Bornmann, Lutz, Leydesdorff, Loet, Besselaar, Peter Van Den
Combining different data sets with information on grant and fellowship applications submitted to two renowned funding agencies, we are able to compare their funding decisions (award and rejection)...
Hyper-incursion and the Globalization of the Knowledge-Based Economy (2009)
In biological systems, the capacity of anticipation--that is, entertaining a model of the system within the system--can be considered as naturally given. Human languages enable psychological systems...
The Biological Metaphor of a Second-Order Observer and the Sociological Discourse (2009)
Purpose: In the tradition of Spencer Brown's (1969) Laws of Form, observation was defined in Luhmann's (1984) social systems theory as the designation of a distinction. In the sociological design,...
Deinema, Michael, Leydesdorff, Loet
Purpose: The mismatches between political discourse and military momentum in the American handling of the Cuban missile crisis are explained by using the model of the potential autopoiesis of...
The Import and Export of Cognitive Science (2009)
Goldstone, Rob, Leydesdorff, Loet
From its inception, a large part of the motivation for Cognitive Science has been the need for an interdisciplinary journal for the study of minds and intelligent systems. One threat to the...
Multiple Presents: How Search Engines Re-write the Past (2009)
Hellsten, Iina, Leydesdorff, Loet, Wouters, Paul
Internet search engines function in a present which changes continuously. The search engines update their indices regularly, overwriting Web pages with newer ones, adding new pages to the index, and...
Measuring the Globalization of Knowledge Networks (2009)
Wagner, Caroline S., Leydesdorff, Loet
This paper presents a method of understanding the growth of global science as resulting from a mechanism of preferential attachment within networks. The paper seeks to contribute to the development...
Anticipation and the Non-linear Dynamics of Meaning-Processing in Social Systems (2009)
Social order does not exist as a stable phenomenon, but can be considered as "an order of reproduced expectations." When anticipations operate upon one another, they can generate a non-linear...
Triple Helix Indicators of Knowledge-Based Innovation Systems (2009)
Leydesdorff, Loet, Meyer, Martin
When two selection environments operate upon each other, mutual shaping in a co-evolution along a particular trajectory is one possible outcome. When three selection environments are involved, more...
Leydesdorff, Loet, Hellsten, Iina
Co-words have been considered as carriers of meaning across different domains in studies of science, technology, and society. Words and co-words, however, obtain meaning in sentences, and sentences...
Leydesdorff, Loet, Fritsch, Michael
The interaction among the three sub-dynamics of economic exchange, technological innovation, and institutional control can be captured with a generalized Triple Helix model. We propose to use the...
Leydesdorff, Loet, Dolfsma, Wilfred, Van Der Panne, Gerben
Can the knowledge base of an economy be measured? In this study, we combine the perspective of regional economics on the interrelationships among technology, organization, and territory with the...
The aggregated citation relations among journals included in the Science Citation Index provide us with a huge matrix which can be analyzed in various ways. Using principal component analysis or...
Classification and Powerlaws: The Logarithmic Transformation (2009)
Leydesdorff, Loet, Bensman, Stephen
Logarithmic transformation of the data has been recommended by the literature in the case of highly skewed distributions such as those commonly found in information science. The purpose of the...
The Emergence of China as a Leading Nation in Science (2009)
China has become the fifth leading nation in terms of its share of the world's scientific publications. The citation rate of papers with a Chinese address for the corresponding author also exhibits...
Leydesdorff, Loet, Vaughan, Liwen
Co-occurrence matrices, such as co-citation, co-word, and co-link matrices, have been used widely in the information sciences. However, confusion and controversy have hindered the proper statistical...
"While a Storm is Raging on the Open Sea": Regional Development in a Knowledge-based Economy (2009)
The Triple Helix of university-industry-government relations is elaborated into a systemic model that accounts for interactions among three dimensions. By distinguishing between the respective...
Regional Development in the Knowledge-Based Economy: The Construction of Advantage (2009)
Cooke, Phil, Leydesdorff, Loet
In this introduction the editors showcase the papers by way of a structured project and seek to clarify the two key concepts cited in the title. We consider the history of the idea that knowledge is...
Past Performance as Predictor of Successful Grant Applications: A Case Study (2009)
Besselaar, Peter Van Den, Leydesdorff, Loet
Competitive allocation of research funding is a major mechanism within the science system. It is fundamentally based on the idea of peer review. Peer review is central in project selection as peers...
Citation Environment of Angewandte Chemie (2009)
Bornmann, Lutz, Leydesdorff, Loet, Marx, Werner
Recently, aggregated journal-journal citation networks were made accessible from the perspective of each journal included in the Science Citation Index see (http://www.leydesdorff.net/). The local...
The journal structure in the China Scientific and Technical Papers and Citations Database (CSTPCD) is analysed from three perspectives: the database level, the specialty level and the institutional...
The Citation Impacts and Citation Environments of Chinese Journals in Mathematics (2009)
Based on the citation data of journals covered by the China Scientific and Technical Papers and Citations Database (CSTPCD), we obtained aggregated journal-journal citation environments by applying...
Can change in citation patterns among journals be used as an indicator of structural change in the organization of the sciences? Aggregated journal-journal citations for 1999 are compared with...
The citation impact of Environment and Planning B can be visualized using its citation relations with journals in its environment as the links of a network. The size of the nodes is varied in...
