Using Graph Databases

Data in High Energy Physics (HEP) usually consist of complext complex data structures stored in relational databases and files with internal schema. Such architecture exhibits many shortcomings, which could be fixed by migrating into Graph Database storage. The paper describes basic principles of the Graph Database together with an overview of existing standards and implementations. The usefulness and usability are demonstrated using the concrete example of the Event Index of the ATLAS experiment at LHC in two approaches as the full storage (all data are in the Graph Database) and meta-storage (a layer of schema-less graph-like data implemented on top of more traditional storage). The usability, the interfaces with the surrounding framework and the performance of those solutions are discussed. The possible more general usefulness for generic experiments’ storage is also discussed.

An Investigation of the Relationship between Color Choice and Depression Measured by the Beck Depression Inventory

The relationship between self-reported depression and color preference was investigated. It was proposed that a cognitive schema would be activated affecting negatively that pan of the environment selected for cognitive preference. When requested to select a series of preferred colors, the 72 undergraduates scoring above 10 on the Beck Depression Inventory tended to choose black or brown. It is believed that internal schema represented in 3 questions may be reflected in color choice(s).