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27,438 Article Results

Prediction of a New Cascaded Hybrid Multilevel Inverter with Less Device Count

10.11591/ijeecs.v1.i2.pp273-281
C.R. Balamurugan , S.P. Natarajan , R. Bensraj
Multilevel inverters have been opted for high power applications due to reduced harmonic distortion, less device voltage stress and modular structure. This work proposes new modified hybrid H-bridge multilevel inverter using auxiliary switch. This proposed inverter produces five levels output with five power devices and clamping diodes as a phase voltage and nine levels as a line voltage.The levels of the inverters are decided based on the phase voltage not on the line voltage. In this paper the performance of the proposed inverter are measured in terms of line voltage. However, by increase in the number of levels the proposed inverter with reduced number of switches produces low switching losses and improves the efficiency of the inverter. This method achieves the variation of Total Harmonic Distortion (THD) in the inverter and output voltage is observed for various modulation indices. Simulation is performed using MATLAB-SIMULINK for line to line output voltage. Variable Amplitude Phase Disposition (VAPD) strategy provides output with relatively low distortion for all the strategies. It is also seen that VAPOD is found to perform better for all strategies since it provides relatively higher fundamental RMS output voltage.
Volume: 1
Issue: 2
Page: 273-281
Publish at: 2016-02-01

Several Mode-Locked Pulses Generation and Transmission over Soliton Based Optical Transmission Link

10.11591/ijeecs.v1.i2.pp288-293
IS Amiri , SE Alavi
A soliton-based optical communication system is presented to generate and transmits several mode locked laser pulses (generated by fiber laser setup) over 50 km fiber and 120 m wireless link. The passive mode-locking feature of the laser system proposed in this paper is based on nonlinear polarization rotation evolution.
Volume: 1
Issue: 2
Page: 288-293
Publish at: 2016-02-01

Semantic Similarity/Relatedness for Cross Language Plagiarism Detection

10.11591/ijeecs.v1.i2.pp371-374
Hanane Ezzikouri , Mohammed Erritali , Mohamed Oukessou
Generally utterances in natural language are highly ambiguous, and a unique interpretation can usually be determined only by taking into account the context in the utterance occurred. Automatically determining the correct sense of a polysemous word is a complicated problem especially in multilingual corpuses. This paper presents an application programming interface for several Semantic Relatedness/Similarity metrics measuring semantic  similarity/distance  between multilingual words  and  concepts, in order to use it after for sentences and paragraphs in Cross Language Plagiarism Detection (CLPD); using WordNet for the English-French and English-Arabic multilingual plagiarism cases.
Volume: 1
Issue: 2
Page: 371-374
Publish at: 2016-02-01

Research on the Surface Fractal Characteristic of the Rock with Rockburst Proneness

10.11591/ijeecs.v1.i2.pp349-353
Li Mo-xiao , Zhang Guang , Chen Jing-xi
In order to strengthen the prediction of rockburst and inquire the relationship between the rockburst proneness of rock and its surface fractal characteristic, the surface fractal of the rock was studied by fractal method and uniaxial compression test. The change rules of surface fractal of different types of rock were compared by calculating its fractal dimension of rock before experiment and after experiment. Based on this, we found that the dimension after test is bigger than before test for four kinds of rocks. The rock with stronger rockburst proneness has more intense failure in the loading process and its crack morphology is more complex.
Volume: 1
Issue: 2
Page: 349-353
Publish at: 2016-02-01

Tuning of PID Controller for Load Frequency Control Problem via Harmony Search Algorithm

10.11591/ijeecs.v1.i2.pp255-263
M. Omar , M. A. Ebrahim , A. M. Abdel Ghany , F. Bendary
In this paper, a new artificial intelligence technique, Harmony Search (HS), will be used for the optimization of a classical order PID for a two-area load frequency control (LFC) model using the participation factor concept. The HS has four main variants, these variants had been used for the optimization of classical order PID controllers in case of centralized control scheme, the results had been compared to select and recommend the best HS variant. Then, this best HS variant had been used for the tuning of PID controllers in case of decentralized scheme.
Volume: 1
Issue: 2
Page: 255-263
Publish at: 2016-02-01

QoS Design Consideration for Enterprise and Provider’s Network at Ingress and Egress Router for VoIP protocols

