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IEEE AFRICON. 6th Africon Conference in Africa,最新文献

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Some possibilities to use an augmented Lagrange's functional in time domain decomposition 在时域分解中使用增广拉格朗日泛函的一些可能性
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146819
R. Tzoneva
{"title":"Some possibilities to use an augmented Lagrange's functional in time domain decomposition","authors":"R. Tzoneva","doi":"10.1109/AFRCON.2002.1146819","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146819","url":null,"abstract":"Some possibilities to solve by decomposition methods discrete optimal control problems characterised by non-linear model with linear control, state and control delays, state and control constraints on the basis of augmented functional of Lagrange are considered. New coordinating vector for dual decomposition is proposed. The developed decomposition method allows transformation of nonconvex problems into convex ones, preservation of the separability of their dual problems, and overcoming the difficulties in solving the non-linear two-points boundary value problems.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128333273","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
Reducing fuel consumption and CO/sub 2/ emission by properly selecting the parameters for pool heating 通过合理选择池内供热参数，降低燃料消耗和CO/sub / 2排放
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159973
S. Venkannah
{"title":"Reducing fuel consumption and CO/sub 2/ emission by properly selecting the parameters for pool heating","authors":"S. Venkannah","doi":"10.1109/AFRCON.2002.1159973","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159973","url":null,"abstract":"Traditional pool heating systems have been designed to keep the temperature water constant or within a range throughout the day without a proper knowledge of when should the heating process be started and for how long. This may not be the most efficient heating method and the cost of operation may be quite high. It is not necessary to maintain the water temperature above the minimum allowable temperature outside the operation time. This paper attempts to select a pool heating sequence based on the usage time and other parameters, which will maintain a temperature within the desired range during operation time and minimize losses. Different scenarios are considered and the optimum one is selected so as to have the desired temperature throughout the usage time. This also gives the exact time at which the boiler must be switched on to have the desired temperature for a given set of parameters. This will help in having a more efficient system and reduce the cost of operation as well as controlling the CO/sub 2/ emission.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129174433","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
Development of a gaming strategy for soccer robots using optimal methods 基于最优方法的足球机器人博弈策略研究
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146810
P. Rathaba, W. D. du Plessis, I. Craig, P. Saayman
{"title":"Development of a gaming strategy for soccer robots using optimal methods","authors":"P. Rathaba, W. D. du Plessis, I. Craig, P. Saayman","doi":"10.1109/AFRCON.2002.1146810","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146810","url":null,"abstract":"The purpose of this paper is to develop a software gaming strategy for soccer robots in the MiroSot league of the FIRA organisation. The paper describes the development of the strategy from the first principles of robot control to the implementation of a global playing strategy.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131466039","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
Parallelising calculations in electric power distribution networks 配电网中的并行计算
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160042
Y. Neumann, B. Dwolatzky
{"title":"Parallelising calculations in electric power distribution networks","authors":"Y. Neumann, B. Dwolatzky","doi":"10.1109/AFRCON.2002.1160042","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160042","url":null,"abstract":"CART (Computer Aided Reticulation of Townships) is a software package used for the design of radial, electrical power distribution networks. Having many transformers and large numbers of consumers in the distribution network significantly increases computation time. A distributed, service-based platform is being developed, with parallelisation functionality for CART as the flagship service. The system will be used to parallelise CART's voltage and current calculations for use in the design of much larger networks, possibly of metropolitan scale. Eventually, more complex scenarios will be addressed, including real-time calculation and simulation of lightning and transient faults and performance testing and optimisation of existing power distribution networks.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124119636","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
The development and testing of the bi-polar synchronous rectifier (BPSR) 双极同步整流器(BPSR)的研制与测试
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160001
J. Wheeler, B. Mortimer, I. de Vries
