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Internet Protocol Television (IPTV) describes a mechanism for transporting streams of video content encapsulated in IP packets over a managed network infrastructure using networking protocols. It provides a so called “walled garden” architecture to guarantee necessary QoE for subscribers. We analyze the different components of an IPTV system with a focus on access networks. Among many variants of access networks, DSL and WiMAX are compared from different aspects (e.g., cost, uplink and downlink bandwidth allocation, QoS, mobility, data rate) and advantages and disadvantages of each are given. [ABSTRACT FROM PUBLISHER]

The article reports on a study which compares a floating vertical axis wind turbine (FVAWT) with a floating horizontal axis wind turbine (FHAWT), both mounted on a semi-submersible. Topics discussed include the features of each type of wind turbine, the use of coupled nonlinear time domain simulation in comparing the wind turbines and domain codes used in constructing each turbine.