Title	Vulnerability Analysis through a Graph-based Protection System
Author	Mohammad Ebrahim Rafiei, Rasool Jalili, Hamid Mousavi
Citation	Vol. 6  No. 12  pp. 311-319
Keywords	Vulnerability Analysis, Protection System, Safety Problem, NP-Completeness.

Title	A Model-Oriented Dynamic Architecture and Its Supporting System
Author	Yang He-biao, Zhang Jian-ming, Zhan Yong-zhao
Citation	Vol. 6  No. 12  pp. 304-310
Keywords	Model, Software architecture, Dynamic evolution, Framework

Title	Interoperability Mechanisms for Registration and Authentication on Different Open DRM Platforms
Author	Carlos Serr?o, Victor Torres, Jaime Delgado, Miguel Dias
Citation	Vol. 6  No. 12  pp. 291-303
Keywords	DRM, interoperability, security, registration, authentication

Title	Hybrid adaptation of the maximum contention window (CWmax) and minimum contention window (CWmin) for Enhanced Service Differentiation in IEEE 802.11 Wireless Ad-hoc Networks
Author	Hassan Takabi, Ali H. Moghadam, Ahmad Khonsari
Citation	Vol. 6  No. 12  pp. 281-290
Keywords	IEEE 802.11e, QoS, EDCA, back-off algorithm, wireless ad-hoc networks, hybrid adaptation algorithm, CWmax, CWmin