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  • 1.
    Absillis, Eline
    KTH, Skolan för datavetenskap och kommunikation (CSC).
    How Can Event Companies Use Facebook’s Ad Manager to Optimise the Click-Through-Rates of their Native Instagram Ads?2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Marketers have come to realise that an abundance of potential customers can be reached through Facebook advertising. Although a new player, Instagram is quickly catching up to Facebook’s success with its native ads. Despite this, there is a scarcity in the amount of academic literature that explores the use of them. This thesis aims to rectify that, by contributing to the academic discourse surrounding Instagram ads.

    Shownight, a live event promotion company, had yet to run ads on Instagram. Using split-testing, this thesis was aimed to figure out which ad features generated the highest click-through-rates. The tests were carried out through Facebook’s ad manager. Although a unique platform, functioning with both drawbacks and benefits, it provided this study with an efficient tool to split-test ads.

    The results from this study demonstrated Instagram to be a suitable platform on which to advertise live events. Furthermore, the findings revealed targeting through lookalikes as well as behaviour, results in the highest click-through-rate. Moreover, using a video with 4 hashtags for lookalikes targeting, and an image with up to 3 hashtags for behaviour targeting, were the best ad set combinations. A call-to-action, portraying some degree of urgency, should also be employed within the caption.

    Nevertheless, this study has its limitations. Including being restricted demographically, as well as being confined to Shownight’s target audience, and advertising content. Furthermore, Facebook’s ad manager poses its own limitations as a split-testing platform, in terms of even audience distribution. 

  • 2.
    Ahlgren, Per
    University College of Borås.
    A note on search formulation redundancy1998Inngår i: Journal of Documentation, ISSN 0022-0418, E-ISSN 1758-7379, Vol. 54, nr 3, s. 352-354Artikkel i tidsskrift (Fagfellevurdert)
  • 3.
    Ahlgren, Per
    Stockholm University, Sweden.
    Den norska modellen sett från Sverige2008Inngår i: Forskningspolitikk, ISSN 0333-0273, Vol. 31, nr 1, s. 18-18Artikkel i tidsskrift (Annet vitenskapelig)
  • 4.
    Ahlgren, Per
    University College of Borås.
    On a cognitive search strategy1999Inngår i: Digital libraries: interdisciplinary concepts, challenges and opportunities, 1999, Vol. 1, s. 245-253Konferansepaper (Fagfellevurdert)
  • 5.
    Ahlgren, Per
    University College of Borås.
    Passage retrieval: en introduktion till ett aktuellt forskningsområde2000Inngår i: Svensk biblioteksforskning, ISSN 0284-4354, E-ISSN 1653-5235, nr 2, s. 5-20Artikkel i tidsskrift (Annet vitenskapelig)
  • 6.
    Ahlgren, Per
    University College of Borås.
    Query expansion2001Inngår i: Human IT, ISSN 1402-1501, E-ISSN 1402-151X, nr 4, s. 157-176Artikkel i tidsskrift (Annet vitenskapelig)
  • 7.
    Ahlgren, Per
    University College of Borås.
    The effects of indexing strategy-query term combination on retrieval effectiveness in a Swedish full text database2004Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    This thesis deals with Swedish full text retrieval and the problem of morphological variation of query terms in thedocument database. The study is an information retrieval experiment with a test collection. While no Swedish testcollection was available, such a collection was constructed. It consists of a document database containing 161,336news articles, and 52 topics with four-graded (0, 1, 2, 3) relevance assessments.

    The effects of indexing strategy-query term combination on retrieval effectiveness were studied. Three of five testedmethods involved indexing strategies that used conflation, in the form of normalization. Further, two of these threecombinations used indexing strategies that employed compound splitting. Normalization and compound splittingwere performed by SWETWOL, a morphological analyzer for the Swedish language. A fourth combinationattempted to group related terms by right hand truncation of query terms. A search expert performed the truncation.The four combinations were compared to each other and to a baseline combination, where no attempt was made tocounteract the problem of morphological variation of query terms in the document database.

    Two situations were examined in the evaluation: the binary relevance situation and the multiple degree relevancesituation. With regard to the binary relevance situation, where the three (positive) relevance degrees (1, 2, 3) weremerged into one, and where precision was used as evaluation measure, the four alternative combinationsoutperformed the baseline. The best performing combination was the combination that used truncation. Thiscombination performed better than or equal to a median precision value for 41 of the 52 topics. One reason for therelatively good performance of the truncation combination was the capacity of its queries to retrieve different partsof speech.

    In the multiple degree relevance situation, where the three (positive) relevance degrees were retained, retrievaleffectiveness was taken to be the accumulated gain the user receives by examining the retrieval result up to givenpositions. The evaluation measure used was nDCG (normalized cumulated gain with discount). This measurecredits retrieval methods that (1) rank highly relevant documents higher than less relevant ones, and (2) rankrelevant (of any degree) documents high. With respect to (2), nDCG involves a discount component: a discount withregard to the relevance score of a relevant (of any degree) document is performed, and this discount is greater andgreater, the higher position the document has in the ranked list of retrieved documents.

    In the multiple degree relevance situation, the five combinations were evaluated under four different user scenarios,where each scenario simulated a certain user type. Again, the four alternative combinations outperformed thebaseline, for each user scenario. The truncation combination had the best performance under each user scenario.This outcome agreed with the performance result in the binary relevance situation. However, there were alsodifferences between the two relevance situations. For 25 percent of the topics and with regard to one of the four userscenarios, the set of best performing combinations in the binary relevance situation was disjunct from the set of bestperforming combinations in the multiple degree relevance situation. The user scenario in question was such thatalmost all importance was placed on highly relevant documents, and the discount was sharp.

