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Due to the superiority in handling label ambiguity, multiple instance learning (MIL) has been introduced into adaptive tracking-by-detection methods to alleviate drift and yields promising tracking performance. However, the MIL tracker assumes that all samples in a positive bag contribute equally to the bag probability, which ignores sample importance. To address this issue, in this paper we propose...
A new laser facility with 30kJ/ns/3ω(8 beams) output energy has begun operation with good performance. Another single laser prototype pushes 1ω output energy to 17.5kJ/21ns in 350mm×350mm aperture with four-pass main amplifier architecture.
Electroencephalogram (EEG) is a widely used experimental tool in psychological research. In this study, we used EEG to research the driving safety by measuring the dynamic changes of drivers' emotions in a long tunnel. Through the study whether there was a tunnel, and whether there was a large amount of traffic flow in the tunnel, we found a long tunnel only makes a slight negative effect on driver's...
This paper presents the stability analyzed results of a microgrid system containing an offshore wind farm (OWF), an offshore tidal farm (OTF), and a seashore wave farm (SWF) fed to an onshore power grid through a high-voltage direct current (HVDC) link based on voltage-source converter (VSC). The characteristics of the studied OWF, OTF, and SWF are simulated by an equivalent aggregated wind doubly-fed...
This paper investigates the characteristics of both efficiency and voltage regulation of a practical single-phase distribution transformer when the shape and dimension of the laminated core are varied. Typically, the iron core of a traditional transformer is composed of E- and I-shape laminations to reduce core loss. The reluctance for the magnetic-flux path inside the iron core of a transformer is...
Due to the skin and proximity effect, the conductive losses rectangular conductors under high frequency working conditions increase. And the conventional one-dimensional model, which is currently used for the calculation of rectangular conductor's conductive losses, leads to a considerable error due to the ignorance of edge effect. To eliminate the error, this paper proposes a two-dimensional analytical...
The U-V or V-V winding connections of two single-phase distribution transformers are widely utilized in distribution systems to deliver power to various three-phase and/or single-phase loads. Such special winding connections of distribution transformers can cause three-phase voltage unbalance in distributions systems, which could also lead to unexpected trip of ground relay, extra power losses on...
This paper introduces a 97% efficiency medium voltage (MV) Solid State Transformer (SST) based on two-level single stage (TLSS) topology and 15 kV SiC MOSFETs. Series resonant converter (SRC) is implemented as the main stage and is identified as a current source (CS) SRC for the first time. Equivalent resonant frequency of the proposed CS-SRC is analyzed in both time domain and frequency domain. Resonant...
In order to evaluate the insulation condition of gas insulated switchgear (GIS) by using the ultra-high frequency (UHF) method, attempt to estimate PD current using the finite difference time domain (FDTD) method was carried out. The influence of PD current parameters and the position of measuring point on the received electromagnetic (EM) waves was studied. The EM waves received by using UHF sensors...
This paper presents an energy-efficient visible light communication (VLC) receiver SoC that utilizes ambient light rejection and post-equalization techniques for emerging LiFi applications. Based on ordinary phosphorescent white LEDs, a 24-Mb/s IEEE 802.15.7-compliant LiFi link is demonstrated over 1.6 m with a BER below 10−9.
This work presents a 650-nm wavelength laser diode-based visible laser light communication (VLLC) system. By optimizing the modulation method, a 140% improvement in data rate is obtained from 90 Mb/s to 220 Mb/s over 1.8 m compared to conventional on-off keying modulation.
Attack vulnerability is one of the fundamental properties of complex interdependent networks, which has attracted a lot of research efforts in recent years. In this paper, we study the effect of degree heterogeneity on structural vulnerability of interdependent networks when they suffer targeted attacks. Firstly, we construct an interdependent system model composed of two network components. By adjusting...
Load balancing can effectively balance the system load, improving the speed of processing and increasing the utilization of resources in cloud computing. Thus how to optimize load balancing has become one of the hot spots of current researches. The existing virtual machine migration strategies to a certain extent promoted the load balancing, but did not take into account the existence of service relationships...
Cooperative caching that utilizes the distributed storage of popular files is regarded as one prospective technology for offloading the traffic for the base station (BS) and boosting the capacity of the wireless networks. It's a critical issue to achieve the goals that the content providers (CPs) are encouraged to download and cache the popular content items so that the CPs can share them with the...
Recently, mobile cloud computing (MCC) is drawing substantial attention due to potential reduction on local energy consumption and local execution time. To further satisfy the requirement of latency-intensive applications in the future, fog computing is proposed to take full advantages of close-by nodes with available resources, thus decreasing the transmission time during computation offloading....
In the application of microwave photonic links, a solution is proposed to suppress the harmonic of the silicon microring modulator by optimizing the bias voltage applied on this modulator, and the influence of input rf power on this bias voltage is also analyzed. Simulation results show that this optimized bias voltage varies by the input rf power due to the nonlinearity in the silicon microring modulator,...
In order to solve the problem that the accuracy of flaws identification in ultrasonic testing is not high enough due to the error in sensor information acquisition and the noise interference in the detection environment, a method of flaws identification in ultrasonic testing based on evidential reasoning rule (ER rule) is studied. Firstly, ER rule is proposed to consider the reliability and weights...
A controlling circuit for varactor diodes based on K-band substrate integrated waveguide (SIW) leaky-wave antenna is presented in this paper to accomplish pattern reconfiguration. The varactors' DC bias is supplied by a sawtooth wave generated from the FPGA which allows automatic and continuous variation of the capacitance of the varactors. An isolating circuit between DC voltage and RF is applied...
This paper proposes a radiation pattern raconfigurable antenna (RPRA) with the structure of meta-surface(MS). The antenna consists of two parts: a special MS and a slot antenna. It has good directionality, low profile and high gain. By controlling the PIN diode switches, the equivalent length of the gaps can be changed significantly. In this way, we achieve the performance of radiation pattern reconfigurable...
Design of a three-cavity Ka-band MW-level gyroklystron operated at the fundamental TE02 mode is presented in this paper. The initial design of the magnetron injection gun (MIG) and interaction circuit has been completed by using the PIC (Particle in cell) code MAGIC. The PIC simulation shows this gyroklystron can deliver an output power of more than 1.5 MW with a gain of > 35 dB at 36 GHz. The...
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