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  • 2501. Zhang, Peng
    Knowledge Integrated Agent Technology with CommonKADS2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper is organized around three questions: (1) is knowledge a necessary entity in Agent Systems? (2) What is the problem for individual knowledge intensive agents to cooperate? (3) Provide a possible methodology for design and implement a knowledge intensive agent. Knowledge is considered to be only emerging during the process when agents coordinate, but not an individually possessed entity by some researchers. Some other researchers consider knowledge as a starting point, a given entity that is part of the notion of an intelligent agent, and focus on knowledge acquisition, inference and communication. The paper will first have a discussion on this topic from an angle of Activity Theory. Then we have a discussion of the ontology sharing problems in MultiAgent Systems (MAS), based on the Distributed Collective Memory. Finally we introduce a methodology to build a knowledge intensive agent system.

  • 2502. Zhang, Peng
    Multi-agent Systems in Diabetic Health Care2005Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis discusses how Multi-agent Systems (MAS) should be designed in the context of diabetic health care. Three fields are touched: computer science, socio-psychology and systems science. Agent Technology is the core technology in the research. Theories from socio-psychology and systems science are applied to facilitate the discussion about computer agents. As the integration of socio-psychology and systems science, Activity Systems Theory is introduced to give a synthesized description of MAS. Laws and models are introduced with benefits on both individual agent and agent communities. Cybernetics from systems science and knowledge engineering from computer science are introduced to approach the design and implementation of the individual agent architecture. A computer agent is considered intelligent if it is capable of reactivity, proactivity and social activity. Reactivity and proactivity can be realized through a cybernetic approach. Social activity is much more complex, since it considers MAS coordination. In this thesis, I discuss it from the perspectives of socio-psychology. The hierarchy and motivation thinking from Activity Systems Theory is introduced to the MAS coordination. To behave intelligent, computer agents should work with knowledge. Knowledge is considered as a run-time property of a group of agents (MAS). During the MAS coordination, agents generate new information through exchanging the information they have. A knowledge component is needed in agent’s architecture for the knowledge related tasks. In my research, I adopt CommonKADS methodology for the design and implementation of agent’s knowledge component. The contribution of this research is twofold: first, MAS coordination is described with perspectives from socio-psychology. According to Activity Systems Theory, MAS is hierarchically organized and driven by the motivation. This thesis introduces a motivation-driven mechanism for the MAS coordination. Second, the research project Integrated Mobile Information Systems for health care (IMIS) indicates that the diabetic health care can be improved by introducing agent-based services to the care-providers and care-receivers. IMIS agents are designed with capabilities of information sharing, organization coordination and task delegation. To perform these tasks, the IMIS agents interact with each other based on the coordination mechanism that is discussed above.

  • 2503.
    Zhang, Peng
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Multi-Agent Systems Supported Collaboration in Diabetic Healthcare2008Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis proposes a holistic and hierarchical architecture to Multi-agent System design, in order to resolve the collaboration problem in diabetic healthcare system. A diabetic healthcare system is a complex and social system in the case that it involves many actors and interrelations. Collaborations among various healthcare actors are vital to the quality of diabetic healthcare. The collaboration problem is manifested by the problems of accessibility and interoperability. To support the collaboration in diabetic healthcare as such a complex and social system, the MAS must have corresponding social entities and relationships. Therefore, it is assumed that theories explaining social activity can be applied to design of MAS. Activity Theory, specifically its holistic triangle model from Engström and hierarchy thinking, provides theoretical supports to the design of individual agent architecture and MAS coordination mechanism. It is argued that the holistic and hierarchical aspects should be designed in a MAS when applied to the healthcare setting. The diabetic healthcare system is analyzed on three levels based on the hierarchy thinking. The collaboration problem is analyzed and resolved via MAS coordination. Based on the holistic activity model in Activity Theory, Müller’s Vertical Layered Architecture is re-conceptualized in the Control Unit and Knowledge Base design. It is also argued that autonomy, adaptivity and persona should be especially focused when designing the interaction between an agent system and human users. This study has firstly identified some important social aspects and the technical feasibility of embedding those identified social aspects in agent architecture design. Secondly, a MAS was developed to illustrate how to apply the proposed architecture to design a MAS to resolve the collaboration problem in diabetic healthcare system. We have designed and implemented an agent system – IMAS (Integrated Multi-agent System) to validate the research questions and contributions. IMAS system provides real time monitoring, diabetic healthcare management and decision supports to the diabetic healthcare actors. A user assessment has been conducted to validate that the quality of the current diabetic healthcare system can be improved with the introduction of IMAS.

