THE constitutional crisis in Mali was successfully settled when Dioncounda Traore, head of the country＇s National Assembly, was sworn in as the president of the interim government on April 12. As Mali is a big countr...THE constitutional crisis in Mali was successfully settled when Dioncounda Traore, head of the country＇s National Assembly, was sworn in as the president of the interim government on April 12. As Mali is a big country in West Africa with an area exceeding 1.24 million square km that occupies an important geographical position, the successful settlement of the constitutional crisis in the country will exert positive influence in dealing with the secessionist force in its north, prevent the Al-Qaeda force from penetrating into North Africa and maintain regional peace and stability.展开更多
A multi-strategy hybrid whale optimization algorithm(MSHWOA)for complex constrained optimization problems is proposed to overcome the drawbacks of easily trapping into local optimum,slow convergence speed and low opti...A multi-strategy hybrid whale optimization algorithm(MSHWOA)for complex constrained optimization problems is proposed to overcome the drawbacks of easily trapping into local optimum,slow convergence speed and low optimization precision.Firstly,the population is initialized by introducing the theory of good point set,which increases the randomness and diversity of the population and lays the foundation for the global optimization of the algorithm.Then,a novel linearly update equation of convergence factor is designed to coordinate the abilities of exploration and exploitation.At the same time,the global exploration and local exploitation capabilities are improved through the siege mechanism of Harris Hawks optimization algorithm.Finally,the simulation experiments are conducted on the 6 benchmark functions and Wilcoxon rank sum test to evaluate the optimization performance of the improved algorithm.The experimental results show that the proposed algorithm has more significant improvement in optimization accuracy,convergence speed and robustness than the comparison algorithm.展开更多
US President George W. Bush, in an effort to restore public confidence in the financial market, signed into law on July 30 the Public Company Accounting Reform and Investor Protection Act. The law allows for stiffer p...US President George W. Bush, in an effort to restore public confidence in the financial market, signed into law on July 30 the Public Company Accounting Reform and Investor Protection Act. The law allows for stiffer penalties to be imposed on anyone caught committing corporate and/or accounting fraud.展开更多
This is the author’s second consecutive year of doing the research.As the economy of China is booming,there is a rapid increase in the number of foreign students coming to The University of Hong Kong to learn Chinese...This is the author’s second consecutive year of doing the research.As the economy of China is booming,there is a rapid increase in the number of foreign students coming to The University of Hong Kong to learn Chinese.As Chinese is one of the popular subjects for them to choose,in 2019,there are around 1000 foreign students(undergraduates or exchange students)learning Chinese as a foreign language course.A language teacher is a facilitator and an instructor of Chinese learning for foreign students.However,in the real world,there are always some good language learners and some less talented language learners in one classroom.So,what is the secret of the good Chinese learners?What can the language instructors do in order to support good Chinese learners and help the less talented learners to learn Chinese?In the TESOL field,there are a lot of researches have been done by scholars.In the early 1970s,several researchers isolated and defined the concept of good language learner.But in teaching Chinese as a foreign language field,there are relatively fewer researches.So,from January 2017 to May 2019,I conducted a survey about good Chinese learners in CHIN9503 and CHIN9504 classes.The survey consisted of an interview with several questions and the author will discuss the result of a survey and its implications in this paper.This research is done in a macro way rather than micro way.Thus,this holistic research focuses on finding good Chinese learners rather than focusing on learners’individual differences.展开更多
锅炉燃烧优化在电厂锅炉经济稳定运行中起着重要作用,NO_(x)排放预测是其中的一个基本环节,因此提出了一种基于改进蜣螂优化算法优化卷积神经网络(convolutional neural network,CNN)与双向长短期记忆神经网络(long short term memory,L...锅炉燃烧优化在电厂锅炉经济稳定运行中起着重要作用,NO_(x)排放预测是其中的一个基本环节,因此提出了一种基于改进蜣螂优化算法优化卷积神经网络(convolutional neural network,CNN)与双向长短期记忆神经网络(long short term memory,LSTM)的组合模型超参数的超超临界锅炉NO_(x)排放预测的方法。首先通过Pearson相关性判定与NO_(x)排放相关的特征参数;其次建立CNN-LSTM预测模型,利用卷积神经网络CNN提取分层数据结构,长短期记忆网络挖掘长期依赖关系,然后结合佳点集、t分布变异策略对蜣螂算法进行改进,用改进后的算法对LSTM超参数进行优化得到最终预测模型;最后与其他神经网络模型进行对比验证。以某660 MW机组锅炉深度调峰实际数据进行预测,结果得到NO_(x)排放浓度实际值与预测值的平均绝对误差为3.3516,平均相对误差为2.4667,数据结果表明该预测模型具有更准确的预测效果。展开更多
文摘THE constitutional crisis in Mali was successfully settled when Dioncounda Traore, head of the country＇s National Assembly, was sworn in as the president of the interim government on April 12. As Mali is a big country in West Africa with an area exceeding 1.24 million square km that occupies an important geographical position, the successful settlement of the constitutional crisis in the country will exert positive influence in dealing with the secessionist force in its north, prevent the Al-Qaeda force from penetrating into North Africa and maintain regional peace and stability.
