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  • 2501. Tselas, Nikolaos
    et al.
    Papapetrou, Panagiotis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Benchmarking Dynamic Time Warping on Nearest Neighbor Classification of Electrocardiograms2014Inngår i: Proceedings of the 7th International Conference on PErvasive Technologies Related to Assistive Environments, ACM Press, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The human cardiovascular system is a complicated structure that has been the focus of research in many different domains, such as medicine, biology, as well as computer science. Due to the complexity of the heart, even nowadays some of the most common disorders are still hard to identify. In this paper, we map each ECG to a time series or set of time series and explore the applicability of two common time series similarity matching methods, namely, DTW and cDTW, to the problem of ECG classification. We benchmark the two methods on four different datasets in terms of accuracy. In addition, we explore their predictive performance when various ECG channels are taken into account. The latter is performed using a dataset taken from Physiobank. Our findings suggest that different ECG channels are more appropriate for different cardiovascular malfunctions.

  • 2502.
    Tsirigos, Konstantinos D.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab). University of Thessaly, Greece .
    Elofsson, Arne
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Bagos, Pantelis G.
    PRED-TMBB2: improved topology prediction and detection of beta-barrel outer membrane proteins2016Inngår i: Bioinformatics, ISSN 1367-4803, E-ISSN 1367-4811, Vol. 32, nr 17, s. 665-671Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Motivation: The PRED-TMBB method is based on Hidden Markov Models and is capable of predicting the topology of beta-barrel outer membrane proteins and discriminate them from water-soluble ones. Here, we present an updated version of the method, PRED-TMBB2, with several newly developed features that improve its performance. The inclusion of a properly defined end state allows for better modeling of the beta-barrel domain, while different emission probabilities for the adjacent residues in strands are used to incorporate knowledge concerning the asymmetric amino acid distribution occurring there. Furthermore, the training was performed using newly developed algorithms in order to optimize the labels of the training sequences. Moreover, the method is retrained on a larger, non-redundant dataset which includes recently solved structures, and a newly developed decoding method was added to the already available options. Finally, the method now allows the incorporation of evolutionary information in the form of multiple sequence alignments. Results: The results of a strict cross-validation procedure show that PRED-TMBB2 with homology information performs significantly better compared to other available prediction methods. It yields 76% in correct topology predictions and outperforms the best available predictor by 7%, with an overall SOV of 0.9. Regarding detection of beta-barrel proteins, PRED-TMBB2, using just the query sequence as input, achieves an MCC value of 0.92, outperforming even predictors designed for this task and are much slower.

  • 2503.
    Tsirigos, Konstantinos D.
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Hennerdal, Aron
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Käll, Lukas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Elofsson, Arne
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik. Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    A guideline to proteome-wide alpha-helical membrane protein topology predictions2013Inngår i: Proteomics, ISSN 1615-9853, E-ISSN 1615-9861, Vol. 12, nr 14, s. 2282-2294Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    For current state-of-the-art methods, the prediction of correct topology of membrane proteins has been reported to be above 80%. However, this performance has only been observed in small and possibly biased data sets obtained from protein structures or biochemical assays. Here, we test a number of topology predictors on an unseen set of proteins of known structure and also on four genome-scale data sets, including one recent large set of experimentally validated human membrane proteins with glycosylated sites. The set of glycosylated proteins is also used to examine the ability of prediction methods to separate membrane from nonmembrane proteins. The results show that methods utilizing multiple sequence alignments are overall superior to methods that do not. The best performance is obtained by TOPCONS, a consensus method that combines several of the other prediction methods. The best methods to distinguish membrane from nonmembrane proteins belong to the Phobius group of predictors. We further observe that the reported high accuracies in the smaller benchmark sets are not quite maintained in larger scale benchmarks. Instead, we estimate the performance of the best prediction methods for eukaryotic membrane proteins to be between 60% and 70%. The low agreement between predictions from different methods questions earlier estimates about the global properties of the membrane proteome. Finally, we suggest a pipeline to estimate these properties using a combination of the best predictors that could be applied in large-scale proteomics studies of membrane proteins.

  • 2504. Tully, Philip J.
    et al.
    Lindén, Henrik
    Hennig, Matthias H.
    Lansner, Anders
    Stockholms universitet, Naturvetenskapliga fakulteten, Numerisk analys och datalogi (NADA). Royal Institute of Technology (KTH), Sweden; Karolinska Institute, Sweden.
    Spike-Based Bayesian-Hebbian Learning of Temporal Sequences2016Inngår i: PloS Computational Biology, ISSN 1553-734X, E-ISSN 1553-7358, Vol. 12, nr 5, artikkel-id e1004954Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Many cognitive and motor functions are enabled by the temporal representation and processing of stimuli, but it remains an open issue how neocortical microcircuits can reliably encode and replay such sequences of information. To better understand this, a modular attractor memory network is proposed in which meta-stable sequential attractor transitions are learned through changes to synaptic weights and intrinsic excitabilities via the spike-based Bayesian Confidence Propagation Neural Network (BCPNN) learning rule. We find that the formation of distributed memories, embodied by increased periods of firing in pools of excitatory neurons, together with asymmetrical associations between these distinct network states, can be acquired through plasticity. The model's feasibility is demonstrated using simulations of adaptive exponential integrate-and-fire model neurons (AdEx). We show that the learning and speed of sequence replay depends on a confluence of biophysically relevant parameters including stimulus duration, level of background noise, ratio of synaptic currents, and strengths of short-term depression and adaptation. Moreover, sequence elements are shown to flexibly participate multiple times in the sequence, suggesting that spiking attractor networks of this type can support an efficient combinatorial code. The model provides a principled approach towards understanding how multiple interacting plasticity mechanisms can coordinate hetero-associative learning in unison.

