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Su Y.,National Cheng Kung University | Su Y.,Kun Shan University of Technology | Huang C.,National Cheng Kung University | Chen J.,National Cheng Kung University | And 2 more authors.
Science China Technological Sciences | Year: 2010

A simple, low cost method for mass production to enhance the light extraction efficiency of GaN-related LEDs was proposed. With appropriate process parameters, the nature lithography of nanosphere can be used to fabricate two-dimensional nanostructures, including the nanomesh ZnO layer, photonic crystal (PhC) patterned p-GaN, and patterned sapphire substrates. Based on preliminary results, the extraction efficiencies of LEDs with these nanostructures can thus be improved and the nature lithography is demonstrated to be a promising method to be widely exploited in the manufacture of all kinds of LED devices. © 2010 Science in China Press and Springer Berlin Heidelberg.


Wu J.-C.,National Kaohsiung Marine University | Wang Y.-H.,Kun Shan University of Technology | Wang Y.-H.,Toppan Corporation
IEEE Transactions on Power Electronics | Year: 2011

A power-conversion system for converting three-phase power into single-phase power is proposed in this paper. The proposed three-phase to single-phase (3φ/1φ) power-conversion system comprises a power converter, a zero-sequence transformer set, and a filter capacitor. The output currents of the power converter are divided into two parts. One is a set of positive-sequence sinusoidal currents, whose phases are in phase with the voltages of the three-phase power source. The positive-sequence sinusoidal currents are employed to absorb a real power from the three-phase power source. In addition, the power converter can perform the functions of three-phase balance, low harmonic distortion, and unity power factor when the single-phase load is used. The other is a set of zero-sequence currents, which will pass through the zero-sequence transformer set and build a single-phase voltage with high power quality for the single-phase load. Since the proposed 3φ/1φ power-conversion system contains only one power converter, it has the advantages of simplifying both the power circuit and control circuit. A prototype is developed and tested to demonstrate the performance of the proposed 3φ/1φ power-conversion system. The experimental results show that the proposed system can achieve the expected performance. © 2006 IEEE.


Yu R.-F.,National United University | Chi F.-H.,Kun Shan University of Technology | Cheng W.-P.,National United University | Wang M.-H.,National United University
International Journal of Environmental Science and Technology | Year: 2015

In this study, a batch-type, nanoscale, zero-valent iron process was used to treat trichloroethylene wastewater. Variations in oxidation–reduction potential (ORP) and pH in the reactor were monitored online for use in developing the model for process control. After the addition of nanoscale, zero-valent iron, the pH value increased rapidly, from 5.0–6.0 to around 8.5–9.5, whereas the ORP decreased dramatically, from around 300 mV to −700 to −800 mV. The degradation of trichloroethylene reached equilibrium at a reaction time of about 120 min. The use of a dose of 1.5 g/L to treat an influent that had a trichloroethylene concentration of 50 mg/L resulted in a removal efficiency of 94 %. Two models, i.e., a multiple regression model and an artificial neural network (ANN) model, were used to develop the control model to predict the trichloroethylene removal efficiencies. Both the regression model and the ANN model performed precise prediction results for the trichloroethylene removal efficiencies, with correlation coefficients of about 0.87 and 0.98, respectively, resulting in great potential for controlling the trichloroethylene removal. © 2014, Islamic Azad University (IAU).


Cheng W.P.O.,National United University | Chi F.H.,Kun Shan University of Technology | Yu R.F.,National United University | Kao Y.P.,National United University
Environment Protection Engineering | Year: 2010

In this study, an on-line Nephelopmetric turbidimeter connecting to a data acquisition unit was used to monitor the algal floes formation at various velocity gradient (or mixing energy, G in s -1) values. The results indicated that the standard deviations (SD) of the turbidities during the flocculation (slow mixing) period provide more information than the floc size. In addition, this on-line monitoring technique can be a simple and effective indicator to obtain an optimal G value for a flocculation process.


Patent
Kun Shan University Of Technology | Date: 2011-12-30

In a real-time information transmission and reception system, a transmission device includes a light emitter driven by a modulated control signal generated by a modulation controller based on a code sequence, which is encoded from an input signal generated by an input unit and corresponding to information to be transmitted, to emit light. The modulated control signal has a constant average power, and various frequencies greater than 60 Hz. A reception device includes a photoelectric sensor for sensing the light emitted by the light emitter to generate a current signal that is demodulated and processed to generate a data output corresponding to the information and received by a display unit for displaying the information thereon.


Patent
Kun Shan University Of Technology | Date: 2014-05-21

A multi-input voltage-to-frequency conversion circuit includes: a multi-input operational amplifier amplifying one of multiple voltage signals in response to multiple control signals to generate an amplified voltage; a voltage-to-current converter converting the amplified voltage into a sensed current, and generating an oscillation current based on the sensed current and on an offset voltage that is associated with a predetermined frequency range corresponding to the one of the voltage signals; and a current-controlled oscillator generating, based on the oscillation current, a periodic pulse signal that has a frequency linearly proportional to the magnitude of the one of the voltage signals.

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