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基于Kriging模型的多次尝试差分进化贝叶斯有限元模型修正 被引量:1
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作者 秦世强 李宁 宋任贤 《振动与冲击》 EI CSCD 北大核心 2024年第9期204-213,共10页
标准差分进化自适应Metropolis(differential evolution adaptive Metropolis,DREAM)算法需进行多条马氏链并行计算,存在收敛效率低和计算成本高的问题。为此,提出一种基于Kriging模型的多次尝试差分进化贝叶斯有限元模型修正(multiple-... 标准差分进化自适应Metropolis(differential evolution adaptive Metropolis,DREAM)算法需进行多条马氏链并行计算,存在收敛效率低和计算成本高的问题。为此,提出一种基于Kriging模型的多次尝试差分进化贝叶斯有限元模型修正(multiple-try differential evolution adaptive Metropolis with“ZS”,MT-DREAM(ZS))框架。该框架在DREAM的基础上引入历史向量差分采样、斯诺克更新以及多次尝试Metropolis抽样,并利用Kriging模型代替有限元模型进行随机抽样,实现利用极少数并行链便可快速探索多维修正参数后验分布。利用固结钢板梁模型试验,比较了DREAM和MT-DREAM(ZS)的修正效果。结果表明:MT-DREAM(ZS)可实现马尔科夫链的快速收敛,其收敛效率较DREAM提升了3.42倍,且修正结果精度和稳定性有提升;Kriging模型可大幅度降低计算成本。所提框架为解决多参数不确定模型修正中的收敛效率低和计算成本高等问题提供了一种新思路。 展开更多
关键词 有限元模型修正 贝叶斯估计 多次尝试Metropolis抽样 差分进化自适应Metropolis(DREAM) KRIGING模型
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基于自适应多保真度Co-Kriging代理模型的地下水污染源反演识别 被引量:1
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作者 安永凯 张岩祥 闫雪嫚 《中国环境科学》 EI CAS CSCD 北大核心 2024年第3期1376-1385,共10页
为高效率高精度地进行地下水污染源反演识别,综合运用高保真度和低保真度地下水溶质运移数值模拟模型,研究应用集成差分进化算法的Co-Kriging方法建立模拟模型的多保真度代理模型;在此基础上,探索应用马尔科夫链蒙特卡洛(MCMC)-DREAM_((... 为高效率高精度地进行地下水污染源反演识别,综合运用高保真度和低保真度地下水溶质运移数值模拟模型,研究应用集成差分进化算法的Co-Kriging方法建立模拟模型的多保真度代理模型;在此基础上,探索应用马尔科夫链蒙特卡洛(MCMC)-DREAM_((D))算法,并采用自适应更新多保真度代理模型策略进行地下水污染源反演识别.为验证上述方法的有效性和可行性,开展了数值算例研究.结果表明:相比仅基于高保真度模型输入-输出样本构建的Kriging代理模型,联合运用高保真度和低保真度模型输入-输出样本构建的Co-Kriging代理模型对模拟模型的逼近精度更高;耦合多保真度Co-Kriging代理模型和MCMC-DREAM_((D))算法能够得到较高精度的污染源反演结果,且能够大幅度减小计算负荷;同时,采用自适应更新多保真度代理模型策略能够进一步提高污染源反演识别精度. 展开更多
关键词 地下水污染源 多保真度代理模型 Co-Kriging方法 DREAM((D))算法 自适应
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考虑不确定性的高速列车车轮有限元模型修正
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作者 曹明明 彭珍瑞 《兰州交通大学学报》 CAS 2024年第4期45-52,共8页
为了提高高速列车车轮模型修正效率和降低模型修正误差,考虑不确定性影响因素,提出了一种基于DREAM和Kriging模型的贝叶斯模型修正方法,并将其应用于高速列车车轮有限元模型修正。首先,根据设计参数建立某高速列车车轮有限元模型,初始... 为了提高高速列车车轮模型修正效率和降低模型修正误差,考虑不确定性影响因素,提出了一种基于DREAM和Kriging模型的贝叶斯模型修正方法,并将其应用于高速列车车轮有限元模型修正。首先,根据设计参数建立某高速列车车轮有限元模型,初始待修正参数样本,由拉丁超立方抽样产生,分析不同样本所对应的频率函数并提取小波系数。其次,以车轮待修正参数初始样本为输入,小波分解后所得小波系数为输出构建Kriging模型。最后,使用满足精度要求的Kriging模型代替高速列车车轮有限元模型进行有限元分析,并使用DREAM算法对高速列车车轮有限元模型待修正参数进行修正。结果表明,基于DREAM和Kriging模型的贝叶斯模型修正方法,可以节约大量模型修正时间,提高模型修正效率,且修正后的高速列车车轮有限元模型误差较小。 展开更多
关键词 高速列车车轮 小波系数 DREAM KRIGING模型 贝叶斯模型修正
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基于DREAM算法的DSGE模型参数估计精度研究
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作者 罗琦 赵胜民 《统计与决策》 CSSCI 北大核心 2024年第2期46-51,共6页
文章将人工智能算法中的DREAM算法首次应用到动态随机一般均衡模型的参数估计中,并以动态随机一般均衡模型LS(2005)为例对该算法的估计精度进行了系统分析,研究结果表明:根据待估参数随机抽样序列的箱线图来看,由DREAM算法产生的待估参... 文章将人工智能算法中的DREAM算法首次应用到动态随机一般均衡模型的参数估计中,并以动态随机一般均衡模型LS(2005)为例对该算法的估计精度进行了系统分析,研究结果表明:根据待估参数随机抽样序列的箱线图来看,由DREAM算法产生的待估参数随机抽样序列的箱体长度均比RWMH和IMH算法产生的箱体长度要长,说明由DREAM算法产生的参数估计序列的分散程度比RWMH和IMH算法要大,表明了DREAM算法遍历参数空间范围更为广泛,算法逃逸局部最优值的能力更强。另外,从箱线图中的中位数数值来看,除了5个参数以外,由DREAM算法产生的参数估计序列的中位数相比RWMH和IMH算法,与真实数据生成过程更为接近,说明由DREAM算法产生的参数估计值大部分都集中在参数的真值附近。由于DREAM算法依据IQR统计方法除去无用链,故由DREAM算法产生的参数估计序列的异常值也明显降低,而RWMH算法产生的参数估计序列的异常值尤其多。从待估参数的90%最大后验密度可信区间来看,DREAM算法产生的待估参数90%最大后验密度可信区间除了3个参数以外,其余全部包含了真值,而传统的RWMH和IMH算法分别只有7个和1个区间包含了真值,表明DREAM算法的估计不确定性远小于传统的RWMH和IMH算法。最后,根据待估参数的无效因子来看,DREAM算法产生的待估参数序列与传统的RWMH和IMH算法相比,其相关性更弱,即无效因子数值更小,这一点进一步验证了DREAM算法遍历整个参数空间的能力更强。 展开更多
关键词 DREAM算法 DSGE模型 估计精度
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Being the Pioneer for Environmental Protection and Big Health Industry--Interview with Taira Shoko,Chairperson of Risho Group,Chairperson and CEO of UPRISE
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《China's Foreign Trade》 2024年第4期28-31,共4页
From an ordinary biology teacher in China to the chairperson of Risho Group and Chairperson and CEO of Uprise in Japan,Taira Shoko has always followed her original commitments and pursued her dreams bravely to become ... From an ordinary biology teacher in China to the chairperson of Risho Group and Chairperson and CEO of Uprise in Japan,Taira Shoko has always followed her original commitments and pursued her dreams bravely to become a woman undefined by society.She has been showing her wisdom and talents in the environmental protection and health industries to become a business star of the current era. 展开更多
