• Journal of Science Education
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• v.32 no.1
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• pp.19-32
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• 2008

The purpose of this study was to identify the influence of using the concept cartoons about middle school students' science attitude in the lessons on water cycle unit. For the purpose, they were developed to the learning program with concept cartoon and the instrument for the science attitude which has four categories; attitudes about science, attitudes about science subject, learning motives for science subject, and scientific attitudes. The research method was designed to quasi-experimental design. The concept cartoon was provided to the experimental group during nine lessons. Before and after the lessons in all two groups, the pre-post tests with the instrument were performed. The results from twice t-tests were shown that the domain of learning motives for science subject was only improved. From these, it were indicated that the concept cartoon was not effective all areas in science attitude, therefore the use in science lessons need to be restricted within narrow purpose.

• Journal of the Korea Society of Computer and Information
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• v.16 no.7
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• pp.173-181
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• 2011

This study investigated the effects of self concept on impulsive purchase and after-buying emotional response. For these purposes, researcher compared the impulsive purchasing and after-buying emotional response by socially independent-dependent groups in self concept. The results of present research were as follow: First, impulsive purchase led to high after-buying emotional response such as guilt, regret, happiness, but it did not in pride. non-impulsive purchase led to high pride. Second, socially independent self concept led high impulsive purchase. Third, socially independent self concept moderated the effect of impulsive buying on guilt, regret, happiness, but it did not in pride also. These results show that socially independent consumers in self concept purchase cell-phone impulsively and have high guilt, regret, happiness in after-buying emotion. But the low pride would be interpreted that they don't think their impulsive purchases desirable.

• School Mathematics
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• v.18 no.3
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• pp.647-666
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• 2016

This study investigates pre-service teacher's understanding of the concept and representations of irrational numbers. We classified the representations of irrational numbers into six categories; non-fraction, decimal, symbolic, geometric, point on a number line, approximation representation. The results of this study are as follows. First, pre-service teachers couldn't relate non-fractional definition and incommensurability of irrational numbers. Secondly, we observed the centralization tendency on symbolic representation and the little attention to other representations. Thirdly, pre-service teachers had more difficulty moving between symbolic representation and point on a number line representation of ${\pi}$ than that of $\sqrt{5}$ We suggested the concept of irrational numbers should be learned in relation to various representations of irrational numbers.

• Journal of Digital Convergence
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• v.17 no.11
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• pp.259-268
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• 2019

This study was done to examine interpersonal relations, professional self-concept and hope in single female nurses. A survey using a structured questionnaire was conducted with 219 nurses who work in one of six general hospitals in the large cities. The data were collected from August 17, 2012 to September 14, 2012. Collected data were analyzed using t-test, One way ANOVA, Pearson's Correlation Coefficient, Hierarchical Regression Analysis with using SPSS Windows 25.0. There was a significant difference in interpersonal relations, professional self-concept and hope according to participants' characteristics. Participants' interpersonal relations, professional self-concept and hope were all found to have statistically significant correlations (r=.26-.45, p<.001). Participants' general characteristics, interpersonal relations, and professional self-concept explained 26.4% of variance in hope levels. Findings from this study should be useful in the development of programs to promote participants' hope with interpersonal relations and professional self-concept.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.4 no.1
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• pp.49-58
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• 1984

This paper is to exhibit the numerical analysis of sediment transport in the slowly varing flow and the sediment transport relation between the steady and the unsteady flow in the alluvial stream. The gradually varied flow of alluvial stream and the sediment transport are very complicated physical phenomen. Therefore the mathematical modeling is needed to be established. Linear implicit means of modified indirect method are applied to sediment transport by numerical analysis instead of the conception of steady flow in order to decrease errors. Further more, this study has purpose on reasonable prediction of the river-bed variation by way of this numerical method.

