We present VOSviewer, a freely available computer program that we have developed for constructing and viewing bibliometric maps. Unlike most computer programs that are used for bibliometric mapping, VOSviewer pays special attention to the graphical representation of bibliometric maps. The functionality of VOSviewer is especially useful for displaying large bibliometric maps in an easy-to-interpret way. The paper consists of three parts. In the first part, an overview of VOSviewer’s functionality for displaying bibliometric maps is provided. In the second part, the technical implementation of specific parts of the program is discussed. Finally, in the third part, VOSviewer’s ability to handle large maps is demonstrated by using the program to construct and display a co-citation map of 5,000 major scientific journals.

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Software survey: VOSviewer, a computer program for bibliometric mapping.

2 1 The innovative transport systems and the CityMobil project 10 1.1 The research questions 10 2 The state of art in the field of automatic transport systems 12 2.1 Case studies and demand studies for innovative transport systems 12 3 The design and implementation of surveys 14 3.1 Definition of experimental design 14 3.2 Questionnaire design and delivery 16 3.3 First analyses on the collected sample 18 4 Calibration of Logit Multionomial demand models 21 4.1 Methodology 21 4.2 Calibration of the “full” model. 22 4.3 Calibration of the “final” model 24 4.4 The demand analysis through the final Multinomial Logit model 25 5 The analysis of interaction between the demand and socioeconomic attributes 31 5.1 Methodology 31 5.2 Application of Mixed Logit models to the demand 31 5.3 Analysis of the interactions between demand and socioeconomic attributes through Mixed Logit models 32 5.4 Mixed Logit model and interaction between age and the demand for the CTS 38 5.5 Demand analysis with Mixed Logit model 39 6 Final analyses and conclusions 45 6.1 Comparison between the results of the analyses 45 6.2 Conclusions 48 6.3 Answers to the research questions and future developments 52

The European commission

Social Network Analysis

We review the recent rapid progress in the statistical physics of evolving networks. Interest has focused mainly on the structural properties of complex networks in communications, biology, social sciences and economics. A number of giant artificial networks of this kind have recently been created, which opens a wide field for the study of their topology, evolution, and the complex processes which occur in them. Such networks possess a rich set of scaling properties. A number of them are scale-free and show striking resilience against random breakdowns. In spite of the large sizes of these networks, the distances between most of their vertices are short - a feature known as the 'small-world' effect. We discuss how growing networks self-organize into scale-free structures, and investigate the role of the mechanism of preferential linking. We consider the topological and structural properties of evolving networks, and percolation and disease spread on these networks. We present a number of models demonstrat...

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Evolution of networks

The Study of Man. By Michael Polanyi. Price, $1.75. Pp. 102. University of Chicago Press, 5750 Ellis Ave., Chicago 37, 1959. One subtitle to Polanyi's challenging and fascinating book might be The Evolution and Natural History of Error , for Polanyi is at pains to expunge what he believes to be the false notion contained in the contemporary view of science which treats it as an object and basically impersonal discipline. According to Polanyi not only is this a radical and important error, but it is harmful to the objectives of science itself. Another subtitle could be Farewell to Detachment , for in place of cold objectivity he develops the idea that science is necessarily intensely personal. It is a human endeavor and human point of view which cannot be divorced from nor uprooted out of the human matrix from which it arises and in which it works. For a good while

Personal Knowledge: Towards a Post-Critical Philosophy

Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query Following D M Everett and S C Cater (1992), we introduce topologies on the document space These topologies are generated by the similarity function sim and the query space QS Three topologies will be studied: The retrieval topology, the similarity topology, and the (pseudo-)metric one It is shown that the retrieval topology is the coarsest of the three, while the (pseudo-) metric is the strongest These three topologies are generally different, reflecting distinct topological aspects of information retrieval We present necessary and sufficient conditions for these topological aspects to be equal Several examples of topological retrieval systems are presented One of these examples is a vector space model that yields a simplification of the Everett-Cater model, yet having a more diversified spectrum of topological properties Finally, it is shown that information retrieval based on Boolean operators is an intrinsic part of the general topological model This is a major motivation of the introduction of topologies in theoretical IR models

