Articles
<![CDATA[FPGA Implementation of Low-Area Square Root Calculator ]]>
<![CDATA[Aiman Zakwan Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 4: December 2015 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v13i4.1894
<![CDATA[Square root is one of the mathematical operations which are widely used in digital signal processing. Its implementation on hardware such as FPGA will provide several advantages compare to the performance offered in software. There are several algorithms which can be utilized for this calculation, but they are difficult to be implemented in FPGA. This paper presents a model of FPGA based square root calculator, which requires very low resources usage, thus occupying very low area of FPGA. The model is designed to suit the needs of medium-speed and low-speed applications which don’t need very high processing speed, while optimizing the number of resources utilized.The modified non-restoring algorithm is used in this design to compute the square root. The design is coded in RTL VHDL, and implemented in Altera DE2-board for hardware validation. The implementation produced very precise square root calculation, with low latency computation and low area consumption, for various input data width tested.]]>
<![CDATA[A Simple Checking Algorithm with Perturb and Observe Maximum Power Point Tracking for Partially Shaded Photovoltaic System ]]>
<![CDATA[Rozana Alik]]>;
<![CDATA[Awang Jusoh]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 1: March 2016 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v14i1.1356
<![CDATA[This paper presents a simple checking algorithm for maximum power point tracking (MPPT) technique for Photovoltaic (PV) system using Perturb and Observe (P&O) algorithm. The main benefit of this checking algorithm is the simplicity and efficiency of the system whose duty cycle produced by the MPPT is smoother and changes faster according to maximum power point (MPP). This checking algorithm can determine the maximum power first before the P&O algorithm takes place to identify the voltage at MPP (VMPP), which is needed to calculate the duty cycle for the boost converter. To test the effectiveness of the algorithm, a simulation model of PV system has been carried out using MATLAB/Simulink under different level of irradiation; or in other words partially shaded condition of PV array. The results from the system using the proposed approach prove to have faster response and low ripple. Besides, the results are close to the desired outputs and exhibit an approximately 98.25% of the system efficiency. On the other hand, the system with conventional P&O MPPT seems to be unstable and has higher percentage of error. In summary, the proposed method is useful under varying level of irradiation with higher efficiency of the system.]]>
<![CDATA[IMPLEMENTASI KUNCI PINTU ELEKTRONIS BERBASIS PLC OMRON CPM1 20CDR ]]>
<![CDATA[Sarif Syahrudin]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Wahyu Sapto Aji]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 5, No 3: December 2007 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v5i3.1365
<![CDATA[Penggunaan kunci manual yang beredar di pasaran sudah tidak terlalu aman lagi, karena kunci manual mempunyai beberapa kekurangan, antara lain kunci tidak praktis karena terlalu berat sehingga menjadi mudah hilang, mudah dicuri dan mudah diduplikat. Karena kekurangan tersebut maka penggunaan kunci manual semakin tidak disukai orang dan kembali beralih ke penggunaan kunci yang bekerja secara pintu elektronis. Kelebihan kunci pintu elektronis dibandingkan dengan kunci manual yaitu kunci tidak mudah hilang karena hanya dengan menghafalkan sandinya saja, pengoperasiannya lebih mudah dan lebih halus, kunci tidak bisa dicuri, tidak bisa diduplikat dan tidak mungkin tertinggal disembarang tempat. Berdasarkan perbandingan antara kunci manual dan kunci yang bekerja secara elektronis, maka diambillah topik perancangan kunci pintu yang bekarja secra elektronis terprogram, agar diperoleh sebuah bentuk yang lebih terjamin keamanannya dibandingkan dengan kunci manual. Tipe kunci pintu elektronis yang diterapkan adalah kunci pintu yang menggunakan PLC OMRON CPM1 sebagai basis utamanya.]]>
<![CDATA[PERANCANGAN SISTEM KOMUNIKASI DUA ARAH DENGAN SISTEM MODULASI FM ]]>
<![CDATA[Makmur Makmur]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 4, No 2: August 2006 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v4i2.1250
<![CDATA[Pada penelitian ini akan dirancang sistem komunikasi dua arah dengan modulasi FM dengan daya output 60-80 watt menggunakan osilator colfit dan daya 5 watt, yang kemudian diperkuat oleh transistor 2SC1946 dan transistor 2SC2630 sebagai driver booster (penguat akhir). Alat komunikasi ini diharapkan dapat dijadikan sebagai alat alternatif komunikasi tanpa kabel pada daerah terpencil. Hasil penelitian menunjukkan telah dapat dirancang sistem komunikasi dua arah dengan modulasi FM pada frekuensi 104MHz. Kekuatan sinyalnya diukur menggunakan level meter dan diletakkan pada konektor antena. Pengaktifan alat komunikasi tergantung informasi yang akan dikirim ke orang lain melalui suara ke mic maka fungsi saklar mic ini sebagai alat on/off untuk pergantian pembicaraan pada saat mengirim informasi.]]>
<![CDATA[KOMPAS DIGITAL DENGAN OUTPUT SUARA BERBASIS MIKROKONTROLER AT89S52 ]]>
<![CDATA[Fahmi Fardiyan Arief]]>;
<![CDATA[Muchlas Muchlas]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 6, No 1: April 2008 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v6i1.544
<![CDATA[In this paper, the design of digital compass with voice output is described, so that the blind can also use it. The digital compass is designed based on up-graded conventional compass. In the axis direction of conventional compass be added a disc as source of wind direction information, and phototransistor as sensor. The digital compass system is designed, based on AT89S52 microcontroller, as control of all interfaces and read sensor. The LCD component is used as display and ISD 2590 IC as voice recorder. The IC can record with maximum capacity 90 seconds. The voices output of compass is divided into 8 direction from the north, southwest, west and the next. The result showed that the design of digital compass work as like conventional compass completely by voice feature.]]>
<![CDATA[IMAGE ENHANCEMENT USING CONTRAST STRETCHING ON RGB AND IHS DIGITAL IMAGE ]]>
<![CDATA[Kartika Firdausy]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Eko Prasetyo]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 5, No 1: April 2007 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v5i1.1335
