共查询到19条相似文献，搜索用时 296 毫秒
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回归系数一类线性估计的小样本性质 总被引：1，自引：0，他引：1
提出了线性模型中回归系数的一类线性估计.在均方误差矩阵(MSEM)准则和Pitman Closeness(PC)准则下,研究了这类线性估计相对于最小二乘(LS)估计的优良性.最后,讨论了当设计阵为非列满秩时,回归系数的可估函数的一类线性估计的优良性. 相似文献
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线性回归模型在电力负荷预测中的应用 总被引：1，自引：0，他引：1
中长期电力负荷预测是规划的前提和基础.以建立线性回归模型来科学预测电力负荷在未来的变化趋势及状态,通过算例分析,得出利用线性回归模型进行电力学系统中长期负荷预测取得令人满意的效果. 相似文献
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提出了一种非线性预测控制的新方法.首先基于线性微分包含理论,利用泰勒级数对系统进行线性化,通过对偏导数取最大和最小的方法构造多面体描述的线性时变系统包裹原非线性系统,然后对于多面体描述的线性不确定系统,采用多参数规划的方法建立显示模型预测控制系统.对该方法进行了仿真计算,仿真结果表明采用这种方法可以更好的描述非线性系统... 相似文献
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王一鸣 《科学学与科学技术管理》2014,(6)
对于研发活动,布什的线性模型与司托克斯的巴斯德象限模型,都在特定的历史时期对研发活动的认识以及科技政策的制定与发展等产生了很大影响。司托克斯结合案例分析提出巴斯德象限模型,打破了线性模型前半部分对于基础研究与应用研究的二分法。而在当代,研发活动出现了各种新动态,线性模型与巴斯德象限模型再演进,打破了从研究到商品化之间的二分法;结合独立型研发企业或机构的出现,提出新巴斯德象限模型,指出后学院科学中的研发活动作为一种独立产业的出现与发展,将线性模型后半部分的二分法进一步消解,最后提出了新巴斯德象限的意义与启示。 相似文献
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供应链的协调一直是人们关注的重点.在确定需求务件下,需求函数为线性时,通过选择适当数量的企业组成供应链,可以使供应链的收益达到总体最优. 相似文献
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两生产商单零售商的货架竞争与协调研究 总被引：1，自引：0，他引：1
研究单个零售商销售两个生产商的品牌产品,其中两种产品完全同质、总需求随机地依赖于总货架展示量.首先由两种产品总需求的分布函数得到每种产品的需求分布函数,然后建立了供应链系统利润最大化、品牌利润最大化和渠道利润最大化下的集中式决策模型.为了协调零售商的分散式决策与集中式决策一致,分别提出了两种回购加线性补贴合同及回购加线性补贴加利润共享合同.最后的算例表明了模型的合理性和协调合同的有效性. 相似文献
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科尔沁地区牧业生产及其可持续发展定量分析 总被引：1，自引：0，他引：1
建立包括自然要素、经济要素和技术要素作为投入的全要素牧业投入产出模型，并将之运用到科尔沁地区，以奈曼旗为例，对1949年至1980年集体所有制时期以及1980年至2003年包干到户时期的牧业生产进行了分析。研究表明，在1949年至1980年期间，牧业生产主要受到年降水量、年平均温度、牧业劳动力和6月末牲畜数量4项投入要素的影响，其中温度因子对牧业生产的驱动作用大过劳动力的作用。1980年至2003年期间，牧业生产主要受到牧业劳动力和牲畜数量投入的影响，该时期各投入要素的生产率得到显著提高，尤其是劳动力投入的作用得到加强，从而使牧业呈现出较强的增长趋势。究其原因，牲畜比例的调整与出栏率的提高是提高各投入要素的生产率的重要手段。牲畜比例的调整方向，主要是从牧养型的牲畜向圈养型的牲畜调整。从总体上看，由于劳动力与牲畜的持续扩大投入受到限制，并且牧业生产过程中技术投入的作用不明显，因此，现有牧业生产方式和结构必须进一步调整，才能满足科尔沁地区牧业可持续发展的需求。 相似文献
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Wei Zheng Hongbin Wang Changchun Hua Zhiming Zhang Hongrui Wang 《Journal of The Franklin Institute》2018,355(16):7962-7984
This paper addresses the interval type-2 fuzzy robust dynamic output-feedback control problem for a class of nonlinear continuous-time systems with parametric uncertainties and immeasurable premise variables. First, the parametric uncertainties are assumed to be a subsystem based on the control input matrix and output matrix, and described as a linear fractional. Secondly, the nonlinear continuous-time systems are described by the interval type-2 fuzzy model. Thirdly, the new dynamic output feedback controller is designed based on the interval type-2 fuzzy model and the linear fractional (parametric uncertainties), the sufficient conditions for robust stabilization are given in the form of linear matrix inequalities (LMIs). Compared with previous work, the developed methods not only have abilities to handle the fuzzy system with immeasurable premise variables but also can deal with the parametric uncertainties effectively. The results are further extended to a mobile robot case and a chemical process case. Finally, two simulation examples are performed to show the effectiveness of the propose methods. 相似文献
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In this paper, new results are established for generating tracking policies in aggregated production-inventory systems. A dynamic model is developed to characterize the evolution of targeted production, inventory and demand over time and incorporates the inventory, production and demand tracking errors as additional variables. The control variables are managerial decision variables on rate of production and advertisement. The developed model takes the form of linear system with time-varying delay. Tracking policies are then formulated and determined to ensure that the production-inventory tracking model achieves a desirable performance in terms of H∞-measure. Numerical simulation is performed to illustrate the theoretical developments. 相似文献
