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Comparative analysis and validation of advanced control modules for standalone renewable micro grid with droop controller 带下垂控制器的独立可再生微电网高级控制模块的比较分析和验证
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.5849
Savitri Swathi, Bhaskaruni Suresh Kumar, Jalla Upendar
A micro grid system with renewable source operation control is a complex part as each source operates at different parameters. This renewable micro grid with multiple sources like solar plants, wind farm, fuel cell, battery backup has to be operated in both grid connected and standalone condition. During grid connection the micro grid, inverter has to inject power to the grid and compensate load in synchronization to the grid voltages. And during standalone condition the inverter is controlled with droop control module which stabilizes the voltage and frequency of the system even during grid disconnection. The droop control module is further updated with new advanced controllers like fuzzy inference system (FIS) and adaptive neuro-fuzzy inference system (ANFIS) replacing the traditional proportional integral derivative (PID) and proportional integral (PI) controllers improving the response rate and for achieving better stabilization. This paper has comparative analysis of the micro grid system with different droop controllers under various operating conditions. Parameters like voltage magnitude (Vmag), frequency (F), load and inverter powers (Pload and Pinv) of the test system are compared with different controllers. A numeric comparison table is given to determine the optimal controller for the inverter operation. The analysis is carried out in MATLAB/Simulink software with graphical and parametric validations.
带有可再生能源运行控制的微电网系统是一个复杂的部分,因为每种可再生能源的运行参数都不同。这种可再生能源微电网有多种来源,如太阳能发电厂、风力发电场、燃料电池、备用电池等,必须在并网和独立状态下运行。在并网期间,微型电网的逆变器必须向电网注入电力,并根据电网电压同步补偿负载。而在独立运行时,逆变器由下垂控制模块控制,即使在电网断开时也能稳定系统的电压和频率。该下垂控制模块采用了新的先进控制器,如模糊推理系统(FIS)和自适应神经模糊推理系统(ANFIS),取代了传统的比例积分导数(PID)和比例积分(PI)控制器,提高了响应速度,实现了更好的稳定性。本文比较分析了微电网系统在不同运行条件下使用不同下垂控制器的情况。测试系统的电压幅值(Vmag)、频率(F)、负载和逆变器功率(Pload 和 Pinv)等参数与不同控制器进行了比较。给出了一个数字比较表,以确定逆变器运行的最佳控制器。分析在 MATLAB/Simulink 软件中通过图形和参数验证进行。
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引用次数: 0
A machine learning-based computer model for the assessment of tsunami impact on built-up indices using 2A Sentinel imageries 基于机器学习的计算机模型,利用 2A 哨兵成像评估海啸对建筑指数的影响
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.5910
Sri Yulianto Joko Prasetyo, B. H. Simanjuntak, Yeremia Alfa Susatyo, Wiwin Sulistyo
This study aims to build a computer model to detect built-up land in the identified tsunami hazard zone based on Sentinel 2A imagery using the normalized built up area index (NBI), urban index (UI), normalize difference build-up index (NDBI), a modified built-up index (MBI), index-based builtup index (IBI) algorithms, optimized with machine learning Random Forest (RF) and extreme gradient boosting (XGboost) algorithms and the spatial patterns are predicted using the ordinary kriging (OK) method. Testing of the accuracy of the classification and optimization results was performed using the Kohen Kappa and overall accuracy functions. The results of the study show that a built-up land consisting of open land and water, settlements, industry areas, and agriculture and tourism areas can be identified using the parameters of built-up indices. The accuracy testings that were performed using overall accuracy and Kohen Kappa methods show that classification and prediction are highly accurate using XGboost machine learning, namely 91%. This study produces a novelty of finding, namely a computer model to detect and predict the spatial distribution of built-up land in 4 scales, i.e., very low, low, high, and very high based on NBI, UI, NDBI, MBI, IBI data extracted from Sentinel 2A imagery.
