According to andrew c. nahm, what is one aspect of korean culture that was influenced by the spread of buddhism? ". . with the rise of buddhism, korea’s contacts with the outside world grew, and scholarship, arts, science and technology which were imported to korea from china, india and regions beyond brought about the enrichment of korean culture. as a result, one of the oldest astronomical charts in the world was produced, the oldest astronomical observatory called ch’ŏmsŏngdae was built, tumuli [burial mounds] architecture represented by the ssangyŏng tomb developed, and the system of doctor of medicine was established in korea. during the three kingdoms period, korea’s cultural progress in the fields of astronomy, mathematics, medicine, architecture and metallurgy reached the level of other advanced civilization of the world. . "