发布求助
文献互助 智能选刊 最新文献

AFRICON 2007最新文献

筛选
英文 中文
An efficient grid placing technique for 2-D method of moments analysis of coupled line structures 一种用于耦合线结构二维矩分析方法的网格放置技术
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401509
D. D. De Villiers, P. Meyer
{"title":"An efficient grid placing technique for 2-D method of moments analysis of coupled line structures","authors":"D. D. De Villiers, P. Meyer","doi":"10.1109/AFRCON.2007.4401509","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401509","url":null,"abstract":"In this paper an analysis routine is presented for a two dimensional method of moments analysis of coupled line structures to find the capacitance matrix. A method is proposed to significantly reduce the number of unknowns. The method borrows from physical optics to predict electrical 'shadows' where the charge density is negligible and can be ignored. This new method is implemented, and a significant improvement in analysis time is achieved with very little loss of accuracy. The analysis routine is used in an optimization loop to synthesize an interdigital filter which displays excellent performance.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123286416","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
Best switching time of hot water cylinder-switched optimal control approach 热水缸切换最佳时间的最优控制方法
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401505
Jiangfeng Zhang, X. Xia
{"title":"Best switching time of hot water cylinder-switched optimal control approach","authors":"Jiangfeng Zhang, X. Xia","doi":"10.1109/AFRCON.2007.4401505","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401505","url":null,"abstract":"The problem to find the best switching time of a hot water cylinder is considered in this paper. A switched optimal control model for the cost of hot water cylinder is given. The standby heat loss of the cylinder as well as the discomfort level are included in the model. Based on the information of time-of- use electricity tariff, a consumer is able to know when to switch on and off the hot water cylinder so that both the electricity cost and the discomfort level are minimized. A case study shows the effectiveness of the proposed method.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122321182","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: 29
The UMTS business case in emerging markets economic considerations of network upgrade 新兴市场中UMTS商业案例对网络升级的经济考虑
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401635
T. Frisanco
{"title":"The UMTS business case in emerging markets economic considerations of network upgrade","authors":"T. Frisanco","doi":"10.1109/AFRCON.2007.4401635","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401635","url":null,"abstract":"With universal mobile telecommunications system (UMTS) technology reaching maturity stage, current third generation (3G) mobile network deployment increasingly spreads to developing, \"follower\" markets; at the same time, technical feasibility issues are gradually replaced by economic considerations. We introduce a technology migration model explaining end-user market behaviour, and propose a modular, structured business modeling approach to simulate the economic impacts of an operator's go/no-go decision regarding new technology network roll-out. Our model is illustrated by applying it to a realistic case based on an emering-market incumbent operator.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130298561","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
Artificial intelligence as an aide in management of security technology 人工智能作为安全技术管理的助手
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401470
S. M. Dhlamini, M. Kachienga, T. Marwala
{"title":"Artificial intelligence as an aide in management of security technology","authors":"S. M. Dhlamini, M. Kachienga, T. Marwala","doi":"10.1109/AFRCON.2007.4401470","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401470","url":null,"abstract":"Historically, artificial intelligence (AI) research draws inspiration from human cognition, seeking to produce similarly intelligent behavior in artificial systems. Repetitive learning is the most important part of artificial intelligence. The South African electronic security industry is very data intensive, able to produce 1000 000 events per day and more than 1000 GB of video and voice data per day at a site. Many research and development groups in the security industry are looking extensively at AI to assist human operators to isolate important information from the avalanche of data. The selling potential systems resides in new AI based products and systems that can provide human-like sensibilities and reasoning. This paper gives an overview of existing and potential applications of AI in the security industry in South Africa. The paper highlights the value-adding potential of AI as a management tool to security systems.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131175690","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
Measuring SET effects in a CMOS operational amplifier using a built-in detector 使用内置检测器测量CMOS运算放大器中的SET效应
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401472
J. M. Espinosa-Duran, Jaime Velasco-Medina, G. Huertas, R. Velasco, J. Huertas
{"title":"Measuring SET effects in a CMOS operational amplifier using a built-in detector","authors":"J. M. Espinosa-Duran, Jaime Velasco-Medina, G. Huertas, R. Velasco, J. Huertas","doi":"10.1109/AFRCON.2007.4401472","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401472","url":null,"abstract":"This paper studies the effects produced by radiation single event transient (SET) injected in the transistors of a custom operational amplifier, in order to evaluate their sensitivity to the radiation transient faults. A BID (built-in detector), was included in the circuit in order to amplify and detect the SETs effect. The circuit was designed using a non-rad- hard AMS-CMOS 0.8 mum process. In this case, simulation results allow the identification of the operational amplifier most sensitive transistors and the operating conditions during which the worst effects in the operational amplifier response were produced.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"37 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131224067","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
