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27,404 Article Results

Predictive Control for Reduced Structure Multilevel Converters: Experimenting on a Seven Level Packed U-Cell

10.11591/ijpeds.v7.i2.pp568-582
Adel Nazemi , Omid Salari , Mohammad Tavakoli Bina , Masoud Kazemi , Bahman Eskandari
Recently, a branch of multilevel converters is emerged, in which their ‘reduced structure’ topologies use lower number of devices compared to the available topologies. To get a cost efficient converter, lower number of components as well as high quality waveforms, multilevel converters with a ‘reduced structure’ (MCRS) are suitable for high/medium power systems. Also, utilizing the fast microprocessors available today, applications of predictive control in power converters are of very powerful and attractive alternatives to classical controllers. This paper proposes a finite control set model-based predictive control (FCS-MPC) for load current regulation and capacitor voltage balancing for a typical MCRS. A case study considered, three-phase seven level packed U-cell (PUC), which is among reduced structure multilevel converters. A discrete model of the system is derived, and a predictive model-based control is developed according to this model in order to predict the future behavior of the system for all possible switching states; then, the switching state that optimized the cost function is selected. The feasibility of the proposed FCS-MPC strategy for a seven level PUC is evaluated based on simulations with MATLAB/ SIMULINK. Moreover, experimental validation of the proposed control system on a 5 kVA PUC is examined through DSP implementation.
Volume: 7
Issue: 2
Page: 568-582
Publish at: 2016-06-01

The Effect of Leadership, Organizational Culture, Emotional Intellegence, and Job Satisfaction on Performance

10.11591/ijere.v5i2.4534
Muhammad Ilyas , Tamrin Abdullah
This Researchaims to study the influence of Leadership, Organizational Culture, Emotional Quotation, and Job Satisfaction to Teacher Performance of Senior High School at Palopo Municipality South Sulawesi. Samplestudy involving 78 Teachers.The results are: (1) Leadership directly effects teacher performance (2)Emotional quotation directly influence teacher performance, (3) Job Satisfaction directly effects teacher performance, (4) Leadership directly effects job satisfaction, (5) Organizational Culture directly effects job satisfaction, (6) Emotional Quotattion directly effects job satisfaction.Based on this research, the factors of Leadership, Organizational Culture, Emotional Quotation, and Job Satisfaction to Teacher Performance should be developed by Central and Local Governmenteither Palopo or South Sulawesi.
Volume: 5
Issue: 2
Page: 158-164
Publish at: 2016-06-01

Development of Wireless Power Transfer using Capacitive Method for Mouse Charging Application

10.11591/ijpeds.v7.i2.pp460-471
S. Saat , O. Z. Guat , F.K. Abdul Rahman , A. A. Isa , A. M. Darsono
Wireless power transfer (WPT) is a non-contact power transfer within a distance.  With the advantage of not-contact concept, WPT enhances the flexibility movement of the devices.  Basically, there are three types of the WPT which are inductive power transfer (IPT), Capacitive Power Transfer (CPT) and Acoustic Power Transfer (APT).  Among these, capacitive power transfer (CPT) has the advantages of confining electric field between coupled plates, metal penetration ability and also the simplicity in circuit topologies.  Therefore, we focus on the capacitive method in this paper.  To be specific, this paper aims to develop a wireless mouse charging system using capacitive based method. This method enables wireless power transmission from mouse pad to a wireless mouse.  Hence, no battery requires to power up the mouse.  In this paper, a high efficiency Class-E converter is described in details to convert the DC source to AC and the compensation circuit of resonant tank is also proposed at the transmitter side in order to improve the efficiency. In the end, a prototype is developed to prove the developed method.  The performances analysis of the developed prototype is discussed and the future recommendation of this technique is also presented.
Volume: 7
Issue: 2
Page: 460-471
Publish at: 2016-06-01

