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The first study on the performances of an AVS/RS was proposed by Malmborg (2002), who modelled the travel time of an AVS/RS according to the number of aisles, tiers, vehicles, and lifts, by considering a random storage policy, and a tier-to-tier configuration.
The field visits and qualitative material from three of the countries revealed a two-tier configuration of community-based services which we believe deserves closer scrutiny.
Understanding the relationship between formalised CHWs and these 'hidden' volunteers, in terms of scope, location of practice and ratio to population, would be important for a comprehensive evaluation of the impact of CHWs in countries implementing this two-tier configuration, particularly with regard to child survival.
A range of factors have been identified that affect the positive impact of CHWs, and we have identified a particular two-tier configuration of a formalised, paid, often facility-based CHW cadre and a 'hidden' volunteer, community/village-based cadre that have not been systematically addressed in evaluations of CHW impact.
TDD-underlaid in the UL of the Macrocell tier with partial co-channel configuration [27].
Nagios in its simplest configuration is a two tier hierarchy; there exists a single monitoring server and a number of monitored servers.
In this deployment, there remains a single monitoring server at the top of this hierarchy, but in this configuration it polls a second tier of monitoring servers which can in turn poll additional tiers of monitoring servers.
For example, concepts of SDN can be employed to enhance mobility management, deal with inter-tier interference, and enable network-wide configuration through technology agnostic abstractions [7].
We will show later in Figs. 6 and 7 that solutions diverge from optimal when systems tiers have very different configurations and very different service demands.
Gold, Silver and Bronze in Fig. 3 are names for the different service tiers based on different configurations that are commonly used in industry.
