Click Chemistry-Induced Terminally Crosslinked Poly(ether sulfone) as a Highly Conductive Anion Exchange Membrane Under Humidity Condition

윤다영,임태은,권오중,김태현 한국고분자학회 2019 Macromolecular Research Vol.27 No.10

New terminally crosslinked anion exchange membranes (AEMs) were developed by both thermal and click reaction of piperidinium-functionalized poly(ether sulfone) (PES) multiblock copolymer with both bis(aryl azide) and PEG-functionalized- azide (PEG-azide) as crosslinkers. The structure as well as physicochemical and electrical properties of the corresponding terminally-crosslinked membranes were analyzed and compared with their non-crosslinked counterparts. The hydroxide conductivity of our terminally-crosslinked membranes (especially the PEG-PI-xPES membrane) under room humidity and high-temperature conditions was found to be high because of their unique structures generated by terminal-crosslinking, and hence high water-holding capacity of these crosslinked systems. The amount of bound water was analyzed using both TGA and DSC technqiues to support the enhanced water-holding capacity for our terminally- crosslinked membranes.

이용자 인식조사를 기반으로 한 공공도서관 비대면 서비스 운영 방향에 관한 연구

윤다영,노영희 한국비블리아학회 2021 한국비블리아학회지 Vol.32 No.4

Libraries are experiencing numerous modifications to multifunctional spaces in response to the declaration of WHO pandemic. Most libraries throughout the globe have reported their closures, including national libraries in every country, and most established facing services have been transformed to untact services. However, the breadth of the service varies by local autonomous entity and library, making it difficult for librarians to act according to their conviction, and also users are feeling inconvenienced. As a result, this study used a user perception survey to determine the extent of non-face-to-face services in the library and to suggest the direction of operation of non-face-to-face services in a pandemic condition. To that purpose, beginning February 12, 2020, an online survey of library customers in 37 public libraries was performed for about three weeks, and the 117 replies were examined using the SPSS statistics tool to perform frequency analysis, regression analysis, correlation analysis, and reliability analysis. By the survey and data survey results, it was recommended that library services be re-established in the direction of non-face-to-face library service operation, that library non-face-to-face services be expanded, that user education be conducted, that non-face-to-face services be promoted, and that user opinions be collected. WHO에서 팬데믹을 선포하면서 다중이용시설인 도서관 역시 여러 변화를 맞이하고 있다. 전 세계적으로 각국의 국립도서관을 비롯한 대다수의 도서관이 휴관을 발표하였으며, 기존에 대면하여 제공하던 서비스를 대부분 비대면 서비스로 전환하였다. 하지만 그 서비스의 범위가 지자체 및 도서관별로 상이하여 사서의 소신있는 대응이 어렵고, 이용자 역시 불편을 겪고 있다. 따라서 본 연구에서는 도서관 비대면 서비스의 범위를 파악하고, 이에 대한 이용자의 인식조사를 통해 팬데믹 상황에서 도서관 비대면 서비스 운영 방향을 제안하고자 하였다. 이를 위해 37개의 공공도서관에 도서관 이용자를 대상으로 2020년 2월 12일부터 약 3주간 온라인 설문조사를 진행하였으며, 회수된 117부의 응답지를 SPSS 통계 프로그램을 활용하여 빈도분석, 회귀분석, 상관분석, 신뢰도 분석 등을 실시하였다. 설문결과 및 자료조사 결과를 통해 도서관 비대면 서비스 운영 방향으로 도서관 서비스 재정립, 도서관 비대면 서비스 확대, 이용자 교육 진행, 비대면 서비스에 대한 홍보 진행, 이용자 의견 수렴을 제안하였다.

GC-MS/MS를 이용한 농산물 중 Flometoquin의 시험법 개선

윤다영,배지연,곽혜민,최원조,장귀현,신동우 한국농약과학회 2023 한국농약과학회 학술발표대회 논문집 Vol.2023 No.11

Prevalence and Clinical Characteristics of Metabolically Healthy Obesity in Korean Children and Adolescents: Data from the Korea National Health and Nutrition Examination Survey

윤다영,이영아,이지은,김재현,신충호,양세원 대한의학회 2017 Journal of Korean medical science Vol.32 No.11