关键词 PIONEER DREAMS ordinary
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College students compete in the National Standardization Olympiad
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《China Standardization》 2024年第6期9-9,共1页
The finals of the “Mo Gan Shan” National Standardization Olympiad of College Students were held on October 12-13 in Huzhou city, Southeast China's Zhejiang province.The competition was guided by SAMR, and hosted... The finals of the “Mo Gan Shan” National Standardization Olympiad of College Students were held on October 12-13 in Huzhou city, Southeast China's Zhejiang province.The competition was guided by SAMR, and hosted by the China Association for Standardization(CAS), China Jiliang University, and the National Standardization League of Universities. Themed “Standards lead the future, innovation fulfills dreams”, the competition aims to stimulate college students' interest and enthusiasm for standardization knowledge, and cultivate standardization talents with international vision and innovation capability. 展开更多
关键词 DREAMS STANDARDIZATION STANDARDIZATION
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Dreaming across Languages and Cultures
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作者 ZHOU LIN 《China Today》 2024年第11期64-66,共3页
From a Ph.D.student to a budding sinologist,a young Spanish woman explains her vision for more cultural exchanges between China and her country.DREAM of the Red Chamber,Cao Xueqin’s classic about the rise and decline... From a Ph.D.student to a budding sinologist,a young Spanish woman explains her vision for more cultural exchanges between China and her country.DREAM of the Red Chamber,Cao Xueqin’s classic about the rise and decline of a family that is also a portrayal of its contemporary Qing Dynasty(1644-1911),continues to inspire and influence long after it was published in the 18th century.Patricia Amate Núñez is a current acolyte. 展开更多
关键词 DREAM CONTINUE EXCHANGES
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Dan Sandoval:Capturing a Lively China
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作者 DENG DI 《China Today》 2024年第3期68-70,共3页
An American photographer who has spent one-third of his life in China hopes his work will inspire others to embrace adventure in the fascinating country.“THIS is the Great Wall.It’s gorgeous.That’s what hikers drea... An American photographer who has spent one-third of his life in China hopes his work will inspire others to embrace adventure in the fascinating country.“THIS is the Great Wall.It’s gorgeous.That’s what hikers dream of.Layers upon layers of mountains,the remains of the ancient Great Wall,the cities in the back,the colors,the sky.That’s China in a nutshell.”That was a Beijing-based American photographer Dan Sandoval’s tribute while standing in the Guidegou section of the Great Wall,watching the sunrise with his companion,British adventurer Ash Dykes. 展开更多
关键词 MOUNTAINS GREAT DREAM
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Chinese Dolls Tell Chinese Stories
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作者 ZHAO YANG 《China Today》 2024年第11期68-71,共4页
Tang Yan,inheritor of the Beijing silk figurines craft,builds her own dreams and helps others realize theirs.FROM February 9-17 this year,nine festive activities centered on the Chinese Spring Festival,which included ... Tang Yan,inheritor of the Beijing silk figurines craft,builds her own dreams and helps others realize theirs.FROM February 9-17 this year,nine festive activities centered on the Chinese Spring Festival,which included art performances,intangible cultural heritage exhibitions,and tourism promotion,were staged one after another in Trafalgar Square in London,the Assembly Rooms in Edinburgh,and a museum in Ireland’s Dublin.Audiences were captivated by the charm of Chinese culture exhibited through the festive atmosphere of the Chinese Spring Festival.At the activities,Beijing silk figurines,known in China as juanren,attracted the attention of many people. 展开更多
