Limitations in the rapid extraction of evoked potentials using parametric modeling

The rapid extraction of variations in evoked potentials (EPs) is of great clinical importance. Parametric modeling using autoregression with an exogenous input (ARX) and robust evoked potential estimator (REPE) are commonly used methods for extracting EPs over the conventional moving time average. However, a systematic study of the efficacy of these methods, using known synthetic EPs, has not been performed. Therefore, the current study evaluates the restrictions of these methods in the presence of known and systematic variations in EP component latency and signal-to-noise ratios (SNR). In the context of rapid extraction, variations of wave V of the auditory brainstem in response to stimulus intensity were considered. While the REPE methods were better able to recover the simulated model of the EP, morphology and the latency of the ARX-estimated EPs was a closer match to the actual EP than than that of the REPE-estimated EPs. We, therefore, concluded that ARX rapid extraction would perform better with regards to the rapid tracking of latency variations. By tracking simulated and empirically induced latency variations, we conclude that rapid EP extraction using ARX modeling is only capable of extracting latency variations of an EP in relatively high SNRs and, therefore, should be used with caution in low-noise environments. In particular, it is not a suitable method for the rapid extraction of early EP components such as the auditory brainstem potential.     

Parametric oscillator tuning curve from observations of total parametric fluorescence

Measurements of total emitted parametric fluorescence power are presented and used to fix one point on the predicted tuning curve of a parametric oscillator. The method is particularly useful for predicting the tuning curve of infrared pumped parametric oscillators. Experimental results, which verify the usefulness of the technique in a 1.06-μ-pumped oscillator, are presented.     

Conformal Galerkin testing for VIE using parametric geometry

A moment method solution of a volume integral equation (VIE) using parametric geometry is presented. Typical Galerkin testing is shown not to be appropriate for curvilinear geometries, and a new testing scheme is proposed. By exploiting the orthogonality relationships between covariant and contravariant unitary vectors, testing functions in contravariant projection form and field expansion basis in covariant projection form were chosen.     

Multi-field packet classification using ternary CAM

A new method for multi-field packet classification using a ternary CAM (TCAM) is presented. It is based on a preprocessing step that encodes classification rule information in the form of prefixes within an intermediate search key. The scheme enables TCAMs to handle larger rule sets more efficiently     

基于双模式的产品指标本体概念抽取

由于人们对产品指标执行情况的关心日益增加,人们需要一种能够清晰描述产品指标的方法,而以本体为基础描述产品指标的方法由于其清晰的领域知识结构能够为统计分析打好基础成为目前研究者研究的主要方向之一。为了减少产品指标本体构建对领域专家的依赖度,文中提出了一种双策略结合的产品指标本体概念抽取模式,针对产品指标数据的结构特点,融合两种分类特征重叠范围较小的策略分别对关键词赋予权重并加权排序,之后可由人工挑选或设定阈值确定领域概念。实验证明使用该方法抽取概念相较于单一策略准确性有所提高,且抽取结果是有效的。     

A new feedback control method to stabilize fiber-optical parametric oscillators for clock extraction

A new feedback control technique with the capability of dynamic compensation for the cavity length of fiber-optical parametric oscillators (FOPOs) is proposed by analyzing the time delay dependence of the idler optical power. Our experiments show that the idler optical power is approximately proportional to the FOPO cavity length variation or the resulting time delay, and then an electronically tunable optical delay line can be used to significantly improve the stability of the FOPO. By feeding back the idler power, a stable 10 Gb/s clock recovery based on the FOPO is obtained and the normalized time jitter of output clock signal remains at about 1.1%.     

Possible travelling-wave parametric amplifier using the Gunn effect

It is possible to consider the Gunn-effect domain as the boundary conductor of a microstrip transmission line. It is shown that these domains may be used to vary periodically the impedance of the transmission line, and that these variations may pump a travelling-wave parametric amplifier.     

