Centre for Intelligent Systems and their Applications
School of Informatics
University of Edinburgh
2.02 Informatics Forum
10 Crichton Street
Edinburgh EH8 9AB, Scotland
E-mail: gaya.n [at] ed.ac.uk
Research  Teaching  Publications  Other
I am now an assistant professor at Sungkyunkwan University (SKKU).
I can still be reached at the email address above or at gaya [at] skku.edu
I teach data science courses and am enthusiastic in applying intelligent techniques on big data such as videos and more recently, medical data, in particular, drug-related data.
Current Research Interests: Biomedical Data Integration and Analysis, Predictive Maintenance, Computational Drug Repurposing, Graph Databases, Biomedical Ontologies.
Previous Research Interests: Automatic Workflow Composition, HTN Planning, Ontology Engineering, Job Scheduling and Monitoring, Process Modelling, Image Processing Tools.
- March 2019: Appointed Assistant Professor at SKKU (Data Science).
- July 2018: Guest lecture at ISS summer course in Data Science.
- November 2017: Appointed AI Consultant for Hibiscus Petroleum Berhad.
- April 2016: Our project book, Fish4Knowledge: Collecting and Analyzing Massive Coral Reef Fish Video Data is out now.
- March 2016: Appointed Senior Scientist at Standigm.
- Nov 2015: Co-chaired and presented at SEMBI Workshop, JIST 2015.
- Oct 2015: Invited talk at 2nd Korea-China Data Science Symposium, Daegu.
- Feb 2015: My opinions were featured in an article about diversity in the technology workforce.
I was a researcher with the Fish4Knowledge (F4K) project (2010-2013).
My roles included:
I obtained a Ph.D. in 2010 with my thesis Semantics and Planning Based Workflow Composition for Video Processing. I worked with Jessica Chen-Burger and Bob Fisher and continued to do so in F4K.
My research involved investigating methods to model generic vision tasks and to provide an automatic mechanism to allow users without image processing expertise to perform complex vision tasks. Here is a brief statement of my work:
- Designing a workflow component that binds high-level video processing queries to low-level image processing components.
- Designing project ontologies that represent the video processing goals, environmental conditions and software capabilities.
- Scheduling and monitoring workflow tasks according to their priorities, availability of resources and intensity of the video processing modules.
Much of video analyses are conducted manually. Automatic solutions are only possible with image processing expertise and access to specialised tools. Furthermore, each time a task is required to be done, image processing experts develop the applications from scratch and do not reuse existing modules that they have implemented previously due to the inherent difficulties in estimating the input, output and threshold values. Workflow systems, on the other hand, have several drawbacks including construction of workflows automatically. I propose a hybrid workflow composition approach that will enable the selection of image processing tools based on their performance levels automatically or semi-automatically (with user involvement). In order to achieve this ontologies are used to assist with semantic interoperability and planning to assist with performance-based selection. On a wider context, the solution I propose will enable image processing-naive users, such as domain experts to conduct complex video processing tasks. It would also provide a reasonable automatic solution for various video analyses that would take too long to perform manually. The use of semantics-based technologies would also enable this system to be integrated within a distributed environment, such as the Grid.
Read full proposal here. Slides.
I visited the National Center for High Performance Computing (NCHC), NARL, Taiwan in summer 2012 and spring 2013 to collaborate with HPC experts on accessing and managing their facilities for F4K.
I visited University of Catania, Italy between September and December 2008 to collaborate with image processing experts on modularisation methodologies.
I was involved with the OpenKnowledge project in 2008 and the SynProc project in 2009-10.
My current and past collaborators include Dave Robertson, Omer Rana (Cardiff), Concetto Spampinato (Catania, Italy), Rafael Tolosana (Zaragoza, Spain), Fang-Pang Lin (NCHC, Taiwan), Arnaud Renouf (GREYC, France) and James Malone (EBI, Cambridge).
2017 - 2018 AI consultant, team lead and instructor for various institutions.
2016 - 2017 Senior Scientist, Standigm, South Korea.
2014 - 2015 Senior Researcher, Seoul National University, South Korea.
2010 - 2013 Research Associate, University of Edinburgh, UK.
2005 - 2010 Ph.D. in Informatics, University of Edinburgh, UK.
Thesis: Semantics and Planning Based Worklflow Composition and Execution for Video Processing.
2004 - 2005 MSc. in Artificial Intelligence, University of Edinburgh, UK.
MSc. Project: Translating FBPML to a Semantic Web-Based Language.
2002 - 2004
Lecturing and tutoring at University Tenaga Nasional, Malaysia.
Courses: Software Engineering, C Programming, Artificial Intelligence, Computer Literacy, Operating Systems.
