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A Review: Detection of Premature VentricularContraction Beat of ECG 室性早搏的心电图检测综述
G. Kanwar, N. Dewangan, Kiran Dewangan
ECG signal is a periodic signal that gives information about the heart activity. A lot of information about normal and abnormality about the heart can be obtained from the ECG signal. Premature ventricular contractions (PVCs) are the ectopic beats that occur from the ventricular area of the heart. It is a most common heart arrhythmia that found on a human being. Detection of Premature Ventricular Contraction (PVCs) beat from the Electrocardiogram (ECG) is the most important thing in the field of biomedical.
心电信号是一种提供心脏活动信息的周期性信号。从心电信号中可以获得大量关于心脏正常和异常的信息。室性早搏是发生在心脏心室区域的异位搏动。这是在人类身上发现的最常见的心律失常。从心电图(ECG)中检测室性早搏(早搏)是生物医学领域最重要的工作。
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引用次数: 2
A Review: Bilateral Filter for Real TimeImage De-noising 双侧滤波器在实时图像去噪中的研究进展
P. Patil, A. Kumbhar
Bilateral filtering has gained a high awareness level in medical image processing and non-destructive testing. Bilateral filtering method is that it allows for considering both the spatial locality and neighbouring points with similar amplitudes at the same time which make it can better preserving the image edges and textures than the conventional linear filtering algorithms. This paper illustrates the survey of Adaptive Bilateral Filter (ABF), Local Tone Mapping(TM), and Lazy Sliding Window for SIMD Architectures, Histogram-Based Bilateral Filtering (BF), FPGA Vision and SNRP Network Protocol, Pulse Coupled Neural Network (PCNN). In this paper a spatially adaptive bilateral filtering image de-noising algorithm with low computational complexity is proposed.
双边滤波在医学图像处理和无损检测中已经得到了高度重视。双边滤波方法允许同时考虑空间局域性和具有相似幅度的相邻点,这使得它比传统的线性滤波算法能更好地保留图像的边缘和纹理。本文阐述了SIMD体系结构的自适应双边滤波(ABF)、局部色调映射(TM)和延迟滑动窗口、基于直方图的双边滤波(BF)、FPGA视觉和SNRP网络协议、脉冲耦合神经网络(PCNN)的研究概况。本文提出了一种低计算复杂度的空间自适应双边滤波图像去噪算法。
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引用次数: 1
Design of Novel Fly-Back Converter Using PID Controller 基于PID控制器的新型反激变换器设计
Subhrajyoti Modak, G. Panda, P. Saha, Sankar Das
Fly-back converters have been widely used because of the irrelative simplicity and their excellent performance for multi output applications. They can save cost and volume compared with the other converters, especially in moderate low power applications..In a fly-back converter, a transformer is adopted to achieve galvanic isolation and energy storage. Modelling is done without parasitic as well as with parasitic components. A detailed analysis, simulation and different control strategy are conferred for Fly-back converter. To verify the design and modelling at primary stage, study of the converter in for input AC voltage220V at 50Hz and output DC voltage of 440V and 150W output power rating. Simulation result shows a little ripple in output of the converter in open loop. Finally in order to evaluate the system as well as response of the controller, Fly-back converter simulated using MATLAB.
反激变换器由于其相对简单和在多输出应用中具有优异的性能而得到了广泛的应用。与其他变换器相比,它们可以节省成本和体积,特别是在中等低功率应用中。在反激变换器中,采用变压器来实现电流隔离和能量存储。建模是在没有寄生组件和寄生组件的情况下完成的。对反激变换器进行了详细的分析、仿真和不同的控制策略。为了验证设计和建模的正确性,研究了该变换器在输入交流电压为220v,输出直流电压为440V,额定输出功率为150W的情况下。仿真结果表明,该变换器在开环时输出纹波较小。最后,为了评估系统以及控制器的响应,利用MATLAB对反激变换器进行了仿真。
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引用次数: 6
Survey on FPGA Based Space Vector PWMMotion Control 基于FPGA的空间矢量PWMMotion控制综述
K. Rekha, Shalini Vashishtha
The Space vector Pulse Width Modulation (SVPWM) is possibly one of the best techniques among all the PWM techniques for variable voltage variable frequency drives. This is a direct digital technique and space vector concept is utilized to calculate the duty cycles of inverter switching devices. Rapid growth in VLSI technology and EDA techniques has given way for the development of complex and compact controllers for industrial control systems. Specific hardware technologies such as FPGAs based architecture platforms provide rapid prototyping, high performance signal processing and flexibility for implementation of drive, motion and activation control of drives. This paper reviews some of the FPGA based SVPWM motor control systems available in the literature.