关键词 Edinburgh DUBLIN DREAMS
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FROM PHNOM PENH TO BEIJING:Two Cambodian students reflect on their lifechanging matriculation in China
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作者 Zhang Shuo 《China Report ASEAN》 2024年第12期54-55,共2页
Yncreasingly relations between china and Cambodia are propelling more and more Cambodian students to seize their dreams through studying in China.The year 2024 marks the China-Cambodia People-to-People Exchange Year.C... Yncreasingly relations between china and Cambodia are propelling more and more Cambodian students to seize their dreams through studying in China.The year 2024 marks the China-Cambodia People-to-People Exchange Year.Coincidentally,it is also the year Teng Polisa and Khom Somnang,two Cambodian students from Phnom Penh,graduated from the Business School of Beijing International Studies University.They are already pursuing postgraduate studies at the same school and the University of International Business and Economics,respectively. 展开更多
关键词 DREAMS life GRADUATE
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Sweet Success
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作者 He Sen 《China Report ASEAN》 2024年第2期74-75,共2页
My name is He Sen,and I’m from Bangladesh.Every year,numerous foreigners like myself flock to Yiwu,known as the World’s Capital of Small Commodities,in pursuit of dreams.Chinese President Xi Jinping has highlighted ... My name is He Sen,and I’m from Bangladesh.Every year,numerous foreigners like myself flock to Yiwu,known as the World’s Capital of Small Commodities,in pursuit of dreams.Chinese President Xi Jinping has highlighted Yiwu at various international conferences.I became quite curious about how this initially unassuming town transformed into such a commercial powerhouse,as if it were capable of“turning rocks into gold.” 展开更多
关键词 SWEET TURNING DREAMS
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Red Envelopes: Opening a Legacy
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作者 《China Report ASEAN》 2024年第4期56-57,共2页
University application season left many of my peers adrift or overwhelmed,but I had steadfastly been pointed in the right direction.This sense of direction was instilled in me by my grandfather,Low King Wing.Although ... University application season left many of my peers adrift or overwhelmed,but I had steadfastly been pointed in the right direction.This sense of direction was instilled in me by my grandfather,Low King Wing.Although he passed away when I was only three,my grandpa remains a towering figure of respect in my life.At that tender age,I couldn’t grasp the finality of his departure.All I knew was that Grandpa lay still in the coffin,unresponsive to my cries,no matter how hard I wailed.Exhausted from crying,I fell asleep.In a dream,Grandpa hugged me tightly,as he always did,urging me to eat well,grow up strong,and be happy every day.This embrace inexplicably brought more tears. 展开更多
关键词 DREAM GRAND TEARS
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The Application of Embodied Cognitive Linguistics in the English Translation of Two-Part Allegorical Saying—An Analysis of Examples From A Dream of Red Mansions
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作者 HE Jiamei ZOU Jianling 《Sino-US English Teaching》 2024年第7期337-342,共6页
