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28,451 Article Results

Distance Estimation based on Color-Block: A Simple Big-O Analysis

10.11591/ijece.v7i4.pp2169-2175
Budi Rahmani , Hugo Aprilianto , Heru Ismanto , Hamdani Hamdani
This paper explains how the process of reading the data object detection results with a certain color. In this case the object is an orange tennis ball. We use a Pixy CMUcam5 connecting to the Arduino Nano with microcontroler ATmega328-based. Then through the USB port, data from Arduino nano re-read and displayed. It’s to ensure weather an orange object is detected or not. By this process it will be exactly known how many blocks object detected, including the X and Y coordinates of the object. Finally, it will be explained the complexity of the algorithms used in the process of reading the results of the detection orange object.
Volume: 7
Issue: 4
Page: 2169-2175
Publish at: 2017-08-01

A 300 GHz CMOS Transmitter Front-End for Ultrahigh-Speed Wireless Communications

10.11591/ijece.v7i4.pp2278-2286
Tuan Anh Vu , Minoru Fujishima
This paper presents a 300 GHz transmitter front-end suitable for ultrahigh-speed wireless communications. The transmitter front-end realized in TSMC 40 nm CMOS consists of a common-source (CS) based doubler driven by a two-way D-band power amplifier (PA). Simulation results show that the two-way D-band PA obtains a peak gain of 21.6 dB over a -3 dB bandwidth from 132 GHz to 159 GHz. It exhibits a saturated power of 7.2 dBm and a power added efficiency (PAE) of 2.3%, all at 150 GHz. The CS based doubler results in an output power of 0.5 mW at 300 GHz. The transmitter front-end consumes a DC power of 205.8 mW from a 0.9 V supply voltage while it occupies an area of 2.1 mm2.
Volume: 7
Issue: 4
Page: 2278-2286
Publish at: 2017-08-01

Determining the Complex Permittivity of Building Dielectric Materials using a Propagation Constant Measurement

10.11591/ijece.v7i4.pp1681-1685
Mohammed Bendaoued , Jaouad Terhzaz , Rachid Mandry
This paper presents a technique to determine the Dielectric constant and dielectric loss of the building dielectric materials using propagation constant measurements. The material sample is loaded in an X-band (8.5GHz-12.5GHz) rectangular waveguide and its two port S-parameters are measured as a function of frequency using a Vector Network Analyzer without TRL Calibration. The results obtained from samples of dielectric materials  (Air, Cellular concrete and  Wood)  on  the  X-band  frequencies show  the  validity  of  the  proposed technique to determine the complex permittivity of the building dielectric materials on the X-band frequencies.
Volume: 7
Issue: 4
Page: 1681-1685
Publish at: 2017-08-01

TCAD Simulations and Small Signal Modeling of DMG AlGaN/GaN HFET

10.11591/ijece.v7i4.pp1839-1849
Rahis Kumar Yadav , Pankaj Pathak , R M Mehra
This article presents extraction of small signal model parameters and TCAD simulation of novel asymmetric field plated dual material gate AlGaN/GaN HFET first time. Small signal model is essential for design of LNA and microwave electronic circuit by using the proposed superior performance HFET structure. Superior performances of device are due to its dual material gate structure and field plate that can provide better electric field uniformity, suppression of short channel effects and improvement in carrier transport efficiency. In this article we used direct parameter extraction methodology in which S-parameters of device were measured using pinchoff cold FET biasing. The measured S-parameters are then transformed into Y-parameters to extract capacitive elements and then in to Z-parameters to extract series parasitic elements. Intrinsic parameters are extracted from Y-parameters after de-embedding all parasitic elements of devce. Microwave figure of merits and dc performance are also studied for proposed HFET. The important figure of merits of device reported in the paper include transconductance, drain conductance, current gain, transducer power gain, available power gain, maximum stable gain, maximum frequency of oscillation, cut-off frequency, stability factor and time delay. Reported results are validated with experimental and simulation results for consistency and accuracy.
Volume: 7
Issue: 4
Page: 1839-1849
Publish at: 2017-08-01