    The main conclusion of the thesis is that normalization and right hand truncation (performed by a search expert)enhanced retrieval effectiveness in comparison to the baseline, irrespective of which of the two relevance situationswe consider. Further, the three indexing strategy-query term combinations based on normalization were almost asgood as the combination that involves truncation. This holds for both relevance situations.

  • 8.
    Ahlgren, Per
    Stockholm University.
    The SNIP indicator in relation to the Norwegian model2014Inngår i: Proceedings of the 19th International Conference on Science and Technology Indicators, 2014, s. 6-13Konferansepaper (Fagfellevurdert)
  • 9.
    Ahlgren, Per
    Stockholm University.
    Two elements of evaluative bibliometrics in Sweden: The national indicator and the bibliometric unit of Stockholm University2015Inngår i: Ronald Rousseau and the development of Scientomerics in China.: The 8th International Conference on Scientometrics and  University Evaluation, 2015, s. 66-75Konferansepaper (Annet vitenskapelig)
  • 10.
    Ahlgren, Per
    et al.
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE).
    Colliander, C.
    Sjögårde, Peter
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE). Department of ALM, Uppsala University, Uppsala, Sweden.
    Exploring the relation between referencing practices and citation impact: A large-scale study based on Web of Science data2018Inngår i: Journal of the Association for Information Science and Technology, ISSN 2330-1635, E-ISSN 2330-1643, Vol. 69, nr 5, s. 728-743Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this large-scale contribution, we deal with the relationship between properties of cited references of Web of Science articles and the field normalized citation rate of these articles. Using nearly 1 million articles, and three classification systems with different levels of granularity, we study the effects of number of cited references, share of references covered by Web of Science, mean age of references and mean citation rate of references on field normalized citation rate. To expose the relationship between the predictor variables and the response variable, we use quantile regression. We found that a higher number of references, a higher share of references to publications within Web of Science and references to more recent publications correlate with citation impact. A correlation was observed even when normalization was done with a finely grained classification system. The predictor variables affected citation impact to a larger extent at higher quantile levels. Regarding the relative importance of the predictor variables, citation impact of the cited references was in general the least important variable. Number of cited references carried most of the importance for both low and medium quantile levels, but this importance was lessened at the highest considered level.

  • 11.
    Ahlgren, Per
    et al.
    Stockholm University.
    Colliander, Cristian
    Document-document similarity approaches and science mapping: Experimental comparison of five approaches2009Inngår i: Journal of Informetrics, ISSN 1751-1577, E-ISSN 1875-5879, Vol. 3, nr 1, s. 49-63Artikkel i tidsskrift (Fagfellevurdert)
  • 12.
    Ahlgren, Per
    et al.
    Stockholm University.
    Colliander, Cristian
    Textual content, cited references, similarity order, and clustering: An experimental study in the context of science mapping2009Inngår i: Proceedings of the 12th International Conference on Scientometrics and Informetrics (Volume 2), 2009, s. 862-873Konferansepaper (Fagfellevurdert)
  • 13.
    Ahlgren, Per
    et al.
    Stockholm University, Sweden.
    Colliander, Cristian
    Persson, Olle
    Field normalized citation rates, field normalized journal impact and Norwegian weights for allocation of university research funds2012Inngår i: Scientometrics, ISSN 0138-9130, E-ISSN 1588-2861, Vol. 92, nr 3, s. 767-780Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We compared three different bibliometric evaluation approaches: two citation-based approaches and one based on manual classification of publishing channels into quality levels. Publication data for two universities was used, and we worked with two levels of analysis: article and department. For the article level, we investigated the predictive power of field normalized citation rates and field normalized journal impact with respect to journal level. The results for the article level show that evaluation of journals based on citation impact correlate rather well with manual classification of journals into quality levels. However, the prediction from field normalized citation rates to journal level was only marginally better than random guessing. At the department level, we studied three different indicators in the context of research fund allocation within universities and the extent to which the three indicators produce different distributions of research funds. It turned out that the three distributions of relative indicator values were very similar, which in turn yields that the corresponding distributions of hypothetical research funds would be very similar.

  • 14.
    Ahlgren, Per
    et al.
    Stockholm University.
    Grönqvist, Leif
    Evaluation of retrieval effectiveness with incomplete relevance data: theoretical and experimental comparison of three measures2008Inngår i: Information Processing & Management, ISSN 0306-4573, E-ISSN 1873-5371, Vol. 44, nr 1, s. 212-225Artikkel i tidsskrift (Fagfellevurdert)
  • 15.
    Ahlgren, Per
    et al.
    University College of Borås.
    Grönqvist, Leif
    Measuring retrieval effectiveness with incomplete relevance data2006Inngår i: Current research in information sciences and technologies: multidisciplinary approaches to global information systems, 2006, s. 74-78Konferansepaper (Fagfellevurdert)
  • 16.
    Ahlgren, Per
    et al.
    University College of Borås.
    Grönqvist, Leif
    Retrieval evaluation with incomplete relevance data: a comparative study of three measures2006Inngår i: Proceedings of the 15th ACM International Conference on Information and Knowledge Management, 2006, s. 872-873Konferansepaper (Fagfellevurdert)
  • 17.
    Ahlgren, Per
    et al.
    Stockholm University.
    Hinders, Johan
    Lindelöw, Camilla
    Parmhed, Sara
    Swedberg, Per
    Research collaboration between Stockholm University and other Swedish academic institutions: a bibliometric study to support decisions on library collaboration2015Inngår i: Qualitative and Quantitative Methods in Libraries (QQML), ISSN 2241-1925, Vol. 4, s. 49-60Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Academic libraries collaborate in several ways. For instance, collaboration can concern standards for indexing and statistics, technical solutions or collection development. A question that a given academic library might ask is with which other academic libraries the library should principally collaborate. In this study, we show how bibliometric methods can be used to generate information that can support decision making with regard to the question at stake. We evaluate the amount of research collaboration between Stockholm University and other Swedish academic institutions across five publishing years, and for the whole considered time period, where research collaboration is operationalized as co-publishing. A dataset of publications obtained from Web of Science, where each publication has at least one Stockholm University address, is used in the study. Co-publishing rates, non-fractionalized and fractionalized, across the publishing years and for the whole for period, for Stockholm University and other Swedish academic institutions, are reported. Further, parts of the outcome of the study are visualized in terms of co-publishing networks.

