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2012 Third International Conference on Computing, Communication and Networking Technologies (ICCCNT'12)最新文献

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Remote student localization using audio and video processing for synchronous interactive e-learning 使用音频和视频处理进行同步交互式电子学习的远程学生定位
B. Hariharan, Aparna Vadakkepatt, Sangeeth Kumar
The advancements in the field of wireless technology has led to a widespread acceptance of multimedia on wireless networks. The increasing popularity of multimedia networking applications such as e-learning has brought in more requirements in educational institutions for the students to learn online Current e-learning systems do not facilitate synchronous learning i.e., there is no interaction like that of a real class. However to impart effective learning, interaction between a student in the remote class-room and the teacher in the main classroom is mandatory. To enhance this virtual classroom, an automatic e-learning system is been proposed. Wireless technology which consists of collection of audio and video sensors tracks and identifies the speaker of interest in the classroom so that the lecturer on the other end will be able to effectively interact and can have a one to one communication with the focused student. We describe in this paper an automated system for student localization using audio and video processing, as a first step towards achieving such an automated system.
无线技术领域的进步使得无线网络上的多媒体得到了广泛的接受。随着电子学习等多媒体网络应用的日益普及,对教育机构的在线学习提出了更高的要求。目前的电子学习系统不能实现同步学习,即没有像真实课堂那样的互动。然而,为了传授有效的学习,远程教室的学生和主教室的老师之间的互动是必须的。为了增强虚拟课堂的功能,提出了一种自动电子学习系统。无线技术由音频和视频传感器的集合组成,可以跟踪和识别教室中感兴趣的演讲者,以便另一端的讲师能够有效地互动,并可以与专注的学生进行一对一的交流。我们在本文中描述了一个使用音频和视频处理的学生定位自动化系统,作为实现这种自动化系统的第一步。
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引用次数: 3
On secure multiple image watermarking techniques using DWT 基于小波变换的安全多重图像水印技术研究
B. Sridhar, C. Arun
Image watermarking particularly has attracted lot of attention in the research community. In this paper we propose a multiple watermarking based on DWT with the motivation to maintain the quality of the image. The original image was interlacing into even and odd rows of images and deinterlaces the two images. For hiding watermark images wavelet based approach is employed in two deinterlace images. Stack the two watermarked images in to single image by introducing zeros of even and odd rows in the two watermarked images, At the end again interlacing and deinterlacing of an images and extracts both the watermark Images. Simulation results show the watermark imperceptibility and robustness. Also the quality of the watermarked image is excellent and there is strong resistant against many geometrical attacks.
图像水印技术尤其受到了学术界的广泛关注。本文提出了一种基于小波变换的多重水印算法,其目的是为了保持图像的质量。原始图像被交错成偶数行和奇数行图像,并将两个图像去交错。对于水印图像的隐藏,采用了基于小波变换的去隔行图像处理方法。通过在两幅水印图像中引入偶数行和奇数行零,将两幅水印图像叠加成一幅图像,最后对一幅图像再次进行隔行和去隔行处理,提取出两幅水印图像。仿真结果表明,该算法具有良好的水印不可感知性和鲁棒性。水印图像质量好,对多种几何攻击具有较强的抵抗能力。
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引用次数: 20
An efficient shadow detection method for high resolution satellite images 一种高效的高分辨率卫星图像阴影检测方法
Lizy Abraham, Dr. M. Sasikumar
The problem of shadowing is particularly significant in high-resolution satellite imaging (HRSI) which causes either a reduction or total loss of information in the image. The research on segmenting shadow regions is of great significance for image interpretation and it is a supportive tool to detect manmade structures. This paper proposes a solution to the problem of automatic extraction of shadow features in color satellite images with high spatial resolution. The algorithm separates shadow from non-shadow by considering the spatial properties of the segmented regions. Experiments are executed on high resolution satellite images, and the results confirm the validity of the proposed method.
