Value co-creation in the digital innovation ecosystem is of great practical significance for promoting enterprise advantages and high-quality economic development. Digitalization reshapes the logic of value co-creation. Innovation activities are no longer focused only on the internal enterprise but also occur in the ecosystem of interaction and sharing with other heterogeneous and diverse subjects. How can value co-creation be achieved between the digital innovation ecosystems and how can they be coupled between the two? Based on this problem, this paper divides the value co-creation elements of the digital innovation ecosystem into five major elements: digital strategic cognition, digital technology, new digital infrastructure, data resources, and digital innovation capabilities, and explores the coupling mechanism between the digital innovation ecosystem and value co-creation.

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Traditionally, full text retrieval over structure peerto-peer network has been implemented by inverted index by keywords. However, search based on this index scheme only support literally word match, not taking into account the meaning of words. In this paper, we present a new index scheme, inverted index by concepts, for document retrieval over structure P2P network. We introduce ontology to capture the semantic relations between words, which provide a solution for ambiguity and richness of natural language. The index scheme proposed in this paper transforms the keyword search to the match process of concepts, and implementing keyword search based on semantic. Our index scheme also avoids the intersection of inverted lists between nodes when executing multi-keyword search. Simulation experiment shows that search based on our index scheme has higher retrieval performance than that based on keyword index, and generates lower network traffic.

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