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Design of a Metasurface Antenna Based on Characteristic Mode Theory
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作者 HE Huan 《电讯技术》 北大核心 2024年第10期1561-1568,共8页
A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutua... A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutually orthogonal principal modes of the optimized periodic patch structure areexcited by a center-feed dipole.A differential feeding network is employed to realize impedance matching.Prototype with profile height of 0.07λ_(0)(λ_(0)is the wavelength in free space at the lowest operatingfrequency)is fabricated and assembled to verify the simulation results.The measured results show that thereflectance coefficient of proposed matesurface antenna is less than-10 dB in the whole operating bandrange from 4.2 GHz to 5.5 GHz,a relative bandwidth of 26.8%is achieved,and the maximummeasured realized gain is more than 9 dBi with a maximum radiation efficiency of 90%.The designprovides a guideline on the application of characteristic modes(CMs)to radiation problems. 展开更多
关键词 metasurface antenna characteristic mode theory dipole antenna realized gain
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New 3-mode bosonic operator realization of SU(2) Lie algebra:From the point of view of squeezing
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作者 笪诚 陈千帆 范洪义 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第9期62-64,共3页
We consider the quantum mechanical SU(2) transformation e^2λJzJ±e^-2λJz = e^±2λJ±as if the meaning of squeezing with e^±2λ being squeezing parameter. By studying SU(2) operators (J±,... We consider the quantum mechanical SU(2) transformation e^2λJzJ±e^-2λJz = e^±2λJ±as if the meaning of squeezing with e^±2λ being squeezing parameter. By studying SU(2) operators (J±, Jz) from the point of view of squeezing we find that (J±,Jz) can also be realized in terms of 3-mode bosonic operators. Employing this realization, we find the natural representation (the eigenvectors of J+ or J-) of the 3-mode squeezing operator e^2λJz. The idea of considering quantum SU(2) transformation as if squeezing is liable for us to obtain the new bosonic operator realization of SU(2) and new squeezing operators. 展开更多
关键词 quantum mechanical SU(2) transformation 3-mode squeezing operator new 3-mode bosonic op-erator realization of SU(2) Lie algebra
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Periodic Packing Mode for Trickle-Bed Reactors: Experiments and Modeling 被引量:2
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作者 刘国柱 米镇涛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第3期372-378,共7页
A periodic packing mode of trickle-bed reactor (TBR) for the gas limited reaction was proposed. Hy-drogenation of 2-ethylanthraquinone over Pd/Al2O3 in a laboratory-scale TBR was taken as a test reaction for determini... A periodic packing mode of trickle-bed reactor (TBR) for the gas limited reaction was proposed. Hy-drogenation of 2-ethylanthraquinone over Pd/Al2O3 in a laboratory-scale TBR was taken as a test reaction for determining whether the periodic packing mode is advantageous. The effects of operating conditions and packing type on TBR performance were experimentally examined to demonstrate the cause-effect relationships. A mathe-matic model of TBR considering axial dispersion and fractional wetting was developed to quantitatively illuminate the reason of performance enhancement. 展开更多
关键词 trickle-bed reactor periodic packing mode modeLING HYDROGENATION 2- ethylanthraquinone
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Roll System and Stock's Multi-parameter Coupling Dynamic Modeling Based on the Shape Control of Steel Strip 被引量:3
