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2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)最新文献

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Modeling and Simulation of Flexible Tethered Satellite System 柔性系留卫星系统建模与仿真
Najmeh Keshtkar, Manuel Sanjurjo Rivo, A. Poznyak, S. Keshtkar
This paper presents the dynamic equations of a flexible tethered satellite system in a circular orbit. The tether is modelled as a combination of point masses connected with massless rods. Through this model the flexibility and distributed mass of tether are considered. The results of the numerical experiments show the effectiveness of the proposed model for analysing the longitudinal and transverse oscillations of the system.
本文给出了圆形轨道上柔性系留卫星系统的动力学方程。该缆绳被建模为点质量与无质量杆连接的组合。该模型考虑了锚索的柔度和分布质量。数值实验结果表明,该模型对分析系统的纵向和横向振动是有效的。
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引用次数: 1
Position-Velocity Categorization of Time-Frequency Coherence for the Analysis of Muscle Coordination Dynamics of Elbow Joint During Low Force Movements in Healthy Children 健康儿童低力运动中肘关节肌肉协调动力学的时频相干位置-速度分类分析
A. Pérez-Sanpablo, E. R. Avila, Alicia Meneses Peñaloza, C. Disselhorst-Klug, S. Becker, J. Zannatha, J. Gutiérrez-Martínez
In this study we used a method based on joint position and velocity categorization of time frequency coherence calculated using the pseudo smoothed Wigner-Ville distribution (PSWVD). PSWVD is applied to one experimental data set of sEMG signals during voluntary isotonic elbow movements in healthy children. Nine healthy children (age range 6-13 years old) were assessed. Time-frequency coherence of each muscle were divided into ten joint angle categories (0°-130°) and five joint angular velocity categories (0°/s to 1097°/s) based on elbow kinematic data. Effects of load configurations, elbow position, elbow velocity and muscle pairs were analyzed by ANOVA tests. Findings suggest the existence of a common muscle coordination dynamics between antagonistic muscles of elbow joint which may be helpful to understand neuromusculoskeletal deficits and to evaluate and to design interventions for neuromusculoskeletal diseases.
本文采用了一种基于位置和速度联合分类的时频相干度计算方法,该方法采用伪平滑Wigner-Ville分布(PSWVD)计算。将PSWVD应用于健康儿童自愿等张肘运动时的肌电信号实验数据集。对9名健康儿童(6-13岁)进行了评估。基于肘关节运动数据,将每块肌肉的时频相干性划分为10个关节角度类别(0°~ 130°)和5个关节角速度类别(0°/s ~ 1097°/s)。通过方差分析分析负荷配置、肘部位置、肘部速度和肌肉对的影响。研究结果提示肘关节拮抗肌肉之间存在共同的肌肉协调动力学,这可能有助于理解神经肌肉骨骼缺陷,并有助于评估和设计神经肌肉骨骼疾病的干预措施。
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引用次数: 2
Feature selection for stress level classification into a physiologycal signals set 特征选择将应力水平分类为生理信号集
Marco A. Jimenez-Limas, C. A. Ramirez-Fuentes, B. Tovar-Corona, Laura Ivoone Garay Jiménez
This paper describes the methodology and results obtained when classifying two states of stress, low and high using a data base from Physionet that contains the recordings of physiological signals under several stress conditions. The signals were first denoised and then, features were extracted for segments of 5 minutes. Four out of 6 signals were chosen: heart rate variability, respiration, galvanic skin response from the hand, and galvanic skin response from the foot. Two non-lineal features were extracted: approximate entropy and correlation dimension, both with m=2 and m=3. Besides, three linear features were extracted: energy, mean and standard deviation. Five machine learning classifiers were compared: K-nearest neighbours, Support vector machines with a linear kernel, support vector machines with a Gaussian kernel, Naïve Bayes classifier, Random forest classifier and logistic regression. It was found that approximate entropy and correlation dimension with m=3 provide the greater differences between the two stress states. It was also found that choosing only three physiological signals and correlation dimension with m=3 the logistic regression classifier achieved and accuracy of 81.38%, the best performance compared to other combinations of signals and classifiers. The three physiological signals that provided the best features were heart rate variability, respiration and galvanic skin response on the foot.
