lnu.sePublications
Change search
Refine search result
45678910 301 - 350 of 1204
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 301.
    Fält Andersson, Sofie
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Gustavsson, Glenn
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Användbar användarmedverkan: Är användarmedverkan positivt för systemutvecklingsprocessen?2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Computer use at work has risen considerably over the past fifteen years and is currently a relatively common phenomenon when 76 percent of women and 72 percent of men using the computer in their daily work (SCB Arbetsmiljörapport 2009).According to Gulliksen and Göransson (2009), Sweden is one of the countries which are more advanced in the procurement of computer systems at work. He means that Sweden has unique opportunities and conditions for user participation in the development of computer systems, when the user has the right to influence their working environment through a law in the Work Environment Act. The paper examines the importance of user involvement in system development and the Swedish company's approach and experience of user involvement. To highlight and explore the importance of user involvement, there has been a case study in which users have been representative of the development process. The case study has been conducted on a case company where the system IST analys was in need of a new interface. The development process has been as such that the developers have worked out their requirements before users have been interviewed and had to give their requirements. This is to compare the requirements of developers and users and whether users gave useful requirements.To investigate the Swedish company's approach to user participation has a questionnaire sent out and it has also been a discussion with two experienced system developers. The conclusion has been that it is advantageous to user participation in systems development but that it is important to have a controlled process that allows users to not steer too much.

    Download full text (pdf)
    fulltext
  • 302.
    Förderer, Steffen-Marc
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Converting Network Media Data into Human Readable Form: A study on deep packet inspection with with real-time visualization.2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A proof of concept study into the working of network media capture and visualization through the use of Packet Capture in real-time. An application was developed that is able to capture tcp network packets; identify and display images in raw HTTP network traffic through the use of search, sort, error detection, timeout failsafe algorithms in real time. The application was designed for network administrators to visualize raw network media content together with its relevant network source \& address identifiers. Different approaches were tried and tested such as using Perl with GTK+ and Visual Studio C\# .Net. Furthermore two different types of image identification methods were used: raw magic string identification in pure tcp network traffic and HTTP Mime type identification. The latter being more accurate and faster. C# was seen as vastly superior in both speed of prototyping and final performance evaluation. The study presents a novel new way of monitoring networks on the basis of their media content through deep packet inspection

    Download full text (pdf)
    fulltext
  • 303.
    Gallardo Salas, Carlos
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Extremera Sánchez, Adrián
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Web Development Frameworks: Ruby on Rails VS Google Web Toolkit2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Web programming is getting more and more important every day and as a consequence, many new tools are created in order to help developers design and construct applications quicker, easier and better structured. Apart from different IDEs and Technologies, nowadays Web Frameworks are gaining popularity amongst users since they offer a large range of methods, classes, etc. that allow programmers to create and maintain solid Web systems.This research focuses on two different Web Frameworks: Ruby on Rails and Google Web Toolkit and within this document we will examine some of the most important differences between them during a Web development.

    Download full text (pdf)
    fulltext
  • 304.
    Galster, Matthias
    et al.
    University of Groningen ; The Netherlands.
    Avgeriou, ParisUniversity of Groningen, The Netherlands.Weyns, DannyLinnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.Becker, MartinFraunhofer IESE, Germany.
    WICSA/ECSA '12 Proceedings of the WICSA/ECSA 2012 Companion Volume2012Conference proceedings (editor) (Refereed)
    Abstract [en]

    Variability is the ability of a software system or artifact to be adapted for specific contexts, in a preplanned manner. Many of today's software systems are built with variability in mind, e.g., product lines and families, self-adaptive systems, open platforms, or service-based systems that support dynamic runtime composition of web services. Variability is reflected in and facilitated through the software architecture. Also, as the software architecture is a reference point for many development activities and for achieving quality attributes, variability should be treated as a first-class and cross-cutting concern in software architecture. Therefore, the Second International Workshop on Variability in Software Architecture (VARSA 2012) aims at identifying critical challenges and progressing the state-of-the-art on variability in software architecture. VARSA 2012 is a follow-up of the First International Workshop on Variability in Software Architecture (VARSA 2011), held at WICSA 2011.

  • 305. Galster, Matthias
    et al.
    Avgeriou, Paris
    Weyns, Danny
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Männistö, Tomi
    Variability in software architecture: current practice and challenges2011In: Software Engineering Notes: an Informal Newsletter of The Specia, ISSN 0163-5948, E-ISSN 1943-5843, Vol. 36, p. 30-32Article in journal (Refereed)
    Download full text (pdf)
    2011SEN
  • 306.
    Gamme, Joacim
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Att skapa användbarhet: och välja metoder med omsorg2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

     

    Denna uppsats handlar om arbetsprocesser ur ett användbarhetsmetodiskt perspektiv. Metoder och aktiviteter som kan tillämpas vid utveckling av digitala gränssnitt kommer att beskrivas och vilka risker som kan uppstå om arbetsprocessen inte innehåller vissa metoder. Målet var att klart definiera begreppet användbarhet för att i slutet av arbetet kunna verifiera de olika metoderna utifrån detta begrepp. God användbarhet som i sin tur ligger till grund för bättre användarupplevelser och mer framgångsrika produkter.

     

    Undersökningen grundar sig på två sedan tidigare utvecklade arbetsprocesser och en fallstudie i syfte att förstå svårigheterna som kan uppstå vid utvecklingen. Det gjordes en matris av de teoretiska arbetsprocesserna som sedan jämfördes med resultatet ifrån fallstudien.