  • 2504. Zhang, Peng
    et al.
    Bai, Guohua
    A Cybernetic Architecture of Practical Reasoning Agent2003Konferansepaper (Fagfellevurdert)
    Abstract [en]

    During the last ten years, agent technology has been widely discussed in various research areas. An agent is a computer system that is situated in some environment, and that is capable of autonomous actions in this environment in order to meet its design objectives. There are at least two kinds of reasoning methods applied in constructing an agent, namely practical reasoning and theoretical reasoning. Practical reasoning directed towards actions – the process of figuring out what to do by weighing different acting options against with agent desires and believes. While theoretical reasoning is directed towards beliefs. In this paper, we just focus on practical reasoning. A widely used BDI model for practical reasoning agent will be introduced, based on which our cybernetic-BDI architecture is discussed. ‘Intelligence’ and ‘autonomy’ are perhaps the most important aspects of agent system. Attempts to model intelligent behaviors of an agent, especially a practical reasoning agent, have been made from areas of computer sciences, psychology, sociology, and many others. Cybernetics provides a concrete mechanism for this purpose, namely by ‘feedback’, ‘feedforward’, and ‘sociocybernetics’. We discuss first intelligent behaviors of agent systems in terms of reactivity, proactity, and social ability based on cybernetic concepts of feedback, feedforward, and sociocybernetics. Then based on the Belief-Desire-Intention (BDI) model and cybernetic principles we build up our Cybernetic-BDI architecture. With a pseudocode we validate the architecture for its practical implementation and fulfillment of required intelligent behaviors. In the last, a scenario of healthcare agent for diabetes patients is provided to show how the agent works according to the Cybernetic-BDI architecture.

  • 2505.
    Zhang, Peng
    et al.
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Bai, Guohua
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    An Activity Systems Theory Approach to Agent Technology2005Inngår i: International Journal of Knowledge and Systems Sciences, ISSN 1349-7030, Vol. 2, nr 1, s. 60-65Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the last decade, Activity Theory has been discussed a lot in Human-Computer Interaction (HCI) and Computer Supported Cooperative Work (CSCW). Activity Theory was used both theoretically as an analytical method and practically as a development framework for Information Systems. Meanwhile, there is a new trench from Artificial Intelligence. Artificial Intelligence researchers find that the fruit from Activity Theory study may contribute, especially to Agent Technology, with socio-psychological aspects. In our E-health research, we apply Activity Theory both theoretically and practically into Agent Technology. To facilitate our research, General Systems Theory is chosen to integrate Activity Theory and Agent Technology. On the one hand, we consider Activity Theory as specific subject of General Systems Theory. On the other hand, General Systems Theory contributes to Agent Technology with systematic perspectives. As integration, we introduce Activity Systems Theory as an extension of Activity Theory. Then we apply it into Agent Technology discussion. The paper starts with the discussion of systematic perspectives of Activity Theory. Then we introduce Activity Systems Theory as an integration of systems science and Activity Theory. Three Activity Systems Theory principles are then applied into the discussion of Agent Technology. In the end, we introduce how we apply Activity Systems Theory into an E-health application.

  • 2506.
    Zhang, Peng
    et al.
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Bai, Guohua
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Systemic Thinking in Multi-agent Systems Coordination – Applied in Diabetic Health Care2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Computer agent is considered as a technology that may support human beings with automatic functionalities in the social environment. This paper describes an approach to applying agents to diabetic health care. A good health care agent is considered to be able to keep a good balance between individual flexibility and team control. A systemic approach is proposed hereby as a complementation to the current approaches. Multi-agent Systems (MAS) coordination is considered on three levels: collaboration, coordination and communication. In the end, an agent-based computer system – Integrated Mobile Information Systems (IMIS) – is discussed based on the systemic approach.

  • 2507.
    Zhang, Peng
    et al.
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Bai, Guohua
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Carlsson, Bengt
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Johansson, Stefan J.
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för för interaktion och systemdesign.
    Applying Multi-agent Systems Coordination to the Diabetic Healthcare Collaboration2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Diabetic healthcare is characterized by the collaboration problem, which is manifested by problems of accessibility and interoperability. To improve the problem situation, we propose a Multi-agent Systems approach. The interactions among the diabetic healthcare actors are categorized on three levels: collaboration, coordination, and communication. Agents are designed to work on the coordination and communication levels, and support the collaboration among human actors. This paper presents a project Integrated Mobile Information Systems for diabetic healthcare (IMIS) to demonstrate how to apply Multi-agent Systems coordination to the collaboration among healthcare actors.

