Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,325 Article Results

Effects of Test Level Discrimination and Difficulty on Answer-Copying Indices

10.11591/ijere.v7i1.11488
Onder Sunbul , Seha Yormaz
In this study Type I Error and the power rates of ω and GBT (generalized binomial test) indices were investigated for several nominal alpha levels and for 40 and 80-item test lengths with 10,000-examinee sample size under several test level restrictions. As a result, Type I error rates of both indices were found to be below the acceptable nominal alpha levels.  The power study showed that average test difficulty was very effective for power (true detection) rates of indices. Clear patterns were observed for the increase of test difficulty in favor of both ω and GBT power rate. Contrary to expectations; average test discrimination was not as effective as average test difficulty. The results of the interaction effects of item discrimination and difficulty showed that for the cases whose b parameters were lower than 0 with weak discrimination, indices had weak power for both ω and GBT. In addition, for the cases whose b parameter levels were below zero with high discrimination indices, the power performance of both answer-copying indices were very weak. Results for test length showed that with the increase of test length the power rate of both ω and GBT tended to increase. Also, ω performed slightly better than GBT or very close to GBT for 80-item test length however, ω performed better than GBT in terms of power rate for the cases with 40-item test length
Volume: 7
Issue: 1
Page: 32-38
Publish at: 2018-03-01

Electromagnetic Radiation (EMR) of Human Body Before and After Jogging

10.11591/ijeecs.v9.i3.pp643-649
R.S. S.A.Kadir , Zunairah Hj Murat Zunairah Hj Murat , Nurul Izzati Nadiah Binti Md Suhaimi
The research is on the electromagnetic radiation of human body before and after jogging. 30 healthy students from UiTM with an age range of 23-25 years old volunteered. The seven locations of chakra points were measured. The body frequency (in MHz) is captured using frequency detector by taking the reading of the frequency 5 times at each point at the same location; hence, the average value is calculated for data analysis. This frequency measurement is recorded two times which is before and after jogging with a consistence protocol for all participants. The data in terms of frequency (Hertz) is converted into 15 colours of bio-energies representing the health level. The finding shows that 63.3% of participants’ health level improved after jogging. While 33.3% of participants had decrement in their health level. The results also indicate improvement in bio-energies score for five out of seven chakra points after jogging.
Volume: 9
Issue: 3
Page: 643-649
Publish at: 2018-03-01

Fractional Order PID Controlled Interleaved Boost converter Fed Shunt Active Filter System

10.11591/ijpeds.v9.i1.pp126-138
Purigilla Venkata Ramkumar , Munagala Surya Kalavathi
Interleaved Boost Converter (ILBC) is a better converter between Photo Voltaic(PV) source and shunt active power filter. This paper deals with comparison of time domain outputs of PI and Fractional Order PID(FOPID) controlled ILBC fed shunt active filter in a grid connected PV system. The aim of this work is to minimize current ripple using ILBC between PV system and filter to improve the dynamic performance of shunt active filter. Closed loop monitored PI and FOPID systems are modeled, and the corresponding results are presented. MATLAB results of load voltage, current, converter voltage and currents with FOPID exhibits enhanced dynamic response. The proposed FOPID controlled ILBC Fed Shunt Active Filter system (ILBCFSAF) has advantages like low settling time, less peak over shoot and reduced steady state error in load voltage. The simulation results of ILBCSAF are compared with the corresponding hardware results.
Volume: 9
Issue: 1
Page: 126-138
Publish at: 2018-03-01

Load Balance: Energy Efficient Routing Protocol in Wireless Sensor Network

10.11591/ijeecs.v9.i3.pp561-564
A. Mohamed Divan Masood , S. K. Muthusundar
Energy  consumption  is  one  of  the  major  issue  in Wireless Sensor Network  (WSN)  which reduces the lifetime of the network. In this developed work an  Cluster based Energy Efficient Routing Protocol (CBEERP) , which is  gathering the sensor hubs  in the system  into  clusters,  in this manner it productively decreased the flooding  traffic  during  discover the routing. The proposed CBEERP will balance the Energy in the Group by using some second order nodes. The reinforcement High effective hubs replace the cluster head after the cluster reaches to its threshold energy level. This CBEERP will help the effectiveness and lifetime of the system.
Volume: 9
Issue: 3
Page: 561-564
Publish at: 2018-03-01

