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31,377 Article Results

Voltage regulation and phase quantity increase of two high-power 12-phase rectifiers

10.11591/ijpeds.v10.i3.pp1454-1460
Valery Safonov , Mikhail Dziuba
In this article, we present a new method of simultaneously increasing the phase quantity and regulating the rectified voltage for two 12-phase high-power rectifiers operating at a common load. Self-excited voltage inverters separately form the necessary voltages for voltage regulation and for increasing the phase quantity. The formed voltage is input with the help of a common booster transformer. Separating the inverters functions and using the common booster transformer makes it possible to reduce the installed power of the equipment significantly compared to similar circuits when the regulation range of the rectified voltage is up to 5%. Calculations show that the inverter power for increasing the phase quantity is about 3% of the rectifier power. The circuit was modeled in MatLab/Simulink and the electromagnetic processes in the rectifier were studied. The proposed method makes it possible to reduce the total harmonic distortion of the network current and the pulsation coefficient of the rectified voltage to the values typical for 24-phase rectifiers.
Volume: 10
Issue: 3
Page: 1454-1460
Publish at: 2019-09-01

A novel single-phase PWM asymmetrical multilevel inverter with number of semiconductor switches reduction

10.11591/ijpeds.v10.i3.pp1133-1140
S. Kakar , S. M. Ayob , N. M. Nordin , M. S. Arif , A. Jusoh , N. D. Muhamad
In this paper, a new asymmetrical multilevel inverter topology (MLI) is proposed with the objectives of using decreased number of semiconductor switches, dc voltage sources, gate driver circuits and dc links. The structure of presented MLI is very simple and modular. The fundamental module of this structure consists of nine semiconductor switches (eight unidirectional and one bidirectional) and four asymmetrical configured DC sources (ratio of 1:2), which can generate 13-level output voltage. To validate the design, a Matlab-Simulink based model is developed. For this paper, a Sinusoidal Pulse Width Modulation (SPWM) is deployed as the switching strategy of the proposed MLI. The circuit model is simulated under pure resistive and inductive loads. It will be shown that the circuit performs well under both loads. Comparison with traditional MLIs and other recently introduced MLIs will be conducted to show the superiority of the proposed MLI in terms of reduced number of devices and lower voltage stress across the switches.
Volume: 10
Issue: 3
Page: 1133-1140
Publish at: 2019-09-01

Improved speed response of DC motor via intelligent techniques

10.11591/ijaas.v8.i3.pp204-207
Hassan Farahan Rashag
The classical Proportional- Integral (PI) control for Direct Current (DC) motor causes slow response of actual speed with high overshoot and undershoot which leads to sluggishness of the system. To minimize the problem of PI controller, intelligent technique based on hybrid neural network sliding mode control NN-SMC is suggested.  The benefits of SMC are that it is simple, and tough to parameter deviations as compared with other controllers. In this paper, the neural network NN is used to minimize the error between reference speed and actual speed. In addition, the SMC aim is to control and optimize the voltage that is supplies the DC motor which guarantees the robust performance of the speed controller under disturbances. The proposed method for the speed control is first calculated and executed to DC motor by using MATLAB SIMULINK. The results of the suggested NN-SMC are compared with the traditional PI controller. The results obviously show the supremacy of NN-SMC over PI controller.
Volume: 8
Issue: 3
Page: 204-207
Publish at: 2019-09-01

On approach for homogeneity increasing of films grown from the gas phase with account natural convection and changes in the rate of chemical interaction between materials

10.11591/ijaas.v8.i3.pp195-203
Evgeny L. Pankratov
We analyzed growth of films by gas phase epitaxy. Based on the analysis we formulate conditions to increase of homogeneity of properties of obtained films. We also present an analytical approach for analysis processes framework gas phase epitaxy with account natural convection and the possibility of changing the rate of chemical interaction between reagents.
Volume: 8
Issue: 3
Page: 195-203
Publish at: 2019-09-01

Comparisons of PI and ANN controllers for shunt HPF based on STF-PQ Algorithm under distorted grid voltage

