• 비파괴검사학회지
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• 제28권2호
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• pp.199-204
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• 2008

The generation of axisymmetric Lamb waves and interaction with wall thinning (corrosion) defects in hollow cylinders are simulated using the finite element method. Guided wave interaction with defects in cylinders is challenged by the multi-mode dispersion and the mode conversion. In this paper, two longitudinal, axisymmetric modes are generated using the concept of a time-delay periodic ring arrays (TDPRA), which makes use of the constructive/destructive interference concept to achieve the unidirectional emission and reception of guided waves. The axisymmetric scattering by the wall thinning extending in full circumference of a cylinder is studied with a two-dimensional FE simulation. The effect of wall thinning depth, axial extension, and the edge shape on the reflections of guided waves is discussed.

• Bulletin of the Korean Chemical Society
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• 제17권12호
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• pp.1117-1123
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• 1996

Chiral recognition models for resolving π-basic N-acyl-α-(1-naphthyl)alkylamines and π-acidic N-(3,5-dinitrobenzoyl)-α-amino alkyl esters on a (S)-tyrosine-derived chiral stationary phase (CSP) containing both π-basic and π-acidic interaction site have been proposed. In the models, the CSP was supposed to interact with the analytes through the π-π interaction between the 3,5-dinitrophenyl or the 3,5-dimethylphenyl group of the CSP and the 1-naphthyl or the 3,5-dinitrophenyl group of the analyte, and through the hydrogen bonding interaction between the appropriate N-H hydrogen of the CSP and the appropriate carbonyl oxygen of the analyte. In this instance, the alkyl substituent of the pertinent enantiomer of the analyte was found to intercalate between the adjacent strands of the bonded phase and consequently control the trends of the separation factors.

• International Journal of Naval Architecture and Ocean Engineering
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• 제1권1호
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• pp.20-28
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• 2009

In thus paper we validate a numerical model for wave-structure interaction by comparing numerical results with laboratory data. The numerical model is based on the Navier-Stokes (N-S) equations for an incompressible fluid. The N-S equations are solved by a two-step projection finite volume scheme and the free surface displacements are tracked by the volume of fluid (VOF) method The numerical model is used to simulate solitary waves and their interaction with a group of slender vertical piles. Numerical results are compared with the laboratory data and very good agreement is observed for the time history of free surface displacement, fluid particle velocity and wave force. The agreement for dynamic pressure on the cylinder is less satisfactory, which is primarily caused by instrument errors.

• 한국생활과학회지
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• 제15권1호
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• pp.1-15
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• 2006

The purpose of this study is (1) to investigate how children's peer interaction type and joint problem-solving performance differ, depending on a partner's age, in such a situation as they are asked to solve problems with their peer and (2) to investigate relationship between children's peer interaction type and joint problem-solving performance. Results reveal that children's problem-solving performance receives more benefit in the interactions with older peers, rather than those with younger ones. It can also be improved by higher level of collaborative interactions such as abstract collaborative explanations in joint activities. It is influenced positively by collaborative interactions, expecially when the children are in the same age groups. Results here were discussed in terns Piagetian and Vygotskian theories.

• 아동학회지
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• 제30권4호
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• pp.257-276
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• 2009

This study investigated differences in toddlers' language development depending on their teachers' types of interaction during reading of picture books. A pilot study identified teachers' types of interaction as instructional, non-immediate, and passive. Fifteen teachers recruited from 10 child-care centers located in Seoul and their 90 2-year-old toddlers participated in this study. Teachers read two picture books to a small group of toddlers each week for eight weeks. Data on the toddlers' receptive and expressive language, vocabulary, reading behavior, and book handling were collected and compared by their teachers' interaction type before and after teachers' 8-week reading of picture books. Results showed that teachers using the non-immediate interaction type had the most positive effects on toddlers' language development.

