• Title/Summary/Keyword: 소수의 의미

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A study on improper notions appeared in dealing with quotient and remainder in division for decimal numbers in Korean elementary math textbooks and its improvements (우리나라 초등학교 수학 교과서의 소수 나눗셈에서의 몫과 나머지 취급에서 나타나는 부적절한 관념과 그 개선에 관한 연구)

  • Park, Kyosik;Kwon, Seokil
    • Journal of Educational Research in Mathematics
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    • v.22 no.4
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    • pp.445-458
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    • 2012
  • Current textbooks may provide students and teachers with three improper notions related to the quotient and the remainder in division for decimal numbers as in the following. First, only the calculated results in (natural numbers)${\div}$(natural numbers) is the quotient. Second, when the quotient and the remainder are obtained in division for decimal numbers, the quotient is natural number and the remainder is unique. Third, only when the quotient cannot be divided exactly, the quotient can be rounded off. These can affect students and teachers on their notions of division for decimal numbers, so improvements are needed for to break it. For these improvements, the following measures are required. First, in the curriculum guidebook, the meaning of the quotient and the remainder in division for decimal numbers should be presented clearly, for preventing the possibility of the construction of such improper notions. Second, examples, problems, and the like should be presented in the textbooks enough to break such improper notions. Third, the didactical intention should be presented clearly with respect to the quotient and the remainder in division for decimal numbers in teacher's manual.

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2018 정보보호 R&D 챌린지 - 차량주행 데이터기반 도난탐지 트랙 -

  • Kwak, Byung Il;Kim, Huy Kang
    • Review of KIISC
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    • v.29 no.1
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    • pp.13-19
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    • 2019
  • 나날이 발전하고 있는 ICT 기술과 차량과의 융합은 차량을 대상으로 하는 사이버 위협과 공격을 더욱 증대시킨다. 그러나 차량 보안을 연구하는 산업계, 학계 연구 그룹들 또한 다양한 접근 방법을 통해 이러한 위협과 공격을 앞서 예방하고 탐지하기 위해 노력하고 있다. 2018 정보보호 R&D 데이터 챌린지에서는 차량주행 데이터기반 도난탐지 트랙을 마련하였다. 이는 운전자별 주행 데이터에 대한 분석을 통해 현재 주행 중인 운전자를 식별하는 챌린지로써 국내 및 해외에서 처음으로 진행된 트랙이다. 이번 2018 정보보호 R&D 데이터 챌린지 중 차량주행 데이터기반 도난탐지 트랙에 참가한 참가자들은 주행 데이터를 통계적 기반으로 분석하여 모델링 하였으며, 분석하는 과정에 있어 의미 있는 분류 결과를 도출해 내었다. 일반적으로, 한 가정이 보유하고 있는 차량이 가족들 이외 다른 이들에게는 잘 공유되지 않는다는 점을 고려한다면, 비록 소수의 운전 참가자이지만 5명을 대상으로 하는 본 실험이 의미가 있다고 본다. 이번 정보보호 R&D 데이터 챌린지를 통해, 운전자 주행 데이터가 도난 탐지를 위한 운전자 분류뿐만 아니라, 운전자에게 특화된 의료와 보험과 같은 맞춤형 서비스를 제공할 수 있는 가능성을 확인할 수 있었다.

An Analysis of Pre-service Teachers' Pedagogical Content Knowledge about Decimal Calculation (소수연산에 관한 예비초등교사의 교수내용지식 분석)

  • Song, Keun-Young;Pang, Jeong-Suk
    • Journal of Elementary Mathematics Education in Korea
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    • v.12 no.1
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    • pp.1-25
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    • 2008
  • The purpose of this study was to identify pre-service teachers' Pedagogical Content Knowledge (PCK) about decimal calculation. A written questionnaire was developed dealing with decimal calculation. A total of 152 pre-service teachers from 3 universities were selected for this study; they had taken an elementary mathematics teaching method course and had no teaching experience. The results were as follows: First, with regard to the method of decimal calculation, most pre-service teachers were familiar with algorithms introduced in the textbook. But with regard to the meaning of decimal calculations, they had difficulties in understanding decimal multiplication or decimal division with decimal number. Second, pre-service teachers recognized reasons of errors as well as errors patterns that student might make. But this recognition was limited mainly to errors related to natural number calculation. Third, pre-service teachers frequently commented about decimals algorithms, picture models, the meanings of decimal calculations, and connections to natural number calculations. Many of them represented the meanings of decimal calculations through picture models as to help students' understanding, while they just mentioned algorithms or treated decimal calculation as natural number calculations with decimal point.

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Effect of Hydrophobic Condition and Water Content on the Spectral Information of Soil Particle Surface (흙 입자 표면의 소수성 조건과 함수비가 분광정보에 미치는 영향)

  • Jeong-Jun, Park;Seung-Kyong, You;Kwang-Wu, Lee;Jung-Mann, Yun;Gigwon, Hong
    • Journal of the Korean Geosynthetics Society
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    • v.21 no.4
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    • pp.93-100
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    • 2022
  • This study describes the evaluation results on the effect of soil particle surfaces coated with various hydrophobic conditions on spectral information according to water content. Wettability test and spectral information evaluation test were performed on the hydrophobic coated standard sand. When the standard sand was coated with 1%, 3%, and 5% hydrophobic, the contact angles of sand-water interface were 130°~143°, 129°~144°, and 131°~144°, respectively. This means that the contact angle increased as the degree of hydrophobic coating increased at the same drying time, but the range of the contact angle had the same wettability. This means that the contact angle increases as the hydrophobic coating degree increases at the same drying time, whereas the contact angle range has the same wettability. As a result of spectral information evaluation, the maximum spectral reflectance of the dried sand with hydrophobic condition decreased compared to that of the hydrophilic sand, as the degree of hydrophobic increased. However, the maximum spectral reflectance was increased by increasing the degree of hydrophobic under the same water content conditions.

