Supplementary information for the paper "Theory Makes Global IR Hang Together. Lessons from ... more Supplementary information for the paper "Theory Makes Global IR Hang Together. Lessons from Citation Analysis" by Thomas Risse, Wiebke Wemheuer-Vogelaar, and Frank Havemann, available at: Refubium-OSI-IR-group
Following Henry Small in his approach to cocitation analysis, highly cited sources are seen as co... more Following Henry Small in his approach to cocitation analysis, highly cited sources are seen as concept symbols of research fronts. But instead of cocited sources, I cluster citation links, which are the thematically least heterogenous elements in bibliometric studies. To obtain clusters representing topics characterized by concepts, I restrict link clustering to citation links to highly cited sources. Clusters of citation links between papers in a political-science subfield (international relations) and 300 of their sources most cited in the period 2006–2015 are constructed by a local memetic algorithm. It finds local minima in a cost landscape corresponding to clusters, which can overlap each other pervasively. The clusters obtained are well separated from the rest of the network but can have suboptimal cohesion. Cohesive cores of topics are found by applying an algorithm that constructs core-periphery structures in link sets. In this methodological paper I discuss some initial clu...
In spite of recent advances in field delineation methods, enduring problems such as the impossibi... more In spite of recent advances in field delineation methods, enduring problems such as the impossibility to justify necessary thresholds and the difficulties in comparing thematic structures obtained by different algorithms leave bibliometricians with a sense of uneasiness about their methods. In this paper, we propose and demonstrate a new approach to the delineation of thematic structures that attempts to fit the methods for topic delineation to the properties of topics. We derive principles of topic delineation from a theoretical discussion of thematic structures in science. Applying these principles, we cluster citation links rather than publication nodes, use predominantly local information and grow communities of links from seeds in order to allow for pervasive overlaps of topics. The complexity of the clustering task requires the application of a memetic algorithm that combines probabilistic evolutionary strategies with deterministic local searches. We demonstrate our approach b...
Wenn Fachzeitschriften auf eigene Artikel-Server verzichten und stattdessen als zusatzliche Infor... more Wenn Fachzeitschriften auf eigene Artikel-Server verzichten und stattdessen als zusatzliche Informationsschicht uber frei zugangliche Fachrepositorien von Preprints gelegt werden, kann Wissenschaftskommunikation weitaus effektiver und kostengunstiger organisiert werden als mit von profitorientierten Verlagen herausgegebenen Journalen, egal ob diese closed oder open access aufweisen.
Introduction The possibility that new instruments for the governance of science might reduce rese... more Introduction The possibility that new instruments for the governance of science might reduce research diversity, which is a frequent point of discussion both in policy and policy research, motivates our search for methods for measuring the diversity of research in social units such as (inter)national scientific communities or research organisations. We are currently experimenting with the extraction of latent themes from bipartite networks of papers and cited sources, for which we use a variant of latent semantic analysis (LSA) based on singular value decomposition (SVD) of paper-source matrices (Deerwester, Dumais, Furnas, Landauer, & Harshman, 1990; Mitesser, Heinz, Havemann, & Gläser, 2008). We argued that SVD is a preferable algorithm for this purpose, because papers and sources can be attributed to more than one theme, which is much more realistic than usual hard clustering (Mitesser et al., 2008, p. 5; cf. Janssens, Glänzel, and De Moor, 2007). We showed that our SVD-based div...
