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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 Adaptive PCA and SVD 基于自适应PCA和SVD的图像去噪
Rithu James, Anita Mariam Jolly, C. Anjali, Dimple Michael
The effectiveness of an image denoising algorithm depends upon how the signal is represented in it. A lot of work has been done in the field of image denoising already, but there is a lot of scope for further investigation as well. In this paper, a simple, efficient Patch based and Block based image denoising algorithms, where the noisy image patches are represented using Principal Components and Singular Values is presented. From the conventional Principal Component Analysis (PCA) based denoising algorithm two improved versions of denoising algorithm were developed using patch based and block based Singular Value Decomposition (SVD). These techniques were found to work excellently on images affected by different kinds of noises. A comparison of the three methods using a quantitative analysis in terms of PSNR and RMSE is done.
图像去噪算法的有效性取决于信号在其中的表示方式。在图像去噪领域已经做了大量的工作,但也有很大的研究空间。本文提出了一种简单、高效的基于Patch和基于Block的图像去噪算法,其中用主成分和奇异值表示带有噪声的图像Patch。在传统的基于主成分分析(PCA)去噪算法的基础上,提出了基于补丁和基于块的奇异值分解(SVD)去噪算法的改进版本。人们发现,这些技术在处理受各种噪声影响的图像时效果非常好。通过对三种方法的PSNR和RMSE的定量分析,进行了比较。
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引用次数: 7
Double Step Junction Coupled Waveguide Fed Dielectric Resonator Antenna 双阶结耦合波导馈电介质谐振器天线
P. M. Jasmine, P. Abdulla, P. M. Raphika
A novel coupling enhancement technique of waveguide fed hemispherical dielectric resonator antenna (DRA) is presented in this paper. A capacitive waveguide junction using two steps is placed between the rectangular waveguide and the slotted ground plane, DRA is placed above the ground plane. Single, dual and wide band operation of the proposed technique is illustrated. Very good coupling is obtained with the double step junction coupled waveguide fed DRA. Broadside radiation patterns with very low levels of cross polarization are obtained.
提出了一种新型波导馈电半球形介质谐振器天线的耦合增强技术。在矩形波导和开槽接地面之间放置一个两级电容波导结,DRA放置在接地面之上。说明了该技术的单频段、双频段和宽带运行。双阶结耦合波导馈电DRA获得了很好的耦合效果。得到了极低水平交叉极化的宽侧辐射图。
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引用次数: 1
Design and Simulation of a Micro Hotplate Using COMSOL Multiphysics for MEMS Based Gas Sensor 基于COMSOL Multiphysics的微热板MEMS气体传感器设计与仿真
S. Joy, Jobin K. Antony
Micro Hotplate (MHP) is one of the main components in micro-sensors, especially in gas sensors. A MHP should have low power consumption, low thermal mass and better temperature uniformity. The metal oxide gas sensors utilize the properties of surface adsorption to detect changes in resistance as a function of varying concentration of different gases. In order to detect to detect the resistive changes, the temperature must be in the requisite temperature range over the heater area. The sensitivity and response time of the sensor are dependent on the operating temperature of the MHP. Making proper design is of critical importance. In this paper, the geometric optimization of the heater structure to achieve high temperature uniformity by performing analysis using COMSOL Multiphysics 5.0, a Finite Element Analysis (FEA) package is done. Electro-Thermo-Mechanical(ETM) analysis is done to review the temperature and stress distribution over the MHP. Two dimensional structure of five different patterns of MHP, namely single Meander, double Meander, fan shape, rectangle shape, and porous structure are designed and simulations are done. Their temperature profiles are compared and porous structure is found to have low power consumption and better temperature uniformity. Three dimensional design and simulation of Meander and porous structures are also done and their temperature and displacement profiles are compared. The effect of various materials and thickness of heating element on the temperature, displacement, and power consumption of the MHP is evaluated. The porous structure is found to be best suitable for designing a gas sensor with high sensitivity and low power consumption. Then a gas sensor with high sensitivity is designed using this porous structure of MHP and ETM simulation is done.