Graduates’ Competence on Employability Skills and Job Performance

10.11591/ijere.v5i2.4530
Maripaz Carungay Abas , Ombra A. Imam
One critical measure of success in workplaces is employee’s ability to use competently the knowledge, skills and values that match the needs of his job, satisfy the demands of his employer, and contribute to the overall achievement of institutional goals. An explanatory-correlational research design was used to determine the extent of relationship between three categories of employability skills (using The Conference Board of Canada’s Employability Skills 2000+) and five elements of Contextual Performance adopted from Borman and Motowidlo’s Taxonomy. There were a total of 220 respondents representing the groups of employers and employees from 25 government institutions in the south-central part of Mindanao region, Philippines. Inferential analysis shows that fundamental skills had moderate relationship with employees’ contextual performance; however, being more competent in thinking and problem solving skills provides employees with more benefits in performing contextual behavior.  Findings further revealed that although personal management skills had moderate relationship with employees’ contextual behavior, the competence in personal adaptability and learning continuously are contributory across all elements of contextual performance. Finally, the result of the study yielded that teamwork skills, particularly the skill on working with others, were also moderately correlated with employees’ contextual performance. This implies that graduates’ competence in employability skills could give them due advantage in their respective work settings.  Thus, proper attention on developing competence on employability skills by employers, employees, higher academic institutions, labor agencies, and policy makers may help address the problems on job performance.
Volume: 5
Issue: 2
Page: 119-125
Publish at: 2016-06-01

Simulation and Implementation of Quasi-Z-Source Based Single-stage Buck/boost Inverter Fed Induction Motor

10.11591/ijpeds.v7.i2.pp369-378
P. Shunmugakani , D. Kirubakaran
Renewable power systems as distributed generation units often experience big changes in the inverter input voltage due to fluctuations of energy resources. Z-source inverter (ZSI) is known as a single-stage buck/boost inverter. The ZSI achieves voltage buck/boost in single stage, without additional switches. Triggering on state enables energy to be stored in inductors, which is released when at non-shoot-through state, followed by the voltage boost feature. The voltage-fed Z-source inverter/quasi-Z-source inverter (QZSI) have been presented suitable for photovoltaic (PV) applications mainly because of its single-stage buck and boost capability and the improved reliability.
Volume: 7
Issue: 2
Page: 369-378
Publish at: 2016-06-01

Learning Model and Form of Assesment toward the Inferensial Statistical Achievement By Controlling Numeric Thingking Skills

10.11591/ijere.v5i2.4532
I Wayan Widiana , I Nyoman Jampel
This study aimed to find out the effect of learning model and form of assessment toward inferential statistical achievement after controlling numeric thinking skills. This study was quasi experimental study with 130 students as the sample. The data analysis used ANCOVA. After controlling numeric thinking skills, the result of this study show that: (1) the inferential statistical achievement of the students group which follow SCSS learning model is higher than the group which follow conventional leare inferential statistical achievement of students group which got performance assessment is higher than conventional assessment, (3) there is interaction effect between learning model and form of assessment toward the students' statistical achievement, (4) in SCSS learning model, the students' inferential statistical achievement which got performance assessment is higher than the group which got conventional assessment, (5) in conventional learning model, the students' inferential statistical achievement which got performance assessment are lower than the group which got conventional assessment, (6) in performance assessment, the students' inferential statistical achievement which follow the study with SCSS learning model is higher than those which follow conventional learning model, and (7) in conventional assessment, the students' inferential statistical achievement which follow SCSS learning model is lower than the group which follow conventional learning model.
Volume: 5
Issue: 2
Page: 135-147
Publish at: 2016-06-01

Design Analysis of a Fish-Shaped PVDF Compliance Microgripper

10.11591/ijra.v5i2.pp67-71
Neeta Sahay
In this study the design and analysis of compliance microgripper made of piezoelectric PVDF (Poly Vinylidene Fluoride) material is presented. The inverse piezoelectric effect has been used in which the required amount of voltage has been applied at specific points at the base of the structure to produce the force at the tip and thereby the necessary deflection for gripping. The simulated results of frequency response, force-voltage relationship and displacement analysis are presented.
Volume: 5
Issue: 2
Page: 67-71
Publish at: 2016-06-01

A Review on LSB Substitution and PVD Based Image Steganography Techniques

10.11591/ijeecs.v2.i3.pp712-719
Aditya Kumar Sahu , Gandharba Swain
There has been a tremendous growth in Information and Communication technologies during the last decade. Internet has become the dominant media for data communication. But the secrecy of the data is to be taken care. Steganography is a technique for achieving secrecy for the data communicated in Internet. This paper presents a review of the steganography techniques based on least significant bit (LSB) substitution and pixel value differencing (PVD). The various techniques proposed in the literature are discussed and possible comparison is done along with their respective merits. The comparison parameters considered are, (i) hiding capacity, (ii) distortion measure, (iii) security, and (iv) computational complexity.
Volume: 2
Issue: 3
Page: 712-719
Publish at: 2016-06-01

