• Proceedings of the Safety Management and Science Conference
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• 2004.11a
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• pp.439-445
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• 2004

1895년에 독일 뢴트겐에 의해 발견된 이후 X선은 1896년부터 의료목적으로 사용된 기록이 있으며, 한국에 도입되어 진단용X선발생장치로서 환자 진료에 사용하기 시작한 역사는 1911년경부터 조선총독부의원과 세브란스의원에 도입되어 사용하게 되었다. 최근 의학 및 의용공학의 발전으로 방사선을 이용한 진단 기술의 발전과 건강에 대한 국민의 의료욕구가 증가함에 따라 방사선을 이용한 질병의 진단과 치료 방법에서 새로운 기법이 개발되고 그 이용은 지속적으로 증가되고 있는 추세이다. 방사선의 이용은 진단 및 치료에 중대한 이득을 제공하고 있으나 그 이면에는 최적화 및 정당화 되지 않은 방사선의 피폭으로 장애 및 유해요인이 초래되는 것은 부인할 수 없다. 이와 관련하여 방사선을 이용하여 검사 및 치료를 시행함에 있어 피폭선량 최적화를 위한 기술적 노력은 방사선 관계자의 막중한 의무이다.

• The Korean Journal of Financial Management
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• v.9 no.2
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• pp.1-29
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• 1992

자본자산(資本資産) 가격결정(價格決定)의 소비기저모형(消費基低模型)은 자본시장의 성질들을 깊이 있게 반영한 모형이지만 이 모형을 정립하는 데 사용된 효용함수의 형태가 주어지지 않고 있다. 이 효용함수의 형태는 실증분석을 통하여 결정되어야 한다. 이 논문에서는 소비기저모형에 사용될 수 있는 효용함수(效用函數)로서 기대효용함수(期待效用函數), 화폐효용함수(貨幣效用函數)와 비기대효용모형(非期待效用模型)을 상정하고 우리나라의 데이터를 사용하여 이 중 어느 함수(函數)가 우리나라의 투자활동과 자산의 가격결정에 적합한가를 실증적으로 분석하였다. 그 결과 상대적 위험기피계수는 대략 4이고 주관적 할인율이 0.8정도이며 소비기저모형(消費基低模型)을 정당화시키는 효용함수(效用函數)는 비기대(非期待) 모형(模型)임이 발견되었다.

• Korean Journal of Logic
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• v.14 no.3
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• pp.85-100
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• 2011

Recently Byeong Deok Lee has denied the validity of the so-called uncontested principle, which says that the indicative conditional implies the material conditional. I show that his denial means that modus ponens is not valid and that the truth-conditions of indicative conditionals are weaker than that of material conditionals. It seems that what made him hold this view is related to some misunderstanding of indicative conditionals.

• The Mathematical Education
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• v.46 no.4
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• pp.423-443
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• 2007

Based on the framework of Huffered-Ackles, Fuson and Sherin(2004), data were analyzed in terms of 3 components: explaining(E), questioning(Q) and justifying(J) of students' mathematical concepts and problem solving in a math classroom. The students used varied presentations to explain and justify their mathematical concepts and ideas. They corrected their mathematical errors or misconceptions through discourses. In addition, they constructed and clarified their concepts and thinking while they were interacted. We were able to recognize there was a special feature in discourses that encouraged the students to construct and develop their mathematical concepts. As they participated in math class and received feedback on their learning, the whole class worked cooperatively in a positive way. Their discourse was improved from the level of the actual development to the level of the potential development and the pattern of interaction moved from ERE(Elicitaion-Response-Elaboration to PD(Proposition Discussion).

• The Mathematical Education
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• v.53 no.2
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• pp.185-200
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• 2014

교사의 자기 효능감은 그 교사가 실제로 잘 가르칠지를 예측하는 매우 강력한 구인이다. 본 연구는 우리나라의 초등 예비교사들이 수학을 가르치는데 대한 효능감을 측정하는 정당한 척도를 개발하는 것이다. 먼저, 문헌조사로부터 개인효능감과 결과기대감의 두 개 변인에서 58개의 문항을 개발하였고, 표본 크기 919인 자료 위에서 정규성 검사를 실시하였다. 다음에 전체 자료를 크기가 각각 419와 500인 두 개의 표본으로 나누었고, 첫째 표본에서 신뢰도 검사 및 탐색적 요인 분석을, 둘째 표본에서 확인적 요인 분석을 실시하였다. 최종적으로 개인효능감 변인에서 12 문항, 결과기대감 변인에서 6 문항 등 총 18개의 문항으로 구성된 수학교수효능감척도(MTES)를 개발하였다.

• Journal of Biomedical Engineering Research
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• v.22 no.1
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• pp.91-99
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• 2001

청각기관에서 소리가 전달되어지는 과정에 대한 이론적인 전기/기계적 모델이 이루어진다면 이명환자의 분류 및 전기자극을 이용한 치료방법의 선택에 크게 기여할 수 있을 것이다. 본 연구에서는 기존 청각기관의 모델에 대한 장단점을 파악하여 이를 보완하는 실제의 시스템에 가장 근접한 모델을 수립하고, 청각시스템의 변화를 객관적으로 관찰할 수 있는 이론적인 배경을 수립하고자 하였다. 즉, 유모세포의 상면을 질량을 가진 성분으로 가정하고 그러한 질량의 경도와 제동을 위한 소자들을 첨가하여 새롭게 청각 모델을 수립하였다. 그리고 수립된 모델을 수학적으로 해석하여 전달함수의 영점이 극점보다 작게 나타남으로써 신경 조율 데이터를 이용한 기존의 연구와 일치함을 확인할 수 있었고, 제동주파수와 극점 주파수의 관계에 대한 가정들이 정당화됨을 확인할 수 있었다.

