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27,438 Article Results

Evaluation of Northwest University, Kano Post-UTME Test Items Using Item Response Theory

10.11591/ijere.v5i4.5953
Ado Abdu Bichi , Hadiza Hafiz , Samira Abdullahi Bello
High-stakes testing is used for the purposes of providing results that have important consequences. Validity is the cornerstone upon which all measurement systems are built. This study applied the Item Response Theory principles to analyse Northwest University Kano Post-UTME Economics test items. The developed fifty (50) economics test items was administered to a sample of 600 students. The data obtained was analysed using XCALIBRE 4 and SPSS 20v softwares to determine items parameters base on IRT models. Indicate that, the test measure single trait by satisfying the condition of unidimensionality. Similarly, the goodness of fit test revealed that, the two parameter IRT model was more suitable since no misfit item was observed and the test reliability was 0.86. The mean examinee ability was 0.07 (SD=0.94). The mean item difficulty was -0.63(SD=2.54) and mean item discrimination was 0.28 (SD=0.04). 16 (33%) items were identified as “problematic” based on difficulty indices, 35(71%) also failed to meet the set standards on the basis of discrimination parameters. it can be concluded that, using the IRT approach, the NWU Post-UTME items are not stable as far as item difficulty and discrimination indices are concerned. It is recommended that, the Post-UTME items should be made to pass through all process of standardisation and validation; test development and content experts should be involve in developing and validating the test items in order to obtain valid and reliable results which will lead to valid inferences
Volume: 5
Issue: 4
Page: 261~270
Publish at: 2016-12-01

Vector Control Realization of DFIG Under Grid Abnormalities using Real Time Digital Simulator

10.11591/ijpeds.v7.i4.pp1337-1347
Kanungo Barada Mohanty , Satish Choudhury , Madhu Singh
A grid connected doubly-fed induction generator (DFIG) system, driven by variable speed wind turbine is considered in this research to satisfy grid code requirements. Remaining grid synchronized and stable under voltage sag and voltage swell, obtaining power control through dc link voltage control, and providing unity power factor at grid terminals are the achievements. The DFIG system uses two back-to-back converters. Vector control strategy is used with the grid side and rotor side converters, and taken up for research for further improvement. The grid side converter controls dc-link voltage and maintains unity power factor at the grid connection point. The rotor side converter supplies the reactive power of the machine and maintains the speed constant irrespective of the transient behavior of the grid. In this paper the behavior of the DFIG system is analyzed under grid voltage fluctuation and the experimental results are obtained using RT-LAB. Main contribution of this work is in improving the DFIG system performance with grid low voltage and over voltage ride through capability through simulation, and its real time experimental verification.
Volume: 7
Issue: 4
Page: 1337-1347
Publish at: 2016-12-01

Validity and Realibility of Chemistry Systemic Multiple Choices Questions (CSMCQs)

10.11591/ijere.v5i4.5958
Erfan Priyambodo , Marfuatun Marfuatun
Nowdays, Rasch model analysis is used widely in social research, moreover in educational research. In this research, Rasch model is used to determine the validation and the reliability of systemic multiple choices question in chemistry teaching and learning. There were 30 multiple choices question with systemic approach for high school student class XI. In this research, a 164 student as the subject of the research. The data was collecting during March – April 2015. The data was analysis using Winsteps application with Rasch model. The reseach shows that 29 question of 30 questions was valid through Rasch model analysis. The reliability of systemic multiple choices question was 0.93, which is very good chategory.
Volume: 5
Issue: 4
Page: 306~309
Publish at: 2016-12-01

Denavit-Hartenberg Coordinate System for Robots with Tree-like Kinematic Structure

