■1984~1988 - 연세대학교 이학사
■1988~1990 - 연세대학교 이학석사
■1994~1997 - Univ. of Arizona 공학박사
■낙동강유역환경청 환경영향평가 자문위원
■대한자원환경지질학회 기획이사
■대한지질공학회지 편집위원
■한국암반공학회지 편집간사
■한국암반공학회 일암논문상 수상
암반역학
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■Kulatilake, P.H.S.W., Um, J. and Pan, G. 1997. "Requirements for Accurate Estimation of Fractal Parameters for Self-Affine Roughness Profiles Using the Line Scaling Method", Rock Mechanics & Rock Engineering 30(4): 181-206.
■Kulatilake, P.H.S.W, Um, J. and Pan, G. 1998. "Requirements for Accurate Quantification of Self-affine Roughness Using the Variogram Method", Int. J. Solids and Structures 35(31-32): 4167-4189.
■Kulatilake, P.H.S.W. and Um, J. 1999. "Requirements for Accurate Quantification of Self-affine Roughness Using the Roughness-Length Method". Int. Jour. of Rock Mechanics and Mining Sci. 36(1): 1-18.
■Kulatilake, P.H.S.W., Um, J., Panda, B.B. and Nghiem, N. 1999. "Development of a New Peak Shear Strength Criterion for Anisotropic Rock Joints". ASCE, Jour of Engineering Mechanics 125(9): 1010-1017.
■Um, J. and Kulatilake, P.H.S.W. 2001. "Kinematic and block theory analyses for shiplock slopes of the Three Gorges Dam site in China". Int. Jour. Geotechnical and Geological Engineering 19: 21-42.
■Wang, M., Kulatilake, P.H.S.W., Um, J. and Narvaiz, J. 2002. "Estimation of REV size and three dimensional hydraulic conductivity tensor for a fractured rock mass through a single well packer test and discrete fracture fluid flow modeling". Int. Jour. of Rock Mechanics and Mining Sciences 39(7): 887-904.
■Kulatilake, P.H.S.W., and Um, J. 2003. "Spatial variation of cone tip resistance for the clay site at Texas A & M University". Int. Jour. of Geotechnical and Geological Engineering 21(2): 149-165.
■Kulatilake, P.H.S.W., Um, J., Wang, M., Escandon R.F. and Narvaiz, J. 2003. "Stochastic fracture geometry modeling in 3-D including validations for a part of Arrowhead East Tunnel site, California, USA". Int. Jour. of Engineering Geology 70: 131-155.
■Um, J. 2003. "A study of the sampling biases correction on joint data from 1D survey line". Tunnel and Underground Space 13(5) 344-352.
■Kulatilake, P.H.S.W., Park, J. and Um, J. 2004 "Estimation of rock mass strength and deformability in 3-D for a 30m cube at a depth of 485m at Aspo Hard Rock Laboratory, Sweden". Int. Jour. of Geotechnical and Geological Engineering 22: 313-330.
■Um, J. and Heo, I. 2005 "Measurement of rock mass geometry using the total station". J. of Geological Society of Korea 41(2): 241-251.
■Um, J., Kang, T. and Hwang, J.Y. 2005 "Rock slope stability investigation conducted on the road cut in Samrangjin-Miryang area". Economic and Environmental Geology 38(3): 305-317.
■Lee, S., Hwang, J.Y, Kim, J.S. and Um, J. 2005 "Correlation between engineering properties and mineralogy of clay sediments in the estuary of the Nakdong river". J. of Miner. Soc. Korea 18(2): 93-107