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High Performance Channel Decoders on CELL Broadband Engine for WiMAX System 基于CELL宽带引擎的WiMAX系统高性能信道解码器
Q4 Engineering Pub Date : 2011-01-19 DOI: 10.1234/MJEE.V5I1.377
Chen Xiang, Zhao Ming, Zhao Juntao, C. Jianwen, Wang Jing
Wireless baseband processing, which is characterized by high computational complexity and high data throughput, is regarded as the most challenging issue for software radio (SR) systems, especially for the General Purpose Processor (GPP)-based SR systems. To overcome this implementation difficulty in SR systems, the multicore architecture has been proposed as the GPP-based SR platform, for example, multicore Central Processing Unit (CPU), Graphic Processing Unit (GPU) and Cell processors. In this paper, the Cell processor is considered as the core component in the GPP-based SR platform, and the channel decoding modules for convolutional, Turbo and Low-density parity-check (LDPC) codes of WiMAX systems are investigated and efficiently implemented on Cell processor. With a single Synergistic Processor Element (SPE) running at 3.2GHz, the implemented channel decoders can throughput up to 30Mbps, 1.36Mbps and 1.71Mbps for the above three codes, respectively. Moreover, the decoding modules can be easily integrated to the SR system and can provide a highly integrated SR solution.
无线基带处理具有高计算复杂度和高数据吞吐量的特点,是软件无线电(SR)系统,特别是基于通用处理器(GPP)的SR系统中最具挑战性的问题。为了克服这种在SR系统中的实现困难,多核架构被提出作为基于gpp的SR平台,例如多核中央处理器(CPU)、图形处理器(GPU)和Cell处理器。本文将Cell处理器作为基于gpp的SR平台的核心组件,研究了WiMAX系统中卷积码、Turbo码和低密度校验码的信道解码模块,并在Cell处理器上进行了高效实现。使用运行在3.2GHz的单个协同处理器元件(SPE),实现的信道解码器可以分别为上述三种代码提供高达30Mbps、1.36Mbps和1.71Mbps的吞吐量。此外,解码模块可以很容易地集成到SR系统中,可以提供高度集成的SR解决方案。
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引用次数: 1
Image Coding for Robotic Guidance Using Neuroblastoma Cultures 神经母细胞瘤培养物用于机器人导航的图像编码
Q4 Engineering Pub Date : 2011-01-12 DOI: 10.1234/MJEE.V5I1.380
J. M. Ferrández, Victor Lorente, J. Garrigós, Eduardo Fernández
The main objective of this work is to analyze the computing capabilities of human neuroblastoma cultured cells and to define stimulation patterns able to modulate the neural activity in response to an image for controlling an autonomous robot. Multielectrode Arrays Setups have been designed for direct culturing neural cells over silicon or glass substrates, providing the capability to stimulate and record simultaneously populations of neural cells. If we are able to modify the selective responses of some cells with an external pattern stimuli over different time scales, the neuroblastoma-cultured structure could be trained to process image sequences.
这项工作的主要目的是分析人类神经母细胞瘤培养细胞的计算能力,并定义能够调节神经活动的刺激模式,以响应图像来控制自主机器人。多电极阵列装置设计用于在硅或玻璃衬底上直接培养神经细胞,提供同时刺激和记录神经细胞种群的能力。如果我们能够在不同的时间尺度上改变一些细胞对外部模式刺激的选择性反应,那么神经母细胞瘤培养的结构就可以被训练来处理图像序列。
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引用次数: 1
Application of Partial-Connected Dynamic and GA-Optimized Neural Networks to Misuse Detection Using Categorized and Ranked Input Features 部分连通动态ga优化神经网络在输入特征分类排序误用检测中的应用
Q4 Engineering Pub Date : 2011-01-01 DOI: 10.1234/MJEE.V5I1.350
M. Sheikhan, Z. Jadidi, A. Farrokhi
The number of attacks in computer networks has grown extensively, and many new intrusive methods have appeared. Intrusion detection is known as an effective method to secure the information and communication systems. In this paper, the performance of Elman and partial-connected dynamic neural network (PCDNN) architectures are investigated for misuse detection in computer networks. To select the most significant features, logistic regression is also used to rank the input features of mentioned neural networks (NNs) based on the Chi-square values for different selected subsets in this work. In addition, genetic algorithm (GA) is used as an optimization search scheme to determine the sub-optimal architecture of investigated NNs with selected input features. International knowledge discovery and data mining group (KDD) dataset is used for