本文描述了使用Physionet数据库(包含几种应激条件下的生理信号记录)对低和高两种应激状态进行分类的方法和结果。首先对信号去噪,然后对5分钟的片段进行特征提取。从6个信号中选择了4个:心率变异性、呼吸、手部皮肤电反应和足部皮肤电反应。提取两个非线性特征:近似熵和相关维数,均为m=2和m=3。此外,提取了三个线性特征:能量、均值和标准差。比较了五种机器学习分类器:k近邻、线性核支持向量机、高斯核支持向量机、Naïve贝叶斯分类器、随机森林分类器和逻辑回归。发现近似熵和m=3的相关维数提供了两种应力状态之间较大的差异。我们还发现,仅选择3个生理信号,且相关维数m=3时,逻辑回归分类器的准确率达到81.38%,是其他信号与分类器组合的最佳选择。提供最佳特征的三个生理信号是心率变异性、呼吸和足部皮肤电反应。
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引用次数: 8
Fabrication and characterization of a PVDF/PLA membrane made by electrospinning as a flexible temperature sensor 静电纺丝制PVDF/PLA柔性温度传感器膜的制备与表征
G. Rodríguez-Roldán, E. Suaste-Gómez, Héctor Reyes-Cruz
In this work, a temperature characterization of a PVDF/PLA membrane made by electrospinning technique is presented. Electrospinning is a versatile method to generate fibers made of a variety of materials such as ceramics or polymers that can reach the nanometric range. Polyvinylidene difluoride (PVDF) is a piezoelectric smart polymer which is often combined with other materials in order to improve or modify its properties. This work was focused in the fabrication and characterization of electrospun PVDF/PLA (50/50 wt%) membranes as a polymeric temperature sensor. Dielectric behavior of the membrane by applying an external stimuli such as temperature was observed. Results of this behavior showed a linear response relating temperature and the dielectric constant of the membrane. The membrane was examinated using scanning electron microscope (SEM) techniques. As a result, low porous flexible membranes were obtained with fiber diameters in a range from 50 nm to 200 nm. In conclusion, polymeric piezoelectric membranes are a promising tool in fields such as biomedical engineering, robotics and electronics as scaffolds, sensors or actuators due to their ferroelectric nature.
本文研究了静电纺丝法制备PVDF/PLA膜的温度特性。静电纺丝是一种多用途的方法,可以产生由各种材料制成的纤维,如陶瓷或聚合物,可以达到纳米范围。聚偏二氟乙烯(PVDF)是一种压电型智能聚合物,常与其他材料结合以改善或修饰其性能。这项工作的重点是制备和表征静电纺PVDF/PLA (50/50 wt%)膜作为聚合物温度传感器。通过施加外部刺激,如温度,观察了膜的介电行为。结果表明,薄膜的介电常数与温度呈线性关系。用扫描电镜(SEM)技术对膜进行了检测。结果,获得了纤维直径在50 ~ 200 nm范围内的低孔柔性膜。总之,聚合物压电膜由于其铁电性质,在生物医学工程、机器人和电子等领域作为支架、传感器或执行器是一种很有前途的工具。
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引用次数: 0
CCE 2018 Author Instructions CCE 2018作者说明
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引用次数: 0
Characterizations of a Selenized Cu(In1-xGax)Se2 Thin Film Absorber Layer Fabricated By a Three-Stage Hybrid Method 三段杂化法制备硒化Cu(In1-xGax)Se2薄膜吸收层的表征
Adhikari Ashok, J. Narro-Rios, O. Nwakanma, Ganesh Regmi, S. Velumani, F. A. Pulgarin-Agudelo
The photovoltaic technology has remained one of the favored green technologies to meet the today’s energy production demand with the solar cell offering a means of tapping into this source of energy. In this study, the 3-stage hybrid (3SH) method was employed consisting of spray pyrolysis and thermal evaporation to deposit the quaternary copper indium gallium diselenide (CIGSe) thin film solar cell absorber layer. The choice of CIGSe semiconductor for the solar cell application stems from some of the desirable qualities which include direct and variable energy bandgap (1.04 - 1.65 eV), high absorption coefficient (≈105 cm−1) and stability. The as-deposited films were selenized to complete the fabrication of the CIGSe absorber layer. The films were characterized for the structural, morphological and electrical properties using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and Hall measurements.
光伏技术一直是最受欢迎的绿色技术之一,以满足当今的能源生产需求,太阳能电池提供了一种利用这种能源的手段。本研究采用喷雾热解和热蒸发相结合的三段式杂化(3SH)方法沉积季铜铟镓二硒化(CIGSe)薄膜太阳能电池吸收层。选择CIGSe半导体用于太阳能电池应用源于一些理想的品质,包括直接和可变能量带隙(1.04 - 1.65 eV),高吸收系数(≈105 cm−1)和稳定性。将沉积膜进行硒化处理,完成了CIGSe吸收层的制备。利用x射线衍射(XRD)、拉曼光谱(Raman spectroscopy)、扫描电子显微镜(SEM)、原子力显微镜(AFM)和霍尔测量对膜的结构、形态和电学性能进行了表征。
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引用次数: 5
Constrained Extremum Seeking with Function Measurements Disturbed by Stochastic Noise 随机噪声干扰下函数测量值的约束极值求
Cesar U. Solis, J. Clempner, A. Poznyak
This conference paper suggests a continuous-time Constrained Optimization algorithm for unknown functions with disturbed measurements based on the Extremum Seeking philosophy and a modification of the Synchronous Detection Method.
