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  • 451.
    Chemane, Lourino
    et al.
    UTICT, Mozambique.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    e-Government and Architecture Principles Government Portal Case Study2006Ingår i: Exploiting the Knowledge Economy: Issues, Applications, Case Studies / [ed] Paul Cunningham & Miriam Cunningham, Amsterdam: IOS Press , 2006Konferensbidrag (Refereegranskat)
  • 452.
    Chemane, Lourino
    et al.
    UTICT, Mozambique.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Finger, Matthias
    eGovernment and Sociotechnical Feedback Control System2008Ingår i: IST-Africa 2008 Conference Proceedings / [ed] Paul Cunningham & Miriam Cunningham, IIMC International Information Management Corporation , 2008Konferensbidrag (Refereegranskat)
  • 453.
    Chemane, Lourino
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Popov, Oliver
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Carrilho, S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Government Network and Information Security MCDM Framework for the Selection of Security Mechanisms:  2005Ingår i: Proceedings of CNIS 2005 / [ed] M.H. Hamza, Phoenix, USA: Acta Press , 2005Konferensbidrag (Refereegranskat)
    Abstract [en]

    The establishment of Virtual Private Networks (VPNs), Intranets and Internet access channels by Governments raises the need of making sure that only authorized people access the Government VPN resources. The large base of network security mechanisms and VPN implementation alternatives available makes it difficult to select the “optimal” security mechanisms or controls to be used in order to ensure the required or defined level of security for a specific VPN. This paper addresses the security mechanisms selection problem by proposing a MCDM model for structuring the VPN selection decision problem. Data collected from the Government Network Project (GovNet) being implemented in Mozambique was used to support both the development and validation of the Model.

  • 454.
    Chemane, Lourino
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Popov, Oliver
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cossa, T.
    MCDM Model for Selecting Internet Access Technologies: A Case Study in Mozambique2005Ingår i: EUROCON 2005: The International Conference on "Computer as a Tool", Proceedings, volume II, 2005, s. 1738-1741Konferensbidrag (Refereegranskat)
    Abstract [en]

    The development of Internet, networking and access technologies is providing a wide variety of Internet interconnection alternatives. The availability of several options in the Internet interconnection market makes it difficult to select the "optimal" alternative for a specific end-user in a specific context. A MCDM based model for structuring and solving the Internet access technologies selection decision problem is proposed. The applicability and validation of this approach is demonstrated in a case study in Mozambique

  • 455.
    Chemane, Lourino
    et al.
    UTICT, Mozambique.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Popov, Oliver
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Saifodine, Z.
    Government Network and ISP Selection Model - Mozambique Case Study2005Ingår i: Innovation and the Knowledge Economy: Issues, Applications, Case Studies / [ed] Paul Cunningham & Miriam Cunningham, Amsterdam: IOS Press , 2005Konferensbidrag (Refereegranskat)
  • 456.
    Chemane, Lourino
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mapsanganhe, Sergio
    UTICT.
    GovNet e-Mail System Capacity Planning2007Ingår i: IST-Africa 2007 Conference Proceedings / [ed] Paul Cunningham & Miriam Cunningham, 2007Konferensbidrag (Refereegranskat)
    Abstract [en]

    Electronic Government Network (GovNet) e-Mail System, one of the services offered as part of the GovNet Project in Mozambique is expanding. A significant growth in the number of users of the GovNet e-Mail system is expected in the next couple of months due to the addition of 63 new sites /institutions as part of the GovNet-Extension Project. To address the expected demand on the GovNet IT resources there are scientifically proven methods and processes that can aid the planning of the required networking and IT resources. This paper tries to propose an approach to be followed as part of the process of capacity planning for the GovNet e-Mail System storage and bandwidth capacity. All the data in support of the suggested method were collected during the pilot phase of the GovNet through automatic traffic collection application and through interviews of the IT managers of the government institutions benefiting from the GovNet services.

  • 457.
    Chemane, Lourino
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Taula, Rufino
    Tomas, Joaquim
    Centralized e-Mail System: Government Network Case Study2007Ingår i: IST-Africa 2007 Conference Proceedings / [ed] Paul Cunningham 6 Miriam Cunningham, Maputo-Mozambique: IIMC International Information Management Corporation , 2007Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Mozambique eGovernment Strategy has, as one of its objectives, the use of ICTs to improve the effectiveness and efficiency of the public service delivery.  The achievement of this objective depends on the development and deployment of several information systems, such as the implementation of a centralized and government-wide e-mail system, instant messaging and other common communication services. In this paper we analyse the implications resulting from the current approach of using different Internet Service Providers (ISPs) and disaggregated e-mail systems for e-mail communications between public institutions in Mozambique and we propose another approach to the Government of Mozambique for e-mail communication. The information and data used for the analysis were collected through interviews, questionnaires and GovNet statistics and traffic measurements. The main contribution consisted in applying scientific approach for advising the most appropriate alternative of e-mail system for the Government of Mozambique.

  • 458. Chen, Yihsu
    et al.
    Tanaka, Makoto
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, United Kingdom; HEC Montreal, Canada.
    Market Power with Tradable Performance-Based CO2 Emission Standards in the Electricity Sector2018Ingår i: Energy Journal, ISSN 0195-6574, E-ISSN 1944-9089, Vol. 39, nr 6, s. 121-145Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The U.S. Clean Power Plan stipulates a state-specific performance-based CO2 emission standard, delegating states with considerable flexibility for using either a tradable performance-based or a mass-based permit program. This paper analyzes these two standards under imperfect competitive. We limit our attention to (1) short-run analyses and (2) a situation in which all states are subject to the same type of standard. We show that while the cross-subsidy inherent in the performance-based standard might effectively reduce power prices, it could also inflate energy consumption. A dominant firm with a relatively clean endowment under the performance-based standard would be able to manipulate the electricity market as well as to elevate permit prices, which might worsen market outcomes compared to its mass-based counterpart. On the other hand, the "cross-subsidy" could be the dominant force leading to a higher social welfare if the leader has a relatively dirty endowment.

