Data exchange between heterogeneous schemas is a difficult problem that becomes more acute if the source and target schemas are from different data models. The data type of the objects to be exchanged can be useful information that should be exploited to help the data exchange process. So far little has been done to take advantage of this in inter model data exchange. Using a common data model ...

introduction: in recent years, most environmental evaluation studies have managed the heterogeneity of preferences among individuals. differing sensitivities are the basis for targeted communication programs and promotions. as consumer preferences and sensitivities become more diverse, it becomes less and less efficient to consider the society in the aggregate. in this research, we will show ho...

ultrasound imaging is a popular and noninvasive tool frequently used in the diagnoses of liver diseases. a system to characterize normal,fatty and heterogeneous liver, using textural analysis of liver ultrasound images, is proposed in this paper. the proposed approach isable to select the optimum regions of interest of the liver images. these optimum regions of interests are analyzed by two lev...

Object-oriented data models organize objects according to common properties into classes. Similarly, some object oriented systems organize classes into metaclasses which define common properties of their class instances. But in none of them metaclasses can be used to define common properties of instances of their instances. Meta-classes in VODAK, a distributed object-oriented database system de...