To prevent this, each Active Directory domain controller maintains a value called the high watermark vector (HWMV) for other domain controllers that it is replicating with.

The paper provides some improving measures, and gives a model of active pushing system based on vector space model, which can better improve the efficiency of Web information retrieval.

In order to increase accuracy in gender classification, an iterative learning approach combining support vector machine (SVM) and active appearance model (AAM) was proposed.