• Korean Journal of Logic
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• v.17 no.2
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• pp.349-358
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• 2014

Human being has attempted to solve the problem of imperfect knowledge for a long time. In 1982 Pawlak proposed the rough set theory to manipulate the problem in the area of artificial intelligence. The rough set theory has two interesting properties: one is that a rough set is considered as distinct sets according to distinct knowledge bases, and the other is that distinct rough sets are considered as one same set in a certain knowledge base. This leads to a significant philosophical interpretation: a concept (or an event) may be understood as different ones from different perspectives, while different concepts (or events) may be understood as a same one in a certain perspective. This paper claims that such properties of rough set theory produce a mathematical model to support critical realism and theory ladenness of observation in the philosophy of science.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.6
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• pp.52-58
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• 2005

The concept of the Micro-Grid comprising Micro-Sources supplying both heat and power ranging from several [KW] to 1[MW] to local customers is proposed by CERTS(Consortium for Electric Reliability Technology Solutions). Micro-Sources adopt environmentally friendly and reliable power sources such as Fuel-Cell and Micro-Turbines. Micro-Sources adopt voltage source inverter with AC grid system in order to provide independent real and reactive power control for premium power quality. Thus Micro-Source needs series inductance for interfacing with AC grid system. With this reason, we propose a technique that can decide the optimal size of the inductor for effective transfer of the power into the grid.

• Journal of Digital Convergence
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• v.10 no.11
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• pp.261-269
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• 2012

The purpose of this study was to suggest policies that take advantage of social networking services in the field of social commerce. Presented it, in order for the concept of a social network service for the first time, were examined by four representative types of social network services, and analyzed the characteristics of each. Domestic current status and concepts presented and the addition of social commerce, and analyzed the characteristics of each type proposed six kinds. Utilizing social network services to the end, was to suggest measures that can be incorporated into the social commerce business. The results of this study suggested that the marketing implications for how social network services in the social commerce business that can be utilized in companies that will say that its worth.

• Korean Journal of Social Welfare
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• v.45
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• pp.185-219
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• 2001

The purpose of this study is to explore the concept of social exclusion and underclass and to find out their implication for the poverty policy in Korea. Social exclusion as a concept, on the other hand, offers a broader perspective in addressing multi-dimensional disadvantage, especially in relation to social policy. The term underclass offers a convenient metaphor for use in commentaries on inner city crises because it evokes three widely shared perceptions: novelty, complexity, and danger. Conditions within inner cities are unprecedented; they cannot be reduced to a single factor; and they menace the rest of us. Open debate on the underclass accelerated in 1977 when Time magazine announced the emergence of a menacing underclass in America's inner cities. Drugs, crime, teenage pregnancy, and high unemployment, not poverty, defined the 'underclass,' most of whose members were young and minorities. With the publication in 1982 of Ken Auletta's Underclass, the word secured it dominance in the vocabulary of inner-city pathology. As implications for Korean poverty policy of the concept of social exclusion and underclass, the establishment of multi-dimensional concept of poverty, development of multi-dimensional approach of social work, improvement of National Basic Life Guarantee System, research on employment policy in social welfare field, and research on housing policy for the poor were suggested.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.1961-1964
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• 2003

웹서비스에 대한 높은 관심과 함께 그 실현이 점차 가시화되고 XML로 이루어진 지원 기술들의 전폭적인 지지로 잠재력은 더욱 확대되고 있다. 웹서비스는 기존 웹 기반의 디스플레이에 그쳤던 단순정보 교환을 애플리케이션 차원에서 데이터를 통신할 수 있어 개발 가능성이 무한한 프레임워크로 각광받고 있다. 전자상거래 분야도 예외는 아니어서 웹서비스의 기본 개념을 이용하여 프레임워크를 구성하려는 노력이 진행되고 있다. 이에 따라 인증분야에서도 한계점이 드러나게 되었고 각 시스템마다 존재하는 많은 인증 정보관리 문제가 부각되고 있다. OASIS에서는 웹서비스의 등장과 함께 SAML이라는 표준 인증 방식을 제시하였다. SAML은 XML기반의 표준화된 인증방식을 취하여 안전성과 확장성 뿐만 아니라 인증 간 상호운용성을 제공하는 강력한 기능을 가지고 있다. 본 논문에서는 SAML을 이용한 SSO(Single Sign On)와 접근권한에 대한 적용개념을 소개하고 SAML인증서버를 이용한 Web Services인증 모델을 제시하고자 한다.