10.11591/ijpeds.v10.i3.pp1339-1346
Mohamed Asghaiyer Omran , Izzeldin. I. Ibrahim , Abu Zaharin Ahmad , Mohamed Salem , Mohamad Milood Almelian , Awang Jusoh , Tole Sutikno
This paper proposes a shunt hybrid power filter (HPF) for harmonic currents and reactive power compensation under a distorted voltage and in a polluted environment. For this purpose, the reference current of the shunt HPF is computed based on the instantaneous reactive power (p-q) theory with self-tuning filter (STF). In order to adjust the dc voltage as a reference value, PI and ANN controllers have been utilized. Moreover, the system has been implemented and simulated in a MATLAB-SIMULINK platform, and selected results are presented. Therefore, the results verified the good dynamic performance, transient stability and strong robustness of the ANN controller. Furthermore, the shunt HAPF with ANN controller has been found to be in agreement with the IEEE 519-1992 standard recommendations on harmonic levels.
Volume: 10
Issue: 3
Page: 1339-1346
Publish at: 2019-09-01

Cache optimization cloud scheduling (COCS) algorithm based on last level caches

10.11591/ijaas.v8.i3.pp184-194
K. Vinod Kumar , Ranvijay Ranvijay
Recently, the utilization of cloud services like storage, various software, networking resources has extremely enhanced due to widespread demand of these cloud services all over the world. On the other hand, it requires huge amount of storage and resource management to accurately cope up with ever-increasing demand. The high demand of these cloud services can lead to high amount of energy consumption in these cloud centers. Therefore, to eliminate these drawbacks and improve energy consumption and storage enhancement in real time for cloud computing devices, we have presented Cache Optimization Cloud Scheduling (COCS) Algorithm Based on Last Level Caches to ensure high cache memory Optimization and to enhance the processing speed of I/O subsystem in a cloud computing environment which rely upon Dynamic Voltage and Frequency Scaling (DVFS). The proposed COCS technique helps to reduce last level cache failures and the latencies of average memory in cloud computing multi-processor devices. This proposed COCS technique provides an efficient mathematical modelling to minimize energy consumption. We have tested our experiment on Cybershake scientific dataset and the experimental results are compared with different conventional techniques in terms of time taken to accomplish task, power consumed in the VMs and average power required to handle tasks.
Volume: 8
Issue: 3
Page: 184-194
Publish at: 2019-09-01

Image and audio fractal compression: comprehensive review, enhancements and research directions

10.11591/ijeecs.v15.i3.pp1564-1570
Ahmed Huaasin Ali , Ali Nihad Abbas , Loay Edwar George , Mohd Rosmadi Mokhtar
This study aims to review the recent techniques in digital multimedia compression with respect to fractal coding techniques. It covers the proposed fractal coding methods in audio and image domain and the techniques that were used for accelerating the encoding time process which is considered the main challenge in fractal compression. This study also presents the trends of the researcher's interests in applying fractal coding in image domain in comparison to the audio domain. This review opens directions for further researches in the area of fractal coding in audio compression and removes the obstacles that face its implementation in order to compare fractal audio with the renowned audio compression techniques.
Volume: 15
Issue: 3
Page: 1564-1570
Publish at: 2019-09-01

Photovoltaic fed multilevel inverter using reverse voltage topology for standalone systems

10.11591/ijpeds.v10.i3.pp1347-1354
M. Arun Noyal Doss , K Mohanraj , Sayantan Bhattacharjee , Maulik Tiwari , Devashish Vashishtha
Multilevel Inverters are generally utilized for medium voltage and high power applications. Invented in 1975, MLIs have brought huge change in the field of Electrical and Electronics. It contains distinctive topologies. This paper proposes a photovoltaic aided multilevel inverter with Reverse Voltage topology with diminished number of switches. In comparison to other existing topologies this topology utilizes minimum number of switches and less number of carrier signals which in turns diminishes the complexity of the system as well as cost. The proposed framework contains five MOSFETs, five diodes to create eleven levels. In this topology the SPWM strategy has been utilized. This topology utilizes one sine wave and five triangular waves, which is half in comparison to the existing topologies. As sustainable power sources can be utilized for multilevel inverter, photovoltaic cell has been utilized. The MATLAB recreation for both solar powered module and Multilevel inverter has been appeared alongside the equipment approach.
Volume: 10
Issue: 3
Page: 1347-1354
Publish at: 2019-09-01

