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30,735 Article Results

Performance Improvement of MIMO-OSTBC System with BCH-TURBO Code In Rayleigh Fading Channel

10.11591/ijeecs.v11.i3.pp898-907
SOFI Naima , FATIMA Debbat , Fethi Tarik Bendimerad
Recently, OSTBCs has become a widespread technique for signal transmission over wireless channels because of their diversity gain, but there are not designed to achieve an additional coding gain. Hence, OSTBCs must be concatenated with an external code which allows a significant coding gain.FEC (forward error correction) is a technique used for detecting and possibly correcting errors that can occur when messages are transmitted through a digital communication system, also for rendering the information more reliable. Thus, with staffing these coding techniques that are able to reach Shannon limits, in  MIMO systems, better performances can be achieved by taking advantages of  diversity and coding gains. The objective of this paper is to compare different FEC codes in Rayleigh fading channel and propose an appropriate code for MIMO-OSTBC systems. The simulation results reveal the performance of the proposed model
Volume: 11
Issue: 3
Page: 898-907
Publish at: 2018-09-01

Cube Arithmetic: Improving Euler Method for Ordinary Differential Equation using Cube Mean

10.11591/ijeecs.v11.i3.pp1109-1113
Nooraida Samsudin , Nurhafizah Moziyana Mohd Yusop , Syahrul Fahmy , Anis Shahida Niza binti Mokhtar
The Euler method is a first-order numerical procedure for solving Ordinary Differential Equation (ODEs) problems. It is an effective and easy method to solve initial value problems. Although Euler provides simple procedure for solving ODEs, there have been issues such as complexity, time of processing and accuracy that compelled the use of other, more complex, methods. Improvements to the Euler method have attracted much attention resulting in numerous modified Euler methods. This paper proposes Cube Arithmetic, a modified Euler method with improved accuracy. The efficiency of Cube Arithmetic was compared with Euler Arithmetic and tested using SCILAB against exact solutions. Results indicate that not only Cube Arithmetic provided solutions that are similar to exact solutions at small step size, but also at higher step size, hence producing more accurate results.
Volume: 11
Issue: 3
Page: 1109-1113
Publish at: 2018-09-01

Comparative Performance of Machine Learning Algorithms for Cryptocurrency Forecasting

10.11591/ijeecs.v11.i3.pp1121-1128
Nor Azizah Hitam , Amelia Ritahani Ismail
Machine Learning is part of Artificial Intelligence that has the ability to make future forecastings based on the previous experience. Methods has been proposed to construct models including machine learning algorithms such as Neural Networks (NN), Support Vector Machines (SVM) and Deep Learning. This paper presents a comparative performance of Machine Learning algorithms for cryptocurrency forecasting. Specifically, this paper concentrates on forecasting of time series data. SVM has several advantages over the other models in forecasting, and previous research revealed that SVM provides a result that is almost or close to actual result yet also improve the accuracy of the result itself. However, recent research has showed that due to small range of samples and data manipulation by inadequate evidence and professional analyzers, overall status and accuracy rate of the forecasting needs to be improved in further studies. Thus, advanced research on the accuracy rate of the forecasted price has to be done.
Volume: 11
Issue: 3
Page: 1121-1128
Publish at: 2018-09-01

Analysing Event-Related Sentiments on Social Media with Neural Networks

10.11591/ijai.v7.i3.pp119-124
P. Santhi Priya , T. Venkate swara Rao
Sentiment analysis is performed to determine the polarity of opinion on a subject. It has been applied to text corpora such as movie reviews, financial documents to glean information about overall-sentiment anc produce actionable data. Recent events have demonstrated that polling can be sometimes unreliable. People can be difficult to access through conventional polling methods and less than frank in polls. In the era of social media, voters are likely to more freely express their opinion on social media forums about divisive events especially in media where anonymity exists. Analyzing the prevailing opinion on these forums can indicate if there are any deficiencies in polling and can be a valuable addition to conventional polling. We analyzed text corpora from Reddit forums discussing the recent referendum in Britain to exit from the EU (known as Brexit). Brexit was an important world event and was very divisive in the run-up and post vote. We analyzed sentiment in two ways: Initially we tried to gauge positive, negative, and neutral sentiments. In the second analysis, we further split these sentiments into six different polarities based on the directionality of the positive and negative sentiments (for or against Brexit). Our technique utlilized paragraph vectors (Doc2Vec) to construct feature vectors for sentiment analysis with a Multilayer Perceptron classifier. We found that the second analysis yielded overall better results; although, our classifier didn’t perform as well in classifying positive sentiments. We demonstrate that it is possible glean valuable information from complicated and diverse corpora such as multi-paragraph comments from reddit with sentiment analysis.
Volume: 7
Issue: 3
Page: 119-124
Publish at: 2018-09-01

