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It is widely accepted that cloud computing technologies will soon have substantial impact on a broad range of industrial and institutional sectors such as governance, health care, education, agriculture, logistics, manufacturing, media etc. Cloud infrastructures are typically based on virtualized environments to allow physical infrastructure to be shared by multiple and diverse end users. However, the efficient sharing of a cloud infrastructure can be performed only through user-centered service admission control procedure, which should also be flexible enough to adapt to the various real market cloud deployment scenarios. Several conflicting parameters such as the type of the hybrid cloud infrastructure being deployed, multiple user priority groups, security, energy efficiency and financial costs should also be taken into account. Thus, aiming to deal with all these emerging resource management trade-off problems, we propose in this paper a user-oriented, highly customizable infrastructure sharing approach, namely IaaS Request Admission Control (IRAC), designed for Hybrid Cloud Computing Environments.