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  • 2801.
    Uppström, Elin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Lönn, Carl-Mikael
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Explaining value co-creation and co-destruction in e-government using boundary object theory2017In: Government Information Quarterly, ISSN 0740-624X, E-ISSN 1872-9517, Vol. 34, no 3, p. 406-420Article in journal (Refereed)
    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.

  • 2802.
    Uppström, Elin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Lönn, Carl-Mikael
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    The Promise of a Crowd2013In: AMCIS 2013 Proceedings, Association for Information Systems, 2013Conference paper (Refereed)
    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.

  • 2803.
    Uppström, Elin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Lönn, Carl-Mikael
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Hoffsten, Madeleine
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Thorström, Joakim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    New Implications for Customization of ERP Systems2015In: 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, p. 4220-4229Conference paper (Refereed)
    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.

  • 2804.
    Uppström, Elin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Nilsson, Andreas
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Modeling IT-mediated value encounters between citizens and local government2012Conference paper (Refereed)
    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.

  • 2805. van der Torre, Leon
    et al.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Normative Multiagent Systems2004Other (Other (popular science, discussion, etc.))
  • 2806.
    Van Gemert-Pijnen, Lisette
    et al.
    University of Twente - Enschede, The Netherlands, , .
    Hettinga, MarikeWindesheim University of Applied Sciences, The Netherlands, , .Smedberg, ÅsaStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    eTELEMED 2014, The Sixth International Conference on eHealth, Telemedicine, and Social Medicine2014Conference proceedings (editor) (Other (popular science, discussion, etc.))
  • 2807.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Johannesson, Paul
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rusu, Lazar
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    A unified strategic business and IT alignment model: A study in the public universities of Nicaragua2010In: 16th Americas Conference on Information Systems (AMCIS 2010), AISeL , 2010Conference paper (Other academic)
  • 2808.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Plazaola, Leonel
    Una representación consolidada del alineamiento estratégico de los negocios y las tecnologías de la información2007In: Nexo, ISSN 1818-6742, E-ISSN 1995-9516, Nexo, Vol. 20Article in journal (Other academic)
  • 2809.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Plazaola, Leonel
    Ekstedt, Mathias
    A consolidated strategic business and IT alignment representation: A framework aggregated from literature2008In: Proceedings of the 41st Hawaii International Conference on System Sciences - 2008, 2008Conference paper (Refereed)
  • 2810.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Semantic Annotations in Clinical Documentation: Exploring Potentials for Future Information Retrieval2010Conference paper (Other academic)
  • 2811.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Automatic Classification of Factuality Levels: A Case Study on Swedish Diagnoses and the Impact of Local Context2011In: The Fourth International Symposium on Languages in Biology and Medicine, Singapore, 2011Conference paper (Refereed)
    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.

  • 2812.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Shades of Certainty: Annotation and Classification of Swedish Medical Records2012Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Access to information is fundamental in health care. This thesis presents research on Swedish medical records with the overall goal of building intelligent information access tools that can aid health personnel, researchers and other professions in their daily work, and, ultimately, improve health care in general.

    The issue of ethics and identifiable information is addressed by creating an annotated gold standard corpus and porting an existing de-identification system to Swedish from English. The aim is to move towards making textual resources available to researchers without risking exposure of patients’ confidential information. Results for the rule-based system are not encouraging, but results for the gold standard are fairly high.

    Affirmed, uncertain and negated information needs to be distinguished when building accurate information extraction tools. Annotation models are created, with the aim of building automated systems. One model distinguishes certain and uncertain sentences, and is applied on medical records from several clinical departments. In a second model, two polarities and three levels of certainty are applied on diagnostic statements from an emergency department. Overall results are promising. Differences are seen depending on clinical practice, annotation task and level of domain expertise among the annotators.

    Using annotated resources for automatic classification is studied. Encouraging overall results using local context information are obtained. The fine-grained certainty levels are used for building classifiers for real-world e-health scenarios.

    This thesis contributes two annotation models of certainty and one of identifiable information, applied on Swedish medical records. A deeper understanding of the language use linked to conveying certainty levels is gained. Three annotated resources that can be used for further research have been created, and implications for automated systems are presented.

