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The present study explored the effects of students' prior knowledge of science and online collaborative approaches on their science argumentation learning. Two science teachers and 102 students from four 8th grade science classes were invited to in our study. Students in each class were divided into three groups according to their prior knowledge level on science, they then took either our collaborative...
This paper proposes a robust observer-based output feedback control for fuzzy descriptor systems. First, we represent singular nonlinear dynamic system into Takagi–Sugeno (T–S) fuzzy descriptor model which have a tighter representation for a wider class of nonlinear systems in comparison to general state-space models. To achieve the control objective, we design a fuzzy controller and observer in a...
This paper proposes output feedback control for uncertain T-S fuzzy systems with state and input delays. First, a fuzzy observer-based dynamic control method is introduced for stabilizing uncertain time-delay fuzzy systems. Based on the dynamic control scheme, the input delay is decoupled with the system states, so that the stability condition becomes simpler. Then, the robust stability conditions...
This paper proposes output feedback control for fuzzy descriptor systems with interval time-varying delay. First, singular nonlinear dynamic systems with interval time-varying delay are taken into consideration. Then using a Takagi-Sugeno (T-S) fuzzy model, we design a fuzzy representation of the original nonlinear system. This fuzzy representation consists of local linear descriptor systems. To achieve...
This work is concerned with the multiple nonlinear systems controlled by a common remote controller via network. First, the Takagi-Sugeno (T-S) fuzzy model is used to represent the nonlinear networked systems. Then, the control law is derived based on the linear matrix inequality (LMI) approach, where the network-induced delay is taken into consideration. The proposed structure of multiple networked...
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