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2013 International Conference on Emerging Trends in VLSI, Embedded System, Nano Electronics and Telecommunication System (ICEVENT)最新文献

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Closed loop voltage mode control of impedance source inverter (ZSI) 阻抗源逆变器(ZSI)的闭环电压模式控制
G. Shiva, K. Hrishikes, R. Raj
This paper presents the design of Closed loop voltage mode control for impedance-source inverter using Proportional Integral Derivative (PID) controller. The control action is performed by regulating the DC-link voltage at the input side. Mathematical model of the inverter is developed and the control parameters are designed using Bode plot. MATLAB - Simulink model has been developed for simulation. From the results, it was shown that the proposed controller is very well capable to regulate the AC output voltage.
本文提出了采用比例积分导数(PID)控制器对阻抗型逆变器进行闭环电压模式控制的设计。控制动作是通过调节输入端的直流电压来实现的。建立了逆变器的数学模型,并利用波德图设计了控制参数。开发了MATLAB - Simulink模型进行仿真。结果表明,该控制器具有良好的交流输出电压调节能力。
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引用次数: 0
Object removal by region based filling inpainting 基于区域填充的对象移除
N. Neelima, M. Arulvani
Nowadays, an important part of scientific and artistic works is stored in form of film and image archive, so image processing becomes a very important task. A new topic in image processing is image inpainting. Image inpainting is filling in damaged or missed regions in an image in an undetectable form. It has several applications such as image reconstructing, video restoration, special effects and so on. A new algorithm is proposed in this Paper for removing large objects from digital images. The challenge is to fill in the hole that is left behind in a visually plausible way. We propose a best-first algorithm in which the confidence in the synthesized pixel values is propagated in a manner similar to the propagation of information in inpainting. The actual colour values are computed using exemplar-based synthesis. Computational efficiency is achieved by a block based sampling process. A number of examples on real and synthetic images demonstrate the effectiveness of our algorithm in removing large occluding objects. Our results compare favorably to those obtained by existing techniques.
如今,科学和艺术作品的重要组成部分以胶片和图像档案的形式保存,因此图像处理成为一项非常重要的任务。图像绘制是图像处理领域的一个新课题。图像补绘是以一种无法检测的形式填充图像中受损或缺失的区域。它具有图像重建、视频还原、特殊效果等多种应用。本文提出了一种从数字图像中去除大目标的新算法。挑战在于如何以一种视觉上合理的方式填补留下的空白。我们提出了一种最佳优先算法,其中合成像素值的置信度以类似于图像绘制中的信息传播的方式传播。实际的颜色值是使用基于范例的合成来计算的。计算效率是通过基于块的采样过程来实现的。在真实图像和合成图像上的一些例子证明了我们的算法在去除大型遮挡物体方面的有效性。我们的结果与现有技术得到的结果相比是有利的。
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引用次数: 16
Occlusion detection in visual scene using histogram of oriented gradients 基于方向梯度直方图的视觉场景遮挡检测
M., Chitral, Dr. M. Kalaiselvi Geetha, L. Menaka
Object detection is an important step in any video analysis. In this paper, we propose a novel framework for blob based occluded object detection. It detects and tracks the occluded objects in video sequences captured by a fixed camera in crowded scene with occlusion. Moreover the occlusion of an abandoned object is a critical aspect in the video surveillance. We present the system used to identify the abandoned object highlighting how the system can recognize a problem of occlusion and detect the object when it is visible again. Initially Pedestrians are detected using the pedestrian detector by computing the Histogram of Oriented Gradients descriptors (HOG), using a linear Support Vector Machine (SVM) as the classifier. In our system, the background subtraction is modeled by a Mixture of Gaussians technique (MOG). Several experiments were conducted to demonstrate the proposed method using huge video dataset show the robustness and effectiveness.
目标检测是任何视频分析的重要步骤。在本文中,我们提出了一种新的基于blob的遮挡目标检测框架。在拥挤的遮挡场景中,对固定摄像机拍摄的视频序列中的遮挡物体进行检测和跟踪。此外,废弃物体的遮挡也是视频监控中的一个关键问题。我们介绍了用于识别废弃物体的系统,重点介绍了系统如何识别遮挡问题并在物体再次可见时检测物体。首先使用行人检测器通过计算方向梯度描述符直方图(HOG)来检测行人,并使用线性支持向量机(SVM)作为分类器。在我们的系统中,背景减法是由混合高斯技术(MOG)建模的。实验结果表明,该方法具有较好的鲁棒性和有效性。
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引用次数: 0
A novel approach: Voice enabled interface with intelligent voice response system to navigate mobile devices for visually challenged people 一种新颖的方法:具有智能语音响应系统的语音支持界面,为视障人士导航移动设备
R. Michael, B. RajaKumar, S. Swaminathan, M. Ramkumar
Now day's usage mobile devices are increasing in numbers. It can provide a foundation for improving the communication, learning and teaching environments. However, not all potential users have the capabilities that allow them to use the existing methodologies. To improve the search and navigation of various application and features of mobile devices we have proposed a model that entails the hands-free voice navigation system will be helpful for the visually challenged people. This model provides the opportunity to operate the mobile devices without using the keypad.
