Download the this issue (complete journal, excluding cover) (~1 MB).
Download the cover
(Editorial Board Information) (~236 kB).
Table of Contents
Object-Oriented Embedded C
Development of a Spoken Language Identification System for South African Languages
On the parametric curves for the design, performance optimization and characterization of the LPDA Antenna
Object-Oriented Embedded C by M. Neser and G. van Schoor
Abstract: This paper presents an object-oriented implementation of ANSI-C for embedded systems. It offers practical guidelines for producing generic software libraries and portable applications. While various object-oriented implementations of C is available, the aim is to impress a culture of producing safe, robust embedded software which can easily be shared and integrated amongst developers and systems. Starting from coding standards, a design philosophy is proposed for creating reusable drivers, services, applications and finally, a complete real-time operating system.
Download Paper (~302 kb)
Development of a Spoken Language Identification System for South African Languages by M. Peché, M.H. Davel and E. Barnard
Abstract: This article introduces the first Spoken Language Identification system developed to distinguish among all eleven of South Africa’s official languages. The PPR-LM (Parallel Phoneme Recognition followed by Language Modeling) architecture is implemented, and techniques such as phoneme frequency filtering, which aims to utilize the available training data tomaximumefficiency, are utilized. The system performs reasonably well, achieving an overall accuracy of 71.72 % on test samples of three to ten seconds in length. This accuracy improves when the predicted results are combined into language families, reaching an overall accuracy of 82.39 %.
Download Paper (~322 kb)
On the parametric curves for the design, performance optimization and characterization of the LPDA Antenna by L.I. Onwuegbuna and A.A. Jimoh
Abstract: This paper attempts to overcome the limitations of the parametric curves that characterize the performance of the Log Periodic Dipole Array Antenna (here after referred to as the LPDA). For instance, the parametric curves in design handbooks e.g. ARRL antenna handbook and other relevant literature e.g. Peixeiro do not contain those giving the relationship between the boom-length L and the number of dipole element N for any given bandwidth, even when it is known that these two parameters are the main cost determinants of a LPDA Antenna. The concept of convergence is introduced to aid cost optimization of the LPDA Antenna in terms of number of dipole element N. Although N is used as the minimization criterion, the criteria for establishing convergence encompass all the main electrical characteristics of the LPDA antenna, such as VSWR, gain and radiation patterns.
Download Paper (~437 kb)