  • 2505.
    Tyrcha, Joanna
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Matematiska institutionen.
    Roudi, Yasser
    Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Kavli Institute for Systems Neuroscience, NTNU, Norway.
    Marsili, Matteo
    Hertz, John
    Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Niels Bohr Institute, Denmark.
    The effect of nonstationarity on models inferred from neural data2013Inngår i: Journal of Statistical Mechanics: Theory and Experiment, ISSN 1742-5468, E-ISSN 1742-5468, artikkel-id P03005Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Neurons subject to a common nonstationary input may exhibit a correlated firing behavior. Correlations in the statistics of neural spike trains also arise as the effect of interaction between neurons. Here we show that these two situations can be distinguished with machine learning techniques, provided that the data are rich enough. In order to do this, we study the problem of inferring a kinetic Ising model, stationary or nonstationary, from the available data. We apply the inference procedure to two data sets: one from salamander retinal ganglion cells and the other from a realistic computational cortical network model. We show that many aspects of the concerted activity of the salamander retinal neurons can be traced simply to the external input. A model of non-interacting neurons subject to a nonstationary external field outperforms a model with stationary input with couplings between neurons, even accounting for the differences in the number of model parameters. When couplings are added to the nonstationary model, for the retinal data, little is gained: the inferred couplings are generally not significant. Likewise, the distribution of the sizes of sets of neurons that spike simultaneously and the frequency of spike patterns as a function of their rank (Zipf plots) are well explained by an independent-neuron model with time-dependent external input, and adding connections to such a model does not offer significant improvement. For the cortical model data, robust couplings, well correlated with the real connections, can be inferred using the nonstationary model. Adding connections to this model slightly improves the agreement with the data for the probability of synchronous spikes but hardly affects the Zipf plot.

  • 2506.
    Tyseng, Daniel
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Utveckling av tjänster för ett mobilt medium2004Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [sv]

    The mobile revolution is here to stay, and today most people have (at least) one cell phone at home. Some even a PDA (Personal Digital Assistant)as a complement for the simpler tasks at the office, e.g sending e-mail, word processing, browsing the Internet etc. Many business have also given the employees the opportunity to do some of the business tasks inbetweeen customer visits with the help from a cell phone or PDA.

    Despite all this, the so called Internet connected mobile revolution is often mentioned as a big failure. Maybe because the people in general tended not to use the new technology as much as the companies predicted. This could be because they still haven't learned how it works, or just don't seem to have the need for services provided.

    After a couple of failures in the development process, almost every cell phone has support for mobile Internet today. Instead the responsibility lies on the content providers and cell phone operators. The users are going to need killer applications, e.g. services as e-mail, chat, time tables, services they feel they can't be without. How is a service like this created then? And what kind of obstacles lies in the way of making this service available for everyone that uses a cell phone - not only the technical ones? What kind of responsibility do the operators have?

    To change from the Internet based platform to the mobile platform could contain some difficult tasks. Even if some technical issues occured during the project, the main challenge is not the technical one. In fact, the technical issues should not be a problem for companies already working with Internet technology.

  • 2507.
    Täckström, Oscar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hassel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Eriksson, Gunnar
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Karlgren, Jussi
    Uncertainty Detection as Approximate Max-Margin Sequence Labelling2010Inngår i: Proceedings of the Fourteenth Conference on Computational Natural Language Learning, Association for Computational Linguistics , 2010Konferansepaper (Annet vitenskapelig)
  • 2508.
    Uimonen, Paula
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    African art students and digital learning2011Inngår i: Interactive Media Use and Youth: Learning, Knowledge Exchange and Behavior / [ed] Elza Dunkels, Gun-Marie Frånberg, and Camilla Hällgren, ed., Hershey, PA: Information Science Reference , 2011, nr 1, s. 222-239Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    Imagine 120 students sharing 5 computers, yet feeling that they are part of an interconnected world. This is the social context framing digital learning for African art students, the material limitations and cultural imaginations of which this chapter is concerned with. Based on extensive ethnographic engagements at TaSUBa, a national institute for arts and culture in Tanzania, this chapter investigates the development of digital media skills. Using the concept of digital learning to cover the acquisition of ICT skills as well as the use of ICT as a learning tool, the analysis spans from early expectations of connectivity to current forms of media engagement. Focusing on the social and cultural aspects of digital learning, the concept hybrid media engagement is introduced to capture the creative ways in which African art students overcome limitations in infrastructure, while exploring new forms of cultural production.

  • 2509.
    Uimonen, Paula
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Digital Drama: Teaching and Learning Art and Media in Tanzania2012Bok (Annet vitenskapelig)
    Abstract [en]

    The aim of this book is to explore digital media and intercultural interaction at an arts college in Tanzania through innovative forms of ethnographic representation. The book and the series website weave together visual and aural narratives, interviews and observations, life stories and video documentaries, art performances and productions. It paints a vivid portrayal of everyday life in East Africa's only institute for practical art training, while tracing the rich cultural history of a state that has mixed tribalism, nationalism, Pan-Africanism, and cosmopolitanism in astonishingly creative ways. While following the anthropological tradition of thick description, Digital Drama employs a more artistic and accessible style of writing. Dramatic, ethnographic details are interspersed with theoretical postulations to explain and make sense of the unfolding narratives. The accompanying website visualizes and sensualizes the stories narrated in the book, unfolding a dramatic world of African dance, music, theater, and digital culture.