在高分辨率卫星成像(HRSI)中,阴影问题尤其严重,它会导致图像中的信息减少或完全丢失。阴影区域分割的研究对图像解译具有重要意义,是人工结构检测的辅助工具。针对高空间分辨率彩色卫星图像阴影特征的自动提取问题,提出了一种解决方案。该算法通过考虑分割区域的空间属性来区分阴影和非阴影。在高分辨率卫星图像上进行了实验,结果验证了该方法的有效性。
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引用次数: 4
BER performance and bandwidth efficiency analysis of fixed WIMAX 固定WIMAX的误码率性能及带宽效率分析
V. Sekar, P. Veerapagounder, B. Baskaran
Worldwide Interoperability for Microwave Access is an emerging global broadband wireless system based on IEEE 802.16 standards. This paper investigates several modulation techniques for IEEE 802.16d (fixed WIMAX) based OFDM system including BPSK, QPSK, 16QAM and 64QAM with different cyclic prefix are tested for SUI-1 and SUI-2 channel conditions with channel bandwidth of 1.75MHz. For poor channel conditions, QPSK with 0.25 cyclic prefix is best modulation technique with least BER and, for good channel conditions 16QAM or 64QAM can be used. The effective bandwidth of the transmitted signal in wireless MAN-OFDM is also analysed and it is fall in the range of 87.29 %to 90.45%.
微波接入的全球互操作性是基于IEEE 802.16标准的新兴全球宽带无线系统。本文研究了几种基于IEEE 802.16d(固定WIMAX)的OFDM系统的调制技术,包括BPSK、QPSK、16QAM和64QAM不同的循环前缀,并在信道带宽为1.75MHz的SUI-1和SUI-2信道条件下进行了测试。对于较差的信道条件,具有0.25循环前缀的QPSK是具有最小误码率的最佳调制技术,对于良好的信道条件,可以使用16QAM或64QAM。对无线MAN-OFDM传输信号的有效带宽进行了分析,其范围为87.29% ~ 90.45%。
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引用次数: 3
Implantable CPW fed dual folded dipole antenna for biomedical applications 生物医学应用的可植入CPW馈入双折叠偶极子天线
S. A. Kumar, T. Shanmuganantham
A implantable CPW fed dual folded dipole antenna operating in the ISM band (2.4-2.48 GHz) and WMTS (1.4-1.43 GHz) for biomedical applications. The proposed antenna is made compatible for implantation by embedding it in a biocompatible Poly Dimethyl Siloxane (PDMS). A study of sensitivity of the antenna performance as a function of the dielectric parameters of the environment in which it is immersed was performed. The proposed antenna is simulated using the method of moment's software IE3D by assuming the predetermined dielectric constant for the human muscle tissue, fat and skin and the parameters of the antenna such as return loss, radiation pattern, and VSWR are plotted.
一种可植入的CPW馈电双折叠偶极子天线,工作在ISM频段(2.4-2.48 GHz)和WMTS频段(1.4-1.43 GHz),用于生物医学应用。通过将所提出的天线嵌入生物相容性聚二甲基硅氧烷(PDMS)中,使其与植入相兼容。研究了天线性能随其所处环境的介电参数变化的灵敏度。假设人体肌肉组织、脂肪和皮肤的预定介电常数,并绘制天线的回波损耗、辐射方向图和驻波比等参数,利用矩量软件IE3D对天线进行了仿真。
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引用次数: 14
Computational techniques for classification of military vehicles using seismic signatures 基于地震特征的军用车辆分类计算技术
P. Chakraborty, S. Kumar, R. Ghosh, A. Akula, H. K. Sardana
In this research work a seismic classification system is designed to distinguish between tracked and wheeled vehicle classes. Owing to the extreme non-stationary nature of seismic signals, choosing robust features is an important aspect for the purpose of classification. To obtain a varied feature set different signal processing techniques namely Fast Fourier Transform (FFT), Walsh-Hadamard Transform (WHT), Hilbert-Huang Transform (HHT) and Wavelet Transform (WT) are investigated. Dominant features are identified from the feature bank using Principal Component Analysis (PCA). This choice of optimal and robust features leads to a better class discrimination. It is observed that the classification results obtained by the varied feature set followed by optimization has improved classification accuracy of 95% than using features extracted from individual signal processing techniques.