Metabolically healthy obesity (MHO) and metabolically unhealthy obesity (MUO) are differentiated by the presence of cardiometabolic risk factors (CMRFs) and insulin resistance (IR). This study aimed to evaluate the prevalence and clinical characteristics of MHO in Korean children and adolescents and to investigate the anthropometric, laboratory, and lifestyle predictors of MHO. This study included data from 530 obese subjects, aged 10–19 years, obtained from the Fourth Korea National Health and Nutrition Examination Survey. Subjects were classified into MHO and MUO groups according to the presence of CMRF (MHOCMRF/MUOCMRF) and degree of IR (MHOIR/MUOIR). Demographic, anthropometric, cardiometabolic, and lifestyle factors were compared between the groups. Logistic regression analysis and receiver operating characteristic curve analysis were performed to identify factors that predicted MHO. The prevalence of MHOCMRF and MHOIR in obese Korean youth was 36.8% (n = 197) and 68.8% (n = 356), respectively. CMRF profiles were significantly less favorable in MUO children. Longer and more vigorous physical activity and less protein intake were associated with MHOCMRF phenotype. The best predictors of MHOCMRF and MHOIR were waist circumference (odds ratio [OR], 0.82; 95% confidence interval [CI], 0.77–0.88; P < 0.001) and body mass index (BMI) standard deviation score (OR, 0.24; 95% CI, 0.15–0.39; P < 0.001), respectively. The prevalence of MHO differed depending on how it was defined. To adequately manage obesity in youth, the approach to individuals with MHO and MUO should be personalized due to variation in clinical characteristics. Longitudinal studies are needed to evaluate long-term consequences of MHO.

X-선 조사 후 고온 열화된 치자 염직물에서 추출한 색소 변이 연구

윤다영,박혜진,박세은,허선홍,임수빈,정용재,Da Young Youn,Hae Jin Park,Se Eun Park,Seon Hong Heo,Su Bin Lim,Yong Jae Chung 한국방사선산업학회 2024 방사선산업학회지 Vol.18 No.1

This study explores the effects of X-ray irradiation for biological control and high-temperature degradation on dye stability in dyed textiles with Gardenia. To evaluate this study, optimal extraction solvents for these textiles were identified by comparing them with a crocin standard solution. Extraction using pyridine closely matched crocin. The study then assessed the stability of X-ray irradiation and high-temperature degradation on these textiles. Transparent yellow dyes were observed in all samples. Color differences were found to increase at higher irradiation doses and longer degradation periods. While UV spectroscopy spectra showed broadening and lowering trends with higher irradiation doses and longer degradation periods, suggesting a reduction in colorant transition, mass spectrometry revealed minimal chemical changes. In conclusion, both X-ray irradiation and high-temperature degradation induced spectral changes without complete dye decomposition. Major colorants were consistently detected.

Study on chemotaxis and chemokinesis of bone marrow-derived mesenchymal stem cells in hydrogel-based 3D microfluidic devices

윤다영,김혜림,이어진,박민희,정석,전호정,안철희,이강원 한국생체재료학회 2016 생체재료학회지 Vol.20 No.3

Background: Controlling the fate of mesenchymal stems cells (MSCs) including proliferation, migration and differentiation has recently been studied by many researchers in the tissue engineering field. Especially, recruitment of stem cells to injury sites is the first and crucial step in tissue regeneration. Although significant progress has been made in the chemotactic migration of MSCs, MSC migration in three dimensional environments remains largely unknown. We developed a 3D hydrogel-based microfluidic-device to study the migration behavior of human MSCs in the presence of stromal-cell derived factor-1α (SDF-1α), interleukin 8 (IL-8) and Substance P (SP) which have been utilized as chemoattractant candidates of human mesenchymal stem cells (hMSCs). Results: We systematically investigated the chemotactic migration behaviors of hMSCs and their responses to SDF-1α, IL-8, and SP. SDF-1α was shown to be the most fascinating chemoattractant candidate among those factors at a certain time point. We also found that each chemokine showed different chemoattractant abilities according to their concentration. In the case of SP, this factor showed chemokinesis not chemotaxis. Especially at a 7–8 × 10−8 M concentration range, the chemokinesis ability driven by SP was further increased. The data suggest that some factors at the optimal concentration exhibit chemokinesis or chemotaxis in a 3D hydrogel-based microfluidic device. Conclusion: In this study on chemotaxis and chemokinesis of hMSCs, the system parameters such as chemokine concentration, system stability, and 2D or 3D microenvironment are critically important to obtain meaningful results.

