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  • 46401.
    Weerasekera, Roshan
    et al.
    KTH, Tidigare Institutioner, Elektroniksystemkonstruktion.
    Zheng, Li-Rong
    KTH, Tidigare Institutioner, Elektroniksystemkonstruktion.
    Pamunuwa, Dinesh
    Tenhunen, Hannu
    KTH, Tidigare Institutioner, Elektroniksystemkonstruktion.
    Crosstalk immune interconnect driver design2004Ingår i: 2004 International Symposium On System-On-Chip, Proceedings / [ed] Nurmi, J; Takala, J; Hamalainen, TD, 2004, s. 139-142Konferensbidrag (Refereegranskat)
    Abstract [en]

    The effect of crosstalk noise becomes increasingly significant as geometries continue to shrink into the deep sub-micrometer regime and clock frequency increases into the multi GHz domain. Dynamic delay caused by coupling capacitance between adjacent interconnections is a critical problem, as it cannot accurately be estimated in static timing analysis. This paper presents a new driver circuit scheme called the Crosstalk Immune Interconnect Driver (XTIID), for capacitively coupled interconnects, which eliminates pattern-dependent coupling noise. Also, such an interconnect drive technology has the potential to facilitate the dynamic timing problem in deep submicrometer VLSI design.

  • 46402.
    Weerasekera, Thusitha R.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Zheng, Li-Rong
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Pamunuwa, Dinesh
    Lancaster University, United Kingdom .
    Tenhunen, Hannu
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Switching sensitive driver circuit to combat dynamic delay in on-chip buses2005Ingår i: Integrated Circuit and System Design: Power and Timing Modeling, Optimization and Simulation / [ed] Paliouras, V; Vounckx, J; Verkest, D, Springer, 2005, Vol. 3728, s. 277-285Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, we propose a novel Interconnect Driver circuit scheme for on-chip bus structures, which changes it's drive strength based on the switching pattern of the neighbouring interconnect. The circuit is quite simple compared to driver circuits proposed in the literature. The results show that for the cost of a few transistors, the proposed driver circuit has a wider eye opening (upto a 100% improvement) and reduced jitter (up to a 32% reduction) than a traditional driver for typical DSM technologies.

  • 46403.
    Weerasinghe, Thushani A.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Colombo, Sri Lanka.
    Hewagamge, Kamalanath
    University of Colombo, Sri Lanka.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Re-evaluation of community of inquiry model with its metacognitive presence construct2012Ingår i: The International Journal on Advances in ICT for Emerging Regions, ISSN 1800-4156, Vol. 5, nr 4, s. 1-13Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Among the discussion-content analytical tools in the field of e-learning research, the community of inquiry (CoI) model is extensively applied and continuously improved by its users. This model investigates the types of elements that are manifested through inquiry-based learning processes in online discussions. They are social, cognitive, teaching and metacognitive presences. These elements are essential for meaningful student interactions to take place in online learning environments. In particular, the metacognitive presence construct of the CoI model discovers the students’ ability of self and co-regulation of learning in an online learning environment. However, the metacognitive presence construct of the CoI model has not been evaluated along with the other components of the model. Therefore, in this paper the CoI model was re-evaluated to determine its reliability in analysing discussions in online courses on information technology related subjects. The evaluation is conducted with four online courses designed and developed for a distance learning programme in Sri Lanka. The paper discusses the modifications that were needed to make the model more applicable for conducting discussion-content analysis in similar types of online learning environments, and reports on the results of the final evaluation. Furthermore, the findings of the study imply that the theoretical framework of the CoI model needs to be improved to properly enclose the metacognitive presence component. In spite of this, the study adds points to the CoI model supporting for its well applicability and reliability in analysing online discussion content in information technology related courses.

  • 46404.
    Weerasinghe, Thushani A.
    et al.
    University of Colombo, Sri Lanka.
    Nishakumari, Kariyawasam M. G. B.
    University of Colombo, Sri Lanka.
    Hewagamage, Kamalanath P.
    University of Colombo, Sri Lanka.
    Gap between theory and practice: Human factors in designing and developing effective e-learning materials for a structured syllabus2007Ingår i: The International Journal of the Computer, the Internet and Management, ISSN 0858-7027, Vol. 15, nr SP3, s. 19.1-19.6Artikel i tidskrift (Refereegranskat)
  • 46405.
    Weerasinghe, Thushani A.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Colombo, Sri Lanka.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath P.
    University of Colombo, Sri Lanka.
    An Empirical Study: A success story of effectiveness of an OLE2008Ingår i: Proceedings of International Conference on Computer Aided Learning (ICL) 2008 / [ed] Michael E. Auer, 2008, s. 1(10)-10(10)Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents the results of an empirical study conducted with students following a distance education program. In the study questions posed were whether students could perform well in examinations using only the Learning Management System (LMS), whether they could use it in an efficient way and whether there was a relationship between students’ learning styles, number of LMS hits and learning achievements. Students were given access to a specially designed course section. The students’ learning achievements were evaluated in two tests at different intervals. The study data were gathered using questionnaires and LMS statistics. We found that once the students got acquainted with the environment they could use the LMS more efficiently and managed to get high scores by only using the LMS. Results associated with the learning style preferences imply that we have designed the learning content and the environment to support learners with different learning style preferences.