/pdf/topological-aspects-of-information-retrieval-1k69jy4k2m.pdf

Topological aspects of information retrieval

In this article we provide a scientometric comparison between two health and population research organizations, namely the International Centre for Diarrhoeal Disease Research in Bangladesh (ICDDR,B) and the National Institute of Cholera and Enteric Diseases (NICED) in India, during the period 1979-2008. We study these two institutes because they conduct similar research and because of their collaboration ties. Data are collected from the Web of Science (WoS) as well as from official records of these two organizations. The analysis presents the evolution of publication activities. Special attention is given to research impact through time series of the institutional h- and R-indices, as well as to the trend in yearly citations received. Types of publications, international collaboration with other countries, top scientists and most cited articles co-authored by scientists from these institutions are highlighted. It is observed that female scientists play a minor role in these two institutes.

A scientometric analysis of health and population research in south asia: focus on two research organizations

Introduction Part 1: Information about the library 1.1 Reports 1.2 Data gathering 1.3Data gathering in an electronic environment 1.4 Complete and incomplete data 1.5 How to sample 1.5.1 Random sampling 1.5.2 Systematic sampling 1.5.3 The Fussler sampling method 1.5.4 Structural sampling 1.6 What to sample 1.6.1 Collection 1.6.2 User Services 1.6.3 Automation and catalogue aspects 1.6.4 The personal 1.6.5 External relations 1.6.6 Budgets 1.6.7 Data on companies involved in the library's activities 1.7 Measuring scales 1.7.1 Normal scale 1.7.2 Rank order scale 1.7.3 Interval scale 1.7.4 Difference and ratio scales 1.7.5 Absolute scale Part 2: Descriptive statistics 2.1 Graphical aspects of data 2.1.1 Mathematical functions 2.1.2 Graphical representation of data 2.1.3 Problems with graphical representation 2.1.4 Scatterplots and regression lines 2.2 Measuring central tendencies and irregularity of data 2.2.1 The mean of average 2.2.2 The variance and the standard deviation 2.2.3 Median, quartile, percentile 2.2.4 Applications: box-whisker plots, 80/20 rule, Lorenz curves 2.2.5 Calculation of the equation of the regression line Part 3: Inferential statistics 3.1 Goal of part 3 3.2 First test for the mean: one sample and one set of measurements 3.3 Consequence of the first test of the mean: confidence intervals for the population mean 3.4 Second test for the mean: one sample but with two sets of measurements 3.5Third test for the mean: two samples 3.6 Sample sizes 3.6.1 Rough Argument 3.6.2 Logical correction and refinement 3.7Confidence intervals and sample sizes for multinomial fractions 3.7.1 Introduction 3.7.2 The correct method for determining multinomial confidence intervals 3.7.3 Sample sizes for multinomial confidence intervals 3.8 Epilogue: test for the quality of regression line of a scatterplot - the correlation coefficient Conclusion Appendix 1. Table of random number Appendix 2. Logic of calculations Appendix 3. Basic arithmetic on pocket calculators Appendix 4. List of notation Bibliography Subject Index

Elementary Statistics for Effective Library and Information Service Management

http://or.nsfc.gov.cn/bitstream/00001903-5/358383/1/1000014862810.pdf

Using multi-level frontiers in DEA models to grade countries/territories

Using citation data of articles written by some Nobel Prize winners in physics, we show that concave, convex, and straight curves represent different types of interactions between old ideas and new insights. These cases illustrate different diffusion characteristics of academic knowledge, depending on the nature of the knowledge in the new publications. This work adds to the study of the development of science and links this development to citation analysis.

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Ronald Rousseau

Papers

Topological aspects of information retrieval

A scientometric analysis of health and population research in south asia: focus on two research organizations

Elementary Statistics for Effective Library and Information Service Management

Using multi-level frontiers in DEA models to grade countries/territories

Citation analysis and the development of science: A case study using articles by some Nobel prize winners