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이인원(Inwon Lee),안남현(Nam Hyun An) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.5
A novel technique to measuret of viscoelastic properties of polymers is proposed to investigate complex Poisson’s ratio as a function of frequency. The forced vibration responses for the samples under the normal and the shear deformation are to be measured with varying load masses. The measured data were used to obtain the viscoelastic properties of the material based on an accurate 2D numerical deformation model of the sample. The 2D model enabled us to exclude data correction by the empirical form factor used in 1D model. Comprehensive measurements of viscoelastic properties of two slightly varied silicone RTV rubber (Silastic<SUP>®</SUP> S2) compositions were performed. Standard composition (90% PDMS polymer + 10% catalyst) and modified composition (92.5% polymer + 7.5% catalyst) were tested in temperature range from 30℃ to 70℃. Shear modulus, modulus of elasticity, loss factor, and both the real and the imaginary parts of the Poisson’s ratio were determined for frequencies from 50 to 400Hz in the linear deformation regime (at relative deformations 10<SUP>-4</SUP> ~10<SUP>-3</SUP>).
민주시민교육의 연구동향 분석 : 네트워크 분석을 통해 파악한 경향과 특징을 중심으로
이인원(InWon Lee),원준희(JunHee Won),이영미(Youngmi Lee) 한국국정관리학회 2021 현대사회와 행정 Vol.31 No.2
민주주의 운영의 실효성을 제고하기 위한 수단으로써의 민주시민교육에 대한 관심은 지난 수십년 간 지속적으로 증대했으며, 최근에는 거시적으로는 제도화 및 법제화에 대한 논의가 미시적으 로는 교수법 및 학습법에 대한 심도있는 논의가 진행되었다. 이 연구는 최근 20년(2001-2020)간 민주시민교육을 주제로 학술지에 게재된 학술논문들을 대상으로 내용분석과 네트워크 분석을 시행함으로써 해당 분야의 연구 경향과 그 핵심개념 간의 구조적 관계를 파악하고자 하였다. 이를 위해 총 381편의 학술논문을 대상으로 연도별 논문 수, 연구형태, 연구주제 및 빈도 및네트워크 구조 등을 분석하였다. 분석결과, 공동연구보다는 단독연구의 비중이 높았으며, 학문분 야로는 교육학의 비중이 높은 것으로 나타났다. 또한, 키워드 분석의 결과 ‘시민사회’, ‘시민교 육’, ‘시민참여’라는 키워드의 출현빈도가 가장 높은 것으로 나타났으며, 네트워크 중심성 분석의 결과 ‘민주사회’와 ‘학교교육’ 등이 다양한 개념들을 통합하는 중요한 개념들인 것으로 나타났다.; Democratic civic education, as important vehicles for promoting efficacy of democracy, has drawn a great deal of interest from both scholars and practitioners for a couple of decades in Korea. In recent years, discussions and researches on institutionalization and legalization at the macro level, and in-depth discussions on teaching and learning methods at the micro level have been conducted. This study analyzes trends and characteristics of researches on civic education in Korea from 2001-2020 by using social network analysis. Statistics and social network analysis results show that the proportion of single-authored research is much higher than that of co-authored research, compared to the result of other social science field. In addition, the keywords such as ‘civil society’, ‘civic education’, ‘citizen participation’ are frequently utilized as key concepts, Network analysis also demonstrates that ‘civil society’ and ‘civic education’ are important integrating concepts among several keywords in this research field.
유연벽면 점탄성 소재 배합비와 저항저감 효과의 상관관계
이인원(Inwon Lee),안남현(Nam Hyun An) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.6
A specially designed flat plate was mounted vertically over the axial line in the wind tunnel of the Pusan National University. Strain balances were mounted in the trailing part of the plate to measure the skin friction drag over removable insertions of 0.55´0.25㎡ size. A set of the insertions was designed and manufactured: 3 ㎜ thick polished metal surface and three compliant surfaces. The compliant surfaces were manufactured of a silicone rubber Silastic<SUP>®</SUP> S2 (Dow Corning company). To modify the viscoelastic properties of the rubber, its composition was varied: 90% rubber + 10% catalyst (standard), 92.5% + 7.5% (weak), 85% + 15% (strong). Modulus of elasticity and the loss factor were measured accurately for these materials in the frequency range from 40 ㎐ to 3 ㎑. The aging of the materials (variation of their properties) for the period of one year was documented as well. Along with the drag measurement using the strain balance, velocity and pressure were measured for different coating. The strong compliant coating achieved 5% drag reduction within a velocity range 20~40 m/s while standard and weak coatings increased drag reduction.
이인원(Inwon Lee),이기두(Kidu Lee),박영근(Youngkuen Park),임상수(Sangsoo Lim),백승욱(Seungwoock Baek),이대열(Daeyearl Lee) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.4
국내 최초로 개발되는 공대지 유도키트에 대하여 미국의 MIL-HDBK 및 STANDARD를 준용한 시험을 성공적으로 수행하였다. 각종 지상시험을 통하여 유도키트의 작동 성능과 내구성을 검증하였으며, 유도키트를 일반목적폭탄에 장착한 활공탄으로 비행시험을 수행하여 중거리 활공비행성능 및 정확도가 매우 양호함을 확인하였다. Tests and evaluations following the U.S. MIL-HDBK/STANDARD were successfully conducted to assure the performance of the air-to-surface guidance kit which was developed first in Korea. Various ground tests confirmed the operation capability and reliability of the guidance kit, and flight tests proved very good mid-range gliding performance and accuracy of the gliding bomb which was a general purpose bomb with the guidance kit.
압력변동 및 속도장 조건부 평균에 의한 후향계단 유동의 응집구조
이인원(Inwon Lee),성형진(Hyung-Jin Sung),이인섭(In-Seop Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Time-dependent characteristics of wall pressure fluctuations in separated and reattaching flows over a backward-facing step were investigated by means of continuous wavelet transform. Emphasis was placed on the combination of time-localized analyses of wavelet transform and multi-point measurements of pressure fluctuations. Synchronized wavelet maps revealed the evolutionary behavior of pressure fluctuations and gave further insight into the modulated nature of large-scale vortical structures. It was found that there exist two modes of shed vortices: one is the global oscillation and the other is the vortex convection. The two alternating modes are synchronized with the flapping frequency component of pressure fluctuations. Toward the investigation of the direct relationship between the flow field and the relevant spatial mode of the pressure field, a new kind of wavenumber filtering of pressure distribution, termed as a spatial box filter (SBF), is introduced and examined.