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2016 International Conference on Microelectronics, Computing and Communications (MicroCom)最新文献

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High gain wideband 2×2 microstrip array antenna using RIS and Fabry Perot Cavity resonator 采用RIS和法布里珀罗腔谐振器的高增益宽带2×2微带阵列天线
Sneha Dalvi, Shishir D. Jagtap, Vijaypal Yadav, Rajivkumar Gupta
This paper presents a high gain wide band 2×2 microstrip array antenna. The microstrip array antenna (MSA) is fabricated on inexpensive FR4 substrate and placed 1mm above ground plane to improve the bandwidth and efficiency of the antenna. A reactive impedance surface (RIS) consisting of 13×13 array of 4 mm square patches with inter-element spacing of 1 mm is fabricated on the bottom side of FR4 substrate. RIS reduces the coupling between the ground plane and MSA array and therefore increases the efficiency of antenna. It enhances the bandwidth and gain of the antenna. RIS also helps in reduction of SLL and cross polarization. This MSA array with RIS is place in a Fabry Perot cavity (FPC) resonator to enhance the gain of the antenna. 2×2 and 4×4 array of square parasitic patches are fed by MSA array fabricated on a FR4 superstrate which forms the partially reflecting surface of FPC. The FR4 superstrate layer is supported with help of dielectric rods at the edges with air at about λ0/2 from ground plane. A microstrip feed line network is designed and the printed MSA array is fed by a 50 Ω coaxial probe. The VSWR is <; 2 is obtained over 5.725-6.4 GHz, which covers 5.725-5.875 GHz ISM WLAN frequency band and 5.9-6.4 GHz satellite uplink C band. The antenna gain increases from 12 dB to 15.8 dB as 4×4 square parasitic patches are fabricated on superstrate layer. The gain variation is less than 2 dB over the entire band. The antenna structure provides SLL and cross polarization less than -2ο dB, front to back lobe ratio higher than 20 dB and more than 70 % antenna efficiency. A prototype structure is realized and tested. The measured results satisfy with the simulation results. The antenna can be a suitable candidate for access point, satellite communication, mobile base station antenna and terrestrial communication system.
本文提出了一种高增益宽带2×2微带阵列天线。微带阵列天线(MSA)是在廉价的FR4基板上制作的,并放置在离地平面1mm的位置,以提高天线的带宽和效率。在FR4基板的底部制作了一个由4 mm方形贴片(元件间距为1 mm)组成的13×13阵列的无功阻抗面(RIS)。RIS减小了地平面与MSA阵列之间的耦合,从而提高了天线的效率。提高了天线的带宽和增益。RIS还有助于减少SLL和交叉极化。这种带有RIS的MSA阵列被放置在Fabry Perot腔(FPC)谐振器中以提高天线的增益。通过在FPC的部分反射表面FR4上制备MSA阵列馈电2×2和4×4两组方形寄生斑阵列。FR4上覆层的边缘由介质棒支撑,空气距离地平面约为λ0/2。设计了微带馈线网络,采用50 Ω同轴探头馈电。VSWR <;2在5.725-6.4 GHz频段获得,覆盖5.725-5.875 GHz ISM WLAN频段和5.9-6.4 GHz卫星上行C频段。通过在上覆层上制备4×4方形寄生贴片,使天线增益从12 dB提高到15.8 dB。整个频带的增益变化小于2 dB。该天线结构提供了SLL和交叉极化小于-2ο dB,前后瓣比大于20 dB和70%以上的天线效率。实现了一个原型结构并进行了测试。实测结果与仿真结果基本吻合。该天线可作为接入点、卫星通信、移动基站天线和地面通信系统的合适候选者。
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引用次数: 8
HSRA: Hindi stopword removal algorithm
Vandana Jha, N. Manjunath, P. D. Shenoy, K. Venugopal
In the last few years, electronic documents have been the main source of data in many research areas like Web Mining, Information Retrieval, Artificial Intelligence, Natural Language Processing etc. Text Processing plays a vital role for processing structured or unstructured data from the web. Preprocessing is the main step in any text processing systems. One significant preprocessing technique is the elimination of functional words, also known as stopwords, which affects the performance of text processing tasks. An efficient stopword removal technique is required in all text processing tasks. In this paper, we are proposing a stopword removal algorithm for Hindi Language which is using the concept of a Deterministic Finite Automata (DFA). A large number of available works on stopword removal techniques are based on dictionary containing stopword lists. Then pattern matching technique is applied and the matched patterns, which is a stopword, is removed from the document. It is a time consuming task as searching process takes a long time. This makes the method inefficient and very expensive. In comparison of that, our algorithm has been tested on 200 documents and achieved 99% accuracy and also time efficient.
