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28,593 Article Results

Brain Image Segmentation using Level Set : An Hybrid Approach

10.11591/ijaas.v6.i3.pp258-267
P Sudharshan Duth , Vimal Viswanath , Pankaj Sreekumar
Advances in medical imaging technologies have given rise for effective diagnostic procedures. The acquisition promptness and resolution enhancements of imaging modalities have given physicians more information, less invasively about their patients. Active contours are used to segment, match and track images of an atomic structure by manipulating constraints derived from the image data together with prior knowledge about the location, size, and shape of these structures. The level set method is referred as a part of active contour family. The major disadvantages of level set method are initialization of controlling parameters and time complexity. The proposed method adopts Robust Spatial Kernel Fuzzy C-Means (RSKFCM) and Lattice Boltzmann Method (LBM) to overcome these drawbacks. RSKFCM is based on standard Fuzzy C-Means algorithm which uses Gaussian RBF kernel function as distance metric and incorporates spatial information. The LBM uses the energy function to determine and reduce the actual processing time which addresses the time complexity. The proposed system combines both RSKFCM and LBM to form a hybrid approach, and the system is tested on a large set of MRI brain images and the experimental results are found to be improved with respect to time complexity.
Volume: 6
Issue: 3
Page: 258-267
Publish at: 2017-09-01

Secure Cloud based Privacy Preserving DataMinning Platform

10.11591/ijeecs.v7.i3.pp830-838
S Kumaraswamy , Manjula S H , K R Venugopal
The adoption of cloud environment for various application uses has led to security and privacy concern of user’s data. To protect user data and privacy on such platform is an area of concern. Many cryptography strategy has been presented to provide secure sharing of resource on cloud platform.  These methods tries to achieve a secure authentication strategy to realize feature such as self-blindable access tickets, group signatures, anonymous access tickets, minimal disclosure of tickets and revocation but each one varies in realization of these features. Each feature requires different cryptography mechanism for realization. Due to this it induces computation complexity which affects the deployment of these models in practical application. Most of these techniques are designed for a particular application environment and adopt public key cryptography which incurs high cost due to computation complexity. To address these issues this work present an secure and efficient privacy preserving of mining data on public cloud platform by adopting party and key based authentication strategy. The proposed SCPPDM (Secure Cloud Privacy Preserving Data Mining) is deployed on Microsoft azure cloud platform. Experiment is conducted to evaluate computation complexity. The outcome shows the proposed model achieves significant performance interm of computation overhead and cost.
Volume: 7
Issue: 3
Page: 830-838
Publish at: 2017-09-01

Review and Comparison of Sensorless Techniques to Estimate the Position and Speed of PMSM

10.11591/ijpeds.v8.i3.pp1062-1069
Yusnida Ahmad Tarmizi , Kasrul Abdul Karim , S. Azura Ahmad Tarusan , Auzani Jidin
Sensorless technique becomes popular nowadays in electrical drive applications specificially for AC motor drive. It is applied to determine and estimate the rotor position especially for PMSM motor. This paper presents the comparison sensorless technique to determine and estimate the position and rotor of PMSM motor. PMSM motor is widely used in industrial and automation due to its high performance motor drive. However, the location of PMSM motor in humidity and harsh environment causing the accuracy of motor is inaccurate due to deterioration of position sensor . Therefore, many sensorless techniques have been proposed by previous researchers in order to solve the problem. This paper presents the review of several categories; Model Based Method, Saliency Based Method and Signal Injection, and Artificial Intelligence Based Estimator. In addition, sensorless techniques on each category have been compared and described in terms of their advantages and disadvantages.
Volume: 8
Issue: 3
Page: 1062-1069
Publish at: 2017-09-01

Water Pumping Using Solar Energy

10.11591/ijaas.v6.i3.pp221-229
Mehimmedetsi Boujemaa , Chenni Rachid
This article defines a simulation model of a simple system based essentially solar pumping of a photovoltaic generator and a DC motor with permanent magnet type of load as the centrifugal pump, in order to optimized the whole system it is necessary introduce a boost converter
Volume: 6
Issue: 3
Page: 221-229
Publish at: 2017-09-01

