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Measurement of Nondestructive Residual Stress by Acoustoelasticity (음탄성에 의한 비파괴적 잔류응력 측정)

  • 박인근;이철구
    • Journal of Welding and Joining
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    • v.17 no.2
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    • pp.25-28
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    • 1999
  • 국내에 건설되어 거의 20∼30년 가동되고 있는 발전설비, 석유화학 플랜트 등 거대설비 기기의 건전성(integrity) 및 신뢰성 확보와 잔존수명 예측을 위해서는 구조물 내부 또는 표층부에 존재하는 결 함의 특성을 아는 것과 함께 그 재료의 특정 부위에 어느정도의 응력이나 변형이 있는가를 아는 것이 매우 중요하다. 일반적으로 강 용접부의 비파괴적 결함검출에는 주로 SV파(vertically shear wave)와 SH파(horizontally shear wave)라 불리는 횡파를 이용한 초음파사각탐상법이 실용화되어 이용되고 있다. 그러나 비파괴적인 방법에 의한 실험적인 잔류응력 측정, 변형해석법에는 전기 저항 및 자기 스트레인 게이지법, X선회절법, 광탄성법(photoelasticity), 모아레(Mohr's)법, 레이저스펙클(Laser speackle)법, 응 력도료법, Barkhausen Nosise법, Caustics법 등이 제시되어 있으나 그 유용성 면에서는 아직 해결되야할 문제가 많이 남아 있는 실정이다. 응력이나 변형을 해석하는 방법으로 이론적 방법, 계산적 방법 실험적 방법이 잇다. 이론적 방법에는 재료 역학적으로 취급하는 방법, 탄성론 등이 있고, 계산적인 방법에는 유한요소법이 있지만, 이론적 방법이나 계산적 방법만으로는 해석이 불가능한 경우가 많기 때문에 실험 적 방법이 필요하게 된다. 이 글에서는 파괴 시험 또는 다른 비파괴평가기술에 비해 간편한 측정, 높은 측정정도, 시험결과 도출의 신속성, 검사비용의 절감 등 많은 장점을 가지고 있고 실험적으로 유용성이 일부 검증되고 있는 음탄성법(Acoustoelasticity)에 의한 잔류응력 측정법에 관해 소개하고자 한다.TEX> mg/L(평균 49 mg/L)로 비교적 안정적인 처리효율을 보여주었다. 본 연구결과 HVC 공정은 화학약품 사용량의 절감 및 이에 따른 화학슬러지 발생량의 감소를 기대 할 수 있는 친환경기술로 유지관리비를 최소화할 수 있는 장점이 있었다. 않은 사람들 중 미래의 검진실행의지에 건강소식지가 영향을 미친 경우는 48.7%였다. 보건교육을 받은 후 유방암 자가검진 실천율은 사업군에서 53.9%로 받기 전의 27.3%보다 증가하였으나 대조군의 경우는 별 차이가 없었다. 연령별로는 60대가 가장 높았고 사업군에서 검진율의 증가분은 30대가 가장 컸다. 교육수준별로는 사업군은 고졸이, 대조군은 전문대졸이 가장 높았고 사업군에서 검진율의 증가분은 고졸에서 가장 컸다. 보건교육 후 유방암과 관련된 건강지식의 정도는 사업군이 3.7점으로 대조군보다 유의하게 높았으며, 유방암 자가검진법을 실천하는 사람들의 동기는 ‘일반 대중매체의 영향’이 가장 많았으며 건강소식지가 동기인 경우도 20.4%였다. 사업군에서 건강소식지가 유방암 자가검진법 실천에 영향을 미친 경우가 79.6%였으며 유방암 자가검진법에 관한 보건교육을 받고 실천하지 않은 사람들 중 미래의 실천의지에 건강소식지가 영향을 미친 경우는 43.6%였다. 이상의 소견에서 지역주민을 대상으로 인쇄매체를 통한 보건교육은 인쇄물만으로도 쉽게 실천 할 수 있는 유방암 자가검진법이 가장 효과적이었으며, 자궁암검진에 관해서도 검진을 받을 수 있도록 지역사회의 보건의료의 하부구조를 정비하여 제도적 장치를 마련하고 정보를 제공한다면 자궁암검진 실천율도 증가할 것이다.고 12.9% 의 발달율을 보여 유의적인 차이를 보이지 않았다. 이상의 결과로 보아 핵이식 수정란을 효율적으로 생산하기 위하여

