The catchment population is, at any given time, the totality of those in the âwere -wouldâ state of: were the. illness now to occur, it would be âcaughtâ by that case identification scheme [Source: Miettinen OS, 2007] Study base , a. series of person-.
A tier 1 network is an Internet Protocol (IP) network that participates in the Internet solely via settlement-free interconnection, also known as settlement-free peering.y the strict definition of peering and the strict definition of a tier 1 network, a tier 1 network only peers with other tier 1 networks and has no transit routes going anywhere.
Tier Classifications Tier 1. the Military Definition: The term Tier 1 when used by the military refers to special operations forces with covert operations and counter terrorism capabilities. Tier 1 can refer to the unit or the operator. Originally Tier 1 referred to the amount of training a unit conducted in hostage rescue. Currently it is used to refer to the priority of funding for training and operations. Tier 1 military operators are some of the worlds best counter terrorist.