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29,734 Article Results

A simple switching on-time calculation revision in multilevel inverter-space vector modulation to achieving extended voltage boundary operation

10.11591/ijpeds.v10.i2.pp653-661
Bharatiraja C. , R.K. Pongiannan , Adedayo Yusuff , Mohd Tariq , Telugu Maddileti , Tharwinkumar Tharwinkumar
In inverters’ pulse width modulation techniques (PWM) the Space Vector PWM (SVPWM) is a smart contestant due to its direct control in nature with variables which provide the straight forward finds to each inverter switching vector. The industrial drives are acquainting to use SVPWM owing extended speed –torque region operations. However, the extended SVPWM operation is uses much mathematical calculation to predict the switching on-times, which demands high digital platform.  In order to reduce this calculation in this paper a simple on-time calculation based SVPWM is proposed. The proposed SVPWM is developed for three-level multilevel inverter and the space perspective of vector analysis are established and explained. The over modulation enhances the proper power utilization capacity of voltage source inverter thereby improve the inverter output voltage and load. This proposed method tailed the similar mathematical practice as conventional two-level SVPWM for calculating sector identification and triangle determination. The approach finds the circular and hexagonal boundary on-time based on the straightforward reference vector position identification and calculates directly the switching pulse patterns for the inverter devices using an expression based on the definition of the duty cycle. The performance of the proposed SVM is simulated by MATLAB 11.b simulation software and validated with laboratory setup 2 kW, 12 switch neutral point clamped (NPC)-MLI fed 1.5 HP squirrel cage 3-phase induction motor open loop v/f control drive. The simulation and experimental results are closure and confirming the advantages of the proposed SVM method. The proposed scheme can be extended to n-level inverter and also applicable to cascaded H-bridge topology.
Volume: 10
Issue: 2
Page: 653-661
Publish at: 2019-06-01

Fault modeling and parametric fault detection in analog VLSI circuits using discretization

10.11591/ijece.v9i3.pp1598-1605
Baldev Raj , G. M. Bhat , Sandeep Thakur
In this article we describe new model for determination of fault in circuit and also we provide detailed analysis of tolerance of circuit, which is considered one of the important parameter while designing the circuit. We have done mathematical analysis to provide strong base for our model and also done simulation for the same. This article describes detailed analysis of parametric fault in analog VLSI circuit. The model is tested for different frequencies for compactness and its flexibility. The tolerance analysis is also done for this purpose. All the simulation are done in MATLAB software.
Volume: 9
Issue: 3
Page: 1598-1605
Publish at: 2019-06-01

A review on different control techniques using DSTATCOM for distribution system studies

10.11591/ijpeds.v10.i2.pp813-821
K. Swetha , V. Sivachidambaranathan
This paper focus on distribution system by applying different control techniques in order to improve the performance of the system. In the distribution system mainly concentrate on power quality issues like reactive power control, harmonic elimination, power factor correction, etc. Because of power quality problems voltage, current, frequency are continuously changing in power systems. These changes will effects the performance of power systems. Power quality problems can be compensated by placing DSTATCOM which is connected at PCC in parallel. It is shunt connected VSI along with the filters, with the help of DSTATCOM voltage sag, swell and THD can be controlled. This paper presents detailed explanation about performance and configuration of latest control techniques to control the DSTATCOM.
Volume: 10
Issue: 2
Page: 813-821
Publish at: 2019-06-01

Solar energy storage and release application of water-phase change material- (SnO2-TaC) and (SnO2–SiC) nanoparticles system

10.11591/ijaas.v8.i2.pp154-156
Farhan Lafta Rashid , Aseel Hadi , Ammar Ali Abid , Ahmed Hashim
The thermal energy  storage and release application of water- phase change material- (SnO2-TaC) and (SnO2–SiC) nanoparticles system has been investigated for cooling and heating applications. The water - polyethylene glycolwith (SnO2-TaC) and (SnO2–SiC) nanoparticles have been used. The results showed that the melting and solidification times for storage and release of thermal energy of water - polyethylene glycoldecrease with increase in(SnO2-TaC) and (SnO2–SiC) nanoparticles concentrations. The melting and solidification times decrease with increasing of TaC nanoparticles concentrations to water-polyethylene glycol/SnO2nanofluidand SiC nanoparticles concentrations to water-polyethylene glycol/SnO2nanofluid.
Volume: 8
Issue: 2
Page: 154-156
Publish at: 2019-06-01