Design of Volatility Model in Nifty 50 Index using Thin Plate Spline Regression

10.11591/ijeecs.v7.i2.pp426-433
Poornima B , Vijayalakshmi C , Somasundaram S
The analysis of volatility in stock markets has important consequences for investors and traders. The presence of volatility increases market risks and therefore discourages investment in the stock market. The proper study and understanding of volatility is needed for prudent risk management. In this paper, the market volatility in the National Stock Exchange in India as measured by the India Volatility Index is analyzed. The daily volatility in NIFTY 50 index is regressed on the price to earnings ratio and the volatility of previous day. The market volatility within a period of time is highly correlated and the highly volatile periods coincide with large impact negative events on a national and global scale. The Price to Earnings ratio represent the fundamentals of the market and it also strongly influences the price movements. The nonlinear regression problem is formulated and solved using thin plate spline regression technique. This effectively captures the nonlinear aspect of the problem. Results indicate that volatility has high upward correlation during middle range of P/E ratios than in the upper and lower ranges. Therefore risk management techniques using option derivatives are more important during the middle range of values of P/E ratio.
Volume: 7
Issue: 2
Page: 426-433
Publish at: 2017-08-01

Integral Backstepping Control for Maximum Power Point Tracking and Unity Power Factor of a Three Phase Grid Connected Photovoltaic System

10.11591/ijece.v7i4.pp1671-1680
Hicham Bahri , Mohamed Aboulfatah , M’hammed Guisser , Elhassane Abdelmounim , Mohammed El Malah
This paper presents a robust control strategy for a grid connected photovoltaic system with a boost converter by using an integral Backstepping method based on a nonlinear state model, which guarantees the Lyapunov stability of the global system. The system has tracked precisely the maximum power point, with a very fast response and the unit power factor has been observed under different atmospheric conditions. Moreover, the best advantage of the controller is that it’s a good corrector of the grid perturbation and system parameter disturbance. The simulation result has demonstrated the performance of this strategy.
Volume: 7
Issue: 4
Page: 1671-1680
Publish at: 2017-08-01

Design of a Selective Filter based on 2D Photonic Crystals Materials

10.11591/ijece.v7i4.pp1833-1838
Lallam Farah , Badaoui Hadjira , Abri Mehadji
Two dimensional finite differences temporal domain (2D-FDTD) numerical simulations are performed in cartesian coordinate system to determine the dispersion diagrams of transverse electric (TE) of a two-dimension photonic crystal (PC) with triangular lattice. The aim of this work is to design a filter with maximum spectral response close to the frequency 1.55 μm. To achieve this frequency, selective filters PC are formed by combination of three waveguides W1K A wherein the air holes have of different normalized radii respectively r1/a=0.44, r2/a=0.288 and r3/a= 0.3292 (a: is the periodicity of the lattice with value 0.48 μm). Best response is obtained when we insert three small cylindrical cavities (with normalized radius of 0.17) between the two half-planes of photonic crystal strong lateral confinement.
Volume: 7
Issue: 4
Page: 1833-1838
Publish at: 2017-08-01

A Novel Control Strategy Based Dynamic Voltage Restorer for Compensation of Voltage Harmonics in Distribution System

10.11591/ijeecs.v7.i2.pp338-347
Syed Suraya , P. Sujatha P , Bharat Kumar. P
Power quality is one of the areas that the power sector is worried about. Power quality is the measure of practical system resemblance to ideal system. Voltage quality can be defined as the maintenance of voltage waveform shape close to ideal shape with proper magnitude and frequency. Even a slight change in voltage of the system can cause serious damage to the power system. Sensitive loads cannot adjust for small change in voltage. This paper presents Dynamic Voltage Restorer (DVR) for voltage harmonic suppression along with sag/swell compensation in distribution system. DVR is a voltage source converter which sends compensating signals when operated through switches of voltage source converter. This paper presents a novel control strategy to control DVR to block out the voltage harmonics in distribution system. The models and results are developed using MATLAB/SIMULINK software and comparative analysis of source voltage harmonics and load voltage harmonics during sag/swell compensation was tabulated.
Volume: 7
Issue: 2
Page: 338-347
Publish at: 2017-08-01

