• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제14권2호
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• pp.79-91
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• 2010

In this paper, a class of fractional integrodifferential equations of mixed type with nonlocal conditions is considered. First, using contraction mapping principle and Krasnoselskii's fixed point theorem via Gronwall's inequailty, the existence and uniqueness of mild solution are given. Second, the existence of optimal pairs of systems governed by fractional integrodifferential equations of mixed type with nonlocal conditions is also presented.

• 대한수학회지
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• 제33권3호
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• pp.575-585
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• 1996

Recently, existence theorems of coupled fixed points for mixed monotone operators have been considered by several authors (see [1]-[3], [6]). In this paper, we are continuously going to study the existence problems of coupled fixed points for two more general classes of mixed monotone operators. As an application, we utilize our main results to show thee existence of coupled fixed points for a class of non-linear integral equations.

• 호남수학학술지
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• 제26권4호
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• pp.391-399
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• 2004

In this paper, we develop an iterative algorithm for solving a class of nonlinear mixed implicit variational inequalities in Hilbert spaces. The resolvent operator technique is used to establish the equivalence between variational inequalities and fixed point problems. This equivalence is used to study the existence of a solution of nonlinear mixed implicit variational inequalities and to suggest an iterative algorithm for solving variational inequalities. In our results, we do not assume that the mapping is strongly monotone.

• Nonlinear Functional Analysis and Applications
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• 제29권2호
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• pp.517-526
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• 2024

In this paper, some iterative methods are used to discuss the behavior of general mixed-harmonic variational inequalities. We employ the auxiliary principle technique and g-strongly harmonic monotonicity of the operator to obtain results on the existence of solutions to a generalized class of mixed harmonic variational inequality.

• 대한수의학회지
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• 제38권1호
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• pp.91-99
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• 1998

The immunogenetic analysis was performed to characterize the Korean native chickens (KNC) determined by monoclonal antibodies specific to chicken leukocyte differentiation antigens and flow cytometry. A total of 174 chickens including 58 KNC (black, brown and darkbrown colored), 77 foreign breed (Nagoya, White Reghorn, Rhode Island and Cornish) and 39 mixed breed (19 KNC with Nagoya and 20 KNC with Rhode Island) separately growing at Animal Science and Technology Institute were examined. The proportion of cells expressing MHC class II molecule (B-L in chicken) was significantly high in KNC. Proportion of CD4+ T helper cells was also higher in KNC and two mixed breed than that in foreign breed. However, proportion of CD8+ cells and TCR1 + (${\gamma}^{\delta}$ T cell receptor) cells was the lowest among the breed examined. Otherwise, those proportions were significantly high in White leghorn and two mixed breeds with two exclusive subpopulations. The two subpopulations were also typically shown in MHC class $II^+$ cells in KNC and one mixed breed, black-colored KNC with Nagoya. Although genotypic analysis was not pursued to characterize the immunogenetic properties of KNC, difference of phenotypic expression based on leukocyte differentiation molecules could be elucidated in KNC in this study.

• 한국콘텐츠학회논문지
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• 제22권10호
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• pp.778-787
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• 2022

본 연구에서는 수업 유형에 따른 수업설계 및 교수전략 수립을 위한 기반 자료를 얻기 위하여 동일 교수자의 동일 강좌에 대한 서로 다른 수업 유형의 강의 평가 결과를 비교 분석하였다. 콘텐츠 수업, 온라인 실시간 수업, 온라인과 대면 혼합 수업, 대면 수업 등 4가지 수업 유형으로 나누어, 이에 따른 학습자 만족도를 비교 분석하고 각 유형에 대한 학습자의 요구를 확인하였다. 연구 결과, 강의 진행 적절성에 대한 강의 평가 영역에서 수업 유형별 만족도 차이가 나타났다. 즉, 온라인 실시간 수업 유형에서의 강의 진행에 대한 만족도가 콘텐츠 수업, 혼합 수업, 대면 수업의 만족도에 비해 낮게 나타났다. 서술형 강의 평가 분석 결과, 학습자들은 콘텐츠 수업에서는 쉽게 이해 가능하고 재미있는 설명에 만족한다고 응답하였다. 온라인 실시간 수업의 경우, 학생들은 철저한 준비와 원활한 소통에 만족한다고 평가하였다. 혼합 수업에서는 체계적 수업과 열정적 강의에 만족한다고 하였으며, 대면수업에서는 상호작용의 즐거움과 교수자의 열정을 만족도의 주된 이유로 표현하였다. 네 가지 수업 형태에서 공통적으로 도출된 만족도 특성은 교수자의 열정이라고 분석되었다. 연구 결과는 각각의 수업 유형에 따른 수업 설계와 교수 전략 수립에 시사점을 제공할 것으로 기대된다.

