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28,451 Article Results

Multiband OFDM for Cognitive Radio – A Way for Cyclostationary Detection and Interference Cancellation

10.11591/ijece.v6i4.pp1702-1709
Avila J , Thenmozhi K
With the tremendous growth in wireless technology there has been a shortage in the spectrum utilized for certain applications while some spectrum remains idle. To overcome this problem and for the efficient utilization of the spectrum cognitive radio is the suitable solution.Multiband OFDM can be easily modeled as cognitive radio, a technology that is employed for utilizing the available spectrum in the most efficient way. Since sensing of the free spectrum for detecting the arrival of the primary users is the foremost job of cognitive, here cyclostationary based spectrum sensing is carried out. Its performance is investigated using universal software defined radio peripheral (USRP) kit which is the hardware test bed for the cognitive radio system. Results are shown using Labview software. Further to mitigate the interference between the primary and cognitive users a modified intrusion elimination (AIC) algorithm had been proposed which in turn ensures the coexistence of both the users in the same wireless environment.
Volume: 6
Issue: 4
Page: 1702-1709
Publish at: 2016-08-01

A Criterion on Existence and Uniqueness of Behavior in Electric Circuit

10.11591/ijece.v6i4.pp1529-1533
Takuya Hirata , Eko Setiawan , Kazuya Yamaguchi , Ichijo Hodaka
Behavior of electric circuits can be observed by solving circuit equations symbolically as well as numerically. In general, symbolic computation for circuits with certain number of circuit elements needs much more time than numerical computation. It is reasonable to check the existence and uniqueness of the solution to circuit equations beforehand in order to avoid computation for the case of no solution. Indeed, some circuits have no solution; in that case, one should notice it and avoid to wait meaningless computation. This paper proposes a new theorem to check whether given circuit equations have a solution and their voltages and currents of all circuit elements are uniquely determined or not. The theorem is suitable for developing a computer algorithm and helps quick symbolic computation for electric circuits.
Volume: 6
Issue: 4
Page: 1529-1533
Publish at: 2016-08-01

Improving the power factor correction in the presence of harmonics by reducing the effect of resonance and harmonics

10.11591/ijeecs.v3.i2.pp282-295
Saber M. Saleh , Mohamed E. Arafa
Harmonics in electrical networks occur as a result of non-linear loads.  It has an effect on power factor improvement using capacitors in terms of increasing the unbalance current between units. In addition, the occurrence of resonance and result in the exit of capacitors from service by the protective relays to protect the units from collapse. The main objective of this research is the real-time study of improving the power factor with reducing the effect of the resonance and harmonics on the power system. This reduction can be done using filters, consist of reactors and capacitors connected in series or in parallel or series and parallel together to reduce the current harmonics or voltage harmonics. Single Tuned filter type (passive filter) is used which presents very low impedance at the tuning frequency, through which all current of that particular frequency will be diverted. This research presents two practical power systems 11kV source in Fayoum substation and 13.8kV source in New Badr substation connected to power factor Improvement circuit. These models simulated by Matlab at different unbalance currents and harmonics. Also, it presents the design of the series reactor and the harmonics filter which satisfy the minimum effect of resonance and harmonics.
Volume: 3
Issue: 2
Page: 282-295
Publish at: 2016-08-01

Tele-immersion

10.11591/ijict.v5i2.pp73-78
Jayanthila Devi
Tele-immersion is an advanced form of virtual reality that will allow users in different places to interact in real time in a shared simulated environment. Tele-immersion is a technology to be implemented with Internet that will enable users in different geographic locations to come together in a simulated environment to interact. Users will feel like they are actually looking, talking, and meeting with each other face-to-face in the same room.This technology causes users to feel as if they were in the same room. The tele-immersion technology uses a "tele-cubicle" which is equipped with large screens, scanners, sensors, and cameras. The tele-cubicles are linked together in real-time so that they form one larger cubicle. Through the virtual environment, participants are able to interact with other group members. Also, virtual objects and data can be passed through the walls between participants, and placed on the shared table in the middle for viewing.
Volume: 5
Issue: 2
Page: 73-78
Publish at: 2016-08-01

