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23,598 Article Results

Experimental Investigations on the Influence of Flux Control Loop in a Direct Torque Control Drive.

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4925
Bhoopendra Singh , Shailendra Jain , Sanjeet Dwivedi
Accurate flux estimation and control of stator flux by the flux control loop is the determining factor in effective implementation of DTC algorithm. In this paper a comparison of voltage model based flux estimation techniques for flux response improvement is carried out. The effectiveness of these methods is judged on the basis of Root Mean Square Flux Error (RMSFE) and Total Harmonic Distortion (THD) of stator current. The theoretical aspects of these methods are discussed and a comparative analysis is provided with emphasis on digital signal processor (DSP) based controller implementation. Further the effect of operating flux on the performance of induction motor drive in terms of dynamic response, torque ripple and efficiency of operation is carried out. The proposed investigation is experimentally validated on a test drive.DOI: http://dx.doi.org/10.11591/ijpeds.v2i4.554
Volume: 2
Issue: 4
Page: 454-462
Publish at: 2012-12-01

Verification of Vehicular Emitted Aerosol Components in Soil Biochemical Characteristics in Owerri West Local Government Area, Imo State, Nigeria

10.11591/ijaas.v1.i4.pp147-152
Ubuoh Emmanuel Attah
The study was carried out in Avu Junction in Owerri West L.G.A. at graded distant from the tarred road with an average vehicular flow between 10,000 to 12,000 per day. Soil samples were taken at the distant of 50m, 100m, 150m  and 200m respectively. And auger soil samples were  taken at the depths of  0-30 cm and  30-45 cm accordingly. Soil factor, heavy metals and microbial populations were investigated at graded distances. From the result of soil factors,  pH values indicated acidity  with decreased distant from the tarred road ranging between  4.52 – 6.32,  soil temperature on the topsoil was higher than subsoil ranging between  19- 25 0C and 18 – 22 0C and soil moisture increases with increased distant from the tarred road ranging  between 10.00 – 13.3. Heavy metal concentrations in the soil increased with decreased distant in the order of Pb < Zn < Ni < Cu < Cd. Overall results revealed  that  Cd  in the soil constitutes the highest percentage of 91.7%,  Ni  90.9%, Cu 90.1%, Pb. 84.7% and  Zn. 81.7%. Significantly, higher fungi and bacterial populations were recorded at increased distant from the tarred road. This then called for proactive measures to  checkmate soil contamination due to pollutants from vehicular flows.
Volume: 1
Issue: 4
Page: 147-152
Publish at: 2012-12-01

Finite Element Analysis for Five Transmission Lines in Multilayer Dielectric Media

10.11591/ijaas.v1.i4.pp181-190
Sarhan Musa , Matthew N. O. Sadiku
Development of very high speed integrated circuits is currently of great interests for today technologies. This paper presents the quasi-TEM approach for the accurate parameters extraction of multiconductor transmission lines interconnect in single, two, and three-layered dielectric region using the finite element method (FEM).  We illustrate that FEM is as accurate and effective for modeling multilayered multiconductor transmission lines in strongly inhomogeneous media. We mainly focus on designing of five-conductor transmission lines embedded in single-, two-, three-, and four-layered dielectric media. We compute the capacitance matrices for these configurations. Also, we determine the quasi-TEM spectral for the potential distribution of the multiconductor transmission lines in multilayer dielectric media.
Volume: 1
Issue: 4
Page: 181-190
Publish at: 2012-12-01

Z Source Inverter for Photovoltaic System with Fuzzy Logic Controller

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4916
Vijayabalan R , S. Ravivarman
In this paper, the photovoltaic system is used to extract the maximum power from sun to get the dc voltage. The output dc voltage is boost up into maximum voltage level by using the SEPIC converter. This converter voltage is fed to Z source inverter to get the AC voltage. The Z source inverter system can boost the given input voltage by controlling the boost factor, to obtain the maximum voltage. PWM technique which is used as to given the gating pulse to the inverter switches. Modified system is very promising for residential solar energy system. In stand-alone systems the solar energy yield is matched to the energy demand. Wherever it was not possible to install an electricity supply from the mains utility grid, or desirable, stand-alone photovoltaic systems could be installed. This proposed system is cost-effective for photovoltaic stand-alone applications. This paper describes the design of a rule based Fuzzy Logic Controller (FLC) for Z Source inverter. The obtained AC Voltage contains harmonics of both odd and even harmonics of lower and higher order. Higher order harmonics are eliminated with the help of Filters. Here the impedance network act as a filter to reduce the lower order harmonics obtained in the system. So with the help of FFT analysis this value is obtained to be 15.82%.DOI: http://dx.doi.org/10.11591/ijpeds.v2i4.335
Volume: 2
Issue: 4
Page: 371-379
Publish at: 2012-12-01

