이상설 : 한국 근대수학교육의 아버지

설한국,이상구,Seol, Han-Guk,Lee, Sang-Gu 한국수학사학회 2009 Journal for history of mathematics Vol.22 No.3

본 논문은 한국수학사에서 연구와 정리가 취약한 시기인 근대수학의 도입기를 조사하면서, 그 근대수학의 도입기에서 만나게 되는 인물인 이상설(李相卨)에 대한 조명을 시도한다. 시대적 상황이 모든 분야의 침체기를 가져온 구한말 이상설은 근대수학에서 당대를 대표하는 높은 학식을 쌓고 뛰어난 재능을 보여주었다. 그간 이상설에 대해 '근대수학교육의 아버지'라는 평가가 없지 않았음에도 불구하고 낯설게 느껴진다면, 그것은 그가 독립운동가로만 강하게 각인된 탓일 것이다. 하지만 그는 19세기말 조선 근대수학의 첫 번째 교과서 편저자이자 수학교사이기도 했음을 새겨둘 필요가 있다. 대유학자이면서도 선구적으로 외국어와 서양과학 특히 근대 서양수학을 이해한 면모는 한국이 배출한 천재 중 하나라는 평가가 결코 과장이 아님을 보여준다. 이에 본 논문에서는 한국 근대수학교육에 커다란 기여를 한 인물인 이상설의 교육과 학문 및 실천업적을 조명한다. 보재 이상설이 1886년경에 쓴 책 <수리>와 최초로 수학과 과학을 관립교육기관의 교육과정에 편성한 과정, 최초의 근대수학교과서로 여겨지는 <산술신서>의 발간, 민족교육기관인 '서전서숙'의 설립 및 운영을 포함한 보재의 업적을 한국수학사 관점에서 조명한다. 또한 <산술신서>의 목차와 구체적인 내용 및 1901년에 출간된 <신정산술>의 내용을 소개하고, 지금까지 부정확하게 알려진 <수리>와 <산술신서>에 관한 몇 가지 역사적 사실을 발굴하여 재조명한다. Most who have heard of Sang-Seol Lee know him for his contribution to the Korean independence movement nearly a hundred years ago. This paper, however, will discuss Lee's other great contribution to his country; that of being "The father of modern mathematical education in Korea". Lee passed the rigorous government officer examination with the highest honor and became a teacher for the royal prince. Later he became the president of Sunkyunkwan, a national institute of higher learning since 1398, and eventually a well-known university bearing the same name. Lee was also a highly regarded Confucian scholar and well versed in foreign languages. He wanted Korea to become a modern country and felt that the areas of science and engineering were studies that needed improving in order to achieve modernization. While researching Western textbooks on the subjects he realized that Western mathematics would be especially important for Korea. With that, it became his mission to integrate Western mathematics into the Korean educational system. This paper will explain the importance of Sang-Seol Lee's contributions to mathematic education in Korea and how it helped Korea become the modern nation it is today.

Chemical reactivity of oxide materials with uranium and uranium trichloride

Sung Ho Lee,Choon Ho Cho,Yoon Sang Lee,Han Soo Lee,Jeong-Guk Kim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6

A graphite crucible is used for the manufacturing of uranium ingots in the uranium casting equipment of the electrorefining process. Uranium and uranium alloys are typically induction melted in graphite crucibles under a vacuum condition; however, due to the chemical reactivity of uranium and most alloying elements with carbon, a protective ceramic coating is generally applied to the graphite crucibles. To investigate the most suitable ceramic coating material for application to graphite melting crucibles used for the melting uranium in uranium casting equipment, firstly,a thermodynamic analysis using HSC software was performed to examine the chemical reactivity of ceramic oxide materials with uranium and uranium trichloride, and also, experiments concerning the reactivity of molten uranium in some ceramic coated crucibles were performed at 1,300 oC. From the results, yttria was finally selected as the most suitable ceramic coating material for application to graphite crucibles for melting the uranium.