     

    Undersökningen resulterade i ett flertal punkter i arbetsprocessen där förändringar ur ett användbarhetsperspektiv skulle kunna genomföras. Det visade sig att metoder som ser till användarens behov och krav inte tillämpas i den utsträckning de borde för att skapa förutsättningar för god användbarhet och användarupplevelser. Det framgick att användarperspektivet är viktigt och kan ge utvecklare bra data om hur produkter upplevs och används. Användare skall ha en mer central roll underutvecklingsprocessen. Detta för att inte riskera en självförverkligande design som bygger på utvecklarens egna erfarenheter och fördomar. Arbetsprocessen och dess innefattade metoder är därför viktigt att den betänks noga.

    Download full text (pdf)
    Att skapa användbarhet
  • 307.
    Gil de la Iglesia, Didac
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Designing a Decentralized Distributed Self-Adaptive System in M-Learning Activities2012In: Proceedings 2012 17th IEEE International Conference on Wireless, Mobile and Ubiquitous Technology in Education, WMUTE 2012, IEEE, 2012, p. 296-300Conference paper (Refereed)
    Abstract [en]

    The use of mobile technologies in education has increased the amount of tools that can be used for pedagogical purposes. However, the introduction of these technologies comes with challenges that require from attention. The first of them is concerning with the limitations that these devices have in features when compared with laptop and desktop computers, naming the screen size, performance and memory space among others. A mechanism to address this limitation can be the combination of multiple devices in groups and share the resources within these groups. The second limitation that this paper addresses is with regard to these devices being prone to failures in relation with their availability, due to its battery life, connectivity, etc. This paper presents a decentralized distributed self-adaptive system that attempts to cover both the limitations in features of these devices, by combining the devices in organizations, named MVD, and the weakness in availability by providing a self-adaptation mechanism. Moreover, the paper presents the identified required components for the creation of a system that provides such benefits and illustrates the internal functionality of the system to provide the self-adaptive quality.

  • 308.
    Gil de la Iglesia, Didac
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Exploring New Ways to Support Mobile Collaboration Through Mobile Virtual Devices2010Other (Other academic)
    Abstract [en]

    The use of mobile technologies to support novel ways of teaching and learning has been an opening door for carrying out more free educational scenarios during the last years. The imposed restrictions of traditional learning settings have been partially overcome in the field of mobile learning. However, some restrictions still remain by the constrains and limitations of mobile devices and wireless technologies. Many of these restrictions are related to issues connected to mobile performance, but the limited amount of resources one mobile device can offer is also a boundary the learning activities have met. In the scope of this paper, the concept of Mobile Virtual Device (MVD) is presented and discussed. A MVD is an organization wherein several mobile devices form a membership in order to share their individual resources and services for creating a more powerful instance. A MVD, with the aggregation of several resources from multiple devices, enables to provide support for new learning activities that were not possible before. In this article, we present the benefits of this conceptualization and two examples where this concept has been applied. We envision a high potential offered by these enhanced virtual devices, although some challenges arise in its use, both technical and social, which should be discussed and addressed.

  • 309.
    Gil de la Iglesia, Didac
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Uncertainties in Mobile Learning applications: Software Architecture Challenges2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The presence of computer technologies in our daily life is growing by leaps and bounds. One of the recent trends is the use of mobile technologies and cloud services for supporting everyday tasks and the sharing of information between users. The field of education is not absent from these developments and many organizations are adopting Information and Communication Technologies (ICT) in various ways for supporting teaching and learning. The field of Mobile Learning (M-Learning) offers new opportunities for carrying out collaborative educational activities in a variety of settings and situations. The use of mobile technologies for enhancing collaboration provides new opportunities but at the same time new challenges emerge.

    One of those challenges is discussed in this thesis and it con- cerns with uncertainties related to the dynamic aspects that characterized outdoor M-Learning activities. The existence of these uncertainties force software developers to make assumptions in their developments. However, these uncertainties are the cause of risks that may affect the required outcomes for M-Learning activities. Mitigations mechanisms can be developed and included to reduce the risks’ impact during the different phases of development. However, uncertainties which are present at runtime require adaptation mechanisms to mitigate the resulting risks.

    This thesis analyzes the current state of the art in self-adaptation in Technology-Enhanced Learning (TEL) and M-Learning. The results of an extensive literature survey in the field and the outcomes of the Geometry Mobile (GEM) research project are reported. A list of uncertainties in collaborative M-Learning activities and the associated risks that threaten the critical QoS outcomes for collaboration are identified and discussed. A detailed elaboration addressing mitigation mechanisms to cope with these problems is elaborated and presented. The results of these efforts provide valuable insights and the basis towards the design of a multi-agent self-adaptive architecture for multiple concerns that is illustrated with a prototype implementation. The proposed conceptual architecture is an initial cornerstone towards the creation of a decentralized distributed self-adaptive system for multiple concerns to guarantee collaboration in M-Learning. 

    Download full text (pdf)
    fulltext
  • 310.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Almiron, Daniel
    Växjö Universitetet and Universitat Autonoma de Barcelona.
    A Case-Based Engine to Create Dynamic Content Adapting Users’ and Context Profiles2004Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 311.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Andersson, Jesper
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Enhancing Mobile Learning Activities by the Use of Mobile Virtual Devices: Some Design and Implementation Issues2010In: 2010 2nd International Conference on Intelligent Networking and Collaborative Systems (INCOS), IEEE Press, 2010, p. 137-144Conference paper (Refereed)
    Abstract [en]

    The use of multiple mobile devices is increasing in mobile learning, bringing a need for collaboration and resource sharing among participating pupils. This paper presents an approach that addresses information and resource sharing for mobile devices in indoors and outdoors settings. Our solution consists of aggregated mobile devices, forming organizations. These Mobile Virtual Devices (MVDs) provide a new mechanism that facilitates design of mobile learning activities offering a virtual complex device that combines the features of several mobile devices.