  • 459. Chen, Yihsu
    et al.
    Tanaka, Makoto
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, United Kingdom.
    Tradable Performance-Based CO₂ Emissions Standards: Walking on Thin Ice?2016Ingår i: Energy: Expectations and Uncertainty: 39th International Conference Proceedings of the International Association for Energy Economics, International Association for Energy Economics , 2016, s. 1-28Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Climate policy, like climate change itself, is subject to debate. Partially due to the political deadlock in Washington, DC, US climate policy, historically, has been driven mainly by state or regional effort until the recently introduced federal Clean Power Plan (CPP). Instead of a traditional mass-based standard, the US CPP stipulates a state-specific performance-based CO2 emission standard and delegates considerable flexibility to the states in achieving the standard. Typically, there are two sets of policy tools available: a tradable performance-based and a mass-based permit program. We analyze these two related but distinct standards when they are subject to imperfect competition in the product and/or permit markets. Stylized models are developed to produce general conclusions. Detailed models that account for heterogenous technologies and the transmission network are developed to evaluate policy efficiency. Depending on the scenarios under consideration, the resulting problem could be either a complementarity problem or a Stackelberg leaderfollower game, which is implemented as a mathematical program with equilibrium constraints (MPEC). We overcome the nonconvexity of MPECs by reformulating them as mixed integer problems. We show that while the cross-subsidy inherent in the performance-based standard that might effectively reduce power prices, it could inflate energy demand, thereby rendering permits scarce. When the leader in a Stackelberg formulation has a relatively clean endowment under the performancebased standard, its ability to manipulate the electricity market as well as to lower permit prices might worsen the market outcomes compared to its mass-based counterpart. On the other hand, when the leader has a relatively dirty endowment, the "cross-subsidy" could be the dominant force leading to a higher social welfare compared to the mass-based program. This paper contributes to the current policy debates in regulating emissions from the US power sector and highlights different incentives created by the mass- and performance-based standards.

  • 460. Chibas, Åsa
    et al.
    Nouri, Jalal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Norén, Eva
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för matematikämnets och naturvetenskapsämnenas didaktik.
    Zhang, Lechen
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Sjöberg, Christer
    Didactical strategies and challenges when teaching programming in pre-school2018Ingår i: EDULEARN18: Proceedings, The International Academy of Technology, Education and Development, 2018, s. 3345-3350Konferensbidrag (Refereegranskat)
    Abstract [en]

    Many countries around the world have introduced programming curriculum at K-9 level. For a number of years, a lot of studies have surfaced demonstrating enactments of programming education, for instance through the use of visual programming languages as Scratch in different contexts. However, these studies have had a dominating focus on students of age 7 and older and there are few studies reporting on implementation of programming activities for younger children at preschool. This gap is addressed by this study that focus exclusively on learning of programming in a preschool class of six year olds. We have followed one teacher during six months conducting both classroom observations and interviews. In this paper we report on the didactical methods the teacher used when teaching programming through unplugged (analogue) means, with BlueBot robots, and through Scratch Jr. We end the paper by a discussion reflecting on challenges and lessons learned in relation to introducing programming for young children.

  • 461. Chopra, Amit
    et al.
    van der Torre, LeendertVerhagen, HarkoStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Villata, Serena
    Handbook of Normative Multiagent Systems2018Samlingsverk (redaktörskap) (Övrigt vetenskapligt)
  • 462. Chopra, Amit
    et al.
    van der Torre, LeonVerhagen, HarkoStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Villata, Serena
    Normative Multi-Agent Systems: Report from Dagstuhl Seminar 151312015Proceedings (redaktörskap) (Refereegranskat)
    Abstract [en]

    This report documents the program and the outcomes of Dagstuhl Seminar 15131 “Normative Multi-Agent Systems”. Normative systems are systems in the behavior of which norms play a role and which need normative concepts in order to be described or specified. A normative multi-agent system combines models for normative systems (dealing for example with obligations, permissions and prohibitions) with models for multi-agent systems. Normative multi-agent systems provide a promising model for human and artificial agent coordination because they integrate norms and individual intelligence. They are a prime example of the use of sociological theories in multi- agent systems, and therefore of the relation between agent theory—both multi-agent systems and autonomous agents—and the social sciences—sociology, philosophy, economics, legal science, etc. The aim of this Dagstuhl Seminar was to feature two fresh themes in broader computing and software engineering: social computing and governance. These themes are highly interdis- ciplinary, bringing together research strands from computing, information sciences, economics, sociology, and psychology. Further there is considerable excitement about these areas in aca- demia, industry, and public policy organizations. Our third theme was agreement technologies, a more traditional topic but nonetheless relevant for the NorMAS community. A norm is a fun- damental social construct. Norms define the essential fabric of a society. Our purpose in this seminar was to explore the connections of norms to each of the themes, especially from a com- putational perspective. Moreover, the seminar has been conceived for the writing of a volume titled “Handbook of Normative Multi Agent Systems” aimed to become a standard reference in the field and to provide guidelines for future research in normative multi-agent systems.