Student Engagement and Assessment Modes: A Study

10.11591/ijere.v7i1.11342
Anil Pathak
The aim of this project is to attempt a factorial analysis of the congruence amongst three layers of assessments of Oral Presentation: Expert, Self, and Peer. Participants included graduate and undergraduate students of Asian background studying Research Writing at a technological university. The research instrument consisted of a set of assessment checklists with weighted and specified criteria for Expert, Self and Peer assessment of research presentations. Broader criteria were based on the following four factors: Use of spoken media, Use of visuals, Interrelationships, and Communicative Effect. Participants received training and were involved in a practice session on self and peer assessment before engaging in the assessment tasks. While the pilot study is unable to conclusively establish congruence among the modes of assessment, it is expected that results from a wider database would indicate the nature of well-defined assessment criteria and the ways they can be effectively communicated to assessors. The present study suggests that the differences in ratings given by peers and experts are not due to a lack of capability on the part of students, but due to lack of orientation and training. It is necessary to evolve criteria that are well-documented to enable students to evaluate their own performance as well as the performance of their peers as effectively as done by experts.
Volume: 7
Issue: 1
Page: 72-76
Publish at: 2018-03-01

An Assessment of Project Teacher Exchange for ASEAN Teachers (TEACH) Program

10.11591/ijere.v7i1.7635
Ma. Lourdes S. Agustin , Darryl Roy Montebon
Association of Southeast Asian Nations (ASEAN) integration aims to unite the South East Asian countries to promote better opportunities for the member countries in different areas such as economics and education. As a response, Philippine Normal University spearheaded the formation of the Association of Southeast Asian Teacher Education Network to promote collaboration with ASEAN countries and enhance teacher education programs. The formation of AsTEN creates the impetus to explore possibilities for the internationalization of teacher education programs among the ASEAN countries. Thus, the Institute of Teaching and Learning of PNU initiated the Project Teacher Exchange for ASEAN Teachers (TEACH). This paper reports the assessment of the piloting of the Project TEACH as experienced by the Thai participants. Moreover, this research aims to develop a model that can be utilized by other ASEAN communities as they prepare for their own international teacher education programs.
Volume: 7
Issue: 1
Page: 1–10
Publish at: 2018-03-01

Real Time Validation of EKF Estimator for Low Speed Estimation in DTC IMD

10.11591/ijpeds.v9.i1.pp433-442
Mini R , Binoj P.V. , B. Hariram Satheesh , Dinesh M.N.
Low speed estimation in DTC IMD is not accurate due to the presence of transient offset, drift and domination of ohmic voltage drop in the measured stator voltages and currents used for estimating the stator flux required for accurate estimation of speed. EKF is a nonlinear, recursive adaptive algorithm capable of estimating speed ranging from very low speed to rated speed using equation of motion from noisy measured currents and voltages based on state space technique. In the previous work a new state space model of IM was developed for estimation in EKF by feeding load torque profile as an input variable instead of estimating it by considering load torque as constant, validated using MATLAB-Simulink software. In this paper real time validation of the EKF controller with load profile fed as input for speed estimation in DTC IMD is carried out using OPAL-RT simulator and real time results validates the simulation results and proves the effectives of the new EKF for low speed estimation in DTC IMD
Volume: 9
Issue: 1
Page: 433-442
Publish at: 2018-03-01

Testing of a Solar-PV/Wind operated AC-DC Microgrid with LabVIEW Controller

10.11591/ijpeds.v9.i1.pp406-413
Vinu Thomas , Sivaprasad Athikkal , Kumaravel Sundaramoorthy , Ashok Sankar
This paper discusses about a LabVIEW based controller for the hybrid renewable energy system operated AC-DC microgrid with the major objectives of: i) predicting the power generation potential of the solar–PV and wind generators  ii) effective power management  iii) load scheduling based on the available power with the renewable sources and iv) grid/islanding mode of operation of the microgrid. In order topredict the output power of wind generator and Solar-PV system, an artificial neural network is developed.The laboratory-scale model of three phase, 400 V, 10 kVA microgrid structure is developed at National Institute of Technology Calicut, India. The developed LabVIEW based controller has been tested successfully for a real-time load and source in the laboratory environment. Test results show that the designed controller is effectively managing the output powerof the primary energy sources under different scenarios.
Volume: 9
Issue: 1
Page: 406-413
Publish at: 2018-03-01

