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Lishui, China

Deng Y.H.,Lishui College
Advanced Materials Research | Year: 2014

When quantity of superfluous survey equals to zero,and sum of residuals squared with weight equals to zero,variance estimation of unit weight is found that it doesn't only equal to zero,but also equals to any plus real number.Then,a sort of imitative example was put forward to support the new conclusion.So,this paper has perfected variance estimation of unit weight based on theory and application in some aspect, and,has solved that,when quantity of superfluous survey equals to zero,we can still assess accuracy based on number. © (2014) Trans Tech Publications, Switzerland. Source


Deng Y.,Lishui College
Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 | Year: 2012

Literature [1] studied the principle formulas of level surveying, but its theory is not strict enough. So, in this paper, further research is made to obtain more strict formulas, and proves that formula in literature [1] can completely replace homologous formula of this paper in practice. © the authors. Source


Deng Y.,Lishui College
Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 | Year: 2012

GM(1,1) models are widely applied to many fields including surveying engineering.Their researches are growing,and study on boundary conditions of GM(1,1) models is an important work.Based on least squares method,two sorts of new and better methods about boundary condition of GM(1,1) models were put forward in this paper.Finally,author proved that some models are equals,and proposed some advices.These results are important to GM(1,1) models and distortion monitoring of surveying engineering. © the authors. Source


There are some losed datum or mistake datum when GM(1,1)model deals engineering matter,so equidistance GM(1,1) model is restricted and choosing non-equidistance GM(1,1) model is very necessary.The backgroung value functions of modeling research on non-equidistance GM(1,1) model is studied and is considered to be wrong,and strict backgroung value functions is advanced in the paper.The theory and practice approach of the strict method is introduced particularly.Feasibility and validity of this mothod is gained through surveying and mapping engineering. So, the paper has some significance of theory and practice. © (2011) Trans Tech Publications. Source


Deng Y.,Lishui College
Applied Mechanics and Materials | Year: 2011

It is availability to improve GM(1,1) forecasting precision based on the combination of GM(1,1) model and linear regression.But,it is no good to deal with no-saltation points always based on linear regression,and deal with saltation points based on equidistant GM(1,1) model.So,in the paper,it has definite meaning of theory and practice to advance a new GM(1,1) combination model to solve the problem.Finally some examples are given in the paper. © (2011) Trans Tech Publications. Source

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