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李代雄 陸軍士官學校 1976 한국군사학논집 Vol.15 No.-
We have amended the Constitution Law for seven times since May 10, 1948. Among them, the Yu-Sin Constitution, which was publicly notified, on Oct. 27. 1972, through th consultation and decision of the Emergency Cabinet Council and was finally confirmed by the national referendum on Nov. 11, 1972, is peculiar in that it is a revision with the purpose of reviralizing reformation in order to orient toward the peaceful unification of the country and to establish the basis for stability and prosperity.
Tandem 기술을 이용한 비대칭 다단 결합선로 결합기 설계
이대웅,안달 순천향대학교 부설 산업기술연구소 2015 순천향 산업기술연구소논문집 Vol.21 No.2
In this paper, we propose a new multi-section asymmetric directional coupler with tandem type method on the tight coupling section. It is design and simulation for coupler has –3dB coupling coefficient. The propose asymmetric multi-section directional coupler is consist of six coupled lines including coupled section with tandem technique. Its result has –3dB ± 1dB in 0.5GHz∼3GHz, and fractional bandwidth of coupler is 142.85%. And also, it has an advantage in insertion loss compare than conventional tandem coupler structure.
이대웅,오소형,임대현,정회범,유승을,구영모,박권필,Lee, Daewoong,Lim, Daehyun,Oh, Sohyeong,Chung, Hoi-Bum,Yoo, Seung-Eul,Ku, Young-Mo,Park, Kwonpil 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.2
In the proton exchange membrane fuel cells (PEMFC), the development of a reinforced membrane with improved durability by a support is actively in progress in Korea. In this study, the initial performance and characteristics of four types of reinforced membranes were compared. Reinforced membranes with higher amounts of C-F chains in the polymer membrane showed lower water diffusion coefficients due to the hydrophobicity of the C-F chains. The thicker the polymer membrane, the more the hydrogen permeability decreased and the higher the OCV. Membrane with short resistance below 1.5 Ωcm<sup>2</sup> showed OCV below 0.9 V and the lowest performance, so short resistance should be above 3.0 Ωcm<sup>2</sup>. Compared with the current standard membrane, there was a similar domestic membrane, which could confirm the possibility of localization of PEMFC polymer membrane. 고분자전해질 연료전지(PEMFC)에서 지지체에 의해 내구성을 향상시킨 강화막(Reinforced Membrane)의 개발이 국내에서 활발히 진행되고 있다. 본 연구에서는 4 종류의 강화막의 초기 성능 및 특성을 비교하였다. 고분자막의 C-F사슬의 양이 더 많은 강화막이 C-F사슬의 소수성 때문에 물 확산계수가 더 작음을 보였다. 고분자막 두께가 두꺼울수록 수소투과도가 감소하고 OCV가 증가함을 확인하였다. Short 저항이 1.5 Ωcm<sup>2</sup> 이하인 막은 OCV가 0.9 V이하이고 성능도 최저여서 Short 저항이 3.0 Ωcm<sup>2</sup> 이상이어야 함을 보였다. 현재 기준이 되는 국외 막과 비교했을 때 비슷한 국내 막도 있어서 PEMFC 고분자막의 국산화 가능성을 확인할 수 있었다.
이대웅,손주희,권기헌 한국정책분석평가학회 2016 政策分析評價學會報 Vol.26 No.2
본 연구에서는 현대 사회에서 나타나는 중요한 사회 문제(social problem) 중 하나인 청소년 학교 폭력에 대한 선제적 정책대안 모색을 위해, 데이터마이닝(data mining) 의사결정나무(decision tree) 분석을 실시하였다. 특히, 청소년의 학교폭력 가해행동 위험예측을 위해 요인 간의 상호작용 (interaction) 패턴에 대한 분석을 시도하였고, 이를 통해 가해행동을 예측하고, 고위험 집단군 도출 및 개개인이 가지고 있는 다양한 상황과 특성들에 적합한 개별적 개입 방안을 마련하는 근거를 제시하고자 하였다. 의사결정나무 분석결과, 학교폭력 가해행위에 영향을 미치는 주요한 위험요인은 ‘비행친구의 수’와 개인의 ‘공격성’・‘우울성’・‘진로정체감’, 부모의 ‘감독’・‘학대’・‘과잉기대’, 학교의 ‘학습활동’ 등으로 도출 되었다. 특히, 변수 간의 조합에 있어서도 학교폭력 가해행동에 있어 고위험집단은 ‘비행친구의 수’가 많고, 개인의 ‘공격적 성향’이 높으며, 부모의 양육방식에 있어 ‘낮은 감독수준’인 것으로 도출되었다. 다만, 부모의 유대관계 및 양육태도에 있어 과잉기대, 지나친 억압과 통제는 오히려 자녀의 학교폭력 가해행동의 가능성을 높이는 위험요인으로 나타났다. 따라서 본 연구에서는 전술한 분석결과를 토대로, 청소년들의 학교폭력을 예방하기 위한 정책적 함의를 제시하며 향후 관련 정책설계 및 대응방안 구축에 기여하고자 한다.
자동차 공조 시스템에서 중량 저감을 위하여 1.2t 두께를 갖는 AHU의 개발
이대웅,윤정훈 한국자동차공학회 2019 한국 자동차공학회논문집 Vol.27 No.10
Recent trends in vehicle development have gradually been focused on fuel consumption and tailpipe emission. The greenhouse gas(GHG) regulations require a reduction in emission of roughly 30 % for the next 10 years. As a result, the automotive industry has a major challenge to enhance the fuel economy each year. In order to improve fuel economy, one of the solutions is to reduce the weight of the vehicle not only in the chassis parts, but also in the cabin components. Therefore, an attempt has been made to meet those requirements by developing an air handling unit(AHU) housing with a thickness of 1.2. For successful tooling, CAE analysis to implement an AHU housing with a thickness of 1.2 has been performed, taking into account both dynamic stiffness and injection mold flow analysis. Meanwhile, AHU housing mold for mass production was developed as optimized, taking into account the gate number, filling time, injection pressure and temperature, clamping force, volumetric shrinkage and deformation, and the mass product of AHU. Subsequently, the product made from mold met the engineering specification and design criteria through a radiated sound experiment. In this study, an AHU with a thickness of 1.2 was successfully developed by optimizing the mold structure and injection molding conditions, and attained the same dynamic stiffness and radiation sound as the current AHU housing with a thickness of 1.7 while reducing the weight by approximately 20 %.
이대웅,유성연 대한설비공학회 2002 설비공학 논문집 Vol.14 No.4
For successful design of component, performances of one-tank plate type evaporator, gas-liquid separation type condenser, swash plate type compressor and thermostatic expansion valve for automotive air conditioner are investigated experimentally. Heat transfer characteristics in the evaporator are examined by means of air temperature, relative humidity, air volume flow, outlet refrigerant pressure and superheat, and heat transfer characteristics in the condenser are examined by means of air temperature, air velocity and inlet refrigerant pressure. Pressure drops for both evaporator and condenser are measured arid empirical correlations are derived. Volumetric efficiencies and isentropic efficiencies for trio types of compressors with different capacity are measured and compared. Thermostatic expansion valve is tested to investigate the pressure variation according to temperature changes.