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AFRICON 2009最新文献

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“How can one increase skills and build a new generation of potential managers at a large ICT company?” “在一家大型信息通信技术公司，如何提高技能，培养新一代潜在的管理人员?”
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308135
R. van Olst, Matimba Mbungela
{"title":"“How can one increase skills and build a new generation of potential managers at a large ICT company?”","authors":"R. van Olst, Matimba Mbungela","doi":"10.1109/AFRCON.2009.5308135","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308135","url":null,"abstract":"This paper describes a training programme developed by Wits University, Johannesburg, South Africa, for a large mobile operator company which is committed to the development of its in-house employees to become future leaders in the company. Most of these employees are under the age of 30 years and would be described as “Generation Y” category people. The paper covers some of the challenges of doing in-house technical and business training to such employees.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115275686","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 low-cost electric power wheelchair with manual and vision-based control systems 一种低成本的电动轮椅，带有手动和基于视觉的控制系统
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308554
Benjamin Romero, Abraham Camacho, J. Varona, Carlos Delgado, R. Velázquez
{"title":"A low-cost electric power wheelchair with manual and vision-based control systems","authors":"Benjamin Romero, Abraham Camacho, J. Varona, Carlos Delgado, R. Velázquez","doi":"10.1109/AFRCON.2009.5308554","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308554","url":null,"abstract":"This paper presents the design, implementation and experimental platform of a low-cost intelligent wheelchair for the motor-disabled. The first prototype developed is an electric power wheelchair which cost is one third of the commercially available ones and is capable of both manual and autonomous operation. Manual operation relies on a joystick and is intended for people that, in spite of their disability, are well capable of maneuvering the wheelchair. Autonomous operation relies on a mobile robotics inspired computer vision system to navigate through corridors, halls, indoors/outdoors, among other structured environments and is indented for the severely impaired, such as the tetraplegics. Besides from being an affordable-to-everyone device, its current application is museum guidance: based on a location-aware interactive storytelling platform, the wheelchair guides the user among the museum's rooms while providing audio information.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114585550","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: 16
The application of fuzzy logic for the solving of conflicts in the dispositional tasks of a railway traffic control center 模糊逻辑在铁路交通控制中心调度任务冲突解决中的应用
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308167
T. Héray, G. Rozsa, L. Kóczy, Istvan Tompe
{"title":"The application of fuzzy logic for the solving of conflicts in the dispositional tasks of a railway traffic control center","authors":"T. Héray, G. Rozsa, L. Kóczy, Istvan Tompe","doi":"10.1109/AFRCON.2009.5308167","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308167","url":null,"abstract":"The paper considers a railway timetable related problem in a simplified form, generated by the delay of one or several incoming trains at a given station. Usually there are connecting trains in the timetable, especially in up to date periodic timetables and thus incoming delays might indicate the necessity of introducing a delay with connecting outgoing trains. A hierarchical fuzzy rule base is applied in order to determine the optimal outgoing delay, taking also usual restrictions into consideration. Three examples are shown.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115644543","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
Efficient and scalable charging systems for IP multimedia networks IP多媒体网络的高效可扩展收费系统
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308326
Vitalis G. Ozianyi, N. Ventura
{"title":"Efficient and scalable charging systems for IP multimedia networks","authors":"Vitalis G. Ozianyi, N. Ventura","doi":"10.1109/AFRCON.2009.5308326","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308326","url":null,"abstract":"The advent of IP communications challenged the use of legacy charging methods. Moreover, the diversity of Internet applications complicates the deployment of charging schemes in converged networks. Charging requires the collection of accounting information of resource usage, a process that consumes system resources that are needed for service delivery. Flat rate charging is popular on the Internet; it is associated with best-effort transport of traffic. Through QoS provisioning, operators can differentiate the treatment of different applications, to meet application requirements and diverse user preferences. Usage and QoS based charging is used with QoS provisioning schemes. Scalable accounting for multimedia service provisioning requires management planning to utilize simpler accounting mechanisms that cater for the QoS levels, data volumes and duration of usage. In this paper we explore mechanisms for achieving scalable charging for IP based multimedia communications. We present charging performance results from an IMS testbed based on the UCT SDP.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124754539","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
Low-frequency noise measurement of a highly stable charge-meter 一种高稳定电荷计的低频噪声测量
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308334
S. Nihtianov, Xiaodong Guo
{"title":"Low-frequency noise measurement of a highly stable charge-meter","authors":"S. Nihtianov, Xiaodong Guo","doi":"10.1109/AFRCON.2009.5308334","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308334","url":null,"abstract":"A successful effort is reported on an accurate measurement of the low-frequency (1/f) noise and the thermal stability of the charge-meter presented in [1]. These two parameters are very important for the charge-meter, as its main application is to interface capacitive sensors with extremely high long-term stability and low thermal drift.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128676293","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
Optimization of radio frequency usage: A case study of Ondo State Television broadcast Nigeria 无线电频率使用的优化:以尼日利亚Ondo国家电视台为例