  • 2510.
    Uimonen, Paula
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Social and Mobile Media in ICT4D2012Inngår i: Social Media in Development Cooperation: Ørecomm - Centre for Communication and Glocal Change / [ed] Ricky Storm Braskov, Malmö: Ørecomm at Malmö University and Roskilde University , 2012, s. 20-28Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Can Facebook, Twitter, and mobile phones change the world? Obviously not! But there is something to be said for social networking sites, online news feeds, and mobile communication when it comes to ICT for Development (ICT4D). This paper will identify some key features of social and mobile media and relate these to social and political change, while paying attention to global patterns of digital stratification. Spider-supported projects that aim to use blogs and mobile phones in the fight against corruption in Africa will be used to illustrate and concretize opportunities as well as challenges. Reflections on how a networked organization like Spider can benefit from social media will be combined with a self-critical assessment of some pitfalls involved.

  • 2511.
    ul Muntaha, Sidrat
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Skeppstedt, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Entity Recognition of Pharmaceutical Drugs in Swedish Clinical Text2012Inngår i: Proceedings of the Conference, 2012, s. 77-78Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An entity recognition system for expressions of pharmaceutical drugs, based on vocabulary lists from FASS, the Medical Subject Headings and SNOMED~CT, achieved a precision of 94\% and a recall of 74\% when evaluated on assessment texts from Swedish emergency unit health records.

  • 2512. Ullah, Ikram
    et al.
    Sjöstrand, Joel
    Stockholms universitet, Naturvetenskapliga fakulteten, Numerisk analys och datalogi (NADA). Stockholms universitet, Science for Life Laboratory (SciLifeLab).
    Andersson, Peter
    Sennblad, Bengt
    Lagergren, Jens
    Integrating Sequence Evolution into Probabilistic Orthology Analysis2015Inngår i: Systematic Biology, ISSN 1063-5157, E-ISSN 1076-836X, Vol. 64, nr 6, s. 969-982Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Orthology analysis, that is, finding out whether a pair of homologous genes are orthologs - stemming from a speciation - or paralogs - stemming from a gene duplication - is of central importance in computational biology, genome annotation, and phylogenetic inference. In particular, an orthologous relationship makes functional equivalence of the two genes highly likely. A major approach to orthology analysis is to reconcile a gene tree to the corresponding species tree, (most commonly performed using the most parsimonious reconciliation, MPR). However, most such phylogenetic orthology methods infer the gene tree without considering the constraints implied by the species tree and, perhaps even more importantly, only allow the gene sequences to influence the orthology analysis through the a priori reconstructed gene tree. We propose a sound, comprehensive Bayesian Markov chain Monte Carlo-based method, DLRSOrthology, to compute orthology probabilities. It efficiently sums over the possible gene trees and jointly takes into account the current gene tree, all possible reconciliations to the species tree, and the, typically strong, signal conveyed by the sequences. We compare our method with PrIME-GEM, a probabilistic orthology approach built on a probabilistic duplication-loss model, and MRBAYESMPR, a probabilistic orthology approach that is based on conventional Bayesian inference coupled with MPR. We find that DLRSOrthology outperforms these competing approaches on synthetic data as well as on biological data sets and is robust to incomplete taxon sampling artifacts.

  • 2513.
    Uppström, Elin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Designing, Theorizing, and Reflecting on Information Systems Artifacts and Value Co-Creation in e-Government2017Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    E-government services in the form of information systems (IS) artifacts create a new arena for co-creation that governments aim to leverage. Design of and knowledge about IS artifacts in value co-creation in e-government can thereby be considered valuable for the future development of e-government. How IS artifacts are used in value co-creation and co-destruction and how the artifacts are developed is however not well understood.

    This thesis addresses the problem of how to design for and understand value co-creation in e-government. To address the problem stated, three research questions are posed. (i) How can IS artifacts be designed to enable value co-creation in e-government and what aspects can inhibit value being co-created through the designed artifacts? (ii) How can boundary object theory facilitate the understanding of IS artifacts used in value co-creation and co-destruction in e-government? (iii) How can retrospectives in design science contribute to research on value co-creation in e-government?

    Two artifacts in the form of instantiations are designed and evaluated. Design science research methodology is used in two different projects at Swedish municipalities. Secondary analysis is used to identify aspects that inhibit value being co-created through the designed IS artifacts. From these inhibitors, core aspects for public value co-creation are derived. Thereafter, this thesis delves further into how IS artifacts are used in collaborations between citizens, private businesses, and government agencies in order to co-create value. Two case studies are carried out at Swedish government agencies and sociomaterial boundary object theory is used to enhance understanding. The thesis research process ends with a retrospective evaluation of the performed research, using critical realism as its philosophical foundation and guidance.

    The result includes one configurable process model that enables value co-creation by facilitating shared understanding between collaborating parties; one mobile service that enables value co-creation through citizen sourcing; aspects that inhibit the realization of co-created value; and four core aspects that need to be considered when designing artifacts for value co-creation. That IS artifacts can be regarded as boundary objects when you aim to study and understand value co-creation and co-destruction between communities in e-government. Descriptions of how IS artifacts, viewed as sociomaterial boundary objects, are used in value co-creation processes between governments, citizens, and businesses and outcomes in terms of value co-creation and co-destruction. The benefit of performing critical realism-guided retrospectives in design science in order to complement prescriptive knowledge with explanatory and critical knowledge is motivated. It is showed that the design of artifacts generates knowledge through the design efforts, regardless of whether they also yield utility.

    This thesis contributes to e-government research and practice with knowledge on how to design artifacts that enable value co-creation. Establishes sociomaterial boundary object theory as a theoretical lens that offers a tool to evaluate and design IS artifacts that enable value co-creation and with knowledge on how IS artifacts are used in value co-creation. The thesis also motivates the usefulness of retrospective evaluation in design science. Suggestions for future research include further developing design science retrospectives. 

