Modeling public mood and emotion: Twitter sentiment and socio-economic phenomena (2009)
Bollen, Johan, Pepe, Alberto, Mao, Huina
Microblogging is a form of online communication by which users broadcast brief text updates, also known as tweets, to the public or a selected circle of contacts. A variegated mosaic of microblogging...
A principal component analysis of 39 scientific impact measures (2009)
Bollen, Johan, Van De Sompel, Herbert, Hagberg, Aric, Chute, Ryan
The impact of scientific publications has traditionally been expressed in terms of citation counts. However, scientific activity has moved online over the past decade. To better capture scientific...
General Terms Algorithms (2009)
We describe a DL multimedia recommender system implemented for the Open Video project. Recommendations are generated by a spreading activation algorithm operating on a video network created from log...
Xiaoming Liu, Johan Bollen, Michael L. Nelson
Visualization eases insight into complex systems such as coauthorship networks. We present an initial deployment of an author navigator application for convenient visual examination of JCDL and LANL...
Automatic Metadata Generation using Associative Networks (2008)
Rodriguez, Marko A., Bollen, Johan, Van De Sompel, Herbert
In spite of its tremendous value, metadata is generally sparse and incomplete, thereby hampering the effectiveness of digital information services. Many of the existing mechanisms for the automated...
Towards Usage-based Impact Metrics: - First Results from the MESUR Project (2008)
Bollen, Johan, Van De Sompel, Herbert, Rodriguez, Marko A.
Scholarly usage data holds the potential to be used as a tool to study the dynamics of scholarship in real time, and to form the basis for the definition of novel metrics of scholarly impact....
specialinteres t Impact Factor Page Rankled (2008)
C. Hascall, Johan Bollen, W. Hanson, Albert Einstein
“Everything in life should be as simple as possible, but no simpler.”
Mining and Analyzing Digital Archive Usage Data to Support Collection Development Decisions (2008)
Jewel Ward, Johan Bollen, Jeffrey Pearson, Shing-cheung Chan, Hui-hsien Chi, Marie Chi, ...
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A distributed model for tacit design knowledge exchange (2008)
Ann Heylighen, Francis Heylighen, Johan Bollen, Mathias Casaer
Abstract. The distributed cognition approach, and by extension the domain of social intelligence design, attempts to integrate three until recently separate realms: mind, society, and matter. The...
Automatic Metadata Generation using Associative Networks (2008)
Marko A. Rodriguez, Johan Bollen, Herbert Van, De Sompel
In spite of its tremendous value, metadata is generally sparse and incomplete, thereby hampering the effectiveness of digital information services. Many of the existing mechanisms for the automated...
UNCONSCIOUS CONTRIBUTIONS Applying a connectionist model to design knowledge exchange (2008)
Ann Heylighen, Francis Heylighen, Johan Bollen, Mathias Casaer
The distributed cognition approach, and by extension the domain of social intelligence design, attempts to integrate three until recently separate realms: mind, society, and matter. The field offers...
Research: Recommendation systems for federated digital library Systems, bibliometric analysis of document networks, HCI models of hypertext navigation.
Marko A. Rodriguez, Johan Bollen, Herbert Van Sompel
This poster will present an analysis of the bid behavior of the 2005 JCDL program committee (Sumner, 2005). For each paper, poster, and tutorial submitted for review to the 2005 JCDL, each program...
Michael L. Nelson, Johan Bollen
We present the user evaluation of two recommendation server
Johan Bollen, Marko A. Rodriguez
Scholarly entities, such as articles, journals, authors and institutions, are now mostly ranked according to expert opinion and citation data. The Andrew W. Mellon Foundation funded MESUR project at...
If You Harvest arXiv.org, Will They Come? (2008)
Ichael Nelson Johanbollen, Michael L. Nelson, Johan Bollen
We examine which NASA Technical Report Server (NTRS) repositories have received the most downloads during 15 months of operation. In particular, we explore the collection development policy of...
Between conjecture and memento: shaping a collective emotional perception of the future (2008)
Large scale surveys of public mood are costly and often impractical to perform. However, the web is awash with material indicative of public mood such as blogs, emails, and web queries. Inexpensive...
Using RDF to Model the Structure and Process of Systems (2007)
Rodriguez, Marko A., Watkins, Jennifer H., Bollen, Johan, Gershenson, Carlos
Many systems can be described in terms of networks of discrete elements and their various relationships to one another. A semantic network, or multi-relational network, is a directed labeled graph...
Modeling Computations in a Semantic Network (2007)
Rodriguez, Marko A., Bollen, Johan
Semantic network research has seen a resurgence from its early history in the cognitive sciences with the inception of the Semantic Web initiative. The Semantic Web effort has brought forth an array...
Marko A. Rodriguez, Daniel J. Steinbock, Jennifer H. Watkins, Carlos Gershenson, Johan Bollen, Victor Grey, ...
