SATNAC 2009 Conference Papers
Work in Progress – Poster Session
Authors: Meredith Barnes
Abstract: Legacy systems are often at the centre of business procedures of large organisations resulting in a need to modernize these systems as they can begin to resist change over time. The primary goal of this paper is to describe a comparative study of two modernization approaches applied to the same legacy system to generate data services. The two approaches are white-box and black-box. The white-box approach requires knowledge of legacy code and functionality whereas the black-box approach wraps the legacy code in a software adapter layer. The analysis of the data services generated by the modernization will be based on quality metrics for services, effectiveness of the services generated and developer’s effort to migrate the legacy systems to services. The contribution of this research is to provide developers with knowledge of which approach is more suitable to modernize legacy systems for a SOA.
Authors: Mncendisi Bembe (Council for Industrial
and Scientific Research), Albert Lysko (Council for Industrial and Scientific
Research), Thulani Nyandeni (
Abstract: The electronically steerable parasitic array radiator (ESPAR) antenna system is configured with one feed radiating element and N-parasitic radiating elements. The radiation pattern is electronically controlled by means of the variable devices loading the parasitic elements. These imply the achievement of low power antenna system with low fabrication cost. The ESPAR antenna can be designed to cover the frequency bands of the wireless local area network (WLAN), which are 2.4GHz and 5.8GHz. The modification can be achieved by loading the antenna elements with lumped circuits and a matching network system. This will be done by using the genetic algorithm optimisation technique.
Authors: Johan Brits (
Abstract: This paper discusses the concept design and preliminary results on the implementation of an ad hoc network for wildlife telemetry tracking. The design problem overview is given, as well as background on ad hoc networks. A detailed link budget is calculated using the Radio Mobile software. The paper then continues to describe constraints in the design of the network and evaluates MAC and routing protocols for implementation. A design methodology is stipulated for the mathematical modelling and simulation of these protocols.
Chidyiwa (University of
Abstract: This research serves to investigate the adequacy and suitability of agent platforms for rural e-Service provisioning. The adoption of new and innovative forms of service provision such as the use of Agent architecture may help improve service provision in rural areas. A basic network monitoring application will be deployed on Jade and Aglets mobile agent platforms as a basis for comparing these two platforms in terms of the robustness and fault-tolerance, mobility, intelligence, and suitability for rurality context.
Chivese (University of
Abstract: In a world of technological advancement
people rely mostly on phones as the medium of choice for communication and also
for any services of interest for example banking services. This provided
reliable services because you are not limited by time or position, you can
access these services any time of the day and anywhere at any particular day. A
rural remote area Dwesa in the
Authors: Folasade Dahunsi (
Abstract: Location Based Services (LBS) are an important aspect of the ubiquitous wireless world and are paving the way to provide users with customizable services anywhere and at anytime. LBS have varying accuracy requirements and not all location methods can provide the required LBS accuracy at a particular geographical location due to error sources. The sources of errors include geographical sources, wireless environment sources, measurement bias, geometric sources, etc. This paper presents work in progress on the development of an adaptive and environment-aware positioning based on the dynamically varying factors that affects the location method. The developed location method will allow mobile network operators to compare different location methods to ensure the provision of guaranteed quality of service to the mobile user and optimized usage of infrastructure.
Authors: Alrich Els (
Abstract: Modern managers increasingly base their business decisions on the evaluation and interpretation of data. To assist with the decision making process, many mathematical models can be applied. In this study, two specific models viz. Linear Response Surface Analysis (LRSA) and Data Envelopment Analysis (DEA) will be investigated and compared with specific reference to the telecommunications industry. The final objective is to provide a framework that can be used to guide decision makers in selecting the appropriate model under certain circumstances.
