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2009 IEEE International Conference on Computational Intelligence for Measurement Systems and Applications最新文献

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Aerial image clustering using genetic algorithm 基于遗传算法的航空图像聚类
Yan-He Chen, Ya-Wei Ho, Chih-Hung Wu, Chih-Chin Lai
Interpretation of aerial images is an important task in various military and non-military applications. Image segmentation can be viewed as the essential step of extracting features in aerial images. Among many developed segmentation methods, the clustering methods have been extensively investigated and used. The determination of the number of clusters in a dataset is inherently a difficult problem, especially when the a priori information on the dataset is unavailable. In this paper, we propose a genetic algorithm-based clustering approach for aerial image segmentation. Our approach has two advantages: it can automatically determine the proper number of clusters and cluster the data according to the cluster validity index. The performance of the proposed approach is evaluated in conjunction with two cluster validity indices, namely Davies-Bouldin index and Xie-Beni index, respectively. Experimental results are provided to illustrate the feasibility of the proposed approach.
航空图像解译是各种军事和非军事应用中的一项重要任务。图像分割是航空图像提取特征的重要步骤。在众多的分割方法中,聚类方法得到了广泛的研究和应用。确定数据集中的簇数本质上是一个难题,特别是当数据集中的先验信息不可用时。本文提出了一种基于遗传算法的航空图像聚类分割方法。该方法具有两个优点:一是可以自动确定适当的聚类数量,二是可以根据聚类有效性指标对数据进行聚类。结合Davies-Bouldin指数和Xie-Beni指数两个聚类效度指标对该方法的性能进行了评价。实验结果表明了该方法的可行性。
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引用次数: 7
A high precision VLSI loser-take-all circuit for neural networks and fuzzy systems 用于神经网络和模糊系统的高精度VLSI输家通吃电路
Mustafijur Rahman, K. L. Baishnab, F. Talukdar
The design and simulation of a novel CMOS voltage mode LTA (Loser-take-all) circuit is described. The circuit employs additional inhibitory and local excitatory feedback based on a common voltage computation and this improves both speed and precision drastically. As a result, a single stage cell provides better resolution in comparison to previous works where cascading of multiple stages is necessary to improve resolution. This makes the circuit suitable for systems where silicon area and power consumption are constraints. Moreover, the feedback arrangement ensures a single loser. Simulations in Cadence show that a single cell can resolve voltage differences as small as 0.5 mV in around 50ns with 1 pF load capacitance. Detailed simulation results along with appropriate mathematical relations have been provided. This circuit is a fundamental building block in the competitive layer of self organizing neural networks, non linear filters, fuzzy and neuromorphic systems.
介绍了一种新型CMOS电压模式LTA电路的设计与仿真。该电路采用了基于共同电压计算的额外抑制和局部兴奋反馈,这大大提高了速度和精度。因此,与以前需要多级级联以提高分辨率的工作相比,单级单元提供了更好的分辨率。这使得电路适用于硅面积和功耗受限的系统。此外,反馈安排确保了只有一个输家。Cadence的模拟表明,单个电池可以在1 pF负载电容的情况下,在大约50ns的时间内解决小至0.5 mV的电压差异。给出了详细的仿真结果和相应的数学关系。该电路是自组织神经网络、非线性滤波器、模糊和神经形态系统竞争层的基本组成部分。
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引用次数: 2
A hysteretic current controller for active power filter with constant frequency 恒频有源电力滤波器的滞后电流控制器
Wenjin Dai, Baofu Wang, Hua Yang
In accordance with the advantage of conventional hysteretic current control method, this paper advances a novel control method for active power filter (APF). In conventional hysteretic current control, the hysteretic band (HB) is fixed and actual compensating current is limited in a fixed hysteretic band. When the voltage source inverter (VSI) works in high-frequency state, as the switching frequency changes the problems such as increasing switching losses and audible noise will appear. In response to this problem, the constant frequency hysteretic current control method based on variable hysteretic band is advanced in this paper. Firstly, the connection between hysteretic band and switching frequency must be found correctly. Then, the variable hysteretic band current controller is designed according to the connection. Finally, the Matlab simulation results show that the switching frequency of VSI is held nearly constant and the proposed controller can track reference current well. The problems of increasing switching losses and audible noise which happened in high-frequency state can be resolved in conventional hysteretic current control.
