Author
Phill-Seung Lee
Other affiliations: Samsung Heavy Industries, Massachusetts Institute of Technology, McGill University
Bio: Phill-Seung Lee is an academic researcher from KAIST. The author has contributed to research in topics: Finite element method & Shell (structure). The author has an hindex of 28, co-authored 104 publications receiving 2409 citations. Previous affiliations of Phill-Seung Lee include Samsung Heavy Industries & Massachusetts Institute of Technology.
Papers published on a yearly basis
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TL;DR: In this paper, a phantom-node method is developed for three-node shell elements to describe cracks, which can treat arbitrary cracks independently of the mesh mesh and may cut elements completely or partially.
256 citations
TL;DR: In this article, a simple methodology to design isotropic triangular shell finite elements based on the Mixed Interpolation of Tensorial Components (MITC) approach is presented, which performs well-established numerical tests and shows the performance of the new elements.
218 citations
TL;DR: The MITC9 element is a general nine-node shell element based on the formulation approach of using mixed-interpolated tensorial components and the use of the “best” tying points is clearly of value.
108 citations
TL;DR: In this article, a new 3-node triangular shell finite element, called the MITC3+ element, has been proposed, which is enriched by a cubic bubble function for the rotations.
105 citations
TL;DR: The transformation matrix of the CB method is enhanced considering the effect of residual substructural modes and the unknown eigenvalue in the enhanced transformation matrix is approximated by using O’Callahan's approach in Guyan reduction.
Abstract: SUMMARY In this paper, we propose a new component mode synthesis method by enhancing the Craig–Bampton (CB) method. To develop the enhanced CB method, the transformation matrix of the CB method is enhanced considering the effect of residual substructural modes and the unknown eigenvalue in the enhanced transformation matrix is approximated by using O’Callahan’s approach in Guyan reduction. Using the newly defined transformation matrix, original finite element models can be more accurately approximated by reduced models. For this reason, the accuracy of the reduced models is significantly improved with a low additional computational cost. We here present the formulation details of the enhanced CB method and demonstrate its performance through several numerical examples. Copyright © 2015 John Wiley & Sons, Ltd.
95 citations
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847 citations
TL;DR: A core neuronal population activated in all animals that exhibit parenting, as well as cell populations differentially activated in mothers and fathers, are identified, providing insights into how physiological state may affect parental behavior.
Abstract: The hypothalamus controls essential social behaviors and homeostatic functions. However, the cellular architecture of hypothalamic nuclei, including the molecular identity, spatial organization, and function of distinct cell types, is poorly understood. Here, we developed an imaging-based in situ cell type identification and mapping method and combined it with single-cell RNA-sequencing to create a molecularly annotated and spatially resolved cell atlas of the mouse hypothalamic preoptic region. We profiled ~1 million cells, identified ~70 neuronal populations characterized by distinct neuromodulatory signatures and spatial organizations, and defined specific neuronal populations activated during social behaviors in male and female mice, providing a high-resolution framework for mechanistic investigation of behavior circuits. The approach described opens a new avenue for the construction of cell atlases in diverse tissues and organisms.
681 citations
TL;DR: In this article, the effects of smoothness of basis functions on solution accuracy within the isogeometric analysis framework were investigated. And they concluded that the potential for the k-method is high, but smoothness is an issue that is not well understood due to the historical dominance of C 0 -continuous finite elements.
606 citations
01 Jan 2010
TL;DR: The work is giving estimations of the discrepancy between solutions of the initial and the homogenized problems for a one{dimensional second order elliptic operators with random coeecients satisfying strong or uniform mixing conditions by introducing graphs representing the domain of integration of the integrals in each term.
Abstract: The work is giving estimations of the discrepancy between solutions of the initial and the homogenized problems for a one{dimensional second order elliptic operators with random coeecients satisfying strong or uniform mixing conditions. We obtain several sharp estimates in terms of the corresponding mixing coeecient. Abstract. In the theory of homogenisation it is of particular interest to determine the classes of problems which are stable on taking the homogenisation limits. A notable situation where the limit enlarges the class of original problems is known as memory (nonlocal) eeects. A number of results in that direction has been obtained for linear problems. Tartar (1990) innitiated the study of the eeective equation corresponding to nonlinear equation: @ t u n + a n u 2 n = f: Signiicant progress has been hampered by the complexity of required computations needed in order to obtain the terms in power{series expansion. We propose a method which overcomes that diiculty by introducing graphs representing the domain of integration of the integrals in each term. The graphs are relatively simple, it is easy to calculate with them and they give us a clear image of the form of each term. The method allows us to discuss the form of the eeective equation and the convergence of power{series expansions. The feasibility of our method for other types of nonlinearities will be discussed as well.
550 citations