Combined state and parameter estimation for a bilinear state space system with moving average noise     

Xiao Zhang  Ling Xu  Feng Ding  Tasawar Hayat 《Journal of The Franklin Institute》2018,355(6):3079-3103

This paper considers the identification problem of bilinear systems with measurement noise in the form of the moving average model. In particular, we present an interactive estimation algorithm for unmeasurable states and parameters based on the hierarchical identification principle. For unknown states, we formulate a novel bilinear state observer from input-output measurements using the Kalman filter. Then a bilinear state observer based multi-innovation extended stochastic gradient (BSO-MI-ESG) algorithm is proposed to estimate the unknown system parameters. A linear filter is utilized to improve the parameter estimation accuracy and a filtering based BSO-MI-ESG algorithm is presented using the data filtering technique. In the numerical example, we illustrate the effectiveness of the proposed identification methods.  相似文献   

New insights in stability analysis of delayed Lotka–Volterra systems     

Xu-Guang Li  Jun-Xiu Chen  Silviu-Iulian Niculescu  Arben Çela 《Journal of The Franklin Institute》2018,355(17):8683-8697

Most of the reported Lotka–Volterra examples have at most one stability interval for the delay parameters. Furthermore, the existing methods fall short in treating more general case studies. Inspired by some recent results for analyzing the stability of time-delay systems, this paper focuses on a deeper characterization of the stability of Lotka–Volterra systems w.r.t. the delay parameters. More precisely, we will introduce the recently-proposed frequency-sweeping approach to study the complete stability problem for a broad class of linearized Lotka–Volterra systems. As a result, the whole stability delay-set can be analytically determined. Moreover, as a significant byproduct of the proposed approach, some Lotka–Volterra examples are found to have multiple stability delay-intervals. To the best of the authors’ knowledge, such a characterization represents a novelty for having some insights in the population dynamics: in some situations, a longer maturation period of species is helpful for the stability of a population system.  相似文献   

Corrigendum to “Crossing the innovation threshold through mergers and acquisitions” [Res. Policy 44 (2015) 698–710]     

Elena Cefis  Orietta Marsili 《Research Policy》2018,47(9):1870

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Technology adoption,consumer inattention and heuristic decision-making: Evidence from a UK district heating scheme     

Andrew Burlinson  Monica Giulietti  Giuliana Battisti 《Research Policy》2018,47(10):1873-1886

This paper contributes to the debate on the energy efficiency paradox according to which consumers fail to adopt cost-effective, energy efficient technologies over less efficient technologies and therefore fail to reduce energy consumption. Both traditional and behavioural theories are used to investigate the decision-making process of residential consumers with empirical evidence based upon a specially designed quasi-experimental survey of 784 households on the decision to connect to a district-heating system, a more energy efficient alternative to individual heating systems. The results suggest an internal discount rate of around 36 per cent for homeowners, a signal that consumers undervalue future energy costs. We also find the household’s decision to be negatively affected by years of payback up to around 7–8 years. Our findings suggest that neglecting consumer inattention and heuristics can lead to biases which cast doubt on the existence of the energy efficiency paradox. We believe that these results help to explain why some consumers are unlikely to invest in energy efficient technology, particularly those on low incomes.  相似文献   

Novice mathematics teachers create themselves     

Orna Schatz Oppenheimer  Nurit Dvir 《Teacher Development》2018,22(2):210-228

This study presents a qualitative research based on three narratives written by novice mathematics teachers. We examine their unique professional world during their first year of work. The methodology of narrative framework, on which this article is based, helps to gain better understanding of the need for novice mathematics teachers to have pedagogical knowledge. Findings reveal three themes of pedagogical knowledge: the attitude of novice teachers toward students with difficulties in mathematics; parents’ expectations of and involvement with novice mathematics teachers; teacher–student relations. The implications of the findings show that novice mathematics teachers are required to have not only content knowledge of mathematics but also, and above all, pedagogical knowledge. The implications of this study enable reassessment of emphases required in training mathematics teachers, as well as the assistance and support they need, especially as they launch their careers.  相似文献   

互联网金融缓解科技初创企业融资困境的模式分析——源于深圳的经验     

郭茂佳  晏景瑞 《科技管理研究》2018,(4):86-90

系统总结深圳借助互联网金融缓解科技初创企业融资困境的五种模式,旨在完善金融市场体系、打破银企信息不对称。  相似文献   

医药专利分析领域研究热点探测及对中药专利分析的启示     

潘玮  孙伟伟  张世玉  王伟 《现代情报》2017,37(3):148-152

中药专利是中药产业技术实力的重要体现,对其进行有效的分析和挖掘,将对政府部门、科研机构和中药企业产生重要意义。研究运用Citespace Ⅲ软件对CNKI数据库和Pubmed数据库中专利分析方法应用于医药领域的研究热点进行探测,并绘制了研究热点的时区分布和聚类分布可视化图谱。通过对研究热点的分析,发现中药专利分析研究在整个研究领域中占有重要地位。为了进一步深化和发展中药专利分析研究,一方面根据中药专利分析研究热点,对现有的中药专利分析研究进行了梳理和归纳;另一方面,参考和借鉴专利分析方法在其它医药领域的研究热点,从研究方法、研究目标和研究对象3个方面对未来中药专利分析的研究进行了展望。  相似文献   

场域论视域下我国体医融合的实然困境与应然进路     

李彦龙  陈德明  聂应军  常凤 《南京体育学院学报(社会科学版)》2021,35(1):36-43

体医融合是健康中国战略实施的关键技术，为加快推进我国体医融合，促进全民科学健身与全民健康深度融合，基于布迪厄场域论，以“场域—资本—惯习”三要素为逻辑主线，对我国体医融合的实然困境与应然进路进行分析。体医融合实然困境包括：体育与医疗的结构差异、关系孱弱与体医融合的生成障碍，形成体医融合的场域壁垒；医疗部门经济资本受损、体疗制度资本乏力、复合型人力资本匮乏造成体医融合资本制约；传统医疗文化及医疗技术依赖，固化体医融合惯习。提出构建大健康网络， 打破体医融合场域壁垒；改革经济资本走向、完善制度资本、加强复合型人力资本培养，优化体医融合资本；消除体医融合惯习误识、摈除医疗技术依赖惯习的应然进路。  相似文献   

论金初“南冠诗人”的忠义精神     

张建伟  范婷婷 《大同职业技术学院学报》2010,(5)

金朝初年,被囚禁的滕茂实、朱弁、洪皓、司马朴等南冠诗人忠于宋朝,坚守节操。朱弁等使臣期盼宋室中兴,致力于两国和好,常以苏武自勉。司马朴等人客死他乡,朱弁、洪皓十余年后全节返宋,只求苟安的南宋朝廷对他们的表彰中隐含着排挤。这些宋臣未能被故国重用,相反,他们的忠义节操受到了金人的崇敬,成为南北文化融合后形成的中原文化的一部分。  相似文献   

艾思奇对马克思主义群众观的实践及启示     

鲁国超 《保山学院学报》2010,(3):1-4

艾思奇坚信人民群众是推动历史发展的主体,深知在旧中国只有中国人民才是砸碎旧世界、建立新中国的真正力量。为了使马克思主义真正成为中国人民的思想武器,他从实际出发,潜心研究,发表了《大众哲学》,体现了艾思奇对马克思主义群众观的积极实践。我们党要长期执政并推动中国特色社会主义建设事业不断取得新发展,必须认真实践马克思主义群众观,强化人民群众是发展主体的认识,提高人民群众的自我发展能力,实现人民群众的全面发展,保持党同人民群众的血肉联系。  相似文献