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프러시안 블루 (PB)의 방사성 세슘 흡착 메커니즘 연구
장성찬,김준영,허윤석,노창현 한국방사선산업학회 2015 방사선산업학회지 Vol.9 No.3
Since the accident at the Fukushima Daiichi power plant, Prussian blue (PB) hasattracted increasing attention as a material for use in decontaminating the environment. Wehave focused the fundamental mechanism of specific Cs+ adsorption into PB in order to develophigh-performance PB-based Cs+ adsorbents. The ability of PB to adsorb Cs varies considerablyaccording to its origin such as what synthesis method was used, and under what conditions the PBwas prepared. It has been commonly accepted that the exclusive abilities of PB to adsorb hydratedCs+ ions are caused by regular lattice spaces surrounded by cyanido-bridged metals. Cs+ ions aretrapped by simple physical adsorption in the regular lattice spaces of PB. Cs+ ions are exclusivelytrapped by chemical adsorption via the hydrophilic lattice defect sites with proton-exchange fromthe coordination water. Prussian blue are believed to hold great promise for the clean-up of 137Cscontaminated water around nuclear facilities and/or after nuclear accidents.
장성찬,강성민,이일송,노창현,허윤석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Radioactive contaminant adsorbents require well-designed morphologies for effective interaction with radioactive species selectively and high structural stability during adsorption. Herein, we demonstrate a pomegranate-like micro-scavenger cage (P-MSC) with high adsorption capacity towards radioactive cesium (<sup>137</sup>Cs). The resulting micro-scavenger cage shows enhancing properties compared to alginate bead gelled by traditional methods using Ca<sup>2+</sup>. The proton-exchange between cesium and P-MSC result in rapid adsorption, within 10 min, with a high removal capacity. The resulting P-MSC has a 236-fold higher distribution coefficient toward cesium than traditional Ca-alginate bead. The maximum cesium removal capacity of the P-MSC is 108.06 mg/g. It is found that the P-MSC have a removal efficiency of 99.24% for radioactive cesium, showing that the material holds great promise for the clean-up of radioactive cesium contaminated seawater around nuclear plants and/or after nuclear accidents.
민간항공 부기장 팔로워십 유형에 따른 CRM의 리더십 및 팀워크 스킬 역량 비교
장성찬,이장룡 (사)위기관리이론과실천 2023 Crisisonomy Vol.19 No.11
It has been observed that approximately 70% of aviation accidents are closely linked to human factors within the cockpit crew. To address this critical issue, the aviation industry has implemented CRM as an operational frameork. For the effective execution of CRM, it is vital for pilots to possess 5 non-technical skills. Among these, leadership and teamwork skills are crucial components, and it is not solely reliant on the captain's leadership but also influenced significantly by the quality of followership. Followership can be classified into various types, including pragmatic and exemplary followership, among others. This research hypothesized that these different followership types would have varying impacts on leadership and teamwork skill competency. The experimental results confirmed that the pragmatic followership was more conductive to enhancing leadership and teamwork skill competency compared to the exemplary followership. Furthermore, it was identified that pragmatic followership exhibited a slight tendency towards higher communication skill competencies in comparison to the exemplary followership.
장성찬,권영준,채수빈,최원석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We report on the electromagnetic interference shielding behavior of MWCNT/Carbon black/Graphite nanocomposites fabricated by the rotate milling process to demonstrate the contribution of the process to shielding properties. The carbon hybrid composites showed excellent shielding response, which is majorly governed by absorption losses. The results show that the total EMI shielding effectiveness (SE) value is 32 dB at 0.3~1.5 GHz for carbon hybrid composites at 20 um thickness, dominated by absorption mechanism, which overpowered the 10 dB value of graphene oxide. The presence of carbon materials enhances space charge polarization, multiple scattering and effective anisotropy energies of the carbon hybrid composites, resulting in high electromagnetic shielding effectiveness. The dielectric behavior was evaluated to correlate with the EMI shielding mechanism.