  • 2508. Zhang, Peng
    et al.
    Carlsson, Bengt
    Johansson, Stefan J.
    Enhance Collaboration in Diabetic Healthcare for Children using Multi-agent Systems2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We developed a multi-agent platform as a complement to the existing healthcare system in a children’s diabetic healthcare setting. It resolves problems related to the difficulty of collaboration between the stakeholders of the problem domain. In addition, it gives us an opportunity to support the decision making of the stakeholders using Multi-agent Systems. The collaboration situation is believed to be improved by the agent-based services, such as, diabetes monitoring and alarm, scheduling, and task delegation.

  • 2509.
    Zhang, Yiran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Liu, Xiaohui
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Design of Eco-Smart Homes For Elderly Independent Living2015Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    The aging of the world population has increased dramatically during the past century. The rapid increase of elderly population is putting a heavy strain on healthcare and social welfare. Living conditions and service provision for elderly people have thus become an increasingly hot topic worldwide. In this paper, we address this problem by presenting a conceptual model of an integrated and personalized system for an eco-smart home for elderly independent living. This approach was inspired by an on-going European project, INNOVAGE, which researchers at Blekinge Institute of Technology are currently participating in, and which focuses on regional knowledge clusters for promoting eco-smart homes for elderly independent living. Contrasting the social situation of elderly in China and Europe, we have chosen to focus on a solution for a Swedish context, which takes technical, environmental, social and human-computer interaction aspects into consideration in the design of eco-smart homes for elderly people in Sweden. Three studies have been carried out in order to clarify and explore the main issues at stake. A literature review gave an overview of on-going research and the current state-of-the-art concerning smart homes. The literature review, along with an interview of an expert on solar energy, also gave insights into additional design challenges which are introduced when focusing specifically on eco-smart building solutions. In order to explore and gain a better understanding of the perceived needs and requests of the target group, i.e. the elderly population, we carried out interviews with three experts in healthcare and homecare for the elderly, and also carried out interviews among the elderly in Karlskrona and interviews and a web survey among the elderly in China. As a way of addressing the design challenges of integrating a multitude of diverse, complicated technical systems in a home environment while at the same time high-lighting the need for comprehensive personalized service provision for elderly people, we designed a conceptual model – an exemplar – of an eco-smart home for elderly independent living. The eco-smart home exemplar aims to inspire interdisciplinary and multi-stakeholder discussions around innovative design and development of environmentally friendly, comfortable, safe and supportive living for the elderly in the future. Finally, we did an evaluation of the model in two workshops with elderly people in two different towns in Blekinge.

  • 2510. Zhao, Haifeng
    et al.
    Kallander, William
    Gbedema, Tometi
    Johnson, Henric
    Wu, Felix
    Read what you trust: An open wiki model enhanced by social context2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Wiki systems, such as Wikipedia, provide a multitude of opportunities for large-scale online knowledge collaboration. Despite Wikipedia's successes with the open editing model, dissenting voices give rise to unreliable content due to conflicts amongst contributors. From our perspective, the conflict issue results from presenting the same knowledge to all readers, without regard for the importance of the underlying social context, which both reveals the bias of contributors and influences the knowledge perception of readers. Motivated by the insufficiency of the existing knowledge presentation model for Wiki systems, this paper presents TrustWiki, a new Wiki model which leverages social context, including social background and relationship information, to present readers with personalized and credible knowledge. Our experiment shows, with reliable social context information, TrustWiki can efficiently assign readers to their compatible editor community and present credible knowledge derived from that community. Although this new Wiki model focuses on reinforcing the neutrality policy of Wikipedia, it also casts light on the other content reliability problems in Wiki systems, such as vandalism and minority opinion suppression.