10.11591/ijece.v6i1.pp235-241
Manjur Kolhar , Mosleh M Abualhaj , Faiza Rizwan
Compliance with the Service Level Agreement (SLA) metric is a major challenge in a Multiprotocol Label Switching Virtual Private Network (MPLS VPN) because mandatory models must be maintained on both sides of the MPLS VPN in order to achieve end-to-end service levels. The end-to-end service of an MPLS VPN can be degraded owing to various issues such as distributed denial of service (DDoS), and Random Early Detection (RED) that prevents congestion and differentiates between legitimate and illegitimate user traffic. In this study, we propose a centralized solution that uses a SLA Violation Detector (SLAVD) and intrusion detection to prevent SLA violation.
Volume: 6
Issue: 1
Page: 235-241
Publish at: 2016-02-01

Prediction Data Processing Scheme using an Artificial Neural Network and Data Clustering for Big Data

10.11591/ijece.v6i1.pp330-336
Se-Hoon Jung , Jong-Chan Kim , Chun-Bo Sim
Various types of derivative information have been increasing exponentially, based on mobile devices and social networking sites (SNSs), and the information technologies utilizing them have also been developing rapidly. Technologies to classify and analyze such information are as important as data generation. This study concentrates on data clustering through principal component analysis and K-means algorithms to analyze and classify user data efficiently. We propose a technique of changing the cluster choice before cluster processing in the existing K-means practice into a variable cluster choice through principal component analysis, and expanding the scope of data clustering. The technique also applies an artificial neural network learning model for user recommendation and prediction from the clustered data. The proposed processing model for predicted data generated results that improved the existing artificial neural network–based data clustering and learning model by approximately 9.25%.
Volume: 6
Issue: 1
Page: 330-336
Publish at: 2016-02-01

Design and Simulation for UHF oscillator using SAWR with different schematics

10.11591/ijeecs.v1.i2.pp294-299
M M Elsherbini , M F Elkordy , A M Gomaa
Various schematics for colpitts oscillator with fixed ultra-high frequency using either LC tank circuits or one port surface acoustic wave resonator are presented. Four circuits used to achieve 433.9 MHz oscillating frequency, Two of them using NPN Bipolar junction transistor, while the others using operational amplifier with high speed, gain and accuracy. A comparison between using passive elements as a source of resonance frequency and using SAW resonator is introduced. Another comparison between using an equivalent lumped circuit instead of SAWR package in oscillator design is also introduced. Two different software tools are used to achieve the required simulation. Proteus and ADS tools are used in simulation with AC, S-parameters and hybrid simulation. This paper is considered a direct application for SAW resonators in wide bandwidth ASK Transmitter / Receiver.
Volume: 1
Issue: 2
Page: 294-299
Publish at: 2016-02-01

A Overlapping Carrier Based SPWM for a 5-Level Cascaded H-bridge Multilevel Inverter

10.11591/ijeecs.v1.i2.pp221-228
Kureve D. Teryima , Goshwe Y. Nentawe , Agbo O. David
This paper proposes a switching control for a cascaded H-bridge inverter structure with reduced switches which is used to improve the THD performance of a single phase five level CHB MLI. The multi level inverter is simulated for the conventional carrier overlapping APOD and the proposed carrier overlapping APOD Pulse Width Modulation (PWM) switching control technique. The total harmonic distortion (THD) of the output voltages are observed for both PWM control techniques. The performance of the symmetric CHB MLI is simulated using MATLAB-SIMULINK. It is observed that the proposed carrier overlapping APODPWM provides output with relatively low THD as compared to the conventional carrier overlapping APODPWM.
Volume: 1
Issue: 2
Page: 221-228
Publish at: 2016-02-01

An Interactive Mobile Augmented Reality for Tourism Objects at Purbalingga District

10.11591/ijeecs.v1.i2.pp375-380
Imam Tahyudin , Dhanar Intan Surya Saputra , Haviluddin Haviluddin
This paper presents the development of an interactive mobile Augmented Reality (AR) for tourism promotion with eXtreme programming (XP) at Purbalingga district, Central Java that has many places of tourism attractions such as Owabong, Purbasari Pancuran Mas, Sanggaluri Park and BuperMunjuluhur. By applying the AR concept, it is expected the tourism objects could be enhanced by augmenting the virtual brochures which could be viewed over a mobile device. In this study, mobile device Android platform is used to display interactive brochures of tourism promotioncontaining 3D models, animations, and sounds. The brochure provides information in of real attractions of the tourism objects in Purbalingga district.
Volume: 1
Issue: 2
Page: 375-380
Publish at: 2016-02-01