The intellectual organization of the sciences cannot be appreciated sufficiently unless the cognitive dimension is considered as an independent source of variance. Cognitive structures interact and...
From the perspective of cultural studies and critical theory, Luhmann's communication-theoretical approach in sociology can still be read as a meta-biology: while biologists take the development of...
"Betweenness Centrality" as an Indicator of the "Interdisciplinarity" of Scientific Journals (2009)
In addition to science citation indicators of journals like impact and immediacy, social network analysis provides a set of centrality measures like degree, betweenness, and closeness centrality....
The two Journal Citation Reports of the Science Citation Index 2004 and the Social Science Citation Index 2004 were combined in order to analyze and map journals and specialties at the edges and in...
Nanotechnology as a Field of Science: Its Delineation in terms of Journals and Patents (2009)
The Journal Citation Reports of the Science Citation Index 2004 were used to delineate a core set of nanotechnology journals and a nanotechnology-relevant set. In comparison with 2003, the core set...
Knowledge Emergence in Scientific Communication: From "Fullerenes" to "Nanotubes" (2009)
Lucio-Arias, Diana, Leydesdorff, Loet
This article explores the emergence of knowledge from scientific discoveries and their effects on the structure of scientific communication. Network analysis is applied to understand this emergence...
The Scientometrics of a Triple Helix of University-Industry-Government Relations (2009)
Leydesdorff, Loet, Meyer, Martin
We distinguish between an internal differentiation of science and technology that focuses on instrumentalities and an external differentiation in terms of the relations of the knowledge production...
Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made...
Journals as constituents of scientific discourse: economic heterodoxy (2009)
Dolfsma, Wilfred, Leydesdorff, Loet
Purpose: to provide a view and analysis of the immediate field of journals which surround a number of key heterodox economics journals. Design/methodology/approach: Using citation data from the...
Configurational Information as Potentially Negative Entropy: The Triple Helix Model (2009)
Configurational information is generated when three or more sources of variance interact. The variations not only disturb each other relationally, but by selecting upon each other, they are also...
Leydesdorff, Loet, Schank, Thomas
The dynamic analysis of structural change in the organization of the sciences requires methodologically the integration of multivariate and time-series analysis. Structural change--e.g.,...
International Collaboration in Science and the Formation of a Core Group (2009)
Leydesdorff, Loet, Wagner, Caroline
International collaboration as measured by co-authorship relations on refereed papers grew linearly from 1990 to 2005 in terms of the number of papers, but exponentially in terms of the number of...
Patent Classifications as Indicators of Intellectual Organization (2009)
Using the 138,751 patents filed in 2006 under the Patent Cooperation Treaty, co-classification analysis is pursued on the basis of three- and four-digit codes in the International Patent...
Caveats for the Use of Citation Indicators in Research and Journal Evaluations (2009)
Ageing of publications, percentage of self-citations, and impact vary from journal to journal within fields of science. The assumption that citation and publication practices are homogenous within...
The journal set which provides a representation of nanoscience and nanotechnology at the interfaces among applied physics, chemistry, and the life sciences is developing rapidly because of the...
The debate about which similarity measure one should use for the normalization in the case of Author Co-citation Analysis (ACA) is further complicated when one distinguishes between the symmetrical...
Psychological and social systems provide us with a natural domain for the study of anticipations because these systems are based on and operate in terms of intentionality. Psychological systems can...
Complexity science and intentional systems (2009)
In their position paper entitled "Towards a new, complexity science of learning and education", Jorg et al. (2007) argue that educational research is in crisis. In their opinion, the...
Co-word Analysis using the Chinese Character Set (2009)
Until recently, Chinese texts could not be studied using co-word analysis because the words are not separated by spaces in Chinese (and Japanese). A word can be composed of one or more characters....
Main-path analysis and path-dependent transitions in HistCite(TM)-based historiograms (2009)
Lucio-Arias, Diana, Leydesdorff, Loet
With the program HistCite(TM) it is possible to generate and visualize the most relevant papers in a set of documents retrieved from the Science Citation Index. Historical reconstructions of...
Dolfsma, Wilfred, Leydesdorff, Loet
In this paper we offer a way to measure the knowledge base of an economy in terms of probabilistic entropy. This measure, we hypothesize, is an indication of the extent to which a system, including...
Park, Han Woo, Leydesdorff, Loet
During the last decade, we have witnessed a sustained growth of South Korea's research output in terms of the world share of publications in the Science Citation Index database. However, Korea's...
Arencibia-Jorge, Ricardo, Leydesdorff, Loet, Chinchilla-Rodriguez, Zaida, Rousseau, Ronald, Paris, Soren W.
The current communication presents a simple exercise with the aim of solving a singular problem: the retrieval of extremely large amounts of items in the Web of Science interface. As it is known, Web...
Besselaar, Peter Van Den, Leydesdorff, Loet
Does past performance influence success in grant applications? In this study we test whether the grant allocation decisions of the Netherlands Research Council for the Economic and Social Sciences...
Lucio-Arias, Diana, Leydesdorff, Loet
Discursive knowledge emerges as codification in flows of communication. The flows of communication are constrained and enabled by networks of communications as their historical manifestations at each...
