Ändra sökning
Avgränsa sökresultatet
54555657585960 2801 - 2850 av 3135
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 2801.
    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 government2012Konferensbidrag (Refereegranskat)
    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.

  • 2802. van der Torre, Leon
    et al.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Normative Multiagent Systems2004Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 2803.
    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 Medicine2014Proceedings (redaktörskap) (Övrig (populärvetenskap, debatt, mm))
  • 2804.
    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 Nicaragua2010Ingår i: 16th Americas Conference on Information Systems (AMCIS 2010), AISeL , 2010Konferensbidrag (Övrigt vetenskapligt)
  • 2805.
    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 información2007Ingår i: Nexo, ISSN 1818-6742, E-ISSN 1995-9516, Nexo, Vol. 20Artikel i tidskrift (Övrigt vetenskapligt)
  • 2806.
    Vargas Chevez, Norman Antonio
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Plazaola, Leonel
    Ekstedt, Mathias
    A consolidated strategic business and IT alignment representation: A framework aggregated from literature2008Ingår i: Proceedings of the 41st Hawaii International Conference on System Sciences - 2008, 2008Konferensbidrag (Refereegranskat)
  • 2807.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Semantic Annotations in Clinical Documentation: Exploring Potentials for Future Information Retrieval2010Konferensbidrag (Övrigt vetenskapligt)
  • 2808.
    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 Context2011Ingår i: The Fourth International Symposium on Languages in Biology and Medicine, Singapore, 2011Konferensbidrag (Refereegranskat)
    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.

  • 2809.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Shades of Certainty: Annotation and Classification of Swedish Medical Records2012Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    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.

  • 2810.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Swedish Health Data - Information Access and Representation2009Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 2811.
    Velupillai, Sumithra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Temporal Expressions in Swedish Medical Text - A Pilot Study2014Ingår i: Proceedings of BioNLP 2014: Workshop on Biomedical Natural Language Processing, Stroudsburg: Association for Computational Linguistics, 2014, s. 88-92Konferensbidrag (Refereegranskat)
  • 2812.
    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 Trial2010Ingår i: Proceedings of the Workshop on Negation and Speculation in Natural Language Processing, University of Antwerpen , 2010, s. 14-22Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 2813.
    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 languages2008Ingår i: Workshop MMIES-2: Multi-source, Multilingual Information Extraction and Summarization, Held in conjunction with COLING-2008, 2008Konferensbidrag (Refereegranskat)
  • 2814.
    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 Records2008Ingår 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 , 2008Konferensbidrag (Refereegranskat)
  • 2815.
    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 trial2009Ingår i: International Journal of Medical Informatics, ISSN 1386-5056, E-ISSN 1872-8243, Vol. 78, nr 12, s. e19-e26Artikel i tidskrift (Refereegranskat)
    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.

  • 2816.
    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 Text2011Ingår i: User Centred Networked Health Care - Proceedings of MIE 2011 / [ed] Anne Moen, Stig Kjær Andersen, Jos Aarts, Petter Hurlen, 2011, s. 559-563Konferensbidrag (Refereegranskat)
    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.

  • 2817.
    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 Pairs2008Ingår i: Proceedings of the International Symposium on Using Corpora in Contrastive and Translation Studies (UCCTS), 2008Konferensbidrag (Refereegranskat)
  • 2818.
    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 analysis2015Proceedings (redaktörskap) (Refereegranskat)
  • 2819.
    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: introduction2015Ingår i: BMC Medical Informatics and Decision Making, ISSN 1472-6947, E-ISSN 1472-6947, Vol. 2, nr SI, s. 1-3Artikel i tidskrift (Refereegranskat)
  • 2820.
    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 Pairs2010Ingår i: Using Corpora in Contrastive and Translation Studies / [ed] edited by Richard Xiao, Newcastle: Cambridge Scholars Publishing , 2010Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 2821.
    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 perspectives2013Ingår i: Scandinavian Conference on Health Informatics 2013: Copenhagen, Denmark, August 20, 2013 / [ed] Gustav Bellika et al., Linköping: Linköping University Press , 2013, s. 95-95Konferensbidrag (Refereegranskat)
    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?”.

  • 2822.
    Velupillai, Sumithra
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kvist, Maria
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Fine-grained Certainty Level Annotations Used for Coarser-grained E-health Scenarios: Certainty Classication of Diagnostic Statements in Swedish Clinical Text2012Ingår i: 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, s. 450-461Konferensbidrag (Refereegranskat)
    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).

  • 2823.
    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 Challenge2015Ingår i: Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015), Association for Computational Linguistics, 2015, s. 815-819Konferensbidrag (Refereegranskat)
    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.