微热板(MHP)是微传感器尤其是气体传感器的主要部件之一。MHP应具有低功耗、低热质量和较好的温度均匀性。金属氧化物气体传感器利用表面吸附的特性来检测电阻的变化,作为不同气体浓度变化的函数。为了检测到电阻的变化,温度必须在加热器区域的必要温度范围内。传感器的灵敏度和响应时间取决于MHP的工作温度。适当的设计是至关重要的。本文采用有限元分析软件COMSOL Multiphysics 5.0对加热器结构进行几何优化,以达到高温均匀性。通过电-热-机械(ETM)分析,考察了MHP上的温度和应力分布。设计了单曲、双曲、扇形、矩形和多孔五种不同结构的MHP二维结构,并进行了仿真。比较了它们的温度分布,发现多孔结构具有低功耗和较好的温度均匀性。对弯曲结构和多孔结构进行了三维设计和仿真,并对其温度和位移曲线进行了比较。评估了不同材料和加热元件厚度对MHP的温度、位移和功耗的影响。发现多孔结构最适合设计高灵敏度、低功耗的气体传感器。然后利用该多孔结构设计了高灵敏度的气体传感器,并进行了ETM仿真。
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引用次数: 14
A Self-Tuning Hybrid Fuzzy-PID Controller for First Order Hydraulic Systems 一阶液压系统的自整定模糊- pid混合控制器
J. Jithish, K. S. Arun Nath, D. Sivan, Biju C. Oommen
A Self-Learning Hybrid Fuzzy-PID Controller is developed for pressure control in a first order hydraulic tank system. The system is closed loop wherein a hybrid Fuzzy-PID controller prescribes the duty cycle of a PWM generator which controls an ON-OFF valve connected to a hydraulic tank. The hydraulic tank is modeled as a first order system. Appropriate fuzzy rules and membership functions are developed for inputs such that the self-organizing Fuzzy-PID controller readjusts the initial tuning parameters Kp, Ki and Kd during system operation, with respect to the reference signal eliminating the need to manually readjust the Proportional, Integral and Derivative gains (Kp, Ki, Kd) for each control signal. Modeling and initial analysis have been done in MATLAB-Simulink which shows excellent characteristics compared to classical PID Control.
针对一阶液压油箱系统的压力控制问题,提出了一种自学习模糊pid混合控制器。该系统是闭环的,其中混合模糊pid控制器规定PWM发生器的占空比,该发生器控制连接到液压油箱的开关阀。将液压油箱建模为一阶系统。为输入开发了适当的模糊规则和隶属函数,使自组织模糊pid控制器在系统运行期间根据参考信号重新调整初始调谐参数Kp, Ki和Kd,从而消除了为每个控制信号手动重新调整比例,积分和导数增益(Kp, Ki, Kd)的需要。在MATLAB-Simulink中进行了建模和初步分析,与传统的PID控制相比,显示出优异的特性。
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引用次数: 1
A Linear Like Methodology for Source Allocation and Biasing Design of Non-linear Devices in Analog Circuits 模拟电路中非线性器件源分配和偏置设计的类线性方法
R. Krishnan, S. K. Kumar
The essential and often difficult step in the design of an analog circuit is 'biasing design'. The difficulty arises because traditional methods provides no separation between linear and non-linear components and hence a number of time consuming iterations may be required to get the 'operating points' fixed at the desired points in the load line. A methodology that completely removes the non-linearity of biasing design in analog circuit is presented. This method allows the designer to select the desired operating points for the non-linear components and start working on the remaining part of the circuit by avoiding the biasing iterations. Fixator-norator pair plays the key role in this method. Fixator keeps the design parameters fixed at the design whereas the pairing norator works as the placeholder for power conducting components or dc sources. Concept of hybrid equivalent circuit has also been presented and four examples have been worked out for better understanding of the methodology.
在模拟电路的设计中,最基本也是最困难的一步是“偏置设计”。困难的出现是因为传统方法没有提供线性和非线性组件之间的分离,因此可能需要许多耗时的迭代才能将“工作点”固定在负载线上的期望点上。提出了一种完全消除模拟电路偏置设计非线性的方法。这种方法允许设计人员为非线性元件选择所需的工作点,并通过避免偏置迭代开始对电路的其余部分进行工作。Fixator-norator对在该方法中起着关键作用。固定器保持设计参数在设计时固定,而配对调节器作为电源传导元件或直流电源的占位符。本文还提出了混合等效电路的概念,并举例说明了该方法。
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引用次数: 4
AutoScaling of VM in Private And Public Cloud Environment with Debt Assessment 私有云和公共云环境中虚拟机的自动扩展与债务评估
S. Santhosh, A. Binu
Cloud computing is an enchanting technology for the allocation of resources on-demand. The cloud Systems mostly hinges upon Virtualization techniques for the resource allocation purposes. All the Cloud Services that service providers put forward are chargeable and are charging the users depending on demand. So its important for them to improve the scalability factor to provide a superlative service to the users. As a solution, recently the providers began to use an auto scaling mechanism which can scale the resources according to the need of them. Auto Scaling mechanism on Virtual machines will impart a streamlined use of cloud resources. It is considered as an effective Resource management technique that utilize data center in structured manner although, the already existing scaling methods just take into account CPU utilization only. Hence it is needed to consider an Auto Scaling method that guarantees the execution of applications within the deadline. So here we concentrate on an auto scaling method that handles Bag-of-Tasks jobs in Private and Public cloud environment. The results of Simulation shows how effectively the resources are allocated considering the deadline as parameter.
