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The emerging 650 V large current rating, Enhancement-mode (E-mode) Gallium Nitride High-Electron-Mobility Transistor (GaN HEMT) is a promising device for low to medium power, high power density converters (e.g., motor drives, battery chargers), which require high robustness levels. Thus, a comprehensive study of the short circuit behavior of high power E-mode GaN HEMT is the subject of this paper...
The research object of this paper is a single-shaft parallel hybrid electric vehicle (PHEV). A noticeable jerk or torque fluctuation in the hybrid powertrain may result in the vibration of the drivetrain and an unpleasant driving sensation during transition from the motor driving mode to the hybrid driving mode. According to the analysis of the vehicle dynamics, the switching process is divided into...
In this paper, we investigate the power allocation algorithm for beam division multiple access (BDMA) transmission in massive multiple-input multiple-output (MIMO) communications under Rician fading. Based on the fact that eigenbasis at the base station (BS) become identical and independent of user equipment as the number of BS antennas goes to infinity, jointly correlated channel model is introduced...
With the rapid development of the wide bandgap (WBG) power transistor technology, the latest Silicon-Carbide and Gallium-Nitride (SiC and GaN) based power transistors can be used as the main switches in the medium power (≥10 kW) conversion systems. Electrical signal based efficiency measurement could be very challenging due to the high-frequency output signals and the high power to loss ratio. In...
This paper considers the parameter estimation of feedback nonlinear systems with colored noise. According to the data filtering technique and maximum likelihood principle, a maximum likelihood forgetting factor stochastic gradient identification method is presented for the discussed feedback nonlinear systems. The simulation results indicate that the proposed algorithm is effective.
Reinforcement learning (RL) depends critically on the choice of reward functions used to capture the desired behavior and constraints of a robot. Usually, these are handcrafted by a expert designer and represent heuristics for relatively simple tasks. Real world applications typically involve more complex tasks with rich temporal and logical structure. In this paper we take advantage of the expressive...
In the current study, the effects of deep cryogenic treatment (DCT) on the microstructure and mechanical properties of Sn-3.0Ag-0.5Cu (SAC30) solder joints were investigated. the mechanism of microstructure, tensile strength and fracture path were discussed. The samples were placed in liquid nitrogen environment at 77 K for 24, 72, 168, and 600 hours. The experimental results show that the strength...
Morphological structure has a decisive influence on the microwave absorbing properties of three-dimensional (3D) nano zinc oxide whisker (ZnOw) material. However, due to the complexity of the microstructure, it is still a difficult challenge to develop a fast and accurate optimization method for this kind of nanostructured material. Hence, as an attempt, we enhance the generality of our optimization...
Here we present the design and performance of tunable dual-band and wide-angle perfect absorber, consisted of graphene and VO2. Simulation results show the device operating in long-wave infrared region. The two absorption peaks, including location and intensity, can be tuned in a wide range by either electrical, thermal, or their combination.
An active hybrid-material longwave infrared absorber based on graphene ribbon array (GRA) was studied. Each pair of the ribbons is conducted by lossy metal. Simulation results reveal that its absorption peak in resonance is broader than that of GRA absorber with no metal conduction, and wavelength can be tuned by varying chemical potential of the GRA.
With the increasingly prevalence of building automation devices and two-way communication infrastructure, home energy management has drawn lots of attentions in recent years. As a newly emerged residential energy resource, the home plugged electric vehicle (EV) has the potential to discharge energy and serve the home consumption. This paper proposes a home energy management (HEMS) by considering the...
Meta-search engine is a comprehensive search tool, which is build base on those member search engines. All result entities reported by member search engines are merged into one ranked list according to their quality. It is well knowing that the core problem in meta-search engine is how to merge the results and provide user with a more effective rank list. This paper dealt with a synthesized merging...
Using constant current source as the excitation signal is an effective method for system testing of the aircraft. At present, the constant current source circuit built by TL431 voltage regulator does not meet the system test requirements of the aircraft under the condition of small current output. And when the temperature span is large, the working circuit does not have the ability to inhibit the...
In this paper, we propose an interference coordination strategy for full-dimension (FD) multiple-input multiple-output (MIMO) heterogeneous networks (HetNet). The HetNet is formed by a single macro base station (BS) coexisting and sharing the same spectrum with a number of small cells. Two-dimensional (2D) large-scale antenna array is deployed at macro BS, while regular MIMOs are deployed at small...
In order to reap the full scale of benefits of millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems, the design of antenna arrays at the transmitter or receiver becomes more critical due to the propagation characteristic at mm-frequencies. In this paper, we investigate the steering vector and array factor by considering three types of planar antenna arrays, namely uniform...
In order to seal the sealing ports of battery lid quickly and accurately, an automatic sealing system based on machine vision is presented in this paper. The whole system is composed of the light source, industrial camera, industrial control unit and a 4-degrees of freedom industrial robot. Specifically, the coordinates of the battery lid is calibrated by visual calibration method accurately. Then...
Codewords in array format find applications in disk storage where columns are stored on different disks in combination with row parity checks across disks that protect data against disk failures. The addition of global parities protects against sector failures on any of the disks while keeping storage overhead low. We construct sector-disk array codes that tolerate any combination of two disk failures...
Package lid is usually mounted above the integrated circuits (ICs) to protect the die and improve the thermal performance. However, the package lid may be an unintentional radiation contributor due to the resonance of package lid and package substrate. In this paper, based on a typical wire-bonded ball grid array (WB-BGA) package, perfect magnetic conductor (PMC) packaging is used to suppress the...
Electrical system has become a growing trend in the past decades. Electrical motors are the central components that convert electrical power into mechanical power in motor-driven systems. Computer based simulation is used widely in motordriven system design due to the increase of system complexity. This paper presents an integrated solution to design and simulate complex, system level motor system...
This paper investigates the consensus problem of a class of multi-agent systems with switching and undirected topologies subjected to external disturbances. By model transformation, the consensus problem is changed into the energy-to-peak control of a reduced-order closed-loop system. Then, with the aid of graph theory, Lyapunov stability theory and some decoulping techniques, a new LMI-based method...
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