Performances Analysis of a Linear Motor for Sliding Door Application

10.11591/ijpeds.v8.i3.pp1139-1146
Aymen Lachheb , Jalel Khediri , Lilia El Amraoui
The present work deals to investigate the performance of linear switched reluctance motor designed for a sliding door application. The objective of this paper is to develop an analytical model in order to predict the dynamic behaviour of the studied motor. Firstly, the characteristics of the proposed motor in open loop operation was computed.Secondly, the effect of the load on the response of the motor was investigated. In this context, a two technoque in open loop were adopted to solve the error positioning with load and to damp the oscillation observed in the characteristics of the motor in order to obtain a smooth motion.
Volume: 8
Issue: 3
Page: 1139-1146
Publish at: 2017-09-01

Hybrid Photovoltaic and Wind Power System with Battery Management System using Fuzzy Logic Controller

10.11591/ijaas.v6.i3.pp268-273
M. Venkateshkumar , R. Raghavan
In recent year, the development of hybrid renewable energy sources has the important role of power generation. This paper focused on  design of hybrid PV / Wind power system and its battery management system. The fuzzy logic control based battery management system has been designed for effective power utilization. The proposed control to operate the battery charging and discharging mode during non-linear power generation. The battery will charge whenever the renewable energy power is greater than to consumer load power as well as the battery will discharge whenever the renewable energy power is lesser than to consumer load power. The proposed model will be simulated using Matlab environment and analysis the proposed system results. Finally, simulation results are evaluated and validating the effectiveness of the proposed controller.
Volume: 6
Issue: 3
Page: 268-273
Publish at: 2017-09-01

Identification of a Non-Linear System Using Volterra Series Model with Calculated Kernels by Legendre Orthogonal Function

10.11591/ijaas.v6.i3.pp185-192
Vahid Mossadegh , Mahmood Ghanbari
Modeling and identification of non-linear systems have gained lots of attentions especially in industrial processes. Most of the actual systems have non-linear behavior and the first and simplest solution in modeling such systems is to linearize them which in most cases the result of linearization is not satisfactory. In this paper, modeling of non-linear systems is investigated using Volterra series model based on Legendre orthogonal function. Expansion of Volterra series kernels by Legendre orthogonal functions causes a reduction in the number of model parameters; hence, complexity of calculations would be decreased. Besides, if the free parameter is selected properly in these orthogonal functions, error is reduced and convergence speed of parameters is increased which leads to an increase in identification accuracy. In this paper, identification of non-linear system is presented with Volterra series expanded by Legendre function and PSO algorithm is used to calculate the optimum free parameters of Legendre function. Finally, in order to validate the efficacy and accuracy, the proposed algorithm is implemented on a non-linear system i.e. heat exchanger with actual data
Volume: 6
Issue: 3
Page: 185-192
Publish at: 2017-09-01

Highly effective Security Techniques in OSN Based on Genetic Programming Approach

10.11591/ijaas.v6.i3.pp230-234
Y.N.S.R. Bharadwaj , K. Raja Sekhar
Assurance is one of the grinding centers that enhances when trades get mediated in Online Community Techniques (Online Social Networks). Diverse gatherings of utilization innovation specialists have limited the 'OSN security issue' as one of surveillance, institutional or open security. In taking care of these issues they have moreover overseen them just as they were person. We adapt that the elite security issues are caught and that evaluation on genuine feelings of serenity in Online Social Networks would advantage from a more exhaustive method. Nowadays, points of interest systems mean a critical piece of relationship; by losing security, these organizations will decrease a ton of pleasant areas to see as well. The inside motivation behind subtle elements security (Information Security) is risk control. There are a great deal of discovering works and exercises in security danger control (ISRM, for example, NIST 800-30 and ISO/IEC 27005. Regardless, only few works of appraisal focus on Information Security danger diminishment, while the signs depict normal determinations and suggestions. They don't give any use ideas concerning ISRM; truth be told diminishing the Information Security dangers in questionable conditions is cautious. Subsequently, this papers joined an acquired counts (GA) for Information Security danger loss of weaknesses. Finally, the parity of the associated system was broke down through a reflection.
Volume: 6
Issue: 3
Page: 230-234
Publish at: 2017-09-01