  • 46406.
    Weerasinghe, Thushani A.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath P.
    University of Colombo School of Computing, Sri Lanka.
    Designing Online Learning Environments for Distance Learning2009Ingår i: International Journal of Instructional Technology and Distance Learning, ISSN 1550-6908, Vol. 6, nr 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The design of an Online Learning Environment (OLE) and presentation of content in a distance educational programme is a major factor in success or failure of the learning programme. The role of instructional designers who design online learning environments for distance learning programmes has become demanding. In order to support instructional designers to do their work effectively, they are provided with instructional design guidelines. However, most of these guidelines are not specific nor easily applicable. Therefore, we were motivated to create sets of easy applicable instructional design guidelines. We selected an OLE which was already reported as successful in achieving learning effectiveness and student satisfaction. We gathered students’ experiences on using the OLE for their studies and analysed the data to find what design components of the OLE has led to the learner satisfaction, what design strategies used to design the learning content and design features of it led to the learning effectiveness and whether there was a relationship between students’ learning style preferences and students’ learning design preferences. The findings of the data analysis were presented as guidelines for instructional designers of online learning materials for novice online learners in distance learning programmes. on computer applications and information technology.

  • 46407.
    Weerasinghe, Thushani A.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Colombo, Sri Lanka.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath P.
    University of Colombo, Sri Lanka.
    Student led inquiry-based learning2014Ingår i: International journal of education and information technologies, ISSN 2074-1316, Vol. 8, s. 265-275Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Inquiry-based learning and peer-teaching are two teaching and learning approaches best applicable in higher educational contexts. Considering benefits of each approach in learning, a study was conducted to determine how to design peer-teaching activities to promote inquiry-based learning. Data were collected from a group of instructional designers, a sample group of students in an online learning environment prepared for a distance learning programme and from the learning management system of the online learning environment. The findings of the study were used to improve sets of design principles that were followed to design the peer-teaching activity. In addition, sets of design guidelines were also prepared for easy application of the design principles.

  • 46408.
    Weerasinghe, Thushani Alwis
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, K. P.,
    Learners' Satisfaction, Learning Style Preferences and Effectiveness of an OLE2008Ingår i: International Journal on Emerging Technologies in Learning (iJET), Vol. 3Artikel i tidskrift (Refereegranskat)
  • 46409.
    Weerasinghe, Thushani Alwis
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Colombo, Sri Lanka.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath Priyantha
    University of Colombo, Sri Lanka.
    Inquiry-Based Learning With or Without Facilitator Interactions2012Ingår i: Journal of Distance Education, ISSN 0830-0445, Vol. 26, nr 2Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper discusses findings of a study investigating how students, on four online courses, engaged in inquiry-based learning with and without support from a facilitator. The investigation was conducted by analysing discussions of the online courses using the community of inquiry model. The results of the study imply that students in online discussions can engage in deep and meaningful learning, even when there is no facilitator interaction. Further the findings of the analysis suggest that successful inquiries are possible without teacher or facilitator interactions, if learning environments are designed to support students to be interactive and the students have motivation, regulatory skills and a willingness to collaborate with peers.

  • 46410.
    Weerasinghe, Thushani Alwis
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Colombo, Sri Lanka.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath Priyantha
    University of Colombo, Sri Lanka.
    Learners' satisfaction, learning style preferences and effective use of an OLE2008Ingår i: International Journal of Emerging Technologies in Learning, ISSN 1863-0383, Vol. 3, s. 77-85Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents the results of an empirical study conducted with a set of students using an online learning environment (OLE) to follow a distance education program. The aim of the study was to find whether students could perform well in examinations using only the Learning Management System (LMS), whether they could use it in an efficient way and whether there was a relationship between students? learning styles, number of LMS hits and learning achievements. The students were given access to a specially designed course section. The students? learning achievements were evaluated in two tests at different intervals. The study data were gathered using questionnaires and LMS statistics. We found that once the students got acquainted with the environment they could use the LMS more efficiently and managed to get high scores by only using the LMS. Results associated with the learning style preferences imply that we have designed the learning content and the environment to satisfy and support the learners with different learning style preferences.

  • 46411.
    Weerasinghe, Thushani
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hewagamage, Kamalanath
    Designing a peer-teaching activity to promote inquiry-based learning2013Ingår i: Mathematics and Computers in Contemporary Science: Proceedings / [ed] Reinhard Neck, WSEAS Press , 2013, s. 34-43Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper discusses findings of a study conducted to determine how to design peerteaching activities to promote inquiry based learning in a virtual learning environment (VLE) designed for a distance learning programme where teacher support is kept at a minimum level. A previous study conducted in the same environment, revealed that the students could engage in peer-teaching. Considering this ability and the instructional designers’ requirement to know how forum based activities should be designed, a peer-teaching activity was designed with necessary instructions to promote inquiry-based learning in the VLE. The activity was designed based on sets of collaborative and inquiry-based learning design principles. The findings of the study were used to improve the sets of design principles. In addition, sets of design guidelines were also prepared for easy application of the design principles.

  • 46412. Wegmann, A.
    et al.
    Kotsalainen, Anders
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Matthey, L.
    Regev, G.
    Giannattasio, A.
    Augmenting the Zachman enterprise architecture Framework with a systemic conceptualization2008Ingår i: Proc. - IEEE Int. Enterp. Distrib. Object Comput. Conf., EDOC, 2008, s. 3-13Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Zachman Framework offers a classification of the models created in an enterprise architecture project. These models form a holistic representation of the organization. Despite the prominent position of the Framework, there is little information publicly available to help designers create exact models that fit each other. In this paper, we propose a conceptualization based on General Systems Thinking. Our conceptualization provides concrete guidelines for creating the models required by the Framework. The proposed conceptualization establishes a better understanding of the models and of their relationships. This facilitates the creation and interpretation of the models. It also improves the traceability between them. We illustrate our approach with the results of a case study.

