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29,065 Article Results

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

Novel Symmetric and Asymmetric Multilevel Inverter Topology for Permanent Magnet Synchronous Motor

10.11591/ijpeds.v8.i3.pp1002-1010
Aparna Prayag , Sanjay Bodkhe
In this paper a new, simple multilevel inverter topology is proposed. Multilevel inverter uses several dc sources and power switches to synthesize desired output voltage waveform. The single phase structure of proposed topology in this paper consists of two dc sources and eight power switches. When the magnitudes of dc sources are equal it operates in symmetric mode, however in order to increase output voltage levels unequal magnitudes of dc sources are selected, then it operates in asymmetric mode. So far, multilevel inverter topologies have been used in motor drive industry to run induction motors. Recently permanent magnet synchronous motors (PMSM) are replacing induction motors.  Multilevel inverter is an attracting choice for driving high performance PMSM. However very few studies discuss the performance of multilevel inverter fed PMSM. In this paper simulation of novel symmetric and asymmetric multilevel inverter is carried out to analyze performance of PMSM. The topology is investigated through computer simulation using MATLAB/Simulink.
Volume: 8
Issue: 3
Page: 1002-1010
Publish at: 2017-09-01

The Improvement of Solar Cell Output Power Using Cooling and Reflection from Mirror

10.11591/ijpeds.v8.i3.pp1320-1326
Budiyanto Budiyanto , Fadliondi Fadliondi
This paper explains the experimental investigation to improve the output power of solar cell using cooling and light reflection from mirrors. The results show that by adding mirror, the current and output power of solar cell increase but the open circuit voltage and maximum power voltage decrease due to heat. By adding cooling, the open circuit voltage and the maximum power voltage are improved, so the output power also increases.
Volume: 8
Issue: 3
Page: 1320-1326
Publish at: 2017-09-01

Effect of Ability Grouping in Reciprocal Teaching Technique of Collaborative Learning on Individual Achievements and Social Skills

10.11591/ijere.v6i3.6565
Sumadi Sumadi , I Nyoman S. Degeng , Sulthon Sulthon , Waras Waras
This research focus on effects of ability grouping in reciprocal teaching technique of collaborative learning on individual achievements dan social skills. The results research showed that (1) there are differences in individual achievement significantly between high group of homogeneous, middle group of homogeneous, low group of homogeneous, and heterogeneous group in reciprocal teaching technique of collaborative learning, (2) there are differences in students social skills significantly between high group of homogeneous, middle group of homogeneous, low group of homogeneous, and heterogeneous group in reciprocal teaching technique of collaborative learning strategy. Based on the results of descriptive statistical analysis showed that individual achievements on high group of homogeneous turned out to mean the highest increase in the amount of 19.50, the second followed then a heterogeneous group with a mean increase of 15.00, the third then middle group of homogeneous with a mean increase of 13.50, and the lowest low group of  homogeneous with a mean increase of 11.75; the social skills on high group of homogeneous showed mean the highest increase in the amount of 10.92, the second a heterogeneous group with a mean increase of 8.75, followed middle group of homogeneous with a mean increase of 8.55, and the lowest of the low group of homogeneous with a mean increase of 6.71.
Volume: 6
Issue: 3
Page: 216-220
Publish at: 2017-09-01

Design and Implementation of BLDC Motor with Integrated Drive Circuit

10.11591/ijpeds.v8.i3.pp1109-1116
Joon Sung Park , Ki-Doek Lee
The trend in the motor applications is to reduce weight and volume by increasing the efficiency. Because of the advantage of high efficiency and high density, interest in brushless DC motors and drives is increasing. Unlike DC motors, the brushless DC (BLDC) motors require inverter circuit and position detector. In this paper, we deal with the optimization of the BLDC motor, the inverter, and the position detector. The inverter is optimized to be mounted on the BLDC motor. This paper deals primarily with the design and implementation aspects of the BLDC motor and the integrated drive circuit. Experimental results for the prototype of the BLDC motor with integrated dirve circuit in the laboratory are presented to validate the feasibility.
Volume: 8
Issue: 3
Page: 1109-1116
Publish at: 2017-09-01

Self-tuning Position Control for the Linear Long-stroke, Compound Switched Reluctance Conveyance Machine

10.11591/ijpeds.v8.i3.pp1427-1440
J. F. Pan , Weiyu Wang , Zhang Bo , Norbert Cheung , Li Qiu
This paper proposes a long-stroke linear switched reluctance machine (LSRM) with a primary and a secondary translator for industrial conveyance applications. The secondary one can translate according to the primary one so that linear compound motions can be achieved. Considering the fact that either one translator imposes a time-variant, nonlinear disturbance onto the other, the self-tuning position controllers are implemented for the compound machine and experimental results demonstrate that the absolute steady-state error values can fall into 0.03 mm and 0.05 mm for the secondary and primary translator, respectively. A composite absolute precision of less than 0.6 mm can be achieved under the proposed control strategy.
Volume: 8
Issue: 3
Page: 1427-1440
Publish at: 2017-09-01

Genetic Algorithm for Grammar Induction and Rules Verification through a PDA Simulator

10.11591/ijai.v6.i3.pp100-111
Hari Mohan Pandey
The focus of this paper is towards developing a grammatical inference system uses a genetic algorithm (GA), has a powerful global exploration capability that can exploit the optimum offspring. The implemented system runs in two phases: first, generation of grammar rules and verification and then applies the GA’s operation to optimize the rules. A pushdown automata simulator has been developed, which parse the training data over the grammar’s rules. An inverted mutation with random mask and then ‘XOR’ operator has been applied introduces diversity in the population, helps the GA not to get trapped at local optimum. Taguchi method has been incorporated to tune the parameters makes the proposed approach more robust, statistically sound and quickly convergent. The performance of the proposed system has been compared with: classical GA, random offspring GA and crowding algorithms. Overall, a grammatical inference system has been developed that employs a PDA simulator for verification.
Volume: 6
Issue: 3
Page: 100-111
Publish at: 2017-09-01
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