在本研究中,设计了一种用于区分履带式车辆和轮式车辆的地震分类系统。由于地震信号具有极强的非平稳性,选取鲁棒特征是实现地震信号分类的一个重要方面。为了获得不同的特征集,研究了不同的信号处理技术,即快速傅里叶变换(FFT)、沃尔什-阿达玛变换(WHT)、希尔伯特-黄变换(HHT)和小波变换(WT)。使用主成分分析(PCA)从特征库中识别主导特征。这种最优和鲁棒特征的选择导致了更好的阶级区分。观察到,与使用单个信号处理技术提取特征相比,通过变化特征集并进行优化得到的分类结果的分类准确率提高了95%。
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引用次数: 3
A STATCOM based control scheme for grid connected wind driven induction generator 一种基于STATCOM的并网风力感应发电机控制方案
N. Sumathy, S. Prakash
As a promising renewable alternative, the wind power is one of the significant source of generation. Reactive power compensation in a low voltage distribution networks for integration of wind power to the grid is the main concern of this paper. This paper proposes a control scheme based on instantaneous pq theory for compensating the reactive power requirement of a three phase grid connected wind driven induction generator as well as the load connected to the PCC using STATCOM. The proposed control scheme is simulated using MATLAB/SIMULINK. The Simulation results are also presented in this paper.
风能作为一种很有前途的可再生能源,是发电的重要来源之一。本文主要研究风电并网低压配电网的无功补偿问题。本文提出了一种基于瞬时pq理论的三相并网风力感应发电机无功补偿方案,并利用STATCOM实现了对PCC负载的无功补偿。采用MATLAB/SIMULINK对所提出的控制方案进行了仿真。文中还给出了仿真结果。
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引用次数: 6
Adaptive Hybrid Harmony Search algorithm for optimal design of laminate composites 层合复合材料优化设计的自适应混合和谐搜索算法
K. Lakshmi, A. Rao
In this paper, a meta-heuristic approach called Adaptive Hybrid Harmony Search algorithm (AHHS), which is a variant of recently developed Harmony search optimisation algorithm is proposed. The harmony search is basically conceptualized using the musical process of searching for a perfect state of harmony. The proposed algorithm is hybridised with a customised neighbourhood search algorithm called `Variable depth neighbourhood search', to improve its intensification mechanism. This proposed algorithm is applied to a combinatorial problem namely lay-up sequence optimisation of laminate composite stiffened cylinder. The results of the investigated numerical example, clearly illustrate the efficiency of the proposed algorithm to handle the design of layup sequence problem.
本文提出了一种元启发式的自适应混合和谐搜索算法(AHHS),它是最近发展的和谐搜索优化算法的一种变体。和声搜索基本上是用寻找完美和谐状态的音乐过程来概念化的。该算法与自定义邻域搜索算法“变深度邻域搜索”相结合,改进了算法的增强机制。将该算法应用于复合材料加筋圆柱层合层序优化这一组合问题。数值算例的研究结果清楚地说明了该算法在处理叠置序列设计问题方面的有效性。
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引用次数: 2
Context aware routing in Distributed Sensor Networks for data gathering and dissemination 分布式传感器网络中用于数据收集和传播的上下文感知路由
L. B. Bhajantri, N. Nalini, V. Patil
This paper proposes a context aware routing in distributed sensor network for data gathering and dissemination. A Distributed Sensor Network (DSN) is composed of intelligent sensors that are geographically dispersed in the region of interest and interconnected through a communication network. The (acoustic, seismic, and infrared) data by leaf sensor nodes are transmitted over the network and integrated at the processing element to derive appropriate interferences about the environment for different purposes, such as target tracking, location, surveillance and so on. Since a DSN is typically deployed for remote operations in unstructured area and the measurements are usually collected in a harsh, unreliable, and even adversarial environment, it is critical to provide extended networking capability to guarantee the performance of the entire system. In this work, we consider different contexts in distributed sensors network by considering the scenario of forest area such as: temperature context, air pressure context and object aware context. This work mainly focuses on routing the data from source to sink, and gathering and dissemination of related data. In this work, data aggregation is done in two phase: In first phase data is aggregated in Data Aggregator (DA) and in second phase data is aggregated in Master Aggregator (MA). If the context is in the emergency level then data is disseminated to target area. We simulated the context aware routing for data gathering and dissemination to test the operation scheme in terms of performance parameters.