Imaging devices using the charge-coupled concept

A unified treatment of the basic electrostatic and dynamic design of charge-coupled devices (CCD's) based on approximate analytical analysis is presented. Clocking methods and tradeoffs are discussed. Driver power dissipation and on-chip power dissipation are analyzed. Properties of noise sources due to charge input and transfer are summarized. Low-noise methods of signal extraction are discussed in detail. The state of the art for linear and area arrays is presented. Tradeoffs in area-array performance from a systems point of view and performance predictions are presented in detail. Time delay and integration (TDI) and the charge-injection device (CID) are discussed. Finally, the uses of the charge-coupled concept in infrared imaging are discussed.     

新概念多功能智能快递提取箱

新概念多功能智能快递提取箱属电子信息技术领域,主要利用ARM处理器、嵌入式linux操作系统及QT可视化桌面和zigbee无线物联传感网等技术,PC机和嵌入式服务器相结合实现了智能识别、远程监控、远程管理的功能,以此构成了新概念多功能智能快递提取箱,实现了物品(邮递快件)的暂存。     

On the virtual array concept for higher order array processing

For about two decades, many fourth order (FO) array processing methods have been developed for both direction finding and blind identification of non-Gaussian signals. One of the main interests in using FO cumulants only instead of second-order (SO) ones in array processing applications relies on the increase of both the effective aperture and the number of sensors of the considered array, which eventually introduces the FO Virtual Array concept presented elsewhere and allows, in particular, a better resolution and the processing of more sources than sensors. To still increase the resolution and the number of sources to be processed from a given array of sensors, new families of blind identification, source separation, and direction finding methods, at an order m=2q (q/spl ges/2) only, have been developed recently. In this context, the purpose of this paper is to provide some important insights into the mechanisms and, more particularly, to both the resolution and the maximal processing capacity, of numerous 2qth order array processing methods, whose previous methods are part of, by extending the Virtual Array concept to an arbitrary even order for several arrangements of the data statistics and for arrays with space, angular and/or polarization diversity.     

Optical sensor for temperature measurement using bimetallic concept

In this paper, we report an optical fiber sensor for measuring temperature based on bimetallic concept. The sensor is designed by following the basic principle of Fabry–Perot interferometer and theoretical detail of the sensor has been outlined here with a numerical study. An important feature of the proposed sensor is that the fabrication will be done on a commercial multimode optical fiber. The Micro-Electro-Mechanical Systems (MEMS) based fabrication process could be performed directly on a multimode optical fiber end face which will eliminate the need for adhesive in packaging. The sensor could be fabricated as sensor arrays for micro level applications. The potential application of the proposed optical sensor includes biomedical applications, nano research, microfluidics, and other MEMS devices.     

基于曲线拟合的棋盘角点提取算法

由于环境及相机拍摄效果的影响,导致对棋盘格进行角点提取时出现许多错误和冗余的角点,为此提出了一种基于曲线拟合的棋盘角点提取算法。该算法是在Harris角点检测算法的基础上,将多项式曲线拟合应用到提取的结果中,更加精确地提取出亚像素角点,实验结果表明该算法是有效可行的。     

The anti-circuit concept for the characterization of activecircuits using electromagnetic simulations

The anti-circuit is introduced as a new concept in network theory. A new technique based thereupon, for the combination of electromagnetic field simulations of planar circuits and the analysis of complex active circuits is proposed. This technique allows the incorporation of passive lumped elements as well as the passive metallization of active components into electromagnetic simulations and provides a simple interface for active and nonlinear simulations     

Magnetic tunability of fiber optical parametric oscillators with optical clock extraction

A 10 Gb/s all-optical clock extraction based on magnetically controllable fiber optical parametric oscillator (MC-FOPO) is demonstrated.The operation properties of the magnetic control unit,composed of a solenoid and a magneto-optic crystal of high Verdet constant,are experimentally investigated.By adjusting the drive current of the solenoid,the magneto-optic crystal unit may serve as a tunable optical fiber delay line with polarization control to some extent.The experimental results show that the MC-FOPO is capable of repetitively magnetic tunability desirable for all-optical clock recovery.     

