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In the field of video-based fire detection, traditional fire color models have poor adaptability and susceptibleness to environmental interference. As fire can be divided into fire core, inner fire and outer fire layers depending on its temperature and color, a new fire detection model based on dispersion of fire color components has been proposed by the author. In order to further reduce false alarm,...
According to the feature of DC superposition theory which is applied widely in monitoring the insulation condition of power cable with cross-linked polyethylene insulation (XLPE), such as high precision but time-consuming, so a quick positive and negative DC superposition monitoring method is presented in this paper. In which the Positive and negative DC voltages are injected to detection circuit...
In the field of video fire detection, traditional fire color models have the poor adaptability and week robustness to interference. As fire can be divided into fire core, inner fire and outer fire areas depending on it's temperature and color, a new fire recognition model referring to the dispersion of fire color components is proposed in this paper. The threshold of B component standard deviation...
DC micro-grid has a number of distributed energy resources and a large number of constant power loads. They are prone to oscillate, bringing hidden hazards to the stable operation of DC micro-grid. With the example of two-source and two-load cascade system coupling, this paper discusses about one strategy to inhibit DC micro-grid oscillation. The strategy is to introduce the heterogeneity coefficient...
This paper presents an effective method based on support vector machines for identification of power system disturbances. Because of its advantages in nonlinear systems applications, phase space reconstruction is used to extract the distinctive features of the voltage signals. Eighteen particular disturbance signals are selected and then analyzed using this tools. Phase space reconstruction and support...
In this paper, the shape features of different material of flame and interference image in video fire detection were analyzed and compared. The area, perimeter, rotundity, solidity, extent, sharp corners, similarity and centroid displacement are selected as the candidate features. After analyzing and excluding area and perimeter as these candidate features, weak classifiers of six other shape features...
Obstacle detection is a key technology of intelligent transportation and autonomous robot navigation. Aiming at the shortages of traditional obstacle detection technologies, the paper applies the Kinect depth camera as the sensor of obstacle detection system, and an obstacle detection method based on Kinect depth image is proposed on the theoretical basis of Kinect real-time 3D reconstruction and...
With the wide application of power electronic equipment, more and more attention has been paid to the power quality of power supply system. For three-phase/switch VIENNA rectifier with a high power factor, one cycle control is a reliable and simple non-linear large signal control method. For the design of VIENNA rectifier, the balance of dc-link neutral-point voltage is important, especially when...
The hardware implementation scheme and software processing flow of IEEE1588 clock synchronization techniques in the Ship Power Synchronized Phasor Measurement(SPSPM) was discussed in this paper. The technology of Frequency compensated clock was adopted as Frequency self-compensation scheme for the problem that Clock drift deviation expand gradually in the synchronization interval. The scheme was test...
About the research of fire flame segmentation, the edge growth segmentation arithmetic proposed in the article uses HSI color vector as growth seed. This method makes full used of color images' color and space characteristics, it uses color's comparability of region color mean to confirm the edge pixels. According to the principle of region growth and border tracking, a close border line is shaped...
An analysis method of circulating current in parallel SPWM inverter system for AC motor drive is proposed based on double Fourier Transform theory in this paper. The models of driving current and circulating current are constructed by voltage equations of inverters and motor load. The characteristic of circulating current is analyzed by using the modulating equations under the condition that the triangular...
In order to reduce false alarm and alarm failure of fire detection system, a research of fire detection method based on multi-sensor data fusion was conducted. In this research, probabilistic neural networks (PNN) data fusion algorithm was employed to detect fire based on texture features from fire scene. Information of temperature and smoke concentration were processed by trend algorithm separately...
Package is a critical part in biomedical implantable systems. Many factors affecting the host body and the life time of implantable systems need to be considered. Package becomes more critical for microfabricated systems with wireless charging and communication. This paper presents the first phase study on micro package techniques for short term (30 to 90 days) implantable systems. A MEMS implantable...
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