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2015 Fifth International Conference on Advances in Computing and Communications (ICACC)最新文献

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Image Denoising Using Multiresolution Analysis and Nonlinear Filtering 基于多分辨率分析和非线性滤波的图像去噪
S. Malini, R. Moni
In multiresolution analysis, image is analyzed at different resolutions of pixels. The features in an image appear at different resolutions in different forms. Hence separation of features in the image is possible. In denoising problems, signal and noise can be separated in the process and hence elimination of noise becomes easier. It is proposed in this paper that when a nonlinear median filter is used in multiresolution environment, once in full resolution and then with half resolution, denoising becomes more perfect. This technique is a non linear processing and is found to be useful in reducing not only impulse noise but also Gaussian and Speckle noise. Further, it is also proposed that use of a nonlinear adaptive median filter produces more pleasing image with better denoising. It is also shown that the proposed method is useful for color image denoising too.
在多分辨率分析中,以不同分辨率的像素对图像进行分析。图像中的特征以不同的形式以不同的分辨率出现。因此,分离图像中的特征是可能的。在去噪问题中,信号和噪声可以在过程中分离,从而使噪声的消除变得更加容易。本文提出在多分辨率环境下使用非线性中值滤波器,一次全分辨率,再一次半分辨率,使去噪更加完美。该技术是一种非线性处理方法,不仅可以有效地降低脉冲噪声,还可以有效地降低高斯噪声和散斑噪声。此外,还提出了使用非线性自适应中值滤波器产生更令人满意的图像和更好的去噪。实验结果表明,该方法对彩色图像去噪也是有效的。
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引用次数: 5
Implementation of Particle Filters for Single Target Tracking Using CUDA 基于CUDA的单目标跟踪粒子滤波实现
Bhavya Goyal, Tarun Budhraja, Roheet Bhatnagar, C. Shivakumar
In order to implement Sequential Bayesian estimator using Monte carlo simulation and to get rid of limitations of Kalman filter, Particle filtering techniques plays a very crucial role for target tracking applications in state space where Importance sampling approximately distributed by posterior distribution with multimodel feature and robustness to noise. However as the particles becomes very large, the Monte Carlo representation becomes nearly equivalent to analytical description characterization for posterior distributions and has some deficiencies such as high computational cost and low sampling efficiency. Therefore, emerging computing platform, CUDA may be regarded as most appealing platform for such implementaion. Representation provided with set of samples for target distribution of state leads to increase in sampling efficiency so that graphics processing unit (GPUPU) becomes more appealing to use in Particle filter. The modification on mapping architecture are evaluated with qualitative analysis. The proposed design will be 3.5 times faster than direct design.
为了利用蒙特卡罗模拟实现序列贝叶斯估计,摆脱卡尔曼滤波的局限性,粒子滤波技术在状态空间的目标跟踪应用中起着至关重要的作用,在状态空间中,重要性采样近似分布为后验分布,具有多模型特征和对噪声的鲁棒性。然而,当粒子变得非常大时,蒙特卡罗表示几乎等同于后验分布的解析描述表征,并且存在计算成本高、采样效率低等不足。因此,在新兴的计算平台中,CUDA可能被认为是最吸引人的实现平台。为状态的目标分布提供一组采样表示,提高了采样效率,使得图形处理单元(gpu)在粒子滤波中的应用更具吸引力。用定性分析的方法对映射体系结构的修改进行了评价。提出的设计将比直接设计快3.5倍。
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引用次数: 8
High Gain Coplanar Feed Ultra Wide Band Wearable Antenna Using Artificial Magnetic Conductors 利用人工磁性导体的高增益共面馈电超宽带可穿戴天线
Ajith Jose, Shona J. Kappan
An Ultra wide band wearable antenna with coplanar waveguide feed is presented in this paper. The antenna was designed and fabricated in jeans substrate. A coplanar feed of 50 Ohm impedance was used so as to provide the antenna a uniplanar structure. The simulation results showed ultra wide band characteristics with return loss below -10dB for the entire band of 3.1GHz to 10.6GHz. The antenna was fabricated using copper tape with the geometry of antenna etched on it. The return loss of the fabricated antenna was measured for a frequency of 3GHz to 8GHz. Over this range the antenna return loss was found to be below -10dB and was found to be in agreement with the simulated results. In order to increase the gain of the antenna Artificial Magnetic Conductor (AMC) was used. It was found to be exhibiting AMC characteristics at multiple frequencies. This was attached to antenna geometry and simulation studies were carried out. The simulated results showed an increase in antenna gain.
