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Aytekin Bagis 《Journal of The Franklin Institute》2011,348(10):2795-2812
This paper presents a tuning approach based on a tabu search algorithm (TSA) to obtain the optimal proportional-integral-derivative (PID) controller parameters in order to achieve a desired transient response. TSA is used to determine the main parameters of the PID controller. The performance of the PID controlled system is examined by considering the characteristics of the step response of the plant. Simulation results demonstrate that the tabu algorithm based approach is one of the useful methods for PID controller tuning, and using by the presented method, performance of the controlled system can be significantly improved according to the given control specifications. 相似文献
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The purpose of this study is to identify how upper secondary school French students (Grade 10–12) interpret chemical transformation with regards to the changes within molecules and atoms, and in terms of intramolecular and/or intermolecular bond breaking. In order to identify and describe the students’ assimilated knowledge, four questions were asked to 930 students using a written questionnaire submitted a long time after the related teaching took place. There is much research into student learning in the concept areas discussed here (atoms and molecules, chemical change, chemical bonding), as reviewed in the paper. The present study presents data from an educational system where limited work has been reported in the international literature. The French system has its own unique curriculum, and is taught in the national language (where much of the existing research has concerned learning in Anglophile systems). The research reported here found that French secondary students experienced many similar difficulties in understanding these key scientific concepts to those that have been reported elsewhere, showing the cross‐cultural nature of the key educational issues. For example, many have difficulties in understanding the changes undergone by atoms and molecules in the course of a chemical reaction; many are not able to justify explicitly the breaking of inter‐molecular bonds and to interpret the breaking of intramolecular bonds in terms of reorganization of atoms, the target level of understanding in the curriculum from the end of Grade 9. However, it is also suggested that some of the specific characteristics identified here are linked to the ordering and language used in the French curriculum, and such cultural idiosyncrasies may offer useful insights into both problematic and valuable aspects of science pedagogy. 相似文献
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Aytekin Işman 《Educational technology research and development : ETR & D》1997,45(2):124-128
Conclusion In this paper, Rogers's diffusion theory was used to analyze the acceptance and implementation of the innovation of distance education in higher education in Turkey. Distance education was not successfully adopted between 1970 and 1980 in Turkey because of organizational problems. Distance education was effectively and efficiently diffused in Turkey after 1982. Thousands of students today earn university diplomas studying at a distance. On the other hand, problems of organization, technology, and perceptions remain to be addressed. It is to be hoped that in the future the OEF will be independent or have more autonomy. This will help it deliver instruction to its students.the evaluator of the Learning Community Link Project at the University. 相似文献
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In this paper, an evolutionary algorithm (EA)-based fuzzy proportional-derivative (PD)-type controller is employed to reservoir control of dams with the purpose of operating spillway gates during any flood of any magnitude, which is not predictable beforehand. EA is used to evolve the main parameters of the fuzzy PD controller. The use of the EA, in conjunction with a systematic neighborhood structure for the determining of fuzzy rule-base parameters, leads to a significant improvement in the performance of the controller. The major objective of the controller is to achieve better system performance over the conventional control methods. In order to demonstrate the high performance of the presented method, we simulate the control system using different probable inflow hydrographs of various magnitudes. The simulation results indicate that the EA-based fuzzy PD controller not only performs an accurate and efficient solution, but also exhibits more desirable and reliable results than the conventional approaches. 相似文献
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Aytekin Cokelez 《Research in Science Education》2012,42(4):673-686
The concept of the atom is one of the building blocks of science education. Although the concept is a foundation for students?? subsequent learning experiences, it is difficult for students to comprehend because of common misconceptions and its abstractness. The purpose of this study is to examine junior high school students?? (ages 12?C13) ideas about the shape and size of the atom and the evolution of these ideas over 2?years. The study??s sample size was 126 students, including 76 sixth-grade and 50 seventh-grade students. The educational curriculum and relevant literature guided the development of a questionnaire that consisted of three open-ended questions intended to determine students?? knowledge of the structure and physical properties of the atom. After administering the questionnaire, collected data were analysed qualitatively. The study shows that students had difficulty developing a mental image of the atom, and contrary to the conclusions of other studies, students demonstrated a preference for working with complex and abstract models. 相似文献
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Sedat?UcarEmail author Vehbi?Aytekin?Sanalan 《Journal of Science Education and Technology》2011,20(1):87-94
Reforms are typically criticized for failing to bridge the gap between practitioners and researchers and for the lack of research
support provided prior to implementation. Research has indicated that preservice teachers’ understandings of high-quality
science teaching are formed by teacher training programs. The purposes of this study are to investigate views about science
in preservice teachers in old and new teacher training programs and to determine whether and how these two programs shape
teacher trainees’ views of science. A total of 459 students from a 4-year elementary science teacher training program participated
in the study. A 41-item instrument was used to collect data. Four factors were extracted from the data, explaining 41.58%
of the variance, and the reliability was found to be .86. There were significant differences for both males and females between
the old and new programs. However, no difference was found between males’ and females’ total scores. In addition, students
from the two programs had significantly different scores on the sub-scales of “Anxiety” and “Uncertainty”. For example, males
in the new program had significantly higher scores on the “Anxiety” and “Uncertainty” sub-scales. The overall increase in
science course hours and decrease in science method course hours in the new program may account for these findings. 相似文献
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