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61.
Konstantinos Vryzas 《Learning, Media and Technology》2002,27(1-2):9-17
The purpose of this paper was to explore the degree of children's access to home computers. From this perspective research was carried out into the following: the initiative to purchase a home computer; the child's familiarisation with a computer at home; the child's computer activities. The research was based on a random sample of 993 children, of whom 305 had a home computer. The children learned about the computer through their older siblings or parents. The computer at home was used by children mainly for games but also in combination with other applications. The results of the research raise questions about the connection between the different use of the computer at home and at school. 相似文献
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Various aspects of computational thinking (CT) could be supported by educational contexts such as simulations and video-games construction. In this field study, potential differences in student motivation and learning were empirically examined through students’ code. For this purpose, we performed a teaching intervention that took place over five weeks, with two-hour sessions per week, plus two more weeks for the pretest and post-test projects. Students were taught programming concepts through a science project; one group represented the function of a basic electric circuit by creating a simulation, while the other group represented the same function by creating a video game in which a player should achieve a score in order to win. Video game construction resulted in projects with higher CT skills and more primitives, as measured through projects’ code analysis. Moreover, the video-game context seems to better motivate students for future engagement with computing activities. 相似文献
64.
Chariklia K. Deli Athanasios Poulios Kalliopi Georgakouli Konstantinos Papanikolaou Alexandros Papoutsis Maria Selemekou 《Journal of sports sciences》2018,36(19):2172-2180
The present study investigated the effect of Corinthian currant pre-exercise supplementation on metabolism, performance and blood redox status during, and after prolonged exercise. Eleven healthy participants (21-45y) performed a 90-min constant-intensity (60–70% VO2max) submaximal-trial, plus a time-trial (TT) to exhaustion (95% VO2max) after consuming an isocaloric (1.5g CHO/kg BM) amount of randomly assigned Corinthian currant or glucose-drink, or water (control). Blood was drawn at baseline, pre-exercise, 30min, 60min, 90min of submaximal-trial, post-TT, and 1h post-TT. Post-ingestion blood glucose (GLU) under Corinthian currant was higher compared with water, and similar compared with glucose-drink throughout the study. Respiratory quotient under Corinthian currant was similar with glucose-drink and higher than water throughout the submaximal trial. Accordingly, higher CHO and lower fat oxidation were observed under Corinthian currant compared with water. The TT performance was similar between Corinthian currant, glucose-drink and water. Redox status were similar under all three conditions. Reduced glutathione (GSH) declined while total antioxidant capacity (TAC) and uric acid increased during exercise. GSH and TAC returned to baseline, while uric acid remained increased the following 1h. Corinthian currant, although did not alter exercise-mediated redox status changes and performance, was equally effective to a glucose-drink in maintaining GLU levels during prolonged cycling. 相似文献
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Konstantinos B. Baltzis 《Education and Information Technologies》2010,15(1):19-36
Finite Element Method Magnetics (FEMM) is an open source finite element analysis software package for solving electromagnetic
problems. The program addresses 2D planar and 3D axisymmetric linear and nonlinear harmonic low frequency magnetic and magnetostatic
problems and linear electrostatic problems. It is a simple, accurate, and low computational cost freeware product, popular
in science and engineering. However its educational value has been underestimated. Use of the package in education is quite
rare. The aim of this paper is to explore the capability of FEMM to meet as a complementary tool the needs of teaching electromagnetics
in higher education. In order to demonstrate its use and exhibit the aid it offers in the teaching of electromagnetics illustrative
examples are given. Evaluations in both qualitative and quantitative data have also been conducted and presented. Useful conclusions
about its usage and potential applications in the teaching of electromagnetics in higher education are finally drawn. 相似文献
66.
Konstantinos Alexakos 《Cultural Studies of Science Education》2009,4(2):495-504
In his December editorial on Michael Reiss, Kenneth Tobin (Cult Stud Sci Educ 3:793–798, 2008), raises some very important questions for science and science teachers regarding science education and the teaching of creationism
in the classroom. I agree with him that students’ creationist ideologies should be treated not as misconceptions but as worldviews.
Because of creationism’s peculiarly strong political links though, I argue that such discussion must address three critical
and interconnected issues, including the uncertain state of teaching evolution in public schools nationally, the political
convergence of the creationist political beliefs with bigoted worldviews, and creationism’s inherent contrariness to science
and human progress. I suggest that we as science educators therefore not consider all sides to be equally right and to instead
take side against the politics of creationism. I also argue that we need much more serious discussion on how to better teach
science to students who hold creationist worldviews, and that science educators such as Reiss need to be part of that.