  • 2824.
    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 Analysis2015Ingår i: IMIA Yearbook of Medical Informatics, ISSN 0943-4747, Vol. 10, nr 1, s. 183-193Artikel i tidskrift (Refereegranskat)
    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.

  • 2825.
    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 pyConTextSwe2014Ingår i: Artificial Intelligence in Medicine, ISSN 0933-3657, E-ISSN 1873-2860, Vol. 61, nr 3, s. 137-144Artikel i tidskrift (Refereegranskat)
    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.

  • 2826.
    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 Swedish2013Ingår 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 , 2013Konferensbidrag (Refereegranskat)
    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.

  • 2827.
    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 Notes2016Konferensbidrag (Refereegranskat)
    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.

  • 2828.
    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 study2010Konferensbidrag (Övrigt vetenskapligt)
    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.
  • 2829.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Autonomy and reasoning for natural and artificial agents2004Ingår i: Agents and computational autonomy: potential, risks, and solutions / [ed] Matthias Nickles, Michael Rovatsos, Gerhard Weiss, Berlin: Springer Berlin/Heidelberg, 2004, Vol. 2969 , s. 83-94Konferensbidrag (Övrigt vetenskapligt)
  • 2830.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Is there an I in We? Combining individual and collective modes of decision making2013Ingår i: Normative Multi-Agent Systems: NorMAS 2013, 2013Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 2831.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Multiagent systems research and social science theory2006Ingår i: Handbook of research on nature inspired computing for economics and management / [ed] Jean-Philippe Rennard, Hershey, Pa.: Idea Group Reference , 2006, s. 101-110Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    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.

  • 2832.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Norms, individualist and collectivist perspectives (on decision making)2014Konferensbidrag (Övrigt vetenskapligt)
  • 2833.
    Verhagen, Harko
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Kommunikation och kognition.
    Normtypologies2007Ingår i: Normative Multi-Agent Systems 2007. Dagstuhl Seminar Proceedings 07122, 2007Konferensbidrag (Övrigt vetenskapligt)
  • 2834.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Kommunikation och kognition.
    Cerratto-Pargman, Teresa
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Kommunikation och kognition.
    Hansson, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Kommunikation och kognition.
    Näckros, Kjell
    Ramberg, Robert
    Razera de Azevedo, Diana
    Westerborn, Mats
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Data- och Systemvetenskap. Tillämpad IT. Tillämpad IT med entreprenörskap.
    Wettergren, Gunnar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Programvaruutveckling.
    Control, creativity and cheating in traditional and flexible education - Validating students knowledge in higher education in three educational setups2009Ingår i: 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., 2009Konferensbidrag (Övrigt vetenskapligt)
  • 2835.
    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 games2011Konferensbidrag (Refereegranskat)
  • 2836.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Elsenbroich, Corinna
    Surrey University, , .
    Computational Social Science and the Search for Mechanisms2013Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 2837.
    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 simulation2012Ingår 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-Konferensbidrag (Övrigt vetenskapligt)
  • 2838.
    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 Games2017Ingår 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. 121-127Kapitel i bok, del av antologi (Refereegranskat)
    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.

  • 2839.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johansson, Magnus
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Demystifying guilds: MMORPG-playing and norms2009Ingår i: Breaking New Ground: Innovation in Games, Play, Practice and Theory, 2009Konferensbidrag (Refereegranskat)
  • 2840.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johansson, Magnus
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Eladhari, Mirjam P.
    The Need for Socially Believable NPCs: Game Designers' View2012Ingår i: ECREA’s Pre-Conference: Experiencing Digital Games: Use, Effects & Culture of Gaming, 2012Konferensbidrag (Refereegranskat)
  • 2841.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johansson, Magnus
    Jager, Wander
    Games and Online Research Methods2017Ingår i: The SAGE Handbook of Online Research Methods / [ed] Nigel Fielding, Raymond M. Lee, Grant Blank, Los Angeles: Sage Publications, 2017, nr 2, s. 295-306Kapitel i bok, del av antologi (Refereegranskat)
  • 2842.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    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).2013Proceedings (redaktörskap) (Övrig (populärvetenskap, debatt, mm))
  • 2843.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Noriega, Pablo
    d’Inverno, Mark
    Towards a Design Framework for Controlled Hybrid Social Games2013Ingår i: Social Coordination: Principles, Artefacts and Theories (SOCIAL.PATH): AISB Convention 2013 / [ed] Harko Verhagen, Pablo Noriega, Tina Balke, Marina de Vos, 2013, s. 83-87Konferensbidrag (Refereegranskat)
    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.

