Stop flow lithography synthesis of organic solvent-based particles via NOA channel

엄지연,김동욱,이준호,봉기완 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

There exist some limitations using Polydimethylsiloxane (PDMS) in microfluidic channels : short-term deformation surface conditions and high pressure deformation. However, due to several advantages such as low cost, biocompatibility and gas permeability, PDMS has been the most common material for microfluidic use. Still, PDMS devices that perform microfluidic processes using organic solvents impose an important limitation known as swelling. Herein, we introduce Norland Optical Adhesive (NOA) as a replacement for PDMS for organic solventbased operation. However, the low permeability of NOA to oxygen prevents NOA devices from applying microfluidic technology called static flow lithography (SFL). We present a method of manufacturing a NOA device for microfluidic processing through PDMS coating for SFL applications. The device extends the material selection of the microfluidic process with organic solvents and consequently increases the chemical diversity of the particles.

OTT 서비스 정보시스템 품질이 재사용의도에 미치는 영향

엄지연,임영우,곽기영 한국정보시스템학회 2023 情報시스템硏究 Vol.32 No.3

Purpose With the continuous growth of the OTT services market, trust issues are becoming increasingly important, but research on this topic is still in its infancy. The purpose of this study is to identify the structural relationship between information system quality and reuse intention of OTT services and to analyze the impact of trust and user satisfaction. Design/methodology/approach This study proposed a research model based on the information system success model. In this study, a survey was conducted among 236 Korean users who have used OTT services within the last six months. Findings The results of the analysis showed that text quality and visual quality had a significant impact on trust in OTT services, with text quality having the largest impact. System quality and text quality also had a significant impact on trust in OTT service providers. However, visual quality did not have a statistically significant effect on trust in the service provider. Trust in the OTT service and the service provider was analyzed to have a significant impact on user satisfaction. However, it did not have a statistically significant impact on reuse intention. These findings have important implications for improving trust in OTT services to increase users' reuse intentions. It is also expected to contribute to further expanding the field of OTT service research.

경남지역에서 유통되는 즉석 반찬류의 미생물 오염도 조사

엄지연,장혜정,최연주,김소영,조아름,김민영,안지희,김제동,Ji-Yeon Um,Hye-Jeong Jang,Yeon-Ju Choi,So-Young Kim,Areum Jo,Min Young Kim,Jihee Ahn,Jea-Dong Kim 한국식품위생안전성학회 2023 한국식품위생안전성학회지 Vol.38 No.4

The consumption of ready-to-eat side dishes is rapidly growing in South Korea. These foods are particularly vulnerable to microbiological contamination as they are often cooked without any treatment, such as heating or stored at room temperature after cooking. Hence, in 2022, we analyzed the ready-to-eat side dishes sold in Gyeongsangnam-do, South Korea for microbiological contamination. We collected 100 samples from supermarkets in 7 cities, and then examined them for presence of food-borne pathogens and sanitary indicator bacteria. In the analysis of the food-borne pathogens, Bacillus cereus and Clostridium perfringens were isolated from 51 samples (51.0%) and 3 samples (3.0%), respectively. However, both quantitatively met the Korean Food Standards Codex. Genes of five different enterotoxins and one emetic toxin were analyzed from the 51 isolated B. cereus strains. We detected enterotoxin entFM (100.0%), nheA (94.1%), hblC (58.8%), cytK (56.9%), and bceT (41.2%) in 51 isolates, and emetic toxin gene, CER, in only one (2.0%) isolate. We did not detect C. perfringens toxin gene (cpe) that causes food poisoning in any one of the three C. perfringens isolates. In the case of sanitary indicator bacteria, Kimchi had the highest levels of total aerobic bacteria and coliforms, followed by Saengchae, Jeotgal, Jeolim, Namul, and Jorim, respectively. We counted total aerobic bacteria at two different storage temperatures (4℃ and 20℃) to determine the effect of storage temperature. When stored at 20℃, total aerobic bacteria count increased in most of the ready-to-eat side dishes, except for Jeotgal. This result conclusively shows the need for refrigerating the ready-to-eat side dishes after purchase. Further research is needed to assess the risk and safety of the ready-to-eat side dishes available in the market and determine appropriate safety management practices.

