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  • 2951.
    Zikra, Iyad
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Zdravkovic, Jelena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Analyzing the Integration between Requirements and Models in Model Driven Development2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    In Model Driven Development (MDD), models replace software code as the development artifact. At the same time, requirements represent the information that is elaborated in models. However, despite the tight relationship between models and requirements, only a few MDD approaches provide the necessary methodological guidelines and tool support to explicitly facilitate this relationship. In this paper, we analyze existing approaches for integrating requirements with models within MDD. Based on the analysis, we elicit a set of general properties that need to be fulfilled when considering the integration of requirements and models, and we assess the contribution of the considered approaches accordingly.

  • 2952.
    Zikra, Iyad
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Zdravkovic, Jelena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bringing Enterprise Modeling Closer to Model-Driven Development2011Ingår i: The Practice of Enterprise Modeling, Springer Berlin Heidelberg , 2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    Enterprise Modeling (EM) provides the means for using models to represent organizational knowledge from different perspectives. When information systems (IS) are involved, Model-Driven Development (MDD) is an approach that focuses on the use of models as primary development artifacts. By observing that EM provides the context for high level requirements, which in turn are the input to MDD, we propose a meta-model that integrates enterprise models and requirements with design models in MDD. The meta-model defines six models that cover both organizational and IS development knowledge. Inter-model relationships ensure an integrated view of the enterprise and the supporting IS by allowing model components to be used across different models. The integrated meta-model is demonstrated through an example case study.

  • 2953.
    Zikra, Iyad
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Zdravkovic, Jelena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Identifying Quality Factors of Information Systems Integration Design2017Ingår i: Perspectives in Business Informatics Research: 16th International Conference, BIR 2017, Copenhagen, Denmark, August 28–30, 2017, Proceedings / [ed] Björn Johansson, Charles Møller, Atanu Chaudhuri, Frantisek Sudzina, Springer, 2017, 45-60 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Information Systems (IS) community has long recognized the importance of studying quality at various stages of the IS design process. Many studies target the quality factors at various stages of design and development. However, research about the factors that specifically affect the quality of IS integration remains largely fragmented. Existing quality frameworks fail to cover integration-specific factors. This motivates the need for a holistic model of integration quality. The paper proposes two artefacts to address this need. It explores the literature of related domains, including systems, model, and process quality to elicit the quality factors that are relevant in the context of IS integration. The factors can be used to evaluate the quality of integration solutions during design and development. The paper also proposes a quality model to describe the quality of the design components of integration solutions following the principles of model-driven development. The model enables the quality factors to be associated with other parts of the IS integration design. The proposed factors are evaluated with the help of expert feedback using a questionnaire, and the quality model is demonstrated with an example business case.

  • 2954.
    Ziyarazavi, Merat
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Magnusson, Christer
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    From Theory to Practice - When and How to Implement Service Value Agreement2013Ingår i: Journal of Service Science and Management, ISSN 1940-9893, E-ISSN 1940-9907, Vol. 6, 127-142 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traditionally, a Service Level Agreement (SLA) is used as an appendix in IT Service Management agreements to set expectations and delineate the service delivery description as well as the terms and conditions of delivery. However, SLAs are unable to imply and guarantee the added values expected by the customer. Service Value Agreement (SVA) is a newly developed framework that identifies the deliverable added values along with metrics to measure the quality and quantity of achievements in terms of business added values. The objective of this study is to expand the concept of SVA for Application Management (AM) services and suggest guidelines for its implementation in real business cases. This goal is fulfilled through the case study approach and outsourcing industry contributions. Authors suggest discussing the concept of SVA from early stages of the sales lifecycle and implementing it gradually during the steady state phase. Combination of Service Value Mapping approach and Piloting method is suggested for SVA proposition as an option with successful practical history.