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作者 Yang ZHANG Yan PENG +1 位作者 Jianliang SUN Yong ZANG 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第3期614-624,共11页
The existence of rolling deformation area in the rolling mill system is the main characteristic which dis- tinguishes the other machinery. In order to analyze the dynamic property of roll system's flexural deformatio... The existence of rolling deformation area in the rolling mill system is the main characteristic which dis- tinguishes the other machinery. In order to analyze the dynamic property of roll system's flexural deformation, it is necessary to consider the transverse periodic movement of stock in the rolling deformation area which is caused by the flexural deformation movement of roll system simul- taneously. Therefore, the displacement field of roll system and flow of metal in the deformation area is described by kinematic analysis in the dynamic system. Through intro- ducing the lateral displacement function of metal in the deformation area, the dynamic variation of per unit width rolling force can be determined at the same time. Then the coupling law caused by the co-effect of rigid movement and flexural deformation of the system structural elements is determined. Furthermore, a multi-parameter coupling dynamic model of the roll system and stock is established by the principle of virtual work. More explicitly, the cou- pled motion modal analysis was made for the roll system. Meanwhile, the analytical solutions for the flexural defor- mation movement's mode shape functions of rolls are discussed. In addition, the dynamic characteristic of the lateral flow of metal in the rolling deformation area has been analyzed at the same time. The establishment ofdynamic lateral displacement function of metal in the deformation area makes the foundation for analyzing the coupling law between roll system and rolling deformation area, and provides a theoretical basis for the realization of the dynamic shape control of steel strip. 展开更多
关键词 Roll system Rolling deformation area Coupling dynamic model mode shape function - Lateraldisplacement function
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Analysis of microstructure and performance of temper bead welded joints for SA508-3 steel by Quenching and Tempering mode 被引量:1
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作者 Qin Jian Li Shiqian +2 位作者 Lv Xiaochun Zhang Huiwen Du Bing 《China Welding》 EI CAS 2017年第1期15-20,共6页
The HAZ microstructure and performance of Quenching and Tempering mode temper bead welding and general welded joints which were made on SA508-3 steel of 60 mm thickness were compared in this article. The result shows ... The HAZ microstructure and performance of Quenching and Tempering mode temper bead welding and general welded joints which were made on SA508-3 steel of 60 mm thickness were compared in this article. The result shows that tempering sorbite which has excellent overall performance was obtained in both modes. The microstructure of Quenching and Tempering mode welded joints got more fine grain. Even though the hardness of tempering bead welded joints is higher than the general one,it still meets the standards which is lower than 350 HV. The impact absorbing energy of each district of tempering bead welded joints HAZ reached 170 J,which is equal to general one. 展开更多
关键词 SA508 -3 steel TEMPER BEAD welding Quenching and Tempering mode coarse GRAIN HEAT AFFECTED ZONE inter critical-coarse GRAIN HEAT AFFECTED ZONE
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Stabilization of CSTR w ith Self-tuning Sliding Mode Controller Using T-S Fuzzy Linearization 被引量:2
