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2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)最新文献

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Compact bandstop filter using defected ground structure (DGS) 基于缺陷接地结构(DGS)的紧凑型带阻滤波器
S. Rehman, A. Sheta, M. Alkanhal
This paper presents a new structure to implement compact bandstop filters by employing coupled DGS resonators etched in the ground plane. The proposed bandstop filter consists of symmetrical DGS resonators with a microstrip excitation to obtain a bandstop filter response. By adjusting space S between the two DGS coupled resonators, the bandwith of the bandstop filter can be easily controlled. A bandstop filter is designed, analyzed and implemented on FR4 dielectric substrate to operate at 2GHz. The measured results are in good agreement with simulations.
本文提出了一种新的结构,通过在地平面上蚀刻耦合DGS谐振器来实现紧凑型带阻滤波器。所提出的带阻滤波器由对称DGS谐振器和微带激励组成,以获得带阻滤波器响应。通过调节两个DGS耦合谐振器之间的空间S,可以很容易地控制带阻滤波器的带宽。设计、分析并实现了一种在FR4介质基板上工作于2GHz频率的带阻滤波器。实测结果与模拟结果吻合较好。
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引用次数: 38
Interconnect modeling with the existence of line inductance 存在线电感的互连建模
M. El-Moursy, H. Shawkey
Simple uniform reduced order model is used to model an RLC interconnect line. Waveform characterization is used to evaluate the accuracy of the adopted models. As compared to RC lines, less than five times the number of sections is sufficient to model RLC lines. Look-up tables are provided to simplify the process of choosing the best interconnect section model to characterize an RLC interconnect line. The tables are shown to be accurate for wide range of relative impedance of the driver, the line, and the load. The tables provide a simple and quick mean to characterize an RLC interconnect which is necessary for performance evaluation in digital circuits. The presented model reduces the simulation time while keeping the simulation accuracy. The simulation time can be reduced by up to 72% with less than 10% reduction in accuracy using the provided tables.
采用简单均匀降阶模型对RLC互连线进行建模。波形特性用于评估所采用模型的准确性。与RC线相比,不到五倍的截面数量就足以模拟RLC线。提供了查找表,以简化选择最佳互连截面模型来表征RLC互连线的过程。对于驱动器、线路和负载的相对阻抗的宽范围,表显示是准确的。这些表提供了一种简单快捷的方法来表征RLC互连,这是数字电路性能评估所必需的。该模型在保证仿真精度的同时减少了仿真时间。使用所提供的表,模拟时间最多可减少72%,精度降低不到10%。
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引用次数: 3
Mid-wave infrared characterization of an aircraft plume 飞机羽流的中波红外表征
S. Retief, P. Smit, Mm Dreyer
Development of the tracking algorithms used in an infrared seekerhead missile requires the infrared characteristics of the target against which the missile will be directed. Mid-wave infrared recordings of such a target were made at altitude during a flight test. The measurement setup for this test is described, as well as the additional recordings required during data reduction afterwards. An exposition of the general theoretical approach used for the data reduction of infrared image recordings of targets is given and the minimum data required is inferred. The data reduction is then applied to the plume of the target aircraft. The results of the plume data reduction, consisting of mid-wave infrared radiance profiles at different altitudes and the effect of altitude as well as aircraft aspect angle on plume intensity are then presented.
用于红外导引头导弹的跟踪算法的发展需要导弹所要瞄准的目标的红外特性。这种目标的中波红外记录是在飞行试验期间在高空进行的。描述了该测试的测量设置,以及随后在数据缩减过程中所需的额外记录。阐述了目标红外图像记录数据缩减的一般理论方法,并推导出所需的最小数据量。然后将数据缩减应用于目标飞机的羽流。然后给出了羽流数据缩减的结果,包括不同高度的中波红外辐射曲线,以及高度和飞机俯仰角对羽流强度的影响。
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引用次数: 7
Improvement of the performances MPPT system of wind generation 风力发电MPPT系统性能的改进
I. Hamzaoui, F. Bouchafaa, A. Hadjammar, A. Talha
The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated. There are two families from control structures, the strategy from maximizing the power with and without velocity control. The aim of this paper is to evaluate the performances of two types of MPPT controllers mentioned on an 7.5 kW test bench containing a DFIG and we interested to compare this two strategies from maximizing the power extracted for a wind generation system with a horizontal axis The corresponding simulation model are described in section III. The studied MPPT controllers are presented results are given, analyzed and discussed in part in part IV. Finally, In last part, extracts some conclusions on this paper.
