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Monitoring of Butyltin Compounds Between 1992 and 2009 in Korean Bays
이성언(Seongeon Lee),박천호(Chunho Park),성락규(Rockkyu Sung),이동섭(Dongsup Lee) 한국해양환경·에너지학회 2009 한국해양환경공학회 학술대회논문집 Vol.2009 No.11월
As of 2003, the use of tributyltin (TBT) has been prohibited in Korea. The results of the tests for concentrations of butyltin compounds from this lab in 1992 were compared with those from the same sites in 2006 and 2009. The annual average of each year was used to demonstrate the declining amount of TBT, which dropped from 12.76 ng/L in 1992 to 6.21 ng/L in 2006 and 1.61 ng/L in 2009. The TBT frequency detection was 70% in 1992, 61% in 2006, and 11% in 2009. Therefore, it is the conclusion of the authors that overall TBT use in Korea is declining. Nevertheless, butyltin compounds were still detected at several sites in Koreaat high concentrations. Accordingly, the concentration of butyltin compounds along specific Korean coastal sites needs to be constantly monitored.
Multi-objective Bayesian optimization of chemical reactor design using computational fluid dynamics
Park, Seongeon,Na, Jonggeol,Kim, Minjun,Lee, Jong Min Elsevier 2018 Computers & chemical engineering Vol.119 No.-
<P><B>Abstract</B></P> <P>This study presents a computational fluid dynamics (CFD) based optimal design tool for chemical reactors, in which multi-objective Bayesian optimization (MBO) is utilized to reduce the number of required CFD runs. Detailed methods used to automate the process by connecting CFD with MBO are also proposed. The developed optimizer was applied to minimize the power consumption and maximize the gas holdup in a gas-sparged stirred tank reactor, which has six design variables: the aspect ratio of the tank, the diameter and clearance of each of the two impellers, and the gas sparger. The saturated Pareto front is obtained after 100 iterations. The resulting Pareto front consists of many near-optimal designs with significantly enhanced performances compared to conventional reactors reported in the literature. We anticipate that this design approach can be applied to any process unit design problems that require a large number of CFD simulation runs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Multi-objective Bayesian optimization (MBO) using a CFD chemical reactor model is conducted. </LI> <LI> Automated optimal design procedure of chemical reactors based on CFD is proposed. </LI> <LI> Six design variables of gas-sparged stirred tank reactor are optimized and the saturated Pareto front are obtained within 90 CFD simulations. </LI> <LI> The optimized designs showed significantly enhanced power consumption and gas holdup compared to initial and conventional designs. </LI> </UL> </P>
중추신경계 및 자율신경계 상호 동기화 현상을 이용한 사회지능 수준 추론 모델 개발
박성언(Seongeon Park),이정년(Jung-Nyun Lee),박민지(Min-Ji Park),황민철(Mincheol Whang) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.3
Objective: This study was to determine the levels of social intelligence based on physiological responses in emotional contagion. Background: The social intelligence is an important factor in the understanding of others such as the emotional state, intention, and ideas in the interpersonal relationship. The methods for evaluating social intelligence in previous researches have been shown the limitations of the objectivity and quantification because of the subjective assessment. Method: The participants watched avatars that expressing target emotion through facial expression and gesture. At the same time autonomic nervous system response and central nervous system response were measured. Results: The EEG level was significantly discriminated in positive, negative, empathy, non-empathy, intimacy and non-intimacy emotional contagion situations, and the ECG signals showed significant difference in negative emotion and non-empathy emotional contagion situations. In the case of GSR, there was a difference according to the level of social intelligence only in the non-intimacy emotional contagion state. Conclusion: It was confirmed that the physiological responses of the three groups with different levels of social intelligence are significantly different according to the emotional expression of the avatar. As a result, an objective and immediate social intelligence reasoning model was developed. Application: This study suggests the possibility of quantitative discrimination in social intelligence evaluation and suggests the importance of development of social intelligence evaluation tool.
