Information and Communication Technologies (ICTs) are increasingly considered valuable tools in education, promoting the development of higher cognitive processes and allowing teachers and learners access to a plethora of information. This paper reports on two pilot studies conducted in South Africa in proto-typical previously disadvantaged schools and their surrounding communities. Each pilot ...

The staggering growth in communication technology and usage of public domain channels (i.e. Internet) has greatly facilitated transfer of data. However, such open communication channels have greater vulnerability to security threats causing unauthorized information access. Traditionally, encryption is used to realize the communication security. However, important information is not protected on...

The paper describes an event-based system to enable seamless communication over multiple heterogeneous networks. On the one side, it is desirable to have an addressing and routing mechanism that provides transparent network access to all connected nodes, on the other hand, when dealing with predictable systems, the different quality of service in different networks cannot be hidden. The approac...

Increased demand for bandwidth arises from a proliferation of applications such as voice, video and data traffic as well as by the bootstrapping effect of increased consumption resulting from lower rates and optical fiber enjoys monopoly in providing long distance communication with a remarkable error rate performance. Optical communication is driven by WDM technology that employs Erbium Doped ...

On the Internet, it is common practice to use a computer to provide web caching services. Such services aim to reduce network utilization and improve access time to a web page. Limited storage space and performance requirements, however, restrict the number of objects a web cache can store. The need to access new objects requires replacement of cached ones. Such replacement decisions may affect...

Multi-user detection allows for the efficient use of bandwidth in Code-Division Multiple-Access (CDMA) channels through mitigation of near-far effects and multiple-access noise limitations. Due to its inherent noise and multipath immunity, CDMA multi-access is being considered as a platform for personal communication systems (PCS). As CDMA based digital communication networks proliferate, the n...

The performance of Orthogonal Frequency Division Multiple Access (OFDMA) system degrades significantly in doubly dispersive channels. This is due to the fact that exponential sub-carriers do not match the singular functions of this type of channels. To solve this problem, we develop a system whose sub-carriers are chirp functions. This is equivalent to exploiting Fractional Fourier Transform (F...

Wireless mesh networks (WMNs) which mediates the broadband Internet access, have been recently received many attentions by the researchers. In order to increase capacity in these networks, nodes are equipped with multiple radios tuned on multiple channels emerging multi radio multi-channel WMNs (MRMC WMNs). Therefore, a vital challenge that poses in MRMC WMNs is how to properly assign channels ...

Digitalization and the emergence of the Internet have resulted in escalating access to information and communication. Given the circumstances that soaring access to information amounts to the intensification of misinformation and disinformation, a set of critical skills to navigate and critically assess the information is necessary. This paper outlines the significance of these skills, and prov...

Multiple input multiple output (MIMO) approach in fiber optical communication has emerged as an effective proposition to address the ever increasing demand for information exchange. In ergodic case, channels, associated with modes or cores both fiber, is modeled by Jacobi ensemble of random matrices. A key quantity assessing performance MIMO systems mutual (MI). We focus here on case arbitrary ...