training and test of the mentioned models in this study. The features of KDD data are categorized as basic, content, time-based traffic, and host-based traffic features. Empirical results show that PCDNN with selected input features and categorized input connections offers better detection rate (DR) among the investigated models. The mentioned NN also performs better in terms of cost per example (CPE) when compared to other proposed models in this study. False alarm rate (FAR) of the PCDNN with selected input features and categorized input connections is better than other proposed models, as well. Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4
计算机网络攻击的数量急剧增加,出现了许多新的入侵手段。入侵检测是保护信息通信系统安全的一种有效手段。本文研究了Elman和部分连通动态神经网络(PCDNN)结构在计算机网络误用检测中的性能。为了选择最显著的特征,在这项工作中,还使用逻辑回归根据不同选择子集的卡方值对提到的神经网络(nn)的输入特征进行排序。此外,采用遗传算法(GA)作为优化搜索方案来确定所研究的具有选定输入特征的神经网络的次优结构。本研究使用国际知识发现和数据挖掘组(KDD)数据集对上述模型进行训练和测试。KDD数据的特征分为基础特征、内容特征、基于时间的流量特征和基于主机的流量特征。实验结果表明,选择输入特征和分类输入连接的PCDNN在所研究的模型中具有更好的检测率(DR)。与本研究中提出的其他模型相比,上述NN在每例成本(CPE)方面也表现更好。选择输入特征和分类输入连接的PCDNN的虚警率(FAR)也优于其他提出的模型。正常0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4
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引用次数: 0
COMPARISON OF ANFIS BASED SSSC, STATCOM AND UPFC CONTROLLERS FOR TRANSIENT STABILITY IMPROVEMENT 基于anfis的sssc、statcom和upfc控制器的暂态稳定性改进比较
Q4 Engineering Pub Date : 2010-12-17 DOI: 10.1234/MJEE.V4I4.422
A. Shishebori, F. Taki, S. Abazari, G. Markadeh
This paper presents the comparative performance of neuro- Fuzzy controlled Voltage Source Converters (VSC) based Flexible AC Transmission System (FACTS) devices, such as Static Synchronous Series Compensator (SSSC), Static Synchronous Compensator (STATCOM), and Unified Power Flow Controller (UPFC) in terms of improvement in transient stability. In neuro-fuzzy control method the simplicity of fuzzy systems and the ability of training in neural networks have been combined. The training data set the parameters of membership functions in fuzzy controller. This Adaptive Network Fuzzy Inference System (ANFIS) can track the given input-output data in order to conform to the desired controller. The maximization of energy function of UPFC is used as an objective function to generate the training data. Proposed method is tested on a single machine infinitive bus system to confirm its performance through simulation. The results prove the noticeable influence of ANFIS controlled UPFC on increasing Critical Clearing Time (CCT) of system.
本文介绍了基于神经模糊控制电压源变换器(VSC)的柔性交流输电系统(FACTS)器件,如静态同步串联补偿器(SSSC)、静态同步补偿器(STATCOM)和统一潮流控制器(UPFC)在改善暂态稳定性方面的性能。神经模糊控制方法将模糊系统的简单性与神经网络的训练能力相结合。训练数据设置模糊控制器的隶属函数参数。该自适应网络模糊推理系统(ANFIS)可以跟踪给定的输入输出数据,以符合期望的控制器。以UPFC能量函数的最大化为目标函数生成训练数据。在单机不定式总线系统上进行了仿真试验,验证了该方法的性能。结果表明,ANFIS控制的UPFC对提高系统的临界清除时间(CCT)有显著的影响。
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引用次数: 7
Forecasting PMLSM Direct Thrust Control Based on Neural Network by Considering Motors Dynamic Behavior and Speed Effects 考虑电机动态特性和速度效应的神经网络预测永磁同步电机直接推力控制
Q4 Engineering Pub Date : 2010-11-26 DOI: 10.1234/MJEE.V4I4.300
Shahgholian Ghazanfar, A. D. Zadeh
The direct force thrust control (DTFC) is linear type of the direct torque control (DTC) method. The advantages of DTFC method are structure simplicity, low dependency to motor parameters and no requirement to coordination transformations. In this paper this method is modified in order to eliminate the defects that include the switching frequency and exciting large ripples of force and flux. In previous works, the structure simplicity of DTC, rare calculations to reduce the force ripples and fixing switching frequency are disaffirmed. With regards to keeping DTC advantages, a new method is presented in this paper to eliminate the defects by the aid of neural network. Also, the precise non-linear behavior of PMLSM motor in DTC has been considered by using space vector modulation. Finally, the simulation results concluded by the submitted intelligent DTC-SVM method are more satisfactory than other methods.
