• East Asian mathematical journal
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• 제30권4호
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• pp.475-491
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• 2014

We can easily see the 'cycloid slide' in the many mathematics and science museums. The educational materials, however, do not give us any mathematical principle. For this reason, we, in this thesis, first study the brachistochrone problem in the history of mathematics, and suggest a method of how to teach the principle using 'the dynamic geometry software GSP5' in order to help students understand the idea that the cycloid is the brachistochrone. Secondly, we examine the origin of the calculus of variations and apply it to prove the brachistochrone problem in order to build up the teachers' background knowledge. This allows us to increase the worth of history of mathematics and recognize how useful the learning is which uses technological tools or materials, and we can expect that the learning which makes use of cycloid slide will be meaningful.

• Plant Biotechnology Reports
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• 제3권1호
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• pp.1-56
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• 2009

Orchid seeds are nearly microscopic in size. Because of that, many fanciful theories were proposed for the origin of orchids. Almost 400 years separate the time when orchid seeds were seen for the first time and the development of a practical asymbiotic method for their germination. The seeds were first observed and drawn during the sixteenth century. Seedlings were first described and illustrated in 1804. The association between orchid and fungi was observed as early as 1824, while the requirement for mycorrhiza for seed germination was established in 1899. An asymbiotic method for orchid seed germination was developed in 1921. After Knudson's media B and C were formulated, orchids growing and hybridization became widespread. Hybrids which early growers may not have even imagined became possible.

• Journal of Korean Neurosurgical Society
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• 제44권6호
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• pp.405-408
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• 2008

GBM is the most common primary brain tumor, but intraventricular GBM is rare and only few cases have been reported in the literature. The authors report a case of 64-year-old man who had a remote history of previous periventricular intracerebral hemorrhage. Brain computed tomography (CT) and magnetic resonance (MR) imaging showed an intraventricular lesion with inhomogeneous enhancement, infiltrative borders and necrotic cyst, and obstructive hydrocephalus. The patient underwent surgical removal through transcortical route via the bottom of previous hemorrhage site and the final pathologic diagnosis was GBM. We present a rare case of an intraventricular GBM with detailed clinical course, radiological findings, and pathological findings, and the possible origin of this lesion is discussed.

• 한국철학논집
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• 제52호
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• pp.157-183
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• 2017

근대는 서구 문명이 보편으로 자리잡은 시기였지만, 유학적 자산에 대한 근대적 성찰은 한국적 근대, 주체적 주체를 물을 수 있는 토대가 되었다. 박은식은 양명학적 사상 전환과 진아론을 통해 근대적 맥락에서 유학문명을 재건하였다. 특히 진아론은 주체의 역사성을 강조했던 신채호의 '아(我)'와 함께 이성적 주체란 보편타자에 매몰되지 않은 한국 근대 주체를 정립했다는 측면에서 매우 중요한 철학적 진전이었다. 타자화된 주체성으로는 보편타자의 폭력성을 넘어서 제국주의침략을 극복하고 새로운 삶을 전망할 수 없었기 때문이다. 자강기에는 서구 근대문명 수용이 불가피하다고 인식되었고 박은식 역시 신학(新學) 및 그 정수인 물질학(物質學[과학(科學)])의 필요성을 인정하였다. 그러나 박은식은 신학 수용이 곧 유학의 전면적 부정으로 귀결되어서는 안 된다고 보았다. 그는 유학을 기존의 성리학적 메커니즘에서 벗어나, 양지(良知)를 사상적 기축으로 근대사회에서 유학본지를 구현하고자 하였다. 그는 유학이 평등시대를 구현해야 한다고 전제하고, 유학이념을 실현할 주체로서 민중 혹은 무문자(無文者)를 제시하였다. 무문자는 성리학적 구습에 얽매이지 않고 양지를 그대로 발현할 수 있다는 점에서 진아(眞我)이기도 하였다. 진아는 개인적 영욕화복을 계교하지 않고 시비판단과 실천을 능동적으로 할 수 있는 근대주체였으며, 한국 독립은 물론 세계 평화를 구현할 주축이기도 하였다. 지금 우리는 탈식민주의적 관점에서 전근대 및 근대적 유산을 새롭게 성찰할 필요가 있는데, 박은식의 진아론을 통해 이 두 가지 문제에 대한 실마리를 얻을 수 있다. 진아는 서구적 보편성에 대응할 유학적 보편성[인(仁), 양지(良知)]과 함께 민족적 주체성[자가정신(自家精神)] 및 문화적 정체성[국혼(國魂)]을 담지한 근대적 주체였다. 그러나 진아는 이성적 주체와 달리 타자에 대한 배제와 차별의 원리는 아니었다는 점에서 근대적 경계를 향유하면서도 근대 너머를 지향했다고 하겠다. 또 하나는 유럽중심주의적 근대 인식의 '밖'을 사유하는 전략 중의 하나로써 유학적 자산을 재음미하는 것이다. 특히 박은식이 유학을 민중 중심의 평등시대 평화이념으로 체계화한 것은 시사하는 바가 크다.

