• 윤리연구
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• 제80호
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• pp.1-30
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• 2011

이 글은 조선왕조 제4대 군주 세종대왕의 정신세계를 고찰하는 일환으로 그에게서는 유교와 불교가 동시에 중시되었다는 점을 밝혀 보려는 것이다. 왕조실록에서는 세종이 '해동의 요순(堯舜)'으로 평가되지만, 자세히 살펴보면 부처를 숭신했던 사례들을 종종 발견할 수 있다. 특히 왕실에서 생명의 위험성이 다가오면 구병(救病)을 위한 기도행사를 펼쳤으며 선왕의 사당에는 불당까지 겸비할 것을 추구하였다. 이러한 이면에는 세종의 유불화해의식이 작용하고 있었던 것이다. 유신(儒臣)들은 숭유억불의 기조를 따라 유교문화 확장의 차원에서 부단히 척불론을 전개했다. 특히 왕실의 불사(佛事)에 대해서는 군주와 격렬한 논쟁을 벌이기도 했다. 그러나 세종은 불교의 역사성과 현재성, 그리고 자신의 종교체험 등에 유의하여 그 적폐를 제거하면서도 불교 자체의 존재가치를 긍정하였다. 그렇다고 유교사상을 내세워 불교를 비난하거나 불교정신을 따라 유교를 경시하는 것도 아니었다. 즉 그는 유교를 높이면서도 불교를 버릴 수 없는 것으로 보고, 또 불교를 긍정하면서도 유교적인 삶의 태도를 중시했다. 현실적 삶의 태도로서는 유교윤리를 추구하고 생사 초월의 신앙적 측면으로는 불교를 높이며 융화해가는 입장을 보인 것이다. 특히 생사문제 등 인간으로서의 한계의식이 깊어질 때는 유교의 천명사상이나 제사의례뿐만 아니라 부처에의 믿음으로 위안을 찾을 수 있다고 보았다. 세종에서 유불화해의식의 절정은 선왕을 모시는 사당 문소전에 반드시 불당이 함께 있어야 한다는 모습으로 나타났다. 그와 같은 화해의식이 작용하게 되는 원인으로는 첫째 유교와 불교는 모두 왕조국가의 기조를 튼튼히 하는 데에 긴요하다고 인식되었다는 점, 둘째 기도에 대한 감응을 얻으며 안심입명의 안정감을 가지게 되었다는 점, 셋째 인간 평등의 가치관이 중시되고 있었다는 점 등을 말할 수 있다. 그리고 세종 유불화해의식이 가지는 의의로서는 ① 사람들의 정신적 상황 그대로를 긍정하여 평화적 삶의 기반을 제고시킬 수 있다는 것, ② 도덕적인 삶과 종교적인 삶의 포괄성을 높일 수 있다는 것, ③ 여러 가지 사회적 대립형상을 예방하는 데에 기여한다는 점 등을 들 수 있다.

• 논리연구
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• 제17권2호
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• pp.287-322
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• 2014

분석의 역설을 처음으로 명확하게 자각하고, 이를 회피할 방안을 제시한 사람은 무어(G. E. Moore)이다. 여기서는 이 역설의 해결책을 무어식의반-언어적 노선과 이에서 벗어나 있는 노선으로 나누어 제시한다. 후자에는 개념의 특징 및 종류, 명제의 구조, 비동등성 관계에 주목해서 역설을 회피하려는 전략이 있다. 본 논문의 일차적인 목적은 주요 역설해결책을 기술하고 그 분류를 제시하는 것이지만, 이와 더불어 또한 각 해결 전략의 한계를 논하도록 하겠다. 그런데 이런 논의를 효율적으로 전개하려면, 먼저 무어의 분석이론을 재구성하는 일이 필요하다. 무어의 분석이론은, 단지 역사적인 중요성뿐 아니라, 고전적 분석의 전형을 이룬다는 점에서도 관심의 대상이 되기에 충분하다. 또한 분석의 역설이 고전적 분석과 같이 특정 유형의 분석에만 해당한다는 주장에 반대하여 넓은 범위의 분석에서 발생한다고 주장하겠다. 그러나 더불어 이런 상황이 분석의 무용성을 보여주는 것은 아니라고 주장하겠다.

