• Journal for History of Mathematics
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• v.18 no.2
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• pp.9-22
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• 2005

Natural numbers have not yet been studied adequately on the aspect of its historical development in spite of its mathematical and educational importance. This article studied the historical development of natural number concept, that is, its historical meaning in the mathematical development process and influence of cultural and social element in relation with way of understanding number. From these examinations, we identified some characteristics in the history of natural number concept.

• Journal for History of Mathematics
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• v.32 no.3
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• pp.109-134
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• 2019

In order to improve the educational situation in which the natural number e and the natural logarithm are dealt with somewhat perfunctorily, this study explores the genetic process in which the natural logarithm and its base e occurred, and has an educational discussion based on that analysed process. Specifically, the study inquires into how the natural logarithm happened in relation to the quadrature of the hyperbolic curves through analysis and thought experimentation in mathematics history. Particularly, it sheds light on the role of e and the naturalness of the natural logarithm in terms of the introduction of the real number exponent. Also, this study discusses what the findings suggest educationally.

• Journal of the Korean earth science society
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• v.31 no.6
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• pp.656-670
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• 2010

The purpose of this study was to provide a master plan for the establishment of a Korean National Museum of Natural History. The origin and development of the natural history and the natural history museum were surveyed by visiting not only Korean natural history museums but also foreign ones from 1987 to 2009. Based on the obtained information, the qualitative and quantitative status of Korean natural history museums was comparatively analyzed in terms of globalization. Results indicated that Korean natural history museums ranked more than 100th in the world, and the research, management, and publications were situated in a rudimentary stage. Particularly, the number of researchers within the area was too small, and the research environment was poor in its function and resources. In addition, the specialists on exhibition and education of the museums were too few to publish the research products and academic journal articles. For that matter, a strategy as the research-specimen management-publication-exhibition-education functions should be in place to operate before the construction of National Museum of Natural History begins.

• Journal of the Korean earth science society
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• v.36 no.7
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• pp.674-681
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• 2015

The study was designed to analyze the curatorial professional resources of natural history museums in Korea and propose a plan on how to develop human resources including younger generation of experts to be working on the future National Museum of Natural History. Many academic associations and expert groups in the field have been making multilateral efforts along with research-based studies about how to best establish a National Museum of Natural History in the past 20 years. The Korean Earth Science Society was a premier organization which has been working closely on the establishment of natural history museums and science museums through a number of academic studies and projects more than any other academic associations. This study recommends that the future National Museum of Natural History needs highly-trained specialists of museums. Therefore, the Korean Earth Science Society has to offer multiple courses that produce specialists in various fields of museums through education and training.

• Journal for History of Mathematics
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• v.27 no.3
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• pp.183-195
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• 2014

In mathematics a prime number is the natural number that has no positive factors other than 1 and itself. As natural numbers greater than 1 can be factored characterized by prime numbers, identities of a culture could be understood if its cultural phenomena are analyzed through cultural prime numbers(CPN). It is not easy to resolve cultural phenomena into CPN and analyze them through CPN due to complexities of culture. Though it is difficult, however, it is not impossible. For CPN keeps relative independence in the context of history and thought. We call 2, 3 and 5 as CPN: 2 is representative of Yin and Yang theory, 3 of Three Principles theory, and 5 of Five Elements theory. We argue that the Ten Celestial Stems and the Twelve Earthly Branches, the core principles in the oriental tradition, could be factored by the CPN. Analyzing Sil-Hah Woo's arguments, we discuss that the CNP 3 achieved more qualitative valuation than the others in Korean culture.

• The Mathematical Education
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• v.50 no.2
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• pp.135-148
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• 2011

We can say that the history of mathematics is the history on the development of the number system. The number starts from Natural number and is constructed to Integer number and Rational number. The Rational number is not the complete number analytically so that Real number is completed by the idea of the nested interval method. Real number is completed analytically, however, is not by algebra, so the algebraically completed type of the rational number, through the way that similar to the process of completing real number, is Complex number. The purpose of this study is to show the most appropriate way for the development of the human being thinking about the teaching and leaning of Complex number. To do this, We have to consider the proof of the existence of Complex number, the background of the introduction of Complex number and the background knowledge that the teachers to teach Complex number should have. Also, this study analyzes the knowledge to be taught of Complex number based on the anthropological theory of didactics and finally presents the teaching method of Complex number based on this theory.