  • 46413.
    Weherage, Pradeep Peiris
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    BigDataCube: Distributed Multidimensional Data Cube Over Apache Spark: An OLAP framework that brings Multidimensional Data Analysis to modern Distributed Storage Systems2017Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Multidimensional Data Analysis är en viktig del av Data Analytic paradigm. Data Cube tillhandahåller den grundläggade abstraktionen för Multidimensional Data Analysis och hjälper till att hitta användningsbara observationer av ett dataset. OnLine Analytical Processing (OLAP) lyfter det till nästa nivå och stödjer resultat från analytiska frågor i realtid med en underliggande teknik som materliserar Data Cubes. Data Cube Materialization är signifikant för OLAP, men är en kostsam uppgift vad gäller processa och lagra datat.De flesta av tidiga beslutssystem uppfyller Multidimensional Data Analysis med en standarddataarkitektur som extraherar, transformerar och läser data från flera datakällor in I en central databas, s.k. Data Warehouse, som exekveras av OLAP och tillhandahåller en Data Cube-abstraktion. Men denna arkitektur och tradionella OLAP-motorer klarar inte att hantera moderna högbelastade datasets. Idag har vi system med distribuerad datalagring, som har data på ett kluster av datornoder, med distribuerade dataprocesser, så som MapReduce, Spark, Storm etc. Dessa tillåter en mer ad-hoc dataanalysfunktionalitet. Än så länge så finns det ingen korrekt angreppsätt tillgänlig för Multidimensional Data Analysis eller någon distribuerad OLAP-motor som följer Distributed Data Cube Materialization.Det är viktigt att ha en korrekt Distributed Data Cube Materializationmekanism för att stödja Multidimensional Data Analysis för dagens distribuerade lagringssystem. Det finns många forskningarar idag som tittar på MapReduce för Data Cube Materialization. Nyligen har även Apache Spark tillgänglitgjort CUBE-operationer som en del av deras DataFrame API. Detta examensarbete tar upp frågeställningen, vilket som är det bästa angrepssättet för distribuerade system för Data Cube Materialization, MapReduce eller Spark. Arbetet bidrar dessutom med experiment som jämför de två distribuerade systemen i materialiserande datakubar över antalet poster, dimensioner och klusterstorlek. Examensarbetet bidrar även med ett mindre ramverk BigDataCube, som använder Spark DataFramesi bakgrunden för Data Cube Materialization och uppfyller behovet av Multidimensional Data Analysis av distribuerade lagringssystem.

  • 46414.
    Wehrmann, Felix
    Uppsala universitet, Fakultetsövergripande enheter, Centrum för bildanalys.
    On Modelling Nonlinear Variation in Discrete Appearances of Objects2004Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Mathematical models of classes of objects can significantly contribute to the analysis of digital images. A major problem in modelling is to establish suitable descriptions that cover not only a single object but also the variation that is usually present within a class of objects.

    The objective of this thesis is to develop more general modelling strategies than commonly used today. In particular, the impact of the human factor in the model creation process should be minimised. It is presumed that the human ability of abstraction imposes undesired constraints on the description. In comparison, common approaches are discussed from the viewpoint of generality.

    The technique considered introduces appearance space as a common framework to represent both shapes and images. In appearance space, an object is represented by a single point in a high-dimensional vector space. Accordingly, objects subject to variation appear as nonlinear manifolds in appearance space. These manifolds are often characterised by only a few intrinsic dimensions. A model of a class of objects is therefore considered equal to the mathematical description of this manifold.

    The presence of nonlinearity motivates the use of artificial auto-associative neural networks in the modelling process. The network extracts nonlinear modes of variation from a number of training examples. The procedure is evaluated on both synthetic and natural data of shapes and images and shows promising results as a general approach to object modelling.

  • 46415.
    Wehrmann, Felix
    et al.
    Uppsala universitet, Fakultetsövergripande enheter, Centrum för bildanalys. Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
    Bengtsson, Ewert
    Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
    Modelling non-linearities in images using an auto-associativeneural network2003Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, we address non-linearities in images to approach

  • 46416.
    Wehrmann, Felix
    et al.
    Uppsala universitet, Fakultetsövergripande enheter, Centrum för bildanalys. Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
    Bengtsson, Ewert
    Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datoriserad bildanalys.
    Modelling of shapes without landmarks2003Konferensbidrag (Refereegranskat)
    Abstract [en]

    The complexity in variation that objects are provided with motivates to consider learning strategies when modeling their shape. This paper evaluates auto-associative neural networks and their application to shape analysis. Previously, such networks have b

  • 46417.
    Wehrmeister, Marco A.
    et al.
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    Pignaton de Freitas, Edison
    Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).
    Pereira, Carlos E.
    Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
    An Infrastructure for UML-Based Code Generation Tools2009Ingår i: Analysis, architectures and modelling of embedded systems: Third IFIP TC 10 International Embedded Systems Symposium, IESS 2009, Langenargen, Germany, September 14-16, 2009, proceedings / [ed] Rettberg, A Zanella, MC Rammig, FJ, New York: Springer-Verlag New York, 2009, s. 32-43Konferensbidrag (Refereegranskat)
    Abstract [en]

    The use of Model-Driven Engineering (MDE) techniques in the domain of distributed embedded real-time systems are gain importance in order to cope with the increasing design complexity of such systems. This paper discusses an infrastructure created to build GenERTiCA, a flexible tool that supports a MDE approach, which uses aspect-oriented concepts to handle nonfunctional requirements from embedded and real-time systems domain. GenERTiCA generates source code from UML models, and also performs weaving of aspects, which have been specified within the UML model. Additionally, this paper discusses the Distributed Embedded Real-Time Compact Specification (DERCS), a PIM created to support UML-based code generation tools. Some heuristics to transform UML models into DERCS, which have been implemented in GenERTiCA, are also discussed.