As a kind of widely circulated folk language,two-part allegorical saying(“xiehouyu”)carries the wisdom of the Chinese people and is characterized with humor and vivid imagery.Taking the two English translation versi... As a kind of widely circulated folk language,two-part allegorical saying(“xiehouyu”)carries the wisdom of the Chinese people and is characterized with humor and vivid imagery.Taking the two English translation versions of A Dream of Red Mansions as examples,this paper analyzes the English translation of two-part allegorical saying based on the core principle of Embodied Cognitive Linguistics(ECL),“Reality-Cognition-Language”,and explores how the English translation of two-part allegorical saying reflects the three dimensions of ECL. 展开更多
关键词 two-part allegorical saying A Dream in Red Mansions Embodied Cognitive Linguistics TRANSLATION
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Translation Studies from a Cross-Cultural Perspective:Reinventing Subjectivity-A Case Study of English Translation of A Dream of Red Mansions
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作者 YANG Yin-chuan YANG Zhan 《Journal of Literature and Art Studies》 2024年第4期279-283,共5页
The integration of cross-cultural inquiries into the realm of translation has given rise to a distinct subfield known as cross-cultural translation studies.This approach emphasizes the importance of delving into the c... The integration of cross-cultural inquiries into the realm of translation has given rise to a distinct subfield known as cross-cultural translation studies.This approach emphasizes the importance of delving into the cultural subtleties and the awareness of cultural subjectivity within the translation process.Central to this framework is the concept of reshaping cultural nuances and the subjectivity of culture.This paper introduces three principal translation strategies that emerge from a cross-cultural standpoint:the alienation translation strategy,the‘cannibalism’translation strategy,and the destructive translation strategy.Utilizing the English translation of“Dream of the Red Chamber”as a case study,the paper examines how cultural nuances and cultural subjectivity influence the selection of translation strategies and demonstrates the practical application of cross-cultural research within the translation sphere.Hence,the significance of cross-cultural translation studies lies in its capacity to offer a novel lens through which to view translation studies.It encourages a reevaluation of cultural nuances and subjectivity in translation,which is of profound practical importance for advancing the field of translation studies,enhancing cross-cultural communication,and facilitating the spread of Chinese discourse on the global stage. 展开更多
关键词 CROSS-CULTURAL translation strategies A Dream of Red Mansions
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My Dream of Becoming a Good Teacher
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作者 任怡敏 陈需亮(指导) 《中学生英语》 2024年第42期7-7,共1页
I want to be a teacher because I love students very much.And I am eager to make my students learn more knowledge.In my opinion,the teacher is the greatest job.I can teach students how to study,how to be a person who p... I want to be a teacher because I love students very much.And I am eager to make my students learn more knowledge.In my opinion,the teacher is the greatest job.I can teach students how to study,how to be a person who possesses the good manners and so on. 展开更多
关键词 And DREAM KNOWLEDGE
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A Spectacle of Tradition and Modernity
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作者 KATRINA JACOB 《ChinAfrica》 2024年第10期56-57,共2页
China Through My Camera programme provides Namibian influencer a chance to get a multidimensional view of the country.After graduating in Beijing in 2020 during the tumultuous period of COVID-19,I didn’t think that I... China Through My Camera programme provides Namibian influencer a chance to get a multidimensional view of the country.After graduating in Beijing in 2020 during the tumultuous period of COVID-19,I didn’t think that I would be able to return to China anytime soon.The pandemic had disrupted lives globally,and like many international students,I was not sure if I would be able to ever set foot in China again.Travel restrictions were stringent,and the idea of returning seemed like a distant dream. 展开更多
