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All Journal International Journal of Electrical and Computer Engineering International Journal of Power Electronics and Drive Systems (IJPEDS) Biologi Edukasi : Jurnal Ilmiah Pendidikan Biologi Bulletin of Electrical Engineering and Informatics

Zulfikar Zulfikar

Syiah Kuala University

Author-ID : 2374066

Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering

Published : 7 Documents Claim Missing Document

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Articles

FPGA Hardware Realization: Addition of Two Digital Signals Based on Walsh Transforms Zulfikar Zulfikar; Shuja A Abbasi; Abdul Rahman M Alamoud
International Journal of Electrical and Computer Engineering (IJECE) Vol 6, No 6: December 2016
Publisher : Institute of Advanced Engineering and Science

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This paper presents hardware realization of addition of two digital signals based on Walsh transforms and inverse Walsh transforms targeted to the Xilinx FPGA Spartan 3 board. The realization utilizes Walsh Transform to convert the input data to frequency domain and the inverse Walsh transform to reconvert the data from frequency domain. The designed system is capable of performing addition, subtraction, multiplication and Arbitrary Waveform Generation (AWG). However, in the present work, the hardware realization of addition only has been demonstrated. The Clock frequency for realization into the board is supplied by an external function generator. Output results are captured using a logic analyzer. Input data to the board (system) is passed manually through the available slide switches on-board.

Design of 8-point DFT based on Rademacher Functions Zulfikar Zulfikar; Hubbul Walidainy
International Journal of Electrical and Computer Engineering (IJECE) Vol 6, No 4: August 2016
Publisher : Institute of Advanced Engineering and Science

This paper presents a new circuit design for 8-point DFT algorithm based on product of Rademacher functions. The design has been adopted from the famous 8-point DFT decimation in time which is mainly constructs of two 4-point and four 2-point DFTs. However, the operation of the design circuit is different. It utilized the advantage of Rademacher functions simplicity. Therefore, the proposed design is constructed form the previous design 4-point DFT which is based on product of Rademacher functions [6]. Some analysis upon number types and internal connections to achieve a more efficient circuit have been conducted. As a result, instead of four, the proposed design requires only three 2-point DFT. Several output results of the design DFT have been removed since they are equal in terms of magnitude, two negative circuit are required as a compensation. Moreover, the previous 4-point DFT has been replaced to the efficient one. This circuit is special designed for non stand alone used, the circuit must be integrated inside the proposed 8-point DFT.

FPGA Realizations of Walsh Transforms for Different Transform and Word lengths into Xilinx and Altera Chips Zulfikar Zulfikar; Shuja A. Abbasi; Abdulrahman M. Alamoud
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 6: December 2018
Publisher : Institute of Advanced Engineering and Science

This paper presents FPGA realizations of Walsh transforms. The realizations are targetted for the system of arbitrary waveform generation, addition/ subtraction, multiplication, and processing of several signals based on Walsh transforms which is defined in term products of Rademacher functions. Input signals are passing through the system in serial, the output either signals or coefficients are also passing out in serial. To minimize the area utilization when the systems are realized in FPGA chips, the word lengths of every processing step have been designed carefully. Based on this, FPGA realizations of those various applications into Xilinx and Altera chips have been done. In Xilinx realizations, Xilinx ISE was used to display the results and to extract some critical parameters such as speed and static power. Meanwhile, the realizations into Altera chips have been conducted using Quartus. Comparisons of speed and power among Xilinx and Altera chip realizations are presented here even though this is not an apple to apple comparison. Finally, it can be concluded that Walsh transforms can be realized not only for the applications that have been done here, but it is potential can be used for other applications.

An Improved Design of Linear Congruential Generator based on Wordlengths Reduction Technique into FPGA Hubbul Walidainy; Zulfikar Zulfikar
International Journal of Electrical and Computer Engineering (IJECE) Vol 5, No 1: February 2015
Publisher : Institute of Advanced Engineering and Science

This paper exposes an improved design of linear congruential generator (LCG) based on wordlengths reduction technique into FPGA. The circuit is derived from LCG algorithm proposed by Lehmer and the previous design. The wordlengths reduction technique has been developed more in order to simplify further circuit. The proposed design based on the fact that in applications only specific input data were used. Some nets connections between blocks of the circuit are ignored or truncated. Simulations either behavior or timing have been done and the results is similar to its algorithm. Four best Xilinx chips have been chosen to extract comparison data of speed and occupied area. Further comparison of occupied area in terms of flip-flop and full adder has been made. In general, the proposed design overcome the previous published LCG circuit.