• Journal of Information Technology Applications and Management
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• 제13권2호
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• pp.41-54
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• 2006

In this paper, we investigate the inter-organizational information systems effect to supply chain partnerships, and subsequently to the performance. The conceptual model for the causal relationships among interorganizational systems usage, interaction, partnership, and supply chain performances has been developed. Theoretical framework is based on the partnership research in relationship marketing area, and the interaction model from IMP group. The questionnaires are designed to test the hypotheses of the conceptual model. The survey result supports our hypotheses that collaborative IT effects to increase the interaction between the firms, and interaction causes to enhance the partnership quality. Also, the level of partnership shows strong positive correlation with the supply chain performances. Despite the limitations of collected sample data size, our study reveals the fact that inter-organizational information systems contribute to supply chain performance through enhancing the interaction and partnership level between the supply chain partners. Our research result is distinct from the most extant literatures that investigated the firm's collaboration impact on interorganizational systems usage.

• 한국과학교육학회지
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• 제32권4호
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• pp.604-624
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• 2012

본 연구는 한 학기 동안 비과학 전공 대학생들의 사회 속 과학 쟁점에 대한 일련의 소집단 논변을 참여자 상호작용을 중심으로 설명하는 분석틀 마련을 위한 연구이다. 분석틀 마련을 위하여 소집단 논변이 진행되는 상황의 특성 및 논변과 사회적 상호작용 분석을 위한 방법들을 고찰하였다. 연구 상황과 관련하여 논변의 제재가 사회 속 과학 쟁점이며, 참여자들의 논변 경험이 제한되었음을 고려하였다. 따라서 소집단 논변을 통해 관련된 다양한 입장과 견해를 고려했는지, 그리고 참여자의 상호작용 역할 및 일련의 논변을 통한 변화와 발달을 제시할 수 있는 분석틀을 고안하고자 하였다. 기존 분석 방법들 중 과학교육에서 논변의 분석에 가장 빈번히 사용된 Toulmin이 제시한 논변의 구조를 고찰하고, 어떻게 변형되어 다른 연구에 이용되었는지 살펴보았다. 또한 상호작용의 기능과 전략을 설명한 연구들을 토대로 하여 각 발화의 기능을 구분하였다. 이러한 문헌 연구를 바탕으로 분석틀을 마련하였는데, 상호작용 역할과 절 내에서의 기능, 논변 수준에 기여하는 발화를 나타내는 것으로 각 발화를 15개 종류로 구분하여 제시하였다. 도입에 해당하는'시작', '사담', 응답에 해당하는 '단정지음', '응답', '반복', '약간부연', '다른면', '종합', '정교화', '반박정교화', 그리고 반응에 해당하는 '단순응대', '핀잔', '확인', '회의', '설명요청'으로 구분하고, 이전의 발화에 대한 이해를 바탕으로 분석하고 종합한 '향상발화'와 그렇지 않은 '단순발화'로 수준을 구분하였다. 고안한 분석틀로 '에이즈 치료약 개발비와 약소국의 특허권 불인정 주장' 쟁점에 대한 소집단 논변분석 사례를 제시하였다. 분석 결과 고안한 분석틀은 소집단 논변 동안 참여자들이 다양한 견해를 인식하고 관련 과학 지식을 고려했는지를 드러내는데 적절하였다. 또한 소집단 논변 동안 각 참여자의 역할 및 참여자들의 상호작용과 논변의 수준을 관련지어 나타낼 수 있었다. 고안한 분석틀은 정성적인 분석뿐만 아니라 정량적인 분석을 가능하게 함으로서 소집단 구성원들의 상호작용 양상 및 두 소집단의 논변 양상에 대한 비교를 가능하게 하였다.

• 대한작업치료학회지
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• 제26권4호
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• pp.111-125
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• 2018