  • 463. Chronoopoulos, Michail
    et al.
    De Reyck, Bert
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, UK.
    The value of capacity sizing under risk aversion and operational flexibility2013Ingår i: IEEE transactions on engineering management, ISSN 0018-9391, E-ISSN 1558-0040, Vol. 60, nr 2, s. 272-288Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Risk aversion typically erodes the value of an investment opportunity, often increasing the incentive to delay investment. Although this may be true when the decision maker has discretion only over the timing of investment, any additional discretion over the capacity of a project may lead to different results. In this paper, we extend the traditional real options approach by allowing for discretion over capacity while incorporating risk aversion and operational flexibility in the form of suspension and resumption options. In contrast to a project without scalable capacity, we find that increased risk aversion may actually facilitate investment because it decreases the optimal capacity of the project. Finally, we illustrate how the relative loss in the value of the investment opportunity due to an incorrect capacity choice may become less pronounced with increasing risk aversion and uncertainty.

  • 464. Chronopoulos, Michail
    et al.
    Bunn, Derek
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, UK.
    Optionality and Policymaking in Re-Transforming the British Power Market2014Ingår i: Economics of Energy & Environmental Policy, ISSN 2160-5882, E-ISSN 2160-5890, Vol. 3, nr 2, s. 79-100Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Conventional models to support policymaking for the energy sector have been largely based on deterministic or static settings that focus on planning welfare-maximising investment pathways. But, in a liberalised market, since investments are made by competitive, profit-maximising companies, the increased intervention of government policy in the trading arrangements creates uncertain responses to incentives. Industry may perceive policy risks to be high, and major companies may choose to act more cautiously than governments expect. This presents a modelling challenge, and we propose an extension to the use of real options in this context. We model several features of the low-carbon investment context, viz., irreversibility, delay, and competition, which impinge upon the radical policy imperatives for structural change in electricity markets to meet ambitious sustainability targets.

  • 465. Chronopoulos, Michail
    et al.
    De Reyck, Bert
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of London, England.
    Duopolistic competition under risk aversion and uncertainty2014Ingår i: European Journal of Operational Research, ISSN 0377-2217, E-ISSN 1872-6860, Vol. 236, nr 2, s. 643-656Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A monopolist typically defers entry into an industry as both price uncertainty and the level of risk aversion increase. By contrast, the presence of a rival typically hastens entry under risk neutrality. Here, we examine these two opposing effects in a duopoly setting. We demonstrate that the value of a firm and its entry decision behave differently with risk aversion and uncertainty depending on the type of competition. Interestingly, if the leader's role is defined endogenously, then higher uncertainty makes her relatively better off, whereas with the roles exogenously defined, the impact of uncertainty is ambiguous.

  • 466. Chronopoulos, Michail
    et al.
    De Reyck, Bert
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Optimal investment under operational flexibility, risk aversion, and uncertainty2011Ingår i: European Journal of Operational Research, ISSN 0377-2217, E-ISSN 1872-6860, Vol. 213, nr 1, s. 221-237Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Traditional real options analysis addresses the problem of investment under uncertainty assuming a risk-neutral decision maker and complete markets. In reality, however, decision makers are often risk averse and markets are incomplete. We confirm that risk aversion lowers the probability of investment and demonstrate how this effect can be mitigated by incorporating operational flexibility in the form of embedded suspension and resumption options. Although such options facilitate investment, we find that the likelihood of investing is still lower compared to the risk-neutral case. Risk aversion also increases the likelihood that the project will be abandoned, although this effect is less pronounced. Finally, we illustrate the impact of risk aversion on the optimal suspension and resumption thresholds and the interaction among risk aversion, volatility, and optimal decision thresholds under complete operational flexibility.

  • 467. Chronopoulos, Michail
    et al.
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, UK.
    When is it better to wait for a new version? Optimal replacement of an emerging technology under uncertainty2015Ingår i: Annals of Operations Research, ISSN 0254-5330, E-ISSN 1572-9338, Vol. 235, nr 1, s. 177-201Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Firms that use an emerging technology often face uncertainty in both the arrival of new versions and the revenue that may be earned from their deployment. Via a sequential decision-making framework, we determine the value of the investment opportunity and the optimal replacement rule under three different strategies: compulsive, laggard, and leapfrog. In the first one, a firm invests sequentially in every version that becomes available, whereas in the second and third ones, it first waits for a new version to arrive and then either invests in the older or the newer version, respectively. We show that, under a compulsive strategy, technological uncertainty has a non-monotonic impact on the optimal investment decision. In fact, uncertainty regarding the availability of future versions may actually hasten investment. By comparing the relative values of the three strategies, we find that, under a low output price the compulsive strategy always dominates, whereas, at a high output price, the incentive to wait for a new version and adopt either a leapfrog or a laggard strategy increases as the rate of innovation increases. By contrast, high price uncertainty mitigates this effect, thereby increasing the relative attraction of a compulsive strategy.

