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Silicon carbide (SiC) devices have its unique advantages of high operating temperature, high voltage capability with low switching losses when compared to its silicon counterparts. This paper presents a systematic method for long-term reliability analysis for SiC devices. The reliability block diagrams (RBDs) have been established for a SiC power module with standard wire-bonded package. The reliability...
Extracting efficient features is an important stage in Brain Computer Interface (BCI). In motor imagery (MI) based BCI, features that characterize ERS/ERD phenomenon could favor the discriminant of different kinds of MI tasks. Common Spatial Pattern (CSP), a spatial filtering method which is often used in MI-EEG feature extraction, shows outstanding performance due to its effectiveness in maximizing...
This paper presents an experimental switching behaviour comparison of GaN HEMT and SiC MOSFET against their Si competitors, the Si SJ MOSFET and high speed Si IGBT, in the 650 V class. The devices are first compared using their respective datasheets. The test circuit is introduced and hard switching tests under inductive load are performed to reveal the switching performance of the devices. The differences...
The objective of this paper is to determine the lifetime of DC current vacuum arc in contact materials of CuCr50 and CuCr25. Commercial vacuum interrupters with contact materials of CuCr50 (50% Cr) and CuCr25 (25%Cr) were designed. A DC current vacuum arc lifetime circuit was set up. The vacuum arc was drawn by contact separation. The vacuum arc voltage duration indicated the DC vacuum arc lifetime...
A photonic approach to generate phase-coded signal with large frequency continuous tunability based on dual parallel unbalanced temporal pulse shaping (DP-UTPS) system is proposed. In DP-UTPS system, in order to realize the different intensity modulation of the input optical Gaussian pulse in the upper and lower branches, sine signal and cosine signal are respectively applied. When the corresponding...
Deep convolutional neural networks (CNNs) have made tremendous development in the field of image recognition and natural language processing. However, there is still a lack of knowledge of using CNN models to decode motor imagery based Brain Computer Interface (BCI). This paper presents a method applying CNN to analyze the EEG signals, which are produced by left and right hand motor imagery tasks...
Wide Band Gap (WBG) transistors using materials such as Gallium Nitride (GaN) and Silicon Carbide (SiC) offer superior electrical and thermal properties, as well as fast switching capability. However, the high dv/dt and high di/dt may cause ringing with the parasitic inductances and capacitances in the switching loop, increasing overshoot voltages and reducing confidence in the design. Also, making...
The thermal finite element model of the power module based on the actual physical conditions is not easy to be consistent with the experimental results, limited by the accuracy of the input conditions. In this paper, a method of calibrating the transient thermal finite element model using the measured thermal structural function is proposed and practiced. The structural functions derived from the...
Anomaly data in real-time water quality monitoring systems can cause false alarms and significantly decrease system stability and reliability. We propose a novel anomaly detection algorithm for water quality data using dual time-moving windows, which can identify anomaly data from historical patterns in real-time. The algorithm is based on an autoregressive linear combination model, a prediction interval...
High radio-frequency phase-coded waveform generation based on dispersion-compensated optoelectronic oscillator (DCOEO) is proposed and experimentally demonstrated. The carrier frequency range of the generated phase-coded microwave, which exactly varies from 4 GHz to 45 GHz, can cover Ka band for Radar applications.
A dual-passband microwave photonics filter (MPF) for fiber axial measurement is proposed and experimentally demonstrated. The MPF is mainly implemented using a phase modulator (PM) and two cascaded fiber Bragg grating Fabry-Perot (FBG-FP) filters with different central wavelengths. According to the phase-modulation to intensity-modulation (PM-IM) conversion in the MPF, dual-passband can be generated...
The technology of Bank-to-Turn is an important development direction of hypersonic glide vehicles' control. But there is a strong coupling between roll channel and yaw channel when the vehicle is in rolling maneuver. In this paper, a dual decoupling fusion control method is presented based on aileron-rudder cross decoupling control and model reference global sliding mode control for the problem of...
Photonic generation of a linear-frequency microwave waveform with ultra-wide frequency tunable range based on dispersion-compensated optoelectronic oscillator (DCOEO) is proposed and experimentally demonstrated. The microwave carrier frequency of the generated linear-frequency microwave waveform varies from 4 GHz to 45 GHz.
A wideband frequency tunable microwave generation based on a dispersion compensated optoelectronic oscillator (OEO) is proposed and demonstrated. A frequency tuning range from 3–42 GHz is obtained simply by suppressing the phasemodulation to intensity-modulation (PM-IM) conversion caused by long single mode fiber (SMF). The phase noise is measured to be less than −110 dBc/Hz@10kHz within the whole...
The problem of the stability analysis of genetic regulatory networks (GRNs) with time varying delays are proposed in this paper based on a new delay-decomposing method. Some appropriate Lyapunov-krasovskiis functionals are defined on each of the obtained subintervals, some integral inequalities and the convex combination technique are utilized to deal with the bound of the derivative of the Lyapunov-krasovskiis...
In this paper, the Balance Equation is derived based on the theory of Internal Model Control (IMC). It is revealed that there is a linear algebraic relationship between the proportional and integral contributions of the PID controller output. Through analysis of the Balance Equation, it is found that loss of balance between the proportional and integral contributions is the root cause for the degradation...
This paper reports the development of Level Set Method (LSM) to simulate the etching process of complicated structures of quartz. This method is different from atomic approaches like Continuous Cellular Automaton(CCA) or Monte Carlo(MC), which need to calibrate many parameters of the simulation models. On this basis, a simulator for quartz wet etching was established to make it flexible to simulate...
With the development of the cloud classroom and its learning environment, improving students' attitudes using the cloud classroom is very significant. This study invests the attitudes towards the cloud classroom with 281 students in high school via a questionnaire survey. We use the structural equation model to test the relationship between students' attitudes and learning resources, perceived responsiveness...
This study explores for the first time the use of the Evolutionary Kinetic Monte Carlo method (EKMC) to describe the etch rate anisotropy of quartz and three-dimensional microstructures and topography etched on Z-cut, AT-cut and BT-cut substrates using some mask patterns. Based on the evolutionary algorithm, the EKMC can properly transform the (facet specific) macroscopic etch rates of several crystal...
The idea of employees leveraging their personal mobile devices for their work (Bring Your Own Device, or BYOD) is becoming increasingly popular in recent years. As BYOD users will use various digital goods (such as cloud services and mobile software) for their work and personal purposes via the same mobile devices, it brings serious security risks into both the cloud and mobile devices. Generally,...
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