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Azobenzene-Based Dendronized Polymer for Remote-Controllable Actuators
오민택,정광운 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
For the fabrication of remote-controllable actuators, we newly designed and successfully synthesized dendronized polynorbornene (denpol) using azobenzene- based macromonomers. We obtained the denpol (P-3AZ) with narrow polydispersity (PDI) through ring opening metathesis polymerization (ROMP). To analyze the molecular packing structures, the 2D wide angle X-ray diffraction (2D WAXD) was performed and uniaxially oriented P-3AZ film was found to have three different layered structures at various temperatures. When the P-3AZ film was irradiated upon UV light, the film resulted in trans-to-cis isomerization. Irradiation of UV light to the P-3AZ film resulted in bending and the light-emitting diode (LED) colors changed by closing the circuit.
응급실 방문환자 중 낮은 우선순위를 가진 환자의 입원에 영향을 주는 요소
오민택,이성화,박성욱,박순창,김형빈,조영모,배병관,왕일재 대한응급의학회 2018 대한응급의학회지 Vol.29 No.5
Objective: Patients with low acuity who need hospitalization may be at risk if they do not receive proper treatment in overcrowded emergency rooms. This study was conducted to investigate factors affecting the hospitalization of patients with low acuity of Korean Triage and Acuity Scale (KTAS). Methods: This study was a retrospective chart review analysis of patients aged 15 years or older who had triaged as KTAS 4 and 5 grades when visiting a local emergency medical center from January 1, 2016 to December 31, 2017. Multivariate logistic analysis was performed to analyze the effects of age, sex, reasons for visiting, visiting route, ambulance utilization, KTAS grade and major category on patient admission. Results: A total of 10,540 patients were enrolled and the odds ratio (OR) increased with age from those aged over 34 years (P<0.001). Patients that triaged as KTAS grade 5 (adjusted OR, 1.57; 95% confidence interval [CI], 1.36-1.82), had a condition caused by disease (adjusted OR, 2.31; 95% CI, 2.00-2.68), and visited by using an ambulance (public: adjusted OR, 1.05; 95% CI, 0.91-1.22; private: adjusted OR, 4.60; 95% CI, 3.85-5.49) were more likely to be hospitalized. Individuals in the “general” major category were more likely to be hospitalized than those falling into other major categories (P<0.001). Conclusion: The factors influencing the hospitalization of patients with low acuity were age, reasons for visiting, visiting route, ambulance utilization, KTAS grade and major category on patient admission.
Photo-induced Wringing Gel Fabricated from Asymmetric Azobenzene-based Gelator
오민택,정광운 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
For fabrication of wireless switches, an asymmetric azobenzene-based macrogelator (AZ-3BP) is newly designed and successfully synthesized. The phase transitions of AZ-3BP depend on the cooling rate and overlapped phase is separated as the cooling rate increases. The intercalations of alkyl chains crosslinked by intermolecular hydrogen bonding are investigated through wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) experiments. The photo-responsibility of AZ-3BP is investigated by UV light irradiation to the AZ-3BP organogel. Gel-sol transition occurred by squeezing organic solvents due to trans-to-cis isomerization as UV light is exposed. The wringing behavior is resulted from the morphology change from the metastable 3D network to the stable layer structure. This work was supported by the BK21 Plus Program of Korea, Mid-Career Researcher Program (2021R1A2C 2009423).