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Satellite-borne rectangular waveguides operate in a high vacuum space environment and also under high RF power. Both these conditions favour the initiation of the multipactor breakdown, a phenomenon that limits greatly the output power of any communication satellite. Multipactor breakdown or multipactor inside RF equipment may be caused by a primary electron accelerated by an electric RF field which...
This paper considers the current domestic and international air-conditioning control and temperature characteristics of the respective physical parameters of large inertia and time delay of the characteristics of central air conditioning system on thermal engineering modeling, and the establishment of air-conditioned room and a temperature control valve circuit mathematical model. The Matlab simulation...
In order to solve the problem with being easily trapped in a local optimum of back propagation neural network (BPNN) and the premature convergence based on standard genetic algorithm (SGA), a dynamic and adaptive model which combines the modified genetic algorithm (MGA) with BPNN is proposed in this paper. By introducing modified genetic operators and dynamic mutation probability measure, the MGA-BP...
This paper presents a comparison of language aspects in a model and a meta-model. The motivation is to get a better understanding of how we should define a modeling language.
Grid computing system is the one where individual entities share their resources with others in their own domain as well as with other domain. The resources should be shared with out loosing individual's confidentiality and control over their resources. The resources must be selected in such a way to achieve this and at the same time grid security also must be ensured. Various models have been proposed...
In this paper, we present a conformal mapping-based deformation method which is well suited to sculpt the solid models globally. There are two characters of the method proposed. First, due to the properties of conformal mapping, the scheme satisfies the local demands on rigidity and still allows for considerable global deformation. Second, the deformation effect is predictable and the transformation...
From economic angle consideration is the concession between two parties in contradiction when economic conflicts arise among two or above equal Based on consideration theory, this paper formulates a reasonable and unitive consideration standard out of consideration for various parties' interest.
This paper presents a Takagi-Sugeno (T-S) model based fuzzy control design approach for rigid satellite attitude maneuver. The T-S fuzzy model is first applied to represent the rigid satellite model consists of dynamic and kinematics equation. Then, a fuzzy state feedback controller is designed for the obtained T-S fuzzy model with considering the decay rate by using the parallel distributed compensation...
A fresh air system with solar collectors and Latent Heat Thermal Storage (LHTS) tank filled with Phase Change Material was firstly introduced in this paper. For the mathematical model of the fresh air system is difficult to accurately establish, the adaptive neuro-fuzzy inference controller was proposed to realize the parameter identifications of the system applying for the back-propagation algorithm...
One of the biggest challenges in restoring historical documents is to achieve a high level of OCR accuracy. The main characteristic inherent to these valuable but degraded documents is the abundant presence of broken characters. This paper represents this problem as a mathematical model. We also propose a novel solution based on set-partitions to recognize broken characters in Thai Historical documents...
Antenna look angles of geostationary communications satellite provide the information required to ensure that control station antenna is directed towards the satellite; more specifically to ensure that the main lobe of the antenna is aligned with the main lobe of the satellite's antenna, and to ensure that the largest amount of energy is captured from the satellite. To optimize the performance of...
Water consumption of plants is a key parameter for formulating irrigation system, and the precise prediction play a important role in improving the use efficiency of limited water resources. In this experiment, by using the method of artificial neural network and MATLAB DATA PROCESSING SYSTEM combined with the meteorological data of air temperature, relative air humidity, solar radiation, wind speed,...
The conventional PID control based on precise mathematical model is difficult to guarantee heating process requirements because the heat treatment furnace with large inertia and time delay of nonlinear and time-varying characteristics. Designed the heating furnace fuzzy control system based on PIC16F877 MCU with the functions of data acquisition, furnace temperature control and fault detection. The...
A wireless sensor node is often powered by battery which is not easily replaced, so researching how to use its limited energy effectively is the meaningful thing for wireless sensor networks (WSNs). Dynamic voltage scaling (DVS) has become a promising way for wireless sensor networks to exploit multiple voltage and frequency levels and prolong the sensor node's life. However, pure DVS for embedded...
Unified Modeling Language (UML) provided effective means for aspect-oriented modeling, among which UML state machine was designed to model for the dynamic behavior of the system. UML state machine, however, failed to explicitly support the modeling of a crosscutting feature. The paper, based on UML extension methods, firstly set up state class in supported aspect from level of state machine meta-model,...
Many electronic drivers for the induction motor control are based on sensorless technologies. This paper proposes a novel hybrid motion sensorless control system to solve the low speed problems using MRAS and NN estimation scheme which is based on rotor flux. A multilayer feedforward artificial neural network is proposed for rotor flux estimation which is more robust to noise and stator resistance...
This paper addresses a regularized deconvolution technique used on image restoration by an iterative Topkis-Voinott approach. In order to suppress background noise during restoration, a Lagrange parameter is introduced for regularizing the deconvolution produces. A mathematics model is described in this paper and the artificial and real microscope restored images are compared to other algorithms with...
In this paper a new method is designed to account price of military software, which is based on option pricing models. Firstly, it is introduced about the basic knowledge of option pricing model. And then the military software pricing model is provided based on Black-Scholes option model and binomial tree model. Several variables in reference to military software price are redefined in the related...
A difficult class of problems is the class of combinatorial optimization problems. This is because the search space of such problems is often grown exponentially when the size of the problem grows. There are some known solving techniques to tackle such problems of which the most popular ones are: mathematical methods, constraint programming and local search. Each technique has its own advantages and...
A hardware in loop simulation(HILS) for vehicle controller used in hybrid electric vehicle(HEV) has done. The simulation results shown the HIL real-time simulation can exactly monitor the performance of vehicle and greatly decrease the development cycle and the cost of vehicle controller.
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