Konstantinos Alexakos is an assistant professor in the School of Education at Brooklyn College (CUNY). He is a former New York City high school science teacher and a former NYC transit worker. His research interests include sociocultural issues especially fictive kinships among minority science students and perseverance and success. 相似文献
| Konstantinos AlexakosEmail: |
Konstantinos Alexakos is an assistant professor in the School of Education at Brooklyn College (CUNY). He is a former New York City high school science teacher and a former NYC transit worker. His research interests include sociocultural issues especially fictive kinships among minority science students and perseverance and success. 相似文献
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Rizos D Karababa P Sarandakou A Panagiotakis O Haliassos A Makris K Psarra K Bairaktari E Spyropoulou P Nikolou C Galiatsatos N Trakas N Ferderigou A Seferiadis K;Greek National Clinical Chemistry Registration Commission 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2011,21(1):30-37
In Greece, there is no officially organized training in clinical chemistry for scientists. The Greek Society of Clinical Chemistry-Clinical Biochemistry decided to organize an intensive educational program of 18 seminars on clinical chemistry content as it is described in the EC4 Syllabus. The duration of each seminar was about 6 hours and consisted of 6 to 9 lectures. At the end of each seminar there was a voluntary written examination, comprised of 24 multiple choice questions. Successful completion of the Educational program was leading to a Certificate of Competence. Two cycles of the 18 seminars were performed: 1st cycle from October 2003 to December 2005 and 2nd cycle from March 2005 to October 2007. One hundred eighty nine colleagues was the mean attendance per seminar for the seminars of the 1st cycle and 38 colleagues for the seminars of the 2nd cycle. The mean participation to the examination for each seminar was almost 80% for the 1st cycle and 68% for the 2nd cycle. More than 80% of the participants performed Good or Very good in the examination in both cycles. It is estimated that more than 40% of the scientists who practice Clinical Chemistry in Greece, participated to this educational activity. This program is now provided as an e-learning application, and it is open for all scientists who want to follow the discipline of clinical chemistry. 相似文献
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Anna Tsatsaroni Konstantinos Ravanis Anna Falaga 《International Journal of Science and Mathematics Education》2005,1(4):385-417
This paper explores pre-school pedagogic practices related to science, and argues for the relevance of sociology of education for such exploration. It also argues that this approach has a wider applicability in analysing the effects of changes in education policy on (pre)school practice. A basic characteristic of pre-school organization in many western societies for many decades has been its play-like activity. This has required teachers to structure the experiences of young children by acting upon the contexts of learning rather than the content. However, current policy initiatives and developments in a number of countries in the 1990s, including Greece, demand that teachers make systematic use of specialised content from science, mathematics and other subjects to structure pre-school curriculum activities. In order to analyse pedagogical practice in a systematic way, and to explore issues such trends in policy might raise, we have obtained data by video-recording school science activities in a nursery classroom, and have developed a tool of analysis based on Bernsteins conceptual framework. In demonstrating the usefulness of the analytical tool, we provide evidence to support developing concerns that the emerging discourse of pre-school teaching and learning of specialised content is in tension with dominant pre-school pedagogical practices, and that the contradictory demands placed upon teachers might lead to a narrowing of the view of learning in pre-school classrooms. 相似文献
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Avi Arampatzis Konstantinos Zagoris Savvas A. Chatzichristofis 《Information processing & management》2013
Content-based image retrieval (CBIR) with global features is notoriously noisy, especially for image queries with low percentages of relevant images in a collection. Moreover, CBIR typically ranks the whole collection, which is inefficient for large databases. We experiment with a method for image retrieval from multimedia databases, which improves both the effectiveness and efficiency of traditional CBIR by exploring secondary media. We perform retrieval in a two-stage fashion: first rank by a secondary medium, and then perform CBIR only on the top-K items. Thus, effectiveness is improved by performing CBIR on a ‘better’ subset. Using a relatively ‘cheap’ first stage, efficiency is also improved via the fewer CBIR operations performed. Our main novelty is that K is dynamic, i.e. estimated per query to optimize a predefined effectiveness measure. We show that our dynamic two-stage method can be significantly more effective and robust than similar setups with static thresholds previously proposed. In additional experiments using local feature derivatives in the visual stage instead of global, such as the emerging visual codebook approach, we find that two-stage does not work very well. We attribute the weaker performance of the visual codebook to the enhanced visual diversity produced by the textual stage which diminishes codebook’s advantage over global features. Furthermore, we compare dynamic two-stage retrieval to traditional score-based fusion of results retrieved visually and textually. We find that fusion is also significantly more effective than single-medium baselines. Although, there is no clear winner between two-stage and fusion, the methods exhibit different robustness features; nevertheless, two-stage retrieval provides efficiency benefits over fusion. 相似文献
70.
Konstantinos Petrogiannis Edward C. Melhuish 《European Journal of Psychology of Education - EJPE》1996,11(2):177-191
The quality of the caregiving environment for young infants in day care centres in Athens was evaluated with 3 global measures; ITERS (Harms, Cryer, & Clifford, 1989), PROFILE (Abbott-Shim & Sibley, 1987a), CCFS (Dragonas, Tsiantis & Lambidi, 1995); and I measure of adult-child interaction (Arnett, 1989). Comparisons between the measures revealed great similarity of between the three global measures, but that the specific adult-child interaction measure appeared to be measuring a different aspect of quality of care. The general quality of care was low, lower than for other countries with similar research, and suggests the need for substantial improvement. 相似文献