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2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT)最新文献

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A Novel 36-Pulse Star Rectifier with Passive Injection Circuits at DC Link 一种新型直流链路无源注入36脉冲星形整流器
Md. Abdul Malek, Md. Abu Bakar Siddik, Md. Shoaib Akther
This paper presents a new 36-pulse star connected rectifier. It takes intimate sinusoidal currents from utility with the elimination of lower than 35th order harmonics. The proposed rectifier consists of a parallel four-star 12-pulse diode rectifier and two passive injection circuits at DC links. This passive injection circuit can triple the number of pulses of 12-pulse star rectifier system. The primary side of specially tapped interphase transformer (STIT) with two diodes constitutes the first injection circuit while the secondary winding of the STIT with a single phase full-wave rectifier (SPFR) constitutes the second passive injection circuit. This rectifier is compatible for large current rating application such as electroplating, plasma torches, dc arc furnaces etc. The simplicity of the proposed rectifier scheme makes it more economical compared to other existing designs of same performance. The proposed rectifier is examined and simulated in MATLAB environment. The simulation result confirms the requirement of IEEE-519 standards.
本文介绍了一种新型36脉冲星形连接整流器。它在消除了低于35次谐波的情况下,从公用事业中获得了亲密的正弦电流。所提出的整流器由并联四星12脉冲二极管整流器和直流链路上的两个无源注入电路组成。该无源注入电路可使12脉冲星型整流系统的脉冲数增加三倍。带有两个二极管的特殊抽头间相变压器(STIT)的一次侧构成第一注入电路,带有单相全波整流器(SPFR)的STIT的二次绕组构成第二无源注入电路。该整流器适用于大电流应用,如电镀、等离子炬、直流电弧炉等。所提出的整流器方案的简单性使其与现有的相同性能的设计相比更加经济。在MATLAB环境下对所设计的整流器进行了测试和仿真。仿真结果证实了IEEE-519标准的要求。
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引用次数: 5
Numerical Assessment of the Backward Facing Step for NACA 0015 Airfoil using Computational Fluid Dynamics NACA 0015翼型后面向阶跃的计算流体动力学数值评估
Asif Kabir, Md. Saadbin Chowdhury, Md Jahirul Islam, Mehran Islam
The objective of this work was to investigate the lift and drag characteristics of a NACA 0015 airfoil with a backward facing step. For a free stream velocity of 30m/s, the point of separation was determined via CFD analysis for an increasing angle of attack. A backward facing step was then introduced just prior to the point of separation which extended till the trailing edge. Computational studies were conducted with the goal of enhancing the aerodynamic performance of the airfoil by inserting several backward facing steps of gradually increasing depth. The CFD analysis was conducted for 30 m/s wind speed, with steps placed just prior to the point of separation for 18° angle of attack. The results produced show that as much as a 26% reduction in drag is possible by introducing the step. But at the same time, about 12% reduction in the lift was also observed. A wind tunnel test on a NACA 0015 was also conducted to verify the results from CFD analysis. Predominantly the goal of this thesis was to numerically determine whether or not the aerodynamic performance of an airfoil can be enhanced by introducing a backward facing step on the upper surface of the airfoil.