  • 18.
    Ahlgren, Per
    et al.
    Stockholm University.
    Jarneving, Bo
    Bibliographic coupling, common abstract stems and clustering: a comparison of two document-document similarity approaches in the context of science mapping2008Inngår i: Scientometrics, ISSN 0138-9130, E-ISSN 1588-2861, Vol. 76, nr 2, s. 273-290Artikkel i tidsskrift (Fagfellevurdert)
  • 19.
    Ahlgren, Per
    et al.
    University College of Borås.
    Jarneving, Bo
    Rousseau, Ronald
    Author cocitation analysis and Pearson's r2004Inngår i: Journal of The American Society For Information Science And Technology, ISSN 1532-2882, E-ISSN 1532-2890, Vol. 55, nr 9, s. 843-843Artikkel i tidsskrift (Fagfellevurdert)
  • 20.
    Ahlgren, Per
    et al.
    University College of Borås.
    Jarneving, Bo
    Rousseau, Ronald
    Rejoinder: In defense of formal methods2004Inngår i: Journal of The American Society For Information Science And Technology, ISSN 1532-2882, E-ISSN 1532-2890, Vol. 55, nr 10, s. 936-936Artikkel i tidsskrift (Fagfellevurdert)
  • 21.
    Ahlgren, Per
    et al.
    University College of Borås.
    Jarneving, Bo
    Rousseau, Ronald
    Requirements for a cocitation similarity measure, with special reference to Pearson's correlation coefficient2003Inngår i: Journal of The American Society For Information Science And Technology, ISSN 1532-2882, E-ISSN 1532-2890, Vol. 54, nr 6, s. 550-560Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Author cocitation analysis (ACA), a special type of cocitation analysis, was introduced by White and Griffith in 1981. This technique is used to analyze the intellectual structure of a given scientific field. In 1990, McCain published a technical overview that has been largely adopted as a standard. Here, McCain notes that Pearson's correlation coefficient (Pearson's r) is often used as a similarity measure in ACA and presents some advantages of its use. The present article criticizes the use of Pearson's r in ACA and sets forth two natural requirements that a similarity measure applied in ACA should satisfy. It is shown that Pearson's r does not satisfy these requirements. Real and hypothetical data are used in order to obtain counterexamples to both requirements. It is concluded that Pearson's r is probably not an optimal choice of a similarity measure in ACA. Still, further empirical research is needed to show if, and in that case to what extent, the use of similarity measures in ACA that fulfill these requirements would lead to objectively better results in full-scale studies. Further, problems related to incomplete cocitation matrices are discussed.

  • 22.
    Ahlgren, Per
    et al.
    Stockholm University, Sweden.
    Järvelin, Kalervo
    Measuring impact of twelve information scientists using the DCI index2010Inngår i: Journal of The American Society For Information Science And Technology, ISSN 1532-2882, E-ISSN 1532-2890, Vol. 61, nr 7, s. 1424-1439Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Discounted Cumulated Impact (DCI) index has recently been proposed for research evaluation. In the present work an earlier dataset by Cronin and Meho (2007) is reanalyzed, with the aim of exemplifying the salient features of the DCI index. We apply the index on, and compare our results to, the outcomes of the Cronin-Meho (2007) study. Both authors and their top publications are used as units of analysis, which suggests that, by adjusting the parameters of evaluation according to the needs of research evaluation, the DCI index delivers data on an author's (or publication's) "lifetime" impact or current impact at the time of evaluation on an author's (or publication's) capability of inviting citations from highly cited later publications as an indication of impact, and on the relative impact across a set of authors (or publications) over their "lifetime" or currently.

  • 23.
    Ahlgren, Per
    et al.
    University College of Borås.
    Kekälainen, Jaana
    Indexing strategies for Swedish full text retrieval under different user scenarios2007Inngår i: Information Processing & Management, ISSN 0306-4573, E-ISSN 1873-5371, Vol. 43, nr 1, s. 81-102Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper deals with Swedish full text retrieval and the problem of morphological variation of query terms in the document database. The effects of combination of indexing strategies with query terms on retrieval effectiveness were studied. Three of five tested combinations involved indexing strategies that used conflation, in the form of normalization. Further, two of these three combinations used indexing strategies that employed compound splitting. Normalization and compound splitting were performed by SWETWOL, a morphological analyzer for the Swedish language. A fourth combination attempted to group related terms by right hand truncation of query terms. The four combinations were compared to each other and to a baseline combination, where no attempt was made to counteract the problem of morphological variation of query terms in the document database. The five combinations were evaluated under six different user scenarios, where each scenario simulated a certain user type. The four alternative combinations outperformed the baseline, for each user scenario. The truncation combination had the best performance under each user scenario. The main conclusion of the paper is that normalization and right hand truncation (performed by a search expert) enhanced retrieval effectiveness in comparison to the baseline. The performance of the three combinations of indexing strategies with query terms based on normalization was not far below the performance of the truncation combination. (c) 2006 Elsevier Ltd. All rights reserved.

