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27,544 Article Results

Harmonic Analysis of Three-phase Fixed Capacitor–thyristor Controlled Reactor under Balanced and Unbalanced Conditions

10.11591/ijra.v7i1.pp67-76
Jayababu Badugu , Y. P.Obulesu , Ch. Saibabu
Three-phase Fixed Capacitor Thyristor Controlled Reactor is widely used for reactive power compensation in power systems because of reduced cost and high reliability.  The problem with FC-TCR is that to generate current harmonics when it is partially conducting. When this harmonic current is interacted with system impedance, voltage waveform will distorted. This harmonic pollution is undesirable in power systems. Therefore, it is important to know the harmonic behaviour of three-phase FC-TCR before they can be used in a power system network. This paper presents the harmonic analysis of three-phase FC-TCR operating under balanced and unbalanced conditions. This analysis is useful to design the harmonic filter to reduce the harmonic pollution in power systems.The proposed work is implemented in MATLAB environment.
Volume: 7
Issue: 1
Page: 67-76
Publish at: 2018-03-01

An Actor-critic Algorithm Using Cross Evaluation of Value Functions

10.11591/ijra.v7i1.pp39-47
Hui Wang , Peng Zhang , Quan Liu
In order to overcome the difficulty of learning a global optimal policy caused by maximization bias in a continuous space, an actor-critic algorithm for cross evaluation of double value function is proposed. Two independent value functions make the critique closer to the real value function. And the actor is guided by a crossover function to choose its optimal actions. Cross evaluation of value functions avoids the policy jitter phenomenon behaved by greedy optimization methods in continuous spaces. The algorithm is more robust than CACLA learning algorithm, and the experimental results show that our algorithm is smoother and the stability of policy is improved obviously under the condition that the computation remains almost unchanged.
Volume: 7
Issue: 1
Page: 39-47
Publish at: 2018-03-01

Exploration Strategies of Coordinated Multi-Robot System: A Comparative Study

10.11591/ijra.v7i1.pp48-58
Ayman. El shenawy , Khalil. Mohamed , Hany. M. Harb
Environment Exploration is the basic process that most of Multi Robot Systems applications depend on it. The exploration process performance depends on the coordination strategy between the robots participating in the team.  In this paper the coordination of Multi Robot Systems in the exploration process is surveyed, and the performance of different Multi Robot Systems exploration strategies is contrasted and analyzed for different environments and different team sizes.
Volume: 7
Issue: 1
Page: 48-58
Publish at: 2018-03-01

Fuzzy Takagi-Sugeno Method in Microcontroller Based Water Tank System

10.11591/ijra.v7i1.pp1-7
Nur Maisarah Mohd Sobran , Munirah Mohd Salmi , Mohd Bazli Bahar , Md Nazri Othman , Siti Halma Johari
This paper present the performance of Fuzzy logic controller in maintain level of water in water tank system. The mathematical modelling was developed to get the initial idea of the system performance. Later, the prototype of water tank system were constructed and tested to get the real time results. The Takagi-Sugeno “on” and “off” interference technique method was implemented due to the control limitation of the pump motor that being used in the experimental setup. The fuzzy logic controller was realized by embedded the algorithm in microcontroller of the water tank system. The experimental results show acceptable level of water within the range of 18cm to 20.5cm and settling time 59 seconds with 20 cm set point.
Volume: 7
Issue: 1
Page: 1-7
Publish at: 2018-03-01

Maximum Wind Energy Extraction by Using Neural Network Estimation and Predictive Control of Boost Converter

10.11591/ijra.v7i1.pp59-66
Mahdi Heidari
This paper proposes a new method to extract maximum energy from wind turbine systems. The artificial neural network (ANN) is used to estimate the wind speed based on the rotor speed and the output power. In addition to ANN, a predictive controller is used to maximize the efficiency of the boost converter. The method has been developed and analyzed by utilizing a turbine directly driven permanent-magnet synchronous generator (PMSG). The simulation results verify the performance of the proposed method. Results show that this method maximizes wind energy extraction with more accuracy and fastness.
Volume: 7
Issue: 1
Page: 59-66
Publish at: 2018-03-01

Student Achievement in Turkey, According to Question Types Used in PISA 2003-2012 Mathematic Literacy Tests

10.11591/ijere.v7i1.11045
Yesim Ozer Ozkan , Nesrin Ozaslan
The aim of this study is to determine the level of achievement of students participating in Programme for International Student Assessment (PISA) 2003 and PISA 2012 tests in Turkey according to questions in the mathematical literacy test. This study is a descriptive survey. Within the scope of the study, the mathematical literacy test items were classified as multiple-choice, complex multiple-choice and constructed response items according to the different question types. The ratio of correct and partially correct and incorrect response given to each question type has been determined. Findings show that the achievements of students differ according to different types of questions. While the question type with the highest success average in the PISA 2003 test was multiple-choice, students got the highest scores from complex multiple-choice questions in the PISA 2012 test. The questionnaire with the lowest success average was found to be complex multiple-choice questions in the PISA 2003 test while students got the lowest scores from constructed response items in the PISA 2012 test. According to the constructivist education approach effectuated in 2005-2006 academic year, it is expected to observe a rise in constructed response question type; however, findings of the study reveal that the success of constructed response questions is decreased according to the application years.
Volume: 7
Issue: 1
Page: 57-64
Publish at: 2018-03-01