  • 312.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Andersson, Jesper
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Mobile Virtual Devices for Collaborative M-Learning2010In: Workshop Proceedings of the 18th International Conference on Computers in Education, Asia-Pacific Society for Computers in Education, 2010Conference paper (Refereed)
    Abstract [en]

    The increasing use of mobile devices to support collaborative activities creates a need for developing new methods and perspectives to facilitate information sharing. In this paper, we present an approach for information sharing in mobile collaborative settings through the use of Mobile Virtual Devices (MVD). MVD emerges as a new conceptualization of an organization of mobile devices that supports collaborative tasks. The use of MVD allows designers and users to interact with and through mobile devices in novel ways, considering the aggregation of mobile devices as a single entity. The notion of MVD has been conceptualized on the idea of multirole devices, using components to provide and consume resources.

  • 313.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Andersson, Jesper
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Sollervall, Håkan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Towards a Decentralized and Self-Adaptive System for M-Learning Applications2012In: Seventh IEEE International Conference on Wireless, Mobile and Ubiquitous Technology in Education: Takamatsu, Kagawa, Japan, 27-30 March 2012, IEEE, 2012, p. 162-166Conference paper (Refereed)
    Abstract [en]

    Through the analysis of the different iterations of the Geometry Mobile (GEM) project, a mobile learning effort in the field of mathematics, we have identified a major architectural issue to be addressed in the design and implementation of m-learning applications. Due to the dynamic nature of the field many challenging requirements are continuously emerging. One of them relates to the possibility to support collaborative activities that demand sharing resources between students and their mobile devices in constantly changing conditions. These situations generate the need of using decentralized distributed architectures in which mobile devices can share resources to carry out the activity covering the concerns defined by the different stakeholders. This paper describes our current efforts connected to identifying a set of requirements for M-Learning activities. Thereafter, we elaborate on why a decentralized distributed system (DDS) can be used to provide a novel solution to tackle the mentioned above problems. Moreover, initial aspects related to the design of a DDS, including a self-adaptation mechanism are presented.

  • 314.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Andersson, Jesper
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Software Requirements to Support QoS in Collaborative M-Learning Activities2012In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 7493, p. 176-183Article in journal (Refereed)
    Abstract [en]

    The use of collaborative activities in education has proven to be an effective way to enhance students’ learning outcomes by in- creasing their engagement and motivating discussions on the learning topics under exploration. In the field of Technology Enhanced Learn- ing (TEL), the use of information and communication technologies has been extensively studied to provide alternative methods to support col- laborative learning activities, combining different applications and tools. Mobile learning, a subset of TEL, has become a prominent area of re- search as it offers promising tools to enhance students’ collaboration and it provides alternative views for teaching and learning subject matter in relevant and authentic scenarios. While many studies have focused on the pedagogical opportunities provided by mobile technologies, fewer are the efforts looking at technological related aspects. Hardware and software issues in this field still remain as challenges that require a deeper level of study and analysis. This paper presents and discusses the findings of a deep analysis based on the outcomes of three mobile collaborative learning activities and their requirements. These results have helped us to identify a number of arising challenges that need to be addressed in order to warranty Quality of Service (QoS) in these collaborative M- learning activities. Moreover, the paper offers a view on current practices in M-learning activities, which evidences the lack of research addressing software engineering aspects in mobile collaborative learning. 

  • 315.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Pettersson, Oskar
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Providing Flexibility in Learning Activities Systems by Exploiting the Multiple Roles of Mobile Devices2010In: Proceedings of 6th IEEE International Conference on Wireless, mobile and Ubiquitous Technologies in Education, IEEE, 2010, p. 166-170Conference paper (Refereed)
    Abstract [en]

    The wide adoption of mobile and wireless technologies allow for users to have access to learning resources and generate digital content at any location and time. An immediate implication of this latest trend is the need to create and deploy learning activity systems that offer a high level of flexibility. This flexibility can allow for the creation of adaptive activities, something highly required in dynamic learning environments such as those in the field of M-learning. Mobile devices can provide flexibility to activity systems by adapting their behavior on a context basis. To give an example of flexibility in the mobile device behavior, we present the FLexible Activity Client (FLAC). FLAC is a mobile application that allows the mobile device to switch from client-role to service-provider-role behavior. We describe our proposed architecture and its implementation and present the results of our initial tests.

  • 316.
    Gil de la Iglesia, Didac
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Weyns, Danny
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Enhancing Software Qualities in Multi-Agent Systems using Self-Adaptation2012In: Proceedings of European Workshop on Multi-Agent Systems EUMAS 2012, Asia-Pacific Society for Computers in Education, 2012, p. 1-15Conference paper (Refereed)
    Abstract [en]

    Engineering multi-agent systems (MAS) is known to be a complex task. One of the reasons lays in the complexity to combine multiple concerns that a MAS is expected to address, such as system functionality, coordination, robustness, etc. A well-recognized approach to manage system complexity is the use of self-adaptive (SA) mechanisms. Self-adaptation allows to adjust the system behavior in order to achieve certain software qualities (optimization, fault-tolerance, etc.). The key idea behind self-adaptation is complexity management through separation of concerns. In this paper we introduce SA-MAS, an architectural approach that integrates the functionalities provided by a MAS with software qualities oered by a SA solution. The paper presents a reference model for SA-MAS and applies it to a Mobile learning case, in which we deal with robustness properties. In addition, we apply formal verication techniques as an approach to guarantee the requirements of the SA-MAS application.