  • 24.
    Ahlgren, Per
    et al.
    University College of Borås.
    Kekälainen, Jaana
    Swedish full text retrieval: Effectiveness of different combinations of indexing strategies with query terms2006Inngår i: Information retrieval (Boston), ISSN 1386-4564, E-ISSN 1573-7659, Vol. 9, nr 6, s. 681-697Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, which treats Swedish full text retrieval, the problem of morphological variation of query terms in the document database is studied. The Swedish CLEF 2003 test collection was used, and the effects of combination of indexing strategies with query terms on retrieval effectiveness were studied. Four of the seven tested combinations involved indexing strategies that used normalization, a form of conflation. All of these four combinations employed compound splitting, both during indexing and at query phase. SWETWOL, a morphological analyzer for the Swedish language, was used for normalization and compound splitting. A fifth combination used stemming, while a sixth attempted to group related terms by right hand truncation of query terms. The truncation was performed by a search expert. These six combinations were compared to each other and to a baseline combination, where no attempt was made to counteract the problem of morphological variation of query terms in the document database. Both the truncation combination, the four combinations based on normalization and the stemming combination outperformed the baseline. Truncation had the best performance. The main conclusion of the paper is that truncation, normalization and stemming enhanced retrieval effectiveness in comparison to the baseline. Further, normalization and stemming were not far below truncation.

  • 25.
    Ahlgren, Per
    et al.
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Avdelningen för bibliotek, språk och ARC, Publiceringens infrastruktur.
    Pagin, Peter
    Persson, Olle
    Svedberg, Maria
    Bibliometric analysis of two subdomains in philosophy: free will and sorites2015Inngår i: SCIENTOMETRICS, ISSN 0138-9130, Vol. 103, nr 1, s. 47-73Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study we tested the fruitfulness of advanced bibliometric methods for mapping subdomains in philosophy. The development of the number of publications on free will and sorites, the two subdomains treated in the study, over time was studied. We applied the cocitation approach to map the most cited publications, authors and journals, and we mapped frequently occurring terms, using a term co-occurrence approach. Both subdomains show a strong increase of publications in Web of Science. When we decomposed the publications by faculty, we could see an increase of free will publications also in social sciences, medicine and natural sciences. The multidisciplinary character of free will research was reflected in the cocitation analysis and in the term co-occurrence analysis: we found clusters/groups of cocited publications, authors and journals, and of co-occurring terms, representing philosophy as well as non-philosophical fields, such as neuroscience and physics. The corresponding analyses of sorites publications displayed a structure consisting of research themes rather than fields. All in all, both philosophers involved in this study acknowledge the validity of the various networks presented. Bibliometric mapping appears to provide an interesting tool for describing the cognitive orientation of a research field, not only in the natural and life sciences but also in philosophy, which this study shows.

  • 26.
    Ahlgren, Per
    et al.
    Stockholm University.
    Persson, Olle
    Globalization of citations and collaboration: A study of twelve journals2012Inngår i: Proceedings of the 17th International Conference on Science and Technology Indicators, 2012, Vol. 1, s. 23-32Konferansepaper (Fagfellevurdert)
  • 27.
    Ahlgren, Per
    et al.
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Avdelningen för bibliotek, språk och ARC, Publiceringens infrastruktur.
    Persson, Olle
    Rousseau, Ronald
    An approach for efficient online identification of the top-k percent most cited documents in large sets of Web of Science documents2014Inngår i: ISSI Newsletter, ISSN 1998-5460, Vol. 10, nr 4, s. 81-89Artikkel i tidsskrift (Annet vitenskapelig)
  • 28.
    Ahlgren, Per
    et al.
    Stockholm University.
    Persson, Olle
    Tijssen, Robert
    Geographical distance in bibliometric relations within epistemic communities2013Inngår i: Scientometrics, ISSN 0138-9130, E-ISSN 1588-2861, Vol. 95, nr 2, s. 771-784Artikkel i tidsskrift (Fagfellevurdert)
  • 29.
    Ahlgren, Per
    et al.
    Stockholm University.
    Waltman, Ludo
    The correlation between citation-based and expert-based assessments of publication channels: SNIP and SJR vs. Norwegian quality assessments2014Inngår i: Journal of Informetrics, ISSN 1751-1577, E-ISSN 1875-5879, Vol. 8, nr 4, s. 985-996Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the correlation between citation-based and expert-based assessments of journals and series, which we collectively refer to as sources. The source normalized impact per paper (SNIP), the Scimago Journal Rank 2 (SJR2) and the raw impact per paper (RIP) indicators are used to assess sources based on their citations, while the Norwegian model is used to obtain expert-based source assessments. We first analyze – within different subject area categories and across such categories – the degree to which RIP, SNIP and SJR2 values correlate with the quality levels in the Norwegian model. We find that sources at higher quality levels on average have substantially higher RIP, SNIP, and SJR2 values. Regarding subject area categories, SNIP seems to perform substantially better than SJR2 from the field normalization point of view. We then compare the ability of RIP, SNIP and SJR2 to predict whether a source is classified at the highest quality level in the Norwegian model or not. SNIP and SJR2 turn out to give more accurate predictions than RIP, which provides evidence that normalizing for differences in citation practices between scientific fields indeed improves the accuracy of citation indicators.

