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Implementation and verification of a cloud-based machine-to-machine data management system 基于云的机器对机器数据管理系统的实现和验证
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757739
P. Jordaan, Johann E. W. Holm
{"title":"Implementation and verification of a cloud-based machine-to-machine data management system","authors":"P. Jordaan, Johann E. W. Holm","doi":"10.1109/AFRCON.2013.6757739","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757739","url":null,"abstract":"Cloud-computing has recently become a popular alternative to traditional physical server application development and deployment. This is largely due to the inherent scalability and flexibility that cloud infrastructure provides. A cloud-design paradigm demands good programming practice that results in maintainable and performant code. A machine-to-machine (M2M) data management system was implemented on a cloud and verified for functional capability and performance. Empirical results show that excellent performance can be expected when the server is hosted on a commercial cloud infrastructure, providing sufficient evidence that a cloud implementation is a viable framework for actual M2M applications.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"27 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113977426","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}
引用次数: 1
Birefringence and polarization fluctuations as a result of optical fibre bending during scanning of a KAT-7 riser cable KAT-7提升管电缆扫描过程中光纤弯曲引起的双折射和偏振波动
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757846
H. Kourouma, E. Rotich, R. Gamatham, A. Leitch, T. Gibbon, R. Siebrits, R. Julie, F. Kapp
{"title":"Birefringence and polarization fluctuations as a result of optical fibre bending during scanning of a KAT-7 riser cable","authors":"H. Kourouma, E. Rotich, R. Gamatham, A. Leitch, T. Gibbon, R. Siebrits, R. Julie, F. Kapp","doi":"10.1109/AFRCON.2013.6757846","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757846","url":null,"abstract":"We evaluate the effects of optical fibre bending on polarization mode dispersion (PMD) and states of polarization (SOP) for a KAT-7 dish antenna riser cable. The antenna riser cable is the optical cable extending from the pedestal to the focus of the antenna. The riser cable for each antenna is subjected to environmental variations and to any physical variation caused by the motion of the fibre while the antenna is being scanned. To emulate this, we have investigated the effects of optical fibre bending with a riser cable inserted in a bending jig built to simulate antenna scanning movements. Measurements have shown that Differential Group Delay (DGD) values remain below 10 fs in the loop back configuration and below 6fs in the straight through configuration of the optical fibre placement in the bending jig. For the purpose of this paper, PMD and SOP measurements were made with a single varying element being the amount of bending enforced onto the optical fibres under test.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"12 26","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131505440","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}
引用次数: 0
Improved high bandwidth current controller for FPGA based inverter drives 基于FPGA的逆变器驱动的改进高带宽电流控制器
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757792
F. Senicar, A. Bartsch, Karsten Klitzke, S. Soter
{"title":"Improved high bandwidth current controller for FPGA based inverter drives","authors":"F. Senicar, A. Bartsch, Karsten Klitzke, S. Soter","doi":"10.1109/AFRCON.2013.6757792","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757792","url":null,"abstract":"This paper presents the improvement of the precision and bandwidth of the current control loop implemented in a field programmable gate array (FPGA) based inverter. By compensating the nonlinear effects of the IGBT power stage with a feed forward control, the current controller is relieved resulting in an output current with less harmonics and a better frequency response. In order to improve the current control loop even further, a current observer, based on a Luenberger observer is implemented.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"514 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133158413","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}
引用次数: 2
Readiness of mathematics' educators to incorporate ICT as a teaching tool in Mauritius 毛里求斯的数学教育工作者是否愿意将信息通信技术作为一种教学工具
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757764
P. Appavoo, K. Soyjaudah, V. Armoogum