  • 2813.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Swedish Health Data - Information Access and Representation2009Other (Other (popular science, discussion, etc.))
  • 2814.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Temporal Expressions in Swedish Medical Text - A Pilot Study2014In: Proceedings of BioNLP 2014: Workshop on Biomedical Natural Language Processing, Stroudsburg: Association for Computational Linguistics, 2014, p. 88-92Conference paper (Refereed)
  • 2815.
    Velupillai, Sumithra
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Towards A Better Understanding of Uncertainties and Speculations in Swedish Clinical Text – Analysis of an Initial Annotation Trial2010In: Proceedings of the Workshop on Negation and Speculation in Natural Language Processing, University of Antwerpen , 2010, p. 14-22Conference paper (Other academic)
    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.

  • 2816.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Automatic Construction of Domain-specific Dictionaries on Sparse Parallel Corpora in the Nordic languages2008In: Workshop MMIES-2: Multi-source, Multilingual Information Extraction and Summarization, Held in conjunction with COLING-2008, 2008Conference paper (Refereed)
  • 2817.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Duneld, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Diagnosing Diagnoses in Swedish Clinical Records2008In: 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 , 2008Conference paper (Refereed)
  • 2818.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Hassel, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    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 trial2009In: International Journal of Medical Informatics, ISSN 1386-5056, E-ISSN 1872-8243, Vol. 78, no 12, p. e19-e26Article in journal (Refereed)
    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.

  • 2819.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Factuality Levels of Diagnoses in Swedish Clinical Text2011In: User Centred Networked Health Care - Proceedings of MIE 2011 / [ed] Anne Moen, Stig Kjær Andersen, Jos Aarts, Petter Hurlen, 2011, p. 559-563Conference paper (Refereed)
    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.

  • 2820.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Duneld, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Automatic Dictionary Construction and Identification of Parallel Text Pairs2008In: Proceedings of the International Symposium on Using Corpora in Contrastive and Translation Studies (UCCTS), 2008Conference paper (Refereed)
  • 2821.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Duneld, MartinStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Henriksson, AronStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Kvist, MariaStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Skeppstedt, MariaStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Dalianis, HerculesStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Louhi 2014: Special issue on health text mining and information analysis2015Conference proceedings (editor) (Refereed)
  • 2822.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Duneld, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Henriksson, Aron
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Skeppstedt, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Louhi 2014: Special issue on health text mining and information analysis: introduction2015In: BMC Medical Informatics and Decision Making, ISSN 1472-6947, E-ISSN 1472-6947, Vol. 2, no SI, p. 1-3Article in journal (Refereed)
  • 2823.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Hassel, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Finding the Parallel: Automatic Dictionary Construction and Identification of Parallel Text Pairs2010In: Using Corpora in Contrastive and Translation Studies / [ed] edited by Richard Xiao, Newcastle: Cambridge Scholars Publishing , 2010Chapter in book (Other academic)
  • 2824.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ibrahim, Omran
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Karolinska Institute, Sweden.
    Functions for personal health records in Sweden – patient perspectives2013In: Scandinavian Conference on Health Informatics 2013: Copenhagen, Denmark, August 20, 2013 / [ed] Gustav Bellika et al., Linköping: Linköping University Press , 2013, p. 95-95Conference paper (Refereed)
    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?”.

  • 2825.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Fine-grained Certainty Level Annotations Used for Coarser-grained E-health Scenarios: Certainty Classication of Diagnostic Statements in Swedish Clinical Text2012In: Proceedings of the 13th international conference on Computational Linguistics and Intelligent Text Processing - Volume Part II / [ed] Alexander Gelbukh, Berlin/Heidelberg: Springer Berlin/Heidelberg, 2012, p. 450-461Conference paper (Refereed)
    Abstract [en]

    An important task in information access methods is distinguishingfactual information from speculative or negated information.Fine-grained certainty levels of diagnostic statements in Swedish clinicaltext are annotated in a corpus from a medical university hospital.The annotation model has two polarities (positive and negative) andthree certainty levels. However, there are many e-health scenarios wheresuch ne-grained certainty levels are not practical for information extraction.Instead, more coarse-grained groups are needed. We presentthree scenarios: adverse event surveillance, decision support alerts andautomatic summaries and collapse the ne-grained certainty level classi-cations into coarser-grained groups. We build automatic classiers foreach scenario and analyze the results quantitatively. Annotation discrepanciesare analyzed qualitatively through manual corpus analysis. Ourmain ndings are that it is feasible to use a corpus of ne-grained certaintylevel annotations to build classiers for coarser-grained real-worldscenarios: 0.89, 0.91 and 0.8 F-score (overall average).