Serum MicroRNA Expression Profiling in Mice Infected with Rabies Virus

Han, Myung Guk,Park, Jun-Sun,Lee, Cho Soon,Jeong, Young Eui,Ryou, Jung Sang,Cho, Jung Eun,Ju, Young Ran,Lee, Kyoung-Ki Korea Centers for Disease Control and Prevention 2011 Osong Public Health and Research Persptectives Vol.2 No.3

<P><B>Objectives</B></P><P>Serum or plasma microRNAs (miRNAs) are potential biomarkers for the diagnosis for cancer and prenatal diseases. This study was conducted to investigate whether rabies virus causes a change in serum miRNA expression.</P><P><B>Methods</B></P><P>ICR mice were intramuscularly inoculated with rabies virus and were sacrificed weekly to collect serum and brain tissue for 4 weeks postinoculation. Mice were assigned to four groups based on the results of indirect immunofluorescent assays, enzyme-linked immunosorbent assay, and nested reverse transcription-polymerase chain reaction and the expression profiles of serum miRNAs were compared using a commercial mouse miRNA expression profiling assay.</P><P><B>Results</B></P><P>The expression levels of miRNAs changed significantly with the different stages of the disease. The expression level of 94 serum miRNAs in infected mice changed at least twofold. Seven microRNAs of them were significantly upregulated or downregulated in all infected mice regardless of disease status. The number of miRNAs with an expression level change decreased with the progression of the disease. In a hierarchical cluster analysis, infected mice clustered into a group separate from uninfected control mice.</P><P><B>Conclusions</B></P><P>Based on the relationship of miRNAs to gene expression regulation, miRNAs may be candidates for the study of viral pathogenesis and could have potential as biomarkers.</P>

Reentrant phase transition in a predator-prey model.

Han, Sung-Guk,Park, Su-Chan,Kim, Beom Jun Published by the American Physical Society through 2009 Physical review. E, Statistical, nonlinear, and so Vol.79 No.6

<P>We numerically investigate the six-species predator-prey game in complex networks as well as in d -dimensional regular hypercubic lattices with d=1,2,...,6 . The food-web topology of the six species contains two directed loops, each of which is composed of cyclically predating three species. As the mutation rate is lowered below the well-defined phase transition point, the Z2 symmetry related with the interchange in the two loops is spontaneously broken, and it has been known that the system develops the defensive alliance in which three cyclically predating species defend each other against the invasion of other species. In the Watts-Strogatz small-world network structure characterized by the rewiring probability alpha , the phase diagram shows the reentrant behavior as alpha is varied, indicating a twofold role of the shortcuts. In d -dimensional regular hypercubic lattices, the system also exhibits the reentrant phase transition as d is increased. We identify universality class of the phase transition and discuss the proper mean-field limit of the system.</P>

A Case of Cutaneous Sparganosis Masquerading as Cutaneous Larva Migrans

( Guk Jin Jeong ),( Hye Sung Han ),( Sung Jong Hong ),( Myeung Nam Kim ) 대한피부과학회 2019 大韓皮膚科學會誌 Vol.57 No.3

Characteristics of the Conditioned Medium Produced by CA-12 Lymph Node Stromal Cells

( SANG HAN LEE,DONG SUN LEE,YOUNG BAE SEU,JONG GUK KIM,TAKASHI TSURUO,SOON DUCK HONG ) 한국미생물생명공학회 1998 Journal of microbiology and biotechnology Vol.8 No.1

Thermostable Artificial Solid-Electrolyte Interface Layer Covalently Linked to Graphite for Lithium Ion Battery: Molecular Dynamics Simulations

Guk, Hyein,Kim, Daejin,Choi, Seung-Hoon,Chung, Dong Hyen,Han, Sang Soo The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.6

<P>The lithium ion batteries (LIBs) are the most widely used power source for portable electronic devices, and the performance of the LIBs needs to be improved for the electrical vehicles and mobile devices. The formation of the stable solid-electrolyte interface (SEI) layer is closely related to Columbic efficiency and long cycle life of battery so the stable SEI layer is essential to the performance of the LIBs. To suggest an artificial SEI layer model that improves the stability of the LIBs, we performed the molecular dynamics simulation using the reactive force field. The artificial SEI layer model (PEO-graphite) was generated from the reaction between the graphite edge plane functionalized with hydroxyl groups and ethylene oxides, thereby having PEO-like polymers covalently linked to the graphite edge plane. The solvation number of Li+ and thermal stability of the SEI layer were investigated to understand the characteristics of the PEO-graphite. The analysis results show that the PEO-graphite effectively prevents the co-intercalation of the solvents into the graphite, and the covalent bonds between PEO polymers and the graphite edge plane provide excellent thermal stability to the PEO-graphite compared to the graphite physically coated with the polymers. (C) 2016 The Electrochemical Society. All rights reserved.</P>