Ausgehend von der Entstehungsgeschichte von Repositorien elektronischer Dokumente wird die Frage ... more Ausgehend von der Entstehungsgeschichte von Repositorien elektronischer Dokumente wird die Frage der Qualitatskontrolle im Open-Access-Bereich diskutiert sowie der Mehrwert von Zitationsindizes fur Nutzer als Leser und Autoren wissenschaftlicher Dokumente. Details eines moglichen Zitationsindex von Open-Access-Dokumenten in Repositorien deutscher wissenschaftlicher Institutionen werden geschildert. Qualitatskontrolle von Open-Access-Dokumenten
Supplementary information for the paper "Theory Makes Global IR Hang Together. Lessons from ... more Supplementary information for the paper "Theory Makes Global IR Hang Together. Lessons from Citation Analysis" by Thomas Risse, Wiebke Wemheuer-Vogelaar, and Frank Havemann, available at: Refubium-OSI-IR-group
Following Henry Small in his approach to cocitation analysis, highly cited sources are seen as co... more Following Henry Small in his approach to cocitation analysis, highly cited sources are seen as concept symbols of research fronts. But instead of cocited sources, I cluster citation links, which are the thematically least heterogenous elements in bibliometric studies. To obtain clusters representing topics characterized by concepts, I restrict link clustering to citation links to highly cited sources. Clusters of citation links between papers in a political-science subfield (international relations) and 300 of their sources most cited in the period 2006–2015 are constructed by a local memetic algorithm. It finds local minima in a cost landscape corresponding to clusters, which can overlap each other pervasively. The clusters obtained are well separated from the rest of the network but can have suboptimal cohesion. Cohesive cores of topics are found by applying an algorithm that constructs core-periphery structures in link sets. In this methodological paper I discuss some initial clu...
In spite of recent advances in field delineation methods, enduring problems such as the impossibi... more In spite of recent advances in field delineation methods, enduring problems such as the impossibility to justify necessary thresholds and the difficulties in comparing thematic structures obtained by different algorithms leave bibliometricians with a sense of uneasiness about their methods. In this paper, we propose and demonstrate a new approach to the delineation of thematic structures that attempts to fit the methods for topic delineation to the properties of topics. We derive principles of topic delineation from a theoretical discussion of thematic structures in science. Applying these principles, we cluster citation links rather than publication nodes, use predominantly local information and grow communities of links from seeds in order to allow for pervasive overlaps of topics. The complexity of the clustering task requires the application of a memetic algorithm that combines probabilistic evolutionary strategies with deterministic local searches. We demonstrate our approach b...
Wenn Fachzeitschriften auf eigene Artikel-Server verzichten und stattdessen als zusatzliche Infor... more Wenn Fachzeitschriften auf eigene Artikel-Server verzichten und stattdessen als zusatzliche Informationsschicht uber frei zugangliche Fachrepositorien von Preprints gelegt werden, kann Wissenschaftskommunikation weitaus effektiver und kostengunstiger organisiert werden als mit von profitorientierten Verlagen herausgegebenen Journalen, egal ob diese closed oder open access aufweisen.
Introduction The possibility that new instruments for the governance of science might reduce rese... more Introduction The possibility that new instruments for the governance of science might reduce research diversity, which is a frequent point of discussion both in policy and policy research, motivates our search for methods for measuring the diversity of research in social units such as (inter)national scientific communities or research organisations. We are currently experimenting with the extraction of latent themes from bipartite networks of papers and cited sources, for which we use a variant of latent semantic analysis (LSA) based on singular value decomposition (SVD) of paper-source matrices (Deerwester, Dumais, Furnas, Landauer, & Harshman, 1990; Mitesser, Heinz, Havemann, & Gläser, 2008). We argued that SVD is a preferable algorithm for this purpose, because papers and sources can be attributed to more than one theme, which is much more realistic than usual hard clustering (Mitesser et al., 2008, p. 5; cf. Janssens, Glänzel, and De Moor, 2007). We showed that our SVD-based div...
Ausgehend von der Entstehungsgeschichte von Repositorien elektronischer Dokumente wird die Frage ... more Ausgehend von der Entstehungsgeschichte von Repositorien elektronischer Dokumente wird die Frage der Qualitatskontrolle im Open-Access-Bereich diskutiert sowie der Mehrwert von Zitationsindizes fur Nutzer als Leser und Autoren wissenschaftlicher Dokumente. Details eines moglichen Zitationsindex von Open-Access-Dokumenten in Repositorien deutscher wissenschaftlicher Institutionen werden geschildert. Qualitatskontrolle von Open-Access-Dokumenten
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