  • 468.
    Collin, Jonas
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Using hyperlinked video to increase motivation and learning: The HyperCaster approach2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    There is a challenge to create video technology and didactics that encourage knowledge building, takes advantage of the possibilities of new media and on the same time is easy to use by teachers. HyperCaster is an open source hypervideo player developed for education and science communication that takes up this challenge. This paper summarize the thoughts and the decisions behind the design and gives suggestions on how teachers can use hypervideo to create learning material. Using video is a great way of escaping the classroom getting into action; to meet real people involved in the subject such as experts, people with personal experience and role models. Furthermore video is great for visualizing complex processes. Internet users can however be very impatient and it's hard to make them watch long video episodes. Teachers can use interactive objects and hyperlinks in video to prepare their material for this restless behavior. Links in video opens the possibility to integrate with all the already existing resources out on the net. It's easy for teachers to place links and graphics directly in the content management system with the built-in editor instead of using advanced editing software. Thus it's easy to update the links and the graphics when the Internet resources change. The HyperCaster player aims to solve important usability issues associated with interactive video due to the temporal linking and the browsing between web pages. The technical development and the didactics has since 2001 evolved hand-in-hand throughout a series of development and information projects in cooperation with Stockholm university, Forskning.se, Sida and Harvard university. A demonstration of the HyperCaster system and the hypervideo content will be held during the presentation.

  • 469. Collins, Justin
    et al.
    Mottrie, Alexander
    Hosseini, Abolfazl
    Challacombe, Benjamin
    Adding, Christofer
    Dasgupta, Prokar
    Artibani, Walter
    Gaston, Richard
    Piechaud, Thierry
    Sooriakumaran, Prasanna
    Pini, Giovannalberto
    Nilsson, Andreas
    Fragkiadis, Evangelos
    Tewari, Ashutosh
    Badani, Ketan
    Gill, Inderbir
    Desai, Mihir
    Patel, Vipul
    Ahlawat, Rajesh
    Murphy, Declan
    Coelho, Rafael
    Rha, Koon
    Gandaglia, Giorgio
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Wiklund, Peter
    Live streaming of robotic surgery from leading educational centres enables a global approach to surgical teaching2016Ingår i: Journal of Urology, ISSN 0022-5347, E-ISSN 1527-3792, Vol. 195, nr 4, s. e116-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Following recently published EAU Policy on Live Surgical Events (LSE's) it is assured that live surgery will be ongoing at conferences in the immediate future. However, the panel reached >80% consensus view that performing at a home institution may be safer. The committee also identified issues with a ‘travelling surgeon’ performing complex surgery in an unfamiliar environment with a surgical team that is not experienced with the intricacies of surgeons techniques. LSE's from home institutions remove or minimize these negative aspects.

  • 470. Collins, Justin W.
    et al.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mottrie, Alexander
    Wiklund, Peter N.
    Application and Integration of Live Streaming from Leading Robotic Centres Can Enhance Surgical Education2015Ingår i: European Urology, ISSN 0302-2838, E-ISSN 1873-7560, Vol. 68, nr 5, s. 747-749Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Internet-based video-streaming enables us to share surgical knowledge and to study leading surgeons while they operate in their home institutions, and is widely accessible to trainees. Planned developments include enriched learning experiences with improved user friendliness, interactivity, and real-time feedback.

  • 471. Collins-Thompson, Kevyn
    et al.
    Hansen, Preben
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hauff, Claudia
    Search as Learning: Report from Dagstuhl Seminar 170922017Ingår i: Dagstuhl Reports, E-ISSN 2192-5283, Vol. 7, nr 2, s. 135-162Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This report describes the program and the results of Dagstuhl Seminar 17092 "Search as Learning", which brought together 26 researchers from diverse research backgrounds. The motivation for the seminar stems from the fact that modern Web search engines are largely engineered and optimized to fulfill lookup tasks instead of complex search tasks. The latter though are an essential component of information discovery and learning. The 3-day seminar started with four perspective talks, providing four different views on the topic of search as learning: interactive information retrieval (IR), psychology, education and system-oriented IR. The remainder of the seminar centered around breakout groups leading to new views on the challenges and issues in search as learning, interspersed with research spotlight talks.

  • 472.
    Colombage, Ranil Peiris
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Männikkö Barbutiu, Sirkku
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    About the challenges in undergraduate research projects: an explorative case study in a Sri Lankan National University2018Ingår i: International Journal of Learning, Teaching and Educational Research, ISSN 1694-2493, E-ISSN 1694-2116, Vol. 17, nr 2, s. 25-44Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Conducting research and writing a thesis about it is regarded as a distinctive pedagogy (learning through inquiry) within higher education which brings new challenges to all parties involved. To complete a thesis, students should select a problem, make a systematic plan, implement the plan and, finally, write a report of the process and findings. Students do have a supervisor to guide and support them, but it is the student who plays the key role in the whole research process. The present study is a qualitative, explorative case study to understand the challenges related to research projects within undergraduate management degree programmes in a Sri Lankan national University. Data have been collected using interviews and focus group discussions in six-degree programmes, with around 40 participants in total. The study focuses on identifying problematic areas and creating a general picture of why students’ research projects are not progressing favourably. Six main challenges were identified: student motivation, student-supervisor relationships, skills and knowledge, students’ workload, the structure of the research project course, and resources and ICT tools. These problematic areas are complex and multidimensional. Therefore, further studies are required to truly understand the complex interrelatedness of these areas.