기억의 조각

윤다영 한국뷰티경영학회 2021 한국뷰티경영학회지 Vol.9 No.2

말단 가교를 도입한 피페리디니움 작용기를 가진 폴리에테르술폰 방향족계 음이온 교환막

윤다영,김태현 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.05

Anion exchange membrane fuel cells (AEMFCs) have been considered as a promising energy device. To make highly efficient AEMs, high ion conductivity, mechanical stabilities and alkaline stabilities are required. High ion conductivity generally accompanies poor mechanical properties, and crosslinking has been widely applied to overcome these problems. Our groups introduced novel terminally-crosslinked piperidinium-functionalized poly(arylene ether sulfone)s as a anion exchange membrane. Unlike the typical AEMs, our terminally-crosslinked membranes are expected to have high conductivity, especially at low RH conditions due to enhanced water-holding capacity, while maintaining the high chemophyscial stabilities by crosslinking. The synthesis, and properties of the prepared membranes will be discussed in detail.

Click chemistry-induced terminally-crosslinked ammonium-functionalized poly(arylene ether sulfone)s as novel anion exchange membranes

윤다영,김태현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

Novel terminally-crosslinked ammonium-functionalized poly(arylene ether sulfone)s have been prepared as novel anion exchange membranes. The copper-mediated click chemistry for the propargyl-terminated PES induced the terminal-crosslinking of this polymer by triazole formation. Unlike the typical AEMs, our terminally-crosslinked membranes showed high conductivity, especially at low RH conditions due to the hydrogen bonding between triazole and water, while maintaining the high chemophyscial stabilities due to crosslinking. The synthesis, and properties of the prepared membranes will be discussed in detail.

컴퓨터 비전을 이용한 이미지 기반 아이 키 측정 애플리케이션 개발

윤다영(Da-Yeong Yun),문미경(Mi-Kyeong Moon) 한국전자통신학회 2021 한국전자통신학회 논문지 Vol.16 No.1

성장 장애 중 저신장증은 빠른 진단과 치료를 통해 호전시킬 수 있는데 이를 위해서는 저신장증의 조기발 견이 중요하다. 저신장증 조기발견 및 아이의 성장 과정 확인을 위해 꾸준히 키를 측정하는 것이 권장되지만 기존의 키 측정방법들에는 시간적·공간적 한계와 비용 발생, 기록유지의 어려움 등의 문제들이 존재한다. 그래서 본 논문에서는 사람들의 접근성이 높은 매체인 스마트폰을 이용하는 ‘컴퓨터 비전을 이용한 이미지 기반 아이 키 측정 애플리케이션 개발’ 방법을 제안하였다. 스마트폰의 카메라를 통해 촬영된 이미지에서 컴퓨터 비전 라이브러리인 OpenCV의 알고리즘들을 이용하여 아이의 키를 측정하고, 그렇게 측정된 키는 성별·나이별 표준 신장과의 비교 그래프, 날짜별 리스트를 통해 화면에 출력함으로써 아이의 성장 과정 확인이 가능하 도록 하였다. 이 제안된 방법을 통해 시간적·공간적 제약 및 비용 발생 없이 언제 어디서든 키를 측정할 수있을 것이라 기대되고, 꾸준한 키 측정과 성장 과정 확인을 통한 저신장증 및 성장 장애의 조기발견에 도움이될 것이라 기대된다. Among growth disorders, ‘Short Stature’ can be improved through rapid diagnosis and treatment, and for that, it is important to detect early‘Short Stature’. It is recommended to measure the height steadily for early detection of ‘Short Stature’ and checking the kid’s growth process, but existing height measurement methods have problems such as time and space limitations, cost occurrence, and difficulty in keeping records. So in this paper, we proposed an ‘Development of Kid Height Measurement Application based on Image using computer vision’ method using smart phones, a medium that is highly accessible to people. In images taken through a smartphone camera, the kid’s height is measured using algorithms from OpenCV, a computer vision library, and the measured heights were printed on the screen through ‘a comparison graph with the standard height by gender and age’ and ‘list by date’, made possible to check the kid’s growth process. It is expected to measure height anytime, anywhere without time and space limitations and costs through this proposed method, and it is expected to help early detection of ‘Short Stature’ and other disorder through steady height measurement and confirmation of growth process.