The Ohio Department of Education has taken control of eight charter schools and will close four for poor academic performance, among them one enrolling about 138 children in Canton. The charter schools are among eight that had been sponsored by the Portage County Educational Service Center. When the center closed this year, Ohio law required the Ohio Department of Education to assume sponsorship so the schools would not lose oversight and close immediately.The Ohio Department of Education found “overall poor performance over the years” in four of the charter schools, spokesman John Charlton said.