Connectedness in the classroom is something that has often been mentioned in researches, but it is difficult to imagine what it is specifically. One may wonder whether or not connectedness is related to students’ academic performance. With the use of Social Network Analysis, this article models and measures the connectedness among classmates and its association with their academic performance. The class under study is at the undergraduate level and the research results show that its members have fairly high adhesion and no significant dispersion. Combined with the calculation of Pearson's index (r) in SPSS, the article has arrived at findings which prove to be identical with those of many international studies: the connectedness and the centrality of a student do not correlate with his or her academic performance. The findings of this article not only provide suggestions for classroom organization and extracurricular activities but also reveal new research directions in the field of education in Vietnam via network thinking.
<p><span>In this paper, the optimal control problem of a nonlinear robot manipulator in absence of holonomic constraint force based on the point of view of adaptive dynamic programming (ADP) is presented. To begin with, the manipulator was intervened by exact linearization. Then the framework of ADP and Robust Integral of the Sign of the Error (RISE) was developed. The ADP algorithm employs Neural Network technique to tune simultaneously the actor-critic network to approximate the control policy and the cost function, respectively. The convergence of weight as well as position tracking control problem was considered by theoretical analysis. Finally, the numerical example is considered to illustrate the effectiveness of proposed control design. </span></p>
Nowadays, many countries have successfully introduced competition in production and open access to transmission. The operation ensure the power system security as well as ensure the power market economy is always interested in research. So, the requirements to ensure the power system security and to ensure the power market economy is always interested in research. This paper studies the optimal placement of SVC in power market that voltage stability is increased by PV curve as well as social welfare is increased by Locational Marginal Price (LMP). The research and application of SVC to meet the above requirements, which bring a lot of meaningful. PowerWorld 13 simulator are chosen to build up the calculation program, the test model is based on 39-bus IEEE test power system.
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