• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제30회 추계학술대회
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• pp.160-166
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• 1999

Nonlinear characteristics of the hydrodynamic journal bearing with circumferentially groove are analyzed numerically considering cavitation region, when an external sinusoidal shock is given to the system. The oil film force is obtained by solving the finite width universal Reynolds equation at each time step. Frequency response function and journal orbit obtained from both linear and nonlinear bearing simulations are compared with each other. The vibration response of the journal is different from the expectation obtained from the linear analysis as increase the vibration amplitude of external disturbance. Therefore, the linear theory is not adequate, and the nonlinear calculation such as used in this research is needed to design safety rotor systems.

• 한국수학사학회지
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• 제17권3호
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• pp.73-92
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• 2004

본 연구에서는 브루너의 이론에서 처음 등장하여 수학과 교수$.$학습 방안을 구성하는데 주요한 도구가 되어온 '기본개념'을 둘러싼 다양한 고찰을 다룬다. 기본개념의 주요한 특성 가운데 한 가지는 그 성립과정이 수학사적 전개와 조응한다는 점이다. 따라서 수학교육을 위한 내용과 방법을 구성할 때 수학사는 아주 유용하고도 중요한 토대로서 작용한다는 것을 기본개념의 탐색과 관련하여 다룬다. 그리고 기본개념으로서 평균값을 지도하는 방안을 모형으로 제시하도록 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권9호
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• pp.1998-2016
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• 2012

Reliable spectrum sensing algorithm is a fundamental component in cognitive radio. In this paper, a non-cooperative spectrum sensing algorithm which needs only one cognitive radio node named CORDIC (Coordinate Rotation Digital Computer) Jacobi based method is proposed. The algorithm computes the eigenvalues of the sampled covariance of received signal mainly by shift and additional operations, which is suitable for hardware implementation. Based the latest random matrix theory (RMT) about the distribution of the limiting maximum and minimum eigenvalue ratio, the relationship between the probability of false alarm and the decision threshold is derived. Simulations and discussions show the method is effective. Real captured digital television (DTV) signals and Universal Software Radio Peripheral (USRP) are also employed to evaluate the performance of the algorithm, which prove the proposed algorithm can be applied in practical spectrum sensing applications.

• 혜화의학회지
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• 제10권2호
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• pp.167-177
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• 2002

Objectives : There are a lot of food used herb medicine among the people in order to cure diseases. A medicinal gruel is the easiest and most universal among alimmentotherapy. The purpose of this thesis is to understand a medicinal gruel therapy. Methods: I researched the definition, history, ingredients, application and special feature. Result and conclusion : A medicinal gruel therapy is alimmentotherapy for diseases prevent and diseases treatment which get mixed with her medicine and rice, based on oriental medicine theory. A medicinal gruel therapy was put on record in ${\ll}$A historical book${\gg}$. A medicinal gruel therapy can be used in chronic diseases, convalescent stage, assistant treatment for acute disease, disease prevention, aging prevention, diet food and substitute food for breakfast.

• Steel and Composite Structures
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• 제22권6호
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• pp.1445-1463
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• 2016

The effects of moisture and temperature on buckling of laminated composite cylindrical shell panels are investigated both numerically and experimentally. A quadratic isoparametric eight-noded shell element is used in the present analysis. First order shear deformation theory is used in the present finite element formulation for buckling analysis of shell panels subjected to hygrothermal loading. A program is developed using MATLAB for parametric study on the buckling of shell panels under hygrothermal field. Benchmark results on the critical loads of hygrothermally treated woven fiber glass/epoxy laminated composite cylindrical shell panels are obtained experimentally by using universal testing machine INSTRON 8862. The effects of curvature, lamination sequences, number of layers and aspect ratios on buckling of laminated composite cylindrical curved panels subjected to hygrothermal loading are considered. The results are presented showing the reduction in buckling load of laminated composite shells with the increase in temperature and moisture concentrations.

• 한국언어정보학회지:언어와정보
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• 제13권2호
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• pp.1-27
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• 2009

This paper examines the (a)symmetries in the realization of focused subjects and objects in Korean. Through rating experiments, we demonstrate that native speakers' judgments of acceptability of sentences containing case-marked or case-ellipsed subjects and objects are sensitive to the contrastiveness strength and the discourse accessibility of focused arguments. However, our experiments also show that focused subjects exhibit stronger preference for explicit case marking over case ellipsis and that contrastiveness strength and discourse accessibility have weaker influence on the case marking and ellipsis of focused subjects compared to focused objects. We propose an account of variable case marking that is capable of subsuming both the similarities and differences between focused subjects and objects under the universal theory of markedness. In particular, it is shown that the similarities between focused subjects and objects are predicted by the proposed account based on the contrastiveness strength and the discourse accessibility of focused arguments and that the differences between focused subjects and objects follow naturally from the relative markedness of focus as subjects.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2019년도 춘계종합학술대회
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• pp.261-262
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• 2019

