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2021 IEEE AFRICON最新文献

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Calculation of TVWS Spectrum Availability Using Geo-location White Space Spectrum Database 利用地理位置空白频谱数据库计算TVWS频谱可用性
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570915
H. M. Hussien, K. Katzis, L. Mfupe, E. Bekele
Many rural and low-income areas around the globe have poor quality (or no) internet service with limited telephone coverage due to a lack of infrastructure, insufficient power supply, and a limited core telecommunications network. Because of limited mobile device propagation capabilities, sparse population density and poor purchasing power, it is not economically feasible for mobile operators to deploy traditional communication networks in these regions. Researchers recently discovered that a portion of the underutilized TV spectrum known as TV white space (TVWS) could be suitable for those areas in terms of bandwidth, improved reception features, good penetration of buildings, and broad reach. This paper presents a comprehensive evaluation of available TVWS channels in Ethiopia using a Geolocation Database front-end (GLSD) aided by the CSIR Calculation Engine hosted by the CSIR Meraka Institute. GLSD and the CSIR calculation engine together are able to quantify the amount of TVWSs through dynamically allocating the TVWS network radio services according to the geographic position of WSDs. The GLSD was developed using the ITU-R P.1546-5 propagation model. Using the GLSD and the CSIR calculation engine, the quantification of TVWS free channels are calculated. The results show that among the 58 VHF and UHF TV channels, 52 of the channels are free (underutilized) in Ethiopia. These free channels can be employed to provide wireless broadband solutions for connecting the rural areas as well as offloading the urban traffic.
由于缺乏基础设施、电力供应不足和有限的核心电信网络,全球许多农村和低收入地区的互联网服务质量很差(或没有),电话覆盖范围有限。由于移动设备传播能力有限,人口密度稀疏,购买力差,移动运营商在这些地区部署传统通信网络在经济上不可行。研究人员最近发现,从带宽、改进的接收特性、良好的建筑物穿透性和广泛的覆盖范围等方面来看,被称为电视空白空间(TVWS)的未充分利用的电视频谱的一部分可能适合这些地区。本文使用地理定位数据库前端(GLSD)对埃塞俄比亚可用的TVWS频道进行了全面评估,该数据库前端由CSIR Meraka研究所托管的CSIR计算引擎辅助。GLSD和CSIR计算引擎可以根据无线电视服务地点的地理位置动态分配无线电视服务,从而量化无线电视服务的数量。GLSD采用ITU-R P.1546-5传播模型开发。利用GLSD和CSIR计算引擎,对TVWS的空闲信道进行了量化计算。结果表明,在埃塞俄比亚58个甚高频和超高频电视频道中,有52个频道是免费的(未充分利用的)。这些免费通道可用于提供无线宽带解决方案,用于连接农村地区以及卸载城市交通。
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引用次数: 1
EKV Model for Bulk-Driven Circuit Design Using gmb/ID Method 基于gmb/ID方法的批量驱动电路设计EKV模型
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570960
L. Nagy, D. Arbet, M. Kovác, M. Potocný, R. Ondica, V. Stopjaková
The paper addresses a development and application of EKV MOS transistor compact model with focus on the ultra low-voltage / ultra low-power analog integrated circuit (IC) design employing bulk-driven (BD) technique. The presented contribution can be viewed as an extension of standard EKV model application and as a contribution to ultra low-voltage IC design techniques. The paper compares the measured and extracted small-signal parameters of standalone transistor samples fabricated in 130 nm CMOS technology and the simulation results obtained using the proposed bulk-driven EKV v2.63 model and foundry-provided BSIM model v3.3. The transistor samples were analyzed with power supply of VDD = 0.4 V The paper also discusses the implementation of 3D graphs as a result of introducing another degree of freedom into the essential MOS transistor characteristics, while maintaining the ease of using the design hand-calculation with the original gm/ID approach.