Performance Evaluation of Automatic Number Plate Recognition on Android Smartphone Platform

10.11591/ijece.v7i4.pp1973-1982
Teddy Surya Gunawan , Abdul Mutholib , Mira Kartiwi
Automatic Number Plate Recognition (ANPR) is an intelligent system which has the capability to recognize the character on vehicle number plate. Previous researches implemented ANPR system on personal computer (PC) with high resolution camera and high computational capability. On the other hand, not many researches have been conducted on the design and implementation of ANPR in smartphone platforms which has limited camera resolution and processing speed. In this paper, various steps to optimize ANPR, including pre-processing, segmentation, and optical character recognition (OCR) using artificial neural network (ANN) and template matching, were described. The proposed ANPR algorithm was based on Tesseract and Leptonica libraries. For comparison purpose, the template matching based OCR will be compared to ANN based OCR. Performance of the proposed algorithm was evaluated on the developed Malaysian number plates’ image database captured by smartphone’s camera. Results showed that the accuracy and processing time of the proposed algorithm using template matching was 97.5% and 1.13 seconds, respectively. On the other hand, the traditional algorithm using template matching only obtained 83.7% recognition rate with 0.98 second processing time. It shows that our proposed ANPR algorithm improved the recognition rate with negligible additional processing time.
Volume: 7
Issue: 4
Page: 1973-1982
Publish at: 2017-08-01

High Resolution Method using Patch Circular Array

10.11591/ijece.v7i4.pp2116-2124
Mohammed Amine Ihedrane , Seddik Bri , El Fadl Adiba
Smart antennas have recently received increasing for improving the performance of wireless radio systems. In this research article, we have used a patch antenna using uniform circular arrays (UCA) with central element for direction of arrival (DOA). A central element was added to arrays in order to increase steering capability of the proposed array. This geometry is used to determine the elevation and azimuth based on two famous algorithms of high resolution method: Matrix Pencil method (MP) and MUltiple Signal Classification (MUSIC).The comparison results demonstrate clearly that the matrix pencil is more accurate and stable to estimation of direction of arrival compared to the MUSIC algorithm.
Volume: 7
Issue: 4
Page: 2116-2124
Publish at: 2017-08-01

A Proposal for End-to-End QoS Provisioning in Software-Defined Networks

10.11591/ijece.v7i4.pp2261-2277
Francesco Lucrezia , Guido Marchetto , Fulvio Risso , Michele Santuari , Matteo Gerola
This paper describes a framework application for the control plane of a network infrastructure; the objective is to feature end-user applications with the capability of requesting at any time a customised end-to-end Quality-of-Service profile in the context of dynamic Service-Level-Agreements. Our solution targets current and future real-time applications that require tight QoS parameters, such as a guaranteed end-to-end delay bound. These applications include, but are not limited to, health-care, mobility, education, manufacturing, smart grids, gaming and much more. We discuss the issues related to the previous Integrated Service and the reason why the RSVP protocol for guaranteed QoS did not take off. Then we present a new signaling and resource reservation framework based on the cutting-edge network controller ONOS.  Moreover, the presented system foresees the need of considering the edges of the network, where terminal applications are connected to, to be piloted by distinct logically centralised controllers. We discuss a possible inter-domain communication mechanism to achieve the end-to-end QoS guarantee.
Volume: 7
Issue: 4
Page: 2261-2277
Publish at: 2017-08-01

Thermal and Electrical Study for PV Panel With Cooling

10.11591/ijeecs.v7.i2.pp492-499
Z. Syafiqah , Y.M. Irwan , N.A.M. Amin , M. Irwanto , W.Z. Leow , A.R. Amelia
Paper presents an investigation on photovoltaic (PV) panel with a direct-current (DC) fan cooling system. The DC fan cooling system was installed at the back of PV panel in order to reduce its operating temperature. The performance of PV panel can be affected with the increase of its operating temperature. Therefore, with the aid of the DC fan cooling system, it can enhance the performance by raise the output power generated. However, DC fan cooling system is considered as an active cooling system, whereby it consumes input power in operating it. The thermal behavior of PV panel with different DC fan speeds were observed by using a computational fluid dynamic (CFD) software. From the temperature obtained, a current-Voltage (I-V) and power-voltage (P-V) can be formed by using PSPICE due to examine its electrical performance. As the DC fan speed increases, the power input to operate it also increase. Hence, it is crucial to find the optimum speed so that the power generated by PV panel that can be saved is high.
Volume: 7
Issue: 2
Page: 492-499
Publish at: 2017-08-01

