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Öğe Assessment of knowledge and confidence for E-learning(Birlesik Dunya Yenilik Arastirma ve Yayıncilik Merkezi, 2019) Kaleci D.; Akleman E.One of the most important goals in E-learning is to guarantee that participants reach the learning objectives. We have observed that having the knowledge of the subject is not sufficient for reaching learning objectives. The participants must also develop understanding that they know the subject, which we have named confidence. In this work, we have demonstrated that it is possible to assess both knowledge and confidence using only two different types of multiple-choice test questions. We have developed 1) a method to design questions to identify both knowledge and confidence and 2) a method to estimate actual knowledge and confidence from answers. We have evaluated our method using Monte-Carlo simulations. Our simulations demonstrated that it is always possible to obtain reliable estimations for knowledge and confidence using approximately 100 multiple choice test questions in a given subject. © 2019 SciencePark Research, Organization & Counseling. All rights reserved.Öğe Experiential investigation of nonlinear acoustic field structure in two and three dimensions(Institute of Electrical and Electronics Engineers Inc., 2016) Kaleci D.; Şahin A.; Karaböcü B.In this paper, two and three dimensional experimental nonlinear acoustic pressure fields that are produced by circular sources are presented. We developed an experiment systems to measure results of nonlinear acoustic pressure fields for the first three harmonic components along both acoustic and radial axis, in both two and three dimensions. The use of sub-harmonics to improve the lateral and axial image quality is also discussed. In addition, the experimental results are compared with theoretical results for the first three harmonics and are observed to essentially consistent with the theoretical results. © 2016 IEEE.Öğe Integration of virtual reality fire drill application into authentic learning environments(Birlesik Dunya Yenilik Arastirma ve Yayıncilik Merkezi, 2018) Tepe T.; Kaleci D.; Tüzün H.In this study, a virtual reality fire drill application was developed with Head-Mounted Display virtual reality technology for university students. The aim of the study is to evaluate the integration process of this virtual reality application into authentic learning environments in terms of student opinions. Case study methodology was used in the study. The results show that this technology provides useful and permanent learning, practice opportunity to students, and this technology increases the motivation and engagement to the courses as well. It has been pointed out by the students that this technology should be used as a practice environment after the theoretical courses in authentic learning environments because this technology can save time and prevent cost lost in addition to avoiding risk factors. The physical environment of the classes can be improved and wireless virtual reality goggles can be used for using this technology, more effectively and efficiently as a course support material in authentic learning environments. © 2018 SciencePark Research, Organization & Counseling. All rights reserved.Öğe STEM education research: Content analysis(Horizon Research Publishing, 2018) Kaleci D.; Korkmaz Ö.People need to be qualified to adapt to innovations caused by the rapid change in information and technology. This would be realized with the integration of technology into education. In order to subsist in the world of science and technology the disciplines with an important role both now and in the future are science, technology, engineering and mathematics. In this regard, the number of studies conducted on the improvement of science, technology, engineering and mathematics (STEM) education is also increasing day by day. In this study information is given about the studies conducted on STEM and a total of 40 academic studies consisting of articles and papers published in national and international journals are discussed. Within this scope, studies conducted on the subject matter according to the results of the content analysis are investigated. Research approaches, research methods, learning environments, learning outcomes, data collection tools, research samples, STEM subjects of these studies and body of literature are evaluated. Data collected from the studies are analyzed with methods of descriptive statistics. Results are presented as frequencies and percentage tables. As a result of the study it stands out that qualitative researches are preferred more in STEM education studies, experimental studies and surveys are used as research methods and studies are conducted mostly with primary school students. It is considered that this study would be helpful to researchers eager to study on the subject. © 2018 by authors, all rights reserved.Öğe Ultrasonic evaluation of igneous and metamorphic rocks under compressive loading(Grup Matbaacilik, 2009) Karakus M.; Tütmez B.; Kaleci D.This research aims to assess deformability characteristics of extrusive volcanic and metamorphic rocks under compressive loading using ultrasonic wave propagation technique. An experimental methodology developed in house was used to measure applied load, resultant strain, P and S wave velocities along with maximum amplitudes simultaneously. Wave velocities were measured perpendicular to the compressional axis using pairs of receivers' lead-zirconate piezoceramic transducers (PZT) which are specifically designed for use in geological testing. PUNDIT instrument was used to generate low frequency ultrasonic pulses. According to the results, a non-linear relationship between velocities and stress level that rock specimens have undergone were found. Increase in velocities is closely related to closure of void spaces in the specimens. Rate of velocity increments was also found to be greatest at the early stress level. As a result, ultrasonic velocities can be used to detect high stress concentrations and to monitor stress level in the underground structures.
