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A time step choice algorithm for transient analysis of circuits 电路瞬态分析的时间步长选择算法
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308136
F. Constantinescu, A. Gheorghe, M. Nitescu
{"title":"A time step choice algorithm for transient analysis of circuits","authors":"F. Constantinescu, A. Gheorghe, M. Nitescu","doi":"10.1109/AFRCON.2009.5308136","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308136","url":null,"abstract":"A new error and a new time step choice algorithm are proposed. A comparison with the SPICE results is given for a linear circuit, showing that the proposed algorithm rejects a smaller number of time steps.","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":"129525973","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
The PV grid-connected demonstration system of University “Politehnica” of Bucharest 布加勒斯特“Politehnica”大学光伏并网示范系统
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308077
A. Craciunescu, M. Popescu, C. Popescu, G. Ciumbulea
{"title":"The PV grid-connected demonstration system of University “Politehnica” of Bucharest","authors":"A. Craciunescu, M. Popescu, C. Popescu, G. Ciumbulea","doi":"10.1109/AFRCON.2009.5308077","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308077","url":null,"abstract":"In 2006, at University Politehnica of Bucharest, in the framework of the European demonstration project PV-Enlargement, and of the Romanian project “PV grid”, a rooftop grid-connected photovoltaic power generation system of 30 kWp has been installed. This is a Double Array PV System containing two kinds of silicon modules: crystalline and amorphous. The installed power of crystalline modules is of 27.36 kWp and that of amorphous modules is of 3.24 kWp. This paper gives a survey of amorphous Silicon array performances during 12 representative working months under specific operational and environmental conditions of Bucharest geographical location.","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":"129908801","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
Evaluating and optimising accelerometer-based gesture recognition techniques for mobile devices 评估和优化基于加速度计的移动设备手势识别技术
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308175
G. Niezen, G. Hancke
{"title":"Evaluating and optimising accelerometer-based gesture recognition techniques for mobile devices","authors":"G. Niezen, G. Hancke","doi":"10.1109/AFRCON.2009.5308175","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308175","url":null,"abstract":"The objective of this study was to evaluate the various gesture recognition algorithms currently in use, after which the most suitable algorithm was optimized in order to implement it on a mobile device. Gesture recognition techniques studied include hidden Markov models, artificial neural networks and dynamic time warping. A dataset for evaluating the gesture recognition algorithms was gathered using a mobile device's embedded accelerometer. The algorithms were evaluated based on computational efficiency, recognition accuracy and storage efficiency. The optimized algorithm was implemented on the mobile device to test the empirical validity of the study.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"67 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":"128900674","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: 35
Small wind turbine power curve comparison 小型风力机功率曲线对比
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308281
Z. Šimić, M. B. Vrhovčak, D. Šljivac
{"title":"Small wind turbine power curve comparison","authors":"Z. Šimić, M. B. Vrhovčak, D. Šljivac","doi":"10.1109/AFRCON.2009.5308281","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308281","url":null,"abstract":"This paper focus is on the small wind turbines resource potential estimation. Assessment is done for seven selected small wind turbines and one measured set of wind speed data with the micropower optimization modeling tool HOMER. Goal was to investigate how estimated energy production and economical parameters are sensitive to the selection of small wind turbine. Selected turbines have similar rated power, but different blades diameter and aerodynamic characteristics. Energy production was quantified for one year with hourly resolution. Results from all different wind turbines were compared on the power production base, and on the economical base. Two sensitivity cases related to the wind speed and installation lifetime were also simulated. Results are showing significant importance of the small wind turbine selection for the both total energy production and economical feasibility. This makes small wind turbine characteristics such as reliability and power curves testing very important.","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":"134272357","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: 11
Impact of multipath channel parameters on channel estimation performance in OFDM systems OFDM系统中多径信道参数对信道估计性能的影响
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308191
E. Golovins, N. Ventura
{"title":"Impact of multipath channel parameters on channel estimation performance in OFDM systems","authors":"E. Golovins, N. Ventura","doi":"10.1109/AFRCON.2009.5308191","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308191","url":null,"abstract":"Performance of wireless OFDM systems significantly depends on channel estimation accuracy. However, it is difficult to take into account all possible scenarios as the variance of error at the output of the minimum mean square error (MMSE) estimator depends on the second-order channel statistics. In this paper, we derive the lower and the upper MSE bounds, characterising the best and the worst-case channel estimation performance, and discuss channel conditions when these bounds are attained.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"7 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":"131104231","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
Design and application of axial-flux permanent magnet wheel motors for an electric vehicle 电动汽车轴向磁通永磁轮式电机的设计与应用
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308107
Yee-Pien Yang, Jiaojiao Liang, Xian-Yee Xing
