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Sliding mode control design for the attitude and altitude of the quadrotor UAV 四旋翼无人机姿态和高度的滑模控制设计
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-011
A. Eltayeb, M. F. Rahmat, M. Basri
Abstract Recently, the quadrotor unmanned aerial vehicles (UAV) are attracting significant interest from researchers due to its widespread applications, which involve the civilian and military sectors. In this paper, a robust sliding mode control (SMC) algorithm is designed to stabilize the attitude and track the altitude of quadrotor UAV. The switching function in the SMC control law has been replaced by the error function to reduce the chattering influences. The chattering phenomenon is induced by the parameter uncertainties and external disturbances and results in critical issues, for instance, the vibration in the mechanical components. The simulation results of the traditional SMC and feedback linearization (FBL) are used as the benchmark to test and evaluate the performance of the proposed SMC, which proved that the proposed controller outperforms the traditional SMC and FBL controllers.
近年来,四旋翼无人机(UAV)由于其广泛的应用而引起了研究人员的极大兴趣,它涉及民用和军事领域。针对四旋翼无人机的姿态稳定和高度跟踪问题,设计了一种鲁棒滑模控制算法。用误差函数代替了SMC控制律中的开关函数,减小了抖振的影响。抖振现象是由参数的不确定性和外界干扰引起的,并导致机械部件的振动等关键问题。以传统SMC和反馈线性化(FBL)的仿真结果为基准,测试和评价了所提控制器的性能,证明了所提控制器优于传统SMC和FBL控制器。
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引用次数: 2
The Discriminant Analysis Approach for Evaluating Effectiveness of Learning in an Instructor-Led Virtual Classroom 教师主导的虚拟课堂学习效果评价的判别分析方法
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-035
D. Magdalene Delighta Angeline, P. Ramasubramanian, I. Samuel Peter James
Abstract The effective learning requires putting down various associations of new ideas to old ones to integrate some innovative thoughts. The learners must change the associations among the things they already know, or even reject some long-held attitude about the world. The choice to the essential reformation is to deform the new information to fit their old ideas or to reject the new information entirely. Learners come to the classroom with their own ideas, some may be correct and some may not be, concerning roughly each topic they are expected to come across. If their perception and misunderstanding are unnoticed or discharged out of control, it affects the learning of a learner. The learners must be encouraged to build up new observation by seeing how such observation helps them make better sense of the world. The objective of this research paper is to put down the fundamentals of learning that promotes effective learning in an instructor-led virtual classroom and to analyze the learners’ learning performance using the Discriminant Analysis, a data mining technique. The Discriminant Analysis uses statistically significant determinants to predict learners’ learning in a classroom.
有效的学习需要放下新旧观念的各种联想,整合一些创新的思想。学习者必须改变他们已经知道的事物之间的联系,甚至摒弃一些长期持有的对世界的态度。本质改革的选择要么是将新信息变形以适应旧观念,要么是完全拒绝新信息。学生带着自己的想法来到教室,有些可能是正确的,有些可能不是,大致涉及他们预计会遇到的每个主题。如果他们的认知和误解不被注意或失控地释放出来,就会影响学习者的学习。必须鼓励学习者通过观察这些观察如何帮助他们更好地理解世界来建立新的观察。本研究论文的目的是提出在教师主导的虚拟课堂中促进有效学习的学习基础,并使用判别分析(一种数据挖掘技术)分析学习者的学习表现。判别分析使用统计上显著的决定因素来预测学习者在课堂上的学习。
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引用次数: 1
Development of an automated water management system in orchards in southern Thailand 泰国南部果园自动化水管理系统的开发
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-025
Panjit Musik
Abstract Traditional agriculture-based orchards often encounter quality problems that do not meet the market demand. Technology development is required for increasing the quality of the production and reducing the production costs. The objective of this research is to develop an automated water management system to improve production in orchards and implementing them in the field. The proposed water management system contains the equipment for water supply systems, automatic measurement, and control systems. The system was developed first inside a demonstration fruit garden. Afterward, a set of water management systems was installed in the mangosteen and durian gardens of farmers, and the system was controlled via mobile phones. The results are promising and showed that the proposed system might be useful for reducing production costs by reducing labor, water, and electricity costs. Moreover, the farmers were able to produce a higher amount of quality products in Nakhon Si Thammarat Province.