Implementation of Object Recognition Based on Type of Vehicle Entering Main Gate

10.11591/ijeecs.v3.i2.pp458-467
Hairol Nizam Mohd Shah , Mohd Zamzuri Ab Rashid , Zalina Kamis , Muhammad Nizam Kamarudin , Mohd Fairus Abdollah , Alias Khamis
This project related to develop and implementation of object recognition based on type of vehicle entering the main gate to facilitate the employment data of vehicles entering according to the types of vehicles. Data for the number of vehicles in accordance with the types recorded. In completing this project, there are two algorithms used, the detection algorithm and classification algorithm. Vehicles will be classified by comparison in terms of it front light area and will be stored in three types of vehicles; sedan, multipurpose van or van, and four wheel drive. Wireless camera is mounted with 1.6 meters high on the pipe rod at the guard house as input for the processing algorithm. Vehicle image will be captured by a wireless camera and then processed to identify its type. Data for the type of vehicle and number of vehicles by type is shown through the Graphical User Interface (GUI). Inflow and outflow of vehicles can be monitored via the control unit (GUI) without human monitoring at the entrance.
Volume: 3
Issue: 2
Page: 458-467
Publish at: 2016-08-01

A Innovation Identification Approach of Control System by Irrational (Fractional) Transfer

10.11591/ijeecs.v3.i2.pp336-342
Nguyen Quang Dung , Tran Hoang Quang Minh
In this paper, an innovative algorithm of identification of control system, described by irrational transfer function with distributed parameter characteristics - with irrational components, is proposed. Algorithm is based on real interpolation method (RIM). Parameters of irrational transfer function can be identified by its experimental transient responses. Each of them can be represented by an analytic expression, table or graph. The proposed method is computationally efficient, simple and practical, as is illustrated by numerical examples. In the furure, the method can be used for tuning the controller and for direct application construction of adaptive controllers, working on the identification principle.
Volume: 3
Issue: 2
Page: 336-342
Publish at: 2016-08-01

Dual-Band Proximity Coupled Feed Microstrip Patch Antenna with ‘T’ Slot on the Radiating Patch and ‘Dumbbell’ Shaped Defected Ground Structure

10.11591/ijeecs.v3.i2.pp435-440
Dawit Fitsum , Dilip Mali , Mohammed Ismail
This paper presents Dual-Band proximity coupled feed rectangular Microstrip patch antenna with slots on the radiating patch and Defected Ground Structure. Initially a simple proximity coupled feed rectangular Microstrip patch antenna resonating at 2.4 GHz is designed. Etching out a ‘Dumbbell’ shaped defect from the ground plane and ‘T’ shaped slot from the radiating patch of the proximity coupled feed rectangular Microstrip patch antenna, results in a Dual-Band operation, i.e., resonating at 2.4 GHz and 4.5 GHz; with 30.3 % and 18.8% reduction in the overall area of the patch and the ground plane of the reference antenna respectively. The proposed antenna resonates in S-band at frequency of 2.4 GHz with bandwidth of 123.6 MHz and C-band at frequency of 4.5 GHz with bandwidth of 200 MHz, and a very good return loss of -22.1818 dB and -19.0839 dB at resonant frequency of 2.4 GHz and 4.5 GHz respectively is obtained. The proposed antenna is useful for different wireless applications in the S-band and C-band.
Volume: 3
Issue: 2
Page: 435-440
Publish at: 2016-08-01

Motorcycle-Security using Position Searching Algorithm Based on Hybrid Fuzzy-Dijkstra