Lock-in & Break-out from Technological Trajectories: Modeling and policy implications (2009)
Dolfsma, Wilfred, Leydesdorff, Loet
Arthur [1,2] provided a model to explain the circumstances that lead to technological lock-in into a specific trajectory. We contribute substantially to this area of research by investigating the...
The relation between Pearson's correlation coefficient r and Salton's cosine measure (2009)
The relation between Pearson's correlation coefficient and Salton's cosine measure is revealed based on the different possible values of the division of the L1-norm and the L2-norm of a vector. These...
This research analyzes a "who cites whom" matrix in terms of aggregated, journal-journal citations to determine the location of communication studies on the academic spectrum. Using the Journal of...
The Non-linear Dynamics of Meaning-Processing in Social Systems (2009)
Social order cannot be considered as a stable phenomenon because it contains an order of reproduced expectations. When the expectations operate upon one another, they generate a non-linear dynamics...
Although Luhmann formulated with modesty and precaution, for example in Die Wissenschaft der Gesellschaft (1990a, at pp. 412f.), that his theory claims to be a universal one because it is...
Leydesdorff, Loet, Wagner, Caroline
Based on the Science Citation IndexExpanded webversion, the USA is still by far the strongest nation in terms of scientific performance. Its relative decline in percentage share of publications is...
Macro-level Indicators of the Relations between Research Funding and Research Output (2009)
Leydesdorff, Loet, Wagner, Caroline
In response to the call for a science of science policy, we discuss the contribution of indicators at the macro-level of nations from a scientometric perspective. In addition to global trends such as...
The communication of meaning in social systems (2009)
Leydesdorff, Loet, Franse, Sander
The sociological domain is different from the psychological one insofar as meaning can be communicated at the supra-individual level (Schutz, 1932; Luhmann, 1984). The computation of anticipatory...
Leydesdorff, Loet, Probst, Carole
A journal set in an interdisciplinary or newly developing area can be determined by including the journals classified under the most relevant ISI Subject Categories into a journal-journal citation...
International co-authorship relations and university-industry-government ("Triple Helix") relations have hitherto been studied separately. Using Japanese (ISI) publication data for the period...
A Global Map of Science Based on the ISI Subject Categories (2009)
Leydesdorff, Loet, Rafols, Ismael
The ISI subject categories classify journals included in the Science Citation Index (SCI). The aggregated journal-journal citation matrix contained in the Journal Citation Reports can be aggregated...
How are new citation-based journal indicators adding to the bibliometric toolbox? (2009)
The launching of Scopus and Google Scholar, and methodological developments in Social Network Analysis have made many more indicators for evaluating journals available than the traditional Impact...
Leydesdorff, Loet, Guerrero-Bote, Vicente P.
Using the Scopus dataset (1996-2007) a grand matrix of aggregated journal-journal citations was constructed. This matrix can be compared in terms of the network structures with the matrix contained...
Rafols, Ismael, Leydesdorff, Loet
The aggregated journal-journal citation matrix -based on the Journal Citation Reports (JCR) of the Science Citation Index- can be decomposed by indexers and/or algorithmically. In this study, we test...
Classification: Restricted (2008)
Prof Ian Butterworth, Dr. Loet Leydesdorff
providing detailed and insightful comments. This report has benefited from their comments more than the few explicit references would indicate. All remaining insufficiencies and errors remain our...
Leydesdorff, Loet, Schank, Thomas, Scharnhorst, Andrea, De Nooy, Wouter
The animation of network visualizations poses technical and theoretical challenges. Rather stable patterns are required before the mental map enables a user to make inferences over time. In order to...
The Editorial and Advisory Board and the Publishers of Scientometrics are glad (2008)
Loet Leydesdorff, Ronald Rousseau, Ronald Rousseau
to announce that the 2003 Derek John de Solla Price Medal has been awarded to
International co-authorship relations and university-industry-government (“Triple Helix”) relations have hitherto been studied separately. Using Japanese (ISI) publication data for the period...
Caveats for the Use of Citation Indicators in Research and Journal Evaluations (2008)
Ageing of publications, percentage of self-citations, and impact vary from journal to journal within fields of science. The assumption that citation and publication practices are homogenous within...
Reading the Dynamics of a Knowledge Economy, (2008)
Few concepts introduced by evolutionary economists have been more successful than that of
Loet Leydesdorff, Iina Hellsten, Science Leydesdorff Communication
“Stem cell research ” has become a subject of political discussion in recent years because of its social and ethical implications. The intellectual research program, however, has a history of...
Iina Hellsten, Loet Leydesdorff, Paul Wouters, Paul Wouters
Citations (this article cites 10 articles hosted on the
In this study, the authors have three objectives:
Can change in citation patterns among journals be used as an indicator of structural change in the organization of the sciences? Aggregated journaljournal citations for 1999 are compared with similar...
Anticipation and the Non-linear Dynamics of Meaning-Processing in Social Systems (2008)
Social order does not exist as a stable phenomenon, but can be considered as “an order of reproduced expectations. ” When anticipations operate upon one another, they can generate a non-linear...
The aggregated journal-journal citation matrix derived from the Journal Citation Reports 2001 can be decomposed into a unique subject classification by using the graph-analytical algorithm of...
Loet Leydesdorff, Scientometrics Forthcoming
The journal set which provides a representation of nanoscience and nanotechnology at the interfaces among applied physics, chemistry, and the life sciences is developing rapidly because of the...