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作者 朱群雄 王军霞 《Journal of Donghua University(English Edition)》 EI CAS 2013年第4期287-292,共6页
A self-tuning reaching law based sliding mode control(SMC)theory is proposed to stabilize the nonlinear continuous stirred tank reactor(CSTR).T-S fuzzy logic is used to build a global fuzzy state-space linear model.Co... A self-tuning reaching law based sliding mode control(SMC)theory is proposed to stabilize the nonlinear continuous stirred tank reactor(CSTR).T-S fuzzy logic is used to build a global fuzzy state-space linear model.Combing the traits of SMC and CSTR,three fuzzy rules can meet the requirements of controlled system.The self-tuning switch control law which can drive the state variables to the sliding surface as soon as possible is designed to ensure the robustness of uncertain fuzzy system.Lyapunov equation is applied to proving the stability of the sliding surface.The simulations show that the proposed approach can achieve desired performance with less chattering problem. 展开更多
关键词 sliding mode control(SMC) continuous stirred tank reactor (STR) T-S fuzzy model self-tuning switch control lawCLC number:TP13Document code:AArticle ID:1672-5220(2013)04-0287-06
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Operational Mode Identification Based on Sliding Time Window Method and Eigensystem Realization Algorithm
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作者 WANG Liang ZHANG Yan +1 位作者 CAI Yipeng NANGONG Zijun 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第5期838-844,共7页
The identification result of operational mode is eurychoric while operational mode identification is investigated under ambient excitation,which is influenced by the signal size and the time interval.The operational m... The identification result of operational mode is eurychoric while operational mode identification is investigated under ambient excitation,which is influenced by the signal size and the time interval.The operational mode identification method,which is based on the sliding time window method and the eigensystem realization algorithm(ERA),is investigated to improve the identification accuracy and stability.Firstly,the theory of the ERA method is introduced.Secondly,the strategy for decomposition and implementation is put forward,including the sliding time window method and the filtration method of modes.At last,an example is studied,where the model of a cantilever beam is built and the white noise exciting is input.Results show that the operational mode identification method can realize the modes,and has high robustness to the signal to noise ratio and signal size. 展开更多
关键词 mode identification ROBUST eigensystem realization algorithm(ERA) operational mode damping ratio
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Basic conditions study to accelerate the realization of transformation of Shaanxi's economy growth mode
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作者 LIU Shu-ru QI Long 《Chinese Business Review》 2010年第2期61-64,60,共5页
It is an urgent and important economic work in the moment and the next period for China to realize the transformation of economic growth mode. Relatively, there must be certain basic conditions. This article makes ela... It is an urgent and important economic work in the moment and the next period for China to realize the transformation of economic growth mode. Relatively, there must be certain basic conditions. This article makes elaboration of the basic conditions, which accelerate the change of Shaanxi's economic growth mode from government angle, and proposes countermeasures for it, according to Shaanxi's situation and the requirement of scientific development concept, in order to provide basis for the government's economic growth transformation. 展开更多
