• Journal for History of Mathematics
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• v.24 no.1
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• pp.63-73
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• 2011

This paper analyses conceptual change from Euclid's dictionary definition to Hilbert's mathematical definition about primitive terms in Geometry. Realism, conceptualism, nominalism about mathematical objects are related to this conceptual change.

• Journal of Internet Computing and Services
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• v.8 no.5
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• pp.81-89
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• 2007

In this thesis, we propose ontology based context-aware recommendation system using concept hierarchy(OCARCH), Context-aware recommendation services are useful to provide an user with relevant information and/or services bared on his current context, However several approaches to context-aware recommendation system have been already proposed, each of them provide information without considering level of information concept bared on his current context, For this reason, we propose OCARCH as system capable of helping people to find their way quickly and easily through large amounts of information by determining level of information concept based on his current context, We are also using prefetching algorithm to store recommendation information that the user is likely to need in the near future based on current predictions, Therefore the OCARCH enables users to obtain relevant information efficiently, Several experiments are performed and the experimental results show that the proposed system provides more effective than conventional context-aware recommendation system.

• Journal of Digital Convergence
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• v.15 no.12
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• pp.393-402
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• 2017

This is a study path analysis for relationship among multicultural perception(MP), cultural competence(CC) and professional self-concept(PSC). The survey was performed on 245 nursing students in one university. Data was collected using structured questionnaire and analysed with PASW 18.0, AMOS 18.0. Model fit indices were in good agreement with recommended level($x^2/df=1.170$, GFI=.992, AGFI=.970, RMSEA=.027, CFI=.995, NFI=.967). Based on path model CC showed a direct effect on PSC while MP, satisfaction in major(SM), and interpersonal relationship(IR) showed a indirect effect. The MP and SM showed a direct effect on CC while IR showed a indirect effect and SM and IR showed a direct effec on MP. The findings indicate the necessity of developing educational programs to enhance nursing student's MP and CC for increasing of PSC.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.40 no.6
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• pp.90-97
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• 2003

This paper proposes a speech recognition based on HMM(Hidden Markov Model) using FSVQ(First Section Vector Quantization) and fuzzy concept. In the proposed paper, we generate codebook of First Section, and then obtain multi-observation sequences by order of large propabilistic values based on fuzzy rule from the codebook of the first section. Thereafter, this observation sequences of first section from codebooks is trained and in case of recognition, a word that has the most highest probability of first section is selected as a recognized word by same concept. Train station names are selected as the target recognition vocabulary and LPC cepstrum coefficients are used as the feature parameters. Besides the speech recognition experiments of proposed method, we experiment the other methods under same conditions and data. Through the experiment results, it is proved that the proposed method based on HMM using FSVQ and fuzzy concept is superior to tile others in recognition rate.

• 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.

• Journal of The Korean Association For Science Education
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• v.24 no.3
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• pp.499-518
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• 2004

This study focused on research that illustrates the important interplay between learners' epistemological beliefs about science knowledge, physics textbook knowledge and knowing physics in the classroom. Also this study investigated learners' conceptual changes on the value of mechanical energy. To explore these topics, six sophomores were chosen as participants. Three categories were introduced to classify how participants' understanding of the nature of science knowledge, physics textbook knowledge has been linked with epistemological beliefs of knowing physics. The three categories were (1)receiving physics knowledge as authority, (2)receiving physics knowledge as the perception of teacher's role and (3)understanding physics knowledge as the perception that science knowledge is a product of a variety of human ideas. These categories were also concerned with construction of individual conceptions of mechanical energy. The participants who understood physics knowledge as the perception that science knowledge is a product of a variety of human ideas naturally used metacognitive strategy in classroom compared to other participants. And they had scientific conceptions about the value of mechanical energy. Others who were passive in classroom had unscientific conceptions about the value of mechanical energy due to definition of energy and epistemological beliefs about the nature of science knowledge. In the process of their conceptual changes on the value of mechanical energy, it was important to understand an instrumental aspect of scientific knowledge and to think about the relation between formulae and physical phenomena.

• Journal of The Korean Association For Science Education
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• v.30 no.5
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• pp.636-646
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• 2010

The purpose of this study is to confirm secondary biology teachers' recognition about cell and gene concepts that should be taught in biology according to each school level and to classify the concepts into essential, optional and non-essential ones. We developed a questionnaire in consultation with 5 biology professors after selecting some biological concepts from some data about the recommendations of BSCS, biology, study for the connection with biological contents in each school level. This survey was conducted to biological teachers in secondary schools (146 individuals) from all over Korea for studying the concepts of the cell and gene in elementary and secondary schools. The results of this study revealed the following: The number of essential concepts in the cell and gene domain increases as the school levels go up. Moreover, secondary biology teacher recognized that there must be much more cell and gene concepts that should be taught in elementary and secondary schools compared to those suggested in the science curriculum and BSCS' recommendation.

• Proceedings of the SCSK Conference
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• 2004.09a
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• pp.1-8
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• 2004

고령화사회(aging society)에서 매우 빠른 속도로 고령사회(aged society)에 다가가고 있는 우리나라는 노인에 대한 개념을 새롭게 재정비하고 장수고령사회에 대비한 새로운 문화를 창출하여야 할 때이다. 노화란 개념에 대해서도 불가피하고 비가역적인 생체의 변화를 통한 죽음에 이르는 도정이라는 결정론적 시각을 불식하고, 노화현상은 생명체의 생존을 위한 적응적 반응성 변화라는 사실을 분명하게 하고, 그러한 변화의 요인이 제어가 가능한 생체의 변화임을 인식하여 노화 및 노인 문제에 대하여 새롭게 대처하여야 할 필요가 대두되고 있다. 아울러 노화현상에 대한 새로운 가설인 노화대문설(Gate theory of aging)의 기본을 설명하고 이를 바탕으로 한 기능적 장수(functional longevity)의 개념을 정리해본다.

• The Science & Technology
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• no.3 s.454
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• pp.82-87
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• 2007

고령사회로 들어서면서 장수의 개념에 대한 인식을 새롭게 해야 할 필요성이 커지고 있다. 장수라는 용어를 단순한 연령적, 시간적 개념이 아니라 사회적 측면에서 보다 능동적이고 적극적인 삶을 영위할 수 있는 새로운 계층의 출현이라는 개념으로 인식해야 할 시점이 된 것이다. 새롭게 도출되는 장수문화란 종래의 연령적 특수계층인 고령자 중심의 노인문화라는 개념이 아니라 고령사회에서 사회구성원인 인간들이 남녀노소 모두 함께 어우러져 인간으로서의 존엄성을 유지하면서 건강하게 살고 사회적 책임을 다할 수 있는 관념 및 규범체계가 아닐까?

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.23 no.1
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• pp.179-194
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• 2012

This study explored the concept of context-aware computing and its application to the library and information services. Context-aware computing represents mobile computing techniques which gather, analyze user's contextual information and provide appropriate information services for the specific user. The idea was proposed in the late 90's but it was not widely available to the public because of the technology limitation. Recent technology development made context-aware computing possible to apply to our everyday-life information seeking using smart phone and showed the usefulness of its application. This study introduced the concept of context-aware computing with some examples of it, and finally tried to propose some of its applications to the library and information services.