Lutz Bornmann, Loet Leydesdorff, Werner Marx
Citation environment of Angewandte Chemie Recently, aggregated journal-journal citation networks were made accessible from the perspective of each journal included in the Science Citation Index (see
Using the 138,751 patents filed in 2006 under the Patent Cooperation Treaty, co-classification analysis is pursued on the basis of three- and four-digit codes in the International Patent...
The debate about which similarity measure one should use for the normalization in the case of Author Co-citation Analysis (ACA) is further complicated when one distinguishes between the symmetrical...
The use of Pearson’s correlation coefficient in Author Cocitation Analysis was compared with Salton’s cosine measure in a number of recent contributions. Unlike the Pearson correlation, the...
Mapping the Chinese Science Citation Database (2008)
Methods developed for mapping the journal structures contained in aggregated journaljournal citations in the Science Citation Index are applied to the Chinese Science Citation Database of the Chinese...
Hyperincursion and the globalization of a knowledge-based economy (2008)
Abstract. In biological systems, the capacity of anticipation—that is, entertaining a model of the system within the system—can be considered as naturally given. Human languages enable...
Michaël Deinema, Loet Leydesdorff
The mismatches between political discourse and military momentum in the American handling of the Cuban missile crisis are explained by using the model of the potential autopoiesis of subsystems....
Rethinking Interactive Communication: New Interdisciplinary Horizons, (2008)
Amsterdam John Benjamins, Loet Leydesdorff
Both ‘actions ’ and ‘interactions ’ can be considered as micro-operations that can be aggregated from a systemic perspective. Whereas actions operate historically, interactions provide the...
Ageing of publications, percentage of self-citations, and impact vary from journal to journal within fields of science. The assumption that citation and publication practices are homogenous within...
International Collaboration in Science and the Formation of a Core Group Abstract (2008)
Caroline S. Wagner, Loet Leydesdorff
International collaboration as measured by co-authorship relations on refereed papers grew linearly
Mapping Interdisciplinarity at the Interfaces between the (2008)
Science Citation Index 2004 were combined in order to analyze and map journals and specialties at the edges and in the overlap between the two databases. For journals which belong to the overlap...
The citation impact of Environment and Planning B can be visualized using its citation relations with journals in its environment as the links of a network. The size of the nodes is varied in...
ABSTRACT THE TRIPLE HELIX MODEL AND THE STUDY OF KNOWLEDGE-BASED INNOVATION SYSTEMS (2008)
This paper examines the changing nature of knowledge-based innovation systems in light of the dynamic interconnections between the university, industry and government. Industries have to assess in...
Sheila Tobias, Kenneth R. Smith, Loet Leydesdorff
an ecosystem for innovation – implications for management, policy
Luhmann’s (1984) social systems theory as the designation of a distinction. In the sociological design, however, the designation specifies only a category for the observation. The distinction...
It was not without irony that the philosopher Karl Popper (1963, at p. 35) told the following anecdote about a meeting with the psychoanalyst Alfred Adler: Once, in 1919, I reported to him a case...
Psychological and social systems provide us with a natural domain for the study of anticipations because these systems are based on and operate in terms of intentionality. Psychological systems can...
Loet Leydesdorff, Ismael Rafols
The ISI subject categories classify journals included in the Science Citation Index (SCI). The aggregated journal-journal citation matrix contained in the Journal Citation Reports can be aggregated...
Loet Leydesdorff, Martin Meyer
We distinguish between an internal differentiation of science and technology that focuses on instrumentalities and an external differentiation in terms of the relations of
From the perspective of cultural studies and critical theory, Luhmann’s communication-theoretical approach in sociology can still be read as a meta-biology: while biologists take the development of...
Loet Leydesdorff, Janelle Ward
The science-shop model was initiated in the Netherlands in the 1970s. During the 1980s, the model spread throughout Europe, but without much coordination. The crucial idea behind the science shops...
Han Woo Park, Loet Leydesdorff
During the last decade, we have witnessed a sustained growth of South Korea’s research output in terms of the world share of publications in the Science Citation Index database. However, Korea’s...
MEASURING THE KNOWLEDGE BASE: A PROGRAM OF INNOVATION STUDIES (2008)
Society Ngos Etc, Loet Leydesdorff, Andrea Scharnhorst, Loet Leydesdorff, Andrea Scharnhorst
Hohlfeld of the Berlin-Brandenburgische Akademie der Wissenschaften. The authors
Configurational Information as Potentially Negative Entropy: The Triple Helix Model (2008)
Configurational information is generated when three or more sources of variance interact. The variations not only disturb each other relationally, but by selecting upon each other, they are also...
Michaël Deinema, Loet Leydesdorff
The Cuban missile crisis of 1962 put extreme pressures on the relations between the American defense and decision-making apparatuses. While the military pushed for a military intervention, President...
Seismology A study of seismology as a dynamic, distributed area of scientific research (2007)
Caroline S. Wagner, Loet Leydesdorff
Seismology has several features that suggest it is a highly internationalized field: the subject matter is global, the tools used to analyse seismic waves are dependent upon information technologies,...
The (neo-)evolutionary model of a Triple Helix of University-Industry-Government Relations focuses on the overlay of expectations, communications, and interactions that potentially feed back on the...
