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2017 Intl Conf on Advanced Control Circuits Systems (ACCS) Systems & 2017 Intl Conf on New Paradigms in Electronics & Information Technology (PEIT)最新文献

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Performance assessment of straight and L-shaped probe fed U-slotted patch antenna arrays for SAR applications 用于SAR应用的直型和l型探针馈电u型槽贴片天线阵列的性能评估
M. A. El-Hassan, K. Hussein, A. E. Farahat, K. Awadalla
In this paper the design of shaped beam antenna array for synthetic aperture array applications is presented. The proposed element for such array is an L-probe-fed U-slotted microstrip antenna. This antenna is characterized by a wideband suitable for the SAR imaging systems. The antenna element is analyzed atfirst to find out its characteristics. It has been proved that the proposed element has a bandwidth of 43% in the C-band. The mutual coupling is investigated for two adjacent elements of this type when arranged in the E-plane and again in the H-plane. It has been proved that the coupling in both arrangements is low enough to cause any significant effect on arrays arranged in the E or the H-planes. 20 elements of this antenna are arranged in the E-plane and the excitation of the elements is optimized to produce different desired beam-forms while the separation between the elements is fixed. Multiple patterns including a flat-topped beam (fan-shaped), a cosecant-squared pattern and Isoflux beam pattern have been designed and optimized using particle swarm algorithm. It turned out that this method has produced arrays with radiation patterns quite close to the desired ones and with sufficiently low side lobe levels.
本文介绍了用于合成孔径阵列的异形波束天线阵列的设计。该阵列所提出的元件是l探针馈电u槽微带天线。该天线具有适用于SAR成像系统的宽带特性。首先对天线单元进行分析,找出其特性。实验证明,该元件在c波段的带宽为43%。研究了两个相邻单元在e平面和h平面布置时的相互耦合。已经证明,这两种布置的耦合足够低,对布置在E面或h面的阵列产生任何显著影响。该天线的20个单元布置在e平面上,优化了单元的激励以产生不同的期望波束形式,而单元之间的间隔是固定的。利用粒子群算法设计并优化了平顶束(扇形)、余割平方束和等通量束等多种模式。结果表明,这种方法产生的阵列的辐射方向图与期望的非常接近,并且具有足够低的旁瓣电平。
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引用次数: 0
Addressing student misinterpretations of story problems in MAST 解决学生对MAST中故事问题的误解
Nabila A. Khodeir, N. Wanas, H. Elazhary, Nadia Hegazy
Story problems are of ultimate importance of mathematics. This stems from the fact that they help improve various students' skills including reading the story problem, extracting the embedded mathematical information and the unknown quantity to compute, and applying the correct mathematical operators to solve the problem. Unfortunately, this type of problems may suffer from misinterpretation errors and errors due to overlooking some embedded information regardless of the proficiency of the students in mathematics. This paper introduces the Math Story Problem Tutor (MAST), a Web-based intelligent tutoring system of probability story problems. The focus of this paper is to explain how MAST deals with those problems using the Question Generation Module (QGM) and the Cognitive Module (CM). The QGM is able to generate story problems based on Natural Language Generation (NLG) techniques. This results in known semantic descriptions and linguistic structures of each story problem part. The CM, on the other hand generates the correct answer through interpreting the story problem parts and converting them into a corresponding mathematical model. This helps MAST in tracing the student answer and addressing any misinterpretations or overlooked information using different types of feedback. A satisfaction questionnaire has shown extreme satisfaction of the students and teachers with the capabilities of MAST.