  • 2514.
    Uppström, Elin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Re-Visiting IS Design Science Artifacts: Making a Case for Critical Realism2017Inngår i: Proceedings of the 50th Hawaii International Conference on System Sciences (HICSS 2017), 2017, s. 4675-4684Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper critical realism is suggested as a suitable philosophical assumption to guide a separate, stand-alone retrospective evaluation of design science projects and artifacts. A main contribution of the paper is to argue that knowledge can be gained in retrospective evaluations of design science projects regardless of the success or nonsuccess of the project itself. Thereby, retrospective evaluation complements current evaluations that are mostly means-end focused. The argumentation is supported through re-visiting two e-government design science projects, which can be considered both as failures and successes depending on the framing. Critical realism puts focus on knowing through making and widens the use of design science in areas where utility is not the main goal. Future research should focus on providing more details on how a critical realism retrospective in design science should be carried out.

  • 2515.
    Uppström, Elin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    The Promise of Public Value Co-Creation in Open Government: Designing IT Services for Open Government and Public Value Co-Creation2014Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The engagement of citizens in governmental actives is the future of publicsector reforms. The private sector has already started to leverage onlinetechnology to innovate and to reinvent businesses. The move towards servicesexchange instead of goods exchange is making producers, providersand users cooperate to recognize and exploit value co-creation opportunities.The degree to which collective intelligence is leveraged could be correlatedto the value an initiative generates in the public sector. Thereby open governmentimplies a focus on value co-creation in the public sector. This thesisargues that an important purpose of opening up governments towards citizensand private business is to leverage the potential of value co-creation in asimilar fashion to that already being explored in the private sector. To explorethis phenomenon this thesis addresses the following research question:How can local government use IT services to become more open and leveragethe potential of public value co-creation?Utilizing a design science approach with interpretive philosophical assumptions,the thesis contributes to knowledge on open government and value cocreationby designing artifacts that support open government in the form ofe- and m-services. It also investigates inhibitors of public value co-creationthat may arise from the design of the artifacts.

  • 2516.
    Uppström, Elin
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Lönn, Carl-Mikael
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Explaining value co-creation and co-destruction in e-government using boundary object theory2017Inngår i: Government Information Quarterly, ISSN 0740-624X, E-ISSN 1872-9517, Vol. 34, nr 3, s. 406-420Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This article contributes to the understanding of e-government collaboration, value co-creation and co-destruction when using information systems (IS) artifacts. This is achieved through case study research, based on collaborations between the Swedish Forest Agency and external communities that were intended to co-create value. The collaborations were supported by an IS environment, comprising two IS artifacts that has been in use for several years. The analysis was based on sociomaterial boundary object theory. The philosophical framework underpinning the investigation of the interplay between technological and social aspects of the IS-enabled co-creation processes, i.e. the collaborations, was critical realism. The purpose of this article is, therefore, to analyze the co-creation processes supported by the IS artifacts (viewed as boundary objects) and to consider the outcomes, in terms of value co-creation and co-destruction, of the collaborations.The results show that value is both co-created and co-destroyed in the collaborative processes. The main conclusions are: (i) it is difficult to define value co-creation and co-destruction when the boundaries between collaborating communities are complex; (ii) when boundaries are complex, collaboration requires complex IS artifacts; (iii) the risk of co-destruction outcomes increases with boundary complexity. Finally, the article demonstrates that sociomaterial boundary objects provide a suitable theoretical framework for investigations of value co-creation and co-destruction through IS artifacts in e-government.

  • 2517.
    Uppström, Elin
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Lönn, Carl-Mikael
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    The Promise of a Crowd2013Inngår i: AMCIS 2013 Proceedings, Association for Information Systems, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents an evaluation of a mobile complaint and problem-reporting solution made for Swedish municipalities and their citizens. The evaluation is made through a government 2.0 framework to assess the appropriateness of the initiative as a citizen-sourcing solution. The research approach consists of a secondary analysis of empirical data. The researchers have been active participants in gathering the data for the secondary analysis. The results show that although the promise of the crowd is very prominent in the technical platform, municipalities are not prepared to fully utilize the citizen-sourcing solution. The main contribution for research is a widening of the body of knowledge regarding citizen-sourcing by an empirical application of a previously developed theoretical citizen-sourcing framework. The paper contributes to society and practice through highlighting difficulties that can be expected when realizing the promise of the crowd.

  • 2518.
    Uppström, Elin
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Lönn, Carl-Mikael
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hoffsten, Madeleine
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Thorström, Joakim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    New Implications for Customization of ERP Systems2015Inngår i: Proceedings of the 48th Annual Hawaii International Conference on System Sciences (HICSS 2015) / [ed] Tung X. Bui, Ralph H. Sprague, Jr. Los Alamitos,, IEEE Computer Society, 2015, s. 4220-4229Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Enterprise Resource Planning (ERP) Systems are standardized software packages intended to support the majority or all of an organization's processes. Customization of an ERP system is usually required to achieve fit between system and business processes of an organization. Customization options ranges from setting parameters in the system to developing new functionality by modifying source code. Models describing customization options are a decade old. Since then, the trend is for ERP systems to become more flexible. The feasibility of customization is facilitated and new options for customization are made available. Through in depth interviews, this research identifies a need for revising existing models. Presents necessary changes and proposes new customization options that should be included in a new model. There is also a need for customization models for different types of ERP systems. This paper therefore also contributes with describing how customization of cloud ERP relates to existing models.

  • 2519.
    Uppström, Elin
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Nilsson, Andreas
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Modeling IT-mediated value encounters between citizens and local government2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Cocreation of value in inter-organizational contexts is an increasingly common phenomenon. There is a lack of empirically grounded research regarding value cocreation in social contexts where meetings are mediated by IT. Through a case study of a e-government project, cocreation between citizens and local government is explored. The value encounter model is used as a tool for modeling cocreation. Results show that the model is able to capture significant cocreation activities, but miss some of the key values from the IT-system. The study recommends future research towards complementing the value encounter model with an “IT-object” and recommend investigating the Platform as a service field for inspiration.