Koen Frenken, Loet Leydesdorff
Using entropy statistics we analyse scaling patterns in terms of changes in the ratios among product characteristics of 143 designs in civil aircraft. Two allegedly dominant designs, the piston...
Schumpeter's (1939) distinction between changes in the form of the production function corresponding to innovation, and shifts along the production function corresponding to factor substitution,...
The competitive advantages in a knowledge-based economy can no longer be attributed to a single node in the network. The network coordinates the subdynamics of (i) wealth production, (ii) organized...
Science & Technology Studies oriented mailing lists (2007)
Andrs Zelman, Loet Leydesdorff
The paper addresses the potential of lnternet mailing lists to enhance academic research with respect to Gibbons ' distinction between Mode [ and Mode [I knowledge production (Gibbons t al.,...
return Can the ‘Knowledge-Base ’ of an Economy Be Measured? 1 * (2007)
The competitive advantages in a knowledge-based economy can no longer be attributed to a single node in the network. The network coordinates the subdynamics of (i) wealth production, (ii) organized...
The citation impacts and citation environments of Chinese journals in mathematics (2007)
Based on the citation data of journals covered by the China Scientific and Technical Papers and Citations Database (CSTPCD), we obtained aggregated journal-journal citation environments by applying...
Internet time and the reliability of search engines (2007)
Paul Wouters, Iina Hellsten, Loet Leydesdorff
Search engines are unreliable tools for data collection for research that aims to reconstruct the historical record. This unreliability is not caused by sudden instabilities of search engines. On the...
The journal structure in the China Scientific and Technical Papers and Citations Database (CSTPCD) is analyzed from three perspectives: the database level, the specialty level, and the institutional...
Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made...
Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made...
Loet Leydesdorff, Loet Leydesdorff
Citations (this article cites 20 articles hosted on the
journals) are made accessible from the perspective of any of these journals. A vector-space model is used for normalization, and the results are brought online at
Diana Lucio-arias, Loet Leydesdorff
This article explores the emergence of knowledge from scientific discoveries and their effects on the structure of scientific communication. Network analysis is applied to understand this emergence...
The Non-linear Dynamics of Meaning-Processing in Social Systems (2007)
Social order cannot be considered as a stable phenomenon because it contains an order of reproduced expectations. When the expectations operate upon one another, they generate a non-linear dynamics...
journals) are made accessible from the perspective of any of these journals. A vector-space model is used for normalization, and the results are brought online at
Leydesdorff, Loet, Wagner, Caroline S.
Based on the Science Citation Index–Expanded web-version, the USA is still by far the strongest nation in terms of scientific performance. Its relative decline in percentage share of publications...
The Knowledge-Based Economy (2006)
This is chapter 1 of the book (first 25 pages of a book with 392 pages). How can an economy based on something as volatile as knowledge be sustained? The urgency of improving our understanding of a...
Leydesdorff, Loet, Meyer, Martin
When two selection environments operate upon each other, mutual shaping in a co-evolution along a particular trajectory is one possible outcome. When three selection environments are involved, more...
Forthcoming in 2007 in the European Journal of Social Theory 10 (3). The intellectual organization of the sciences cannot be appreciated sufficiently unless the cognitive dimension is considered as...
"While a Storm is Raging on the Open Sea": Regional Development in a Knowledge-based Economy (2006)
The Triple Helix of university-industry-government relations is elaborated into a systemic model that accounts for interactions among three dimensions. By distinguishing between the respective...
Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made...
This is a preprint of an article published in Journal of the American Society for Information Science and Technology 57 (5):601-613, 2006. The aggregated citation relations among journals included in...
The two Journal Citation Reports of the Science Citation Index 2004 and the Social Science Citation Index 2004 were combined in order to analyze and map journals and specialties at the edges and in...
Leydesdorff, Loet, Hellsten, Iina
Published in Scientometrics 67(2), 2006, 231-258. Abstract: Co-words have been considered as carriers of meaning across different domains in studies of science, technology, and society. Words and...
Classification and Powerlaws: The logarithmic transformation (2006)
Leydesdorff, Loet, Bensman, Stephen
Published in Journal of the American Society for Information Science and Technology 57(11) (2006) 1470-1486. Abstract: Logarithmic transformation of the data has been recommended by the literature in...
Forthcoming in the Journal of the American Society for Information Science and Technology. Abstract: The journal structure in the China Scientific and Technical Papers and Citations Database (CSTPCD)...
Leydesdorff, Loet, Vaughan, Liwen
To be published in Journal of the American Society for Information Science & Technology 57(12) (2006) 1616-1628. Abstract: Co-occurrence matrices, such as co-citation, co-word, and co-link matrices,...
To be published in Environment and Planning B (2007; forthcoming). Abstract: The citation impact of Environment and Planning B can be visualized using its citation relations with journals in its...
Multiple Presents: How Search Engines Re-write the Past (2006)
Hellsten, Iina, Leydesdorff, Loet, Wouters, Paul
To be published in New Media & Society, 8(6), 2006 (forthcoming). Abstract: Internet search engines function in a present which changes continuously. The search engines update their indices...
Triple Helix indicators of knowledge-based innovation systems, Research Policy (forthcoming) (2006)
Leydesdorff, Loet, Meyer, Martin
When two selection environments operate upon each other, mutual shaping in a co-evolution along a particular trajectory is one possible outcome. When three selection environments are involved, more...