Phase-shifted Series Resonant Converter with Zero Voltage Switching Turn-on and Variable Frequency Control

10.11591/ijpeds.v8.i3.pp1184-1192
Mohamed Salem , Awang Jusoh , Nik Rumzi Nik Idris , Tole Sutikno , Yonis.M.Yonis Buswig
This paper presents a phase shifted series resonant converter with step up high frequency transformer to achieve the functions of high output voltage, high power density and wide range of Zero Voltage Switching (ZVS). In this approach, the output voltage is controlled by varying the switching frequency. The controller has been designed to achieve a good stability under different load conditions. The converter will react to the load variation by varying its switching frequency to satisfy the output voltage requirements. Therefore in order to maintain constant output voltage, for light load (50% of the load), the switching frequency will be decreased to meet the desired output, while for the full load (100%) conditions, the switching frequency will be increased. Since the controlled switching frequency is limited by the range between the higher and lower resonant frequencies , the switches can be turned on under ZVS. In this study, a laboratory experiment has been conducted to verify the effectiveness of the system performance.
Volume: 8
Issue: 3
Page: 1184-1192
Publish at: 2017-09-01

The Empirical Analysis to Enhance Taiwanese Satisfaction in Buying Vietnam coffee

10.11591/ijaas.v6.i3.pp274-282
Thi Nham Le , Chia Nan Wang , Ying Fang Huang
Vietnam coffee industry has been well-known over the world for many decades. However, Vietnam products do not meet Taiwan customers’ expectation, it has lead to urgent challenges for the industry. Therefore, the paper proposed the integrated approach by using exploratory factor analysis, reliability analysis and regression analysis. The results of this study were used to formulate and recommend on how to improve the products of Vietnam coffee by using SPSS statistics for analysis. The major findings of this paper was found out that there are six important determinants of Taiwanese decision-making in buying coffee. In order to enhance customer satisfaction with the coffee products from Vietnam, the companies need right strategies to improve these six groups of factors. The paper contributes meaningful and helpful results to the development of Vietnam coffee industry.
Volume: 6
Issue: 3
Page: 274-282
Publish at: 2017-09-01

A Novel Analysis of Improving Displacement Factor Using IVDFC in Distribution Systems

10.11591/ijaas.v6.i3.pp193-202
M. Padmarasan , C.T. Manikandan , N. Karthikeyan , L. Jayaprakash , C.S. Ajin Sekhar
In this paper discuss the new approach for improving displacement factor using an Interline Dynamic Voltage Restoring and Displacement Factor Controlling Device (IVDFC) in a distribution system. An Interline Dynamic Voltage Restorer (IDVR) is perpetually engaged in distribution systems to mitigate voltage sag/swell problems. An IDVR simply consists of numerous dynamic voltage restorers (DVRs) sharing a common dc link connecting independent feeders to safe electric power to critical loads. The IDVR is operated that it hold the voltage across the critical load bus terminals constant at system nominal frequency irrespective of the changes occurring in source voltages frequency. While one of the DVRs compensates for the local voltage sag in its feeder, the other DVRs reload the common dc-link voltage. For normal voltage levels, the DVRs should be bypassed. Instead of bypassing the DVRs in normal conditions, this paper proposes operating the DVRs, if needed, to improve the displacement factor (DF) of one of the involved feeders. DF improvement can be achieved via active and reactive power exchange (PQ sharing) between different feeders. To successfully apply this concept, several constraints are addressed throughout the paper. The simulation model for this system is developed using MATLAB which is shown that the voltage across the critical load is regulated completely.
Volume: 6
Issue: 3
Page: 193-202
Publish at: 2017-09-01