这项工作的目的是调查一个NACA 0015翼型的升力和阻力特性与向后面对的步骤。当自由流速度为30m/s时,通过CFD分析确定了迎角增大时的分离点。一个向后面对的步骤,然后引入刚刚之前的分离点,延伸到后缘。为了提高翼型的气动性能,进行了计算研究,目的是通过插入几个逐渐增加深度的向后台阶来提高翼型的气动性能。CFD分析是在风速为30 m/s的情况下进行的,在18°迎角的分离点之前放置了步骤。结果表明,通过引入阶跃,可以减少多达26%的阻力。但与此同时,也观察到升力降低了约12%。在NACA 0015上进行了风洞试验,以验证CFD分析的结果。本论文的主要目标是在数值上确定翼型的气动性能是否可以通过在翼型的上表面引入一个向后的台阶来增强。
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引用次数: 3
Experimental Results of a locally developed BLDC Motor Controller for electric tricycle 国产电动三轮车无刷直流电机控制器的实验结果
Md. Fahim Bhuiyan, N. Sakib, Mohammad Rejwan Uddin, K. M. Salim
The rapid growing battery-powered and plug-in hybrid electric vehicles will have a significant impact on power networks due to their zero carbon emission and mass deployment. DC motors, AC induction motors, and Brushless Direct Current (BLDC) motors are used worldwide in electric vehicles for years. Among them, BLDC motors are one of the electrical drives that are continually gaining popularity in motion control applications due to their high efficiency, good dynamic response and low maintenance. Unlike DC motors and Induction motors, BLDC motors need a controller as the motors run in 3 phase but take DC input. The controller converts DC power to 3 phase AC power suitable for the motor. This paper describes the design and development of a BLDC motor controller and its performance comparison with the existing BLDC motor controller imported from abroad. The controller circuit is simulated in Proteus software and the PCB is designed in ARES.
快速增长的电池驱动和插电式混合动力汽车由于其零碳排放和大规模部署,将对电网产生重大影响。直流电机、交流感应电机和无刷直流(BLDC)电机多年来在全球范围内用于电动汽车。其中,无刷直流电机因其效率高、动态响应好、维护成本低等优点,在运动控制应用中不断得到普及。与直流电机和感应电机不同,无刷直流电机需要一个控制器,因为电机在三相运行,但采用直流输入。控制器将直流电源转换为适合电机的三相交流电源。本文介绍了一种无刷直流电动机控制器的设计与开发,并与国外现有无刷直流电动机控制器进行了性能比较。在Proteus软件中对控制器电路进行了仿真,并在ARES中设计了PCB。
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引用次数: 8
Wireless Home Automation System Using IoT and PaaS 使用物联网和PaaS的无线家庭自动化系统
A. M. Nitu, Md. Jahid Hasan, Md. Shahin Alom
Home automation based on Internet of Things (IoT) is getting huge attention of mass people in recent years. Smart home eases and secures the management of the home appliances. This paper presents a low cost and reliable smart home system that assists the users to manage home appliances without the need of their physical presence. The proposed system includes smart door lock system using Radio Frequency Identification (RFID) card and password. It can store and display information of temperature & humidity of a home, and notifies the users of switching on/off time of light, fan and other home appliances using embedded micro-web server and an IoT platform. The user can also control the light intensity and fan speed based on LDR and temperature sensor values respectively. The system includes gas leakage & fire alarm. It has leakage gas removing & fire extinguishing facility and SMS notification system using IoT platform. The system uses real IP and RESTful API for controlling, monitoring and accessing the home appliances remotely from anywhere in the world using Android based smartphone app or web app. This system is user friendly and energy efficient.
近年来,基于物联网(IoT)的家庭自动化受到了人们的广泛关注。智能家居为家电的管理提供了便利和保障。本文提出了一种低成本、可靠的智能家居系统,帮助用户在不需要实体存在的情况下管理家电。该系统包括使用射频识别卡和密码的智能门锁系统。它可以存储和显示家庭的温度和湿度信息,并通过嵌入式微web服务器和物联网平台通知用户灯、风扇等家电的开关时间。用户还可以根据LDR和温度传感器值分别控制光照强度和风扇转速。该系统包括燃气泄漏和火灾报警。设有泄漏气体清除灭火设施和物联网平台短信通知系统。该系统使用真实IP和RESTful API,使用基于Android的智能手机应用程序或web应用程序,从世界任何地方远程控制,监控和访问家用电器。该系统用户友好且节能。
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引用次数: 4
Design of CMOS On-Chip Millimeter-Wave Transformer Coupled Balun and Power Divider-Combiner with Optimal Amplitude and Phase Imbalance 最优幅相不平衡的CMOS片上毫米波变压器耦合Balun和功率分频合成器的设计
M. S. Hossain, M. Fujishima, T. Yoshida, S. Amakawa, M. Rashid
Millimeter-wave passive elements are one of the vital part to distribute power through integrated circuitry. And transformer coupled passive devices are used not only for signal transmitting but also making chip area smaller. A transformer coupled planar and stacked type both could be used for balun and power divider-combiner design. This type of balun provide small amplitude imbalance ~2dB and 180° phase imbalance between 57-120 GHz bandwidth (BW) and successively shrinking the layout area of 0.0061mm2. On the other hand, transformer coupled two way power divider-combiner (PD-C) occupies 0.0088 mm2 (7.5 Times Smaller than Wilkinson PD-C) with amplitude variation ~1.87dB and phase angle variation 3° with larger BW (50-120 GHz). Again four way PD-C occupies 0.0122mm2 (5 Times Smaller than Wilkinson PD-C) having amplitude variation ~2dB and phase angle variation 2.8° with a larger BW 50-120 GHz. Proposed stacked small transformers with a center trapped baluns and power divider-combiner have been implied on two millimetre-wave amplifiers on 55nm DDC CMOS.