Construct Validity and Reliability of Attitudes towards Chemistry of Science Teacher Candidates

10.11591/ijere.v7i1.11138
Woro Sumarni , Endang Susilaningsih , Yeri Sutopo
Developing students' positive attitude toward learning is one of the important things, because some researchers mention that attitudes toward the subjects are related to academic achievement. Teachers, in the implementation of learning can evaluate attitudes toward the subjects, in order to know how students' attitude toward learning that is/has been going on. Therefore, an attitude assessment is required for valid, reliable and practical learning. The purpose of this research is to develop a Likert scale type questionnaire that can measure students' attitudes toward chemistry. In this study initially has been compiled as many as 43 items. The items in the present scale were adapted from the Test of Science-Related Attitudes (TOSRA) and Attitudes towards Chemistry Lessons Scale (ATCLS). After the contents validation of the questionnaire by the expert, the questionnaire is tested on 245 college students. Determination of construct validity which is conducted with exploratory factor analysis obtained 32 items valid question. The result of factor analysis shows that the scale has nine factors that explain 62.105% of the total variance. In addition, it shows the finding of 'reliability coefficient (Cronbach' alpha) of 0.91. The results obtained showed that it has obtained valid and reliable questionnaires as a measuring tool that can be used to determine student attitudes toward chemistry in chemistry foodstuffs lectures.
Volume: 7
Issue: 1
Page: 39-47
Publish at: 2018-03-01

FPGA Based Selective Harmonic Elimination Technique for Multilevel Inverter

10.11591/ijpeds.v9.i1.pp166-173
T. Porselvi , K. Deepa , R. Muthu
Harmonic elimination at the fundamental frequency is very much appropriate for high and medium range of power generation and applications. This paper considers a new technique for selective harmonic elimination (SHE), in which the total harmonic distortion (THD) is minimized when compared with that of the conventional one. With this technique, the harmonics at lower order are eliminated, which are more predominant than the higher ones.Cascaded H-Bridge inverter fed by a single DC is considered which is simulated with the switching angles generated by both the conventional method of SHE and the new method of SHE. The simulated results of the load voltage and the waveforms of the harmonic analysis are shown. The THD values are compared for the two techniques.  The experimental results are also shown for the new technique. The switching angles are generated with the help of field programmable gated array (FPGA) in the hardware. The value of experimental THD of voltage is compared with that of simulated THD and the comparison prove that the results are satisfactory.
Volume: 9
Issue: 1
Page: 166-173
Publish at: 2018-03-01

Performance of Brushless DC Drive with Single Current Sensor Fed from PV with High Voltage-Gain DC-DC Converter

10.11591/ijpeds.v9.i1.pp33-45
G. G RajaSekhar , Basavaraja Banakara
This paper presents the performance of Brushless DC (BLDC) Motor drive with only one positioning sensor instead of three conventional sensors. The three sensor units are replaced with a single stator current sensor unit in DC bus which further reduces the cost increasing the reliability of the drive system. Using a single sensor in stator requires minimum electronic equipment for the purpose of measurement process. This paper evolves the BLDC motor drive fed from PV system. A high voltage-gain DC-DC converter is presented in this paper to step-up the voltage from PV system. The appropriateness of PV fed BLDC motor drive is verified for variable increamental speed with fixed torque and variable decremental speed with fixed torque operating conditions. BLDC motor drive performance is also performed for variable torque with fixed peed working condition. The proposed system and results are developed using MATLAB/SIMULINK software.
Volume: 9
Issue: 1
Page: 33-45
Publish at: 2018-03-01

