Synthesis of a polyketone ion exchange fiber

정윤서,현승미,황택성 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

These Polyketone is characterized by a high mechanical intensity, chemical resistance, heat resistance, and aging resistance. Therefore, PK offers many properties that are advantageous in membrane applications and production. Using the UV grafting technique, polyketone fiber was fabricated. Fourier-transform infrared (FTIR) spectroscopy was used to characterize the ion exchange fiber. The water uptake (W.U), ion exchange capacity (IEC) and electrical resistance (E.R) of the membrane were measured to evaluate the physical properties of prepared membranes. The prepared fibers were applied to the chemical filter, in which their gas removal rates were evaluated.

청소년의 정치 참여에 영향을 미치는 예측 요인 연구 -조건적 정치커뮤니케이션 효과 모델 (O1-S-O2-R)의 적용-

정윤서 한국외국어대학교 국제커뮤니케이션연구소 2011 東西言路 Vol.29 No.-

그동안, 정치커뮤니케이션학 분야에서 청소년을 대상으로 하는 연구의 중요성이 간과되어 왔고, 일반적으로 정치참여에 대한 기존 연구들이 정 치 참여 방식 중 하나인 ‘선거’에만 초점을 맞춰왔다는 비판이 제기되었 다. 이번 연구는 좀 더 폭 넓은 시각에서 정치 참여를 논의할 수 있는 단 초를 제공하기 위해 2012년에 치러질 제 18대 대통령 선거에서 첫 투표를 하게 될 만 16세부터 만 18세 청소년을 대상으로 비선거적 정치 참여(사 회 봉사활동 참여, 시민단체 활동 참여, 촛불 집회 참여, 서명운동 참여, 사회적ㆍ정치적 성격의 기부, 특정 상표 구매ㆍ불매운동 참여, 학교ㆍ학급 차원의 참여 등)에 영향을 주는 다양한 예측 요인들을 검토했다. 또한 단 순한 자극과 반응(S-R)모델을 넘어서, 인구통계학적 특성이나 개인적 선유 경향(O1), 정치지식, 정치 냉소주의, 정치 효능감 등(O2) 다른 여러 예측 요인들의 상대적 영향력까지 검증 했다. 2009년 10월, 서울시와 경기도 의 정부시 소재 고등학교에 재학 중인 청소년 373명을 대상으로 설문조사를 실시한 결과, 청소년들의 정치 참여에 있어서 정치 효능감과 정치 사안에 대한 관심도가 가장 중요한 영향력으로 분석되었다. 또한 인터넷 이용을 많이 할수록, 가구 평균 소득이 많을수록, 남학생보다는 여학생이 정치 참 여를 많이 하는 것으로 나타났다. 이번 분석 결과를 통해 청소년의 정치 참여를 향상시키기 위해서 정치 효능감과 정치 사안에 대한 관심을 증진 시킬 수 있는 교육적 차원의 방안 모색이 필수적임을 알 수 있다. Fostering civic engagement among youth is important. However, factors that influence youth participation in civic life have not been studied in Korea. The purpose of the present study was to analyze antecedent factors affecting youth civic engagement. The data for this study were collected by conducting a survey among 364 residents of Uijeongbu and Seoul aged between 16 and 18 years for 6 days. Applying O1-S-O2-R model, the relationships among civic engagement, dispositional factors, communication variables, political knowledge, political disaffection, and political efficacy were examined. The results suggest that both political efficacy and political interest are the most influential factors on youth participation in public affairs. Other factors that have positive impact on youth civic engagement include increased internet use, high family income, and the female gender. Overall, the findings indicate that improving political efficacy and political interest is most critical in promoting youth civic engagement.