针对传统滞回电流控制方法的优点,提出了一种新的有源电力滤波器控制方法。在传统的滞回电流控制中,滞回带是固定的,实际补偿电流被限制在一个固定的滞回带内。当电压源逆变器(VSI)工作在高频状态时,随着开关频率的变化,会出现开关损耗增大和可听噪声等问题。针对这一问题,本文提出了基于变滞回带的恒频滞流控制方法。首先,必须正确地找到滞回带与开关频率之间的关系。然后,根据连接设计了可变迟滞带电流控制器。最后,Matlab仿真结果表明,该控制器几乎保持了VSI的开关频率不变,并能很好地跟踪参考电流。传统的迟滞电流控制可以解决高频状态下开关损耗增大和可听噪声的问题。
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引用次数: 11
Cell adherence and growth on a fabricated superhydrophobic surface 细胞在制备的超疏水表面上的粘附和生长
D. Kim, M. Park, J. Park, W. Hwang
Superhydrophobic surfaces have been studied extensively for their valuable properties. We fabricated a superhydrophobic surface using a replica anodic aluminum oxide (AAO) template, and grew 3T3-Swiss albino cells on it and on an aluminum, polytetrafluoroethylene (PTFE) surface and a fabricated surface with a superhydrophobic property. As a result by comparison with an aluminum surface and PTFE surface, which exhibited fouling within 3 days, a superhydrophobic surface exhibited high resistance to fouling. It was very difficult for cells to remain and grow on the superhydropbobic surface. There appears to be a correlation between the nature of the superhydrophobic property and the adhesion of the cells. There appears to be a correlation between the nature of the nanoscale roughness in the creation of a superhydrophobic surface.
超疏水表面因其宝贵的性质而受到广泛的研究。我们利用复制的阳极氧化铝(AAO)模板制备了一个超疏水表面,并在其上、铝、聚四氟乙烯(PTFE)表面和具有超疏水性能的制备表面上生长3t3 -瑞士白化细胞。结果表明,与铝表面和聚四氟乙烯表面相比,超疏水表面在3天内就会发生结垢,具有较高的抗结垢能力。细胞很难在超疏水表面存活和生长。在超疏水性的性质和细胞的粘附性之间似乎有一种相关性。在超疏水表面的形成过程中,纳米级粗糙度的性质之间似乎存在关联。
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引用次数: 0
A PLL control based on algorithm of BP neural network 基于BP神经网络算法的锁相环控制
Wenjin Dai, Youhui Xie, Hua Yang
For the parallel operation of the electric power network, it needs to control the current to be the same phase with the electric power network voltage. This paper presents a control method of the phase tracking based on the artificial neural network. It takes the algorithm of BP network into Phase Locked Loop (PLL) and the electric network voltage as the expected output and current as the training sample. Then with the self-learning of neural network, it can gradually reduce the output error between the sample and the expected target and achieve the synchronization and tracking of the expected output. In this paper, it has been carried out through the digital dynamic simulation with the MATLAB Simulation Power System Toolbox. Its result shows it can track its target well and have a strong adaptive capacity.
为了使电网并联运行,需要控制电流与电网电压同相。提出了一种基于人工神经网络的相位跟踪控制方法。该算法将BP网络算法转化为锁相环(PLL),以网络电压作为期望输出,电流作为训练样本。然后通过神经网络的自学习,逐渐减小样本与预期目标之间的输出误差,实现对预期输出的同步和跟踪。本文利用MATLAB仿真电源系统工具箱对其进行了数字动态仿真。结果表明,该方法能很好地跟踪目标,具有较强的自适应能力。
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引用次数: 3
Characterization and design of 3D scaffolds for biofluidic criteria 生物流体标准三维支架的表征和设计
Qing Li, Jiani Yu, M. Schellekens, Shiwei Zhou, Wei Li, S. Armfield, R. Appleyard
The success of tissue regeneration to a certain extent lies on the mechanical and biological environments that the scaffold provides. The former has been addressed in terms of stiffness and strength in a range of tissue engineering scenarios. The latter is often related to fluid flow capacity of facilitating nutrient delivery, waste removal, and more importantly promoting tissue remodeling. This paper aims at developing a computational fluid dynamics (CFD) analysis for scaffold characterization and design in terms of fluidic wall shear stress. A certain level of wall shear stress (WSS) is considered essential to stimulate the cell differentiation and tissue growth, thereby making load-bearing neotissue more functional. This paper will firstly examine the transporting performance of scaffold topology that was designed based upon the stiffness criterion. Then a WSS based topological design is developed by using bidirectional evolutionary structural optimization (BESO) method, where a more uniform and favorable WSS distribution can be obtained.
组织再生的成功在一定程度上取决于支架所提供的机械环境和生物环境。前者已经在一系列组织工程场景的刚度和强度方面得到了解决。后者通常与促进营养物质输送,废物清除,更重要的是促进组织重塑的流体流动能力有关。本文旨在建立一种基于流体壁剪切应力的计算流体动力学(CFD)分析方法,用于支架的表征和设计。一定水平的壁剪切应力(WSS)被认为是刺激细胞分化和组织生长所必需的,从而使承载的新组织更有功能。本文首先对基于刚度准则设计的支架拓扑结构的运输性能进行了研究。然后,采用双向进化结构优化(BESO)方法,提出了一种基于WSS的拓扑设计方法,使WSS分布更加均匀和有利。
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引用次数: 0
Nonlinear static decoupling of six-dimension force sensor for walker dynamometer system based on artificial neural network 基于人工神经网络的步行测功机系统六维力传感器非线性静态解耦
Dong Ming, Xi Zhang, Xiuyun Liu, B. Wan, Yong Hu, K. Luk
The static coupling of six-dimension force sensor for walker dynamometer system is a key factor to limit its measuring precision. A new decoupling method based on artificial neural network is proposed in this paper. Relevant error check results shows that, after the calibration by using the Back Propagation neural network and Radial Basis Function neural networks, the maximal system precision error with single-direction force was 7.78% and 4.33% and the maximal crosstalk was 7.49% and 6.52%,respectively. In comparison with traditional linear calibration method, the proposed technique can effectively increase the measurement accuracy of walker loads and greatly decrease the coupling effect.
