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This Monograph aims to contribute to the information processing, the differential, and the developmental modeling of the mind, and to work these into an integrated theory. Toward this aim, a longitudinal study is presented that investigates the relations between processing efficiency, working memory, and problem solving from the age of 8 years to to the age(More)
In order to integrate Robust Header Compression (ROHC) with IPsec, a mechanism is needed to signal ROHC channel parameters between endpoints. Internet Key Exchange (IKE) is a mechanism that can be leveraged to exchange these parameters. This document specifies extensions to IKEv2 that will allow ROHC and its associated channel parameters to be signaled for(More)
Designing successful learning environments entails drawing on theoretical perspectives on learning while, at the same time, being cognisant of the affordances and constraints of the technology. This paper reports on the development of a software environment called 3DMath, a dynamic three-dimensional geometry microworld aimed at enabling learners to(More)
IP Security (IPsec) provides various security services for IP traffic. However, the benefits of IPsec come at the cost of increased overhead. This document outlines a framework for integrating Robust Header Compression (ROHC) over IPsec (ROHCoIPsec). By compressing the inner headers of IP packets, ROHCoIPsec proposes to reduce the amount of overhead(More)
The purpose of this study was to modify and extend Technology Acceptance Model to assess secondary school teachers' intention to use Cabri in geometry teaching. We developed a measurement-structural model and enriched TAM by integrating in the model a new significant parameter, " perceived pedagogical-learning fit " , which refers to evaluating the(More)
This article focuses on the construction, description and testing of a theoretical model for the structure of 3D geometry thinking. We tested the validity and applicability of the model with 269 students (5 th to 9 th grade) in Cyprus. The results of the study showed that 3D geometry thinking can be described across the following factors: (a) recognition(More)
Integrating Robust Header Compression (ROHC) with IPsec (ROHCoIPsec) offers the combined benefits of IP security services and efficient bandwidth utilization. However, in order to integrate ROHC with IPsec, extensions to the Security Policy Database (SPD) and Security Association Database (SAD) are required. This document describes the IPsec extensions(More)
  • N Mousoulides, B Sriraman, M Pittalis, C Christou
  • 2008
In this study we report on an analysis of the mathematization processes of one 6 th and one 8 th grade group, with emphasis on the similarities and differences between the two groups in solving a modeling problem. Results provide evidence that all students developed the necessary mathematical constructs and processes to actively solve the problem through(More)
While, commonly across the world, selected key ideas of the Calculus are introduced to students in the final years of schooling, and are thence built upon as students take a full course in Analysis at University, there remains much to learn about how best to introduce such ideas and how to develop and expand the ideas at University level. This paper reports(More)