  • 46418. Wei, A.
    et al.
    Hu, Xiaoming
    KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Optimeringslära och systemteori.
    Wang, Y.
    Tracking control of leader-follower multi-agent systems subject to actuator saturation2014Ingår i: IEEE/CAA Journal of Automatica Sinica, ISSN 2329-9266, Vol. 1, nr 1, s. 84-91Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper addresses the tracking problem of leader-follower multi-agent systems subject to actuator saturation. A leader node or command generator is considered, which generates the desired tracking trajectory. To track such a leader, a new family of scheduled low-and-high-gain feedback controllers is designed for each follower, provided that the linear dynamic mode is asymptotically null controllable with bounded controls, and such control laws rely on the asymptotic property of a class of parametric algebraic Ricatti equations. We show that if the associated undirected graph of the system is connected, with the proposed control law, all the followers can track the leader eventually. A simulation example is finally given to illustrate the performance of the proposed control scheme.

  • 46419. Wei, Bo
    et al.
    Varshney, Ambuj
    Petwari, Neal
    Hu, Wen
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    dRTI: Directional Radio Tomographic Imaging2015Konferensbidrag (Refereegranskat)
  • 46420.
    Wei, Da
    et al.
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad.
    Ding, Yijie
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad.
    Selecting Housing Development Sites using Multi-Criteria Decision Analysis (MCDA): A Case Study of Guangzhou, China2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Planning is of vital importance for the development urban areas to facilitate sustainable economic growth and social functions. The traditional, manual ways of planning that depend on biophysical data and use a hierarchical approach are no longer appropriate for site choice since information is rapidly updated today. Multi-criteria analysis (MCA) has been used for about two decades with geographic information systems (GIS) to analyze spatial problems. GIS-based Multi-Criteria Decision Analysis (MCDA) provides tools for assessing the inherent tradeoffs and mechanisms for incorporating and documenting the value judgments of interest groups and decision makers and is thus a more reasonable and scientific way for site selection to development. Guangzhou, the study area of this paper, is one of the fastest developing and largest cities located in Southern China. This research used the GIS-based MCDA approaches to find the appropriate sites for residential areas in Guangzhou. Satellite images, DEM and several thematic maps of Guangzhou were used in this research. Using different methods and technologies, the data were used to create constraint and factor maps for multi-criteria analysis. After building the MCA model, the weights for multi-criteria analysis were obtained through an analytic hierarchy process (AHP) by comparing the importance of every two factors. Finally, a suitability map for housing development was generated. The result indicates that with the help of GIS and remote sensing technologies, the process of site selection and urban planning can be done in a more effective and scientific way. The limitation and future perspective of GIS based MCDA methods are discussed.

  • 46421.
    Wei, Li
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Kilander, Fredrik
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Jansson, Carl-Gustaf
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Extending instant messaging to provide pervasive personal communication2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper proposes a personal software architecture to provide a user with a pervasive communication capability. The core of this architecture is a Personal Communication Server (PCS) which bridges between different Instant Messaging networks and extends them with a unified access to the user. A SIP-based implementation of such a communication server is presented, which solves various interoperability problems, and also provides many value-added features, e.g., extended user presence with location information, adaptive communication, better privacy protection, etc. This implementation enables various existing SIP-compatible resources to be re-used and thus simplifies the construction of the proposed software architecture.

  • 46422.
    Wei, Malanxin
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    User acceptance of E-Payment Systems in the Context of Cultural Influence: A case study of PayEx in Linnaeus University2016Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    With the technological development of e-commerce and the increasing necessity to use online transactions, more and more online electronic payments systems have appeared to meet global demand. Furthermore, user acceptance of these kinds of systems is different for individuals in different cultures, and culture could be a factor that has great potential impact on predictions of user acceptance. The world has evolved to a degree where transactions occur between different cultural environments. This study aims to provide an understanding of how culture affects users’ intentions of electronic payment systems. Based on the purpose of this study, a questionnaire has been conducted in the interest of collecting data for statistical purposes. To make more sense about the results, a case study on PayEx (an electronic payment system) in Linnaeus University has been conducted through analysing twenty users’ interview records. Finally, this study expands on user acceptance research through looking at the role of culture and social influence. In practice, the results of this study give the thought for accurate forecasting of user acceptance towards electronic payment systems with considering cultural influence.

  • 46423.
    Wei, Wei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    King, Irwin
    Lee, Jimmy Ho-Man
    Bibliographic attributes extraction with layer-upon-layer tagging2007Ingår i: ICDAR 2007: Ninth International Conference On Document Analysis And Recognition, Vols I And II, Proceedings / [ed] Werner, B, 2007, s. 804-808Konferensbidrag (Refereegranskat)
    Abstract [en]

    Bibliographic attributes extraction is an important research topic for digital libraries. In this paper we propose a rule-based method for bibliographic attributes extraction with Layer-upon-Layer Tagging (LLT). The method analyzes bibliographic attributes' appearances and punctuations to perform format and semantic taggings on two defined parsing layers. The method also resolves to specifically constructed lexicons to achieve high accuracy of semantic tagging. In the experimental evaluation on 1,000 reference strings, the accuracy of author tagging reaches to 96.8% and the accuracy Of whole reference tagging is 82.9%. The experimental results demonstrate that the proposed LLT method can tag bibliographic attributes in reference strings with high degree of accuracy.

