Title: Syzygy Theoretic Approach to Horrocks-type Criteria for Vector Bundles

Abstract: This paper studies a variant of Horrocks criteria for vector bundles mainly through a syzygy theoretic approach. In this spirit we begin with describing various proofs of the splitting criteria for ACM and Buchsbaum bundles, giving new sights of the structure theorem. Our main result gives a structure theorem of quasi-Buchsbaum bundles on ${\mathbb P}^n$, which characterizes the null-correlation bundle. Also, the quasi-Buchsbaum bundles on ${\mathbb P}^3$ with simple cohomologies are classified in terms of standard system of parameters.