  • 2511. Zhao, Haifeng
    et al.
    Kallander, William
    Johnson, Henric
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Wu, Felix
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    SmartWiki: A reliable and conflict-refrained Wiki model based on reader differentiation and social context analysis2013Inngår i: Knowledge-Based Systems, ISSN 0950-7051, E-ISSN 1872-7409, Vol. 47, s. 53-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wiki systems, such as Wikipedia, provide a multitude of opportunities for large-scale online knowledge collaboration. Despite Wikipedia's successes with the open editing model, dissenting voices give rise to unreliable content due to conflicts amongst contributors. Frequently modified controversial articles by dissent editors hardly present reliable knowledge. Some overheated controversial articles may be locked by Wikipedia administrators who might leave their own bias in the topic. It could undermine both the neutrality and freedom policies of Wikipedia. As Richard Rorty suggested "Take Care of Freedom and Truth Will Take Care of Itself"[1], we present a new open Wiki model in this paper, called TrustWiki, which bridge readers closer to the reliable information while allowing editors to freely contribute. From our perspective, the conflict issue results from presenting the same knowledge to all readers, without regard for the difference of readers and the revealing of the underlying social context, which both causes the bias of contributors and affects the knowledge perception of readers. TrustWiki differentiates two types of readers, "value adherents" who prefer compatible viewpoints and "truth diggers" who crave for the truth. It provides two different knowledge representation models to cater for both types of readers. Social context, including social background and relationship information, is embedded in both knowledge representations to present readers with personalized and credible knowledge. To our knowledge, this is the first paper on knowledge representation combining both psychological acceptance and truth reveal to meet the needs of different readers. Although this new Wiki model focuses on reducing conflicts and reinforcing the neutrality policy of Wikipedia, it also casts light on the other content reliability problems in Wiki systems, such as vandalism and minority opinion suppression.

  • 2512. Zhi, Tao
    et al.
    Zhang, Xia-Jun
    Zhao, He-Ming
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Noise reduction in whisper speech based on the auditory masking model2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the issue of whispered speech enhancement. Based on multi-band spectral subtraction method where the introduced musical residual noise occurs, the proposed approach performs parametric subtraction according to the WSS (Whispered Sensitive Scale) method that is particular for whispered speech processing and auditory masking model. The algorithm is characterized by a tradeoff mechanism between the amount of the whispered speech distortion, noise reduction, and the level of musical residual noise, which are determined by appropriate adjusting the subtraction parameters. Compared with traditional subtractive-type algorithms, the proposed method results in a significant reduction of musical residual noise. Finally, objective and subjective evaluations are implemented illustrating the improvements over traditional subtractive-type algorithms.

  • 2513. Zhou, Kaibo
    et al.
    Liu, Gang
    Yao, Yong
    Popescu, Adrian
    A Mobility Management Solution for Simultaneous Mobility with mSCTP2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The paper is about mobile Stream Control Transmission Protocol (mSCTP) and the problems related to simultaneous mobility. Simultaneous mobility is when the both endpoints of a communication session are mobile and they move at about the same time. mSCTP works well in the case of non-simultaneous mobility where the SCTP association is established between a mobile endpoint and a stationary one. In the case of simultaneous mobility however, the probability of broken association may become high because both endpoints may suffer from losing address binding update. This is a consequence of the fact that the targeted addresses become unreachable. In this paper, we suggest a solution based on Host Name Address (HNA), together with pro-active Name Server, Address Handling Function (AHF) and Simultaneous Mobility Detection Function (SMDF) to eliminate this problem. Our preliminary results show that the performance of our solution is as good as for non-simultaneous mobility situation in terms of packet loss rate for low rate stream. On the other hand, the drawback is that some modifications to the current standard mSCTP are needed.

  • 2514.
    Zieba, Maciej
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Multistage neural networks for pattern recognition2009Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    In this work the concept of multistage neural networks is going to be presented. The possibility of using this type of structure for pattern recognition would be discussed and examined with chosen problem from eld area. The results of experiment would be confront with other possible methods used for the problem.

  • 2515. Zinner, T.
    et al.
    Hossfeld, T.
    Fiedler, Markus
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Liers, F.
    Volkert, T.
    Kohndoker, R.
    Schatz, R.
    Requirement driven prospects for realizing user-centric network orchestration2015Inngår i: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721, Vol. 74, nr 2, s. 413-437Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Internet's infrastructure shows severe limitations when an optimal end user experience for multimedia applications should be achieved in a resource-efficiently way. In order to realize truly user-centric networking, an information exchange between applications and networks is required. To this end, network-application interfaces need to be deployed that enable a better mediation of application data through the Internet. For smart multimedia applications and services, the application and the network should directly communicate with each other and exchange information in order to ensure an optimal Quality of Experience (QoE). In this article, we follow a use-case driven approach towards user-centric network orchestration. We derive user, application, and network requirements for three complementary use cases: HD live TV streaming, video-on-demand streaming and user authentication with high security and privacy demands, as typically required for payed multimedia services. We provide practical guidelines for achieving an optimal QoE efficiently in the context of these use cases. Based on these results, we demonstrate how to overcome one of the main limitations of today's Internet by introducing the major steps required for user-centric network orchestration. Finally, we show conceptual prospects for realizing these steps by discussing a possible implementation with an inter-network architecture based on functional blocks.