  • 46424.
    Wei, Wei
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Lee, J.
    King, I.
    Measuring credibility of users in an e-learning environment2007Ingår i: 16th International World Wide Web Conference, WWW2007, 2007, s. 1279-1280Konferensbidrag (Refereegranskat)
    Abstract [en]

    Learning Villages (LV) is an E-learning platform for people's online discussions and frequently citing postings of one another. In this paper, we propose a novel method to rank credit authors in the LV system. We first propose a k-EACM graph to describe the article citation structure in the LV system. And then we build a weighted graph model k-UCM graph to reveal the implicit relationship between authors hidden behind the citations among their articles. Furthermore, we design a graph-based ranking algorithm, the Credit Author Ranking (CAR) algorithm, which can be applied to rank nodes in a graph with negative edges. Finally, we perform experimental evaluations by simulations. The results of evaluations illustrate that the proposed method works pretty well on ranking the credibility of users in the LV system.

  • 46425.
    Wei, Wei
    et al.
    School of Computer Science and Engineering, Xi’an University of Technology.
    Song, Houbing
    Department of Electrical and Computer Engineering, West Virginia University, Montgomery, WV .
    Li, Wei
    Centre for Distributed and High Performance Computing, School of Information Technologies, The University of Sydney.
    Shen, Peiyi
    National school of Software, Xidian University.
    Vasilakos, Athanasios
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Gradient-driven parking navigation using a continuous information potential field based on wireless sensor network2017Ingår i: Information Sciences, ISSN 0020-0255, E-ISSN 1872-6291, Vol. 408, s. 100-114Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wireless sensor networks can support building and transportation system automation in numerous ways. An emerging application is to guide drivers to promptly locate vacant parking spaces in large parking structures during peak hours. This paper proposes efficient parking navigation via a continuous information potential field and gradient ascent method. Our theoretical analysis proves the convergence of a proposed algorithm and efficient convergence during the first and second steps of the algorithm to effectively prevent parking navigation from a gridlock situation. The empirical study demonstrates that the proposed algorithm performs more efficiently than existing algorithms.

  • 46426.
    Wei, Wenyang
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för programvaruteknik.
    Private User’s Trust on Data sharing in e- health Applications2017Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Context. One of the challenges in requirement engineering is the ability using survey as a requirement-engineering tool towards the software to refine user’s requirements. For instance, with the development of the way of healthcare, many advances in technology transformed the way of healthcare. E-health application is one of the technologies. As more and more health information that is stored electronically, e- health applications have given rise to trust issue in the area of data sharing. Identified the relationship between trust and data sharing based on the survey method is a valid approach, but the current studies still do not give a definite guideline about how requirement engineering should use a survey method step-by-step to refine the needs of users’ trust into software attributes. Based on the mentioned situation in e-health, defining a method to design survey to elicit requirements is needed.

    Objective. In this paper, the aim of the study is to design a survey method for refining user’s requirements of trust in requirement engineering based on the current state-of-art. The paper present the research on data sharing in e-health application. Methods. This study presented an action research, which identified the way about how to refine user’s requirement of trust. Survey was the main approach to do investigation among the e-health applications. Three cycles of AR were conducted in this paper, and three versions of questionnaires were designed in the research process in order to identify the factors that affected user’s trust in data sharing in e-health applications.

    Results. Through the action research, I found out three factors that affected user’s trust in data sharing, then the factors were identified, analysis and summarized, and the relationship between trusts and the factors is describe based on analysis results of the collected data, which obtain from the improved questionnaires. To find out the relationship between trust and the factors help present the process that how to design an accurate survey to refine user’s requirements.

    Based on the process and results of the action research, the survey guideline to refine user’s requirements of trust is designed and described. Conclusions. Based on the results that obtained in this study, I designed a preliminary survey guideline for refining user’s requirements of trust. This study will help requirement engineering to elicit requirement of trust in e-health based on a new and specific survey method. 

  • 46427.
    Wei, Xin
    Linköpings universitet, Institutionen för systemteknik.
    Analysis of Quality of Service of Wireless LAN for IEEE 802.11e2004Självständigt arbete på grundnivå (yrkesexamen)Studentuppsats
    Abstract [en]

    Nowadays Wireless LAN is playing a more and more important role in network systems. After 1999, in which the IEEE organization published its Wireless Local Network standard 802.11[1], many people saw the advantages of the standard but also the lack of support for multimedia streaming. A lot of research work has been done on the proposed IEEE 802.11e standard draft during the past 4 years. It is supposed to be able to fully support Quality of Service. The final version will be published early in 2004. In my thesis, I propose two possible methods to improve the performance of service differentiation in the MAC layer. The first one is calledPCWA (Practical Contention Window Adjustment). It is a method with which the station finds a best size of its contention window when running the EDCF (Enhanced Distributed Coordination Function) access method. It helps to improve the total system throughput, the jitter and the delay of traffics with different priorities. The second method is called AIPM (Adaptive Initiative Polling Machine). It uses the polling mechanism for differential service, intelligently arranging the polling time to reduce the delay as much as possible, achieving large improvement in performance. This method significantly increases the total system throughput, while the delay and jitter of the traffics are very much small in comparison to EDCF.