Efficiency and effectiveness video on demand over worldwide interoperability for microwave access

10.11591/ijece.v9i3.pp1919-1923
Muthanna Jaafar Abbas , Abeer Abd Al Hameed Mahmood
(WiMAX) is another solution for readiness broadband networks inside the region, covered or not, by alternative technologies like (ADSL) or cable through this paper by deploying many mobility patterns such as static, random and path for Video on Demand (VoD) over (WiMAX) Network. The performance of varied (QPSK) and (QAM) modulation techniques, by applying the (OPNET) simulator version 17.5. This work is finished in terms of the transmitted traffic and received traffic. Simulation result indicates that once nodes are moving by (SVC) code schema in (WiMAX). The result is an effective and attainable overall performance of (QPSK) which is better than (QAM) modulation technique.
Volume: 9
Issue: 3
Page: 1919-1923
Publish at: 2019-06-01

Rain attenuation statistics over 5G millimetre wave links in Malaysia

10.11591/ijeecs.v14.i2.pp1012-1017
Mustafa Ghanim , Manhal Alhilali , Jafri Din , Hong Yin Lam
Millimetre wave band is a solid contender to be utilized for the future 5G wireless systems deployment. Rain-induced attenuation is a major disadvantage at these frequencies. This paper presents statistics of rain-induced attenuation and rainfall data for two years of horizontally polarized links propagating at 38 GHz and 26 GHz over a terrestrial path link of 301 meters. From the analysed datasets, a rain rate around 116 mm/h exceeded at 0.01% of the time of an average year, while the links recorded 16 and 9.5 dB at the same percentage of time for 38 and 26 GHz respectively. The study aims to identify the prediction model that deliver most reasonable predictions for 5G links operating in Malaysian tropical climate. ITU-R P.530-17, Mello’s, and Ghiani’s models were all examined. Using ITU-R model, relative error margins of around 3.8%, 30% and 49.7% alongside 22.3, 9.5, 33% were obtained in 0.1%, 0.01% and 0.001% of the time for 26 and 38 GHz respectively.  Curiously, ITU-R model demonstrates better predictions to measured rain attenuation with lower error probability. This study highlights the need for new prediction models for short path-length 5G links and helps to improve the design of terrestrial links operating at millimetre wave frequencies in tropical regions.
Volume: 14
Issue: 2
Page: 1012-1017
Publish at: 2019-05-01

Mango ripeness classification system using hybrid technique

10.11591/ijeecs.v14.i2.pp859-868
Muhamad Farid Mavi , Zulkifli Husin , Badlishah Ahmad , Yasmin Mohd Yacob , Rohani S. Mohamed Farook , Wei Keong Tan
Nowadays there are many systems develop for agricultural purposes and most system implemented on the use of non-destructive technique not only to classify but also to determine the fruit ripeness. However, most of the studies concentrates using single technique to assess the fruit ripeness. This paper presents the work on mango ripeness classification using hybrid technique. Hybrid stands for mix or combination between two different elements, thus this study combined two different technique that is image processing and odour sensing technique in a single system. Image processing technique are implemented using color image that is HSV image color method to determine the ripeness of fruit based on fruit peel skin through color changes upon ripening. Whereas, odour sensing technique are implemented using sensors array to determine the fruit ripeness through smell changes upon ripening. The “Harumanis” and “Sala” mango was used for sample collection based on two different harvesting condition that is unripe and ripe were evaluated using the image processing and followed by the odour sensor. Support Vector Machine (SVM) is applied as classifier for training and testing based on the data collected from both techniques. The finding shows around 94.69% correct classification using hybrid technique of image processing and odour sensing in a single system.
Volume: 14
Issue: 2
Page: 859-868
Publish at: 2019-05-01

Designing cantilever dimension for low power wireless applications

10.11591/ijeecs.v14.i2.pp758-764
Md Rabiul Awal , Muzammil Jusoh , R. Badlishah Ahmad , Thennarasan Sabapathy , M. Najib M. Yasin , Mohd Hafizuddin Mat
This paper presents the effect of cantilever width on the displacement pattern for low power acoustic energy propagation. A single layer cantilever configuration is used to design the harvester with Lead Zirconate Titanate (PZT-5H). The device is designed with 10×(1 to 10)×0.62 mm dimension. The displacements of the cantilever are obtained through the simulation analysis. The maximum displacements are found of 9.80E-28 mm with the smallest width while minimum displacement is found from 5 mm width. From the results, it is obvious that, smaller width can result larger displacements, however, rectangular and square cantilever shape can be advantageous for low power applications.
Volume: 14
Issue: 2
Page: 758-764
Publish at: 2019-05-01