  • 2516. Zinner, Thomas
    et al.
    Hossfeld, Tobias
    Minhas, Tahir Nawaz
    Fiedler, Markus
    Controlled vs. Uncontrolled Degradations of QoE: The Provisioning-Delivery Hysteresis in Case of Video2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper applies the recently proposed provisioning-delivery hysteresis for Quality of Experience (QoE) to the case of video. The study is based on evaluations using the Structural Similarity Metric (SSIM) for different versions of a video in terms of resolution on one hand, and suffering from different packet loss ratios on the other hand. Upon translation of the SSIM into MOS, the QoE plotted versus the effective throughput shows the predicted behaviour: a controlled quality and throughput reduction leads to a better user perceived quality than the quality degradation due to packet loss. The results clearly quantify the necessity to control quality, instead of "getting hit" in an uncontrolled way.

  • 2517.
    Zou, Ming
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datalogi och datorsystemteknik.
    Industrial Decision Support System with Assistance of 3D Game Engine2015Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Context. Industrial Decision Support System(DSS) traditionally relies on 2D approach to visualize the scenarios. For some abstract information, like chronological sequence of tasks or data trend, it provides a good visualization. For concrete information, such as location and spatial relationships, 2D visualizations are too abstract. Techniques from Game design, 3D modeling, virtual reality(VR) and animation provides many inspiration to develop a DSS tools for industrial applications. Objectives. The work in our research was to develop a unique prototype for data visualization in wind power systems, and compare it with traditional ones. The product combined 3D VR, 2D graphics, user navigation, and Human Machine Interaction(HMI). It was developed with a game engine, Unity3D. The study explored how much usability can be improved when using applied gamificaion 3D approaches in industrial monitoring and control systems. Methods. The research methods included Literature Review, Commercial Example Analysis, Development, and Evaluation. In the evaluation phase, Systematic Usability Scale(SUS) tests were performed with two independent groups, the testing results were analyzed with statistical method, t-test. Results. The evaluation results showed that an interface developed with 3D virtual reality can provide better usability(include learnability) than traditional 2D industrial interface in wind power system. The difference between them is significant. Conclusions. The study indicates that, compared with the traditional 2D interfaces, the gamification 3D approach in industrial DSS can provide user more comprehensive information visualization, better usability and learnability . It also gives more effective interactions to enhance the user experience.

  • 2518.
    Álvarez, Carlos García
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Overcoming the Limitations of Agile Software Development and Software Architecture2013Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Context. Agile Software Development has provided a new concept of Software Development based in adaptation to changes, quick decisions, low high-level design and frequent deliveries. However, this approach ignores the value that Software Architecture provides in the long term for increasing the speed in delivery working software, which may have catastrophic consequences in the long term. Objectives. In this study, the combination of these two philosophies of Software Development is investigated. Firstly, the concept of Software Architecture in Agile Projects; then, the major challenges faced concerning Software Architecture in Agile Projects, the practices and approaches that can be used to overcome these challenges and the effects that these practices may cause on the project. Methods. The research methodologies used in this study are Systematic Literature Review for gathering the highest amount possible of contributions available in the Literature at this respect, and also the conduction of Semi-Structured Interviews with Agile Practitioners, in order to obtain empirical knowledge on the problem and support or deny the SLR findings. Results. The results of the Thesis are a unified description of the concept of Software Architecture in Agile Projects, and a collection of challenges found in agile projects, practices that overcome them and a relation of effects observed. Considering the most frequent practices/approaches followed and the empirical support, it is enabled a discussion on how to combine Software Architecture and Agile Projects. Conclusions. The main conclusion is that there is not a definite solution to this question; this is due to the relevance of the context (team, project, customer, etc.) that recommends the evaluation of each situation before deciding the best way to proceed. However, there are common trends on the best-recommended practices to integrate these two concepts. Finally, it is required more empirical work on the issue, the conduction of controlled experiments that allows to quantify the success or failure of the practices implemented would be most helpful in order to create a body of knowledge that enables the application of certain practices under certain conditions.

