The media stream engine is responsible for audio/video capture and playback, the conferencing control protocol defines a set of conventions governing the structure and behavior of communication messages, the transmission module consists of a peer and a distribution network constituting of the peers also the delivery and exchange of streaming data while the audio manager and video manager use TCP/UDP to broadcast to other peer. The proposed Campus video conference system is made up of five modules which are the media stream engine, the conferencing control protocol, transmission module, TCP/UDP module and the user interface module. This paper describes the design and implementation of campus video conference system based on P2P architecture that was tested within premises of Ladoke Akintola University of Technology, Ogbomoso, Nigeria. This is achieved at the cost of higher latency for locating the resources of interest in the P2P overlay network. Also, the extraction efficiency gets lower as the extraction system requires accurate coupling between several energy levels.Peer to Peer (P2P) systems inherently have high scalability, robustness and fault tolerance because there is no centralized server and the network self-organizes itself. In addition, it is found that strong electron-ionized donor separation at high temperature can induce level misalignment, which can stagger the optimal conditions of injection and extraction. So even though the resonant-tunneling injection seems efficient enough to compensate the electron runoff at the upper state, the electron density at lower level state increases and the overall PI turns out lower. In this case, the resonant-phonon extraction system is incapable of depleting all the electrons from lower level states. To be specific, the increased temperature brings about intense thermally activated longitudinal optical phonon scattering, leading to large amounts of electrons scattering to lower level state.

It is demonstrated that the limited extraction efficiency of the extraction system dominates the decrease of PI at elevated temperatures. Herein, the mechanism of the temperature degradation of PI is investigated microscopically.

Degraded population inversion (PI) at elevated temperature, regarded as an important temperature degradation factor in terahertz quantum cascade lasers (THz QCL), has hindered the widespread use of these devices.

System sequence diagram online