摘要传统的农业果园经常遇到质量问题,不能满足市场需求。为了提高生产质量和降低生产成本,需要进行技术开发。这项研究的目的是开发一种自动化的水管理系统,以提高果园的产量,并在田间实施。拟建的水管理系统包括供水系统、自动测量和控制系统的设备。该系统首先在一个示范果园内开发。之后,在农民的山竹和榴莲花园里安装了一套水管理系统,该系统通过手机进行控制。结果是有希望的,并表明所提出的系统可能有助于通过降低劳动力、水和电力成本来降低生产成本。此外,农民能够在呵叻省生产出更高质量的产品。
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引用次数: 2
Modeling and experimental validation of the hysteretic dynamics of shape memory alloy springs 形状记忆合金弹簧滞回动力学建模与实验验证
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2019-012
R. Abubakar, Yutian Hu, Fan Wang, Linxiang X. Wang
Abstract In this work, the hysteretic dynamics of a pseudoelastic shape memory alloy (SMA) spring is modeled and tested. A constitutive model of SMA spring is constructed by combining the theory of mechanical spring and the derived SMA constitutive relation. The SMA spring recovery force is modeled by employing the Euler–Lagrange equation based on a non-convex potential function. A macroscopic differential model is formulated to describe the hysteretic dynamics and the pseudoelasticity of the SMA spring. A theoretical method for estimating the equivalent stretch ratio at a specific temperature of SMA spring is given. Numerical simulations were presented in studying the influence of the stretch ratio at a temperature of 50, 70, and 90°C. The experimental tests are performed and presented together with their numerical counterparts. The comparison is made between numerical and experimental results to validate the proposed model for SMA spring.
摘要本文对一种伪弹性形状记忆合金(SMA)弹簧的滞回动力学进行了建模和测试。将机械弹簧理论与导出的SMA本构关系相结合,建立了SMA弹簧的本构模型。采用基于非凸势函数的欧拉-拉格朗日方程对SMA弹簧恢复力进行了建模。建立了描述SMA弹簧滞回动力学和伪弹性的宏观微分模型。给出了一种计算SMA弹簧在特定温度下等效拉伸比的理论方法。通过数值模拟研究了拉伸比在50、70和90℃温度下的影响。进行了实验测试,并提出了他们的数值对应。通过数值与实验结果的比较,验证了所建SMA弹簧模型的有效性。
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引用次数: 1
IoT enabled sensor node: a tutorial paper 支持物联网的传感器节点:教程论文
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-022
Alice James, Avishkar Seth, S. Mukhopadhyay
Abstract A descriptive guide to develop smart sensor nodes for Internet of Things (IoT) application has been presented in the paper. The current technology of low-power wide area network (LPWAN) which transmits data with low power consumption over a wide area has been illustrated in the scope of this project. An overview of the transition of IoT devices from a limited range personal area network to wide area network is justified. A sensor node has been developed and tested to validate the implementation of a LoRa network, which can be an exemplar for sensor nodes for various applications.
摘要本文介绍了为物联网(IoT)应用开发智能传感器节点的描述性指南。低功耗广域网(LPWAN)在广域上以低功耗传输数据的当前技术已在本项目的范围内进行了说明。物联网设备从有限范围的个人局域网到广域网的过渡概述是合理的。已经开发并测试了传感器节点,以验证LoRa网络的实现,该网络可以作为各种应用的传感器节点的示例。
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引用次数: 11
Compact wideband-printed antenna for sub-6 GHz fifth-generation applications 用于6 GHz以下第五代应用的紧凑型宽带印刷天线
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-033
Ankush Kapoor, Ranjan Mishra, P. Kumar
Abstract The design of a compact wideband partial slotted ground rectangular-printed antenna is presented. The design approach utilizing the slotted partial ground plane is much more flexible for improving the antenna performance. A detailed design guideline to estimate the antenna dimensions is given, which is based on mathematical and parametric analysis. The effects of variation of length of the ground and slot position in the ground plane are investigated. The simulation has been performed by using HFSS V20 simulator. The designed antenna is meant for being operated in the C band of super-high-frequency (SHF) spectrum and in the n77 band (3.3-4.2 GHz) and n78 band (3.3-3.8 GHz) of frequency range 1 (FR1) in sub-6 GHz 5G-frequency bands. The designed antenna is showing a wide bandwidth (700 MHz) with a low-reflection coefficient of −31.15 dB. The wide bandwidth and compact size of the antenna makes it suitable for use in sub-6 GHz 5G compact wireless communication systems. The measured results of the antenna prototype are firmly authenticated with simulation estimations.