  • 2519. Åberg, Hampus
    Subimage matching in historical documents using SIFT keypoints and clustering2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Context: In this thesis subimage matching in historical handwritten documents using SIFT (Scale-Invariant Feature Transform) keypoints was tested. SIFT features are invariant to scale and rotation and have gained a lot of interest in the research community. The historical documents used in this thesis orignates from 16th century and forward. The following steps have been executed; binarization, word segmentation, feature identification and clustering. The binarization step converts the images into binary images. The word segmentation separates the different words into individual subimages. In the feature identification SIFT keypoints was found and descriptors was computed. The last step was to cluster the images based on the distances between the set of image features identified. Objectives: The main objectives are to find a good configuration for the binarization step, implement a good word segmentation, identify image features and lastly to cluster the images based on their similarity. The context from subimages are matched to each other rather than trying to predict what the context of a subimage is, simply because the data that has been used is unlabeled. Methods: Implementation were the main methodology used combined with experimentation. Measurements were taken throughout the development and accuracy of word segmentation and the clustering is measured. Results: The word segmentation got an average accuracy of 89\% correct segmentation which is comparable to other word segmentating results. The clustering however matched 0% correctly.Conclusions: The conclusions that have been drawn from this study is that SIFT keypoints are not very well suited for this type of problem which includes a lot of handwritten text. The descriptors were not discriminative enough and different keypoints were found in different images with the same handwritten text, which lead to the bad clustering results.

  • 2520. Ådahl, Kerstin
    et al.
    Gustavsson, Rune
    Innovative Health Care Channels: Towards Declarative Electronic Decision Support Systems Focusing on Patient Security.2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Models supporting empoerment of health care teams and patients are introduced and exemplified

  • 2521.
    Åkesson, Gustav
    et al.
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Rantzow, Pontus
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Performance evaluation of multithreading in a Diameter Credit Control Application2010Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    Moore's law states that the amount of computational power available at a given cost doubles every 18 months and indeed, for the past 20 years there has been a tremendous development in microprocessors. However, for the last few years, Moore's law has been subject for debate, since to manage heat issues, processor manufacturers have begun favoring multicore processors, which means parallel computation has become necessary to fully utilize the hardware. This also means that software has to be written with multiprocessing in mind to take full advantage of the hardware, and writing parallel software introduces a whole new set of problems. For the last couple of years, the demands on telecommunication systems have increased and to manage the increasing demands, multiprocessor servers have become a necessity. Applications must fully utilize the hardware and such an application is the Diameter Credit Control Application (DCCA). The DCCA uses the Diameter networking protocol and the DCCA's purpose is to provide a framework for real-time charging. This could, for instance, be to grant or deny a user's request of a specific network activity and to account for the eventual use of that network resource. This thesis investigates whether it is possible to develop a Diameter Credit Control Application that achieves linear scaling and the eventual pitfalls that exist when developing a scalable DCCA server. The assumption is based on the observation that the DCCA server's connections have little to nothing in common (i.e. little or no synchronization), and introducing more processors should therefore give linear scaling. To investigate whether a DCCA server's performance scales linearly, a prototype has been developed. Along with the development of the prototype, constant performance analysis was conducted to see what affected performance and server scalability in a multiprocessor DCCA environment. As the results show, quite a few factors besides synchronization and independent connections affected scalability of the DCCA prototype. The results show that the DCCA prototype did not always achieve linear scaling. However, even if it was not linear, certain design decisions gave considerable performance increase when more processors were introduced.