Leydesdorff, Loet, Dolfsma, Wilfred, Van Der Panne, Gerben
Can the knowledge base of an economy be measured? In this study, we combine the perspective of regional economics on the interrelationships among technology, organization, and territory with the...
The Emergence of China as a Leading Nation in Science. Research Policy, 35(1), 2006, 83-104. (2006)
China has become the fifth leading nation in terms of its share of the world’s scientific publications. The citation rate of papers with a Chinese address for the corresponding author also exhibits...
Cooke, Phil, Leydesdorff, Loet
In this introduction the editors showcase the papers by way of a structured project and seek to clarify the two key concepts cited in the title. We consider the history of the idea that knowledge is...
• Purpose • In the tradition of Spencer Brown’s (1969) Laws of Form, observation was defined in Luhmann’s (1984) social systems theory as the designation of a distinction. In the sociological...
Deinema, Michaël, Leydesdorff, Loet
• Purpose: The mismatches between political discourse and military momentum in the American handling of the Cuban missile crisis are explained by using the model of the potential autopoiesis of...
The Import and Export of Cognitive Science. Cognitive Science 30(6), 2006 (forthcoming). (2006)
Goldstone, Robert L., Leydesdorff, Loet
From its inception, a large part of the motivation for Cognitive Science has been the need for an interdisciplinary journal for the study of minds and intelligent systems. In the inaugural editorial...
King’s (2004) “The scientific impact of nations” published in the Nature has provided the data for the comparison among nation-states in terms of their research performance with reference to...
Based on the citation data of journals covered by the China Scientific and Technical Papers and Citations Database (CSTPCD), we obtained aggregated journal-journal citation environments by applying...
Leydesdorff, Loet, Fritsch, Michael
The interaction among the three sub-dynamics of economic exchange, technological innovation, and institutional control can be captured with a generalized Triple Helix model. We propose to use the...
Recognizing a Change in World Science System (2006)
Leydesdorff, Loet, Zhou, Ping, So, Min-ho, Park, Han
English Abstract: King’s (2004) “The scientific impact of nations” published in the Nature has provided the data for the comparison among nation-states in terms of their research performance...
The import and export of Cognitive Science (2006)
Goldstone, Robert L., Leydesdorff, Loet
From its inception, a large part of the motivation for Cognitive Science has been the need for an interdisciplinary journal for the study of minds and intelligent systems. In the inaugural editorial...
The import and export of Cognitive Science (2006)
Goldstone, Robert L., Leydesdorff, Loet
From its inception, a large part of the motivation for Cognitive Science has been the need for an interdisciplinary journal for the study of minds and intelligent systems. In the inaugural editorial...
Loet Leydesdorff, Liwen Vaughan
Co-occurrence matrices, such as co-citation, co-word, and co-link matrices, have been used widely in the information sciences. However, confusion and controversy have hindered the proper statistical...
While a Storm is Raging on the Open Sea”: Regional Development in a Knowledge-Based Economy (2006)
The Triple Helix of university-industry-government relations is elaborated into a systemic model that accounts for interactions among three dimensions. By distinguishing between the respective...
Betweenness Centrality” as an Indicator of the “Interdisciplinarity” of Scientific Journals (2006)
In addition to science citation indicators of journals like impact and immediacy, social network analysis provides a set of centrality measures like degree, betweenness, and closeness centrality....
Regional Development in the Knowledge-Based Economy: The Construction of Advantages (2006)
In this introduction the editors showcase the papers by way of a structured project and seek to clarify the two key concepts cited in the title. We consider the history of the idea that knowledge is...
The aggregated citation relations among journals included in the Science Citation Index provide us with a huge matrix which can be analyzed in various ways. Using principal component analysis or...
Classification and Powerlaws: The logarithmic transformation (2006)
Loet Leydesdorff, Stephen Bensman
(forthcoming) Logarithmic transformation of the data has been recommended by the literature in the case of highly skewed distributions such as those commonly found in information science. The purpose...
Meaning can be communicated in addition toand on top ofunderlying processes of the information exchange. Meaning is provided to observations from the perspective of hindsight, while information...
Meaning can be communicated in addition to—and on top of—underlying processes of the information exchange. Meaning is provided to observations from the perspective of hindsight, while information...
Aggregated journal-journal citation networks based on the Journal Citation Reports 2004 of the Science Citation Index (5968 journals) and the Social Science Citation Index (1712 journals) are made...
Hyperincursion and the globalization of a knowledge-based economy (2005)
This is an invited paper for the Seventh International Conference on Computing Anticipatory Systems CASYS’05, Liège, Belgium. August 8-13, 2005. It is forthcoming in American Institute of Physics,...
Leydesdorff, Loet, Ward, Janelle
The science-shop model was initiated in the Netherlands in the 1970s. During the 1980s, the model spread throughout Europe, but without much coordination. The crucial idea behind the science shops...
Institutions and their aggregates are not the right units of analysis for developing a science policy with cognitive goals in view. Institutions, however, can be compared in terms of their...
This paper examines the changing nature of knowledge-based innovation systems in light of the dynamic interconnections between the university, industry and government. Industries have to assess in...