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《Information processing & management》2022,59(4):102954
This paper aims to propose an intrinsic partial linear modelling (IPLM) framework for characterizing the complex relationship between the response manifold-valued data and a set of explanatory variables such as age, education years, or gender. Such manifold value data are widespread in medical imaging, gesture recognition, computer vision, feature tracking, shape modeling, and others. Compared with most nonparametric and parametric models for manifold-valued data, our IPLM as a semi-parametric model contains both parametric and nonparametric components, leading to better adaptability, interpretation, fitting, and robustness. Furthermore, we propose an iterative estimation strategy to estimate unknown components in IPLM and use simulation experiments to display the performance of the proposed estimation methods. Finally, we apply the proposed IPLM to model the association between the brain subcortical region Corpus Callosum (CC) 2D shape and multiple covariates, such as age, gender, or disease diagnosis, show its wide application in estimating the continuous 2D shape trajectories and comparing the difference in different groups. 相似文献
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The distributions of linear combinations, products and ratios of random variables arise in many areas of engineering. In this note, the exact distributions of αX+βY, |XY| and |X/Y| are derived when X and Y are independent normal and Laplace random variables. 相似文献
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中国城市化和工业化对能源消费的影响研究 总被引：1，自引：0，他引：1
中国是世界上第二大能源消费国。随着中国的城市化和工业化,中国的能源消费将会进一步增加。以能源消费为因变量,以城市化、工业化和能源价格为自变量,建立多元线性回归模型,估算中国城市化和工业化对能源消费的影响。研究结果表明,GDP,工业增加值占GDP比重,城镇人口比重都会增加中国的能源消费;第三产业比重则会降低中国能源消费;另外由于技术进步和节能政策的作用,中国能源消费还存在着一个负的时间趋势。采用回归方程以中国十二五规划中城市化和工业化的部分目标为依据,对中国2015年的能源消费进行了预测,预测结果表明十二五期间中国能源消费将维持6%左右的增长速度。在此基础上,从产业结构,能源价格和节能技术等方面对中国的节能政策进行分析。 相似文献
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Robust adaptive sliding mode control for uncertain discrete-time systems with time delay 总被引：2，自引：0，他引：2
This paper focuses on robust adaptive sliding mode control for discrete-time state-delay systems with mismatched uncertainties and external disturbances. The uncertainties and disturbances are assumed to be norm-bounded but the bound is not necessarily known. Sufficient conditions for the existence of linear sliding surfaces are derived within the linear matrix inequalities (LMIs) framework by employing the free weighting matrices proposed in He et al. (2008) [3], by which the corresponding adaptive controller is also designed to guarantee the state variables to converge into a residual set of the origin by estimating the unknown upper bound of the uncertainties and disturbances. Also, simulation results are presented to illustrate the effectiveness of the control strategy. 相似文献
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《Journal of The Franklin Institute》2023,360(7):4852-4879
This paper deals with the probabilistic analysis of discrete first-order linear control models with uncertainties. For the sake of generality in our stochastic analysis, we assume that all model parameters (the initial and final states, the matrix containing the free dynamics part, and the control’s coefficient) are random variables with an arbitrary joint probability density function. We then combine some results from classical Control Theory with Probability Theory to obtain, under very general hypotheses, the first probability density function of the control and the solution, which are parametric stochastic processes. To illustrate our theoretical findings, we also show two numerical examples and a classical discrete macroeconomic model whose parameters are treated as random variables. 相似文献