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27,404 Article Results

Security against Timing Analysis Attack

10.11591/ijece.v5i4.pp759-764
Deevi Radha Rani , S Venkateswarlu
Timing attack is the type of side-channel attack involves the time taken to complete critical operations. Securing crypto processor from timing attack is critical issue. This paper implements the Bernstein’s Timing Attack and timing attack based on hamming weight. The countermeasures of Bernstein’s Timing attack are implemented in our experimental test bed and their performance is compared.  This paper also proposes the key recovery method based on timing attack using hamming weight of the key.
Volume: 5
Issue: 4
Page: 759-764
Publish at: 2015-08-01

Investigation of Dependent Rikitake System to Initiation Point

10.11591/ijape.v4.i2.pp70-76
Yousof Gholipour , Amin Ramezani , Mahmood Mola
In this paper we investigate depending of the Rikitake system to initiation point, and monitor changing behavior of this system. We will have 4 initiation points in Cartesian system. We at 4 positions, will monitor behavior of this system, while holding constant other values, and after per position, will draw operation of system on axes of x, y, z and 3-D plot. We want to know, what is the effect of initiation point on Rikitake system? Numerical simulations to illustrate the effect of initiation point are presented, and at the end conclusions and comparing the states together are obtained.
Volume: 4
Issue: 2
Page: 70-76
Publish at: 2015-08-01

Distributed MPP Tracking of PV through Buck Converter Using Fuzzy

10.11591/ijeecs.v15.i2.pp197-208
Chandani Sharma , Anamika Jain
Photovoltaics (PV) are the most abundant, perennial, environment friendly and distributed source of energy all over the globe. In this paper, the method to increase PV extraction efficiency for 60W panel with improved DMPP (Distributed Maximum Power Point) even on changing temperature and irradiance have been mapped and discussed. In order to achieve this, the components and subsystems have been analyzed and validated. The validated models are used to maximize the power output using two different models of DC-DC Converters in MATLAB/SIMULINK environment. Closed loop Buck converter using state space nonlinear differential equations and direct component model are compared to reveal best results at Standard Test Conditions (STC). MPPT model developed can be used for obtaining maximum power output from PV even in partial presence of sun using Fuzzy Logic Controller. The Controller designed tracks highest power output for the buck converter. The model developed, using tested membership functions in FLC, can serve a platform for various real time applications using PV.
Volume: 15
Issue: 2
Page: 197-208
Publish at: 2015-08-01

Underwater Target Tracking Using Unscented Kalman Filter

10.11591/ijape.v4.i2.pp77-83
M. Nalini Santhosh , S. Koteswara Rao , R.P. Das
Unlike conventional active sonar, that transmits the sound signals and revealing their presence and position to enemy forces. The probable advantage of passive sonar is that it detects the signals emitted by the target, leads to improve localization, target tracking, and categorization. The challenging aspect is to estimate the true bearing and frequency measurements from the noisy measurements of the target. Here in this paper, it is recommended for the Unscented Kalman Filter (UKF) to track the target by using these noisy measurements. The Target Motion Analysis (TMA), which is the way to find the target’s trajectory by using frequency and bearing measurements, is explored. This method provides a tactical advantage over the classical bearing only tracking target motion analysis. It makes the observer maneuver unnecessary.
Volume: 4
Issue: 2
Page: 77-83
Publish at: 2015-08-01

Effects of the Droop Speed Governor and Automatic Generation Control AGC on Generator Load Sharing of Power System

10.11591/ijape.v4.i2.pp84-95
Youssef Mobarak
In power system, as any inequality between production and consumption results in an instantaneous change in frequency from nominal, frequency should be always monitored and controlled. Traditionally, frequency regulation is provided by varying the power output of generators which have restricted ramp rates. The Automatic Generation Control AGC process performs the task of adjusting system generation to meet the load demand and of regulating the large system frequency changes. A result of the mismatches between system load and system generation, system frequency and the desired value of 50 Hz is the accumulation of time error. How equilibrium system frequency is calculated if load parameters are frequency dependent, and how can frequency be controlled. Also, how do parameters of a speed governor affect generated power. The transient processes before system frequency settles down to steady state. Finally, AGC in what way is it different from governor action. This paper presents new approaches for AGC of power system including two areas having one steam turbines and one hydro turbine tied together through power lines.
Volume: 4
Issue: 2
Page: 84-95
Publish at: 2015-08-01

