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2014 11th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)最新文献

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Polyfluorene-based light-emitting diodes using TiOx as an electron injection layer 采用TiOx作为电子注入层的聚芴基发光二极管
Mónica Vuelvas Trinidad, L. Reséndiz-Mendoza, V. Cabrera-Arenas, M. Estrada
We have fabricated polyfluorene-based polymer light emitting diodes (PLEDs), in which a sol-gel TiOx layer introduced between the polymer and an eutectic alloy Woods metal cathode to increase device performance, maintaining low temperature and low cost fabrication process. The emission of the PFO/TiOx PLEDs showed a red shift of 11nm with respect to the PLEDs without TiOx.
我们制造了聚芴基聚合物发光二极管(PLEDs),在聚合物和共晶合金Woods金属阴极之间引入了溶胶-凝胶TiOx层,以提高器件性能,保持低温和低成本的制造工艺。与不含TiOx的led相比,PFO/TiOx led的发射红移幅度为11nm。
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引用次数: 0
Similarity of sentences through comparison of syntactic trees with pairs of similar words 通过比较语法树和相似词对来确定句子的相似性
Karla Duran, José Rodríguez, Maricela Claudia Bravo
The comparison of sentences has several applications and they can be addressed by different approaches. One of them is to compare a pair of sentences through analysis of syntactic trees. In this work we present a method to evaluate the similarity between a pair of sentences, through the comparison of syntactic trees. The method makes an exploration of branches of trees trying to find similar nodes between them, giving a degree of similarity by each comparison. The method is designed to take into account the type of each node and, the number of them on each tree and the nodes to match on trees compared, i.e. this proposal considers all of nodes and not only if one tree is contained into another tree.
句子的比较有几种应用,可以通过不同的方法来解决。其中一种方法是通过分析句法树来比较一对句子。在这项工作中,我们提出了一种通过句法树的比较来评估一对句子之间相似性的方法。该方法对树的分支进行探索,试图找到它们之间的相似节点,并通过每次比较给出一个相似度。该方法的设计考虑了每个节点的类型、每棵树上节点的数量以及在树上比较匹配的节点,即该方案考虑了所有节点,而不仅仅是一个树包含在另一个树中。
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引用次数: 6
Necessary exponential stability conditions for scalar periodic time-delay systems 标量周期时滞系统的必要指数稳定性条件
M. A. Gómez, S. Mondié, G. Ochoa-Ruiz
In this paper necessary conditions for exponential stability for scalar periodic systems with one delay are presented. They are obtained in the framework of Lyapunov-Krasovskii functionals of complete type and depends exclusively on the Lyapunov delay function of the delay system.
本文给出了单时滞标量周期系统指数稳定的必要条件。它们是在完备型Lyapunov- krasovskii泛函的框架下得到的,并且完全依赖于延迟系统的Lyapunov延迟函数。
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引用次数: 0
Comparing two methods of object detection in autonomous vehicle 自动驾驶汽车中两种目标检测方法的比较
D. Rosas-Miranda, V. Ponomaryov, A. Palacios-Enriquez
Autonomous obstacle avoidance in mobile robots has been an active field in image processing and control theory. In this paper, we propose and evaluate two methods for multiple objects detection for a mobile robot in outdoor. The first method uses a block matching algorithm to obtain a disparity map and SURF features detector. The second method uses a semi-global stereo vision environment. Both methods are tested during detecting pedestrian, boxes and cones using a video sequence in validation of a robot.
移动机器人的自主避障一直是图像处理和控制理论研究的热点。本文提出并评价了户外移动机器人多目标检测的两种方法。第一种方法使用块匹配算法获得视差图和SURF特征检测器。第二种方法采用半全局立体视觉环境。这两种方法都在检测行人、箱子和锥体的过程中进行了测试,使用视频序列来验证机器人。
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引用次数: 1
Robust higher order sliding mode based impedance control for dual-user teleoperation under unknown constant time delay 基于鲁棒高阶滑模的未知恒时延双用户遥操作阻抗控制
Hugo Santacruz-Reyes, L. García-Valdovinos, Hugo Jiménez-Hernández, Alan G. López-Segovia, O. Dominguez-Ramirez
This paper presents a dual-user teleoperation scheme to perform a collaborative task using n-DOF nonlinear manipulators as masters and slave. It consists on impedance controllers for the manipulators in order to achieve a desired dynamic behavior depending on the user's necessities. Moreover, to cope with the uncertainty in the slave, a sliding mode controller is introduced and a desired impedance model for the salve is chosen as the sliding surface. Since the slave teleoperator is in contact with a rigid environment, the slave controller requires a free of chattering control strategy, which makes first order sliding mode teleoperation control unsuitable. Then a higher order sliding mode based impedance controller is proposed to guarantee robust impedance tracking under constant, but unknown time delay. Therefore, a position scaling factor is incorporated to deal with the different workspaces among masters and slave. The validity of the proposed control scheme is demonstrated via simulations performed on a 3-DOF dual-user teleoperation system. The simulation setup includes a Phantom Premium 1.0, a Phantom Omni, a Catalyst-5 and communication channels which suffer from constant unknown time delays.