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308110
B. Abe, T. Marwala, Adebisi Adeloye, A. Jimoh
{"title":"Optimization of radio frequency usage: A case study of Ondo State Television broadcast Nigeria","authors":"B. Abe, T. Marwala, Adebisi Adeloye, A. Jimoh","doi":"10.1109/AFRCON.2009.5308110","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308110","url":null,"abstract":"With a dedicated frequency, whose spectrum is to spread uniformly over Ondo State, this study ascertains the achievement of this aim considering the irregular terrain and topology of the state. The work highlights the use of translators to compensate intended area not adequately covered by the dedicated spectrum and specified antennas whose radiation patterns match the irregular geophysical terrain between the transmitter and the scattered receivers within the state. The management of the frequency spectrum utilized by Ondo State Television to cover the irregular terrain of Ondo State is used as a case study. The study involved field strength measurement of the television reception at various randomly selected locations within the state to enhance frequency spectrum management that will ensure an optimum utilization of the dedicated spectrum within the irregular environment. The study proffers solution to radio spectrum management problems in other similar irregular environment like Ondo State.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129187869","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
Broadband CPW-fed active monopole antenna for WLAN applications 用于WLAN应用的宽带cpw馈电有源单极天线
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308074
Yohan Jeong, Y. Jee
{"title":"Broadband CPW-fed active monopole antenna for WLAN applications","authors":"Yohan Jeong, Y. Jee","doi":"10.1109/AFRCON.2009.5308074","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308074","url":null,"abstract":"A coplanar waveguide (CPW)-fed monopole as a radiating element of an active antenna amplifier is proposed for chip size realization. A monopole antenna, which is integrated with a high electron mobility transistor (HEMT), demonstrates stable oscillations at a frequency of around 5.8 GHz within a 10 % bandwidth of 580 MHz (from 5.58 to 6.16 GHz). The active antenna has dimensions of 9 mm × 8 mm × 1.3 mm. The measurement results show that the antenna effective isotropic radiated power (EIRP) is +10.5 dBm, power added efficiency (PAE) 30.3 %, and the phase noise at 100 kHz offset −88.3 dBc/Hz.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128555547","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
Space-time-polarization diversity in multiple-input multiple-output communication systems 多输入多输出通信系统中的时空极化分集
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308186
Yakup Kilic, M. Koca, E. Anarim
{"title":"Space-time-polarization diversity in multiple-input multiple-output communication systems","authors":"Yakup Kilic, M. Koca, E. Anarim","doi":"10.1109/AFRCON.2009.5308186","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308186","url":null,"abstract":"In this work, we consider the use of multiple antenna signaling technologies, specifically space-time block coding (STBC) and spatial multiplexing (SM) schemes, in multiple-input multiple-output (MIMO) communication systems employing dual polarized antennas at both ends. The use of dual-polarized antennas theoretically double the number of virtual antennas used in the system. On the other hand, the correlation effects and the cross-polar discrimination (XPD) deteriorates the system performance. In our work, we consider these effects and present performance analysis of a 2 × 2 system with dual-polarized antennas for both STBC and SM cases. We also present simulation results for both multi-antenna signalling techniques together with hybrid approaches under various XPD and correlation scenarios. Both the theoretical analysis and the simulation results show a significant performance gain by joint utilization of space, time and polarization diversity in comparison to uni-polarized systems with the same number of antennas.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128633098","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 review of the widget landscape and incompatibilities between widget engines 回顾小部件情况和小部件引擎之间的不兼容性
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308146
P. Mendes, Marcos Cáceres, B. Dwolatzky
{"title":"A review of the widget landscape and incompatibilities between widget engines","authors":"P. Mendes, Marcos Cáceres, B. Dwolatzky","doi":"10.1109/AFRCON.2009.5308146","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308146","url":null,"abstract":"A widget is a packaged interactive client-side application, commonly developed using Web standards and techniques to access data services both on theWeb and host devices. The purpose of this paper is to review the widget landscape and present key characteristics and concerns of widget technologies. Various incompatibilities exist between widgets and the proprietary engines hosting them on different platforms. Incompatibilities can be classified by how different implementations handle issues related to packaging, behaviour, security and presentation. These common concerns, together with economic drivers have given rise to numerous standardisation efforts such as those being carried out by the W3C in drafting the widget family of specifications.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129833044","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
Assesment of harmonics generation on an off-shore mine and determination of mitigation equipment 近海矿井谐波产生的评估及缓解设备的确定
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308113
A. Batista, K. Awodele
{"title":"Assesment of harmonics generation on an off-shore mine and determination of mitigation equipment","authors":"A. Batista, K. Awodele","doi":"10.1109/AFRCON.2009.5308113","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308113","url":null,"abstract":"The aim of this paper is to assess the level of harmonics on a diamond mining ship in accordance with the NRS048 standards. The investigation was done on a DeBeers mining vessel, Debmar Pacific. After the measurements were obtained simulations of the ship's electrical system were carried out using DIgSILENT. The results of the simulation indicated the effectiveness of some proposed mitigation equipment in reducing the generated harmonics to acceptable levels.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129938463","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
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