By analyzing Porter's Diamond Model theory and combining with regional logistics characteristics and national conditions of China, this paper constructs an evaluation model and establishes a corresponding index system of regional logistics competitiveness. Based on this index system, this paper evaluates the regional logistics competitiveness on a national scale with Factor Analysis Method, the evaluation result is consistent with the actual condition in China. Finally, the logistics competitiveness of Jiangxi province is specially analyzed, and some useful advices are given for the local government to make corresponding decisions.

The Improved Diamond Model's Application in the Evaluation of Regional Logistics Competitiveness

Aerodynamic lift on sports balls is typically measured in wind tunnels. Wind tunnel measurements may have measurable differences with ball drag occurring in play. Measurements under game conditions have been attempted, but are difficult to interpret from the data scatter and are not controlled. The following considers lift measurements from a ball propelled through static air in a laboratory setting. High speed light gates were used to measure lift. Lift was observed to depend on the ball speed, roughness, stitch height, and orientation.This article explores a non-linear partial least square (NLPLS) regression method for wind tunnel measurements of sports balls based on Landsat Thematic Mapper (TM) data. Two schemes, leave-one-out (LOO) cross validation (scheme 1) and split sample validation (scheme 2), are used to build models. For each scheme, the NLPLS model is compared to a linear partial least square (LPLS) regression model and multivariant linear model based on ordinary least square (LOLS). This research indicates that an optimized NLPLS regression mode can substantially improve the estimation accuracy of wind tunnel measurements of sports balls.

http://www.aicit.org/JDCTA/ppl/JDCTA1621PPL.pdf

Measurement of Sports Balls Based on Optimization of Multivariable Linear Partial Least Square Regression Model

This paper categorizes the current studies on definition of regional competition and maps out the major points of view. It also discusses the relating concepts of regional competition.

Wang Bing

Papers

Review on Regional Competition Studies