http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임현태,유호균,하유미,김윤호,원종찬,김진수 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
OCR (Optical Clear Resin) materials are a transparent resins that are filled between the touch panel and the display. Acrylic resins not only cure quickly by UV irradiation, but also have advantages such as excellent transparency, eco-friendliness, and low cost. In this study, we synthesized and characterized an imide-based urethane acrylate (imide-UAO) derived from cycloaliphatic dianhydrides. Thereafter, a UV-curable imide-modified urethane acrylate resin composite was prepared by combining the newly synthesized imide-UAO, reactive monomer, and photoinitiator. In addition, the optical properties (yellow index, haze, and transmittance) and adhesive properties of UV-cured composites were investigated to confirm their potential as OCR materials.
임현태,이선우,장영욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Light-triggered shape memory polymers are relatively new kind of smart materials having diverse technological applications. In this study, polycaprolatone(PCL) was synthesized by surface initiated ringopening polymerization of ε-caprolactone in the presence of polydopamine (PDA) nanoparticle with a size of approximately 200 nm. Then, terminal hydroxyl group of PCL grafted onto the PDA nanoparticles were converted to acrylate group via the reaction with 2-isocyanatoethyl acrylate. PCL networks containing PDA nanoparticles were prepared by UV-initiated thiol-acrylate reaction. The UV cured network exhibit shape memory effect on exposure to near-infrared (NIR) light, indicating that the PDA nanoparticles acted as NIR-triggered nanoheaters. Thermomechanical properties of the networks with different content of PDA as well as type of multi-thiol compounds were also examined by tensile testing, DMA and DSC.
Optimized TOF-PET detector using scintillation crystal array for brain imaging
임현태,최용,정지웅,박건태,김연경,정진호 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7
Research groups in the field of PET instrumentation are studying time-of-flight(TOF) technology to improve the signal-to-noise ratio of PET images. Scintillation light transport and collection plays an important role in improving the coincidence resolving time(CRT) of PET detector based on a pixelated crystal array. Four crystal arrays were designed by the different optical reflection configuration such as external reflectors and surface treatment on the CRT and compared with the light output, energy resolution and CRT. The design proposed in the study was composed of 8 8 LYSO crystal array consisted of 3 3 15 mm3 pixels. The entrance side was roughened while the other five surfaces were polished. Four sides of all crystal pixels were wrapped with ESR-film, and the entrance surface was covered by Teflon-tape. The design provided an excellent timing resolution of 210 ps and improved the CRT by 16% compared to the conventional method using a polishing treatment and ESR-film. This study provided a method for improving the light output and CRT of a pixelated scintillation crystal-based brain TOF PET detector. The proposed configuration might be an attractive detector design for TOF brain PET requiring fast timing performance with high cost-effectiveness