Android-based automatic detection and measurement system of highway billboard for tax calculation in indonesia

10.11591/ijeecs.v14.i2.pp877-886
Romi Fadillah Rahmat , Sarah Purnamawati , Handra Saito , Muhammad Fariz Ichwan , Tri Murti Lubis
Billboards are objects, tools or actions, which based on the characteristics serve its own purpose to earn profits, advertise certain people or service, and to draw public’s attention by placing it in a very strategic place. It has led the government to charge tax on billboards based on its location, dimensions, and viewpoints. Therefore, authorized parties have to be able to ensure the data authenticity of the proposed billboards. One of the obstacles in data verification is the time of billboards measurement process due to its size and height from the ground, based on this problem, and we developed a system which can measure the dimensions of billboards without physically touching it by implementing image processing methods to identify the billboards. The implementation is by measuring the dimensions of the billboards using perspective concept, then calculates the distance between the camera and the object using two-point distance calculation GPS coordinates. The results showed that the distance calculation using the GPS method generated inaccurate values, whereas the systematic distance method generated a result of errors’ range from 0.5 to 25 cm if the image acquisition is performed nearly perpendicular to the object.
Volume: 14
Issue: 2
Page: 877-886
Publish at: 2019-05-01

The effect of insulator geometrical profile on electric field distributions

10.11591/ijeecs.v14.i2.pp618-627
Ali A. Salem , R. Abd-Rahman , M. S. Kamarudin , H. Ahmed , N.A. M. Jamail , N. A. Othman , M.F. M. Yousof , M. T. Ishak , S. Al-Ameri
In recent years, silicone rubber (SIR) insulators are use widely on high voltage transmission lines, particularly in heavy polluted environment. The performance of SIR in highly dependent on electric field profile that may lead to other serious problem such as ageing and flashover phenomenon. In this paper, electric field and potential distribution around insulator profile were computed using finite element method approach. Insulator geometrical profile i.e. shed radius, inclination angle, width and length has been varied and analyzed. Simulation results reveal that electric field is greatest at area near to the ground and high voltage terminal. Several recommendations have been proposed on insulator profile in achieving optimized electrical performance of the insulator.
Volume: 14
Issue: 2
Page: 618-627
Publish at: 2019-05-01

A concurrent dual-band CMOS low noise amplifier at 2.4/5.2 GHz for WLAN applications

10.11591/ijeecs.v14.i2.pp555-563
S.A.Z. Murad , A. F. Hasan , A. Azizan , A. Harun , J. Karim
This paper presents a concurrent dual-band CMOS low noise amplifier (LNA) at operating frequency of 2.4 GHz and 5.2 GHz for WLAN applications. The proposed LNA employed cascode common source to obtain high gain using 0.13-µm CMOS technology. The concurrent dual-band frequencies are matched using LC network band-pass and band-stop notch filter at the input and output stages. The filters help to shape the frequency response of the proposed LNA. The simulation results indicate that the LNA achieves a forward gain of 21.8 dB and 14.22 dB, input return loss of -18 dB and -14 dB at 2.4 GHz and 5.2 GHz, respectively. The noise figure of 4.1 dB and 3.5 dB with the input third-order intercept points 7 dBm and 10 dBm are obtained at 2.4 GHz and 5.2 GHz, respectively. The LNA dissipates 2.4 mW power at 1.2 V supply voltage with a chip size of 1.69 mm2.
Volume: 14
Issue: 2
Page: 555-563
Publish at: 2019-05-01

The impact of electronic payment on electronic shopping decision in Jordan

10.11591/ijeecs.v14.i2.pp1018-1024
Khaled Aldiabat
Rapid changes in the world of the Internet have led to changes in the electronic markets, especially the speed of information creation compared to normal markets, the reduction of the time between the search and the product, and the ability of the seller and buyer to deal with each other despite the distance between them, The electronic shopping decision depends on the method of payment. This study attempts to measure the effect of e-cards on the decision of e-shopping in Jordan through four aspects, namely: use and reliability, trust and safety, type of e-card and perception. The study reiterated that there is a positive relationship between the use and reliability of electronic cards and the decision of electronic shopping, where the use of electronic cards increases the decision of online shopping, the study also concluded that the type of electronic card and payment method affects the electronic purchase decision (credit card, debit card, prepaid card, cash on delivery).
Volume: 14
Issue: 2
Page: 1018-1024
Publish at: 2019-05-01