云计算是一种按需分配资源的迷人技术。云系统主要依靠虚拟化技术来实现资源分配。服务提供商提供的所有云服务都是收费的,并根据需求向用户收费。因此,提高可扩展性系数,为用户提供一流的服务对他们来说非常重要。作为一种解决方案,最近提供商开始使用一种自动扩展机制,可以根据需要扩展资源。虚拟机上的自动伸缩机制将使云资源的使用更加流畅。它被认为是一种有效的资源管理技术,以结构化的方式利用数据中心,尽管现有的扩展方法只考虑CPU利用率。因此,需要考虑一种自动缩放方法,以保证在截止日期内执行应用程序。因此,在这里,我们专注于一种自动缩放方法,该方法可以处理私有云和公共云环境中的任务袋作业。仿真结果表明,以最后期限为参数,资源分配是有效的。
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引用次数: 1
Low Illumination Image Enhancement Algorithm Using Iterative Recursive Filter and Visual Gamma Transformation Function 基于迭代递归滤波和视觉伽马变换函数的低照度图像增强算法
D. David
In this paper, a Retinex based enhancement algorithm is proposed for enhancing low illumination images. The novelty of algorithm lies in the use of Iterative Recursive filter for image decomposition and Visual Gamma transformation function for pixel mapping. The edge preserving Iterative Recursive Filter estimates the base layer efficiently and 2D Visual Gamma transformation function map the pixels based on Human Vision System (HVS). The proposed Visual gamma function mimics the local and global adoption capability of HVS. The experimental results show that algorithm produce naturally looking and artifact free enhanced images with improved visibility in local regions. The subjective and objective assessment on publicly available dataset illustrates the effectiveness of the proposed method comparing with other enhancement algorithms.
本文提出了一种基于Retinex的低照度图像增强算法。该算法的新颖之处在于使用迭代递归滤波器进行图像分解,使用视觉伽玛变换函数进行像素映射。基于人类视觉系统(HVS)的二维视觉伽玛变换函数对像素进行映射。所提出的Visual gamma函数模拟了HVS的局部和全局采用能力。实验结果表明,该算法生成的增强图像外观自然,无伪影,局部可见性提高。通过对公开数据集的主观和客观评价,验证了该方法与其他增强算法的有效性。
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引用次数: 5
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
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
A Novel Anomaly Detection Algorithm for WSN 一种新的WSN异常检测算法
A. Balakrishnan, P. Rino
Wireless sensor networks (WSNs) are gaining more and more interest in the research community due to their unique characteristics and have a lots of interesting applications. Besides energy consumption security of WSN is being a critical issue nowadays. This is because WSNs are easily effected by various types of attacks and node compromises so they require security mechanisms to defend against them. An intrusion detection system (IDS) is one such solution to the problem. There are many research works focused in the area of signature based anomaly based IDS. Based on these malicious activities there is a need of addressing a new or modified versions of IDS algorithm. The proposed algorithm, abbreviated as AD(anomaly detection) algorithm has dedicated procedures for secure cluster formation, periodic re-clustering, and efficient cluster member monitoring and then the detection of different attacks. The performance of AD algorithm in identifying and detecting intrusions using a rule-based anomaly detection scheme is studied via simulations.
无线传感器网络(WSNs)由于其独特的特性和许多有趣的应用而越来越受到研究界的关注。此外,无线传感器网络的能耗安全问题也成为当今社会的一个重要问题。这是因为wsn很容易受到各种类型的攻击和节点妥协的影响,因此它们需要安全机制来防御它们。入侵检测系统(IDS)就是解决这个问题的一种方法。在基于特征的异常入侵检测领域有很多研究工作。基于这些恶意活动,需要解决IDS算法的新版本或修改版本。本文提出的算法,简称AD(异常检测)算法,具有安全的集群形成、周期性的重新聚类、高效的集群成员监控和检测不同攻击的专用程序。通过仿真研究了基于规则的异常检测方案中AD算法识别和检测入侵的性能。
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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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