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29,905 Article Results

Robust features extraction for general fish classification

10.11591/ijece.v9i6.pp5192-5204
Mutasem K. Alsmadi , Mohammed Tayfour , Raed A. Alkhasawneh , Usama Badawi , Ibrahim Almarashdeh , Firas Haddad
Image recognition process could be plagued by many problems including noise, overlap, distortion, errors in the outcomes of segmentation, and impediment of objects within the image. Based on feature selection and combination theory between major extracted features, this study attempts to establish a system that could recognize fish object within the image utilizing texture, anchor points, and statistical measurements. Then, a generic fish classification is executed with the application of an innovative classification evaluation through a meta-heuristic algorithm known as Memetic Algorithm (Genetic Algorithm with Simulated Annealing) with back-propagation algorithm (MA-B Classifier). Here, images of dangerous and non-dangerous fish are recognized. Images of dangerous fish are further recognized as Predatory or Poison fish family, whereas families of non-dangerous fish are classified into garden and food family.  A total of 24 fish families were used in testing the proposed prototype, whereby each family encompasses different number of species. The process of classification was successfully undertaken by the proposed prototype, whereby 400 distinct fish images were used in the experimental tests. Of these fish images, 250 were used for training phase while 150 were used for testing phase. The back-propagation algorithm and the proposed MA-B Classifier produced a general accuracy recognition rate of 82.25 and 90% respectively.
Volume: 9
Issue: 6
Page: 5192-5204
Publish at: 2019-12-01

Robust adaptive controller design for excavator arm

10.11591/ijra.v8i4.pp293-300
Nga Thi-Thuy Vu
This paper presents a robust adaptive controller that does not depend on the system parameters for an excavator arm. Firstly, the model of the excavator arm is demonstrated in the Euler-Lagrange form considering with overall excavator system. Next, a robust adaptive controller has been constructed from information of state error. In this paper, the stability of overall system is mathematically proven by using Lyapunov stability theory. Also, the proposed controller is model free then the closed loop system is not affected by disturbances and uncertainties. Finally, the simulation is executed in Matlab/Simulink for both presented scheme and the PD controller under some conditions to ensure that the proposed algorithm given the good performances for all cases.
Volume: 8
Issue: 4
Page: 293-300
Publish at: 2019-12-01

Retinex theory for color image enhancement: A systematic review

10.11591/ijece.v9i6.pp5560-5569
Ruaa Riyadh Hussein , Yaser Issam Hamodi , Rooa Adnan Sabri
A short but comprehensive review of Retinex has been presented in this paper. Retinex theory aims to explain human color perception. In addition, its derivation on modifying the reflectance components has introduced effective approaches for images contrast enhancement. In this review, the classical theory of Retinex has been covered. Moreover, advance and improved techniques of Retinex, proposed in the literature, have been addressed. Strength and weakness aspects of each technique are discussed and compared. An optimum parameter is needed to be determined to define the image degradation level. Such parameter determination would help in quantifying the amount of adjustment in the Retinex theory. Thus, a robust framework to modify the reflectance component of the Retinex theory can be developed to enhance the overall quality of color images.
Volume: 9
Issue: 6
Page: 5560-5569
Publish at: 2019-12-01

Design and testing of stability improvement of nine multi-level H-Inverter for distribution system

10.11591/ijra.v8i4.pp245-255
R. Arulmurugan
In this article, a solitary phase nine-level series connected H-Bridge powered by photovoltaic MPPT based SHAPF in view of basic controller is proposed. SRF is utilized for reference input current extraction and to create pulses for the SHAPF. The principle point of the cascaded bridge is to dispense harmonics, enhance power factor and reactive energy compensation of the single-phase distribution framework. The suggested control calculation has two parts, changing the load current into stationary reference outline directions and estimation of peak amplitude of load currents. Consequently, a basic and dependable controller effortlessly of execution was created. The calculation for single-phase SHAF is intending to perform with exact tracking performance under step changes in load currents and to give great dynamic compensation. In this article, synchronous reference theory PLL with Inverse-Park change is adopted for producing quadrature part of current. The execution of the control calculation is tried and assessed utilizing MATLAB/Simulink tool.
Volume: 8
Issue: 4
Page: 245-255
Publish at: 2019-12-01

