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Salatiga, Indonesia

Satya Wacana Christian University, or Universitas Kristen Satya Wacana , is a private university located in Salatiga, Central Java, Indonesia. Wikipedia.

Dewantoro G.,Satya Wacana Christian University
Proceedings - 2015 7th International Conference on Information Technology and Electrical Engineering: Envisioning the Trend of Computer, Information and Engineering, ICITEE 2015

The finest design of the proportional-integral derivative (PID) controller plays an important role in achieving a satisfactory response of any rotational electro-mechanical system. This paper presents an optimal design of the PID controller in the DC motor by using the Taguchi method. The proportional gain, the integral gain, the derivative gain constitute the search space for the optimization problem. The objective of PID optimization is to minimize the integral squared error of the step response. The predicted optimum values of the control variables are determined by the Taguchi method using analysis of means. Analysis of variance (ANOVA) is used to select the most significant control parameters. Computer simulation shows that the performance of fine-tuned PID controller using Taguchi method is better than that of traditional open loop Ziegler-Nichols technique. © 2015 IEEE. Source

Feriyonika,Bandung State Polytechnic | Dewantoro G.,Satya Wacana Christian University
International Journal of Artificial Intelligence

In this study, injection velocity in injection molding process was analyzed. Since physical behavior of thermoplastic and environmental condition in injection machine such as high temperature and pressure make a complex dynamics in injection molding system, the injection velocity is consequently difficult to control by some classical control methods. Hence, robust and adaptive control (Fuzzy Sliding Mode Control) was proposed to control the injection velocity in finite time. In this control strategy, sliding mode control intended to overcome system dynamics, while Fuzzy controller would decrease both output error and chattering phenomena due to sliding mode process. The simulation results showed that proposed control could decrease chattering phenomena and followed velocity set point with small error. The two cycles of set point were also presented to examine controller's robustness. In future, this proposed control can be potentially applied in real system. © 2013 by IJAI (CESER Publications). Source

Hendry,Chaoyang University of Technology | Pramadharma H.,Satya Wacana Christian University | Chen R.-C.,Chaoyang University of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Website is a media that can be used to find information. Every website visitors have different characteristics that makes them interested in the different parts of information. The information is often displayed in the form of a picture or a link, by allowing user to manipulate images or links based on their needs, it will make the website more personalized. This technology is then applied to a browser extension called W-Changer extension. W-Changer extension works by injecting its functions into a website page and allows the user to manipulate images and links in the website page according to their needs. Then, the results of the manipulation can be saved in web storage by applying HTML5 web storage technology. It can be implemented for website which is not use DOMContentLoaded event. © Springer International Publishing Switzerland 2015. Source

Papilaya V.N.,Satya Wacana Christian University | Vinck A.J.H.,University of Duisburg - Essen
IEEE Transactions on Power Delivery

We call the Häring-iterative scheme with the clipping-nulling scheme as the preprocessing impulsive noise (IN) mitigation scheme: Mengi-Häring (MH)-iterative scheme. In this paper, we report two ideas that can significantly improve its performance. The first idea is to use the replacement-nulling scheme as the preprocessing IN mitigation scheme. The second idea is to use the output vector of the preprocessing IN mitigation scheme in all iterations. To show the performance comparison between the MH-iterative scheme and our proposed scheme, we conduct some simulations in the simplified model of the Middelton's additive white class A noise model and present performance in terms of the bit-error rate as a function of the signal-to-noise ratio. © 2014 IEEE. Source

Mangimbulude J.C.,Satya Wacana Christian University | van Straalen N.M.,VU University Amsterdam | Roling W.F.M.,VU University Amsterdam
Waste Management

Ammonium is one of the major toxic compounds and a critical long-term pollutant in landfill leachate. Leachate from the Jatibarang landfill in Semarang, Indonesia, contains ammonium in concentrations ranging from 376 to 929mgNL -1. The objective of this study was to determine seasonal variation in the potential for organic nitrogen ammonification, aerobic nitrification, anaerobic nitrate reduction and anaerobic ammonium oxidation (anammox) at this landfilling site. Seasonal samples from leachate collection treatment ponds were used as an inoculum to feed synthetic media to determine potential rates of nitrogen transformations. Aerobic ammonium oxidation potential (<0.06mgNL -1h -1) was more than a hundred times lower than the anaerobic nitrogen transformation processes and organic nitrogen ammonification, which were of the same order of magnitude. Anaerobic nitrate oxidation did not proceed beyond nitrite; isolates grown with nitrate as electron acceptor did not degrade nitrite further. Effects of season were only observed for aerobic nitrification and anammox, and were relatively minor: rates were up to three times higher in the dry season. To completely remove the excess ammonium from the leachate, we propose a two-stage treatment system to be implemented. Aeration in the first leachate pond would strongly contribute to aerobic ammonium oxidation to nitrate by providing the currently missing oxygen in the anaerobic leachate and allowing for the growth of ammonium oxidisers. In the second pond the remaining ammonium and produced nitrate can be converted by a combination of nitrate reduction to nitrite and anammox. Such optimization of microbial nitrogen transformations can contribute to alleviating the ammonium discharge to surface water draining the landfill. © 2011 Elsevier Ltd. Source

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