介绍了一种小型宽带部分开槽矩形接地印刷天线的设计。利用开槽部分地平面的设计方法对于提高天线性能来说更加灵活。给出了基于数学和参数分析的天线尺寸估算的详细设计准则。研究了接地面长度和接地面槽位变化的影响。利用HFSS V20仿真器进行了仿真。设计的天线工作在超高频(SHF)频谱的C波段和低于6 GHz的5g频段中频率范围1 (FR1)的n77频段(3.3-4.2 GHz)和n78频段(3.3-3.8 GHz)。设计的天线具有较宽的带宽(700mhz)和低反射系数(- 31.15 dB)。该天线的宽带宽和紧凑尺寸使其适合在6 GHz以下的5G紧凑型无线通信系统中使用。天线样机的测量结果与仿真估计相吻合。
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引用次数: 23
Salt and sugar detection system using a compact microstrip patch antenna 采用紧凑型微带贴片天线的盐和糖检测系统
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-027
S. Njokweni, P. Kumar
Abstract One of the reasons for many diseases such as diabetes, stroke, high blood pressure, kidney disease, etc., is the excess consumption of salt and sugar in the diet. So, to minimize these health problems, it is important to consume appropriate quantity of salt and sugar in the diet. This paper presents the design and development of a salt and sugar detection system using a low cost compact microstrip patch antenna. The salt and sugar detection system using a compact microstrip antenna is based upon the variation of antenna parameters in the solutions of different concentrations of salt and sugar. The defected ground structure (DGS) is utilized for decreasing the size and improving the performance of the proposed microstrip patch antenna. The antenna is fed by using a microstrip line and it resonates at 2.4 GHz. The designed antenna is simulated and optimized using the computer simulation technology (CST) microwave studio. The antenna with optimized dimensions is fabricated and measured. The measurements of the return loss of the fabricated microstrip patch antenna for various solutions with different concentrations of salt and sugar are performed. The measured results confirm that the proposed compact microstrip patch antenna is suitable to detect the concentration of salt and sugar in the water. From the measured results, it is observed that the return loss of the antenna decreases, when the concentration of salt and sugar is increased. The proposed antenna is also suitable for compact 2.4 GHz wireless local area networks (WLAN) applications.
摘要糖尿病、中风、高血压、肾病等许多疾病的原因之一是饮食中过量摄入盐和糖。因此,为了最大限度地减少这些健康问题,在饮食中摄入适量的盐和糖是很重要的。本文介绍了一种使用低成本紧凑型微带贴片天线的盐和糖检测系统的设计和开发。使用紧凑型微带天线的盐和糖检测系统是基于不同浓度盐和糖溶液中天线参数的变化。缺陷接地结构(DGS)被用于减小所提出的微带贴片天线的尺寸和提高其性能。天线采用微带线馈电,谐振频率为2.4 GHz。利用计算机模拟技术(CST)微波工作室对所设计的天线进行了仿真和优化。制作并测量了具有优化尺寸的天线。对制作的微带贴片天线在不同盐和糖浓度的溶液中的回波损耗进行了测量。测量结果证实,所提出的紧凑型微带贴片天线适用于检测水中的盐和糖浓度。从测量结果中可以观察到,当盐和糖的浓度增加时,天线的回波损耗减小。所提出的天线也适用于紧凑型2.4 GHz无线局域网(WLAN)应用。
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引用次数: 10
Spectral filtering copper-coated hibiscus-butanol extract for photovoltaic cells 光电池用光谱滤波镀铜木槿-丁醇提取物
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-014
M. Emetere, Gabe-Oji Testimony
Abstract The efficiency of the photovoltaic (PV) panel was queried in this research. Past research on spectra response has shown that the maximum solar response, i.e. using color filters is 24%. This result is not very good for a PV system exposed to the harsh weather condition in any part of the African continent. In this research, the bio-filter was used to perform spectral filtering of harmful solar radiation hitting the surface of the solar PV panel. The bio-filter was synthesized from the extract of the hibiscus flower. Hibiscus is a common plant found in almost all parts of Africa. The results show that the bio-filter has a relative efficiency of 94%. This makes the product a novel to be adopted in Africa and other tropical belts to elongate the life span and performance of the solar photovoltaic panel.
