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11.
Using Laboratory Experiments and Circuit Simulation IT Tools in an Undergraduate Course in Analog Electronics 总被引：1，自引：1，他引：0
Konstantinos B. Baltzis Konstantinos D. Koukias 《Journal of Science Education and Technology》2009,18(6):546-555
Laboratory-based courses play a significant role in engineering education. Given the role of electronics in engineering and technology, laboratory experiments and circuit simulation IT tools are used in their teaching in several academic institutions. This paper discusses the characteristics and benefits of both methods. The content and structure of an introductory laboratory course in analog electronics is described. The aim of the course is the better understanding of the basic principles of analog electronic circuits without the need of specific technical and computer skills. The impact of the proposed method on the learning process is investigated. The evaluation of our proposal was based on both quantitative and qualitative data. Interesting conclusions about the teaching of electronics in undergraduate education are finally drawn. 相似文献
12.
This research, carried out in Greece on pupils aged 12–16, focuses on the transformation of their representations concerning
light emission and image formation by extended light sources. The instructive process was carried out in two stages, each
one having a different, distinct target set. During the first stage, the appropriate conflict conditions were created by contrasting
the subjects’ predictions with the results of experimental situations inspired by the History of Science, with a view to destabilizing
the pupils’ alternative representations. During the second stage, the experimental teaching intervention was carried out;
it was based on the geometrical optics model and its parameters were derived from Kepler’s relevant historic experiment. For
the duration of this process and within the framework of didactical interactions, an effort was made to reorganize initial
limited representations and restructure them at the level of the accepted scientific model. The effectiveness of the intervention
was evaluated two weeks later, using experimental tasks which had the same cognitive yet different empirical content with
respect to the tasks conducted during the intervention. The results of the study showed that the majority of the subjects
accepted the model of geometrical optics, that is, the pupils were able to correctly predict and adequately justify the experimental
results based on the principle of punctiform light emission. Educational and research implications are discussed.
相似文献
| Christos DedesEmail: |
13.
Konstantinos Niakaris Faidon Magkos Nikos Geladas Labros S Sidossis 《Journal of sports sciences》2013,31(10):1065-1073
The aims of the present study were to determine whether available “fasting” and oral glucose tolerance test-derived insulin sensitivity indices could effectively discriminate between individuals with higher than normal insulin sensitivity, and whether they would all provide similar information in clinical practice. Sprint runners (n = 8), endurance runners (n = 8) and sedentary controls (n = 7) received a 75-g oral glucose tolerance test. All participants were healthy lean males, aged 21?–?29 years. Besides glucose and insulin responses, a total of nine such indices were computed. Fasting as well as post-load glucose concentrations were similar in the three groups, while basal plasma insulin and the insulinaemic response to glucose were both higher in untrained individuals (at P?<?0.05 and P?<?0.02, respectively). There were no differences between endurance and sprint runners. The results for insulin sensitivity, however, were quite variable: three indices showed that both groups of athletes were more insulin-sensitive than controls; three indicated that this was the case for endurance runners only; one indicated that this was the case for sprint runners only; and two showed that sprint runners were more insulin-sensitive than either sedentary individuals or endurance runners (all differences were significant at P?<?0.05). Controlling for total body weight or lean mass did not effectively resolve this disagreement. Apparently, the various insulin sensitivity indices examined provided different quantitative and qualitative information, despite insulin action being greater in both groups of athletes relative to controls, as reflected by their similar glucose tolerance with lower insulin concentrations. We suggest, therefore, that the use and interpretation of such indices among physically active individuals be made with caution. 相似文献
14.
Konstantinos Petridis Chrisovalantis Malesios Garyfallos Arabatzis Emmanuel Thanassoulis 《Journal of Informetrics》2013,7(2):505-521
In this paper we attempt to assess the impact of journals in the field of forestry, in terms of bibliometric data, by providing an evaluation of forestry journals based on data envelopment analysis (DEA). In addition, based on the results of the conducted analysis, we provide suggestions for improving the impact of the journals in terms of widely accepted measures of journal citation impact, such as the journal impact factor (IF) and the journal h-index. More specifically, by modifying certain inputs associated with the productivity of forestry journals, we have illustrated how this method could be utilized to raise their efficiency, which in terms of research impact can then be translated into an increase of their bibliometric indices, such as the h-index, IF or eigenfactor score. 相似文献
15.
