Multimedia services such as Live Video-Streaming (LVS) or Video on Demand are the main drivers behind the notable traffic growth in cellular networks. This fact has attracted the interest of both academia and telcos in improving the end user's quality of experience. For this reason, the development of test benches for conducting traffic studies in this type of telecommunication system is necessary and emulators are a good option to validate possible solutions without affecting the real systems. However, most works addressing the emulation of Long-Term Evolution (LTE) systems do not validate their outcomes with real environments and hence ignore critical parameters such as the impact of wireless propagation under different scenarios. Therefore, the goal of this paper is to validate an outdoor propagation model for LVS so that accurate studies of traffic characterization in LTE networks can be carried out using an emulation tool. The validation is done through a statistical analysis of variance (ANOVA) of Quality of Service metrics, comparing the results obtained in an LTE-emulated scenario with those obtained in a real LTE test bench. For this study, the LVS service runs on top of a reliable transport protocol. Specifically, we test the Real-Time Message Protocol and the MPEG Dynamic Adaptive Streaming over HTTP (DASH) protocol, both using TCP at the transport layer. According to the results, the propagation model that better matches the real environment under the considered conditions is the Nakagami-m propagation model with m = 5.
El artículo presenta los hallazgos de la primera etapa de un estudio de caso, sobre el placer y el sufrimiento en el trabajo, cuyo trabajo de terreno fue una observación participante en una sucursal de una cadena canadiense de distribución al detal. El propósito es poner a disposición de los estudiosos del análisis organizacional, del management y de la administración de personal algunas definiciones logradas a partir de ciertos recursos bibliográficos (teóricos y metodológicos) de la sociología clínica, la psicodinámica del trabajo y la sociología de las emociones. Se trata de las dimensiones social y técnica de la organización del trabajo y de una forma de alienación subjetiva actual. La principal premisa que puede presentarse, como conclusión, es que la organización actual del trabajo tiende a ser percibida por el trabajador como fuente potencial de amenazas y, sin saberlo, elige protegerse a partir de la alienación subjetiva.
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