• Journal for History of Mathematics
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• v.11 no.2
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• pp.1-7
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• 1998

Lee, Sang-Hyuk(1810-\ulcorner) said that Cha-Geun-Bang means algebra come from the West. In the chapter 'Che-Lyu' of the second volume of his book Cha-Geun-Bang-Mong-Gu, he gave the list of questions which could be expressed by the equation of one variable and explained the solution for them. All questions were formulated by equations of degree 2, 3, 4 which have terms on both sides of equal sign and they mostly have natural number solutions. The explanation of each question describes the procedure to make the equation in detail, but only presents the solution with few step to solve.

• Korean journal of applied entomology
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• v.42 no.2
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• pp.169-171
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• 2003

The life history and natural enemies of Coleophora obducia Meyrick which is a defoliating pest of Larix leptolepis were studied mainly in Chungchongbuk Province. Larix leptoiepis was the only host plant of this pest. Coleophora obducia had one generation per you and the adults emerged from mid May to late May with a peak emergence around May 14th. The mean number of eggs in an ovary was 44.5 and most females oviposited one egg on each needle. The duration of the egg stage was about two weeks. Larvae passed the winter in a pouch made by spinning the needles. Pupation began in the late April, and the pupal period was two weeks on average. The natural enemies observed were parasitoids and predators.

• Journal of the Korean earth science society
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• v.39 no.1
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• pp.67-88
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• 2018

The important PH (paleontological heritages) with scientific, educational and esthetic values designated as natural monuments and protected by legislations of South and North Koreas are herein compared for the first time. On the basis of data (Jan. 2017) provided by the Cultural Heritage Administration of (South) Korea, a total of 457 natural monuments was designated. Of these, geological heritages are 80 in number, which includes 24 (30%) PH. Data (Dec. 2005) of North Korea show that a total of 474 natural monuments was designated. Among these, geological and geographical ones are 154 in number, which includes 22 (14%) PH. Differences between PH of South and North Koreas are regarded to be directly related with geological difference in distribution of the fossil-bearing strata between South and North Koreas. PH of Silurian corals, Devonian plants, Jurassic fishes, Cretaceous dinosaur tracks, birds (so called Korean Archaeopteryx) and pterosaurs, and Pleistocene paleoanthropological fossils appear to be scientifically significant. Together with these North Korean PH, scientific, esthetic, conservational, educational, and economical values of important PH including KCDC (Korean Cretaceous Dinosaur Coast), Jigunsan Shale, and Geumgwangdong Shale of South Korea should be evaluated as potential future candidates for international heritages.

• Journal of the Korean earth science society
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• v.36 no.3
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• pp.236-245
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• 2015

This study investigated the errors in presenting paleontology exhibition data in 9 natural history museums for 2 years and two months from 15, Aug. 2013 to 25, March 2015. It was found that seven natural history museums presented 28 difference cases of data in error. The purpose of this study was to investigate why the errors occurred and how to prevent the errors from occurring and finally how to correct the errors earlier. For this purpose, this study review related literatures using conference proceedings, books, conducted a survey via natural history museums. Results suggested five ways to correct errors in the future. First, it is suggested that the authorities of the museum increase the number of curators and have specialists participate in excavation and maintenance, research, preparation of the exhibition data through a collaboration with universities and research institutes. Second, it is also suggested that the authorities establish the classification system to use in the exhibition process and secure a job for their maintenance specialists. Third, the authorities of museum should put an examination process in place as a system by inviting the external experts into the exhibition process and also establish a process of collecting errors identified by any museum visitors. Fourth, the authorities of museum should make an efforts to increase the participating rate of correcting errors through SNS, Docent, and educational programs among the community members and students. Fifth, they also should use mass media to show and present the research-proven figures of paleontological fossils, which hopefully helps resolve issues of the prior unchanging cultural inertia.