本研究旨在根据哨兵 2A 图像建立一个计算机模型,使用归一化建成区指数(NBI)、城市指数(UI)、归一化差异建成区指数(NDBI)、修正建成区指数(MBI)、基于指数的建成区指数(IBI)算法检测已确定的海啸危险区中的建成区,并使用机器学习随机森林(RF)和极端梯度提升(XGboost)算法进行优化,使用普通克里金(OK)方法预测空间模式。使用 Kohen Kappa 和总体准确率函数对分类和优化结果的准确性进行了测试。研究结果表明,使用建成区指数参数可以识别由空地和水域、居民点、工业区以及农业和旅游区组成的建成区。使用总体准确率和 Kohen Kappa 方法进行的准确率测试表明,使用 XGboost 机器学习进行分类和预测的准确率很高,达到 91%。这项研究有一项新发现,即基于从哨兵 2A 图像中提取的 NBI、UI、NDBI、MBI 和 IBI 数据,建立了一个计算机模型,用于检测和预测 4 个尺度(即极低、低、高和极高)的建成区空间分布。
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引用次数: 0
Intelligent agriculture system using low energy and based on the use of the internet of things 基于物联网的低能耗智能农业系统
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6346
Kamal Elhattab, Karim Abouelmehdi
The field of smart agriculture is ranked among the top areas that uses the internet of things (IoT), whose goal is to increase the quantity and quality of agricultural productivity. The aim of this work is to realize a new device that will be cost-effective, reliable, and autonomous using a solar panel to provide electricity in large-scale agricultural fields, ESP32 to interconnect IoT sensors and the long range (LoRa) data transmission protocol to guarantee connectivity in places where there is no internet, whose objective is to monitor and irrigate agricultural fields only when there is a need for water. The data received by the sensors is sent to mobile app users via the Blynk cloud. The performance of our new approach is measured in terms of energy savings. This new model of irrigation and smart monitoring will improve the efficiency of farming techniques.
智能农业领域是物联网(IoT)的主要应用领域之一,其目标是提高农业生产力的数量和质量。这项工作的目的是利用太阳能电池板为大规模农田提供电力,利用 ESP32 实现物联网传感器之间的互联,并利用长距离(LoRa)数据传输协议保证在没有互联网的地方也能实现连接,从而实现一种经济、可靠、自主的新设备,其目标是在需要用水时才对农田进行监测和灌溉。传感器接收到的数据通过 Blynk 云发送给移动应用程序用户。我们的新方法以节能为衡量标准。这种新的灌溉和智能监控模式将提高农业技术的效率。
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引用次数: 0
Bidirectional recommendation in HR analytics through text summarization 通过文本摘要在人力资源分析中进行双向推荐
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.5650
Channabasamma Arandi, Suresh Yeresime
For over a decade, online job portals have been providing their services to both job seekers and employers in search of hiring opportunities. Because of the high demand for recruitment, it is insufficient to use conventional hiring methods to find a suitable candidate to fill the position. Validating resumes online is challenging due to the potential for manual errors, making the process inherently risky. The bidirectional method comprises named entity recognition (NER) for extracting the required resumes for recruiters. Cosine similarity shows the match percentage of resumes for the job requirements and vice versa. In an attempt to tackle an issue of unregistered words, a solution called decoder attention with pointer network (DA-PN) has been introduced. This method incorporates the use of coverage mechanism to prevent word repetition through generated text summary. DA-PN+Cover method with mixed learning objective (MLO) (DA-PN+Cover+MLO) is utilized for protecting grow of increasing faults in generated text summary. Performance of proposed method is estimated using evaluation indicator recall oriented understudy for gisting evaluation (ROUGE) and attains an average of 27.47 which is comparatively higher than existing methods.
