通过现场实测，获取基础数据。建立合理的数学模型，对实测数据进行反演计算。
It needs to measure, get basic data, found suitable mathematics model, numerical simulation analysis, and the results are credibility and accurate.
因此，还需要一些额外的运营基础架构项目用于计量和收费，例如获取使用数据的消息服务。
Some additional operational infrastructure items are required for metering and billing, however, such as messaging services to capture the usage data.
DB 2 Express - C：获取IBM DB 2数据库服务器的免费版本，这是中小型企业应用开发的一个极好基础。
DB2 Express-C: Get a free version of the IBM DB2 database server, an excellent foundation for application development for small and medium business.
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