Two components central to the calculation of customer value are acquisition and retention propensities. However, while extant research has incorporated such components into different kinds of models, limited work has investigated the kinds of associations that may exist between them. In this research, we focus on the relationship between a prospective customer’s time until acquisition of a part...

In this paper, we propose a data model to manage dynamic aspects of geographic information. In our model, a geographic change is represented as an event. Three relations are defined on events: they are is-a relation, partof relation, and event-driven relation. We implemented a prototype system, and confirmed that our model is adaptable to searching dynamic aspects of geographic information base...

in this research, recognition of karstic water-bearing zones using the management of exploration data in kal-qorno valley, situated in the tepal area of shahrood, has been considered. for this purpose, the sequential exploration method was conducted using geological evidences and applying remote sensing and geoelectrical resistivity methods in two major phases including the regional and local s...