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25,002 Article Results

Chaotic Binary Modulation Excitation Sequences for Multichannel Ultrasonic Ranging System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3939
Zhenjing Yao , Jingsong Yang
A crosstalk elimination method by using the optimal binary excitation sequences modulated with chaotic codes, which includes chaotic binary amplitude shift keying (c-BASK), chaotic binary phase shift keying (c-BPSK) and chaotic binary frequency shift keying (c-BFSK), is proposed in this paper. The selection of the optimal chaotic initial values with the best echo correlation characteristics is realized by adopting a genetic algorithm. A square wave is used as the carrier of the chaotic binary modulation methods in order to reduce hardware cost. However, it could suffer from the decreased energy efficiency caused by mismatching spectrum with ultrasonic ranging system. The parameters of the chaotic binary modulation methods are configured to make their central frequency and bandwidth matched with that of the ultrasonic ranging system very well. Experiments have been conducted using an ultrasonic ranging system that consists of eight-channel SensComp 600 series instrument-grade electrostatic sensors excited with chaotic binary sequences. Experimental results show that the c-BFSK outperforms the c-BASK and c-BPSK in terms of the energy efficiency, e.g., 0.3508  vs. 0.3365  and 0.3279 , respectively. And the optimized c-BFSK sequence also has the best echo correlation characteristics among the chaotic binary modulation sequences. http://dx.doi.org/10.11591/telkomnika.v12i12.4640 
Volume: 12
Issue: 12
Page: 8217-8228
Publish at: 2014-12-01

Body Mass Index can be a Good Predictor of Bone Mineral Density in Postmenopausal Women in India

10.11591/ijphs.v3i4.4703
Biplob Chowdhury , Brajanath Kundu
Risk factors for the prediction of osteoporosis are an important and cost effective method since osteoporosis is a silent disease. The purpose of the study was to evaluate the associations between weight, body mass index (BMI), the Osteoporosis Self-Assessment Tool (OST), and bone mineral density (BMD) in postmenopausal women in India. In this cross sectional study, 90 postmenopausal women aged 45–85 years who had given consent participated and the study was conducted between April, 2012 and May, 2013. BMD was measured by ultrasound bone densitometry at calcaneal site. Linear regression multivariate models were used to examine the associations with weight, BMI, OST, and BMD. Body weight, BMI, and OST had almost similar overall performance in their ability to classify women with BMD T-score ≤−2.5. Regression results showed that the linear combination of three independent variables BMI, OST and body weight. BMI predicted 65.7% of the variance in BMD, R2 = .657, R2 adjusted = .609, (F=21.295, p<.000). The strongest predictor of low BMD was BMI. BMI showed significant association with BMD with a correlation of .846. Low weight and BMI predict osteoporosis and are associated with increased risks in postmenopausal women. The negative impact of low body weight on bone health should be more widely recognized.
Volume: 3
Issue: 4
Page: 276-280
Publish at: 2014-12-01

Forgiveness, Gratitude, and Happiness among College Students

10.11591/ijphs.v3i4.4698
Triantoro Safaria
Wellbeing is the ultimate goal for everyone, not only for adolescence. Present study explore the relationship between gratitude and forgiveness with happiness among college student. A total of 81 undergarduate psychology students were recruited in this study from a private university in Jogjakarta. 29.6% (24) of the sample were males and 70.4% (57) were females Regression analysis was used to predict the model. This model regression predict relationship between gratitude and forgiveness with happiness, explaining 28.9% of the variance (Adjusted R2= 0.289).Gratitude give the biggest contribution to happiness (b= .536 p= .000), but forgiveness has no significance relationship to happiness (b= .078, p= .414). This result means that gratitude is an important factor contribute to happiness among undergraduate student in this sample. The implication of study are discussing further.
Volume: 3
Issue: 4
Page: 241-245
Publish at: 2014-12-01

