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호알칼리성 목질 분해 효소를 이용한 페지 재생(제3보) -페지의 이물질 제거 및 표백-
강석현,이중명,박성배,엄태진 한국펄프종이공학회 2004 펄프.종이기술 Vol.36 No.1
Waste papers(MOW and ONP) were deinked with alkaline cellulolytic enzyme from Coprinus cinereus 2249. The effectiveness of alkaline enzyme on sticky contaminant removal and bleaching of recycling pulp was investigated. The conclusions obtained from the results are as follows. The brightness of deinked pulps MOW and ONP was most high in 0.4IU enzyme treatment. \circled2 The removal effect of sticky contaminant was enhanced with alkaline cellulolytic enzyme treatment. Bleaching with sodium hydrosulfite was most effective in one and two stage bleaching after enzyme treatment of mixed wastepaper of MOW and colored paper. \circled4 The brightness of alkaline enzyme deinked ONP was increased 20% with $H_2O$$_2$ bleaching.
Effect of liquid media on nanoparticles synthesized of nickel oxide by pulsed laser ablation
강석현,Tian Yi Liu,최봉근,여준한,심광보 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.2
Since nano science and technology has been developed at the end of the 20st century, the key technical issues is how to get alarge number of high purity nano materials which were precisely controlled on the morphology, size and structure, andimprove the dispersion and stability of nano materials. Among the numerous methods, laser as an advanced technology hasgot more and more attention. And the introduction of liquid medium makes the laser ablation process become more complex. This work presents the characteristics of nano-sized magnetic material. Focus on the application and preparation of NiOnanoparticles. By using liquid phase pulsed laser ablation method, NiO nanoparticles have been made in different liquidmedia. The comparison of the effect of different liquid medium on composition, size and shape, and process mechanism of thepreparation by this method were discussed. In addition, because of the magnetic properties of the NiO nanoparticles obtained,it can be better applied in many fields. This unique method of liquid phase pulsed laser ablation, is expected to obtain newnano structure and material, show better physical and chemical properties of material.
유전체에 삽입된 자기공진형 무선전력전송 공진기의공진주파수 복원에 관한 연구
강석현,정창원 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.12
본 논문에서는 향후 인체 내장형 의료기기의 무선충전 및 지금까지는 발생하지 않은 다양한 유전체 내부로의 무선전력전송 시 유전체 매질의전자기적 특성에 따른 효율 및공진주파수 변화에 대한 공진기의 최적화 설계를 위해 공진기의정전용량(capacitance)을 조정하는 방법과 공진기의 전후 표면에 공기층(air pocket) 설치 방법을 제안하였다. 본 연구결과는추후 공진기를 둘러싼 다양한 유전체 환경에 대한 공진주파수의 설계 및 복원에 대한 기초 연구 자료로 활용될 수 있다.
강석현,조용남,( P. Santhoshkumar ),조윤철,이창우 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Lithium ion batteries (LIBs) have been widely used in portable electronic device due to their properties such as a high density, long cycle life, no memory effect, environmentally benign nature. As an anode material, titanium dioxide (TiO<sub>2</sub>) has been considerably attracted for LIBs because of its structural stability, abundance, and good cycle life. However, it has a wide bandgap energy of 3.0-3.2 eV, which results in a poor electronic conductivity and rate capability. In this study, we synthesize reduced TiO<sub>2</sub> (TiO<sub>2-x</sub>) using a solvothermal reaction. This material has oxygen vacancy and Ti<sup>3+</sup> that facilitate better electronic conductivity. We prove that the TiO<sub>2-x</sub> material shows the enhanced electrochemical behaviors in LIBs.
P-58 : Optimum Conditions of Hydrogen Separation through Experiment and Simulation of PSA Process
강석현,남기문,정병만,김성현,최대기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
This study performed that optimal conditions of hydrogen separation find through experiment and simulation of PSA process. All experiments and simulations were assumed non-isothermal and non-adiabatic conditions and targeted to parametric analysis of the PSA process variables, such as adsorption time, adsorption pressures, feed rates and P/F ratio. Equilibrium and mass transfer coefficient were calculated LRC isotherm equation and LDF model. Aspen ADSIM (AspenTech. Ltd.) was utilized for the estimation and the simulation of the PSA process cycles. Combined study of the experiments and the mathematical modeling suggested an optimal set of the process conditions to maximize the purity and recovery of the hydrogen product.