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San-Um W.,Thai Nichi Institute of Technology TNI | Suksiri B.,Thai Nichi Institute of Technology TNI | Ketthong P.,Thai Nichi Institute of Technology TNI
International Journal of Bifurcation and Chaos | Year: 2014

This paper presents a simple autonomous chaotic oscillator. The design method is primarily based on a linear oscillator constructed by a closed loop connection of two building blocks, i.e. an inverting active integrator and a passive second-order LC integrator. A diode is inserted in parallel to the two building blocks for inducing chaos. The mathematical model reveals a set of three-dimensional ordinary differential equations, containing seven terms with four constants and an exponential nonlinearity. The dynamics properties are investigated in terms of an equilibrium point, Jacobian matrix, chaotic attractors, bifurcation, Lyapunov exponents, and chaotic waveforms in time domain. The proposed chaotic oscillator potentially exhibits complex dynamical behaviors through the utilization of only six minimal electronic components. © 2014 World Scientific Publishing Company.

Songuppakarn T.,Thai Nichi Institute of Technology TNI | Wongsuwan W.,Thai Nichi Institute of Technology TNI | San-Um W.,Thai Nichi Institute of Technology TNI
Proceedings of the 2014 International Conference and Utility Exhibition on Green Energy for Sustainable Development, ICUE 2014 | Year: 2014

A predictive models were developed to determine the thermal comfort level for the academic classroom by using artificial neural networks (ANNs). The paper reports experimental and theoretical analysis on a problem of achieving a desired thermal comfort level. The proposed method focused on the classical artificial (feed forward) neural networks (ANN) and the time-series NARX feedback neural networks to achieve the thermal comfort assessed using the predicted mean vote (PMV). The field measurements were conducted in a selected classroom of the Thai-Nichi Institute of Technology (TNI), Thailand. The predicted PMV agreed well with tested PMV data. Therefore, the results would be further demonstrating the feasibility and performance of the approach to achieve the classroom thermal comfort. © 2014 Asian Institute of Technology.

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