毫米波无源元件是集成电路中分配功率的重要部件之一。采用变压器耦合无源器件不仅可以有效地传输信号,而且可以减小芯片面积。平面和堆叠型变压器均可用于平衡器和功率分配器的设计。该平衡器在57 ~ 120 GHz带宽(BW)范围内提供2dB的小幅度不平衡和180°相位不平衡,并依次缩小0.0061mm2的布局面积。另一方面,变压器耦合的双向功率分配器(PD-C)占地0.0088 mm2(比Wilkinson PD-C小7.5倍),幅值变化约1.87dB,相角变化3°,BW较大(50-120 GHz)。四路PD-C占用0.0122mm2(比Wilkinson PD-C小5倍),振幅变化约2dB,相位角变化2.8°,BW更大50-120 GHz。在55nm DDC CMOS的两个毫米波放大器上,提出了一种具有中心捕获平衡器和功率分频合成器的堆叠式小型变压器。
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引用次数: 1
A Novel Approach to detect the Compound Level of Fertilizer and Pesticide in the Soil 一种检测土壤中肥料和农药复合水平的新方法
Abu Shufian, Riadul Islam, Md. Mominur Rahman
Fertilizers (Triple superphosphate) and pesticide (fungicide and insecticide) are one of the major products used to increase the productivity of crops. As time passes the amount of pesticide in crops is not maintained fixed. Pesticide does react with water and the level of pesticide decreases day by day. Hence, it is important to know the present level of pesticide in soil and crops. TSP and pesticide (fungicide and insecticide) are used in this project as a sample of fertilizer and pesticide, cause of its high demand in Bangladesh. To detect the amount of TSP and pesticide in the oil sample, the conductivity property of TSP and pesticide (fungicide and insecticide) are used. Three separate solutions of TSP and pesticide (fungicide and insecticide) is made with water then AC source is applied to the solution instead of DC to avoid electrolysis of the given solution. Through the op-amp and two comparators, the final result is accomplished. Those two comparators, comparator 1 and comparator 2 were used to find the presence of 30%, 50%,70% TSP and Pesticide respectively. As result suggest, the resistance of the solution decreases with the incremental frequency. The compatible frequency for AC source is selected as 40 KHz. The reference voltage of comparator 1 is 1.4v and comparator 2 is 5v.
