Title	SIP Mobility Modes: Application Layer and Data Link Layer
Author	Abdullah Azfar, Sakhawat Hossen, Razib Hayat Khan
Citation	Vol. 9  No. 12  pp. 258-264
Keywords	Session Initiation Protocol (SIP), Mobility, Handoff delay, Mobile Host (MH), Corresponding Host (CH)

Title	A Hierarchical Intrusion Detection System in Wireless Sensor Networks
Author	Safiqul Islam, Razib Hayat Khan, Dewan Muhammad Bappy
Citation	Vol. 10  No. 8  pp. 21-26
Keywords	WSN, IDS, Sensor networks

Title	The Use of Real Option Analysis (ROA) to assist in Security Solution Decisions
Author	Razib Hayat Khan
Citation	Vol. 11  No. 10  pp. 108-119
Keywords	Real option, Real option analysis, Security solution decision, Uncertainty