A New Adaptive Anti-windup Controller for Wind Energy Conversion System Based on PMSG

10.11591/ijpeds.v9.i3.pp1321-1329
Ed-dahmani Chafik , Mahmoudi Hassane , Bakouri Anass , El Azzaoui Marouane
In this paper, an adaptive anti-windup control strategy for permanent magnet synchronous generator dedicated for wind energy conversion systems. The proposed control has the advantage to suppress the performance deterioration caused by the overshooting phenomenon, and optimize the controller gains using the particle swarm optimization algorithm. The scheme of the speed controller is implemented on field orientation control in the generator side converter. A simulation of the proposed scheme is carried out in SIMULINK-MATLAB in order to evaluate the effectiveness of the control against the saturation and the parameter optimization.
Volume: 9
Issue: 3
Page: 1321-1329
Publish at: 2018-09-01

Adaptive Controllers for Enhancement of Stand-Alone Hybrid System Performance

10.11591/ijpeds.v9.i3.pp979-986
Yew Weng Kean , Agileswari Ramasamy , Shivashankar Sukumar , Marayati Marsadek
This paper presents a stand-alone hybrid renewable energy system (SHRES) consisting of solar photovoltaic (PV), wind turbine (WT) and battery energy storage (BES) in an effort reduce the dependence on fossil fuels. The renewable energy sources have individual inverters and the PV inverter of the SHRES is operated using active and reactive power control. The PV inverter have two main control structures which are active power control and reactive power control and each contain a proportional integral (PI) controller. Accurate control of the PV inverter’s active power is essential for PV curtailment applications. Thus, this paper aims to enhance the performance of the SHRES in this work by optimizing the performance of the PV inverter’s active power PI controller parameters through the design of adaptive controllers. Therefore, an adaptive controller and an optimized adaptive controller are proposed in this paper. The performances of the proposed controllers are evaluated by minimizing the objective function which is the integral of the time weighted absolute error (ITAE) criterion and this performance is then compared with a controller that is tuned by the traditional trial and error method. Simulation results showed that the optimized adaptive controller is better as it recorded an error improvement of 42.59%. The dynamic optimized adaptive controller is more adept at handling the fast changes of the SHRES operation.
Volume: 9
Issue: 3
Page: 979-986
Publish at: 2018-09-01

Comparison between Fuzzy Logic and PI Control for The Speed Of BLDC Motor

10.11591/ijpeds.v9.i3.pp1116-1123
Akram H. Ahmed , Abd El Samie B. Kotb , Ayman M. Ali
In this paper the analytical comparison of brushless DC (BLDC) motor drive with proportional integral (PI) and fuzzy logic controller (FLC) based speed controllers is estimated. Proportional integral (PI) has disadvantages like it do not operate properly when the system has a high degree of load disturbances. In recent years, the application of fuzzy logic controller (FLC) for high dynamic performance of motor drives has become an important tool. FLC is a good for load disturbances and can be easily implemented. The modeling and simulation of both the speed controllers have been made by MATLAB/SIMULINK. The dynamic characteristics of the BLDC motor (speed and torque) response, obtained under PI and Fuzzy logic based speed controller, are compared for various operating condition.
Volume: 9
Issue: 3
Page: 1116-1123
Publish at: 2018-09-01

