Signal distortions in communication systems
occur between the transmitter and the receiver; these
distortions normally cause bit errors at the receiver. In
addition interference by other signals may add to the
deterioration in performance of the communication link. In
order…

The paper is dedicated to mechanisms for open
access to resource management in the Internet Protocol (IP)
multimedia networks. First we present the concept of IP
Multimedia Subsystem (IMS) and explain the IMS functional
architecture, principles of quality of service…

This paper presents the
generic layered architecture for mobility
models (LEMMA), which can be used to
construct a wide variety of mobility
models, including the majority of models
used in wireless network simulations. The
fundamental components of the
architecture are…

A hybrid system for detecting driver
drowsiness was examined by using piezofilm movement
sensors integrated into the car seat, seat belt and steering
wheel. Statistical associations between increase in the
driver drowsiness and the non-invasive and conventional
physiological indicators were…

Biomedical research increasingly requires for testings be conducted outside the lab, in the field such as the participant’s home or work environment. This type of research requires semi-autonomous computer systems that collect such data and send it back to the…

South Africa in recent years has continued to create significant excitement in R&D. This excitement is being supported by government, the National Research Fund (NRF), Department of Science and Technology (DST), industry and research organisations with strong collaboration and support…

Wide rural areas are often short of basic
communication facilities and suffer from harsh geographic and climatic environments. Wireless networks which offer ease of operation and low maintenance cost appears to be a fast and
feasible choice for service operators…

In many parts of Africa the application of information and communication technologies (ICTs) in higher education institutions offers a particularly interesting research problem. This is because of
the far-reaching consequences that information and communication technology (ICT) services and
education have…

The successful operation of the present Internet depends mainly upon TCP/IP which employs end-to-end congestion
control mechanisms built in the end hosts. In order to further enhance this paradigm of end-to-end control the
Random Early Detection algorithm (RED) has been…

This paper investigates the encryption efficiency of RC6 block cipher application to digital
images, providing a new mathematical measure for encryption efficiency, which we will call the
encryption quality instead of visual inspection, The encryption quality of RC6 block cipher…