关键词 scientific development concept accelerate the realization economic growth mode TRANSFORMATION basic conditions
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MIXED MODE SCC OF 18-8 STAINLESS STEEL IN BOILING 42% MgCl_2 SOLUTION
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作者 GAO Hua CAO Weijie ZHOU Deqi WANG Ruizhen Shanghai University of Engineering Science,Shanghai,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1992年第8期104-109,共6页
A series of mixed mode tests were carried out on 18-8 stainless steel in boiling 42% MgCl_2 solution.The results show that for any K_Ⅱ/K_Ⅰ ratio,the SCC direction coin- cides well with the crack tip maximum normal s... A series of mixed mode tests were carried out on 18-8 stainless steel in boiling 42% MgCl_2 solution.The results show that for any K_Ⅱ/K_Ⅰ ratio,the SCC direction coin- cides well with the crack tip maximum normal stress plane,while the SCC resistance of the material reduces as the ratio of K_Ⅱ/K_Ⅰ increases.The experimental results were discussed in the light of anode dissolving mechanism and the effect of mixed mode loading on crack tip stress and strain.It is concluded that for fracture analysis if mixed mode cracks were simply taken into account as mode Ⅰ cracks,and only mode Ⅰ testing results as mode Ⅰ fracture criter- ion were employed,it may not be safe. 展开更多
关键词 18-8 stainless steel stress corrosion mixed mode
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Eurovet Unveils the New Image of Hong Kong Mode Lingerie 2010 March 30-31, at the Hong Kong Convention and Exhibition Centre
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《China Textile》 2010年第2期20-21,共2页
Organized by Eurovet, the world’s leading lingerie and beachwear trade show organizer and supported by Hong
关键词 2010 Eurovet Unveils the New Image of Hong Kong mode Lingerie 2010 March 30-31 at the Hong Kong Convention and Exhibition Centre
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生态产品价值实现模式应用场景及其运行机制——基于典型案例文本数据的实证分析 被引量:3
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作者 李冬青 张明雪 侯玲玲 《生态学报》 CAS CSCD 北大核心 2024年第7期2826-2836,共11页
因地制宜选择实现模式是建立健全生态产品价值实现机制、践行“两山理论”的重要举措。利用自然资源部和生态环境部推介的生态产品价值实现典型案例文本词频数据,采用随机森林分析方法,从自然资本、生态服务和参与主体三个角度,实证总... 因地制宜选择实现模式是建立健全生态产品价值实现机制、践行“两山理论”的重要举措。利用自然资源部和生态环境部推介的生态产品价值实现典型案例文本词频数据,采用随机森林分析方法,从自然资本、生态服务和参与主体三个角度,实证总结了不同价值实现模式的应用场景及其运行机制。研究表明:生态产业化经营模式主要是用于农地自然资本,通过市场手段激励农户等经营主体参与,提升农地供给生态产品的功能。生态资源指标及产权交易模式主要是用于林地自然资本,通过生态权益交易,协调公共和私人部门之间的利益,以保护森林的调节服务功能。生态补偿模式主要是用于水域自然资本,通过建立受益者和保护者之间的补偿机制,提升水域的调节和供给服务功能。生态修复及价值提升模式主要是用于废弃工矿用地自然资本,通过政府部门和市场主体联合开展修复整治,提升废弃工矿用地的文化服务和供给功能。研究结果为因地制宜建立生态产品价值实现推进机制提供政策参考。 展开更多
关键词 生态产品 价值实现 实现模式 机制分析
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基于土地生态敏感性评价的生态产品价值分区实现研究——以阿勒泰市为例 被引量:1
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作者 闫天亮 王承武 +2 位作者 陈梦茜 陈暄 赵文静 《干旱区地理》 CSCD 北大核心 2024年第4期612-621,共10页
良好的生态环境是维持人类生存与发展的基础,是国家生态文明建设的重要前提。利用GIS技术对阿勒泰市的生态环境进行敏感性评价。结果表明:(1)阿勒泰市生态环境敏感性影响程度由大到小排序为:土地利用类型>植被覆盖度>河流缓冲区&... 良好的生态环境是维持人类生存与发展的基础,是国家生态文明建设的重要前提。利用GIS技术对阿勒泰市的生态环境进行敏感性评价。结果表明:(1)阿勒泰市生态环境敏感性影响程度由大到小排序为:土地利用类型>植被覆盖度>河流缓冲区>道路缓冲区>高程>坡度>坡向。(2)阿勒泰市生态敏感性总体偏高,极度敏感和高度敏感等级区域占研究区总面积的42.45%,在北部山区、中部丘陵区,以及南部额尔齐斯河两岸均有分布;不敏感等级和低度敏感等级区域主要分布在中部丘陵和山间冲积平原区。(3)基于生态敏感性评价结果将阿勒泰市分生态保护区、生态提升区以及生态防护治理区3个区域,并根据区域特点提出完善生态补偿、特色生态旅游、生态农业、开展生态治理与修复等生态产品价值实现模式,为阿勒泰市生态产品价值实现提供实践参考。 展开更多
关键词 生态敏感性评价 生态产品 生态分区 价值实现模式 阿勒泰市
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XOD模式价值实现机制及隐性债务风险防范探讨——以水安全保障导向的开发(WOD)模式为例 被引量:2