十多年来,在线招聘门户网站一直在为求职者和寻找招聘机会的雇主提供服务。由于招聘需求量大,使用传统的招聘方法不足以找到合适的候选人来填补职位空缺。在线验证简历具有一定的挑战性,因为可能会出现人工错误,从而使验证过程存在固有风险。双向方法包括命名实体识别(NER),用于提取招聘人员所需的简历。余弦相似度显示简历与职位要求的匹配率,反之亦然。为了解决未注册词的问题,引入了一种称为带指针网络的解码器注意(DA-PN)的解决方案。这种方法结合使用了覆盖机制,通过生成的文本摘要来防止单词重复。DA-PN+Cover 方法与混合学习目标(MLO)(DA-PN+Cover+MLO)相结合,用于保护生成的文本摘要中不断增加的错误。所提方法的性能是用面向召回的分类评价(ROUGE)这一评价指标来估算的,其平均值为 27.47,相对高于现有方法。
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引用次数: 0
Effects of processing parameters on the leakage current of silicone rubber insulator 加工参数对硅橡胶绝缘体泄漏电流的影响
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6070
Nornazurah Nazir Ali, Hidayat Zainuddin, J. Abd Razak, Rahisham Abd-Rahman, N. F. Ambo
Silicone rubber (SiR) is known for its exceptional electrical insulation properties. The performance of SiR could be affected by many factors, including processing parameters, particularly mixing speed and time. While these parameters are crucial for ensuring the homogeneity of blended polymeric materials, their electrical impact remains relatively unexplored. This research investigates the effect of varying processing parameters on SiR samples during rapid aging under the incline plane tracking (IPT) test. The study unfolds in three phases, with the final IPT stage revealing the significant influence of different mixing speeds and times on the recorded leakage current (LC) values for each sample. Sample 2, subjected to 70 rpm mixing speed and 10 minutes of mixing time, exhibited great resistance to tracking and erosion. Fourier transform infrared spectroscopy (FTIR) was conducted on the samples before and after the IPT test to further analyze the impact of the varying processing parameters. Once again, sample 2 displayed notable resilience, demonstrating lower reductions in absorbance values for key functional groups. In conclusion, the specific processing parameters of 70 rpm and 10 minutes have been shown to positively influence the performance of SiR, enhancing their resistance to tracking and erosion during rapid aging.
硅橡胶(SiR)以其优异的电气绝缘性能而闻名。硅橡胶的性能会受到许多因素的影响,包括加工参数,尤其是混合速度和时间。虽然这些参数对确保混合聚合物材料的均匀性至关重要,但它们对电学的影响相对来说仍有待探索。本研究调查了在斜面跟踪(IPT)测试下快速老化过程中不同加工参数对 SiR 样品的影响。研究分三个阶段进行,最后的 IPT 阶段揭示了不同混合速度和时间对每个样品记录的泄漏电流 (LC) 值的显著影响。样品 2 在 70 转/分的搅拌速度和 10 分钟的搅拌时间下表现出很强的抗跟踪和抗侵蚀能力。在 IPT 测试前后对样品进行了傅立叶变换红外光谱分析,以进一步分析不同加工参数的影响。样品 2 再次显示出显著的复原性,其关键官能团的吸光度值降低较少。总之,70 转/分钟和 10 分钟的特定加工参数对 SiR 的性能产生了积极影响,增强了它们在快速老化过程中的抗跟踪和抗侵蚀能力。
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引用次数: 0
Miniaturization of antenna using metamaterial loaded with CSRR for wireless applications 利用加载 CSRR 的超材料实现无线应用天线的微型化
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6362
S. Pande, Dipak P. Patil
This paper proposes a compact decagon antenna for wireless applications based on inspired metamaterial (MTM) loaded with a modified complementary split ring resonator (CSRR). A MTM loaded with CSRR is used to achieve a size reduction of 50% when compared to a traditional antenna. The suggested decagon antenna's ground plane has been loaded with CSRR. The antenna was made on an FR4 substrate with a thickness of 1.6 mm and εr=4.4 and has a very small dimension of 0.288 λ_0x0.272 λ_0x0.013 λ_0 (where λ_0 represent center frequency at 2.4 GHz). The given antenna has a 90 MHz bandwidth (2.40-2.50 GHz) with a peak gain of 2.36 dB. The presented design is validated by showing simulated results of the S parameter, VSWR, gain, surface current, and radiation pattern. The proposed antenna is well suited for wireless applications.
