- Invited Speaker. International Information Management Conference, Department of Information Management, NTUST, Taiwan, 27 February 2014. Topic: "Opportunities and Challenges of Mining Twitter Data".
- Public Lecture Speaker. STIMIK Amikom, 13 December 2013. Topic: "Business Intelligence: Concepts and Solution".
- Reviewer. IEEE Transactions on Computers. https://mc.manuscriptcentral.com/tc-cs.
- Reviewer. International Journal of Computational Intelligence Systems. http://journals.sfu.ca/atlantis/index.php/IJCIS.
- Chair of Organizing Committee. Second International Conference on Distributed Framework and Applications (DFmA2010), 2-3 August 2010, Jogjakarta, Indonesia. http://dfma2010.cs.ugm.ac.id
- Technical Program Committee. Second International Conference on Network Applications, Protocols and Services (NetApps2010), 22-23 September 2010, Kedah Darul Aman, Malaysia. http://www.internetworks.my/netapps2010/
- Visiting Researcher. Department of Software and Interactive Systems, Vienna University of Technology, Nopember 2009.
- Program Committee. International Conference On Creative Communication And Innovative Technology 2009 (Icc-It), 08 Agustus 2009. http://www.pribadiraharja.com/iccit
- Technical Program Committee. First International Conference on Network Applications, Protocols and Services (NetApps2008), 21-22 November 2008, Universiti Utara Malaysia. http://www.internetworks.my/NetApps2008/