Remote Controlling and Monitoring of Induction Motors Through Internet

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3918
Abdülkadir Çakir , Hakan Çalis , Gökhan Turan
Electric motors are workhorse of the industry. Induction motors are used more commonly than the other electric motors because of being low cost, robustness, and requiring less maintenance (especially squirrel-cage types), and able to work in harsh conditions. In this study, simultaneously remote powering of three separate single phase motors or one three-phase induction motor, when it is requested continuously remote data collection of motor currents, voltages, and remote monitoring of motor status are implemented. Moreover, preventing motors not running on low or high voltage conditions and allowing to run when the values return to nominal rates are provided. The design consists of PIC18F4620 microcontroller connected with ethernet board, sensor cards and control card. The developed software and HTML labels belonging to web interface are embedded in the microcontroller. The serial ethernet board contains HTML labels in its buffer memory. Thus, instead of using a separate host computer the serial ethernet board does the same hosting job. The remote powering of induction motors was done by the help of any device connecting to the internet with using an IP number assigned to the serial ethernet board. http://dx.doi.org/10.11591/telkomnika.v12i12.6719 
Volume: 12
Issue: 12
Page: 8051-8059
Publish at: 2014-12-01

Goal Detection in Soccer Video: Role-Based Events Detection Approach

https://ijece.iaescore.com/index.php/IJECE/article/view/5532
Farshad Bayat , Mohammad Shahram Moin , Farhad Bayat
Soccer video processing and analysis to find critical events such as occurrences of goal event have been one of the important issues and topics of active researches in recent years. In this paper, a new role-based framework is proposed for goal event detection in which the semantic structure of soccer game is used. Usually after a goal scene, the audiences’ and reporters’ sound intensity is increased, ball is sent back to the center and the camera may: zoom on Player, show audiences’ delighting, repeat the goal scene or display a combination of them. Thus, the occurrence of goal event will be detectable by analysis of sequences of above roles. The proposed framework in this paper consists of four main procedures: 1- detection of game’s critical events by using audio channel, 2- detection of shot boundary and shots classification, 3- selection of candidate events according to the type of shot and existence of goalmouth in the shot, 4- detection of restarting the game from the center of the field. A new method for shot classification is also presented in this framework. Finally, by applying the proposed method it was shown that the goal events detection has a good accuracy and the percentage of detection failure is also very low.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6377
Volume: 4
Issue: 6
Page: 979-988
Publish at: 2014-12-01

Application of Value Assessment Weights in Conservation of Modern Architectural Heritage

10.11591/ijeecs.v12.i12.pp8312-8318
Song Gang , Yang Changming , Hao Chen , Ran Yanping
This study presents the weights of various indicators in the integrated conservation of our modern architectural heritage. In the AHP (Analytic Hierarchy Process), the Delphi method and Entropy method are integrally adopted to set up the evaluation indicator system of the conservation efforts, and the weight coefficient of evaluation indicators. Through the analysis, we can find that modern architectural heritages not only have the three basic values historical, artistic and scientific values, but also have significant environmental，cultural emotional and real estate values. In the assessment system, artistic and historical values are the priorities among those first-level indicators, and the real estate value is the last one. Among the second-level indicators, representative architectural art is the most important factor. Consequently, the emphases should be placed on the artistic and historical values of modern architectural heritages.
Volume: 12
Issue: 12
Page: 8312-8318
Publish at: 2014-12-01

Wind Turbine Fault Detection System in Real Time Remote Monitoring

https://ijece.iaescore.com/index.php/IJECE/article/view/5504
Saad Chakkor , Mostafa Baghouri , Abderrahmane Hajraoui
In new energy development, wind power has boomed. It is due to theproliferation of wind parks and their operation in supplying the nationalelectric grid with low cost and clean resources. Hence, there is an increasedneed to establish a proactive maintenance for wind turbine machines based on remote control and monitoring. That is necessary with a real-time wireless connection in offshore or inaccessible locations while the wired method has many flaws. The objective of this strategy is to prolong wind turbine lifetime and to increase productivity. The hardware of a remote control and monitoring system for wind turbine parks is designed. It takes advantage of GPRS or Wi-Max wireless module to collect data measurements from different wind machine sensors through IP based multi-hop communication. Computer simulations with Proteus ISIS and OPNET software tools have been conducted to evaluate the performance of the studied system. Study findings show that the designed device is suitable for application in a wind park.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6479
Volume: 4
Issue: 6
Page: 882-892
Publish at: 2014-12-01