近年来,电子文档已成为Web挖掘、信息检索、人工智能、自然语言处理等诸多研究领域的主要数据来源。文本处理对于处理来自网络的结构化或非结构化数据起着至关重要的作用。预处理是任何文本处理系统的主要步骤。一种重要的预处理技术是去除功能词,也称为停词,它会影响文本处理任务的性能。在所有的文本处理任务中都需要一种有效的停词去除技术。在本文中,我们提出了一种基于确定性有限自动机(DFA)的印地语停止词去除算法。现有的大量关于停词去除技术的研究都是基于包含停词表的字典。然后应用模式匹配技术,将匹配的模式从文档中删除,即停止词。这是一项耗时的任务,因为搜索过程需要很长时间。这使得该方法效率低下且非常昂贵。与此相比,我们的算法已经在200个文档上进行了测试,准确率达到了99%,而且非常省时。
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引用次数: 30
Microwave frequency quadrupling based on optical intensity modulation 基于光强调制的微波四倍频
Adarsh Jain, R. K. Bahl, A. Banik
Photonic generation of microwave signals is a novel and very attractive for application such as radio-over-fiber for wireless communication, broadband wireless access networks, radar and satellite communications. Photonic microwave frequency multiplication based on external intensity modulation has been considered as an effective solution for frequency tunable microwave and millimeter wave signal generation. In this paper, we analyze and demonstrate a technique for photonically assisted microwave frequency quadrupling. A theoretical analysis to achieve the microwave frequency quadrupling using two cascaded Mach-Zehnder modulators is presented. By this technique, a four-fold microwave or millimeter wave signal are photonically generated without the need for an electrical or optical filter. The detailed simulations are presented in electrical and optical domain to investigate the performance of the developed technique. We have demonstrated experimentally the implementation of a microwave frequency quadrupler in the frequency range of 24 GHz to 34 GHz. The generated microwave signal has a very narrow linewidth along with the feature of wideband frequency tunability.
微波信号的光子产生是一种新颖的、非常有吸引力的应用,如无线通信的光纤无线通信、宽带无线接入网、雷达和卫星通信。基于外强调制的光子微波倍频被认为是频率可调微波和毫米波信号产生的有效解决方案。本文分析并演示了一种光子辅助微波频率四倍的技术。提出了利用两个级联马赫-曾德尔调制器实现微波频率四倍的理论分析。通过这种技术,一个四倍的微波或毫米波信号被光子产生,而不需要一个电子或光学滤波器。在电学和光学领域进行了详细的仿真,以研究所开发的技术的性能。我们通过实验演示了在24 GHz至34 GHz频率范围内实现微波频率四倍器。所产生的微波信号具有很窄的线宽和宽带频率可调性的特点。
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引用次数: 1
A gynocology problem solution by tracking multi moving human sperm using wavelet based mixture of Gaussian approach 基于小波混合高斯方法的多运动精子跟踪妇科问题解决
Sushil Kumar Mahapatra, Sumant Kumar Mohapatra, Sakuntala Mahapatra, Sumit Ghosh
Recently, Scientists needs to know the behavior of human sperm for proper diagnosis in Gymnocology problem. In this paper, we introduced an algorithm for tracking and detecting multi-moving human sperm using wavelet threshold in a improved version. Initially the captured images are filtered by a wavelet denoising approach. Then a combination method of mixture of Gaussian method as background subtraction with synchronized frame difference is developed with high detection rate. The simulation results demonstrate that the proposed algorithm is capable of tracking the sperm, which helps in analysis for proper diagnosis in infertility.
