The two-volume proceedings set LNCS 16638-16639 contains the AICom2 (International Symposium on Artificial Intelligence Computing and Communication) symposium papers presented at 19th International Conference on Knowledge Science, Engineering and Management, KSEM 2026, held in Beijing, China, during July 17–19, 2026.The 73 papers included in these proceedings were carefully reviewed and selected from 695 submissions. These papers have been organized in the following topical sections:1.AI Computing Models2. AI Communications3. AI Knowledge and Data Integration,4. AI security5. AI Application6. Large Language Model