摘要:本文对光伏板的效率进行了研究。过去对光谱响应的研究表明,最大的太阳响应,即使用彩色滤光片是24%。这个结果对于暴露在非洲大陆任何地方恶劣天气条件下的光伏系统来说都不是很好。在本研究中,生物过滤器用于对照射在太阳能光伏板表面的有害太阳辐射进行光谱过滤。以木槿花提取物为原料合成生物滤池。木槿是一种常见的植物,几乎在非洲所有地区都能找到。结果表明,该生物滤池的相对效率为94%。这使得该产品成为非洲和其他热带地区采用的一种新颖的产品,以延长太阳能光伏电池板的寿命和性能。
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引用次数: 1
A novel algorithm for estimation of Twitter users location using public available information 一种利用公共可用信息估计推特用户位置的新算法
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-012
Yasser Almadany, K. M. Saffer, Ahmed K. Jameil, Saad Albawi
Abstract Social media networks are an attractive and hot research area in the big data community because of their numerous active users. One of the most widely studied topics in social networks is the prediction from the public available data. Recently, researchers have successfully predicted many statistical and human properties from social media networks using different machine learning algorithms. In this paper, a new efficient and accurate algorithm is proposed to predict the country location of a Twitter user using his or her public information only. The proposed algorithm employs the public information of the Twitter user and that of his or her followers and friends to predict his or her location without using GPS data. A convenient data set of Twitter users is gathered and used to test our proposed algorithm using KNIME software. The proposed algorithm is compared with other state-of-the-art algorithms, and results showed that our proposed algorithm significantly outperforms other location detection algorithms by using Twitter users from different countries.
摘要社交媒体网络由于拥有众多活跃用户,是大数据社区中一个有吸引力和热门的研究领域。社交网络中研究最广泛的话题之一是来自公共可用数据的预测。最近,研究人员使用不同的机器学习算法成功地预测了社交媒体网络中的许多统计和人类特性。本文提出了一种新的高效、准确的算法,仅使用推特用户的公共信息来预测其国家位置。所提出的算法利用推特用户及其追随者和朋友的公共信息来预测他或她的位置,而不使用GPS数据。收集了一组方便的Twitter用户数据,并使用KNIME软件测试我们提出的算法。将所提出的算法与其他最先进的算法进行了比较,结果表明,通过使用来自不同国家的推特用户,我们提出的算法显著优于其他位置检测算法。
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引用次数: 1
A novel approach to label road defects in video data: semi-automated video analysis 一种在视频数据中标记道路缺陷的新方法:半自动视频分析
IF 1.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2020-01-01 DOI: 10.21307/ijssis-2020-007
Jakob Thumm, J. Masino, Martin Knoche, F. Gauterin, M. Reischl
Abstract Road defects like potholes have a major impact on road safety and comfort. Detecting these defects manually is a highly time consuming and expensive task. Previous approaches to detect road events automatically using acceleration sensors and gyro meters showed good results. However, these results could be significantly improved with additional usage of image analysis. A large, labeled image data set is required for training and validation. This paper presents a method to automate parts of the labeling task. The method is based on a simple two step approach: at first, an unsupervised algorithm detects possible events based on the acceleration data and filters those video sequences with defects. Second, a human operator decides based on the short video sequences if the event was due to an existing road defect and labels the corresponding area in an image.
坑洞等道路缺陷严重影响道路的安全性和舒适性。手动检测这些缺陷是一项非常耗时和昂贵的任务。以前使用加速度传感器和陀螺仪自动检测道路事件的方法取得了良好的效果。然而,这些结果可以显著改善额外使用图像分析。训练和验证需要一个大的、标记的图像数据集。本文提出了一种自动化部分标注任务的方法。该方法基于一个简单的两步方法:首先,一种无监督算法根据加速度数据检测可能的事件,并过滤那些有缺陷的视频序列。其次,操作员根据短视频序列判断事件是否由现有的道路缺陷引起,并在图像中标记相应的区域。
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引用次数: 1
期刊
International Journal on Smart Sensing and Intelligent Systems
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