• Advances in materials Research
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• 제12권1호
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• pp.43-65
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• 2023

Free vibration analysis of power law and sigmoidal sandwich plates made up of functionally graded materials (FGMs) has been carried out using finite element based higher-order zigzag theory. The present model satisfies all-important conditions such as transverse shear stress-free conditions at the plate's top and bottom surface along with continuity condition for transverse stresses at the interface. A Nine-noded C0 finite element having eleven degrees of freedom per node is used during the study. The present model is free from the requirement of any penalty function or post-processing technique and hence is computationally efficient. The present model's effectiveness is demonstrated by comparing the present results with available results in the literature. Several new results have been proposed in the present work, which will serve as a benchmark for future works. It has been observed that the material variation law, power-law exponent, skew angle, and boundary condition of the plate widely determines the free vibration behavior of sandwich functionally graded (FG) plate.

• Advances in nano research
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• 제16권1호
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• pp.27-40
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• 2024

This work is the first of its kind to integrate Mindlin's theory with analytical methods in order to produce an exact solution to a specific vibration issue as well as a bending problem involving a nanoplate that is supported by a viscoelastic foundation. The plate is exposed to the simultaneous effects of a compressive load in the plate plane and a force operating perpendicular to the plane of the nanoplate. In addition, the flexoelecity effect is included into the plate. The strain gradient component is taken into consideration while calculating the plate equilibrium equation using the nonlocal theory and Hamilton's principle. The free vibration and static responses of the nanoplate seem to be both real and imaginary components because of the appearance of the viscoelastic drag coefficient of the viscoelastic foundation. This study also shows that when analyzing the mechanical response for nanostructure, taking into account the flexoelectricity effect and the influence of the nonlocal parameter, the results will be completely different from the case in which this parameter is ignored. This indicates that it is vital to take into consideration the effects of nonlocal parameters on the nanosheet structure while also taking into consideration the effect of flexoelectricity.

• Structural Engineering and Mechanics
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• 제90권5호
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• pp.517-530
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• 2024

This paper presents a new four-unknown equivalent single layer (ESL) refined plate theory for the buckling analysis of functionally graded (FG) rectangular plates with all simply supported edges and subjected to in-plane mechanical loading conditions. The present model accounts for a parabolic variation of transverse shear stress over the thickness, and accommodates correctly the zero shear stress conditions on the top and bottom surfaces of the plate. The material properties are supposed to vary smoothly in the thickness direction through the rules of mixture named power-law gradation. The governing equilibrium equations are formulated based on the total potential energy principle and solved for simply supported boundary conditions by implementing the Navier's method. A numerical result on elastic buckling using the current theory was computed and compared with those published in the literature to examine the accuracy of the proposed analytical solution. The effects of changing power-law exponent, aspect ratio, thickness ratio and modulus ratio on the critical buckling load of FG plates under different in-plane loading conditions are investigated in detail. Moreover, it was found that the geometric parameters and power-law exponent play significant influences on the buckling behavior of the FG plates.

• 복식
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• 제27권
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• pp.27-40
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• 1996

1.It was recorded at "Dong Gook Tong Gam" of King "Jang Soo" that "Sim-Eui" in Korea was first introduced from China at the reign of King, "Moon Ja"(491,A.D), Go Goo Ryo. 2."Sim-Eui" was worn as a mourning dress during the period of "Go Ryo" and as a concanical robe of Confucian, a ceremonial dress at home and for the rules of etiquettes during Cho Sun Dunasty. 3.Several theories about the construction and the using services of "Sim-Eui" are obseved and summerized. 4.Mr. Kyu-soo Park gives a definition to "Sim-Eui" as a Fortune of Heaven & Earth, the Constellation of the Cosmic Dual Forces, the Revolution of the Four Seasons, a dignified mien & the Way of a Man of Virtue and Virtue of the golden Mean. 5.I observed the concrete measurements of the each parts of "Sim-Eui" by the construction method of Kyu-Soo Park. 6.The Symbolic Meaning following the Idea of Mr. Chung, Hyun. describes well the line of thinking in our nation, and Idea of Loyalty & Filial Piety, a Man of Virtue and the Virtue of the Golden Mean. 7.As described above, I dare insist of the fact that the Construction Theory of "Sim-Eui" by Kyu-Soo Park during the letter period of Chosun Dynasty is full of our national manners and cus-toms with symbolizing meaning, construction's exquisiteness, clothes' materials and it's size most suitable to our people, to the exclusion of the defects in "Sim-Eui" of China and Japan.