전산유체역학을 이용한 이산화탄소 광물 탄산화 반응기 분석: 용액 내 고체 반응물 교반 향상을 위한 내부 구조 설계
박성언 ( Seongeon Park ),나종걸 ( Jonggeol Na ),김민준 ( Minjun Kim ),안진주 ( Jinjoo An ),이채희 ( Chaehee Lee ),한종훈 ( Chonghun Han ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.5
산화 칼슘 수용액을 통해 이산화탄소를 포집하는 수성 광물 탄산화 공정은 안정적으로 이산화탄소를 고립시킬 뿐아니라 생성물의 부가 가치를 기대할 수 있는 대표적인 CCU (Carbon Capture & Utilization) 기술이다. 이 공정의 핵심은 고체 반응물인 산화칼슘의 용해 속도를 최대로 높이는 것인데, 이를 위해 반응기 전체에 고체 반응물이 균일하게 분포되도록 혼합하는 적절한 반응기의 설계가 필요하다. 본 논문에서는 하루에 40ton의 이산화탄소 포집이 가능한 파일럿 규모의 광물 탄산화 반응기를 대상으로, 반응기의 내부 구조 설계에 따라 고체 반응물의 분산도가 어떻게 변하는 지에 대해 전산 유체 역학적 모델링(Computational Fluid Dynamics (CFD) modeling)을 통해 연구하였다. 교반 탱크 반응기(stirred tank reactor) 형태를 기반으로 외부 구조는 고정한 상태에서 교반기의 종류/갯수/지름/유격/회전 속도, 칸막이의 높이/너비를 변수로 선정하여 다양한 조합의 경우(case)들을 해석하였다. 각 설계 변수에 대한 민감도를 분석함 으로써 각 변수의 영향을 파악하고, 중요한 변수를 판별할 수 있었다. 동시에 고체 부피 분율(solid volume fraction)의 높이 방향 표준 편차가 0.001에 가까운 균일한 분포를 만들 수 있는 내부 설계안을 제안하였다. Aqueous mineral carbonation process, in which CO2 is captured through the reaction with aqueous calcium oxide (CaO) solution, is one of CCU technology enabling the stable sequestration of CO2 as well as economic value creation from its products. In order to enhance the carbon capture efficiency, it is required to maximize the dissolution rate of solid reactants, CaO. For this purpose, the proper design of a reactor, which can achieve the uniform distribution of solid reactants throughout the whole reactor, is essential. In this paper, the effect of internal reactor designs on the solid dispersion quality is studied by using CFD (computational fluid dynamics) techniques for the pilot-scale reactor which can handle 40 ton of CO2 per day. Various combination cases consisting of different internal design variables, such as types, numbers, diameters, clearances and speed of impellers and length and width of baffles are analyzed for the stirred tank reactor with a fixed tank geometry. By conducting sensitivity analysis, we could distinguish critical variables and their impacts on solid distribution. At the same time, the reactor design which can produce solid distribution profile with a standard deviation value of 0.001 is proposed.
Identification of Derivatives of Cobalt-binding BLM-A2 by NMR
Lee, Seongeon,Shin, Donghyuk,Woo, Sunhee,Won, Hoshik Korean Magnetic Resonance Society 2012 Journal of the Korean Magnetic Resonance Society Vol.16 No.2
Three different derivatives were obtained in the synthesis of cobalt-binding BLM-A2 and characterized by NMR and Mass spectrometry. It was found that Component 1 is Co(II)($2H_2O$)(BLM-A2), component 2 is Co(III)($OOH^-$)(BLM-A2) and component 3 is Co(III)($H_2O$)($OH^-$)(BLM-A2), respectively. Component 2 and 3 were interestingly dominated when CoBLM-A2 complex was synthesized under basic condition. In this experiment, it was revealed newly that the brown form (component 1) was 6-coordinated structure composed with not 5 ligands but 4 ligands from BLM-A2 and with $2H_2O$ as the axial ligands. The component 3 exhibiting a novel ligand configuration is found, and the structure of component 3 was observed to be very similar to that of component 1 in the kind of their ligands but one of the axial ligand is $OH^-$ instead of $H_2O$. These ligand configurations are different from the green form (component 2) exhibiting 6-coordinate structure composed of 5 ligands from BLM-A2 and one ligand of $OOH^-$, being consistent with former studies.
Analysis of butyltin compounds in Crassostrea gigas and Tapes philippinarum on the korean coast
이성언,Lee, Seongeon The Korean Society of Analytical Sciences 2009 분석과학 Vol.22 No.5
Tributyltin (TBT) use has been prohibited by the IMO (International Maritime Organization), as well as Korea, since 2003. This prohibition has affected a gradual reduction in TBT use in maritime environs (seawater, sediment, and biosamples) in several countries. In this study, Crassostrea gigas (oyster) and Tapes philippinarum (manila clam) were chosen and measured for butyltin compound concentrations to verify TBT pollution levels since its 2003 ban. Specimens were taken directly from farms for concentration measurement, where Crassostrea gigas and Tapes philippinarum are cultivated, as well as prevalent locations predicted to have been polluted. Concentrations of MBT, DBT, and TBT of Crassostrea gigas were measured to be N.D -N.D., N.D. -N.D., and N.D. -60.21 ng Sn $g^{-1}$ (wet wt), respectively. Regarding Tapes philippinarum, MBT, DBT, and TBT were N.D. -12.27 ng Sn $g^{-1}$ (wet wt), N.D. -45.95 ng Sn $g^{-1}$ (wet wt), and N.D.-7.30 ng Sn $g^{-1}$ (wet wt), respectively. For this research, a correlative study was conducted to determine butyltin compound concentration in Crassostrea gigas at the locations where measurements were made in 1994 to determine to what extent TBT pollution level decreased. A decrease in all 7 sites was observed. In 4 of the 7 samples, butyltin compounds were measured to be below the detection limit, while that of the Tapes philippinarum did not appear high compared to foreign research data.