故事问题是数学中最重要的问题。这是因为它们有助于提高学生的各种技能,包括阅读故事问题,提取嵌入的数学信息和未知量进行计算,以及应用正确的数学运算符来解决问题。不幸的是,不管学生的数学水平如何,这类问题可能会因为忽略了一些嵌入的信息而出现误解错误和错误。本文介绍了基于网络的概率故事问题智能辅导系统——数学故事问题辅导系统(MAST)。本文的重点是解释MAST如何使用问题生成模块(QGM)和认知模块(CM)来处理这些问题。QGM能够基于自然语言生成(NLG)技术生成故事问题。这就得到了每个故事问题部分的已知语义描述和语言结构。另一方面,CM通过解释故事问题部分并将其转换为相应的数学模型来生成正确的答案。这有助于MAST追踪学生的答案,并使用不同类型的反馈来解决任何误解或忽略的信息。满意度问卷调查显示,学生和教师对MAST的能力非常满意。
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引用次数: 3
Broadband high gain antenna using simplified MTLs for wireless and radar applications 宽带高增益天线使用简化的mtl无线和雷达应用
M. Hindy, R. M. El-sagheer, M. Yasseen
This paper presents simulation and design of Broadband high gain antenna using simplified Metamaterial Transmission Lines (MTLs) wireless and radar applications. Both Gain and radiation efficiency are investigated taking into account the compact size of antenna. Different three-sized SMTL unit cells of different resonant frequencies are merged. The composed structure yields broadband antenna, with high gain and small size. CST microwave studio program used to modeling and simulating the presented antenna, and the simulated results showed the broadband and high gain properties of this antenna.
本文介绍了基于简化的超材料传输线(MTLs)无线和雷达应用的宽带高增益天线的仿真与设计。考虑到天线的紧凑尺寸,对增益和辐射效率进行了研究。合并了不同谐振频率的不同三尺寸SMTL单元胞。该复合结构产生了高增益、小体积的宽带天线。利用CST微波工作室程序对该天线进行建模和仿真,仿真结果表明该天线具有宽带和高增益的特性。
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引用次数: 0
High-precision speed control of four-phase switched reluctance motor fed from asymmetric power converter 非对称功率变换器供电的四相开关磁阻电机的高精度速度控制
Ghada A. Abdel Aziz, M. Amin
Switched reluctance motors (SRMs) are used in the industry due to their simple motor design construction, the susceptibility of running at wide speed range, high torque to inertia ratio, low cost, and high reliability. In this paper, the SRM drive system is fed from asymmetric four-phase power converter (APC) using soft switching technique. This paper presents a proposed precise speed controller (PSC) for a four-phase 75 KW 8/6 SRM. The performance of the PSC is evaluated and compared with PI and fuzzy logic (FLC) speed controllers. This comparison is based on the values of the rise time, settling time, overshoot, undershoot, speed error in the steady state, and torque ripples percentage of the three speed controllers. The robustness of the proposed PSC is validated in such cases e.g. mechanical parameter disparities, and external load disturbances. The four-phase SRM responses of motor speed versus speed command, speed error, four-phase currents, SRM reference current, and electromagnetic torque are investigated using MATLAB/SIMULINK.
开关磁阻电机(srm)由于其简单的电机设计结构,在宽速度范围内运行的敏感性,高转矩惯量比,低成本和高可靠性而在工业中得到应用。本文采用软开关技术将非对称四相功率变换器(APC)作为SRM驱动系统的馈源。本文提出了一种用于四相75kw 8/6 SRM的精确速度控制器(PSC)。对PSC的性能进行了评价,并与PI和模糊逻辑(FLC)速度控制器进行了比较。这种比较是基于三个速度控制器的上升时间、稳定时间、超调、欠调、稳态速度误差和转矩波动百分比的值。所提出的PSC的鲁棒性在诸如机械参数差异和外部负载干扰等情况下得到了验证。利用MATLAB/SIMULINK研究了电机转速与转速指令、转速误差、四相电流、SRM参考电流和电磁转矩的四相SRM响应。
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引用次数: 6
Net-zero-energy automated bio-diesel production unit 净零能耗自动化生物柴油生产装置
Waseem W. Saad, A. Hebala, H. Ashour
In this paper, the design and implementation of biodiesel process production unit controlled by a Programmable Logic Controller (PLC) and powered by photovoltaic (PV) is introduced. The main idea here is based on getting the biodiesel as a chemical reaction process of transestrefication offatty oils from wasted used cooking oil. This process requires continuous measurement from different sensors and take long hours to be finished. Hence, implementing a well-designed automated system is essential, while the need for operator supervision is greatly minimized, which in turn permits the labor cost to be reduced and optimizing the repeatability and efficiency of the whole process. The proposed unit utilizes an HMI with different SCADA facilities; hence, the operator can readily and efficiently take real time action on the flow of the process. The required electrical energy of the unit has been designed to be supplied through PV panels, which permits the production of the bio-diesel without the need for any other power source. The overall unit has been tested and found to be very reliable with significant energy efficient operation.