现在,人们使用的移动设备越来越多。它可以为改善交流、学习和教学环境提供基础。然而,并不是所有的潜在用户都有能力使用现有的方法。为了改善各种应用程序的搜索和导航功能,我们提出了一种模式,其中包括免提语音导航系统,这对视障人士很有帮助。这种模式提供了不使用键盘操作移动设备的机会。
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引用次数: 6
Design of high power Ka band waveguide latching circulator 高功率Ka波段波导锁存环行器的设计
H. M. G. Enagadapa, G. Isola, A. M. Sapkal
In radar systems and other applications circulator is an important component used for isolation or duplexing. In modern polarimetric radars it is required to transmit vertical and horizontal polarization turn by turn while receive both co and cross polarizations to serve this purpose switching (latching) circulator is inevitable device. Three port junction waveguide circulators are most widely used form of the circulators for high power conditions. This paper discusses the design a high power three port waveguide latching circulator at Ka band. The Design is done around centre frequency of 32.5 GHz using HFSS. Design is specifically made with dimension of WR-28 waveguide, so the device can be directly installed in the system using WR-28 waveguide. Isolation in excess of -45 dB is observed and Insertion Loss fraction of a dB is obtained which is quite competent with industrial standards. Latching ferrite H-plane wave guide Y-junction circulator with internal magnetic return paths has widespread applications in radars and radiometers and works as protective devices in microwave receivers.
在雷达系统和其他应用中,环行器是用于隔离或双工的重要部件。在现代极化雷达中,需要轮流发射垂直和水平极化,同时接收共极化和交叉极化,因此开关(锁存)环行器是必不可少的装置。三端口结波导环行器是大功率环行器中应用最广泛的一种。本文讨论了Ka波段高功率三端口波导锁存环行器的设计。该设计是围绕32.5 GHz的中心频率使用HFSS完成的。根据WR-28波导的尺寸进行了专门的设计,因此该器件可以直接安装在使用WR-28波导的系统中。观察到超过-45 dB的隔离,并获得了1 dB的插入损耗分数,这完全符合工业标准。锁存铁氧体h面波导y结内磁回路环行器广泛应用于雷达和辐射计,也可作为微波接收机的保护器件。
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引用次数: 2
Performance analysis of an orthogonal rendezvous routing protocol for wireless mesh networks 无线网状网络正交交会路由协议的性能分析
A. Gandhimathinathan, P. D'Souza, D. Prasad
The increased usage of directional methods of communications (e.g. directional smart antennas [15], Free-Space Optical transceivers [19], and sector antennas) has prompted research into leveraging directionality in every layer of the network stack. In this paper, we learnt how the concept of directionality can be used in layer 3 to facilitate routing under contexts of 1) wireless mesh networks, 2) highly mobile environments, and 3) overlay networks through virtual directions. In the context of wireless mesh networks, we introduce Orthogonal Rendezvous Routing Protocol (ORRP), a lightweight-but-scalable routing protocol utilizing the inherent nature of directional communications to relax information requirements such as coordinate space embedding and node localization. The ORRP source and ORRP destination send route discovery and route dissemination packets respectively in locally-chosen orthogonal directions. We show that ORRP achieves connectivity with high probability even in sparse networks with voids. ORRP scales well without imposing DHT-like graph structures (eg: trees, rings, torus etc). We show that MORRP achieves connectivity with high probability even in highly mobile environments while maintaining only probabilistic information about destinations. MORRP scales well without imposing DHT-like graph structures (eg: trees, rings, torus etc). We will also show that high connectivity can be achieved without the need to frequently disseminate node position resulting increased scalability even in highly mobile environments. We will also evaluate the metrics of reachability, state maintenance, path stretch, end-to-end latency and aggregate network good put under conditions of varying network densities, number of interfaces, and TTL values.
