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We propose a simple, yet powerful regularization technique that can be used to significantly improve both the pairwise and triplet losses in learning local feature descriptors. The idea is that in order to fully utilize the expressive power of the descriptor space, good local feature descriptors should be sufficiently “spread-out” over the space. In this work, we propose a regularization term to maximize...
This paper aims to investigate problems of multivariable controller design for Aeroengine. A design method of model reference adaptive control system was established based on the theory of super stability. By ensuring the global stability and asymptotic stability of the system, the adaptive controller of aeroengine was carried out by using this method. The tracking performance, anti-interference ability...
We present an automatic method for extracting the geologic features of gravity and magnetic anomaly bodies. Combining the curvature, analytic signal and upward continuation processing together, we present a depth-estimation method for interpretation of sources. The method only uses the first derivatives of the gravity or magnetic anomaly reducing to the pole, which is insensitive to noise and has...
Extreme learning machine (ELM) is a fast online learning algorithm for single hidden layer feed-forward neural networks (SLFN), which keeps the fast learning speed with good performance. And it has been widely used on function approximation and prediction classification. However, the parameters in hidden layer of ELM are randomly determined which leads to the unstable prediction performance. So the...
Drain drainage design and calculation program is to conduct a series of work on the basis of completion of network routing design and calculation. There are some differences in design method between water pipes and storm sewer drainage system. The program is a bit different, but a large number of constraint condition and control methods are basically the same.
To improve the performance of the missile interceptors against modern air-defense threats such as ballistic missiles, a new integrated missile guidance and control with sliding mode differentiator and neural network algorithm is proposed in this paper. The three dimensional target and missile relative kinematics are firstly established based on which the zeroing line-of-sight (LOS) angular velocity...
Performance-based contracting (PBL), as a novel approach, is replacing traditional service procurement practices. In this paper, we set up a closed-loop support system for repairable parts with an M/M/m/N queuing service facility and a spare parts warehouse. We derived the steady-state probability of inventory levels in warehouse and the performance measures of the support system. Under the performance-based...
Based on the chaos anti-control theory, a new Lorenz hyper chaotic system family is proposed by adding a linear controller to the three dimensional autonomous Lorenz system family in this paper. It has been verified that the systems in the newly proposed family have the possibility of hyper chaos by analyzing their symmetry, dissipation, the stability of their equilibrium points, as well as the Lyapunov...
The subthreshold circuit is a promising ultra-low-power solution for such applications that don't require high speed but are extremely power-stringent. The characteristic of the current under subthreshold voltage is different from the normal domain. A delay model is essential to predict the performance, analyze the variation impacts and optimize the design. This paper proposes a fast computable delay...
To optimize the utility boiler' s combustion process, a method for its combustion performance modeling based on modular Redial Basis Function(RBF) Neural Network is proposed in this paper. The whole modeling can be divided into two stages: first, get the mathematical model of carbon content of fly ash, exhaust flue gas temperature and their related input parameters; second, take the output of Neural...
A research method of the throttle aperture when annular slice deformation is presented. The flow equation of aperture under the turbulence state is deduced using the boundary layer theory. The equivalent relation of the flow is deduced according to the system structure which is designed by independence. The flow coefficient of controllable valve is solved by least squares method under the different...
The paper firstly briefly introduces the remote sensing investigation in vegetation and wetlands, preprocessing procedure of remote sensing image in the natural resources monitoring, and the commonly-used extraction methods of wetland vegetation information. In addition, the paper discusses the research status of the remote sensing inversion model, and elaborates on the three commonly-used models:...
According to the TOP model theory, taking one tunnel as an example, the environmental effect of pollutant diffusion from tunnel portal is analyzed. The research findings show that the concentration of pollutants is beyond the ambient air quality standards in a certain region near the tunnel portal, when all of the waste gas discharges from portal without from shaft. The concentration of pollutants...
It makes a brief description of the forms and main parameters of the β Stirling engine with the rhombic drive mechanism. The paper makes a deep analysis and found mathematical models on the cycle performance of β Stirling engine, illustrates the mathematical relationship among the power, pressure, working fluid volume, temperature and efficiency. It makes an experimental prototype design which through...
The purpose of this study is to seek a new stimulus pattern, which stimulates pudendal nerve efficiently and reduces electrochemical damage, by means of investigating its influence on abolishing detrusor hyperreflexic contraction in bladder reflex pathway. For studying the mechanism of nerve conduction, a simulation system was built based on Frankenhaeuser-Huxley (FH) equations. With this system,...
After many years of silence, virtualization recently became a hot topic once again, especially in the field of system dependability. Current researches mostly focus on more technical methods without taking into account the problem of how to verify the dependability of these technics. This paper proposes a Markov model to describe virtualization systems and gives the solving methods to quantitatively...
Frequency evaluation is an important but time-consuming task for power system operation. Conventional frequency response analysis methods were not suitable for fast frequency evaluation (FFE) due to their weakness in heavy computation load or poor accuracy. A new direct current loadflow based power system frequency response analysis method (DFR) for FFE was proposed in this paper. It reduced complexity...
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