介绍了一种由可编程控制器(PLC)控制、光伏发电的生物柴油工艺生产装置的设计与实现。本文的主要思想是将废弃食用油中的脂肪油转化为生物柴油,通过化学反应得到生物柴油。这一过程需要不同传感器的连续测量,需要很长时间才能完成。因此,实施一个设计良好的自动化系统是必不可少的,同时大大减少了对操作员监督的需要,从而降低了人工成本,并优化了整个过程的可重复性和效率。拟议的装置使用具有不同SCADA设施的HMI;因此,操作员可以随时有效地对工艺流程采取实时行动。该装置所需的电能被设计为通过光伏电池板提供,这使得生物柴油的生产不需要任何其他电源。整个装置已经过测试,发现非常可靠,具有显著的节能运行。
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引用次数: 0
A simplified approach for error rate analysis in realistic free space optical fading channels 现实自由空间衰落信道误码率分析的一种简化方法
Mohamed Shehata, H. Mostafa
Free space optical (FSO) communication systems offer numerous advantages, such as their flexibility in redeployment and high data rates, as compared to optical fiber-based communications. However, these systems are susceptible to a wide range of fading phenomena due to the extremely random fluctuations in the atmospheric conditions. In this letter, a simple semi-deterministic approach is proposed to calculate the average bit error probability (ABEP) performance of FSO systems operating in arbitrary fading conditions, considering the intensity modulation — direct detection (IM/DD) on-off keying (OOK) modulation scheme.
与基于光纤的通信相比,自由空间光(FSO)通信系统具有许多优点,例如可灵活地重新部署和高数据速率。然而,由于大气条件的极端随机波动,这些系统容易受到大范围的衰落现象的影响。本文提出了一种简单的半确定性方法来计算在任意衰落条件下运行的FSO系统的平均误码率(ABEP)性能,考虑了强度调制-直接检测(IM/DD)开关键控(OOK)调制方案。
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引用次数: 0
Automated essay scoring linguistic feature: Comparative study 自动作文评分语言特征:比较研究
S. M. Eid, N. Wanas
Automated Essay Scoring (AES) is the solution to a tedious and time consuming activity of manually scoring students' essays. AES is usually treated as a supervised machine learning problem where feature extraction plays an important role. In an attempt to investigate the importance of lexical features in AES systems, a new extended feature set is developed by combining popularly known features. The combinedfeature set contains 22 features that captures five different aspects of writing qualities. The importance of each feature in the combined feature set is tested by eliminating each feature separately. It was found that using the number of nouns in the essay slightly degrades the AES system performance. The significance of the combined feature set is compared against three state-of-the-art AES commercial systems and its performance was found comparable.
自动作文评分(AES)是一个繁琐和耗时的手动评分学生的文章活动的解决方案。AES通常被视为一个有监督的机器学习问题,其中特征提取起着重要作用。为了研究词法特征在AES系统中的重要性,我们将一些众所周知的特征组合在一起,开发了一个新的扩展特征集。组合特性集包含22个特性,捕获了写作质量的五个不同方面。通过单独消去特征来测试组合特征集中每个特征的重要性。研究发现,在文章中使用名词的数量会略微降低AES系统的性能。将组合特征集的重要性与三个最先进的AES商业系统进行比较,发现其性能具有可比性。
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引用次数: 5
Industrial application of fault detection and fault isolation using artificial neural networks 工业上应用人工神经网络进行故障检测和故障隔离
Youssef A. Ghobashy, M. A. Geliel, M. E. Sengaby
In industrial processes, all available resources, are selected to improve the process performance. However, in critical processes, any kind of faults may lead to serious consequences. One of the main techniques to enhance process reliability is to early detect and isolate faults. Artificial Neural Networks (ANN) technique is a good tool to detect and isolate several types of faults in industrial systems. Fault detection and isolation based on ANN is proposed in this paper. This technique is implemented and tested on Three-Tank system as a bench mark. Moreover different fault scenarios are tested.