10.11591/ijeecs.v3.i2.pp468-474
Rofiq Mubarok , Dwi Verdy Firmansyah , Dheny Haryanto , Noor Pratama Apriyanto , Umniyatul Mahmudah , Iswanto Iswanto
Motorcycle safety system has been provided by the manufacturer in the form of a handlebar lock and electrical key equipped with alarms. Keys provided by the manufacturers sometimes fail in securing a motorcycle. In addition the safety system does not provide position information of the stolen motorcycle to the owner. With these problems, the paper presents safety locked motorcycle equipped with artificial intelligence algorithms. Artificial intelligence algorithm is used to find and detect the location of the motorcycle using the shortest path algorithm. This paper applies search algorithm using Dijkstra algorithm where the algorithm is used to make the decision to get the location of the motorcycle. By using the algorithm, the location of the motorcycle can be detected but it is not able to find the shortest path needed. Therefore, this paper describes the modification of Dijkstra algorithm by adding a Fuzzy algorithm that is used for the weight values in decision making, so that it can pursue to find the shortest path.
Volume: 3
Issue: 2
Page: 468-474
Publish at: 2016-08-01

Harmonic Elimination of Seven Level Inverter with Switching Pattern Reconfiguration Technique Using Hybrid BBO/MAS Algorithm

10.11591/ijape.v5.i2.pp79-86
R. Kavitha , Rani Thottungal , Brindha. R
A hybrid optimization algorithm is proposed in this paper to find the optimum switching angles in a Cascaded Multilevel Inverter (CMLI). A seven level cascaded inverter is considered and optimum switching angles are found by hybrid Biogeographical Based Optimization search (BBO) / Mesh Adaptive Direct Search (MAS) algorithm. The fundamental frequency Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM)  technique is applied in order to reduce the switching losses.Reconfiguration technique is also proposed to achieve harmonic elimination for entire  Modulation index(M). The various performance indices like phase THD, line THD, lower order harmonics eliminated in a CMLI are calculated based on the optimized switching angles. A seven level CMLI is simulated in MATLAB/SIMULINK by using switching angles calculated from BBO/MAS algorithm and the FFT analysis of traditional SHE-PWM and reconfiguration SHE-PWM methods are compared and verified with the calculated values from BBO/MAS algorithm.
Volume: 5
Issue: 2
Page: 79-86
Publish at: 2016-08-01

Digital Certificates Resource Sharing Service Capability Evaluation

10.11591/ijeecs.v3.i2.pp453-457
Pengxiang Tang , Yao Zhong , Yingcheng Xu , Yue You , Li Wang
The certification resource is a very special class of information resources of the government, which has huge amount of information and frequency usages of government administrative activities. With the various administrative departments’ in-depth online approval, there is an urgent demand for certificates information sharing needs, especially in interdepartmental tasks. In this paper, government service capacity evaluation of digital certificates resource sharing is the study object. First we checked literature and questionnaires to establish an evaluation indexes system of digital license resource sharing service capacity. Then we built fuzzy AHP evaluation model to evaluate the ability of the service. Finally we took Beijing Municipal Government Office as the empirical analysis of objects, and got the evaluation result of their digital certificates resource sharing service capacity.
Volume: 3
Issue: 2
Page: 453-457
Publish at: 2016-08-01

Z- Source Inverter Based Dynamic Voltage Restorer for the Mitigation of Voltage Sag/Swell

10.11591/ijape.v5.i2.pp87-94
K. Prameela , D. Vijay Kumar , B. Trinadha
This paper uses super capacitor as the energy storage device for the DVR to compensate voltage sag, voltage swell and harmonics due to addition of nonlinear load in the distribution line. Based on this topology, DVR consist of super capacitor, z source inverter and injection transformer. Super capacitor produces the necessary dc voltage which is given as the input voltage to the z-source inverter; provide the necessary injecting voltage, which has to be restored. A new topology based on Z-source inverter is presented in order to enhance the voltage restoration property of dynamic voltage restorer. Z-source inverter would ensure a constant DC voltage across the DC-link during the process of voltage compensation. The modeling of Z-source based dynamic voltage restorer is carried out component wise and their performances are analyzed using MATLAB software
Volume: 5
Issue: 2
Page: 87-94
Publish at: 2016-08-01

