Visits Abroad



  1. Western Michigan University, Kalamazoo, USA. Attended the Ninth Quadrennial International conference on Graph Theory, Combinatorics, Algorithms and Applications, June 4-9, 2000. Gave a talk on A Generalisation of Edge Chromatic number using acyclic graphoidal covers.
  2. Visited the University of Milwakee, USA and had interaction with Rev. Fr. Albert William during June 11-12, 2000.
  3. Visited Academy of Tamil Arts and Technology, Scarborough, Canada, August 26, 2002 to September 8, 2002 for conducting the semester examination for B.A (Tamil) Degree, conducted by Manonmaniam Sundaranar University in Collaboration with the Academy.
  4. Visited Carleton University, Ottawa, Canada during September 10-13, 2002. Gave a research seminar on Asteroidal Chromatic number of a graph on September 12, 2002, Had interaction with Dr. Brett Stevens.
  5. Visited the Department of Computer Science, University of Toronto, Toronto, Canada on September 20, 2002. Attended two research seminars; Interacted with Prof. D.G. Corneil.
  6. Visited the Department of Mathematics, University of Waterloo, Canada during September 23-24, 2002. Had discussions with Prof. PL. Kannappan, Prof. H. Younger and Prof. U S R Murthy.
  7. Visited University of Exeter, Exeter, UK during September 30, October 1 and October 4 to 7, 2002. Had discussions with Dr. R.P. Burn.
  8. Visited the Department of Mathematics, University of Nottingham, Nottingham UK during October 2-3, 2002. Interacted with Prof. Douglas R. Woodall; Gave a Research Seminar on Asteroidal sets and Asteroidal Chromatic Number of a Graph.
  9. Visited University of Queensland, Brisbane, Australia, Attended the 30th Australasian Conference on Combinatorial Mathematics and Combinatorial Computing, December 5-9, 2005 and gave a talk on Simple Path Covers in a Graph
  10. Visited the Institute of Mathematical Sciences, University of Malaya, Kula Lumpur during December 10 -13, 2005 and gave two invited talks on Simple Path Covers in a Graph and Domination Related Functions in Graphs on December 12, 2005.
  11. Visited Texas A&M University, USA and had interaction with Prof. Suresh D. Pillai, during September 16-17, 2007.
  12. Visited University of Oklahoma, USA and had interaction with Prof. Krishnaiyan Thulasiraman, during September 17-19, 2007.
  13. Visited East Tennessee State University, Tennessee, USA and had interaction with Prof. T.W. Haynes, during September 19-22, 2007.
  14. Visited Ball State University, USA and had interaction with Prof. Jay Bagga, during September 23-25, 2007.
  15. Visited Rochester Institute of Technology, Rochester, New York and had interaction with Prof. Robert D. Borden, during September 25-26, 2007.
  16. Visited Royal Holloway University of London and had interaction with Prof. Peter Wild, during September 27-29, 2007.
  17. Visited National University of Singapore during January 2-5, 2008 and gave an invited talk on Domination Chain and fractional Parameters and had interaction with Prof. K.M. Koh.
  18. Visited Harbin Engineering University, Harbin, China: Attended the 4th International Workshop on Graph Labelings , January 6-10, 2008 and gave an invited talk on Graph Labeings and Embedding Problems.
  19. Visited Charles University, Prague, Czech Republic during June 22-24, 2009, interacted with Prof. Jan Kratochril and delivered guest lecture on Fractional Coloring and Fractional Domination in Graphs
  20. Visited V.S.B. Technical University of Ostrava, Ostrava, Czech Republic during June 25-27, 2009, interacted with Prof. Dalibor Froncek, Petr. Kovar and M. Kuberha and delivered guest lecture on MAX-MIN and MIN-MAX Graph Saturation parameters.
  21. Participated in the 20th International Workshop on Combinatorial Algorithms (IWOCA 2009) at Hradec Nad Moravici, Czech Republic during June 28- July 2, 2009 and gave a talk on Equitable Domination in Graphs. He has also submitted the proposal for organizing this workshop at Kalasalingam University in 2012.
  22. Participated in the 22nd British Combinatorial Conference (BCC 2009) at University of St. Andrews, St. Andrews, Scotland, UK during July 5-10, 2009 and delivered a talk on Maximal Independent sets in Minimum Colorings.