1999 - 2002 Software Engineer with Altion Ltd in Dublin, Ireland.
Software development mainly involving Perl, C and Java for network telecommunications software.
1995 - 1999 Completed undergraduate in Computer Science in Trinity College Dublin, Ireland.
Final year project: On-line Handwriting Recognition using Hidden Markov Models.
2009 & 2010: System Design Project
2008: InfBase: Support for Learning
2004 - 2009: Informatics 1B (Object-Oriented Programming, Data and Analysis)
2004 - 2008: Informatics 1A (Functional Programming, Computation and Logic)
2006 - 2008: Software Engineering with Objects and Components
2006 - 2007: Informatics Research Review
Theses and Dissertations
- G. Nadarajan. "Semantics and Planning Based Workflow Composition and Execution for Video Processing". Ph.D. Thesis, CISA, School of Informatics, University of Edinburgh, 2010. [pdf]
- G. Nadarajan . "Mapping Fundamental Business Process Modelling Language to a Semantic Web Based Language". MSc. Dissertation, School of Informatics, University of Edinburgh, 2005. [pdf]
Journals and Book Chapters
Please cite this paper if you would like to quote my workflow framework:
- G. Nadarajan, C.-L. Yang, Y.-H. Chen-Burger. "Intelligent Workflow Management for Fish4Knowledge Using the SWELL System". Fish4Knowledge: Collecting and Analyzing Massive Coral Reef Fish Video Data, Intelligent Systems Reference Library, vol 104. Springer, Chapter 9, p.83-101, 2016.
- G. Nadarajan, Y.-H. Chen-Burger, R. B. Fisher. "Semantics and Planning Based Workflow Composition for Video Processing". Journal of Grid Computing, Special Issue on Scientific Workflows, 2013. [pdf] [bib]
- G. Nadarajan, A. Manataki, Y.-H. Chen-Burger. "Semantics-Based Process Support for Grid Applications". Book Chapter in Nik Bessis (ed.): Grid Technology for Maximizing Collaborative Decision Management and Support: Advancing Effective Virtual Organizations, IGI Global, May 2009. [pdf]
- G. Nadarajan and Y.-H. Chen-Burger. "Translating a Typical Business Process Modelling Language to a Web Services Ontology through Lightweight Mapping". IET Software (Formerly IEE Proceedings Software), Vol. 1, Issue 1, p.1-17, Feb 2007. [pdf]
Conferences and Workshops
- G. Nadarajan, K. Ha, H. G. Kim. "Modelling Mutation Analysis for Epigenomics with Planning and Semantics". In Semantics Based Biomedical Informatics Workshop (SEMBI), JIST 2015, Yichang, China, Nov 2015. [pdf]
- O. F. Rana, R. Tolosana-Calasanz, G. Nadarajan, C. L. Yang, and Y. H. Chen-Burger and. "Analysing Quality of Resilience in Fish4Knowledge Video Analysis Workflows". In International Workshop on Clouds and (eScience) Applications Management - CloudAM, 2013.
- E. Beauxis-Aussalet, S. Palazzo, G. Nadarajan, E. Arslanova, C. Spampinato, L. Hardman. "A Video Processing and Data Retrieval Framework for Fish Population Monitoring". Proc. 2nd ACM international workshop on Multimedia Analysis Ecological Data. ACM, 2013.
- G. Nadarajan, C.-L. Yang, Y.-H. Chen-Burger. "Multiple Ontologies Enhanced with Performance Capabilities to Define Interacting Domains within a Workflow Framework for Analysing Large Undersea Videos", 5th International Conference on Knowledge Engineering and Ontology Development (KEOD 2013), Portugal, Sept 2013.
- G. Nadarajan, C.-L. Yang, Y.-J. Cheng, S.-I. Lin, Y.-H. Chen-Burger, F.-P. Lin. "Real-time
Data Streaming Architecture and Intelligent Workflow Management for Processing Massive
Ecological Videos." International Conference on Social Computing (SocialCom) 2013, pp. 1074-1080, doi:10.1109/SocialCom.2013.173 , Washington, USA, Sept 2013.
- B. J. Boom, P. X. Huang, C. Spampinato, S. Palazzo, J. He, C. Beyan, E. Beauxis-Aussalet, J. van Ossenbruggen, G. Nadarajan, J. Y. Chen-Burger, D. Giordano, L. Hardman, F.-P. Lin, R. B. Fisher, "Long-term underwater camera surveillance for monitoring and analysis of fish populations", Proc. Int. Workshop on Visual observation and Analysis of Animal and Insect Behavior (VAIB), in conjunction with ICPR 2012, Tsukuba, Japan, Nov 2012. [pdf]
- G. Nadarajan, Y.-H. Chen-Burger. "Goal, Video Description and Capability Ontologies for Fish4Knowledge Domain". Special Session on Intelligent Workflow, Cloud Computing and Systems, KES-AMSTA 12, Croatia, June 2012. [pdf]
- G. Nadarajan, C. Spampinato, Y.-H. Chen-Burger, R. B. Fisher. "A Flexible System for Automated Composition of Intelligent Video Analysis". 7th International Symposium on Image and Signal Processing and Analysis (ISPA 2011), Dubrovnik, Croatia, September 2011.
