This paper presents three strategies for modeling the regional empirical Tm （the weighted mean tem- perature of the atmosphere） to obtain more accurate determinations in a regional empirical model that is better ada...This paper presents three strategies for modeling the regional empirical Tm （the weighted mean tem- perature of the atmosphere） to obtain more accurate determinations in a regional empirical model that is better adapted to the geographical and climatic characteristics of the applied area. The proposed models utilize data from four radiosonde stations in Guangxi, at Nanning, Guilin, Wuzhou and Baise, over an 11 month period （from Jan. to Nov. of 2011 ）. The experimental results demonstrated the following： （1） there is no significant展开更多
美国哈佛大学商学院教授迈克尔·波特(Michael E. Porter)所提出的国家竞争优势理论,为国际贸易理论的研究提供了新的研究视角及分析工具。其中,钻石体系是国家竞争优势理论的核心概念,目前已在产业竞争优势的研究中产生了深远影响...美国哈佛大学商学院教授迈克尔·波特(Michael E. Porter)所提出的国家竞争优势理论,为国际贸易理论的研究提供了新的研究视角及分析工具。其中,钻石体系是国家竞争优势理论的核心概念,目前已在产业竞争优势的研究中产生了深远影响。新形势下各国国际贸易政策的变化以及新冠疫情的大流行使得钻石体系的适用性大大受限。本文将对钻石体系的核心四要素加以评述,探讨其理论价值与贡献,并为钻石模型在新形势下的应用提供改进建议。展开更多
The characteristics of three GPS kinematic data processing models, Least Squares （LS）, Kalman filtering and filtering are discussed and their advantages and disadvantages are compared. With observational data and p...The characteristics of three GPS kinematic data processing models, Least Squares （LS）, Kalman filtering and filtering are discussed and their advantages and disadvantages are compared. With observational data and pertinent data processing software, the applicable condition, context and effect of the three models are experimented. Results show that when the mobile platform is in uniform motion, the accuracy of the three models are almost equal; when the mobile platform is in stochastic acceleration, the accuracy of H∞ filtering model is superior to that of LS, while that of Kalman filtering is the worst.展开更多
基金supported by the National Natural Foundation of China(4106400141071294)+1 种基金the Natural Science Foundation of Guangxi(2012GXNSFAA053183)Guangxi Key Laboratory of Spatial Information and Geomatics(1103108-06)
文摘This paper presents three strategies for modeling the regional empirical Tm （the weighted mean tem- perature of the atmosphere） to obtain more accurate determinations in a regional empirical model that is better adapted to the geographical and climatic characteristics of the applied area. The proposed models utilize data from four radiosonde stations in Guangxi, at Nanning, Guilin, Wuzhou and Baise, over an 11 month period （from Jan. to Nov. of 2011 ）. The experimental results demonstrated the following： （1） there is no significant
文摘美国哈佛大学商学院教授迈克尔·波特(Michael E. Porter)所提出的国家竞争优势理论,为国际贸易理论的研究提供了新的研究视角及分析工具。其中,钻石体系是国家竞争优势理论的核心概念,目前已在产业竞争优势的研究中产生了深远影响。新形势下各国国际贸易政策的变化以及新冠疫情的大流行使得钻石体系的适用性大大受限。本文将对钻石体系的核心四要素加以评述,探讨其理论价值与贡献,并为钻石模型在新形势下的应用提供改进建议。
基金the National Natural Foundation of China (No.40574002)the Natural Foundation of Guang Xi Zhuang Autonomous Re-gion (No. 0728097)
文摘The characteristics of three GPS kinematic data processing models, Least Squares （LS）, Kalman filtering and filtering are discussed and their advantages and disadvantages are compared. With observational data and pertinent data processing software, the applicable condition, context and effect of the three models are experimented. Results show that when the mobile platform is in uniform motion, the accuracy of the three models are almost equal; when the mobile platform is in stochastic acceleration, the accuracy of H∞ filtering model is superior to that of LS, while that of Kalman filtering is the worst.