提出了一种共面波导馈电的超宽带可穿戴天线。在牛仔衬底上设计并制作了天线。采用50欧姆阻抗共面馈电,使天线具有单平面结构。仿真结果表明,在3.1GHz ~ 10.6GHz全频段内,回波损耗低于-10dB,具有超宽带特性。天线是用铜带制作的,天线的几何形状蚀刻在铜带上。测量了该天线在3GHz ~ 8GHz频率范围内的回波损耗。在此范围内,天线回波损耗低于-10dB,与模拟结果一致。为了提高天线的增益,采用了人工磁导体。发现它在多个频率上表现出AMC特征。这是附加的天线几何和模拟研究进行了。仿真结果表明,天线增益有所增加。
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引用次数: 3
A Linguistic Color Space for Image Enhancemenet 一种用于图像增强的语言色彩空间
R. Chandrasekharan, M. Sasikumar
Color is an evitable feature of image and its prediction is still a critical issue in computer vision and image processing. It is necessary to ensure that the perceived color of an object remains constant under varying conditions. Novelty of this paper lies in introduction of a linguistic color space using mamdani's fuzzy inference system for better color constancy and image enhancement. We define different types of membership functions with minimum number of inference rules to map RGB components to linguistic color space. Also, psychophysically measured colors are represented in terms of linguistic variables. While evaluating the algorithm, it is clear that this algorithm rivals current state of art performance without the help of training data. In addition, this method can be used for clouddetection of aerial images, thus opening further research in aerial image processing.
颜色是图像不可避免的特征,其预测仍然是计算机视觉和图像处理中的一个关键问题。有必要确保物体的感知颜色在不同条件下保持不变。本文的新颖之处在于利用mamdani的模糊推理系统引入语言色彩空间,以获得更好的色彩稳定性和图像增强效果。我们用最少数量的推理规则定义不同类型的隶属函数,将RGB组件映射到语言色彩空间。此外,心理物理测量的颜色用语言变量表示。在评估算法时,很明显,该算法在没有训练数据帮助的情况下可以媲美当前最先进的性能。此外,该方法可用于航空图像的云检测,从而为航空图像处理开辟了进一步的研究。
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引用次数: 0
Performance Analysis of Big Data Gathering in Wireless Sensor Network Using an EM Based Clustering Scheme 基于EM聚类方案的无线传感器网络大数据采集性能分析
K. Remesh Babu, G. Suja, P. Samuel, S. Jos
Big-data is a popular term in the field of information and communication technology. Wireless Sensor Networks (WSN) is one of the eminent contributors of big data. WSN contains numerous sensor nodes that cooperatively monitor an environment. Each network consists of sensor node, memory, and communication device. Data generated by single sensor node is small but data generated by distributed sensor network is significantly large and it is termed as big-data. The critical issue in WSN is energy consumption and data gathering. This paper mainly focus on Expectation Maximization (EM) based clustering scheme implementation and the performance analysis of WSN using single mobile sink to eight mobile sink. From the analysis we also derived a relationship between the number of mobile sinks required for a particular network with a given number of sensor nodes. Experimental results show that the number of mobile sinks is also an important parameter to efficiently gather information in WSN.
