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The stability of interconnected large power systems — like the Brazilian National Grid (SIN) — is directly compromised by weakly or not damped low frequency oscillations and transitory oscillations, these latter originated from large contingencies. In order to identify and control the system oscillation modes efficiently, the dynamic behavior of various wide areas, it becomes necessary synchrophasor...
Under the action of a strong earthquake, pier aqueduct structure is prone to injuries in the pier damage, making the whole structural seismic performance significantly reduced. Based on the concrete plastic damage constitutive model, a large gravity pier aqueduct structure is analyzed in the law of dynamic response under the action of earthquake. Compared with linear structure, the aseismic characteristics...
The article analysis the deformation of soft rock tunnel surrounding rock under different excavation methods by numerical simulation, and provide excavation and supporting design scheme proposed for soft rock section. The supporting scheme is reasonable and feasible through monitoring data verification. It provides technical guidance and theoretical basis for the construction of similar soft tunnel...
To solve the ground subsidence phenomenon that occurs in the subway construction in soft rock region, in this paper, we shore the soft rock strata by deploying deep hole grouting technique. The dynamic monitoring data show that, by deploying deep hole grouting technology in subway tunnel construction in soft rock strata, the surface subsidence value is always in control.
This paper studies the stress distribution of tunnel support, the mechnical behavior of the bedding jointed rock mass was analyzed. The influence to the lining structure was also analyzed. According to the calculations of FLAC3D, the numerical modelling analysised the prejudical pressure of the lining structure. On the basis of the analysis of the test data, it showed the characteristics of the earth...
In order to completely satisfy the requirements of the loess foundation pit engineering and achieve the same effect with anchor cable support. Self-tapping precession-type soil anchor bolt is a new-type spiral tension member. Through the study of its mechanical transmission mechanism, the mounting torque of the anchor bolt is deduced. And the feasibility of anchor bolt support in loess foundation...
The development of mobile internet brings a new perspective for user interest model. Mobile logs record more behaviors which can build a more comprehensive model for personalized service or recommendation system. Comparing the VSM and semantic network, we choose Concept Hierarchy to model user interest considering hierarchical granularity relations and make the user interest vivid and clear. In the...
The smoke detection in remote video surveillance is of great importance in forest fire prevention since smoke usually appears before fire. In order to solve this problem, we proposed a novel smoke detection algorithm based on fast self-tuning background subtraction segmentation and judgments of smoke analysis. First, a self-tuning background algorithm is utilized on the source image to segment the...
With the rapid development of digital technology and information technology, high definition and documented producing and broadcasting has become a main direction in development of television program. This paper analyzed the disadvantages of the traditional media asset management mode based on tape, and made an exploration on a media asset management mode based on documented producing and broadcasting...
It is indispensable for electric power companies to classify the electricity consumption behavior of residential customers, in order to understand the user's personalized demands and provide them with targeted services. K-means Clustering algorithm is one of the most popular methods for grouping the consumption patterns in previous studies. However, in traditional K-means algorithm, the initial clustering...
Aiming at the problem of energy shortage and energy efficiency to be promoted, considering the importance of intelligent park to promote energy conservation and emission reduction, this paper analyzed the structure of multi-level energy transfer model of intelligent park. Firstly construct the structure of multi-level energy transfer model of intelligent park, and the structure including energy input,...
As ITRS predicted, the diameter of the through silicon via (TSV) would reduce to 1.6 µm by 2015, and the size of TSV interconnection will fall to the range of 10 µm or less, and thus micro-bumps will contain only a few crystal with such a dimension. Because Sn has relatively the high creep resistant and moderate melting point, it is appropriated to be applied in TSV interconnection. This paper investigates...
In this paper, a perceptual-based fusion method for infrared and visual images is proposed. Many methods based on gradient and energy have been used in the literature, but these methods are not considered the human visual system (HVS) and their experiment results are less than ideal. So a method depending on contrast sensitivity function (CSF) based on the respond of HVS as a criteria to determine...
This paper focuses on realizing the full potential in efficiency of dual-motor electric vehicles by exploring control strategies of driving force split and driving-mode. First, the minimizing power loss is set as the target of optimization and the method of driving force split between the front and rear axles is established. Then an adaptive decision control system is designed by fuzzy logic to realize...
Construction of urban metro will be the development tendency of underground project in the future. The key to determining the quality of metro construction is construction of shallow tunneling and subsurface excavation in the stratum filled with established buildings. It is of great academic application value to study the quality control and deformation rule of the metro construction under the established...
As to the issue of precious velocity measurement, micro-Doppler model of cooperative target was established. First, launch coordinate system was introduced to discuss conveniently. Second, two models of micro-Doppler of cooperative target were deduced. Under the condition of receiving with PLL and transponder of frequency converting, monostatic model of micro-Doppler of cooperative target was derivate...
This paper aims to provide a more convenient interaction approach for users who can manipulate or build his pleasurable car model by adjusting semantic properties. Since specific aesthetic property is determined by semantic key lines, adjusting these lines obeying particular curve styling property will manipulate car model semantically. An interface is designed to change styling properties with modification...
To study iron loss distribution characteristics in stator and rotor cores of cage induction motors, this paper establishes a computational model, with skew rotor bars considered, based on Time-Stepping Finite Elements Method (T-S FEM). Taking a 5.5kW cage induction motor as an example, time variations and loci of the flux density at different core locations is analyzed with no-load and full-load conditions,...
Accurate object segmentation remains a significant procedure in computer vision tasks. In this paper we propose a novel object segmentation method which based on region fusion and grab-cut. In the preprocessing stage, we segment the input image into superpixels as processing units. Then, we use a graph structure to model the superpixels and their correlations. To achieve the goal of region fusion,...
An efficient model-based bit allocation algorithm, in this paper, is proposed for quality scalability coding of H.264/scalable video coding (SVC). The conventional Rate-Distortion models are not available for quality scalability coding of H.264/SVC. To overcome this issue, the relationship between the percentage of header bits and quantization parameter is investigated to obtain an accurate single...
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