Student Achievement in Turkey, According to Question Types Used in PISA 2003-2012 Mathematic Literacy Tests

10.11591/ijere.v7i1.11045
Yesim Ozer Ozkan , Nesrin Ozaslan
The aim of this study is to determine the level of achievement of students participating in Programme for International Student Assessment (PISA) 2003 and PISA 2012 tests in Turkey according to questions in the mathematical literacy test. This study is a descriptive survey. Within the scope of the study, the mathematical literacy test items were classified as multiple-choice, complex multiple-choice and constructed response items according to the different question types. The ratio of correct and partially correct and incorrect response given to each question type has been determined. Findings show that the achievements of students differ according to different types of questions. While the question type with the highest success average in the PISA 2003 test was multiple-choice, students got the highest scores from complex multiple-choice questions in the PISA 2012 test. The questionnaire with the lowest success average was found to be complex multiple-choice questions in the PISA 2003 test while students got the lowest scores from constructed response items in the PISA 2012 test. According to the constructivist education approach effectuated in 2005-2006 academic year, it is expected to observe a rise in constructed response question type; however, findings of the study reveal that the success of constructed response questions is decreased according to the application years.
Volume: 7
Issue: 1
Page: 57-64
Publish at: 2018-03-01

Path Optimization Algorithm in Wireless Sensor Network with Obstacle

10.11591/ijeecs.v9.i3.pp599-601
J. S. Praveen , Mr. Mayilvahanan
Clustering is used for prolonging the network lifetime in WSN. It groups sensor nodes into different groups and selects a single node as a cluster head (CH) for all the groups. CHS collect the data from consonant clusters and forward the data to base station. In this paper, we proposed path optimization algorithm in Wireless Sensor Network with an obstacle (POAWSNO) that periodically selects the cluster heads according to quality factor. The quality factor is estimated by three criteria including quality of the link, remaining energy and degree of the node. Path optimization technique determines the shortest path during obstacle present in the WSN. POT is used to reduce the hop count and packet delay. The simulation results demonstrate that this approach improves the throughput and reduce the loss of packets and energy consumption in the network using network simulator.
Volume: 9
Issue: 3
Page: 599-601
Publish at: 2018-03-01

Cassava Quality Classification for Tapioca Flour Ingredients by Using ID3 Algorithm

10.11591/ijeecs.v9.i3.pp799-805
Yohanssen Pratama , Hadi Sutanto Saragi
Cassava is one of the main foods consumed by Indonesian people and main ingredients to make tapioca flour. In North Sumatera there is factory that produced tapioca flour to fulfill consumer demand.  To be able to meet the needs of consumers and seize market share, the product must have a good quality. Product specifications are a reference for product quality and measured with 7 parameters. The seven parameters include whiteness, moisture content, spotness, ash content, thinness, residual screen, pH flour, which meets the Indonesian National Standard. In this research we use two parameters (whiteness and spotness) to determine the quality of cassava and help the factory to maintain their product quality. In here we use blob and edge detection method in image processing to detect spot and after that classified the cassava by using an ID3 algorithm. 
Volume: 9
Issue: 3
Page: 799-805
Publish at: 2018-03-01

Teachers' Obstacles in Implementing Numbered Head Together in Social Science Learning

10.11591/ijere.v7i1.11625
Harini Widyaningtyas , Retno Winarni , Tri Murwaningsih
This study is aimed at describing teachers’ obstacles in applying Numbered Head Together learning model in social science learning. The type of research is qualitative descriptive. The subject of the research is the third-grade teacher of elementary school in Sukoharjo Sub-district. The findings of the research were analyzed using interactive analysis of Miles and Huberman and were presented through descriptive narrative technique. The results reveal several obstacles that were experienced by the teachers. First, the time is limited. Second, the classroom atmosphere is noisy due to large number of students. Third, the number of students in total is not even. Fourth, the students interfere each other. Fifth, not all of the students work in the group. Sixth, the students are not actively responding. Seventh, the students are lack of confidence in the presentation.
Volume: 7
Issue: 1
Page: 25-31
Publish at: 2018-03-01
1 2 3
...
1954 1955
Show 1435 of 1955

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration