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28,451 Article Results

Noise Characterization in InAlAs/InGaAs/InP pHEMTs for Low Noise Applications

10.11591/ijece.v7i1.pp176-183
Z. A. Djennati , K. Ghaffour
In this paper, a noise revision of an InAlAs/InGaAs/InP psoeudomorphic high electron mobility transistor (pHEMT) in presented. The noise performances of the device were predicted over a range of frequencies from 1GHz to 100GHz. The minimum noise figure (NFmin), the noise resistance (Rn) and optimum source impedance (Zopt) were extracted using two approaches. A physical model that includes diffusion noise and G-R noise models and an analytical model based on an improved PRC noise model that considers the feedback capacitance Cgd. The two approaches presented matched results allowing a good prediction of the noise behaviour. The pHEMT was used to design a single stage S-band low noise amplifier (LNA). The LNA demonstrated a gain of 12.6dB with a return loss coefficient of 2.6dB at the input and greater than -7dB in the output and an overall noise figure less than 1dB.
Volume: 7
Issue: 1
Page: 176-183
Publish at: 2017-02-01

Gain Flatness and Noise Figure Optimization of C-Band EDFA in 16-channels WDM System using FBG and GFF

10.11591/ijece.v7i1.pp289-298
Chakkour Mounia , Aghzout Otman , Ait Ahmed Badiaa , Chaoui Fahd , Alejos Ana Vazquez , El Yakhloufi Mounir
In this paper, Gain Flatness and Noise Figure of Erbium Doped Fiber Amplifier (EDFA) have been investigated in 16-channels Wavelength Division Multiplexing (WDM). Fiber Bragg Grating (FBG) is used in C-band with the aim to achieve flat EDFA output gain. The proposed model has been studied in detail to evaluate and to enhance the performance of the transmission system in terms of gain, noise figure and eye diagram of the received signals. To that end, various design parameters have been investigated and optimized, such as frequency spacing, EDF length and temperature. To enhance the transmission system performance in terms of gain flatness, the Gain Flattening Filter (GFF) has been introduced in the design. To prove the efficiency of the new design, the optical transmission system with optimized design parameters has been compared with a previous works in the literature. The simulation results show satisfactory performance with quasi-equalized gain for each channel of the WDM transmission system.
Volume: 7
Issue: 1
Page: 289-298
Publish at: 2017-02-01

Indonesian Culture Learning Application based on Android

10.11591/ijece.v7i1.pp526-535
Alexander Setiawan , Andreas Handojo , Rendra Hadi
Indonesia is a country that has a wealth of diverse cultures spread from Sabang to Merauke. Even though the government has included a lesson about Indonesian culture in terms of some subjects such as Art and Culture, but there are still many people including some students who do not know the forms and names of the tribes, traditional houses, traditional clothing, folk songs, traditional foods, local weapons, and musical instruments regions in Indonesia. Therefore, a learning application is created that utilizes mobile learning technology. Through the use of mobile learning, user can access learning content without any borders so that it can be accessed at any time so that it can be accessed at any time with interesting illustration. Indonesia National Culture Application is made useful to help users in learning the introduction of Indonesian culture that provides the knowledge with illustrations in the form of images, audio, text and video. This application also can be functioned to learn, answer quiz, to view a gallery of images and video and to do puzzle games. The achieved result is an application that can provide knowledge to the users so they can know the culture in Indonesia through the illustrations provided well.
Volume: 7
Issue: 1
Page: 526-535
Publish at: 2017-02-01

Nonlinear Compensation Empyoing Matrix Converter with DTC Controller

10.11591/ijece.v7i1.pp107-124
Khalaf S. Gaied , Ziad H. Salih , Ahmed R. Ajel , Mehdi J. Marie
This paper describes a nonlinear harmful speed and torque controller for fourth order induction motor model. The investigation of optimality and cost function for that base on estimation of Hammerstein-Wiener model with the compensated mathematical model. The matrix converter with direct torque control combination is efficient way to get better performance specifications in the industry.The MC and the DTC advantages are combined together.The reduction of complexity and cost of DC link in the DTC since it has no capacitors in the circuit. However, the controlling torque is a big problem it in DTC because of high ripple torque production which results in vibrations response in the operation of the IM as it has no PID to control the torque directly. The combination of MC with DTC is applied to reduce the fluctuation in the output torque and minimize the steady state error. This paper presents the simulation analysis of induction machine drives using Maltlab/Simulink toolbox R2012a. Design of constant switching frequency MCDTC drive,stability investigation and fault protection as well as controllability and observability with minimum steady state error has been carried out which  proved the effectiveness of the proposed technique.
Volume: 7
Issue: 1
Page: 107-124
Publish at: 2017-02-01