The Adolescents Overview with Healthy Sexual Behavior in the Risky Environment

10.11591/ijere.v6i3.6040
Sitti Nur Djannah
Teens today have experienced a shift in morality, thought and behavior patterns because they are influenced by foreign cultures. This is due to lack of progress, especially in the field of transport and telecommunications that are spreading globally at youth culture. Negative attitudes towards adolescent health, such as sexual activity also tend to increase. Turonggo Wiro Budoyo (TWB) Wirobrajan Yogyakarta youth association which is a group of teenagers in the field of traditional dance, jathilan, is identified as a group of young adults at risk of premarital sex. They almost have a close friend (dating) and have intercourse, which is interesting to explore. There are five teenagers who can maintain a healthy sexual behavior. The purpose of research is to know the description of personal factors and external factors that influence adolescents to be able to retain healthy sexual behavior in a risky environment in TWB Yogyakarta youth association. Based on in-depth interviews with five teenagers who declares themselves not dating and a group leader community of TWB, it was shown that an overview that affects teens still behave in a healthy sex despite being in a risky environment is an overview of personal where young people have the ability to hold back emotions, ideals and religiosity attitudes, while the picture of the external consists of a family function where parents do remind norms and religion as well as the ability of adolescents to maintain away from the influence of friends to behave deviate.
Volume: 6
Issue: 3
Page: 221-226
Publish at: 2017-09-01

Wind-PV Hybrid Energy Source Fed Three Level NPC with Quasi Z Source Network

10.11591/ijpeds.v8.i3.pp1285-1293
Palanisamy R , Vijayakumar K
Multilevel inverters find use in industrial drive applications and grid based power generation. Owing to the increasing power demand and rising conventional generation costs a new alternative in renewable energy source is gaining popularity and acceptance. A Wind-PV hybrid renewable energy source is proposed which increases power reliability and improves standalone generation efficiency. A Quasi Z source network allows inverter shoot through possibility while boosting the dc voltage fed to the Neutral Point Clamped MLI. Simulation results were obtained for two levels VSI and further simulations for 3 level quasi NPC-TLI verified using Matlab Simulink and hardware implementation results verified by using DSP controller
Volume: 8
Issue: 3
Page: 1285-1293
Publish at: 2017-09-01

Oral Exam System at Teacher Appointments in Turkey

10.11591/ijere.v6i3.5951
Ismail Colak , Selcuk Besir Demir
Oral Exam system is applied all over the world, is recently applied in Turkey. After teacher candidates pass the PESE (General Knowledge, General Skills, Educational Sciences, and TPFK), they receive Oral Exam, and they are appointed with the points they receive from this stage or they are considered as unsuccessful. In other words, while Oral Exams are used as the complementary elements of written and similar other exams in the world, they are used as the sole determinants of appointing teachers in Turkey, which is beyond being complementary. As a matter of fact, in countries where Oral Exams are applied, it is observed that this system is used sometimes for preferential purposes, and the influence of Oral Exams on appointment point is kept low. Another reason for the criticisms of the educational syndicates that are active in Turkey on Oral Exam application is the suspicion of its activating the “preferential treatment” mechanism, because evaluations have subjectivity in them; and the evaluations of the members of the commission about the answers of the candidates are not based on adequate and concrete data
Volume: 6
Issue: 3
Page: 227-232
Publish at: 2017-09-01

Mathematical Writing Errors in Expository Writings of College Mathematics Students

10.11591/ijere.v6i3.8549
Ive K. Guce
Despite the efforts to confirm the effectiveness of writing in learning mathematics, analysis on common errors in mathematical writings has not received sufficient attention. This study aimed to provide an account of the students’ procedural explanations in terms of their commonly committed errors in mathematical writing. Nine errors in mathematical writing were pre-defined namely, misuse of mathematical terms, misuse of mathematical symbols, incorrect notation, incorrect grammar, incorrect capitalization, no or incorrect punctuation, vague term, incorrect term, and lack of term or phrase. This study used qualitative method of research to keep a record of errors in mathematical writing. Conducted in the College of Education Arts and Sciences of De La Salle Lipa, the study involved twelve BS Mathematics students enrolled in Advanced Calculus 1 class as respondents. Results revealed that the most committed errors done in mathematical writing are incorrect grammar and misuse of mathematical symbols. Certainly, intervention programs on mathematics writing will bring favorable outcomes. Language courses in the students’ curriculum which tackle proper grammar usage may be integrated with writing about mathematics as part of the student activities. Such will provide the students with writing experiences fitted to their discipline. 
Volume: 6
Issue: 3
Page: 233-242
Publish at: 2017-09-01
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