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The paper proposed modeling and simulation of distributed WLAN in OPNET. This model comprises of network model, node model and process model. Network model is the basic topology structure, node model describes the inside function module of all kinds of communication nodes, process model is used to make certain the management manner and management process of data. Moreover, we compare two primary channel allocation mechanisms of MAC level in IEEE 802.11 WLAN, Distributed Coordination Function (DCF) and Point Coordination Function (PCF). [ABSTRACT FROM AUTHOR]

Although the current E-Learning systems have many merits, many of them only treat advanced information technology as simple communication tools, and release some learning contents and exercises in the network. In this paper, a one-class-in-one network for emotion recognition system in E-learning is proposed and implemented in the paper. Using a large database of phoneme-balanced Chinese words read by speakers consciously trying to portray an emotion, we trained and tested this module. We achieved a recognition rate of approximately 55%. The results obtained in this study demonstrate that emotion recognition in speech is feasible, and that neural networks are well suited for this task. [ABSTRACT FROM AUTHOR]