Investigation of Formation Control Approaches Considering the Ability of a Mobile Robot

10.11591/ijra.v7i1.pp18-38
Hannes Wind , Oliver Sawodny , Thomas Br•aunl
This work investigates and compares various formation control approaches for mobile robots. A comprehensive literature review was conducted, with particular focus on the approaches' applicability to be implemented on real mobile robots with limited hard and software capabilities. A realistic model of mobile robots is introduced and its parameters are identi ed with measurements from actual mo-bile robots. Later on, the model is extended and used within simulation studies of the various investigated approaches. A collision avoidance controller based on a formation controller is proposed and simulations are carried out. Experiments on real mobile robots are conducted for two formation controllers and for the pro-posed collision avoidance controller. It is shown that if the requirements resulting from the simulation studies are satis ed, an implementation on the real robots is possible.
Volume: 7
Issue: 1
Page: 18-38
Publish at: 2018-03-01

Power Harvesting Using Piezoelectric Shoe For External Power Storage

10.11591/ijeecs.v9.i3.pp655-659
Mohammad Saffri Mazalan , Roslina Mohamad , Murizah Kassim , Shahrani Shahbudin
The demands for portable energy source have increased because most portable electronic device needs the extra energy throughout the day due to the user’s increase in power consumption. Hence, a piezoelectric power harvesting shoe circuit with storage mechanism capabilities is designed by using piezoelectric disc material, 1N4007 bridge rectifiers, USB cables, and an external power storage. Piezoelectric disc material of 27mm and 35 mm in size that produces AC voltage when applied pressure is embedded in shoe’ insole and the output AC voltage is converted using a bridge rectifier for each material. The output is connected to a USB cable and can be connected to the external power storage during power harvesting. Different sizes of piezoelectric disc produce different amount of voltage and are also affected by the pressure applied to it. An amount of 5V is the requirements needed to charge an external device. The 27mm disc produces a voltage of 3V to 5V depending on the pressure applied while the 35mm disc produces 4V to 6.2V. Piezoelectric disc material is an alternative way to harvest energy when embedded to a shoe with an added storage capability as it solves the problem of needing the extra energy for electronic devices.
Volume: 9
Issue: 3
Page: 655-659
Publish at: 2018-03-01

Remote Sensing with Internet Based Patient Condition Observing System

10.11591/ijeecs.v9.i3.pp629-632
Pratibhahanmantrao Gaikwad , Dhiren Pranshankar Dave
This Paper aims to design and demonstrate an innovative web-based remote healthcare diagnostic system that provides vital medical data and live video images of a patient situated in the rural area accessible to a health professional available elsewhere in urban centres resulting in better diagnosis and treatment of that patient.
Volume: 9
Issue: 3
Page: 629-632
Publish at: 2018-03-01

Effect of Integrated Feedback on Classroom Climate of Secondary School Teachers

10.11591/ijere.v7i1.11146
Nilesh Kumar Patel
This study aimed at finding out the effect of Integrated feedback on Classroom climate of secondary school teachers. This research is experimental in nature. Non-equivalent control group design suggested by Stanley and Campbell (1963) was used for the experiment. Integrated feedback was treatment and independent variable, Classroom climate was dependent variable and pre- Classroom climate, and Intelligence were considered as covariates. The sample of the study comprised of 77 secondary school teachers and 220 students studying in secondary classes from purposively selected four schools of Indore city. The data for Classroom climate, Job satisfaction and Intelligence were collected through standardized tools. One-way ANCOVA and 2X2 factorial design ANCOVA were used for data analysis. Hypotheses were tasted at level of significance with α = 0.05. It was found that the treatment has significant effect over Classroom climate when pre- Classroom climate was taken as covariate. The results also shown that Classroom climate was independent of the treatment when Intelligence and pre- Classroom climate were separately considered as covariates. In addition, classroom climate was also found independent of interaction between feedback and intelligence when pre – Classroom climate was taken as covariate.
Volume: 7
Issue: 1
Page: 65-71
Publish at: 2018-03-01

Bandpass filter Based on Ring Resonator at RF Frequency above 20 GHz

10.11591/ijeecs.v9.i3.pp680-684
Norfishah Ab. Wahab , A. Amiruddin , Roskhatijah Radzuan , Zuhaila Mat Yasin , N. A. Salim , N. A. Rahmat , N. F. A. Aziz
This paper presents two dual-mode rectangular ring resonators, designed at RF frequency above 20 GHz for bandpass filter applications. The first resonator is designed at 20 GHz using single layer microstrip technology, on Rogers Duroid TMM10 substrate with the following characteristics; relative dielectric constant (εr) = 9.2, substrate thickness (h) = 1.270 mm, dielectric loss tangent (tan δ) = 0. The second resonator is built using multilayer CMOS technology at 75 GHz. The resonator is simulated using fluorinated silicon glass (FSG) and silicone rich oxide (SRO) with relative dielectric constant (εr) equals to 3.7 and 4.2 respectively. Both filter designs are built using full-wave electromagnetic simulation tool. For filter design using microstrip technology, the return lossis found at 9.999 dB and the insertion lossis at 3.108 dB while for filter design using CMOS technology, the return loss is found at 11.299 dB and the insertion lossat 0.335 dB. Both results had shown good passband performance with high rejection level at the out-of band.
Volume: 9
Issue: 3
Page: 680-684
Publish at: 2018-03-01