本文提出了一种基于求极值思想和同步检测方法改进的具有扰动测量的未知函数的连续时间约束优化算法。
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引用次数: 3
Validation of an EMG sensor for Internet of Things and Robotics 一种用于物联网和机器人的肌电传感器的验证
A. González-Mendoza, A. Pérez-Sanpablo, R. López-Gutíerrez, I. Quiñones-Urióstegui
This paper describes the construction of a proposed EMG sensor which is intended as a future work to apply in the field of technology of Internet of Things (IoT) and exoskeletons. Subsequently, this work presents the validation of the proposed sensor compared with commercial clinical use EMG sensors (Biometrics of Biometrics Ltd. UK and Shimmer 3 of Shimmer Sensing, Ireland) based on Signal to Noise Ratio (SNR) that is being calculated by two different methods. The obtained results from the experimentation show that the sensors Biometrics and Shimmer 3 are around 20dB SNR while, the proposed sensor gets between 11dB and 18dB SNR. Then, it indicates that the proposed sensor is feasible for the application in technologies like IoT (for manipulating home devices through the interpretation of muscle activity) or robotics but is not suitable for applications that involve subjects musculoskeletal monitoring or diagnose.
本文描述了一种拟议的肌电信号传感器的构建,该传感器旨在作为未来在物联网(IoT)和外骨骼技术领域应用的工作。随后,本工作将提出的传感器与商业临床使用的肌电信号传感器(Biometrics of Biometrics Ltd.)进行比较。英国和爱尔兰Shimmer Sensing的Shimmer 3)基于信噪比(SNR),该信噪比是通过两种不同的方法计算的。实验结果表明,biometics和Shimmer 3传感器的信噪比在20dB左右,而该传感器的信噪比在11dB ~ 18dB之间。然后,它表明所提出的传感器在物联网(通过解释肌肉活动来操纵家用设备)或机器人等技术中的应用是可行的,但不适合涉及受试者肌肉骨骼监测或诊断的应用。
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引用次数: 8
Simple Method for Fabrication of Light Diffraction Gratings from Ultraviolet to Infrared 紫外至红外光衍射光栅的简易制作方法
A. Hernández, R. Asomoza-Palacio, Y. Kudriavtsev
Periodical structures with a wave-like shape were fabricated on semiconductors surfaces by utilizing ion milling from a Liquid Metal Ion Gun (LMIG) of bismuth. The symmetrical structures exhibit a well-defined shape and uniformity all over the irradiated area. Wavelength and amplitude of the ripples can be modified by varying the number of pixels and ion fluence, respectively. It was found that the ripples have potential applications as diffraction gratings for visible light. Furthermore, is possible to modify the wavelength of the gratings for applications in the range of infrared and ultra violet, this can be done by selecting the appropriate ion beam diameter. In this work, several gratings were fabricated on Si, Ge and ZnSe surfaces with a wavelength ranging from 294 nanometers up to 4.7 micrometers. A simple and accurate method for fabrication of light diffraction gratings is suggested.
利用铋液态金属离子枪(LMIG)的离子铣削技术,在半导体表面制备了具有波浪形的周期结构。对称结构在整个辐照区均表现出良好的形状和均匀性。波纹的波长和振幅可以分别通过改变像素的数量和离子的影响来改变。结果表明,该波纹具有作为可见光衍射光栅的潜在应用价值。此外,可以通过选择适当的离子束直径来修改光栅的波长,以适应红外和紫外线的应用范围。在这项工作中,在Si, Ge和ZnSe表面上制作了几个波长从294纳米到4.7微米的光栅。提出了一种制作光衍射光栅的简单而精确的方法。
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引用次数: 0
Free Leg Impulse For Extra Weight Lifting Humanoid Walk 为额外的举重类人行走自由腿冲动
A. Ortiz, J. Zannatha
In this paper we propose a ground impulse stage, during the double support phase, to reduce the load in the actuators of the support leg during the single support phase of a biped walking robot. Allowing to carry a considerably extra weight while walking.
在双足步行机器人的双支撑阶段,我们提出了一个地面脉冲阶段,以减少在单支撑阶段的支撑腿的执行机构的负荷。行走时可以承受相当多的额外重量。
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引用次数: 0
期刊
2018 15th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)
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