An Improved Flexible Partial Histogram Bayes Learning Algorithm

10.11591/ijeecs.v11.i3.pp975-986
Haider O. Lawend , Anuar Muad , Aini Hussain
This paper presents a proposed supervised classification technique namely flexible partial histogram Bayes (fPHBayes) learning algorithm. In our previous work, partial histogram Bayes (PHBayes) learning algorithm showed some advantages in the aspects of speed and accuracy in classification tasks. However, its accuracy declines when dealing with small number of instances or when the class feature distributes in wide area. In this work, the proposed fPHBayes solves these limitations in order to increase the classification accuracy. fPHBayes was analyzed and compared with PHBayes and other standard learning algorithms like first nearest neighbor, nearest subclass mean, nearest class mean, naive Bayes and Gaussian mixture model classifier. The experiments were performed using both real data and synthetic data considering different number of instances and different variances of Gaussians. The results showed that fPHBayes is more accurate and flexible to deal with different number of instances and different variances of Gaussians as compared to PHBayes.
Volume: 11
Issue: 3
Page: 975-986
Publish at: 2018-09-01

Joint Fixed Power Allocation and Partial Relay Selection Schemes for Cooperative NOMA

10.12928/telkomnika.v16i5.9812
Thanh-Tien; Industrial University of Ho Chi Minh City Do , Dinh-Thuan; Ton Duc Thang University Do , Minh-Sang Van; Industrial University of Ho Chi Minh City Nguyen
 In the future wireless systems, non-orthogonal multiple-access (NOMA) with partial relay selection scheme is considered as developing research topic. In this paper, dual-hop relaying systems is deployed for NOMA, in which the signal is transfered with the assistance of decode-and-forward (DF) scheme. This paper presents exact expressions for outage probability over independent Rayleigh fading channels, and two partial relay selection schemes are provided. Using matching analytical result and Monte-Carlo method, we introduce forwarding strategy selection for fixed user allocation and exactness of derived formula is checked. The presented simulations confirm the the advantage of such considered NOMA, and the effectiveness of the proposed forwarding strategy.
Volume: 16
Issue: 5
Page: 1957-1965
Publish at: 2018-08-10

Feature Selection Approach based on Firefly Algorithm and Chi-square

10.11591/ijece.v8i4.pp2338-2350
Emad Mohamed Mashhour , Enas M. F. El Houby , Khaled Tawfik Wassif , Akram I. Salah
Dimensionality problem is a well-known challenging issue for most classifiers in which datasets have unbalanced number of samples and features. Features may contain unreliable data which may lead the classification process to produce undesirable results. Feature selection approach is considered a solution for this kind of problems. In this paperan enhanced firefly algorithm is proposed to serve as a feature selection solution for reducing dimensionality and picking the most informative features to be used in classification. The main purpose of the proposedmodel is to improve the classification accuracy through using the selected features produced from the model, thus classification errors will decrease. Modeling firefly in this research appears through simulating firefly position by cell chi-square value which is changed after every move, and simulating firefly intensity by calculating a set of different fitness functionsas a weight for each feature. K-nearest neighbor and Discriminant analysis are used as classifiers to test the proposed firefly algorithm in selecting features. Experimental results showed that the proposed enhanced algorithmbased on firefly algorithm with chi-square and different fitness functions can provide better results than others. Results showed that reduction of dataset is useful for gaining higher accuracy in classification.
Volume: 8
Issue: 4
Page: 2338-2350
Publish at: 2018-08-01

A Micro-Scale Cyclone-Wind Turbine for Rooftop Ventilator

10.11591/ijeecs.v11.i2.pp614-621
Unggul Wibawa , Akhmad Frandicahya Permadi , Rini Nur Hasanah
This paper analyzes the model of a cyclone-turbine for a micro-scale wind-power system being motivated by an idea to harvest the abandoned energy from rooftop ventilators. The system under consideration has been equipped with a battery to form a wind-battery power system. Data obtained from a wind site observation have been used to calculate the potentially generated power and efficiency, as well as the mechanical and electrical designs to extract the energy. The design has been explored to obtain the best efficiency of the cyclone-turbine model. The impact of wind-speed variation on the resulted system output has been investigated during the charging process of battery. The conclusion emphasizes the relationship between the output power and the range values of the resulted current and voltage, as well as the optimum wind speed-range of the cyclone-turbine operation.
Volume: 11
Issue: 2
Page: 614-621
Publish at: 2018-08-01

