在使用有限元法求解波动方程偏移过程中，由于未知量数目巨大，需要花费大量的计算机存储空间和计算时间。
In wave equation migration using finite element method, a great deal of computer's internal storage and computer time are used because of too many unknowns involved.
计算结果表明，QR法未知量数目少，避免了有限元、有限条法等传统方法的不足，且与有限元、有限条法分析结果基本一致。
Results show that QR-method have fewer unknown quantities, avoids the shortcomings of traditional method such as finite elements and finite strip method and the results are consistent.
资源利用的程度取决于转换任务的复杂性，需要访问的数据源的数目，以及需要处理的数据量。
The level of utilization is determined by the complexity of the transformations, the number of sources to be accessed, and the volume of data to be processed.
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