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Volume 21, Issue 01, May 2016 1.          Challenges and Benefits in 4G Wireless Networks                         Abstract  ![]() 2.          Automatic Light Street                         Abstract  ![]() 3.          Automated Gate Railway Crossing Road using Steel Kerb                         Abstract  ![]() 4.          Effect of Viscous Friction Coefficient Variation on Robot's Joint PID Control                         Abstract  ![]() 5.          Quality of Services in Mobile Networks in Sudan and the Customer’s Choice                         Abstract  ![]() |