• Journal for History of Mathematics
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• v.36 no.4
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• pp.61-78
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• 2023

By virtue of the characteristics inherent in diagrams, diagrammatic reasoning has potential and limitations that distinguish it from general thinking. It is natural that diagrams rarely appeared in Joseon mathematical books, which were heavily focused on computation and algebra in content, and preferred linguistic expressions in form. However, as the late Joseon Dynasty unfolded, there emerged a noticeable increase in the frequency of employing diagrams, due to the educational purposes to facilitate explanations and the influence of Western mathematics. Analyzing the role of diagrams included in Jo Taegu's 'JuseoGwangyeon', an exemplary book, this study includes discussions on the utilization of diagrams from the perspective of mathematics education, based on the findings of the analysis.

• Journal of the Korean Society of Radiology
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• v.83 no.4
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• pp.783-791
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• 2022

The radiation emitted during radiological examinations can be harmful to the human body, but the technique is still used because it is helpful to the patient. Therefore, radiologic examinations must follow radiation protection principles such as justification and optimization, and only minimal required re-examinations should be performed. Proper use of radiation in the medical field can be achieved by proper education of individuals from multiple medical fields.

• Journal of The Korean Association For Science Education
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• v.19 no.1
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• pp.41-61
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• 1999

In this study I defined the direction Integrated Science Education(ISE) should take. So that I groped for the direction ISE should take in the inherent nature of science and education, analyzing their respective validity from philosophical and psychological angles. Based upon these researches, I formulated the three directions for ISE to take; knowledge-centered, social problem-centered, and individual interest-centered. The results of this thesis may be summed up as follows: 1. The knowledge-centered ISE that thinks the inherent nature of science is in the scientific knowledge is based upon Hirst's integrated logic which is built on discipline-centered educational viewpoint. Now, the focus of interdisciplinary integration consists in clarifying the meanings of knowledge and the logical relations between one knowledge and another according to the respective form of exploration. The knowledge-centered ISE, therefore, was analyzed to find its justification in the educational philosophy of idealism, realism, neo-scholasticism; in the educational theories of essentialism, behaviorism, perennial ism; in the scientific philosophy of empiricism. positivism; in the educational psychology of developmental psychology and constructivism. 2. The social problem-centered ISE that thinks the inherent nature of science is the process of social concord is based upon Dewey's integrated logic which is built on experience-centered educational viewpoint. Now, the focus of interdisciplinary integration consists in the methodological aspect facilitating the process of experience. The social problem-centered ISE, therefore, was analyzed to find its theoretical justification in the educational philosophy of pragmatism; in the educational theory of progressivism; in the scientific philosophy of relativism and rationalism; and in the educational psychology of developmental psychology and constructivism. 3. The individual interest-centered ISE is based upon Patterson's integrated logic which is built on human-centered educational viewpoint. The focus of education here is self-realization. Therefore, rather than provide in learning conditions from outside, one is made to choose them oneself and the process of satisfying one's motive is emphasized. The individual interest-centered ISE, therefore, was analyzed to find its theoretical justification in the educational philosophy of existentialism; in the educational theory of humanism; in the scientific philosophy of relativism; and in Gestalt psychology.

• Journal of The Korean Association For Science Education
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• v.37 no.4
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• pp.565-575
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• 2017

This study analyzes the epistemic considerations and the argumentation level revealed in the discourse of the key concept of natural selection for science-gifted elementary students. The paper analyzes and discusses the results of a three-student focus group, drawn from a cohort of twenty gifted sixth-grade elementary students. Nature, generality, justification, and audience were used to analyze epistemic consideration. Learning progression in scientific argumentation including argument construction and critique was used to analyze students' scientific argumentation level. The findings are as follows: First, Epistemic considerations in discourse varied between key concepts of natural selection discussed. The nature aspect of epistemic considerations is highly expressed in the discourse for all natural selection key concepts. But the level of generality, justification and audience was high or low, and the level was not revealed in the discourse. In the heredity of variation, which is highly expressed in terms of generality of knowledge, the linkage with various phenomena against the acquired character generated a variety of ideas. These ideas were used to facilitate engagement in argumentation, so that all three students showed the level of argumentation of suggestions of counter-critique. Second, students tried to explain the process of speciation by using concepts that were high in practical epistemic considerations level when explaining the concept of speciation, which is the final natural selection key concept. Conversely, the concept of low level of epistemic considerations was not included as an explanation factor. The results of this study suggest that students need to analyze specific factors to understand why epistemological decisions are made by students and how epistemological resources are used according to context through various epistemological resources. Analysis of various factors influencing epistemological decisions can be a mediator of the instructor who can improve the quality and level of the argumentation.