• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 추계학술발표회논문집(1)
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• pp.599-604
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• 1997

One of important inconsistencies in the six-equation model predictions has been found to be the force experienced by a single bubble placed in a convergent stream of liquid. Various sets of governing equations yield different amount of forces to hold the bubble stationary in a convergent nozzle. By using the first order potential flow theory, it is found that the six-equation model can not be used to estimate the force experienced by a deformed bubble. The theoretical value of the particle stress of a bubble in a convergent nozzle flow has been found to be a function of the Weber number when bubble distortion is allowed. This force has been calculated by using different sets of governing equations and compared with the theoretical value. It is suggested in this study that the bubble size distribution function can be used to remove the presented inconsistency by relating the interfacial variables with different moments of the bubble size distribution function. This study also shows that the inconsistencies in the thermal-hydraulic governing equation can be removed by mechanistic modeling of the phasic interface.

• International Journal of Advanced Culture Technology
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• 제8권1호
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• pp.199-206
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• 2020

I suggested the design learning environment based on affordance concept approach for supporting and improving learners' behavior and outcome for convergent design education in this study. The design learning space should be applied teaching and learning activity, especially learners' behavior, physical space condition to support the design thinking process. The design learning space needs openness, individuality and connectivity to support the learners' behavioral to immerse, participate, cooperate, understand, think and fulfill the design thinking process. The composition principles of the learning environment for convergent design education supports communication and collaboration among members for independence and interaction. The spaces for design research and teaching needs high privacy while facilitating visual communications through special materials and wall structure design. Also, for connectivity to improve the learners' physical and visual contact, the environment of the classrooms requires flexibility and mobility by providing an open space integrating unit cells for realizing learning purpose. These are provided by formed of an open structure for inducing visual communication and physical contact to involve the design activities and the mutual interchange.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.56-63
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• 2023

I proposed the architectural guideline for educational environment based on design thinking approach to integrate and enhance learners' activities and achievements. The physical environment of design education learning space should be applied by teaching methods and learning activities, especially for STEAM-based convergent education, the architectural space conditions should support the design process based on design thinking. The learning environment conditions influence design education with physical design factors and learners' communication, and the flexible environment based on design thinking, which is crucial for design education. The 3 steps of design thinking experiences also allow students to learn the context of ideas, skills and outcomes. Therefore, I argued that the learning surrounding based on design thinking needs flexible and mobile, connected, integrated, organized, and team-focused environments to support learners' understanding, participation, and collaboration, and to achieve the design process based on research findings. For spaces for convergent learning environments based on design thinking, common design principles should be reviewed, such as coexistence with technology, safety and security, transparency and spatial extension, multi-purpose space and outdoor learning.

• Journal of applied mathematics & informatics
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• 제16권1_2호
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• pp.125-142
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• 2004

We analyze the convergence properties of Powell's UOBYQA method. A distinguished feature of the method is its use of two trust region radii. We first study the convergence of the method when the objective function is quadratic. We then prove that it is globally convergent for general objective functions when the second trust region radius p converges to zero. This gives a justification for the use of p as a stopping criterion. Finally, we show that a variant of this method is superlinearly convergent when the objective function is strictly convex at the solution.

• Nonlinear Functional Analysis and Applications
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• 제27권1호
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• pp.45-58
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• 2022

In this paper, iterative algorithms for approximating a common fixed point of a countable family of multi-valued demicontractive maps in the setting of Hadamard spaces are presented. Under different mild conditions, the sequences generated are shown to strongly convergent and ∆-convergent to a common fixed point of the considered family, accordingly. Our theorems complement many results in the literature.

• Korean Journal of Mathematics
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• 제32권1호
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• pp.109-120
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• 2024

The aim of this research is to describe lacunary ∆^m-statistically convergent sequences with respect to metrics on generalised metric spaces (g-metric spaces) and to look into the fundamental characteristics of this statistical form of convergence. Also, the relationship between strong summability and lacunary ∆^m-statistical convergence in g-metric space is established at the end.

• Applied Microscopy
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• 제51권
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• pp.1.1-1.2
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• 2021

We demonstrate a fabrication of an atomically controlled single-crystal heart-shaped nanostructure using a convergent electron beam in a scanning transmission electron microscope. The delicately controlled e-beam enable epitaxial crystallization of perovskite oxide LaAlO₃ grown out of the relative conductive interface (i.e. 2 dimensional electron gas) between amorphous LaAlO₃/crystalline SrTiO₃.