Synthesis of Sulfonated Polyketone Membrane for Redox Flow Battery

정윤서,황성연,Ali Canlier,황택성 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.1

Synthesis of Highly Durable Cation Exchange Membranes

정윤서,박은지,장한나,임재석,유혜성,김경태,황택성 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.2

Synthesis of sulfonated polyketone cation exchange membranes by direct sulfonation and their properties

정윤서,박은지,황성연,( Ali Canlier ),황택성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Polyketone is a thermoplastic polymer with excellent chemical and physical stability. Because of its excellent stability, it is not easy to attach it functional groups to PK chain, thus many studies are under way. In this study, polyketone cation exchange membranes were prepared by direct sulfonation reaction of polyketones with chlorosulfonic acid. FT-IR, elemental analysis, SEM and XPS analysis were carried out to confirm the structure of polyketone membrane with cation exchanger. Also, basic properties such as water uptake, swelling ratio, ion exchange capacity and electrical resistance were measured.

Desalination properties of sulfonated PK-g-SSS membrane by CDI unit cell

정윤서,박은지,황성연,황택성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Polyketone was graft copolymerized with sodium styrene sulfonate (SSS) in the presence of additives such as Mohr’s salt and H₂SO₄. Fourier-transform infrared (FT IR) spectroscopy was used to characterize the grafted membrane. The water uptake (W.U), ion exchange capacity (IEC) and electrical resistance (E.R) of the membrane were measured to evaluate the physical properties of prepared membranes. The prepared membranes were applied to the membrane capacitive deionization process (MCDI), in which their salt removal rates were evaluated and compared to CDI (capacitive deionization).

Variation in repeated measurements of transepidermal water loss, skin hydration, and sebum level in normal beagle dogs

정윤서,윤태식,강지훈,양만표,강병택 충북대학교 동물의학연구소 2017 Journal of Biomedical and Translational Research Vol.18 No.3

Skin barrier function can be assessed non-invasively, including by transepidermal water loss (TEWL), skin hydration, and sebum level. The aim of this study was to evaluate day-to-day variation in measurements of TEWL, skin hydration, and sebum level at various anatomic sites and the relationship between these parameters in normal dogs. Measurements were repeated five times on two separate days in five clinically normal Beagle dogs at seven anatomic sites, i.e., the left and right pinnae, left and right axillae, left and right groin areas, and ventrum. Coefficient of variation was used to show the variation in measurements. Correlations between each of the measurements were analyzed to determine the contribution of skin hydration and sebum level to TEWL. There was no variation in the measurements obtained according to time or anatomic site (P>0.05). The coefficient of variation was highest for sebum level (209.0 ± 81.8%) followed in descending order by skin hydration (62.7 ± 34.5%) and TEWL (41.1 ± 6.9%). Of the seven anatomic sites sampled, the left and right pinnae showed the lowest variation in repeated measurements for TEWL (39.2%), skin hydration (29.6%), and sebum level (75.5%). There was no significant relationship between the results for each measurement (P>0.05). Because of its relatively low variation on repeated measurement, TEWL might be the most useful way of evaluating skin condition in dogs.

Introduction of a Highly Efficient and Facile Method of Allylation for Polyketone Membranes with Strong Chemical Resistance and Mechanical Strength

정윤서,박은지,황성연,( Ali Canlier ),황택성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Polyketone is a thermoplastic polymer known for its strong mechanical properties and chemical resistance. Such superiorities make it difficult to process and modify chemically for further functionalizations and applications. In this work, we introduce a novel method for functionalizing the alpha carbon of polyketone. We succeeded to attach allyl groups to the backbone of polyketone by a heterogeneous reaction between polyketone enolate and allyl bromide. Allylated polyketone is not soluble in common solvents. Since we started with a membrane of polyketone, there is no need to cast again. Further functionalization is possible through pending allyl groups via alkene addition reactions and ionic or radicalic polymerization.