  • 473. Conejo, Antonio J.
    et al.
    Baringo Morales, Luis
    Kazempour, S. Jalal
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Investment in Electricity Generation and Transmission: Decision Making under Uncertainty2016Bok (Övrigt vetenskapligt)
  • 474. Courteille, O
    et al.
    Ekblad, S
    Fors, Uno
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mollica, R
    Pantziaras, I
    Virtual Patients for training Patient Encounter in transcultural psychiatry: Enhancing learning outcomes in the affective domai2010Konferensbidrag (Övrigt vetenskapligt)
  • 475.
    Courteille, O
    et al.
    KI, , .
    Felländer-Tsai, L
    KI, , .
    Möller, H
    KI, , .
    Fors, Uno
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Virtual Cases and Interactive Simulations for Head and Neck Injuries - VIS-Ed2011Ingår i: AMEE 2011, 2011Konferensbidrag (Refereegranskat)
  • 476. Courteille, Olivier
    et al.
    Fahlstedt, Madelen
    Ho, Johnson
    Hedman, Leif
    Fors, Uno
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Von Holst, Hans
    Felländer-Tsai, Li
    Möller, Hans
    Learning through a virtual patient vs. recorded lecture: a comparison of knowledge retention in a trauma case2018Ingår i: International Journal of Medical Education, ISSN 2042-6372, E-ISSN 2042-6372, Vol. 9, s. 86-92Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objectives: To compare medical students' and residents' knowledge retention of assessment, diagnosis and treatment procedures, as well as a learning experience, of patients with spinal trauma after training with either a Virtual Patient case or a video-recorded traditional lecture. Methods: A total of 170 volunteers (85 medical students and 85 residents in orthopedic surgery) were randomly allocated (stratified for student/resident and gender) to either a video-recorded standard lecture or a Virtual Patient-based training session where they interactively assessed a clinical case portraying a motorcycle accident. The knowledge retention was assessed by a test immediately following the educational intervention and repeated after a minimum of 2 months. Participants' learning experiences were evaluated with exit questionnaires. A repeated-measures analysis of variance was applied on knowledge scores. A total of 81% (n = 138) of the participants completed both tests. Results: There was a small but significant decline in first and second test results for both groups (F-(1,F-135) = 18.154, p = 0.00). However, no significant differences in short-term and long-term knowledge retention were observed between the two teaching methods. The Virtual Patient group reported higher learning experience levels in engagement, stimulation, general perception, and expectations. Conclusions: Participants' levels engagement were reported in favor of the VP format. Similar knowledge retention was achieved through either a Virtual Patient or a recorded lecture.

  • 477. Courteille, Olivier
    et al.
    Felländer-Tsai, Li
    Hedman, Leif
    Kjellin, Ann
    Enochsson, Lars
    Lindgren, G
    Fors, Uno
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mixed Virtual Reality Simulation - Taking endoscopic simulation one step further2011Ingår i: Studies in Health Technology and Informatics, ISSN 0926-9630, E-ISSN 1879-8365, Vol. 163, s. 144-146Artikel i tidskrift (Refereegranskat)
  • 478. Coville, Aidan
    et al.
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Vogstad, Klaus-Ole
    The effect of missing data on wind resource estimation2011Ingår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 36, nr 7, s. 4505-4517Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Investment in renewable energy sources requires reliable data. However, meteorological datasets are often plagued by missing data, which can bias energy resource estimates if the missingness is systematic. We address this issue by considering the influence of missing data due to icing of equipment during the winter on the wind resource estimation for a potential wind turbine site in Norway. Using a mean-reverting jump-diffusion (MRJD) process to model electricity prices, we also account for the impact on the expected revenue from a wind turbine constructed at the site. While missing data due to icing significantly bias the wind resource estimate downwards, their impact on revenue estimates is dampened because of volatile electricity spot prices. By contrast, with low-volatility electricity prices, the effect of missing data on revenue estimates is highly significant. The seasonality-based method we develop removes most of the bias in wind resource and revenue estimation caused by missing data.

  • 479.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Büttner, Sebastian
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Things that Tweet, Check-In and are Befriended: Two Explorations on Robotics & Social Media. 2011Ingår i: HRI2011, Lausanne, Switzerland: ACM Press / IEEE , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    This late breaking report describes two explorations of effects of using social media in human-robot interaction. The first is an exploration of how ‘autonomous creatures’ can use information shared via social awareness streams by implementing a Nabaztag to use information from its ‘friends’ on location-sharing service foursquare. The second is an informal analysis of tweets sent to an existing robot-associated twitter account as a case. We show parallels to prior research and discuss questions that these simple explorations pose for the future of robots and social media.

  • 480. Cramer, Henriette
    et al.
    Mentis, Helena
    Fernaeus, Ylva
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Serious work on playful experiences: a preliminary set of challenges2010Konferensbidrag (Övrigt vetenskapligt)
  • 481.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Belloni, Nicolas
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bentley, Frank
    Chincholle, Didier
    Research in the Large: Using App Stores, Markets, and Other Wide Distribution Channels in Ubicomp Research2010Ingår i: UbiComp'10 - Proceedings of the 2010 ACM Conference on Ubiquitous Computing, Ney York: ACM Press , 2010, s. 511-514Konferensbidrag (Refereegranskat)
    Abstract [en]

    The mobile phones that people use in their daily lives now run advanced applications and come equipped with sensors once only available in custom hardware in UbiComp research. At the same time application distribution has become increasingly simple due to the proliferation of app stores and the like. Evaluation and research methods have to be adapted to this new context to get the best data and feedback from wide audiences. However, an overview of successful strategies to overcome research challenges inherent to wide deployment is not yet available. App store platform characteristics, devices, reaching target users, new types of evaluation data and dynamic, heterogeneous usage contexts have to be dealt with. This workshop provides a forum for researchers and developers to exchange experiences and strategies for wide distribution of applications. We aim at building an understanding of the opportunities of various distribution channels and obstacles involved in a research context

  • 482.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bentley, Frank
    Motorola Mobility.
    Guest editorial Preface on Special Issue: An Introduction to Research in the Large2011Ingår i: International Journal of Mobile Human Computer Interaction, ISSN 1942-390X, E-ISSN 1942-3918, nr Special issueArtikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Distribution of mobile applications has been greatly simplified by mobile app stores and markets. Both lone developers and large research and development teams can now relatively easily reach wide audiences. In addition, people’s mobile phones can now run advanced applications and are equipped with sensors that used to be available only in custom research hardware. This provides researchers with a huge opportunity to gather research data from a large public. Evaluation and research methods have to be adapted to this new context. However, an overview of successful strategies and ways to overcome the methodological challenges inherent to wide deployment in a research context is not yet available. A workshop was organized on this topic and this special issue to help address these topics. This introduction provides an overview of strategies and opportunities in ‘research in the large’, while providing an introduction to challenges in ethics and validity as well.