  • 30.
    Ahlgren, Per
    et al.
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Avdelningen för bibliotek, språk och ARC, Bibliotek, Publiceringens infrastruktur.
    Yue, Ting
    Rousseau, Ronald
    Yang, Liying
    The role of the Chinese Key Labs in the international and national scientific arena revisited2017Inngår i: Research Evaluation, ISSN 0958-2029, E-ISSN 1471-5449, Vol. 26, nr 2, s. 132-143Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this contribution, which builds on and develops a study that was published more than 10 years ago, we address the role of the Chinese Key Labs (KLs) in the international and national scientific arena. We give a short overview of the position of KLs in China, including their budget and manpower. Based on large numbers of Chinese publications obtained from the Web of Science (WoS) and the Chinese Science Citation Database (CSCD), the KLs are compared across publication years to the rest of China (ChRest) with respect to publication output and citation impact. We also look at collaboration in terms of co-publishing between the KLs and the ChRest. As to publications in the WoS, we found that the contribution of KLs compared with the ChRest is slightly and irregularly increasing (using full counting as well as fractional counting), whereas a stronger increasing trend is observed for the corresponding contribution in the CSCD. We observed an increase in the number of collaborations between KLs and Chinese colleagues, regardless of database. For WoS and field normalized citation indicators, we obtained the expected results that researchers at KLs perform considerably better than other Chinese colleagues and, moreover, perform clearly better than database average. As such we may conclude that KLs have lived up to their promise and made real impact on the international arena.

  • 31.
    Ahluwalia, A.
    et al.
    Italy.
    De Maria, C.
    Italy.
    Lantada, A. D.
    Spain.
    Pietro, L. D.
    Italy.
    Ravizza, A.
    Italy.
    Mridha, Mannan
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Medicinteknik och hälsosystem, Hälsoinformatik och logistik.
    Madete, J.
    Kenya.
    Makobore, P. N.
    Uganda.
    Aabloo, A.
    Estonia.
    Kitsing, R.
    Estonia.
    Leivobits, A.
    Estonia.
    Towards open source medical devices current situation, inspiring advances and challenges2018Inngår i: BIODEVICES 2018 - 11th International Conference on Biomedical Electronics and Devices, Proceedings; Part of 11th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2018, SciTePress, 2018, s. 141-149Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Open Source Medical Devices may be part of the solution towards the democratization of medical technologies pursuing Universal Health Coverage as part of the Sustainable Development Goals for United Nations. Recent technological advances, especially in information and communication technologies, combined with innovative collaborative design methodologies and manufacturing techniques allow for the mass-personalization of biodevices and help to optimize the related development times and costs, while keeping safety in the foreground through the whole life cycle of medical products. These advantages can be further promoted by adequately fostering collaboration, communication, high value information exchange, and sustainable partnerships and by extending the employment of open source strategies. To this end, within the UBORA project, we are developing a framework for training the biomedical engineers of the future in open-source collaborative design strategies and for supporting the sharing of information and the assessment of safety and efficacy in novel biodevices. An essential part of this open-source collaborative framework is the UBORA e-infrastructure, which is presented in this study, together with some initial success cases. Main future challenges, connected with regulatory harmonization, with educational issues and with accessible and open design and manufacturing resources, among others, are also presented and discussed.

  • 32.
    Ahmadi Achachlouei, Mohammad
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Miljöstrategisk analys (fms). KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC.
    Hilty, Lorenz M.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC.
    Modeling the Effects of ICT on Environmental Sustainability: Revisiting a System Dynamics Model Developed for the European Commission2015Inngår i: ICT Innovations for Sustainability / [ed] Hilty, L.M.; Aebischer, B., Switzerland: Springer Publishing Company, 2015, s. 449-474Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    This chapter revisits a System Dynamics model developed in 2002 with the aim of exploring the future impacts of Information and Communication Technology (ICT) on environmental sustainability in the EU, which then consisted of 15 countries. The time horizon of the study was 20 years (2000–2020). We analyze the results in light of empirical data that is now available for 2000–2012. None of the three scenarios that were developed by experts to specify the external factors needed to run the model were realistic from today’s point of view. If the model is re-run with more realistic input data for the first half of the simulation period, however, the main results regarding the impact of ICT remain qualitatively the same; they seem to be relatively robust implications of the causal system structure, as it is represented in the model. Overall, the impacts of ICT for mitigating greenhouse gas emissions and other environmental burdens for 2020 tend to be slightly stronger if the simulation is based on the empirical data now available.

  • 33.
    Ahmadi Achachlouei, Mohammad
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Miljöstrategisk analys (fms). Skolan för datavetenskap och kommunikation (CSC), Centra, KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC.
    Hilty, Lorenz M.
    Skolan för datavetenskap och kommunikation (CSC), Centra, KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC. Empa, Swiss Federal Laboratories for Materials Science and Technology. Department of Informatics, University of Zurich.
    Modelling Rebound Effects in System Dynamics2014Inngår i: Proceedings of the 28th Conference on Environmental Informatics - EnviroInfo 2014 - ICT for Energy Efficiency / [ed] Marx Gómez, J., Sonnenschein, M., Vogel, U., Winter, A., Rapp, B., Giesen, N., Germany: BIS Oldenburg, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The induction of demand by increasing the efficiency of a production or consumption process is known as the rebound effect. Feedback loops in System Dynamics can be used to conceptualize the structure of this complex phenomenon and also for communicating model-based insights. In passenger transport, the rebound effect can be induced through increased cost efficiency (direct economic rebound) and/or increase in speed (time rebound). In this paper we review and compare two models on environmental effects of passenger transport—including a model on the role of information and communication technology. We highlight the feedback mechanisms used to deal with the rebound effect (price, efficiency, and time rebound).

