Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)最新文献

{"title":"Synchronization of chaotic flows with variable nonlinear hyperbolic functions via hybrid feedback control","authors":"E. Umoh","doi":"10.1109/SCAT.2014.7055126","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055126","url":null,"abstract":"The YU-WANG autonomous chaotic system is a three-dimensional system that possesses a quadratic cross-product and a hyperbolic nonlinear term in its system equations. The resulting complex dynamics formed by these nonlinearities can be manipulated to evolve two- and four-wing attractors which form intricate attractors with distinct dynamic properties. This paper presents the synchronization of the system with identical and non-identical hyperbolic nonlinear terms using hybrid feedback control techniques. The results of the various simulations show that the coupled systems are mildly susceptible to varying hyperbolic nonlinearities using the synchronization scheme. However, the folding trajectories are highly sensitive to parametric perturbation in the controller-deactivated architecture of the original system.. The synchronized signals holding possibilities of applications in secure communication system modelling and design.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122721879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Road map towards eco-efficient cloud computing adoption in higher learning institutions in Tanzania","authors":"Rodrick Mero, J. Mwangoka","doi":"10.1109/SCAT.2014.7055151","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055151","url":null,"abstract":"Cloud computing has been trusted in academic environment. Despite the flexibility and cost effective services offered by cloud computing, none of the higher learning institutions in Tanzania (HLIT) has jumped onto the bandwagon. HLIT use traditional computing (TC) that has been proved uneconomical in terms of maintenance and software purchase costs. It is important for HLIT to leverage the low operation costs and flexibility of ICT services offered by cloud computing. The adoption of cloud computing in HLIT need to be examined from the benefits and limitations points of view. Clear adoption stages should be followed to ensure cloud computing services reflect institution's policy and strategy. This work explores TC environment in HLIT towards cloud computing adoption and hence proposes necessary stages for HLIT to move into cloud.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124368692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of new crosstalk multiple access systems for inductive communication systems","authors":"J. Agbinya","doi":"10.1109/SCAT.2014.7055124","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055124","url":null,"abstract":"Crosstalk is a major concern which impacts the performance of inductive systems including wireless power transfer, inductive communication systems and embedded inductive powering of biomedical devices. In this paper we seek to show that crosstalk can be either an incentive or a disadvantage if it is not harnessed properly. Therefore we propose as a major contribution a new multiple access system based on crosstalk, the new crosstalk multi-access system (CMAS) for inductive communication channels. To achieve CMAS multiple-input-multiple-output (MIMO) communication is used. Mutual coupling channels are designed to use block coding to identify system nodes and to also decouple the multi-channel responses into orthogonal sources. This provides crosstalk diversity at the receivers. A receiver is able to assemble multiple received signals from multiple sources, eliminating inductive co-channel interference thereby increasing the system signal-to-noise ratio (SNR) and overall system capacity.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132806422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional network monitoring system using SMS","authors":"A. Kijazi, Michael Kisangiri","doi":"10.1109/SCAT.2014.7055149","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055149","url":null,"abstract":"Network monitoring is very important for the reliable operation of any network, monitoring is not only concerned with the monitoring of its performance and availability, but also monitoring of network operating environment, because they are both contributing to the reliable operated network. For the effective network monitoring, it is better for Network administrators being intact with both instant network operations as well as different hazards such as fire, water, humidity, power fluctuation and temperature even if they are not physically present in the network operation room. The objective of this paper is to provide an efficient remote Local area Network (LAN) monitoring, mainly focusing on Server room devices and its environment sensors for network administrators.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116346484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deployment of wireless sensor networks (WSN) in automated irrigation management and scheduling systems: a review","authors":"J. Haule, Kisangiri Michael","doi":"10.1109/SCAT.2014.7055144","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055144","url":null,"abstract":"Wireless sensor networks (WSN) is an important and exciting technology with great potential for application in various fields including medicine, transportation, agriculture, industrial process control, global-scale environmental monitoring and precision agriculture. This paper reviews the application of WSN in automating irrigation management and rescheduling. Irrigation management and rescheduling based on WSN are potential solutions for optimum water management via automatic access to in-field soil moisture conditions and control of irrigation systems.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"058 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130934562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-cost tuning of Fuzzy Controllers in a chaotic system stabilization problem","authors":"E. Umoh","doi":"10.1109/SCAT.2014.7055127","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055127","url":null,"abstract":"A heuristic tuning of a Fuzzy Controller to examine the limits of gains that assures a unique control law for stabilization of a Rucklidge chaotic system is presented in this paper. The Rucklidge system is one of the paradigms of chaos that holds possibilities of applications in secure communication schemes and electrical power distribution systems where two identical or hybrid systems can be antisynchronized or synchronized for signal masking over public channels and power outage minimization and control. In this work, a low-cost and less rigorous fuzzy controller tuning strategy is presented where the controller output gain coefficients are tuned within a given bounds to produce unique solutions with better settling times in the context of state vectors stabilization problems. The strategy is less tedious when compared to other tuning methods used for controllers in some chaotic and non-chaotic systems. The approach has been validated on other chaotic systems to be robust for a class of chaotic system control.