  • 483.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bentley, Frank
    Motorola Mobility, , .
    Ayman Shamma, David
    Yahoo! Research, , .
    2nd Workshop on Research in the Large: Using App Stores, Wide Distribution Channels and Big Data in UbiComp Research2011Ingår i: UbiComp2011, Beijing, China: ACM Press , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    With the proliferation of app stores and the advancement of mobile devices, research that might have only been tested with a dozen participants in the past can now be released to millions. This offers huge opportunities, but also requires adaptations of existing methods in dealing with large deployments and making sense of large data sets. This workshop provides a forum for researchers to exchange experiences and strategies for wide distribution of applications as well as gathering and analyzing the large- scale data sets the result from these deployments.

  • 484.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Holmquist, Lars-Erik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Performing a Check-in: Emerging Practices, Norms and ‘Conflicts’ in Location-Sharing Using Foursquare.2011Ingår i: Proceedings of the 13th Conference on Human-Computer Interaction with Mobile Devices and Services, Stockholm, Sweden: ACM , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Location-sharing services have a long history in research, but have only recently become available for consumers. Most popular commercial location-sharing services differ from previous research efforts in important ways: they use manual ‘check-ins’ to pair user location with semantically named venues rather than tracking; venues are visible to all users; location is shared with a potentially very large audience; and they employ incentives. By analysis of 20 in- depth interviews with foursquare users and 47 survey responses, we gained insight into emerging social practices surrounding location-sharing. We see a shift from privacy issues and data deluge, to more performative considerations in sharing one’s location. We discuss performance aspects enabled by check-ins to public venues, and show emergent, but sometimes conflicting norms (not) to check-in.

  • 485.
    Cramer, Henriette
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Holmquist, Lars-Erik
    SICS / Mobile Life, , .
    Services as Materials: Using Mashups for Research2011Ingår i: UbiComp2011, Beijing, China: ACM Press , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Using existing services as development and research materials can greatly reduce development burdens. However, using mashups and existing services has consequences that go beyond the technical realm. We present our ongoing experience with developing and promoting a mobile mash-up implemented in the mobile web browser: Spotisquare. Spotisquare is a mash-up of the location-based service foursquare and music streaming service Spotify. We discuss advantages and tradeoffs of using existing services and the mobile mash-up process, including interaction model choices, as well as validity and representational issues.

  • 486. Crelaard, Loes
    et al.
    Papapetrou, Panagiotis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Explainable predictions of adverse drug events from electronic health records via oracle coaching2018Konferensbidrag (Refereegranskat)
  • 487.
    Cumbi, Valter
    et al.
    UTICT, Mozambique.
    Chemane, Lourino
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mozambican Government Portal Case Study: Visitor Analysis2007Ingår i: IST-Africa 2007 Conference Proceedings / [ed] Paul Cunningham & Miriam Cunningham, 2007Konferensbidrag (Refereegranskat)
    Abstract [en]

    The e-Government initiative in Mozambique is an ambitious and far-reaching movement with immense potential for positive impact on the Mozambican government and economy. Central to this initiative is the Government Portal—a portal dedicated to intuitively and helpfully disseminating government news, services, and information to citizens, the public sector, and the private sector. Such an important project of the e-Government initiative requires frequent evaluation of the project performance and ways in which it can improve. This document attempts to measure the performance of the Government Portal through visitor analysis. It discusses the limitations of analysis through this approach, what can be deduced from the visitor analysis, and possible ideas to improve the project in an attempt to help it reach its objectives.

  • 488.
    Cunningham, Miriam
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Technology-Enhanced Learning in Kenyan Universities2016Ingår i: IEEE technology & society magazine, ISSN 0278-0097, E-ISSN 1937-416X, Vol. 35, nr 3, s. 28-35Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article discusses some of the findings of a study that bridges an existing knowledge gap by focusing on identifying influences on the wider adoption and uptake of TEL techniques by HEIs in Nairobi. In this context, TEL techniques can encompass e-learning, blended learning, using massive open online courses (MOOCs), or an entirely online course delivery. This study examines why HEIs are using TEL, perceived benefits and challenges of using TEL from an institutional and instructor perspective, and the impact of policies. The findings have important research, practical, societal, and policy making implications for educational delivery on a continent with a rapidly growing population. Findings will assist decision making, inform policy creation, and provide useful foundational reference material for further comparative research in Africa. The lessons learned will also assist tertiary level institutions across the African continent that wish to plan for wider TEL adoption, or to implement TEL in a more effective manner, by considering common challenges that could limit adoption.