    Download full text (pdf)
    fulltext
  • 317.
    Gill, Erica
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Vad tycker studenter och lärare om Blackboard?: En undersökning över användandet av lärplattformen Blackboard vid Centrum för Informationslogistik2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    Vad tycker studenter och lärare om Blackboard
  • 318.
    Gillström, Niklas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Malware och injicering i Windows för inbyggda system2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    Malware och injicering i Windows för inbyggda system
  • 319.
    Glavas, Zdenko
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Feedbackmetodik: Ett strukturerat sätt för att bearbeta feedback2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 320. Gleicher, Michael
    et al.
    Albers, D.
    Walker, R.
    Jusufi, Ilir
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Hansen, C. D.
    Roberts, Jonathan C.
    Visual Comparison for Information Visualization2011In: Information Visualization, ISSN 1473-8716, E-ISSN 1473-8724, Vol. 10, no 5-4, p. 289-309Article in journal (Refereed)
    Abstract [en]

    Data analysis often involves the comparison of complex objects. With the ever increasing amounts and complexity of data, the demand for systems to help with these comparisons is also growing. Increasingly, information visualization tools support such comparisons explicitly, beyond simply allowing a viewer to examine each object individually. In this paper, we argue that the design of information visualizations of complex objects can, and should, be studied in general, that is independently of what those objects are. As a first step in developing this general understanding of comparison, we propose a general taxonomy of visual designs for comparison that groups designs into three basic categories, which can be combined. To clarify the taxonomy and validate its completeness, we provide a survey of work in information visualization related to comparison. Although we find a great diversity of systems and approaches, we see that all designs are assembled from the building blocks of juxtaposition, superposition and explicit encodings. This initial exploration shows the power of our model, and suggests future challenges in developing a general understanding of comparative visualization and facilitating the development of more comparative visualization tools.

  • 321.
    Glennsjö, Fredrik
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematikundervisning på modersmål2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Modern forskning lyfter fram modersmålets betydelse för inlärningen och därför är det intressant att undersöka vilken insats modersmålslärarna kan göra för att stödja elevers matematiklärande. Syftet med arbetet är att utifrån några verksamma modersmålslärares perspektiv studera minoritetselevers lärande i matematik i den svenska skolan.

    Studien bygger på intervjuer med fyra modersmålslärare med lång erfarenhet inom yrket.  Undersökningen visar att matematikundervisningen på modersmål karaktäriseras av elever som känner sig trygga, som talar mycket matematik i små grupper där de växlar mellan båda sina språk.  

    Download full text (xml)
    FULLTEXT01
  • 322.
    Golshan, Behrooz
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Social Media as Cure for Information Overload: An Action Research In Swedish Healthcare2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Information and communication technology (ICT) had a huge impact on the healthcare services and the Internet plays an important role in forming patients’ attitudes towards health related services. Although the Internet mentioned as one of the major contributors in todays’ Information Overload (IO), common notion is that healthcare sector has been remained immune of IO effects. Throughout an action research, this study showed that IO has significant impact on treatment sessions of patients suffering from chronicle mental disorders in two ways. Firstly, patients’ acquired information from the Internet bombards physician in the treatment sessions, which eventually slows down the treatment process. Secondly, protocols and administrative procedures are subject to change, which leads to frustrating relearning cycles due to the huge amount of information attaching to them. Also, physicians have a tendency to keep themselves updated about new achievements in their field, which adds to the IO problem. In an attempt to enhance the situation an application model purposed in the second half of this research, which uses social web as a platform to provide a service based on Information Logistics (IL) principles to deal with the problem of IO. 

    Download full text (pdf)
    fulltext
  • 323.
    Gomér Jonasson, Ann-Christine
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Vilka kunskaper behöver lärare för att arbeta med öppna uppgifter i matematik?: En undersökning av ett utvecklingsarbete för lärare, med fokus på öppna uppgifter.2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Öppna uppgifter kan generera flera lösningar och låter även eleverna utveckla sin problemlösningsförmåga. Syftet med undersökningen har varit att ta del av erfarenheter som lärare gjort genom att delta i ÄlMa, ett fortbildningsprojekt med fokus på öppna uppgifter. Undersökningens frågeställning är: Vad behöver lärare kunna för att arbeta med öppna uppgifter och hur har lärarna utvecklats genom att delta i projektet? Undersökningen har bestått av intervjuer där sex lärare som deltagit i projektet, beskriver sitt arbete med öppna uppgifter. För att arbeta med öppna uppgifter anser lärarna att de behöver kunskaper som flexibilitet, att läraren låter eleverna diskutera, att läraren vågar släppa kontrollen, samt att läraren har matematisk kunskap. I intervjuerna framgår att deltagarna saknar detta i sin lärarutbildning, utan har stället, fått utveckla dessa kunskaper genom erfarenheter i arbetslivet. Undersökningen synliggör även faktorer som påverkat lärarnas arbete med öppna uppgifter. Det handlar om arbete med öppna uppgifter i praktiken, lärarens egen kunskap och erfarenhet, kunskap om läroplanen, matematiska sammanhang, instruktioner, lärarnas syn på elevers förmåga att lösa problem, reflektion, samt läromedel. Deltagandet i projektgrupperna har lett till att lärarna har utvecklat praktikgemenskaper. De känner en ökad gemenskap och inser vikten av att ta del av andras erfarenheter. De har insett att för att kunna utvecklas i sitt arbete med öppna uppgifter behöver de få fortsatta möjligheter att träffas och diskutera. För att lärarna ska känna större säkerhet när de arbetar med öppna uppgifter, bör de få möjlighet att utveckla kunskaper för det, under sin lärarutbildning.