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作者 张建红 翟广永 裴晓桃 《水利发展研究》 2024年第1期20-26,共7页
当前,单一靠财政投入已远不能满足城乡建设发展的需要,XOD模式作为一种创新型的项目组合实施方式应运而生。XOD的核心机理是“增肥哺瘦”,需要通过组合投资、溢价回收、协同增效3大机制和关联关系、一体开发、自求平衡3大原则来实现。实... 当前,单一靠财政投入已远不能满足城乡建设发展的需要,XOD模式作为一种创新型的项目组合实施方式应运而生。XOD的核心机理是“增肥哺瘦”,需要通过组合投资、溢价回收、协同增效3大机制和关联关系、一体开发、自求平衡3大原则来实现。实施WOD项目通常需要经过5大阶段。通过分析运行机制和操作流程,发现WOD模式在实施过程中,如操作不当,也会存在地方政府隐性债务风险。通过优化WOD运行条件、依法合规实施项目、构建全过程风险管控体系等措施,可以从一定程度上降低WOD项目的隐性债务风险。 展开更多
关键词 XOD模式 WOD模式 价值实现机制 地方政府隐性债务风险 操作流程
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北京市生态涵养区生态产品价值实现模式研究
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作者 庞维双 刘笑冰 《农业展望》 2024年第5期57-62,共6页
绿水青山就是金山银山,全面建设社会主义现代化国家离不开生态文明建设。北京市生态涵养区作为首都的生态屏障和水源保护地,蕴含着丰富的生态产品。在推动建设生态涵养区生态保护和绿色发展的关键时期,如何实现生态产品的价值是目前的... 绿水青山就是金山银山,全面建设社会主义现代化国家离不开生态文明建设。北京市生态涵养区作为首都的生态屏障和水源保护地,蕴含着丰富的生态产品。在推动建设生态涵养区生态保护和绿色发展的关键时期,如何实现生态产品的价值是目前的重要课题,尤其是实现模式路径的研究更是重要。本研究在系统阐述生态产品概念和生态产品价值实现相关理论的基础上,总结了北京生态涵养区生态产品价值实现的“土地利用优化+生态产业化”模式、“生态特色旅游产业化+成果共享”模式、“生态补偿完善化+公私合作”模式、“产权市场化+股权交易”模式、“生态修复+区域联合”模式5种模式,研究成果可为全国生态产品价值实现、乡村振兴和培育生态产业提供参考,推动实现区域经济社会发展与资源环境保护的双赢。 展开更多
关键词 生态产品 价值实现模式 生态涵养区 北京市
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为什么要重新关注工具?--基于建造模式解析的建筑学基本问题之考察 被引量:2
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作者 李海清 《新建筑》 2016年第2期4-9,共6页
基于文献研究和相关知识缺陷之察明,以近期设计实践中的工具运用为激发点,结合典型案例解析,具体探讨工具之于建筑学科的基本性、工具的不同分类方法以及工具演化的主要动因;指出建筑师与工具的关系在产品时代已发生新的转变,整合设计... 基于文献研究和相关知识缺陷之察明,以近期设计实践中的工具运用为激发点,结合典型案例解析,具体探讨工具之于建筑学科的基本性、工具的不同分类方法以及工具演化的主要动因;指出建筑师与工具的关系在产品时代已发生新的转变,整合设计指向全程管控,从而让工程实现端促进建筑谋划端做出相应调整。 展开更多
关键词 工具 建造模式 轻型建筑 工程实现 物质生产 社会生产
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基于协同效益的蓝碳增汇融资机制与路径研究
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作者 严欣恬 李杨帆 《科技管理研究》 CSSCI 2024年第8期200-205,共6页
为实现向可持续、净零排放和韧性社会过渡,亟需探索新的蓝碳融资路径,构建更加丰富的蓝碳融资模式,吸引更多潜在的投资者。梳理国内外蓝碳增汇的融资实践发现,目前蓝碳融资存在收益高度依赖碳交易、融资路径单一、蓝碳项目协同效益融资... 为实现向可持续、净零排放和韧性社会过渡,亟需探索新的蓝碳融资路径,构建更加丰富的蓝碳融资模式,吸引更多潜在的投资者。梳理国内外蓝碳增汇的融资实践发现,目前蓝碳融资存在收益高度依赖碳交易、融资路径单一、蓝碳项目协同效益融资潜力长期被忽视等问题,严重阻碍蓝碳增汇项目的发展。从蓝碳生态系统的协同效益出发,分析蓝碳项目在海岸防护、生物多样性、渔业栖息地、休闲娱乐方面的协同效益及国际上对蓝碳协同效益融资的前沿探索,提出将蓝碳协同效益纳入融资框架的新思路。建议开发“碳+协同效益”信用额的混合融资模式、结合生态环境导向的开发(EOD)模式反哺蓝碳项目,以及建立基于协同效益的蓝碳融资机制网络来推动环境资源和效益的市场化,助力实现碳达峰碳中和目标。 展开更多
关键词 蓝碳 蓝碳增汇 碳融资 协同效益 生态环境导向的开发(EOD)模式 生态产品价值实现 “双碳”目标
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“三形态说”视域下人的存在方式的历史演进及其当代启示
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作者 吴迪 冉蓉 《南阳理工学院学报》 2024年第1期91-97,共7页
人作为特殊的社会存在,个体通过与自然、社会的交换活动从而创造新的关系,以此实现人对物、对自身的占有。个体存在方式的呈现受到当下社会形态的制约,其在人的依赖关系社会、物的依赖关系社会与人的自由全面发展社会中表现出不同的特点... 人作为特殊的社会存在,个体通过与自然、社会的交换活动从而创造新的关系,以此实现人对物、对自身的占有。个体存在方式的呈现受到当下社会形态的制约,其在人的依赖关系社会、物的依赖关系社会与人的自由全面发展社会中表现出不同的特点,人实现的自我占有程度与人的解放层次在这三种形态中呈缓慢加深趋势,从人对人的支配到物对人的支配,再到人对自身的占有,即自我实现,整个演进过程也是作为个体的人的主体性逐渐展现的三个阶段。以当前国际社会为对象,社会则处于物对人的支配阶段,只有中国共产党提出的与“三形态说”一脉相承的“人类命运共同体”构想才是打破当前现状,推动人的存在方式发生变革,朝着人的自由全面发展方向努力的理论基础。 展开更多
关键词 三形态说 存在方式 历史演进 自我实现 人类命运共同体
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A Modal Identification Algorithm Combining Blind Source Separation and State Space Realization 被引量:3
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作者 Scot McNeill 《Journal of Signal and Information Processing》 2013年第2期173-185,共13页
