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Curing behavior of polyurethane as a binder for polymer-bonded explosives
이상묵,최종한,홍인권,이재욱 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The kinetics of the urethane-forming cure reaction of hydroxyl terminated polybutadiene (HTPB) withisophorone diisocyanate (IPDI) in presence of triphenyl bismuth (TPB) catalyst was investigated in thebulk state by using differential scanning calorimetry (DSC) and rheometry. The activation energies wereevaluated using the Kissinger method and the Ozawa method with multiple heating rates. Chemorheology in this system at isothermal condition was also studied and the value of activationenergy was in agreement with those obtained from DSC study. The master curve was constructed toestimate the essential information such as the pot-life duringmanufacturing polymer-bonded explosive(PBX) through the knowledge of gel times at given temperatures.
미디어 이용행태가 재・보궐 선거 후보자 결정요인에 미치는 영향에 관한 연구 -2011.4.27 경기도 성남시 분당을 지역 재・보궐 선거를 중심으로
이상묵,박성복,이정기 한국정치커뮤니케이션학회 2011 정치커뮤니케이션 연구 Vol. No.
This study was conceived by the recognition that most of the previous studies on re- and by-elections failed to fully consider the determinants of candidate evaluation and the media variables identified by the national-level voting determinants, heavily inclined toward the voters' demographic and sociopsychological variables. Thus this study divided the electorate of the Bundang re- and by-election in 2011 into those who voted for the ruling party candidate, those who voted for the opposition party candidate and those who did not cast a vote. The study also checked differences in sociodemographic characteristics, patterns of media usage, and determinants of candidates and examined the influence of patterns of media usage as an antecedent variable affecting the determinants of candidates. As a result, those who voted for the ruling party candidate, those who voted for the opposition party candidate and those who did not cast a vote in the Bundang re- and by-election had their own characteristics in sociodemographics, patterns of media usage, and determinants of candidates. The findings also confirmed the differential influences of the sociodemographic variables and the variables of media usage pattern. Based on the results, the study made suggestions to help to create a desirable election climate. 본 연구는 재・보궐 선거와 관련된 선행연구의 대부분이 유권자의 인구통계 변인, 사회심리적 변인 등에 치우쳐 있고, 전국단위의 투표결정요인으로 도출된 선거후보자 평가 결정요인과 미디어 변인을 충분히 고려하지 못하고 있다는 문제의식에서 출발하였다. 이에 본 연구는 2011년 분당을 지역 재・보궐 선거에서 여당 후보에 대한 투표자, 야당 후보에 대한 투표자, 비투표자를 구분하여 이들 사이의 인구사회적 특성, 미디어 이용행태, 선거후보자 결정요인의 차이를 확인하였다. 또한 선거후보자 결정요인에 영향을 미치는 미디어 이용행태의 영향력을 확인하였다. 연구결과 분당을 지역 유권자들 중 여당 후보에 대한 투표자, 야당 후보에 대한 투표자, 비투표자는 인구사회적 특성, 미디어 이용행태, 선거후보자 결정요인에 있어 각기 차별적인 특성을 가지고 있었다. 또한 미디어 이용행태 변인은 선거후보자 결정요인의 세부 변인에 차별적인 영향을 미쳤다. 본 연구는 이상의 연구결과를 바탕으로 바람직한 선거풍토 조성을 위한 제언을 하였다.
Water-assisted extrusion of polypropylene/clay nanocomposites in high shear condition
이상묵,유지수,이재욱 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Polypropylene (PP)/clay nanocomposites were prepared by water-assisted extrusion process at highshear rates. The effects of mixing methods of clay (with or without the use of water) and degree of shearrates on the properties of PP/clay nanocomposites were investigated by measuring their thermal,rheological, and tensile properties and morphology. The best properties were achieved when the claywas mixed in slurry state and the shear rates were high simultaneously. This was verified by both SEMand XRD showing a good dispersion status of the nano-clay in PP matrix for PP/clay nanocomposites. Expected mechanisms explaining the clay dispersions were proposed in this study. By these synergisticeffects of water and high shear rates, the PP/clay nanocomposites would be promising materials formany applications where economic feasibility is needed as well as good mechanical properties.
The Sources of Conventional and Unconventional Political Participation
이상묵,최장섭 한국세계지역학회 2006 世界地域硏究論叢 Vol.24 No.2
The purpose of this study is to investigate the modes of political participation and examine the sources of political participation in South Korea in the individual level. While previous studies have only focused on either conventional or unconventional political participation and are somewhat limited to industrial countries, this study deals with both types of political participation simultaneously and tests the findings derived from previous studies mainly based on industrial countries in the Korean contexts. For important sources of (un)conventional political participation, this study found that both political efficacy and partisanship are important factors in explaining not only conventional, but also unconventional political participation in Korea.