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This article introduces a number of methods that can be useful for examining the emergence of large-scale structures in collaboration networks. The study contributes to sociological research by investigating how clusters of research collaborators evolve and sometimes percolate in a collaboration network. Typically, we find that in our networks, one cluster among the leading ones eventually wins the growth race by percolating through the network, spanning it and rapidly filling up a significant volume of it. We show how this process is governed by the dynamics of cluster growth in the network. When operating in a percolating regime, this class of networks possesses many useful functional properties, which have important sociological implications. We first develop the methodological tools to perform a study of the intrinsic clustering process. Then, to understand the actual large-scale structure formation process in the network, we apply the theoretical methods to simulate a number of realistic scenarios, including one based on actual data on the collaboration behavior of a sample of researchers. From the perspective of social science research, our methods can be adapted to suit the application domains of many other types of real social processes.

The study analyses the Indian publications output in glaucoma research during 2002-11 on different parameters including contribution & citation impact of top most productive countries, India's overall contribution, its growth pattern and citation impact, the share of international collaboration in India's overall research output, contribution of leading countries and identification of leading foreign collaborating partners, Indian contribution & impact of different types of glaucoma, glaucoma research by sub-fields and glaucoma research output by different population age groups, productivity and impact of leading Indian institutions and authors and pattern of communication of Indian output in most productive journals. The Scopus citation database has been used to retrieve the data for 10 years (2002-11) by searching the keywords 'glaucoma or intraocular pressure' in combined Title, Abstract and Keywords field. The Indian publications output in glaucoma research (1078 papers) during 2002-11 increased from 61 papers in 2002 to 207 papers in 2011, witnessing an annual average growth rate of 18.29 %. The average citation impact per paper registered by Indian publications in glaucoma research was 3.03 during 2002-11, which decreased from 3.87 during 2002-06 to 2.49 during 2007-11. The international collaborative share of India in overall glaucoma research was 21.06 % during 2002-11, which increased from 17.92 % during 2002-06 to 23.09 % during 2007-11. The glaucoma's irreversibility, lacking of glaucoma specialists and patients unawareness demand for an economic and effective glaucoma diagnosis system for screening. Disease control and elimination require an adequately trained functional workforce with an enabling infrastructure and technology. The authors suggest that research efforts needs to be strengthened quiet substantially by way of investment in R&D. Both research output and quality of research should be increased and strengthened and international collaborative research may further be widened to learn from the experiences of other countries. [ABSTRACT FROM AUTHOR]