化肥(三联过磷酸钙)和农药(杀菌剂和杀虫剂)是用来提高作物生产力的主要产品之一。随着时间的推移,作物中农药的用量不会保持不变。农药确实会与水发生反应,农药的含量也在一天天下降。因此,了解土壤和作物中目前的农药含量是很重要的。本项目使用TSP和农药(杀菌剂和杀虫剂)作为肥料和农药的样本,因为其在孟加拉国需求量很大。利用TSP和农药(杀菌剂和杀虫剂)的电导率特性来检测油样中TSP和农药的含量。将三种TSP和杀虫剂(杀菌剂和杀虫剂)分别用水制成溶液,然后将交流电源而不是直流电源应用于溶液,以避免给定溶液的电解。通过运算放大器和两个比较器,完成了最终的结果。使用比较器1和比较器2分别检测30%、50%、70%的TSP和农药的存在。结果表明,溶液的电阻随频率的增加而减小。交流源兼容频率选择为40khz。比较器1参考电压为1.4v,比较器2参考电压为5v。
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引用次数: 3
Modeling and Performance Analysis of an Γ-Model Based DFIG Wind Turbine with Duel Crowbar Protection 基于Γ-Model双撬棍保护的DFIG风力机建模与性能分析
M. A. Shawon, S. M. Imrat Rahman, N. Hossain
This paper presents a detailed mathematical model of a doubly fed induction generator (DFIG) based wind turbine system. The controllers associated with this DFIG model are also derived in synchronously rotating reference frame considering Γ-Model of induction generator. A PSCAD/EMTDC simulation model has been implemented based on the proposed DFIG model. The effectiveness of this model is further verified through different case studies where the dynamic response of the implemented PSCAD model is compared with the theoretical model response. The simulation results show satisfactory performance of the proposed model and can be used for evaluation of transient stability of DFIG wind turbine system.
本文建立了双馈感应发电机风力发电系统的详细数学模型。在考虑感应发电机Γ-Model的同步旋转参照系下,推导了与该DFIG模型相关的控制器。基于所提出的DFIG模型,实现了PSCAD/EMTDC仿真模型。通过不同的案例研究,将实现的PSCAD模型的动态响应与理论模型响应进行比较,进一步验证了该模型的有效性。仿真结果表明,该模型具有较好的性能,可用于DFIG风力发电机组系统暂态稳定性的评估。
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引用次数: 0
An IoT based mHealth Platform for Chronic Kidney Disease Patients 基于物联网的慢性肾病患者移动健康平台
Alaa Noor, Anonnya Banerjee, Mayeesha Fairooz Ahmad, Mohammed Nazim uddin
Medicinal care signifies as a standout amongst the most striking application ranges for the IoT. Hospitals utilize new advances and IoT to screen the situation of patient's therapeutic conditions and other related data. There are vast IoT applications that are being readily used in the medical care nowadays from. It can possibly keep patients safe and sound, as well as it will enhance how doctors provide care. Thermometers, electrocardiograms, ultrasounds, glucose monitors, and more are altogether beginning to end up associated and giving patients a chance to track their wellbeing. This is significant for those circumstances that require line up meetings with specialists. In this study, we presented a preliminary healthcare system for the treatment of Chronic Kidney Disease (CKD) or Chronic Renal Disease patients with the concept of IoT, which includes patient log, the nutrition of the food basically focusing on the level of salt intake, monitoring the sleep pattern, activity level, water intake and so on in order to provide with required improvements needed for the betterment of their health condition. In addition, the data and information obtained from the patient log and from their activities will stored in cloud for future purposes and simultaneously it can be accessed directly by the caregivers for monitoring of a patient’s health condition.