    Download full text (pdf)
    Ann-Christine Gomer Jonasson
  • 324.
    Goncharova, Iuliia
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Investigation of a small-sized omnidirectional antenna2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this research is to find ways to create an omnidirectional antenna with high directivity in the vertical plane. The investigation is based on computer simulation using the program CST 2011. The objective is a narrow-band antenna that is omnidirectional in the horizontal plane and has maximum achievable directivity for a fixed size.

    Three of the most promising antenna designs are selected based on the current state of antenna technology. Their maximum directivities are estimated by means of well known relations in antenna theory. It is shown that the most suitable design is an omnidirectional antenna in the form of a cylindrical dipole antenna array with an active central dipole. For this antenna, excitation by means of a radial traveling wave, with a phase velocity smaller than speed of the light, is possible. It is found that for a certain value of a moderating factor it is possible to obtain a directivity that is 2.5 – 3 dB larger than that of a dipole or a linear antenna with uniform excitation. The antenna structures are modeled to determine the number of dipoles, their dimensions and the spacing between them that maximizes the directivity.

    Download full text (pdf)
    fulltext
  • 325.
    Granqvist, Carina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Joman, Mimmi
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematik på ett lustfyllt sätt i meningsfulla sammanhang: - Hur pedagoger i förskola och förskoleklass kan arbeta med grundläggande taluppfattning2010Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

                        

    Syftet med undersökningen är att ta reda på hur pedagoger i förskola och förskoleklass kan arbeta för att göra barns lärande kring grundläggande taluppfattning lustfyllt i meningsfulla sammanhang. Undersökningen bygger på kvalitativa intervjuer med tre förskollärare och två matematikutvecklare. Vi använde oss av semistrukturerade frågor.

     

    Av resultaten framgår att pedagogerna har en medveten och strukturerad planering där barnen utmanas på rätt nivå. Pedagogerna både väcker intresse för matematik och tar tillvara på barnens egna idéer. Det gör att barnens grundläggande taluppfattning stärks på ett lustfyllt och meningsfullt sätt och barnen utvecklar lust att lära och tillit till sin egen förmåga.

     

    Slutsatserna av undersökningen är att dialogen mellan pedagog och barn är mycket betydelsefull. Pedagogers förhållningssätt och val av metod och material spelar stor roll för barns lärande kring grundläggande taluppfattning. Genom att pedagoger anpassar och varierar nivån på matematiska utmaningar stärks barns självkänsla och lärandet stimuleras.

     

     

     

    Download full text (pdf)
    FULLTEXT01
  • 326.
    Grettve, Pierre
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    En studie om möjligheter att stoppa förfalskningar: Spårbarheten i en global värld2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to describe the traceability of products that protect against counterfeiting and examine how protection against counterfeit products have been developed to date, and to display the opportunity to streamline the protection of products and brands.

    Nowadays, in the global world, it is getting increasingly more difficult to track the products. Especially for the last link in the chain, which in most cases is the customer and who is constantly exposed to risks. This report deals with the possibilities of preventing and detecting counterfeit products. Fake products are not unusual in an historical perspective. It has been common with counterfeits ever since the Middle Ages continuously until today. Forgers have become more skillful and they are successful in most industries. Many of the fake products are of poor quality and can be downright dangerous to the customer.

    To answer the question, the author used a qualitative collection method. Interviews took place with seven respondents from the pharmaceutical industry, government agencies and professional organizations. The study showed that all the interviewed pharmaceutical companies have been exposed to their products being copied. Despite attempts finding a common solution for the medical industry, nationally and internationally, such a solution has not yet been adopted. Each company has tried to protect themselves with several technical solutions. Authorities have been running campaigns, trying to get consumers to avoid buying counterfeit products.

    Today the work is done through the development of laws, regulations, packaging, labelling and tracing techniques. It has been primarily done on a corporate or national level. This has until now often been ineffective because the counterfeiting industry is a global phenomenon.

    The conclusion of this study is that in order to reach international harmonization, the legislation and regulation is required, to be able to interact with standardized techniques to detect and prevent fraud in the entire supply chain for each industry.

    Download full text (pdf)
    FULLTEXT01
  • 327.
    Grinchenko, Oleksandr
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Difficulty of porting MVC Supervising Controller game from Windows OS to Android OS platform.2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 328.
    Grundén, Helena
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematiskt innehåll och förmågor: Lärares tankar om en uppgift i matematik2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Lärare planerar undervisning och väljer vad eleverna ska arbeta med. Denna studie syftar till att undersöka lärares tankar om vilket matematiskt innehåll elever möter samt vilka förmågor elever tränar i arbetet med en uppgift i matematik. Studien genomfördes genom intervjuer med fem lärare som fick svara på frågor kring en uppgift i matematik. De övergripande frågorna handlade om matematiskt innehåll och förmågor, men även uppgiftens koppling till Lgr11 efterfrågades. Lärarnas svar kopplades till de specifika kunskaper som behövs för att undervisa i matematik.