Mobile Robot Framework Designing and Transferring of Data by PCI Controller

10.11591/ijra.v5i2.pp109-114
Alireza Rezaee
In this paper, a differential robot is designed and controlled by PCI card. This card connected between personal computer and microcontroller. Furthermore PID controller was designed by Asic device and implemented on robot.In this paper, instead of using that massive hardware’s, it designed a single FPGA chip to perform the same motion control of robot wheels. We developed a general purposed motion control of robot using a field programmable gate array (FPGA).In order to obtain independent robots movement, the main PID controller is implemented with a Field Programmable Gate Array. The main PID controller routine was designed to be fairly general purpose and modular form. While it is used to control a DC motor, it could be re-deployed to other situations where some parameter has to be controlled to a set value under varying conditions. The actual control software is located in a single function and its major inputs and output are held in a structure. Although it was designed originally for a specific job it is really only intended as an example of the basic techniques involved and to allow those with no control system knowledge to experiment with a simple PID system., FPGA, ATmega128L, Robot, Digital.
Volume: 5
Issue: 2
Page: 109-114
Publish at: 2016-06-01

Difficulties in Field-Based Observation among Pre-Service Teachers: Implications to Practice Teaching

10.11591/ijere.v5i2.4528
Maripaz C. Abas
Field-based observation has long been a central part of pre-service teacher education in many countries and is crucial for implementing effective practicum of student teachers. This paper focused on the perspectives of graduating pre-service teachers regarding their difficulties related to administrative support, cooperating teachers, student supervisors, students, peers, assigned tasks and learning environment during their 17-hour field observation in selected private and public secondary schools. An explanatory sequential mixed-methods research design was adopted utilizing survey questionnaire, Focus Group Interviews, and Key Informant Interview. Quantitative data were obtained from 136 sample respondents through stratified random sampling using proportionate allocation while qualitative data were gathered from 10 pre-service teachers, 10 cooperating teachers, six student supervisors and three school principals who were chosen purposively. Results of descriptive statistical analysis served as  basis  for  the  design  of  qualitative interview and focus group schedules which helped the researcher to  explain, or elaborate on the quantitative results” [1]. Findings of the study showed that pre-service teachers had over-all moderate difficulties during the field observation particularly on students, assigned tasks and learning environment. Findings of the study were substantiated through in-depth discussions of qualitative data. Implications were determined for continued enhancements of the practicum component that can help bridge the theory–practice nexus in pre-service teacher education, and contribute to the development of teachers’ professional competencies
Volume: 5
Issue: 2
Page: 101-112
Publish at: 2016-06-01

Modeling and Simulation of Hexapod Kinematics with Central Pattern Generator

10.11591/ijra.v5i2.pp72-86
Aju M.T.
The revealed secrets of nature always led humans to their aspiring achievements. The fastest animal on land is Cheetah and similar robot has developed by engineers so far to attain a record speed of 20mph among legged robots. But in nature there are some insects those are far ahead of cheetah in speed with a unit of body length per second. Insects are small in their body size with legs usually countable from 4 to 12 or more. With more legs they can have more stability and can adapt to different terrain faster while walking. Six legged robot (hexapod) is generally expect to attain higher speed in terms of body length per second, since the nature has proof for it. Bio-inspired Central Pattern Generator (CPG) is in use for so far in robotic world to mimic the locomotion patterns of insects and other animals. Currently the hybrid controller of CPG and reflex is going on and this paper suggests a new architecture for the system. Neural Network modeled CPG acts as the motor neuron for each joint of the leg. In each instant a neural network models the gait of the robot by learning procedure from the reflex system. This is like the Central Nervous System (CNS) selecting gait of an animal according to the terrain that travels. CNS takes sensory feedback from eyes, force on each leg and body balance from cochlea to adapt the gait for current terrain. This paper in first place tries to simulate the gait patterns for a hexapod.
Volume: 5
Issue: 2
Page: 72-86
Publish at: 2016-06-01