通信定向方法(例如定向智能天线[15]、自由空间光收发器[19]和扇形天线)的使用增加,促使人们研究如何在网络堆栈的每一层利用方向性。在本文中,我们了解了如何在第3层中使用方向性概念来促进以下情况下的路由:1)无线网状网络,2)高度移动环境,以及3)通过虚拟方向覆盖网络。在无线网状网络的背景下,我们介绍了正交交会路由协议(ORRP),这是一种轻量级但可扩展的路由协议,利用定向通信的固有特性来放松坐标空间嵌入和节点定位等信息要求。ORRP源和ORRP目的分别在本地选择的正交方向上发送路由发现和路由传播报文。我们证明了ORRP即使在带有空洞的稀疏网络中也能以高概率实现连通性。ORRP可以很好地扩展,而不需要强加类似dht的图结构(例如:树、环、环等)。我们证明MORRP即使在高度移动的环境中也能以高概率实现连接,同时只保留目的地的概率信息。MORRP可以很好地缩放,而不需要强加dht之类的图结构(例如:树、环、环等)。我们还将展示,即使在高度移动的环境中,也可以在不需要频繁传播节点位置的情况下实现高连接性,从而提高可伸缩性。我们还将在不同的网络密度、接口数量和TTL值的条件下评估可达性、状态维护、路径扩展、端到端延迟和聚合网络性能的指标。
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引用次数: 0
Spectrum sensing review in cognitive radio 认知无线电频谱传感研究进展
K. Seshukumar, R. Saravanan, M. S. Suraj
Cognitive Radio having the great key mechanism of enabling spectrum awareness in the Spectrum sensing. This paper deals with spectrum sensing methods used in a cognitive radio is presented and also deals disadvantages and advantages facing each sensing method. Cognitive radio facing many feature difficulties in spectrum sensing and those are measured by multi-dimensional spectrum sensing. Those tasks are enabling and revised these spectrum sensing approaches. Other alternative methods like Statistical sensing algorithms also discussed here. Moreover, statistical modelling of network utilization and also traffic models are used for estimation of primary user performance. Spectrum sensing uses dynamic spectrum model without troubling the primary users. This may improves the radio frequency usage of spectrum and it is done when both unlicensed and licensed reducing interference and also by usage of licensed users for identifying the white spaces. The concurrence of these circumstances can produce a commands where the signal to noise ratio (SNR) is below the level of detection threshold by use of sensor, and it missed detections at final result. The concept spectrum sensing is important to secondary users in cognitive radio to operate without interfering the primary users. Final review shows cooperative sensing spectrum can improve the performance of cognitive radio network by increasing the efficiency spectrum and providing a detection accuracy better. These benefits come at the cost of increased traffic overhead, complexity, power consumption, and the need for control channels. The idea of cognitive radio is planned to address the issue faced in spectrum efficiency and it provides wireless users to adapt their operating factors and dealings with the help of adjacent radio environment.
认知无线电在频谱感知中具有实现频谱感知的重要机制。本文介绍了在认知无线电中使用的频谱感知方法,并分析了每种感知方法的优缺点。认知无线电在频谱感知中面临着许多特征困难,这些特征是通过多维频谱感知来测量的。这些任务正在实现和修订这些频谱传感方法。本文还讨论了其他替代方法,如统计感知算法。此外,利用网络利用率的统计模型和流量模型来估计主要用户的性能。频谱感知采用动态频谱模型,不影响原始用户。这可以改善频谱的无线电频率使用,当未许可和许可减少干扰时,也可以通过使用许可用户来识别空白区域。这些情况的并发会产生信号噪声比(SNR)低于传感器检测阈值水平的命令,并在最终结果中错过检测。概念频谱感知是认知无线电中辅助用户在不干扰主用户的情况下进行操作的重要手段。研究表明,协同感知频谱可以通过提高频谱效率和提供更好的检测精度来改善认知无线网络的性能。这些好处的代价是增加了通信开销、复杂性、功耗和对控制通道的需求。认知无线电的思想旨在解决频谱效率面临的问题,并为无线用户提供适应其操作因素和处理相邻无线电环境的帮助。
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引用次数: 38
A CAN bus based system for monitoring and fault diagnosis in wind turbine 基于CAN总线的风电机组监测与故障诊断系统
M. Mohanraj, R. Thottungal, K. Jaikumar
Electrical energy can be produced using fossil fuels and also by natural resources. The production of electrical energy using fossil fuels is costlier when compared to natural resources. Solar, wind, thermal and tidal energy are most widely used natural resources for the production of electrical energy. Presently wind energy is most widely used natural resources which could reduce the emission of carbon dioxide. The cost of the wind turbine is extremely higher and work in harsh and unattended environment. Hence the monitoring and the automation of wind turbine are necessary. This paper describes the monitoring and fault diagnosis system for wind turbine using CAN interface. The monitoring parameters and CAN interface are described in detail.