Odd generalized exponential log logistic distribution: A new acceptance sampling plans based on percentiles

10.11591/ijaas.v8.i3.pp176-183
Srinivasa Rao Gadde , K. Rosaiah , D. C. U. Sivakumar , K. Kalyani
In this paper, acceptance sampling plans are developed for the odd generalized exponential log logistic distribution based on percentiles when the life test is truncated at a pre-specified (pre-determined) time. The minimum sample size necessary to ensure the specified life percentile is obtained under a given consumer’s risk. The operating characteristic values of the sampling plans as well as the producer’s risk are presented. One example with real data set is also given as an illustration.
Volume: 8
Issue: 3
Page: 176-183
Publish at: 2019-09-01

A piecewise affine PI controller for buck converter generated DC motor

10.11591/ijpeds.v10.i3.pp1419-1426
Mohd Ikhmil Fadzrizan Mohd Hanif , Mohd Helmi Suid , Mohd Ashraf Ahmad
This paper presents a new Piecewise Affine Proportional-Integral (PA-PI) controller for angular velocity tracking of a buck converter generated dc motor. A Safe Experimentation Dynamics (SED) algorithm is employed as a data-driven optimization tool to find the optimal PA-PI controller parameters such that the integral square of error and input are reduced. The essential feature of the PA-PI controller is that the parameters of proportional and integral gains are adaptive to the error variations according to the Piecewise Affine (PA) function. Moreover, the proposed PA function is expected to provide better control accuracy than the other existing variable structure PID controller. In order to verify the effectiveness of the PA-PI controller, a widely known buck converter generated dc motor is considered. The performances of the proposed controller are observed in terms of the integral square of error and input, and the responses of the angular velocity and duty ration input. The simulation results verify that the proposed PA-PI controller yields higher control accuracy than the other existing controllers of buck converter generated dc motor.
Volume: 10
Issue: 3
Page: 1419-1426
Publish at: 2019-09-01

Active power loss reduction by opposition based kidney search algorithm

10.11591/ijaas.v8.i3.pp217-224
Kanagasabai Lenin
In this work Opposition based Kidney Search Algorithm (OKS) is used to solve the optimal reactive power problem. Kidney search algorithm imitates the various sequences of functions done by biological kidney. Opposition based learning (OBL) stratagem is engaged to commence the algorithm. This is to make certain high-quality of preliminary population and to expand the exploration steps in case of stagnation of the most excellent solutions. Opposition based learning (OBL) is one of the influential optimization tools to boost the convergence speed of different optimization techniques. The thriving implementation of the OBL engages evaluation of opposite population and existing population in the similar generation to discover the superior candidate solution of a given reactive power problem.  Proposed Opposition based Kidney Search Algorithm (OKS) has been tested in standard IEEE 14, 30, 57,118,300 bus test systems and simulation results show that the proposed algorithm reduced the real power loss efficiently.
Volume: 8
Issue: 3
Page: 217-224
Publish at: 2019-09-01

Non-intrusive electric power monitoring system in multi-purpose educational buildings

10.11591/ijpeds.v10.i3.pp1297-1307
Fernando del Ama Gonzalo , Jose A. Ferrandiz , David Fonseca Escudero , Juan A. Hernandez
Understanding the consumption patterns in a working space is important for evaluating the causes of energy wastage and for developing strategies towards specific energy reduction methods. The intent of metering systems in buildings is to provide adequate data that help improve building systems performance. The results of the analysis offer the potential to improve the energy efficiency of the building and reduce the operation costs. Researchers of Polytechnic University of Madrid and American University of Ras Al Khaimah have developed a metering and control system that processes and analyzes the digitalized signals. This system can collect, analyze and manage the electrical consumption in buildings. It is non-intrusive, can be easily deployed in electric boards and sends data to a central base station located away from the metering device. In this article the system is tested in an educational facility with a wide range of uses. The lighting fixtures, power outlets and HVAC devices are analyzed in offices, classrooms and architecture studios. This article concludes that energy audits for longer time periods help building managers understand device profiles, occupant behavior and environmental context.
Volume: 10
Issue: 3
Page: 1297-1307
Publish at: 2019-09-01