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The Synthetic Comprehension of 'Humanitarianism,' 'Accompaniment Society,' and the 'Resolution of Grievances for Mutual Beneficence' and Their Meaning: a Search for the Active Practice of Good (홍익인간·대동사회·해원상생의 회통과 의미 - 선(善)의 적극적 실천을 위한 모색 -)

  • Son, Heung-chul
    • Journal of the Daesoon Academy of Sciences
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    • v.30
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    • pp.131-162
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    • 2018
  • In this article, I studied how we can heal resentment (㝨) and regret (恨) in the present and future world that are deeply rooted in our society, and I sought out the theoretical and practical measures to realize peace and mental well-being of the Korean people. For this purpose, firstly, I reinterpreted the content of 'Hongik Ingan Humanitarianism (弘益人間)' as an idea and its practical methods into a critical perspective, and confirmed that it is the ideological and emotional root of the Korean people. And I looked at concrete action plans for the present and in the future. Next, I studied the contents of the 'Accompaniment Society (大同社會)' for studying abroad and how to realize its ideals. Through this process, it was confirmed that Accompaniment Society is also deeply rooted in the sentiments of the Korean people. I also found out that more active and practical theoretical methodological studies are necessary to heal the resentment and regret common in our society. Lastly, I studied the fundamental and essential meaning of 'The Resolution of Grievances for Mutual Beneficence (解冤相生),' the major, representative concept of 'The Truth of the Great Itineration (大巡眞理).' Through this process, I confirmed the possibility that the Resolution of Grievances for Mutual Beneficence could be transformed into a universal value and could be sublimated to a practical norm in the future. In particular, I found that the logic of "the Resolution of Grievances for Mutual Beneficence" is highly practical in resolving feelings of resentment in the Korean people. Through the above study, 'The Resolution of Grievances for Mutual Beneficence' of 'The Truth of the Great Itineration' can emerge as a 'win-win' system of ethics in the future through the synthetical comprehension of the ideals of 'Hongik Ingan Humanitarianism' and Accompaniment Society.

Analysis of the Marital Relationship in "Vegetarian" of the Han Gang : Focusing on Object Relation Theory (한강의 「채식주의자」 부부 관계 분석 : 대상관계이론을 중심으로)

  • Choi, Ji-Won
    • The Journal of the Korea Contents Association
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    • v.20 no.12
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    • pp.582-592
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    • 2020
  • The purpose of this research is to analyze the psychological dynamics of the characters in the novel 'vegetarian' of the Han Gang and the relationship patterns in the system by applying object relation theory. 'Vegetarianism' has already been analyzed and reinterpreted in various angles, but if you look at it from the object relationship theory and the systematic perspective, you can understand the inevitable history of the generation through psychological analysis and relation dynamics of the person. First, we will analyze the psychological dynamics of the characters by analyzing the meanings and exploring the meaning with the object relation theory and concept. The psychological analysis and the search process of the characters based on the theory are enough evidence for the counselor to reinterpret the life story of the client in the future clinical scene. In addition, in order to realize ethical but practical clinical education, the field of clinical practice will be extended when analyzing the characters using art. It is suggested that the meaning search through various character analysis needs to be accumulated culturally.

사회복지관 실습지도 내용에 대한 내용분석 연구

  • Lee, Si-Yeon
    • 한국사회복지학회:학술대회논문집
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    • 2005.04a
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    • pp.703-719
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    • 2005
  • 본 연구는 사회복지관에서 이루어지는 실습 내용을 분석하여 효과적인 실습지도를 위한 실천적 지침을 제시하고, 궁극적으로 실습 성과 평가를 위한 기초 자료를 제공하는데 목적을 두고 있다. 이틀 위해 서울시에 소재한 사회복지관 30개소의 실습지도계획서를 내용분석 연구방법을 사용하여 분석하였다. 그 결과, 사회복지관에서 진행된 실습 내용을 일반주의 실천에 근거하여 5개 범주, 14개 단위로 세부 내용을 추출하였다. 각 범주는 클라이언트 체계 개입, 조직 환경 이해, 전문적 발달, 서비스 전달체계 이해, 기본적 대인관계 기술의 순으로 전체 실습 내용에서 차지하는 빈도가 높게 나타났다. 이러한 결과를 바탕으로 효과적인 사회복지현장실습을 위한 이론적 실천적 함의를 제시하였다.