本文提出了一种用于无线应用的紧凑型十角天线,它基于加载了改进型互补分环谐振器(CSRR)的灵感超材料(MTM)。与传统天线相比,加载了 CSRR 的 MTM 可使尺寸缩小 50%。建议的十角形天线的地平面已加载 CSRR。天线是在厚度为 1.6 毫米、εr=4.4 的 FR4 基板上制作的,尺寸非常小,仅为 0.288 λ_0x0.272 λ_0x0.013 λ_0(其中 λ_0 代表 2.4 GHz 的中心频率)。所给天线的带宽为 90 MHz(2.40-2.50 GHz),峰值增益为 2.36 dB。通过显示 S 参数、驻波比、增益、表面电流和辐射模式的模拟结果,验证了所提出的设计。所提出的天线非常适合无线应用。
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引用次数: 0
Microstrip antenna with reflector and air gap for short range communication in 900 MHz band 用于 900 MHz 波段短距离通信的带反射器和气隙的微带天线
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.5515
N. Shairi, Zahriladha Zakaria, Imran Mohd Ibrahim, Anwar Faizd Osman
This paper proposes a microstrip antenna that was made of a microstrip fed slot with a complimentary stub on a single dielectric medium. This antenna was integrated with a reflector and air gap for the application of short range communication (SRC) in a 900 MHz band. Analyses were made on the dimension of the reflector and the height of the air gap towards the antenna performance. Besides, an antenna field test was done for the propagation distance of the proposed antenna. As a result, with the antenna size of 13,770 mm2 , the measured return loss was -10.79 dB and the directivity gain was 7.44 dBi. Besides, with the effective isotropic radiated power (EIRP) of 7.44 dBm, it was predicted that at 100 m, the received signal would be around 60 to 70 dBm. Therefore, a high gain was produced by using a reflector with air gap and a compact size was achieved if compared to conventional high gain antenna designs such as Yagi Uda. Thus, it is suitable for a communication device such as the SRC application.
本文提出了一种微带天线,它是由单介质介质上的微带馈电槽和赠送的存根组成。该天线与反射器和气隙集成,用于 900 MHz 频段的短距离通信(SRC)。研究分析了反射器的尺寸和气隙的高度对天线性能的影响。此外,还对拟议天线的传播距离进行了天线现场测试。结果表明,天线尺寸为 13,770 mm2 时,测量回波损耗为 -10.79 dB,指向性增益为 7.44 dBi。此外,根据 7.44 dBm 的有效各向同性辐射功率(EIRP)预测,100 米处的接收信号约为 60 至 70 dBm。因此,与八木宇田等传统的高增益天线设计相比,通过使用带气隙的反射器产生了高增益,并实现了小型化。因此,它适用于类似 SRC 应用的通信设备。
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引用次数: 0
Predicting lung cancer risk using explainable artificial intelligence 利用可解释人工智能预测肺癌风险
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6280
Shahin Shoukat Makubhai, Ganesh R. Pathak, Pankaj R. Chandre
Lung cancer is a lethal disease that claims numerous lives annually, and early detection is essential for improving survival rates. Machine learning has shown promise in predicting lung cancer risk, but the lack of transparency and interpretability in black-box models impedes the understanding of factors that contribute to risk. Explainable artificial intelligence (XAI) can overcome this limitation by providing a clear and understandable approach to machine learning. In this study, we will use a large patient record dataset to train an XAI-based model that considers various patient information, including lifestyle factors, clinical data, and medical history, for predicting lung cancer risk. We will use different XAI techniques, including decision trees, partial dependence plots, and feature importance, to interpret the model’s predictions. These methods will provide healthcare professionals with a transparent and interpretable framework for screening and treatment decisions concerning lung cancer risk.
肺癌是一种致命疾病,每年夺去无数人的生命,而早期检测对于提高存活率至关重要。机器学习在预测肺癌风险方面大有可为,但黑盒模型缺乏透明度和可解释性,妨碍了人们对导致风险的因素的理解。可解释人工智能(XAI)通过提供一种清晰易懂的机器学习方法,可以克服这一局限性。在本研究中,我们将使用一个大型患者记录数据集来训练一个基于 XAI 的模型,该模型考虑了患者的各种信息,包括生活方式因素、临床数据和病史,用于预测肺癌风险。我们将使用不同的 XAI 技术(包括决策树、偏倚图和特征重要性)来解释模型的预测结果。这些方法将为医疗保健专业人员提供一个透明、可解释的框架,用于肺癌风险筛查和治疗决策。
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引用次数: 0
Image dermoscopy skin lesion classification using deep learning method: systematic literature review 利用深度学习方法进行图像皮肤镜皮损分类:系统性文献综述
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6077
Arief Kelik Nugroho, Retantyo Wardoyo, Moh Edi Wibowo, H. Soebono
Classifying skin lesions poses a significant challenge due to the distinctive characteristics and diverse shapes they can exhibit, particularly in identifying early-stage melanoma. To address the shortcomings of the prior method, a neural network-driven strategy was introduced to differentiate between two types of skin lesions based on dermoscopic images. This new approach comprises four key stages: i) initial image processing, ii) skin lesion segmentation, iii) feature extraction, and iv) classification using deep neural networks (DNNs). Computers can also provide more accurate diagnosis results. In the review process, the articles are analyzed and summarized to contribute to developing methods or application development in skin lesion diagnosis. The stages include defining the relevant theory, input data, methods used (architecture and modules), training process, and model evaluation. This review also explores information based on trends and users, emphasizing the skin lesion segmentation process, skin lesion classification process, and minimal datasets as recommendations for future research.
