Based on reliability analysis of frame structure, in this paper, the relative difference quotient methods is used for optimization of the frame structure, and a iteration scheme to find the optimum solution is presented.

Research of optimization design of structures with discrete variables based on RDQA and sequential two-level algorithm

Research of optimization design of structures with discrete variables based on RDQA and improved GA

A hybrid algorithm for topology optimization of trusses with discrete variables is developed which combines relative difference quotient algorithm with chaos optimization.

Linear combination forecast based on relative error criterion;

The model is used to analyze the relative error of forecast and to forecast the exploitable geological ore reserves of Miaogou Mine in 2007.

The calculation methods of pH and relative error were studied in different acid-base solution.

Study on Controlling Principles and Methods of Halftone Dot Accretion and Relative Contrast Control;

The different charecteistics of the prints with different screen rulings are detail analysed,such as solid density,dot size,light spectrum,chromaticity of Lab,relative contrast,and dot gain.

The meaning of four parameters in printing quality control was introduced,of which were solid density,dot gain,relative contrast,and trapping percentage.