A Multiple Model Approach to Modeling Based on LPF Algorithm

CONTROL THEORY AND APPLICATION1. INTRODUCTIONMost complex industrial processes may be characterized as non-linear and non-stationary. The colltrol methodsbased on linear models have then been challenged. Modeling and control of complex nonlinear systems becomesone of the difficult problems, which persecute control theory research and application. Several methods havebeen developed for known-structure system identification, including NARMAX, Hammerstein, Wiener or alsoHammers…     

虚拟框架和模糊数学用于修正数学模型

应用中的数学模型一般需经常加以修改 ,才能满足实际要求。当一个模型已用程序实现后 ,必须设法在现有程序及其计算结果的基础上加以完善 ,才能事半功倍。为此 ,提出一种将力学中的虚拟框架位移分析方法和模糊数学相结合对数学模型进行修正的新方法。此方法被用于某化工厂的温度控制问题 ,结果表明方法简捷有效     

结合GLM与因子效应原则的贝叶斯变量选择方法

因子效应原则(效应稀疏原则、效应排序原则和效应遗传原则)经常用于评判因子设计理论与数据分析策略的合理性. 针对非正态响应的部分因子试验, 当筛选试验含有复杂的别名效应时, 提出了一种结合广义线性模型(generalized linear models, GLM)与因子效应原则的多阶段贝叶斯变量选择方法. 首先, 在广义线性模型的线性预测器中对每个变量设置一个二元变量指示器; 其次, 将因子效应原则以变量指示器的先验信息分成三个不同的阶段分别加以考虑; 然后, 利用变量指示器的后验概率识别显著性的因子效应. 最后, 仿真试验结果表明: 所提出的方法不仅能简化广义线性模型先验参数的选择, 而且能够有效地识别出非正态响应部分因子试验的显著性因子.     

Social media research: A review

Social media is fundamentally changing the way people communicate,consume and collaborate.It provides companies a new platform to interact with their customers.In academia,there is a surge in research efforts on understanding its effects.This paper aims to provide a review of current status of social media research.We discuss the specific domains in which the impacts of social media have been examined.A brief review of applicable research methodologies and approaches is also provided.     

技术因素对产出增长贡献的计量模式

系统分析技术因素对产出增长的贡献，给出了技术因素对工业增加值增长、对新增产值、对劳动生产率增长速度，以及对新增劳动生产率贡献的计量模式，为系统分析技术因素变动对产出增长的贡献提供依据。     

井间地层分形描述

用线性插值和分形插值方法建立了井间参数精细剖面模型。在相同的井点值下，修改随机数发生器的种子值，完成分形随机模拟的多次实现，然后用黑油模拟器对不同剖面模型进行动态模拟。对生成的精细剖面图进行了对比，结果表明，分形随机建模能同时考虑地层参数分布的结构性和间歇性，而分数高斯噪声（ｆＧｎ） 比分数布朗运动（ｆＢｍ） 更适合描述沉积环境变化剧烈、随机干扰强的地层。用多次实现的分形随机模型进行动态预测，对开发指标可给出最好、最坏和最可能的估计。间歇指数对ｆＧｎ 法所建模型的动态预测结果影响较大，对ｆＢｍ 影响较小， 在两端注、采井工作制度相同的情况下，用不同的间歇指数建立的ｆＢｍ 分形剖面模型的最终采收率基本不变     

采煤机调高机构的动力学分析

对采煤机调高机构的动力学分析，找出了影响调高机构工作可靠性的因素，为正确合理地设计调高机构提供了理论依据     

核电站的危机管理研究

本文论述了核电站运行过程核安全的重要性，探讨了核电站潜在危机风险的识别、评估、预防及控制问题，提出了核电站危机管理的模型和决策、反应的管理体系。     

Forecasting inflation using economic indicators: the case of France

In order to provide short‐run forecasts of headline and core HICP inflation for France, we assess the forecasting performance of a large set of economic indicators, individually and jointly, as well as using dynamic factor models. We run out‐of‐sample forecasts implementing the Stock and Watson (1999) methodology. We find that, according to usual statistical criteria, the combination of several indicators—in particular those derived from surveys—provides better results than factor models, even after pre‐selection of the variables included in the panel. However, factors included in VAR models exhibit more stable forecasting performance over time. Results for the HICP excluding unprocessed food and energy are very encouraging. Moreover, we show that the aggregation of forecasts on subcomponents exhibits the best performance for projecting total inflation and that it is robust to data snooping. Copyright © 2007 John Wiley & Sons, Ltd.