{"title":"Readiness of mathematics' educators to incorporate ICT as a teaching tool in Mauritius","authors":"P. Appavoo, K. Soyjaudah, V. Armoogum","doi":"10.1109/AFRCON.2013.6757764","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757764","url":null,"abstract":"Information and Communications Technology (ICT) is opening avenues for disseminating content in innovative and effective manners to learners. The overarching construct namely technology, pedagogy and the digital content are key elements for the successful integration of ICT in school settings. In this paper we investigate pedagogy and more precisely the readiness of educators to adopt technology in their teaching. A questionnaire was administered to 118 mathematics educators working in 95 secondary schools. The results reveal that mathematics educators in Mauritius are regular users of computers at home and are much willing to integrate this tool in their teaching process if a conducive environment is provided in the schools, including facilities, training and motivation. Furthermore educators strongly perceived ICT affordances for learning benefits and believed that students can learn mathematics better with ICT tools.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133280621","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}
引用次数: 1
Image recovery by 2-D Least Mean Square adaptive method 二维最小均方自适应图像恢复方法
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757666
P. Manyere, A. L. Nel
{"title":"Image recovery by 2-D Least Mean Square adaptive method","authors":"P. Manyere, A. L. Nel","doi":"10.1109/AFRCON.2013.6757666","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757666","url":null,"abstract":"The success of information gathering using images depends on the ability of the gathering device to eliminate noise. The majority of third world countries rely on under slung aircraft cameras to gather information, because of their inability to afford satellites. The camera such as Vinten, can take detailed pictures from an altitude of about 1000 m. Use of such airborne cameras result in long processing time, loss of important information during processing, causing poor quality images. To address these challenges, this paper developed software that is capable of restoring damaged or poor quality images for ease and quick interpretation. The 2-D Least Mean Square (LMS) adaptive algorithm was implemented using MATLAB to restore damaged images. The results showed an improvement by line enhancement on the degraded images. The 2-D adaptive algorithm improved quality of degraded images. A further analysis of the damaged and restored images showed an associated shift in frequency response and the loss in the intensity magnitude of the image.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133972925","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}
引用次数: 0
A 3:1 bandwidth planar, lossless cavity backed sinuous antenna for reflector feed applications 一个3:1带宽平面，无损腔背正弦天线的反射馈电应用
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757855
Ngoy Mutonkole, D. Villiers
{"title":"A 3:1 bandwidth planar, lossless cavity backed sinuous antenna for reflector feed applications","authors":"Ngoy Mutonkole, D. Villiers","doi":"10.1109/AFRCON.2013.6757855","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757855","url":null,"abstract":"An ultra-wideband, dual polarized printed cavity backed sinuous antenna with a 3:1 matched bandwidth ratio is presented. The antenna is characterised as a feed for a prime focus paraboloid reflector and as a feed in an offset Gregorian configuration. A parameter study is performed using full wave simulations, and the effects of, and bounds on the main design parameters are described. A prototype antenna is designed, with a simulated aperture efficiency of about 58% for an offset Gregorian reflector antenna, whilst having a measured return loss of 10 dB or better over a 3:1 bandwidth.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115213333","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}
引用次数: 5
System architecture for ubiquitous live video streaming in university network environment 高校网络环境下无处不在的视频直播系统架构
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757639
Angeline G. Dludla, Mncedisi J. Bembe, Badamsuren Byambaakhuu, M. Abdulai, J. Rho
{"title":"System architecture for ubiquitous live video streaming in university network environment","authors":"Angeline G. Dludla, Mncedisi J. Bembe, Badamsuren Byambaakhuu, M. Abdulai, J. Rho","doi":"10.1109/AFRCON.2013.6757639","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757639","url":null,"abstract":"The recent growth of ubiquitous computing brings to the networking discipline new classes of home, campus, and mobile networks. This would enable education service providers to provide services to learners anywhere, anytime and not only through fixed devices, but also through ubiquitous mobile end user devices. Realizing these capabilities would require an architecture which supports context awareness functionality and an understanding of the environment by the system. In this paper we present an architecture which supports ubiquitous live streaming for university or campus networks using a modified bluetooth inquiry mechanism with extended ID, integrated end-user device usage and adaptation to heterogeneous networks. Riding on that architecture, services that can be provided by the education service provider include but not limited to live video streaming, e-document delivery and virtual notice boards. For the ubiquitous live streaming, mobile end user devices play the master or coordination role to identify which end-user device from a pool of devices the streaming should be sent to. The remaining components work together to ensure context awareness, flexibility and much more reliability of the system.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117063412","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}