Developing Adaptive Cruise Control Based on Fuzzy Logic Using Hardware Simulation

https://ijece.iaescore.com/index.php/IJECE/article/view/5520
Noor Cholis Basjaruddin , Kuspriyanto Kuspriyanto , Didin Saefudin , Ilham Khrisna Nugraha
Ride comfort on the highway often interrupted because drivers need to adjust the vehicle speed. Safe distance between vehicles should be maintained is the main reason. The situation of monotonous and high speed will increase the risk of accidents on highway. A device is required by the driver to adjust the vehicle speed during the long distance (cruise) driving on highway without neglecting the safety aspects. The device is known as Adaptive Cruise Control (ACC). The ACC is a subsystem of Advanced Driver Assistance Systems (ADASs) that serves to assist the driver during cruise driving. The working principle of the ACC is the vehicle speed set automatically so that the distance to the vehicle in front remains safe. This paper presents the development of fuzzy logic controller for ACC. The fuzzy inference method used in this study is Mamdani. The result from hardware simulation that using remote control car shows that the fuzzy logic controller can work according to the design.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6734
Volume: 4
Issue: 6
Page: 944-951
Publish at: 2014-12-01

An Area-Optimized Chip of Ant Colony Algorithm Design in Hardware Platform Using the Address-Based Method

https://ijece.iaescore.com/index.php/IJECE/article/view/5536
E. Shafigh Fard , K. Monfaredi , M. H. Nadimi
The ant colony algorithm is a nature-inspired algorithm highly used for solving many complex problems and finding optimal solutions; however, the algorithm has a major flaw and that is the vast amount of calculations and if the proper correction algorithm and architectural design are not provided, it will lead to the increasing use of hardware platform due to the high volume of operations; and perhaps at higher scales, it causes the chip area not to work because of the high number of problems; hence, the purpose of this paper is to save the hardware platform as far as possible and use it optimally through providing a particular algorithm running on a reconfigurable chip driven by the address-based method, so that the comparison of synthesis operations with the similar works shows significant improvements as much as 1/3 times greater than the other similar hardware methods.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6923
Volume: 4
Issue: 6
Page: 989-998
Publish at: 2014-12-01

Modelling of Faulty Three Phase Induction Motor by Field Orientation

10.11591/ijeecs.v12.i12.pp8069-8076
M. Jannati , N. R. N. Idris , M. J. A. Aziz
This study investigates the simple vector control of a 3-phase squirrel cage Induction Motor (IM) under open-circuit fault (faulty 3-phase IM). It was shown that it is needed to supply the stator windings with unbalanced currents to remove the oscillating term of the machine electromagnetic torque. The vector control system is based upon Field-Oriented Control (FOC) that has been adapted for this type of machine. Simulation results are provided to show the operation of the proposed drive system.
Volume: 12
Issue: 12
Page: 8069-8076
Publish at: 2014-12-01

A Novel Direct Torque Control for Induction Machine Drive System with Low Torque And Flux Ripples using XSG

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5025
Souha Boukadida , Soufien Gdaim , Abdellatif Mtibaa
The conventional Direct Torque Control (DTC) is known to produce a quick and robust response in AC drives. However, during steady state, stator flux and electromagnetic torque which results in incorrect speed estimations and acoustical noise. A modified Direct Torque Control (DTC) by using Space Vector Modulation (DTC-SVM) for induction machine is proposed in this paper. Using this control strategy, the ripples introduced in torque and flux are reduced. This paper presents a novel approach to design and implementation of a high perfromane torque control (DTC-SVM) of induction machine using Field Programmable gate array (FPGA).The performance of the proposed control scheme is evaluated through digital simulation using Matlab\Simulink and Xilinx System Generator. The simulation results are used to verify the effectiveness of the proposed control strategy.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6374
Volume: 4
Issue: 4
Page: 517-527
Publish at: 2014-12-01

Improving the Dielectric Properties of High Density Polyethylene by Incorporating Clay-Nano Filler