{"title":"The development and testing of the bi-polar synchronous rectifier (BPSR)","authors":"J. Wheeler, B. Mortimer, I. de Vries","doi":"10.1109/AFRCON.2002.1160001","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160001","url":null,"abstract":"This paper discusses the operation of the bi-polar synchronous rectifier (BPSR) a special purpose low frequency amplifier topology. Energy conversion through an output transformer is done at a frequency much higher than the desired operating waveform frequency. An active rectifier demodulates the switched waveform passing only the desired low frequency waveform to the load. This feature can lead to substantial size and weight reduction in the amplifier as transformer magnetic volume decreases with increasing frequency. The technology allows full low frequency Class-D amplifiers to be realized with comparable efficiencies, but with much higher power densities.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121314029","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
University of Stellenbosch satellite ground station operation and future plans 斯泰伦博斯大学卫星地面站运行及未来规划
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146800
R. Barry, F. Nel
{"title":"University of Stellenbosch satellite ground station operation and future plans","authors":"R. Barry, F. Nel","doi":"10.1109/AFRCON.2002.1146800","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146800","url":null,"abstract":"The purpose of this paper is to provide an overview of the past and current operations of the satellite ground station at the University of Stellenbosch. Future plans for upgrades to the station are also discussed.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128917774","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: 4
Estimating the viral load response time after HIV chemotherapy 估计HIV化疗后的病毒载量反应时间
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146809
A. M. Jeffrey, X. Xia
{"title":"Estimating the viral load response time after HIV chemotherapy","authors":"A. M. Jeffrey, X. Xia","doi":"10.1109/AFRCON.2002.1146809","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146809","url":null,"abstract":"HIV therapy is considered to be effective if it can suppress the viral load to below 50 copies per ml of plasma in less than 6 months. This response time to therapy can be estimated towards the development of an on/off control strategy for the chemotherapy of HIV as well as to aid clinicians in therapy and measurement scheduling.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129078305","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: 9
Geospatially-based software tools to support mass electrification 基于地理空间的软件工具支持大规模电气化
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160029
B. Dwolatzky
{"title":"Geospatially-based software tools to support mass electrification","authors":"B. Dwolatzky","doi":"10.1109/AFRCON.2002.1160029","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160029","url":null,"abstract":"Over the past decade tremendous progress has been made in bringing grid electricity for the first time to over 2 million homes in South Africa. Over this time a group at Wits University has carried out research leading to the development of innovative geospatial software applications to solve some of the problems faced toy the designers of these new networks. The paper overviews a number of relevant MSc and PhD projects carried out at the University over the past decade, and discusses the contribution made to electrification in South Africa.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116968099","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
High levels of noise generation in the PLC system of a long HVDC line 高压直流长线路的PLC系统产生高水平噪声
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160026
N. Moyo, N. Ijumba, A. Britten
{"title":"High levels of noise generation in the PLC system of a long HVDC line","authors":"N. Moyo, N. Ijumba, A. Britten","doi":"10.1109/AFRCON.2002.1160026","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160026","url":null,"abstract":"The operation of a long transmission line is dependent on the overall performance of the power line carrier (PLC) communications systems. Some uses of the PLC include teleprotection and network data transmission between the converter stations of the HVDC transmission system. However, high levels of noise are experienced in the PLC during the operation of the HVDC system. This paper investigates the phenomena that leads to the high levels of noise in the PLC systems of long HVDC lines and also describes the methodology used in investigating this phenomena.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115391012","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
A hardware emulator testbed for software defined radio 软件无线电硬件仿真试验台
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146867
J. Witkowsky, G. van Rooyen
{"title":"A hardware emulator testbed for software defined radio","authors":"J. Witkowsky, G. van Rooyen","doi":"10.1109/AFRCON.2002.1146867","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146867","url":null,"abstract":"In software defined radio (SDR), most of the traditionally analogue signal processing, synthesis and analysis functions of a communications system are performed digitally. However, critical hardware system components (such as analogue-digital-analogue conversion) still remain, making the full system design and testing more cumbersome. This paper presents an introductory overview on SDR and work-in-progress concerning the background and design considerations for a basic SDR hardware emulator. Hardware emulation allows fast and low-cost evaluation of possible hardware architectures. An object-orientated software design approach is taken, and the technical issues surrounding the development of hardware models are considered. Finally, a proposed system software architecture is presented.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115158954","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: 6
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