大数据是信息通信技术领域的一个流行术语。无线传感器网络(WSN)是大数据的杰出贡献者之一。WSN包含许多传感器节点,它们相互协作监视环境。每个网络由传感器节点、存储器和通信设备组成。单个传感器节点产生的数据量很小,而分布式传感器网络产生的数据量非常大,被称为大数据。无线传感器网络的关键问题是能量消耗和数据采集。本文主要研究了基于期望最大化(EM)的无线传感器网络聚类方案的实现以及单移动sink到8移动sink的性能分析。从分析中,我们还推导出具有给定数量传感器节点的特定网络所需的移动接收器数量之间的关系。实验结果表明,在无线传感器网络中,移动接收器的数量也是有效收集信息的重要参数。
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引用次数: 7
Fuzzy Cautious Adaptive Random Early Detection for Heterogeneous Network 异构网络模糊谨慎自适应随机早期检测
S. Ravindra, Ashwini B. Patil
Heterogeneous Network consists of wired and wireless network. In these networks, congestion control and quality of service is major issue. Due to this issues, delay and jitter are increased which decreases the performance of network. For reducing this issues there are various queue management techniques which are classified as Active Queue Management and Passive Queue Management. AQM consists of access routers which are used to detect congestion. Working principle of AQM is very effective for congestion control. AQM such as Random Early Detection (RED), has various types such as Adaptive-RED (ARED), Refined-ARED (RE-ARED), Combination of ARED, RE-ARED is Cautious Adaptive RED (CARED). In this paper, CARED is designed for Heterogeneous network. CARED has dynamically changing maximum drop probability (maxp) depends upon level of traffic load. FUZZY-CARED is designed to improve CARED in which maxp cautiously increases and decreases after detecting congestion in the network. The proposed work aims to keep average queue length (newavg) around required target range by cautiously selecting increase maxp on current traffic load. The simulation results shows comparison of ARED, CARED and FUZZY-CARED in which FUZZY-CARED gives better results than ARED, CARED.
异构网络包括有线网络和无线网络。在这些网络中,拥塞控制和服务质量是主要问题。由于这个问题,延迟和抖动增加,降低了网络的性能。为了减少这个问题,有各种队列管理技术,分为主动队列管理和被动队列管理。AQM由用于检测拥塞的访问路由器组成。AQM的工作原理对拥塞控制非常有效。AQM如随机早期检测(RED),有多种类型,如自适应红色(RED),精炼红色(re -RED),组合红色(re -RED),谨慎自适应红色(care)。本文针对异构网络设计了一种新型的关怀网络。care具有动态变化的最大掉落概率(maxp),取决于交通负载水平。fuzzy - care是为了改进care算法而设计的,在该算法中,maxp在检测到网络拥塞后谨慎地增加和减少。本文提出的工作旨在通过在当前交通负载下谨慎选择增加最大值,使平均队列长度(newavg)保持在所需的目标范围内。仿真结果表明,通过对ARED、care和fuzzy - care的比较,fuzzy - care的效果优于ARED、care。
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引用次数: 0
A 2.4 GHz Polarization Reconfigurable Metasurface Antenna 2.4 GHz极化可重构超表面天线
Najla Mohammed Sali, B. Paul
A metasurface (MS) antenna that allows polarization reconfigurability is proposed. The MS antenna is formed by a MS and source antenna, separated by a small air gap. The MS consists of 16 identical unit cells on a substrate, where each unit cell used is a corner truncated square patch. A microstrip fed slot antenna (MFSA) is used as the source antenna. The MS converts the linearly polarized (LP) signal generated by the MFSA into a circularly polarized (CP) signal with wider return loss bandwidth(RLBW). By rotating the MS relative to the MFSA, different polarizations could be achieved. For verification of simulation results, the MS antennas are fabricated and measured. Simulated and measured results show good agreements. The MS antenna has an operating frequency of 2.4 GHz, suitable for WLAN applications.
提出了一种允许极化可重构的超表面天线。质谱天线由质谱天线和源天线组成,由一个小气隙隔开。质谱由衬底上的16个相同的单位细胞组成,其中每个单位细胞是一个角截断的正方形补丁。源天线采用微带馈电槽天线(MFSA)。MS将MFSA产生的线极化(LP)信号转换成具有更宽回波损耗带宽(RLBW)的圆极化(CP)信号。通过旋转MS相对于MFSA,可以实现不同的极化。为了验证仿真结果,制作并测量了MS天线。仿真结果与实测结果吻合良好。MS天线的工作频率为2.4 GHz,适用于WLAN应用。
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引用次数: 5
A Cost Effective Hybrid-Log Periodic Dipole Antenna (H-LPDA) 一种性价比高的混合对数周期偶极子天线(H-LPDA)
Jerin Jose, T. Mathew, A. Thomas, N. Haripriya, Mahima Cherian, D. D. Krishna
This paper presents a hybrid-log periodic dipole antenna (H-LPDA) which is a cost effective alternative to the regular planar-log periodic dipole antenna (PLPDA) . In case of a PLPDA, required substrate dimensions increases with bandwidth as we have to accommodate dipoles of shortest dimensions to the longest. In order to make the antenna more cost effective in terms of the high frequency substrates used, a 3D structure is incorporated with the PLPDA while keeping the overall dimension as well as the performance same as the original PLPDA. In this paper, a PLPDA designed to operate over 700MHz - 4.5GHz is replaced by the proposed H-LPDA design. The design is simulated, fabricated and measured. The antenna is found to have performance similar to that of the original PLPDA antenna with good impedance matching (VSWR<;2) and a stable radiation pattern with a gain of 6.5dB over the desired operating band.