Fuzzy and Interval Finite Element Method for Heat Conduction Problem

10.11591/ijaas.v1.i4.pp171-180
Sarangam Majumdar , Sukanta Nayak , S Chakraverty
Traditional finite element method is a well-established method to solve various problems of science and engineering. Different authors have used various methods to solve governing differential equation of heat conduction problem.  In this study, heat conduction in a circular rod has been considered which is made up of two different materials viz. aluminum and copper. In earlier studies parameters in the differential equation have been taken as fixed (crisp) numbers which actually may not. Those parameters are found in general by some measurements or experiments. So the material properties are actually uncertain and may be considered to vary in an interval or as fuzzy and in that case complex interval arithmetic or fuzzy arithmetic has to be considered in the analysis. As such the problem is discretized into finite number of elements which depend on interval/fuzzy parameters. Representation of interval/fuzzy numbers may give the clear picture of uncertainty. Hence interval/fuzzy arithmetic is applied in the finite element method to solve a steady state heat conduction problem. Application of fuzzy finite element method in the said problem gives fuzzy system of linear equations in general. Here new methods have also been proposed to handle such type of fuzzy system of linear equations. Corresponding results are computed and has been reported here.
Volume: 1
Issue: 4
Page: 171-180
Publish at: 2012-12-01

A Coupling Method of Homotopy Technique and Laplace Transform for Nonlinear Fractional Differential Equations

10.11591/ijaas.v1.i4.pp159-170
Esmail Hesameddini , Mohsen Riahi , Habibolla Latifizadeh
In this work, the solutions of the fractional Sharma-Tasso-Olver (FSTO) and Fisher differential equations were investigated. The present study proposed a new novel and simple analytical method to obtain the solutions of FSTO and Fisher differential equations. Whereas, for nonlinear equations in general, no method is exists which yields to exact solution and therefore only approximate analytical solutions can be derived by using procedures such as linearization or perturbation. This method is combined form of the Laplace transformation and the Homotopy perturbation method. Advantage of the Laplace Homotopy Method (LHM), are simplicity of the computations, and non-requirement of linearization or smallness assumptions. For more illustration of the efficiency and reliability of LHM, some numerical results are depicted in different schemes and tables. Numerical results showed that the LHM was partly economical, efficient and precise to obtain the solution of nonlinear fractional differential equations.
Volume: 1
Issue: 4
Page: 159-170
Publish at: 2012-12-01

Design and Simulation of Phase-Locked Loop Controller Based Unified Power Quality Conditioner Using Nonlinear Loads

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4921
C. Prakash , N. Suparna
This project presents a power quality improvement of unified power quality conditioner (UPQC) to compensate current and voltage quality problems of sensitive loads. The UPQC consists of the series and shunt converter having a common dc link. The series converter mitigates voltage sag from the supply side and shunt converter eliminates current harmonics from the nonlimear load side. The developed controllers for series and shunt converters are based on a reference signal generation method (phase-locked loop). The dc link control strategy is based on the fuzzy-logic controllers. The conventional method using dq transformation to show the superiority of the proposed sag detection method. A fast sag detection method is also is presented. The efficiency of the proposed system is tested through simulation studies using the MATLAB/SIMULINK environment.DOI: http://dx.doi.org/10.11591/ijpeds.v2i4.376
Volume: 2
Issue: 4
Page: 417-423
Publish at: 2012-12-01

ICTs in Learning in Pakistan

https://ijere.iaescore.com/index.php/IJERE/article/view/4428
Taimur Ul Hassan , Abdul Rahim Sajid
The paper investigates the barriers to the integration of Information and Communication Technologies (ICTs) at the secondary level learning in Pakistan, with focus on Punjab province. Exploring major barriers to the integration of ICTs at the school level, teacher level and student level and possible enablers to these barriers is the major focus of study. Sequential mixed method design is used. Interviews were analysed qualitatively whereas survey questionnaire were analysed quantitatively. It is observed from the findings that most of the participants are having positive perceptions about the integration of ICT into their teaching and learning. Administrators and ICT coordinators revealed many barriers and possible enablers to the integration of ICTs. Many of these barriers are verified by the teachers and students later on however there were some barriers which were not endorsed by the teachers and students.DOI: http://dx.doi.org/10.11591/ijere.v1i2.1244
Volume: 1
Issue: 2
Page: 51-60
Publish at: 2012-12-01

