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Classical conditioning implementation with realneuron networks 用realneuron网络实现经典条件反射
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401545
L.D. Erasmus
{"title":"Classical conditioning implementation with realneuron networks","authors":"L.D. Erasmus","doi":"10.1109/AFRCON.2007.4401545","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401545","url":null,"abstract":"This paper presents a contribution to computational modelling of associative learning through classical conditioning as known in the psychology. A seven-neuron RealNeuron network model, derived from neurobiological descriptions, and its performance is presented, using multiple resolution levels with configurable modular elements at each resolution level. RealNeurons are based on the structure of a biological neuron. With the RealNeuron's simple calculations, simulations on personal computers are possible and the simulated states on the highest, intermediate and lowest levels of resolution can be calculated using standard spreadsheet software. Further, a synthesis of a complex system, using an eleven-neuron RealNeuron network and integrates two classical-conditioning functions that can adapt to a changing poison and food environment, and its performance is presented.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"57 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":"124339254","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
Diode mounting topologies for X-band waveguide switches 用于x波段波导开关的二极管安装拓扑
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401455
T. Sickel, P. Meyer, P. Van Der Walt
{"title":"Diode mounting topologies for X-band waveguide switches","authors":"T. Sickel, P. Meyer, P. Van Der Walt","doi":"10.1109/AFRCON.2007.4401455","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401455","url":null,"abstract":"Diode mounting topologies for waveguide switches are presented and utilized to design and fabricate two evanescent- mode X-band modules of approximately 15 and 25% fractional bandwidth, comprising two packaged PIN diodes, with varying isolation, insertion loss and VSWR.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"21 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":"114709950","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
Intelligent mathematics assessment in eMax eMax中的智能数学评估
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401512
Annamária György, I. Vajda
{"title":"Intelligent mathematics assessment in eMax","authors":"Annamária György, I. Vajda","doi":"10.1109/AFRCON.2007.4401512","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401512","url":null,"abstract":"The emergence of the knowledge based society evoked a rapid expansion of student numbers enrolled in higher education. With increasing student numbers, however, the time necessary to assess the acquired knowledge in examinations approaches - or, with large student numbers, even exceeds-the time needed to deliver the lectures of a course. At the same time, distance learning systems have an urgent need to provide an integrated knowledge assessment component. These are the main reasons for the appearance of knowledge assessment systems (KAS's) in the 1970's as well as their steadily increasing importance. As shown in our paper, published KAS's do not support the evaluation of either freely formulated short answers or partially solved mathematical problems. However, the eMax KAS, developed at the Intelligent Knowledge Management Innovation Center of IBM Hungary and the John von Neumann Faculty of Informatics at Budapest Tech was conceived to fill this void. The short description of eMax and the method of quasi-automatic assessment of short texts can be found in a companion paper of the present conference. In this article we will demonstrate how eMax is capable of quasi-automatic assessment when answers are only partially correct, using questions of higher mathematics.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"217 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":"116015876","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: 13
On-line remote and automatic switching of consumers’ connection for optimal performance of a distribution feeder 在线远程和自动切换用户连接，以实现配电馈线的最佳性能
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401520
O. Popoola, A. Jimoh, D. Nicolae
{"title":"On-line remote and automatic switching of consumers’ connection for optimal performance of a distribution feeder","authors":"O. Popoola, A. Jimoh, D. Nicolae","doi":"10.1109/AFRCON.2007.4401520","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401520","url":null,"abstract":"Load balancing on phases is performed using a conventional trial and error approach. With this approach, service interruption is unavoidable; hence rearrangement of consumers load distribution points on phases cannot be performed frequently. Also phase voltage and current imbalances might improve using this approach but the change does last for too long. To get the secondary distribution to operate at its optimal performance, a technique in the form of remote and automated technology is needed. This paper contributes such a technology at the low voltage side of the distribution network. The proposed static transfer switching technology is based on the open-transition switch that enables transfer or arrangement of consumer loads in a three-phase system within milliseconds and supervisory control system for effective co-ordination, computational and control of other intelligent units.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"20 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":"127037649","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
Modeling industrial load due to severe voltage surges and sags: ‘A case study of magadi soda company’ 严重电压浪涌和跌落引起的工业负荷建模:“以马加迪苏打公司为例”
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401616
G. Irungu, A. Akumu, D. Murage
{"title":"Modeling industrial load due to severe voltage surges and sags: ‘A case study of magadi soda company’","authors":"G. Irungu, A. Akumu, D. Murage","doi":"10.1109/AFRCON.2007.4401616","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401616","url":null,"abstract":"Industrial load modeling is very important because it enables a power system engineer to determine the status of power system when subjected to gradual or sudden disturbances. This paper presents the measured electric load characteristics of Magadi Soda Company modeled using static model (ZIP model) and dynamic model (slip model). Simulations are done to compare if these models can capture the power quality effects. The result shows that for all the seven cases of sudden disturbances the load is wholly dynamic and the dynamic model gives very accurate results as compared to static model. The load model structure can also be used to estimate the technical energy losses. Symbols; P = active power, Q= reactive power, V = voltage and omega = angular frequency.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"31 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":"127228832","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
Some research issues in cognitive radio networks 认知无线电网络的若干研究问题
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401589
Gaurav Bansal, Md. Jahangir Hossain, P. Kaligineedi, H. Mercier, C. Nicola, Umesh Phuyal, Md. Mamunur Rashid, K. Wavegedara, Z. Hasan, M. Khabbazian, V. Bhargava
{"title":"Some research issues in cognitive radio networks","authors":"Gaurav Bansal, Md. Jahangir Hossain, P. Kaligineedi, H. Mercier, C. Nicola, Umesh Phuyal, Md. Mamunur Rashid, K. Wavegedara, Z. Hasan, M. Khabbazian, V. Bhargava","doi":"10.1109/AFRCON.2007.4401589","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401589","url":null,"abstract":"The cognitive radio (CR) technology will allow a group of potential users to identify and access available spectrum resources provided that the interference to the users for whom the band has been licensed is kept below a prescribed level. However, this research area is at a very immature stage because various research challenges have to be addressed and solved. In this paper our objective is to present an overview of some research issues for CR networks. Specifically, we present some research and development in CR networks with focus on i) information- theoretic aspects, ii) spectrum sensing, iii) link adaptation, iv) advanced transceiver design, and v) admission control. We also discuss some important research problems related to these specific topics that needs to be addressed before deployment of CR systems in practice.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"4 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":"129026624","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: 34
Aspects and solutions to designing standard LVCMOS I/O buffers in 90nm process 90nm制程标准LVCMOS I/O缓冲器设计要点及解决方案
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401475
P. Kannan, K. Raghunathan, S. Jayaraman
{"title":"Aspects and solutions to designing standard LVCMOS I/O buffers in 90nm process","authors":"P. Kannan, K. Raghunathan, S. Jayaraman","doi":"10.1109/AFRCON.2007.4401475","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401475","url":null,"abstract":"Low voltage complementary metal oxide semiconductor (LVCMOS) buffers provide single ended IO interface to the external devices in system on chip (SoC) designs. This paper covers functional operations of basic blocks of the LVCMOS output buffer and input buffer in detail and the design considerations and challenges at each phase of the design. It also explains how the phenomena such as the hot carrier effect, gate oxide integrity and the like affect the performance and reliability of the buffer and the techniques employed to cope with the effects.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"96 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":"125683247","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
Vibrating sample magnetometer for large permanent magnets 用于大型永磁体的振动样品磁强计
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401540
A. Ribeiro
{"title":"Vibrating sample magnetometer for large permanent magnets","authors":"A. Ribeiro","doi":"10.1109/AFRCON.2007.4401540","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401540","url":null,"abstract":"This paper describes a vibrating sample magnetometer (VSM) intended to measure the magnetic moment of large permanent magnets. The reciprocity theorem was used to preview the pick-up coils output voltage. The finite element method was utilized to determine the magnetic field produced by a unitary current in the pick-up coils. The sensitivity of the magnetometer was determined by the measurements carried out with a well characterized sample.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"42 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":"132015745","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
Enhancing performance of Bayes classifier for the hardened password mechanism 增强强化密码机制下贝叶斯分类器的性能
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401574
N. Pavaday, K. Soyjaudah
{"title":"Enhancing performance of Bayes classifier for the hardened password mechanism","authors":"N. Pavaday, K. Soyjaudah","doi":"10.1109/AFRCON.2007.4401574","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401574","url":null,"abstract":"In pattern recognition, Bayes classifier is considered a powerful tool in the decision making process as its gives the lowest probability of committing a classification error. This has been highlighted in a number of previous works. The diversity in algorithm parameters, criteria used and number of users involved as well as the evaluation method makes the task of comparing their results and selecting an appropriate system a very thorny one. The purpose of this paper is four fold: to study the different approaches reported using a true password, to establish how normalization and using a single variance/mean impact on the results, using a maximum number of features does necessarily improve performance and finally demonstrate that performance optimization is feasible through careful selection of features and approach taken.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"515 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":"123079895","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
Fuzzy logic congestion control in IEEE 802.11 wireless local area networks: A performance evaluation IEEE 802.11无线局域网中的模糊逻辑拥塞控制:性能评估
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401645
Clement N. Nyirenda, D. Dawoud
{"title":"Fuzzy logic congestion control in IEEE 802.11 wireless local area networks: A performance evaluation","authors":"Clement N. Nyirenda, D. Dawoud","doi":"10.1109/AFRCON.2007.4401645","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401645","url":null,"abstract":"In 802.11 wireless local area networks, the wired and the wireless interfaces of the access point are characterized by the disparity in channel capacity. This presents a significant bottleneck for traffic flowing from the wired network to the wireless network. Therefore, the implementation of a congestion control mechanism in access points promises to be a suitable solution. Recently, a particle swarm optimized fuzzy logic congestion detection (FLCD) was proposed for IP networks. This algorithm synergistically combines the good characteristics of traditional active queue management (AQM) algorithms and fuzzy logic based AQM algorithms. Its membership functions are designed automatically by using a multi-objective particle swarm optimization (MOPSO) algorithm in order to achieve optimal performance on all the major performance metrics of IP congestion control. In this paper, we evaluate the performance of the FLCD algorithm in the wireless local area network environment. We compare its performance with that of ARED and the Droptail mechanism. Simulation results show that the FLCD algorithm helps to minimize UDP traffic delay, packet loss rates. In terms of throughput, the FLCD algorithm exhibits similar performance to the other schemes. Its UDP jitter is slightly higher than that of the Droptail mechanism but better than that of ARED.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"7 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":"126305102","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
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