  • 2955. Ziyarazavi, Merat
    et al.
    Magnusson, Christer
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Tergesten, Torbjörn
    Qualifying and Quantifying IT Services Added Values in Outsourcing Assignments—Service Value Agreement2012Ingår i: Journal of Service Science and Management, ISSN 1940-9893, E-ISSN 1940-9907, Vol. 5, nr 4, 318-330 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traditionally, a Service Level Agreement (SLA) including service level metrics is used as an appendix in IT Service Management agreements to define the terms and conditions of delivery and set expectations. However, SLA neither implies nor guarantees the added values that are expected by the customer. Besides, due to the nature of IT services, there always exists uncertainty about the agreed services due to which the perceived risk for both customer and provider is high. Moreover, the quality and quantity of delivered values are mostly hidden by hazy marketing slogans. In order to guarantee the values of an offered service, the deliverable added values should be characterized properly, quantified by means of measurable metrics, and agreed upon between the two parties. Such comprehensive material, including the deliverable added values along with their measurable metrics, is called Service Value Agreement (SVA). This research proposes a platform for IT service offerings based on added values by identifying, as well as quantifying, an organization’s objectives in purchasing Application Management (AM) services from a provider firm.

  • 2956. Zoric, Goranka
    et al.
    Barkhuus, Louise
    Engström, Arvid
    Önnevall, Elin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Panoramic Video: Design Challenges and Implications for Content Interaction2013Ingår i: EuroITV '13: Proceedings of the 11th european conference on Interactive TV and video, New York: Association for Computing Machinery (ACM), 2013, 153-162 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper we explore viewing and interaction in an emerging type of interactive TV, where viewers are presented with panoramic ultrahigh-definition video combined with extensive interactive control over view selection. Instead of delivering only what will be consumed, emerging TV services offer high- resolution panoramic video to the viewers, enabling them to more freely explore the broadcast content by selecting regions of interest and navigating within the larger panoramic image. However, as we open up the television space both in field of view and in terms of the freedom given to viewers, new interactional challenges emerge. We have done user studies on two systems for interacting with panoramic high-resolution video, one based on the tablet interaction and other on the gesture interaction. Our findings revealed a number of design challenges concerning properties specific to panoramic video. Based on findings from the user studies and the identified design challenges, we have compiled a set of the design recommendations on how to support interactive viewing of panoramic content.

  • 2957.
    Zoric, Goranka
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Engström, Arvid
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Barkhuus, Louise
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hidalgo, Javier Ruiz
    Kochale, Axel
    Gesture Interaction with Rich TV Content in the Social Setting2014Ingår i: Proceedings of TVUX-2013: Workshop on Exploring and Enhancing the User Experience for TV at ACM CHI 2013, 27 April 2013, Paris, France, Association for Computing Machinery (ACM), 2014Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The appearance of new immersive TV content has increased the interactive possibilities presented to the viewers. Increased interactivity is seen as a valuable feature in viewing richer television content, but new functionalities are limited by what can be done naturally and intuitively using available devices like remote controls. Therefore, new interaction techniques, such as visual gestures control systems, have appeared aiming to enhance the viewers’ viewing experience. In this work we begin uncovering the potential and challenges of gesture interaction with ultra high definition video for people watching TV together. As a first step we have done a study with a group of people interacting with such content using a gesture-based system in the home environment.

  • 2958.
    Zuccato, Albin
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kögler, Klemens
    Report: Functional Security Testing closing the software -- security testing gap - A case from a Telecom provider2009Ingår i: ESSOS 09, 2009Konferensbidrag (Refereegranskat)
  • 2959.
    Åhlfeldt, Rose-Mharie
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Information Security in Distributed Healthcare: Exploring the Needs for Achieving Patient Safety and Patient Privacy2008Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In healthcare, patient information is a critical factor. The right information at the right time is a necessity in order to provide the best possible care for a patient. Patient information must also be protected from unauthorized access in order to protect patient privacy. It is furthermore common for patients to visit more than one healthcare provider, which implies a need for cross border healthcare and continuity in the patient process.

    This thesis is focused on information security in healthcare when patient information has to be managed and communicated between various healthcare actors and organizations. The work takes a practical approach with a set of investigations from different perspectives and with different professionals involved. Problems and needs have been identified, and a set of guidelines and recommendations has been suggested and developed in order to improve patient safety as well as patient privacy.

    The results show that a comprehensive view of the entire area concerning patient information management between different healthcare actors is missing. Healthcare, as well as patient processes, have to be analyzed in order to gather knowledge needed for secure patient information management.

    Furthermore, the results clearly show that there are deficiencies both at the technical and the administrative level of security in all investigated healthcare organizations.

    The main contribution areas are: an increased understanding of information security by elaborating on the administrative part of information security, the identification of information security problems and needs in cross border healthcare, and a set of guidelines and recommendations in order to advance information security measures in healthcare.