本文提出了一种双用户远程操作方案,以n-DOF非线性机械臂为主从机,执行协同任务。它由机械手的阻抗控制器组成,以便根据用户的需要实现所需的动态行为。此外,为了应对从机的不确定性,引入了滑模控制器,并选择了从机所需的阻抗模型作为滑模面。由于从端遥操作器与刚性环境接触,从端控制器需要无抖振控制策略,这使得一阶滑模遥操作控制不适合。然后提出了一种基于高阶滑模的阻抗控制器,以保证在恒定但未知的时间延迟下的鲁棒阻抗跟踪。因此,引入位置缩放因子来处理主从空间的不同。通过对三自由度双用户遥操作系统的仿真,验证了所提控制方案的有效性。模拟设置包括一个Phantom Premium 1.0,一个Phantom Omni,一个Catalyst-5和一个持续未知时间延迟的通信通道。
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引用次数: 2
Analysis of P300 containing EEG through three non-linear methods 用三种非线性方法分析P300含脑电信号
Jennifer Ladd-Parada, C. Alvarado-Serrano, J. M. Gutiérrez-Salgado
Along the electroencephalography signal one may identify several frequency intervals as well as negative and positive potentials which are related to conscience states (e.g. awake and asleep) and to neuronal processes such as the response to a variety of stimuli and their interpretation. The P300 is among the latter. The fact that these potentials are the result of the sum of several neurons activation, which are in turn shaped by cognitive processes, makes the EEG signal a good candidate for three types of non-linear analysis: DFA, sample entropy and phase synchronization. All 3 methods showed a higher information production rate and hemisphere synchronization for EEG segments containing P300, when applied to the recordings of 2 subjects from a BCI database. The most significant one was a γ=0.83 for the electrode pair PO3-PO4. Given that the differences between both studied patterns (visual ERP with and without P300), the measures obtained in this paper may be used as viable characteristics for the identification of such patterns.
沿着脑电图信号,人们可以识别出几个频率间隔以及与意识状态(如清醒和睡眠)和神经元过程(如对各种刺激的反应及其解释)有关的负电位和正电位。P300属于后者。事实上,这些电位是几个神经元激活的总和,而这些神经元又由认知过程形成,这使得脑电图信号成为三种非线性分析的良好候选:DFA、样本熵和相位同步。3种方法对脑机接口数据库中2个被试的记录均显示出较高的信息产生率和半球同步性。电极对PO3-PO4的γ值为0.83。考虑到两种研究模式(有P300和没有P300的视觉ERP)之间的差异,本文获得的测量方法可以作为识别这些模式的可行特征。
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引用次数: 0
Fault detection and isolation problem: Sliding mode fuzzy observers and neural networks 故障检测与隔离问题:滑模模糊观测器与神经网络
J. Anzurez-Marín, E. Espinosa-Juárez, B. Castillo-Toledo
In this paper results of the application of a hybrid Fault Detection and Isolation scheme are presented. A Takagi-Sugeno fuzzy model is used to describe the system and a type of sliding mode observers are designed to estimate the system state vector; from this, the diagnostic signal-residual is generated by the comparison of measured and estimated output. Neural Networks are proposed in order to solve the fault isolation problem based on signal-residual. The faulted component is identified from the active signal-residuals by means of the application of the presented technique based on neural networks. This paper shows an application of the fault diagnosis technique, which was satisfactorily tested in a two-tank hydraulic system.
本文给出了一种混合故障检测和隔离方案的应用结果。采用Takagi-Sugeno模糊模型对系统进行描述,设计一种滑模观测器对系统状态向量进行估计;在此基础上,通过测量输出和估计输出的比较,产生诊断信号残差。为了解决基于信号残差的故障隔离问题,提出了神经网络。将该方法应用于基于神经网络的有源信号残差中进行故障分量的识别。本文介绍了故障诊断技术在双油箱液压系统中的应用,并取得了满意的结果。
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引用次数: 0
Cloud service recommender system using clustering 采用集群的云服务推荐系统
T. Zain, M. Aslam, Imran Mujaddid Rabbani, A. Enríquez
The prevalence of cloud computing has resulted in an increased number of services developed for the Web. Selecting an appropriate cloud service from amongst a lot of commonly featured available services has become very difficult particularly for non-IT users i.e. it is cumbersome for users to select a cloud service that is best suited to their requirements. Quality of service (QOS) is considered as one of the main criterion in the selection process. This paper focuses on cloud service selection method allowing users to specify their perception of quality criteria. Our approach is based on the data mining technique clustering which is an unsupervised learning technique. Developed algorithm classifies the cloud services into different number of groups based on selected quality attributes and ranks them accordingly. The research aims to assist every type of users for choosing a cloud service without engaging into any financial contract. In order to validate our approach of best service selection, we test our system with cloud vendors like Google, Microsoft, and Amazon.
