QR decomposition can improve the condition number of a matrix and then improve the numerical stability.
QR分解可以改善矩阵条件数，从而提高数值稳定性。
This paper discusses the numerical stability and time step criterion for the finite element solution of viscoelastic problems.
本文讨论粘弹性问题用有限元求解时的数值稳定性及步长判据。
Smoothness constraints can be incorporated into the objective function, which can improve the numerical stability of the inversion.
详细推导了粗糙度函数，并将粗糙度函数加入到模型函数中去，实现了模型的光滑约束；
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