Gabor-HOG Features based Face Recognition Scheme

10.11591/ijeecs.v15.i2.pp331-335
Hamid Ouanan , Mohammed Ouanan , Brahim Aksasse
Extraction of invariant features is the core of Face RecognitionSystems (FRS). This work proposes a novel feature extractor-fusion scheme using two powerful feature descriptor known as Gabor Filters (GFs) and Histogram of Oriented Gradient (HOG), which the face image is filtered with the multiscale multiresolution Gabor filter bank to generate multiple Gabor magnitude images (GMIs), then the down-sampled GMIs and apply Histogram of Oriented Gradient to form the features. The experimental results on the FERET face database show the effectiveness of our methods.
Volume: 15
Issue: 2
Page: 331-335
Publish at: 2015-08-01

DSS using AHP in Selection of Lecturer

10.11591/ijict.v4i2.pp79-85
Adriyendi Adriyendi , Yeni Melia
This paper was conducted to apply Analytical Hierarcy Process (AHP), applied as Decision Support System (DSS) model in selection of lecturer at STAIN Batsangkar. Data collected by through observation and interview done in shares of administration academic data center at college. Here in  data analyzed to learn the pattern from method used and added with the reference from literature. Experiment done using Microsoft Excel and Expert Choice Software, known that method can yield the optimal decision in selection of lecturer. There by the method recommended to be applied to getting optimal result in decision making.
Volume: 4
Issue: 2
Page: 79-85
Publish at: 2015-08-01

Circularly Polarized Rectangular Microstrip Patch Antenna with Finite Ground Plane

10.11591/ijict.v4i2.pp74-78
Sanyog Rawat , Kamlesh Kumar Sharma
In this paper a new geometry of patch antenna is proposed with improved bandwidth and circular polarization. The radiation performance of circularly polarized rectangular patch antenna is investigated by applying IE3D simulation software and its performance is compared with that of conventional rectangular patch antenna. Finite Ground truncation technique is used to obtain the desired results. The simulated return loss, axial ratio and smith chart with frequency for the proposed antenna is reported in this paper. It is shown that by selecting suitable ground-plane dimensions, air gap and location of the slits, the impedance bandwidth can be enhanced upto 10.15 % as compared to conventional rectangular patch (4.24%) with an axial ratio bandwidth of 4.05%.  
Volume: 4
Issue: 2
Page: 74-78
Publish at: 2015-08-01

Two Level Clustering for Quality Improvement using Fuzzy Subtractive Clustering and Self-Organizing Map

10.11591/ijeecs.v15.i2.pp373-380
Erick Alfons Lisangan , Aina Musdholifah , Sri Hartati
Recently, clustering algorithms combined conventional methods and artificial intelligence. FSC-SOM is designed to handle the problem of SOM, such as defining the number of clusters and initial value of neuron weights. FSC find the number of clusters and the cluster centers which become the parameter of SOM. FSC-SOM is expected to improve the quality of FSC since the determination of the cluster centers are processed twice i.e. searching for data with high density at FSC then updating the cluster centers at SOM. FSC-SOM was tested using 10 datasets that is measured with F-Measure, entropy, Silhouette Index, and Dunn Index. The result showed that FSC-SOM can improve the cluster center of FSC with SOM in order to obtain the better quality of clustering results. The clustering result of FSC-SOM is better than or equal to the clustering result of FSC that proven by the value of external and internal validity measurement.
Volume: 15
Issue: 2
Page: 373-380
Publish at: 2015-08-01

Phonemes Classification Using the Spectrum

10.11591/ijeecs.v15.i2.pp368-372
Ahmed El Ghazi , Cherki Daoui
In this work, we present an automatic speech classification system for the Tamazight phonemes. We based on the spectrum presentation of the speech signal to model these phonemes. We have used an oral database of Tamazight phonemes. To test the system’s performances, we calculate the classification rate. The obtained results are satisfactory in comparison with the reference database and the quality of speech files.
Volume: 15
Issue: 2
Page: 368-372
Publish at: 2015-08-01

Software Based Approach for teaching in Electrical Engineering Classroom Courses: a Case Study

10.11591/ijeecs.v15.i2.pp361-367
Hemant Mehar
As the day by day changes in the technology, technical requirements and techniques of the industry changes simultaneously. Therefore the requirements to educate our students not only the conceptual as well as new approaches based on the latest techniques. Involvement of software in teaching is not only providing a better support, more clear and visual operation of complex circuits and waveforms of the faculty of power electronics in classroom teaching as well as to the student to understand a better concept. The software packages available for simulation of power electronic circuits are MATLAB, PSPICE and PSIM and many more. In this paper author takes an example of an AC voltage controller to explain the software based teaching approach. Author used two software based simulation tool to explain the AC Voltage Controller and compare the software based approach with the blackboard & PPT Presentation based technique. This paper is helpful for the faculty of electrical engineering to find the applications of MATLAB/SIMULINK and PSIM in teaching.
Volume: 15
Issue: 2
Page: 361-367
Publish at: 2015-08-01