목적 : 본 연구는 그룹감각통합치료가 지적장애아동의 감각처리와 또래상호작용, 과제수행에 미치는 영향과 그 효과의 지속여부를 알아보고자 하였다. 연구방법 : 본 연구는 만 7세 이상 13세 미만의 아동 12명을 대상으로 주 3회 60분씩 8주 동안 진행하였다. 그룹감각통합치료는 감각처리와 놀이기술, 또래와의 상호작용이 포함된 총 24가지 주제에 맞는 활동으로 구성되었으며, 대상자를 선별하기 위하여 단축감각프로파일을 사용하였다. 결과를 측정하기 위하여 단축감각프로파일과 또래놀이 상호작용 평점척도, 캐나다 작업수행 측정을 사용하여 대상자의 감각처리와 또래상호작용, 과제수행의 사전 사후 추적 평가를 실시하였다. 측정 결과는 반복측정 분산분석을 사용하여 사전 사후 추적조사의 평균 점수 차이를 분석하였고, 윌콕슨 순위검정을 사용하여 사전 사후 추적조사의 변화의 차이를 비교하여 분석하였다. 결과 : 그룹감각통합치료 중재 이후 대상자들의 감각처리와 또래상호작용, 과제수행에 유의한 향상을 보였다(p<.05). 4주후 실시한 추적조사에서 치료의 효과가 유지되는 것을 확인하였다. 결론 : 그룹감각통합치료는 감각처리능력의 증진뿐만 아니라, 또래상호작용이 필요한 학령기 아동들에게 모방과 그룹 안에서의 연습을 제공하고, 일상생활까지 그 효과를 연결할 수 있는 효과적인 중재방법이다.

• 성인간호학회지
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• 제13권1호
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• pp.108-122
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• 2001

The cause of essential hypertension is yet unknown, but in general is caused by interaction of hereditary factors, diet, obesity, lack of exercise and stress. The aging process influences various physiological mechanism related to regulation of blood pressure. So elderly hypertensives have a tendancy to consider the disease as a result of the physiological aging process. This attitude causes many complications, worsening of the disease and even early death because of inappropriate care. In order to improve self-management of elderly hypertensives in this study the researcher examined the effect of blood pressure regulation by an education program that improves self-care behavior, through increasing self-efficacy. The education program consisted of group education on hypertension and self-care strategies, and encouraging and reinforcing self-efficacy resources such as verbal persuation, performance accomplishment and vicarious experiences. A quasi-experimental pre-and post-test design was used. Thirty-two elderly hypertensives participated in the study. Eighteen in the education group and fourteen in the control group. The education program consisted of eight sessions twice a week for four weeks. There was no intervention for the control group. Data were analysed using SPSS for Windows(Version 8.0). The results were as follows. 1. There was a significant decrease in systolic and diastolic blood pressure between the experimental group and control group over three different times, and interaction by groups and over time. 2. There was no significant difference in the level of self-care behavior between the experimental group and control group over three different times, and interaction by groups and over time. 3. There was significant difference in selfefficacy of experimental and control group, depending on the measuring period, but there was no difference between these groups on interaction by groups and over time. 4. There was positive correlation between self efficacy and self care behavior depending on the measuring period. There was negative correlation between diastolic blood pressure and self-care behavior on the posttest of the program, and between systolic blood pressure and self-care behavior on the follow-up test of the program. Findings indicate that this study will contribute to develop nursing strategies for the regulation of blood pressure for the elderly, which is easy for the elderly to learn as a nonpharmacologic approach.

• 한국콘텐츠학회논문지
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• 제12권5호
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• pp.525-540
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• 2012

본 연구에서는 사이버대학에서 고립감, 상호작용, 콘텐츠만족도, 성취도 및 학습지속의향 간의 구조적 관계를 검증하고 직장유무에 따른 차이를 분석하는 것을 목적으로 하였다. 이를 위해 2011년 2학기 A 사이버대학 학생을 대상으로 연구를 수행하였다. 연구결과 첫째, 상호작용은 고립감에 영향을 미치는 것으로 나타났다. 둘째, 상호작용은 콘텐츠만족도에 유의한 영향을 미치는 것으로 나타났으며 셋째, 상호작용이 성취도에 미치는 영향력이 유의한 것으로 나타났다. 넷째로 고립감과 상호작용은 학습지속의향에 영향을 미치는 것으로 나타났다. 마지막으로 직장 유무에 따른 고립감, 상호작용, 콘텐츠만족도, 성취도 및 학습지속의향에서 경로계수 차이를 분석한 결과 집단 간 유의미한 차이는 없는 것으로 드러났다. 이러한 결과를 바탕으로 사이버대학에서의 사이버교육콘텐츠 및 교육의 질 제고를 위해 요구되는 콘텐츠 설계 및 운영전략을 제언하였다.