本文提出了一种分布式传感器网络中用于数据采集和分发的上下文感知路由。分布式传感器网络(DSN)由地理上分散在感兴趣区域的智能传感器组成,并通过通信网络相互连接。叶片传感器节点的(声、震、红外)数据通过网络传输,并在处理单元进行整合,得出对环境的适当干扰,用于不同目的,如目标跟踪、定位、监视等。由于DSN通常用于非结构化区域的远程操作,并且通常在恶劣、不可靠甚至敌对的环境中收集测量数据,因此提供扩展的网络功能以保证整个系统的性能至关重要。在这项工作中,我们通过考虑森林区域的场景来考虑分布式传感器网络中的不同环境,例如:温度环境、气压环境和物体感知环境。这项工作主要集中在数据从源到汇的路由,以及相关数据的收集和传播。在这项工作中,数据聚合分两个阶段完成:第一阶段数据在数据聚合器(data Aggregator, DA)中聚合,第二阶段数据在主聚合器(Master Aggregator, MA)中聚合。如果情况属于紧急级别,则将数据传播到目标地区。我们模拟了上下文感知路由的数据收集和分发,以测试操作方案在性能参数方面的性能。
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引用次数: 2
Energy efficiency and network lifetime maximization in wireless sensor networks using Improved Ant Colony Optimization 基于改进蚁群优化的无线传感器网络能源效率和网络寿命最大化
N. V. Anil Kumar, A. Thomas
Improving network lifetime is the fundamental challenge of wireless sensor networks. One possible solution consists in making use of mobile sinks. Sink mobility along a constrained path can improve the energy efficiency in wireless sensor networks. However, due to the path constraint, a mobile sink with constant speed has limited communication time to collect data from the sensor nodes deployed randomly. This poses significant challenges in jointly improving the amount of data collected and reducing the energy consumption. This paper propose a novel data collection scheme, called the Maximum Amount Shortest Path (MASP) using Improved Ant Colony Optimization, to address this issue, that increases network throughput as well as conserves energy by optimizing the assignment of sensor nodes. MASP is formulated as an integer linear programming problem and then solved with the help of improved ant colony optimization. Zone based partition is applied to implement the MASP scheme. The residual energy of each node is calculated and the optimal path is selected by considering the shortest path, residual energy, channel noise, and delay. This approach is validated through simulation experiments using NS2.
提高网络寿命是无线传感器网络面临的根本挑战。一个可能的解决办法是利用移动水槽。在无线传感器网络中,Sink沿受限路径移动可以提高能量效率。然而,由于路径的限制,恒速移动sink从随机部署的传感器节点收集数据的通信时间有限。这对共同提高数据收集量和降低能源消耗提出了重大挑战。本文提出了一种新的数据收集方案,称为最大数量最短路径(MASP),使用改进的蚁群优化来解决这个问题,该方案通过优化传感器节点的分配来提高网络吞吐量并节省能量。将MASP问题表述为一个整数线性规划问题,并利用改进蚁群算法求解。MASP方案采用基于分区的方式实现。计算每个节点的剩余能量,综合考虑最短路径、剩余能量、信道噪声和时延,选择最优路径。通过NS2的仿真实验验证了该方法的有效性。
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引用次数: 19
期刊
2012 Third International Conference on Computing, Communication and Networking Technologies (ICCCNT'12)
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