Biography:

In the past Donghee Lee has collaborated on articles with Kevin J. Maki and In Hwan Doh. One of their most recent publications is Hydroelastic impact of a wedge-shaped body. Which was published in journal Ocean Engineering.

More information about Donghee Lee research including statistics on their citations can be found on their Copernicus Academic profile page.

Donghee Lee's Articles: (4)

Hydroelastic impact of a wedge-shaped body

AbstractIn this paper a hydroelastic method for the design of marine structures is used to study the impact of a wedge-shaped body onto a calm free-surface. The method combines computational fluid dynamics and dynamic finite-element techniques to predict the hydroelastic response of a structure in the time domain. The basic idea of the method is to predict the stress field on the fluid–structure interface due to rigid-body impact, and then to transfer the information to a wet modal model. The one-way transfer of information from the fluid simulation to the structure has two important advantages with respect to a fully coupled simulation: a single rigid-body motion computation can be reused for subsequent analyses after the structure has been redesigned, and cost of the fluid dynamic simulation is not increased due to iteration which is required in coupled simulations. The maximum displacement of an elastic wedge during the impact and penetration stages are compared with published results from a fully coupled theoretical model and a fully coupled numerical solver. The present method requires approximation of the flexural added mass, and the comparison with other results shows that the approximation is satisfactory for predicting maximum displacement.

Precipitation and grain-boundary strengthening of Al-added CoCrNi medium-entropy alloys

Highlights•AlXCoCrNi exhibits an abrupt hardening with 7.7 at.% of Al.•Heterogeneous precipitation of the B2 phase leads to precipitation hardening.•Hindered grain growth by precipitation leads to grain refinement.•Grain boundary wetting in the high-energy facets of twin boundary is discussed.

Towards greener data centers with storage class memory☆

Highlights•New Storage Class Memory (SCM) technology makes it possible to turn systems on and off with minimal overhead.•Energy savings are possible by turning off idle servers while satisfying performance requirements.•The SOONN server prototype takes roughly 1.17 s to be turned on.•The ZEUS data center prototype consumes energy in proportion to user requests with configurable service of quality.•SCM should not be viewed as just a replacement of either RAM or storage.

Synergistic effect by Al addition in improving mechanical performance of CoCrNi medium-entropy alloy

Highlights•Small Aluminum addition increase the lattice constant of CoCrNi.•Al7.5CoCrNi produce a fine-grained microstructure with B2 phase precipitate.•Combination of grain refinement effect and B2 precipitate increase the yield strength.•Dislocation slip is more favorable than deformation twinning in Al7.5CoCrNi.

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