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高保真中子输运程序HNET共振计算方法研究
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作者 朱雁凌 郝琛 张乐瑞 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2023年第5期808-814,共7页
为实现精细化中子物理计算程序HNET高效、精确的共振计算,本文基于自主开发的HDF5格式多群数据库研究并优化了子群共振计算方法。针对子群参数的计算,研究并实施了经调整拟合点方法优化后的帕德近似法,以保证子群参数计算的准确性;为提... 为实现精细化中子物理计算程序HNET高效、精确的共振计算,本文基于自主开发的HDF5格式多群数据库研究并优化了子群共振计算方法。针对子群参数的计算,研究并实施了经调整拟合点方法优化后的帕德近似法,以保证子群参数计算的准确性;为提高计算效率,需解决传统子群方法频繁调用中子输运求解器的问题,采用等效单共振群方法,并对共振核素进行分组,只对每组的代表性核素进行固定源方程求解。基于上述方法,开发了HNET共振计算模块,并针对典型基准例题进行分析验证。数值结果表明:优化后的子群方法能在保证计算效率的前提下,具有较高的计算精度。 展开更多
关键词 共振自屏计算 子群方法优化 子群参数 子群固定源方程 帕德近似法 等效单共振群方法 Bondarenko迭代方法
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A novel internet traffic identification approach using wavelet packet decomposition and neural network 被引量:7
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作者 谭骏 陈兴蜀 +1 位作者 杜敏 朱锴 《Journal of Central South University》 SCIE EI CAS 2012年第8期2218-2230,共13页
Internet traffic classification plays an important role in network management, and many approaches have been proposed to classify different kinds of internet traffics. A novel approach was proposed to classify network... Internet traffic classification plays an important role in network management, and many approaches have been proposed to classify different kinds of internet traffics. A novel approach was proposed to classify network applications by optimized back-propagation (BP) neural network. Particle swarm optimization (PSO) algorithm was used to optimize the BP neural network. And in order to increase the identification performance, wavelet packet decomposition (WPD) was used to extract several hidden features from the time-frequency information of network traffic. The experimental results show that the average classification accuracy of various network applications can reach 97%. Moreover, this approach optimized by BP neural network takes 50% of the training time compared with the traditional neural network. 展开更多
关键词 neural network particle swarm optimization statistical characteristic traffic identification wavelet packet decomposition
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