• 예술인문사회 융합 멀티미디어 논문지
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• 제8권5호
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• pp.269-277
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• 2018

As multicultural population has been drastically increasing over the decade in Korea, their quality of life needs to be studied. This study focuses on multicultural youths' suicidal issue in Korea. Suicide is one of the most obvious indicators to show the current status of mental health. Unfortunately, suicide attempt rate of multicultural youths was two-times more than that of non-multicultural youths in Korea during the past two years(2014-15). Through the literature review in Korea as well as the United States, this study explores the related variables to their suicide attempt. Research result says that multicultural youth's suicide is related to a variety of variables, including physical, psychological, educational, socio-economical, and cultural variables. Research implications are as follows: First, these variables can be utilized as predictive or protective factors to prevent their suicide. Second, theoretical framework for comprehensively understanding their suicidal issues needs to be developed. Third, both emergent and normal suicidal interventions need to be provided for multicultural youth in Korea.

• 대한토목학회논문집
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• 제7권1호
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• pp.131-139
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• 1987

본(本) 연구(硏究)는 다중사진기법(多重寫眞技法)(multiple method)에 의한 직각수평(直角水平)의 경우(normal case)와 수검수평(收劎水平)의 경우(convergent case)의 특성(特性)을 비교(比較)함으로써 다중사진(多重寫眞)(multi-photos)의 특성(特性)과 최적촬영(最適撮影) 방법(方法)을 제시(提示)하고 이를 모형구조물(模型構造物)의 재하변형측정(載荷變形測定)에 적용(適用), 종래(從來)의 변형측정방법(變形測定方法)과 비교(比較)하여 그의 정확성(正確性), 효용성(效用性) 및 적용(適用) 타당성(妥當性)을 제연(提硏)하는데 목적(目的)이 있다. 그 결과(結果) 구조물(構造物)의 국부적(局部的) 정밀해석(精密解析)을 위한 최적촬영(最適撮影) 조건(條件)은 $90^{\circ}$ 다중수검수평(多重收劎水平)의 경우 (multiple convergent case)를 이용(利用)하는 것이 가장 이상적(理想的)이며, 이를 변형측정(變形測定)에 적용(適用)할 경우 각(各) 교수(校數)에서 직각수평(直角水平) 경우보다 약 55% 이상(以上)의 정확도(正確度) 향상(向上)과 정밀(精密) level의 측정(測定)값에 $5{\sim}9{\mu}m$ 이내(以內)로 접근(接近)되므로 구조물(構造物)의 정밀측정(精密測定)은 물론 변형해석(變形解析)에 이의 활용(活用)이 기대(期待)된다.

• 한국콘텐츠학회논문지
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• 제10권6호
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• pp.415-428
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• 2010

본 연구는 국내 융합기술 분야 연구자들 간의 연구 협력 행태를 알아보기 위하여 사회적 연결망 분석(social network analysis)을 수행하였다. 융합기술분야 연구자 1,095명로 구성된 국내 융합기술 연구자 네트워크의 특성은 다음과 같다. 첫째, 융합기술 연구자들은 다른 과학기술분야에 비해 인당 논문 편수가 많아, 융합기술분야에서 새로운 지식 창조가 활발하게 이루어지고 있음을 보여주고 있다. 둘째, 높은 생산성에 비해 융합기술연구자 그룹의 상당수가 논문의 공동저작을 활발하게 진행하고 있지 않고 제한된 협력 관계만을 보여주고 있다. 마지막으로, 네트워크 구성원들 간의 거리가 다른 과학기술분야의 그것에 비해 가깝지만, 삼각형 모양 관계의 공동 연구하는 형태로 발전하지 않고 양자 간의 공동 연구로만 머물러 있는 경우가 많다. 오직 소수의 연구자들의 허브 역할로 연구자들 간의 연결고리가 유지되고 있다. 즉, 국내 융합기술 연구 분야의 협력 관계는 분권형 이라기보다는 집중형의 특성을 보여주고 있다. 국내 융합기술 연구자들 간의 협력이 보다 활발하게 진행되기 위한 기반조성 정책 프로그램이 필요하다.