• 논리연구
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• 제16권1호
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• pp.45-59
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• 2013

타카시 야기사와는 그의 저서 Worlds and Individuals: Possible and Otherwise에서 양상실재론에 대한 중요한 반론들에 대해 자신의 이론이 루이스의 이론보다 더 성공적으로 재반박할 수 있다는 것을 보임으로써 자신의 이론이 더 낫다고 주장한다. 특히 그는 자신이 양상 시제(modal tenses)를 도입함으로써 양상실재론에 대한 중요한 반론들에 대해 균일한 방식으로 재반박할 수 있다고 주장한다. 이 논문에는 나는 루이스 역시 현실 세계에서의 존재와 가능세계에서의 존재를 구별함으로써 야기사와와 동일한 방식으로 피콕의 반론에 대해 재반박할 수 있다는 것을 보이고, 반 인와겐에 대한 야기사와의 재반박은 성공적이지 않다는 것을 보인다. 결론적으로 나는 야기사와는 자신의 이론이 루이스의 이론보다 더 낫다는 것을 보이는데 실패했다고 주장한다.

• 대한수학회지
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• 제40권4호
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• pp.695-708
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• 2003

We study the existence of solutions for overdetermined PDE systems that admit prolongation to a complete system. We reduce the problem to a Pfaffian system on a submanifold of the jet space of unknown functions and then express the integrability conditions in terms of the coefficients of the original system. As possible applications we present some local problems in CR geometry: determining the CR embeddibility into spheres and the existence of infinitesimal CR automorphisms.

• Communications for Statistical Applications and Methods
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• 제11권2호
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• pp.413-418
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• 2004

Statistically illiterate people seem to believe that there are some strategies for choosing winning numbers in lottery. One seemingly plausible strategy is to select the hot numbers which most frequently appeared in the past. In this article we investigate the existence of hot numbers in the Korean national lottery called Lotto. A numerical method is proposed to estimate the exact sampling distribution of test statistic for checking the existence of hot numbers among 45 possible numbers of choice.

• Journal of Multimedia Information System
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• 제8권2호
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• pp.131-142
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• 2021

This paper traces the process of constructing a new one-dimensional chaotic map, and will provide a simple application in color image encryption. The use of Sarkovskii's theorem will make it possible to determine the existence of chaos and restrict all conditions to ensure the existence of this new sequence. In addition, the sensitivity to initial conditions will be proved by Lyapunov's index value. Similarly, the performance of this new chaotic map will be illustrated graphically and compared with other chaotic maps most commonly used in cryptography. Finally, a humble color image encryption application will show the power of this new chaotic map.

• 한국수학사학회지
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• 제30권2호
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• pp.87-100
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• 2017

The ontological status of Newtonian space-time has been debated under the name of substantivalism-relationism controversy. The debates between the two parties are concerned with the nature of existence of space-time. Substantivalism maintains that the points of space-time have existence analogous to material substance. Relationism claims that space-time should be understood as the framework of possible spatio-temporal relations between bodies. Newtonian space is considered as a three dimensional entity in accordance with our geometric common sense. Yet given that the concept of motion is defined as the change of position throughout time, it is possible to interpret space-time as a 4 dimensional entity. In this essay, substantivalist-relationist debate is considered within the context of non-relativistic 4 dimensional space-time theory. This essay attempts to clarify the dispute over the ontology of space-time by elucidating the relationship between the ontology of space-time, motion, and space-time symmetry.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2001년도 제41차 추계학술대회
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• pp.91-91
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• 2001

• Journal of applied mathematics & informatics
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• 제38권5_6호
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• pp.375-406
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• 2020

The anti-predator factor due to fear of predator in eco- epidemiological models has a great importance and cannot be evaded. The present paper consists of a modified Lesli-Gower predator-prey model with contagious disease in the predator population only and also consider the fear effect in the prey population. Boundedness and positivity have been studied to ensure the eco-epidemiological model is well-behaved. The existence and stability conditions of all possible equilibria of the model have been studied thoroughly. Considering the fear constant as bifurcating parameter, the conditions for the existence of limit cycle under which the system admits a Hopf bifurcation are investigated. The detailed study for direction of Hopf bifurcation have been derived with the use of both the normal form and the central manifold theory. We observe that the increasing fear constant, not only reduce the prey density, but also stabilize the system from unstable to stable focus by excluding the existence of periodic solutions.

• 대한수학회지
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• 제33권1호
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• pp.25-29
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• 1996

The Debreu-Gale-Nikaido theorem [2] is a potential tool to prove the existence of a market equilibrium price. Walras' law is of a quantitative nature (i.e. it measures the value of the total excess demand), and it is interesting to note that the existence result holds true under some qualitative assumptions. In fact, the Debreu-Gale-Nikaido theorem states that the continuity of the excess demand function and Walras' law has the following implication : For some price and corresponding value of the excess demand function, it is not possible to respond with a new price system such that the value at the new price of every element in the value of the demand function associated with the old price system is strictly positive.

• 한국콘텐츠학회논문지
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• 제21권4호
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• pp.833-841
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• 2021

본 연구는 조선시대에 여악(女樂)을 담당한 예능인이었으나, 사대부(士大夫)의 '성(性)적 상대'로 인식되었던 기생(妓生)의 존재 양상과 그들의 존재가 가능할 수 있었던 조선시대의 사회적 특성을 밝히고자 하였다. 이에 연구는 사대부와 기생의 관계를 다각적인 측면에서 드러내고자 했다는 데에 의미가 있으며, 기생의 다양한 사회적 역할을 확인할 수 있다는 데에 연구의 필요성이 있다. 유교사회에서 여성들이 주축이 된 내연과 친잠례 등에 남자 악공들이 참석할 수 없었기 때문에 여악은 조선조 말까지 존속할 수 있었을 뿐만 아니라 여악은 전문예인이었다는 존재성을 드러내기에 충분하였다. 기생의 존재 양상은 조선시대 사회적 배경과 결코 무관하지 않으며, 따라서 현대사회의 성모랄로 조선시대를 규정지을 수 없다. 『녹파잡기』는 기생을 색정적인 기준에서 묘사하기보다는 비범하고 고결한 정신을 소유한 예능인의 시각에서 보고 있다는 해석에 힘입어, 예인으로서의 기생의 면모를 한층 드높일 것으로 사료된다.

• Journal of Welding and Joining
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• 제5권4호
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• pp.22-27
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• 1987

The debonding of clad steel was often occurred at interface between stainless steel and carbon steel during the fabrication of pressure vessel. In order to clarify the causes of debonding phenomena, the fabrication sequences were fully analyzed. As a result, possible factors were noticed for causing the debonding of clad steel, that is, thermal treatment on weldment and welding. Moreover the existence of hydrogen diffused from surroundings also expedites the debonding of clad steel. In this stud, the effect of welding thermal cycle, hydrogen and mixed condition under thermal treatment on the interfacial strength of clad steel were investigated to understand the debonding mechanism of clad steel. From this study, it has been confirmed that the interfacial strength of clad steel was remarkablely deteriorated due to welding and/or existence of hydrogen under thermal treatment. In the case of welding thermal cycle effect, the higher temperature at interface experienced by welding, the more reduction in interfacial strength of clad steel resulted in. And the existence of diffusible hydrogen also reduced the interfacial strength. It is also found that the interfacial strength of clad steel became much lower value than that of the as-received plate under coexistence of above mentioned factors.