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ON THE DYNAMICS OF PREDATOR-PREY MODELS WITH IVLEV’S FUNCTIONAL RESPONSE
Kimun Ryu 충청수학회 2015 충청수학회지 Vol.28 No.3
In this paper, we study the existence and the stability of equilibria of predator-prey models with Ivlev’s functional response. We give a simple proof for the uniqueness of limit cycles of the predator-prey system. The existence and the stability at the origin and a boundary equilibrium point(including the positive equilibrium point) are also investigated.
EXISTENCE OF POSITIVE T-PERIODIC SOLUTIONS OF RATIO-DEPENDENT PREDATOR-PREY SYSTEMS
Kimun Ryu 충청수학회 2021 충청수학회지 Vol.34 No.1
We study the existence of positive T-periodic solutions of ratio-dependent predator-prey systems with time periodic and spatially dependent coecients. The xed point theorem by H. Amann is used to obtain necessary and sucient conditions for the existence of positive T-periodic solutions.
EXISTENCE OF POSITIVE SOLUTIONS OF PREDATOR-PREY SYSTEMS WITH DEGENERATE DIFFUSION RATES
Kimun Ryu 충청수학회 2020 충청수학회지 Vol.33 No.1
We discuss the coexistence of positive solutions to certain strongly-coupled predator-prey elliptic systems under the homogeneous Dirichlet boundary conditions. The sufficient condition for the existence of positive solutions is expressed in terms of the spectral property of differential operators of nonlinear Schrödinger type which reflects the influence of the domain and nonlinearity in the system. Furthermore, applying the obtained results, we investigate the sufficient conditions for the existence of positive solutions of a predator-prey system with degenerate diffusion rates
ON THE DYNAMICS OF PREDATOR-PREY MODELS WITH IVLEV'S FUNCTIONAL RESPONSE
RYU, KIMUN Chungcheong Mathematical Society 2015 충청수학회지 Vol.28 No.3
In this paper, we study the existence and the stability of equilibria of predator-prey models with Ivlev's functional response. We give a simple proof for the uniqueness of limit cycles of the predator-prey system. The existence and the stability at the origin and a boundary equilibrium point(including the positive equilibrium point) are also investigated.
평면 영상 분석을 통한 상황 정보 획득 기반의 적응형 소프트웨어 프레임워크
김기문(Kimun Kim),정우성(Woosung Jung),이병정(Byungjeong Lee),우치수(Chisu Wu) 한국정보과학회 2007 정보과학회논문지 : 소프트웨어 및 응용 Vol.34 No.8
오늘날 소프트웨어가 다양한 환경에서 광범위하게 사용됨에 따라 적응형 소프트웨어에 대한 요구가 증가하고 있다. 적응형 소프트웨어는 환경의 변화에 반응하여 스스로의 행동을 변화시키는 견고하고 유연한 소프트웨어이다. 그러나 환경으로부터 상황 정보를 획득하는 데 있어서의 시간 제약이나 계산 복잡도가 높은 등의 어려움으로 인해, 실제 구현 시 보다 획득이 쉬운 데이타로 환경을 한정하는 경우가 많다. 따라서 본 연구에서는 충분한 복잡도를 지니면서 획득이 쉬운 평면 영상을 환경으로 가정, 상황 정보를 획득하고 행동 규칙 정보를 바탕으로 추론하여 행동하는 적응형 소프트웨어의 프레임워크를 제안한다. 이를 바탕으로 간단한 게임을 자동으로 조작하는 소프트웨어를 구현하였다. As software is widely used on various environments today, there is an increasing need for adaptive software. Adaptive software is robust and flexible software that modifies its own behavior in response to the changes in its environment. Due to time constraints, high complexity and so on, it is hard to acquire context information from environment. So, when implementing software, it is common to think easily acquired data to be the environments. This research proposes an adaptive software framework that assumes plane images to be environments. Plane images are easy to acquire and have enough complexity. From this, our framework is able to acquire context information, reasons with action rule, and acts on the result of reasoning. Stand on this framework, implements software that plays a simple game automatically.
