• 중국문학
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• 제95권
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• pp.99-125
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• 2018

이 논문은 레기스 신부가 《역경(易經)》을 어떤 시각으로 읽었고, 어떤 방식으로 구체적으로 번역하고 주석했는지를 분석하는 글이다. 레기스 신부는 색은주의(索隱主義) 시각으로 《역경》을 읽었다. 주석과 관련해서, 신부는 때로는 자연학, 때로는 정치학, 때로는 신학의 관점으로 《역경》의 주석을 시도했다. 이는 서양 독자들의 이해를 돕기 위해서였다. 이를 위해 서양 개념을 이용해서 동양 사상을 해명했는데, 이와 같은 시도는 절충주의적인 봉합으로 보일 수도 있 다. 하지만 이 절충주의적인 특징이 라틴어 《역경》의 학술적인 가치를 높여준다.

• 논리연구
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• 제5권1호
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• pp.147-157
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• 2001

In this study I try to show some numerical analogy between Leibniz's binary system anc I-ching's symbolic system of duo rerum principia, imagines quator, octo figurae am 64 hexagrams. But, there is really a formal logical accordance in their symbolic foundations, on which are based especially the Wittgenstein's 16 truth-tables in his Tractatus-logico-philosophicus(5.101) am 16 hexagrams, as long as we interpret with the binary values 0 am 1, i.e. the Bi-Polarity, the logical tradition from J. Boole, G. Frege through B. Russell and AN. Whitehead to R. Wittgenstein. So, I argue that the historical and theoretical root of that tradition goes back to the debate between Bouvet and Leibniz about the mathematical structure of I-ching' symbols and the Leibnizian binary arithmetic. In the letter on 4. 11. 1701 from Peking to Leibniz, Bouvet wrote that the I-Ching's symbolism has an analogous structure with Leibniz's binary arithmetic. Corresponding to his suggestion, but without exact knowledge, in the letter of 2. January 1967 to the duke August in Braunschweig-Lueneburg-Wolfenbuettel had Leibniz shown already an original idea for the creation of the world with imago Dei which comes from binary progression, dark and light on water.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제44회 KOSCO SYMPOSIUM 초록집
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• pp.259-261
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• 2012

The effect of fuel composition and coaxial air on the nitrogen oxide emission index was studied in a non-premixed turbulent jet flame. Validity of experimental setup and methodology is checked. The NOx emission trend is similar with previous works in hydrogen flame, but it's not well in $H_2/CO$ flame. Normalized EINOx scaling with modified $S_G$ applying near-field concept was conducted. Experimental data don't collapse single correlation curve, but partially same trend is observed in all cases.

• 한국연소학회지
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• 제17권1호
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• pp.22-29
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• 2012

The detachment stability characteristics of syngas $H_2$/CO jet attached flames were studied. The flame stability was observed while varying the syngas fuel composition, coaxial nozzle diameter and fuel nozzle rim thickness. The detachment stability limit of the syngas single jet flame was found to decrease with increasing mole fraction of carbon monoxide in the fuel. In hydrogen jet flames with coaxial air, the flame detachment stability was found to be independent of the coaxial nozzle diameter. However, velocities of appearance of liftoff and blowout velocities of lifted flames have dependence. At lower fuel velocity range, the critical coaxial air velocity leading to flame detachment increases with increasing fuel jet velocity, whereas at higher fuel velocity range, it decreases. This increasing-decreasing non-monotonic trend appears for all $H_2$/CO syngas compositions (50/50~100/0% $H_2$/CO). To qualitatively understand the flame behavior near the nozzle rim, $OH^*$ chemiluminescence imaging was performed near the detachment limit conditions. For all fuel compositions, local extinction on the rim is observed at lower fuel velocities(increasing stability region), while local flame extinction downstream of the rim is observed at higher fuel velocities(decreasing stability region). Maximum values of the non-monotonic trends appear to be identical when the fuel jet velocity is normalized by the critical fuel velocity obtained in the single jet cases.