이 연구의 목적은 국가중요무형문화재 제92호 '강선영류 태평무' 교육을 체계적으로 보완하여 보편적 학습설계를 위한 구성주의 관점의 인지적 도제 학습의 적용가능성을 모색하는 것이다. 이를 위하여 전통무용 교육전문가 10명을 선정하여 개방형 설문과 포커스 그룹 인터뷰 실시를 통해 의견을 수렴하였으며, 순환적 과정을 통해 모형 개발을 실행하고 형성적 순환에 중점을 두는 설계기반연구(DBR)를 수행하였다. 그 결과 전통적 도제에서의 교육적 한계점을 밝히고, 도제 원리의 특수성을 검토하여 구성주의 관점의 인지적 도제학습 관점에 기초한 한국 전통무용의 보편적 학습설계를 새롭게 개발하였다.

• Bulletin of the Korean Chemical Society
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• 제8권3호
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• pp.150-155
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• 1987

A new method of measurement of pore volume distribution in a porous material by adsorption of gases is proposed. In the newly proposed method the use of spherical molecules with relatively large molecular weight as adsorbates is strongly recommended to eliminate the troubles caused by stereospecificity and low boiling point of widely used $N_2$. It is also claimed that the universal t-curves that have been widely used since proposed by de Boer et al. must be replaced by the flat-surface isotherms that can be derived from the theory proposed by Chang et al. The results of analysis of pore volume distribution based on the method described in this paper are found to be reasonable and satisfactory.

• 인문언어
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• 제2권2호
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• pp.163-182
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• 2002

In Origin of the German Mourning Play(1928), the critic Waltre Benjamin strongly criticized the German Romantic concept of the symbol, according to which the universal and ideal can be represented wholly in the particular and empirical by virtue of an ontological connection between them. Yet this criticism did not prevent Benjamin, in his epistemological preface to the book, from availing himself of the same monadological model (derived from Leibniz and Goethe) on which the Romantics had relied. Although he specifically rejected their insistence on the fusion of the phenomenal and the ideal in the symbol, his own theory of Ideas and their presentation in criticism nonetheless requires just such a fusion. This is not immediately apparent for two reasons: first, Benjamin proposes, in contrast to Platonic and Romantic theory, that Ideas themselves are subject to historical change, and therefore not capable of manifesting themselves fully in any given historical phenomenon; and second, he proposes that Ideas rather than phenomena are monads, individually representing the whole of the world in which they participate. The task of the critic, which Benjamin calls Darstellung("presentation"), consists in revealing Ideas by reducing historical phenomena to their constituent elements and reassembling those elements in what amounts to a mosaic of quotations. But this task is possible only if the critic has a preconception of the Idea he is trying to reveal-a possibility that Benjamin′s theory of knowledge does not allow for at all- or if he can discern the Ideas in the individual phenomenal fragments from which he creates his mosaic, in which case phenomena and Ideas must be related monadologically after all. Benjamin seems to admit the latter possibility in a cryptic sentence in the manuscript draft of his preface to the Origin, but he does not do so in the final printed version. Thus he effectively deprived the critic of an epistemological basis for the presentation of Ideas.

• Structural Engineering and Mechanics
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• 제49권5호
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• pp.569-595
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• 2014

In this paper, a novel semi-energy finite strip method (FSM) is developed based on the concept of first order shear deformation theory (FSDT) in order to attempt the post-buckling solution for thin and relatively thick functionally graded (FG) plates under uniform end-shortening. In order to study the effects of through-the-thickness shear stresses on the post-buckling behavior of FG plates, two previously developed finite strip methods, i.e., semi-energy FSM based on the concept of classical laminated plate theory (CLPT) and a CLPT full-energy FSM, are also implemented. Moreover, the effects of aspect ratio on initial post-buckling stiffness of FG rectangular plates are studied. It has been shown that the variation of the ratio of initial post-buckling stiffness to pre-buckling stiffness ($S^*/S$) with respect to aspects ratios is quite independent of volume fractions of constituents in thin FG plates. It has also been seen that the universal curve representing the variation of ($S^*/S$) with aspect ratio of a FG plate demonstrate a saw shape curve. Moreover, it is revealed that for the thin FG plates in contrast to relatively thick plates, the variations of non-dimensional load versus end-shortening is independent of ceramic-metal volume fraction index. This means that the post-buckling behavior of thin FG plates and the thin pure isotropic plates is similar. The results are discussed in detail and compared with those obtained from finite element method (FEM) of analysis. The study of the results may have a great influence in design of FG plates encountering post-buckling behavior.