DMF 용액에서의 Acrylonitrile-Methylacrylate-Vinylpyrrolidone 3원 공중합체의 합성 및 특성 연구

이신희,김홍성,이명환,박수민,Lee, Shin Hee,Kim, Hong Sung,Lee, Myung Hwan,Park, Soo Min 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.10

This study is concerned with copolymerization of acrylonitrile (AN) with methylacrylate (MA), vinylpyrrolidone (VP) using the 2,2'-azobisisobutyronitrile (AIBN) initiator in dimethyl formamide (DMF) solution. In the free radical polymerization using DMF solution, the rate of polymerization is linearly increased with increasing monomer concentration. The extent of conversion is almost linearly increased with increasing polymerization time at the monomer concentrations of 27.67 wt%, 32.67 wt%, and 37.67 wt%, whereas an abrupt increase of the conversion rate is observed at higher monomer concentrations. In fact, the polymerization process at the monomer concentrations higher than 42.67 wt% was very difficult to control, because the extensive exothermic polymerization reaction accelerates the polymerization reaction. This indicates that an self-acceleration and irregular chain transfer reaction take place during polymerization. Thus, the number-average degree of polymerization is decreased with the monomer concentration. It was found that optimum concentration of monomer is 37.67 wt%. On the other hand, the limitting conversion and number-average degree of polymerization were increased with increasing VP content.

크론병의 한약 치료에 대한 최근 국내외 임상연구 동향

이신희,허유진,조연수,Lee, Shin Hee,Heo, Yu Jin,Cho, Yun Soo 대한한방소아과학회 2021 대한한방소아과학회지 Vol.35 No.4

Objectives The purpose of this study is to analyze the trend of herbal medicine treatment, treatment's effect and stability for Crohn's disease by reviewing clinical studies published over the past 5 years. Methods 22 articles which were published from 2017 to August, 2021 were obtained from the ScienceON, Research information sharing service (RISS), Koreanstudies Information Service System (KISS), Oriental medicine advanced searching integrated system (OASIS), China national knowledge infrastructure (CNKI), Pubmed. We analyzed the literature in regards to the treatment methods and results. Results There were 6 case reports, 1 controlled clinical trial, and 15 randomized controlled trial and in most cases, herbal medicines and Western medicines were administered in combination. The pathology of damp-heat due to spleen deficiency was the most common, and Sijunzi-tang and Shenling Baishu san were the most commonly used. As a result of the treatment, it was found that the combined administration of the herbal medicine and the Western medicine was more effective than the administration of the Western medicine alone. Conclusions Herbal treatment of Crohn's disease induced high cure rate safely than when only western treatment was applied. Future studies on safety and studies that can suggest specific guidelines for the combined administration of western and herbal medicines are needed.

대학생의 사회부과 완벽주의와 학업적 지연행동 간 관계에서 학습 무기력의 매개효과

이신희(Lee, Shin hee),김연수(Kim, Yeonsoo) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.3

목적 본 연구에서는 대학생의 사회부과 완벽주의와 학업적 지연행동 간의 관계에서 학습 무기력의 매개효과를 검증하고자 하였다. 방법 이를 위하여 2020년 6월부터 8월까지 J지역의 4년제 대학교에 재학 중인 만 19-29세의 남녀 대학생 325명(남 49명, 여 276명)을 대상으로 사회부과 완벽주의, 학업적 지연행동, 학습 무기력을 측정하였다. 수집된 사회부과 완벽주의, 학업적 지연행동, 학습 무기력 자료에 대해 기술통계와 상관분석을 실시하였으며 사회부과 완벽주의와 학업적 지연행동 간의 관계에서 학습 무기력의 매개효과를 알아보기 위해 구조방정식 모형을 사용하여 분석하였다, 또한 부트스트레핑을 통하여 매개효과의 유의성을 검증하였다. 결과 대학생의 사회부과적 완벽주의와 학업적 지연행동, 사회부과적 완벽주의와 학습 무기력, 학업적 지연행동과 학습 무기력 간에는 유의한 정적 상관이 있었다. 또한 사회부과적 완벽주의와 학업적 지연행동 간의 관계에서 학습 무기력의 완전매개효과가 나타났다. 결론 본 연구의 결과는 사회부과 완벽주의 경향을 보이는 대학생들의 학업적 지연행동을 경감시키기 위해서는 학습 무기력의 영향을 감소시키는 것이 도움이 될 수 있음을 보여주는 것으로 해석된다. 본 연구의 한계점과 후속연구를 위한 제언이 논의되었다. Objectives This study examined the mediating effect of academic helplessness in the relationship between socially prescribed perfectionism and academic procrastination. Methods From June 2020 to August, A total of 325 undergraduate students(male 49, female 276) participated in this study. They took a survey using the socially prescribed perfectionism(Multidimensional Perfectionism Scale: MPS), academic procratination(Aiken Procrastination Inventory: API), and academic helplessness. The collected data were analyzed using descriptive statistics, correlation, structural equation model, and bootstrapping was applied to verify for mediating effects. Results The results of this study were as follows. First, among socially prescribed perfectionism, academic procrastination, and academic helplessness, there were significant positive correlations. Second, academic helplessness fully mediated the relationship between socially prescribed perfectionism and academic procrastination. Conclusions The results of this study indicated that academic helplessness focused interventions may be effective for the academic procrastination of people with a high tendency of socially prescribed perfectionism. The implications of this results were discussed and the limitations and future directions of this study were suggested.

