NAME: Maki Murata ADDRESS: 716C West Beaver Avenue State College, PA16801 EMAIL ADDRESS: murata@math.psu.edu TITLE OF TALK: Modularity of certain K3-surfaces ABSTRACT OF TALK: I'll give an elementary proof for showing the modularity of three particular K3-surfaces studied by F.Beukers and J.Steinstra in their paper. In the proof, $q$-series Identities and some character sums take crucial roles. ===========================================================