It is calculated through the translation of casualty and direct loss into a normal index, which is a method of simplicity and applicability.

灾级大小是将一次灾害中死亡、伤害和直接经济损失数折算成规范化指数后计算出来的。其方法简单易行，且适用性强。

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The damage diagnosis method based on vibration testing can be further classified as a direct system identification method, a damage index method and a finite element model modification method.

其中基于振动测试的损伤诊断法可进一步分为直接的系统识别方法、损伤指标法和有限元模型修正法。

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The method of memory data management is proposed for the data model been presented. Multilayer index with groups, direct index with local ID and temp index is used for all kinds of efficient query.

针对该工程模型，提出了内存数据管理方法，建立了多层分组索引、基于局部ID的直接索引和临时索引，以满足各种高效查询的需要。

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