Query Processing for Time Efficient Data Retrieval

10.11591/ijeecs.v9.i3.pp784-788
Muhammad Qasim Memon , Jingsha He , Aasma Memon , Khurram Gulzar Rana , Muhammad Salman Pathan
In database management system (DBMS) retrieving data through structure query language is an essential aspect to find better execution plan for performance. In this paper, we incorporated database objects to optimize query execution time and its cost by vanishing poorly SQL statements. We proposed a method of evolving and inserting database constraints as database objects embedded with queries either to add them for the sake of transactions required by user to detect those queries for the betterment of performance. We took analysis on several databases while processing queries itself and assimilate real time database workload with the bunch of transactions are invoked in comparison with tuning approaches. These database objects are coded in procedural language environment pertaining rules to make it worth and are merged into queries offering improved execution plan.
Volume: 9
Issue: 3
Page: 784-788
Publish at: 2018-03-01

SLIC Superpixel Based Self Organizing Maps Algorithm for Segmentation of Microarray Images

10.11591/ijaas.v7.i1.pp78-85
Durga Prasad Kondisetty , Mohammed Ali Hussain
We can find the simultaneous monitoring of thousands of genes in parallel Microarray technology. As per these measurements, microarray technology have proven powerful in gene expression profiling for discovering new types of diseases and for predicting the type of a disease. Gridding, Intensity extraction, Enhancement and Segmentation are important steps in microarray image analysis. This paper gives simple linear iterative clustering (SLIC) based self organizing maps (SOM) algorithm for segmentation of microarray image. The clusters of pixels which share similar features are called Superpixels, thus they can be used as mid-level units to decrease the computational cost in many vision applications. The proposed algorithm utilizes superpixels as clustering objects instead of pixels. The qualitative and quantitative analysis shows that the proposed method produces better segmentation quality than k-means, fuzzy c-means and self organizing maps clustering methods.
Volume: 7
Issue: 1
Page: 78-85
Publish at: 2018-03-01

Experimental and Modeling Dynamic Study of the Indirect Solar Water Heater: Application to Rabat Morocco

10.11591/ijaas.v7.i1.pp86-96
Ouhammou Badr , Azeddine Frimane , Aggour Mohammed , Brahim Daouchi , Abdellah Bah , Halima Kazdaba
The Indirect Solar Water Heater System (SWHS) with Forced Circulation is modeled by proposing a theoretical dynamic multi-node model. The SWHS, which works with a 1,91 m2 PFC and 300 L storage tank, and it is equipped with available forced circulation scale system fitted with an automated sub-system that controlled hot water, is what the experimental setup consisted of. The system, which 100% heated water by only using solar energy. The experimental weather conditions are measured every one minute. The experiments validation steps were performed for two periods, the first one concern the cloudy days in December, the second for the sunny days in May; the average deviations between the predicted and the experimental values is 2 %, 5 % for the water temperature output and for the useful energy  are 4 %, 9 % respectively for the both typical days, which is very satisfied. The thermal efficiency was determined experimentally and theoretically and shown to agree well with the EN12975 standard for the flow rate between 0,02 kg/s and 0,2kg/s.
Volume: 7
Issue: 1
Page: 86-96
Publish at: 2018-03-01

Tracing Mathematical Function of Age Specific Fertility Rate in Peninsular Malaysia

10.11591/ijeecs.v9.i3.pp637-642
Norsyela Muhammad Noor Mathivanan , Puzziawati Ab Ghani , Nor Azura Md.Ghani
The size, structure, and composition of a population are affected by the fertility rates at any point of time. Many researchers took the opportunity to exploit the fertility rates in obtaining better fertility patterns for their country. The curve for the age specific fertility rate is consistent, and this feature allows the curve to be matched with a mathematical model. This paper aimed to identify the best mathematical model that fits the recent age specific fertility rate in Peninsular Malaysia. This study fitted the fertility data of Peninsular Malaysia from 1996 to 2014 to the four mathematical models, which were Hadwiger, Gamma, Beta, and Gompertz models. From the comparisons of the four models, it was found that the best fitted mathematical model is Hadwiger model. In relation to the data of early 21st century, there was an inclination for the best fitted mathematical model from Hadwiger model to Beta model. Hence, the best mathematical model for each year can be used to convert a fertility schedule classified in a five-year age group into a fertility schedule for a single-year of age in Peninsular Malaysia. This model also can be helpful for population projections by using limited and defective data. 
Volume: 9
Issue: 3
Page: 637-642
Publish at: 2018-03-01
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