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29,734 Article Results

Overview of Soft-Switching DC-DC Converters

10.11591/ijpeds.v9.i4.pp2006-2018
Abdul-Hakeem Mohammed Dobi , Mohd Rodhi Sahid , Tole Sutikno
Application of soft switching in DC-DC converter has achieved a remarkable success in power electronics technology in terms of reduction in switching losses, improve in power density, minimization of electromagnetic interference (EMI) and reduction in the volume of DC-DC converters. Quite a number of soft switching techniques had been reported in the past four decades. This paper aims at providing a review of various soft switching techniques, based on topology, the location of the resonant network, performance characteristics, and principles of operation. In addition, converters area of application, advantages as well as limitations are also highlighted.
Volume: 9
Issue: 4
Page: 2006-2018
Publish at: 2018-12-01

A Survey of Arabic Text Classification Models

10.11591/ijece.v8i6.pp4352-4355
Ahed M. F. Al-Sbou
There is a huge content of Arabic text available over online that requires an organization of these texts. As result, here are many applications of natural languages processing (NLP) that concerns with text organization. One of the is text classification (TC). TC helps to make dealing with unorganized text. However, it is easier to classify them into suitable class or labels. This paper is a survey of Arabic text classification. Also, it presents comparison among different methods in the classification of Arabic texts, where Arabic text is represented a complex text due to its vocabularies. Arabic language is one of the richest languages in the world, where it has many linguistic bases. The researche in Arabic language processing is very few compared to English. As a result, these problems represent challenges in the classification, and organization of specific Arabic text. Text classification (TC) helps to access the most documents, or information that has already classified into specific classes, or categories to one or more classes or categories. In addition, classification of documents facilitate search engine to decrease the amount of document to, and then to become easier to search and matching with queries.
Volume: 8
Issue: 6
Page: 4352-4355
Publish at: 2018-12-01

Packets Wavelets and Stockwell Transform Analysis of Femoral Doppler Ultrasound Signals

10.11591/ijece.v8i6.pp4212-4220
M. Latfaoui , F. Bereksi Reguig
Ultrasonic Doppler signals are widely used in the detection of cardiovascular pathologies or the evaluation of the degree of stenosis in the femoral arteries. The presence of stenosis can be indicated by disturbing the blood flow in the femoral arteries, causing spectral broadening of the Doppler signal. To analyze these types of signals and determine stenosis index, a number of time-frequency methods have been developed, such as the short-time Fourier transform, the continuous wavelets transform, the wavelet packet transform, and the S-transform.
Volume: 8
Issue: 6
Page: 4212-4220
Publish at: 2018-12-01

MRAS Speed Sensorless Vector Control of Induction Motor Drives using Predictive Adaptation Mechanism

10.11591/ijpeds.v9.i4.pp1523-1533
Moustafa Zair , Abdeldjebar Hazzab
Recently of the main topic of research is the sensorless vector control of induction motor drive, In this paper presents the predictive model reference adaptive system (PMRAS) rotor speed observer, This observer developed from the classical MRAS rotor flux scheme associated with predictive adaptation mechanism designed from the Finite Control Set Model Predictive Control (FCS–MPC) by using a search optimization algorithm for calculate the rotor position which guarantee a minimum speed tuning error signal at each sampling period. The effectiveness of the proposed observer proved with the simulation results, show high dynamic performance speed and position observed in sensorless vector control process at low and zero speed as well robustness against motor parameter variation with different loading conditions.
Volume: 9
Issue: 4
Page: 1523-1533
Publish at: 2018-12-01

Geometric and Grayscale Template Matching for Saudi Arabian Riyal Paper Currency Recognition