임부의 내분비계 장애물질 노출저감화행동의 영향요인

엄지연,전은영 한국가정간호학회 2023 가정간호학회지 Vol.30 No.2

Purpose: This study attempted to determine the factors related to behaviors of reducing exposure to endocrine disrupting chemicals (BRE to EDCs) in pregnancy, based on the PRECEDE model. Methods: A cross-sectional survey was conducted with participants (N=239) who met the medical records and eligibility criteria from the Women's Hospital and Public Health Center. Data were collected using a specially-designed questionnaire based on the PRECEDE model and included BRE to EDCs predisposing factors, reinforcing factors, and enabling factors. The data were analyzed using the chi-square test, independent t-test, one way ANOVA, Pearson's correlation coefficients and a hierarchical multiple regression analysis. Results: In Model Ⅰ it was found that participation in prenatal education influenced the BRE to EDCs significantly; and a regression showed that the determinant variables accounted for 3.4%. In Model Ⅱ, the predisposing factors of perceived barriers of BRE to EDCs and environmental self-efficacy were added. It was shown that they significantly influenced BRE to EDCs in the order named, and a regression revealed that increases in the determinant variables accounted for 22.5%. In Model Ⅲ, to which enabling factors were added, the information acquisition experience of BRE to EDCs interacted significantly with BRE to EDCs and a regression showed an increase in the determinant variables accounting for 25.3%. Conclusion: The results of this study, the content of endocrine disruptors must be included in the prenatal care education program for pregnant women, and it should be composed of contents that can reduce the perceived obstacle to BRE to EDCs, enhance the environmental self-efficacy, and provide the information in regard to reducing exposure to EDCs. .

신시가지 개발이 구도심의 폭염취약성 변화에 미치는 영향 - 혁신도시 진주, 나주를 중심으로 -

엄지연 서울대학교 환경대학원 2022 環境論叢 Vol.69 No.-

Jigsaw 협동학습법 적용이 자기주도 학습능력, 학습과제 해결 능력 및 수업만족도에 미치는 효과

엄지연,신미경 사단법인 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.12

The purpose of this study was to analyze the effect of the 12 weeks application of Jigsaw collaborative learning study method on self-led learning capabilities task solving ability and class satisfaction of nursing students. This study is based on an experiment on a subject of a single group. The research procedure was applied to the basic nursing class contents such as nutrition, bowel movements, activity and exercise, skin integration, personal hygiene, and medication after learning jigsaw collaborative learning method. The study group consisted of confirmation of learning tasks, assignment of tasks by group, planing of learning activities, expert group collaborative learning, cooperative learning in group, group presentation, organizational learning contents and query time. The average of ‘Planning action plan’ one of the subcategory of ‘Task solving ability ’(t=2.849, p=.007) and the average of ‘Solving the tasks needed for the lesson more autonomously’ one of the subcategory of ‘Self-led learning capabilities’ had been improved (t=2.625, p=.012). Also the average of the total score for class satisfaction increased (p=.001). To improve the nursing ability we should apply the Jigsaw learning collaborative study method to nursing education continuously. 본 연구는 Jigsaw 협동학습법의 적용 효과를 알아보기 위한 목적으로 간호 대학생에게 12주 동안 수업 교수법으로 활용하여 자기주도 학습능력과 학습과제 해결 능력 및 수업만족도를 비교 분석한 단일군 사전 사후 유사 실험 연구이다. 연구진행절차는 기본간호학수업 내용인 영양, 배변, 활동과 운동, 피부통합성, 개인위생, 투약에 관한 사전 학습 후 jigsaw 협동학습법을 적용하였다. 학습과제 확인, 그룹별 과제 분담하기, 학습활동 계획하기, 전문가집단 협동학습, 그룹 내에서 협동학습, 조별 발표, 교수자의 학습내용 정리, 질의시간으로 진행되었다. 그 결과 학습과제 해결 능력의 하위항목 중 계획성(t=2.849, p=.007) 항목에서 그리고 대상자의 자기주도 학습능력의 하위항목 중 자율성(t=2.625, p=.012)에서 통계적으로 유의한 향상을 보였다. 수업만족도에서도 평균의 통계적으로 유의한 향상을 보였다(p=.001). 간호사의 임상현장에서 필요로 하는 자율성과 계획성을 양성하기 위하여 계속적인 협동학습의 간호교육에 적용이 요구된다.