• 한국수학사학회지
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• 제33권3호
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• pp.167-177
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• 2020

Cooperative behavior may seem contrary to the notion of natural selection and adaptation, but is widely observed in nature, from the genetic level to the organism. The origin and persistence of cooperative behavior has long been a mystery to scientists studying evolution and ecology. One of the important research topics in the field of evolutionary ecology and behavioral ecology is to find out why cooperation is maintained over time. In this paper we take a historical overview of mathematical models representing cooperative relationships from the perspective of mathematical biology, which studies population dynamics between interacting biological groups, and analyze the mathematical characteristics and meanings of these cooperative models.

• Acta Via Serica
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• 제5권1호
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• pp.57-86
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• 2020

This article is an analysis of the tale Munhŭi who bought a dream which has been reported, with few variants, both in Samguk sagi and Samguk yusa. As the tale narrates a very particular and old dream, in which a urine flood forecasts kingship and royalty, it has not been investigated here on the basis of a modern psycho-analytical approach, but within eastern and western ancient cultural patterns regarding humans' consideration for excreta and criteria of dreams interpretation. The research led the author to propose for Munhŭi's dream an archaic (and today lost) archetype of interpretation, whose origin is perhaps to be found in the Ancient Middle-East.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제34권1호
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• pp.57-58
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• 2023

Through accurate observation and the results of experimental studies using great apes, the author tells us exactly what we have not known about human communication. The author persuasively conveys to the reader the grand history of developing from great apes' gestures to human gestures, to human speech. Given that great apes and human gestures were the origin of human voice language, we have once again realized that our language is, after all, an "embodied language."

• 한국의사학회지
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• 제18권1호
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• pp.49-63
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• 2005

Man-Byeong-Hoi-Chun(萬病回春) is the principal book of Gong Tingxian who was a physician in the time of Ming(明) dynasty. It has been widely used in Korea and Japan. We recently analyzed the case reports in the book and found that he made some prescriptions by day and night separately. The method was based on the Jo-Seok-Bo-Beop(朝夕補法) by 薛己. We thought that it was an important key to his ideas in medicine. So we reviewed the origin and the basic principles of Jo-Seok-Bo-Beop and considered the clinical usages.

• 복식
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• 제58권4호
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• pp.155-170
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• 2008

Club culture is the global trend for youth in 21st century. Club is the space that is created with close relationship among music, dance and fashion. It is also experimental cultural art space with endlessly transforming style. Furthermore it is a space for independent minor culture which represents speciality than generality of cultural appetite and style of club. Cultural communities formed around club and their parties have placed as a strong subculture trend based on youth age group. What they are creating as a subculture could be our tomorrow's main trend and clubbers also could be our major power sources for future. Therefore it is necessary to pay attention to club culture. The purposes of this research are to identify the concept of clubber, to analyzes their basic club culture characteristics and elements, and to find out unique fashion styles of Korean clubber in comparison with the origin. To study club fashion style's origin and background, this study searched a theoretical flow from 1930's to 1990's. Then, Korean clubber's style is derived by comparing background and origin of Korean club culture with those of abroad. To analyze in various point of view, theoretical backgrounds about social, cultural, dresses, and design were considered. Since research target is a visual image, street fashion is analyzed on through, music channels and magazines from 1930's to present as well as designer's art photographies. Internet sites', cub culture association's and sound association's photos were also extracted. as a visual evidences to offer actual evidences. Geological targets are selected among Korean club culture's origin such as Hong-Ik University area, Shin-chon, Chungdam-dong and Apgujung-dong areas. The results of this study are as follows. Firstly, clubber's fashion style influenced magnificently on major fashion design instead of being just youngster's resistance toward control group and it is contributing to our fashion culture to enrich it. Secondly, fashion styles of korean clubbers are based on those of western sub-culture, but with a unique localized history.

• Journal of Chest Surgery
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• 제18권3호
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• pp.513-516
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• 1985

Hemangiopericytoma is a rare tumor of vascular origin, first described by Stout and Murray in 1942. It is characterized by proliferation of capillaries surrounded by pericytes. There is no characteristic clinical or radiological finding. Wide excision is the treatment of choice. A 21 year-old man was admitted with one year history of productive cough. On admission, chest film showed large lobulated mass and Right lower lobe atelectasis. Rt. pneumonectomy was performed and the tumor was confirmed as malignant hemangiopericytoma of the lung. Local recurrence didn`t occur until now.