Authors: Mandlenkosi Gwetu (
Abstract: The growth of the World Wide Web (WWW) has seen it evolve into a rich information resource. It is constantly traversed with the aid of crawlers so as to harvest web content. When collecting data, crawlers have the potential of causing service denial to web servers. This paper proposes the application of sampling as a selection strategy in the design of web crawlers. This has the benefit of alleviating the problems of bandwidth costs to web servers whilst retaining the quality of the data that is mined by crawlers. The initial results of this study are promising and are presented in this paper.
Authors: Bulumko Hlungulu (University of
Abstract: Rural communities are limited from accessing health information available on internet or the South African Department of Health website. This is due to poor infrastructures (i.e. lack of clinics or Internet) and that gives them problems in accessing information about health. The availability of Information and Communication Technologies (ICTs) in a rural community can provide the community with a number of benefitial solutions to their problems. This paper gives a description of an on-going e-Health component development process for Dwesa-Cwebe rural community using Free and Open Sources Software. This Rural community is situated in the Province of Eastern Cape of South Africa.
Authors: Dumani Kunjuzwa (University of
Abstract: It is evident that Information and Communication Technology (ICT) is widely used in rural communities. Today we easily get connected and communicate with the rest of the world through communication technologies such as the Internet and telephones. An Interactive Voice Response (IVR) system is one of the tools which are used by small and large organizations for communication purposes. This system helps clients of the organization to acquire information without physically visiting the organization. The goal of this research is to develop a framework with IVR components which will allow one to develop an IVR system.
Authors: Josias Le Roux (University
Abstract: The paper presents work in progress for research on high power fiber lasers (HPFL). A fiber laser is a laser in which the active gain medium or the laser medium is an optical fiber usually doped with rare-earth elements such as erbium,ytterbium, and neodymium. The functionality of a basic laser, enabling high output power and the difficulties in achieving them are covered in the paper. Concepts such as stimulated emission and coherent light are briefly discussed and the aims of the research are also defined. In the past, fiber lasers have been unable to meet high output power requirements for industrial and military applications, but due to the growth in technology through the years, a number of methodologies have been developed to achieve output powers of 1kW and more. It is possible to achieve an output power of 1kW or more with a fiber laser by changing some of the fiber laser components and determining the correct methodology to be used.
Authors: Johan Magnus (
Abstract: An ad-hoc network is a wireless network without fixed infrastructure. The nodes are free to move around and this makes it a challenge for routing protocols to manage the data transfer on networks. The nodes can be various devices ranging from laptops to cell phones that use the IEEE 802.11 standard protocol to communicate with each other. In this paper we investigate the need that exists for efficient routing protocols for wireless networks, more specifically ad-hoc networks. Most of the current reactive routing protocols use hop count to determine the shortest path from source to destination. We proposed to implement bandwidth as an additional metric in the DSR protocol.
Authors: Moshe Masonta (
Abstract: The rapid growth and development observed in wireless communications has resulted in the overcrowding of the radio spectrum used as a communication medium in wireless networks. In many countries, governmental agencies regulate the use of the radio spectrum by assigning a portion of the spectrum in the form of a renewable license to any company or person who wishes to use the wireless medium for communication purposes; this is in order to allow efficient utilization of this scarce resource. The need to close the digital divide means that cost effective communication technologies should be deployed in rural areas for wireless broadband connectivity. Cognitive Radio (CR) is seen as a technology that will bring a new communication paradigm to address spectrum scarcity in the most energy efficient manner. In this paper we present the proposed work to be carried out as part of a doctoral thesis to address the spectrum scarcity and transmission power in energy constrained rural areas.
Abstract: A key aspect facet of the System Architecture Evolution is the specification of the Evolved Packet Core which supports multiple access networks. While the user roams from one network to another, a seamless handover is required to provide superior quality of service. One of the crucial goals of the EPC is to provide seamless mobility across multiple radio access technology as the mobile terminal traverses networks. And with an increased demand in real time applications, means of handling large volumes of traffic are needed thus making route optimization important. This Work in Progress paper proposes an elementary hybrid client-network based mobility protocol to make FMC ascertain together with a route optimization solution to realize local breakout.
