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용매에 따른 Ionomer Networks 의 구조변화에 대한 고찰
서경도,김주영,송승환 한국공업화학회 1998 응용화학 Vol.2 No.2
Very different structures and properties result from the preparation of polymer networks from the same weakly charged polyurethane acrylate anionomer (UAA) dissolved in two different solvents, water and dioxane, during cross-linking. The UAA polymer readily dissolved in organic solvent such as dioxane but forms dispersions with water. Networks prepared in water (UAAG networks) and then dried show much higher hydrophilicity (swelling in water of PM 11) than their counterparts (UADG network), which are cross-linked in dioxane and then dried. The different thermodynamic equilibrium structures achieved in the two polymer/solvent mixtures are locked into different network structures by the cross-linking reaction.
서경도,이정은 동북아관광학회 2016 동북아관광연구 Vol.12 No.1
본 연구는 우리의 일상생활 속에서 담고 있는 여러 변수 중 재미를 중심적인 개념으로, 성격(personality), 재미(fun), 애착(attachment), 행동의도(behavior Intention) 의 연구개념의 이해를 규명하여 또 하나의 자료를 제시하고자 하였다. 연구목적을 위하여 상위가설을 5개를 설정하여 다중회귀분석으로 가설을 검증하였다. 가설검증 결과 가설인 변수와 변수간의 관계에 유의미한 결과를 도출하여 그 의미를 파악하였다. 따라서 본 연구를 위한 가설검증에 따른 유의미한 점은 개인의 성격이재미, 애착, 행동의도간의 유의미한 관계가 있다. 본 연구를 통해서 개인의 특징을 나타낼 수 있는 성격과 상황적이며 가변적인 재미의 특징간의 관계이기에 때문에 한마디로 정의하기에는 힘들지만 성격과 재미(fun)와의 관계를 파악한 것은 나름대로 의미가 있다. The purpose of this paper is to examine how Personality influences Fun & Attachment on find how it Behavior Intention. To Research this study, the survey questionaires were randomly distributed to tourist Busan Metropolitan city Korea. After setting the hypotheses constructed a theoretical background to the relationship after verifying the hypothesis was verified. Hypothesis testing was performed by multiple regression analysis. Each test results were statistically significant relationship between the two, depending on the nature and purpose of each factor is that individuals have, we know the attachment relationships that are significant for the degree of action. The subjective nature of the relationship between the propensity seen over the medium to strong fun has its meaning
UV - curable silicone - based urethane acrylate anionomer 의 합성과 그의 코팅 특성
서경도,조유건,이준우,김주영 한국공업화학회 1998 응용화학 Vol.2 No.2
The synthesis of silicone-based urethane acrylate anionomer (SUAA) was performed via stepwise reaction procedure, using hydroxy-terminated polydimethylsiloxane (PDMS) as a soft segment, isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and 2-hydroxyethyl methacrylate (2-HEMA). Particularly, DMPA impart ionic hydrophilic site into molecular backbone, leading to obtain the water-soluble prepolymer. SUAA was neutralized by triethylamine to increase solubility in water. Silicone-based urethane acrylate (SUA) which doesn't have pedant ionic site was also synthesized. With the introduction of silicone group in urethane and ionic site in SUA, change in mechanical properties and coating properties were studied. SUA that was not incorporated ionic site was flexible, while SUAA having pedant ionic groups was brittle.
Silicone - Based Urethane Acrylate Anionomer 의 합성과 그의 특성 분석에 관한 연구
서경도,이준우 한국공업화학회 1998 응용화학 Vol.2 No.1
The synthesis of silicone-based urethane acrylate anionomer (SUAA) was performed via stepwise reaction procedure, using hydroxy-terminated polydimethylsiloxane (PDMS) as a soft segment, isophorone diisocyanate (IPDI), dimethylol-propionic acid (DMPA), and 2-hydroxyethyl methacrylate (2-HEMA). Particularly, DMPA incorporated into the molecular backbone acted as a strong hydrophilic site, leading to obtain the water-soluble prepolymer. SUAA readily solved in water. Characterization of SUAA was carried out by ¹H-NMR.
서경도,최정일,최판암 대한산업경영학회 2020 산업융합연구 Vol.18 No.3
The purpose of this study is to make suggestions for the infectious disease surveillance systems as part of the government’s healthcare policy intended to minimize damage by implementing an appropriate and swift crisis management in the event of future infectious disease outbreaks. To that end, this descriptive study analyzes the infectious disease outbreaks and the management and control thereof in Korea and other countries, so as to suggest some approaches to infectious disease surveillance systems applicable to affected regions. The analysis results shed light on the causes of the spread of future infectious diseases over the past years, and the management systems that could possibly deal with the trial and error in the response policy. It seems crucial to roll out appropriate information, training and promotion programs as part of the national disaster response systems to prevent infectious diseases in relation to the roles of multiple relevant government agencies in the event of disasters especially amid the COVID-19 pandemic.