  • 34.
    Ahmadi Achachlouei, Mohammad
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC. Department of Informatics, University of Zurich, Zurich, Switzerland.
    Hilty, Lorenz M
    KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Skolan för arkitektur och samhällsbyggnad (ABE), Centra, Centre for Sustainable Communications, CESC. Department of Informatics, University of Zurich, Zurich, Switzerland.
    Simulating the future impact of ICT on environmental sustainability: validating and recalibrating a system dynamics model - Background Data2014Rapport (Annet vitenskapelig)
    Abstract [en]

    This report serves as supplementary material to the book chapter “Modeling the Effects of ICT on Environmental Sustainability: Revisiting a System Dynamics Model Developed for the European Commission” (Achachlouei and Hilty 2015) published in the book “ICT Innovations for Sustainability” (Hilty and Aebischer 2015). The current report was referred to in the book chapter whenever the data to be presented exceeded the space provided for the book chapter.

  • 35. Ahmed, A. A.
    et al.
    Almeida, Teresa
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Medieteknik och interaktionsdesign, MID.
    Choi, J. O.
    Pincus, J.
    Ireland, K.
    What’s at issue: Sex, stigma, and politics in ACM publishing2018Inngår i: Proceeding CHI EA '18 Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems, Association for Computing Machinery (ACM), 2018, artikkel-id alt07Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Because publishing with the ACM is essentially required to advance our careers, we must examine its practices critically and constructively. To this end, we reflect on our experience working with the ACM student publication Crossroads. We encountered rigid content limitations related to sex and sexuality, preventing some contributors from foregrounding their connection to political activism, and others from publishing altogether. We explore the underlying institutional and sociopolitical problems and propose starting points for future action, including developing a transparent content approval policy and new organizations for politically-engaged computing researchers, all of which should center the leadership of marginalized individuals.

  • 36.
    Akius, Kim
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Approaching micrometer size graphene flakes on an insulating substrate with STM2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In this study, a method for landing with a Scanning Tunneling Microscope (STM) on a µm size ake of graphene was developed. Two approaches were explored, one using physical guides to navigate on the sample and another one using capacitive pickup in the system. We show that with no modication of the STM that was used, we could land on a micrometer size ake of graphene.

  • 37.
    Al Moubayed, Samer
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH, Tal-kommunikation. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    Beskow, Jonas
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH, Tal-kommunikation. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    Öster, Ann-Marie
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH, Tal-kommunikation. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    Salvi, Giampiero
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH, Tal-kommunikation. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    Granström, Björn
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH, Tal-kommunikation. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    van Son, Nic
    Ormel, Ellen
    Virtual Speech Reading Support for Hard of Hearing in a Domestic Multi-Media Setting2009Inngår i: INTERSPEECH 2009: 10TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION 2009, BAIXAS: ISCA-INST SPEECH COMMUNICATION ASSOC , 2009, s. 1443-1446Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we present recent results on the development of the SynFace lip synchronized talking head towards multilinguality, varying signal conditions and noise robustness in the Hearing at Home project. We then describe the large scale hearing impaired user studies carried out for three languages. The user tests focus on measuring the gain in Speech Reception Threshold in Noise when using SynFace, and on measuring the effort scaling when using SynFace by hearing impaired people. Preliminary analysis of the results does not show significant gain in SRT or in effort scaling. But looking at inter-subject variability, it is clear that many subjects benefit from SynFace especially with speech with stereo babble noise.

  • 38. Allwood, Jens
    et al.
    Cerrato, Loredana
    KTH, Skolan för datavetenskap och kommunikation (CSC), Tal, musik och hörsel, TMH. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Talteknologi, CTT.
    Jokinen, Kristiina
    Navarretta, Costanza
    Paggio, Patrizia
    The MUMIN coding scheme for the annotation of feedback, turn management and sequencing phenomena2007Inngår i: Language resources and evaluation, ISSN 1574-020X, E-ISSN 1574-0218, Vol. 41, nr 3-4, s. 273-287Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper deals with a multimodal annotation scheme dedicated to the study of gestures in interpersonal communication, with particular regard to the role played by multimodal expressions for feedback, turn management and sequencing. The scheme has been developed under the framework of the MUMIN network and tested on the analysis of multimodal behaviour in short video clips in Swedish, Finnish and Danish. The preliminary results obtained in these studies show that the reliability of the categories defined in the scheme is acceptable, and that the scheme as a whole constitutes a versatile analysis tool for the study of multimodal communication behaviour.

  • 39.
    Andersson, Mats
    KTH, Skolan för datavetenskap och kommunikation (CSC), Numerisk Analys och Datalogi, NADA.
    Frekventa användares bruk och uppfattning av webben2005Inngår i: Human IT, ISSN 1402-1501, E-ISSN 1402-151X, Vol. 8, nr 1, s. 1-49Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Web is becoming an essential appliance for people in contemporary society. But although the Web is easy to define in technical terms, it is much harder to describe in terms of aims and what it can afford. This paper presents a study on frequent users' usage and experiences of the Web and is based on a social constructive perspective. Notes from diaries were used in so-called stimulated recall interviews. The study was conducted with inspiration from phenomenography and resulted in the identification of four aspects of what the Web can afford: the aspect of reference; the aspect of distance eliminator; the aspect of overview; and the social aspect. The results also give a picture of usage in everyday life. The respondents' knowledge of how to use the Web is diverse, which implies that such knowledge should not be neglected or taken for granted. Another conclusion is that a technologically deterministic view of Web usage can be questioned.

