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A concept of hierarchical topic is proposed for multi-document automatic summarization task, which used multi-layer topic tree structure to represent the text set. Each node in the topic tree represent specific topic and contains multiple similar sentences in the text set. The hierarchical topic structure may describe accurately the similarity between sentences at different levels of granularity....
In this paper we propose a new viscosity approximation scheme for computing fixed points of asymptotically nonexpansive mappings in Banach spaces. Strong convergence theorem is established under some certain different control conditions of the viscosity methods for asymptotically nonexpansive mappings, and some recent results are improved and generalized.
For more efficient use of wireless sensor networks, the article using the Bayesian formula to revise the subjective weights base on the fuzzy multiple attribute decision making (MADMR) of WSN routing algorithm which making the subjective weight more theoretical, at the same time using the entropy coefficient model to avoid too much deviation with the objective weights. The simulation results show...
Precision Agriculture Monitor System (PAMS) is an intelligent system which can monitor the agricultural environments of crops and provides service to farmers. PAMS based on the wireless sensor network (WSN) technique attracts increasing attention in recent years. The purpose of such systems is to improve the outputs of crops by means of managing and monitoring the growth period. This paper presents...
An evolution-immunity principle in dynamic miming process has been shown. Then a framework for evolution immune integration with fuzzy tacking is designed. A robust coordinator is used to set the robust index and dynamically evaluate the evolution in order to solve the problems such as degeneration, missing optimum and local optimum. An algorithm for Web mining based on the framework is feasible and...
The three control parameters of PID interact and have a more complex relationship with control index, so the PID parameters tuning is more difficult. According to the Principle of expand response curves, through the theoretical analysising and the simulation verifying, it is found that the three control parameters tuning of PID can change into the single parameter KP tuning, there are the simple correspondence...
The new intelligent control terminal of solar street light was carried out in this paper. It combines of current general street light charge and discharge management controller and wireless communication technology. It employs fuzzy control theory to control the uncertain system to achieve reasonable battery charge or discharge. The terminal has the feature of running on the network and off the network...
Based on multi-sensor information and the D-S Data Fusion Algorithm, the presented system enables a robot to plan paths by itself and avoid obstacles by providing sufficient and reliable information regarding its surroundings, so the robot can approach its target eventually. A master-slave control system is adopted as the control system. Laser sensors, ultrasonic sensors, infrared sensors, photo sensors,...
In this paper, aiming at the shortcoming of trust region method, we propose an algorithm using negative curvature direction as its searching direction. The convergence of the algorithm is given. Furthermore, combining trust region method and curve-linear searching techniques, using general curve-linear searching direction a trust region algorithm is proposed. We proved its efficiency and feasibility...
In this paper, the finite-time stable control problem for the chaotic system of permanent magnet synchronous motor is studied. An active control method with dynamic active compensation is proposed, which makes the closed-loop system achieve approximately finite-time stable control. And a new observer is designed to solve the uncertainty. The approximate finite-time stability of the closed-loop system...
This paper studies the control for synchronization of a four-dimensional system via a single variable, and a linear feedback controller and an adaptive controller are proposed. Based on the Lyapunov stability theory, the correctness of the proposed methods are strictly demonstrated. The numerical simulations further show the effectiveness of them.
In this paper, the performance of the traditional linear current-loop strategy of a single-point Electromagnetic suspension system is analyzed and its disadvantages in application is pointed out. It is concluded that the time constant of the resultant voltage-current subsystem varies as the changes of the suspension states, which will destroy the condition of implementing model reduction by the method...
In this paper we use L1 adaptive controller to augment a baseline for improved command tracking of the unmanned aerial vehicle. The procedure included baseline and adaptive augmentation controllers design. The eigenstructure assignment (EA) controller was designed for the nominal case, and then was augmented with a L1 adaptive controller. The L1 adaptive control methodology offered an adaptive contributor...
The problem of multiple equilibrium points caused by fixed-current levitation control was researched in this paper. Mathematic model of hybrid maglev system with permanent added into suspension magnet was established at first. The contacted force and electromagnetic force between magnet and guide way were expressed separately. Then fixed-current controller based on proportional-integral-differential...
Introduce a short stroke precision stage which is Droven by the linear AC servo motor. We build the mathematical model of the linear motor and the servo control system. The PID controller of the linear AC servo system is designed by partial model matching method. Parameters analysis and experiments are done. The results shows that this model has good positioning accuracy, good dynamic performance...
Firstly, a sub-band energy threshold entropy was proposed as information measurement cost function. Then a novel best wavelet packet power measurement algorithm was proposed, which can decompose power signals into sub-bands adaptively according to the energy distribution, meanwhile, this algorithm can perform the decomposition of power energy in one wavelet packet process. The simulation using db40...
In this paper the synchronization problem of two identical Chen chaotic systems is studied and the design of a sliding mode controller is presented. Firstly, we directly make master-slave Chen chaotic systems satisfy stability in the Lyapunov sense. Secondly, we propose a sliding mode controller to synchronize the Chen chaotic systems. Simulation results show the effectiveness of the proposed method...
By detecting the nutrient elements contents in soil for monitoring the rice growth and conditions of nutrients, a month after fertilization N, P, K and no fertilization in paddy soil have been analyzed by laser induced breakdown spectroscopy (LIBS) technique, which is using a Nd: YAG ns laser at 1064 nm and an eight-channel AvaSpec spectrometer with CCD detector. The characteristic spectra and the...
In accordance with the characteristics of aviation industry system, this paper put forward the study methods of coordinated development of civil aviation industry by large scale system cybernetics from macro, medium and micro layer, in order to reveal the key factors and internal relationship amony civil aviation transport industry, civil aviation manufacture industry and civil aviation service industry...
According to the characteristics of long-span continuous rigid frame bridges, this paper constructs a bridge intelligent control and safety warning system. By analyses on the mechanical properties of the continuous rigid frame bridges in operation, choosing the key control sections and parameters, it can get dynamic monitoring data from reliable data acquisition systems and data transmission system,...
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