  23. Participated in the India-Taiwan Conference on Discrete Mathematics at National Taiwan University, Taipei , Taiwan during November 9-12, 2009 and delivered a talk on Component-Complete Sets in Graphs.
  24. Participated in the International Workshop on Combinatorial Algorithms (IWOCA 2010) at King's College, London during July 26-28, 2010 and gave a presentation about IWOCA 2012 to be organized at Kalasalingam University.
  25. Visited Liverpool Hope University, Liverpool, UK during July 29-30, 2010 interacted with Prof. Atulya Nagar regarding research collaboration and delivered a talk on Applications of Graph Theory to Visual Cryptography.
  26. Participated in the in the Workshop on Cycles and Colourings 2010 at High Tatras, Slovakia during September 05 - 10, 2010 and delivered an invited talk on The Cycle Spectrum of a Graph.
  27. Participated in the Sixth Cracow Conference on Graph Theory held at Zgorzelisko, Poland during September 12-17, 2010 and presented a paper entitled Dominator Colorings in Graphs.
  28. Visited Ball State University, USA during September 17-October 2, 2010, interacted with several professors in the department of computer science, mathematics and business school. Delivered several guest lecturers during this period.
  29. Visited Indiana University- Purdue University Fort Wayne (IPFW), USA on September 24, 2010, interacted with Prof. Lowel W. Beineke and delivered a talk on Distance Magic Graphs
  30. Visited Wright state University, Dayton, USA on October 1, 2010, interacted with Prof. K.T. Arasu and delivered a talk on Dominator Colorings in Graphs in the Department of Mathematics.
  31. Visited City College of New York, USA during October 4-6, 2010 interacted with Prof. K. Ravindran, Prof. S. Burr, Dr. Sergel N. Artemov and Dr. Ted Brown and delivered a talk on Applications of Graph Theory to Visual Cryptography.
  32. Visited Clemson University, Clemson, USA during October 7-9, 2010 and interacted with Prof. S.T. Hedetniemi, Prof. S.M. Hedetniemi, Prof. Wayne Goddard and Prof. Ranu Laskar. Delivered an Invited talk on Some New Research Directions in Domination in the 25th Clemson Mini-Conference on Discrete Mathematics and Algorithms.
  33. Visited East Tennessee State University, Johnson City, USA during October 11-14, 2010, interacted with Prof. T.W. Haynes and Prof. Yared Nigusse and delivered a talk on Distance Magic Graphs.
  34. Visited Texas State University, San Marcos, USA on October 15, 2010, interacted with Dr. Daniello Ferraro, Dr. Natheniel Dien and Dr. Jian Shen and delivered a talk on Fractional Metric Dimension of a graph.
  35. Visited University of Oklahoma, Norman during October 16-19 and had interaction with Prof.K. Thulasiraman and Prof. Lakshmi Varahan.
  36. Visited University of Minnesotta, Duluth, USA during October 20-22, 2010, interacted with Prof. Dalibor Froncek and Prof. Joseph Gallian. Delivered Keynote address on Distance Magic Labellings in Graphs in the Sixth International Workshop on Graph Labellings (IWOGL2010).
  37. Participated in the fiftieth Midwest Graph Theory Conference (MIGHTY L) at the University of Wisconsin-Superior, USA on October 23, 2010 and presented a paper on Dominator Colorings in Graphs.
  38. Visited Liverpool Hope University, Liverpool, UK during May 3 -25, 2011 under the project Centre for Applicable Mathematics and Systems Science (CAMSS) for research collaboration.
  39. Participated in the International Workshop on Combinatorial Algorithms (IWOCA 2011) at University of Victoria, Canada during June 18-26, 2011 and gave a presentation about IWOCA 2012 to be organized at Kalasalingam University. He also presented a paper entitled Algorithmic Aspects of Dominator Colorings and had interaction with Prof. Gary MacGillivray for future collaboration.
  40. Visited British University in Dubai on 14-11-2011 and delivered an Open Lecture on Visual Cryptography Scheme- A Brief Survey.
  41. Participated in the 7th International Workshop on Graph Labeling (IWOGL 2012) at University of Indonesia, Indonesia during July 23-25, 2012 and gave a talk on Distance Magic and Distance Antimagic Graphs.