Image Analysis of Korean Automobiles Using Sensory Engineering (감성공학을 이용한 국산 승용차 이미지 분석)

  • Lee Jin-Choon;Hong Seong-Il
    • Journal of Korea Society of Industrial Information Systems
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    • v.11 no.2
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    • pp.69-78
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    • 2006
  • This paper is concerned with analyzing the images of Korean automobiles using, so called, sensory engineering, which adapts the sensory and subjective assessment of human beings in evaluating the quality of product. The methodology of analysis is suggested in this paper according to the following steps. First, 14 pairs of adjectives, which describe the image of object cars in view of the semantic differential method, are derived from consulting with several expert panels. Nextly, factor analysis is performed in order to obtain the axises, by which the images space of the object automobiles are specified, and then the images of the object automobiles are measured by the coordinate of all the object automobiles in the image space. In this paper, a sensory estimation experiment is performed to a panel consisting with In undergraduate students residing in the region of Daegu. From the result of analysis of this paper, target images, which the automobile manufacturers are intended, are achieved by and large except one company.

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Study on Acceleration of Building a Thesaurus by Means of Pre-applying of $\alpha$-cut ($\alpha$-cut 선적용에 의한 시소러스 구축의 가속화에 관한 연구)

  • 김창민;김용기
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 1997.10a
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    • pp.233-236
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    • 1997
  • 퍼지 관계 개념을 응용한 퍼지 정보 검색은 형태론에 입각한 기존의 정보 검색과는 달리 문서와 용어의 의미론에 근거하는 정보검색을 할 수 있다. 퍼지 정보 검색은 문헌의 집합 용어의 집합으로 나누고 문헌과 용어의 관계성을 문서 $\times$ 용어이 관계 행렬로 나타내며 퍼지 관계곱 연산을 이용하여 시소러스(thesaurus)를 형성하고 사용자로부터 주어진 질의 적합한 문서를 제공한다. 그러나 이러한 퍼지 관계곱 연산은 매우 큰 시간 복합도를 요구하는 연산이고 퍼지값은 부동소수점으로 표현해야하므로 대용량의 문서 시스템에 적용할 수 없어 비현실적이다. 부동소수점 연산은 연산속도가 느리고 저장공간도 많이 요구하므로 부동소수점 연산을 비트 연산으로 대체할 수 있다면 처리속도와 처리공간에 있어 성능 향상을 기대할 수 있다. 본 연구는 퍼지 정보 검색의 시소러스 형성에 있어 $\alpha$-cut 적용의 시기를 조정하여 성능을 향상하는 방법을 제안한다.

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Research on Culture Symbol Element about China Mongolian Culture Symbol Recognition and Establishment of National Identity (중국 몽고족 문화상징에 대한 인식과 민족 정체성 확립을 위한 문화상징요소 연구)

  • Hong, Xin;Guo, Yan
    • The Journal of the Korea Contents Association
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    • v.17 no.2
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    • pp.612-622
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    • 2017
  • This paper is about on the most representative ethnic of China Mongolian as the research object, through the questionnaire survey to establish the understanding of national cultural symbol and the system of national identity, and lay a theoretical foundation for the application of Mongolian communication and design in the future. In order to achieve the objectivity of the data, so a questionnaire survey was conducted on 300 populations of Mongolian and other nationalities. The result is that the majority of the Mongolians believe that as the Mongolian people have a sense of pride, and the Mongolian nationality is a representative of china. Mongolian is a kind of aesthetic, creative, reliable, aggressive and like the decoration of the nation. The cultural symbols for design elements are cyan, Gen Gi Khan graphics, agate, and peaceful meaning and so on. The cultural symbols are used for celebration, as well as clothing accessories. The symbol of culture has played a positive role in the establishment of Inner Mongolia identity and the propaganda of the nation. The construction of Mongolian cultural symbol system plays an important role in the establishment of Mongolian national identity. To combine the meaning of nation and the mission of culture with national cultural resources. It is not only to help the development of minority culture, but also to promote the sense of pride of ethnic minorities.

온톨로지에 기반한 지능형 e-learning 시스템

  • 최현종;김태영
    • Communications of the Korean Institute of Information Scientists and Engineers
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    • v.22 no.8
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    • pp.41-49
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    • 2004
  • 올해 우리나라의 인터넷 이용자 수가 3,000만 시대에 접어들었으며 수능 e-learning교육 시장이 2000억원 대 수준이 될 것이라는 한국전산원의 전망이 발표되었다 (1). 이런 수치적인 인터넷 시장 전망이 우리에게 의미하는 것은 무엇인가? 우리나라에서의 인터넷이라는 것은 소수 집단의 점유물이 아닌 일반인들에게 친숙하게 다가가 있는 생활의 한 매체가 되어 버린 것이다.

생활 속 레저 - 도심에서 즐기는 레저스포츠 한강으로 떠나자

  • Park, Sun-Mo
    • 건강소식
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    • v.38 no.7
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    • pp.22-23
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    • 2014
  • 최근 레저스포츠에 대한관심이 뜨겁다. '소수 마니아층만 즐기는 전유물'이란 이미지가 점차 '가족화'되고 있기 때문이다. 그런 의미에서 서울 시민은 운이 좋은 편이다. 서울 시민의 젖줄인 한강에서는 기족들이 함께 즐길 수 있는 여러 종류의 레저스포츠를 손쉽게 만나볼 수 있다.

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