10.11591/ijece.v8i6.pp4230-4238
Suci Aulia , Bagus Budhi L. , Angga Rusdinar , Yuyun Siti R.
Detecting the authenticity of paper currencies using automated based Paper Currency Recognition (PCR) with image processing techniques was still a hot topic of discussion, due to the circulation of counterfeit currency that was still overwhelming in some countries. There was a downside along with this advancement in technology in the field of color printing, duplication, and scanning, because it was became one of the supporting factors of the increasing crime rate in production of counterfeit money. Our system has performed a PCR approach based on image processing techniques. In this study, the SAR banknote was the object to be recognized and detected its authenticity with the development of the previous method, which was incorporating the Geometric Template Matching and Grayscale Template Matching. In addition to the pattern recognition process, the classification process on 1 SAR, 2 SAR, 5 SAR, and 10 SAR was also performed. From PCR test up to 100 sample data, for each tested banknote value obtained the average value of the best accuracy level from incorporating GeoMatchingScore and GrayMatchingScore for the classification process was 95.25%. While the average level of system accuracy in recognizing counterfeit money on each banknote obtained a maximum value of 100%.
Volume: 8
Issue: 6
Page: 4230-4238
Publish at: 2018-12-01

Optimal Grid-Connected PV System for a Campus Microgrid

10.11591/ijeecs.v12.i3.pp899-906
Mohammed Reyasudin Basir Khan , Jagadeesh Pasupuleti , Jabbar Al-Fattah , Mehrdad Tahmasebi
This paper discusses on the implementation of a grid-connected PV system for university campus in Malaysia. The primary goal of this study is to develop a grid-connected microgrid comprises of Photovoltaic (PV) and a battery storage system to meet the campus load demand and minimize grid dependency. The microgrid modeled and simulated in Hybrid Optimization Model for Electrical Renewable (HOMER) software. Actual load profile and renewable resources were used as an input parameter for the hybrid system. The campus selected is Universiti Kuala Lumpur, British Malaysian Institute as it represents typical load profile for a small campus. Therefore, the results can be used to represent hybrid system development for other small campuses in Malaysia as well. Firstly, optimal sizing of renewable energy (RE) were simulated with respect to total Net Present Cost (NPC) and Cost of Energy (COE). Then, sensitivity analysis conducted to determine the system performance based on changes of load growth, and renewable resources. The results demonstrate optimal HRES combinations for the campus microgrid comprises of 50 kWp of PV generations with 50 kW inverter. However, inclusion of 576 kWh battery storage system will increase the NPC but has higher RE penetration.
Volume: 12
Issue: 3
Page: 899-906
Publish at: 2018-12-01

Direct Torque Control of Two Induction Motors Using the Nine-Switch Inverter

10.11591/ijpeds.v9.i4.pp1552-1564
Draoui Abdelghani , Allaoua Boumediène
The Nine-Switch Inverter(NSI) is a recently developed dual output converter. It can be used to drive two three-phase loads independently. As a substitute to two separate conventional voltage source inverters, the NSI has been, already, proposed in various industrial applications to reduce the numberof semiconductor switches and its associated energy losses and drive circuitry. On the other hand, the Direct Torque Control(DTC) is a robust control scheme of AC motors, which consist of selecting proper state vectors of a conventional voltage source inverter. The NSI, having a different working principle from the conventional voltage source inverter and taking into account the varying influence of active space vectors on motor’s torque and stator flux, a Direct Torque Control is suggested in this paper to, efficiently, drive two induction motors independently, while minimizing the torque and stator flux ripples of both motors. Simulations results confirm the effectiveness of the proposed algorithm. In addition, application of this newly proposed control scheme in operation of an Electric Vehicule(EV) is demonstrated.
Volume: 9
Issue: 4
Page: 1552-1564
Publish at: 2018-12-01

Adding Psychological Factor in the Model of Electricity Consumption in Office Building