用于发电的风力涡轮机应该能够产生最大的功率,充分利用风能。一个特定的已知术语:必须引入最大功率点跟踪(MPPT)以获得最大的能源效率。该命令的策略是通过控制电磁转矩来调整速度机制,以最大限度地产生电能。从控制结构来看,有两种策略,一种是有速度控制,另一种是没有速度控制。本文的目的是在包含DFIG的7.5 kW试验台上评估上述两种类型的MPPT控制器的性能,我们有兴趣比较这两种策略,以最大限度地提高风力发电系统的功率提取。相应的仿真模型将在第三节中描述。第四部分给出了所研究的MPPT控制器的结果,并对结果进行了分析和讨论。最后,在最后一部分中,总结了本文的一些结论。
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引用次数: 11
The design of experimental radar REX: Ultra high bandwidth receiver and exciter design 实验雷达REX的设计:超高带宽接收机和激振器的设计
L. Botha, C. Kitching, Ali Almsallam
Modern experimental radar systems that are used for advanced research into persistent surveillance and topics such as high range resolution need an ultra wide bandwidth of several hundred megahertz. There is furthermore a requirement for a high Spurious Free Dynamic Range (SFDR). This presents a unique challenge to the designer of the receiver- and exciter system. This paper presents the design challenges and one solution to these challenges.
用于持续监视和高距离分辨率等主题的高级研究的现代实验雷达系统需要几百兆赫的超宽带。此外,有一个高杂散自由动态范围(SFDR)的要求。这对接收机和励磁系统的设计者提出了独特的挑战。本文提出了设计挑战和解决这些挑战的一种方法。
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引用次数: 0
Long wavelength determination of a strained quantum well structure based on GaxIn1−x−yAsySb1−y /GaSb for gas detection 气体探测中基于GaxIn1−x−yAsySb1−y /GaSb的应变量子阱结构的长波测定
A. Aissat, S. Nacer, H. Aliane, J. Vilcot
In this paper we have studied strained structures wells based on GaInAsSb over GaSb substrate. The GaSb substrates allow the mesh accordability with the GaInAsSb solid solution in the range 1.7–3.5 μm. The conduction band and valence discontinuities are evaluated. A Basic source-detector direct transition has been demonstrated at 2–3 μ m. The III-V based GaSb components have many applications in optical fiber links, radar transmissions through atmospheric windows or air detection and spectroscopic analysis of the gases. From this structure it is possible to make semiconductor lasers operating continuously at room temperature, low non-cooled detectors.
本文研究了基于GaInAsSb在GaSb衬底上的应变结构井。GaSb衬底允许与GaInAsSb固溶体在1.7-3.5 μm范围内的网格一致性。评估了传导带和价的不连续。基于III-V的GaSb组件在光纤链路,通过大气窗口的雷达传输或空气探测和气体的光谱分析中有许多应用。从这种结构可以使半导体激光器在室温下连续工作,低非冷却探测器。
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引用次数: 2
Biasing effect on improvement of linearity and efficiency of RF linear power amplifier 偏置效应对提高射频线性功率放大器线性度和效率的影响
M. Tayel, Amir Al-Mslmany
Based on bipolar junction transistor (BJT) modeling the theoretical analysis of biasing effect on improvement of linearity and efficiency of RF linear power amplifier (LPA) are introduced, according to these analysis and by using matlab curve fitting toolbox an analytical model for improvement of linearity and efficiency of RF linear power amplifiers (PAs) is introduced. This model simplifies the traditionally complicated methods of analysis of RF PA. According to a change of the DC bias as a function of the AC input signal of RF linear PA the linearity and efficiency can be improved.
基于双极结晶体管(BJT)建模,对偏置对射频线性功率放大器(LPA)线性度和效率提高的影响进行了理论分析,并在此基础上,利用matlab曲线拟合工具箱建立了射频线性功率放大器(pa)线性度和效率提高的分析模型。该模型简化了传统复杂的射频波压分析方法。通过改变直流偏置随交流输入信号的变化,可以提高射频线性放大器的线性度和效率。
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引用次数: 1
Wireless Sensor Networks for smart grid applications 用于智能电网应用的无线传感器网络
M. Erol-Kantarci, H. Mouftah
Electrical power grid is among the critical infrastructures of a nation. In the past several years, the power grids have experienced several major failures which have caused large financial losses in various countries around the globe. In a close future, the imbalance between the growing demand and the diminishing fossil fuels, aging equipments, and lack of communications are anticipated to negatively impact the operation of the power grids. For this reason, governments and utilities have recently started working on renovating the power grid to meet the power quality and power availability demands of the 21st century. The opportunities that have become available with the advances in Information and Communications Technology (ICT) have paved the way to this modernization. The new grid empowered by ICT is called as the smart grid. The natural extension of the smart grid applications to the consumer premises can be through Wireless Sensor Networks (WSNs) which are able to provide pervasive communications and control capabilities at low cost. WSNs have broad range of applications in the smart grid. In this paper we discuss the application of the WSNs in the home energy management services. We evaluate the performance of WSNs in terms of delivery ratio, delay and Packet Delay Variance (PDV) for varying interarrival times and varying network sizes. We also provide numerical results on the reduced cost, load and carbon emissions by our home energy management application.