A Novel Randomized Search Technique for Multiple Mobile Robot Paths Planning In Repetitive Dynamic Environment

https://ijra.iaescore.com/index.php/IJRA/article/view/906
Vahid Behravesh , Seyyed Mohammad Reza Farshchi
Presented article is studying the issue of path navigating for numerous robots. Our presented approach is based on both priority and the robust method for path finding in repetitive dynamic. Presented model can be generally implementable and useable: We do not assume any restriction regarding the quantity of levels of freedom for robots, and robots of diverse kinds can be applied at the same time. We proposed a random method and hill-climbing technique in the area based on precedence plans, which is used to determine a solution to a given trajectory planning problem and to make less the extent of total track. Our method plans trajectories for particular robots in the setting-time scope. Therefore, in order to specifying the interval of constant objects similar to other robots and the extent of the tracks which is traversed. For measuring the hazard for robots to conflict with each other it applied a method based on probability of the movements of robots. This algorithm applied to real robots with successful results. The proposed method performed and judged on both real robots and in simulation. We performed sequence of100tests with 8 robots for comparing with coordination method and current performances are effective. However, maximizing the performance is still possible. These performances estimations performed on Windows operating system and 3GHz Intel Pentium IV with and compiles with GCC 3.4. We used our PCGA robot for all experiments.  For a large environment of 19×15m2where we accomplished 40tests, our model is competent to plan high-quality paths in a severely short time (less than a second). Moreover, this article utilized lookup tables to keep expenses the formerly navigated robots made, increasing the number of robots don’t expand computation time.DOI: http://dx.doi.org/10.11591/ijra.v1i4.1260
Volume: 1
Issue: 4
Page: 214-222
Publish at: 2012-12-01

Primary Prevention Knowledge of Parents and Teachers of Nursery and Play Group on Childhood Sexual Abuse

https://ijere.iaescore.com/index.php/IJERE/article/view/4431
Nnenna Clara Okoroafor
This research explored child sexual abuse (CSA), knowledge and prevention media among parents of pupils and teachers of nursery schools and playgroup. This research was conducted in qualitative mythology, through in-depth interviews (IDIs), and focus group discussions (FGD). In-depth interview held for 10 nursery school teachers and playgroup teachers. For children aged 0-5 years, FGD was conducted towards 10 parents of nursery School and 12 parents of playgroup. The study explored the following: parents’ and teachers’ knowledge on child sexual abuse prevention. The child sexual abuse prevention messages were provided to the children and topics they discussed and their attitudes towards child sexual abuse prevention education in school. The proposed primary prevention media strategies for parents were speech and posters as well as for nursery and playgroup teachers who understood the CSA impact. Research concluded that parents didn’t understand CSA concepts; media proposed for primary prevention are through dialogue and poster. Nursery, playgroup teachers and parents understood with poster media. Parents and teachers were encouraged to focus on the early prevention by building child sexual abuse knowledgeable community. DOI: http://dx.doi.org/10.11591/ijere.v1i2.1664
Volume: 1
Issue: 2
Page: 73-78
Publish at: 2012-12-01

Dynamics and Optimal Feet Force Distributions of a Realistic Four-legged Robot

https://ijra.iaescore.com/index.php/IJRA/article/view/907
Saurav Agarwal , Abhijit Mahapatra , Shibendu Shekhar Roy
This paper presents a detailed dynamic modeling of realistic four-legged robot. The direct and inverse kinematic analysis for each leg has been considered in order to develop an overall kinematic model of the robot, when it follows a straight path. This study also aims to estimate optimal feet force distributions of the said robot, which is necessary for its real-time control. Three different approaches namely, minimization of norm of feet forces (approach 1), minimization of norm of joint torques (approach 2) and minimization of norm of joint power (approach 3) have been developed. Simulation result shows that approach 3 is more energy efficient foot force formulation than other two approaches. Lagrange-Euler formulation has been utilized to determine the joint torques. The developed dynamic models have been examined through computer simulation of continuous gait of the four-legged robot.DOI: http://dx.doi.org/10.11591/ijra.v1i4.762
Volume: 1
Issue: 4
Page: 223-234
Publish at: 2012-12-01

