like changing the organisational structure and culture, motivation and evaluation mechanism etc. Any knowledge management strategy designed to improve business performance must address the component “organizational culture” that includes behaviours, norms and practices. Organisation needs to promote knowledge sharing by adopting various methods for motivating employees, so they successfully diffuse their knowledge.The purpose of this case study was to explore the different issues faced by global Professional Services Firms while promoting knowledge sharing culture at their local branch. It was interesting to figure out that how a global „Professional Services Firm‟ promotes knowledge sharing culture at their local branch. Aim was also to highlight how these firms can change employee‟s „knowledge-hoarding behaviours‟ to „knowledge-sharing behaviours’ with the help of incentives and rewards.A qualitative exploratory case study was conducted by adopting social constructivist worldview. The research settings for our research were the Ernst & Young (Växjö) branch. Data was collected through observations and interviews. To assist the data collection phase, we have taken permission to observe their daily practises of knowledge sharing twice in a month.The main findings conclude that „Working as a unit‟ and „spirit of helping everyone‟ is a key to promote knowledge sharing culture at global Professional Services Firm‟s local branches. „Low power distances‟ as in „Nordic culture‟ provides solid platform for global Professional Services Firms to promote knowledge sharing culture. This is actually a good way of promoting knowledge sharing culture by decreasing level gap. Findings show that by decreasing level gaps and helping juniors, knowledge can become organisational rather than individual. Our investigation indicates that this local branch hasn‟t adopted any incentive programmes specifically for knowledge sharing. They are managing knowledge sharing with Nordic or Swedish way of working. Non-monetary incentives can be useful to motivate and reinforce specific behaviours of individuals. It can also helpful to boost up cooperative behaviours while working in teams. Professional Services Firms can win the battle of developing a true knowledge sharing culture by working as a unit, reducing power distances and motivating employees.

  • 43.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    A flexibility approach to planning an Intranet in support of knowledge work2004Ingår i: 15TH INTERNATIONAL WORKSHOP ON DATABASE AND EXPERT SYSTEMS APPLICATIONS, PROCEEDINGS / [ed] Tjoa, A. M. & Wagner, R.R ., IEEE Computer Society , 2004, s. 466-470Konferensbidrag (Refereegranskat)
  • 44.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    A knowledge perspective on e-democracy2003Ingår i: / [ed] Traunmüller, R, Berlin Heidelberg NewYork: Springer , 2003, Vol. 2739, s. 319-324Konferensbidrag (Refereegranskat)
  • 45.
    Aidemark, Jan
    Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
    A Multi-Dimensional Knowledge ManagementSystems Planning Approach2010Ingår i: Journal of information & knowledge management, ISSN 0219-6492, Vol. 09, nr 03, s. 291-302Artikel i tidskrift (Refereegranskat)
  • 46.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Cognitive, social and critical perspectives on planning a knowledge support portfolio2003Ingår i: 14TH INTERNATIONAL WORKSHOP ON DATABASE AND EXPERT SYSTEMS APPLICATIONS, PROCEEDINGS / [ed] Tjoa, A. M. and Wagner, R. R., IEEE Computer Society , 2003, s. 801-805Konferensbidrag (Refereegranskat)
  • 47.
    Aidemark, Jan
    Växjö universitet, Fakulteten för humaniora och samhällsvetenskap, Ekonomihögskolan, EHV.
    Implementing intranet for social and cognitive knowledge processes2005Ingår i: International Journal of Healthcare Technology and Management, ISSN 1368-2156, E-ISSN 1741-5144, Vol. 6, nr 4-6, s. 357-367Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper discusses a social and cognitive approach to the planning and implementation of knowledge support systems in a health care organization. A case study is presented and then discussed using a broad theoretical frame of reference gathered from the knowledge management field. The discussion is an illustration of the delicate trade-off between social and cognitive perspectives of a development project. The assumption is that these two aspects must be handled in an interconnected and balanced way. The aim of the paper is to illustrate the use of multiple perspectives as a tool for understanding how this problem can be dealt with.

  • 48.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Investigating Concepts for an Interconnected Socio/Technical KM Planning Approach2009Ingår i: Proceedings of the 10th European conference on Knowledge Management: ECKM 2009 - Università Degli Studi Di Padoava, Vicenza, Italy, 3-4 September 2009 / [ed] . Bolisani, E. and Scarso, E., Reading, England: Academic Publising Ltd , 2009, s. 1-9Konferensbidrag (Refereegranskat)
  • 49.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    IS Planning and Socio-technical Theory Perspectives2007Ingår i: Proceedings of European and Mediterranean Conference on Information Systems, Valencia, Spain, June 2007 / [ed] Adam, M.R., Ladron de Guevara, F.G., Gomez, H.G., Martinez, J.M.T., Rodriguez, G.I.M., Neto, J.M., The Information Institute , 2007Konferensbidrag (Refereegranskat)
  • 50.
    Aidemark, Jan
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Knowledge Management Paradoxes2009Ingår i: Electronic Journal of Knowledge Management, ISSN 1479-4411, E-ISSN 1479-4411, Vol. 7, nr 1, s. 1-10Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Knowledge management, as an academic area, is maturing; however, there are still problems connected with both the diversity of the theoretical base and the gap between theory and its practical application. In this paper we tackle these problems by reviewing a number of basic knowledge management theories with the intention of formulating a more integrated and at the same time practical planning framework. The focus guiding the literature selection is on basic theories about the nature of knowledge management, theories that expose the complex nature of knowledge in organizations. We examine these theories and try to understand what could be perceived as the paradoxical nature of these theories. Here we understand a paradox as something seemingly self-contradictory though perhaps actually well-founded statement. We focus on four areas or themes: 1) knowledge as the key resource of a business, 2) knowledge as a competitive force and source of growth, 3) the nature of the management of a knowledge resource, and 4) the management of knowledge workers. From a practical point of view, the conflicting arguments of these theories can be seen as possible strategic options. Based on these discussions we then formulate a framework, or what might be called a strategic option generator. As a concluding discussion we focus on the contribution of IS/IT to the realization of the different possible strategic options. This is done on a rather general level, where we examine the possibilities of IS/IT in relation to the paradoxes.

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