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Lee, Jinhee,Lee, Byungyong,Park, Jeyoung,Oh, Jaehoon,Kim, Taehyoung,Seo, Myungeun,Kim, Sang Youl Elsevier 2018 Polymer Vol.153 No.-
<P><B>Abstract</B></P> <P>A series of well-defined poly(arylene ether sulfone)s (PESs) as a rod-type block was synthesized by chain-growth condensation polymerization from a diphenyl sulfone-type initiator containing a fluorine leaving group and an allyl moiety. Interestingly, these oligomeric PESs exhibited lower critical solution temperature (LCST)-type phase transition behavior in organic solvents, i.e., 1,2-dimethoxyethane (DME) and chloroform. The clouding point temperature was affected by the molecular weight and concentration of the polymers. The cloud temperature decreased as the molecular weight polymers and the concentration of polymer solution increased. And also two series of rod-coil type poly(arylene ether sulfone)-<I>b</I>-polylactides were synthesized by controlled ring-opening esterification polymerization of <SMALL>DL</SMALL>-lactide with a PES-derived macroinitiator in which the allyl group was transformed into an aliphatic hydroxyl group by a thiol-ene click reaction. These diblock copolymers also exhibited LCST behavior in DME, and the nanoscale size of the aggregates increased upon heating.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Well-controlled rod-type poly(ethersulfone)s were synthesized. </LI> <LI> The poly(ethersulfone)s exhibited thermos-responsive properties in organic solvents. </LI> <LI> This phase transition behavior was also observed with diblock copolymers. </LI> <LI> Their cloud points were affected by the molecular weight and the concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hoang, Nhung T. T.,Lee, Jinhee,Lee, Byungyong,Kim, Hae-Young,Lee, Jungeun,Nguyen, Truc Ly,Seo, Myungeun,Kim, Sang Youl,Kim, Byung-Kwon American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.12
<P>Herein, a study on a new lower critical solution temperature (LCST) polymer in an organic solvent by an electrochemical technique has been reported. The phase-transition behavior of poly(arylene ether sulfone) (PAES) was examined on 1,2-dimethoxyethane (DME). At a temperature above the LCST point, polymer molecules aggregated to create polymer droplets. These droplets subsequently collided with an ultramicroelectrode (UME), resulting in a new form of staircase current decrease. The experimental collision frequency and collision signal were analyzed in relation to the concentration of the polymer. In addition, the degree of polymer aggregation associated with temperature change was also observed.</P> [FIG OMISSION]</BR>
Molten Steel Level Controller Based on Disturbance Observer with Time-delay Compensation
Kim, Minsung,Moon, Sungwoong,Na, Changheum,You, Byungyong,Kueon, Yeongsub,Lee, Dukman,Lee, Jookang,Lee, Jin S. The Iron and Steel Institute of Japan 2011 ISIJ international Vol.51 No.2
<P>Regulating molten steel level in continuous casting is difficult, because it suffers from various disturbances, among which the bulging disturbance is the most prominent. Moreover, as the casting speed increases in continuous casting, the phase lag due to the system delay increases. In this paper, we propose a disturbance observer with time-delay compensation to eliminate the bulging disturbance in the presence of system delay. We tested the proposed method using a 1 : 1 scale hardware simulator and confirmed that the method successfully decreased the bulging disturbance effect from the molten steel level.</P>
Genetic Analysis of Kallikrein-Kinin System in the Korean Hypertensives
Kang, ByungYong,Bae, Joon Seol,Lee, Kang Oh The Korean Society for Integrative Biology 2004 Korean journal of biological sciences Vol.8 No.1
The kallikrein-kinin system affects regulation of blood pressure, and genes encoding for the components of this system have been considered as good candidates for hypertension. To evaluate the relationship between genetic polymorphisms of candidate genes involved in this system and hypertension, we performed case-control studies using genetic markers in Korean normotensives and hypertensives, respectively. By association study, there was a marginal association with hypertension in AA genotype distribution of A1789G polymorphism in the hKLK1 gene (P=0.0754). Thus, this genetic polymorphism may weakly contribute to the susceptibility to hypertension in Koreans. We also observed that significant linkage disequilibrium exists among three polymorphic sites in the hKLK1 gene studied, suggesting that the three genetic polymorph isms can be useful as genetic markers in clinical association studies. Further studies using larger sample sizes and more genetic markers will be needed to clarify genetic influence of kallikrein-kinin system for hypertension.