Authors: Paco Mendes (
Abstract: A widget is a packaged, interactive client-side application, authored using Web standards and capable of accessing local and remote data services. Widgets have become an alternative approach for developing interactive television (ITV) applications that make use of Web based services. A film rating system is being developed using a widget-based approach. A custom platform API and supporting Web service is being implemented to emulate a distributed ITV application. The goals of this research are to evaluate widget approaches to distributed software development and to model the relationship between the key sub-systems of a widget-based ITV application.
Authors: Bwini Mudimba (
Abstract: Our FundaWethu software program is a Computer Aided Instruction (CAI) system designed to deliver reading lessons to Grade R-3 (foundation phase) children who are learning to read in a multilingual context. Starting from a premise that the system should be ¹"edutainment" based, the system allows literacy researchers or teachers to construct rich multimedia reading lessons, with words, animated pictures, and prerecorded syllables, words or sentences. The objective is to make the lesson authoring easy enough for use by non computer specialists, but expressive enough to enable a wide range of beginners reading exercises to be constructed in a number of different languages. This paper therefore outlines the process of
Authors: Ray Musvibe (
Abstract: This paper describes the development of a Video on Demand service using Mobicents JSLEE , an open source Service Delivery Platform. A discussion is given on the component architecture of Mobicents JSLEE and how the programmatic components interact. An evaluation of available open source IMS clients with video support for the envisioned service is also given.
Authors: Muyowa Mutemwa (University of the
Abstract: This paper seeks to discuss work in progress to implement a preliminary mock-up of a Deafto-hearing communication aid on a mobile phone. The goal is to ease communication between a Deaf and hearing users with interpreted communication between sign language and English on a mobile platform. The mock-up is meant to help a Deaf person convey medical conditions to a doctor face-to-face in the office. The user interface has pre-recorded sign language videos for the Deaf user, and English text for the doctor. This paper introduces the background of the project and briefly discusses related technology. Results from a preliminary trial of the PC-based mock-up with actual Deaf users are reported and discussed. Finally mapped out is a way to implement the communication aid system on a mobile device in a context free manner, allowing the plug and play of more communication scenarios.
Authors: Sakhile Ncanana
Abstract: Transport Layer protocols (TLP), protocols responsible for connection establishment and ensuring that all data are transmitted from source to target destination safely. TLPs provide QoS in various ways, but we are unable to identify the optimal protocol, since TLPs have not been compared in a consistent manner in previous works. We have designed the framework based on the literature, which we followed to analyse, categories and select the representatives TLPs samples to be compare and in order recommend the design features for and ideal TLPs that should be followed when designing the TLP for WMNs.
Authors: Shange-Ishiwa Ndakunda (
Abstract: This paper describes a study of the issues surrounding location-based services (LBSs) and the lack of sufficient LBS development facilities in the Mobicents JAIN-SLEE service delivery platform. A discussion of important location-based services standards highlights a protocol-independent model that includes a Location Generator (LG), a Location Server (LS) and a Location Receiver(LR). This paper proposes the use of the Mobicents service delivery platform as a Location Server for LGs and LRs developed with a location-based services toolkit tailored for the Mobicents environment.
Authors: Nkanyiso Ndlovu (University
Abstract: As demand for new, reliable, flexible and relatively inexpensive internet access in marginalized rural areas in developing countries increases, there is a need to amalgamate broadband technologies such as WiMAX and WiFi so as to extend the coverage area. Consequently, this will enable provision of high-speed mobile data and telecommunications services. This paper describes how WiMAX and WiFi can be merged together, with VSAT technology offering backhaul internet connectivity to provide ever present broadband access. We also look at their respective network applications and how there are going to be used to help support ICT4D activities in these marginalized areas.