Novel High-Gain Narrowband Waveguide-Fed Filtenna using Genetic Algorithm

10.11591/ijece.v7i1.pp253-259
Mahdi Ghorbani , Habib Ghorbaninejad
Filtenna is an antenna with filtering feature. There are many ways to design a filtenna. In this paper, a high-gain narrowband waveguide-fed aperture filtenna has been proposed and designed. A patterned plane, which is designed using genetic algorithm has been used at the open end of the waveguide fed, mounted on a conducting ground plane. To design the patterned pattern, magnetic field integral equation of the structure has been derived, so it has been solved using method of moments. The proposed filtenna has been simulated with HFSS that confirms the results obtained by method of moments. Finally, an unprinted dielectric as a superstrate has been used to enhance the gain of the filtenna. The filtenna bandwidth is 1.76% (160 MHz)  which has the gain of 15.91 dB at the central frequency of 9.45 GHz.
Volume: 7
Issue: 1
Page: 253-259
Publish at: 2017-02-01

MeMLO: Mobility-Enabled Multi-Level Optimization Sensor Network

10.11591/ijece.v7i1.pp374-382
M.C. Rajalakshmi , A.P. Gnana Prakash
The paper presents a technique called as Mobility-enabled Multi Level Optimization (MeMLO) that addressing the existing problem of clustering in wireless sensor net-work (WSN). The technique enables selection of aggregator node based on multiple optimi-zation attribute which gives better decision capability to the clustering mechanism by choosing the best aggregator node. The outcome of the study shows MeMLO is highly capable of minimizing the halt time of mobile node that significantly lowers the transmit power of aggregator node. The simulation outcome shows negligible computational com-plexity, faster response time, and highly energy efficient for large scale WSN for longer simulation rounds as compared to conventional LEACH algorithm.
Volume: 7
Issue: 1
Page: 374-382
Publish at: 2017-02-01

Reliability Evaluation and Analysis of Mobile Ad Hoc Networks

10.11591/ijece.v7i1.pp479-485
Deepak Kumar Panda , Ranjan Kumar Dash
The paper addresses the reliability problem of mobile ad hoc networks under link and node failure model. Node reliability is calculated as a function of no. of neighbor nodes, packet success rate, and device type and packet size. The presence of a link between any node pair is binary and its reliability is computed considering the distance between nodes and signal-to-noise ratio (SNR). An efficient algorithm is proposed to analyze and calculate the reliability of mobile ad hoc networks considering multiple routes from source and destination nodes. The effect of different parameters on node reliability and link reliability are analyzed and discussed. The network is simulated and analyzed using INET frame work. Reliability of two distinct cases of this simulation is evaluated. The simulated results and discussions ensure that evaluation of the reliability of any mobile ad hoc networks can be done easily and in an efficient manner by the proposed method.
Volume: 7
Issue: 1
Page: 479-485
Publish at: 2017-02-01

Sensoring Leakage Current to Predict Pollution Levels to Improve Transmission Line Model via ANN

10.11591/ijece.v7i1.pp68-76
Saraa I. Khalel , Mohd Fadli Rahmat , Mohd Wazir Bin Mustafa
Pollution insulator is a serious threat to the safety operations of electric power systems. Leakage current detection is widely employed in transmission line insulators to assess pollution levels. This paper presents the prediction of pollution levels on insulators based on simulated leakage current and voltage in a transmission tower.The simulation parameters are based on improved transmission line model with leakage current resistance insertion between buses. Artificial neural network (ANN) is employed to predict the level of pollution with different locations of simulated leakage current and voltage between two buses. With a sufficient number of training, the test results showed a significant potential for pollution level prediction with more than 95% Correct Classification Rate (CCR) and output of the ANN showed high agreement with Simulink results.
Volume: 7
Issue: 1
Page: 68-76
Publish at: 2017-02-01

A Survey on Block Matching Algorithms for Video Coding

10.11591/ijece.v7i1.pp216-224
Adapa Venkata Paramkusam , Vuyyuru Arun
Block matching algorithm (BMA) for motion estimation (ME) is the heart to many motion-compensated video-coding techniques/standards, such as ISO MPEG-1/2/4 and ITU-T H.261/262/263/264/265, to reduce the temporal redundancy between different frames. During the last three decades, hundreds of fast block matching algorithms have been proposed. The shape and size of search patterns in motion estimation will influence more on the searching speed and quality of performance. This article provides an overview of the famous block matching algorithms and compares their computational complexity and motion prediction quality.
Volume: 7
Issue: 1
Page: 216-224
Publish at: 2017-02-01

Sensing Trending Topics in Twitter for Greater Jakarta Area

10.11591/ijece.v7i1.pp330-336
Angga Pratama Sitorus , Hendri Murfi , Siti Nurrohmah , Afif Akbar
Information and communication technology grows so fast nowadays, especially related to the internet. Twitter is one of internet applications that produce a large amount of textual data called tweets. The tweets may represent real-world situation discussed in a community. Therefore, Twitter can be an important media for urban monitoring. The ability to monitor the situations may guide local government to respond quickly or make public policy. Topic detection is an important automatic tool to understand the tweets, for example, using non-negative matrix factorization. In this paper, we conducted a study to implement Twitter as a media for the urban monitoring in Jakarta and its surrounding areas called Greater Jakarta. Firstly, we analyze the accuracy of the detected topics in term of their interpretability level. Next, we visualize the trend of the topics to identify popular topics easily. Our simulations show that the topic detection methods can extract topics in a certain level of accuracy and draw the trends such that the topic monitoring can be conducted easily.
Volume: 7
Issue: 1
Page: 330-336
Publish at: 2017-02-01

