1. Variable structure control for a continuous bioreactor, IEEE TENCON September 2000, Kuala Lumpur, Pages 433-436 (2000). (with H.J. Tam, M.A, Hussain).
2. Sliding mode control of a fermentation process, Regional Symposium on Chemical Engineering 2000, Singapor, 11-13 December (2000). (with H.J. Tham and M.A. Hussain)
3. Production of lipase by Candida cylindracea DSM 2031, Regional Symposium on Chemical Engineering 2000, Singapore, 11-13 December (2000). (with Ishenny M. Noor and Masitah Hasan)
4. Feed rate optimization of Fed Batch fermentation, Regional Symposium on Chemical Engineering 2000, Singapore, 11-13 December (2000). (with Hisbullah and M.A. Hussain)
5. Hybrid neural network approach in controlling fed batch fermentation, 2nd International Seminar on Numerical Analysis and Engineering, 14-15 March, Batam Island, Indonesia (2001). (with Hisbullah, M.A. Hussain)
6. Effect of pH on growth, spore production and spore viability of biocontrol agent Trichoderma harzanium in submerged fermentation. RSCE, Bandung, Indonesia 29-31, October 2001. Pages BP7.1-6 (With Syahiddin Dahal, Masitah Hasan)
7. Effect of hollow fibre membrane material and operating conditions on lipase adsorption, 5th International Membrane sciences and Technology Conference, November 10-14, 2003, Sydney, Australia. (with M. Shamel and M.Hasan)
8. Volume Expansion of organic solvent in carbon dioxide and stearic acid mixtures at elevated pressure, Regional Symposium on Chemical Engineering, Philippines, Dec.1- 3, 2003 (with H.Singh and M.Y. Yap)
9. Design of Neural Network Inverse Model Controller to Control Dissolved Oxygen Concentration in Sequencing Batch Reactor, Regional Symposium on Chemical Engineering, Philippines, Dec.1- 3, 2003 (with Azwar and M.A. Hussein).
10. Volume Expansion of Binary and Ternary Systems at elevated Pressure. . Proceedings of "The 17th Symposium of Malaysian Chemical Engineers", Pages 765-771, December 29-30, 2003, Penang, Malaysia. (with Yap Yin Yee and Harcharan Singh)
11. Unsteady state and high enzyme concentration models for the kinetics of hydrolysis of palm oil by lipase. Regional Symposium on Chemical Engineering 2004. December 1-3, 2004, Bangkok, Thailand. (with S. Al-Zuhair and Masitah Hasan).
12. Measurement and correlation of stearic acid solubility in organic solvents by uniquac equation, lipase. Regional Symposium on Chemical Engineering 2004. December 1-3, 2004, Bangkok, Thailand. (with Yap Min Yee and Harcharan Singh).
13. Waste water strength and total COD removal in an upflow anaerobic sludge blanket reactor, Asian Pacific Confederation of Chemical Engineering Congress, 27th - 30th August 2006, Kuala Lumpur. (with Jennifer Tan Yee Ying and M.A. Hashim).
14. Optimization of recovery of Polyhydroxyalkanoates (PHAs) through enzymatic digestion, Asian Pacific Confederation of Chemical Engineering Congress, 27th - 30th August 2006, Kuala Lumpur. (with K. Yasotha, M.K. Aroua and I.K.P.Tan).