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전준우,이진영,백지훈,이종찬,김용석,김병각 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Membrane filtration method have been regarded as the most sustainable technology to produce clean water from contaminated water and a tremendous of membranes with different chemical and physical structures have been prepared for water purification. Here, we report the synthesis and characterization of heat treated membranes derived from a carboxylated polymer of intrinsic microporosity (PIM-COOH). The prepared membranes have the same sub-nanosized pore characteristics but they show different chemical composition, carbon to oxygen ratio, with the applied temperature increased. The carbonized PIM-COOH membrane with the highest C/O ratio exhibited the high water flux (4.16 LMH bar-1) and retained good MgSO4 rejection (~82%).
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전준우,이상열,송준오,성태연 한국물리학회 2012 Current Applied Physics Vol.12 No.1
We investigated the electrical properties of Cr(30 nm)/Al(200 nm) contacts to N-polar n-type GaN for high-performance vertical light-emitting diodes and compare them with those of Ti(30 nm)/Al(200 nm) contacts. Before annealing, both the samples show ohmic behaviors with a contact resistivity of 1.9e2.3 × 10-4 Ucm2. Upon annealing at 250 ℃ for 1 min in N2 ambient, the Ti/Al contacts become non-ohmic, while the Cr/Al contacts remain ohmic with a contact resistivity of 1.4 × 103 Ucm2. Based on X-ray photoemission spectroscopy and secondary ion mass spectrometry results,ohmic formation and degradation mechanisms are briefly described and discussed.
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전준우,이규철,맹보미,유영재,김용석,원종찬,허강무,김병각 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In this study, we present first report on carbonization of polymers of intrinsic microporosity(PIM-1). Many different methods such as ultrasonic spray pyrolysis(USP) and spin coating methods were used for preparing various nano-structured PIM-1s. After carbonization at 800~1200°C, all heat-treated PIM-1 had their original shape and their Raman spectra showed D disordered carbon peak at 1330 cm<sup>-1</sup> and G graphitic carbon peak at 1590 cm<sup>-1</sup>. Especially, PIM-1 fabricated by spin coating had properties similar to graphene after carbonization and could be directly used as the transparent electrodes of OSCs, which had a high efficiency of 1.922% transmittance of 63% at 550 nm of wavelength and electrical conductivity of 500 S/cm.
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Cytotoxicity and In vivo Biosafety of the Polylactide Based Bone Composite Materials
전준우,장인규,배진우,서승우,정인권,송윤주,김진환,정동준 한국고분자학회 2017 Macromolecular Research Vol.25 No.6
In this study, we investigated the in vitro cytotoxicity and in vivo biosafety of reinforced polylactide (PLA) composites with hyaluronic acid-chitosan (HACS) complex and β-tricalcium phosphate (β-TCP) powder. The cytotoxicity of HACS/PLA (with β-TCP) composites was almost the same as that of neat PLA indicating that HACS/PLA (with β-TCP) composites did not have toxic effects. In in vivo biosafety tests using X-ray and micro-CT imaging, HACS/PLA (with β-TCP) composites did not show any fracture during 20 weeks of implantation in the tibia and femur of rabbits. The HACS/PLA (with β-TCP) composites did not induce severe inflammatory responses such as recruitment of macrophages around the implantation site, as assessed by H&E and immune staining of biopsy samples, for 6 weeks after insertion into SD rats. Addition of β-TCP powder to HACS/PLA composite enhanced bone induction and regeneration. The HACS/PLA composites prepared in the present study have potential maxillofacial and orthopedic applications.
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2P-81 Preparation of carboxylate functionalized PIMs for gas separation membranes
전준우,김동균,유영재,김용석,이종찬,김병각 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Polymers of intrinsic microporosity (PIMs) have recently gained considerable attention for gas separation membrane, owing to their high surface area and solution processability. Since PIM-1, representative PIMs, have been synthesized, many researchers prepared novel PIMs containing various functionalities such as tetrazole and thioamide and they showed excellent gas separation properties. Several researchers have reported on carboxylate functionalized PIMs but highly carboxylate functionalized and solution-processable PIMs have not been prepared yet. In this work, highly carboxylate functionalized PIMs were prepared by alkaline hydrolysis methods and this reaction process was observed by 1H NMR and FT-IR. The highly carboxylate functionalized PIM membranes exhibits superior gas separation properties for several industrially important gas pairs such as CO<sub>2</sub>/N<sub>2</sub> or O<sub>2</sub>/N<sub>2</sub> pairs.
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전준우 한국도서관정보학회 1976 한국도서관정보학회지 Vol.3 No.-
In Ecorea Lrynasty, the authority all officers a compulsary obligatic.~ to learn the Nyo-I~.'z~\ulcorneruzngd er the custody of a super1 iscr o; Letters wino -1 a\ulcorner the ~ejponsible officer to train ci~ril senants. The Nyo-Kjli ilg was possible to interpret the pious love of ci I illans to the~re lders as a mutual ethics between the parental ber~ec;~lc nce and the filial piety of inferiors which n-as far superior to the traditional cthic; that was laid on an firm obligation of inieri~rs to tEei:- elders. The filial piety as a lovc for elders mean2 a mutual harrn~n:a~n d show\ulcorner a berieiolent conduct as an influence of a political morality. Thc heaer-o!erLt conduct was developed as a political morality of Confucius originated from the filial piety of Confucius based on a moral policj . Such a kenerolent conduct is to become a main spring to effect a mutual tie betn-een the king and his people as a national system of the Confucian theory. In i*<orea Dynasty, the authority had arranged all organizations of the government based on the thought of filial piety since Sung-jong, the King 7, . a pursuing power of bureaucratic system of Confucian theory.
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