  42. Participated in the International Workshop on Optimal Network Topologies (IWONT 2012) at Institut Teknologi Bandung (ITB), Bandung, Indonesia during July 27-29, 2012 and gave a talk on Dominator Sequences in Bipartite Graphs.
  43. Visited Liverpool Hope University, Liverpool, UK during 20th September -13th October, 2012 as a Visiting Professor and for research collaboration and delivered around 10 lectures to the undergraduate students of Liverpool Hope University on Foundations of Mathematics.
  44. Visited University of Leicester during September 27-29, 2012 and delivered an invited talk in the mini-symposium on Graph Theory held in the Department of Computer Science on 28th September 2012.
  45. Delivered an invited talk on Applications of Graph Theory to Social Networks in the research seminar programme of Liverpool Hope University on 10th October 2012.
  46. Visited the Caledonian Business School at Glasgow Caledonian University (GCU), London on 3rd October 2012 and had academic discussions with Dr. Sovan Mitra.
  47. Visited University of Salford, Manchester on 12th October 2012 and interacted with Prof. Terrence Fernando for possible research collaboration.
  48. Visited Universitas Gadjah Mada, Yogyakarta-Indonesia during November 6-7, 2013 and delivered a keynote address on Protection of Graphs in 2nd IndoMs International Conference on Mathematics and its Applications (IICMA 2013)
  49. Visited Department of Applied Mathematics, Tunghai University, Taichung Taiwan during November 16-17, 2013 and delivered three lectures in the workshop on Graph Theory and Interconnection Network. Interacted with Dr. Tao-Ming Wang for research collaboration.
  50. Visited Department of Applied Mathematics, National Chia Tung University, Hsinchu, Taiwan during November 19-22, 2013 and delivered an invited talk in the 3rd India-Taiwan Conference on Discrete Mathematics.
  51. Visited National Tsing Hua University, Hsinchu, Taiwan had a discussion with Prof. Da Hsuan Feng, Senior Vice President (Global Strategy, Planning and Evaluation) regarding the possibility of signing MoU on 20th November 2013.
  52. Visited Department of Mathematics, University Sains Malaysia, Malaysia during May 11-13, 2015 and delivered five Invited talk on "Domination in Graphs" in the Two-day Course on Graph Algorithms and its Industrial Applications - Tutorial and Case studies at Department of Mathematics, University Sains Malaysia, Malaysia during May 11-12, 2015. Also delivered keynote address on "Graph Coloring Problems" in the International Workshop on Graph Algorithms (IWGA 2015) at Department of Mathematics, University Sains Malaysia, Malaysia on 13th May 2015.
  53. Visited Yazd University, Iran during 25-28 August 2015 and delivered an Invited talk on "Biological Networks" in the in the 46th Annual Iranian Mathematics Conference (AIMC2015).
  54. Presented a Paper entitled "Applications of Signed Graphs to Portfolio Turnover Analysis" in the 2nd Global Conference on Business and Social Science held at ASTON Denpasar Hotel and Convention Centre Bali, Indonesia during Sep 17-18, 2015
  55. Visited Institut Teknologi Bandung, Indonesia during Sep 21-23, 2015 and delivered an invited talk on "Local Antimagic Chromatic Number of a Graph" in the International Conference on Graph Theory and Information Security.
  56. Visited Universitas Jember, Jember, East Java, Indonesia during Sep 25-26,2015 and delivered an invited talk on "Distance Magic Labelings in Graphs" in the Graph Master Workshop.
  57. Visited Hasanuddin University, Makassar, South Sulawesi, Indonesia during 28th Sep-6th Oct 2015 and delivered three invited talks on Labelings, Domination and Social Networks in the SEAMS School on Coding and Graphs. Also delivered an invited talk on "Ethics in Research Publications" in the Workshop for Writing Computer-science-related Articles In International publication on 29th Sep 2015.
  58. Visited Hasanuddin University, Makassar, South Sulawesi, Indonesia during 28th Sep-6th Oct 2015 and delivered an invited talk on "Visual Cryptography" in the International Conference on Mathematics, Statistics, Computer Science, Mathematics Education (ICMSCSME) on 2nd Oct 2015.
  59. Presented a Paper entitled "Personal Sharing in Small Groups-A Case Study" in the 3rd Global Conference on Business and Social Science held at Hotel Nexus, Kuala Lumpur during December 16-17, 2015.