  • 40.
    Andersson, Mats
    KTH, Tidigare Institutioner                               , Data- och systemvetenskap, DSV.
    Person Plus Web: Samples From Everyday Life2003Inngår i: Proceedings of World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education 2003, 2003, s. 1479-1482Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In everyday life it is often the result of knowledge that counts, not the actual knowledge itself. There are a lot of theories of how artefacts in one way or another can support human thinking and knowing. Intelligent tools can work as a supporting environment in a similar way that Vygotsky puts forward the Zone of proximal development. This study tries to find some empirical signs of how students use the web with consideration to such theories. Ten students put notes about their web use in a diary and were finally interviewed. The web is a natural part of their life. The result shows that the students use the web 1) as an external memory 2) as a reference and "thought prop" and 3) as a source of inspiration and guidance. A conclusion is that educational systems with traditional views of knowledge should look for opportunities many students already know.

  • 41.
    Andersson, Mats
    KTH.
    Ubiquitous e-learning: a concept of virtual knowledge2002Inngår i: Web-based Learning: Men & Machines / [ed] Kwan R; Jia W; Chan J; Fong A; Cheung R, 2002, s. 115-122Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When attempting to communicate experiences and knowledge between people over distances in time and space we can use the abilities of information technology. With an increase in access to information resources, teaching aids and information facilities, the user can postpone learning to a moment when knowledge is needed. Learning can occur simultaneously with knowledge being used. Sometimes learning even becomes superfluous as it is replaced by technology. A problem that usually needs some specific knowledge to be solved can be solved with support from an information resource, as a kind of knowledge-on-loan. This is nothing new, a textbook can provide knowledge-on-loan. But one gets something qualitative different when one constantly can access information - one cannot walk around with a library. The user can exceed his ability to solve certain tasks in a way that is comparable to a person with such knowledge. To an observer it might look as if the user has the knowledge, here called virtual knowledge. The borderline between information and the users knowledge tends to be vague, and in many cases dependent of the viewpoint. This article will put some light on these questions and is intended to mark out a direction for further research.

  • 42.
    Andersson, Mats
    KTH, Tidigare Institutioner                               , Data- och systemvetenskap, DSV.
    Why Do Students Use the Web: What Affordances Are Experienced?2003Inngår i: Advances in Technology-based Education: Towards a Knowledge-based Society, 2003, s. 288-292Konferansepaper (Fagfellevurdert)
  • 43.
    Andersson, Mats B.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Data- och systemvetenskap, DSV.
    Allestädes närvarande kunskap: webbplatser som informativt stöd2005Doktoravhandling, med artikler (Annet vitenskapelig)
  • 44.
    Andersson, Mats
    et al.
    KTH, Skolan för datavetenskap och kommunikation (CSC), Numerisk Analys och Datalogi, NADA.
    Persson, Christian
    KTH, Skolan för datavetenskap och kommunikation (CSC), Numerisk Analys och Datalogi, NADA.
    Meeting the users need for knowledge: a concept of a learning domainManuskript (preprint) (Annet vitenskapelig)
  • 45.
    Andersson, Mats
    et al.
    KTH, Tidigare Institutioner                               , Numerisk analys och datalogi, NADA.
    Svärd, Kenneth
    KTH, Tidigare Institutioner                               , Numerisk analys och datalogi, NADA.
    Producer studies: informative web sites from the inside2004Inngår i: Proceedings of Interactive Computer Aided Learning (ICL), 2004, s. 1-12Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An emerging genre of web sites can be described with the following characteristics: asubject is well defined; the subject is well covered; a publicist takes responsibility forwhat is published; and the publicist has a certain authority within the field of the subject.Such sites can function as teaching tools or as substitutes for the user’s knowledge.In the long run, the user will know more about the subject, i.e. the site supportslifelong learning and learning on-demand. These sites seem to have an informative"mission" and are run by public authorities, corporations or other organizations.Subjects can be medical care, health, tourism, sports etc. This paper presents a studyof how producers work and experience their production of informative content. Theinterviews were conducted in 2004 with people employed at Swedish sites.

  • 46. Andersson-Schwarz, Jonas
    et al.
    Christensen, Christian
    Eellend, Beate
    Hadley Kamptz, Isobel
    Karlgren, Jussi
    KTH, Skolan för datavetenskap och kommunikation (CSC), Teoretisk datalogi, TCS.
    Thorslund, Ewa
    Wormbs, Nina
    Filosofi och historia, KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Filosofi och teknikhistoria, Historiska studier av teknik, vetenskap och miljö.
    Transaktionsdimman på nätet hotar digitaliseringen2017Inngår i: Dagens NyheterArtikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    På nätet är vi inte längre bara medborgare eller kunder. Vi är också varor. De data vi läm-nar ut om oss själva är vad andra tjänar pengar på. Men vi vet inte vad de är värda ochvad vi skulle kunna begära i betalning. Transaktionsdimman på internet bör skingrasoch ersättas av transaktionstransparens, skriver sju medie- och it-debattörer.

