• Journal of KSNVE
• /
• v.5 no.2
• /
• pp.207-213
• /
• 1995

A new predictor-corrector explicit time integration algorithm is presented for solving structural dynamics problems. The basis of the algorithm is the implicit generalized-.alpha. method recently developed by the authors. Like its implicit parent, the explicit generalized-$\alpha$ method is a one- parameter family of algorithms in which the parameter defines the high-frequency numerical dissipation. The algorithm can be utilized effectively for linear and nonlinear structural dynamics calculations is which numerical dissipation is needed to reduce spurious oscillations inherent in non-dissipative time integration methods used to solve wave propagation problems.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.22 no.4
• /
• pp.315-322
• /
• 2009

This paper presents a novel numerical method based on the extended moving least squares finite difference method(MLS FDM) for solving 1-D Stefan problem. The MLS FDM is employed for easy numerical modelling of the moving boundary and Taylor polynomial is extended using wedge function for accurate capturing of interfacial singularity. Difference equations for the governing equations are constructed by implicit method which makes the numerical method stable. Numerical experiments prove that the extended MLS FDM show high accuracy and efficiency in solving semi-infinite melting, cylindrical solidification problems with moving interfacial boundary.

• Journal of the Korean Geotechnical Society
• /
• v.18 no.4
• /
• pp.207-214
• /
• 2002

A constitutive model was implemented in ABAQUS code, The constitutive equation can model the behavior for overall range of strain level from small to large deformation, which is based on anisotropic hardening rule and total stress concept. The formulation includes (1) finite strain formulation on the basis of Jaumann rate, (2) implicit stress integration and (3) consistent tangent moduli. Therefore, the mathematical background was established in order that large deformation analysis can be performed accurately and efficiently with the anisotropic constitutive model. Companion paper(Jeon et al., 2002) will contain the large deformation analysis results of examples with the constitutive model using ABAQUS.

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.21 no.2
• /
• pp.225-231
• /
• 2012

Drop simulations of the board level in the flip chips with solder joints have been highlighted for years, recently. Also, through the study on the life prediction of thermal fatigue in the flip chips considering underfill, its importance has been issued greatly. In this paper, dynamic analysis using the implicit method in the Finite Element Analysis (FEA) is carried out to assess the factors effecting on flip chips considering underfill. The design parameters are size and thickness of chip, and size, pitch and array of solder ball with composition of Sn1.0Ag0.5Cu. The board systems by JEDEC standard is modeled with various design parameter combinations, and through these simulations, maximum yield stress and strain at each chip are shown at the solder balls. Modal analysis is simulated to find out the relation between drop impact and vibration of the board system.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.23 no.6
• /
• pp.407-413
• /
• 2011

Reliability analysis of pile type quaywalls were done by using response surface method. Pier structures have implicit form of limit state function since they are flexible in motion, which is different from gravity type quaywalls. To solve a reliability analysis problem with implicit limit state function, response surface method was applied. Reliability indices of structure under seismic load were found for pier structures Then, they were compared with those found by simulation method. In numerical analysis, both the inclined type and vertical type were analyzed.

• Journal of Gifted/Talented Education
• /
• v.13 no.2
• /
• pp.1-22
• /
• 2003

The purpose of the present study is to examine implicit capabilities of giftedness by Korean adults and to validate the features of giftedness by asking the gifted students in science, liberal arts, and ordinary. Existing researches have problems as follows; they will make a high error when we distinguish gifted students who applied to various changeable conditions because they only use total score without their sub-attributes and because they designed from the viewpoint of age. And they are difficult and complex for students to understand. This study is composed of two parts, Study 1 and Study 2. In study 1, we examined and analyzed the Korean's implicit concept of giftedness to 328 adults. In Study 2, the features of the Koreans' implicit concept for giftedness were validated to 1154 students in science, liberal arts, and ordinary. Giftedness features and patterns were identified by factor analysis. In the last place, we suggested the distribution of T-value scale for each feature of giftedness.