引用次数: 3
A compact and efficient SAT encoding for quantum circuits 一种用于量子电路的紧凑高效的SAT编码
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757630
R. Wille, Nils Przigoda, R. Drechsler
{"title":"A compact and efficient SAT encoding for quantum circuits","authors":"R. Wille, Nils Przigoda, R. Drechsler","doi":"10.1109/AFRCON.2013.6757630","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757630","url":null,"abstract":"Promising applications of quantum computation motivated the consideration of corresponding design methods for this emerging technology. Here, researchers are faced with the problem that signals in quantum circuits may (theoretically) assume an infinite number of states. As a consequence, design approaches based on Boolean satisfiability (SAT) were subject to restrictions so far. In this work, we propose a compact and efficient SAT encoding for quantum circuits that loses these restrictions. For this purpose, a structural analysis is introduced which determines an upper bound on possible quantum states. The applicability of the encoding is exemplarily demonstrated by a SAT-based equivalence checker.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291507","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}
引用次数: 13
Computation of the mutual inductance between circular filaments with coil misalignment 线圈不对中时圆丝间互感的计算
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757626
Anele O. Amos, Ykandar Hamam, Y. Alayli, Karim D Djouani
{"title":"Computation of the mutual inductance between circular filaments with coil misalignment","authors":"Anele O. Amos, Ykandar Hamam, Y. Alayli, Karim D Djouani","doi":"10.1109/AFRCON.2013.6757626","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757626","url":null,"abstract":"Although electric vehicles (EV) are a favoured solution for a greener energy, they require sufficient battery storage on board in order to provide sufficient driving autonomy. Plug-in connectors have been commonly proposed for EV battery charging. However, these are inherently unsafe due to the exposed electrical terminals. Contactless inductive power transfer (CIPT) systems provide a modern technology suitable for wireless transfer of electric power for EV battery charging. However, coil misalignment is its inherent problem since the mutual inductance depends on the shapes and orientations of the two coils in the CIPT transformer. In this paper the authors analyse the impact of coil misalignment on the mutual inductance between circular filaments. This investigation is achieved by computing relevant and advanced models formulated in the literature for computing circular filaments with coil misalignments. Detailed results obtained using SCILAB application software are given.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124769924","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}
引用次数: 10
LDPC coded adaptive multiresolution modulation for Unequal Error Protection 不等错误保护的LDPC编码自适应多分辨率调制
2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757766
B. Rajkumarsingh, K. Nuckchady
{"title":"LDPC coded adaptive multiresolution modulation for Unequal Error Protection","authors":"B. Rajkumarsingh, K. Nuckchady","doi":"10.1109/AFRCON.2013.6757766","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757766","url":null,"abstract":"Wireless Communications system in the coming future will need to support a large amount of services, each with a different Quality of Service (QOS). This paper proposes a system model which uses Adaptive Multiresolution Modulation (AMM) of 16, 64 and 256 Quadrature Amplitude Modulation (QAM) along with Low Density Parity Check (LDPC) codes of different code rates as a Forward Error Correcting (FEC) code to provide UEP for the heterogeneous traffic and also for maintaining the (QOS) of the different services at the desired level. Comparing with previous works, the difference with the proposed system is that channel coding is accounted while determining the shape of QAM at which the system performs best. Also, a multiresolution modulation is designed which does not degrade the performance of the least important message as that of the most important one is increased. A BER performance gain of 36.6 dB arises for the high priority message with the proposed scheme when compared to a fixed modulation scheme with the same coding used.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123407091","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}
引用次数: 1
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