Jeong-Gi Um, Ph.D., is a professor of geological engineering at the Pukyong National University. He has over 20 years of experience in rock mechanics, rock engineering, and probabilistic and numerical methods. Background includes broad education and the corresponding academic degrees received in geology, geophysics, and mining & geological engineering. Experience contains intensive research activities and consulting conducted in the academic and industry areas of geological and geotechnical engineering. Publication lists reflect extensive achievement in these fields.

PROFESSIONAL MEMBERSHIP

International Society for Rock Mechanics and Rock Engineering (ISRM)

International Association for Engineering Geology and the Environment (IAEG)

American Geophysical Union (AGU)

Korean Society for Rock Mechanics and Rock Engineering (KSRM)

Korean Society of Engineering Geology (KSEG)

Korean Society of Economic and Environmental Geology (KSEEG)

SELECTED PUBLICATIONS

Ryu, S., J. Um and J. Park, 2020, Estimation of strength and deformation modulus of the 3-D DFN system using the distinct element method, Tunnel and Underground Space, 30, 15-28

Lee, D. and J. Um, 2017, A study on applicability of equivalent continuum flow model in DFN media, Tunnel and Underground Space, 27, 303-311.

Park, H., J. Lee, K. Kim and J. Um, 2016, Assessment of rock slope stability using GIS-based probabilistic kinematic analysis, Engineering Geology, 203, 56-69.

Han, J. and J. Um, 2016, Effect of joint aperture variation on hydraulic behavior of the 2-D DFN system, Tunnel and Underground Space, 26, 283-292.

Um, J., Y. Noh and Y. Choi, 2015, A random Cantor set as a measure of the statistical homogeneity of fractured rock masses, Geosystem Engineering, 18, 117-125

Woo, I., J. kim, G. Lee, H. Park and J. Um, 2013, Evaluation of the impact of pyrite oxidation on rock characteristics and environment by laboratory tests, Environmental Earth Sciences, 69, 1821-1829.

Park, H., J. Um, I. Woo and J. Kim, 2012, Application of fuzzy set theory to evaluate the probability of failure in rock slopes, Engineering Geology, 125, 92-101.

Kim, Y., Y. Lee, S. Lee and J. Um, 2011, Development of an in situ direct shear test apparatus and its field application, Tunnel and Underground Space, 21, 181-191.

Cukur, D., G. Lee, J. Um, D. Kim and J. Kim, 2009, Northern Barbados accretionary prism: structure, deformation, and fluid flow interpreted from 3-D seismic and well-log data, Island Arc, 18, 642-660.

Cho, T., J. Suk, S. Lee and J. Um, 2008, Investigation of rock slope failures based on physical model study, The Journal of Engineering Geology, 18, 447-457.

Kang, T. and J. Um, 2007, Risk assessment of the road cut slopes in Gyeoungnam based on multiple regression analysis, The Journal of Engineering Geology, 17, 393-404.

Um, J., T. Cho and S.J. Kwon, 2006, A Study on the quantified criteria in determining the geostructural domain of fractured rock mass, Tunnel and Underground Space, 16, 26-37.

Kulatilake, P.H.S.W., J. Park and J. Um, 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, Geotechnical and Geological Engineering, 22, 313-330.

Kulatilake, P.H.S.W., J. Um, M. Wang, R. Escondon and J. Narvaiz, 2003, Stochastic fracture geometry modeling in 3-D including validations for a part of Arrowhead East Tunnel, California, USA, Engineering Geology, 70, 131-155.

Wang, M., P.H.S.W. Kulatilake, J. Um and J. Narvaiz, 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, International Journal of Rock Mechanics and Mining Sciences, 39, 887-904.

Um, J. and P.H.S.W. Kulatilake, 2001, Kinematic and block theory analyses for shiplock slopes of the Three Gorges dam site in China, Geotechnical and Geological Engineering, 19, 21-42.

Kulatilake, P.H.S.W., J. Um, B.B. Panda and N. Nghiem, 1999, Development of a new peak shear strength criterion for anisotropic rock joints, Journal of Engineering Mechanics, 125, 1010-1017.

Kulatilake, P.H.S.W., 1999, J. Um, 1999, Requirements for accurate quantification of self-affine roughness using the roughness length method, International Journal of Rock Mechanics and Mining Sciences, 36, 5-18.

Kulatilake, P.H.S.W., J. Um and G. Pan, 1998, Requirements for accurate quantification of self-affine roughness using the variogram method, International Journal of Solid and Structure, 35, 4167-4189

Kulatilake,P.H.S.W., J. Um and G. Pan, 1997, Requirements for accurate estimation of fractal parameters for self-affine roughness using the line scaling method, Rock Mechanics and Rock Engineering, 30, 181-206.

Kulatilake, P.H.S.W., W. He, J. Um and H. Wang, 1997, A Physical model study of jointed rock mass strength under uniaxial compressive loading, International Journal of Rock Mechanics and Mining Sciences, 34, 692-693.