Konstantinos Ravanis Vasilia Christidou Vassilia Hatzinikita 《Research in Science Education》2013,43(6):2257-2276
The aim of this study is to investigate the effect of a sociocognitive teaching strategy on young children’s understanding of light. It explores their understanding of the concept of light as an entity that is transmitted independently of the light source and the final receiver. The study was conducted in three phases: pretest, teaching intervention, and post-tests. The sample consisted of 170 preschool children who were assigned to two groups. The children in the first group participated in activities which adopted a sociocognitive approach. In the context of this approach, a familiar metaphor was introduced in order to facilitate children to construct a “precursor model” about light. The children in the second group participated in activities with the same teaching objectives, but adopting an empiricist perspective. Statistical analysis using the Mann–Whitney U test indicated that the cognitive progress of the sociocognitive group was more significant than the progress of the empiricist group. This provides evidence for the effect of the sociocognitive strategy on enhancing children in constructing a “precursor model” for the concept of light. 相似文献
16.
Irini Dermitzaki Panayiota Stavroussi Denis Vavougios Konstantinos T. Kotsis 《European Journal of Psychology of Education - EJPE》2013,28(3):747-766
The present study aimed at adapting in the Greek language the Students' Motivation Towards Science Learning (SMTSL) questionnaire developed by Tuan, Chin, and Shieh (INT J SCI EDUC 27(6): 639-654, 2005a) into a different cultural context, a different age group, that is, in university students and with a focus on physics learning. Three hundred and fifty Greek student teachers participated in the study. The original instrument consisted of 35 items allocated in six scales: self-efficacy, use of active learning strategies, science learning value, performance goals, achievement goals, and learning environment stimulation. The instrument's internal consistency was acceptable and comparable to previous studies' reports. Confirmatory factor analysis (CFA) was applied on the data in order to test an a priori hypothesis regarding the SMTSL's factorial structure based on previous studies' findings. The results of the study showed that the six-factor conceptual model of students' motivation proposed by the SMTSL applies in this different cultural setting and in this group of university students with reference to physics learning. Along with the six distinct motivational constructs confirmed, students' motivational beliefs were also explained by a general motivational construct assumed to be at their basis. Suggestions for further improvement of the Greek version of the SMTSL are also discussed. 相似文献
17.
Marios Goudas Irini Dermitzaki Konstantinos Bagiatis 《European Journal of Psychology of Education - EJPE》2000,15(3):271-280
The aim of the present study was to examine the relations of students’ intrinsic motivation in physical education lessons with factors such as perceived locus of causality, perceived competence and outcome expectancies. Five hundred sixteen students of grades 7–12 participated in the study. The students were randomly selected from three schools located in a medium sized town in Greece. Perceived locus of causality was examined using Ryan and Connell’s (1989) motivational orientation scales, while intrinsic motivation was assessed by means of the Intrinsic Motivation Inventory (Ryan, 1982). Outcome expectancies for ten possible outcomes of school physical education were assessed by means of two different scales, namely outcome evaluation and outcome likelihood. Causal modelling analysis showed that intrinsic motivation was mainly influenced by perceived usefulness which in turned was influenced by outcome expectations. Moreover, outcome expectations also influenced perceived locus of causality. These results show that students’ outcome expectancies for their participation in school physical education is an important factor influencing their intrinsic motivation. 相似文献
18.
Konstantinos Zacharos Dimitris Koliopoulos Maria Dokimaki Helen Kassoumi 《欧洲师范教育杂志》2007,30(3):305-318
The questions this paper attempts to answer are related to the attitudes of student teachers of the Department of Early Childhood Education at the University of Patras (Greece) towards mathematics, as well as their views on the instruction of mathematics in Early Childhood Education. The research sample included 52 students in the fourth semester of studies, who were invited to answer a questionnaire with respect to mathematics and its instruction. The findings reveal the negative attitude our research subjects adopt towards mathematics. Their epistemological views on mathematics and its instruction do not constitute a single and solid conceptual system. These findings underline the need to improve the mathematical education offered to student teachers of Early Childhood Education.
Les questions posées par la présente recherche concernent les attitudes envers les mathématiques ainsi que les conceptions sur l'enseignement de mathématiques des étudiants—futurs enseignants du Département de l'Education Pré‐scolaire de l'université de Patras. Cinquante‐deux étudiants de la quatrième année de leurs études ont participé à cette recherche en remplissant un questionnaire sur les mathématiques et leur enseignement. L'analyse des réponses a montré que les étudiants ont des attitudes négatives envers les mathématiques et que leurs conceptions épistémologiques sur les mathématiques et leur enseignement ne constituent pas un cadre conceptuel unitaire et cohérent. Ces constatations soulignent la nécessite de reformulation du contenu de l'éducation mathématique adressé aux étudiants—futurs enseignants à l'école maternelle.