Inaccuracies when mixing coordinate reference frameworks in a system of systems simulation 在系统仿真系统中混合坐标参考框架时的不准确性
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401573
B. Duvenhage, J. Nel
{"title":"Inaccuracies when mixing coordinate reference frameworks in a system of systems simulation","authors":"B. Duvenhage, J. Nel","doi":"10.1109/AFRCON.2007.4401573","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401573","url":null,"abstract":"The modelling of military systems of systems invariably involves the incorporation of existing, often shared, models into larger and more complex simulations. The sharing of models between simulations has long been the goal of the simulation community and although the resulting simulations expand the application domain of the models it comes at a cost. In this paper the authors highlight one of the issues faced, namely the use of different coordinate frameworks on performance and quantifies the errors that could be introduced into the simulation. It starts by providing an overview of the most commonly used coordinate frameworks and then elaborates on some of the experiences gained through its application in the Virtual Ground Based Air Defence System (GBADS) simulator. The focus is on the mixing of flat earth convention and spherical earth convention. The authors conclude with further motivation why a common earth reference model should be used for all simulation entities and, more importantly, why it should be a \"real world\" earth reference model.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134091961","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
Models and control methodologies in open water flow dynamics: A survey 开放水域流动动力学的模型和控制方法:综述
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401525
X. Zhuan, X. Xia
{"title":"Models and control methodologies in open water flow dynamics: A survey","authors":"X. Zhuan, X. Xia","doi":"10.1109/AFRCON.2007.4401525","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401525","url":null,"abstract":"The open water flow models in control design are reviewed as well as the control methodologies. Traditionally, the open flow dynamics are described by Saint Venant equations, two coupled partial differential equations. Dicretization and linearization approaches are proceeded on the equations with some assumptions and the resulted simple models are employed for control design. The difficulty in determination of the parameters in Saint Venant equations remains in the simplified models. Recently, some data-driving models are proposed for flow dynamics control. In these models, the parameters are identified with real data. Based on these models, two kinds of control techniques: optimal control and PI control are the most popular.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133660443","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: 23
High-bandwidth NMR teslameter 高带宽核磁共振分光计
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401476
J. Taylor, H. du Mouton, T. Jones
{"title":"High-bandwidth NMR teslameter","authors":"J. Taylor, H. du Mouton, T. Jones","doi":"10.1109/AFRCON.2007.4401476","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401476","url":null,"abstract":"This paper proposes a new NMR measurement technique that promises high bandwidth (> 10 kHz) and high follow-capability (> 10 T-1s-1). The theory of NMR is briefly explained, along with traditional continuous wave and pulsed NMR measurement techniques. This paper then continues to explain the principle behind the new measurement technique. It also provides simulation results and hardware considerations.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114288650","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 detailed analysis of the effect of dead time on harmonic distortion in a class D audio amplifier 详细分析了死区时间对D类音频放大器谐波失真的影响
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401640
F. Koeslag, H. du Mouton, H. J. Beukes, P. Midya
{"title":"A detailed analysis of the effect of dead time on harmonic distortion in a class D audio amplifier","authors":"F. Koeslag, H. du Mouton, H. J. Beukes, P. Midya","doi":"10.1109/AFRCON.2007.4401640","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401640","url":null,"abstract":"This paper presents an analytical method for determining the effect of dead time on harmonic distortion in a class D audio amplifier. The analysis is based on the well established double Fourier series, providing accurate analytical solutions to the pulse width modulated spectra under natural sampling. The proposed analytical model differs from that of previous work in the sense that the precise contribution of each separate component can be determined, i.e. the fundamental component, baseband, carrier and sideband harmonics.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131921098","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: 18
A holistic test procedure for security systems software: An experience report 安全系统软件的整体测试程序:经验报告
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401471
S. M. Dhlamini, T. Mwakabaga, M. Kachienga
{"title":"A holistic test procedure for security systems software: An experience report","authors":"S. M. Dhlamini, T. Mwakabaga, M. Kachienga","doi":"10.1109/AFRCON.2007.4401471","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401471","url":null,"abstract":"This paper presents a comprehensive holistic software test procedure for security systems applications. The method evaluates the functional requirements of a security system. Based on the functional requirements and the hardware solution that satisfies the requirements, a test procedure was developed. The test procedure evaluates the correctness, robustness, efficiency, portability, integrity, verifiability and validation and ease of use. An impact assessment is done to assess the cost effectiveness, compatibility and reusability of the software with existing hardware. The study found that the impact of software on the business process is the most important test for any new software prior to deployment.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130595382","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信