Solutions of reaction-diffusion equations using similarity reduction and HSSOR iteration

10.11591/ijeecs.v16.i3.pp1430-1438
Nur Afza Mat Ali , Rostang Rahman , Jumat Sulaiman , Khadizah Ghazali
Similarity method is used in finding the solutions of partial differential equation (PDE) in reduction to the corresponding ordinary differential equation (ODE) which are not easily integrable in terms of elementary or tabulated functions. Then, the Half-Sweep Successive Over-Relaxation (HSSOR) iterative method is applied in solving the sparse linear system which is generated from the discretization process of the corresponding second order ODEs with Dirichlet boundary conditions. Basically, this ODEs has been constructed from one-dimensional reaction-diffusion equations by using wave variable transformation. Having a large-scale and sparse linear system, we conduct the performances analysis of three iterative methods such as Full-sweep Gauss-Seidel (FSGS), Full-sweep Successive Over-Relaxation (FSSOR) and HSSOR iterative methods to examine the effectiveness of their computational cost. Therefore, four examples of these problems were tested to observe the performance of the proposed iterative methods.  Throughout implementation of numerical experiments, three parameters have been considered which are number of iterations, execution time and maximum absolute error. According to the numerical results, the HSSOR method is the most efficient iterative method in solving the proposed problem with the least number of iterations and execution time followed by FSSOR and FSGS iterative methods.
Volume: 16
Issue: 3
Page: 1430-1438
Publish at: 2019-12-01

Control shunt active filter based on dq frame using current model prediction

10.11591/ijra.v8i4.pp301-312
Chi Nguyen Van , Hoang Dang Danh
The nonlinear loads present more in the power systems in the practice today by developing of electronic technology and using the small distributed power sources (solar power, wind power etc.), this causes the increasing the high frequency switch devices etc. in the power network. Nonlinear loads cause non-sinusoidal currents and voltages with harmonic components, increasing the reactive power, overload of power lines and electrical devices, low power factor and affecting badly to the networks. Shunt active filters (SAF) with current controlled voltage source inverters (CCVSI) are used effectively to reduce the harmonics and to balance the phases sinusoidal source currents by generating the currents to compensate the harmonic currents caused by the nonlinear loads. In this paper we suppose a control strategy to generate the compensation currents of SAF by using the current model predictive engineering. This method is better than the control strategy using PI controller in term of transient time. The desired compensation currents can track exactly the reference compensation currents on the dq frame. The simulation results implemented on the nonlinear load, a full bridge rectifier and 3 phase unbalance load, show that the transient period decrease from 0.1s to 0.02s in comparing with PI controller. The experimental results proof that the THD of source currents decrease from 24.8% to 5.4% when using the proposed method.
Volume: 8
Issue: 4
Page: 301-312
Publish at: 2019-12-01

Optimization of PID controller parameters using PSO for two area load frequency control

10.11591/ijra.v8i4.pp256-268
Brijesh Kumar Dubey , N. K. Singh , Sameer Bhambri
In this paper, an evolutionary computing approach for determining the optimal values for the proportional-integral-derivative (PID) controller parameters of load frequency control (LFC) of two area power system is presented. The proposed approach employs a particle swarm optimization technique to find optimum parameters. The state space model of two area power system and an Eigen value based objective function is considered. The effectiveness of the proposed approach is compared with integral control. Simulation results justify the proposed approach in terms of damping the oscillations, improved settling time, less over/under shoots.
Volume: 8
Issue: 4
Page: 256-268
Publish at: 2019-12-01