La pesquisa actual está intentando responder a cuestiones relacionadas con las actitudes de los estudiantes—futuros institutores—de la Facultad de Pedagogía Preescolar de la Universidad de Patras (Grecia), en relación a la matemática y con sus puntos de vista en relación a la enseñanza de los conceptos matemáticos en la Educación Preescolar. La muestra representativa de la investigación se compone de 52 estudiantes del cuarto semestre de la carrera a quienes se solicitó responder a un cuestionario relacionado con la matemática y su didáctica. El escrutinio del cuestionario indica que los sujetos de la muestra mantienen una actitud negativa ante la matemática y su didáctica. Además, sus convicciones y conjeturas de ellos no componen un sistema de comprensión unificado y conciso acerca de la matemática y su didáctica. Dicho escrutinio subraya que hace falta mejorar la educación de la matemática que se presta en nuestra Facultad de Pedagogía.
Die vorliegende Studie untersucht die Einstellung von Studenten—zukünftigen Lehrern—des Fachs Pädagogik am Institut für Frühe Kindheit, Universität Patras, Griechenland, gegenüber der Mathematik. Insbesondere befasst sie sich mit deren Wahrnehmung der Vermittlung von mathematischen Begriffen im Kindergarten. Im Rahmen der Studie wurden 52 Studenten des vierten Semesters aufgefordert, einen Fragebogen zur Mathematikausbildung auszufüllen. Aus den Ergebnissen resultiert eine negative Haltung der Befragten gegenüber der Mathematik und deren Unterricht. Des weiteren bilden ihre Wahrnehmungsweise der Mathematik und des Mathematikunterrichts kein einheitliches und konsistentes konzeptuelles System. Diese Ergebnisse heben die Notwendigkeit einer Verbesserung der angebotenen Mathematikausbildung in unserem Fachbereich Pädagogik hervor. 相似文献
19.
Anestis Koutsoudis Konstantinos Stavroglou George Pavlidis Christodoulos Chamzas 《Journal of Cultural Heritage》2012,13(2):187-194
The evolution of real time 3D graphics technologies in combination with high bandwidth Internet connections and modern Web browsers enable users to explore complex 3D scenes. As a rule, a virtual visitor has to manually explore the geometrically complex 3D model in order to discover points of interest. This manual exploration is a time consuming process that, in some cases, can be assisted by sets of predefined points of interest. In this paper, we propose the annotation of 3D scenes in order to equip the user with a text based 3D scene search engine. The search engine provides a query mechanism that unburdens the user from the time consuming process of manually exploring vast 3D scenes. It responds to queries by exploiting the metadata of each 3D model and returns textual and visual information along with a group of links that correspond to relative points of interest within the 3D scene. The search engine allows the virtual visitor to automatically be transferred to a specific point of interest. We have built a Web accessible prototype system that is able to handle queries related to historical data, topological relationships and architectural properties of buildings. A number of 3D reconstructions covering urban areas of cultural importance located in Northern Greece have been annotated and used in the search engine as case studies. The prototype system is based on open source technologies and on a hybrid metadata schema that is derived from the MIDAS Heritage and MACE schemas. 相似文献
20.
The aim of this study was to determine whether there are differences in the fatigability of plantar flexor muscles during sustained submaximal contractions in prepubertal boys and girls. Fifteen boys (age 10.0 +/- 1.0 years) and 15 girls (age 9.8 +/- 0.9 years) participated in the study. The fatigue protocol consisted of a 10 min isometric plantar flexion at 20% of the maximal voluntary contraction. Immediately after this, five maximal isometric contractions were performed with a 3 min interval between contractions. During the experiment, electromyograms of the agonist muscles soleus and medial gastrocnemius and antagonist tibialis anterior were recorded. We observed no differences between the sexes (P < 0.05) in the decrease in torque or in the recovery rate after the fatigue protocol. Nor were there any differences between the sexes (P < 0.05) in agonist or antagonist muscle activation during the fatigue protocol and recovery period. The results indicate that there are no differences in fatigability between prepubertal boys and girls during submaximal sustained contractions, probably because the agonist and antagonist muscles were activated similarly in both sexes. 相似文献