  • 489.
    Cunningham, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Insights into Open Innovation and ICT Entrepreneurship in Africa2015Ingår i: 2015 IEEE International Symposium on Technology and Society (ISTAS): Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    Innovation and ICT entrepreneurship are slowly being recognised as important enablers of socio-economic growth and realising national strategic goals in African Member States. However, the level of practical skills capacity, indigenous entrepreneurial expertise and policy support to take full advantage of this at national level varies considerably. This research study focused on identifying factors impacting on the current level of open innovation and ICT entrepreneurship in Africa. It was informed by a semi-structured, moderated focus group which captured the perspectives of senior public and education and research stakeholders from eight African Member States. The results highlighted six main factors: (a) level of political will reflected by resource prioritisation; (b) alignment with national development plans and associated funding priorities; (c) level of understanding of strategic benefits by ministers and senior civil servants; (d) level of awareness and sensitization of the general public, (e) availability of national innovation and entrepreneurial expertise; and (f) willingness and capacity to cooperate with other stakeholders to achieve common goals. Future research will capture perspectives from the private, societal and international donor sectors, and create and validate potential models/methodologies to address the challenges and opportunities identified in this study.

  • 490.
    Cunningham, Paul
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cunningham, Miriam
    Stockholm University, Social Sciences, DSV.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Assessment of Potential ICT-Related Collaboration and Innovation Capacity in East Africa2015Ingår i: 2015 IEEE Global Humanitarian Technology Conference (GHTC), IEEE conference proceedings , 2015Konferensbidrag (Refereegranskat)
  • 491.
    Cunningham, Paul
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cunningham, Miriam
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Baseline Analysis of 3 Innovation Ecosystems in East Africa2014Ingår i: 2014 International Conference on Advances in ICT for Emerging Regions (ICTer), 2014, s. 156-162Konferensbidrag (Refereegranskat)
    Abstract [en]

    The potential impact of computing innovations supporting social and economic development (particularly in developing countries) is very dependent on the level of maturity of National Innovation Ecosystems (including policy environment, infrastructure and socio-economic diversification). East Africa has experienced significant growth in ICT-enabled Innovation (particularly mobile) in recent years. Kenya, Tanzania and Uganda have experienced considerable entrepreneurial growth, facilitated by Innovation friendly regulatory environments, evolution of National Research Education Networks (NReNs) and rollout of fibre optic backbones. While it is clear that ICT, Job Creation and developing a Knowledge Economy are common policy priorities, the Innovation Ecosystems in Nairobi, Dar es Salaam and Kampala are quite fragmented. While support for entrepreneurship is improving, Innovation Spaces have sustainability challenges with their business models and there is a limited availability of funding, and training and mentoring for entrepreneurs. Greater collaboration between different stakeholders and more efficient support systems are required to promote accelerated development. In this paper, we provide a survey of the key Innovation Stakeholders in Nairobi, Dar es Salaam and Kampala. This is based on semi-structured face to face interviews (November 2012 – February 2013), supplemented by IST-Africa Surveys, focus group engagement during Research and Innovation Stakeholder workshops, and supported by desk research, follow-up e-mails and telephone interviews to reflect developments up to July 2014.

  • 492.
    Cunningham, Paul
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cunningham, Miriam
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Factors Impacting on the Current Level of Open Innovation and ICT Entrepreneurship in Africa2016Ingår i: Electronic Journal of Information Systems in Developing Countries, ISSN 1681-4835, E-ISSN 1681-4835, Vol. 73Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Across Africa, Innovation and ICT entrepreneurship are increasingly recognised as important enablers of national and regional socio-economic growth. However, the level of skills capacity, indigenous entrepreneurial expertise and policy support varies considerably. This research study was informed by a semi-structured, moderated focus group involving five public and four education and research stakeholders from eight African Member States. It focused on identifying factors impacting on the current level of open innovation and ICT entrepreneurship in Africa. Organised in Lilongwe, Malawi on 08 May 2015 during IST-Africa Week 2015, a purposive approach was applied to identify the nine informants based on intensity sampling. The results highlighted six main factors: a) level of political will reflected by resource prioritisation; b) alignment with national development plans and associated funding priorities; c) level of understanding of strategic benefits by ministers and senior civil servants; d) level of awareness and sensitization of the general public, e) availability of national innovation and entrepreneurial expertise; and f) willingness and capacity to cooperate with other stakeholders to achieve common goals. Future research will capture perspectives from the private, societal and international donor sectors, and create and validate potential models/methodologies to address the challenges and opportunities identified in this study.

  • 493.
    Cunningham, Paul
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cunningham, Miriam
    Stockholm University, Social Sciences, DSV.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stakeholder Roles and Potential Models to Support Collaborative Open Innovation in East Africa2015Ingår i: 13th International Conference on Social Implications of Computers in Developing Countries (IFIP9.4), International Federation for Information Processing , 2015Konferensbidrag (Refereegranskat)
  • 494. Cöster, Mathias
    et al.
    Westelius, Alf
    Gullberg, Cecilia
    Wettergren, Gunnar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ekenberg, Love
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Organisering och digitalisering: att skapa värde i det 21:a århundradet2017Bok (Övrigt vetenskapligt)
    Abstract [sv]

    Digitaliseringen gör att förändringar sker allt snabbare. Förändringarna innebär stora möjligheter men lika stora risker. För att kunna utnyttja möjligheterna måste vi anpassa oss. Och vi måste göra det medvetet. Förändringarna ger organisationer bättre förutsättningar än någonsin för att lyckas, men för att lyckas behöver man förstå och utnyttja dem. Vissa klarar det, andra inte. Att digitalisera framgångsrikt är inte enkelt. Den här boken visar hur organisationer skapar värde i en digitaliserad verklighet. Boken går igenom digitalisering med utgångspunkt i vad en organisation egentligen är och vad den behöver. Den spänner över mål, affärsmodeller, strategier, organisering, beslut och projekt. Tyngdpunkten ligger på hur man strukturerar för att få effektivare beslutshantering och mer framgångsrika projektgenomföranden. Eftersom beslut och project är grundpelare för att kunna använda digitaliseringen. Boken lämpar sig särskilt väl för kurser i företagsekonomi, industriell ekonomi och data- och systemvetenskap. Men den vänder sig till alla som vill förstå hur organisationer ska hantera och dra nytta av digitaliseringen.

