Um, Yongnam. 1999."Multiple Input, Faithfulness, and Uniform Exponence." In 1999 Mid-America Linguistics Conference Papers, ed. by Michael Henderson. Lawrence, KS: University of Kansas Press.

Um, Yongnam. 1999. "Paradigmatic Leveling of Irregular Verbs in Korean Dialects: Its Implications for Representations." In Harvard Studies in Korean Linguistics, vol. 8, ed. by Susumu Kuno et al., 194–208. Cambridge, MA: Harvard University and Seoul: Hanshin.

Um, Yongnam. 1997. "A Moraic Account of Stem-Final Tonal Alternation in Middle Korean." In Proceedings of the Fourth Seoul International Conference on Linguistics, 295–304. Seoul: Hankwuk Munhwasa

Um, Yongnam. 1997. "A Case of Paradigm Leveling in Middle Korean: Derived Length vs. Underlying Length." In Harvard Studies in Korean Linguistics, vol. 7, ed. by Susumu Kuno et al., 225–40. Cambridge, MA: Harvard University and Seoul: Hanshin.

Um, Yongnam. 1996. "Tone in Middle Korean: Lexicalization and Underspecification." Korean Journal of Linguistics 21(1/2).348–71.

Um, Yongnam. 1995. "On the Autonomy of the Moraic Level and the Prosodic Domain for Morafication: Asymmetry between Declension and Conjugation." In Harvard Studies in Korean Linguistics, vol. 6, ed. by Susumu Kuno et al., 138–53. Cambridge, MA: Harvard University and Seoul: Hanshin.

Um, Yongnam. 1991. "Areal Characteristics of the Languages in Meso-America." In Buffalo Papers in Linguistics 91–02, ed. by Fengxiang Li, Heather L. Weber, Robert Van Valin Jr., and Lindsay Whaley, 80–119. Buffalo, NY: State University of New York at Buffalo.

Um, Yongnam. 1999. "Multiple Input, Faithfulness, and Uniform Exponence," 1999 Mid-America Linguistics Conference, October 15–16, 1999, University of Kansas, Lawrence, Kansas.

Um, Yongnam. 1999. "Paradigmatic Leveling of Irregular Verbs in Korean Dialects: Its Implications With Respect to Representations," Eighth Harvard International Symposium on Korean Linguistics, July 16–18, 1999, Harvard University, Cambridge, MA.

Um, Yongnam. 1998. "An Optimality Theoretic Account of Korean Causative/Passive Allomorphy," Linguistic Association of Korea, May 30, 1998, Kwangju University, Kwangju, Korea.

Um, Yongnam. 1997. "Another Look at Rhythm Rules in Middle Korean," 31st Annual Linguistic Conference of the Linguistic Institute of Seoul National University, December 6, 1997, Seoul National University, Seoul, Korea.

Um, Yongnam. 1997. "Tone Shift and the Penultimate Position in the Kyengsang Dialects of Korean," Linguistic Society of Korea, October 18, 1997, Hanyang University, Ansan, Korea.

Um, Yongnam. 1997. "A Moraic Account of Stem-Final Tonal Alternation in Middle Korean," Fourth Seoul International Conference on Linguistics, August 11–15, 1997, Seoul, Korea.

Um, Yongnam. 1997. "A Case of Paradigm Leveling in Middle Korean: Derived Length vs. Underlying Length," Seventh Harvard International Symposium on Korean Linguistics, July 11–13, 1997, Harvard University, Cambridge, MA.

Um, Yongnam. 1995. "Tone in Middle Korean: Lexicalization and Underspecification," 1995 International Conference on Linguistics, Marking the 20th Anniversary of the Linguistic Society of Korea, July 3–7, 1995, Hanyang University, Seoul, Korea.

Um, Yongnam. 1995. "On the Autonomy of the Moraic Level and the Prosodic Domain for Morafication: Asymmetry between Declension and Conjugation," Sixth Harvard International Symposium on Korean Linguistics, January 13–15, 1995, Harvard University, Cambridge, MA.

Um, Yongnam. 1994. "Prosodic Structure and Reduplication in Mimetics of Korean," Ninth International Conference on Korean Linguistics, July 20–22, 1994, Centre for Korean Studies, SOAS, University of London, London, England. (With Kyung-Sook Min.)

Um, Yongnam. 1994. "Cases for Segment as Sub-Syllabic Constituent in Korean," Ninth International Conference on Korean Linguistics, July 20–22, 1994, Centre for Korean Studies, SOAS, University of London, London, England.

Um, Yongnam. 1991. "Some Queries Concerning Vowel Quantity in Korean," Working Papers Colloquium of the Niagara Linguistics Club, November 16, 1991, State University of New York at Buffalo, Buffalo, NY.