• Title/Summary/Keyword: 수리(數理)

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P.A.S 자체수리로 수리비 절감

  • Lee, Byeong-Jae
    • 월간산업보건
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    • s.191
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    • pp.60-63
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    • 2004
  • 직원들의 창의성과 적극적 참여의식을 유도하고 조직 내에서 유연한 개선활동을 전개해 나가기 위해 도입한 2003년 제안활동에서 최우수 제안으로 채택된 제안 전문을 싣는다. 비용의 숫자는 협회 내부방침으로 표기하지 않기로 하였으나 양해해 주시기 바란다.

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POLICY & ISSUES 환경칼럼 - 자연이 주는 신호에 귀를 기울여라!

  • Jeong, Hoe-Seok
    • Bulletin of Korea Environmental Preservation Association
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    • s.406
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    • pp.2-4
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    • 2013
  • 인류가 언제부터 수(數: 사물을 세어서 나타낸 값)와 수치(數値: 수를 연산하여 얻은 값) 개념을 이해하고 사용했을까? 정확히 알 수는 없지만 개인들이 재산을 소유하게 되면서 가축이나 그 밖의 물품에 대해 기록하고 파악할 필요가 생긴 이후부터라고 추측된다. 이후 이것은 수리(數理: 수에 대한 이치)로 까지 발전하여 천문학, 통계학, 건축학, 물리학 등 다양한 학문의 기초가 되었으며 인류문영이 일진하는데 토대가 되었다.

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Lee Sang Seol's mathematics book Su Ri (이상설(李相卨)의 산서 수리(算書 數理))

  • Lee, Sang-Gu;Hong, Sung-Sa;Hong, Young-Hee
    • Journal for History of Mathematics
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    • v.22 no.4
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    • pp.1-14
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    • 2009
  • Since western mathematics and astronomy had been introduced in Chosun dynasty in the 17th century, most of Chosun mathematicians studied Shu li jing yun(數理精蘊) for the western mathematics. In the last two decades of the 19th century, Chosun scholars have studied them which were introduced by Japanese text books and western missionaries. The former dealt mostly with elementary arithmetic and the latter established schools and taught mathematics. Lee Sang Seol(1870~1917) is well known in Korea as a Confucian scholar, government official, educator and foremost Korean independence movement activist in the 20th century. He was very eager to acquire western civilizations and studied them with the minister H. B. Hulbert(1863~1949). He wrote a mathematics book Su Ri(數理, 1898-1899) which has two parts. The first one deals with the linear part(線部) and geometry in Shu li jing yun and the second part with algebra. Using Su Ri, we investigate the process of transmission of western mathematics into Chosun in the century and show that Lee Sang Seol built a firm foundation for the study of algebra in Chosun.

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A Repair-Time Limit Replacement Model with Imperfect Repair (불완전 수리에서의 수리시간한계를 가진 교체모형)

  • Chung, Il Han;Yun, Won Young
    • Journal of Korean Institute of Industrial Engineers
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    • v.39 no.4
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    • pp.233-238
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    • 2013
  • This article concerns a profit model in a repair limit replacement problem with imperfect repair. If a system fails, we should decide whether we repair the failed system (repair option) or replace it by new one (replacement option with a lead time). We assume that repair times are random variables and can be estimated before repair with estimation error. If the estimated repair time is less than the specified limit (repair time limit), the failed unit is repaired but the unit after repair is different from the new one (imperfect repair). Otherwise, we order a new unit to replace the failed unit. The long run average profit (expected profit rate) is used as an optimization criterion and the optimal repair time limit maximizes the expected profit rate. Some special cases are derived.

Study on Value Appraisal after the Repair of Cars (자동차의 수리후 가치평가방법에 대한 연구)

  • Yun, Daekwon;Lee, Haeteak;Nam, Ilwoo;Lee, Heongyu;Kim, Yonghyeon;Yun, Jaegon;Kim, Juyeong;Ha, Seongyong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.3
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    • pp.19-24
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    • 2014
  • This study, the exchange value of the car after the repair, which affects the valuation elements and repair characteristics factors were investigated. Based on this specific accident damaged condition of the car, repair range, repair methods, repair costs, market transactions, taking into account the vehicle's depreciation appraisal method is proposed.

Botany: A Modern Natural Science Book written by Mathematician Sang-Seol Lee (수학자 이상설이 소개한 근대자연과학: <식물학(植物學)>)

  • Park, Young-Min;Kim, Chae-Sik;Lee, Sang-Gu;Lee, Jae-Hwa
    • Communications of Mathematical Education
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    • v.25 no.2
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    • pp.341-360
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    • 2011
  • This paper deals with contents that Sang-Seol Lee contributed to the natural science in the 19th century Korea. Prof. Sung-Rae Park, the science historian, called Sang-Seol Lee Father of the Modern Mathematics education of Korea. Sang-Seol Lee wrote a manuscript Botany with a brush in late 19th century. Botany was transcribed from Science Primers: Botany (written by J. D. Hooker), which is translated into Chinese by Joseph Edkins in 1886. The existence of Sang-Seol Lee's book Botany was not known to Korean scientists before. In this paper, we study the contents of Botany and its original text. Also we analyze people's level of understanding Western sciences, especially botany at that time. In addition, we study authors of 16 Primers jar Western Knowledge. We study the contribution of mathematician Sang-Seol Lee to science education in the 19th century Korea.