由于皮肤病变可能表现出独特的特征和不同的形状,因此对皮肤病变进行分类是一项重大挑战,尤其是在识别早期黑色素瘤方面。针对先前方法的不足,我们引入了一种神经网络驱动策略,根据皮肤镜图像区分两种类型的皮肤病变。这种新方法包括四个关键阶段:i) 初始图像处理;ii) 皮肤病变分割;iii) 特征提取;以及 iv) 利用深度神经网络(DNN)进行分类。计算机还能提供更准确的诊断结果。在综述过程中,对文章进行分析和总结,以促进皮损诊断方法或应用的开发。这些阶段包括定义相关理论、输入数据、所用方法(架构和模块)、训练过程和模型评估。本综述还根据趋势和用户情况探讨了相关信息,强调了皮损分割过程、皮损分类过程和最小数据集,并以此作为未来研究的建议。
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引用次数: 0
FPGA implementation of DTCWT architecture's high-speed DA structure for OFDM-based transceiver with CS 为带 CS 的基于 OFDM 的收发器实现 DTCWT 架构的高速 DA 结构的 FPGA
Q2 Mathematics Pub Date : 2024-04-01 DOI: 10.11591/eei.v13i2.6543
Anuapam Sindgi, U. B. Mahadevaswamy
Communication systems at millimeter-wave (mm-wave) frequencies with high propagation losses use radio frequency (RF) budget analysis. RF system gains and losses ensure the receiver can recover the broadcast signal. Modern communication systems use compressive sensing (CS) and discrete wavelet transform (DWT). Hardware implementation is hard. Fieldprogrammable gate arrays (FPGA) adaptability, configurability, and processing speed make them popular. More mm-wave transceivers use FPGAs and advanced signal processing. FPGA-based mm-wave transceivers use compressed sensing and dual-tree complex wavelet transform (DTCWT). RF budget analysis recovers receiver signals. Energy and data efficiency transceivers have baseband processors, transmitters, and receivers. RF-to-mm-wave transmitter. Receiver demodulation and baseband conversion. CS and DTCWT processing modules boost baseband signal processing 5 Gbps Xilinx virtex-6 FPGAs. The system retrieves the signal while conserving power, according to simulations and testing. This study found that FPGA-based mm-wave transceivers can use advanced signal processing in future high-speed communication systems.
毫米波(mm-wave)频率下的通信系统具有较高的传播损耗,需要进行射频(RF)预算分析。射频系统增益和损耗可确保接收器能够恢复广播信号。现代通信系统使用压缩传感(CS)和离散小波变换(DWT)。硬件实现很难。现场可编程门阵列(FPGA)的适应性、可配置性和处理速度使其大受欢迎。越来越多的毫米波收发器使用 FPGA 和先进的信号处理技术。基于 FPGA 的毫米波收发器使用压缩传感和双树复小波变换 (DTCWT)。射频预算分析可恢复接收器信号。能源和数据效率收发器具有基带处理器、发射器和接收器。射频至毫米波发射机。接收器解调和基带转换。CS 和 DTCWT 处理模块提升了 5 Gbps Xilinx virtex-6 FPGA 的基带信号处理能力。根据模拟和测试结果,该系统在检索信号的同时还节省了功耗。这项研究发现,基于 FPGA 的毫米波收发器可在未来的高速通信系统中使用先进的信号处理技术。
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引用次数: 0
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Bulletin of Electrical Engineering and Informatics
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