{"title":"Design and application of axial-flux permanent magnet wheel motors for an electric vehicle","authors":"Yee-Pien Yang, Jiaojiao Liang, Xian-Yee Xing","doi":"10.1109/AFRCON.2009.5308107","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308107","url":null,"abstract":"This paper introduces an optimal design of an axial-flux permanent magnet wheel motor for a small electric vehicle. This vehicle is driven directly by two wheel motors installed on its rear wheels, which are compact, low weight, and highly efficient. The optimal current waveform of the same pattern as the back electromagnetic force is used to increase the output torque and efficiency, while the field weakening control is used to extend the speed range of the motor. The electric differential system is proposed for stable maneuverability of the vehicle against system uncertainties and external disturbances.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"42 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":"133503718","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
Combined field integral equation formulation for broad wall radiating slots of arbitrary shape 任意形状宽壁辐射槽的联合场积分方程
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308211
D. Konditi, Vasant Dharmadhikary, E. K. Koech, J. Makiche
{"title":"Combined field integral equation formulation for broad wall radiating slots of arbitrary shape","authors":"D. Konditi, Vasant Dharmadhikary, E. K. Koech, J. Makiche","doi":"10.1109/AFRCON.2009.5308211","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308211","url":null,"abstract":"In this paper CFIE formulation is presented to analyze broad wall slots of arbitrary shape partially filled with homogeneous dielectric materials. The “generalized network formulation” for aperture problems is formulated in terms of linear operator equations and expanded in RWG functions in a Galerkin sense. The approach uses a simultaneous representation of the equivalent surface current densities. Representative aperture shapes have been considered such as rectangular, elliptic, and cross—shaped. Numerical results are presented, which are in good agreement with the published data.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"54 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":"129736255","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
Development of competitive advantage in the apparel industry in Kenya 肯尼亚服装产业竞争优势的发展
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308084
A. Mastamet-Mason, M. Kachieng'a
{"title":"Development of competitive advantage in the apparel industry in Kenya","authors":"A. Mastamet-Mason, M. Kachieng'a","doi":"10.1109/AFRCON.2009.5308084","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308084","url":null,"abstract":"The Kenyan apparel industry has played a major role in the country's economic development; however, the sector's competitiveness has decreased due to inadequate industrial strategy and the loss of global markets resulting from the elimination of quotas in 2005. China's and other Asian countries' abilities have been able to produce quality products efficiently and at lower comparative costs has been threatening apparel manufacturers in Kenya. This paper examines how apparel firms could develop competitive advantages in both local and global markets. It uses Porter's (1998b) diamond model as a basis of analysis for interpreting competitive factors within Kenya's apparel industry. In addition to literature reviews, the paper provides an overview of Kenya's apparel sector business dynamics and its relationships with local and global markets. Conclusions are drawn based on Porter's analysis of theoretical models in relationship to Kenya's apparel industry business dynamics. Taking into account the global apparel business factors, recommendations are made on how the Kenya's apparel industry can regain business competitiveness.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"30 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":"116324158","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: 7
Analysis of adaptive FIR filter pre-emphasis for high speed serial links 高速串行链路自适应FIR滤波器预重点分析
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308166
M. Goosen, S. Sinha
{"title":"Analysis of adaptive FIR filter pre-emphasis for high speed serial links","authors":"M. Goosen, S. Sinha","doi":"10.1109/AFRCON.2009.5308166","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308166","url":null,"abstract":"Due to the advances of technology in multimedia applications in recent years, the demand for high bandwidth point to point communication links has increased significantly. Jitter requirements have become more stringent with higher speed serial communication links. Jitter degrades the signal integrity at the receiver by introducing a timing deviation from the ideal or expected timing event. A proposal for reducing jitter, with the main focus on reducing data dependent jitter, is presented by employing adaptive finite impulse response (FIR) filter pre-emphasis. The channel bandwidth limitation, mainly caused by the skin effect of the conductor, and the parasitic components added by the integrated circuit package cause a nonflat frequency response and hence data dependent jitter. The pre-emphasis FIR filter is used to compensate for the frequency dependent chip package parasitic effects and the copper communication channel by altering the signal waveform before transmission. This paper presents the analysis and evaluation of adaptive FIR filter pre-emphasis to reduce data dependent jitter and to ultimately achieve higher data rates without adding significant implementation complexity. Simulation results on the adaptation scheme are also presented.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"220 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":"133625605","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
Analytical design and analysis of Line-Start Permanent Magnet Synchronous Motors 直线起动永磁同步电动机的解析设计与分析
AFRICON 2009 Pub Date : 2009-11-03 DOI: 10.1109/AFRCON.2009.5308177
D. Stoia, M. Cernat, A. Jimoh, D. Nicolae
{"title":"Analytical design and analysis of Line-Start Permanent Magnet Synchronous Motors","authors":"D. Stoia, M. Cernat, A. Jimoh, D. Nicolae","doi":"10.1109/AFRCON.2009.5308177","DOIUrl":"https://doi.org/10.1109/AFRCON.2009.5308177","url":null,"abstract":"The Line-Start Permanent Magnet Synchronous Motor (LSPMSM) attracted a considerable attention because of the higher value of the product between the power factor and the efficiency. The paper proposes an analytical design method for the LSPMSM, considering the asynchronous starting and the synchronous steady state parameters. Using this theoretical approach, all the synchronous and asynchronous starting characteristics will be calculated. The design of a motor having the following specifications: rated output power 3.5 kW, rated voltage 200 V, rated frequency 50 Hz, rated speed 3000 rpm is presented.","PeriodicalId":122830,"journal":{"name":"AFRICON 2009","volume":"33 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":"132580506","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
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