  • 47. Annosi, M. C.
    et al.
    Martini, A.
    Magnusson, Mats
    KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.). LUISS School of Business and Management, Italy.
    Investigating the impact of agile control mechanisms on learning in scrum teams2017Inngår i: Learning and Innovation in Hybrid Organizations: Strategic and Organizational Insights, Springer International Publishing , 2017, s. 213-229Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    This chapter aims to explore Management Control Systems (MCS) resulting from the implementation of agile development methods, relying on an established MCS taxonomy. An abductive approach was adopted, considering the shortage of research evaluating the post-adoption effects of agile methods. Four organizations from an international telecommunication firm that implemented agile methods were involved, and 44 individual semi-structured interviews were performed. In addition, 121 free comments from a global survey to the same organizations were used as secondary data. The paper indicates how Scrum, a widespread agile method, implicitly brings multiple enforcing levers of control to a team’s self-regulatory learning processes.

  • 48.
    Apanasevic, Tatjana
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
    Challenges Related to the Introduction of Innovative Services in the Market: Mobile Payment Services in the Swedish Retail Industry2015Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Mobile payment services are expected to be the next step of the electronic payment evolution. However, the level of penetration in European countries is lower than expected. The focus of most academic research has been in two main areas: (i) mobile payment adoption by consumers and (ii) technical aspects of the service. Consequently, a number of themes remain under-researched. In order to expand knowledge on reasons that affect the wider penetration of mobile payments, challenges related to the introduction of mobile payment services in the market have been explored in this thesis.

    More specifically, this research has addressed two problem areas: (i) why mobile payments have not been widely adopted by merchants; and (ii) what effects that the introduction of mobile payments has had on the business networks of the involved actors. As an example, we use the mobile payment services applied in the Swedish retail industry. The study is focused on the main groups of stakeholders – the mobile payment providers, the retailers, and the consumers.

    First, this study has helped to identify what different stakeholders expect of mobile payments and how these services correspond to their needs. In order to analyse the expectations of stakeholders, we have developed an analysis framework based on the theory of diffusion of innovations, the Technology Acceptance Model (TAM), and the theory of network externalities. The analysis highlights the expectations of stakeholders and helps to understand what kind of mobile payment service merchants expect and are willing to adopt. One key finding is that existing mobile payment services for retailing could be further improved in order to ensure an enhanced purchasing process for consumers.

    Second, the research has explored the impact of mobile payment services on the business networks. In order to analyse the relationships and cooperation between business actors, and changes in business strategy and network structure, we used the approach proposed by the Industrial Marketing and Purchasing (IMP) Group. The performed analysis illustrates the following changes in the structure of business networks for the traditional payment solutions (bank cards): (i) emergence of new business actors (i.e. independent mobile payment providers); (ii) new roles and activities of business actors; and (iii) exclusion of traditional business actors (i.e. banks) from the mobile payment systems.

    All these changes lead to increased complexity of relationships and increased level of interdependence between business actors within the networks. The following changes in the strategies of involved actors have been identified: (i) mobile payment providers seek to achieve a control over the business network; (ii) the retailers affect strategies of the mobile payment providers; (iii) the marketing strategies of business actors include cross-marketing in different sectors. All these changes result in additional value and enhanced quality of service for consumers.

    In order to analyse a complex and multidisciplinary area such as mobile payments, it is beneficial to use more than one analysis approach. A combination of different complementing methods helps to explore different aspects of the phenomenon and provides a more comprehensive overview of several research aspects.

    This work contributes to the academic research of mobile payment service adoption by merchants through proposing a theoretical analysis framework. More specifically, the research addresses a new area – expectations of retailers when new solutions are introduced. The framework consists of the following criteria and aspects: technological feasibility, economic benefits, lower service costs, added value of services, network externalities and the problem of critical mass, and finally, ease of use. This framework helps to identify what merchants can expect of mobile payment services.

    Another area of contribution is the analysis of the effect that mobile payments make on the actors and business networks of traditional payment services. The introduction of new services results in emergence of new business actors, a need to establish new relationships, and increased complexity of a business network. Moreover, in order to succeed, cooperation between all network actors is needed. As a result, business actors have to adjust their services and strategies according to needs of others.

  • 49.
    Apelkrans, Mats
    et al.
    Dept of Informatics, Jönköping International Business School.
    Håkansson, Anne
    Uppsala University, Sweden.
    Information Coordination Using Meta-agents in Information Logistics Processes2008Inngår i: Proceedings of Knowledge-Based and Intelligent Information & Engineering Systems: KES2008 / [ed] Ignac Lovrek, Robert J. Howlett, Lakhmi C. Jain, Berlin Heidelberg: Springer Berlin/Heidelberg, 2008, s. 788-798Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In order to coordinate and deliver information in the right time and to the right place, theories from multi-agent systems and information logistics are combined. We use agents to support supply chain by searching for company specific information. Hence, there are a vast number of agents working at the Internet, simultaneously, which requires supervising agents. In this paper, we suggest using meta-agents to control the behaviour of a number of intelligent agents, where the meta-agents are working with coordination of the communication that takes place in a supply chain system. As an example, we look at a manufacturing company receiving orders on items from customers, which need to be produced. The handling of this distributed information flow can be thought of as an Information Logistics Processes and the similarities of the functioning of processes and intelligent agents’ behaviour are illuminated.

  • 50.
    Apelkrans, Mats
    et al.
    Dept of Informatics, Jönköping International Business School.
    Håkansson, Anne
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikation: Infrastruktur och tjänster (Stängd 20120101), Programvaru- och datorsystem, SCS (Stängd 20120101).
    Visual knowledge modeling of an Information Logistics Process: A case study2005Inngår i: Intellectual Capital, Knowledge Management and Organisational Learning: ICICKM 2005 / [ed] Dan Remenyi, Reading, UK: ACPI , 2005Konferansepaper (Fagfellevurdert)
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