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In a n-machine power system, there are n-1 low frequency oscillation modes and corresponding n-1 low frequency oscillation mode shapes. Frequencies of these modes are distributed in a small range of 0.2-3.0 Hz, thus close modes may occur. This paper first analyzes sensitivity of low frequency oscillation close mode shapes to small change of system parameters, points out the instability of close mode...
Power quality interference sources generate a large number of harmonics and negative-sequence current into power grid in the process of using electricity. Harmonics and negative-sequence current not only affect power grid's safety and economical operation also cause interference to other normal users, which brings large threat and danger to the power grid and users. As an effective method to prevent...
For continuous applications of distributed power, such as photovoltaic power and wind power and so on, power quality of public distribution network faced more uncertain factors, performance of power quality compensation equipments in distribution network like shunt hybrid active power filter (SHAPF) also suffered from some negative influences of distributed power, so their control strategies were...
The current image inpainting algorithm based on structure, TV (total variation) algorithm is commonly used, and result is better. But TV algorithm is too slow, this paper presents a fast algorithm to repair. The algorithm first points of the neighboring weighted sort, and then restoration of damaged areas with the right value of the weight. The experimental results also show that the algorithm is...
To test the hypothesis that concentration polarization of atherogenic lipids may occur in the arterial system and probe the effect of endothelial cells (ECs). A modifier with local stenosis was developed. The luminal surface LDL concentration at the distal of stenosis was analyzed with numerical stimulation and was measured by confocal microscopy. ECs were incubated with low density lipoprotein(LDL)...
Knowledge sharing among the supply chain’s constituents can be effective to promote supply chain coordination. This paper we present our work on ontology based on SCOR and analysis rules of supply chain. And then an issue of decision-making for supplier selection is researched by inference. Finally a coordination model based on ontology and rules is developed. As the ontology is a standard, explicit...
Although many literatures are available on diffusion and adoption of mobile commerce, the topic is still under development and offers potential opportunities for further research and applications. This paper reviews the literature on diffusion and adoption of m-commerce. The paper points out the current problems in the study and provides a source of idea for the understanding of the key factors for...
The simulation software developed by C++ Build language based on activated sludge model 2d (ASM2d) was carried out to address the effects of dissolved oxygen (DO) on the behavior of biological nutrient removal in a sequencing batch reactor (SBR) system. Changes of COD, nitrogen and phosphorus concentrations could be reliably predicted according to the time arrangement of every phase adapted to the...
The concepts of average path length, clustering coefficient and degree distribution were firstly introduced into knowledge cooperation networks, and the property of complex network mapping from knowledge cooperation networks was studied. The Wiki network of baidu-baike was demonstrated as an example, and the topology of knowledge cooperation networks was compared with World Wide Web, Internet and...
Lung cancer is one of the deadly and most common diseases in the world. Many methods have been proposed to avoid radiologists fail to diagnose small pulmonary nodules. Recently, support vector machines (SVMs) had received an increasing attention for pattern recognition. We present a computerized system aimed at pulmonary nodules detection; it identifies the lung field, extracts a set of candidate...
The three-dimensional (3-D) ultrasound stereo visualization technique has a broad promising future for its ability superior to traditional two-dimensional (2-D) ultrasound image, and it helps to understand the complex structures of tissues as well as to measure tissular volumes. However, it is often difficult to interpret the 3-D structure from acoustic data because of the speckle noise. To solve...
In this paper, we study the global disturbance rejection problem of nonlinear systems in lower triangular form with unknown exosystem. Solvability conditions are established first. Then the convergence problem of an estimated unknown parameter vector to the true parameter vector is discussed. Finally, the theoretical result is applied to solve the disturbance rejection problem of the controlled uncertain...
Two problems in multi-attribute group decision process are studied: integration of multi-types of preference information and making use of given decisions. And a GDSS model based on rough set is proposed, which includes seven common ways for representing preference information. An improved Sem Naive Scaler Algorithm is also suggested to decentralize the information in the rough set table. Finally,...
In the signal processing, the theories and methods, such as optimization, auto-adaptive, high resolution and multi-dimension, is become systematic. We are looking forward to higher research. Many people are focusing on the signal of non-stationary, non-Guassian, non-minimum phase, nonlinear system and so on. As a result, the method of the analysis is changed from time analysis and frequency analysis...
Based on Horner' rule and Baugh-Wooley algorithm, this paper presents two novel bit-level parallel array algorithms of 2's complement multiplication, and the algorithms have been mapped to systolic arrays by using linear mapping techniques. We propose two efficient systolic arrays of multiply and accumulate (MAC) operation and we also describe the vector-vector and matrix-matrix multiplication that...
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