关键词 DREAM DIS GET
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Towering Aspirations China attaches special importance to young people in its space cooperation with Africa
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作者 LI XIAOYU 《ChinAfrica》 2024年第5期25-27,共3页
Prosper Oshomame,a 20-year-old Nigerian artist,is closer than ever to fulfilling his childhood dream of exploring space.His painting Shared Aspirations travelled to space with the Shenzhou-16 mission,which ran from Ma... Prosper Oshomame,a 20-year-old Nigerian artist,is closer than ever to fulfilling his childhood dream of exploring space.His painting Shared Aspirations travelled to space with the Shenzhou-16 mission,which ran from May to October 2023. 展开更多
关键词 CLOSER TRAVEL DREAM
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Gesang Pedron,the First Female Tibetan Air Force Pilot
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作者 Fu Qiang(Text/Photos) Gyama Dorje(Text/Photos) Huang Wenjuan(Translated) 《China's Tibet》 2024年第4期48-49,共2页
On the momentous occasion of the 60th anniversary of the People's Republic of China in 2009,the inaugural group of female Air Force pilots joined their male counterparts to form the Chinese Air Force Echelon,soari... On the momentous occasion of the 60th anniversary of the People's Republic of China in 2009,the inaugural group of female Air Force pilots joined their male counterparts to form the Chinese Air Force Echelon,soaring over Tian'anmen Square.Their aerobatic displays captivated the nation, earning widespread admiration for their heroic demeanor,courageous spirit,and striking presence.This spectacle of confidence and youthful elegance inspired countless young girls,including a Tibetan teenager from the distant snowy plateau.Dreaming of serving her country,she harbored aspirations to one day turn these dreams into reality and see the seeds of her ambition blossom.In this new era,these intrepid female pilots patrol the azure boundaries of the sea,guard the skies above the motherland,and stand watch over the snowy highland. 展开更多
关键词 TIBETAN DREAMS HARBOR
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This Time Next Year
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作者 董璐萱 《中学生英语》 2024年第6期6-6,共1页
It will be excited to imagine what life will be like this time next year.At this moment,I will be listening to new teachers with my new classmates in a new classroom.Although I'm not good at making friends,but I w... It will be excited to imagine what life will be like this time next year.At this moment,I will be listening to new teachers with my new classmates in a new classroom.Although I'm not good at making friends,but I will try my best to get on well with them.I hope I can share my happiness and sadness with them.Of course,study is still the most important thing.I will continue to study hard to make my dream comes3 true. 展开更多
关键词 DREAM GET CONTINUE
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Living the Mechanical Dream
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作者 KEDIR ABDUREZAK NURIYE 《ChinAfrica》 2024年第3期56-56,共1页
Studying in China is not just about academics,it is also about connecting with communities and learning local culture.As a child,I was captivated by machines and their inner workings.I yearned to design contraptions t... Studying in China is not just about academics,it is also about connecting with communities and learning local culture.As a child,I was captivated by machines and their inner workings.I yearned to design contraptions that could solve real-world problems and improve people’s lives.So,when it came time to choose a university,I knew that mechanical engineering was the path for me. 展开更多
关键词 earned connecting DREAM
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