共查询到20条相似文献，搜索用时 593 毫秒
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分析民航空中交通管制专业教育质量评估的必要性,并结合管制工作的特点,分析了管制员教育教学质量评估的目的和作用,最后结合空中交通管制教学特点,分析了管制员培养质量评估的具体内容。 相似文献
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为提高BP神经网络的预测精度,克服自身容易陷入局部极值和收敛速度慢的缺陷,将AdaBoost算法和BP神经网络结合起来,建立基于AdaBoost算法的BP神经网络模型。该模型将多个BP神经网络作为弱预测器,然后采用AdaBoost算法将多个弱预测器组成强预测器进行预测。将该模型应用于软件老化测试,实验结果表明,该模型相比单个BP神经网络具有更好的预测精度。 相似文献
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软件质量评估是软件项目开发中的重要环节之一。针对软件质量缺乏综合性评价体系和方法的问题,通过分析软件质量体系,选取适当软件质量属性作为评估指标,引入BP神经网络算法,提出一种基于BP神经网络的软件质量评估模型。以样本数据训练神经网络,并对网络进行测试。结果表明,该方法能够较为准确地评估软件质量,对提高软件质量具有参考价值。 相似文献
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针对目前教学质量评价过程中存在的评价方法单一、主观性强等问题，为进一步提高教学质量评价的有效性和准确性，将粒子群算法(IPSO)和BP神经网络相融合，建立了一种基于IPSO-BP算法的神经网络评价模型。利用教学方法、教学内容、教学态度以及教学效果4个指标构建教学质量评价指标体系；采用IPSO算法对BP模型的参数进行训练，优化其权值和阈值；将训练好的模型用于教学质量评价的测试和验证。结果表明，所构建的IPSO-BP模型收敛速度快、寻址效率高，可大大提高评估准确率，与普通BP神经网络相比，预测准确率达到96.7%,在教学质量评价中具有一定的应用和参考价值。 相似文献
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针对标准的BP神经网络对于声音信号识别率不高的问题,提出了一种用粒子群算法(PSO)优化BP神经网络的算法,建立了声音信号识别模型。PSO优化BP神经网络主要是用PSO来优化BP神经网络的初始权值和阈值,然后通过训练BP神经网络得到识别模型的最优解,优化后的神经网络具有误判率小、反应速度快等特点。在实验中把标准的BP神经网络和PSO优化后的BP神经网络用于八种异常声音的MFCC特征量和差分MFCC特征量识别,结果表明:在声音信号的识别系统中采用PSO优化BP神经网络的算法提高了系统的识别性能,达到了系统设计的目的。 相似文献
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卢振坤 《广西大学梧州分校学报》2006,(4)
本文利用BP算法的前馈神经网络方法建立教学质量评估模型,通过MATLAB神经网络工具箱学习训练网络,经测试数据验证,结果比较准确,能克服各种人为因素,具有广泛的适用性。 相似文献
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基于BP算法的神经网络用于教学质量评估 总被引：4，自引：0，他引：4
本文利用BP算法的前馈神经网络方法建立教学质量评估模型,通过MATLAB神经网络工具箱学习训练网络,经测试数据验证,结果比较准确,能克服各种人为因素,具有广泛的适用性. 相似文献
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李伟 《石家庄铁路职业技术学院学报》2012,(2)
为准确、快速、高效地预测电网短期负荷,提出改进的粒子群算法(DPSO),并与BP算法相结合,形成改进的粒子群—BP(DPSO-BP)神经网络算法,用此算法训练神经网络,实现神经网络参数优化,得到基于DPSO-BP算法的神经网络模型.算例分析表明,与传统BP神经网络法和PSO-BP神经网络方法相比,该方法改善BP神经网络的泛化能力,预测精度高,收敛速度快,对电力系统短期负荷具有良好的预测能力 相似文献
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应用BP神经网络对高层建筑进行防火评估,弥补目前国内防火评估的不足。通过对高层建筑防火系统、灭火系统、安全疏散系统、管理及其它因素进行分析,运用加动量因子和变步长的优化算法建立BP神经网络。运用Matlab7.0实现对高层建筑防火评估的仿真,仿真结果误差控制在5%以内。实例表明,该系统符合要求,具有一定的实用价值。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献