A Neural Network Approach to Identify Hyperspectral Image Content

10.11591/ijece.v8i4.pp2115-2125
Puttaswamy Malali Rajegowda , Balamurugan P.
A Hyperspectral is the imaging technique that contains very large dimension data with the hundreds of channels. Meanwhile, the Hyperspectral Images (HISs) delivers the complete knowledge of imaging; therefore applying a classification algorithm is very important tool for practical uses. The HSIs are always having a large number of correlated and redundant feature, which causes the decrement in the classification accuracy; moreover, the features redundancy come up with some extra burden of computation that without adding any beneficial information to the classification accuracy. In this study, an unsupervised based Band Selection Algorithm (BSA) is considered with the Linear Projection (LP) that depends upon the metric-band similarities. Afterwards Monogenetic Binary Feature (MBF) has consider to perform the ‘texture analysis’ of the HSI, where three operational component represents the monogenetic signal such as; phase, amplitude and orientation. In post processing classification stage, feature-mapping function can provide important information, which help to adopt the Kernel based Neural Network (KNN) to optimize the generalization ability. However, an alternative method of multiclass application can be adopt through KNN, if we consider the multi-output nodes instead of taking single-output node.
Volume: 8
Issue: 4
Page: 2115-2125
Publish at: 2018-08-01

Microcontroller-based Vertical Farming Automation System

10.11591/ijece.v8i4.pp2046-2053
Shomefun Tobi Emmanuel , Awosope Claudius O. A. , Ebenezer O. Diagi
Food is a basic necessity of life. It is the means by which man is nourished and strengthened to carry out his daily activities. The need for food for the upkeep of man has placed agriculture at the helm of man’s affairs on earth. With a rapidly increasing population on earth, man has invented newer and innovative ways to cultivate crops. This cultivation is mainly concentrated in rural areas of countries around the world; but with the massive urbanization happening in the world today; it is becoming increasingly difficult to have enough agricultural produce that will cater for the massive population. Taking Nigeria as a case study, the increased urbanization has placed a massive demand on land, energy and water resources within urban areas of the country. Majority of the food consumed in the urban areas is cultivated in the rural areas. This system however requires longer transportation times from rural areas to urban areas which lead to contamination and spoilage in many instances. This research paper provides a solution in which food crops can be cultivated easily in urban areas by planting in vertically stacked layers in order to save space and use minimal energy and water for irrigation.
Volume: 8
Issue: 4
Page: 2046-2053
Publish at: 2018-08-01

Impact of Packet Inter-arrival Time Features for Online Peer-to-Peer (P2P) Classification

10.11591/ijece.v8i4.pp2521-2530
Bushra Mohammed Ali Abdalla , Mosab Hamdan , Mohammed Sultan Mohammed , Joseph Stephen Bassi , Ismahani Ismail , Muhammad Nadzir Marsono
Identification of bandwidth-heavy Internet traffic is important for network administrators to throttle high-bandwidth application traffic. Flow features based classification have been previously proposed as promising method to identify Internet traffic based on packet statistical features. The selection of statistical features plays an important role for accurate and timely classification. In this work, we investigate the impact of packet inter-arrival time feature for online P2P classification in terms of accuracy, Kappa statistic and time. Simulations were conducted using available traces from University of Brescia, University of Aalborg and University of Cambridge. Experimental results show that the inclusion of inter-arrival time (IAT) as an online feature increases simulation time and decreases classification accuracy and Kappa statistic.
Volume: 8
Issue: 4
Page: 2521-2530
Publish at: 2018-08-01

A Comparative Review on Data Hiding Schemes

10.11591/ijeecs.v11.i2.pp768-774
Roshidi Din , Raihan Sabirah Sabri , Aida Mustapha , Sunariya Utama
Data hiding is a technique used to protect confidential information. The aim of a particular data hiding scheme is to make a more secure and robust method of information exchange so that confidential and private data can be protected against attacks and illegal access. The aim of this paper is to review on different data hiding schemes, covering the decoding, decrypting and extracting schemes. This paper also highlighted three major schemes that are widely used in research and real practice. The discussion include findings on the most recent work on decryption schemes.
Volume: 11
Issue: 2
Page: 768-774
Publish at: 2018-08-01
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