Association between household size, residential area, and osteoporosis: analysis of 2008 to 2011 Korea National Health and Nutrition Examination Survey

( Sung Woo Kim ),( Kwi Hyun Bae ),( Jung Beom Seo ),( Jae Han Jeon ),( Won Kee Lee ),( In Kyu Lee ),( Jung Guk Kim ),( Keun Gyu Park ) 대한내과학회 2016 The Korean Journal of Internal Medicine Vol.31 No.4

Background/Aims: The prevalence of single-person households has rapidly increased in Korea. Individuals living alone and in rural areas may have a higher risk of various metabolic diseases due to differences in lifestyle. However, few studies have investigated the association of household size and residential area with health-related problems. This study aimed to evaluate the association of household size and residential area with risk of osteoporosis in postmenopausal women. Methods: This cross-sectional study enrolled 3,058 postmenopausal women from the 2008 to 2011 Korea National Health and Nutrition Examination Survey (KNHANES). We examined the association between bone mineral density (BMD) and household size and residential area. Results: Individuals living in rural areas had significantly lower BMD of the lumbar spine than those living in an urban area. Subsequently, we divided the participants into four groups according to household size and residential areas. Lumbar spine BMD was significantly lower in individuals living in rural singleperson households than those in urban households with two or more individuals, even after adjustment for multiple confounding factors. In addition, individuals in rural single-person households had significantly greater odds of osteoporosis in the lumbar spine than those in urban households with two or more residents. Conclusions: Individuals in rural single-person households had significantly lower BMD and greater odds of osteoporosis in lumbar spine than urban households with two or more individuals. The results of this study suggest that individuals living in rural single-person households may benefit from more careful screening for osteoporosis.

On a sign-pattern matrix and it's related algorithms for L-matrix

Han-Guk Seol,Yu-Hyuk Kim,Sang-Gu Lee 한국산업응용수학회 1999 Journal of the Korean Society for Industrial and A Vol.3 No.1

Impact of urgently initiated tele-prescription due to COVID-19 on glycemic control in patients with type 2 diabetes

( Sung-don Park ),( Na-young Kim ),( Jae-han Jeon ),( Jung-guk Kim ),( In-kyu Lee ),( Keun-gyu Park ),( Yeon-kyung Choi ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.4

Background/Aims: Coronavirus disease 2019 (COVID-19) is a global pandemic that had affected more than 13,000 people in South Korea by July 2020. To prevent spread of COVID-19, tele-prescription was permitted temporarily. This study investigated the impact of tele-prescription on glycemic control in patients with type 2 diabetes. Methods: Glycated hemoglobin (HbA1c) concentrations were retrospectively analyzed in patients with type 2 diabetes who were treated with tele-prescription because of COVID-19 and those who were treated by face-to-face care (non-tele-prescription group) enrolled at the same period of time. Mean HbA1c concentrations and mean change in HbA1c concentration (ΔHbA1c) were compared in these two groups. Results: The mean HbA1c levels of patients were significantly higher after than before the tele-prescription period (7.46% ± 1.24% vs. 7.27% ± 1.13%, p < 0.05). Mean ΔHbA1c was significantly higher in the tele-prescription than in the non-tele-prescription group (0.19% ± 0.68% vs. 0.04% ± 0.95%, p < 0.05). HbA1c was significantly greater in patients taking fewer oral hypoglycemic agents, no insulin, fewer comorbidities (e.g., coronary artery disease, cerebrovascular accident, and diabetic neuropathy), and higher baseline HbA1c. Conclusions: Tele-prescription may worsen glycemic control in patients with type 2 diabetes during public health crises.