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133660296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive carrier frequency synchronization using virtual subcarriers in OFDM systems","authors":"Kwame Ibwe, H. Kundaeli","doi":"10.1109/SCAT.2014.7055143","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055143","url":null,"abstract":"The inherent immunity of OFDM to multipath limitations comes with the price of increased sensitivity to inaccuracies in the reference frequency. A carrier offset at the OFDM receiver causes losses in subcarrier orthogonality, and thus introduces inter-channel interference (ICI) which degrades the system performance. In mobile communication technology, adaptive algorithms are mostly chosen in real time signal processing because of their high speed to acquire and track changes in parameters. Unfortunately, the existing adaptive methods are not suitable in doubly selective fading channels. In this paper, an adaptive carrier frequency synchronization algorithm is proposed for applications under double dispersive fading channels. The algorithm takes advantage of the known structure of the subspace of OFDM signals. It is shown that the mean square errors of frequency offset estimates are much lower than those of existing adaptive and some non-adaptive algorithms. Simulations also show that it takes only one symbol for the proposed algorithm to track the changes in the channel, leading to high accuracy in the compensation. Since no matrix inversion is involved in the algorithm, excellent transient behaviors with very low complexity are obtained. The proposed algorithm is robust and outperforms the existing adaptive algorithms particularly in doubly dispersive channels.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134366460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring and evaluation of the e-readers project in rural Tanzania","authors":"D. Machuve, I. Zlotnikova, D. Nyambo","doi":"10.1109/SCAT.2014.7055138","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055138","url":null,"abstract":"This study provides recommendations on the monitoring and evaluation conducted for an ICT in Education project in two rural primary schools in Tanzania. The objective of the study was to evaluate the effectiveness of e-readers introduction at the schools. The e-readers introduction aimed at complementing the traditional print books. Print books are insufficient in primary schools in Tanzania; this ultimately leads to lack of reading skills in pupils and poor overall academic performance. As a conceptual framework the study adopted the InfoDev Monitoring and Evaluation framework for ICT in Education projects and adjusted it to local conditions. The study has shown that pupils at both schools considerably improved their reading skills as a result of the e-readers introduction. The introduction of e-readers also resulted in teachers and pupils being more motivated and engaged in learning. Survey results for parents demonstrate readiness on cost-sharing for acquiring the devices. This also indicates the feasibility of up-scaling the project to other schools in the country.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132033975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementing wireless network performance optimization for Small and Medium Enterprises","authors":"Topside E. Mathonsi, Okuthe P. Kogeda","doi":"10.1109/SCAT.2014.7055139","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055139","url":null,"abstract":"There is a high growth rate in number of Small and Medium Enterprises (SMEs) in South Africa and the role they play in the growth of South African economy is very vital. These organizations set up networks to ease communication and share resources. However, due to rapid growth in most of the SMEs, they face network performance limitations including high link congestion, intermediate node loss, high end-to-end delay and poor Quality of Service (QoS). These limitations lead to poor network performance, because a more reliable path is not selected before packet transmission starts and the available bandwidth is properly allocated between communicating users. In this paper, we designed and implemented an enhanced bandwidth sharing scheme by integrating cooperative game theory, multiple routing metrics and standard-Dijkstra algorithm, in order to reduce link congestion, end-to-end delay and minimize number of packets lost during transmission. The enhanced bandwidth sharing scheme first select a more reliable path then allocate the available bandwidth between communicating users based on the packet size they want to send at a particular time. The Network Simulator 2 (NS2) simulation results showed that the enhanced bandwidth sharing scheme produced the desired QoS and there is high bandwidth utilization. It also reduced link congestion, end-to-end delay and minimized number of packets lost at various packet sizes.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127805655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scale factor considerations for SDF technique","authors":"Thanh T. Nguyen, J. Devlin, D. Elton, E. Custovic, B. Bienvenu","doi":"10.1109/SCAT.2014.7055121","DOIUrl":"https://doi.org/10.1109/SCAT.2014.7055121","url":null,"abstract":"The Tasman International Geospace Environment Radars (TIGER) form part of an international network of similar HF radars called Super Dual Auroral Radar Network (SuperDARN) which explore the impact of solar disturbances on Earth. These radars utilise an Auto Correlation Function (ACF) to measure the changing phase of the ACF between lag times to determine the Doppler frequency and the target velocity.With the development of TIGER-3, an all digital radar platform, a novel method of determining target velocities has been proposed. In the proposed methoThe Tasman International Geospace Environment Radars (TIGER) form part of an international network of similar HF radars called Super Dual Auroral Radar Network (SuperDARN) which explore the impact of solar disturbances on Earth. These radars utilise an Auto Correlation Function (ACF) to measure the changing phase of the ACF between lag times to determine the Doppler frequency and the target velocity.With the development of TIGER-3, an all digital radar platform, a novel method of determining target velocities has been proposed. In the proposed method, a comparison of the transmit and receive signal magnitude spectrums is performed to determine the Spectrum Difference Function (SDF). The gradient of SDF in the vicinity of the carrier frequency is calculated, from this value the Doppler Frequency Shift fd can be deduced. The result is then multiplied by a precalculated Scale Factor which is necessary to compensate for the systematic error due to the method. This paper will address all the factors which have influence on the value of Scale Factor, therefore minimize the error associated with the process of calculating Scale Factor.d, a comparison of the transmit and receive signal magnitude spectrums is performed to determine the Spectrum Difference Function (SDF). The gradient of SDF in the vicinity of the carrier frequency is calculated, from this value the Doppler Frequency Shift fd can be deduced. The result is then multiplied by a precalculated Scale Factor which is necessary to compensate for the systematic error due to the method. This paper will address all the factors which have influence on the value of Scale Factor, therefore minimize the error associated with the process of calculating Scale Factor.","PeriodicalId":315622,"journal":{"name":"Proceedings of the 2nd Pan African International Conference on Science, Computing and Telecommunications (PACT 2014)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116974229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}