  • 495.
    Cöster, Rickard
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Algorithms and Representations for Personalised Information Access2005Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Personalised information access systems use historical feedback data, such as implicit and explicit ratings for textual documents and other items, to better locate the right or relevant information for individual users.

    Three topics in personalised information access are addressed: learning from relevance feedback and document categorisation by the use of concept-based text representations, the need for scalable and accurate algorithms for collaborative filtering, and the integration of textual and collaborative information access.

    Two concept-based representations are investigated that both map a sparse high-dimensional term space to a dense concept space. For learning from relevance feedback, it is found that the representation combined with the proposed learning algorithm can improve the results of novel queries, when queries are more elaborate than a few terms. For document categorisation, the representation is found useful as a complement to a traditional word-based one.

    For collaborative filtering, two algorithms are proposed: the first for the case where there are a large number of users and items, and the second for use in a mobile device. It is demonstrated that memory-based collaborative filtering can be more efficiently implemented using inverted files, with equal or better accuracy, and that there is little reason to use the traditional in-memory vector approach when the data is sparse. An empirical evaluation of the algorithm for collaborative filtering on mobile devices show that it can generate accurate predictions at a high speed using a small amount of resources.

    For integration, a system architecture is proposed where various combinations of content-based and collaborative filtering can be implemented. The architecture is general in the sense that it provides an abstract representation of documents and user profiles, and provides a mechanism for incorporating new retrieval and filtering algorithms at any time.

    In conclusion this thesis demonstrates that information access systems can be personalised using scalable and accurate algorithms and representations for the increased benefit of the user.

  • 496.
    Dahl, Anders
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Özkan, Atilla
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Pathology text mining - on Norwegian prostate cancer reports2016Ingår i: 2016 IEEE 32nd International Conference on Data Engineering Workshops (ICDEW): Proceedings, IEEE Computer Society, 2016, s. 84-87Konferensbidrag (Refereegranskat)
    Abstract [en]

    Pathology reports are written by pathologists, skilled physicians, that know how to interpret disorders in various tissue samples from the human body. To obtain valuable statistics on outcome of disorders, as for example cancer and effect of treatment, statistics are collected. Therefore, cancer pathology reports interpreted and coded into databases at cancer registries. In Norway is this task carried out by the Cancer Registry of Norway (Kreftregisteret) by 25 different human coders. There is a need to automate this process. The authors of this article received 25 prostate cancer pathology reports written in Norwegian from the Cancer Registry of Norway, each documenting various stages of prostate cancer and the corresponding correct manual coding. A rule-based algorithm was produced that processed the reports in order to prototype automation. The output of the algorithm was compared to the output of the manual coding. The evaluation showed an average F-Score of 0.94 on four of these data points namely Total Malign, Primary Gleason, Secondary Gleason and Total Gleason and a lower result with on average F-score of 0.76 on all ten data points. The results are in line with previous research.

  • 497.
    Dahl, Gudrun
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Socialantropologiska institutionen.
    Danielson, MatsStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Faculty of Social Sciences, Stockholm University: 1964-20142014Samlingsverk (redaktörskap) (Övrigt vetenskapligt)
  • 498.
    Dahlbäck, Nils
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hägglund, Sture
    Jansson, Carl-Gustaf R
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ohlsson, Kjell
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Severinsson-Eklundh, Kerstin
    HMI: The Graduate School for Human Machine Interaction2005Ingår i: CHI' 2005, 2005Konferensbidrag (Refereegranskat)
  • 499.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Clinical text retrieval: an overview of basic building blocks and applications2014Ingår i: Professional search in the modern world: COST action IC1002 on multilingual and multifaceted interactive information access / [ed] Georgios Paltoglou, Fernando Loizides, Preben Hansen, Springer , 2014, s. 147-165Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    This article describes information retrieval, natural language processing and text mining of electronic patient record text, also called clinical text. Clinical text is written by physicians and nurses to docu- ment the health care process of the patient. First we describe some char- acteristics of clinical text, followed by the automatic preprocessing of the text that is necessary for making it usable for some applications. We also describe some applications for clinicians including spelling and grammar checking, ICD-10 diagnosis code assignment, as well as other applications for hospital management such as ICD-10 diagnosis code validation and detection of adverse events such as hospital acquired infections. Part of the preprocessing makes the clinical text useful for faceted search, al- though clinical text already has some keys for performing faceted search such as gender, age, ICD-10 diagnosis codes, ATC drug codes, etc. Pre- processing makes use of ICD-10 codes and the SNOMED-CT textual descriptions. ICD-10 codes and SNOMED-CT are available in several languages and can be considered the modern Greek or Latin of medical language. The basic research presented here has its roots in the chal- lenges described by the health care sector. These challenges have been partially solved in academia, and we believe the solutions will be adapted to the health care sector in real world applications.

  • 500.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Improving search engine retrieval using a compound splitter for Swedish2005Ingår i: In the proceeding of Nodalida 2005 - 15th Nordic Conference on Computational Linguistics, 2005Konferensbidrag (Refereegranskat)
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