메타버스 내 몰입이 아바타 동일시, 브랜드 충성도, 브랜드 아이템 구매의도에 미치는 영향

엄지연,임영우,곽기영 한국경영정보학회 2024 Information systems review Vol.26 No.2

본 연구는 최근 다양한 분야에서 주목받고 있는 메타버스의 이용 행태를 실증적으로 분석하고자 하였다. 메타버스에 대한 기존 연구는 메타버스의 개념, 활용 방향, 발전 전망, 기술적인 측면에 집중되어 왔다. 하지만 메타버스라는 플랫폼 자체의 특성과 사용자 행태에 대한 연구는 부족한 실정이다. 메타버스가 새로운 콘텐츠로 발전함에 따라 사용자 행태와 콘텐츠 특성에 대한 이해의 중요도 또한 부각되고 있다. 본 연구에서는 메타버스 플랫폼을 이용해 본 경험이 있는 성인 남녀 375명을 대상으로 설문조사를 실시하였다. 무응답을 제외한 350개의 표본을 바탕으로 메타버스 이용 행태가 브랜드 충성도 및 상품 구매 의도에 미치는 영향을 분석하였다. 수집된 데이터는 SPSS 25.0과 SmartPLS 4.0을 사용하여 정제하고 통계적으로 분석하였다. 분석 결과 몰입, 대리만족, 아바타 동일시 등의 이용 행동 요인이 브랜드 충성도 및 브랜드 상품 구매 의도에 긍정적인 영향을 미치는 것으로 나타났다. 이러한 연구 결과는 메타버스의 개념과 발전 방향에 대한 이해를 돕고, 브랜드 마케팅 전략 수립 및 메타버스 관련 사용자 행동 연구 분야에 중요한 기여를 할 것으로 기대된다. This study aims to empirically analyze the usage behavior of metaverses, which have recently attracted attention in various fields. To date, research on metaverses has focused on the concept, direction of utilization, development prospects, and technical aspects. However, there is a lack of research on the characteristics of metaverses and the behavior of users. As the metaverse develops with new content, there is a need to understand user behavior and content characteristics. In this study, we surveyed 375 adult males and females who experienced metaverse, and analyzed the impact of metaverse usage behavior on brand loyalty and item purchase intention based on 350 samples after excluding non-responses. The collected data were cleaned and statistically analyzed using SPSS 25.0 and SmartPLS 4.0. The results showed that the usage behavior factors such as immersion, vicarious satisfaction, and avatar identification have a positive effect on brand loyalty and intention to purchase branded items. These findings help to understand the concept and development direction of metaverse, and are expected to make important contributions to the field of brand marketing strategy formulation and metaverse-related user behavior research.

Rapid synthesis of high-resolution and high unifrom anisotropic hydrogel micropartocles using Degassed micromolding lithography

엄지연,김현웅,임용준,이현지,이낙준,봉기완 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

Replica molding techniques have been developed to enable the mass production of hydrogel particles. However, these techniques synthesize only a narrow range of particle compositions and shapes because of the snag in loading precursors into the micromolds as well as the low particle uniformity due to the uneven evaporation of the precursors. To overcome this limitation, we introduce degassed micromolding lithography which can load precursors within 1 minute irrespective of the wettability. This technique is based on the gas-solubility of a degassed micromold that performs an air absorbing pump to totally fill the mold by drawing precursor liquids in. The semi-closed system within the micromold prevents the uneven evaporation of the precursor.. Furthermore, controlled homogeneousness of the hydrogel microparticles can be accomplished by engineering the design of the micromold array.

저소득층 노인의 복지서비스 이용의향에 관한 연구

엄지연,김려화,황선아,강윤희,신경림 한국간호과학회 2008 한국간호과학회 학술대회 Vol.2008 No.10

저소득 노인계층에 대한 폭염대응대책 연구

엄지연(Eum ji yeon),윤수진(Yun su jin) 한국공간환경학회 2015 공간과 사회 Vol.25 No.4

이 연구는 기후변화로 인한 폭염이 건강에 미치는 영향이 크다는 세계보건기구(2009)의 발표에 따라, 현재의 폭염대응정책이 저소득 노인계층에 효과적으로 도달하고 있는지 알아보고자 했다. 이를 위해 폭염정책의 집행자와 정책대상자를 심층 면담했고, 이를 통해 이 연구는 정책대상자들이 경험하는 정책의 문제점과 한계에 대해 고찰했다는 점에서 기존의 연구와 차별된다. 조사결과 폭염의 예보 및 경보시스템과 현 폭염대응정책의 한계, 정책집행단계에서의 서비스 대상 축소 와 전달체계 선상에서의 관리문제, 무더위쉼터의 심리적 접근성 등이 문제점으로 나타났다. 이러한 문제점들은 현재 지자체 단위에서 이루어지는 단기간의 폭염대응정책상에서 해결 방안을 모색하기는 어렵다. 오히려 사회적 연결망, 주거복지, 독거노인 건강관리 등과 같은 복지 차원에서 폭염대응정책을 포함하는 장기적인 계획을 수립할 필요가 있다. The purpose of this study is to examine the effectiveness of heatwave management plan especially focused on the low-income aged people and suggest policy implications to improve current policy and its implementation. As a research method, a literature review and In-depth interviews were conducted. As a result, policy target group for heatwave management plan has been reduced in implementation and warning or safety call was not delivered effectively within networking system. Moreover cooling center has psychological accessibility problem. This study shows that short-term heatwave management plan has limits to address the vulnerabilities of the low-income aged people. To response these problems, therefore, heatwave management plan needs to be combined with comprehensive welfare policy.