近年来,科学家们需要了解人类精子的行为,以正确诊断裸子学问题。本文介绍了一种改进的小波阈值跟踪和检测多运动精子的算法。首先用小波去噪方法对捕获的图像进行滤波。在此基础上,提出了一种检测率较高的混合高斯法作为背景差与同步帧差的结合方法。仿真结果表明,该算法能够对精子进行跟踪,有助于对不孕症进行正确的诊断。
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引用次数: 2
Design of efficient multicast routing protocol using limited flooding mechanism 基于有限泛洪机制的高效组播路由协议设计
A. Yadav, S. Tripathi
A Mobile Ad-hoc networks (MANETs) is composed of Mobile Nodes without any fixed infrastructure. Multicast routing in mobile Ad-hoc networks (MANETs) have many defiance due to implicit characteristics of the network such as node mobility, reliability, finite network resources etc. So, in this paper we have introduced a new scheme to improve the performance and efficiency of multicast routing protocols. Our proposed scheme is called multicast routing using limited flooding mechanism. This mechanism is integrated over MAODV which enhance the multicast routing efficiency. This mechanism manages the data packets flow based on delay characteristics of the contributing nodes. In proposed scheme only the nodes that satisfy the delay requirement can only flow the data packets from source node to a multicast receivers. The proposed scheme calculates the various types of delay such as transmission delay and propagation delay on each contributing mobile nodes to establish the multicast routes. This scheme is inspired by studied some implicit lacks of existing multicast routing protocols such as: weak robustness of dynamic topology, low reliability, low scalability, lack of QoS (Quality of Service) support, less packet delivery ratio and high packet delivery delay.
移动自组网(manet)由移动节点组成,没有固定的基础设施。由于网络本身具有节点可移动性、可靠性、网络资源有限等隐式特性,使得多播路由在移动自组织网络(manet)中的应用面临诸多挑战。因此,本文提出了一种新的方案来提高组播路由协议的性能和效率。我们提出的方案被称为使用有限泛洪机制的组播路由。该机制集成在MAODV上,提高了组播路由的效率。该机制基于贡献节点的延迟特性对数据包流进行管理。在该方案中,只有满足延迟要求的节点才能将数据包从源节点传输到组播接收者。该方案计算各贡献移动节点的传输时延和传播时延等各种类型的时延,从而建立组播路由。该方案的灵感来源于对现有组播路由协议存在的动态拓扑鲁棒性弱、可靠性低、可扩展性差、缺乏QoS (Quality Service)支持、分组分发率低、分组分发延迟大等隐式缺陷的研究。
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引用次数: 2
Hysteresis in a field-effect device based on an exfoliated thin film of few-layer graphene 基于少层石墨烯剥离薄膜的场效应器件的磁滞现象
S. R. Kasjoo, M. M. Ramli, M. Isa, S. S. Mat Isa, N. Khalid, N. Mohd Noor, N. Ahmad, A. Singh
Graphene has excellent properties that are useful in many electronic device applications. In this report, a mechanical exfoliation method has been used to fabricate a field-effect device based on a thin film of few-layer graphene (FLG). The occurrence of p-doping and hysteresis in the current-voltage behavior was observed and characterized. The possible reasons for this observation were explained and discussed in terms of the sensitivity of graphene to the atmosphere and its surrounding conditions which can cause some effects on the charged carriers in the device.
石墨烯具有优异的性能,在许多电子器件应用中都很有用。在本报告中,采用机械剥离方法制备了基于少层石墨烯薄膜(FLG)的场效应器件。观察和表征了p掺杂和电流-电压行为中的滞后现象。根据石墨烯对大气及其周围条件的敏感性,可以对器件中的带电载流子产生一些影响,解释和讨论了这一观察结果的可能原因。
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引用次数: 0
Performance characterization of matched subspace detector for spectrum sensing 频谱感知匹配子空间检测器的性能表征
Astha Sharma
Matched Subspace Detector (MSD) is a robust detection scheme used for detection of the target primary user signal buried in high-dimensional noise where the target signal is assumed to be placed in low-rank subspace. In this paper we attempt to present the benefits of MSD detector by providing the performance comparison with some other existing blind signal detection techniques and further confirmed detector performance on varying signal dimension and false alarm probabilities. For the scenario when the subspace estimation is done from finite, noisy, signal-bearing training data we propose to use information theoretic criteria (ITC) which highlights the importance of using a critical number of informative components which depends on training phase SNR, system dimension and number of training samples.