10.11591/ijece.v8i6.pp4486-4495
Meredita Susanty
Researches indicate that energy behaviour is the key to energy conservation and suggest that comparative feedback on energy usage can generate savings in residential and organizational settings. In implementing comparative feedback in workplace, there are two different ways to disaggregate collective energy consumption and apportion it to building users; individual or group level. This research uses agent-based modelling and simulation to examine the impact of applying different approaches of energy data apportionment to change staff behaviour toward energy consumption reduction. A simulation model of energy consumption in workplace as a base model is a re-implementation and simplification from former research. Several psychological factors and decision-making mechanism are then being added as an extension. The model divides staffs into four energy awareness stereotypes based on motivation level. Sensitivity analysis suggests that motivation is an important factor in changing user‟s behaviour and the experiment results indicates greater potential for energy saving when energy usage is apportioned to group level. The significant difference of energy consumption level makes user with low and medium motivation should become the target of energy reduction campaign.
Volume: 8
Issue: 6
Page: 4486-4495
Publish at: 2018-12-01

Enlarge Medical Image using Line-Column Interpolation (LCI) Method

10.11591/ijece.v8i5.pp3620-3626
Jufriadif Na'am , Julius Santony , Yuhandri Yuhandri , Sumijan Sumijan , Gunadi Widi Nurcahyo
Quality of medical image has an important role in constructing right medical diagnosis. This paper recommends a method to improve the quality of medical images by increasing the size of the image pixels. By increasing the size of pixels, the size of the objects contained therein is also greater, making it easier to observe. In this study medical images of Brain CT-Scan, Chest X-Ray and Panoramic X-Ray were processed using Line-Column Interpolation (LCI) Method. The results of the treatment are then compared to Nearest Neighbor Interpolation (NNI), Bilinear Interpolation (BLI) and Bicubic Interpolation (BCI) processing results. The experiment shows that Line-Column Interpolation Method produces a larger image with details of the objects in it are not blurred and has equal visual effects. Thus, this method is expected to be a reference material in enlarging the size of the medical image for ease in clinical analysis.
Volume: 8
Issue: 5
Page: 3620-3626
Publish at: 2018-12-01

The Effects of Pre-service Teachers’ Cognitive Styles on Learning Approaches

10.11591/ijere.v7i4.15737
Sedat Altıntaş , İzzet Görgen
The main purpose of the study is to investigate the effects of prospective teachers’ cognitive styles on learning approaches. It is aimed to define whether exist significance differences between defining prospective teachers’ cognitive styles and learning approaches and demographic variables within the scope of the mean purpose. The study, designed according to correlational survey model, was conducted at Mugla Sitki Kocman University, Faculty of Education in the 2014-2015 academic year spring semester. As data collection instruments, “The Group Embedded Figures Test” was administered to define prospective teachers’ cognitive style in the study. On the other hand “The Revised Two Factor Study Process Questionnaire” was used to reveal prospective teachers’ learning approaches. According to the findings, prospective teachers generally have field dependent cognitive style. It is determined that between with prospective teachers’ gender and academic success and cognitive style scores there isn’t any significant difference revealed. However, there is significant difference between branches and cognitive style scores. It has been viewed that prospective teachers prefer deep learning approach generally. There isn’t significant difference between gender and learning approaches yet there is significant difference between learning approaches-branches and academic success. It is also concluded that as prospective teachers’ cognitive styles approaches to field independent, deep learning approach preference of prospective teachers has diminished.
Volume: 7
Issue: 4
Page: 285-293
Publish at: 2018-12-01

A Novel Intelligence-based e-Procurement System to offer Maximum Fairness Index in Ongoing Auction Process

10.11591/ijece.v8i6.pp4438-4447
N. Madhusudan , L. Manjunatha Rao
A perfect auction policy is one of the most strategic elements that contribute to success factor for any e-Procurement system. An auction policy can be only term as an effective if it really offer win-win situation to both the bidder as well as to the merchant. After reviewing existing studies on e-Procurement system, it is found that there isno effective research work focusing on this point and maximum research contribution has limited its scope to certain application or case studis. Hence, the proposed system introduces a novel e-Procurement system which is equipped by an itelligence-building process for performing predictive analysis of ongoing auction process. A mathematical modelling is implemented where all teh variables have been formed using practical implementation of auction system and followed by optimization process using regression-based approach. The study outcome shows that proposed system offers better response time and higher predictive accuracy in contrast to existing approaches.
Volume: 8
Issue: 6
Page: 4438-4447
Publish at: 2018-12-01