Existence and non-existence of positive solutions to certain nonlinear PDE systems
RYU, KIMUN 청주대학교 학술연구소 2015 淸大學術論集 Vol.24 No.-
본 논문에서는, 개체수의 밀도비에 의존하는 반응 함수를 가진 약육강식 모델을 나타내는 비선형 편미분 방정식계의 동역학에 대하여 살펴본다. 양의 해의 안정성, 멸종 그리고 [18]에서 얻은 점근적 양의 해의 양립성에 대하여 고찰한다. 또한 얻은 결과들을 수치적으로 확인하고 생물학적 해석을 제공한다.
Existence of positive periodic solutions to certain single PDE
RYU, KIMUN 청주대학교 학술연구소 2017 淸大學術論集 Vol.28 No.-
본 논문에서는, 비선형 성장비를 갖는 어떤 편미분방정식의 양의 주기해의 존재성에 관하여 살펴본다. 즉, 양의 주기해가 존재성과 유일성에 관하여 조사한다. 본 연구는 향후 약육강식 모델의 양의 주기해의 존재성, 안정성, 멸종 그리고 점근적 양의 해의 양립성 등의 연구에 중요한 단초가 될 것으로 사료된다.
김운미(KimUn-Mi) 한국체육학회 2003 한국체육학회지 Vol.42 No.4
This study attempted to make a comparative analysis of the realities of dance education in the 1970s when South Korea and North Korea sought to construct their independent political system in a different framework of capitalism and socialism.First, in case of South Korea, education was provided for people based on the ideology of The National Charter of Education in an attempt to adopt strong nationalism as the prime mover for national integration under the regime of Revitalizing Reform that proclaimed Korean-type development dictatorship. On the other hand, North Korea adopted the theme for education of socialism as the comprehensive guidebook to construct the hereditary regime handed down from Kim Il-sung to his son Kim Jung-il.Second, South Korea came to foster the climate for inciting the revival of national culture in the cultural and artistic but the rapid development of economy and the mass-production of wee-educated people facilitated the regime of Revitalizing Reform to collapse paradoxically. On the other hand, North Korea defined the cultural and artistic field as one of the means for strong and instigation to promote the learning of Chuche(identity) ideology and carried it into practice, thereby contributing to the completion of Kim Jung-il's hereditary regime.Third, the active presentation of creative dance based on dance education in Korea reestablished dance as composite arts through large-scale performance as the center of the dance world moved from the department of dance in college to the group of professors. But North Korea was faithful to themes while taking the form of prop for popularization and living because the artistry of all works was evaluated in accordance with the practice of the contents directed by Kim Il-sung and Kim Jung-il.Fourth, dance education showed the speciality mentioned in relation to creative dance as well as folk dance in the contents of instruction based on the Third Curriculum revised in 1973. It not only limited the object of education to female students but the introduction of the 'physical strength measurement system' made dance education further dwindle. On the other hand, dance education was provided only for female students as one unit of physical education in advanced middle school in North Korea and its content was composed only of artistic dance(rhythm gymnastics) and sports dance. But it can be found that its educational effect was greater than that of South Korea because of the policy of the party and its accompanying thorough practice for making all subjects available to all people.
REMARKS ON THE RATIO-DEPENDENT PREDATOR-PREY INTERACTION SYSTEMS
RYU, KIMUN 청주대학교 학술연구소 2019 淸大學術論集 Vol.32 No.-
본 논문에서는 의 동역학에 관하여 살펴본다. [18]에서 얻은 개체 밀도비에 의존하는 약육강식 모델에 관한 양의해의 존재성, 안정성, 멸종 그리고 점근적 양의 해의 양립성 등에 관하여 논하고, 이에 대한 수치적 예제와 생물학적 의미를 살펴본다.