Design and Implementation of Three Phase Reversing Voltage Multilevel Inverter

10.11591/ijape.v5.i2.pp59-71
G. Vijaykrishna , Y. Kusumalatha
This paper examines how a Reversing voltage multilevel inverter (RVMLI) strategy is enforced to develop multilevel inverter fulfilment. This approach has been used SPWM-PD technique to regulate the electrical inverter. It desires numerous less range of carrier signals to deliver gate pulses of switches. Increasing within the levels during this strategy aid in reduction of output voltage harmonics expeditiously and improves power quality at output of the electrical inverter. It wants a lowered quantity of total switches, which is in a position to decreases of switching losses in this process. The Three-phase reversing voltage multilevel inverter of 7- level and 9- level is accomplished for R-load and R-L load and Three Phase Induction Motor. A reversing voltage multilevel inverter of 7- level and 9- level simulation is intended and developed. Mat lab/Simulink outcome is awarded to validate the proposed scheme.
Volume: 5
Issue: 2
Page: 59-71
Publish at: 2016-08-01

An Optimizing Approach for Multi Constraints Reassignment Problem of Human Resources

10.11591/ijece.v6i4.pp1907-1919
Tkatek Said , Abdoun Otman , Abouchabaka Jaafar , Rafalia Najat
This paper presents an effective approach to optimize the reassignment of Human Resources in the enterprise that is formed by several units of productions to take into consideration the human characteristics. This approach consists of two steps; the first step is to formalize the studied problem that is practically take the form of the generalized assignment problem (GAP) known as NP-hard problem. Additionally, the variables in the formulation of our problem are interlinked by certain constraints. These two proprieties can to justify the important complexity of this problem. The second step is focused to solve this complex problem by using the genetic algorithm. We present the experimentally result for justifying the validity of the proposed approach. So, the solution obtained allowed us to get an optimal assignment of personnel that can lead to improve the average productivity or ratability or at least ensure its equilibration within sites of enterprise.
Volume: 6
Issue: 4
Page: 1907-1919
Publish at: 2016-08-01

Analysis of Selected Earth-Space Rain Attenuation Models for a Tropical Station

10.11591/ijeecs.v3.i2.pp383-391
A. I. O. Yussuff
The restrained use of millimeter bands is due to severe rain attenuation. Attenuation is caused when rain cells intersects radio wave’s propagation path; resulting in deep fades. The effect of rainfall is more severe in tropical regions characterized by heavy rainfall intensity and large raindrops; hence, rain attenuation analyses are essential to study rain fade characteristics for use in earth-space link budget analysis, for outage prediction resulting from rain attenuation. Tropical regions are particularly challenged with signal outage, necessitating the formulation and development of suitable prediction model(s) for the region. Therefore, extensive knowledge of the propagation phenomena mitigating system availability and signal quality in these bands are required. Daily rainfall data were collected from the Nigerian Meteorological Services for Lagos for spanning January to December 2010. Results showed that although, the ITU-R model out-performed the other prediction models under consideration, none of prediction models matched the measurement data.
Volume: 3
Issue: 2
Page: 383-391
Publish at: 2016-08-01

Single Phase PV Inverter Applying a Dual Boost Technology

10.11591/ijape.v5.i2.pp95-102
Sudha Bhutada , S.R. Nigam
In this paper, a single-phase PV inverter applying a dual boost converter circuit inverter is proposed for photovoltaic (PV) generation system and PV grid connected system. This system is designed to improve integration of a Single phase inverter with Photovoltaic panel. The DC 24V is converted into to 86V DC and then 86V DC to 312V DC. The 312 V DC is then successfully inverted to AC 220V. Hence solar energy is powerfully converted into electrical energy for fulfilling the necessities of the home load, or to link with the grid. Matlab Simulation software was used for simulation of the circuit and outcome is presented in this paper.
Volume: 5
Issue: 2
Page: 95-102
Publish at: 2016-08-01
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