  • 2960.
    Åkerblom, Beatrice
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Wrigstad, Tobias
    Measuring Polymorphism in Python Programs2016Ingår i: SIGPLAN notices, ISSN 0362-1340, E-ISSN 1558-1160, Vol. 51, nr 2, 114-128 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Following the increased popularity of dynamic languages and their increased use in critical software, there have been many proposals to retrofit static type system to these languages to improve possibilities to catch bugs and improve performance. A key question for any type system is whether the types should be structural, for more expressiveness, or nominal, to carry more meaning for the programmer. For retrofitted type systems, it seems the current trend is using structural types. This paper attempts to answer the question to what extent this extra expressiveness is needed, and how the possible polymorphism in dynamic code is used in practise. We study polymorphism in 36 real-world open source Python programs and approximate to what extent nominal and structural types could be used to type these programs. The study is based on collecting traces from multiple runs of the programs and analysing the polymorphic degrees of targets at more than 7 million call-sites. Our results show that while polymorphism is used in all programs, the programs are to a great extent monomorphic. The polymorphism found is evenly distributed across libraries and program-specific code and occur both during program start-up and normal execution. Most programs contain a few megamorphic call-sites where receiver types vary widely. The non-monomorphic parts of the programs can to some extent be typed with nominal or structural types, but none of the approaches can type entire programs.

  • 2961.
    Åkerblom, Beatrice
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Wrigstad, Tobias
    Mattias, Tumlin
    Jonathan, Stendahl
    Tracing dynamic features in python program2014Ingår i: Proceedings of the 11th Working Conference on Mining Software Repositories, New York: ACM Press, 2014, 292-295 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Recent years have seen a number of proposals for adding (retrofitting) static typing to dynamic programming languages, a natural consequence of their growing popularity for non-toy applications across a multitude of domains. These proposals often make assumptions about how programmers write code, and in many cases restrict the way the languages can be used. In the context of Python, this paper describes early results from trace-based collection of run-time data about the use of built-in language features which are inherently hard to type, such as dynamic code generation. The end goal of this work is to facilitate static validation tooling for Python, in particular retrofitting of type systems.

  • 2962.
    Åkerfeldt, Anna
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för pedagogik och didaktik.
    Selander, Staffan
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Exploring educational video game design: meaning potentials and implications for learning2011Ingår i: Handbook of Research on Improving Learning and Motivation through Educational Games: Multidisciplinary Approaches / [ed] Patrick Felicia, 9781609604950: Information Science Reference , 2011, 1004-1018 s.Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The aim of this chapter is to explore two educational video games as a repository for action and meaning-making. Rixdax and El Patron feature two different game genres and designs. Through a comparative analysis, it will be shown how these two games actually address very different learning goals and also seem to miss a crucial aspect of learning: reflective action. This chapter will investigate how the layout on the screen is composed and how knowledge is represented. To do so, six structuring factors introduced by Prensky (2001), some of the organizing principles of learning design developed by Selander (Selander, 2008a-b; 2009, Selander & Åkerfeldt, 2008) and the multimodal framework developed by Kress and van Leeuween (Kress & van Leeuween, 2006; Kress, 2010; van Leeuween, 2005) are used. The chapter analyses the individual elements as semiotic resources in the educational video game and show how these elements are represented, especially from the points of view of information value, salience and framing, but also how the information is sequenced, the tempo of the games and how they accommodate meta-reflection by the users.