  • 2520. Utka, A.
    et al.
    Grigonyté, GintaréStockholms universitet, Humanistiska fakulteten, Institutionen för lingvistik, Avdelningen för datorlingvistik.Kapočiūtė-Dzikienė, J.Vaičenonienė, J.
    Human Language Technologies – The Baltic Perspective: Proceedings of the Sixth International Conference Baltic HLT 20142014Konferanseproceedings (Fagfellevurdert)
    Abstract [en]

    This book contains papers from the Fourth International Conference on Human Language Technologies - the Baltic Perspective (Baltic HLT 2010), held in Riga in October 2010. This conference is the latest in a series which provides a forum for sharing recent advances in human language processing, and promotes cooperation between the computer science and linguistics communities of the Baltic countries and the rest of the world. Bringing together scientists, developers, providers and users, the conference is an opportunity to exchange information, discuss problems, find new synergies and promote initiatives for international cooperation.

    The 32 papers collected have been submitted by 77 authors from 11 countries, after review by an international program committee. They cover a wide range of research topics in corpus linguistics, machine translation, speech technologies, semantics and other areas of HLT research. This proceedings reflects the current state of HLT in the Baltic countries and the work towards creating a Baltic linguistic infrastructure. Human Language Technologies – The Baltic Perspective is a useful and comprehensive repository of information and will facilitate further research and development of HLT in the Baltic region, and the creation of a pan-European research infrastructure of the language resources and technology.

  • 2521. van Benthem, Johan
    et al.
    Bezhanishvili, Nick
    Enqvist, Sebastian
    Stockholms universitet, Humanistiska fakulteten, Filosofiska institutionen.
    A New Game Equivalence and its Modal Logic2017Inngår i: Electronic Proceedings in Theoretical Computer Science, ISSN 2075-2180, E-ISSN 2075-2180, nr 251, s. 57-74Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We revisit the crucial issue of natural game equivalences, and semantics of game logics based on these. We present reasons for investigating finer concepts of game equivalence than equality of standard powers, though staying short of modal bisimulation. Concretely, we propose a more fine-grained notion of equality of 'basic powers' which record what players can force plus what they leave to others to do, a crucial feature of interaction. This notion is closer to game-theoretic strategic form, as we explain in detail, while remaining amenable to logical analysis. We determine the properties of basic powers via a new representation theorem, find a matching 'instantial neighborhood game logic', and show how our analysis can be extended to a new game algebra and dynamic game logic.

  • 2522.
    Van Gemert-Pijnen, Lisette
    et al.
    University of Twente - Enschede, The Netherlands, , .
    Hettinga, MarikeWindesheim University of Applied Sciences, The Netherlands, , .Smedberg, ÅsaStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    eTELEMED 2014, The Sixth International Conference on eHealth, Telemedicine, and Social Medicine2014Konferanseproceedings (Annet (populærvitenskap, debatt, mm))
  • 2523.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rusu, Lazar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A unified strategic business and IT alignment model: A study in the public universities of Nicaragua2010Inngår i: 16th Americas Conference on Information Systems (AMCIS 2010), AISeL , 2010Konferansepaper (Annet vitenskapelig)
  • 2524.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Plazaola, Leonel
    Una representación consolidada del alineamiento estratégico de los negocios y las tecnologías de la información2007Inngår i: Nexo, ISSN 1818-6742, E-ISSN 1995-9516, Nexo, Vol. 20Artikkel i tidsskrift (Annet vitenskapelig)
  • 2525.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Semantic Annotations in Clinical Documentation: Exploring Potentials for Future Information Retrieval2010Konferansepaper (Annet vitenskapelig)
  • 2526.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Automatic Classification of Factuality Levels: A Case Study on Swedish Diagnoses and the Impact of Local Context2011Inngår i: The Fourth International Symposium on Languages in Biology and Medicine, Singapore, 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Clinicians express different levels of knowledge certainty when reasoning about a patient’s status. Automatic extraction of relevant information is crucial in the clinical setting, which means that factuality levels need to be distinguished. We present an automatic classifier using Conditional Random Fields, which is trained and tested on a Swedish clinical corpus annotated for factuality levels at a diagnosis statement level: the Stockholm EPR Diagnosis-Factuality Corpus. The classifier obtains promising results (best overall results are 0.699 average F-measure using all classes, 0.762 F-measure using merged classes), using simple local context features. Preceding context is more useful than posterior, although best results are obtained using a window size of +/-4. Lower levels of certainty are more problematic than higher levels, which was also the case for the human annotators in creating the corpus. A manual error analysis shows that conjunctions and other higher-level features are common sources of errors.

  • 2527.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Temporal Expressions in Swedish Medical Text - A Pilot Study2014Inngår i: Proceedings of BioNLP 2014: Workshop on Biomedical Natural Language Processing, Stroudsburg: Association for Computational Linguistics, 2014, s. 88-92Konferansepaper (Fagfellevurdert)
  • 2528.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Towards A Better Understanding of Uncertainties and Speculations in Swedish Clinical Text – Analysis of an Initial Annotation Trial2010Inngår i: Proceedings of the Workshop on Negation and Speculation in Natural Language Processing, University of Antwerpen , 2010, s. 14-22Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In view of the increasing need to facilitate processing the content of scientific papers, we present an annotation scheme for annotating full papers with zones of conceptualisation, reflecting the information structure and knowledge types which constitute a scientific investigation. The latter are the Core Scientific Concepts (CoreSCs) and include Hypothesis, Motivation, Goal, Object, Background, Method, Experiment, Model, Observation, Result and Conclusion. The CoreSC scheme has been used to annotate a corpus of 265 full papers in physical chemistry and biochemistry and we are currently automating the recognition of CoreSCs in papers. We discuss how the CoreSC scheme relates to other views of scientific papers and indeed how the former could be used to help identify negation and speculation in scientific texts.