直接力推力控制(DTFC)是直接转矩控制(DTC)方法的线性型。DTFC方法具有结构简单、对电机参数依赖性低、不需要进行协调变换等优点。本文对该方法进行了改进,以消除开关频率和激励力通量波动大的缺陷。在以往的研究中,对直接转矩控制的结构简单性、减少力波动的计算和固定开关频率的方法进行了否定。为了保持直接转矩控制的优点,本文提出了一种利用神经网络消除缺陷的新方法。采用空间矢量调制的方法,研究了永磁同步电机在直接转矩控制中的精确非线性特性。最后,所提交的智能DTC-SVM方法的仿真结果比其他方法更令人满意。
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引用次数: 1
Calculation of Cogging Force in Permanent Magnet Linear Motor Using Analytical and Finite Element Methods 用解析法和有限元法计算永磁直线电机齿槽力
Q4 Engineering Pub Date : 2010-11-26 DOI: 10.1234/MJEE.V4I4.310
M. Zare, M. Marzband
In a permanent magnet (PM) linear motor, there is a force ripple which is detrimental to positioning. This force ripple is mainly due to a cogging force and a mutual force ripple. These forces are affected by the geometric parameters of a brushless PM motor, such as the width of the magnet, the height of the magnet, the shifted length of the magnetic pole, the length and height of the armature and the slot width. The optimal design can be found by considering force ripple as a cost function and the geometric parameters as design variables. In this paper, we calculate the flux density distribution in the air gap using the analytic solution of Laplace and Possion equations in the function of geometric parameters. The cogging force is obtained by integrating the Maxwell stress tensor, which is described by the flux density distribution on the slot face and end face of the iron core of an armature. Finally, a finite element method is presented in order to compare with the previous method.
在永磁直线电机中,存在不利于定位的力脉动。这种力波动主要是由于齿槽力和相互力波动造成的。这些力受无刷永磁电机几何参数的影响,如磁体的宽度、磁体的高度、磁极的位移长度、电枢的长度和高度以及槽宽。以力脉动为代价函数,以几何参数为设计变量,进行优化设计。本文利用Laplace方程和Possion方程的解析解,以几何参数为函数,计算了气隙内的磁通密度分布。齿槽力由电枢铁芯槽面和端面的磁通密度分布对麦克斯韦应力张量进行积分得到。最后,提出了一种有限元方法,与以往的方法进行了比较。
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引用次数: 5
Intrusion Detection Based on Rule Extraction from Dynamic Cell Structure Neural Networks 基于动态细胞结构神经网络规则提取的入侵检测
Q4 Engineering Pub Date : 2010-11-12 DOI: 10.1234/MJEE.V4I4.107
M. Sheikhan, A. Khalili
Knowledge embedded within artificial neural networks (ANNs) is distributed over the connections and weights of neurons. So, the user considers ANN as a black box system. There are many researches investigating the area of rule extraction by ANNs. In this paper, a dynamic cell structure (DCS) neural network and a modified version of LERX algorithm are used for rule extraction. On the other hand, intrusion detection system (IDS) is known as a critical technology to secure computer networks. So, the proposed algorithm is used to develop IDS and classify the patterns of intrusion. To compare the performance of the proposed system with other machine learning algorithms, multi-layer perceptron (MLP) with output weight optimization-hidden weight optimization (OWO-HWO) training algorithm is employed with selected inputs based on the results of a feature relevance analysis. Empirical results show the superior performance of the IDS based on rule extraction from DCS, in recognizing hard-detectable attack categories, e.g. userto-root (U2R) and also offering competitive false alarm rate (FAR). Although, MLP with 25 selected input features, instead of 41 standard features introduced by knowledge discovery and data mining group (KDD), performs better in terms of detection rate (DR) and cost per example (CPE) when compared with some other machine learning methods, as well.
人工神经网络中嵌入的知识分布在神经元的连接和权重上。因此,用户认为人工神经网络是一个黑盒系统。基于人工神经网络的规则抽取领域有很多研究。本文采用动态细胞结构(DCS)神经网络和改进的LERX算法进行规则提取。另一方面,入侵检测系统(IDS)是保证计算机网络安全的关键技术。因此,该算法被用于开发入侵检测系统和对入侵模式进行分类。为了与其他机器学习算法进行性能比较,采用基于特征相关性分析结果的输入选择,采用具有输出权值优化-隐藏权值优化(owo - hho)训练算法的多层感知器(MLP)。经验结果表明,基于DCS规则提取的IDS在识别难以检测的攻击类别(例如用户到根(U2R))以及提供竞争性虚警率(FAR)方面具有优异的性能。尽管如此,与其他一些机器学习方法相比,具有25个选择输入特征的MLP在检测率(DR)和每例成本(CPE)方面表现更好,而不是由知识发现和数据挖掘组(KDD)引入的41个标准特征。
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引用次数: 8
EMOTION RECOGNITION AND EMOTION SPOTTING IMPROVEMENT USING FORMANT-RELATED FEATURES 情绪识别和情绪识别改进使用共振体相关特征
Q4 Engineering Pub Date : 2010-09-22 DOI: 10.1234/MJEE.V4I4.266
D. Gharavian, M. Sheikhan
Emotion has an important role in naturalness of man-machine communication. So, computerized emotion recognition from speech is investigated by many researchers in the recent decades. In this paper, the effect of formant-related features on improving the performance of emotion detection systems is experimented. To do this, various forms and combinations of the first three formants are concatenated to a popular feature vector and Gaussian mixture models are used as classifiers. Experimental results show average recognition rate of 69% in four emotional states and noticeable performance improvement by adding only one formant-related parameter to feature vector. The architecture of hybrid emotion recognition/spotting is also proposed based on the developed models.
