Abstract: A method for knowledge representation and deduction of service logic includes: generating, based on a knowledge representation model, a semantic graph corresponding to conceptual-layer service logic, where the semantic graph includes one or more types of nodes and edges for connecting the one or more types of nodes, and the nodes include at least a node of a variable type; generating, based on the semantic graph and a physical table to which a service object is mapped, an instance graph, where the instance graph includes the nodes and edges in the semantic graph; generating executable code based on a service logic relationship between the nodes in the instance graph; and determining, based on the executable code and a data instance corresponding to a node whose in-degree is 0 in the instance graph, a data instance corresponding to each node in the instance graph.

Abstract: A method for modulating the piasmonic resonance of a noble metal nanoparticle to enhance the luminescence of an oxygen sensitive dye; an oxygen sensitive composition that includes a nanostructure comprising a noble metal particle and an oxygen sensitive dye: a substrate having a surface coated with the oxygen sensitive composition; methods and sensors for determining oxygen concentration using the oxygen sensitive composition.