2.45 GHz wearable rectenna array design for microwave energy harvesting

10.11591/ijeecs.v14.i2.pp677-687
Syahirah Shawalil , Khairul Najmy Abdul Rani , Hasliza A. Rahim
This paper presents a design of a wearable textile microstrip patch rectifying antenna (rectenna) array operating for wireless body area network (WBAN) at the center frequency, fc of 2.45 GHz.  Precisely, jeans or denim with the relative permittivity,  = 1.70 and thickness of 1.00 mm is chosen as a substrate attached to SheildIt Super as a conductive material with the thickness, h of 0.17 mm and conductivity of 6.67  105 S/m, respectively. In the first stage, a microstrip patch antenna array layout with the inset fed technique is designed and simulated by using the Keysight Advanced Design System (ADS) software.  In the second stage, a wearable textile microstrip patch antenna array is fabricated, integrated, and hidden inside the jeans fabric.  In the third stage, the rectifier circuit layout on the flame retardant-4    (FR-4) printed circuit board (PCB) with the dielectric constant,  = 4.7, thickness, h = 1.6 mm, and loss tangent, δ = 0.018 that can generate radio frequency-direct current (RF-DC) conversion is designed and simulated using the ADS software  Each simulation result and fabrication measurement shows that the designed antenna array characteristics are suitable for an industrial, scientific, and medical radio (ISM) band by having the reflection coefficient, S11 less than -10 decibel (dB) at the respective resonant frequency, fr.  Moreover, through simulation, the output DC voltage for the bridge rectifier circuit is from 132 mV to 5.01 V with the corresponding power conversion efficiency (PCE) between 3.48% and 50.20% whereas for the voltage doubler rectifier, the output DC voltage is from 417 mV to 2.91 V with the corresponding PCE between 34.78% and 53.56%, respectively.
Volume: 14
Issue: 2
Page: 677-687
Publish at: 2019-05-01

An overview of available metamaterial-based antenna for non-invasive hyperthermia cancer treatment

10.11591/ijeecs.v14.i2.pp697-705
Nabilah Abdul Jaffar , Norlida Buniyamin , Kasumawati Lias
This paper presents the outcome of a literature review that an overview of various types of antenna and metamaterial applicator performance towards cancerous tissue or cell for non-invasive hyperthermia cancer treatment (NIHCT) procedure. From the review, it shows that when LHM lens integrated with an antenna, focusing capabilities of the antenna towards the cancerous area can be improved. However, current applicators have a poor focusing effect when directed towards the actual tumor area. In conjunction with that, this paper proposes a new design of modified applicator that is microstrip antenna integrated with left-handed metamaterial (LHM) lens. The antenna termed microstrip-LHM (M-LHM) lens antenna is proposed for use in NIHCT. It is expected to improve the focusing capabilities of an antenna which is used to kill the cancerous area and thus improve the hyperthermia cancer treatment procedure success rate. In addition, this paper provides an overview of heating techniques used in hyperthermia to enhance focusing capabilities and a few metamaterial advantages that can improve the focusing effect and reduced the hot-spots. Specific Absorption Rate (SAR) will be investigated to evaluate the focusing abilities of the proposed applicator using the SEMCAD X Solver.
Volume: 14
Issue: 2
Page: 697-705
Publish at: 2019-05-01

A hypothesis of state covariance decorrelation effects to partial observability SLAM

10.11591/ijeecs.v14.i2.pp588-596
H Ahmad , N.A Othman , M M Saari , M S Ramli , M M Mazlan , T Namerikawa
This paper analyze the performance of partial observability in simultaneous localization and mapping(SLAM) problem. The study focuses mainly on the effect of having a decorrelation technique known as Covariance Inflation to the estimation. The matrix inversion will be the main element to be investigated through two conditions with respect to some defined environment namely as unstable partially observable SLAM and partially observable SLAM via matrix norm analysis. For assessment purposes, the Extended Kalman Filter estimation is referred as the estimator to understand how the conditions can influence the results. The simulation results depicted that, the matrix norm is able to determine the efficiency of estimation and is proportional to the uncertainties of the system.
Volume: 14
Issue: 2
Page: 588-596
Publish at: 2019-05-01
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