本文介绍了EKV MOS晶体管小型化模型的开发和应用,重点介绍了采用体积驱动(BD)技术的超低电压/超低功耗模拟集成电路的设计。所提出的贡献可以被视为标准EKV模型应用的扩展,并作为对超低电压集成电路设计技术的贡献。本文比较了采用130 nm CMOS工艺制备的独立晶体管样品的测量和提取的小信号参数,以及采用本文提出的体积驱动EKV v2.63模型和代工厂提供的BSIM v3.3模型的仿真结果。在VDD = 0.4 V的电源条件下,对晶体管样品进行了分析,并讨论了三维图形的实现,这是由于在MOS晶体管的基本特性中引入了另一个自由度,同时保持了使用原始gm/ID方法进行设计手工计算的便利性。
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引用次数: 1
The Viability of a Non-Flow Capacitive Biosensing Microsystem for Whole Cell Counting 全细胞计数非流动电容性生物传感微系统的可行性
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570870
G. Andrews, U. Hilleringmann, T. Joubert
An analysis on the viability of implementing non-flow based capacitive biosensing for bulk counting of whole cancer cells is presented. A mathematical model is implemented based on established research to test the validity of the hypothesis that cells are considered to act like parallel electric connections. A finite element analysis model is also presented to investigate the effect of electrode geometry and cell position on the measured capacitance. The electrical interaction between cells is found not to be strictly parallel and in fact dependent on a host of uncontrollable parameters. Bulk sensing of multiple cells is found to be impractical for a single electrode setup due to the unpredictability of cell location and cell interactions. An array-based implementation is proposed, which allows for the use of current models and data of single-cell analyses to be used.
分析了实现基于非流动的电容生物传感对整个癌细胞进行批量计数的可行性。在已有研究的基础上,建立了一个数学模型,以检验细胞被认为是平行电连接的假设的有效性。本文还建立了一个有限元分析模型来研究电极几何形状和电池位置对测量电容的影响。发现细胞之间的电相互作用不是严格平行的,实际上依赖于一系列不可控的参数。由于细胞位置和细胞相互作用的不可预测性,发现单个电极设置对多个细胞的批量传感是不切实际的。提出了一种基于阵列的实现,它允许使用当前的模型和单细胞分析数据。
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引用次数: 0
Tracking and Notification Enabled Remote Water Quality Monitoring System 跟踪和通知远程水质监测系统
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570847
Mlanjeni Tikiso, E. N. Mambou, T. Swart
Many countries in the world, in particular the least developed ones, face the challenge of unhealthy drinking water. In this paper, the design and implementation of a trackable and notification-enabled remote water quality monitoring system prototype is proposed to mitigate this problem. The system is aimed at remotely monitoring the quality of water in fixed or erected and motorized or mobile storage water tanks. The system can be adopted for use by countries to enhance their rural villages’ water supply schemes and to help remote villages have access to clean and healthy drinking water. Besides quality monitoring, the system also features location tracking in the case of motorized tanks, which get transported to different destinations as part of the rural water supply schemes.
世界上许多国家,特别是最不发达国家,面临着不健康饮用水的挑战。本文提出了一种可跟踪且具有通知功能的远程水质监测系统原型的设计和实现,以缓解这一问题。该系统的目的是远程监测固定或竖立、机动或移动储水罐中的水质。该系统可被各国采用,以加强其农村供水计划,并帮助偏远村庄获得清洁和健康的饮用水。除了质量监测外,该系统还具有机动水箱的位置跟踪功能,这些水箱作为农村供水计划的一部分被运送到不同的目的地。
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引用次数: 0
Analysis of Solar Energy Potential Using Sunshine Based Model 基于日照模式的太阳能潜力分析
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570973
Ayodeji Olalekan Salau, Sodessa Soma Shonkora, V. A. Owoeye
Solar photovoltaics are in recent times being used to replace fuel-based lighting and off-grid electrical needs. This study presents the evaluation of solar photovoltaic power systems in Dirashe Woreda of Ethiopia. The study was performed to assess and analysis the data which were acquired from the selected site. A descriptive survey was used to assess the information gathered. Empirical models were used to forecast the radiation based on sunshine hours. The linear monthly average solar radiation of the study site was calculated using data from the National Aeronautics and Space Administration (NASA). The study also includes an estimate of the study area’s solar energy resource based on primary data collected between January and December 2019. Finally, an equation using Angstrom-Prescott Model was derived for the study area.
近年来,太阳能光伏发电被用于替代基于燃料的照明和离网电力需求。本研究介绍了埃塞俄比亚diashe wooreda太阳能光伏发电系统的评价。进行这项研究是为了评估和分析从选定地点获得的数据。一项描述性调查被用来评估收集到的信息。利用经验模型对日照时数进行辐射预报。研究地点的线性月平均太阳辐射是使用美国国家航空航天局(NASA)的数据计算出来的。该研究还包括根据2019年1月至12月收集的主要数据对研究区域太阳能资源的估计。最后,用Angstrom-Prescott模型推导了研究区的方程。
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引用次数: 1
PyPSA meets Africa: Developing an open source electricity network model of the African continent PyPSA会见非洲:开发非洲大陆的开源电力网络模型
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570911
D. Kirli, Johannes Hampp, Koen van Greevenbroek, Rebecca Grant, Matin Mahmood, Maximilian Parzen, A. Kiprakis
Electricity network modelling and grid simulations form a key enabling element for the integration of newer and cleaner technologies such as renewable energy generation and electric vehicles into the existing grid and energy system infrastructure. This paper reviews the models of the African electricity systems and highlights the gaps in the open model landscape. Using PyPSA (an open Power System Analysis package), the paper outlines the pathway to a fully open model and data to increase the transparency in the African electricity system planning. Optimisation and modelling can reveal viable pathways to a sustainable energy system, aiding strategic planning for upgrades and policy-making for accelerated integration of renewable energy generation and smart grid technologies such as battery storage in Africa.
电网建模和电网模拟是将更新和更清洁的技术(如可再生能源发电和电动汽车)整合到现有电网和能源系统基础设施中的关键促成因素。本文回顾了非洲电力系统的模型,并强调了开放模型景观中的差距。利用PyPSA(一个开放的电力系统分析包),本文概述了实现完全开放的模型和数据的途径,以提高非洲电力系统规划的透明度。优化和建模可以揭示通往可持续能源系统的可行途径,有助于升级的战略规划和政策制定,以加速非洲可再生能源发电和智能电网技术(如电池存储)的整合。
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引用次数: 2
Neural Network Model for Talent Recruitment and Management for Employee Development and Retention 面向员工发展与保留的人才招聘与管理的神经网络模型
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9571014
P. N. Mwaro, Kennedy Ogada, W. Cheruiyot
Talent management is the process of identifying the vacant position, recruiting the suitable person, developing the skills and expertise of the person to make the person more suitable for the position and retaining him to achieve long term business objectives of the institution. The purpose of this research was to develop a machine learning model for talent recruitment and management for use in human resource department. The research therefore proposes a human resource Ensemble neural network model for use in talent recruitment and management for employee development and retention. The model developed attained a predictive accuracy of 95.313% and this showed that machine learning models can be used successively for talent recruitment in human resource department. The study explores literature review on neural network and how it has been used which gives the basis of this study.
人才管理是确定空缺职位,招聘合适的人,发展此人的技能和专业知识,使其更适合该职位,并留住他以实现机构的长期业务目标的过程。本研究的目的是开发一个用于人力资源部门人才招聘和管理的机器学习模型。因此,本研究提出了一个人力资源集成神经网络模型,用于人才招聘和管理,以促进员工的发展和保留。该模型的预测准确率达到95.313%,表明机器学习模型可以连续应用于人力资源部门的人才招聘。本研究对神经网络及其应用的文献综述进行了探讨,为本研究提供了基础。
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引用次数: 1
Dielectric properties of fertilized soil in a Catena: A case of Mwanza, Tanzania Catena中肥沃土壤的介电特性:以坦桑尼亚姆万扎为例
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570901
Bonny Mgawe, Twahir Kazema, Hoang Nam Dao, M. Krairiksh
This work reports the investigation results on how dielectric properties of soil change with fertilizer concentration for catena in Mwanza of Tanzania at 945 MHz frequency band using reflection measurement. Composite soil samples were collected from three catenas: upper, middle, and lower catena sites in Misungwi district located in Mwanza, Tanzania. Two chemical fertilizers UREA and CAN were used since they are widely used in these areas. With the low-cost equipment, reliable results are obtained that show relationship of soil fertility and dielectric properties. The results provide essential information for preparing on-farm measurement to get soil fertility contour that supports land management.
本文报道了利用反射测量方法对坦桑尼亚姆万扎地区945 MHz频段土壤介电特性随肥料浓度变化的调查结果。在坦桑尼亚姆万扎Misungwi地区的上、中、下三个连环区收集了复合土壤样品。由于这些地区广泛使用尿素和CAN两种化肥。利用低成本的设备,获得了可靠的土壤肥力与介电特性关系的研究结果。研究结果为准备农场测量以获得支持土地管理的土壤肥力等高线提供了重要信息。
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引用次数: 0
Deep Learning Traffic Classification in Resource-Constrained Community Networks 资源受限社区网络中的深度学习流量分类
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570875
Matthew Dicks, Josiah Chavula
Community networks are infrastructures that are run by the citizens for the citizens. These networks are often run with limited resources compared to traditional Internet Service Providers. For such networks, careful traffic classification can play an important role in improving quality of service. Deep learning techniques have been shown to be effective for this classification task, especially since classical approaches struggle to deal with encrypted traffic. However, deep learning models often tend to be computationally expensive, which limits their suitability for low-resource community networks. This paper explores the computational efficiency and accuracy of Long Short-Term Memory (LSTM) and Multi-Layer Perceptron (MLP) deep learning models for packet-based classification of traffic in a community network. We find that LSTM models attain higher out-of-sample accuracy than traditional support vector machines classifiers and the simpler multi-layer perceptron neural networks, given the same computational resource constraints. The improvement in accuracy offered by the LSTM has a tradeoff of slower prediction speed, which weakens their relative suitability for use in real-time applications. However, we observe that by reducing the size of the input supplied to the LSTMs, we can improve their prediction speed whilst maintaining higher accuracy than other simpler models.
社区网络是由市民为市民运营的基础设施。与传统的互联网服务提供商相比,这些网络通常以有限的资源运行。对于这样的网络,仔细的流分类对提高服务质量起着重要的作用。深度学习技术已被证明对这种分类任务是有效的,特别是因为经典方法难以处理加密流量。然而,深度学习模型往往在计算上很昂贵,这限制了它们对低资源社区网络的适用性。本文探讨了长短期记忆(LSTM)和多层感知器(MLP)深度学习模型在社区网络中基于分组的流量分类中的计算效率和准确性。我们发现,在相同的计算资源约束下,LSTM模型比传统的支持向量机分类器和更简单的多层感知器神经网络获得更高的样本外精度。LSTM提供的精度提高是以较慢的预测速度为代价的,这削弱了它们在实时应用中使用的相对适用性。然而,我们观察到,通过减少提供给lstm的输入的大小,我们可以提高它们的预测速度,同时保持比其他简单模型更高的精度。
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引用次数: 1
Facial Recognition Security Alert System 面部识别安全警报系统
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570855
Gabriela Da Silva Sousa, E. N. Mambou, T. Swart
In this paper the design and implementation of a real-time face recognition security system is presented. The security system demonstrates how surveillance can be adapted to offer a greater level of security with facial recognition. The security system was implemented in a four-person household. Results show that the designed facial recognition security system achieved a 100% training and 96% validation accuracy with a 100% accuracy on the test images dataset consisting of unseen images of the four enrolled users.
本文介绍了一种实时人脸识别安全系统的设计与实现。该安全系统展示了如何通过面部识别来调整监控以提供更高级别的安全。安全系统是在一个四口之家实施的。结果表明,所设计的人脸识别安全系统在由4个注册用户的未见图像组成的测试图像数据集上实现了100%的训练准确率和96%的验证准确率。
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引用次数: 3
期刊
2021 IEEE AFRICON
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