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Fuzzy Adaptive Modular Design of Uncertain Chaotic Duffing Oscillators
유성훈,강효석,김용태,박민용,현창호 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.1
This paper proposes a fuzzy adaptive control approach based on a modular design for uncertain chaotic Duffing oscillators. Using fuzzy logic, the unknown nonlinear function in the Duffing oscillator is approximated. Subsequently, a modular adaptive controller is derived consisting of an input-to-state stabilizing (ISS) control module and a passive identifier module. Since the modular design allows for independent design of the controller and identifier, the proposed method provides substantial flexibility in the choice of a parameter identifier. Additionally, the modularity of the controller-identifier pair provides simplicity in the control system derivation. Simulation results are included to illustrate the effectiveness of the proposed approach.
유성훈,박상희,강우진,한승욱 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.4
In this study, the flow characteristics according to the shape of the vortex nozzle was studied by numerical analysis and the amount of microbubble generation was measured experimentally. The shape of the vortex nozzle is cylindrical, diffuser, and conical type. The axial fluid velocity in the induced tube gradually increased from the inlet to the outlet. In particular, the fluid velocity in the nozzle part increased rapidly. The velocity distribution of the fluid at the inlet of the induced tube showed that the flow rotates counterclockwise in the outer region and the inner center of the induced tube. At the outlet of the induced tube, the cylindrical and conical type showed rotational flow, and the diffuser type showed irregular turbulent flow. The dimensionless pressure ratio of the inner region of the induced tube was lower than that of the outer region. Also, near the outlet of the induced tube in cylindrical and conical type showed a similar tendency to the inlet area. At the outer region of inlet of induced tube, intense vorticity was observed on the wall and in lower region. At the inner region of inlet of induced tube, intense vorticity was observed on the inner wall of the induced tube and in the central region of the inlet of the induced tube. At the outlet of induced tube, in the case of the cylindrical and conical type, intense vorticity was observed near the inner wall, the diffuser type showed irregular strong vorticity inside the tube. The total number of bubbles measured was the most in the cylindrical type, and the microbubbles less than 50mm occurred the most in the conical type.
유성훈,조승호,박현수,어양석,정란 대한건축학회 1998 大韓建築學會論文集 : 構造系 Vol.14 No.4
현 행시공에서는 상·하벽체를 긴결할 때 내진철근을 연결하기 위하여 접합부에 포켓을 설치하 게 되는데 이러한 포켓의 설치로 압축단면적의 결손이 생기게 되며, 이러한 압축단면적의 결손은 프리캐스트 콘크리트구조를 고층화하는데 많은 어려움이 되고 있다.본연구는 이러한 압축단면적의 결손을 상쇄시키기 위하여 이러한 포켓부위에 적절한 재료와 충전방법으로 충 전하여 압축단면적을 상쇄시키는데 목적이 있다.본연구는 부분시험체 72개를 제작하여 압축 실험 및 절단실험을 통하여 충전부위에 충전되는 재료 및 충전방법, 충전접합부의 형태에 따른 충전성을 검토하였다. 또한 이러한 결과를 반영하여 구조시험체 15개를 제작하여 충전 재료, 충전방법을 변수로 하여 각 시험체의 변수별 파괴형상, 하중-변위곡선, 최대내력등을 조사 분석하고, 이론해석에서는 기존의 제안된 이론식 및 결과를 비교·검토하였다.
한국인의 공적개발원조 정책에 대한 선호 결정 요인: 국가의 책무성 및 국가 자긍심을 중심으로
유성훈 전북대학교 사회과학연구소 2022 지역과 세계 Vol.46 No.2
본 연구의 목적은 한국인들의 공적개발원조 정책에 영향을 미치는 요인들에 대한 실증적 분석에 있으며 이를 위하여 사회정책에 있어서의 국가의 책무성에 대한 인식과 국가 자긍심을 살펴보았다. 국가의 책무성이란 국가가 복지 정책을 통하여 국민의 삶을 국가가 어느 정도 책임져야 하는가, 경제에는 어느 정도로 개입해야 하는가를 말한다. 또한, 국가 자긍심이란 자신이 속한 국가에 대해 가지는 정서적인 애착감을 말한다. 이들 사이의 관계를 분석하기 위하여 본 연구는 2018년 한국종합사회조사(KGSS)를 사용하여 순위형 로지스틱 모형(ordered logistic model)을 통한 분석을 진행하였다. 분석 결과, 국가의 책무성이 높아야 된다고 인식할수록 즉, 복지 정책과 국가의 경제 개입에 대한 태도가 긍정적일수록 원조 정책을 지지할 확률이 높은 것으로 나타났다. 그러나 국가 자긍심은 원조 선호에 통계적으로 유의미한 영향을 미치고 있지 못하다. 이러한 결과는 신흥 공여국으로 부상하고 있는 한국이 지속가능한 원조를 수행하기 위한 국내 정치 여론의 지지를 이끌어 내기 위하여 국가 역할의 긍정적인 점에 대한 인식을 확산시켜야 한다는 점을 시사한다. This article investigates factors affecting attitudes toward official development assistance (ODA) in South Korea, focusing on perceptions of state responsibility and national pride. State responsibility includes the extent to which the state is responsible for the lives of its people through welfare policies and the degree to which the state should intervene in the economy. National pride refers to the emotional attachment people have to their country. An ordered logistic model is used for the analysis based on the 2018 Korean General Social Survey. The results show that higher scores for state responsibility, indicating positive perceptions of welfare policies and economic interventions by the state, were associated with greater support for ODA. However, national pride did not have a statistically significant effect on attitudes toward ODA. These results suggest that South Korea, an emerging donor country in international society, should embrace the state's role in sharing public opinion regarding sustainable ODA.
물리적 처리에 따른 라이오셀 장섬유 부직포 린트 조절 공정 연구 및 여과 성능 시뮬레이션 연구
유성훈,권기환,여동현,김기웅,유종성,심지현 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.6
Lyocell fiber, with its elasticity and excellent touch, is ideal for use in clothing andsanitary products. Additionally, unlike viscose rayon, solvent recovery and carbon neutralityis possible, making it environmentally friendly. Research to activate lint on the surface ofthe fibers by chemically treating lyocell long fiber nonwoven fabric has been underway. Asa chemical treatment method, after immersing the lyocell long fiber nonwoven fabric in analkali solution, the degree of lint generation on the surface of the long fiber nonwoven fabricwas analyzed, and its chemical and physical properties were analyzed upon alkali treatment. A 3D model was generated using the physical properties of the chemically treatedlyocell nonwoven fabric, and a filtration performance simulation study was conducted subsequently. Alkali treatment activated the lint on the surface of the fabric with the NaOHtreatedspecimen producing the most lint. Further, simulation results showed that the pressureloss value was the lowest as the specific surface area of the specimen treated withNaOH was the largest. It’s value also reduced by more than 23.2% compared to the specimenwithout chemical treatment.