医疗保健是物联网最引人注目的应用领域之一。医院利用新技术和物联网来筛选患者的治疗状况和其他相关数据。现在有大量的物联网应用程序在医疗保健中很容易使用。它可能会保证病人的安全和健康,也会提高医生提供护理的能力。体温计、心电图、超声波、血糖监测仪等等都开始相互关联,让患者有机会追踪自己的健康状况。这对于那些需要与专家进行排队会议的情况非常重要。在这项研究中,我们提出了一个初步的医疗保健系统,用于治疗慢性肾脏疾病(CKD)或慢性肾脏疾病患者的物联网概念,包括患者日志,食物的营养,主要关注盐的摄入量,监测睡眠模式,活动水平,水的摄入量等,以提供所需的改进,以改善他们的健康状况。此外,从患者日志及其活动中获得的数据和信息将存储在云中以供将来使用,同时护理人员可以直接访问这些数据和信息,以监测患者的健康状况。
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引用次数: 5
Face Recognition System Based on Raspberry Pi Platform 基于树莓派平台的人脸识别系统
Nafis Mustakim, Noushad Hossain, Mohammad Mustafizur Rahman, Nadimul Islam, Zayed Hossain Sayem, Md. Asaduz Zaman Mamun
Human face recognition plays an important role in video surveillance, human-computer interface, personalizing different applications. In this paper, we present an approach to detect and identify a human face from the real-time video that tracks a face and compares it with stored data of known individuals. Our approach recognizes an individual within a fraction of a second which completely ignores any background effect. It also shows additional information about that individual. Besides, this method also works on different lighting conditions which make it suitable to execute its purpose in a wide variety of environment without encountering any significant error. We have implemented our work using a Raspberry Pi. And this approach utilizes the benefits offered by different python libraries like OpenCV and numPy. SQLite database management system is used as the backbone of its memory. Through its faster and authentic performance, this system is worthy enough to be integrated with any applications to boost up automation and user-friendliness.
人脸识别在视频监控、人机界面、个性化等不同应用中发挥着重要作用。在本文中,我们提出了一种从实时视频中检测和识别人脸的方法,该方法可以跟踪人脸并将其与已知个体的存储数据进行比较。我们的方法可以在几分之一秒内识别出一个人,完全忽略任何背景影响。它还显示了有关该个人的其他信息。此外,该方法也适用于不同的照明条件,使其适合在各种环境中执行其目的,而不会遇到任何重大误差。我们已经使用树莓派实现了我们的工作。这种方法利用了不同python库(如OpenCV和numPy)提供的优势。使用SQLite数据库作为其内存管理系统的骨干。通过其更快和真实的性能,该系统值得与任何应用程序集成,以提高自动化和用户友好性。
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引用次数: 13
Using Social Networks to Detect Malicious Bangla Text Content 使用社交网络检测恶意孟加拉文本内容
Tanvirul Islam, Subhenur Latif, N. Ahmed
Digital technology has accelerated social networking and brought revolutionary changes. Twitter Facebook and YouTube are the most familiar platforms for social communication, marketing and information distribution. Unhappily, these networks have been invaded by spammers who misuse these online social networking platforms with misinformation, fake news, rumors, malicious links, unsolicited messages, comments etc. Therefore, spam detection in social networks has become a novel framework for distribution of information, sentiments, and news. Our research expresses the experimental study on spam identification from text data. Extensive researches have been done on spam detection field from English texts or other languages. But detection of spam from malicious Bangla text content still needs a lot of attention. In this experimental research, we have used Multinomial Naïve Bayes (MNB) classifier, a supervised machine learning algorithm with feature extraction to detect spam from Bangla text at the sentence level. Our proposed system identifies spam based on the polarity of each sentence correlated with it. Finally, our experiment shows that the model has an accuracy of 82.44% in detecting spam Bangla text content.
数字技术加速了社交网络的发展,带来了革命性的变化。Twitter、Facebook和YouTube是人们最熟悉的社交交流、营销和信息分发平台。不幸的是,这些网络已经被垃圾邮件发送者入侵,他们滥用这些在线社交网络平台,散布错误信息、假新闻、谣言、恶意链接、未经请求的信息、评论等。因此,社交网络中的垃圾邮件检测已成为信息、情感和新闻分发的新框架。我们的研究表达了基于文本数据的垃圾邮件识别的实验研究。在英语文本和其他语言的垃圾邮件检测领域已经做了大量的研究。但是从恶意孟加拉文本内容中检测垃圾邮件仍然需要大量的关注。在本实验研究中,我们使用了Multinomial Naïve Bayes (MNB)分类器,这是一种带有特征提取的监督机器学习算法,用于在句子级别检测孟加拉语文本中的垃圾邮件。我们提出的系统根据与之相关的每个句子的极性来识别垃圾邮件。最后,我们的实验表明,该模型对垃圾孟加拉语文本内容的检测准确率为82.44%。
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引用次数: 17
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2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT)
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