This is published in the Journal of the American Society of Information Science & Technology, 56(14) 1469-1479. [The classification and mapping of journals is available at...
The use of Pearson’s correlation coefficient in Author Cocitation Analysis was compared with Salton’s cosine measure in a number of recent contributions. Unlike the Pearson correlation, the...
Research evaluation is based on a representation of the research. Improving the quality of the representations cannot prevent the indicators from being provided with meaning by a receiving discourse...
Wagner, Caroline S., Leydesdorff, Loet
Using data from co-authorships at the international level in all fields of science in 1990 and 2000, and within six case studies at the sub-field level in 2000, different explanations for the growth...
Methods developed for mapping the journal structure contained in aggregated journal-journal citations in the Science Citation Index are applied to the Chinese Science Citation Database of the Chinese...
Meaning can be communicated in addition to—and on top of—underlying processes of the information exchange. Meaning is provided to observations from the perspective of hindsight, while information...
Are the contributions of China and Korea upsetting the world system of science (2005)
Institutions and their aggregates are not the right units of analysis for developing a science policy with cognitive goals in view. Institutions, however, can be compared in terms of their...
Network structure, self-organization, and the growth of international collaboration (2005)
Caroline S. Wagner, Loet Leydesdorff
Using data from co-authorships at the international level in all fields of science in 1990 and 2000, and within six case studies at the sub-field level in 2000, different explanations for the growth...
Han Woo Park, Heung Deug Hong, Loet Leydesdorff
Scientometrics (2005; forthcoming) This paper elaborates on the Triple Helix model for measuring the emergence of a knowledge base of socio-economic systems. The ‘knowledge infrastructure ’ is...
Ronald N. Kostoff, Héctor D. Cortés, Charles Smith, Andrew Smith, Caroline Wagner, ...
Clustering methodologies for identifying country core
Michael Søgaard Jørgensen, Andrea Gnaiger, Gabriela Schroffenegger, Søsser Brodersen, Regina Reimer, ...
A project funded by the European Commission/DG 12 under the Fifth RTD Framework Programme Contract No. HPV1-CT-2001-60039 I Authors of the final report Science Shop at the Technical University of...
Anticipation in Social Systems: The Incursion and Communication of Meaning (2004)
Loet Leydesdorff, Daniel M. Dubois, Centre For Hyperincursion
In social systems, meaning can be communicated in addition to underlying processes of the information exchange. Meaning processing incurs on information processing with hindsight, while information...
Scientometrics and the Evaluation of European Integration (2004)
Koen Frenken, Loet Leydesdorff
A fascinating facet of the European Union is the multiplicity of meanings that are generated with respect to European integration. Different perceptions among Europeans contest the meaning of...
Via the Internet, information scientists can obtain cost-free access to large databases in the “hidden ” or “deep web. ” These databases are often structured far more than the Internet...
Networks of communication evolve in terms of reflexive exchanges. The codification of these reflections in language, that is, at the social level, can be considered as the operating system of...
'Interaction' versus 'action' in Luhmann’s sociology of communication (2003)
Both ‘actions’ and ‘interactions’ can be considered as micro-operations that can be aggregated from a systemic perspective. Whereas actions operate historically, interactions provide the...
Both “actions ” and “interactions ” are micro-operations that can be aggregated from a system’s perspective. Whereas “actions ” operate historically, “interactions ” provide the...
The Construction and Globalization of the Knowledge Base in Inter-Human Communication Systems (2003)
The relationship between the “knowledge base ” and the “globalization ” of communication systems is discussed from the perspective of communication theory. I argue that inter-human...
University-industry-government relations provide a networked infrastructure for knowledge-based innovation systems. This infrastructure organizes the dynamic fluxes locally and the knowledge base...
Can change in citation patterns among journals be used as an indicator of structural change in the organization of the sciences? Aggregated journal-journal citations for 1999 are compared with...
The Communication Turn in the Theory of Social Systems (2002)
The theory of social systems has been contested as a part of sociology. Social order can be expected to emerge as an expectation that is communicated. A communication can be provided with meaning and...
Evaluation criteria can be expected to differ with the institutional perspectives in university-industry-government relations. How can one use evaluation for the improvement of the innovative...
Technology Transfer in European Regions: Introduction to the Theme Issue s (2002)
Leydesdorff, Loet, Cooke, Philip, Olarazan, Mikel
Regions can be considered as "regional innovation systems," but the question of whether and to what extent technology transfer is taking place at this or other (e.g., national and global) levels...
The Globalization of an Author (2002)
Cybermetric methodologies can be expected to reveal dimensions of communication other than those shown by scientometric operationalizations. In a previous study entitled “The organization of the...
Loet Leydesdorff, Gaston Heimeriks (l, H Argue
1294.) argue that biotechnology develops in a self-organizational mode, through interaction between the intellectual structure and the institutional network of the research field. This claim is...
Dynamic and Evolutionary Updates of Classificatory Schemes in Scientific Journal Structures (2002)
Index be used for the indication of structural change in the database, and how can this change be compared with reorganizations of relations among previously included journals? Change in the number...
Technology and Culture: the Dissemination and the Potential 'Lock-In' of New Technologies (2001)
How do technological innovations change the patterns of their cultural diffusion in socio-economic networks? Cellular automata enable us to show Arthur's (1988) model of a potential 'lock-in' of a...
