Furthermore, a high-accuracy algorithm of heading error compensation is presented, which is based on the compass deviation decomposition and the datum axis of orthogonal correction.

This study focus on the interactional modification of the students who are at group work by using two kinds of tasks which are called required information exchange and optional information exchange.

The research investigated the effects of the task types (required information exchange task and optional information exchange task) on the interactional modification of Chinese college students.

And through the meaningful language interaction activities and constant interactional modification, the students can acquire the target language effectively.

orthogonal signal correction.

In order to improve the interpretability of the PLS model,the orthogonal signal correction(OSC) data preprocessing method is introduced,then the OSC-PLS model for dam safety monitoring,which can preprocess original independent variables and remove signals unrelated to dependent variables,is proposed.

According to previous dam safety monitoring statistic models and focus on the defects of least square regression statistic theory, the statistic models for dam safety monitoring were put forward in the dissertation based on the partial least square square regression, orthogonal signal correction, weighted block recursive partial least squares regression, neural network.