  • 2826.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. University of Utah, USA.
    Mowery, Danielle L.
    Abdelrahman, Samir
    Christensen, Lee
    Chapman, Wendy W.
    BluLab: Temporal Information Extraction for the 2015 Clinical TempEval Challenge2015In: Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015), Association for Computational Linguistics, 2015, p. 815-819Conference paper (Refereed)
    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.

  • 2827.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Mowery, Danielle L.
    South, Brett R.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Karolinska Institutet, Sweden.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Recent Advances in Clinical Natural Language Processing in Support of Semantic Analysis2015In: IMIA Yearbook of Medical Informatics, ISSN 0943-4747, Vol. 10, no 1, p. 183-193Article in journal (Refereed)
    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.

  • 2828.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Skeppstedt, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Karolinska Institutet, Sweden.
    Mowery, Danielle
    Chapman, Brian E.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Chapman, Wendy W.
    Cue-based assertion classification for Swedish clinical text-Developing a lexicon for pyConTextSwe2014In: Artificial Intelligence in Medicine, ISSN 0933-3657, E-ISSN 1873-2860, Vol. 61, no 3, p. 137-144Article in journal (Refereed)
    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.

  • 2829.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Skeppstedt, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Karolinska University Hospital.
    Mowery, Danielle
    Chapman, Brian E.
    Dalianis, Hercules
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Chapman, Wendy W.
    Porting a Rule-based Assertion Classifier for Clinical Text from English to Swedish2013In: 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 , 2013Conference paper (Refereed)
    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.

  • 2830.
    Velupillai, Sumithra
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Weegar, Rebecka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kvist, Maria
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Temporal Annotation of Swedish Intensive Care Notes2016Conference paper (Refereed)
    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.

  • 2831.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    de Azevedo, Razera
    Cerratto-Pargman, Teresa
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ramberg, Robert
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Plagiarism awareness, perception, and attitudes among students and teachers in Swedish higher education – a case study2010Conference paper (Other academic)
    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.
  • 2832.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Autonomy and reasoning for natural and artificial agents2004In: Agents and computational autonomy: potential, risks, and solutions / [ed] Matthias Nickles, Michael Rovatsos, Gerhard Weiss, Berlin: Springer Berlin/Heidelberg, 2004, Vol. 2969 , p. 83-94Conference paper (Other academic)
  • 2833.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Is there an I in We? Combining individual and collective modes of decision making2013In: Normative Multi-Agent Systems: NorMAS 2013, 2013Conference paper (Other academic)
    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.

  • 2834.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Multiagent systems research and social science theory2006In: Handbook of research on nature inspired computing for economics and management / [ed] Jean-Philippe Rennard, Hershey, Pa.: Idea Group Reference , 2006, p. 101-110Chapter in book (Other academic)
    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.

