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29,061 Article Results

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

Pulse Width Modulation Based Decentralized Street LED Light Dimming System

10.11591/ijpeds.v8.i3.pp1220-1229
Hussain Attia , Amjad Omar , Maen Takruri , Halah Y. Ali
The high power consumption of conventional street lighting systems, and the consequences on environmental ecosystem due to continuous turning ON of light, have led researchers to seek solutions to this problem. LED light dimming system has been presented in many studies using computerized systems with or without wireless monitoring facility. The demerits of these systems include complexity, high cost and unfixed data transfer speed. This paper proposes to reduce power consumption of street lighting through a decentralized light dimming system that is based on Pulse Width Modulation (PWM). This is in addition to replacing conventional high power lamps with lower power LED lamps. The dimming control circuit of this system is fixed on each pole and controlled individually resulting in faster and more reliable response. The proposed system uses the available infrastructure and is suitable for small or main streets regardless of the number of light poles. It is also flexible in its coverage distance due to the freedom of motion detector selection. The advantages of using LED lighting on the environment as compared to conventional lighting are explained. Simulations reveal the effectiveness of the proposed system on energy saving and on the environment.
Volume: 8
Issue: 3
Page: 1220-1229
Publish at: 2017-09-01

The Influence of Non-planar (Spatial) Links in the Static Characteristics Behavior of Planar Parallel Manipulator

10.11591/ijra.v6i3.pp151-167
Ganesh Mangavu , Karthikeyan. R , Venkitachalam. P , Guruguhan . G , S. Shrinithi , Kannan. S , Anjan Kumar Dash
Conventional planar manipulators have all their links in a single plane. Increasing payload at the end-effecter/mobile platform can induce high stress in the links due to cantilever nature of links. Thus it limits the total vertical load that can be applied on the mobile platform. In contrast to the links in conventional planar parallel mechanisms, non-planar links are proposed in this paper, i.e., links are made inclined to the horizontal plane and non planar legs are constructed. Although the links are made non-planar, the rotary (or prismatic) joints axes remain perpendicular (or parallel) to the plane of the base platform, which retains the planar motion of the end-effecter. For studying the application of such non planar links in planar manipulators, new models of inertia, stiffness and leg dynamics have to be developed. In this article, these models are developed and with the developed models, the static analysis is done on the planar manipulators with non-planar links and the performance is compared with the corresponding conventional planar manipulators.
Volume: 6
Issue: 3
Page: 151-167
Publish at: 2017-09-01

High Definition Video Compression Using Saliency Features

10.11591/ijeecs.v7.i3.pp708-717
Bhanu Rekha , Ravi Kumar AV
High Definition (HD) devices requires HD-videos for the effective uses of HD devices. However, it consists of some issues such as high storage capacity, limited battery power of high definition devices, long encoding time, and high computational complexity when it comes to the transmission, broadcasting and internet traffic. Many existing techniques consists these above-mentioned issues. Therefore, there is a need of an efficient technique, which reduces unnecessary amount of space, provides high compression rate and requires low bandwidth spectrum. Therefore, in the paper we have introduced an efficient video compression technique as modified HEVC coding based on saliency features to counter these existing drawbacks. We highlight first, on extracting features on the raw data and then compressed it largely. This technique makes our model powerful and provides effective performance in terms of compression. Our experiment results proves that our model provide better efficiency in terms of average PSNR, MSE and bitrate. Our experimental results outperforms all the existing techniques in terms of saliency map detection, AUC, NSS, KLD and JSD. The average AUC, NSS and KLD value by our proposed method are 0.846, 1.702 and 0.532 respectively which is very high compare to other existing technique.
Volume: 7
Issue: 3
Page: 708-717
Publish at: 2017-09-01

Working Memory and Behavioural Problems in Relation to Malay Writing of Primary School Children

10.11591/ijere.v6i3.8136
Sieak Ling-Teo , Kee Jiar-Yeo
Deficit in working memory is common among young children across multiple abilities. Teachers have pointed to poor memory as one contributing factor to inattentiveness and short attention spans as well as some behavioural problems among students. This study aimed to explore the relationship among working memory, externalizing and internalizing behavioural problems and Malay language (writing). A total of 469 children (aged 8 and 11 year-old) and 17 school teachers were involved in the current study. It was found that working memory, externalizing behavioural problems and internalizing behavioural problems played critical roles in affecting the scores of Malay language (writing) at school. Specifically, there were five predictor variables being found in the regression model namely verbal short-term memory, inattention, somatic complaints, visuospatial working memory and aggression. As a whole, the correlation for the fivefactor model yielded a great result of 0.987.
Volume: 6
Issue: 3
Page: 189-197
Publish at: 2017-09-01
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