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In this paper, we propose a novel automatic traffic sign detection and recognition method. Detection is based on a boosted detectors cascade, trained with a novel evolutionary version of Adaboost. Segmentation is implemented by the improved Grab cut via the detection information. Classification is defined as a multiclass categorization problem, which is solved by HOG feature and support vector machine...
This paper presents a face registration method and a surgical instrument tracking method for Image-guided Surgical Navigation System (ISNS). In ISNS, we start the process by reconstructing 3d point cloud of patient using a proactive structured light visual system and then accurately complete face registration based on Iterative Closest Point (ICP) algorithm. We utilize special markers to represent...
Injecting negative sequence current into the grid can improve the operating performance of grid-connected voltage source converters under unbalanced grid voltage conditions. In this paper, a dual sequence current control scheme was proposed to quickly track positive- and negative-sequence sinusoidal currents with zero steady state error, implemented in double synchronous reference frames and without...
The Five-Level Active-Neutral-Point-Clamped (5L-ANPC) inverter is one of the most popular topologies among five-level inverters since it combines the features of Flying-Capacitor (FC) type and Neutral-Point-Clamped (NPC) type inverters and was commercially used for industrial applications. This paper proposes a novel modulation strategy for a Six-Switch 5L-ANPC (6S-5L-ANPC) topology to keep voltages...
Multi-cell diode-capacitor/inductor based boost derived DC-DC converter provides a simple solution for high step-up voltage regulation in solar and fuel cell generation. However, many passive components increase the order of system model and complexity. Transient modeling analysis reveals that time constant of each component in diode-capacitor/inductor network is much smaller than that of other circuit...
This paper presents a solution which combines the historical experience with ranking metrics anomaly to achieve fault diagnosis and localization in distributed information systems. Since a large portion of system failures are repeated ones, we can use past experiences by storing historical failures in a database and complete similar search and localization when fault occurs. We extract the system...
Cat swarm optimization (CSO) is one of the most known bio-inspired algorithms and is generated by the rule of cats' behaviors. Previous research shows the CSO algorithm performace better on finding the best global solutions than other two heuristic optimization algorithms: Particle Swarm Optimization (PSO) and weighted-PSO. The fractional calculus (FC) concept is proposed in this paper for controlling...
Considering the locality feature of voltage control problems, This paper proposes a coordinated voltage control method with tiered weight coefficients of optimization targets, the optimization problem is formulated and solved based on the model predictive control method. At the initial control time, the correlation degree between buses is obtained based on the dynamic voltage response feature and...
The accuracy of wind plant power control strategy is the key to ensure the adaptability of the wind plant. Effective testing and verification are essential means for the correctness of the control strategy. In this paper, the principle of active and reactive power control system for wind plant is studied firstly, the implementation architecture of power control system of wind plant is analyzed then,...
ShapeNets is an image representation, which is based on shape, compact structure, hierarchical image structure and appearance characteristic of object contour. In a ShapeNets, the shape of image is a window of containing objects which can be extracted with the method of objectness. The outline of objects can also be extracted in a line boundary detection algorithm based on histogram of gradients direction,...
Battery packs have been widely used as the power source in many fields, such as pure or hybrid electric vehicles, because of the advantages of high energy density, long cycle life, low self-discharge rate, no memory effect and so on. The heat dissipation is a key issue in the reliability of the batteries, especially for high power applications. Paraffin waxes are commonly used phase change materials...
In cyber situation awareness, top-down simulation for group behaviors of attacks are unsupported to simulate unknown cliques of attackers. To solve this issue, we believe that hierarchical group behaviors as an abstract data type (ADT) can be agglomerated by other behavior types, such as individual and subgroup behaviors with a bottom-up way. In this paper, we propose a hierarchical clustering algorithm...
In order to enhance safety of extended black-start schemes during the actual restoration process, the safety factors that affect the restoration process are incorporated into the optimization objective set. Considering the leader-follower logical relationship of generator restoration to path restoration, a novel bi-level programming model for extended black-start scheme optimization is established...
In this work, we report our recent progress on monolithic integration of magneto-optical oxide thin films and nonreciprocal photonic devices on silicon. We demonstrate strong Faraday rotation of − 6000 deg/cm at 1550 nm wavelength in silicon integrated Ce1.5Y1.5Fe5O12 films, which exceeds the Faraday rotation of epitaxial CeiY2Fe5Oi2 thin films on garnet substrates. We also present the design of a...
An optical fiber refractive index sensor with six detection ranges is realized by integrating six microfibers surface plasmon resonance (SPR) sensors on the facet of seven-core optical fiber via the 3D micro- and nanoarchitectures fabrication technology of two-photon lithography. Although optical fiber SPR sensors show advantages of miniaturization, lightweight, flexibility and high sensitivity, their...
Tiny tips of optical fibers are actually expansive platforms for micro- and nanotechnologies, based on which various micro- and nanoarchitectures made of dielectric or metal materials could be built with different fabrication technologies for special applications, such as refractive index, surface enhanced Raman scattering (SERS), pressure and temperature sensing. As for sensors, optical fibers are...
To accomplish accurate injection, the attitude control system of launch vehicle must precisely control the attitude angles. However, the attitude control problem for launch vehicle is challenging because of the elastic properties. To improve the attitude control performance, a new attitude controller design method is developed based on parameter optimization. First, the controller model is established,...
In this paper, near-field antenna probe is designed for propagating spin wave spectroscopy (PSWS) measurement. We compare the meander-line and straight-line antenna probes. Effect of the dimension parameters of antenna probe on scattering parameter is investigated. Near-field distribution and radiation pattern of these two kinds of antenna probe are discussed. Also, the placement of antenna probe...
In geosynchronous (GEO) synthetic aperture radar (SAR), the high orbit height and the long integration time would lead to the significant round-trip delay time and the curved flight path, thus the traditional range model with ‘stop-go’ assumption will be ineffective. In this Paper, based on the analysis of instantaneous Doppler frequency of GEO SAR, an equivalent midpoint mathematical model is proposed...
The style of clothing is complex and changeable, there are many kinds of clothing styles, different styles have different emotional expression, but the current description of clothing emotions is mostly qualitative characterization, and the words to express which have no systemic analysis until now. To establish the clothing semantic emotions space is the important prerequisite for computer recognition...
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