- G. Nadarajan, Y.-H. Chen-Burger, R. B. Fisher. "SWAV: Semantics-based Workflows for Automatic Video Analysis". Special Session on Intelligent Workflow, Cloud Computing and Systems, KES-AMSTA 11, Manchester, U.K., July 2011. [pdf]
- C. Spampinato, D. Giordano, R. Di Salvo, Y.-H. Chen-Burger, R. B. Fisher, G. Nadarajan. "Automatic Fish Classification for Underwater Species Behavior Understanding". In ACM Workshop on Analysis and Retrieval of Tracked Events and Motion in Imagery Streams (ARTEMIS 10), October 2010, Florence, Italy.
- G. Nadarajan, Y.-H. Chen-Burger, R. B. Fisher. "A Knowledge-Based Planner for Processing Unconstrained Underwater Videos". In IJCAI-09 Workshop on Learning Structural Knowledge From Observations (STRUCK 09), Pasadena, California, USA, July 2009. [pdf] [slides]
- C. Spampinato, G. Nadarajan, Y.-H. Chen-Burger, R. B. Fisher. "Detecting, Tracking and Counting Fish in Low Quality Unconstrained Underwater Videos". In Proceedings of 3rd International Conference on Computer Vision Theory and Applications (VISAPP 08), Portugal, Jan 2008. [pdf]
- G. Nadarajan. "Planning for Automatic Video Processing using Ontology-Based Workflow". Doctoral Consortium at the 17th International Conference on Automated Planning & Scheduling (ICAPS 07), Providence, Rhode Island, USA, Sept 2007. [pdf]
- G. Nadarajan and A. Renouf. "A Modular Approach for Automating Video Analysis". In Proceedings of the 12th International Conference on Computer Analysis of Images and Patterns (CAIP 07), Vienna, Austria, Aug 2007. [pdf]
- G. Nadarajan, Y.-H. Chen-Burger, J. Malone. "Semantic Grid Services for Video Analysis". In Proceedings of International Workshop on Service Composition (SERCOMP 06), Hong Kong, Dec 2006. [pdf] [slides]
- G. Nadarajan, Y.-H. Chen-Burger, J. Malone. "Semantic-Based Workflow Composition for Video Processing in the Grid". In Proceedings of IEEE/WIC/ACM International Conference on Web Intelligence (WI 06), Hong Kong, Dec 2006. [pdf] [slides]
- G. Nadarajan and Y.-H. Chen-Burger. "Mapping Fundamental Business Process Modelling Language to OWL-S". In Proceedings of the 4th Hellenic Conference on Artificial Intelligence (SETN 06), Crete, Greece, May 2006. [pdf] [slides]
- G. Nadarajan and Y.-H. Chen-Burger. "An Ontology-Based Conceptual Mapping Framework for Translating FBPML to the Web Services Ontology". In Proceedings of the Sixth IEEE International Symposium on Cluster Computing and the Grid (CCGRID 06), Singapore, May 2006. [pdf] [slides]
Heriot-Watt University, Jan 2016.
Seoul National University, Sept 2014.
SEAP'13 Workshop, Taiwan. Invited Talk, Dec 2014.
NCHC, Taiwan. Invited talks, July 2012 (Taichung), April 2013 (Hsinchu).
Konkuk University, Seoul, Korea. Invited talks, Sept & Dec 2012.
3DPAS Workshop. eScience Centre, Edinburgh, April 2011.
SICSA DEMOfest poster, November 2009.
Poster at Google Retreat, Zurich, July 2009.
Informatics Jamboree Poster, June 2007.
Software Systems and Processes Group (SSP) Talk, Oct 2006.
IDIAP 15th Anniversary Workshop Invited Talk. Martigny, Switzerland, Sept 12th-13th, 2006.
Tae Kwon Do, Korean martial art.
Social Events Convener with the Informatics Graduate School (2006-10). Highlights:
Firbush Trip (with photos), Death by Dessert championship, Go-Ape Forest adventure, Paintball (Photo by Petros), Hillwalking in Pitlochry (Photos by Maria Luisa).
Please contact Alex/Iain if you have any interesting event in mind!
CompuCast, a podcast for computer scientists by Informatics, Edinburgh University.
Some Personal Photos.