High resolution parametric modelling for two-dimensional radar target using prony algorithm

On the conditions of low-resolution radar, a parametric model for two-dimensional radar target is described here according to the theory of electromagnetic scattering and the geometrical theory of diffraction. A high resolution estimation algorithm to extract the model parameters is also developed by building the relation of the scattering model and Prony model. The analysis of Cramer-Rao bound and simulation show that the method here has better statistical performance. The simulated analysis also indicates that the accurate extraction of the diffraction coefficient of scattering center is restricted by signal to noise ratio, radar center frequency and radar bandwidth.     

基于Encoder-Decoder网络的列车轮对激光曲线提取

提出了一种基于Encoder-Decoder网络的列车轮对 激光曲线精确分割的算法。针对列 车轮对激光曲线数据集局部特征丰富、语义信息简单的特点,设计了具有深度较浅、分辨率较 高、细节表现良好的网络。设计的网络很好的利用了密集链接机制和上采样模块,加强了特 征复用以及特征传播,具有较少参数的同时,能多尺度提取上下文语义信息。实验证明,En coder-Decoder网络相比于其他网络在列车轮对激光曲线提取上表现出优异的性能。基于Enc oder-Decoder的网 络在列车轮对激光曲线数据集上交并比、召回率、准确率和F1_score指标 分别达到了86.5%、89.2%、99.9%、85.0%,能够比较精准提取列车轮对激光条纹。同时Enco der-Decoder网络在进行列车轮对激光条纹分割时能在一定程度上改善噪声对条纹提取的影 响。因此在铁路安全方面具有良好的应用前景。     

Image coarsening by using space-filling curve for decomposition-based image enhancement

We propose a novel space-filling curve based image coarsening method, which automatically extracts a base-layer from an input image while still preserving its structural context, meaningful details, et cetera. In the proposed method, specifically, a one-dimensional edge-preserving smoothing filter, which is called a vector ε-filter, is applied to an input image along a space-filling curve. In this regard, the space-filling curve is constructed by using a minimum spanning tree which extracts the structural context of the input image. This novel image coarsening approach is completely different from all conventional approaches employing any kind of two-dimensional filter window. Furthermore, this coarsening method can effectively produce an aggregation of texture details as well as enhance sharp edges, while preserving structural contexts such as thin lines and sharp corners. The main benefit of the coarsened image by the proposed method is its suitability for extracting fine features of an input image for decomposition-based image enhancement. In this paper, the structural-context-preserving image coarsening capability of the proposed method is verified by some results from experiments and examples. Then we show our new method’s characteristics in practical application to decomposition-based image enhancement by using some other examples.     

Evaluation of motor characteristics for hybrid electric vehicles using the hardware-in-the-loop concept

If the concept of Hardware-in-the-Loop (HIL) is applied to component testing, characteristic of component of hybrid electric vehicle in real vehicle environment can be evaluated without actually installing that component in real vehicle. In this paper, when commercially available test motor is adopted as a drivetrain of hybrid vehicle, we need to figure out which drive train configuration would be best for specific purpose. The characteristic of the motor when it is installed in the vehicle at different drive train and driving mode can be simulated and actual characteristic can be measured. Also both results can be compared. For the hardware characteristic measurement, test facility which consists of vehicle simulator and dynamometer is required. In this case, vehicle controller in the vehicle simulator is used as a vehicle controller and dynamometer is used to simulate vehicle dynamics. Two drive train types, 4-motor series, and 2-motor parallel type are proposed. Vehicle speed tracks driving cycle speed command well in both simulation and HIL implementation.     

Second-derivative sensitivity using the concept of the adjoint network

Second-derivative sensitivities for linear time-invariant networks are derived by an extension of the method used by Director and Rohrer to calculate first-derivative sensitivities.