19th Century Chemistry Book of Korean Mathematician Sang-Seol LEE (한국 근대수학교육의 아버지 이상설(李相卨)이 쓴 19세기 근대화학 강의록 『화학계몽초(化學啓蒙抄)』)

  • Son, Yongkeun;Kim, Chae Sik;Lee, Sang-Gu;Lee, Jae Hwa
    • Korean Journal of Mathematics
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    • v.20 no.4
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    • pp.541-563
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    • 2012
  • Sang-Seol LEE wrote a manuscript HwaHakGyeMongCho(化學啓蒙抄) in the late 19th century. HwaHakGyeMongCho was transcribed from Science Primers: Chemistry (written by H. E. Roscoe), which is translated into Chinese by Joseph Edkins in 1886. LEE did not copy original writing exactly, but he understood the contents of each chapter and sections, then summarized and edited them in his caligraphic writing. In this paper, we introduce the contents for the first time and discuss the significance of this book.

Sang-Seol Lee's manuscript on modern physics in the late 19th century Korea (수학자 보재 이상설(李相卨)의 근대자연과학 수용 - 『백승호초(百勝胡艸)』를 중심으로)

  • Lee, Sang-Gu;Park, Chong-Yun;Kim, Chae Sik;Lee, Jae Hwa
    • Communications of Mathematical Education
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    • v.27 no.4
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    • pp.487-498
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    • 2013
  • Sang-Seol Lee(1870-1917) wrote a manuscript BaekSeungHoCho(百勝胡艸) in the late 19th century. BaekSeungHoCho was transcribed in classical Chinese from the 1879 Japanese book Physics(物理學) by Teizo Ihimori (1851-1916). Sang-Seol Lee, a famous independence activist, is also called Father of the Modern Mathematics Education of Korea, because of his early contribution to the modern mathematics education in the 19th century. In this paper, we introduce contents of his manuscript BaekSeungHoCho for the first time and discuss the significance of this book. Also, we show his contribution on the introduction to modern physics in the late 19th century Korea.

Synthetic Conception of Ten Heavenly Stems and Twelve Earthly Branches According to Mathematical Principle (수리(數理)를 통해 살펴본 십간(十干)과 십이지(十二支)의 종합적 개념)

  • Han, Gook;Yun, Chang-Yeol
    • Journal of Korean Medical classics
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    • v.33 no.1
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    • pp.29-50
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    • 2020
  • Objectives : Objectiveness and accuracy of numbers could allow for a new way of understanding the principle of Ten Heavenly Stems(THS) and Twelve Earthly Branches(TEB) when applied. Methods : The order of the THS and TEB, the Five phases of direction and change, conversion of other, conversion of self of the Stems and Branches were examined through numbers. Results & Conclusions : The numerical combination of the Stems and Branches depends on the identification of the Three Points. Conversion of self of the Heavenly Stems are as follows: for 甲 3+5=8, for 乙 8+4=12, for 丙 7+1=8, for 丁 2+8=10, for 戊 5+7=12, for 己 10+10=20, for 庚 9+9=18, for 辛 4+6=10, for 壬 1+3=4, for 癸 6+2=8. Conversion of self of the Earthly Branches are as follows: for 子 1+2=3, for 丑 5+5=10, for 寅 3+2=5, for 卯 8+4=12, for 辰 5+1=6, for 巳 2+8=10, for 午 7+7=14, for 未 10+10=20, for 申 9+7=16, for 酉 4+9=13, for 戌 5+6=11, for 亥 6+3=9. Here the Stems and Branches could be understood intensively. Among the Stems and Branches, the Great Points are 壬, 癸, 戌, 亥, 子, Emperor Points are 甲, 戊, 丑, 午, and Empty Points are 己, 未.

The study of fractural behavior of repaired composite (수리된 복합 레진 수복물의 파괴 거동에 관한 연구)

  • Park, Sang-Soon;Nam, Wook;Eom, Ah-Hyang;Kim, Duck-Su;Choi, Gi-Woon;Choi, Kyoung-Kyu
    • Restorative Dentistry and Endodontics
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    • v.35 no.6
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    • pp.461-472
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    • 2010
  • Objectives: This study evaluated microtensile bond strength (${\mu}TBS$) and short-rod fracture toughness to explain fractural behavior of repaired composite restorations according to different surface treatments. Materials and Methods: Thirty composite blocks for ${\mu}TBS$ test and sixty short-rod specimens for fracture toughness test were fabricated and were allocated to 3 groups according to the combination of surface treatment (none-treated, sand blasting, bur roughening). Each group was repaired immediately and 2 weeks later. Twenty-four hours later from repair, ${\mu}TBS$ and fracture toughness test were conducted. Mean values analyzed with two-way ANOVA / Tukey's B test ($\alpha$= 0.05) and correlation analysis was done between ${\mu}TBS$ and fracture toughness. FE-SEM was employed on fractured surface to examine the crack propagation. Results: The fresh composite resin showed higher ${\mu}TBS$ than the aged composite resin (p < 0.001). Mechanically treated groups showed higher bond strength than non-mechanically treated groups except none-treated fresh group in ${\mu}TBS$ (p < 0.05). The fracture toughness value of mechanically treated surface was higher than that of non-mechanically treated surface (p < 0.05). There was no correlation between fracture toughness and microtensile bond strength values. Specimens having high KIC showed toughening mechanism including crack deviation, microcracks and crack bridging in FE-SEM. Conclusions: Surface treatment by mechanical interlock is more important for effective composite repair, and the fracture toughness test could be used as an appropriate tool to examine the fractural behavior of the repaired composite with microtensile bond strength.