Fabrication of Monolayer Polystyrene Pattern with Various and Complex Three-dimensional Structuresthrough Mold-assisted Lithographic Technology

정윤서,전환진 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

청소년이 지각하는 푸드 카빙에 대한 직업이미지가 진로결정수준에 미치는 영향에 있어 사회적 지지의 조절효과

정윤서,라채일 한국관광산업학회 2019 Tourism Research Vol.44 No.4

This research there is no job category but an understanding of the image of food carving that can be regarded as a professional job, and discover the relationship that affects the level of decision making in a career to provide base data of counseling career and education for students. I also looked into controlling effects of social support in the relationship between job image and level of decision making in a career. This is because the importance of social support is emerging for successful change from adolescence to adulthood. The result of field test came out as following: Firstly, after analyzing technical statistics on itemized job image about food carving, the job image on food carving guarantees professionalism and autonomy but compensation is low and social reputation is not good comparatively. Secondly, after testing relationship between job image and level of decision making in careers, in order of compensation, professionalism, social reputation, job characteristics, working environment effect this level. Thirdly, as a result of examining the controlling effect of social support in relationship between job image and level of decision making in careers, this level increased more when people perceive highly on professionalism, working environment, social reputation and emotional support at same time, and also increased if people perceive higher on compensation, professionalism, social reputation and informational support at same time. Also, the level of decision making in careers increased when people perceive high to compensation and business characteristics not only perceiving in physical support, and also increased when they perceive higher to compensation and speciality not only perceiving evaluation support among job images. This means the level of decision making in careers becomes different depending on what type of social support people perceive most among various composing factors in job image. Therefore to make food carving as a job we will have to do active PPL through mass media in association and various kinds of food carving related meetings or hold all kinds of competitions and change cognition of public. Also see food carving as job through various social support and help teenager making decision for careers. 본 연구에서는 아직 직업적 분류가 없으나, 향후 전문 직업으로 인식될 수 있는 푸드 카빙에 대한 직업이미지를 파악하고, 이러한 직업이미지가 진로결정수준에 미치는 영향관계를 파악하여, 학생들의 진로상담 및 교육의 기초자료를 제공하고자 한다. 또한 직업이미지가 진로결정수준에 미치는 영향관계에 있어 사회적 지지의 조절효과를 파악하였다. 이는 청년기에서 성인기로의 성공적인 전환을 위해서 사회적 지지의 중요성이 밝혀지고 있기 때문이다. 실증분석 결과 다음과 같은 연구결과가 도출되었다. 첫째, 푸드 카빙에 대한 직업이미지의 항목별 기술통계분석을 실시한 결과 푸드 카빙에 대한 직업이미지는 전문성과 자율성이 보장되지만 보상이 낮고 사회적 평판이 상대적으로 좋지 않는 직업이미지로 나타났다. 둘째, 직업이미지와 진로결정수준의 영향관계를 검증한 결과 직업이미지 중 보상, 전문성, 사회적 평판, 업무특성, 업무환경 순으로 진로결정수준에 더 많은 영향을 미치는 것으로 나타났다. 셋째, 직업이미지와 진로결정수준의 관계에서 사회적지지의 조절효과를 검증한 결과 직업이미지 중 전문성, 업무환경, 사회적 평판에 대해 높게 지각하고 동시에 정서적지지에 대해 높게 지각하면 진로결정수준이 더 증가하는 것으로 나타났으며, 직업이미지 중 보상, 전문성, 사회적 평판에 대해 높게 지각하고 동시에 정보적지지에 대해 높게 지각하면 진로결정수준이 더 증가하는 것으로 나타났다. 또한 직업이미지 중 보상 및 업무특성에 대해 높게 지각하고 동시에 물질적지지에 대해 높게 지각하면 진로결정수준이 더 증가하는 것으로 나타났으며, 직업이미지 중 보상 및 전문성에 대해 높게 지각하고 동시에 평가적지지에 대해 높게 지각하면 진로결정수준이 더 증가하는 것으로 나타났다. 즉 직업이미지의 다양한 구성요소 중 어떠한 유형의 사회적 지지에 대해 높게 지각하느냐에 따라 진로결정수준이 달라진다는 것이다. 따라서 푸드 카빙을 하나의 직업군으로 인식시키기 위해서는 이에 협회 및 각종 푸드 카빙과 관련된 모임 등에서 대중매체를 통한 활발한 PPL을 행하거나 각종 대회 등을 개최하여 대중들의 인식전환을 해야 할 것이다. 또한 다양한 사회적 지지를 통해 푸드 카빙을 직업으로 인식하고 청소년들이 진로를 결정하는데 있어 도움을 주어야 할 것이다.