The creep rupture life of Ni-base superalloy was investigated by the bp algorithm based on ANN method. The model of relation among different temperatures, external stress and creep rupture life of the alloy with diffe...
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The creep rupture life of Ni-base superalloy was investigated by the bp algorithm based on ANN method. The model of relation among different temperatures, external stress and creep rupture life of the alloy with different compositions was developed. The simulation for creep rupture life of the alloy was conducted through net training. The simulated results was well in agreement with the measured ones. It shows that ANN method is an available and efficient way to predict the Ni-base superalloy's creep rupture life.
The system uses nRF2401 for short-range wireless communications, GPRS for long-distance wireless communications, ARM9 for center console, Wireless Multi-sensor Fire Detector for node, and bp algorithm is used for ...
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ISBN:
(纸本)9781424438631;9781424438624
The system uses nRF2401 for short-range wireless communications, GPRS for long-distance wireless communications, ARM9 for center console, Wireless Multi-sensor Fire Detector for node, and bp algorithm is used for judging the probability of fire. Wireless Multi-sensor Fire Detector is formed of the low-power electrochemical carbon monoxide sensor, photoelectric smoke detector and semiconductor temperature sensor. bp algorithm program is embedded in the S3C2440A ARM. The samples of bp algorithm were derived from the fire detection standard room of the State Key Laboratory of Fire Science of China. Center console uses Em GlS(embedded GIS) to show where the fire break out and uses GPRS to transmit SMS to the fire command center. The system is low false alarm rate, low cost, fast response and convenient to install.
The Luby Transform（LT） codes have been suggested as an efficient solution for multimedia communications over erasure packet network,and provide equal error protection（EEP） for all input ***,for the progressive ima...
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ISBN:
(纸本)9781467356985
The Luby Transform（LT） codes have been suggested as an efficient solution for multimedia communications over erasure packet network,and provide equal error protection（EEP） for all input ***,for the progressive image transmission,the significant source bits are generally located ahead of the bit streams of the encoder output,which are more important for the reconstruction of the ***,the LT codes based on EEP（EEP-LT） scheme is not suitable for the progressive image *** the paper,based on the LT codes,a novel unequal error protection（UEP） scheme is proposed for image transmission over multiple input multiple output（MIMO） channels,which is named UEP-LT *** results confirm the efficiency of the proposed scheme.
Considering the limitation such as premature convergence and low local convergence speed of genetic algorithm, some improvements were made for classical genetic algorithm. Firstly, a help operator was used to help ind...
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Considering the limitation such as premature convergence and low local convergence speed of genetic algorithm, some improvements were made for classical genetic algorithm. Firstly, a help operator was used to help individuals of population according to the given probability. Secondly, the genetic individuals were separated into male individuals and female individuals, and consanguinity was fused into individuals. Two individuals with different sex could reproduce the next generation only if they were distant consanguinity individuals. Based on this improved genetic algorithm, an evolved neural network algorithm named IGA-bp algorithm was proposed. In this algorithm, genetic algorithm was used to optimize and design the structure, the initial weights and thresholds, the training ratio and momentum factor of neural network roundly. The disadvantage of neural networks that their structure and parameters were decided stochastically or by one's experience was overcome in this way, and the surge of algorithm was restrained. IGA-bp algorithm was used to recognize handwritten numerals, a recognition model of handwritten numerals based on bp neural network was found, and the handwritten numeral recognition scheme based on IGA-bp algorithm was proposed. The experimental results show that this algorithm is better than SGA-bp algorithm and traditional bp algorithm in both speed and precision of convergence, We can obtain a better recognition effect using this algorithm.
In spite of its relatively slow learning speed, backpropagation (bp) is one of the most popular neural network training algorithms. Here, a method based on nonlinear stretching is presented that modifies the activatio...
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The typical error back-propagation learning algorithm (bp) of neural networks with layered structure is shown to be useful in a wide range of practical applications. The “slowdown” of the change in the evaluation er...
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