基金the National Natural Science Foundation of China(No.62176146)。
文摘A multi-strategy hybrid whale optimization algorithm(MSHWOA)for complex constrained optimization problems is proposed to overcome the drawbacks of easily trapping into local optimum,slow convergence speed and low optimization precision.Firstly,the population is initialized by introducing the theory of good point set,which increases the randomness and diversity of the population and lays the foundation for the global optimization of the algorithm.Then,a novel linearly update equation of convergence factor is designed to coordinate the abilities of exploration and exploitation.At the same time,the global exploration and local exploitation capabilities are improved through the siege mechanism of Harris Hawks optimization algorithm.Finally,the simulation experiments are conducted on the 6 benchmark functions and Wilcoxon rank sum test to evaluate the optimization performance of the improved algorithm.The experimental results show that the proposed algorithm has more significant improvement in optimization accuracy,convergence speed and robustness than the comparison algorithm.
文摘US President George W. Bush, in an effort to restore public confidence in the financial market, signed into law on July 30 the Public Company Accounting Reform and Investor Protection Act. The law allows for stiffer penalties to be imposed on anyone caught committing corporate and/or accounting fraud.
文摘This is the author’s second consecutive year of doing the research.As the economy of China is booming,there is a rapid increase in the number of foreign students coming to The University of Hong Kong to learn Chinese.As Chinese is one of the popular subjects for them to choose,in 2019,there are around 1000 foreign students(undergraduates or exchange students)learning Chinese as a foreign language course.A language teacher is a facilitator and an instructor of Chinese learning for foreign students.However,in the real world,there are always some good language learners and some less talented language learners in one classroom.So,what is the secret of the good Chinese learners?What can the language instructors do in order to support good Chinese learners and help the less talented learners to learn Chinese?In the TESOL field,there are a lot of researches have been done by scholars.In the early 1970s,several researchers isolated and defined the concept of good language learner.But in teaching Chinese as a foreign language field,there are relatively fewer researches.So,from January 2017 to May 2019,I conducted a survey about good Chinese learners in CHIN9503 and CHIN9504 classes.The survey consisted of an interview with several questions and the author will discuss the result of a survey and its implications in this paper.This research is done in a macro way rather than micro way.Thus,this holistic research focuses on finding good Chinese learners rather than focusing on learners’individual differences.
文摘锅炉燃烧优化在电厂锅炉经济稳定运行中起着重要作用,NO_(x)排放预测是其中的一个基本环节,因此提出了一种基于改进蜣螂优化算法优化卷积神经网络(convolutional neural network,CNN)与双向长短期记忆神经网络(long short term memory,LSTM)的组合模型超参数的超超临界锅炉NO_(x)排放预测的方法。首先通过Pearson相关性判定与NO_(x)排放相关的特征参数;其次建立CNN-LSTM预测模型,利用卷积神经网络CNN提取分层数据结构,长短期记忆网络挖掘长期依赖关系,然后结合佳点集、t分布变异策略对蜣螂算法进行改进,用改进后的算法对LSTM超参数进行优化得到最终预测模型;最后与其他神经网络模型进行对比验证。以某660 MW机组锅炉深度调峰实际数据进行预测,结果得到NO_(x)排放浓度实际值与预测值的平均绝对误差为3.3516,平均相对误差为2.4667,数据结果表明该预测模型具有更准确的预测效果。