在工业过程中,选择所有可用的资源来改进过程性能。但在关键过程中,任何一种故障都可能导致严重的后果。早期发现和隔离故障是提高过程可靠性的主要技术之一。人工神经网络(ANN)技术是检测和隔离工业系统中多种类型故障的良好工具。提出了一种基于人工神经网络的故障检测与隔离方法。以三缸系统为基准,对该技术进行了实现和测试。并对不同的故障场景进行了测试。
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引用次数: 0
Deep generative image model using a hybrid system of generative adversarial nets (GANs) 基于生成对抗网络(gan)混合系统的深度生成图像模型
Ahmed M. Yousef, Yasser M. K. Omar, E. Fakharany
Synthesizing realistic images has been a challenge in machine learning, due to images being complex and high dimensional, thus making them hard to model well. Building on the recent progress made in both, generative multi adversarial nets (GMAN) and conditional generative adversarial nets (CGAN), this research aims at introducing a new method to improve image synthesis in generative adversarial networks (GAN). The research benefits from combining the best of both techniques to build a model (Hybrid-GAN) that produces higher images quality, which is hardly distinguished from real images. Furthermore, this model significantly enhances log-likelihood of test data under the conditional distributions. To validate the results, we have conducted a detailed comparison between images generated by our new model, Hybrid-GAN and those images produced by standard GANs. We execute the new model using MNIST dataset and demonstrated the results obtained from the generating task.
由于图像复杂且高维,因此很难很好地建模,因此合成逼真图像一直是机器学习中的一个挑战。基于生成式多对抗网络(GMAN)和条件生成式对抗网络(CGAN)的最新进展,本研究旨在引入一种新的方法来改进生成式对抗网络(GAN)中的图像合成。该研究得益于将两种技术的优点结合在一起,建立了一个模型(Hybrid-GAN),该模型产生的图像质量更高,与真实图像几乎没有区别。此外,该模型显著提高了条件分布下测试数据的对数似然性。为了验证结果,我们对新模型Hybrid-GAN生成的图像与标准gan生成的图像进行了详细的比较。我们使用MNIST数据集执行新模型,并演示了从生成任务获得的结果。
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引用次数: 1
Malicious VBScript detection algorithm based on data-mining techniques 基于数据挖掘技术的恶意VBScript检测算法
Doaa Wael, Ahmed F. Shosha, Samir G. Sayed
Malware attacks are amongst the most common security threats. Not only malware incidents are rapidly increasing, but also the attack methodologies are getting more complicated. Moreover malware writers expand in using different platforms and languages. This raises the need for new detection methods which support more reliable, low resource consuming and fast solutions. In this paper, a new algorithm has been proposed based on machine learning techniques and static analysis features to detect malicious scripts specifically for VBScript files. Experimental results show that the proposed algorithm can achieve 97% detection ratio.
恶意软件攻击是最常见的安全威胁之一。不仅恶意软件事件在迅速增加,而且攻击方法也越来越复杂。此外,恶意软件编写者使用不同的平台和语言。这就需要新的检测方法来支持更可靠、低资源消耗和快速的解决方案。本文提出了一种基于机器学习技术和静态分析特性的检测VBScript文件恶意脚本的新算法。实验结果表明,该算法可以达到97%的检测率。
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引用次数: 6
期刊
2017 Intl Conf on Advanced Control Circuits Systems (ACCS) Systems & 2017 Intl Conf on New Paradigms in Electronics & Information Technology (PEIT)
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