capt.sherif hussein diaaeldin helmey working as the head of guided sea training institute in AASTMT(Arab Academy for Science,Technology and Maritime Transport)since 2012. He is a Master Mariner that worked as a navigation officer cheif officer and master onboard in different types of vessels. since 2008 he has been a marine lecturer in AASTMT teaching stability,cargo and seaman ship. his master degree in container evolution and its economical impact on Suez canal from the AASTMT, he also published paper in air pollution and ballast management system. Email:cptsherif@yahoo.com