  • 46428. Wei, Xinzhu
    et al.
    Zhao, Lei
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Waxman, David
    Population structure and the rate of evolution2015Ingår i: Journal of Theoretical Biology, ISSN 0022-5193, E-ISSN 1095-8541, Vol. 365, s. 486-495Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The way population size, population structure (with migration), and spatially dependent selection (where there is no globally optimal allele), combine to affect the substitution rate is poorly understood. Here, we consider a two patch model where mutant alleles are beneficial in one patch and deleterious in the other patch. We assume that the spatial average of selection on mutant alleles is zero. We take each patch to maintain a finite number of N adults each generation, hence random genetic drift can independently occur in each patch. We show that the principal way the population size, N, when large, affects the substitution rate, R-infinity, is through its dependence on two composite parameters. These are the scaled migration rate M (proportional to population size x migration rate), and the scaled selection intensity S (proportional to population size x beneficial effect of a mutant). Any relation between S and M that arises for ecological/evolutionary reasons can strongly influence the way the substitution rate, R-infinity, depends on the population size, N. In the simplest situation, both M and S are proportional to N, and this is shown to lead to R-infinity increasing with N when S is not large. The behaviour, that R-infinity increases with N, is not inevitable; a more complex relation between S and M can lead to the opposite or other behaviours. In particular, let us assume that dM/dN is positive, as would occur if the migration rate were constant, S is not large, and S depends on M (i.e., S=S(M)). We then find that if S(M) satisfies S(M) > ((1+M)/ root 1+2M)S(0) then the substitution rate, R-infinity, increases with N, but if S(M) < ((1+M)/root 1+2M)S(0) then R-infinity decreases with N. (C) 2014 Elsevier Ltd. All rights reserved.

  • 46429. Wei, Yangjie
    et al.
    Wu, Chengdong
    Yi, Wang
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik.
    Dong, Zaili
    Efficient shape reconstruction of microlens using optical microscopy2015Ingår i: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, nr 12, s. 7655-7664Artikel i tidskrift (Refereegranskat)
  • 46430. Wei, Yangjie
    et al.
    Wu, Chengdong
    Yi, Wang
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik.
    Wang, Wenxue
    Diffusion-based three-dimensional reconstruction of complex surface using monocular vision2015Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, nr 23, s. 30364-30378Artikel i tidskrift (Refereegranskat)
  • 46431. Wei, Yangjie
    et al.
    Yi, Wang
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Datorteknik.
    Dynamic blind source separation based on source-direction prediction2016Ingår i: Neurocomputing, ISSN 0925-2312, E-ISSN 1872-8286, Vol. 185, s. 73-81Artikel i tidskrift (Refereegranskat)
  • 46432. Wei, Yaya
    et al.
    Li, Chuang
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Ren, Fengyuan
    Fuzzy control for guaranteeing absolute delays in web servers2006Ingår i: International Journal of High Performance Computing and Networking, ISSN 1740-0562, E-ISSN 1740-0570, Vol. 4, nr 5Artikel i tidskrift (Refereegranskat)
  • 46433. Wei, Yaya
    et al.
    Lin, Chuang
    Fengyuan, Ren
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Fuzzy Control for Guaranteeing Absolute Delays in Web Servers2005Ingår i: The Second International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QShine), 2005, 1Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents a fuzzy control approach that guarantees absolute delays in web servers. Previous work has proposed the use of classical PI controllers for delay guarantees. However, a disadvantage of the classical PI controller is that the system model, which is obtained by system identification, mismatches the real system and inevitably degrades the performance of the web system. In contrast with classical PI controllers, fuzzy controllers are nonlinear and therefore independent of the accurate model of the plant, i.e. the controlled system. Hence, fuzzy controllers seem to be very suitable for web servers. Our experiments show that fuzzy controllers indeed perform better than PI controllers presented in earlier papers.

  • 46434.
    Wei, Zhengzhe
    Linköpings universitet, Institutionen för systemteknik, Datorteknik.
    H.264 Baseline Real-time High Definition Encoder on CELL2010Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    In this thesis a H.264 baseline high definition encoder is implemented on CELL processor. The target video sequence is YUV420 1080p at 30 frames per second in our encoder. To meet real-time requirements, a system architecture which reduces DMA requests is designed for large memory accessing. Several key computing kernels: Intra frame encoding, motion estimation searching and entropy coding are designed and ported to CELL processor units. A main challenge is to find a good tradeoff between DMA latency and processing time. The limited 256K bytes on-chip memory of SPE has to be organized efficiently in SIMD way. CAVLC is performed in non-real-time on the PPE.

     

    The experimental results show that our encoder is able to encode I frame in high quality and encode common 1080p video sequences in real-time. With the using of five SPEs and 63KB executable code size, 20.72M cycles are needed to encode one P frame partitions for one SPE. The average PSNR of P frames increases a maximum of 1.52%. In the case of fast speed video sequence, 64x64 search range gets better frame qualities than 16x16 search range and increases only less than two times computing cycles of 16x16. Our results also demonstrate that more potential power of the CELL processor can be utilized in multimedia computing.

     

    The H.264 main profile will be implemented in future phases of this encoder project. Since the platform we use is IBM Full-System Simulator, DMA performance in a real CELL processor is an interesting issue. Real-time entropy coding is another challenge to CELL.