电能可以用化石燃料生产,也可以用自然资源生产。与自然资源相比,使用化石燃料生产电能的成本更高。太阳能、风能、热能和潮汐能是最广泛用于生产电能的自然资源。风能是目前使用最广泛的自然资源,它可以减少二氧化碳的排放。风力涡轮机的成本非常高,工作在恶劣和无人看管的环境中。因此,对风力发电机组进行监测和自动化是必要的。介绍了一种基于CAN接口的风力发电机组监测与故障诊断系统。详细介绍了监控参数和CAN接口。
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引用次数: 15
A comparative analysis in equalization 均衡化的比较分析
A. Grover, Neeti Grover, Keshav Kumar
The demand of wireless communication systems has been increased to greater extent because of offering high throughput, wide coverage, and improved reliability. One of the approaches to achieve these is MIMO systems that can efficiently boost the data transmission rate and improves the system coverage by considering multiple numbers of transmitter and receiver antennas and employing the spatial dimensions. This article focuses on the comparison of equalization techniques for Rician Flat fading and Rayleigh frequency selective fading channel. The performance of these channels based on BER has been considered and it has been found that Rician Flat Fading Channel is the best and Frequency Selective Channel is the worst. It has also been observed that the MMSE and ZF give the worst performance in Rayleigh frequency selective channel as compare to Rician Flat Fading Channel and Rayleigh Flat fading Channel [35]. By analyzing equalization techniques in terms of BER, It has been observed that the successive interference methods outperform the ZF and MMSE however their complexity is higher due to iterative nature of the algorithms. ML provides the better performance in comparison to others. Sphere decoder provides the best performance and the highest decoding complexity as compare to ML and it is the best suited method to remove ISI in Frequency selective fading channel in MIMO systems.
由于无线通信系统的高吞吐量、广覆盖和可靠性的提高,对无线通信系统的需求在更大程度上增加了。实现这些目标的方法之一是MIMO系统,它可以有效地提高数据传输速率,并通过考虑多个发射和接收天线并利用空间维度来提高系统覆盖率。本文重点比较了瑞利频率选择性衰落信道和瑞利平坦衰落信道的均衡技术。对基于误码率的信道性能进行了分析,结果表明,平坦衰落信道性能最好,频率选择信道性能最差。也有研究发现,相对于瑞利平坦衰落信道和瑞利平坦衰落信道,MMSE和ZF在瑞利频率选择信道中表现最差[35]。从误码率的角度分析了逐次干扰均衡技术,发现逐次干扰均衡方法优于ZF和MMSE,但由于算法的迭代特性,其复杂度较高。ML提供了比其他机器更好的性能。与ML相比,球面解码器具有最好的性能和最高的解码复杂度,是MIMO系统中去除频率选择性衰落信道ISI的最佳方法。
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引用次数: 1
Utility of association rule mining: A case study using Weka tool 关联规则挖掘的实用程序:使用Weka工具的案例研究
A. Lekha, C. Srikrishna, Viji Vinod
In this paper a few case studies pertaining to breast cancer, mushroom, larynx cancer and other datasets are studied to find the utility of association rule mining using Weka tool. Three association algorithms - Apriori, PredictiveApriori and Tertius Algorithms are employed to discuss different case studies. A comparative study of the three algorithms is also made. Further architecture for implementing the association rules on datasets using Weka is also given. The analysis reveals that although the implementation of the three algorithms gives the strong association rules they have problems with the number of cycles taken to generate the frequent itemsets, minimum support needed, memory utilized and non-numeric data.
本文通过对乳腺癌、蘑菇、喉癌等数据集的案例研究,探讨了使用Weka工具进行关联规则挖掘的实用性。三种关联算法- Apriori, PredictiveApriori和Tertius算法被用来讨论不同的案例研究。并对三种算法进行了比较研究。给出了使用Weka实现数据集关联规则的进一步体系结构。分析表明,虽然这三种算法的实现给出了强关联规则,但它们在生成频繁项集所需的周期数、所需的最小支持、所使用的内存和非数字数据方面存在问题。
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引用次数: 8
期刊
2013 International Conference on Emerging Trends in VLSI, Embedded System, Nano Electronics and Telecommunication System (ICEVENT)
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