  • 2844.
    Verhagen, Harko
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Palosaari Eladhari, Mirjam
    Johansson, Magnus
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    McCoy, Josh
    Social Believability in Games2013Ingår i: Advances in Computer Entertainment: 10th International Conference. Proceedings / [ed] Dennis Reidsma, Haruhiro Katayose, Anton Nijholt, Springer International Publishing , 2013, s. 649-652Konferensbidrag (Refereegranskat)
    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.

  • 2845.
    Vickman, Sara
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Larsson, Aron
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Olsson, Leif
    Mittuniversitetet, , Dept. of Information Technology and Media.
    Prerequisites for Decision Aid in Socially Responsible Investment Appraisals2012Ingår i: International Journal of Engineering Management and Economics (IJEME), ISSN 1756-5154, E-ISSN 1756-5162, Vol. 3, nr 4, s. 359-377Artikel i tidskrift (Refereegranskat)
    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.

  • 2846. Vilkkumaa, Eeva
    et al.
    Salo, Ahti
    Liesio, Juuso
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, UK.
    Fostering breakthrough technologies - How do optimal funding decisions depend on evaluation accuracy?2015Ingår i: Technological forecasting & social change, ISSN 0040-1625, E-ISSN 1873-5509, Vol. 96, s. 173-190Artikel i tidskrift (Refereegranskat)
    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.

  • 2847. Virasjoki, Vilma
    et al.
    Rocha, Paula
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, U.K..
    Salo, Ahti
    Market Impacts of Energy Storage in a Transmission-Constrained Power System2016Ingår i: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 31, nr 5, s. 4108-4117Artikel i tidskrift (Refereegranskat)
    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.

  • 2848. Virasjoki, Vilma
    et al.
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, U.K.; HEC Montréal, Canada.
    Zakeri, Behnam
    Salo, Ahti
    Market Power with Combined Heat and Power Production in the Nordic Energy System2018Ingår i: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The trend toward increasing energy efficiency and variable renewable energy (VRE) production has implications for combined heat and power (CHP) plants, which operate in both the price-driven power market and the district heating (DH) sector. Since CHP will be important in VRE integration, we develop a complementarity model to analyze CHP producers' roles in integrated markets. We use a Nordic case study to gain insights into (i) the effect of the link between CHP and DH on market power and (ii) market power's impact on operations in the DH sector. The results indicate that (i) the link of CHP to DH supply can increase market power and (ii) market power can induce shifts in DH production from heat-only to CHP.

  • 2849. Vitak, Jessica
    et al.
    Wisniewski, Pamela
    Page, Xinru
    Lampinen, Airi
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Litt, Eden
    De Wolf, Ralf
    Gage Kelley, Patrick
    Sleeper, Manya
    The Future of Networked Privacy: Challenges and Opportunities2015Ingår i: CSCW'15, the 18th ACM Conference Computer Supported Cooperative Work & Social Computing, ACM Press , 2015Konferensbidrag (Övrigt vetenskapligt)
  • 2850. Višković, Verena
    et al.
    Chen, Yihsu
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, United Kingdom; HEC Montréal, Canada.
    Implications of the EU Emissions Trading System for the South-East Europe Regional Electricity Market2017Ingår i: Energy Economics, ISSN 0140-9883, E-ISSN 1873-6181, Vol. 65, s. 251-261Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As part of its climate policy, the European Union (EU) aims to reduce greenhouse gas (GHG) emissions levels by 20% by the year 2020 compared to 1990 levels. Although the EU is projected to reach this goal, its achievement of objectives under its Emissions Trading System (ETS) may be delayed by carbon leakage, which is defined as a situation in which the reduction in emissions in the ETS region is partially offset by an increase in carbon emissions in the non-ETS regions. We study the interaction between emissions and hydropower availability in order to estimate the magnitude of carbon leakage in the South-East Europe Regional Electricity Market (SEE-REM) via a bottom-up partial equilibrium framework. We find that 6.3% to 40.5% of the emissions reduction achieved in the ETS part of SEE-REM could be leaked to the non-ETS part depending on the price of allowances. Somewhat surprisingly, greater hydropower availability may increase emissions in the ETS part of SEE-REM. However, carbon leakage might be limited by demand response to higher electricity prices in the non-ETS area of SEE-REM. Such carbon leakage can affect both the competitiveness of producers in ETS member countries on the periphery of the ETS and the achievement of EU targets for CO2 emissions reduction. Meanwhile, higher non-ETS electricity prices imply that the current policy can have undesirable outcomes for consumers in non-ETS countries, while non-ETS producers would experience an increase in their profits due to higher power prices as well as exports. The presence of carbon leakage in SEE-REM suggests that current EU policy might become more effective when it is expanded to cover more countries in the future.

54555657585960 2801 - 2850 av 3135
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf