Jurnal Rekayasa Elektrika
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Algoritma Enkripsi Selektif Citra Digital dalam Ranah Frekuensi Berbasis Permutasi Chaos
No full textThis paper presents a selective image encryption in frequency domain. At first, the image is transformed into frequency domain with Discrete Cosine Transform (DCT), and then DCT coefficients are scanned in zigzag, and elements of the low-frequency sub-band are extracted. Encryption is performed only on selected elements by scrambling them using 2D chaos map, namely Arnold Cat Map. Next, IDCT is applied to obtain the encrypted image. The encryption algorithm is included in lossy encryption. Experiments on both grayscale images and color images show that the images can be encrypted succesfully. Histograms of the encrypted images differ significantly from histogram of the original images, and the pixels in the encrypted images are not longer correlated
Klasifikasi Bit-Plane Noise untuk Penyisipan Pesan pada Teknik Steganography BPCS Menggunakan Fuzzy Inference Sistem Mamdani
Get PDFBit-Plane Complexity Segmentation (BPCS) is a fairly new steganography technique. The most important process in BPCS is the calculation of complexity value of a bit-plane. The bit-plane complexity is calculated by looking at the amount of bit changes contained in a bit-plane. If a bit-plane has a high complexity, the bi-plane is categorized as a noise bit-plane that does not contain valuable information on the image. Classification of the bit-plane using the set cripst set (noise/not) is not fair, where a little difference of the value will significantly change the status of the bit-plane. The purpose of this study is to apply the principles of fuzzy sets to classify the bit-plane into three sets that are informative, partly informative, and the noise region. Classification of the bit-plane into a fuzzy set is expected to classify the bit-plane in a more objective approach and ultimately message capacity of the images can be improved by using the Mamdani fuzzy inference to take decisions which bit-plane will be replaced with a message based on the classification of bit-plane and the size of the message that will be inserted. This research is able to increase the capability of BPCS steganography techniques to insert a message in bit-pane with more precise so that the container image quality would be better. It can be seen that the PSNR value of original image and stego-image is only slightly different
Pencocokan Citra Sidik Jari Menggunakan Korelasi Silang Ternormalisasi
Get PDFFingerprint image matching is an important procedure in fingerprint recognition. Robust fingerprintimage matching under a variety of different image capture conditions is difficult to achieve, because of changes infinger pressure, variation of the angle, etc. Fingerprint matching is very important for the development of fingerprintsystem recognition that is sensitive to finger pressure. This paper proposes a fingerprint matching algorithm thatenables the so-called fingerprint template (extracted specific part (region of interest (ROI)) of a persons fingerprintsto be matched to the different fingerprint of the same person or different people taken on different time, angle and adifferent finger pressure using normalized cross-correlation (NCC). This algorithm was implemented in MATLAB.The results showed that the maximum NCC value for ROI of the source fingerprints and targets that was greaterthan 0.62 indicates a strong correlation or similarity
Sistem Pendukung Keputusan Rekomendasi Penerima Beasiswa Menggunakan Fuzzy Multi Attribut Decision Making (FMADM) dan Simple Additive Weighting (SAW)
Get PDFScholarship is a donation in term of financial assistance that is given to an individual, student or pupils. Eventhough, the target distribution of the scholarships is sometime not relevant. It is because the scholarship distributionhas not yet used a tool or method to determine suitable scholarship recipients. For that reason, it needs to design asystem to determine the scholarship recipients using Fuzzy Multi Attribute Decision Making (FMADM) and SimpleAdditive Weighting (SAW) method. FMADM method is used to looking for an alternative of some Alternatives withsome criteria that determined before. Moreover, SAW method is used to rank the existing alternatives. The result ofthis research can be used as a tool to make decision with recommendation of the scholarship recipients
Kajian Ekonomis Pembangkit Hybrid Renewable Energi Menuju Desa Mandiri Energi di Kabupaten Bone-Bolango
Get PDFEnergy crisis due to extensive uses of fossil fuel and environmental issues caused by unsustainable usesof energy driving the world and Indonesian government to accelerate the usage of renewable energy such as hydro,wind and solar. One of the government approaches is to implement a program called Independent Energy Village(IEV). Hybrid Optimization Model for Electric Renewables (HOMER) serves to design a micropower systems andto facilitate the comparison between some of power generation technologies. Researcher models the power systembased on the physical behavior and overall cost, which are the total cost of installation and operation of the systemduring operation of the system. HOMER allows researcher to compare various forms of system designs technicallyand economically. This research was conducted in the village of Lombongo, District Suwawa, in Bone-BolangoGorontalo. Some of the modeling results showed that the combination of micro-hydro and solar power have the mostfavorable economic value if operated over 25 years with a Net Present Cost (NPC) is US/kWh below the level energy costs of PLN at 0.116 US$/kWh in whch madethis hybrid plant is very competitive. The hybrid plant has micro-hydro generating capacity of 58,9 kW with annualproduction of 657,384 kW, while solar power plant with a production capacity of 15,7 kW per year 20.091 kW
Alat Optimasi Suhu dan Kelembaban untuk Inkubasi Fermentasi dan Pengeringan Pasca Fermentasi
Get PDFFermentation optimizer aids have been common around us in both laboratories and home industries. However, these aids only served as incubator and sometimes cannot optimize the fermentation process due to the increasing humidity in a closed box. Nevertheless, adding holes to the box will not lead to a better result since unwanted bacterias come into the box. Therefore, a fermentation optimizer aids has been realized with two separate functions, namely fermentation incubator and post-fermentation dryer. This kit works in the temperature ranging from 35 degree C 120 degree C, and equipped with two exhaust fans to minimize the humidity in both fermentation and dryermodes. The SHT11 was utilized to measure the temperature and relative humidity. A ceramic heater was used to warm up the air inside the box as desired by users. As the user interface, keypad and character LCD were used. ArduinoMega2560 serves as the main controller of the whole system. Compared to the conventional fermentation process, this kit works 9 hours faster and the fermentation objects are perfectly fermented
Potensi Energi Listrik Pada Gas Buang Sepeda Motor
Get PDFThe fossil energy sources dwindling due to the many needs, especially in industrial and automotive sectors which are the largest energy users and the highest waste heat-producing. This causes many alternative energy sources are developing, included thermal energy utilization. The research utilized waste heat energy from motorcycle exhaust pipe into electrical energy with using Thermo Electric Generator (TEG). By using the thermocouple principle, difference of temperature between hot and cold side of TEG resulted voltage. Testing was conducted with three points are on head, body and mouth of the exhaust pipe. The maximum output voltage is generated in the head is greater than the other positions. At the head of exhaust, the maximum output voltage which is generated by 1 modul, 2 modules and 3 modules of TEG on each other is 1.26 V, 2.27 V and 3.43 V respectively
Perancangan Lengan Robot 5 Derajat Kebebasan Dengan Pendekatan Kinematika
Get PDFThis study discusses the design of arm robot model with 5 degree of freedom that is designed to be a small-scale model of the articulated robot industry to simulate the movement of the robots industry. The objective of this research is to build a real arm robot based on kinematic aspects with the movement of waist, shoulder, elbow, wrist pitch, wrist roll and gripper, and to analyze the robot movement. The design includes building the real arm robot based on Arduino Uno board controller and the movement of the robot using servo motor DC. The robot can be controlled automatically from the computer with the RS-232 or USB port interface and it learns about the kinematic of the robots arm when an experiment on the forward kinematic is accomplished. The robot was running well, with the maximum distance that can be reached by the robot on the coordinate axis x = 425 mm, y = 425 mm and z = 480 mm
FPGA Implementation of Uniform Random Number based on Residue Method
Get PDFThis paper presents the implementation and comparisons of uniform random number on Field ProgramableGate Array (FPGA). Uniform random numbers are generated based on residue method. The circuit of generatinguniform random number is presented in general view. The circuit is constructed from a multiplexer, a multiplier,buffers and some basic gates. FPGA implementation of the designed circuit has been done into various Xilinx chips.Simulation results are viewed clearly in the paper. Random numbers are generated based on different parameters.Comparisons upon occupied area and maximum frequency from different Xilinx chip are examined. Virtex 7 is thefastest chip and Virtex 4 is the best choice in terms of occupied area. Finally, Uniform random numbers have beengenerated successfully on FPGA using residue method.Keywords: FPGA implementation, random number, uniform random number, residue method, Xilinx chip
Pengaruh Perubahan Set Point pada Pengendali Fuzzy Logic untuk Pengendalian Versi online (e-ISSN. 2252-620x) Suhu Mini Boiler
No full textIn this research, a mini boiler temperature control system is designed by using fuzzy logic controller (FLC). The FLC controls the valve of the incoming fuel. The mini boiler is fueled by gas, has length of 80 cm and diameter of 40 cm. FLC is designed in four different models based on the number of membership function of the temperature variable, i.e., three, five, seven and nine membership functions. The input variables are temperature and error, and the output variable is valve. There are two types of disturbance given to the control system, the disturbance of the system working at set point 125 C, and disturbance by changing the set point values. In the first type, the FLC is able to reach 125 C for all models. In the second type, the set points are varied to 100 C, and 150 C. At set point 125 C and 150 C, the FLC is able to achieve the pre-determined set points for all models. Mean while at set point 100 C, the FLC can stabilized the system at point of 97.92 C for the first model, and at the point of 100 C for other models