电网是一个国家的关键基础设施之一。在过去的几年里,电网经历了几次重大故障,给全球许多国家造成了巨大的经济损失。在不久的将来,日益增长的需求与日益减少的化石燃料之间的不平衡、设备老化以及通信不足预计将对电网的运行产生负面影响。出于这个原因,政府和公用事业公司最近开始着手改造电网,以满足21世纪的电力质量和电力供应需求。信息和通信技术(ICT)的进步所带来的机会为这种现代化铺平了道路。由信息通信技术支持的新电网被称为智能电网。智能电网应用的自然扩展到消费者场所可以通过无线传感器网络(wsn),它能够以低成本提供无处不在的通信和控制能力。无线传感器网络在智能电网中有着广泛的应用。本文讨论了无线传感器网络在家庭能源管理服务中的应用。在不同的到达间隔时间和不同的网络规模下,我们根据传输比、延迟和分组延迟方差(PDV)来评估WSNs的性能。我们还提供了通过我们的家庭能源管理应用程序降低成本,负荷和碳排放的数值结果。
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引用次数: 46
Signal stationarity testing and detecting of its abrupt change 信号平稳性测试及其突变检测
E. Akhouayri, E. Hassan, Ait Laasri, D. Agliz, A. Atmani
Automatic testing of stationarity and detecting of its abrupt change are of primary importance in numerous applications ranging from exploratory data analysis to diagnosis or surveillance. In which case, we are interested in points where the signal stationarity is violated. We consider the problem of how to detect these change-points, which we identify by finding sharp changes in the signal characteristics. Several different methods are considered. Here we suggest a method for detecting and picking these abrupt changes automatically. We divide a record into intervals of equal lengths and check the "local stationarity" between two consecutive intervals by using cross correlation. Because of its ability to accentuate abrupt changes in the signal frequency, it can be effectively employed to detect weak signals in a stationary noise background. In this paper we demonstrate the technique on the problem of detecting and picking P-arrival phase seismic. The intervals have approximately the same characteristics when these include only background noise. But, the similarity breaks abruptly when a seismic signal arrives. This break of similarity makes us possible to detect P-wave arrival. Because the method can detect changes both in frequency and amplitude we can use it on a basic problem in seismic data analysis, which is recognition of weak signals in the presence of ambient noise.
在从探索性数据分析到诊断或监测的许多应用中,平稳性的自动测试和检测其突变是至关重要的。在这种情况下,我们感兴趣的是信号平稳性被破坏的点。我们考虑如何检测这些变化点的问题,我们通过寻找信号特征的急剧变化来识别这些变化点。考虑了几种不同的方法。本文提出了一种自动检测和提取这些突变的方法。我们将记录划分为等长度的区间,并利用互相关检查两个连续区间之间的“局部平稳性”。由于它能够突出信号频率的突变,因此可以有效地用于检测平稳噪声背景下的微弱信号。本文介绍了p -到达相地震的探测与提取技术。当这些间隔只包含背景噪声时,它们具有大致相同的特性。但是,当地震信号到达时,这种相似性就突然中断了。这种相似性的打破使我们有可能探测到p波的到达。由于该方法可以同时检测频率和幅度的变化,因此可以将其用于地震数据分析中的一个基本问题,即在环境噪声存在下识别微弱信号。
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引用次数: 8
Bayesian decision-making for industrial production facilities and processing 工业生产设施与加工的贝叶斯决策
Noureddine Hassini, Saim Zouairi
Decision on a strategy for effective predictive Reliability, Availability, Maintainability and Safety (RAMS), by the application of Bayesian networks, while ensuring a better preserving of the operators and installation safety in its entirety. A Bayesian network is an acyclic directed graph where nodes represent discrete random variables value (True, False), and the links influences between the variables or conditional dependencies. Relations between variables are deterministic or probabilistic. In a context of risk management, the causal relationships between different events (cause-effect) that can save any installation dysfunction should be taken into account, integrating the conditional probabilities, based on the opinions of experts' field and on the data mining. Bayesian Networks have become a tool for uncertain reasoning, monitoring tasks such as diagnosis, prediction, and decision making. This makes Bayesian networks a subject of research of artificial intelligence. The processing of data through inference allows us to analyze up-and-down and enrich the basis of feedback through the acquisition of observations (evidence). In this study we present the contribution of Bayesian networks to production and processing of natural gas and an application example will be given for a component (boiler) of the liquefied natural gas complex GL4z industrial facility located in Arzew, western Algeria.
通过贝叶斯网络的应用,制定有效预测可靠性、可用性、可维护性和安全性(RAMS)的策略,同时确保更好地保护操作人员和设备的整体安全。贝叶斯网络是一个无环有向图,其中节点表示离散的随机变量值(True, False),以及变量之间的链接或条件依赖关系。变量之间的关系是确定性的或概率性的。在风险管理的背景下,应该根据专家领域的意见和数据挖掘,综合条件概率,考虑不同事件之间的因果关系(因果关系),从而避免任何安装故障。贝叶斯网络已经成为不确定推理、监测任务(如诊断、预测和决策)的工具。这使得贝叶斯网络成为人工智能的一个研究课题。通过推理对数据进行处理,使我们能够通过观察(证据)的获取进行上下分析,丰富反馈的基础。在本研究中,我们介绍了贝叶斯网络对天然气生产和加工的贡献,并将给出位于阿尔及利亚西部Arzew的液化天然气综合GL4z工业设施的一个组件(锅炉)的应用实例。
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引用次数: 1
期刊
2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)
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