步行者测功机系统中六维力传感器的静态耦合是限制其测量精度的关键因素。提出了一种新的基于人工神经网络的解耦方法。误差校验结果表明,采用反向传播神经网络和径向基函数神经网络标定后,系统在单向力作用下的最大精度误差分别为7.78%和4.33%,最大串扰分别为7.49%和6.52%。与传统的线性校准方法相比,该方法可以有效地提高行走载荷的测量精度,并大大降低耦合效应。
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引用次数: 5
Decentralized UAV formation tracking flight control using gyroscopic force 基于陀螺力的分散无人机编队跟踪飞行控制
Haibo Min, F. Sun, Feng Niu
We consider the problem of formation flight for a set of Unmanned Air Vehicles (UAV) in a possible obstacle laden environment. A novel decentralized control design procedure is developed which guarantees collision and obstacle avoidance. The control design is based on a modified virtual leader-follower structure and a simple consensus protocol. Vehicle collision and obstacle avoidance is ensured by comprehensively utilizing artificial potential function and the gyroscopic force approach. By introducing gyroscopic force, a smoother formation trajectory is obtained which makes the UAV maneuver behavior more reasonable and it also tackles the local minimal problem caused by artificial potential function method. Numerical simulations are provided to demonstrate the correctness of the algorithm.
研究了一组无人机在可能存在障碍物的环境下的编队飞行问题。提出了一种新的分散控制设计方法,保证了碰撞和避障。控制设计基于一个改进的虚拟领导-追随者结构和一个简单的共识协议。综合利用人工势函数和陀螺力方法,保证了车辆的避碰避障。通过引入陀螺力,得到更平滑的编队轨迹,使无人机的机动行为更加合理,解决了人工势函数法引起的局部极小问题。通过数值仿真验证了算法的正确性。
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引用次数: 35
Comparison on prediction wood moisture content using ARIMA and improved neural networks ARIMA与改进神经网络预测木材含水率的比较
Cao Jun, Zhang Jiawei, Sun Liping
Wood moisture content (MC) is one of the key parameters which influenced on wood product cost, qualities and efficiency, etc. The fiber saturation point (FSP) cannot be measured directly based the principle of electrical method. In this paper, two prediction measuring algorithms based the autoregressive integrated moving average (ARIMA) and functional link artificial neural network models are considered along with various combinations of these models for predicting wood moisture content (MC) around the fiber saturation point. The predicting principle and procedure of these methods are presented in detail. Measurement experiments are performed to get the time series data of wood moisture content. Simulation comparison of predicting performances shows that the improved neural network models with functional link ANN give a better performance in solving the wood moisture content prediction problem.
木材含水率(MC)是影响木材产品成本、质量和效率等的关键参数之一。基于电法原理,光纤饱和点(FSP)不能直接测量。本文考虑了基于自回归积分移动平均(ARIMA)和功能链接人工神经网络模型的两种预测测量算法,以及这些模型的各种组合来预测纤维饱和点附近的木材含水率(MC)。详细介绍了这些方法的预测原理和步骤。通过测量实验,得到木材含水率的时间序列数据。预测性能的仿真比较表明,采用功能链接人工神经网络的改进神经网络模型在解决木材含水率预测问题上具有更好的性能。
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引用次数: 4
Video image super-resolution restoration based on iterative back-projection algorithm 基于迭代反投影算法的视频图像超分辨率恢复
B. Wan, Lin Meng, Dong Ming, Hongzhi Qi, Yong Hu, K. Luk
Image fusion was one of the most important technology of pattern recognition. This paper proposed a fast superresolution image reconstruction algorithm basing on image sequences. Iterative back-projection (IBP) technique was used to construct high resolution from image sequences. roughly registered basing on feature and then use Registration algorithm basing on Gray to optimize the result. Iterative back-projection technique was used to construct high resolution from image sequences. Experimental results show that this algorithm solve the problem that the translation and rotation is small in traditional method. The details, definition and resolution of high resolution image processed with the proposed method are effectively improved.
图像融合是模式识别的重要技术之一。提出了一种基于图像序列的快速超分辨率图像重建算法。采用迭代反投影(IBP)技术从图像序列中构建高分辨率图像。基于特征进行粗配准,然后使用基于灰度的配准算法对结果进行优化。采用迭代反投影技术从图像序列中构造高分辨率图像。实验结果表明,该算法解决了传统方法平移和旋转量小的问题。该方法有效地改善了高分辨率图像的细节、清晰度和分辨率。
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引用次数: 15
期刊
2009 IEEE International Conference on Computational Intelligence for Measurement Systems and Applications
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