本文提出了一种混合对数周期偶极子天线(H-LPDA),它是常规平面对数周期偶极子天线(PLPDA)的一种经济有效的替代方案。在PLPDA的情况下,所需的衬底尺寸随着带宽的增加而增加,因为我们必须容纳最短尺寸到最长尺寸的偶极子。为了使天线在使用高频基板方面更具成本效益,PLPDA采用了3D结构,同时保持了整体尺寸和性能与原始PLPDA相同。在本文中,设计工作在700MHz - 4.5GHz的PLPDA被提出的H-LPDA设计所取代。对设计进行了仿真、制作和测量。该天线的性能与原PLPDA天线相似,阻抗匹配良好(驻波比<;2),辐射方向图稳定,在期望的工作频带上增益为6.5dB。
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引用次数: 2
Broadband 90° Isosceles Triangular Microstrip Antenna 宽带90°等腰三角形微带天线
A. Deshmukh, Shafin Nagarbowdi, A. Desai, S. Shaikh, K. Lele, K. Ray
Broadband 90° isosceles triangular microstrip antenna derived from equivalent equilateral triangular microstrip antenna, is proposed. The parametric study for variation in isosceles angle from 50° to 90° is presented. The increasing angle tunes the spacing between TM10 and TM11 modes of the triangular patch to realize broadband response. The simulated and measured bandwidth of more than 600 MHz (> 45%) is obtained. This is more than the bandwidth realized in equilateral triangular microstrip antenna. The proposed 90° isosceles patch yields broadside radiation pattern with gain of more than 6 dBi over entire bandwidth.
在等效等边三角形微带天线的基础上,提出了一种宽带90°等腰三角形微带天线。对等腰角在50°~ 90°范围内的变化进行了参数化研究。增加的角度调节三角形贴片TM10和TM11模式之间的间距,实现宽带响应。仿真和实测带宽均大于600mhz(> 45%)。这超过了等边三角形微带天线所能实现的带宽。所提出的90°等腰贴片在整个带宽上产生增益超过6 dBi的宽侧辐射方向图。
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引用次数: 1
Tamil to Malayalam Transliteration 泰米尔语到马拉雅拉姆语的音译
K. Raju, T. Sreerekha, P. Vidya, Rajeev R R, P. C. Reghu Raj
Transliteration forms an essential part of transcription which converts text from one writing system to another. The need for translating data has become larger than before as the world is getting together through social media. Machine transliteration has emerged as a part of information retrieval and machine translation projects to translate named entities, that are not registered in the dictionary, based on phonemes and graphemes. This paper proposes a machine learning technique that performs transliteration from Tamil to Malayalam, two languages that belong to Dravidian family. Transliteration can be used to supplement machine translation process by handling the issues that can happen due to the presence of named entities.
音译是将文本从一种书写系统转换为另一种书写系统的重要组成部分。随着世界通过社交媒体联系在一起,翻译数据的需求比以前更大了。机器音译已成为信息检索和机器翻译项目的一部分,用于根据音素和字素翻译未在词典中注册的命名实体。本文提出了一种机器学习技术,可以将泰米尔语和马拉雅拉姆语这两种属于德拉威语系的语言进行音译。音译可用于通过处理由于命名实体的存在而可能发生的问题来补充机器翻译过程。
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引用次数: 1
期刊
2015 Fifth International Conference on Advances in Computing and Communications (ICACC)
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