2013 Africon最新文献

Design, environmental and sustainability constraints of new African observatories: The example of the Mozambique Radio Astronomy Observatory 非洲新天文台的设计、环境和可持续性限制:以莫桑比克射电天文台为例

2013 Africon Pub Date : 2013-11-18 DOI: 10.1109/AFRCON.2013.6757829

D. Barbosa, M. Bergano, Valério Ribeiro, A. Loots, V. Thondikulam, M. Gaylard, A. Ardenne, C. Paulo, S. Colafrancesco, Jose Carlos Amador, Rodrigo Maia, Rui Melo

引用次数: 3

Characterization of medical images using edge density 利用边缘密度表征医学图像

2013 Africon Pub Date : 2013-11-01 DOI: 10.1109/ICASTECH.2013.6707511

Nevesh Rajaram, S. Viriri

{"title":"Characterization of medical images using edge density","authors":"Nevesh Rajaram, S. Viriri","doi":"10.1109/ICASTECH.2013.6707511","DOIUrl":"https://doi.org/10.1109/ICASTECH.2013.6707511","url":null,"abstract":"The use of medical images by medical practitioners has increased to an extent that computers have become a necessity in the image processing and analysis. These images along with their detail are crucial when practitioners are diagnosing medical problems in patients. This research investigates if the edge density of a medical image can be used to characterize it. The performance of the edge density feature is assessed by finding its accuracy to retrieve images of the same group from a database. The medical images used in this research are x-rays of the humane body from five different regions, namely; hands, breast, pelvis, skull and chest regions. The edge density feature has shown to produce considerably good results in both, classification of medical images and image retrieval. For the classification using the nearest neighbor and 5-nearest neighbor techniques yielded 82.5% and 85% classification success rates respectively and 75.75% for image retrieval. The edge density approach used in this research is comparable to approaches used in literature considering that other approaches used more than one feature to achieve a higher accuracy and the results obtained in this paper only uses the edge density feature.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130940992","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

Robust real-time face recognition 鲁棒实时人脸识别

2013 Africon Pub Date : 2013-10-07 DOI: 10.1145/2513456.2513494

B. Lagerwall, Serestina Viriri

引用次数: 5

Investigation on the interfering effect of feeding network on the performance of a beamforming antenna array 馈电网络干扰对波束形成天线阵列性能影响的研究

2013 Africon Pub Date : 2013-09-09 DOI: 10.1109/AFRCON.2013.6757744

Samuel Ajiboye, Yi Wang

引用次数: 1

Impulsive observer-based control for linear systems using irregularly sampled measurements 采用不规则采样测量的线性系统的脉冲观测器控制

2013 Africon Pub Date : 2013-09-09 DOI: 10.1109/AFRCON.2013.6757659

Y. Khaled, J. Barbot, K. Busawon, D. Benmerzouk

{"title":"Impulsive observer-based control for linear systems using irregularly sampled measurements","authors":"Y. Khaled, J. Barbot, K. Busawon, D. Benmerzouk","doi":"10.1109/AFRCON.2013.6757659","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757659","url":null,"abstract":"In this paper, we consider the issue of stabilizing a class of linear systems using irregular sampled output measurements. For this purpose, we design a standard linear state feedback controller and an impulsive observer to provide an estimate the non-measured states, which are subsequently fed back in the control algorithm. We consider linear systems that can be decomposed, via a change of coordinates, into their respective measured and unmeasured dynamics. We consider the cases where the unmeasured subspace is stable and unstable respectively. In the case where the unmeasured subspace is stable, we employ a standard impulsive observer coupled with a continuous linear feedback control to stabilise the system. In the case where the unmeasured subspace is unstable, we employ two cascaded observers - an impulsive and a Luenberger observer - in conjunction with a linear feedback control to stabilise the latter. In order to prove the stability of the overall closed-loop system we proposed a practical stability result for a class of linear impulsive systems. Some simulation results are presented to show the performance of the observer-based control. Finally, some conclusions are drawn.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"13 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132606051","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: 8

A clustering algorithm based on energy variance and coverage density in centralized hierarchical Wireless Sensor Networks 集中式分层无线传感器网络中基于能量方差和覆盖密度的聚类算法

2013 Africon Pub Date : 2013-09-09 DOI: 10.1109/AFRCON.2013.6757627

R. Randriatsiferana, F. Alicalapa, R. Lorion, A. Mohammed

{"title":"A clustering algorithm based on energy variance and coverage density in centralized hierarchical Wireless Sensor Networks","authors":"R. Randriatsiferana, F. Alicalapa, R. Lorion, A. Mohammed","doi":"10.1109/AFRCON.2013.6757627","DOIUrl":"https://doi.org/10.1109/AFRCON.2013.6757627","url":null,"abstract":"In Wireless Sensor Network (WSN), the clustering algorithm was developed to reduce the total energy consumption which determines the lifetime of the whole network. As a result, a number of recently-designed energy-efficient routing algorithms stated that clustering approach has an important issue for organizing a network into a connected hierarchy and increasing the network lifetime. This paper proposes a new algorithm to improve the performance of Low Energy Adaptive Clustering Centralized (LEACH-C) by improving the criterion for electing a cluster-head and the determination of optimal number of cluster-heads. Firstly, the optimal number of cluster-heads is based on the density of the covering. The sensor nodes are deployed randomly on the plane area of the sensing field covered by the communication range of the node. Secondly, nodes having the highest remaining energy and the lowest energy variance consumption becomes cluster-heads. The variance parameter keeps energy consumption dispersion, if the considered node is elected as cluster-head. This dispersion highly depends on the relative positioning of the node to the base station. This is useful for predicting node status when elected as cluster-head in the current round in order to balance the network energy. The simulation and analytical results of the proposed algorithm outperform the existing protocols in terms of lifetime of the network.","PeriodicalId":159306,"journal":{"name":"2013 Africon","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130569082","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

Considerations for the optimal radio astronomy site featuring the square kilometre array as an example 以平方公里阵列为例的射电天文最佳观测点的考虑

2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757825

R. Millenaar

引用次数: 0

Robust behavioral non uniform look-up table spacing in adaptive digital baseband predistortion technique for RF power amplifier 射频功率放大器自适应数字基带预失真技术鲁棒性非均匀查找表间距

2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757706

G. Coviello, F. Cannone, G. Avitabile

引用次数: 2

Frequency optimization for narrowband power-line communications 窄带电力线通信的频率优化

2013 Africon Pub Date : 2013-09-01 DOI: 10.1109/AFRCON.2013.6757605

T. O. Sanya, T. Swart, H. Ferreira