Learning probability of 4th grade science curriculum learning outcomes among visually impaired students

10.11591/ijere.v8i3.17591
Seraceddin Levent Zorluoğlu , Tuğçe Ergazi , Şeyma Eser
In this study, it is aimed to evaluating of learning probability of 4th grade science course curriculum learning outcomes by visually impaired students. Therefore, ability to gain learning outcomes has been examined. In addition to, in case of gaining of learning outcomes, “how to gain?” question was investigated. Document analysis method was used for this analysis. 46 learning outcomes were analyzed through descriptive analysis. As a result of analyzing, the confidence coefficients were found to be (.72) greater than .70. From these findings, low vision students could gain 80.4% and partially gain 19.6% of learning outcomes; blind students could gain 58.7% and partly gain 26.1% and not gain 15.2% of learning outcomes. It is thought that great majority of learning outcomes can be gained by visually impaired students. Visually impaired students can gain to curriculum learning outcomes, however it is necessary to use promoters for these students during teaching.
Volume: 8
Issue: 3
Page: 417-424
Publish at: 2019-09-01

Automatic segmentation of spinal cord diffusion MR Images for disease location finding

10.11591/ijeecs.v15.i3.pp1313-1321
Sk Hasane Ahammad , V. Rajesh , A. Neetha , Sai Jeesmitha. B , A. Srikanth
Dissemination weighted MR imaging may build the affectability and explicitness of MR imaging for certain pathologic states of the spinal rope yet is once in a while performed as a result of a few specialized issues. We consequently tried a novel stage explored turn reverberation dispersion weighted interleaved reverberation planar imaging arrangement in seven sound volunteers and six patients with intramedullary injuries. We performed dispersion weighted MR imaging of the spinal string with high spatial goals. Distinctive examples of dissemination irregularities saw in patient investigations bolster the conceivable symptomatic effect of dispersion weighted MR imaging for ailments of the spinal string. MR imaging has turned into the system of decision for imaging the spinal rope on account of a high affectability for pathologic intra medullary changes. In any case, the explicitness of anomalies oftentimes lingers behind when utilizing just regular MR arrangements. Dissemination weighted MR imaging guarantees to supply additional data in light of trademark changes of the clear dispersion coefficient, for example, those showed in intense ischemia, tumors, or sores related among numerous sclerosis. To date, the indicative commitment of dispersion weighted MR imaging has been concerted essentially in the cerebrum since dissemination weighted MR imaging of the spine is in detail every one the more requesting. Both the little size of the spinal rope and movement-initiated antiquities must be considered. We in this manner built up another examination strategy and tried its unwavering quality and potential for adding to the symptomatic workup of patients with spinal rope indications.
Volume: 15
Issue: 3
Page: 1313-1321
Publish at: 2019-09-01

Cross-cultural L2 learning exchange: A qualitative examination of strategies, tools, cognition and translation outcomes

10.11591/ijere.v8i3.20247
Robert W. Elliott , Xiaolei Chen
Amidst the milieu of free and at-cost L2 language software applications coming into existence for use on mobile devices and computers, adult L2 learners are faced with the challenge of selecting their best choice for them to use in acquiring a specific second language. Their selection is based on their individual need and the context in which they plan to use the second language. More importantly, it is well known there is no single tool, resource, or strategy that adult L2 learners can use to fully acquire a second language quickly and effectively, especially for intercultural couples who lack a common language for daily communication. While there is much literature on the topic of L2 acquisition and learning, the purpose of this auto-ethnographic study is to share with readers specific aspects of our journey in acquiring each other’s native language throughout their first year together. Included are subsequent findings involving cognition and translation issues as developing skills recognized during various phases of L2 acquisition.
Volume: 8
Issue: 3
Page: 519-530
Publish at: 2019-09-01
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