匹配子空间检测器(MSD)是一种鲁棒检测方案,用于检测隐藏在高维噪声中的目标主用户信号,假设目标信号处于低秩子空间中。本文通过与现有盲信号检测技术的性能比较,展示了MSD检测器的优点,并进一步证实了该检测器在不同信号维数和虚警概率下的性能。对于从有限的、有噪声的、含信号的训练数据进行子空间估计的情况,我们建议使用信息理论准则(ITC),它强调了使用关键数量的信息成分的重要性,这取决于训练阶段的信噪比、系统维数和训练样本的数量。
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引用次数: 0
ASIC design of signed and unsigned multipliers using compressors 使用压缩器的有符号和无符号乘法器的ASIC设计
R. Abhilash, S. Dubey, M. Chinnaiah
Arithmetic operations are becoming a bigger concern in the digital system for applications like ALU (Arithmetic and Logic Unit) and DSP (Digital Signal Processing). Our work focuses on novel 4-2 and 5-2 Compressors(CM) applied in multiplication architectures such as Unsigned Wallace tree multiplier, Vedic mathematics using Urdhva Triyakbyam sutra, and Signed Baugh-Wooley Wallace tree multiplier, Signed Booth with Radix 2 and Radix 4. The proposed compressors architectures have shown better results when compared with the existing compressors. The ASIC design Implementation was done using Standard cell 180nm CMOS technology and the Verilog HDL code is tested in Xilinx tool, with the help of ISE Simulator (ISim).
在ALU(算术与逻辑单元)和DSP(数字信号处理)等数字系统应用中,算术运算越来越受到关注。我们的工作重点是应用于乘法架构中的新型4-2和5-2压缩器(CM),例如Unsigned Wallace树乘法器,使用Urdhva Triyakbyam经的吠陀数学,以及Signed Baugh-Wooley Wallace树乘法器,带有基数2和基数4的Signed Booth。与现有的压缩机结构相比,所提出的压缩机结构显示出更好的效果。ASIC设计采用标准单元180nm CMOS技术实现,Verilog HDL代码在Xilinx工具中进行测试,并借助ISE模拟器(ISim)。
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引用次数: 3
Selection of wind turbine for MPPT MPPT中风力机的选择
Himani Kala, K. Sandhu
For proper utilization of wind energy it is necessary to drive the wind turbine at maximum power points at all wind speeds. Speed control of rotor is done within the operating range of wind turbines for maximum power point tracking(MPPT). Controllers are used depending upon the range within which the control of rotor angular velocity is required and this range varies for various turbines. Smaller range for rotor speed control supports the economy of controllers. So, for a particular wind energy location, selection of wind turbine should be done in such a manner that it requires minimum speed control to track maximum power during wind variations. In this paper an attempt has been made to analyze the performance of wind turbines for MPPT. Simulation results using MATLAB coding are found to be effective to propose few recommendations for the selection of wind turbines suitable for MPPT.
为了合理利用风能,有必要在所有风速下使风力机处于最大功率点。在风力机运行范围内对转子进行转速控制,实现最大功率点跟踪。控制器的使用取决于需要控制转子角速度的范围,该范围因各种涡轮机而异。较小的转子转速控制范围支持控制器的经济性。因此,对于一个特定的风能位置,风力涡轮机的选择应该以这样的方式进行:在风力变化期间,它需要最小速度控制来跟踪最大功率。本文试图对MPPT风力发电机组的性能进行分析。仿真结果表明MATLAB编码是有效的,对MPPT风力机的选择提出了一些建议。
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引用次数: 6
A register-transfer-level description of synthesizable binary multiplier and binary divider 一种可合成二进制乘法器和二进制除法器的寄存器-传输级描述
Pritam Bhattacharjee, Arindam Sadhu, Kunal Das
The paper depicts the RTL (Register Transfer Level) description of Binary Multiplier and Binary Divider. The descriptions are synchronized to the operating clock of the microprocessor. The major operations that get a highlight in this paper is that the multiplier and divider are synthesizable. VHDL (Very High Specific Integrated Circuit - Hardware Description Language) is the language of construct for the design. This work focuses to show that synchronized applications can be implemented at the front-end level of VLSI design methodology.
本文描述了二进制乘法器和二进制除法器的RTL(寄存器传输电平)描述。这些描述被同步到微处理器的操作时钟。本文重点强调的主要操作是乘法器和除法器的可合成。VHDL (Very High Specific Integrated Circuit - Hardware Description Language)是设计的构造语言。这项工作的重点是表明同步应用可以在VLSI设计方法的前端级别实现。
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引用次数: 1
期刊
2016 International Conference on Microelectronics, Computing and Communications (MicroCom)
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