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Pre-surgical mapping of sensorimotor and language functions is crucial to reduce neurological deficits in epilepsy and tumor resection surgery. As non-invasive mapping, both resting-state and task-evoked functional MRI has been explored in pre-surgical mapping. In lack of standardized test paradigm, the reliability of fMRI mapping is still a concern for clinical use. In this study, to improve the...
We report a simple setup for two-step quadrature phase-shifting holography that could be useful and suitable for industrial applications. Only two on-axis holograms are captured with the system and a complex hologram is formed from the two holograms. Autocorrelation is used to quantify the quality of all the reconstructed images from the holograms. We have tested a transparent sample as well as a...
We propose a method to combine two phase-shifted holograms into a complex hologram. The reconstruction of the complex hologram will have no twin image noise but have a constant zeroth-order beam, which could be attenuated by subsequent optical filtering of the reconstructed image.
For the problem of back-to-back PWM converter open circuit fault in wind power generation system, the operation principle and fault classification standard of PWM converter are introduced. Based on the hardware redundancy, a fault tolerance strategy for back-to-back PWM converter open circuit fault is presented in this paper. According to the symmetrical structure, using the switching device, the...
In tonal languages, like Chinese, lexical tone serves as a key feature to provide contrast in word meaning. Behavior studies suggest that Mandarin Chinese tone is categorically perceived. However, the neural mechanism underlying Mandarin tone perception is still poorly understood. In this study, an Oddball paradigm was designed by selecting two standard-deviant stimulus pairs with same physical distance...
Registration is one of the key technologies of augmented reality system. In order to realize accurate and realtime registration and keep the right position and orientation of a virtual object in real world scenarios, a new registration method based on ORB and KLT algorithms is proposed. It detects the target from the video frame first and calculates the homographic matrix of initial camera poses,...
There is an inverse response of the pressure in the penstock when manipulating the guide vane of a hydraulic turbine in hydropower plant. Considering safety issues, it is of interest to estimate this dynamic state to compensate the uncertainties in the pressure measurements. Besides, the mathematical model of a hydro power plant is nonlinear, which may make classic extended Kalman filter (EKF) theoretically...
In this study, we explore the discriminability of high gamma activities from speech production cortex during the overt articulation of two sentences. Neural activities were recorded from one intracranial electrode placed approximately over the posterior part of the inferior frontal gyrus. By employing a dynamic time warping (DTW) method to realign single-trial high gamma response during speech productions,...
This paper addresses the issue of regulating the water level of a reservoir in a hydropower plant with nonlinear predictive control (NMPC). Besides, according to pre-specified water level variant limits, an error tolerance NMPC (ET-NMPC) was extended from a regular NMPC. A nonlinear mathematical model was developed for dynamics of water reservoir level. A theoretical hydrology model was included to...
Electrocorticography (ECoG) is an emerging tool to map brain functions in the context of neurosurgical intervention. Previous mapping methods based on the event related power spectrum are prone to noise. To improve the robustness of cortical function mapping, general linear model (GLM), which has been widely used in the analysis of functional magnetic resonance imaging (fMRI) data, is applied to bandpass...
The discovery of mirror neuron system in the macaque study in the 1990s explored a new way to investigate motor imitation. By using the electrocorticographic (ECoG) with high resolution in both spatial and temporal domains, this paper studies brain function during both observation and execution of a simple finger tapping task. Four epilepsy patients were asked to watch simple finger tapping video...
Mass customization product design in the virtual design system based on B/S mode is studied. The approach is based on prototype product parameterized modeling and VRML language, and is supported by Eletrical Apparatus Product Intelligent Design System (IDS). The IDS processes the customer's requirements of products and produces a design result document including the designed product structure and...
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