Design and Coordination of Cooperative Mobile Robots

10.11591/ijra.v5i2.pp115-135
Mohamed Krid
Object transportation is an important task considered in mobile robotics. For many years, it has been performed by single robots, capable to transport payload of moderate size and mass with respect to the robot size and mass. But if the payload gets bigger, the robot fails in the transporting task. For wider or heavier payloads, human operators improve their capacities by working in group. A similar improvement should be expected with a group of mobile robots.In this paper, we proposed a new concept of cooperative mobile robots to deal with the problem of long object transportation in unstructured environment whatever the payload length. The proposed C3Bots AT/VLP robot is formed by the association of two or more mono-robots with simple kinematics forming a poly-robot system.The paper presents several kinematic schemes and the corresponding obstacle-crossing processes. It deals with the problem of how to maintain stable motion for the poly-robot during obstacle crossing. Changes in the internal configuration of the robot adjust the center of gravity to guarantee stable motion. A specific stability criterion for contact on three wheels is presented. By adjusting the relative poses of the front and rear axles with respect to the payload, it is possible to maximize the stability of the poly-robot and its payload during obstacle crossing.
Volume: 5
Issue: 2
Page: 115-135
Publish at: 2016-06-01

A Reliability and Validity of an Instrument to Evaluate the School-Based Assessment System: A Pilot Study

10.11591/ijere.v5i2.4533
Nor Hasnida Md Ghazali
A valid, reliable and practical instrument is needed to evaluate the implementation of the school-based assessment (SBA) system. The aim of this study is to develop and assess the validity and reliability of an instrument to measure the perception of teachers towards the SBA implementation in schools. The instrument is developed based on a conceptual framework developed by Daniel Stufflebeam, that is the CIPP (context, input, process and product) Evaluation Model. The instrument in the form of questionnaire is distributed to a sample of 120 primary and secondary school teachers. The response rate is 80 percent. The content validity is assessed by the experts and the construct validity is measured by Exploratory Factor Analysis (EFA). The reliability of the instrument is measured using internal consistence reliability, which is measured by alpha coefficient reliability or Cronbach Alpha. The finding of this pilot study shows that the instrument is valid and reliable. Finally, out of 71 items, 68 items are retained.
Volume: 5
Issue: 2
Page: 148-157
Publish at: 2016-06-01

Using a Mobile Robot with Interpolation and Extrapolation Method for Chemical Source Localization in Dynamic Advection-diffusion Environment

10.11591/ijra.v5i2.pp87-97
Xiang Gao , Levent Acar
this paper address the problem of mapping likely particle path derived from a chemical source using interpolation and extrapolation method. Order localization is the problem of finding the source of an odor or other volatile chemical. Most localization method require the robot to follow the odor plume along its entire length, which is time consuming and may be especially difficult in a cluttered environment. In this paper, a map of sensors’ environment was used, together with the path line of airflow, to predict the pattern of air movement. The robot then used the airflow pattern to reason about the probable location of the odor source. This demonstrates that interpolation and extrapolation method can be used to assist odor localization search and indicates that similar techniques have great operating in an unstructured environment to reason about its surroundings. This paper present details of getting the model of particle path using interpolation and extrapolation method, model of particle path surrounding the obstacles and openings, result of practical odor source location simulation.
Volume: 5
Issue: 2
Page: 87-97
Publish at: 2016-06-01

The Relationship between Religiosity and Academic Performance amongst Accounting Students

10.11591/ijere.v5i2.4535
Umaru Mustapha Zubairu , Olalekan Busra Sakariyau
In this paper, the association between religiosity and academic performance among accounting students enrolled at the International Islamic University Malaysia (IIUM) is explored, as recent research demonstrates a positive association between religiosity and academic success. Students' religiosity was measured using proxies from an Islamic perspective, whilst their academic performances were measured using their Cumulative Grade Point Averages (CGPA). The statistical analysis revealed no significant correlation between religiosity and academic performance among accounting students at IIUM. However, a closer examination of the results revealed that students at IIUM possessed high levels of religiosity as well as high levels of academic performances.
Volume: 5
Issue: 2
Page: 165-173
Publish at: 2016-06-01
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