• International Journal of Aeronautical and Space Sciences
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• 제12권3호
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• pp.296-304
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• 2011

In order to design a shear coaxial injector of solid particles with water, basic experiments on a particle laden jet are necessary. The purpose of the present study is to understand the effect of particle loading ratio on the particle spray characteristics (i.e. spreading angle, distribution of particle number density, velocity profiles, and particle developing region length). Hydro-reactive Al2O3 particles with a primary particle diameter of 35~50 ${\mu}m$ are used in this experiment. An automated particle feeder was designed to supply constant particle mass flowrates. Air is used as the carrier gas. To determine the air velocity at the orifice exit, tracers (aluminum oxide, 0.5~2 ${\mu}m$ primary diameter) are also supplied by a tracer feeder. A plain orifice type injector with 3 mm diameter, and 20 mm length was adopted. Particle image velocimetry is used to measure the mean and fluctuating velocity components along the axial and radial directions.

• 한국연소학회지
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• 제17권4호
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• pp.30-37
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• 2012

The flame lengths and NOx emission characteristics of syngas $H_2$/CO turbulent non-premixed jet flames were investigated. The flame length which is the main parameter governs NOx emission was studied for various syngas compositions. The flame length was compared with previous correlation between Froude number and flame height and it shows that they have good agreements. It was confirmed that the turbulent jet flames herein investigated are in the region of buoyancy-momentum transition. NOx emission was reduced with increased Reynolds number and CO contents in syngas fuel and with decreased fuel nozzle diameter which is attributed by decreased flame residence time. Previous EINOx scaling based on flame residence time of $L_f^3/(d_f^2U_f)$ satisfies only the jet flame in momentum-dominated region, not buoyancy-momentum transition region. The simplified flame residence time ($L_f/U_f$) was adopted in modified EINOx scaling. The modified scaling satisfies the jet flames not only in momentum-dominated region but in buoyancy-momentum transition region. The scaling is also satisfied with $H_2$/CO syngas jet flames.

• 인삼문화
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• 제1권
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• pp.28-42
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• 2019

위대한 철학자이자 미적분을 발견한 수학자로 잘 알려진 라이프니츠(Gottfried Wilhelm Leibniz, 1646~1716)가 인삼에 대해 물었다는 사실은 거의 알려져 있지 않다. 유럽의 계몽주의를 열었던 라이프니츠는 왜 인삼에 관심을 가지게 되었을까? 이 글은 라이프니츠가 남긴 방대한 기록 속에서 인삼을 찾아내고, 개인적 생애와 당대의 지적 흐름을 엮어 그가 인삼에 관심을 갖게 된 경로를 추적한 작업이다. 16세기부터 유럽에서는 약물지와 같은 고대 그리스 텍스트의 재발견과 해외에서 들여온 새로운 식물들로 인해 본초학이 크게 발달하게 되었다. 같은 맥락에서 '구대륙' 중국에서 만병통치약으로 이름을 떨치던 인삼 또한 여행기 등을 통해 유럽에 소개되기 시작했다. 중상주의 기치 하에 유용한 약용식물에 대한 관심이 커 가던 유럽에서는 과학단체들을 중심으로 본격적으로 인삼에 대한 연구가 시작되었다. 라이프니츠는 그런 연구의 중심지였던 왕립학회와 프랑스 왕립과학원을 방문하고 학자들과 교류를 나누었으며 독일에 그와 같은 연구기관을 설립하는 것을 평생의 목표로 삼았다. 라이프니츠는 로마를 방문했을 때 예수회 선교사들과 긴밀하게 교류하는 기회를 갖게 되었다. 그 과정에서 중국에 대한 지적 호기심이 한층 더 깊어갔고, 그 맥락에서 인삼에 대한 관심도 커갔다. 라이프니츠는 그리말디, 부베 등 중국선교에서 핵심적인 활동을 했던 학자들과 인삼의 효능에 대한 정보를 주고받게 된다. 이 논문은 유럽의 계몽주의에서 전혀 주목받지 못했던 인삼이 17세기 말 유럽의 학문적 지형과 지식인들 사이의 교류, 중상주의적 해외팽창을 얽어내는 단초가 될 수 있음을 제시한 것이다.