空间矢量脉宽调制(SVPWM)可能是所有变压变频驱动PWM技术中最好的技术之一。这是一种直接的数字技术,利用空间矢量概念计算逆变器开关器件的占空比。VLSI技术和EDA技术的快速发展为工业控制系统的复杂和紧凑控制器的发展让路。特定的硬件技术,如基于fpga的架构平台,提供快速原型设计,高性能信号处理和灵活性,实现驱动器,运动和激活控制。本文综述了文献中一些基于FPGA的SVPWM电机控制系统。
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引用次数: 3
Power System Severity Analysis underGenerator Outage Condition 发电机停运情况下电力系统严重性分析
Savithri Ravindra, V. Reddy, S. Sivanagaraju
Now a day because of the continuous increase in power demand on a power system increases the importance of the power system severity analysis for secured operation. The contingency in a power system may be because of the outage of transmission lines or the generators. Out of which, generator outage condition is the most critical one. In this paper, the power system severity is analyzed under generator outage condition. The most sensitive generator(s) in a given system is identified using generator shift factors. The complete methodology of the proposed methodology to analyze the power system severity in terms of transmission line loadings and bus voltage magnitudes is analyzed on standard IEEE-14 bus test system with supporting numerical and graphical results.
如今,由于电力需求的不断增加,电力系统的严重性分析对于安全运行的重要性日益增加。电力系统中的意外事故可能是由于输电线路或发电机的中断。其中,发电机停运工况是最关键的工况。本文分析了发电机停运情况下电力系统的严重程度。在给定的系统中,最敏感的发电机是用发电机移位因子来确定的。在标准的IEEE-14母线测试系统上分析了基于输电线路负载和母线电压值的电力系统严重程度分析方法的完整方法,并提供了支持的数值和图形结果。
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引用次数: 5
Stochastic Method for Non-HomogeneousCycles Identification in Quasi-Periodic Signals 拟周期信号非齐次周期辨识的随机方法
D. T. Guzmán, C. Carbajal
Quasi-periodic signals can be contaminated with random distortions (“artifacts”) not manifested periodically and homogenously,without affecting all signal cycles.These distortions cannot be characterized statistically or modelled with a known probability function. In this paper, a stochastic analysis method to detect the presence of such distortions is proposed. The aim of the method is identifying the affected cycles, which exhibit a different morphology compared to the unaffected cycles.The identification of the affected cycles (or non-homogeneous cycles) allows to estimate parameters and extract the useful information needed for a correct characterization of the signal.The method compares nearly periodic signal cycles through the mean square error and the estimated variance of the inherent noise affecting the signal. Expressions are derived to estimate this error and compared with experimental results.