    Studien visade att lärarna i hög utsträckning sorterade in uppgiften inom området kombinatorik och att de framförallt såg uppgiften som en problemlösningsuppgift. När lärarna diskuterade det matematiska innehållet var det ingen som framhöll kombinatorikens olika generella formler och heller ingen som angav kombinatoriken som en grund för att förstå begreppet sannolikhet.

    Lärarna motiverade främst användandet av uppgiften med de i kursplanen beskrivna långsiktiga målen, förmågorna, men frågetecken kring hur lärarna tolkar dessa förmågor dök upp under studiens gång.

    I analysen av uppgiften visade lärarna prov på flera aspekter av Mathematical knowledge for teaching,  även om studien också visade att de specifika kunskaper som krävs för undervisning i matematik kan utvecklas

    Download full text (pdf)
    Matematiskt innehåll och förmågor
  • 329.
    Gryth, Alexander
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    API:er i den offentliga sektorn: Öppenhet och datatillgänglighet enligt offentlighetsprincipen och PSI-direktivet2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden has long had a good tradition of openness in the public sector, thanks to the principle ofpublic access. But due to increasing technological advances and demands on data availability theclassic transparency is no longer sufficient. There are already very interesting public data sets inSweden, but in most cases they are either stored in formats that are difficult to read digitally or it'stoo expensive to use.This thesis examines how an API can be developed, used and integrated with other API:s to open upthe above mentioned data in a better way and make it more accessible to potential users.Furthermore, the real benefits of the PSI directive are examined, and how they along with theprinciple of public access can contribute to the new openness. In connection to this thesis aprototype has also been developed to provide examples of how to combine different API:s for thevisualization of geographic data, and how an API can be built on top of the visualization to makethis data more available.

    Download full text (pdf)
    fulltext
  • 330. Gröchenig, Karl-Heinz
    et al.
    Toft, Joachim
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Isomorphism properties of Toeplitz operators and pseudo-differential operators between modulation spaces2011In: Journal d'Analyse Mathematique, ISSN 0021-7670, E-ISSN 1565-8538, Vol. 114, no 1, p. 255-283Article in journal (Refereed)
    Abstract [en]

    We investigate the lifting property of modulation spaces and construct explicit isomorpisms between them. For each weight function \omega and suitable window function \varphi, the Toeplitz operator (or localization operator) TP _\varphi (\omega ) is an isomorphism from M^{p,q}_{(\omega _0)} into M^{p,q}_{(\omega _0/\omega )} for every p,q\in [1,\infty ] and arbitrary weight function \omega _0. The methods involve the pseudo-differential calculus of Bony and Chemin and the Wiener algebra property of certain symbol classes of pseudo-di®erential operators.

  • 331.
    Grönvall, Emma
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Kliniska riktlinjer i teori och praktik: En studie vid Sahlgrenska Universitetssjukhuset2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    Kliniska riktlinjer i teori och praktik en studie vid Sahlgrenska Universitetssjukhuset
  • 332.
    Gul, Ahtsham
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Zaib, Amir
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Inter-cultural problems of IT-services outsourcing from Sweden to India2010Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    IT-services outsourcing from Sweden to India has increased in the last few years and it is often regarded as a strategic measure to handle the increasing costs of IT-related development and maintenance operations. There are a number of advantages of outsourcing however, there are many challenges that outsourcing initiatives face. One of the challenges mentioned by many researchers is the cultural differences between the Swedish culture and the Indian culture. At the same time there is not enough research done about these cultural differences in the context of IT-services outsourcing from Sweden to India. It creates difficulties for the partners involved in an IT services outsourcing initiative to achieve the desired results.

    In this work we have researched these problems by sending questionnaire to IT-outsourcing companies in Sweden. The questionnaire was prepared after a thorough literature review. The participants were asked if they are still facing the problems identified in the literature review and to also mention any other cultural problems faced by them. The questionnaires were analysed and the results obtained are presented in this work. The results show that the practitioners were still facing the problems. This thesis identifies the root causes, the negative effects and also suggests ways for handling the problems. This research will help the IT-services outsourcing practitioners to manage these problems for achieving better result.

    Download full text (pdf)
    FULLTEXT01
  • 333.
    Gulzar, Muhammad Atif
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nawaz, Rashid
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Thapa, Devendra
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Implementation of MIMO-OFDM System for WiMAX2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Error free transmission is one of the main aims in wireless communications. With the increase in multimedia applications, large amount of data is being transmitted over wireless communications. This requires error free transmission more than ever and to achieve error free transmission multiple antennas can be implemented on both stations i.e. base station and user terminal with proper modulation scheme and coding technique. The 4th generation of wireless communications can be attained by Multiple-Input Multiple-Output (MIMO) in combination with Orthogonal Frequency Division Multiplexing (OFDM).

    MIMO multiplexing (spatial multiplexing) and diversity (space time coding) having OFDM modulation scheme are the main areas of focus in our thesis study. MIMO multiplexing increases a network capacity by splitting a high signal rate into multiple lower rate streams. MIMO allows higher throughput, diversity gain and interference reduction. It also fulfills the requirement by offering high data rate through spatial multiplexing gain and improved link reliability due to antenna diversity gain.

    Alamouti Space Time Block Code (STBC) scheme is used with orthogonal designs over multiple antennas which showed simulated results are identical to expected theoretical results. With this technique both Bit Error Rate (BER) and maximum diversity gain are achieved by increasing number of antennas on either side. This scheme is efficient in all the applications where system capacity is limited by multipath fading.