• Smart Structures and Systems
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• 제20권3호
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• pp.369-383
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• 2017

In this work, the effects of moisture and temperature on free vibration characteristics of functionally graded (FG) nanobeams resting on elastic foundation is studied by proposing a novel simple trigonometric shear deformation theory. The main advantage of this theory is that, in addition to including the shear deformation influence, the displacement field is modeled with only 2 unknowns as the case of the classical beam theory (CBT) and which is even less than the Timoshenko beam theory (TBT). Three types of environmental condition namely uniform, linear, and sinusoidal hygrothermal loading are studied. Material properties of FG beams are assumed to vary according to a power law distribution of the volume fraction of the constituents. Equations of motion are derived from Hamilton's principle. Numerical examples are presented to show the validity and accuracy of present shear deformation theories. The effects of hygro-thermal environments, power law index, nonlocality and elastic foundation on the free vibration responses of FG beams under hygro-thermal effect are investigated.

• Steel and Composite Structures
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• 제30권1호
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• pp.13-29
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• 2019

This work presents the buckling investigation of functionally graded plates resting on two parameter elastic foundations by using a new hyperbolic plate theory. The main advantage of this theory is that, in addition to including the shear deformation effect, the displacement field is modelled with only four unknowns and which is even less than the first order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT) by introducing undetermined integral terms, hence it is unnecessary to use shear correction factors. The governing equations are derived using Hamilton's principle and solved using Navier's steps. The validation of the proposed theoretical model is performed to demonstrate the efficacy of the model. The effects of various parameters like the Winkler and Pasternak modulus coefficients, inhomogeneity parameter, aspect ratio and thickness ratio on the behaviour of the functionally graded plates are studied. It can be concluded that the present theory is not only accurate but also simple in predicting the critical buckling loads of functionally graded plates on elastic foundation.

• Steel and Composite Structures
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• 제37권6호
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• pp.695-709
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• 2020

The buckling properties of a single-layered graphene sheet (SLGS) are examined using nonlocal integral first shear deformation theory (FSDT) by incorporating the influence of visco-Pasternak's medium. This model contains only four variables, which is even less than the conventional FSDT. The visco-Pasternak's medium is introduced by considering the damping influence to the conventional foundation model which modeled by the linear Winkler's coefficient and Pasternak's (shear) foundation coefficient. The nanoplate under consideration is subjected to compressive in- plane edge loads per unit length. The impacts of many parameters such as scale parameter, aspect ratio, the visco-Pasternak's coefficients, damping parameter, and mode numbers on the stability investigation of the SLGSs are examined in detail. The obtained results are compared with the corresponding available in the literature.

• Structural Engineering and Mechanics
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• 제64권6권
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• pp.737-749
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• 2017

A new quasi-3D higher shear deformation theory (quasi-3D HSDT) for functionally graded plates is proposed in this article. The theory considers both shear deformation and thickness-stretching influences by a hyperbolic distribution of all displacements within the thickness, and respects the stress-free boundary conditions on the upper and lower surfaces of the plate without using any shear correction factor. The highlight of the proposed theory is that it uses undetermined integral terms in displacement field and involves a smaller number of variables and governing equations than the conventional quasi-3D theories, but its solutions compare well with 3D and quasi-3D solutions. Equations of motion are obtained from the Hamilton principle. Analytical solutions for buckling and dynamic problems are deduced for simply supported plates. Numerical results are presented to prove the accuracy of the proposed theory.