Chris T. Panagiotakopoulos

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The purpose of this study is to examine the role of the computer with multimedia software in assessing the perception of the basic time concepts by children. Special multimedia software was developed, using a high level language which simulated standard time perception tests. A random sample of 374 school and preschool age (4–11 years old) children was used(More)
Online fora have become not only one of the most popular communication tools in e-learning environments, but also one of the key factors of the learning process, especially in distance learning, as they can provide to the students involved, motivation for collaboration in order to achieve a common goal. The purpose of this study is to analyse data related(More)
In this paper, we present recent work which has been accomplished in the newly introduced research area of privacy preserving record linkage, and then, we present our L-fold redundant blocking scheme, that relies on the Locality-Sensitive Hashing technique for identifying similar records. These records have undergone an anonymization transformation using a(More)
In this paper the complicated task of educational software evaluation is revisited and examined from a different point of view. By the means of Educational Data Mining (EDM) techniques, in the present study 177 of the most common evaluation standards that have been proposed by various researchers are examined and evaluated with regards to the degree they(More)
We examined how 1 st year students (10th grade) of Greek Senior High School could conceptualize the influence of the molecular weight of saturated fatty acids on the melting and the freezing point, during the 'change of phase' phenomenon using the Microcomputer-Based Laboratory (MBL) system. Students had to freeze a melted substance, observing at the same(More)
Our research is concerned with the visual representations found in textbooks used for the teaching of the Internet in Greek secondary schools. Visualization, as both the product and the process of creation, interpretation and reflection upon pictures and images, is considered here to be very important, as it is the only way students gain insight into the(More)
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