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An Action Research for the Practical Construction of the Constructivist Geography Education II (구성주의 지리교육의 실천적 구성을 위한 현장 연구 II)

  • 송언근
    • Journal of the Korean Geographical Society
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    • v.36 no.1
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    • pp.15-34
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    • 2001
  • This is the second segment of an action research on the constructivist geography education.(1)Deeper and lasting construction of knowledge may be possible especially when some key or leading concepts are utilized, around which other related concepts may be further explored. (2) Graphic languages may be more pedagogically effective than any other language, when they are viewed as means of learning may be the teacher's questioning, cooperative discussion, and the teacher's guidance and assistance. The questioning by the teacher seems effective when it is appropriate to the different levels of learner's comprehension, and cooperative discussion among thern seems productive with the teacher's attentive guidance. And, (5) constructivism may best be understood when teachers try to embody it in their own classrooms. This may be part of the context in which action research is called for.

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Social-Cognitive Model of Social Justice Interest and Commitment: for Korean College Students (사회 인지 관점에 따른 사회 정의 관심과 실천 모형의 검증: 국내 대학생을 중심으로)

  • Moon-Kyung Min;Hyun-nie Ahn
    • Korean Journal of Culture and Social Issue
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    • v.20 no.2
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    • pp.133-154
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    • 2014
  • The purpose of this study was to investigate psychological processes based on the Korean college students' development of social justice interest and commitment. For this study, we replicated Miller and colleagues'(2009) study, which explained the development of social justice interest and commitment by social-cognitive career theory(SCCT). Social desirability was controlled, and then self-reports data from 343 college students were analyzed using Structural Estimate Modeling(SEM). As a result, the final research model that social justice self-efficacy and outcome expectations affect social justice interest and commitment was proven valid for Korean college students. Also, in comparison with the direct effects model(social supports and barriers affect directly on commitment), the indirect effects model(social supports and barriers affect indirectly on commitment through self-efficacy) was supported. As an unique path of social-justice domain, the indirect effect by social support on commitment through outcome expectation was proved, as well. This study covers measurement limitations, future directions for research, and some lessons points with regards to how Korean college students to have social justice interest and commitment.

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Development of an Instructional Design Model for Practical Problem-Based Learning in Practical Arts Based on the Backward Design Model (백워드 설계 모형에 기초한 실과 실천적 문제 중심 수업 설계 모형 개발)

  • Lee, Eun-young;Choi, Ji-Yeon;Chae, Jung-Hyun
    • Journal of Korean Home Economics Education Association
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    • v.31 no.2
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    • pp.155-175
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    • 2019
  • This study aimed to present a concrete and systematic lesson design model for practical problem-based learning in Practical Arts based on the backward design model. To this purpose, this study was conducted in the following four stages: analysis, design, development, and evaluation. In the analysis stage, the literature related to the practical-problem-based curriculum and the instructional design model were reviewed as the theoretical foundations, and the 2015 revision of Practical Arts curriculum was analyzed. In the design stage, based on the literature review, the stages and sub-elements of practical-problem-based learning in Practical Arts were determined, and a template of instructional design was constructed. In the development stage, the design model was drafted based on the stages and sub-elements determined at the design stage. In the evaluation stage, the drafted design model from the development stage was evaluated, modified, and enhanced through expert verification. Based on the suggestions from the experts, the 'practical problem setting' stage was added to the original three-stage model, resulting in a model composed of the following four stages: practical problem setting, goal setting, evaluation planning, and learning activity planning. The experts appraised that the developed model of practical-problem-based instructional design in Practical Arts to be a systematic template that would serve as a concrete guideline for teachers who are trying to design classes based on practical problems.