Dyeable polypropylene 직물의 열처리에 따른 물성변화

이신희 ( Shin Hee Lee ) 한국의류산업학회 2009 한국의류산업학회지 Vol.11 No.3

폴리아크릴로니트릴 공중합체의 극세 섬유제조 및 그 물성

이신희 ( Shin Hee Lee ) 한국의류산업학회 2012 한국의류산업학회지 Vol.14 No.3

The conditions of wet spinning were considered in order to prepare the fine denier of acrylic fiber. Polyacrylonitrile copolymer was synthesized by the copolymerization of acrylonitrile (AN) and methyl acrylate (MA) initiated by an aqueous sulfite-chlorate redox system. Acrylic fiber was manufactured through wet-spinning in a dimethyl formamide (DMF) system. The conditions of wet-spinning were investigated by i-value, spinning speed, diameter of spinneret, draw ratio, water content of spinning dope and morphology of protofiber. The physical properties of fibers were investigated by Instron. In this experiment, the minimum i-value decreased with the decreasing spinneret diameter, an increased spinning speed, and an increased coagulation bath (CBC) concentration. The maximum draw ratio increased with an increased CBC. The optimum CBC and water content of the spinning dope were 60%-65% and 3.5%, respectively. The tenacity at the breaking point increased with a decreased fineness of fiber. The elongation at breaking point was almost the same value as a function of the fineness of fiber.

스마트기기 사용에 따른 학생들의 테크노스트레스와 행복감 인식 연구

이신희 ( Shin Hee Lee ),김미량 ( Mi Ryang Kim ) 한국교육정보미디어학회(구 한국교육정보방송학회) 2016 교육정보미디어연구 Vol.22 No.2

스마트기기의 급속한 발전은 새로운 디지털 문화를 형성하였으며, 스마트폰을 위시로 한 스마트기기는 일생생활에서는 없어서는 안 될 생활필수품처럼 거의 필수적인 요소가 되어 버렸다. 스마트기기의 발전은 학생들의 학습 환경과 그들의 생활에도 많은 영향을 주었으며, 학생들은 스마트기기 사용에 많은 시간을 할애하고 그것에 집중하고 일상의 즐거움을 얻으면서 스마트기기를 통하여 나름대로 삶의 의미와 행복을 추구하고 있다. 그러나 이러한 스마트기기에 대한 집중과 지나친 사용은 테크노스트레스(technostress)라는 새로운 형태의 스트레스로 학생들에게 부작용을 일으키고 있다. 이러한 상황에도 불구하고 학생들의 스마트기기 사용의 몰입이 그들의 삶의 즐거움과 연결된다면 스마트기기를 사용하며 행복을 추구하는 학생들이 진정으로 행복한지에 대한 의문을 갖게 된다. 더욱이 지금까지 테크노 스트레스원에 의해 유발된 테크노스트레스와 개인의 행복감과의 관계에 관한 연구는 거의 이루어지고 있지 않았다. 이에 본 연구는 이러한 의문과 문제의식을 바탕으로 스마트기기 사용으로 유발된 테크노스트레스가 스마트기기 사용에 몰입하고 있는 학생들의 행복감에 어떠한 영향을 미치는지 연구해보고자 하였다. 또한 테크노스트레스가 스트레스대처방식, 자아탄력성 및 디지털 디톡스와 어떠한 관계가 있는지를 분석하고 스트레스 대처방식, 자아탄력성 및 디지털 디톡스가 행복감에 어떠한 영향을 미치는지 살펴보고자 하였다. 본연구를 위하여 서울시, 경기도, 강원도 소재의 중학생 393명과 고등학생 525명, 총 918명을 대상으로 설문을 진행하였다. 연구결과 테크노스트레스는 스트레스 대처방식, 자아탄력성, 디지털 디톡스에 유의미한 영향을 미치는 것으로 분석되었다. 그러나 테크노스트레스는 행복감에는 직접 영향을 미치지 않는 것으로 나타났으나 문제중심 대처방식, 자아탄력성 및 디지털 디톡스를 통하여 행복감에 미치는 간접 효과가 유의한 것으로 분석되었다. 이를 통하여 테크노스트레스가 행복감에 미치는 영향에 있어서 문제중심 대처방식, 자아탄력성, 디지털 디톡스가 행복감과의 관계에 있어 중요한 변인임을 확인할 수 있었다. 본 연구를 통하여 학생들에게 테크노스트레스를 알리고 테크노스트레스를 인지하도록 도와주고자 하였다. 또한 학생들의 행복감을 증진시키고 테크노스트레스를 경감시키기 위한 방안으로 문제중심 대처방식의 적극적인 활용, 자아탄력성 증진 및 디지털 디톡스 실천을 제안하였다. The rapid progress of smart devices has formed a new digital culture. Above all, smart devices including smart phones combined with the Internet have become a daily necessity and the center of life. This development of smart devices has also affected students’ learning environments and their lives, and while spending a lot of time on the use of smart devices, concentrating on it, and getting the enjoyment of everyday life, they are pursuing their own meaning and happiness in life through smart devices. However, inordinate focus on smart devices and excessive use of them is causing students a new kind of stress as a side effect called technostress. In spite of this situation, if students’ immersion in the use of smart devices is connected to the enjoyment of their lives, there is some question about whether the students, who pursue their own happiness through smart devices, are truly happy. Moreover, researches so far have been rarely conducted on the relationship between technostress caused by techno-stressors and individual happiness. Therefore, with this issue as the background, this research aims to examine how the technostress due to the use of smart devices have an impact on the students’ happiness. In addition, the impact of students’ technostress on their stress-coping methods, ego-resiliency, and digital detox - the intervening variables for this study - was analyzed. and this research aims to explore how stress-coping methods, ego-resiliency, and digital detox affect happiness. In this study, the data was collected through a survey of 393 middle school students and 525 high school students, a total of 918 students in Seoul, Gyeonggi and Gangwon Province. According to the results of the study, the technostress significantly affected the stress-coping method, ego-resiliency, and digital detox. The technostress was analyzed to have no direct, significant effect on happiness, while the indirect effect of technostress on happiness was significant through the problem-focused coping, ego-resiliency, and digital detox. It was proved that regarding the impact of technostress on happiness, the problem-focused coping, ego-resiliency, and digital detox were significant variables. Based on the analysis results of this research, ways to help students become apprised of technostress and aware of technostress were proposed. Moreover, in order to increase students’ happiness and to alleviate their technostress, ways to use the problem-focused coping, to increase ego-resiliency, and to practice digital detox were suggested.