情感在人机交流的自然度中起着重要的作用。因此,近几十年来,许多研究人员对语音的计算机化情感识别进行了研究。本文研究了共振峰相关特征对提高情绪检测系统性能的影响。为此,将前三个共振峰的各种形式和组合连接到一个流行的特征向量上,并使用高斯混合模型作为分类器。实验结果表明,在四种情绪状态下,平均识别率为69%,仅在特征向量中加入一个共振峰相关参数,性能有明显提高。在此基础上,提出了混合情感识别/识别的体系结构。
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引用次数: 6
Integration of Morphology and Graph-based Techniques for Fully Automatic Liver Segmentation 基于形态学和图的全自动肝脏分割技术的集成
Q4 Engineering Pub Date : 2010-08-27 DOI: 10.1234/MJEE.V4I3.322
W. Yussof, H. Burkhardt
Here a fully 3D algorithm for automatic liver segmentation from CT volumetric datasets is presented. The algorithm starts by smoothing the original volume using anisotropic diffusion. The coarse liver region is obtained from the threshold process that is based on a priori knowledge. Then, several morphological operations is performed such as operating the liver to detach the unwanted region connected to the liver and finding the largest component using the connected component labeling (CCL) algorithm. At this stage, both 3D and 2D CCL is done subsequently. However, in 2D CCL, the adjacent slices are also affected from current slice changes. Finally, the boundary of the liver is refined using graph-cuts solver. Our algorithm does not require any user interaction or training datasets to be used. The algorithm has been evaluated on 10 CT scans of the liver and the results are encouraging to poor quality of images.
本文提出了一种基于CT体积数据集的全三维肝脏自动分割算法。该算法首先使用各向异性扩散平滑原始体积。粗肝区域由基于先验知识的阈值处理获得。然后,对肝脏进行形态学操作,去除与肝脏相连的无用区域,并使用连接分量标记(CCL)算法寻找最大分量。在此阶段,3D和2D CCL随后完成。然而,在二维CCL中,相邻的切片也会受到当前切片变化的影响。最后,利用图切求解器对肝脏的边界进行了细化。我们的算法不需要使用任何用户交互或训练数据集。该算法已在10个肝脏CT扫描上进行了评估,结果令人鼓舞,但图像质量较差。
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引用次数: 9
AN OVERVIEW OF SINGLE PHASE TELECOMMUNICATION CONVERTER TOPOLOGIES: A COMPARATIVE STUDY 单相电信变换器拓扑综述:比较研究
Q4 Engineering Pub Date : 2010-08-05 DOI: 10.1234/MJEE.V4I3.253
Gulam Amer, S. S. Rao
This paper describes the development of a new generation of single phase rectifier which is used to power telecommunications equipment. A rectifier is designed in such a manner to meets with all the requirements of the telecommunications industry. A number of common single phase topologies exist that could be realized as telecommunication power supplies, however, they do not completely satisfy all the industry requirements. This paper reviews recent progress in topology, control and design aspects in single phase PFC techniques. Different switching rectifier topologies are presented for various applications. Merits and limitations of these techniques are discussed. A detailed report of an investigation in the power converter system performance is also provided.
本文介绍了用于通信设备供电的新一代单相整流器的研制。整流器是这样设计的,以满足电信行业的所有要求。存在许多可以实现为电信电源的常见单相拓扑,但是,它们不能完全满足所有的行业需求。本文综述了单相PFC技术在拓扑、控制和设计方面的最新进展。针对不同的应用,提出了不同的开关整流器拓扑结构。讨论了这些技术的优点和局限性。本文还提供了对功率变换器系统性能的详细调查报告。
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引用次数: 2
期刊
Majlesi Journal of Electrical Engineering
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