<![CDATA[Low contrast image has relatively bad quality since its information can not be directly interpreted by human eyes. It’s quality can be improved using contrast stretching operation. The objective of this paper is to design software for enhancement using contrast stretching on RGB and IHS digital image models. The operation is a point operation, that each pixel on the image is processed individually, by darkening dark pixels and brightening bright pixels. The development of the software was done using TBitmap class in Borland Delphi 6.0. Tests have been performed on BMP and PEG grayscale as well as color images. The test result shows that the developed software is capable to enhance the contrast of the sample images, which are shown by the expansion of the histograms of the images.]]>
<![CDATA[Particle Swarm Optimization Performance: Comparison of Dynamic Economic Dispatch with Dantzig-Wolfe Decomposition ]]>
<![CDATA[Mohd Ruddin Ab Ghani]]>;
<![CDATA[Saif Tahseen Hussein]]>;
<![CDATA[Zanariah Jano]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 3: September 2016 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v14i3.4054
<![CDATA[Economic Dispatch (ED) problem, in practice, is a nonlinear, non-convex type,which has developed gradually into a serious task management goal in the planning phase of the power system. The prime purpose of Dynamic Economic Dispatch (DED) is to minimize generators’ total cost of the power system. DED is to engage the committed generating units at a minimum cost to meet the load demand while fulfilling various constraints. Utilizing heuristic, population-based, and advanced optimization technique, Particle Swarm Optimization (PSO), represents a challenging problem with large dimension in providing a superior solution for DED optimization problem. The feasibility of the PSO method has been demonstrated technically, and economically for two different systems, and it is compared with the Dantzig-Wolfe technique regarding the solution quality and simplicity of implementation. While Dantzig-Wolfe method has its intrinsic drawbacks and positive features, PSO algorithm is the finest and the most appropriate solution. Conventional techniques have been unsuccessful to present compatible solutions to such problems due to their susceptibility to first estimates and possible entrapment into local optima which may complicate computations.]]>
<![CDATA[Optimal power scheduling of renewable energy sources in micro-grid via distributed energy storage system ]]>
<![CDATA[Ibrahim Alhamrouni]]>;
<![CDATA[Firdaus Ramli]]>;
<![CDATA[Mohamed Salem]]>;
<![CDATA[Bazilah Ismail]]>;
<![CDATA[Awang Jusoh]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 4: August 2020 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v18i4.15159
<![CDATA[This research is mainly focusing on the optimal power management by controlling the charging and discharging modes of the battery storage of the micro-grid (MG). A droop-based controller or battery controller is proposed for this work in order to optimize the power management of the battery. Charging and discharging modes are controlled by the droop-based characteristic where it will perform as a battery controller for the battery storage. Furthermore, the charging and discharging rates will depend on the signal from the MG at power secondary and its signal will be read by the battery controller and choose either to charge or discharge the battery storage where it will suffice the energy demand by loads in the micro-grid. The simulation results show the effectiveness of the controller to control sharing the power based on the desired energy from the battery storage to the loads at the MG. Moreover, all the critical cases have been advised, such as sudden decrease or disturbance of any generating unit. The result has been observed that due to sudden decrease or disturbance of any generating unit, the battery controller manages to control the charging and discharging rate based on the insufficient energy caused by the disturbance to fulfil the demand at MG.]]>
<![CDATA[A Fast Localization of Multiple Harmonic Sources for Rectifier Loads by Utilizing Periodogram ]]>
<![CDATA[M. Hatta Jopri]]>;
<![CDATA[A. Rahim Abdullah]]>;
<![CDATA[Mustafa Manap]]>;
<![CDATA[M. Rahimi Yusoff]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 1: March 2017 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v15i1.3120
<![CDATA[This paper introduces a fast method to localize the multiple harmonic sources (MHS) for rectifier based loads in power distribution system by utilizing periodogram technique with a single-point measurement approach at the point of common coupling (PCC). The periodogram is a fast and accurate technique for analyzing and distinguishing MHS location in power system. Matlab simulation is carried out several unique cases on IEEE test feeder cases due to validate the proposed method. The identification of MHS location is based on the significant relationship of spectral impedance which are fundamental impedance (Z1) and harmonic impedance (Zh) that's extracted from an impedance power spectrum. It is verified that the proposed method is fast, accurate, and cost efficient in localizing MHS. In addition, this method also contributes 100% correct identification of MHS location.]]>
<![CDATA[HARDWARE-RESOURCE SAVING FOR REALIZATION OF SPACE VECTOR PWM BASED ON FPGA USING BUS-CLAMPING TECHNIQUE ]]>
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 3: December 2009 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v7i3.589
<![CDATA[The space vector pulse width modulation (SV-PWM) is more suitable and can increase the obtainable DC voltage utilization ratio very much compared to others PWM. Moreover, the modulation can obtain a better voltage total harmonic distortion (THD) factor. But until now, no studies that concern at hardware resources saving to realize SV-PWM based on FPGA. This paper proposes a new technique to realize SV-PWM based on FPGA. In order to get hardware resource saving, a simple technique to judge sectors, to calculate the firing pulses and to generate SV-PWM waveform without calculation of trigonometric function using bus-clamping technique is proposed. The technique has been implemented successfully based on APEX20KE FPGA to drive three phase induction machine 1.5 kW with low ripples in current and voltage, and has been shown that the proposed SVM method required the most minimum hardware resources compared to others research. ]]>