  • 2529.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Automatic Construction of Domain-specific Dictionaries on Sparse Parallel Corpora in the Nordic languages2008Inngår i: Workshop MMIES-2: Multi-source, Multilingual Information Extraction and Summarization, Held in conjunction with COLING-2008, 2008Konferansepaper (Fagfellevurdert)
  • 2530.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Duneld, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Diagnosing Diagnoses in Swedish Clinical Records2008Inngår i: Proceedings of The First Conference on Text and Data Mining of Clinical Documents, Turku, Louhi'08, September 3-4 2008, pp. 110-112: Karsten, H. , B. Back, T. Salakoski, S. Salanterä and H. Suominen , 2008Konferansepaper (Fagfellevurdert)
  • 2531.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hassel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Nilsson, Gunnar
    Developing a standard for de-identifying electronic patient records written in Swedish: precision, recall and F-measure in a manual and computerized annotation trial2009Inngår i: International Journal of Medical Informatics, ISSN 1386-5056, E-ISSN 1872-8243, Vol. 78, nr 12, s. e19-e26Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background

    Electronic patient records (EPRs) contain a large amount of information written in free text. This information is considered very valuable for research but is also very sensitive since the free text parts may contain information that could reveal the identity of a patient. Therefore, methods for de-identifying EPRs are needed. The work presented here aims to perform a manual and automatic Protected Health Information (PHI)-annotation trial for EPRs written in Swedish.

    Methods

    This study consists of two main parts: the initial creation of a manually PHI-annotated gold standard, and the porting and evaluation of an existing de-identification software written for American English to Swedish in a preliminary automatic de-identification trial. Results are measured with precision, recall and F-measure.

    Results

    This study reports fairly high Inter-Annotator Agreement (IAA) results on the manually created gold standard, especially for specific tags such as names. The average IAA over all tags was 0.65 F-measure (0.84 F-measure highest pairwise agreement). For name tags the average IAA was 0.80 F-measure (0.91 F-measure highest pairwise agreement). Porting a de-identification software written for American English to Swedish directly was unfortunately non-trivial, yielding poor results.

    Conclusion

    Developing gold standard sets as well as automatic systems for de-identification tasks in Swedish is feasible. However, discussions and definitions on identifiable information is needed, as well as further developments both on the tag sets and the annotation guidelines, in order to get a reliable gold standard. A completely new de-identification software needs to be developed.

  • 2532.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Factuality Levels of Diagnoses in Swedish Clinical Text2011Inngår i: User Centred Networked Health Care - Proceedings of MIE 2011 / [ed] Anne Moen, Stig Kjær Andersen, Jos Aarts, Petter Hurlen, 2011, s. 559-563Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Different levels of knowledge certainty, or factuality levels, are expressed in clinical health record documentation. This information is currently not fully exploited, as the subtleties expressed in natural language cannot easily be machine analyzed. Extracting relevant information from knowledge-intensive resources such as electronic health records can be used for improving health care in general by e.g. building automated information access systems. We present an annotation model of six factuality levels linked to diagnoses in Swedish clinical assessments from an emergency ward. Our main findings are that overall agreement is fairly high (0.7/0.58 F-measure, 0.73/0.6 Cohen's κ, Intra/Inter). These distinctions are important for knowledge models, since only approx. 50% of the diagnoses are affirmed with certainty. Moreover, our results indicate that there are patterns inherent in the diagnosis expressions themselves conveying factuality levels, showing that certainty is not only dependent on context cues.

  • 2533.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Duneld, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Automatic Dictionary Construction and Identification of Parallel Text Pairs2008Inngår i: Proceedings of the International Symposium on Using Corpora in Contrastive and Translation Studies (UCCTS), 2008Konferansepaper (Fagfellevurdert)
  • 2534.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Duneld, MartinStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Henriksson, AronStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Kvist, MariaStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Skeppstedt, MariaStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Dalianis, HerculesStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Louhi 2014: Special issue on health text mining and information analysis2015Konferanseproceedings (Fagfellevurdert)
  • 2535.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Duneld, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henriksson, Aron
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Skeppstedt, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Louhi 2014: Special issue on health text mining and information analysis: introduction2015Inngår i: BMC Medical Informatics and Decision Making, ISSN 1472-6947, E-ISSN 1472-6947, Vol. 2, nr SI, s. 1-3Artikkel i tidsskrift (Fagfellevurdert)
  • 2536.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Hassel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Finding the Parallel: Automatic Dictionary Construction and Identification of Parallel Text Pairs2010Inngår i: Using Corpora in Contrastive and Translation Studies / [ed] edited by Richard Xiao, Newcastle: Cambridge Scholars Publishing , 2010Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 2537.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ibrahim, Omran
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Karolinska Institute, Sweden.
    Functions for personal health records in Sweden – patient perspectives2013Inngår i: Scandinavian Conference on Health Informatics 2013: Copenhagen, Denmark, August 20, 2013 / [ed] Gustav Bellika et al., Linköping: Linköping University Press , 2013, s. 95-95Konferansepaper (Fagfellevurdert)
    Abstract [en]

    As part of the ongoing shift in health policy, with focus on patient empowerment, the Swedish government prioritizes the patients’ access to their medical records. Different models for personal health records (PHR) are suggested.