Scientific literacy and science learning achievement at junior high school

10.11591/ijere.v8i4.20312
Jufrida Jufrida , Fibrika Rahmat Basuki , Wawan Kurniawan , Miko Danu Pangestu , Olva Fitaloka
Scientific literacy is the ability which must be owned by the students to analyze and apply the concept of science in solving daily life problem. This research aims to know the correlation between scientific literacy and science learning achievement at State Junior High Schools. This research used a quantitative approach with correlational type. The population of this research were 428 grade IX students at State Junior High Schools within the District of Jaluko Muaro Jambi. The samples was 138 students. The technique of selecting samples was random sampling. The instruments used were the test of science literacy and the test of science learning achievement. Hypothesis test was conducted by using rank spearman correlation test with the assistance of SPSS 21. The results show the average score of scientific literacy is 33.7 (medium category) and the average score of science learning achievement is 21.5 (very low category). The result of the correlation test obtains Sig value 0.00 then Ho is rejected. It can be concluded that there is a significant correlation between scientific literacy and science learning achievement at State Junior High School within Muaro Jambi District. Science learning is expected to develop students’ science literacy so that it can improve science learning achievement.
Volume: 8
Issue: 4
Page: 630-636
Publish at: 2019-12-01

Instructional leadership beliefs among Filipino pre-service teachers

10.11591/ijere.v8i4.20275
Rudolf T Vecaldo
In the teacher education context, there has been a call to pay attention to the preparation of pre-service teachers for instructional leadership roles necessary in today’s various school reforms. Nonetheless, because the integration of instructional leadership is relatively new in the Philippine teacher education curriculum, there is a dearth of research along with this aspect. With the increasing need for more research on instructional leadership, particularly on Teacher Education Institutions (TEIs), this exploratory study was undertaken. Using an in-depth interview, it examined the instructional leadership beliefs of Filipino pre-service teachers. Twelve (12) graduating pre-service teachers from a public university in Cagayan Province, Philippines became the study participants whose views, insights, and narratives were thematically analyzed. Interestingly, the results of the study revealed that pre-service teachers believe that instructional leadership is shared, learning-focused, a conversation, service-driven, and a pursuit of equity. These deepen the assertion that understanding the instructional leadership beliefs of pre-service teachers would promote instructional interventions that can empower them and advocate a viable instructional leadership framework not only in the Philippine context but in the ASEAN region as well.
Volume: 8
Issue: 4
Page: 596-603
Publish at: 2019-12-01

Developed artificial neural network based human face recognition

10.11591/ijeecs.v16.i3.pp1279-1285
Maryam Mahmood Hussein , Ammar Hussein Mutlag , Hussain Shareef
Face recognition has become one of the most important challenging problems in personal computer-human interaction, video observation, and biometric. Many algorithms have been developed in the recent years. Theses algorithms are not sufficiently robust to address the complex images. Therefore, this paper proposes soft computing algorithm based face recognition. One of the most promising soft computing algorithms which is back-propagation artificial neural network (BP-ANN) has been proposed. The proposed BP-ANN has been developed to improve the performance of the face recognition. The implementation of the developed BP-ANN has been achieved using MATLAB environment. The developed BP-ANN requires supervised training to learn how to anticipate results from the desired data. The BP-ANN has been developed to recognition 10 persons. Ten images have been used for each person. Therefore, 100 images have been utilized to train the developed BP-ANN. In this research 50 images have been used for testing purpose. The results show that the developed BP-ANN has produced a success ratio of 82%.
Volume: 16
Issue: 3
Page: 1279-1285
Publish at: 2019-12-01

Performance degradation assessment and VM placement policy in cloud

10.11591/ijece.v9i6.pp4961-4969
Susmita J. A. Nair , T. R. Gopalakrishnan Nair
In virtualized servers, with live migration technique pages are copied from one physical machine to another while the virtual machine (VM) is running. The dynamic migration of virtual machines encumbers the data center which in turn reduces the performance of applications running on that particular physical machine. A considerable number of studies have been carried out in the area of performance evaluation during live VM migration.  However, all the aspects related to the migration process have not been examined for the performance assessment. In this paper, we propose a novel approach to evaluate the performance during migration process in different types of coupled machine environment. It is presented here that the state of art VM migration technology requires further improvement in realizing effective migration by monitoring comprehensive performance value. We introduced the parameter, θ, to compare performance value which can be used for controlling and halting unsuccessful migration and save significant amount of time in migration operation.  Our model is capable of analyzing real time scenario of cloud performance assessment targeting VM migration strategies. It also offers the possibility of further expanding to universal models for analyzing the performance variations that occurs as a result of VM migration.
Volume: 9
Issue: 6
Page: 4961-4969
Publish at: 2019-12-01