Abstract — Smartocracy is a social software system for collective decision making. The system is composed of a social network that links individuals to those they trust to make good decisions and a...
Using RDF to model the structure and process of systems (2007)
Marko A. Rodriguez, Jennifer H. Watkins, Johan Bollen, Carlos Gershenson
Many systems can be described in terms of networks of discrete elements and their various relationships to one another. A semantic network, or multi-relational network, is a directed labeled graph...
Marko A. Rodriguez, Daniel J. Steinbock, Jennifer H. Watkins, Carlos Gershenson, Johan Bollen, Victor Grey, ...
Smartocracy is a social software system for collective decision making. The system is composed of a social network that links individuals to those they trust to make good decisions and a decision...
Mapping the Bid Behavior of Conference Referees (2007)
Marko A. Rodriguez, Johan Bollen
The peer-review process, in its present form, has been repeatedly criticized. Of the many critiques ranging from publication delays to referee bias, this paper will focus specifically on the issue of...
Using RDF to model the structure and process of systems (2007)
Marko A. Rodriguez, Jennifer H. Watkins, Johan Bollen, Carlos Gershenson
Many systems can be described in terms of networks of discrete elements and their various relationships to one another. A semantic network, or multi-relational network, is a directed labeled graph...
Usage Impact Factor: the effects of sample characteristics on usage-based impact metrics (2006)
Bollen, Johan, Van De Sompel, Herbert
There exist ample demonstrations that indicators of scholarly impact analogous to the citation-based ISI Impact Factor can be derived from usage data. However, contrary to the ISI IF which is based...
Mapping the Bid Behavior of Conference Referees (2006)
Rodriguez, Marko A., Bollen, Johan, Van De Sompel, Herbert
The peer-review process, in its present form, has been repeatedly criticized. Of the many critiques ranging from publication delays to referee bias, this paper will focus specifically on the issue of...
An Algorithm to Determine Peer-Reviewers (2006)
Rodriguez, Marko A., Bollen, Johan
The peer-review process is the most widely accepted certification mechanism for officially accepting the written results of researchers within the scientific community. An essential component of...
An Architecture for the Aggregation and Analysis of Scholarly Usage Data (2006)
Bollen, Johan, Van De Sompel, Herbert
Although recording of usage data is common in scholarly information services, its exploitation for the creation of value-added services remains limited due to concerns regarding, among others, user...
Simulating Network Influence Algorithms Using Particle-Swarms: PageRank and PageRank-Priors (2006)
Rodriguez, Marko A., Bollen, Johan
A particle-swarm is a set of indivisible processing elements that traverse a network in order to perform a distributed function. This paper will describe a particular implementation of a...
Bollen, Johan, Rodriguez, Marko A., Van De Sompel, Herbert
The status of an actor in a social context is commonly defined in terms of two factors: the total number of endorsements the actor receives from other actors and the prestige of the endorsing actors....
Scholarly Impact: from Ranking to Assessment. (2006)
Johan Bollen, W. Mellon Foundation, Herbert Van, Sompel Journal, Marko A. Rodriguez, J. Bollen, ...
Scholarly evaluation matters. Zero-sum resources require proper allocation: • Appointment decisions • Funding decisions • Monitoring trends and identify emerging focii • Prioritize activities...
Reconstructing Websites for the Lazy Webmaster (2005)
McCown, Frank, Smith, Joan A., Nelson, Michael L., Bollen, Johan
Backup or preservation of websites is often not considered until after a catastrophic event has occurred. In the face of complete website loss, "lazy" webmasters or concerned third parties may be...
The Availability and Persistence of Web References in D-Lib Magazine (2005)
McCown, Frank, Chan, Sheffan, Nelson, Michael L., Bollen, Johan
We explore the availability and persistence of URLs cited in articles published in D-Lib Magazine. We extracted 4387 unique URLs referenced in 453 articles published from July 1995 to August 2004....
The Convergence of Digital-Libraries and the Peer-Review Process (2005)
Rodriguez, Marko A., Bollen, Johan, Van De Sompel, Herbert
Pre-print repositories have seen a significant increase in use over the past fifteen years across multiple research domains. Researchers are beginning to develop applications capable of using these...
Toward alternative metrics of journal impact: A comparison of download and citation data (2005)
Bollen, Johan, Van De Sompel, Herbert, Smith, Joan, Luce, Rick
We generated networks of journal relationships from citation and download data, and determined journal impact rankings from these networks using a set of social network centrality metrics. The...
Co-Authorship Networks in the Digital Library Research Community (2005)
Liu, Xiaoming, Bollen, Johan, Nelson, Michael L., Van De Sompel, Herbert
The field of digital libraries (DLs) coalesced in 1994: the first digital library conferences were held that year, awareness of the World Wide Web was accelerating, and the National Science...