기능성마이크로스피어의 제조와 응용(1) TiO2를 함유한 Poly(ethylene-co-vinylacetate) 공중합체의 마이크로스피어 제조 및 그 특성에 관한 연구

이신희 ( Shin Hee Lee ),박수민 ( Soo Min Park ) 한국의류산업학회 2008 한국의류산업학회지 Vol.10 No.2

기능성 마이크로스피어의 제조와 응용(2) 분산염료를 함유한 에틸렌-비닐아세테이트 중합체의 마이크로스피어 제조와 특성

이신희 ( Shin Hee Lee ),조현 ( Hyun Cho ),박수민 ( Soo Min Park ) 한국의류산업학회 2008 한국의류산업학회지 Vol.10 No.3

연구논문 : 저융점 복합사를 이용한 난연 폴리에스터 직물의 염색

이신희 ( Shin Hee Lee ) 한국의류산업학회 2013 한국의류산업학회지 Vol.15 No.3

This study investigates the dyeability and the fastness of flame retardant polyester fabric developed by a thermal bonding with a low melting component of flame retardant bicomponent filament (LMFRPC). The fabrics were prepared with flame retardant polyester filaments (FRP) as warp and blended filaments of FRP and LMFRPC as weft. The LMFRPC have a sheath and a core where the core comprises a flame retardant polyester and the sheath comprises a thermoplastic polyester with a low-melting point. The thermal bonding of fabric was conducted in a pin tenter at 170oC for 60 seconds. Fabric dyeing was conducted with an infrared dyeing machine at various dyeing temperatures and dyeing times. The dyestuffs used in this study were CI disperse Yellow 54, Red 60 and Blue 56 of E-type dyestuff and Orange 30, Red 167 and Blue 79 of S-type dyestuff. This study investigated the morphology of thermal bonded fabric, dyeability and fastness of dyed fabric. Dyeability increased with an increased dyeing temperature. The thermal bonded area increased with the increased LMFRPC content. The dyeability of S-type dyestuff was higher than E-type dyestuff; in addition, the saturated dyeing time was about 20minutes at 130oC for E and S-type dyestuff. The fastness to washing and rubbing were excellent at a 4-5 Grade.

시호계지탕가감방과 침구치료로 호전된 만성 복통 환아 4례

이신희(Shin Hee Lee),허유진(Yu Jin Heo),조연수(Yun Soo Cho) 한의병리학회 2021 동의생리병리학회지 Vol.35 No.6