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Iterative Learning Control of a Reactive Batch Distillation Process
Hyunsoo Ahn,Kwang Soon Lee,Mansuk Kim,Juhyun Lee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Quadratic criterion-based iterative learning control (Q-ILC) was applied to a numerical reactive batch distillation process, in which methacrylic anhydride (MAN) is produced through the reaction of methacrylic acid with acetic anhydride. The role of distillation is to shift the equilibrium conversion toward the direction of the product by removing acetic acid (AcOH), a by-produt of the reaction. Two temperatures at both ends of the column were controlled by individual control loops. A nonlinear PID control manipulating the reflux ratio was employed to regulate the top temperature at the boiling point of AcOH. A constrained Q-ILC was used for the tracking of the reactor temperature. A time-varying reference trajectory for the reactor temperature that maximizes the product yield was obtained through repeated simulations. The Q-ILC achieves satisfactory tracking in several batch runs with mild control movements, while the PID control in compative studies exhibited unacceptable performance.
진단사양 표준화 검증 및 진단프로그램 자동생성 시스템 개발
안현수(Hyunsoo Ahn),김성구(Sunggu Kim),손우혁(Woohyeok Son),이정희(Chunghi Lee),배현철(Hyuncheol Bae) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The main goal of standardization on diagnostic specification is to achieve the reusability of diagnostic program. Reusability is connected with the reliability and cost reduction including delivery time. DIMS was developed to attain these goals through reducing the efforts for standardization verification and coding works. The XML-based database structure and auto-generation method of DIMS enable these features. As a result, through DIMS, the reliable diagnostic program can be obtained cost-efficiently in an early stage.
Storing Digital Information in Long-Read DNA
Ahn, TaeJin,Ban, Hamin,Park, Hyunsoo Korea Genome Organization 2018 Genomics & informatics Vol.16 No.4
There is urgent need for effective and cost-efficient data storage, as the worldwide requirement for data storage is rapidly growing. DNA has introduced a new tool for storing digital information. Recent studies have successfully stored digital information, such as text and gif animation. Previous studies tackled technical hurdles due to errors from DNA synthesis and sequencing. Studies also have focused on a strategy that makes use of 100-150-bp read sizes in both synthesis and sequencing. In this paper, we a suggest novel data encoding/decoding scheme that makes use of long-read DNA (~1,000 bp). This enables accurate recovery of stored digital information with a smaller number of reads than the previous approach. Also, this approach reduces sequencing time.
Ahn, Seyoung,Kim, Ketack,Kim, Hyunsoo,Nam, Sangyong,Eom, Seungwook Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>We prepared La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Co<SUB>1−<I>x</I></SUB>Fe<SUB><I>x</I></SUB>O<SUB>3</SUB> (<I>x</I>=0.1–0.4) catalysts for a zinc air battery by using the citrate method under controlled pH. The prepared precursor powder was heat treated at the calcination temperature of 700 °C and examined for the optimum structure of the cathode. The structure and performance of the catalysts were examined by x-ray diffraction and a scanning electron microscope. The air electrode was prepared by blending the catalyst, Vulcan XC-72R (carbon black), and (polytetrafluoroethylene PTFE) suspension. The oxygen reduction reaction and the oxygen evolution reaction were examined by linear sweep voltammetry. The results showed that La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Co<SUB>0.7</SUB>Fe<SUB>0.3</SUB>O<SUB>3</SUB> (LSCF0.7) is an excellent catalyst for the zinc air secondary battery.</P>
Molecular-Shape-Dependent Luminescent Behavior of Dye Aggregates: Bent versus Linear Benzocoumarins
Moon, Hyunsoo,Xuan, Qui Pham,Kim, Dokyoung,Kim, Yonghwi,Park, Jae Woo,Lee, Chong Han,Kim, Hyeong-Ju,Kawamata, Ayano,Park, Soo Young,Ahn, Kyo Han American Chemical Society 2014 Crystal Growth & Design Vol.14 No.12
<P>Aggregation patterns of dye molecules can govern their photophysical properties in the solid state. The linear and bent shaped dipolar benzocoumarins showed contrasting luminescence behavior in solution and in the solid state. Single crystal structures of both compounds showed π-stacking patterns with eclipsing but opposite dipole moments when viewed orthogonal to the stacking plane. Although the bent molecules are stacked in parallel in the solid state, they behave as independent molecules owing to the unfavorable excited state resonance interaction and hence emit strong fluorescence because each dipolar molecule now is in a hydrophobic environment surrounded by other molecules. This is an unusual example where the shape-dependent stacking governs the solid-state luminescence of dyes, being suggested here as a nonresonant π-stacking system.</P><P>A bent shaped benzocoumarin shows strong luminescence in nanoaggregate and crystalline states despite parallel π-stacking in the solid state, which was explained by unfavorable excited state resonance interactions. This is an unusual example where the shape-dependent stacking governs the solid-state luminescence of dyes, being suggested here as a nonresonant π-stacking system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cgdefu/2014/cgdefu.2014.14.issue-12/cg501567s/production/images/medium/cg-2014-01567s_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cg501567s'>ACS Electronic Supporting Info</A></P>