Ayutthaya–Lan Na War (1441–1474) Ayutthaya–Lan Na War (1441–1474) The Ayutthaya–Lan Na War, was a border conflict that took place between 1441 and 1474. It started when the southern kingdom of Ayutthaya invaded the northern kingdom of Lan Na in 1441 and continued with periodic breaks until 1474. Lan Na achieved limited territorial gains but was weakened by internal power struggles and losses sustained during the conflict. Ayutthaya formed what is now the central and southern parts of modern Thailand while Lan Na approximated northern Thailand. During the 15th century the Ayutthaya Kingdom fought frequent wars against the Lan Na Kingdom in the north, the
Lhasa (computing) input and display chemical structures. Lhasa (computing) In computing, Lhasa () refers to two different applications. Lhasa is a Japanese computer program used to "unpack" or decompress compressed files in LHA, ZIP, and other formats. It is also the name of a computer program developed in the research group of Elias James Corey at the Harvard University Department of Chemistry which uses AI techniques to discover sequences of reactions which may be used to synthesize a compound. LHASA in this case is an acronym for Logic and Heuristics Applied to Synthetic Analysis. This program was one of the first to