• Educational Technology International
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• 제19권2호
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• pp.175-197
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• 2018

Flipped classroom (FC) has gained attention as an active learning approach. Designing effective out-of-class activities to help prepare students for in-class activities is fundamental for successful implementation of FC. This study investigated the effectiveness of Goal-Based Scenarios (GBS) for out-of-class learning in FC. Four out of twelve units in a medical humanities course for Year 2 medical students was redesigned into a FC format, where e-learning modules were designed using a GBS approach for out-of-class activities and classroom debates were implemented for in-class activities. The other eight units were delivered in a conventional classroom debate format, which included reading text materials as pre-class assignments. A formative evaluation study was conducted using questionnaires and interview methods and students' academic achievements were evaluated by comparing their pre- and post-test scores between FC and conventional units. Students had positive perceptions of the e-learning modules in GBS approach and preferred the structure of learning in the FC format. Students' pre-test scores were slightly higher in the FC units, yet their post-test scores were comparable with conventional units. This study illustrates students' perceptions that the learning was bettered structured in FC and that the out-of-class learning using the GBS approach helped them better prepared for in-class activities.

• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.165-176
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• 2016

This study developed the learning ability-based smart education program. The effectiveness of the developed materials was investigated using the quantitative-qualitative mixed method, and the process and results of the investigation are as follows. The quantitative investigation was conducted using the non-equivalent pretest-posttest design, in which the smart education method was applied to the experimental group, while the conventional education method was applied to the control group to analyze students' creative problem-solving potential, task concentration, and the variables required for the learning activity. The results showed significantly higher performance in the experimental group over the control group. Regarding data collection in the qualitative investigation, an analysis of the class from the instructor and class consultation logs from the class analyst were collected; the comments on the experience of each class period were collected from students. The results of the analysis of the data suggest that the perception of smart education improved for the instructor, class analyst, and learners as the course progressed.

• 아동학회지
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• 제31권5호
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• pp.79-99
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• 2010

This study inquired into the life and experiences of two elder sisters who have different individual and familial risk factors and their younger brothers from the mixed-age preschool class through ethnographic research method using participant observation. The results showed that an elder sister from low-income multi-children family played her role very actively through caring for, learning and playing with younger brother during almost of the play situations. On the other hand, the other elder sister who has experience of depression, showed strong possessiveness and neglect of younger brother. As for psychological aspects of sibling relationship, the elder sisters were suffering psychological stresses resulted from excessive role expectation in family or from self-recognition on elder sister role, respectively.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.156-157
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• 2022

The purpose of this study is to propose a 40MPa mortar mixed design model that applies the neural network theory to minimize wasted effort in trial and error. A mixed design model was applied to each of the 60 data using fly ash, blast furnace slag fine powder and thickened rice husk powder. And in the neural network model, the optimized connection weight was obtained by repeatedly applying it to the MATLAB. The completed mixed design model was demonstrated by analyzing and comparing the predicted values of the mixed design model with those measured in the actual compressive strength test. As a result of the mixed design verification experiment, the error rates of the double mixed non-cement mortar using blast furnace slag fine powder and rice husk powder at a height of 40MPa were 3.24% and 3.4%. Mixed with fly ash and rice husk powder had an error rate of 3.94% and 5.8%. The error rate of the triple mixed non-cement mortar of the rice husk powder, fly ash, and blast furnace slag fine powder was 2.5% and 5.1%.