10.11591/ijra.v5i4.pp244-254
Alexander Kovalchuk , F. Akhmetova
The paper presents a modified Denavit-Hartenberg coordinate system resulted from joint application of graph theory and the Denavit-Hartenberg coordinate system, which was developed to describe the kinematics of robot actuators with a linear open kinematic chain. It allows forming mathematical models of actuating mechanisms for the robots with tree-like kinematic structures. The work introduces the concept of primary and auxiliary coordinate systems. It considers an example of making the links’ reachability matrix and reachability graph for the tree-like actuating mechanism of a robotic mannequin. The use efficiency of the proposed modified Denavit-Hartenberg coordinate system is illustrated by the examples giving the mathematical description of the kinematics and dynamics of specific robots’ tree-like actuating mechanisms discussed in the previously published papers. It is shown that the proposed coordinate system can also be successfully applied to describe the actuating mechanisms of robots with a linear open kinematic chain, which is a particular case of the tree-like kinematic structure. The absence of branching joints in it does not require introducing auxiliary coordinate systems and the parameters f(i) and ns(i) are necessary only for the formal notation of equations, which have similar forms for the tree-like and linear chains. In this case, the modified and traditional coordinate systems coincide.
Volume: 5
Issue: 4
Page: 244-254
Publish at: 2016-12-01

VMM based Secured Virtualization in Cloud-Computing

10.11591/ijeecs.v4.i3.pp643-648
P. ILA Chandana Kumari , S. Swarajya Laxmi , B. Rekha , B. Pravallika , G. Chaitanya , Syed Umar , Azeem Mohammed Abdul
Cloud computing, utility computing, the future will be the main IT field. The government and companies are realizing that foreigners can clearly increase the cloud with minimal costs and maximum flexibility in the plant or existing equipment. But the clouds to ensure user privacy and digital asset management challenge in cloud client. Protection must always contain a performance. The complex is a sure way to end the occupation of the problem, the study suggests two Ebionitism security architecture. The movement and different approaches to health and safety and the level of the best things for their security costs hyper-visor layer to a reduction in order to avoid false alarms
Volume: 4
Issue: 3
Page: 643-648
Publish at: 2016-12-01

Design and Control of Underwater Robots with Rotating Thrusters

10.11591/ijra.v5i4.pp284-294
Ali Jebelli , M. C.E. Yagoub , B. S. Dhillon
Among other robots, underwater robot design involves critical control issues due to complex non-linear force and turns controlling. In this paper, a robust approach was proposed to efficiently control the behavior of an underwater robot through five degrees of freedom. Also, by designing a new type of a pair of thruster with the ability to 360 degree rotation along with a mass shifter, it gives this possibility to the robot that easily and with a minimal energy, change its depth quickly, preserving its balance best possible at the same time.
Volume: 5
Issue: 4
Page: 284-294
Publish at: 2016-12-01

Teaching with Socio-Scientific Issues in Physical Science: Teacher and Students’ Experiences

10.11591/ijere.v5i4.5954
Joy de la Pena Talens
Socio-scientific issues (SSI) are recommended by many science educators worldwide for learners to acquire first hand experience to apply what they learned in class. This investigated experiences of teacher-researcher and students in using SSI in Physical Science, Second Semester, School Year 2012-2013. Latest and controversial news articles on sources of energy were chosen for analysis. Based on the findings, the teacher-researcher was able to choose issues based on a set of criteria and students related what they learned inside the classroom with real life situations and its positive and negative impact to people and environment. A model of learning approach for teaching SSI in Physical Science was proposed.
Volume: 5
Issue: 4
Page: 271~283
Publish at: 2016-12-01

Wireless Gesture Controlled Semi-Humanoid Robot

10.11591/ijra.v5i4.pp237-243
Toshika Fegade , Yogesh Kurle , Sagar Nikale , Praful Kalpund
Robotics is a field concerned with the “intelligent connection of perception of action”. The most common manufacturing robot is the robotic arm with different degree of freedoms. Today, these humanoids perform many functions to assist humans in different undertakings such as space missions, driving and monitoring high speed vehicles. They are called semi-humanoids because they resemble to upper part of human body.        The idea of this paper is to change perception of controlling robotic arm. This paper provides a way to get rid of old fashioned remote controls and gives an intuitive technique for implementation of Semi-Humanoid Gesture controlled robot. It includes two robot arms which are exactly similar to human arm (5 fingers) increasing sensitivity of the system. It includes motion sensors -flex and accelerometer (used in mobile phones for tilting motion). The system design is divided into 3 parts namely: Robotic Arm, Real time video and Platform.        The prime aim of the design is that the robot arm and platform starts the movement as soon as the operator makes hand and leg gesture. The Robotic arm is synchronized with the gestures (hand postures) of the operator and the platform part is controlled by the leg gestures of the operator.  The robot and the Gesture device are connected wireless via RF. The wireless communication enables user to interact with the robot in an effortless way.
Volume: 5
Issue: 4
Page: 237-243
Publish at: 2016-12-01