An Alternative Power Supply System During Peak Loads Using Solar Cells Zulfikar Zulfikar; Zulhelmi Zulhelmi; Agus Mulyadi
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 3: September 2018
Publisher : Institute of Advanced Engineering and Science

Utilization of renewable energy becomes a necessity in the future due to the fossil energy supply continues to decline. In Indonesia, the use of electricity from renewable sources is minimal. The utilization of solar energy in Indonesia is still limited to remote areas or islands. The main problem of electricity in Indonesia, especially in the city of Banda Aceh, is the frequent occurrence of power outages from the state power plant (PLN), especially during peak load time (WBP). Outside of that time, electricity supply exceeds demand. This study aims to utilize solar energy to reduce the electricity consumption of PLN during WBP. The system is designed to divert the power supply from PLN to the solar power plant (PLTS). The results of a survey of 10 A (current limit) customers are used as a reference to calculate PLTS capacity. During WBP, PLTS supplies to the load, beyond that time, PLN will supply the load. The system is designed to store maximum energy beyond the WBP period into the battery, the source of energy is mainly from the PLTS and alternatively from the PLN when the PLTS can not supply the maximum power. Based on battery energy, the system diverts the load supply from PLN when the battery energy is below the recharge limit. In the case of 10 A customers, with the energy requirement during WBP of 4.3 kWh, it requires 12 solar panels (160 Watt maximum power) arranged in parallel. Thus, the system needs three batteries with 150 Ah capacity also assembled in parallel. The implementation results prove that the PLTS can store solar energy to the battery properly, the system also successfully divert the PLTS source to the load at the time of WBP and transfer back to the PLN source when the battery energy is less than the recharge limit.

Image investigation using higher moment statistics and edge detection for recognizing abnormal skin Afdhal Afdhal; Zulfikar Zulfikar; Zulhelmi Zulhelmi; Teuku Yuliar Arif
Bulletin of Electrical Engineering and Informatics Vol 9, No 1: February 2020
Publisher : Institute of Advanced Engineering and Science

This paper discusses the recognition of skin abnormalities by investigating the images using high-level statistics and edge detection. Six images of skin diseases were analyzed using several statistical parameters, including high-level moments such as skewness and kurtosis. In comparison, some images from other categories such as animal, architecture, art, vehicle, food, people, and scenery have been analyzed as well. The results were compared to skin disease images. It is expected that the general pattern of statistical parameters can distinguish skin images against images from other categories. MatLab is used as a medium to calculate the values of statistical parameters. The mean and median of the skin disease image are much larger. Meanwhile, the standard deviation is the smallest compared to other categorical images. Almost all the analyzed images close to symmetry. Nearly all images category are distributed more leaning to the left, except for the images of the art category, which is slightly more leaning to the right. Moreover, the edge detection process has been done using the Sobel algorithm. The result, however, cannot clearly distinguish a skin's abnormality. This difficulty is because of the lack of accuracy in selection the intensity.

Population Density of Thalassina scorpionides (Rama-Rama) in the Reuleung River Mangrove Ecosystem, Leupung, Aceh Besar Zulfikar Zulfikar; M. Ali Sarong; Mimie Saputri
Biologi Edukasi: Jurnal Ilmiah Pendidikan Biologi Vol 11, No 2 (2019): Biologi Edukasi: Jurnal Ilmiah Pendidikan Biologi
Publisher : Universitas Syiah Kuala

Thalassina scorpionides (Rama-Rama) belong to the Thalassina genus and act as a detritivor. However, information on the density of T. scorpionides based on domestic and overseas literature is still low therefore research needs to be done on population density of T. scorpionides in Mangrove Ecosystem of Reuleung River Leupung District of Aceh Besar Regency. The research was conducted in July 2017. The purpose of this study was to determine the population density of T. scorpionides. Data obtained through survey method with purposive sampling technique. The sampling location is divided into 5 stations and each station has 3 plots. Population density analysis using population density formula. The result showed that population density of T. scorpionides at station I was 3 ind / m2, station II 1 ind / m2, station III 1 ind / m2, station IV 1 ind / m2, and station V 2 ind / m2. Population density of T. scorpionides is most common in station I and the lowest population density is found in station III. Abiotic factor at location of observation station of T. scorpionides that is temperature of water ranged from 25oC-31oC, air temperature 25oC-33oC, salinity of 17 ‰ -22 ‰, and soil pH ranged from 5-7.2, water pH ranged from 5-7.4 and substrate in the form of sandy clay soils, fine pebbles, sludge mud, gravel, and muddy.

Co-Authors Abdul Rahman M Alamoud Abdulrahman M. Alamoud Afdhal Afdhal Agus Mulyadi Ali Sarong Hubbul Walidainy Mimie Saputri Shuja A Abbasi Shuja A. Abbasi Teuku Yuliar Arif Zulhelmi .

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