准周期信号可能会受到随机畸变(“伪影”)的污染,而不是周期性和均匀地表现出来,而不会影响所有信号周期。这些扭曲不能用统计特征或已知的概率函数来建模。本文提出了一种随机分析方法来检测这种失真的存在。该方法的目的是识别受影响的周期,与未受影响的周期相比,它们表现出不同的形态。受影响周期(或非均匀周期)的识别允许估计参数并提取正确表征信号所需的有用信息。该方法通过影响信号的固有噪声的均方误差和估计方差来比较近周期信号周期。推导了误差估计表达式,并与实验结果进行了比较。
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引用次数: 1
Soldier Tracking, Identification and AidingSystem 士兵跟踪、识别和辅助系统
M. Salavati, A. Ebrahimi, M. Rezaee, H. Rasouli
Identification tags ( dog tags) for soldiers appear to be one of the most under-studied and neglected areas of research. In battles the only identifying object is a metal identification tag that has the information about the soldier worn it. To find and identify those killed, the entire war zone have to be searched to find dead bodies or these identification tags. This task is not only time-consuming but also costly and needs a lot of manpower to search the area. In this paper an electronic device is designed and implemented to replace identification tags and to help finding killed or injured soldiers as soon as possible during the war or after it. A light, power efficient and robust positioning module that provides a high accuracy in all environments is needed to find soldier position. Although GPS has weaknesses but it can provide sufficient accuracy while meeting the above requirements. RF transmission is used to send data to operation center. And a low consuming 32 bit ARM microcontroller is used for circuit timing and data processing as well as keeping soldier basic and medical information. The battery life of this device is important. All the electrical equipment used in this device is low power consuming and with the written algorithm the device can work for months.
士兵身份识别标签(狗牌)似乎是研究最不充分和被忽视的研究领域之一。在战斗中,唯一的识别对象是一个金属识别标签,上面有士兵佩戴的信息。为了寻找和识别死者,必须搜索整个战区,找到尸体或这些识别标签。这项任务不仅耗时,而且耗资巨大,需要大量人力进行搜索。本文设计并实现了一种电子设备,以取代识别标签,并帮助在战争期间或战后尽快找到伤亡士兵。需要一种轻便、节能、坚固的定位模块,在所有环境下都能提供高精度的定位,以找到士兵的位置。GPS虽然有缺点,但在满足上述要求的同时,也能提供足够的精度。采用射频传输方式将数据发送到操作中心。采用低功耗的32位ARM单片机进行电路定时和数据处理,并保存士兵基本信息和医疗信息。这个设备的电池寿命很重要。该设备中使用的所有电气设备都是低功耗的,并且使用书面算法,该设备可以工作数月。
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引用次数: 0
A Survey on Patch Antenna BandwidthEnhancement through Feed Techniques andNovel Proximity Slot Coupling Approach 基于馈电技术和新型接近缝隙耦合方法的贴片天线带宽增强研究
S. Singh, Abhinav Bhargav
Many applications of micro strip antenna are constricted by their innate narrow bandwidth. In this paper a survey on the different feeding technique, which are micro strip line feed, coaxial plane feed, proximity coupled feed and aperture couple feed, for wireless micro strip antenna is done. Micro strip line and coaxial probe feeds are contacting scheme, in which RF power directly to the radiating patch. Proximity and Aperture coupled feeds are non contacting schemes, in which electromagnetic field coupling is done to transfer power between the micro strip line and the radiating patch. In this paper, a new approach is projected to design inset feed micro strip antenna with slots in it to develop the antenna bandwidth. The input impedance matching method for antenna is predominantly vital for a feed technique. The design of slotted micro strip antenna on a substrate of thickness 11mm that give wideband features is based on embedding an inset look analogous proximity L shape feed to improve bandwidth. The Method of Moments (MOM) base IE3D software with the method of moment (MOM) ensemble has been used to in the circular patch performance comparison for the improvement of the impedance bandwidth and the power radiated with slots on the same physical dimensions.