  • 46435. Weidel, Philipp
    et al.
    Djurfeldt, Mikael
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Parallelldatorcentrum, PDC.
    Duarte, Renato C.
    Morrison, Abigail
    Closed Loop Interactions between Spiking Neural Network and Robotic Simulators Based on MUSIC and ROS2016Ingår i: Frontiers in Neuroinformatics, ISSN 1662-5196, E-ISSN 1662-5196, Vol. 10, artikel-id 31Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to properly assess the function and computational properties of simulated neural systems, it is necessary to account for the nature of the stimuli that drive the system. However, providing stimuli that are rich and yet both reproducible and amenable to experimental manipulations is technically challenging, and even more so if a closed-loop scenario is required. In this work, we present a novel approach to solve this problem, connecting robotics and neural network simulators. We implement a middleware solution that bridges the Robotic Operating System (ROS) to the Multi-Simulator Coordinator (MUSIC). This enables any robotic and neural simulators that implement the corresponding interfaces to be efficiently coupled, allowing real-time performance for a wide range of configurations. This work extends the toolset available for researchers in both neurorobotics and computational neuroscience, and creates the opportunity to perform closed-loop experiments of arbitrary complexity to address questions in multiple areas, including embodiment, agency, and reinforcement learning.

  • 46436. Weideman, Nicolaas
    et al.
    van der Merwe, Brink
    Berglund, Martin
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
    Watson, Bruce
    Analyzing Matching Time Behavior of Backtracking Regular Expression Matchers by Using Ambiguity of NFA2016Ingår i: Implementation and Application of Automata, Springer, 2016, s. 322-334Konferensbidrag (Refereegranskat)
    Abstract [en]

    We apply results from ambiguity of non-deterministic finite automata to the problem of determining the asymptotic worst-case matching time, as a function of the length of the input strings, when attempting to match input strings with a given regular expression, where the matcher being used is a backtracking regular expression matcher.

  • 46437.
    Weidensten, Anna
    Högskolan i Skövde, Institutionen för datavetenskap.
    Människors förväntningar på arbetsbelysningen i hemmiljö: En studie för IKEA of Sweden2004Självständigt arbete på grundnivå (kandidatexamen)Studentuppsats
    Abstract [sv]

    Det artificiella ljuset är något som idag ses som en självklarhet. Det är först när ett strömavbrott uppstår som betydelsen av ljuset blir riktigt påtaglig och visar hur hjälplösa människor blir utan det. En bra belysningsanordning, på exempelvis arbetsplatsen, är en förutsättning för att korrekt information från kontexten återges. Det här examensarbetet har undersökt vilka förväntningar och krav människor har på sin arbetsbelysning i hemmet. I samband med examensarbetet utfördes intervjuer för att få en bättre förståelse för hur individer tänker kring arbetsbelysning i hemmiljö.

    Det erhållna resultatet värderades sedan i relation till en konceptuell modell över hur ljuset kan påverka arbetsprestationen. Studien förväntades besvara vilken betydelse och funktion komponenterna förväntningar, kontext och humör har för arbetsbelysning i hemmiljösammanhang. Utifrån resultatet kan en slutsats dras om att Boyces arbetsprestationsmodell (2003) kan vara lämplig för att beskriva arbetsbelysningskontexten men att vissa modifieringar i modellen bör göras. Människor har olika förväntningar på arbetsbelysningen och det gäller främst designen, ljusstyrkan och ljusspridningen.

  • 46438. Weidner, M
    et al.
    Trapaidze, L
      Pensl, G
    Reshanov,  SA
      Schöner, A
    RISE., Swedish ICT, Acreo.
    Itoh,  H
    Ohshima, T
     Kimoto, T
    Deep defects in 3C-SiC generated by H+- He+-implantation or by irradiation with high-energy electrons2010Ingår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 645-648, s. 439-442Artikel i tidskrift (Refereegranskat)
  • 46439. Weigand, Hans
    et al.
    Andersson, Birger
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jayasinghe Arachchig, Jeewanie
    Bergholtz, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Closing the User-Centric Service Coordination Cycle by Means of Coordination Services2011Konferensbidrag (Övrigt vetenskapligt)
  • 46440. Weigand, Hans
    et al.
    Andersson, Birger
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bergholtz, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jayasinghe Arachchig, Jeewanie
    Closing the User-Centric Service Coordination Cycle2010Ingår i: Proc. of the 22nd International Conference on Advanced Information Systems Engineering (CAiSE'10) Forum, Springer Verlag , 2010Konferensbidrag (Övrigt vetenskapligt)
  • 46441. Weigand, Hans
    et al.
    Andersson, Birger
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bergholtz, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jayasinghe Arachchig, Jeewanie
    Describing Coordination Services with REA2010Ingår i: Proc. of the 5th International Workshop on Business/IT Alignment and Interoperability (BUSITAL'10), CEUR , 2010Konferensbidrag (Övrigt vetenskapligt)
  • 46442. Weigand, H.
    et al.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Arachchige, J. J.
    Describing coordination services with REA2010Ingår i: CAiSE 2010 Workshop BUSITAL’10, 2010, s. 120-134Konferensbidrag (Refereegranskat)
    Abstract [en]

    Coordination services are services, possibly implemented as web services, that support the coordination of (real-world) services that a consumer would like to take. To support users of a future Internet of Services, the effect of the coordination services must be described in such a way that users are not only able to discover services but also to detect and prevent possible conflicts in their composition. In this paper, REA is applied as a solution approach to this requirement. The REA business ontology has proven to be a good foundation for the description of services, but we argue that its conceptualization of commitments can be improved.