  • 2522.
    Åleskog, Christoffer
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datavetenskap.
    Ljungberg Fayyazuddin, Salomon
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datavetenskap.
    Comparing node-sorting algorithms for multi-goal pathfinding with obstacles2019Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Background. Pathfinding plays a big role in both digital games and robotics, and is used in many different ways. One of them is multi-goal pathfinding (MGPF) which is used to calculate paths from a start position to a destination with the condition that the resulting path goes though a series of goals on the way to the destination. For the most part research on this topic is sparse, and when the complexity is increased through obstacles that are introduced to the scenario, there are only a few articles in the field that relate to the problem.Objectives. The objective in this thesis is to conduct an experiment to compare four algorithms for solving the MGPF problem on six different maps with obstacles, and then analyze and draw conclusions on which of the algorithms is best suited to use for the MGPF problem. The first is the traditional Nearest Neighbor algorithm, the second is a variation on the Greedy Search algorithm, and the third and fourth are variations on the Nearest Neighbor algorithm. Methods. To reach the Objectives all the four algorithms are tested fifty times on six different maps of varying sizes and obstacle layout. Results. The data from the experiment is compiled in graphs for all the different maps, with the time to calculate a path and the path lengths as the metrics. The averages of all the metrics are put in tables to visualize the difference between the results for the four algorithms.Conclusions. The conclusions were that the dynamic version of the Nearest Neighbor algorithm has the best result if both the metrics are taken into account. Otherwise the common Nearest Neighbor algorithm gives the best results in respect to the time taken to calculate the paths and the Greedy Search algorithm creates the shortest paths of all the tested algorithms.

  • 2523.
    Årsköld, Martin
    Blekinge Tekniska Högskola, Institutionen för arbetsvetenskap och medieteknik.
    Processoperatörens mobilitet -teknikstöd för mobil larmhantering2002Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [sv]

    Processindustrin har möjligheten att ta steget in i en ny utvecklingsfas där teknik kommer att spela stor roll. I och med att teknik allt mer stödjer mobilitet öppnas möjligheten för processoperatörer att på valfri plats kunna övervaka och styra tillverkningsprocessen. Med denna rapport presenterar författaren sin empiriska studie på en högteknologisk fabrik. Studiens fokus ligger i betydelsen av processoperatörernas mobilitet och hur den framträder i deras arbete. Studien visar att mobilitet för operatörerna på fabriken är en del av deras yrkesutövande och väsentlig för att kunna styra tillverkningsprocessen. Utifrån studien ges förslag på teknik som kan stödja denna mobilitet genom att möjliggöra mobil larmhantering.

  • 2524.
    Åström, Fredrik
    Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation.
    Neural Network on Compute Shader: Running and Training a Neural Network using GPGPU2011Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    In this thesis I look into how one can train and run an artificial neural network using Compute Shader and what kind of performance can be expected. An artificial neural network is a computational model that is inspired by biological neural networks, e.g. a brain. Finding what kind of performance can be expected was done by creating an implementation that uses Compute Shader and then compare it to the FANN library, i.e. a fast artificial neural network library written in C. The conclusion is that you can improve performance by training an artificial neural network on the compute shader as long as you are using non-trivial datasets and neural network configurations.

  • 2525.
    Örtegren, Kevin
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    Clustered Shading: Assigning arbitrarily shaped convex light volumes using conservative rasterization2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Context. In this thesis, a GPU-based light culling technique performed with conservative rasterization is presented. Accurate lighting calculations are expensive in real-time applications and the number of lights used in a typical virtual scene increases as real-time applications become more advanced. Performing light culling prior to shading a scene has in recent years become a vital part of any high-end rendering pipeline. Existing light culling techniques suffer from a variety of problems which clustered shading tries to address.

    Objectives. The main goal of this thesis is to explore the use of the rasterizer to efficiently assign convex light shapes to clusters. Being able to accurately represent and assign light volumes to clusters is a key objective in this thesis.

    Methods. This method is designed for real-time applications that use large amounts of dynamic and arbitrarily shaped convex lights. By using using conservative rasterization to assign convex light volumes to a 3D cluster structure, a more suitable light volume approximation can be used. This thesis implements a novel light culling technique in DirectX 12 by taking advantage of the hardware conservative rasterization provided by the latest consumer grade Nvidia GPUs. Experiments are conducted to prove the efficiency of the implementation and comparisons with AMD´s Forward+ tiled light culling are provided to relate the implementation to existing techniques.

    Results. The results from analyzing the algorithm shows that most problems with existing light culling techniques are addressed and the light assignment is of high quality and allows for easy integration of new convex light types. Assigning the lights and shading the CryTek Sponza scene with 2000 point lights and 2000 spot lights takes 2.92ms on a GTX970.

    Conclusions. The conclusion shows that the main goal of the thesis has been reached to the extent that all existing problems with current light culling techniques have been solved, at the cost of using more memory. The technique is novel and a lot of future work is outlined and would benefit the validity of the implementation if further researched.