A Interactive Game to Enhance Student Understanding of Materials Management

https://ijere.iaescore.com/index.php/IJERE/article/view/4427
William E. Mueller , Gholam H. Massiha
It is difficult for students to grasp essential concepts of materials management because there is a considerable amount of new terminology as well as the need to develop a “feel” for what appears to be a static, but in actuality, a very dynamic process. In an attempt to overcome the language barrier as well as help the student develop a “feel” for the process, an old case study from the 70s has been revised and updated it for today’s student.  The method of presentation has also been changed from an out-of class activity to an in-class group activity. Initial results, based on 3 classes of 35-40 students each, have been positive with absenteeism reduced from a historical average of 10-15% down to 2%.  Student attitude appears to be better and test results appear to be better although comparisons in this area are more difficult to measure. A copy of the game is provided and maybe be freely used in your classroom.   Any suggestions for improvement would be greatly appreciated.DOI: http://dx.doi.org/10.11591/ijere.v1i2.1485
Volume: 1
Issue: 2
Page: 45-50
Publish at: 2012-12-01

Design Gradient Descent Optimal Sliding Mode Control of Continuum Robots

https://ijra.iaescore.com/index.php/IJRA/article/view/903
Farzin Piltan , Shahnaz Tayebi Haghighi
In this research, a new approach for gradient descent optimal sliding mode controller for continuum robots is proposed. Based on the new dynamic models developed, a novel technique for nonlinear control of continuum manipulators to be employed in various situations has also been proposed and developed. A section of a continuum arm is modeled using lumped model elements (masses, springs and dampers) and control by nonlinear methodology (sliding mode method) and optimization the sliding surface slope by gradient descent method. It is shown that this type of control methodology, although used to a certain model, can be used to conveniently control the dynamics of the arm with suitable tradeoff in accuracy of modeling. This relatively controller is more plausible to implement in an actual real-time when compared to other techniques of nonlinear controller methodology of continuum arms. Principles of sliding mode methodology is based on derive the sliding surface slope and nonlinear dynamic model and applied in the system. Based on the gradient descent optimization method, the sliding surface slope and gain updating factor has been developed in certain and partly uncertain continuum robots. This methodology is represented in certain and uncertain area whose only optimization for certain area and test this optimization for uncertainty. The new techniques proposed and methodologies adopted in this paper supported by MATLAB/SIMULINK results represent a significant contribution to the field of design an optimized nonlinear sliding mode controller for continuum robots.DOI: http://dx.doi.org/10.11591/ijra.v1i4.883
Volume: 1
Issue: 4
Page: 175-189
Publish at: 2012-12-01

Integrating Neuro-Fuzzy Systems to Develop Intelligent Planning Systems for Predicting Students’ Performance

https://ijere.iaescore.com/index.php/IJERE/article/view/4429
Urvashi Rahul Saxena
This paper presents a simulation of Neuro-Fuzzy application for analyzing students’ performance based on their CPA and GPA. This analysis is an attempt for extension of Analysis on Student’s Performance Using Fuzzy Systems. This paper focuses to support the development of Intelligent Planning System (INPLANS) using Fuzzy Systems, Neural Networks, and Genetic Algorithms which will be used by the Academic Advisory Domain in educational institutions by evaluating and predicting students’ performance as well as comparing the results with the previous study. The Neuro-Fuzzy model is feed-forward architecture with five layers of neurons and four connections. System evaluation has been done for about 20- 26 cases of students’ results. The results depict that there has been a significant improvement in the performance of students’ as compared to the prediction of the same case using Fuzzy Systems.DOI: http://dx.doi.org/10.11591/ijere.v1i2.738
Volume: 1
Issue: 2
Page: 61-66
Publish at: 2012-12-01

Intelligent Vision System for Door Sensing Mobile Robot

https://ijra.iaescore.com/index.php/IJRA/article/view/904
Jharna Majumdar , R Praveen Kumar Jain , Venkatesh G M , Swaroop R
Wheeled Mobile Robots find numerous applications in the Indoor man made structured environments. In order to operate effectively, the robots must be capable of sensing its surroundings. Computer Vision is one of the prime research areas directed towards achieving these sensing capabilities. In this paper, we present a Door Sensing Mobile Robot capable of navigating in the indoor environment. A robust and inexpensive approach for recognition and classification of the door, based on monocular vision system helps the mobile robot in decision making. To prove the efficacy of the algorithm we have designed and developed a ‘Differentially’ Driven Mobile Robot. A wall following behavior using Ultra Sonic range sensors is employed by the mobile robot for navigation in the corridors.  Field Programmable Gate Arrays (FPGA) have been used for the implementation of PD Controller for wall following and PID Controller to control the speed of the Geared DC Motor.DOI: http://dx.doi.org/10.11591/ijra.v1i4.1262
Volume: 1
Issue: 4
Page: 190-202
Publish at: 2012-12-01
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