    Download full text (pdf)
    Final Thesis Report
  • 334.
    Gumeniuk, Oleg
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Design and implementation of a next generation web interaction SaaS prototype2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Download full text (pdf)
    Master_Thesis_Oleg_Gumeniuk
  • 335.
    Gummesson, Ann-Sofie
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Cederqvist, Anneli
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematik i närmiljön: uterummet som en alternativ lärmiljö2011Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 336.
    Gustafsson, Alexander
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Electron transport in quantum point contacts: A theoretical study2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Electron transport in mesoscopic systems, such as quantum point contacts and Aharonov-Bohm rings are investigated numerically in a tight-binding language with a recursive Green's function algorithm. The simulation reveals among other things the quantized nature of the conductance in point contacts, the Hall conductance, the decreasing sensitivity to scattering impurities in a magnetic field, and the periodic magnetoconductance in an Aharonov-Bohm ring. Furthermore, the probability density distributions for some different setups are mapped, making the transmission coefficients, the quantum Hall effect, and the cyclotron radius visible, where the latter indicates the correspondance between quantum mechanics and classical physics on the mesoscopic scale.

    Download full text (pdf)
    FULLTEXT01
  • 337.
    Gustafsson, Mats
    et al.
    Lund University.
    Cismasu, Marius
    Lund University.
    Nordebo, Sven
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Absorption Efficiency and Physical Bounds on Antennas2010In: International Journal of Antennas and Propagation, ISSN 1687-5869, E-ISSN 1687-5877, Vol. 2010, article id 946746Article in journal (Refereed)
    Abstract [en]

    The all spectrum absorption efficiency appears in the physical bounds on antennas expressed in the polarizability dyadics. Here, it is shown that this generalized absorption efficiency is close to 1/2 for small idealized dipole antennas and for antennas with a dominant resonance in their absorption. Also, the usefulness of this parameter is analyzed for estimation of antenna performance. The results are illustrated with numerical data for several antennas.

  • 338.
    Gustafsson, Stefan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Electromagnetic dispersion modeling and analysis for HVDC power cables2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Derivation of an electromagnetic model, regarding the wave propagation in a very long (10 km or more) High Voltage Direct Current (HVDC) power cable, is the central part of this thesis. With an existing “perfect” electromagnetic model there are potentially a wide range of applications.The electromagnetic model is focused on frequencies between 0 and 100 kHz since higher frequencies essentially will be attenuated. An exact dispersion relation is formulated and the propagation constant is computed numerically. The dominating mode is the first Transversal Magnetic (TM) mode of order zero, denoted TM01, which is also referred to as the quasi-TEM mode. A comparison is made with the second propagating TM mode of order zero denoted TM02. The electromagnetic model is verified against real time data from Time Domain Reflection (TDR) measurements on a HVDC power cable. A mismatch calibration procedure is performed due to matching difficulties between the TDR measurement equipment and the power cable regarding the single-mode transmission line model.An example of power cable length measurements is addressed, which reveals that with a “perfect” model the length of an 80 km long power cable could be estimated to an accuracy of a few centimeters. With the present model the accuracy can be estimated to approximately 100 m.In order to understand the low-frequency wave propagation characteristics, an exact asymptotic analysis is performed. It is shown that the behavior of the propagation constant is governed by a square root of the complex frequency in the lowfrequency domain. This thesis also focuses on an analysis regarding the sensitivity of the propagation constant with respect to some of the electric parameters in the model. Variables of interest when performing the parameter sensitivity study are the real relative permittivityand the conductivity.

    Download full text (pdf)
    fulltext
  • 339.
    Gustafsson, Stefan
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nordebo, Sven
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nilsson, Börje
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    An electromagnetic dispersion model for HVDC Power Cables2012Conference paper (Refereed)
  • 340.
    Gustafsson, Stefan
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nordebo, Sven
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nilsson, Börje
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Electromagnetic dispersion modeling and sensitivity analysis for HVDC power cables2012Report (Other academic)
    Abstract [en]

    This paper addresses electromagnetic wave propagation in High Voltage Direct Current (HVDC) power cables. An electromagnetic model, based on long (10 km or more) cables with a frequency range of 0 to 100 kHz, is derived. Relating the frequency to the propagation constant a dispersion relation is formulated using a recursive approach. The propagation constant is found numerically with normalized residue calculation. The paper is concluded with a sensitivity analysis of the propagation constant with respect to the electrical parameters εr (the real relative permittivity) and σ (the conductivity)

    Download full text (pdf)
    fulltext
  • 341.
    Gustavsson, Marcus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Hedbrant, Joel
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Webbserveranalys: En jämförelse av webbservrars svarstider2011Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Download full text (pdf)
    FULLTEXT01
  • 342.
    Gustavsson, Niklas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Johansson, Martin
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Leanderson, Prashant
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Social media: En kvalitativ studie av verksamheters professionella användning2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    Social Media - En kvalitativ undersökning av verksamheters professionella anvädning
  • 343.
    Gutzmann, Tobias
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Towards a Gold Standard for Points-to Analysis2010Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Points-to analysis is a static program analysis that computes reference informationfor a given input program. It serves as input to many client applicationsin optimizing compilers and software engineering tools. Unfortunately, the Gold Standard – i.e., the exact reference information for a given program– is impossible to compute automatically for all but trivial cases, and thus, little can been said about the accuracy of points-to analysis.

    This thesis aims at paving the way towards a Gold Standard for points-to analysis. For this, we discuss theoretical implications and practical challenges that occur when comparing results obtained by different points-to analyses. We also show ways to improve points-to analysis by different means, e.g., combining different analysis implementations, and a novel approach to path sensitivity.

    We support our theories with a number of experiments.