云计算的流行导致了为Web开发的服务数量的增加。从许多常见的可用服务中选择合适的云服务已经变得非常困难,特别是对于非it用户而言,即用户选择最适合其需求的云服务非常麻烦。服务质量(QOS)被认为是选择过程中的主要标准之一。本文的重点是云服务的选择方法,允许用户指定他们的感知质量标准。我们的方法是基于数据挖掘技术聚类,这是一种无监督学习技术。开发的算法根据选择的质量属性将云服务分类为不同数量的组,并进行相应的排序。该研究旨在帮助各种类型的用户在不参与任何金融合同的情况下选择云服务。为了验证我们的最佳服务选择方法,我们使用像Google、Microsoft和Amazon这样的云供应商来测试我们的系统。
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引用次数: 15
Manufacture of Ag, Cr and Cu-doped ZnO pellets for gas sensor applications 用于气体传感器的Ag、Cr和cu掺杂ZnO球团的制造
M. R. Herrera-Rivera, A. Maldonado-Alvarez, M. D. L. L. Olvera-Amador
Starting from a mixture of zinc acetate and potassium hydroxide, zinc oxide (ZnO) powders were prepared by the homogenous precipitation method. The powders were calcined at 800°C for 2h, and subsequently milled in a planetary ball milling during 8 h at a constant speed of 400 rpm. The crystalline phase was determined from X-Ray diffraction (XRD). The morphology of the particles was analyzed by using Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). From XRD results the wurtzite structure of ZnO was corroborated. SEM images showed a homogenous distribution of the particle size, whereas from TEM analysis the particle size was determined with a higher precision. From the milled and calcined powders, a mixture of ZnO powders with alumina (Al2O3) was developed at different weight ratios for manufacturing 1 mm thick pellets. After measuring the sensing properties of undoped pellets, the [ZnO]/[Al2O3] ratio presenting the maximum sensitivity was taken as reference, and then, doped by impregnation pellets were manufactured to analyze the dopant effect. Three different dopants were used, namely, Cu, Ag, and Cr. The sensing properties of the pellets were tested in an atmosphere of propane, 500 ppm, and different operation temperatures, 200 and 300°C.
以醋酸锌和氢氧化钾为原料,采用均相沉淀法制备氧化锌粉体。粉末在800℃下煅烧2h,随后在行星球磨机中以400转/分的恒速研磨8h。用x射线衍射(XRD)测定了结晶物相。采用透射电镜(TEM)和扫描电镜(SEM)对颗粒形貌进行了分析。XRD结果证实了ZnO的纤锌矿结构。SEM图像显示颗粒尺寸分布均匀,TEM分析显示颗粒尺寸具有较高的精度。从粉碎和煅烧的粉末中,开发了不同重量比的ZnO粉末与氧化铝(Al2O3)的混合物,用于制造1mm厚的球团。在测定了未掺杂球团的传感性能后,以灵敏度最大的[ZnO]/[Al2O3]比值为基准,制备了浸渍球团,分析了掺杂效果。采用三种不同的掺杂剂,即Cu、Ag和Cr。在丙烷气氛(500 ppm)和不同操作温度(200和300℃)下测试了球团的传感性能。
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引用次数: 2
Proposal of a mechanism for an electrical elbow prosthesis 一种电动肘关节假体的设计方案
Diana Alejandra Contreras Alejo, A. Ramírez-García, F. Funes, I. Bazán
This work focuses on the description of the system of mechanism for a electrical prosthesis. Considering system performance and system of transmission, both will allow to make the movements of the electrical prosthesis. The electrical prosthesis was designed to replace the function of the elbow joint of an upper limb. In the system of transmission is based on rotary motion since it is similar to the movements of the elbow joint which is flexion and extension, to carry out these movements were determined using the gears; of which were calculated to produce them, it is described in this work. On the other hand, the system performance was chosen by using the electrical actuators for high efficiency, high availability and variety of sizes. To be able to define our system of mechanism of a electrical prosthesis, it should be considered several criteria listed in this work, and finally the torque output was calculated to know how much weight can load the prosthesis designed.
本文主要对电义肢的机构系统进行了描述。考虑到系统性能和传输系统,两者都将允许电子假体的运动。电子假体被设计用来代替上肢肘关节的功能。在传动系统中是基于旋转运动的,因为它的运动类似于肘关节的弯曲和伸展,来执行这些运动都是用齿轮确定的;其中的计算产生了它们,这是在这个工作中描述的。另一方面,采用电动执行器对系统的性能进行了选择,要求系统效率高、可用性好、尺寸多样。为了能够定义我们的电动假肢的机构系统,需要考虑本工作中列出的几个标准,最后计算扭矩输出,以知道所设计的假肢可以承载多少重量。
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引用次数: 2
期刊
2014 11th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)
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