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All Journal Seminar Nasional Aplikasi Teknologi Informasi (SNATI) Teknika: Engineering and Sains Journal Jurnal Nasional Teknik Elektro dan Teknologi Informasi
Ira Puspasari
Institut Bisnis dan Informatika Stikom Surabaya
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Journal : Jurnal Nasional Teknik Elektro dan Teknologi Informasi

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Analisis Non-Stasioner pada Deteksi Non-Invasive Sinyal Suara Jantung Koroner Ira Puspasari
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 4 No 2: Mei 2015
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Feature extraction has become a very important factor in electronic heart sound diagnosis system development. Therefore, it is necessary to conduct a research to find an effective feature extraction method. This research has learned more about feature extraction method, using non-stationary signal processing, Short Time Fourier Transform (STFT) to extract three coronary heart disease signals. The results show that the first signal has an average frequency of 505,56±8,82 Hz. This signal is detected on an average window of 21,44±2,92, and has an average time of 0,05±0,02 s. The second signal has an average frequency of 376,11±2,20 Hz, with average window of 141,67±2,5, and average time of 0,35±0,02 s. The results of feature extraction on the third signal shows an average frequency of 217,14±12,78 Hz, average window of 74,29±4,16, and the average time is 0,17±0,02 s. This results indicates that the entire frequency has an average value of more than 200 Hz.
Otomasi Sistem Hidroponik Wick Terintegrasi pada Pembibitan Tomat Ceri Ira Puspasari; Yosefine Triwidyastuti; Harianto
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 7 No 1: Februari 2018
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Process of maintaining hydroponic wick system manually requires extra energy, especially during the cherry tomato plant breeding season. Parameters, including pH value, Electrical Conductivity (EC) nutrient solution, room temperature, and humidity are needed to be considered to produce superior seeds. In this study, room temperature and humidity, pH value, and EC content in nutrient solution were controlled. The PID and on/off controller were employed in the examination plant. The PID was applied to control room temperature. On the other hand, the on/off was applied to control room humidity, pH, and EC value. PID parameters were set to Kp = 3, Ki = 2, and Kd = 10. As a result, the system produced rise time of 60 minutes, overshoot of 1.17%, and settling time of 57.5 minutes. At the same time, the on/off controller was able to settle the humidity from 61% to 80% within 150 seconds. Moreover, reduction of the pH value from 6.9 to 5.34 can be reached within 12.8 minutes. The study of the EC showed that the longer for the water valve to open, the longer it takes to reach the set point. The study also showed that the rate of cherry tomato plant height is 2.675 cm/week utilizing both of the PID and the on/off controller, while it can only reach 0.2 cm/week without controller. Furthermore, examination on the leaf numbers per week showed that the leaf grew 2 sheets per week when both controllers were applied, while it grew no sheet without controller.
Co-Authors Harianto Musayyanah Musayyanah Pauladie Susanto Yosefine Triwidyastuti