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This paper proposes a novel bi-directional battery charger structure for V2G applications. The proposed structure consists of a flexible AC/DC converter and a series resonant converter (SRC). The flexible AC/DC converter changes the DC bus voltage according to the power flow direction of the charger. In this way, SRC which basically only works in buck mode is able to operate in both directions, and...
This paper proposed an analog controller without multiplier to realize the Maximum Power Point Tracking (MPPT) for PV applications based on an improved perturbation and observation (P&O) method. Comparing with traditional analog MPPT controller designs which need a multiplier to calculate the power value to implement P&O, the proposed method only perturbs and observes single variable to get...
A short-circuit fault protection strategy based on the direction of bus-side capacitor discharge current for a high-surety power supply, known as Super Uninterruptable Power Supply (Super UPS), is studied in this paper. It consists of multiple energy sources and storage components. All energy sources and storage components are connected to a common DC bus through converters in the system. If a short-circuit...
A battery-assisted qZSI features buck/boost characteristic by introducing shoot-through states. It makes full use of the fluctuant power, which generated from photovoltaic or fuel cell, by the energy-stored battery paralleled to the quasi-Z-source capacitor. Previous studies discussed the steady state performance and energy storage management for batteries. However, the dynamic tracking performance...
The growing development of distributed generation and storage devices has allowed the growth of micro-grids in low voltage and medium voltage grids. This caused the increase of voltage harmonics with high frequency in LV and MV grids. This aspect is most important to right operations of the VSI-current controlled. This paper investigated the effect of the voltage high frequency ripple in the point...
In this paper, a compact two-patch array design is proposed for unmanned aerial vehicle applications. High gain directive antennas are employed to extend the wireless transmission range of either control signals or data streams. Considering that the handheld remote controller is likely to be aligned toward the airplane during operation, a compact patch array, which can be attached to the top of a...
The robust transceiver design in dual-hop up-link multi-user multiple-input multiple-output (MIMO) system with amplify-and-forward relay is presented in this paper. Different from the most existing works, a complex channel model is adopted, the antenna correlation at both ends of the channel and the channel estimation errors are taken into account. The proposed design method provides a joint iterative...
In the past decade, Convolutional Neural Networks (CNNs) have been demonstrated successful for object detections. However, the size of network input is limited by the amount of memory available on GPUs. Moreover, performance degrades when detecting small objects. To alleviate the memory usage and improve the performance of detecting small traffic signs, we proposed an approach for detecting small...
Predicting the deformation based on landslide multi-mode monitor data is a critical issue of reliable data mining and comprehensive knowledge discovering of landslide for early warning. Due to the complex changes of multi-mode monitoring data and interaction effect caused by geological and geomorphological, hydrological, and anthropogenic factors, most of the deformation prediction methods cannot...
This paper is mainly focus on bidirectional on-board charger with high performance and low cost. With SiC MOSFET, it is possible to make the on-board charger high efficiency, high power density and light weight. However, the price of the SiC MOSFET is higher than Si based MOSFET. Therefore, a high performance on-board charger with a small number of SiC MOSFET is the key factor to limit the cost of...
Transmission electron microscopy (TEM) plays an important role in the structural analysis and characterization of materials for failure analysis in integrated circuit industry as device shrinkage continues. It is well known that a high quality TEM sample is the important factor. When the TEM sample was in preparation for cross-section or plane analysis, curtain effect and positioning are the problems...
In this paper, we propose a distance-adaptive load balancing algorithm to improve spectrum efficiency and to reduce power consumption in flexible bandwidth optical networks. Simulation results show that our proposed DALB algorithm significantly reduces blocking probability but consumes more power consumption compared to the traditional Dijkstra algorithm under the 40 Gbps, 100 Gbps, and mixed line...
In this paper, we investigate tradeoff between failure probability and load balancing in flexible bandwidth optical networks. We develop a tradeoff-principle algorithm (TPA) to improve spectrum efficiency and introduce a traditional algorithm (TA) for comparison. Simulation results show that TPA achieves better performance compared to TA.
Randomized gradient-free algorithms through sequential Gaussian smoothing are proposed for distributed optimization over time-varying random network, where the collective goal of agents is to minimize the sum of locally known cost functions. Each agent has access to its own nonsmooth convex function, constrained to a commonly known convex set. Based on sequential Gaussian smoothing of the objective...
With ultra-dense networks (UDNs) becoming one of key technologies for the fifth generation (5G) networks, it is an important problem to evaluate the impact of user mobility on UDNs. In this paper, random way point mobility models and the stochastic geometry theory are utilized to evaluate the energy efficiency of 5G UDNs. Considering the random deployment of base stations, the coverage probabilities...
Accurate quantification of brain tissues is a very challenging problem in neuroimaging, such as quantification of gray matter (GM), white matter (WM) and cerebrospinal fluid (CSF), and white matter lesions (WMLs). However, on many cases brain tissues and white matter lesions cannot be segmented and separated simultaneously by current techniques. Recently, a TRIO algorithm (TRIOA) is proposed to integrate...
With the continuously increasing power of computation, especially in the region of parallel computing, computerbased texture analysis, computer-assisted classification methods, automated pathology detections, etc. are more and more commonly performed on medical images, like X-ray, Magnetic Resonance (MR) images, for clinical or scientific purposes. These procedures almost always include a stage of...
As an important part of ICT in education, teacher's ICT application ability in teaching and research is vital to improve teachers' professional development and to promote the education modernization. Understanding the development of teacher's ICT application ability in foreign countries and analyzing the difference between teacher's application ability in urban and rural are an important reference...
ICT in education is a significant strategic to promote the development and innovation of education. Most research studies focus on the establishment of the evaluation indicator system, but performance evaluation is important to the development of ICT in education. Based on the gray theory and fuzzy algorithm, this study analyzed the evaluation model of ICT in education, designed an evaluation system...
With the rapid development of Internet and information technology, information literacy has become an essential skill in the information society. China pays great attention to the development of information literacy of primary and secondary students. Nowadays, many countries have developed authoritative assessment scale, however, most of them only use it as a testing tool but fail to have real effects...
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