Research methods of V/F control for matrix converter use direct space vector modulation

10.11591/ijece.v9i6.pp5115-5124
Bogdan Vasilev , Le Van Tung
Matrix converter (MC) is direct AC to AC converter built on bidirectional switches with more outstanding advantages compared to the indirect AC - DC-AC converter such as power exchange in two directions, allowing regenerative braking performance amount returned grid. However, the modulation method for Matrix converter has the disadvantage of low voltage transmission ratio, current at the input and output current, the voltage of converter has many high-order harmonic components. The paper presents the technique of directly modulating the space vector which will improve the quality of matrix converter such as input and output currents with sine form, power factor input is nearly 1 and can be adjusted. Also, build V/F control method for matrix converter to control three-phase alternating current induction motors. Research results are tested by Matlab & Simulink software.
Volume: 9
Issue: 6
Page: 5115-5124
Publish at: 2019-12-01

A Fast-Efficient parallel processing algorithm for straight line detection

10.11591/ijeecs.v16.i3.pp1320-1326
Rasiq S. M. , Jeevan K. M. , S. Krishnakumar
This work presents a novel method for detecting straight lines in an image at a very high speed with optimum number of processors and their functionalities. The method can be used to extract straight lines directly from an image without noise removal and pre-processing. First the square image is converted to a binary edge image using a parallel edge detection mechanism. The parallel edge detection mechanism used in this work is capable of producing edge image within a short time. Then the binary square image is transferred to a system having large number of Processing Elements (PEs). A PE has only limited jobs such as pixel scanning, compare line length with nearby PEs and transmit data to the Main Control Unit (MCU). The MCU collects data from all PEs and evaluates straight lines. Even if the number of PEs is high, it is comparatively very much less than the parallel Hough Transform method and practically implementable using recent ULSI technologies.
Volume: 16
Issue: 3
Page: 1320-1326
Publish at: 2019-12-01

Model of absorbed gamma radiation in the interaction with rock formation

10.11591/ijra.v8i4.pp269-276
A. A. Azaryan , A. N. Gritsenko , A. A. Trachuk , V. M. Serebrenikov , D. V. Shvets
The article discusses issues of improving the accuracy of operational quality control of iron ore in mountain ranges. There was proposed the use of the absorbed gamma radiation indicator as an improvement of the nuclear physics method for determining the iron content in ore mass are proposed. There were obtained the relationships of the sensitivity of the absorbed gamma radiation intensity on the distance between the detector and the irradiated surface, as well as on the distance between the source and the detector of gamma radiation.
Volume: 8
Issue: 4
Page: 269-276
Publish at: 2019-12-01

The role of social media in reshaping the academic activities of vocational and technical education lecturers in Nigeria

10.11591/ijere.v8i4.20305
Adamu Muhammaed Jebba
The use of social media is one of the predominant features in the average daily life of students and lecturers across tertiary institutions in Nigeria. It was against this backdrop that this study was carried out to determine the role of social media in reshaping the future of academic activities among lecturers of Vocational and Technical education in Nigeria. The study adopted descriptive survey research design. A structured questionnaire consisting of 40- items was developed by the researcher for data collection. The reliability of the instrument was determined using Kuder Richardson (KR20) formula which yielded 0.85. The population of the study comprised lecturers from the two Colleges of Education in Niger State.  Four research questions guided the study. The findings revealed among others that social media is a technological tool that can reshape the future of teaching Vocational and Technical education as it brings with it new opportunities which is capable of promoting collaborative teaching and learning as well as the potential to promote and reshape the future of higher education in institutions of learning. Furthermore, the trend according to the findings of this study revealed that the overwhelming patronage is in terms of making new friends (online), playing games, exchange of affectionate/love messages, online chatting, sharing selfies, spreading false information, hate speeches, and even quarrelling with virtual friends. On the basis of these findings, some recommendations were made which among others include the need for the college management to mount capacity building programmes to retrain the lecturers to understand the concept of social learning and to keep them abreast with innovative teaching and learning platform such as social media.
Volume: 8
Issue: 4
Page: 735-741
Publish at: 2019-12-01
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