Scalability Aware Energy Consumption and Dissipation Models for Wireless Sensor Networks

10.11591/ijece.v7i1.pp424-431
Mohamed El Fissaoui , Said Benkirane , Abderrahim Beni-Hssane , Mostafa Saadi
Most of Wireless Sensor Networks researches focus on reducing the amount of energy consumed by nodes and network to increase the network lifetime. Thus, several papers have been presented and published to optimize energy consumption in each area of WSNs, such as routing, localization, coverage, security, etc. To test and evaluate their propositions, authors apply an energy dissipation model; this model must be more realistic and suitable to give good results. In this paper we present a general preview on different sources of energy consumption in wireless sensor networks, and provide a comparative study between two energy models used in WSNs that offer an effective and an adequate tool for researchers.
Volume: 7
Issue: 1
Page: 424-431
Publish at: 2017-02-01

Generalized Transformed Hough: Segmentation of Contours in Angiographic Images

10.11591/ijeecs.v5.i2.pp345-351
Oscar Eduardo Gualdron
The morphologic and functional study of cardiovascular system is of vital importance because problems related to this system are one of the main causes of   mortality in the world. It is important to mention that the left ventricle (VI) is the most susceptible to suffer severe damage, in diseases, such as arterial hypertension, mellitus diabetes or arteriosclerosis. This article presents a new methodology directed to segmentation of left ventricular contours, in angiographic images by using Generalized Hough Transform (TGH). It is important to obtain the ventricular edge, because analyzing processes of systole and diastole end, it is possible to calculate parameters of the cardiac functionality as the end-diastolic volume, end systolic volume, ejection fraction, cardiac output, Hyperkinéticos, Hypokinéticos segments, and normal; in this work we focus only on the removal of the same.
Volume: 5
Issue: 2
Page: 345-351
Publish at: 2017-02-01

An Improved Detection and Classification Technique of Harmonic Signals in Power Distribution by Utilizing Spectrogram

10.11591/ijece.v7i1.pp12-20
M.H. Jopri , A.R. Abdullah , M. Manap , M.R. Yusoff , T. Sutikno , M.F. Habban
This paper introduces an improved detection and classification technique of harmonic signals in power distribution using time-frequency distribution (TFD) analysis which is spectrogram.  The spectrogram is an appropriate approach to signify signals in jointly time-frequency domain and known as time frequency representation (TFR). The spectral information of signals can be observed and estimated plainly from TFR due to identify the characteristics of the signals. Based on rule-based classifier and the threshold settings that referred to IEEE Standard 1159 2009, the detection and classification of harmonic signals for 100 unique signals consist of various characteristic of harmonics are carried out successfully. The accuracy of proposed method is examined by using MAPE and the result show that the technique provides high accuracy. In addition, spectrogram also gives 100 percent correct classification of harmonic signals. It is proven that the proposed method is accurate, fast and cost efficient for detecting and classifying harmonic signals in distribution system.
Volume: 7
Issue: 1
Page: 12-20
Publish at: 2017-02-01

Effect of Mobility on (I-V) Characteristics of Gaas MESFET

10.11591/ijece.v7i1.pp169-175
M Azizi , C Azizi
We present in this paper an analytical model of the current–voltage (I-V) characteristics for submicron GaAs MESFET transistors. This model takes into account the analysis of the charge distribution in the active region and incorporate a field depended electron mobility, velocity saturation and charge build-up in the channel. We propose in this frame work an algorithm of simulation based on mathematical expressions obtained previously. We propose a new mobility model describing the electric field-dependent. The predictions of the simulator are compared with the experimental data [01] and have been shown to be good.
Volume: 7
Issue: 1
Page: 169-175
Publish at: 2017-02-01

Symmetric Key based Encryption and Decryption using Lissajous Curve Equations

10.11591/ijece.v7i1.pp285-288
Santhosh Kumar B.J. , Kruthika Vijay
Sender and receiver both uses two large similar prime numbers and uses parametric equations for swapping values of kx and by product of kx and ky is the common secret key. Generated secret key is used for encryption and decryption using ASCII key matrix of order 16X16. Applying playfair rules for encryption and decryption. Playfair is a digraph substitution cipher. Playfair makes use of pairs of letters for encryption and decryption. This application makes use of all ASCII characters which makes brute force attack impossible.
Volume: 7
Issue: 1
Page: 285-288
Publish at: 2017-02-01
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