  • 2963.
    Åkerlund, Kent
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Wettergren, Gunnar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Student motivation in distance learning environments – what can we do as teachers to support it?2013Ingår i: 25th ICDE World Conference (16-18 September 2013, Tianjin, China): [Proceedings], 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    Much has been said and written about learner satisfaction and how to motivate students in distance learning environments. Sun et al., (2008) proposes the instructor attitude toward e-learning as one significant factor for driving successful e-learning. Gilly Salmon (2003)states that it is of most importance to build communities in the educational platform and to design courses for interaction, participation and feedback. The need for Teacher–student interaction from a pedagogical point of view is undisputed, however focus in this discussion has often been on courses in a context where the three freedoms of distance learning (Freedom of time, place and pace) is some what limited to only include freedom of time and place. Free pace is often limited to fit the teachers and the administration of the course. This paper discusses the consequences of adding the third factor, freedom of pace for the student into the equation and applying it on a large course with 1000+ students. How do we treat the need of teacher – student interaction and the ability to build a community in a course of that size with limited resources available? The conclusions drawn in this paper come from teaching courses in project management both on an undergraduate and graduate level. The courses are given at the Department of Computer and Systems Sciences (DSV), Stockholm University and they are reached through the use of teacher discussions, self-introspective and practical experiences working as a teacher. In a course where students are allowed to study at their own pace (the third variable in the equation) it is almost impossible to create a personal relationship with individual students in the course. This in essence means that we as teachers and course creators must focus our attention on other task such as creating structure for students, making the course clear and easy to use, which is one of the biggest influences on motivation (Wettergren, 2011). The importance of quickness in reacting to student needs and questions is of utmost importance and enough resources should be devoted to this. In giving the courses at DSV we noticed a significant increase in student performance when imposing an 8-hour maximum response time from teachers. Students are studying when it fits their schedules making the timing of help and support when they are stuck even more important. The possibility to ask questions in public forums with quick responses from skilled tutors who facilitate the students to advance in the course created a sense of community. The presence of the teachers affects not only the students who asks the questions, but also the “lurkers” who get the information they need from reading other students questions. The implementation of scaffolding or “fictive” goals is an effective way of improving student motivation, giving them something to strive for (Wettergren, 2011). After implementing grading windows once a month, meaning that teachers only graded assignments and examination once a month we saw an increase in course throughput and student motivation. An added bonus of this implementation was that in doing so we created a more motivating and interesting teacher situation since we could focus on teaching and helping the students more since grading was concentrated to certain parts of the month.

  • 2964. Çelaj, Ilir
    et al.
    Rusu, Lazar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    IT outsourcing relationships in Swedish public organizations2014Ingår i: Perspectives in Business Informatics Research: Proceedings, Springer, 2014, 15-29 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Information technology (IT) is not only beneficial for the private sector but has a lot to offer for the public sector as well. However, most of the studies in IT outsourcing relationships consider only the private sector and do not pay attention to the public sector. In this context, the research has looked to determine the influential factors in IT outsourcing relationships in Swedish public organizations like are Swedish municipalities and classified them according to the importance. The research methodology used has included a survey among IT outsourcing decision makers from Swedish municipalities and a case study in a Swedish municipality. The survey has revealed that trust, cooperation, commitment, communication, and flexibility are the top five most important factors which are influencing the provider-recipient IT outsourcing relationship in Swedish municipalities. While the case study has revealed that all the factors that were identified during the literature review are influencing the provider-recipient IT outsourcing relationship in Swedish municipalities plus the identification of two new factors which are legislation and economy/money.

  • 2965.
    Önnevall, Elin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Television Practices: Ethnography, Television and User Practices2014Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    This thesis explores television practices in a time when new technology has made it possible to interact with and create your own TV content. The work is focused on how user practices need to be understood in a context of chan- ging technology. The practices studied also show the relevance of ethno- graphic methods, and especially the wide spectrum of these different meth- ods within the field of Human-Computer Interaction. We distinguish be- tween sociologically informed ethnography and anthropological ethnogra- phy. Two questions are addressed: how can new forms of television practices be understood by means of different ethnographic methods, and, on a wider level, what method can we use for analysing methods in ethnographic re- search? Because ethnographic methods are qualitative, we have also chosen to use an open and qualitative approach when analysing them. Through comparing our different methods – their data and findings on one specific topic – we have discovered the differences between the methodological ap- proaches.

  • 2966. Östlund, Johan
    et al.
    Wrigstad, Tobias
    Clarke, Dave
    Åkerblom, Beatrice
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ownership, Uniqueness, Immutability2008Ingår i: 46th International Conference on Objects, Models, Components, Patterns (TOOLS-Europe), 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    Programming in an object-oriented language demands a fine balance between flexibility and control. At one level, objects need to interact freely to achieve our implementation goals. At a higher level, architectural constraints that ensure the system can be understood by new developers and can evolve as requirements change must be met. To resolve this tension, researchers have developed type systems expressing ownership and behavioural restrictions such as immutability. This work reports on our consolidation of the resulting discoveries into a single programming language. Our language, Joe_3, imposes little additional syntactic overhead, yet can encode powerful patterns such as fractional permissions and the reference modes of Flexible Alias Protection.

57585960 2951 - 2966 av 2966
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