• Coupled systems mechanics
• /
• v.1 no.4
• /
• pp.361-379
• /
• 2012

This paper presents a fully coupled three-dimensional solver for the analysis of interaction between pulsatile flow and large deformation structure. A partitioned time marching algorithm is employed for the solution of the time dependent coupled discretised problem, enabling the use of highly developed, robust and well-tested solvers for each field. Conservative transfer of information at the fluid-structure interface is combined with an effective multi-predict-correct iterative scheme to enable implicit coupling of the interacting fields at each time increment. The three-dimensional unsteady incompressible fluid is solved using a powerful implicit time stepping technique and an ALE formulation for moving boundaries with second-order time accurate is used. A full spectrum of total variational diminishing (TVD) schemes in unstructured grids is allowed implementation for the advection terms and finite element shape functions are used to evaluate the solution and its variation within mesh elements. A finite element dynamic analysis of the highly deformable structure is carried out with a numerical strategy combining the implicit Newmark time integration algorithm with a Newton-Raphson second-order optimisation method. The proposed model is used to predict the wave flow fields of a particular flow-induced vibrational phenomenon, and comparison of the numerical results with available experimental data validates the methodology and assesses its accuracy. Another test case about three-dimensional biomedical model with pulsatile inflow is presented to benchmark the algorithm and to demonstrate the potential applications of this method.

• Korean Journal of Culture and Social Issue
• /
• v.26 no.3
• /
• pp.283-301
• /
• 2020

In Korean society, words related to misogyny are being created and spread out in the Internet communities and the Internet news posts comments. This study was conducted to investigate if exposure to misogynistic words affects misogynistic attitudes toward women. Study 1 examined the relationship between exposure of misogynistic words (the number of misogynistic words known and the level of Internet comments viewed) and explicit misogynistic attitudes. As a result, the greater the exposure of misogynistic words, the less explicit misogynistic attitudes were found among men. The result can be explained as a desensitization of stimuli caused by repetitive exposure to media. In Study 2, experiments were conducted to manipulate the exposure of misogynistic words and to identify the relationship between implicit misogynistic attitudes through implicit association tests. Results of analysis show that implicit misogyny attitude is stronger as male participants are exposed to misogynistic words. The finding of this study suggests that explicit and implicit attitudes toward misogyny can diverge. It also implies that the exposure to misogynistic words can affect men's and women's attitudes in a different manner.

• Korean Journal of Culture and Social Issue
• /
• v.21 no.1
• /
• pp.97-118
• /
• 2015

The aim of the present study was to examine moderating effects of self-esteem on perceived transgression wrongness and forgiveness defined as Worthington and Scherer's (2004) emotional forgiveness and decisional forgiveness when receiving apologies. Data collected from 861(486 males, 375 females) Korean college students were analyzed with hierarchical multiple regression analysis. The results were as follows. First, on emotional forgiveness, the two-way interaction effect of perceived transgression wrongness and explicit self-esteem was significant. And on decisional forgiveness, the two-way interaction effect of perceived transgression wrongness and explicit self-esteem was significant. The effect of perceived transgression wrongness on emotional and decisional forgiveness for individuals with high explicit self-esteem is stronger than its impact for individuals with low self-esteem. These findings show that explicit self-esteem may play an important role in forgiveness in college students through interactions with perceived transgression wrongness. Second, on emotional forgiveness, the three-way interaction effect of perceived transgression wrongness, explicit self-esteem, and implicit self-esteem was significant. The effect of perceived transgression wrongness on emotional forgiveness for individuals with high explicit self-esteem having high implicit self-esteem is stronger than its impact for individuals with low explicit self-esteem having high implicit self-esteem. These findings show that discrepancies between implicit and explicit self-esteem are detrimental to emotional forgiveness. But, on decisional forgiveness, the three-way interaction effect of perceived transgression wrongness, explicit self-esteem, and implicit self-esteem was not significant. Implications and limitations of this study were discussed.

• Journal of The Korean Association of Information Education
• /
• v.15 no.4
• /
• pp.635-644
• /
• 2011

This research analyzed the brainwave activities and brain hemispherity to find out any implications to design the connections between the activities of the brain function and the computerized arithmetic addition in two difficulty levels: easy: 1-5 vs. hard: 6-9. Thus, in developing the brain based math learning for the computer education by implicit association test(IAT) indicated the significant results for the exclusive brain location and the brain hemispherity on the theta, alpha, low alpha, beta brainwaves by QEEG analysis. The results of this study physiologically supported the theoretical background for the computerized math learning skills as well as the math learning material development. It shows the difficulty levels of math information education and the brain activities on cognitive process of the learner continued on the possible investigation of the brain science.