Smart Walking Stick for the Visually Challenged

10.11591/ijeecs.v12.i3.pp1282-1288
Mohammed Ahsan , Rishav Drolia , Ananda Kumar S
Internet of things mixed with Radio Frequency identification generation permit a whole new context for whole new devices that are capable of combining their bodily and virtual existences. Radio Frequency identification, placing an identification label into every object, allows a clever device to get information, both actual-time or digital-connected statistics, without any physical touch. Information retrieved from such an object, turns it right into a capacity smart object, clearly able to car pick out itself and, if protection problems are certainly handled, maximum in all likelihood capable to connect to the worldwide net. This way, one can get a ubiquitous framework to get admission to, display and manipulate any of these smart items over a web of linked things. RFID tags in scientific context enable a fast and specific identification of each clever entity, permitting a ubiquitous and brief get admission to personal fitness data over an internet of factors [1-2]. People have been struggling with sicknesses weird. Visually challenged human beings are blind people who are very common and difficult to cope with of their way. The principle aim of this project is to aid the visually challenged human beings with a better navigation device. This clever strolling stick is greater state-of-the-art device with many embedded features.
Volume: 12
Issue: 3
Page: 1282-1288
Publish at: 2018-12-01

QoS Management in WSN-MCN Convergence Network Using Priority Based Traffic Models

10.11591/ijeecs.v12.i3.pp1159-1170
Anita Swain , Arun Kumar Ray
Technological advancements and increased developments leads to increase the development of hand-held devices which encourage the growth of Machine-to-Machine (M2M) communication. In this context devices belongs to heterogeneous network require a common platform to meet the challenges of data centric wireless services and applications. To satisfy the needs of M2M communication, Mobile Cellular Network (MCN) and Wireless Sensor Network (WSN) converged to a single platform. In this paper two priority models has been proposed with non preemptive priority and preemptive priority to analyze the data traffic at MAC layer of the converged network. The performance matrices are determined to maintain QoS in terms of reduced dropping and blocking probability, waiting time in the queue etc. Finally, the proposed models are compared in terms of QoS factors.
Volume: 12
Issue: 3
Page: 1159-1170
Publish at: 2018-12-01

Hilbert Based Testing of ADC Differential Non-linearity Using Wavelet Transform Algorithms

10.11591/ijece.v8i6.pp5071-5079
Emad A. Awada
In testing Mixed Signal Devices such as Analog to Digital and Digital to Analog Converters, some dynamic parameters, such as Differential Non-Linearity and Integral Non-linearity, are very critical to evaluating devises performance. However, such analysis has been notorious for complexity and massive compiling process. Therefore, this research will focus on testing dynamic parameters such as Differential Non-Linearity by simulating numerous numbers of bits Analog to Digital Converters and test the output signals base on new testing algorithms of Wavelet transform based on Hilbert process. Such a new testing algorithm should enhance the testing process by using less compiling data samples and prompt testing results. In addition, new testing results will be compared with the conventional testing process of Histogram algorithms for accuracy and enactment.
Volume: 8
Issue: 6
Page: 5071-5079
Publish at: 2018-12-01

A Context-based Numeral Reading Technique for Text to Speech Systems

10.11591/ijece.v8i6.pp4533-4544
Soumya Priyadarsini Panda , Ajit Kumar Nayak
This paper presents a novel technique for context based numeral reading in Indian language text to speech systems. The model uses a set of rules to determine the context of the numeral pronunciation and is being integrated with the waveform concatenation technique to produce speech out of the input text in Indian languages. For this purpose, the three Indian languages Odia, Hindi and Bengali are considered. To analyze the performance of the proposed technique, a set of experiments are performed considering different context of numeral pronunciations and the results are compared with existing syllable-based technique. The results obtained from different experiments shows the effectiveness of the proposed technique in producing intelligible speech out of the entered text utterances compared to the existing technique even with very less storage and execution time.
Volume: 8
Issue: 6
Page: 4533-4544
Publish at: 2018-12-01
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