Authors: Sikhumbuzo Ngwenya
Abstract: The services provided by the use of dynamic Information and Communication Technology tools have influenced the lives of people in various ways. These include better communication platforms such as the Internet where services like e-learning, ecommerce and e-banking amongst others are done. The majority of the rural communities remain digitally marginalized. The advent of wireless technologies such as VSAT, WiMAX and WiFi has brought hope for the extension of digital life to the marginalized communities. A lot of financial resources are being channelled towards the setting up of satellite ICT4D projects as they set a favourable starting point for the provision of other developmental initiatives. The capital ensured by the sponsors in the developmental stages of ICT4D projects intensifies the move by many to embrace the projects. However, when these projects have been completed the ownership is transferred to the targeted users. The shortage of resources in these areas has lead to projects failure. This paper describes the conceptual design of a cost sharing and revenue management system for the Siyakhula Living Lab to help manage and generate revenue for its sustainability.
Abstract: With the advancement in technology and the
internet, the way that teaching and learning occurs is expected to follow suit.
Authors: Fred Otten (
Abstract: Audio Engineers are required to carefully plan networks based on set requirements before deploying them. They need to take into consideration the bandwidth available, the latency of audio and control data and make sure the correct number of audio channels can be transmitted. Network simulation can be used to determine the relevant bandwidth and latencies in any given scenario. It can also be used to determine optimal layouts and routes. This paper investigates the current state of network simulation for professional audio networks and presents the design of an architecture which can be used to simulate professional audio networks. It concludes that an analytical approach should be used and presents an object model which can be used to represent a professional audio network.
Authors: Georg-Christian Pranschke (
Abstract: The introduction of network filters and chokes such as firewalls in existing operational network is often problematic, due to considerations that need to be made to minimise the interruption of existent legitimate traffic. This often necessitates the time consuming manual analysis of network traffic over a period of time in order to generate and vet the rule bases to minimise disruption of legitimate flows. To improve upon this, a system facilitating network traffic analysis and firewall rule set generation is proposed. The system shall be capable to deal with the ever increasing traffic volumes and help to provide and maintain high uptimes. A high level overview of the design of the components is presented. Additions to the system are scoring metrics which may assist the administrator to optimise the rule sets for the most efficient matching of flows, based on traffic volume, frequency or packet count. A third party package - Firewall Builder - is used to target the resultant rule sets to a number of different firewall and network Filtering platforms.
Authors: Grethe Rademan (
Abstract: Wireless Sensor Networks (WSN) poses a number of design challenges. Most WSN do not follow the same methodology even though the purpose is uniform. Mobile Ad Hoc Networks (MANETs) are networks that are typified by being infrastructure-less and self-organizing. Using MANET protocols in WSN has become more common, but many changes need to be made to accommodate the low-power, low-cost and reliability needs of WSN. Re-examining the data link layer and the network layer of such networks render the best improvement on WSN needs, thus simulating and analyzing enhanced Medium Access Control (MAC) and routing strategies and adapting them to be consistent with realistic predictions and comparing strategies for the best end result.
Authors: Zelalem Shibeshi (
Abstract: The development of broadband and other communication network infrastructures together with the demand for converged services has led to the introduction of Next Generation Networks (NGN). Various efforts have been put forward to develop a standardized infrastructure to implement an NGN. One infrastructure that can be used to deliver a converged service is IMS (IP Multimedia Subsystem). On the other hand, the demand for video-oriented services from users is ever increasing and puts great pressure on Telco companies. While the infrastructure to provide these services has made considerable progress, service development has been unable to meet the demand so far. As a result, developing a toolkit to help developers create video-oriented services easily and timeously is of paramount importance. This paper discusses the progress in developing such a toolkit.
Authors: Zvabvira Shumba
Abstract: OsCommerce is one of the fastest growing ecommerce platforms. It’s gone as far as in rural areas. One of the infrastructural in rural areas like in Dwesa where this research is centered is lack of access to the Internet. In Dwesa, there is an ICT for Development intervention being undertaken, called Siyakhula Living Lab. So far only two e-commerce shops have been deployed and future plan is to migrate them osCommerce. With the proliferation of cell phones, which have features such as cameras and the ability to run java applications, there is a need to develop applications which make use of these features and support the users in some of the activities which need internet. This research looks at how mobile phones can be used to help the shop-owners to manage their shops using cell phones at home or even on the move.