    Download full text (pdf)
    FULLTEXT01
  • 344.
    Gutzmann, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Collections Frameworks for Points-to Analysis2012In: IEEE 12th International Working Conference on Source Code Analysis and Manipulation (SCAM) 2012, IEEE, 2012, p. 4-13Conference paper (Refereed)
    Abstract [en]

    Points-to information is the basis for many analysesand transformations, e.g., for program understanding andoptimization. Collections frameworks are part of most modern programming languages’ infrastructures and used by many applications. The richness of features and the inherent structure of collection classes affect both performance and precision of points-to analysis negatively.

    In this paper, we discuss how to replace original collections frameworks with versions specialized for points-to analysis. We implement such a replacement for the Java Collections Framework and support its benefits for points-to analysis by applying it to three different points-to analysis implementations. In experiments, context-sensitive points-to analyses require, on average, 16-24% less time while at the same time being more precise. Context-insensitive analysis in conjunction with inlining also benefits in both precision and analysis cost.

  • 345.
    Gutzmann, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Feedback-driven Points-to Analysis2010Report (Other academic)
    Abstract [en]

    Points-to analysis is a static program analysis that extracts reference information from agiven input program. Its accuracy is limited due to abstractions that any such analysisneeds to make. Further, the exact analysis results are unknown, i.e., no so-called GoldStandard exists for points-to analysis. This hinders the assessment of new ideas to pointstoanalysis, as results can be compared only relative to results obtained by other inaccurateanalyses.

    In this paper, we present feedback-driven points-to analysis. We suggest performing(any classical) points-to analysis with the points-to results at certain programpoints guarded by a-priori upper bounds. Such upper bounds can come from other pointstoanalyses – this is of interest when different approaches are not strictly ordered in termsof accuracy – and from human insight, i.e., manual proofs that certain points-to relationsare infeasible for every program run. This gives us a tool at hand to compute very accuratepoints-to analysis and, ultimately, to manually create a Gold Standard.

    Download full text (pdf)
    FULLTEXT01
  • 346.
    Gutzmann, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Feedback-driven Points-to Analysis2011In: 26th Symposium On Applied Computing (SAC 2011), TaiChung, March 21-24, 2011, 2011Conference paper (Refereed)
    Abstract [en]

    In this paper, we present feedback-driven points-to analysis where any classical points-to analysis has its points-to results at certain program points guarded by a-priori upper bounds. Such upper bounds can come from other points-to analyses – this is of interest when different approaches are not strictlyordered in terms of accuracy – and from human insight, i.e., manual proofs that certain points-to relations are infeasible for every program run.

  • 347.
    Gutzmann, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Custom-made Instrumentation Based on Static Analysis2011In: WODA 2011: Ninth International Workshop on Dynamic Analysis, 2011, p. 18-23Conference paper (Refereed)
    Abstract [en]

    Many dynamic analysis tools capture the occurrences of events at runtime. The longer programs are being monitored, the more accurate the data they provide to the user. Then, the runtime overhead must be kept as low as possible, because it decreases the user's productivity. Runtime performance overhead occurs due to identifying events, and storing them in a result data-structure. We address the latter issue by generating custom-made instrumentation code for each program. By using static analysis to get a~priori knowledge about which events of interest can occur and where they can occur, tailored code for storing those events can be generated for each program. We evaluate our idea by comparing the runtime overhead of a general purpose dynamic analysis tool that captures points-to information for Java programs with approaches based on custom-made instrumentation code. Experiments suggest highly reduced performance overhead for the latter.

  • 348.
    Gutzmann, Tobias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Reducing the Performance Overhead of Dynamic Analysis through Custom-made Agents2010In: 5th International Workshop on Program Comprehension through Dynamic Analysis (PCODA 2010), 2010, p. 1-6Conference paper (Refereed)
    Abstract [en]

    The usefulness of dynamic analysis tools for programcomprehension increases with the amount oftime a given analyzed program is monitored. Thus, monitoring the analyzed program in a production environment should give the best picture of how the program actually works. However, high performance overhead is especially undesirable in such a setting, because it decreases the user’s productivity. Performance overhead occurs due to recognizing events that are of interest to the agent monitoring the program run and storing those events in data-structures. We propose to address this issue by creating a custom-made agent for each program. By using static analysis to get a priori knowledge about which events of interest can occur and where they can occur, tailored code for recognizing and storing those events can be generated for each program. We evaluate our idea by comparing a "general purpose" dynamic agent that captures fine-grained points-to information with custom-made agents that do the same job for specific programs. The latter show highly reduced performance overhead in practice. We also investigate how the precision of the static analysis affects the performance of the custom-made agents.

  • 349.
    GÜNAŞTI, Gökmen
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Quaternions Algebra, Their applications in Rotations and Beyond Quaternions2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The theory of quaternions was discovered in the middle of nineteenth century and they were commonly used to represent rotations.This thesis is written to review the basic properties of quaternions algebra and their applications in representing rotation of a body in 3-dimensional Euclidean space. Also, last sections in this thesis explore why the use of quaternions are more advantages than Euler angle sequences and can quaternions themselves be further generalized to another number systems?

    Download full text (pdf)
    fulltext
  • 350.
    Haftor, Darek
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    From Onto-Syntactic to Phenomeno-Semantic Complexity: A foundation for the management of managerial complexity2005In: 11th ANZSYS Conference on Managing the Complex: Systems Thinking and Complexity Science - Insights for Action., New Zealand, 2005Conference paper (Refereed)
45678910 301 - 350 of 1204
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf