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2021 IEEE AFRICON最新文献

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[AFRICON 2021 Front cover] [AFRICON 2021封面]
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570903
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引用次数: 0
Circular Monopole Time Reversal Mirror for Microwave Wireless Power Transfer Applications 微波无线电力传输用圆形单极时间反转镜
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570867
Baidenger Agyekum Twumasi, Jia‐lin Li, Ebenezer Tawiah Ashong, S. Menanor
This paper presents the design of a circular microstrip patch antenna time reversal mirror (TRM) for microwave wireless power transfer applications. The proposed antenna has 4.9 GHz bandwidth covering the 5.8 GHz WLAN band. Defects were used to improve the bandwidth and return loss of the proposed antenna TRM with enhanced radiation suitable for wireless power transfer for off-body biomedical applications. For the antenna time reversal mirror proposed, the slots act as scatterers enhancing the performance of the antenna time reversal mirror with transforming structures. The proposed antenna is designed on a microwave substrate of relative permittivity of 2.65 having a loss tangent of 0.003. It has a compact size of 30mm by 28mm. A rectangular bracket shaped slot was etched on the circular patch to improve its return loss with a maximum return loss of -55dB, better than -10dB with impedance bandwidth of 3.67-8.57 GHz and improved radiation pattern. Square slots were also etched on the partial ground plane of the proposed antenna.
提出了一种用于微波无线功率传输的圆形微带贴片天线时间反转镜的设计。该天线具有4.9 GHz带宽,覆盖5.8 GHz WLAN频段。利用缺陷提高了天线TRM的带宽和回波损耗,增强了辐射,适用于离体生物医学应用的无线电力传输。对于所提出的天线时间反转镜,槽作为散射体,通过变换结构增强了天线时间反转镜的性能。该天线设计在相对介电常数为2.65,损耗正切为0.003的微波衬底上。它具有30mm × 28mm的紧凑尺寸。在圆形贴片上蚀刻矩形支架形状的缝隙,改善其回波损耗,最大回波损耗为-55dB,优于-10dB,阻抗带宽为3.67 ~ 8.57 GHz,改善了辐射方向图。在天线的部分接地面上也蚀刻了方槽。
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引用次数: 0
Investigating the Optimal Location of FACTS Devices in Power System Networks with Renewable Energy Sources considering uncertainty 考虑不确定性的可再生能源电网FACTS设备最优配置研究
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570923
W. Masamvu, O. Dzobo
Reactive power flow analysis is an essential feature of power systems management. Controlling the amounts of reactive power flowing in and out of a power system network aids in keeping network voltage within acceptable limits. As the penetration of renewable energy sources (RESs) into the conventional electric grid increases, its effect on reactive power must be investigated. Research studies have shown that the uncertainty of RESs in power generation influences the reactive power of a power system network and consequently its overall transmission losses. This influence can be mitigated by installing FACTS devices in the power system network. In this research paper, a case study is presented to determine the best location of Flexible Alternating Current Transmission System (FACTS) devices in a power system network with RESs. The uncertainty of load and wind power generation is modelled using probabilistic scenario-based method. The IEEE 14 bus test network is used in the analysis. The objective function is solved using the particle swarm optimization (PSO) algorithm. The results show that when FACTS devices are strategically positioned in a power system network and uncertainty is considered, they have a significant influence on the overall transmission loss of the network.
无功潮流分析是电力系统管理的一个重要特征。控制流入和流出电力系统网络的无功功率量有助于将网络电压保持在可接受的范围内。随着可再生能源对传统电网的渗透增加,必须研究其对无功功率的影响。研究表明,发电过程中RESs的不确定性会影响电网的无功功率,进而影响电网的整体输电损耗。这种影响可以通过在电力系统网络中安装FACTS设备来减轻。本文以柔性交流输电系统(FACTS)为研究对象,讨论了柔性交流输电系统(FACTS)设备在具有RESs的电网中的最佳位置。采用基于概率场景的方法对负荷和风力发电的不确定性进行建模。分析中采用了ieee14总线测试网络。采用粒子群优化算法求解目标函数。研究结果表明,在考虑不确定性的情况下,FACTS设备在电网中的战略位置对电网的整体传输损耗有显著影响。
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引用次数: 0
Finite Element Design and Multi-objective Optimization of Four Pole Reluctance Motor Based on NSGA-II Intelligent Algorithm 基于NSGA-II智能算法的四极磁阻电机有限元设计与多目标优化
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570964
E. C. Abunike, O. Okoro, I. Davidson
The design of a four-pole reluctance motor with multiple objectives is discussed in this paper using a finite element design methodology based on multi-objective genetic algorithm. Non-dominated genetic algorithm (NSGA-II) is used because of its high performance and intensification in optimization problems. The global sensitivity chart revealed that the motor’s stator pole embrace and yoke thickness are key parameters for the optimization objectives, while the rotor’s pole embrace should be restrained and closely associated with these two key parameters. According to the optimization and sensitivity analysis results, a final design which is superior to the base design was achieved. There were 15 % and 13.2 % improvement in the optimized model in terms of the average torque and efficiency respectively. Also, the optimized model recorded a reduction in the average torque ripple and total loss by 1.55 % and 30.1 % respectively. This demonstrates the NSGA-II intelligent optimization program is a suitable framework to optimize specified objective functions.
本文采用基于多目标遗传算法的有限元设计方法,讨论了多目标四极磁阻电机的设计问题。非支配遗传算法(NSGA-II)因其在优化问题中的高性能和集约化而被广泛应用。全局灵敏度图显示,电机定子极拥抱和轭架厚度是优化目标的关键参数,而转子极拥抱应受到约束并与这两个关键参数密切相关。根据优化和灵敏度分析结果,得出了优于基本设计的最终设计方案。优化后的模型在平均转矩和效率方面分别提高了15%和13.2%。此外,优化模型记录的平均转矩脉动和总损失分别减少了1.55%和30.1%。这表明NSGA-II智能优化程序是优化指定目标函数的合适框架。
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引用次数: 3
Arc Parameters and Fault Impedance effect on the Gradient of Arc Current and Rate of Rise of Recovery Voltage in HVDC Circuit Breaker Using Mayr Arc Model. 用Mayr电弧模型研究了电弧参数和故障阻抗对高压直流断路器电弧电流梯度和恢复电压上升速率的影响。
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570846
Mohamed N. Elfikky, A. El-Morshedy, M. El-Shahat
The gradient of Arc Current (di/dt) and rate of rise of recovery voltage (RRRV) are used to study the capability of circuit breaker (CB) to interrupt different faults. The current interruption mechanism in high voltage direct current (HVDC) CB is complicated and needs an auxiliary circuit to generate current zero crossing. Mayr Arc Model is used to simulate the arc current interruption process. The effects of arc model parameters, arc time constant (τ) and cooling power (P), on di/dt and RRRV are presented in this work. It is found that the lower di/dt will appear at higher Arc time constant and lower cooling power values, but with limits. Contrary to di/dt, RRRV has lower values at low arc time constant values and high cooling power values, but Mayr arc model parameters have greater effect on di/dt than RRRV. This paper also addresses the effect of three types of fault impedance (resistive, inductive and capacitive) on di/dt and RRRV. A comparison is carried out for these fault impedances and shows good performance for capacitive impedance.
采用电弧电流梯度(di/dt)和恢复电压上升速率(RRRV)来研究断路器对不同故障的中断能力。高压直流断路器的断流机制复杂,需要辅助电路来产生过零电流。采用迈尔电弧模型模拟电弧电流中断过程。研究了电弧模型参数、电弧时间常数τ和冷却功率P对di/dt和RRRV的影响。在较高的电弧时间常数和较低的冷却功率值时,会出现较低的di/dt,但有一定的限制。与di/dt相反,RRRV在低电弧时间常数值和高冷却功率值时具有较低的数值,但Mayr电弧模型参数对di/dt的影响大于RRRV。本文还讨论了三种类型的故障阻抗(电阻、电感和电容)对di/dt和RRRV的影响。对这些故障阻抗进行了比较,表明电容阻抗具有良好的性能。
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引用次数: 0
Interference Management upon Collaborative Beamforming in a Wireless Sensor Network Monitoring System featuring Multiple Unmanned Aerial Vehicles 多无人机无线传感器网络监控系统协同波束形成干扰管理
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570907
Robert Macharia, K. Langat, P. Kihato
Collaborative beamforming (CBF) has been proposed as a viable tool towards increasing node transmission range in Wireless Sensor Networks (WSNs). This is highly essential in scenarios featuring highly elevated airborne sinks (Unmanned Aerial Vehicles (UAVs)) where multi-hop transmission is inconceivable. CBF yields radiation in unintended directions (sidelobes). A high sidelobe is bound to lead to interference at an UAV in the sidelobe’s direction (taking into consideration a case of multiple and mobile UAV sinks). A direct consequence of increased interference is reduction in communication capacity at the affected UAV. This paper presents a generalized sidelobe minimization scheme using Gravitational Search Algorithm (GSA). The effect of sidelobe minimization on the communication capacity at unintended UAVs is analyzed. Appreciable capacity increase is observed in comparison to a scheme featuring peak sidelobe minimization only.
协同波束形成(CBF)被认为是增加无线传感器网络(WSNs)节点传输距离的可行工具。这在具有高架机载水槽(无人驾驶飞行器(uav))的场景中是非常必要的,因为多跳传输是不可想象的。CBF产生非预期方向的辐射(旁瓣)。高旁瓣必然会导致无人机在旁瓣方向上的干扰(考虑到多个移动的无人机接收器的情况)。增加干扰的一个直接后果是受影响无人机的通信能力减少。提出了一种基于引力搜索算法(GSA)的广义旁瓣最小化方案。分析了副瓣最小化对非预期无人机通信能力的影响。与仅具有峰值旁瓣最小化的方案相比,观察到明显的容量增加。
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引用次数: 3
Wireless sensor network for water pipe corrosion monitoring 用于水管腐蚀监测的无线传感器网络
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9571008
Jacobus Kampman, Judas Masela, T. Joubert
The development of accurate corrosion models from corrosion data is a key requirement for well informed, preemptive actions towards extending the life of water infrastructure systems and reducing maintenance costs. This work presents the development of a custom proof-of-concept system implementation performing water corrosion monitoring using custom integrated corrosion sensing technologies powered by energy harvested through an in-line turbine generator. Implementing a star topology network of wireless corrosion sensor nodes distributed through water infrastructure systems offers an innovative solution for real-time and on-line monitoring of corrosion in water infrastructure systems. The wireless sensor network includes a wireless access point that provides an interface for retrieval of the corrosion data and a nexus for communications. A low-power bidirectional data transfer communications protocol using a form of time-division multiplex access is designed and implemented towards the optimisation of energy efficiency in the network. In an emulated pipeline field setup, the energy harvested and stored provides 125.80 mWh at 4.89 V for an in-pipe flow rate of 13.25 l/min, a typical value for municipal potable water supply in South Africa. The local node ER sensor can of measure changes in resistance values to an accuracy of 1% and will be usable in-system for a year. The access point implements EIS and LPR sensing. The extracted LPR value predicts a corrosion rate is 63.0 um/year in potable water.
从腐蚀数据中开发准确的腐蚀模型是延长水基础设施系统使用寿命和降低维护成本的关键要求。这项工作展示了一种定制的概念验证系统的开发,该系统使用定制的集成腐蚀传感技术,由在线涡轮发电机收集的能量提供动力,执行水腐蚀监测。实现分布在供水基础设施系统中的无线腐蚀传感器节点星形拓扑网络,为实时在线监测供水基础设施系统的腐蚀提供了一种创新的解决方案。无线传感器网络包括一个无线接入点,该接入点提供用于检索腐蚀数据的接口和用于通信的连接。为了优化网络中的能源效率,设计并实现了一种使用时分多路接入形式的低功耗双向数据传输通信协议。在模拟管道现场设置中,收集和储存的能量在4.89 V下提供125.80 mWh,管内流速为13.25 l/min,这是南非市政饮用水供应的典型值。本地节点ER传感器可以测量电阻值的变化,精度为1%,并将在系统中使用一年。接入点实现EIS和LPR感知。提取的LPR值预测饮用水中的腐蚀速率为63.0 um/年。
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引用次数: 1
A Nash Equilibrium Approach based on Differential Evolution to Probit Classification 基于差分进化的概率分类纳什均衡方法
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570848
R. Lung
The possibility of enhancing the performance of the Probit classification model by adding a game theoretic flavour to the model parameters is explored in this paper. A game in which each attribute of the data set represents a player choosing its parameter is devised. The Nash equilibrium of this game is approximated by using a Differential Evolution algorithm. Numerical examples illustrate the potential of this approach.
本文探讨了通过在模型参数中加入博弈论元素来提高Probit分类模型性能的可能性。设计了一种游戏,其中数据集的每个属性代表玩家选择其参数。该博弈的纳什均衡是用一种差分进化算法逼近的。数值例子说明了这种方法的潜力。
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引用次数: 0
Strategic Considerations of Industry 4.0 on Electronic Warfare using Technology Roadmaps 利用技术路线图对工业4.0电子战的战略考虑
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570921
Reeshen Reddy
The Fourth Industrial Revolution or Industry 4.0 is an ongoing industrial revolution brought about by several emerging technologies expected to disrupt most business sectors. The effect of Industry 4.0 on the Electronic Warfare (EW) sector is strategically analyzed using Technology Road Mapping (TRM). An enhanced TRM is proposed based on the fast-start TRM method that incorporates an additional military capability layer to assess the linkage between market trends and products. The enhanced TRM is applied to analyze trends, capability, product, technology, research, and resources.The TRM-based strategic analysis reveals that Industry 4.0 will create both market pull and technology push driving the required characteristics of future EW Products. The market pull effects will drive future EW products to operate in a battlespace supporting Multi-Domain Operations (MDO) and Decision Centric Warfare (DCW). Industry 4.0 will drive commercial demand for spectrum resulting in contested, congested, and shared spectrum. Advances in smart industries will facilitate prototype warfare and the Internet of Military Things (IoMT), increasing ad-hoc bespoke non-traditional threats. Traditional threats will support DCW supported by several unmanned platform concepts.Technology push effects will advance key technologies that will shape future EW products such as Artificial Intelligence (A.I), Cyber-Physical Systems (CPS), Internet of Things (IoT), and Heterogeneous Processing. Finally, we conclude that the emergent properties of future EW products will be cognitive, distributed, networked, coordinated, multi-spectral, reduced size, weight, and power (SWAP), and modular using open architectures.
第四次工业革命或工业4.0是一场正在进行的工业革命,由几种新兴技术带来,预计将颠覆大多数商业领域。利用技术路线图(TRM)对工业4.0对电子战(EW)领域的影响进行了战略分析。在快速启动TRM方法的基础上,提出了一种增强的TRM方法,该方法结合了额外的军事能力层来评估市场趋势与产品之间的联系。增强的TRM用于分析趋势、能力、产品、技术、研究和资源。基于trm的战略分析表明,工业4.0将创造市场拉动和技术推动,推动未来电子战产品所需的特性。市场拉动效应将推动未来电子战产品在支持多域作战(MDO)和决策中心战(DCW)的作战空间中运行。工业4.0将推动对频谱的商业需求,从而导致频谱的竞争、拥塞和共享。智能工业的进步将促进原型战争和军事物联网(IoMT),增加临时定制的非传统威胁。传统威胁将支持DCW,由几个无人平台概念支持。技术推动效应将推动关键技术的发展,这些技术将塑造未来的电子战产品,如人工智能(A.I)、网络物理系统(CPS)、物联网(IoT)和异构处理。最后,我们得出结论,未来电子战产品的新兴特性将是认知、分布式、网络化、协调、多光谱、小型化、轻量化和低功耗(SWAP),以及采用开放式架构的模块化。
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引用次数: 1
Small-Scale Farmers’ Awareness of e-Agriculture: A Pathway for Livelihood Development in Mkuranga, Tanzania 坦桑尼亚姆库兰加小农对电子农业的认识:一条生计发展之路
Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570889
Ezra Misaki
True agricultural development heavily relies on the promptness and relevance of the information accessed by small-scale farmers. In this regard, the application of e- Agriculture has a huge potential and pathway for agricultural development. e-Agriculture facilitates the exchange of farming information, ideas, and resources that if practiced can improve productivity and livelihood. Information exchanged improves small-scale farmers' decision-making in the agricultural value chain and hence pathway in welfare development. Despite this potentiality of e-Agriculture, the literature on the assessment of the level of farmers’ awareness of the technology in Mkuranga is scanty. Therefore, using a quantitative survey design to 63 small-scale farmers, focusing on the dimensions attitude, impact, social-cultural inhibitions of using mobile technology and competence in using mobile technologies, this study found out that 81.0 and 87.3 per cent of the respondents were unaware of the existence of e-Agriculture and information and communication technology projects in the study area. Further, 76.2 per cent of small-scale farmers studied opined that such projects could enhance agriculture in future if well established. The study also found that information and communication technologies such as M-Pesa, Tigo-Pesa, and AirTel money services positively impacted the farming business. The study also found out that the social-cultural aspect was not inhibiting the scaling up of technology usage in the rural sector. Moreover, it was found that the competencies of farmers were low, indicating the low awareness of the technology. Thus, the study's findings provide insights on enhancing the use of e-Agriculture in the farming business and policy formulation in the agricultural sector.
真正的农业发展在很大程度上依赖于小农获取信息的及时性和相关性。在这方面,电子农业的应用具有巨大的潜力和农业发展的途径。电子农业促进了农业信息、思想和资源的交流,如果付诸实践,可以提高生产力和生计。信息交换改善了小农在农业价值链上的决策,从而改善了福利发展的路径。尽管电子农业具有这种潜力,但关于评估Mkuranga农民对该技术的认识水平的文献很少。因此,采用定量调查设计,以63小农,重点维度态度,影响,使用移动技术的社会文化抑制和使用移动技术的能力,本研究发现,81.0%和87.3%的受访者不知道电子农业和信息通信技术项目的存在在研究区域。此外,接受研究的76.2%的小农认为,如果这些项目建立良好,将来可以促进农业。该研究还发现,信息和通信技术,如M-Pesa、Tigo-Pesa和AirTel货币服务,对农业产生了积极影响。研究还发现,社会文化方面并没有阻碍农村部门扩大技术使用。此外,发现农民的胜任力较低,表明对该技术的认识较低。因此,研究结果为在农业经营和农业部门政策制定中加强电子农业的使用提供了见解。
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引用次数: 2
期刊
2021 IEEE AFRICON
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