Bollen, Johan, Van De Sompel, Herbert
The wide-spread implementation of institutional repositories (IR), digital libraries, preprint services, and open access journals has dramatically changed the communication options that are available...
Bollen, Johan, Van De Sompel, Herbert
The wide-spread implementation of institutional repositories (IR), digital libraries, preprint services, and open access journals has dramatically changed the communication options that are available...
Toward Alternative Metrics of Journal Impact: A Comparison of Download and Citation Data (2005)
Johan Bollen, Joan A. Smith, Rick Luce
comparison of download and citation data.
Evaluation of the NSDL and Google for Obtaining Pedagogical Resources (2005)
Frank Mccown, Johan Bollen, Michael L. Nelson
We describe an experiment that measures the pedagogical usefulness of the results returned by the National Science Digital Library (NSDL) and Google. Eleven public school teachers from the state of...
Distributed, Real-Time Computation of Community Preferences (2005)
Thomas Lutkenhouse, Michael L. Nelson, Johan Bollen
We describe the integration of smart digital objects with Hebbian learning to create a distributed, real-time, scalable approach to adapting to a community's preferences. We designed an...
Evaluation of the NSDL and Google for (2005)
Obtaining Pedagogical Resources, Frank Mccown, Johan Bollen, Michael L. Nelson
We describe an experiment that measures the pedagogical usefulness of the results returned by the National Science Digital Library (NSDL) and Google. Eleven public school teachers from the state of...
The availability and persistence of web references in D-Lib Magazine (2005)
Frank Mccown, Sheffan Chan, Michael L. Nelson, Johan Bollen
Abstract. We explore the availability and persistence of URLs cited in articles published in D-Lib Magazine. We extracted 4387 unique URLs referenced in 453 articles published from July 1995 to...
The convergence of digital libraries and (2005)
Marko A. Rodriguez, Johan Bollen
the peer-review process
Marko A. Rodriguez, Johan Bollen, Marko A. Rodriguez, Johan Bollen
The convergence of digital libraries and the peer-review process
Dynamic Linking of Smart Digital Objects Based on User Navigation Patterns (2004)
Elango, Aravind, Bollen, Johan, Nelson, Michael L.
We discuss a methodology to dynamically generate links among digital objects by means of an unsupervised learning mechanism which analyzes user link traversal patterns. We performed an experiment...
Harrison, Terry L., Elango, Aravind, Bollen, Johan, Nelson, Michael
The proliferation of the Open Archive Initiative Protocol for Metadata Harvesting (OAI-PMH) has resulted in the creation of a large number of service providers, all harvesting from either data...
Hebbian Algorithms for a Digital Library Recommendation System (2002)
Francis Heylighen, Johan Bollen
This paper proposes a set of algorithms to extract metadata about the documents in a digital library from the way these documents are used. Inspired by the learning of connections in the brain, the...
A personalization service for digital library environments (2001)
Mariella Di Giacomo, Dan Mahoney, Johan Bollen, Andres Monroy-hern
Several initiatives have offered personalized electronic services for digital library users. However, most of these services do not provide users with personalized shared Web environment, recommender...
Biologically Motivated Distributed Designs for Adaptive Knowledge Management (2000)
We discuss how distributed designs that draw from biological network metaphors can largely improve the current state of information retrieval and knowledge management of distributed information...
Biologically Motivated Distributed Design for Adaptive Knowledge Management (2000)
Luis Rocha, Luis Mateus Rocha, Johan Bollen
this article in addition to DIS are: IR (Information Retrieval), SA
Biologically Motivated Distributed Designs for Adaptive Knowledge Management (2000)
Luis M. Rocha, Luis M, Luis Mateus Rocha, Johan Bollen, Johan Bollen
We discuss how distributed designs that draw from biological network metaphors can largely improve the current state of information retrieval and knowledge management of distributed information...
Johan Bollen, Herbert Vandesompel, Luis M. Rocha
We have devized a methodology that mines sequential navigation patterns from a website's logs to enable us to identify the most signicant associative links in the networks. Spreading activation...
A System to Restructure Hypertext Networks Into Valid User Models (1998)
Johan Bollen, Francis Heylighen, Leo Apostel
Introduction. 1.1. Information retrieval in the WWW. T he Internet and its associated WWW (World Wide Web) hypertext protocol have been experiencing an exponential growth during the past few years....
Johan Bollen, Francis Heylighen
Abstract In spite of these similarities, the WWW lacks some The World Wide Web has a number of striking similarities with other learning networks (natural or artificial). Its structure is that of a...
The World-Wide Web as a Super-Brain: from metaphor to model (1996)
Francis Heylighen, Johan Bollen
Abstract ticular has been characterized by the explosive develop-If society is viewed as a super-organism, communication networks play the role of its brain. This metaphor is developed into a model...