    Studies have shown difficulties for patients when navigating and understanding the information in their records. Electronic health record systems are physician-oriented and do not include patient-oriented functions. One problem with medical records is that they contain a lot of data which is usually kept as unstructured text in narrative form; this information overload needs to be structured and presented in a manner that patients understand. Furthermore, in order for the PHR to be a supporting tool for patients, there is a need to identify which key functions should be implemented to support patients. Usage of PHR is highly dependent on the information offered and that functions available meet patient needs. In Sweden, little research has been conducted regarding PHR functions  referred by patients. This study addresses the research question “Which PHR functions are preferred by patients living in Sweden?”.

  • 2538.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University of Utah, USA.
    Mowery, Danielle L.
    Abdelrahman, Samir
    Christensen, Lee
    Chapman, Wendy W.
    BluLab: Temporal Information Extraction for the 2015 Clinical TempEval Challenge2015Inngår i: Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015), Association for Computational Linguistics, 2015, s. 815-819Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The 2015 Clinical TempEval Challenge addressed the problem of temporal reasoning in the clinical domain by providing an annotated corpus of pathology and clinical notes related to colon cancer patients. The challenge consisted of six subtasks: TIMEX3 and event span detection, TIMEX3 and event attribute classification, document relation time and narrative container relation classification. Our BluLab team participated in all six subtasks. For the TIMEX3 and event subtasks, we developed a ClearTK support vector machine pipeline using mainly simple lexical features along with information from rule-based systems. For the relation subtasks, we employed a conditional random fields classification approach, with input from a rule-based system for the narrative container relation subtask. Our team ranked first for all TIMEX3 and event subtasks, as well as for the document relation subtask.

  • 2539.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Mowery, Danielle L.
    South, Brett R.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Karolinska Institutet, Sweden.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Recent Advances in Clinical Natural Language Processing in Support of Semantic Analysis2015Inngår i: IMIA Yearbook of Medical Informatics, ISSN 0943-4747, Vol. 10, nr 1, s. 183-193Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objectives

    We present a review of recent advances in clinical Natural Language Processing (NLP), with a focus on semantic analysis and key subtasks that support such analysis.

    Methods

    We conducted a literature review of clinical NLP research from 2008 to 2014, emphasizing recent publications (2012-2014), based on PubMed and ACL proceedings as well as relevant referenced publications from the included papers.

    Results

    Significant articles published within this time-span were included and are discussed from the perspective of semantic analysis. Three key clinical NLP subtasks that enable such analysis were identified: 1) developing more efficient methods for corpus creation (annotation and de-identification), 2) generating building blocks for extracting meaning (morphological, syntactic, and semantic subtasks), and 3) leveraging NLP for clinical utility (NLP applications and infrastructure for clinical use cases). Finally, we provide a reflection upon most recent developments and potential areas of future NLP development and applications.

    Conclusions

    There has been an increase of advances within key NLP subtasks that support semantic analysis. Performance of NLP semantic analysis is, in many cases, close to that of agreement between humans. The creation and release of corpora annotated with complex semantic information models has greatly supported the development of new tools and approaches. Research on non-English languages is continuously growing. NLP methods have sometimes been successfully employed in real-world clinical tasks. However, there is still a gap between the development of advanced resources and their utilization in clinical settings. A plethora of new clinical use cases are emerging due to established health care initiatives and additional patient-generated sources through the extensive use of social media and other devices.

  • 2540.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Skeppstedt, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Karolinska Institutet, Sweden.
    Mowery, Danielle
    Chapman, Brian E.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Chapman, Wendy W.
    Cue-based assertion classification for Swedish clinical text-Developing a lexicon for pyConTextSwe2014Inngår i: Artificial Intelligence in Medicine, ISSN 0933-3657, E-ISSN 1873-2860, Vol. 61, nr 3, s. 137-144Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objective: The ability of a cue-based system to accurately assert whether a disorder is affirmed, negated, or uncertain is dependent, in part, on its cue lexicon. In this paper, we continue our study of porting an assertion system (pyConTextNLP) from English to Swedish (pyConTextSwe) by creating an optimized assertion lexicon for clinical Swedish. Methods and material: We integrated cues from four external lexicons, along with generated inflections and combinations. We used subsets of a clinical corpus in Swedish. We applied four assertion classes (definite existence, probable existence, probable negated existence and definite negated existence) and two binary classes (existence yes/no and uncertainty yes/no) to pyConTextSwe. We compared pyConTextSwe's performance with and without the added cues on a development set, and improved the lexicon further after an error analysis. On a separate evaluation set, we calculated the system's final performance. Results: Following integration steps, we added 454 cues to pyConTextSwe. The optimized lexicon developed after an error analysis resulted in statistically significant improvements on the development set (83%F-score, overall). The system's final F-scores on an evaluation set were 81% (overall). For the individual assertion classes, F-score results were 88% (definite existence), 81% (probable existence), 55% (probable negated existence), and 63% (definite negated existence). For the binary classifications existence yes/no and uncertainty yes/no, final system performance was 97%/87% and 78%/86% F-score, respectively. Conclusions: We have successfully ported pyConTextNLP to Swedish (pyConTextSwe). We have created an extensive and useful assertion lexicon for Swedish clinical text, which could form a valuable resource for similar studies, and which is publicly available.

  • 2541.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Skeppstedt, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Karolinska University Hospital.
    Mowery, Danielle
    Chapman, Brian E.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Chapman, Wendy W.
    Porting a Rule-based Assertion Classifier for Clinical Text from English to Swedish2013Inngår i: Proceedings of the 4th International Louhi Workshop on Health Document Text Mining and Information Analysis - Louhi 2013 / [ed] Hanna Suominen, NICTA, Australia's ICT Research Centre of Excellence , 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An existing rule-based assertion classier is ported from En- glish to Swedish: pyConTextSwe. Evaluation on Swedish clinical texts shows that the English lexical resources are useful, but that there are assertion cues not obtainable in existing resources. Iterative error cor- rection of cue lexicons improves results for the ported classier. Overall nal results are 82% F-score on a development set and 74% on a test set.