Dynamic Analysis Of Two Link Robot Manipulator For Control Design Using PID Computed Torque Control.

10.11591/ijra.v5i4.pp277-283
Jolly Atit Shah , S S Rattan
Due to their advantage of high speed, accuracy and repeatability, robot manipulators have become major component of manufacturing industries and even now a days they become part of routine life.            Two link robot manipulator is a very basic classical and simple example of robot followed in understanding of basic fundamentals of robotic manipulator. The equation of motion for two link robot is a nonlinear differential equation. For higher degrees of freedom, as the closed form solutions are very difficult we have to use numerical solution. Here we focused mainly on control of robot manipulator to get the desired position using combination of two classical methods PID and computed torque control method after deriving the equation of motion. For the same simulation is represented using MATLAB and compared with computed torque control method.
Volume: 5
Issue: 4
Page: 277-283
Publish at: 2016-12-01

Measurement of Attitudes Regarding Foreign Language Skills and Its Relation with Success

10.11591/ijere.v5i4.5959
Tülin Acar
The aim of this research is to determine the attitudes of secondary level students regarding the skills in English as a Foreign Language and to compare the level of relationship between the academic success at English and the attitudes measured. Attitudes and success levels of the students of secondary education regarding their language skills were found to be high. A significant relationship at a linear low level was observed between the academic success of the students and their attitudes towards English language skills. In this study, the attitudes of high school students measured according to their gender concerning their reading, writing, speaking and listening skills, showed difference in favor of female students. Again, high school students’ attitudes towards writing, speaking and listening skills except for the attitudes towards reading skills do differentiate according to the type of school in which they receive education.
Volume: 5
Issue: 4
Page: 310~322
Publish at: 2016-12-01

Preference of Students on the Format of Options in a Multiple-Choice Test

10.11591/ijere.v5i4.5956
Voltaire Quiza Oyzon , Hermabeth O. Bendulo , Erlinda D. Tibus , Rhodora A. Bande , Myrna L. Macalinao
Schools in the Philippines, especially those that are offering teacher education programs, are advised to construct examinations that are Licensure Examination for Teachers (LET)-like test items. This is because “if any aspect of a test is unfamiliar to candidates, they are likely to perform less well than they would do otherwise on subsequently taking a parallel version, for example.” Using the education students of Leyte Normal University, Southern Leyte State University-Tomas Oppus Campus, and Visayas State University, this study determined the students’ preference on the arrangements/format of options in a multiple-choice test through a survey questionnaire. Moreover, it tried to find out the reasons behind the preferences. Mean, frequency and Chi-square tests were used in the analysis of data. Results revealed that the cascading arrangement is the most preferred arrangement of options and the one-line horizontal arrangement is the least preferred arrangement of options in a multiple-choice test. The reasons identified were organized and easy to read, less confusing and easier to distinguish and vertically arranged thus require less eye movement. Moreover, the reasons for the lower case preference were it is usual and commonly used in a multiple-choice test, clear and gives less eye and mental pressure and easier to read and write.And lastly, the relationship between the students’ preference of the arrangement of options in a multiplechoice test and the letter case options were tested using the Chi-square test. Hence, it is argued that in constructing a multiple-choice test, one has to consider using the cascading arrangement.
Volume: 5
Issue: 4
Page: 292~299
Publish at: 2016-12-01

Development of Teach Pendent based Robotic Arm for Drawing using Mechatronics Approach