10.11591/ijeecs.v12.i12.pp7987-7995
Osama Elsayed Gouda , Sohair F. Mahmoud , Ahmed A. El-Gendy , Ahmed S. Haiba
Polymer Nano composites have been used for various important industrial applications. The preparation of high density polyethylene composed with Na-montmorillonite Nano filler using melt compounding method for different concentrations of clay-Nano filler of 0%, 2%, 6%, 10%, and 15% has been successfully done. The morphology of the obtained samples was optimized and characterized by scanning electron microscope showing the formation of the polymer Nano composites. The thermal stability and dielectric properties were measured for the prepared samples. Thermal gravimetric analysis results show that thermal stability in polymer Nano composites is more than that in the base polymer. It has been shown that the polymer Nano composites exhibit some very different dielectric characteristics when compared to the base polymer. The dielectric breakdown strength is enhanced by the addition of clay-Nano filler. The dielectric constant and dissipation factor have been studied in the frequency range 200 Hz to 2 MHz at room temperature indicating that enhancements have been occurred in dielectric constant and dissipation factor by the addition of clay-Nano filler in the polymer material when compared with the pure material.
Volume: 12
Issue: 12
Page: 7987-7995
Publish at: 2014-12-01

Speed Sensorless Direct Rotor Field-Oriented Control of Single-Phase Induction Motor Using Extended Kalman Filter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5016
Mohammad Jannati , Seyed Hesam Asgari , Nik Rumzi Nik Idris , Mohd Junaidi Abdul Aziz
Nowadays, Field-Oriented Control (FOC) strategies broadly used as a vector based controller for Single-Phase Induction Motors (SPIMs). This paper is focused on Direct Rotor FOC (DRFOC) of SPIM. In the proposed technique, transformation matrices are applied in order to control the motor by converting the unbalanced SPIM equations to the balanced equations (in this paper the SPIM with two different stator windings is considered). Besides this control technique, a method for speed estimation of SPIM based on Extended Kalman Filter (EKF) to achieve the higher performance of SPIM drive system is presented. Simulation results are provided to demonstrate the high performance of the presented techniques.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6098
Volume: 4
Issue: 4
Page: 430-437
Publish at: 2014-12-01

The Influence of Aspect Ratio and Orientation to Scattering Properties of Ellipsoid Ice Particles

10.11591/ijeecs.v12.i11.pp7543-7548
Jinhu Wang , Junxiang Ge , Ming Wei
The influence of aspect ratio and orientation to scattering properties of ellipsoid ice particles at 94GHz is studied by Discrete-Dipole Approximation (DDA) method. Absorption efficiency, scattering efficiency, asymmetry factor and backscattering efficiency are computed with aspect ratios vary from 0.2 to 1.0, whose size parameter range are selected from 0 to 5. It is found that the values of scattering properties are increasing if the particle size increases, but if the size is larger than the limit value, oscillation occur, and the oscillation phenomenon will be smoothed by random orientation compared with that of horizontal orientation because scattering properties computed by random orientation method have more average frequency than that of horizontal orientation. In non-oscillating region, the scattering efficiency is larger than the absorption efficiency due to small imaginary part of the complex refractive of ice at 94 GHz, and scattering properties increase if the aspect ratio increases with the same size parameter but this feature is apparent only in the case of horizontal orientation. The asymmetric degree of forward scattering and backscattering increases when particle size increases when size parameter of particle is not exceeding 1.5.
Volume: 12
Issue: 11
Page: 7543-7548
Publish at: 2014-11-01

Weighted Samples Based Background Modeling for the Task of Motion Detection in Video Sequences

10.11591/ijeecs.v12.i11.pp7778-7784
Boubekeur Mohamed Bachir , Benlefki Tarek , Luo SenLin , Labidi Hocine
In this paper,a non parametric method for background subtraction and moving object detection based on adaptive threshold using successive squared differences and including frame differencing process is proposed. the presented scheme focused on the case of adaptive threshold and dependent distance calculation using a weighted estimation procedure. In contrast with the existing update procedures (Firstin First-out, random pickup), We proposed an intuitive update policy to the background model based onassociated decreasing weights. The presented algorithm succeeds on extracting the moving foreground with efficiency and overpasses the problematic of ghost situations. The proposed framework provides robustness to noise. Experiments show competitive results compared to existing approaches and demonstrate the applicability of the proposed scheme in a variety of video surveillance scenarios.
Volume: 12
Issue: 11
Page: 7778-7784
Publish at: 2014-11-01
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