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24 results on '"Hong, Kwan Young"'

18. Verification of Linear FE Model for Nonlinear SSI Analysis by Boundary Reaction Method

Author

Lee Gye Hee, Hong Kwan Young, Lee Eun Haeng, and Kim Jae Min

Subjects
Coupling, Nonlinear system, Engineering, Discretization, business.industry, Soil structure interaction, Mathematical analysis, Boundary (topology), Structural engineering, business, Seismic wave, Finite element method, Seismic analysis
Abstract

In this paper, a coupling scheme for applying finite element analysis(FEA) programs, such as, LS-DYNA and MIDAS/Civil, to a nonlinear soil structure interaction analysis by the boundary reaction method(BRM) is presented. With the FEA programs, the structure and soil media are discretized by linear or nonlinear finite elements. To absorb the outgoing elastic waves to unbounded soil region as much as possible, the PML elements and viscous-spring elements are used at the outer FE boundary, in the LS-DYNA model and in MIDAS/Civil model, respectively. It is also assumed that all the nonlinear elements in the problem are limited to structural region. In this study, the boundary reaction forces for the use in the BRM are calculated using the KIESSI-3D program by solving soil-foundation interaction problem subjected to incident seismic waves. The effectiveness of the proposed approach is demonstrated with a linear SSI seismic analysis problem by comparing the BRM solution with the conventional SSI solution. Numerical comparison indicates that the BRM can effectively be applied to a nonlinear soil-structure analysis if motions at the foundation obtained by the BRM for a linear SSI problem excluding the nonlinear structure is conservative.

Published
2014

24. Evaluation of Factors Affecting Illumination Intensity in Lightwand Endotracheal Intubation.

Author

Hong KY, Lee JE, Hwang HJ, Sim WS, Park HJ, and Lee JY

Subjects
Humans, Retrospective Studies, Light, Neck, Lighting, Intubation, Intratracheal
Abstract

Background/aim: A lightwand is a stylet with a light bulb at its tip that can be used to guide intubation by confirming the illumination through the anterior neck. We aimed to determine the factors affecting the illumination intensity during lightwand endotracheal intubation., Patients and Methods: We retrospectively collected data from 180 patients who underwent lightwand endotracheal intubation. We recorded illumination intensity on a 5-point scale. The patients were categorized into weak (score <3) and bright (score ≥3) groups based on the illumination intensity scale score., Results: A total of 176 patients were analyzed, of whom 125 (71.1%) were enrolled in the bright group, and 51 (29.0%) were enrolled in the weak group. Multivariable logistic regression analysis revealed that an increased body mass index (BMI) and mask ventilation grade were associated with light intensity. For mask ventilation, moderate vs. easy (p=0.010) and difficult vs. easy (p=0.008) were associated with the weak group. Receiver operating characteristic curve analysis showed that BMI ≥24.6 kg/m 2 was correlated with the weak group., Conclusion: BMI ≥24.6 kg/m 2 or mask ventilation grade above moderate indicates increased odds of weak illumination intensity in lightwand intubation. Pre-intubation examination of these factors helps increase the chances of successful intubation., (Copyright © 2024, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)

Published
2024
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