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Korean Federation of Science and Technology Societies
- The Science & Technology
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- v.9 no.7 s.86
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- pp.41-45
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- 1976
죽산술은 붓이나 연필 등으로 셈하는 산필이 아니라 산기로써 하는 셈법이다. 우리나라에 지금까지 알려진 옛셈법은 산목셈이나 서산을 이용한 셈이 있었다. 그중 산목셈에 관한 문헌은 1653년 청주도에 표류한 화란인 "하멜"의 기록이나 한말 일인의 기록에 나타난다. 그러나 산목셈의 한 유형로 보이는 죽산술에 대해서는 산가치(죽기)로 셈하는 방법이 있었다는 사실만 알려져 있을뿐 그 산법은 전혀 파악하지 못하고 있었다. 이렇게 전혀 파악되지 못햇던 우리나라 고유죽산술이 김선종씨(46세)에 의해서 발표되었다.
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Her Min
- Journal for History of Mathematics
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- v.18 no.1
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- pp.49-66
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- 2005
We briefly survey the history of abacus and counting rods which had been most widespread devices for arithmetical calculations. And we explain and compare the methods and principles of calculation on the abacus and counting rods. Only multiplication and division are presented here with examples. In these course we can see that the principles of calculation on the abacus are inherited from that of calculation on the counting rods. We also discuss the educational value of the abacus.
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Park, Mangoo;Kim, Eunhye;Whang, Sungwhan;Lee, Donghee
- Journal of Elementary Mathematics Education in Korea
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- v.17 no.2
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- pp.225-243
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- 2013
This study was to analyze the effects of basic computational abilities using G-learning contents, which was developed for mathematically slow learners. The participant students were 146 mathematically slow learners in grade 3-6 in Seoul. The researchers analyzed the difference between pre and post test scores to check their effectiveness. Also, teachers and parents as well as students responded survey items to check dispositions and satisfactions towards the program. The research results showed that the application of the G-learning contents on basic computation areas was effective to develop students' basic computational skills. In addition, students also showed that they were satisfied studying basic computations with the G-learning contents. They had increased beliefs about and decreased difficulties in mathematics. Parents and teachers also had satisfactions in using the G-learning programs in spite of some negative effects such as errors in the contents, use of computers, and concentration on the game itself. For the improvement of G-learning contents, we need to keep studying on G-learning contents with wide range of areas and long term studies.
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Kim, Myeongseok
- Korean Journal of Logic
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- v.22 no.1
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- pp.1-23
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- 2019
Gott, Carter, Leslie, Bostrom and so on, as Descartes did, have made the evidence that is "I am here as an observer" to support many other beliefs. Bostrom and others who studied observation selection effects are missing two points. First, the self-consciousness information of the ones who just came up is distinct from that of the ones who have awoken. The awoken 'I' can trace back by memory to the past, but the 'I' who just came up can not. Second, when calculating credence, we must distinguish the ones in the possible worlds from the ones in the actual worlds. An estimate of credence where only one possible world is actualized among all possible worlds, differs fundamentally from that where all possible worlds are actualized. Keeping these two points in mind, we have explored what is the nature of the self-consciousness information of the one who just came up. We examine in depth the two human embryos thought experiment.
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