On Sparse Compression Complexity of Speech Signals

10.11591/ijeecs.v1.i2.pp329-340
Ahmed Omara , Alaa Hefnawy , Abdelhalim Zekry
In this paper, we have addressed the issue of the sparse compression complexity for the speech signals. First of all, this work illustrated the effect of the signal length on the complexity levels of Matching Pursuit (MP) and Orthogonal Matching Pursuit (OMP) algorithms. Also, this paper introduced a study of possibility to reduce that complexity by exploiting the shared atoms among the contiguous speech compressions. By comparing the shared atoms levels and a threshold level induced by an analytic model based on the both the central and non-central hyper-geometric distributions, we proved the ability of the shared atoms criterion to detect if there is biasing towards a subspace of atoms or not, and to decide if the biasing occurs due to the redundancy in the dictionary of atoms, or due to the redundancy in the signal itself. Moreover, we suggested a subspace bias-based approaches for complexity reduction called "Atoms Reuse" and "Active Cluster". Both methods exploits the higher levels of the shared atoms to reduce the compression complexity by reducing the search space during the pursuit iterations.
Volume: 1
Issue: 2
Page: 329-340
Publish at: 2016-02-01

The Performance of Dynamic-static Spectrum Access Based on Markov Transfer Model

10.11591/ijeecs.v1.i2.pp354-364
Changbiao Xu , Lianjun Zhu
This study presented a non-synchronized random access mechanism that supports dynamic-static spectrum. Generally, the authorized users of two networks (network A and network B) with different frequency bands communicate with each other by using static spectrum. When congestion happened, spectrum holes in their networks can be detected by the opposite networks and then utilized to communicate. Based on queuing theory and Markov transfer model, a user behavior characterized by dynamic-static spectrum access was proposed, and the feasibility of this theoretical model was validated through analog simulation. Thereafter, the theoretical parameters of system performance, like blocking possibility, forced drop-call possibility, and throughput, were measured and compared between dynamic-static mode and unconjugated mode.
Volume: 1
Issue: 2
Page: 354-364
Publish at: 2016-02-01

The Noise Reduction over Wireless Channel Using Vector Quantization Compression and Filtering

10.11591/ijece.v6i1.pp130-138
Iman Elawady , Abdelmounaim Moulay Lakhdar , Khelifi Mustapha
The transmission of compressed data over wireless channel conditions represents a big challenge. The idea of providing robust transmission gets a lot of attention in field of research. In this paper we study the effect of the noise over wireless channel. We use the model of Gilbert-Elliot to represent the channel. The parameters of the model are selected to represent three cases of channel. As data for transmission we use images in gray level size 512x512. To minimize bandwidth usage we compressed the image with vector quantization also in this compression technique we study the effect of the codebook in the robustness of transmission so we use different algorithms to generate the codebook for the vector quantization finally we study the restoration efficiency of received image using filtering and indices recovery technique.
Volume: 6
Issue: 1
Page: 130-138
Publish at: 2016-02-01

Modelling and Design of Inverter Threshold Quantization based Current Comparator using Artificial Neural Networks

10.11591/ijece.v6i1.pp320-329
Veepsa Bhatia , Neeta Pandey , Asok Bhattacharyya
Performance of a MOS based circuit is highly influenced by the transistor dimensions chosen for that circuit. Thus, proper dimensioning of the transistors plays a key role in determining its overall performance.  While choosing the dimension is critical, it is equally difficult, primarily due to complex mathematical formulations that come into play when moving into the submicron level. The drain current is the most affected parameter which in turn affects all other parameters. Thus, there is a constant quest to come up with techniques and procedure to simplify the dimensioning process while still keeping the parameters under check. This study presents one such novel technique to estimate the transistor dimensions for a current comparator structure, using the artificial neural networks approach. The approach uses Multilayer perceptrons as the artificial neural network architectures. The technique involves a two step process. In the first step, training and test data are obtained by doing SPICE simulations of modelled circuit using 0.18μm TSMC CMOS technology parameters. In the second step, this training and test data is applied to the developed neural network architecture using MATLAB R2007b.
Volume: 6
Issue: 1
Page: 320-329
Publish at: 2016-02-01

An Effective Cable Sizing Procedure Model for Industries and Commerial Buildings

10.11591/ijece.v6i1.pp34-39
M. Pratap Nair , K. Nithiyananthan
This paper mainly focuses on the cable sizing methods and calculation of electrical cables according to the various international standards. For instance, International Electrotechnical Commission (IEC), National Electrical Code (NEC), British Standard (BS) and Institute of Electrical and Electronics Engineers (IEEE). The basic philosophy underlying any cable sizing calculations are the same. The main objective of this research work is to develop effective cable sizing model for building services.
Volume: 6
Issue: 1
Page: 34-39
Publish at: 2016-02-01
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