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We formulate the problem as an Integer Linear Program (ILP) and propose a Pattern-based Cost-efficient Proactive VNF placement and chaining (PCPV) algorithm. ... Value-added services (VASs) are an integral part of todays Content Delivery Networks (CDNs). They can be implemented as a chain of Virtual Network Functions (VNFs). ... PATTERN-BASED COST-EFFICIENT PROACTIVE VNF PLACEMENT (PCPV) PCPV is run once for each SC which is accessed by a set of EUs. ...doi:10.1109/netsoft.2018.8459986 dblp:conf/netsoft/AhvarSADGEC18 fatcat:raracxibvvgk3nrfrs7st2n6qy