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31,291 Article Results

Level Shifted Discontinuous PWM Algorithms to Minimize Common Mode Voltage for Cascaded Multilevel Inverter Fed Induction Motor Drive

10.11591/ijpeds.v9.i2.pp504-518
M. Nayeemuddin , T. Bramhananda Reddy , M. Vijaya Kumar
This paper presents combinations of level shifted pulse-width modulation algorithm with conventional discontinuous pulse-width modulation methods for cascaded multilevel inverters. In the proposed DPWM a zero sequence signal is injected in sinusoidal reference signal to generate various modulators with easier implementation. The analysis four various control strategies namely Common Carrier (CC), Inverted Carrier (IC), Phase Shifted (PS) and Inverted Phase Shift (IPS) for cascaded multilevel inverter fed induction motor drive has been illustrated. To validate the proposed work experimental tests has been carried out using dSPACE controller. Experimental study proves that using proposed algorithms reduction in common-mode voltage with fewer harmonics along with reduced switching loss for a cascaded multilevel inverter fed motor drive has been achieved.
Volume: 9
Issue: 2
Page: 504-518
Publish at: 2018-06-01

Design and Analysis of an Improved Nucleotide Sequences Compression Algorithm Using Look up Table (LUT)

10.11591/ijaas.v7.i2.pp152-155
Govind Prasad Arya , R.K. Bharti , Devendra Prasad
DNA (deoxyribonucleic acid), is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). With continuous technology development and growth of sequencing data, large amount of biological data is generated. This large amount of generated data causes difficulty to store, analyse and process DNA sequences. So there is a wide need of reducing the size, for this reason, DNA Compression is employed to reduce the size of DNA sequence. Therefore there is a huge need of compressing the DNA sequence. In this paper, we have proposed an efficient and fast DNA sequence compression algorithm based on differential direct coding and variable look up table (LUT).
Volume: 7
Issue: 2
Page: 152-155
Publish at: 2018-06-01

Super Capacitor Electronic Circuit Design for Wireless Charging

10.11591/ijaas.v7.i2.pp191-198
A. Hameed , Lway Faisal Abdulrazak , Zaid A. Aljawary
Keeping time as base, a gadget has been proposed, where electrical accessories like Mobiles are charged within a fraction of minutes which is highly efficient and time saver as compared to the present time chargers which take nearly two hours to get fully charged. Objective of this project is to create a circuit which will be charged quickly and wireless. Wireless charging circuit works on the principle of inductive coupling. AC energy has been converted to DC energy through diode rectifier. Oscillator circuit produces high frequency passed by transmitter circuit to transmit magnetic field which is received by receiver circuit. A wireless charging concept with super capacitor will lead to faster charging and long operative life. Here super capacitor is used as a storage device. A Super capacitor has magnificent property, it can charge as well as discharge very quickly and linearly alike battery. The main difference between battery and super capacitor is specific energy, Super capacitor have 10-50 time less than battery.
Volume: 7
Issue: 2
Page: 191-198
Publish at: 2018-06-01

Building Fault Tolerance Within Wsn- A Topology Model

10.11591/ijaas.v7.i2.pp135-142
M. Sai Rama Krishna , Ch. Jnana Gayathri , K. Laxmi Pallavi Rao
Wireless Sensor network plays a crucial role which helps in visualizing, processing, and analyzing the information wirelessly.  WSN is a network which consists of huge amount of sensor devices which are of low cost and low powered also known as sensor nodes. These type of networks are generally used in real time applications such as monitoring of environmental conditions, militaries, industries etc.,.but the problem that exists in WSN is may be due to different failures such as node failure, link failure, sink failure, interference, power dissipation and collision. If these faults are unable to handle then the desired network criteria’s may not be reached properly which results in inefficiency of the network. So, the main idea behind the investigation is to form a different networking topology which works in the event of failure
Volume: 7
Issue: 2
Page: 135-142
Publish at: 2018-06-01

Experimental Verification of Single Phase Z Source Inverter for Photovoltaic Applications

10.11591/ijpeds.v9.i2.pp698-703
Saravanan Vasudevan , M. Aravindan , V. Balaji , M. Arumugam
A single phase Z source inverter is developed for better voltage boosting and inversion ability suited for photovoltaic power generation systems. The operation of the Z source inverter is described with relevant equations. Simple boost scheme is used for switching actions of the inverter. The performance of the inverter used for photovoltaic applications can be checked with simulation and experimental results, which prove that it has single-stage buck and boost capability and improved reliability.
Volume: 9
Issue: 2
Page: 698-703
Publish at: 2018-06-01

Physical Properties and Compressive Strength of Zinc Oxide Nanopowder as a Potential Dental Amalgam Material

10.11591/ijaas.v7.i2.pp97-101
Nanang Qosim , Putut Murdanto , Poppy Puspitasari
In this study, the application of nanotechnology was applied in the dentistry field, especially in the innovation of dental amalgam material. To date, mercury (Hg) has been used widely as dental amalgam material with consideration of the cheap price, ease of use, and good mechanical strength. However, last few years, many problems have been faced in the dentistry field due to the use of mercury. Hence, new material is needed as an innovation to eliminate the mercury from dental amalgam composition. This research was conducted to analyze the physical properties and compressive strength of zinc oxide (ZnO) nanopowder as a potential dental amalgam material. The physical properties such as morphology and dimensions were analyzed by SEM and XRD. Further, the compression test was conducted by using hydraulic press machine. The results showed that the ZnO nanopowder analyzed has the particle size of 14.34 nm with the morphology classified as nanorods type. On the compression load of 500 kg, the average of ZnO green density is 3.170 g/cm3. This value experienced the increase of 4.763% when the load was set to 1000 kg, and 7.539% at 2000 kg. The dwelling time also took the same effect. At 30 seconds, the average of ZnO green density is 3.260 g/cm3. This value experienced the increase of 0.583% at 60 seconds and 3.098% at 90 seconds.
Volume: 7
Issue: 2
Page: 97-101
Publish at: 2018-06-01

Vision Based Approach to Sign Language Recognition

10.11591/ijaas.v7.i2.pp156-161
Himanshu Gupta , Aniruddh Ramjiwal , Jasmin T. Jose
We propose an algorithm for automatically recognizing some certain amount of gestures from hand movements to help deaf and dumb and hard hearing people. Hand gesture recognition is quite a challenging problem in its form. We have considered a fixed set of manual commands and a specific environment, and develop a effective, procedure for gesture recognition. Our approach contains steps for segmenting the hand region, locating the fingers, and finally classifying the gesture which in general terms means detecting, tracking and recognising. The algorithm is non-changing to rotations, translations and scale of the hand. We will be demonstrating the effectiveness of the technique on real imagery.
Volume: 7
Issue: 2
Page: 156-161
Publish at: 2018-06-01

Grid Connected Inverter for Current Control by Using Anti-Islanding Technique

10.11591/ijpeds.v9.i2.pp926-932
B V Rajanna , K S Srikanth
The inverter with critical loads should be able to provide critical loads with a stable and seamless voltage during control mode change as well as clearing time. The indirect current control has been proposed for providing stable voltage with critical load during clearing time and seamless control mode transfer of inverters. However, the islanding detection is difficult since with the indirect current control the magnitude and frequency of voltage do not change when the islanding occurs. The conventional anti-islanding method based on the magnitude and frequency of voltage variation cannot apply to the indirect current control. This paper proposes an islanding detection method for the indirect current control. The proposed islanding detection method can detect the islanding using reactive power perturbation and observation when the frequency and magnitude of voltage don’t vary during clearing time. In order to verify the proposed anti-islanding method, the experimental results of a 600W three-phase inverter are provided.
Volume: 9
Issue: 2
Page: 926-932
Publish at: 2018-06-01

Comparison of Different Control Techniques for Interleaved DC-DC Converter

10.11591/ijpeds.v9.i2.pp641-647
M. Kavitha , V. Sivachidambaranathan
Interleaved DC-DC converter with coupled inductor is used in standalone Photovoltaic, battery charger/discharger application. The main issue of the Interleaved DC-DC converter is that, it does not provide constant output voltage for a change in input voltage. Therefore, the converter efficiency is reduced. Hence to overcome this drawback, proper controller has to be used. In this paper, different control techniques such as PI, PID and Fuzzy logic controller are used. The simulation results of all three controllers were done using MATLAB/Simulink and compared. Fuzzy logic controller provides better regulated output voltage with less settling time of 0.04sec.
Volume: 9
Issue: 2
Page: 641-647
Publish at: 2018-06-01

The Combination of Steganography and Cryptography for Medical Image Applications

10.11591/ijaas.v7.i2.pp102-104
B. Kiran Bala , R. Sasi Kumar
To give more security for the biomedical images for the patient betterment as well privacy for the patient highly confidently patient image report can be placed in database. If unknown persons like hospital staffs, relatives and third parties like intruder trying to see the report it has in the form of hidden state in another image. The patient detail like MRI image has been converted into any form of steganography. Then, encrypt those image by using proposed cryptography algorithm and place in the database.
Volume: 7
Issue: 2
Page: 102-104
Publish at: 2018-06-01

Mitigation of Selfish Node Attacks in Autoconfiguration of MANETs

10.11591/ijaas.v7.i2.pp162-168
Reshmi. T.R , Shymala L , Sandhya. M.K
Mobile ad-hoc networks (MANETs) are composed of mobile nodes connected by wireless links without using any pre-existent infrastructure. Hence the assigning of unique IP address to the incoming node becomes difficult. There are various dynamic auto configuration protocols available to assign IP address to the incoming nodes including grid based protocol which assigns IP address with less delay and low protocol overhead. Such protocols get affected by presence of either selfish nodes or malicious nodes. Moreover there is no centralized approach to defend against these threats like in wired network such as firewall, intrusion detection system, proxy etc. The selfish nodes are the nodes which receive packet destined to it and drop packet destined to other nodes in order to save its energy and resources. This behavior of nodes affects normal functioning of auto configuration protocol. Many algorithms are available to isolate selfish nodes but they do not deal with presence of false alarm and protocol overhead. And also there are certain algorithms which use complex formulae and tedious mathematical calculations. The proposed algorithm in this paper helps to overcome the attack of selfish nodes effect in an efficient and scalable address auto configuration protocol that automatically configures a network by assigning unique IP addresses to all nodes with a very low protocol overhead, minimal address acquisition delay and computational overhead.
Volume: 7
Issue: 2
Page: 162-168
Publish at: 2018-06-01

