In this paper, we describe ongoing research in three DL projects that build upon a common foundation – the 5S DL framework. In each project, we extend the 5S framework to provide specifications for a particular type of DL service and/or system – finally, moving towards a DL reference model. In the first project, we are working on formalizing content-based image retrieval services in a DL. In th...

In the structure of DL-proline, C5H9NO2, the molecules are connected via classical intermolecular N-H...O hydrogen bonds involving the amine and carboxyl groups [N...O = 2.7129 (15) and 2.8392 (16) A], and form chains along the b-axis direction and parallel to (-101). The chains are linked into sheets via weak non-classical hydrogen bonds. The conformation of the molecule and its packing are no...