  • 46443. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Value-based service modeling and design: Toward a unified view of services2009Ingår i: Advanced Information Systems Engineering, Proceedings, Springer, 2009, s. 410-424Konferensbidrag (Refereegranskat)
    Abstract [en]

    Service-oriented architectures are the upcoming business standard for realizing enterprise information systems, thus creating a need for analysis and design methods that are truly service-oriented. Most research on this topic so far takes a software engineering perspective. For a proper alignment between business and IT, a service perspective at the business level is needed as well. In this paper, a unified view of services is introduced by means of a service ontology, service classification and service layer architecture. On the basis of these service models, a service design method is proposed and applied to a case from the literature. The design method capitalizes on existing value modeling approaches.

  • 46444. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Arachchige, J. J.
    Closing the user-centric service coordination cycle2010Ingår i: CAiSE Forum'10, 2010, s. 1-8Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the future vision of an Internet of Services, users take an active role in service selection and composition. In this context, web services are mostly interfaces to real services and can be classified as coordination services with respect to the latter. To enable users to perform service composition, the effect of the coordination services must be described in such a way that users are not only able to discover services but also to detect and prevent possible conflicts in their composition. To meet these requirements, a service description language for coordination services is proposed based on the REA business ontology.

  • 46445. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Arachchige, J. J.
    Closing the user-centric service coordination cycle by means of coordination services2011Ingår i: CAiSE Forum 2010 on Information Systems Evolution, 2011, s. 267-282Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the future vision of an Internet of Services, users take an active role in service selection and composition. In this context, web services are mostly interfaces to real services and can be classified as coordination services with respect to the latter. To enable users to perform service composition, the effect of the coordination services must be described in such a way that users are not only able to discover services but also to detect and prevent possible conflicts in their composition. To meet these requirements, a service description language for coordination services is proposed based on the REA business ontology.

  • 46446. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Edirisuriya, Ananda
    Dayperuma, Tharaka
    Strategic analysis using value modeling - The c3-value approach2007Ingår i: 40th Annual Hawaii International Conference on System Sciences, 2007. HICSS 2007, IEEE Computer Society, 2007, s. 4076731-Konferensbidrag (Refereegranskat)
    Abstract [en]

    E3-value has proven to be a useful modeling technique and method to support the analysis of business models. However, for strategic analysis, the representation of a business model is not sufficient, as it does not include the rationale behind the model. In this paper, yve propose an extension of e3-value to support strategic analysis on three dimensions competition analysis, customer analysis and capability analysis.

  • 46447. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Edirisuriya, Ananda
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Ilayperuma, Tharaka
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    On the notion of value object2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    It is increasingly recognized that business models offer an abstraction that is useful not only in the exploration of new business networks but also for the design and redesign of operational business processes. Among others, they can be used as input for a risk analysis that is crucial in cross-organizational business process design. However, the notion of value object is up till now not clearly defined. In this paper we investigate the notion of value, value objects and the activities involved when transferring value objects between business actors. We illustrate the proposed value object model by applying it on the well-known conference case.

  • 46448. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Edirisuriya, Ananda
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Ilayperuma, Tharaka
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Zdravkovic, Jelena
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Value-based service design based on a general service architecture2008Ingår i: CEUR Workshop Proc., 2008, s. 88-103Konferensbidrag (Refereegranskat)
    Abstract [en]

    Service-oriented architectures are the upcoming business standard for realizing enterprise information systems, thus creating a need for analysis and design methods that are truly service-oriented. Most research on this topic so far takes a software engineering perspective. For a proper alignment between the business and the IT, a service perspective at the business level is needed as well. In this paper, definitions of "service" are analyzed, resulting in a set of models for the service concept. On the basis of this service architecture, a service design method is proposed and applied to a case from the literature. The design method capitalizes on existing value modeling approaches.

  • 46449. Weigand, H.
    et al.
    Johannesson, Paul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Andersson, Birger
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Jayasinghe Arachchige, J.
    Bergholtz, Maria
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Management services - A framework for design2011Ingår i: 23rd International Conference on Advanced Information Systems Engineering, CAiSE 2011, 2011, s. 582-596Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Service-Oriented Architecture has rapidly become the de facto standard for modern information systems. Although recently considerable research attention has been paid to the management of services, several gaps can still be observed. Service management as far as it is automated is either mixed up with the operational service logic itself, or handled in a separate not service-oriented system, such as a BAM platform. In addition, there is a growing business demand for value-driven service management. In this paper, a general framework for management service design is presented that covers both business services and software services and is rooted in the business ontology REA, extended with a REA management ontology. The framework is applied to two different case studies, one in the Italian wine industry and one related to a robot cleaner.

  • 46450. Weigand, Hans
    et al.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Andersson, Birger
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Petri Net Specification of the REA Business Ontology2016Ingår i: Proceedings of the CAiSE'16 Forum at the 28th International Conference on Advanced Information Systems Engineering (CAiSE 2016) / [ed] Sergio España, Mirjana Ivanović, Miloš Savić, 2016, s. 49-56Konferensbidrag (Refereegranskat)
    Abstract [en]

    Current auditing procedures struggle with the incorporation of new data-driven techniques such as Process Mining. Although Process Mining has been applied experimentally on micro-level workflow processes, it is not so easy to apply on the level of the value cycle that is at the core of accounting databases. A more general problem is that the new smart approaches lack a well-developed accounting ontology. The REA business ontology does offer such an ontology but so far, its main focus has been on accounting database design. In this paper, a Petri Net specification of REA is proposed for ontology-based process analysis. This specification makes it possible to express more than the traditional static specification. The paper also describes how REA Petri Nets can be developed using Process Mining and how they can be applied in a Continuous Auditing framework.

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