Authors: Sihle Sibiya (Council for Industrial and Scientific Research)
Abstract: The emerging computing paradigm called sensor grid extends the grid computing paradigm to the sharing of sensor resources and data from wireless sensor networks in a grid network. Sensor grid promise to transform the way we interact with the physical world. However before this vision comes to reality a number of challenges have to be addressed. Quality of Service management is among those issues. This work explore grid network, wireless sensor network, sensor grid network communication challenges to design a Quality of Service (QoS) aware sensor grid communication protocol. This paper further outlines those issues and challenges that need to be address in designing a QoS-aware communication protocol for sensor grid.
Authors: Ingrid Siebörger
Abstract: Worldwide computers are being used in
schools for, amongst other things, developing the knowledge and skills required
for citizens to be able to operate within the 21st Century
Information Age. In addition, the use of cluster computers are becoming more
commonly used as a result of the increasing ease with which supercomputer
systems can be built using commodity-off-the-shelf hardware often using free
software, such as Linux and Unix operating systems and third party
applications. This work explores whether cluster thin client computer servers
can provide robust and cost effective ICT infrastructure models for use in
previously disadvantaged schools in
Authors: Patrick Tchankue
Abstract: The number of cars provided with an in-car communication system has considerably increased during the past few years. Using a mobile phone whilst driving is a safety-critical task and can cause usability issues. Speech modality has been incorporated in order to allocate hands and eyes solely to the driving task speech. This paper discusses an investigation into in-car communication systems and multimodal interfaces in order to design an in-car communication system which improves the driving experience and meets usability goals. This multimodal interface will make use of speech and manual control as input and output modalities.
Authors: Waide Tristram (
Abstract: Parallel computers have become widely available with the introduction of multicore processors, however software will need to be optimised to make use of the additional processors. A number of tools can aid the process of optimising code for parallel execution, such as parallel debuggers, profilers and parallel libraries. This paper describes an approach to evaluating the effectiveness of a selection of tools and optimisations. Additionally, an automated benchmark tool is described along with several modifications that assist in the benchmarking of optimisations. The benchmark tool has been tested and the preliminary results show an impressive increase in performance when using OpenMP.
Authors: Stefanus van der Merwe
Abstract: This work-in-progress paper briefly describes the design of a generic, low power, portable, real time processing channel sounder which can be used in the SHF (Super High Frequency), UHF (Ultra High Frequency), VHF (Very High Frequency), and HF (High Frequency) bands of communication.
Authors: Jacobus van Wyk (
Abstract: Network coding is a method that can improve the throughput of a network by combining multiple messages into one message of the same length as the original messages. Network coding can be implemented in various layers of the OSI protocol stack, but the different implementations have not been compared with one another. In this paper we propose an evaluation of selected implementations of network coding in the different layers of the OSI stack. This evaluation will be based on the throughput of a wireless ad hoc network in a simulation using OPNET.
Abstract: Phishing is a technique where an attacker gains an identity of a web user by misleading a web user to fraudulent websites. Phishing techniques combine social engineering with technology. Financial loss due to phishing has been increasing every year. There are many tools available for antiphishing; however attackers find innovative ways to bypass existing tools. In this paper we propose a unique architecture containing a basic model which addresses most of the existing phishing problems. An Intrusion Detection System (IDS) is set in place to prevent any damage from phishing sites. This architecture learns about new attacks from the IDS and modifies itself accordingly.
Abstract: At present it is very difficult to trace the identity of spammers who use identity concealment techniques. It is difficult to determine the identity of the spammer by just analysing the electronic trail. This paper proposes the design and implementation of a spammer detection system that uses honeypot techniques to detect abnormal behaviour on a network so as to identify potential spammers.