The Self-Organization of the European Information Society: The case of "biotechnology" (2001)
Leydesdorff, Loet, Heimeriks, Gaston
Fields of techno-science like biotechnology develop in a network mode: disciplinary insights from different backgrounds are recombined and university-industry relations are continuously reshaped. The...
Technology and Culture: The Dissemination and the Potential 'Lock-in' of New Technologies (2001)
How do technological innovations change the patterns of their cultural diffusion in socio-economic networks? Cellular automata enable us to show Arthur's (1988) model of a potential 'lock-in' of a...
The (neo-)evolutionary model of a Triple Helix of University-Industry-Government Relations focuses on the overlay of expectations, communications, and interactions that potentially feed back on the...
University-Industry-Government Relations in China: An emergent national system of innovations (2001)
Leydesdorff, Loet, Guoping, Zeng
Since 1992, a new Chinese innovation system has been emerging in terms of university-industry-government relations. In recent years, science parks, incubators, and high-tech development zones have...
Why Catalonia cannot be considered as a Regional Innovation System (2001)
Riba, Marta, Leydesdorff, Loet
We present a model to assess the systemness of an innovation system. Patent and citation data with an institutional address in Catalonia (1986-1996) were analyzed in terms of relational linkages and...
Indicators of Innovation in a Knowledge-based Economy (2001)
The concept of ‘modes of knowledge production’ was used by Gibbons et al. (1994)[1] to distinguish between transdisciplinary (‘Mode 2’) R&D and more traditional (‘Mode 1’) research. This...
The Transformation Of University-industry-government Relations (2001)
Leydesdorff, Loet, Etzkowitz, Henry
A transformation in the functions of university, industry, and government, the “triple helix,” is taking place as each institution can increasingly assume the role of the other. The Triple Helix...
The quantitative study of scientific communication challenges science and technology studies by demonstrating that organized knowledge production and control is amenable to measurement. First, the...
Indicators of Innovation in a Knowledge-based Economy (2001)
The concept of 'modes of knowledge production' was used by Gibbons et al. (1994) [1] to distinguish between transdisciplinary ('Mode 2') R&D and more traditional ('Mode 1') research. This paper...
Indicators of Innovation in a Knowledge-based Economy (2001)
The concept of 'modes of knowledge production' was used by Gibbons et al. (1994) [1] to distinguish between transdisciplinary ('Mode 2') R&D and more traditional ('Mode 1') research. This paper...
Etzkowitz, Henry (ed.), Leydesdorff, Loet (ed.)
0-8264-5673-1
Leydesdorff, Loet, Curran, Michael
University-industry-government relations can be indicated by using advanced search engines on the Internet. This methodology provides us with opportunities to construct time series, compare among...
Curran, Michael, Leydesdorff, Loet
University-industry-government relations can be indicated by using advanced search engines on the Internet. This methodology provides us with opportunities to construct time series, compare among...
Luhmann, Habermas, and the Theory of Communication (1999)
In his critique of Luhmann's sociology, Habermas (1987) argued that individuation and socialization are possible on the basis of linguistic structures. This critique touches the blind spot of...
La nueva reorganización de las relaciones institucionales entre universidades, investigación industrial y laboratorios gubernamentales es una consecuencia de los cambios habidos en las estructuras...
Is the European Monetary System Converging to Integration (1999)
Loet Leydesdorff, Nienke A. Oomes
So much of barbarism... still remains in the transactions of most civilised nations, that almost all independent countries choose to assert their nationality by having, to their own inconvenience and...
The European Guide to Science, Technology, and Innovation Studies (1998)
Wouters, Paul, Annerstedt, Jan, Leydesdorff, Loet
This is the first European guide to science, technology, and innovation (STI) studies. It aims to facilitate public access to these relatively young specialties of academic and strategic research....
The production of probabilistic entropy in structure/action contingency relations (1995)
Luhmann (1984) defined society as a communication system which is structurally coupled to, but not an aggregate of, human action systems. The communication system is then considered as...
“While a Storm is Raging on the Open Sea”: Regional Development in a Knowledge-based Economy
The Triple Helix of university–industry–government (UIG) relations is elaborated into a systemic model that accounts for interactions among three dimensions. By distinguishing between the...
Regional Development in the Knowledge-Based Economy: The Construction of Advantage
Philip Cooke, Loet Leydesdorff
In this introduction the editors showcase the papers by way of a structured project and seek to clarify the two key concepts cited in the title. We consider the history of the idea that knowledge is...
Technology and Culture: the Dissemination and the Potential 'Lock-In' of New Technologies
How do technological innovations change the patterns of their cultural diffusion in socio-economic networks? Cellular automata enable us to show Arthur's (1988) model of a potential 'lock-in' of a...
Evaluation criteria can be expected to differ with the institutional perspectives in university-industry-government relations. How can one use evaluation for the improvement of the innovative...
Technology Transfer in European Regions: Introduction to the Special Issue.
Leydesdorff, Loet, Cooke, Philip, Olazaran, Mikel
Regions can be considered as "regional innovation systems," but the question of whether and to what extent technology transfer is taking place at this or other (e.g., national and global) levels...
Meaning can be communicated in addition to—and on top of—underlying processes of the information exchange. Meaning is provided to observations from the perspective of hindsight, while information...