微带天线固有的窄带带宽限制了其许多应用。本文综述了无线微带天线的馈电技术,即微带线馈电、同轴平面馈电、接近耦合馈电和孔径耦合馈电。微带线与同轴探头馈电采用接触方案,其中射频功率直接向辐射贴片输送。邻近馈电和孔径耦合馈电均为非接触式馈电方案,通过电磁场耦合在微带线和辐射贴片之间传递功率。本文提出了一种设计插入式馈电微带天线的新方法,并提出了一种带槽的微带天线,以提高天线的带宽。天线输入阻抗匹配方法在馈电技术中起着至关重要的作用。在厚度为11mm的基板上设计了一种具有宽带特性的开槽微带天线,该天线是基于嵌入一个类似于接近L形馈电的插入式馈电来提高带宽的。利用基于IE3D软件的矩量法(MOM)和矩量集成法(MOM)对圆形贴片的性能进行了比较,以提高相同物理尺寸上的槽的阻抗带宽和辐射功率。
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引用次数: 1
Survey on Image Reconstruction TechniquesUsing Multi-Focus Images 基于多焦点图像的图像重建技术综述
R. Patil, Sneha P. Jatkar
Image reconstruction using multi-focus images is very novel approach used in many applications. The different methods of image reconstruction by using multiple differently focused images on FPGA are described in detail in this paper. The effective method for FPGA implementation can be determined from this survey. From the comparison of survey papers the method of spatial frequency analysis based on three dimensional FFT is expensive. So the efficient method of image reconstruction can be designed with the help of dimension reduction and two dimensional FFT which is better in cost and quality. The Block-RAMs on FPGA limits the image size. So the problem of sizing of images is overcome by FPGA-based image reconstruction system by using an onboard DDR SDRAM. So the image reconstruction system based on Xilinx FPGA can be efficiently designed.
利用多焦点图像进行图像重建是一种非常新颖的方法,在许多应用中都得到了应用。本文详细介绍了在FPGA上利用多幅不同聚焦图像进行图像重建的不同方法。通过这次调查,可以确定FPGA实现的有效方法。从文献比较来看,基于三维FFT的空间频率分析方法是昂贵的。因此,利用降维和二维FFT可以设计出成本和质量都较好的高效图像重建方法。FPGA上的block - ram限制了图像的大小。基于fpga的图像重建系统利用板载DDR SDRAM克服了图像大小的问题。因此,基于赛灵思FPGA的图像重建系统可以有效地进行设计。
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引用次数: 0
Suppression of Random Valued Impulse Noise in Image Processing: A Review 图像处理中随机脉冲噪声的抑制研究进展
Varsha Pardeshi, R. Patil
Nowadays a good low complexity denoising technique is necessary as pre-processing operation in many real-time practical applications. Images get corrupted with impulse noise due to the process of image transmission and image acquisition. In the process of impulse noise filtering it is necessary to preserve edges and details of the image. Also to avoid image smoothing, only corrupted pixel must be filtered. Comprehensive survey of various denoising techniques has been focused in this paper. This paper illustrates the survey of different low complexity methods such as Median, Adaptive Center Weighted Median (ACWM), Adaptive Median Filter (AMF) and high complexity methods such as Alpha-trimmed Mean Based Method (ATMBM), Differential Rank Impulse Detector (DRID) and Rank Ordered Relative Difference (RORD).The most effective technique to remove random valued impulse noise without losing useful information with pleasing denoised image is by decision-tree based impulse detector and direction oriented edge preserving image filter. This design requires low computational cost, few memory buffers, no iterations and most suited to be applied to many real-time applications. Also this design can be efficiently designed with FPGA.
目前,在许多实时实际应用中,需要一种好的低复杂度去噪技术作为预处理操作。图像在传输和采集过程中会受到脉冲噪声的破坏。在脉冲噪声滤波过程中,需要保留图像的边缘和细节。同样为了避免图像平滑,只有损坏的像素必须过滤。本文对各种去噪技术进行了全面的综述。本文综述了不同的低复杂度方法,如中值法、自适应中心加权中值法(ACWM)、自适应中值滤波法(AMF)和高复杂度方法,如基于alpha -trim均值法(ATMBM)、差分秩脉冲检测器(DRID)和秩有序相对差分法(RORD)。基于决策树的脉冲检测器和有方向的保边图像滤波器是去除随机值脉冲噪声而不损失有用信息的最有效方法。这种设计计算成本低,内存缓冲区少,不需要迭代,最适合应用于许多实时应用。同时,该设计可以高效地利用FPGA进行设计。
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引用次数: 2
期刊
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy
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