10.11591/ijra.v5i4.pp230-236
Harikrishnan Madhusudanan
The main scope of this project is to use mechatronics approach to design and develop a complete humanoid robotic arm which can be used to draw different figures. A mechatronic approach is basically a synergistic combination of mechanical, electrical and control systems such that each and every stage of the product life cycle of the final product gets optimised. So, this approach which is used in this project would ensure that the robotic arm which would be the final product would have its design metrics optimised at each and every stage of its development cycle. The motive of developing this arm is to ensure that the final arm which is produced could be easily attached to the complete humanoid robot and would enable it to draw any kind of complex figures using highly accurate teach pendent mechanism.
Volume: 5
Issue: 4
Page: 230-236
Publish at: 2016-12-01

Self-Corrective Autonomous Systems using Optimization Processes for Detection and Correction of Unexpected Error Conditions

10.11591/ijra.v5i4.pp262-276
Nicoladie D. Tam
A theoretical framework for autonomous self-detection and self-correction of unexpected error conditions is derived by incorporating the principles of operation in autonomous control in biological evolution.  Using the biologically inspired principles, the time-dependent multi-dimensional disparity vector is used as a quantitative metric for detecting unexpected and unforeseeable error conditions without any external assistance.  The disparity vector is a measure of the discrepancy between the expected outcome predicted by the autonomous system and the actual outcome in the real world.  It is used as a measure to detect any unexpected or unforeseeable errors.  The process for autonomous self-correction of the self-discovered errors is an optimization process to minimize the errors represented by the disparity vectors.  The strategies for prioritizing the urgency of corrective actions are also provided in the theoretical derivations.  The criteria for any change in direction of the corrective actions are also provided quantitatively.  The criteria for the detection of the minimization and maximization of errors are also provided in the autonomous optimization process.  The biological correspondences of the emotional responses in relation to the autonomic self-corrective feedback systems are also provided.
Volume: 5
Issue: 4
Page: 262-276
Publish at: 2016-12-01

Preliminary Analysis of Assessment Instrument Design to Reveal Science Generic Skill and Chemistry Literacy

10.11591/ijere.v5i4.5961
Woro Sumarni , Sudarmin Sudarmin , Wiyanto Wiyanto , Supartono Supartono
The purpose of this research is to design assessment instrument to evaluate science generic skill (SGS) achievement and chemistry literacy in ethnoscience-integrated chemistry learning. The steps of tool designing refers to Plomp models including 1) Investigation Phase (Prelimenary Investigation); 2) Designing Phase (Design);  3) Construction/Realization Phase (Realization/Construction) ; 4) Test, Evaluation and Revision Phase. (Test, Evaluation and Revision).  To test the validity of assessment instrument, it was used content validity by three experts as validators, while to test the practical, it was used questionnaire which were given to 22 college students of food ingredients chemistry that is integrated of ethno-science and two supporting lecturers. The result of content validity showed that assessment tool which was developed was valid stated by experts with the reliability coefficient was 0,72. Every lecturers and 21 students gave positive response, so it can be concluded that developed assessment instrument was practice to use.
Volume: 5
Issue: 4
Page: 331~340
Publish at: 2016-12-01

Adjustment and Other Factors Related to High School Aged Students Identified as Hearing Impaired

10.11591/ijere.v5i4.5952
Charlene Milano , Tara Upshire , Sarah Scarazzo , Benjamin P. Schade , Karen H. Larwin
Healthy social, emotional and cognitive development of deaf children depends upon complex interactions between the many individual and environmental factors associated with deafness. Deaf children and adolescents have been reported to possess greater rates of mental health problems than hearing children and adolescents. Dysfunction in one or more systems impacts the other systems in the child’s life. Dysfunction increases the risk for maladjustment and poor mental and emotional health. Deaf youth are at greater risk for disruption in interactions between the child and their environment and therefore are also at greater risk for social and emotional problems. Data from the National Longitudinal Study of Adolescent to Adult was used to gain a better understanding of deaf student’s feelings of acceptance at school, reported positive feelings, academic grades and future plans. Twelve (12) deaf students were included in a total of 456 youth participants from across the county. No significant differences were found between the two groups. 
Volume: 5
Issue: 4
Page: 255~260
Publish at: 2016-12-01
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