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28,593 Article Results

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

Mediation Role of Locus of Control on the Relationship of Learned-helplessness and Academic Procrastination among College Students in Penang, Malaysia.

10.11591/ijere.v7i2.12597
Kususanto Prihadi , Christine Y.H. Tan , Reimy T.S. Tan , Poh Ling Yong , Jonathan H.E Yong , Sharvini Tinagaran , Chee Leong Goh , Yu Jin Tee
This study aims to study the mediation role of locus of control on the impact of learned helplessness on students’ academic procrastination. Studies reported that more than 70% university students procrastinate, and one of the causes is the perception that one is vulnerable or helpless in finishing the procrastinate tasks. It was hypothesized that internal locus of control iLOC can reduce the effect if the learned helplessness (LH) on academic procrastination. Data was collected from 60 university students by utilizing instruments such as Duttweiller’s Internal Control Scale, Pure Procrastination Scale (adapted for academic setting) and Learned Helplessness Scale. Multiple regression with Process add-on showed that full mediation occurred; the prediction of LH on procrastination became insignificant when iLOC is controlled. In other words, when students believe that they are in control of their events, the less likely they will procrastinate doing their tasks due to helpless feeling.
Volume: 7
Issue: 2
Page: 87–93
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

Optimization of Digital Histopathology Image Quality

10.11591/ijai.v7.i2.pp71-77
Furat N Tawfeeq , Nada A.S. Alwan , Basim M. Khashman
One of the biomedical image problems is the appearance of the bubbles in the slide that could occur when air passes through the slide during the preparation process. These bubbles may complicate the process of analysing the histopathological images. The objective of this study is to remove the bubble noise from the histopathology images, and then predict the tissues that underlie it using the fuzzy controller in cases of remote pathological diagnosis. Fuzzy logic uses the linguistic definition to recognize the relationship between the input and the activity, rather than using difficult numerical equation. Mainly there are five parts, starting with accepting the image, passing through removing the bubbles, and ending with predict the tissues. These were implemented by defining membership functions between colours range using MATLAB. Results: 50 histopathological images were tested on four types of membership functions (MF); the results show that (nine-triangular) MF get 75.4% correctly predicted pixels versus 69.1, 72.31 and 72% for (five- triangular), (five-Gaussian) and (nine-Gaussian) respectively. Conclusions: In line with the era of digitally driven e-pathology, this process is essentially recommended to ensure quality interpretation and analyses of the processed slides; thus overcoming relevant limitations.
Volume: 7
Issue: 2
Page: 71-77
Publish at: 2018-06-01

The Resistance Comparison Method Using Integral Controller for Photovoltaic Emulator

10.11591/ijpeds.v9.i2.pp820-828
Razman Ayop , Chee Wei Tan , Cheng Siong Lim
A Photovoltaic (PV) emulator is a device that produces a similar output as the PV module and it is useful for testing the PV generation system. This paper present a new and simple control strategy for the PV emulator using the combination of the Resistance Comparison Method with the Integral Controller. The closed-loop buck converter system with the current-mode controlled and the single diode model are used for the PV emulator. The results obtained from the proposed PV emulator are compared with the conventional PV emulator using the Direct Referencing Method as the control strategy. The proposed PV emulator produces a more accurate output, 74 % faster transient response, and a lower output voltage ripple compared to the conventional PV emulator.
Volume: 9
Issue: 2
Page: 820-828
Publish at: 2018-06-01

Transceiver Design for MIMO Systems with Individual Transmit Power Constraints

10.11591/ijece.v8i3.pp1583-1595
Raja Muthalagu
This paper investigate the transceiver design for single-user multiple-input multipleoutput system (SU-MIMO). Joint transceiver design with an improper modulation is developed based on the minimum total mean-squared error (TMSE) criterion under two different cases. One is equal power allocation (EPA) and other is the power constraint that jointly meets both EPA and total transmit power constraint (TTPC) (i.e ITPC). Transceiver is designed based on the assumption that both the perfect and imperfect channel state information (CSI) is available at both the transmitter and receiver. The simulation results show the performance improvement of the proposed work over conventional work in terms of bit error rate (BER).
Volume: 8
Issue: 3
Page: 1583-1595
Publish at: 2018-06-01

The Effect of Parameters Variation on Bilateral Controller

10.11591/ijpeds.v9.i2.pp648-659
Sari Abdo Ali , Muhammad Fahmi Miskon , Ahmad Zaki Hj Shukor , Marwan Qaid Mhoammed
This paper analyzes the effects of the bilateral control parameters variation on the stability, the transparency and the accuracy, and on the operational force that is applied to DC motor and the master system. The bilateral controller is designed for rehabilitation process. PD controller is used to control the position tracking and a force gain controller is used to control the motor torque. DOB eliminate the internal disturbance and RTOB to estimate the joint torque without using sensors. The system consists of two manipulators, each manipulator has 1dof, master and slave teleoperation system, 4 control-architecture channel, DOB and reaction force observer. The master system is attached to human oberator. The slave system is attached to external load. The aim in this paper is to design the controller so that it requires less force to move the master manipulator and at the same time achieve high performance in position tracking.
Volume: 9
Issue: 2
Page: 648-659
Publish at: 2018-06-01

Positioning of a Wireless Relay Node for Useful Cooperative Communication

10.11591/ijeecs.v10.i3.pp959-965
Tariq Muhamad Amjad , Elsheikh Mohamed Ahmed Elsheikh
Given the exorbitant amount of data transmitted and the increasing demand for data connectivity in the 21st century, it has become imperative to search for pro-active and sustainable solutions to the effectively alleviate the overwhelming burden imposed on wireless networks. In this study a Decode and Forward cooperative relay channel is analyzed, with the employment of Maximal Ratio Combining at the destination node as the method of offering diversity combining. The system framework used is based on a three-node relay channel with a source node, relay node and a destination node. A model for the wireless communications channel is formulated in order for simulation to be carried out to investigate the impact on performance of relaying on a node placed at the edge of cell. Firstly, an AWGN channel is used before the effect of Rayleigh fading is taken into consideration. Result shows that performance of cooperative relaying performance is always superior or similar to conventional relaying. Additionally, relaying is beneficial when the relay is placed closer to the receiver. 
Volume: 10
Issue: 3
Page: 959-965
Publish at: 2018-06-01

dSPACE DS1104 Based Real Time Implementation of Sliding Mode Control of Induction Motor

10.11591/ijpeds.v9.i2.pp546-558
Aymen Omari , I. K. Bousserhane , A. Hazzab , B. Bouchiba
In this paper, the design of a speed control scheme based on a total sliding mode control for Indirect Field Oriented of a three phase induction motor (IM) is proposed. Firstly, the indirect field oriented control is derived. Then, sliding mode control design is investigated to achieve a speed tracking objective under different load torque disturbance. Finally a dSPACE DS1104 R&D board is used to implement the proposed scheme. The experimental results released on 0.25 kW slip-ring IM show a high dynamic performance, fast transient response without overshot as well as a good load disturbances rejection response.
Volume: 9
Issue: 2
Page: 546-558
Publish at: 2018-06-01

A Novel Line Current Control Strategy to Control the Real Power Flow at PCC using H-bridge Inverter

10.11591/ijpeds.v9.i2.pp602-609
Qusay Salem , Jian Xie
This paper presents the power flow control between the main grid and the microgrid in low-voltage distribution network using H-bridge inverter. Controlling the real power flow in the line using the H-bridge inverter is investigated by implementing the line current control strategy. The feasibility of the proposed H-bridge inverter and its control strategy is validated by varying the line current reference. Hence, the H-bridge inverter will operate in its inductive or capacitive operation mode depending on the reference current value and the output of the PI controller in the control unit. The control strategy of the microgrid distributed generators has also been investigated in which P/V droop characteristics is applied to the power control of each DG in the microgrid. The effectiveness of the proposed approaches is validated through simulations. 
Volume: 9
Issue: 2
Page: 602-609
Publish at: 2018-06-01

PAPR Reduction Techniques in Generalized Inverse Discrete Fourier Transform Non-Orthogonal Frequency Division Multiplexing System

10.11591/ijeecs.v10.i3.pp1045-1052
Iram Maisarah Mokhtar , Norulhusna Ahmad , Hazilah Mad Kaidi , Mohd Azri Mohd Izhar , Norliza Mohamed
A promising system of Generalized Inverse Discrete Fourier Transform Non-Orthogonal Frequency Division Multiplexing (GIDFT n-OFDM) system can fulfil the requirement of supporting higher data rate in Fifth Generation (5G) technology. However, this system experience High Peak to Average Power Ratio (PAPR) due to massive number of subcarriers signal is transmitted. In this paper, three types of usual PAPR reduction techniques were applied in GIDFT n-OFDM system which are Clipping, Partial transmit Transform (PTS) and Selective Mapping (SLM). The system performance is compared and evaluated using Complementary Cumulative Distribution Function (CCDF) plot. Simulation results show that SLM technique give significant reduction of PAPR 9 dB of the original performance.
Volume: 10
Issue: 3
Page: 1045-1052
Publish at: 2018-06-01
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