  • 2835.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Norms, individualist and collectivist perspectives (on decision making)2014Conference paper (Other academic)
  • 2836.
    Verhagen, Harko
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Kommunikation och kognition.
    Normtypologies2007In: Normative Multi-Agent Systems 2007. Dagstuhl Seminar Proceedings 07122, 2007Conference paper (Other academic)
  • 2837.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Kommunikation och kognition.
    Cerratto-Pargman, Teresa
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Kommunikation och kognition.
    Hansson, Henrik
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Kommunikation och kognition.
    Näckros, Kjell
    Ramberg, Robert
    Razera de Azevedo, Diana
    Westerborn, Mats
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Data- och Systemvetenskap. Tillämpad IT. Tillämpad IT med entreprenörskap.
    Wettergren, Gunnar
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Programvaruutveckling.
    Control, creativity and cheating in traditional and flexible education - Validating students knowledge in higher education in three educational setups2009In: 23rd ICDE World Conference on Open Learning and Distance Education including the 2009 EADTU Annual Conference, to be held on 7-10 June 2009 in Maastricht, Netherlands., 2009Conference paper (Other academic)
  • 2838.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Eladhari, Mirjam
    Gotland University, , .
    Johansson, Magnus
    Stockholm University, , .
    Constructing autonomous social characters for games2011Conference paper (Refereed)
  • 2839.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Elsenbroich, Corinna
    Surrey University, , .
    Computational Social Science and the Search for Mechanisms2013Other (Other (popular science, discussion, etc.))
  • 2840.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Elsenbroich, Corinna
    Putting the agent back together again: needs for integrating social and behavioural sciences for agent-based social simulation2012In: Report from Dagstuhl Seminar 12111: Normative Multi-Agent Systems / [ed] Giulia Andrighetto, Guido Governatori, Pablo Noriega, and Leon van der Torre, 2012, p. 46-Conference paper (Other academic)
  • 2841.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Elsenbroich, Corinna
    Fällström, Kurt
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Modelling Contextual Decision-Making in Dilemma Games2017In: Advances in Social Simulation 2015 / [ed] Wander Jager, Rineke Verbrugge, Andreas Flache, Gert de Roo, Lex Hoogduin, Charlotte Hemelrijk, Cham, Switzerland: Springer, 2017, p. 121-127Chapter in book (Refereed)
    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.

  • 2842.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Johansson, Magnus
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Demystifying guilds: MMORPG-playing and norms2009In: Breaking New Ground: Innovation in Games, Play, Practice and Theory, 2009Conference paper (Refereed)
  • 2843.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Johansson, Magnus
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Eladhari, Mirjam P.
    The Need for Socially Believable NPCs: Game Designers' View2012In: ECREA’s Pre-Conference: Experiencing Digital Games: Use, Effects & Culture of Gaming, 2012Conference paper (Refereed)
  • 2844.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Johansson, Magnus
    Jager, Wander
    Games and Online Research Methods2017In: The SAGE Handbook of Online Research Methods / [ed] Nigel Fielding, Raymond M. Lee, Grant Blank, Los Angeles: Sage Publications, 2017, no 2, p. 295-306Chapter in book (Refereed)
  • 2845.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Noriega, PabloConsejo Superior de Investigaciones Científicas, , Institut d'Investigació en Intelligència Artificial.Balke, TinaSurrey University.De Vos, MarinaBath University .
    Social coordination: principles, artefacts and theories (SOCIAL.PATH).2013Conference proceedings (editor) (Other (popular science, discussion, etc.))
  • 2846.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Noriega, Pablo
    d’Inverno, Mark
    Towards a Design Framework for Controlled Hybrid Social Games2013In: Social Coordination: Principles, Artefacts and Theories (SOCIAL.PATH): AISB Convention 2013 / [ed] Harko Verhagen, Pablo Noriega, Tina Balke, Marina de Vos, 2013, p. 83-87Conference paper (Refereed)
    Abstract [en]

    We propose a framework for designing and deploying games where social behaviour is kept under control. This framework may also be used for designing other dynamic coordinated social spaces.

  • 2847.
    Verhagen, Harko
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Palosaari Eladhari, Mirjam
    Johansson, Magnus
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    McCoy, Josh
    Social Believability in Games2013In: Advances in Computer Entertainment: 10th International Conference. Proceedings / [ed] Dennis Reidsma, Haruhiro Katayose, Anton Nijholt, Springer International Publishing , 2013, p. 649-652Conference paper (Refereed)
    Abstract [en]

    The Social Believability in Games Workshop intends to be a point of interaction for researchers and game developers interested in different aspects of modelling, discussing, and developing believable social agents and Non-Player Characters (NPCs). This can include discussions around behaviour based on social and behavioural science theories and models, social affordances when interacting with game worlds and more. The intention is to invite participants from a multitude of disciplines in order to create a broad spectrum of approaches to the area.