A modal identification algorithm is developed, combining techniques from Second Order Blind Source Separation (SOBSS) and State Space Realization (SSR) theory. In this hybrid algorithm, a set of correlation matrices i... A modal identification algorithm is developed, combining techniques from Second Order Blind Source Separation (SOBSS) and State Space Realization (SSR) theory. In this hybrid algorithm, a set of correlation matrices is generated using time-shifted, analytic data and assembled into several Hankel matrices. Dissimilar left and right matrices are found, which diagonalize the set of nonhermetian Hankel matrices. The complex-valued modal matrix is obtained from this decomposition. The modal responses, modal auto-correlation functions and discrete-time plant matrix (in state space modal form) are subsequently identified. System eigenvalues are computed from the plant matrix to obtain the natural frequencies and modal fractions of critical damping. Joint Approximate Diagonalization (JAD) of the Hankel matrices enables the under determined (more modes than sensors) problem to be effectively treated without restrictions on the number of sensors required. Because the analytic signal is used, the redundant complex conjugate pairs are eliminated, reducing the system order (number of modes) to be identified half. This enables smaller Hankel matrix sizes and reduced computational effort. The modal auto-correlation functions provide an expedient means of screening out spurious computational modes or modes corresponding to noise sources, eliminating the need for a consistency diagram. In addition, the reduction in the number of modes enables the modal responses to be identified when there are at least as many sensors as independent (not including conjugate pairs) modes. A further benefit of the algorithm is that identification of dissimilar left and right diagonalizers preclude the need for windowing of the analytic data. The effectiveness of the new modal identification method is demonstrated using vibration data from a 6 DOF simulation, 4-story building simulation and the Heritage court tower building. 展开更多
关键词 MODAL Identification BLIND Source Separation State Space realizATION ANALYTIC Signal Complex modeS
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Lateral resonances in initial stressed 1-3 piezocomposites 被引量:2
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作者 张红艳 沈亚鹏 尹冠生 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第7期873-881,共9页
A theoretical analysis of the lateral resonances in 1-3 piezocomposites with poling initial stress is conducted using the Bloch wave theory. Based on the linear piezoelectricity theory, theoretical formulations that i... A theoretical analysis of the lateral resonances in 1-3 piezocomposites with poling initial stress is conducted using the Bloch wave theory. Based on the linear piezoelectricity theory, theoretical formulations that include initial stress for the propagation of acoustic plane waves are made. Numerical calculations are performed to study the effects of the initial stress on the lateral mode frequencies and the stop band. It is found that lateral mode frequencies increase with the piezoelectricity of the piezocomposites, but decrease with the poling initial stress. The influence of the initial shear stress on the lateral mode frequencies is minimal, and can thus be neglected. 展开更多
关键词 lateral modes 1-3 piezocomposites initial stress
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基于EMD-SE-LSTM模型的股指日内已实现波动率预测--以中证500指数为例 被引量:1
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作者 刘传 陈彦晖 《科技和产业》 2022年第8期385-391,共7页
由于股指波动率具有非平稳、高嘈杂、非线性等特征,而传统的预测模型在建模时要求数据平稳、线性或近似线性,所以很难精准预测股指波动率。为提高股指波动率的预测效果,采用经验模态分解(EMD)、样本熵(SE)和长短期记忆网络(LSTM)构建的... 由于股指波动率具有非平稳、高嘈杂、非线性等特征,而传统的预测模型在建模时要求数据平稳、线性或近似线性,所以很难精准预测股指波动率。为提高股指波动率的预测效果,采用经验模态分解(EMD)、样本熵(SE)和长短期记忆网络(LSTM)构建的模型对股指日内已实现波动率进行预测。以中证500指数为例,经过EMD分解得到一系列分量,再根据分量的样本熵大小进行重构,最后利用LSTM对重构后的各序列进行预测。结果表明,EMD算法对LSTM模型的预测精度有很大的提升,相较于传统模型,EMD-SE-LSTM模型在预测股指波动率时精度更高,拟合优度更好。 展开更多
关键词 经验模态分解(EMD) 长短期记忆网络(LSTM) 已实现波动率 股票指数
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