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Design of carbon dioxide dehydration process using derivative-free superstructure optimization
An, Jinjoo,Na, Jonggeol,Lee, Ung,Han, Chonghun Elsevier 2018 Chemical engineering research & design Vol.129 No.-
<P><B>Abstract</B></P> <P>A comprehensive optimal design for the CO<SUB>2</SUB> dehydration process created by decomposition-based superstructure optimization is proposed. To reach the most economical process configuration, the superstructure model has been developed including binary interaction parameter regression of the NRTL-RK thermodynamic model, unit operation modeling, and identification of the connectivity of each of the unit operations in the superstructure. The superstructure imbeds 30,720 possible process alternatives and unit operation options. To simplify the optimization problem, the process simulation was explicitly carried out in a sequential process simulator, and the constrained optimization problem was solved externally using a genetic algorithm and an Aspen Plus-MATLAB interface. The optimal process includes a five-stage contactor, a nine-stage still column (with the feed stream entering at the seventh stage), a lean/rich solvent heat exchanger, and a cold rich solvent split flow fed to the first stage of still column. The total annualized cost of the optimum process is 6.70M$/year, which corresponds to the specific annualized cost of 1.88$/t CO<SUB>2</SUB>. As part of the process optimization, a Monte Carlo simulation was performed to analyze the sensitivity of utility cost volatility; the refrigerant and steam present the most influential utility costs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Optimal design of a CO<SUB>2</SUB> dehydration process is proposed using superstructure optimization. </LI> <LI> Binary interaction parameter regression for the NRTL-RK thermodynamic model is performed. </LI> <LI> Optimization problem is solved using a genetic algorithm and Aspen Plus-MATLAB interface. </LI> <LI> The optimal process includes a contactor, still column, lean/rich solvent heat exchanger, and cold rich solvent split flow. </LI> <LI> Sensitivity analysis for utility cost volatility using a Monte Carlo simulation is carried out. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
랜덤화 블록 계획법에서 정렬방법과 선형위치통계량을 이용한 비모수 검정법
한진주,김동재,Han, Jinjoo,Kim, Dongjae 한국통계학회 2016 응용통계연구 Vol.29 No.7
랜덤화 블록 계획법을 검정하는 비모수적 방법에는 일반적인 대립가설에서 Friedman (1937)이 제안한 검정법이 있다. 이 방법은 처리 효과의 차이를 알아보기 위한 검정법으로 블록 내 순위를 사용해 검정함으로써 블록 간 정보의 손실이 있을 수 있다. 본 논문에서는 Hodges와 Lehmann (1962)이 제안한 정렬방법을 이용하여 블록 간 정보 손실을 줄이고, Jo와 Kim (2013)이 제안한 랜덤화 블록 계획법의 결합위치 방법을 확장하여 결합위치에 점수함수를 적용한 새로운 비모수적 방법을 제시하였다. 또한 Monte carlo simulation을 통하여 기존의 검정 방법과 제안한 검정법의 검정력을 비교하였다. Nonparametric procedures in randomized block design was proposed by Friedman (1937) as a general alternative. This method is used to find out the difference in treatment effect. It can cause a loss of inter block information using the ranking in each block. This paper proposed nonparametric procedures using an aligned method proposed by Hodges and Lehmann (1962) to reduce block information based on joint placement suggest by Jo and Kim (2013) in a randomized block design. We also compared the power of the test of the proposed procedures and established method through a Monte Carlo simulation.
Hyeju Choi,Jinjoo Han,강문성,Kihyung Song,고재중 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
We report on the influence of water as an electrolyte on the photovoltaic performances. The photovoltaic performance was shown to be quite sensitive to the substituent on the donor group. An optimized efficiency of 4.41% in the presence of 100% water content using I−/I3 − redox couple was obtained using the D21L6 organic dye.
Choi, Hyeju,Han, Jinjoo,Kang, Moon-Sung,Song, Kihyung,Ko, Jaejung Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
We report on the influence of water as an electrolyte on the photovoltaic performances. The photovoltaic performance was shown to be quite sensitive to the substituent on the donor group. An optimized efficiency of 4.41% in the presence of 100% water content using $I^-/I{_3}^-$ redox couple was obtained using the D21L6 organic dye.