1. Lect., Dept. of Agr. Engrg., Lincoln Coll., Univ. of Canterbury, Canterbury, New Zealand
2. Lect., Dept. of Civ. Engrg., Universiti Technoloji Malaysia, Malaysia; formerly, Post-Grad. Research Student, Dept. of Agr. Engrg., Lincoln Coll., Univ. of Canterbury, Canterbury, New Zealand