  • 2542.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Weegar, Rebecka
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Temporal Annotation of Swedish Intensive Care Notes2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We describe the creation of a corpus of Swedish intensive care unit (ICU) notes annotated for temporal expressions. Clinical notes from an ICU in Stockholm, Sweden were used. The HeidelTime system was adapted to develop Swedish clinical time expression (TIMEX3) resources. Overall micro-average Inter-Annotator Agreement is high (86% F1). We have created Swedish lexical resources with clinically specific time expressions that will be useful for the development of a Swedish clinical text temporal reasoning system.

  • 2543.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    de Azevedo, Razera
    Cerratto-Pargman, Teresa
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ramberg, Robert
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Plagiarism awareness, perception, and attitudes among students and teachers in Swedish higher education – a case study2010Konferansepaper (Annet vitenskapelig)
    Abstract [en]
    The objective of the empirical study presented in this paper was to investigate students’ and teachers attitudes towards the issue of plagiarism. The study was conducted at the department of Computer and Systems Sciences (DSV) at Stockholm University (SU) in Sweden in 2009. For the purpose of the investigation, we chose to make a comparison between results obtained by Uppsala University in a previously survey focused on the study of prevention of plagiarism in student work in 2005 (Henriksson, 2008). The goal with the comparison was twofold: i) to point at similarities and differences found on the issue of how plagiarism is perceived and faced by teachers and students at both universities as well as to summarize teachers’ and students’ attitudes towards plagiarism at DSV-Stockholm University and Ii) to develop a strategy to prevent plagiarism at DSV- Stockholm University. The survey which was in English and was sent by e-mail to teachers and students at the master level at DSV and was answered by 47 students and 24 teachers. Results obtained can be organized into the following topics: Awareness of plagiarism (consisting of a comparison between students and teachers); attitudes towards plagiarism(consisting of a comparison between students and teachers and European and non-European students studying at DSV); perception of plagiarism (consisting of a comparison between students and teachers and European and non-European students studying at DSV) and, comparison of results obtained by Uppsala and Stockholm University.
  • 2544.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Is there an I in We? Combining individual and collective modes of decision making2013Inngår i: Normative Multi-Agent Systems: NorMAS 2013, 2013Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Social simulation is one of the main areas for agent-based model use with norms being one of the mostly used and studied social mechanisms. The focus has been on inter-agent mechanisms through which individuals are influenced by social norms, resulting in dynamics of norms such as emergence and diffusion. What is lacking is an integration of models of collectiveness such as we-intentionality to transcend the atomistic models such as rational choice, game theory, and social choice theory. We will start with Webers Weber distinction between four types of actions resulting from instrumental, normative, emotional or affectual and traditional motivations for actions. Then we present social norms in the light of the growing literature on collective reasoning/intentionality/rationality and outline a model in which social norms are modelled based on an agent’s collective capacity. This will be connected to the Consumat agent architecture that integrates the social and individual aspects of automatic, instrumental and normative decision making.

  • 2545.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Multiagent systems research and social science theory2006Inngår i: Handbook of research on nature inspired computing for economics and management / [ed] Jean-Philippe Rennard, Hershey, Pa.: Idea Group Reference , 2006, s. 101-110Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    This chapter describes the possible relationships between multiagent systems research and social science research, more particularly sociology. It gives examples of the consequences and possibilities of these relationships and describes some of the important issues and concepts in each of these areas. It finally points out some future directions for a bidirectional relationship between the social sciences and multiagent systems research which hopefully will help researchers in both research areas as well as researchers in management and organisation theory.

  • 2546.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Norms, individualist and collectivist perspectives (on decision making)2014Konferansepaper (Annet vitenskapelig)
  • 2547.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Eladhari, Mirjam
    Gotland University, , .
    Johansson, Magnus
    Stockholm University, , .
    Constructing autonomous social characters for games2011Konferansepaper (Fagfellevurdert)
  • 2548.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Elsenbroich, Corinna
    Surrey University, , .
    Computational Social Science and the Search for Mechanisms2013Annet (Annet (populærvitenskap, debatt, mm))
  • 2549.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Elsenbroich, Corinna
    Putting the agent back together again: needs for integrating social and behavioural sciences for agent-based social simulation2012Inngår i: Report from Dagstuhl Seminar 12111: Normative Multi-Agent Systems / [ed] Giulia Andrighetto, Guido Governatori, Pablo Noriega, and Leon van der Torre, 2012, s. 46-Konferansepaper (Annet vitenskapelig)
  • 2550.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Elsenbroich, Corinna
    Fällström, Kurt
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Modelling Contextual Decision-Making in Dilemma Games2017Inngår i: Advances in Social Simulation 2015 / [ed] Wander Jager, Rineke Verbrugge, Andreas Flache, Gert de Roo, Lex Hoogduin, Charlotte Hemelrijk, Cham, Switzerland: Springer, 2017, s. 121-127Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Social dilemmas such as the Prisoner’s Dilemma and the Tragedy of the Commons have attracted widespread interest in several social sciences and humanities including economics, sociology and philosophy. Different frameworks of human decision-making produce different answers to these dilemmas. Common for most real-world analyses of the dilemmas is finding that behaviour and choices depend on the decision context. Thus an all-in-one solution such as the rational choice model is untenable. Rather, a framework for agent-based social simulation of real-world behaviour should start by recognising different modes of decisionmaking. This paper presents such a framework and an initial evaluation of its results in two cases, (1) a repeated prisoner’s dilemma tournament playing against a set of well-known base models, and (2) a Tragedy of the Commons simulation.

48495051525354 2501 - 2550 of 2816
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