  • 2526. Östlund, Louise
    Information in use: In- and outsourcing aspects of digital services2007Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis is founded on the global growth of the service sector and its significance for society as a whole and for the individual human being. In the last decade, technology has changed the way services are created, developed and delivered in remarkable ways. The focus of the thesis is technology in interplay with humans and organisations and the socio-economic-technical systems in which digital services play a central role. Challenges addressed by the thesis include requirement analysis, trustworthy systems, in- and outsourcing aspects, the proper understanding of information and its use in real world applications. With this in mind, the thesis presents a configurable methodology with the purpose to quality assure service oriented workflows found in socio-economic-technical systems. Important building blocks for this are information types and service supported workflows. Our case study is of a call centre-based business called AKC (Apotekets kundcentrum). AKC constitutes a part of the Cooperation of Swedish Pharmacies (Apoteket AB). One of their main services offered to Swedish citizens is the handling of incoming questions concerning pharmaceutical issues. We analysed the interactive voice response system at AKC as a starting point for our investigations and we suggest a more flexible solution. We regard a socio-economic-technical system as an information ecology, which puts the focus on human activities supported by technology. Within these information ecologies, we have found that a Service Oriented Architecture (SOA) can provide the flexible support needed in an environment with a focal point on services. Input from information ecologies and SOA also enables a structured way of managing in- and outsourcing issues. We have also found that if we apply SOA together with our way of modelling a Service Level Agreement (SLA), we can coordinate high-level requirements and support-system requirements. A central insight in this work is the importance of regarding a socio-economic-technical system as an information ecology in combination with in- and outsourcing issues. This view will prevent a company from being drained of its core competences and core services in an outsourcing situation, which is further discussed in the thesis. By using our combination of SOA and SLA we can also divide service bundles into separate services and apply economic aspects to them. This enables us to analyse which services that are profitable while at the same time meet important requirements in information quality. As a result, we propose a set of guidelines which represent our approach towards developing quality assured systems. We also present two main types of validation for service oriented workflows: validation of requirement engineering and validation of business processes.

  • 2527.
    Özcan, Mehmet Batuhan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Iro, Gabriel
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    PARAVIRTUALIZATION IMPLEMENTATION IN UBUNTU WITH XEN HYPERVISOR2014Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    With the growing need for efficiency, cost reduction, reduced disposition of outdated electronics components as well as scalable electronics components, and also reduced health effects of our daily usage of electronics components. Recent trend in technology has seen companies manufacturing these products thinking in the mentioned needs when manufacturing and virtualizations is one important aspect of it. The need to share resources, the need to use lesser workspace, the need to reduce cost of purchase and manufacturing are all part of achievements of virtualization techniques. For some people, setting up a computer to run different virtual machines at the same time can be difficult especially if they have no prior basic knowledge of working in terminal environment and hiring a skilled personnel to do the job can be expensive. The motivation for this thesis is to help people with little or no basic knowledge on how to set up virtual machine with Ubuntu operating system on XEN hypervisor.

  • 2528.
    Özgür, Turhan
    Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för programvarusystem.
    Comparison of Microsoft DSL Tools and Eclipse Modeling Frameworks for Domain-Specific Modeling in the context of Model-Driven Development2007Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    Today it is realized by industry that automation of software development leads to increased productivity, maintainability and higher quality. Model-Driven Development (MDD) aims to replace manual software development methods by automated methods using Domain-Specific Languages (DSLs) to express domain concepts effectively. Main actors in software industry, Microsoft and IBM have recognized the need to provide technologies and tools to allow building DSLs to support MDD. On the one hand, Microsoft is building DSL Tools integrated in Visual Studio 2005; on the other hand IBM is contributing to the development of Eclipse Modeling Frameworks (EMF/GEF/GMF), both tools aim to make development and deployment of DSLs easier. Software practitioners seek for guidelines regarding how to adopt these tools. In this thesis, the author presents the current state-of-the-art in MDD standards and Domain-Specific Modeling (DSM). Furthermore, the author presents current state-of-the-tools for DSM and performs a comparison of Microsoft DSL Tools and Eclipse EMF/GEF/GMF Frameworks based on a set of evaluation criteria. For the purpose of comparison the author developed two DSL designers (one by using each DSM tool). Based on the experiences gained in development of these DSL designers, the author prepared guidelines regarding how to adopt these tools to existing development environments as well as their advantages and drawbacks.

48495051 2501 - 2528 of 2528
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