Unimodal Multi-Feature Fusion and one-dimensional Hidden Markov Models for Low-Resolution Face Recognition

10.11591/ijece.v7i4.pp1915-1922
Othmane El Meslouhi , Zineb Elgarrai , Mustapha Kardouchi , Hakim Allali
The objective of low-resolution face recognition is to identify faces from small size or poor quality images with varying pose, illumination, expression, etc. In this work, we propose a robust low face recognition technique based on one-dimensional Hidden Markov Models. Features of each facial image are extracted using three steps: firstly, both Gabor filters and Histogram of Oriented Gradients (HOG) descriptor are calculated. Secondly, the size of these features is reduced using the Linear Discriminant Analysis (LDA) method in order to remove redundant information. Finally, the reduced features are combined using Canonical Correlation Analysis (CCA) method. Unlike existing techniques using HMMs, in which authors consider each state to represent one facial region (eyes, nose, mouth, etc), the proposed system employs 1D-HMMs without any prior knowledge about the localization of interest regions in the facial image. Performance of the proposed method will be measured using the AR database.
Volume: 7
Issue: 4
Page: 1915-1922
Publish at: 2017-08-01

Concurrent Quad-band Low Noise Amplifier (QB-LNA) using Multisection Impedance Transformer

10.11591/ijece.v7i4.pp2061-2070
Teguh Firmansyah , Anggoro Suryo Pramudyo , Siswo Wardoyo , Romi Wiryadinata , Alimuddin Alimuddin
A quad-band low noise amplifier (QB-LNA) based on multisection impedance transformer designed and evaluated in this research. As a novelty, a multisection impedance transformer was used to produce QB-LNA. A multisection impedance transformer is used as input and output impedance matching because it has higher stability, large Q factor, and low noise than lumpedcomponent.The QB-LNA was designed on FR4 microstrip substrate with er= 4.4, thickness h=0.8 mm, and tan d= 0.026. The proposed QB-LNA was designed and analyzed by Advanced Design System (ADS).The simulation has shown that QB-LNA achieves gain (S21) of 22.91 dB, 16.5 dB,  11.18 dB, and 7.25 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively.The QB-LNA obtainreturn loss (S11) of -21.28 dB, -31.87 dB,  -28.08 dB, and -30.85 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively. It also achieves a noise figure (nf) of 2.35 dB, 2.13 dB, 2.56 dB, and 3.55 dB at 0.92 GHz, 1.84 GHz, 2.61 GHz, and 3.54 GHz, respectively. This research also has shown that the figure of merit (FoM) of the proposed QB-LNA is higher than that of another multiband LNA.
Volume: 7
Issue: 4
Page: 2061-2070
Publish at: 2017-08-01

Survey of Hybrid Image Compression Techniques

10.11591/ijece.v7i4.pp2206-2214
Emy Setyaningsih , Agus Harjoko
A compression process is to reduce or compress the size of data while maintaining the quality of information contained therein. This paper presents a survey of research papers discussing improvement of various hybrid compression techniques during the last decade. A hybrid compression technique is a technique combining excellent properties of each group of methods as is performed in JPEG compression method. This technique combines lossy and lossless compression method to obtain a high-quality compression ratio while maintaining the quality of the reconstructed image. Lossy compression technique produces a relatively high compression ratio, whereas lossless compression brings about high-quality data reconstruction as the data can later be decompressed with the same results as before the compression. Discussions of the knowledge of and issues about the ongoing hybrid compression technique development indicate the possibility of conducting further researches to improve the performance of image compression method.
Volume: 7
Issue: 4
Page: 2206-2214
Publish at: 2017-08-01
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