The Role of Journal Writing in Senior High School Students’ Attitude toward Mathematics

10.11591/ijere.v7i2.13054
Ivee Kalalo Guce
The study investigated the influence of journal writing on the senior high school students’ attitude toward mathematics. A mixed-method approach, particularly the convergent parallel design, was used in this study. Using Scale on Attitude Toward Mathematics (SATM) (Guce & Talens, 2013), the students’ attitude toward the subject was measured in four subscales—liking or disliking mathematics, tendency to engage in or avoid mathematical activities, belief that one is good or bad in mathematics and belief that mathematics is useful or useless. Using focus group discussion, the insights of the students on journal writing as a mathematics class activity were gathered. Results using quantitative data revealed positive significant differences in the attitude of the respondents in terms of (i) liking mathematics and (ii) having the tendency to engage in mathematical activities. This aligned with the result in the focus group discussion which suggested that students perceive journal writing as a helpful tool for them to enjoy mathematics and engage in it. The activity, thus, may be regarded as a means to improve students’ attitude toward mathematics.
Volume: 7
Issue: 2
Page: 132–141
Publish at: 2018-06-01

Modular Approach to Implement Model Predictive Control on Three Phase Voltage Source Inverter

10.11591/ijpeds.v9.i2.pp897-904
Muhammad Abbas Abbasi , Abdul Rashid Bin Husain , Hasan Alqaraghuli
A modular abstraction is presented to implement model predictive control (MPC) on a three phase two level voltage source inverter to control its output current. Traditional ways of coded implementation do not provide insights into the complex nature of MPC; hence a more intuitive, logical and flexible approach for hardware implementation is conceptualized in the form of signal flow graphs (SFGs) for estimation, prediction and optimization. Simulation results show good performance of the approach and easier code generation for real time implementation. RL load is assumed for the inverter and the importance of choosing load inductance and sampling time ratio is emphasized for better control performance.
Volume: 9
Issue: 2
Page: 897-904
Publish at: 2018-06-01

Smart Monitoring System of DC to DC Converter for Photovoltaic Application

10.11591/ijpeds.v9.i2.pp722-729
Jameel Kadhim Abed
This paper presents a new smart monitoring system designed based on dc to dc converter for photovoltaic application. This system design according two parts to monitor input-output voltages and currents for dc/dc converter, (a) control system: the control system using Arduino NANO as microcontroller to read the measuring voltage and current values from sensor circuits of voltage and current. The measuring data send by Bluetooth HC-05 to end user (monitor system). Bluetooth as wireless communication between the control system and monitoring system (end users). (b) monitoring system: The monitoring system application program as a new application designed to monitor the received data from control system from safety distance (around 10m). the application program designed by the open source AppyBuilder software. The AppyBuilder is an open source software for easily building Android smartphone application. The advantages of the final circuit can be used to monitor step-up or step-down topologies, low-cost, and high-efficiency performance.
Volume: 9
Issue: 2
Page: 722-729
Publish at: 2018-06-01

Item Response Theory: An Introduction to Latent Trait Models to Test and Item Development

10.11591/ijere.v7i2.12900
Ado Abdu Bichi , Rohaya Talib
Testing in educational system perform a number of functions, the results from a test can be used to make a number of decisions in education. It is therefore well accepted in the education literature that, testing is an important element of education. To effectively utilize the tests in educational policies and quality assurance its validity and reliability estimates are necessary. There are two generally acceptable frameworks used in evaluating the quality of test in educational and psychological measurements, these are; Classical Test Theory (CTT) and Item Response Theory (IRT). The estimates of test items validity and reliability depend on a particular measurement model used. It is vital for a test developer to be familiar with the different test development and item analysis methods in order to facilitate the development of a new test. The CTT is a traditional approach which was widely criticise in the measurement community for its shortcomings such as sample dependency of coefficient measures and estimates of measurement error. However, the IRT is a modern approach which provides solutions to most of the CTT’s identified shortcomings. This paper therefore, provides a comprehensive overview of the IRT and its procedures as applied to test item development and analysis. The paper concludes with some suggestions for test developers and test specialists at all levels to adopt IRT for its identified crucial theoretical and empirical gains over CTT. IRT based parameter estimates should be superior and reliable than CTT based parameter estimates. With these features, IRT can help resolve the problems associated with test design based on CTT.
Volume: 7
Issue: 2
Page: 142–151
Publish at: 2018-06-01
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