Exploring the Theoretical Trends of an Integrated Environmental Design (통합적 환경설계 이론 기초 연구)

  • Ahn, Myung-June;Pae, Jeong-Hann
    • Journal of the Korean Institute of Landscape Architecture
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    • v.37 no.2
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    • pp.14-25
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    • 2009
  • We live in an age which is exponentially growing as the knowledge paradigm is changing. New sites are subject to contemporary landscape architecture function as "fields" in which this hybrid aspect is both actively practiced and becoming a catalyst for change in the area of landscape architecture. With this as its background, this study attempts to deal with how the aspect of integration in environmental design is manifested. For this purpose, the tendencies for the discussion of integration in various fields of practice were examined: planning theories, urban theories, architecture, public environment, engineering, and landscape architecture. As yet, the discussions of interdisciplinary integration, which occur in practice in these respective fields, mainly tend to be oriented toward the effective implementation of the merits of other related fields. Seen from these examples of practice, integrated design approaches can be found in the following three aspects: design objects, respective professional areas, and methodologies of approaches and design. In terms of design objects, the positions of individual design subjects present themselves as most obvious, and integration or combination of the physical targets that come to exist through design can be easily seen. Most examples of integration turn out to be this, in almost every case of which the theme and the target of expression are integrated via a small number of certain methods. In terms of professional areas, what can be mainly evidenced is how the individual subject acts when the subject designs. The strong points of professionals from each field seem to create synergy, achieving through integration optimum results. In terms of methodologies of approaches and design, there are attempts to create integrated approaches as ways of effective decision-making, in which case the integration of all of the interest parties is of primary concern. As yet, few instances have been found in which integrated design has had enough strength to be seen as a concrete design methodology based on practical examples. However, it is encouraging that theoretical approaches and the necessity for integrated design have been identified from multiple perspectives, and that a practical movement such as landscape urbanism has come into active being. The authors of this study find this point in time to be ripe for discussions on integrated practices in terms of environmental design, on the basis of the synthetic approaches mentioned above.

Environment, Drivers and Dynamics of Socio-technical System Transition and STI Policy for the Transition Management

  • Park, Sang-Ook
    • Journal of Science and Technology Studies
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    • v.11 no.1
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    • pp.61-88
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    • 2011
  • This paper presents theoretical discussions on socio-techical system transition, by shedding light on the STS context. With a rising attention paid by STI policy researchers, the socio-technical system perspective seems particularly promising in applying to the pursuit for the sustainable development. The normative strand in STI policy research has been strongly influenced by the STS tradition that emphasizes active and participatory roles not only of academian but also of science and technology. Throughout reviewing the development of the socio-technical system perspective, its theoretical components of environment, drivers and dynamics are discussed, often being linked to older perspectives. STI policy involves in socio-technical transition in a manner of transition management and governance, which is the final part of this paper.

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A Qualitative Study on the Mental Health Social Workers' Experiences Concerning Client's Self-determination (클라이언트의 자기결정에 관한 정신보건사회복지사의 실천 경험에 대한 연구)

  • Kim, Gi-duk;Jang, Eun-sook
    • Korean Journal of Social Welfare Studies
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    • no.39
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    • pp.83-113
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    • 2008
  • The purpose of the study is to explore the mental health social workers' experiences concerning client's self-determination by grounded theory, one of the qualitative method. Although a lot of previous studies has proved that the practitioners have suffered from the ethical considerations in their practice, on which the matter of client's self-determination is centered, little attention is paid to deep exploration of practitioners' real experience about those aspects. To carry out the research question, first, through literature reviews focusing on clarify the underlying issues about client's self-determination, three intrinsic clues are found out; incompetence, medical benefits, the harm to the third party. Data obtained by in-depth interview with 10 participants are analyzed by employing the methode developed by Corbin and Strauss, which could categorize the raw data into several high-level concepts and constructs. The findings of the study show that most practitioners would consider the clients as the intrinsic subject of self-determination. Therefore, in practice, they are trying to support the client's self-determination even within the some constraints. In addition, they also experience the clients' latent potential in actualizing autonomy and self-determination, and identifies the positive effect of self-determination not only on the client's self-help and mental health but also on the practitioners themselves. The results of the study clearly suggests that it is critical to provide the practitioners with adequate ethical education and training to help them to overcome their ethical suffering concerning clients self-determination.