Isolated Handwritten Eastern Arabic Numerals Recognition Using Support Vectors Machines

10.11591/ijeecs.v15.i2.pp346-351
B. El Kessab , C. Daoui , B. Bouikhalene , R. Salouan
In this paper, we present a comparison between the different variations of virtual retina (grid size) in features extraction with the support vectors machines classifier for isolated handwritten Eastern Arabic numerals recognition. For this purpose we have used for pre-processing each numeral image the median filter, the thresholding, normalization and the centering techniques. Furthermore, the experements results that we have obtained demonstrate really that the most powerful method is that virtual retina size equal 20x20. This work has achieved approximately 85% of success rate for Eastern Arabic numerals database identification.
Volume: 15
Issue: 2
Page: 346-351
Publish at: 2015-08-01

Real-time Colorized Video Images Optimization Method in Scotopic Vision

10.11591/ijeecs.v15.i2.pp321-330
Chen Yong , Shuai Feng , Zhan Di
In low light environment, the surveillance video image has lower contrast，less information and uneven brightness. To solve this problem, this paper puts forward a contrast resolution compensation algorithm based on human visual perception model. It extracts Y component from the YUV video image acquired by camera originally to subtract contrast feature parameters, then makes a proportional integral type contrast resolution compensation for low light pixels in Y component and makes index contrast resolution compensation for high light pixels adaptively to enhance brightness of the video image while maintains the U and V components. Then it compresses the video images and transmits them via internet. Finally, it decodes and displays the video image on the device of intelligent surveillance system. The experimental results show that, the algorithm can effectively improve the contrast resolution of the video image and maintain the color of video image well. It also can meet the real-time requirement of video monitoring.
Volume: 15
Issue: 2
Page: 321-330
Publish at: 2015-08-01

Performance Evaluation of Broad Band CDMA Signal Using Beam Forming Antenna Technology for Next Generation Communications

10.11591/ijict.v4i2.pp45-55
Javaid A Sheikh
In order to accommodate various multimedia services, next generation wireless networks are characterized by very high transmission rates. Thus, in such systems and networks, the received signal is not only limited by noise like Additive White Gaussian noise (AWGN) but especially with increasing data transmission rate by the Intersymbol Symbol Interference (ISI) due to time dispersion of channel. A number of techniques such as rake receiver in CDMA systems and equalizers in GSM systems have been proposed to combat the effect of fading so as to improve the performance of wireless communication network.  In this paper we evolve the performance of uncoded uplink transmission in broadband CDMA using beam forming technique under multipath conditions. The beam-former has been implemented using Transport Delay Line (TDL) filters.  An expression for the optimal weights of a TDL based beam former has been derived.  A carrier frequency of 2 Ghz has been used in this work as they are useful for next generation wireless systems.  Simulation results show that TDL beamformer can reduce the multipath fading and Multiple Access Interferance (MAI). It has been shown that if SNR (related with Variance of the channel) is maintained at 10 db and if a 3 ray based beamformer having 3 antennas with 3 taps is used, the Error Rate of 0.1was found without using channel coding.
Volume: 4
Issue: 2
Page: 45-55
Publish at: 2015-08-01

Flight-Path Tracking Control of an Aircraft Using Backstepping Controller

10.11591/ijeecs.v15.i2.pp270-276
Labane Chrif , Zemalache Meguenni Kada , Tahar Mohamed
For transportation aircraft, the primary control objective for an autopilot system engaged during approach and landing is relative to the flight path tracking on the basis of highly simplified linear models of flight dynamics. The dynamics governing the flight path of an aircraft are in general highly nonlinear and involve complex physics for which no accurate models are available. In this paper a nonlinear model describing the longitudinal equations of motion in strick feedback form is derived. Backstepping is utilized for the construction of a globally stabilizing controller with a number of free parameters. It is implemented a controller with an internal loop controls involving the pitch rate of the aircraft and an external loop which includes angle of attack, path angle and pitch angle. Finally, nonlinear simulation results for a longitudinal model of a transportation aircraft are displayed and discussed.
Volume: 15
Issue: 2
Page: 270-276
Publish at: 2015-08-01
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