  • 2848.
    Vickman, Sara
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Larsson, Aron
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Olsson, Leif
    Mittuniversitetet, , Dept. of Information Technology and Media.
    Prerequisites for Decision Aid in Socially Responsible Investment Appraisals2012In: International Journal of Engineering Management and Economics (IJEME), ISSN 1756-5154, E-ISSN 1756-5162, Vol. 3, no 4, p. 359-377Article in journal (Refereed)
    Abstract [en]

    This paper explores investment appraisals (or capital budgeting decisions) restrained by various sources of uncertainty and influenced by corporate social responsibility and socially responsible investment thinking (SRI). The study aims to provide input for further development of computer based methods for integrating semi-quantitative decision analysis modelling with other quantitative methods for investment evaluations. Of particular interest in this paper is to assess the additional aspects of investment appraisals that derive from SRI thinking together with the multiple sources of uncertainty arising in such decision problems. We assess characteristics of how managers’ try to account for corporate social responsibility, how they cope with evaluating upon objectives beyond monetary return on investment (ROI) and how they manage uncertainty and the source of the uncertainties they emphasize. The perceived need for analytical decision aid in socially responsible investment decision making is analysed and the applicability of real options is assessed relative to the managers’ conditions and concerns. We conclude that organisations are generally exposed to and also consider both aleatory and epistemic uncertainty and need to handle other aspects of investments beyond monetary ROI. There is a mix of macro and micro variables creating a diversified environment where valuation methods such as real options in combination with decision analysis modelling could help in structuring the problem and enlighten different areas and aspects, thereby providing a framework for accounting for corporate social responsibility in capital budgeting decision making.

  • 2849. Vilkkumaa, Eeva
    et al.
    Salo, Ahti
    Liesio, Juuso
    Siddiqui, Afzal
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. University College London, UK.
    Fostering breakthrough technologies - How do optimal funding decisions depend on evaluation accuracy?2015In: Technological forecasting & social change, ISSN 0040-1625, E-ISSN 1873-5509, Vol. 96, p. 173-190Article in journal (Refereed)
    Abstract [en]

    There is a growing interest in fostering breakthrough technologies that offer exceptionally high value to society. However, when starting technology projects, it is impossible to know which of them have the potential to lead to breakthroughs. Therefore, organizations have adopted funding policies in which on-going projects are subjected to interim evaluations based on which some projects may be abandoned to release resources for seizing new opportunities. In this paper, we study which funding policies are optimal when the objective is either (i) to maximize the expected value of the project portfolio, or (ii) to maximize the expected number of exceptionally excellent projects that may lead to breakthrough technologies. We show that the optimal policy for funding exceptionally excellent projects is to start a large number of projects and abandon a high proportion of them later, whereas the optimal policy for maximizing the expected value of the project portfolio is to grant long-term funding to a smaller set of projects based on initial evaluation. Furthermore, we show how the trade-off between these two objectives depends on the initial project evaluation accuracy and the rate at which this accuracy improves. Our results suggest that this trade-off is particularly significant when the initial project evaluations are very uncertain but become more accurate soon after the projects have been launched. In such a setting, policies that seek to maximize the expected portfolio value may fail to promote breakthrough technologies.

  • 2850. Virasjoki, Vilma
    et al.
    Rocha, Paula
    Siddiqui, Afzal S.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. University College London, U.K..
    Salo, Ahti
    Market Impacts of Energy Storage in a Transmission-Constrained Power System2016In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 31, no 5, p. 4108-4117Article in journal (Refereed)
    Abstract [en]

    Environmental concerns have motivated governments in the European Union and elsewhere to set ambitious targets for generation from renewable energy (RE) technologies and to offer subsidies for their adoption along with priority grid access. However, because RE technologies like solar and wind power are intermittent, their penetration places greater strain on existing conventional power plants that need to ramp up more often. In turn, energy storage technologies, e.g., pumped hydro storage or compressed air storage, are proposed to offset the intermittency of RE technologies and to facilitate their integration into the grid. We assess the economic and environmental consequences of storage via a complementarity model of a stylized Western European power system with market power, representation of the transmission grid, and uncertainty in RE output. Although storage helps to reduce congestion and ramping costs, it may actually increase greenhouse gas emissions from conventional power plants in a perfectly competitive setting. Conversely, strategic use of storage by producers renders it less effective at curbing both congestion and ramping costs, while having no net overall impact on emissions.

54555657585960 2801 - 2850 of 3139
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