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Kang, Taegon,Banquy, Xavier,Heo, Jinhwa,Lim, Chanoong,Lynd, Nathaniel A.,Lundberg, Pontus,Oh, Dongyeop X.,Lee, Han-Koo,Hong, Yong-Ki,Hwang, Dong Soo,Waite, John Herbert,Israelachvili, Jacob N.,Hawker, American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>We describe robustly anchored triblock copolymers that adopt loop conformations on surfaces and endow them with unprecedented lubricating and antifouling properties. The triblocks have two end blocks with catechol-anchoring groups and a looping poly(ethylene oxide) (PEO) midblock. The loops mediate strong steric repulsion between two mica surfaces. When sheared at constant speeds of similar to 2.5 mu m/s, the surfaces exhibit an extremely low friction coefficient of similar to 0.002-0.004 without any signs of damage up to pressures of similar to 2-3 MPa that are close to most biological bearing systems. Moreover, the polymer loops enhance inhibition of cell adhesion and proliferation compared to polymers in the random coil or brush conformations. These results demonstrate that strongly anchored polymer loops are effective for high lubrication and low cell adhesion and represent a promising candidate for the development of specialized high-performance biomedical coatings.</P>
A Novel Marine Bacterium Vibrio sp. Dhg as a Promising Host Strain for Brown Macroalgae Refinery
Dongyeop BAEK,Hyun Gyu LIM,Dong Hun KWAK,Sungwoo PARK,Sunghwa WOO,Jae-Seong YANG,Chae Won KANG,Beomhee KIM,Myung Hyun NOH,Sang Woo SEO,Gyoo Yeol JUNG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Although brown macroalgae holds potential as an alternative feedstock, its utilization by conventional microbial platforms has been limited due to the inability to metabolize one of the principal sugars, alginate. Here, we isolate Vibrio sp. dhg, a fast-growing bacterium that can efficiently assimilate alginate. Based on systematic characterization of the genomic information of Vibrio sp. dhg, we establish a genetic toolbox for its engineering. We also demonstrate its ability to rapidly produce ethanol, 2,3-butanediol, and lycopene from brown macroalgae sugar mixture with high productivities and yields. Collectively, Vibrio sp. dhg can be used as a platform for the efficient conversion of brown macroalgae sugars into diverse value-added biochemicals.
Kang, Taegon,Oh, Dongyeop X.,Heo, Jinhwa,Lee, Han-Koo,Choy, Seunghwan,Hawker, Craig J.,Hwang, Dong Soo American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.44
<P>Mussels survive by strongly attaching to a variety of different surfaces, primarily subsurface rocks composed of metal oxides, through the formation of coordinative interactions driven by protein-based catechol repeating units contained within their adhesive secretions. From a chemistry perspective, catechols are known to form strong and reversible complexes with metal ions or metal oxides, with the binding affinity being dependent on the nature of the metal ion. As a result, catechol binding with metal oxides is reversible and can be broken in the presence of a free metal ion with a higher stability constant. It is proposed to exploit this competitive exchange in the design of a new strategy for the formation, removal, and reformation of surface coatings and self-assembled monolayers (SAM) based on catechols as the adhesive unit. In this study, catechol-functionalized tri(ethylene oxide) (TEO) was synthesized as a removable and recoverable self-assembled monolayer (SAM) for use on oxides surfaces. Attachment and detachment of these catechol derivatives on a variety of surfaces was shown to be reversible and controllable by exploiting the high stability constant of catechol to soluble metal ions, such as Fe(III). This tunable assembly based on catechol binding to metal oxides represents a new concept for reformable coatings with applications in fields ranging from friction/wettability control to biomolecular sensing and antifouling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-44/acsami.5b06910/production/images/medium/am-2015-06910j_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b06910'>ACS Electronic Supporting Info</A></P>
Critical Grain Size of Fine Aggregates in the View of the Rheology of Mortar
Dongyeop Han,Jae Hong Kim,Jin Hyun Lee,Su-Tae Kang 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.4
The aim of this research was to investigate the validity of the Krieger-Dougherty model as a quantitative model to predict the viscosity of mortar depending on various aggregate sizes. The Krieger-Dougherty model reportedly predicted the viscosity of a suspension, which includes cement-based materials. Concrete or mortar incorporates natural resources, such as sand and gravel, referred to as aggregates, which can make up as much as 80% of the mixture by volume. Cement paste is a suspending medium at fresh state and then becomes a binder to link the aggregate after its hydration. Both the viscosity of the suspending medium and the characteristics of the aggregates, therefore, control the viscosity of the cement-based materials. In this research, various sizes and gradations of fine aggregate samples were prepared. Workability and rheological properties were measured using fresh-state mortar samples and incorporating the various-sized fine aggregates. Yield stress and viscosity measurements were obtained by using a rheometer. Based on the packing density of each fine aggregate sample, the viscosity of the mortar was predicted with the Krieger-Dougherty model. In addition, further adjustments were made to determine the water absorption of fine aggregates and was transferred from successful experiment to simulation for more accurate prediction. It was also determined that both yield stress and viscosity increase when the fine aggregate mean size decreases throughout the mix. However, when the mean size of the fine aggregates is bigger than 0.7 mm, the yield stress is not affected by the size of the fine aggregate. Additionally, if aggregate grains get smaller up to 0.3 mm, their water absorption is critical to the rheological behavior.
@@@@@Double-stranded RNA Induction as a Potential Dynamic Biomarker for DNA-demethylating Agents
Minjeong KANG,Kharbash RAISA,Jamin BYUN,Jaemin JEON,Ali AHSAN,Doyeong KU,Jimin YOON,Yongsuk KU,Jooyeon SOHN,Seungjae LEE,Dongyeop SHIN,Youngil KOH,Sungsoo YOON,Junshik HONG,Yoosik KIM 한국생물공학회 2023 한국생물공학회 학술대회 Vol.2023 No.4
Robust Tracking Control of T-S Fuzzy Systems Based on Fuzzy Lyapunov Approach
EuiyoungKim,Dongyeop Kang,Sangchul Won 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper addresses the problem of robust tracking control for nonlinear systems with external disturbances. The nonlinear system is represented by the discrete-time Takagi-Sugeno(T-S) fuzzy model. The controls cheme is based on H∞ performance to attenuate the tracking error as small as possible for the externald is turbances. The stability of the whole closed-loop model is investigate dusing the fuzzy Lyapunov function. Sufficient conditions are derived interms of a set of bilinear matrix inequalities(BMIs). The key point of the proposed approaches is to apply the fuzzy Lyapunov function in the discrete-time robust tracking control problems. The simulation results show the effectiveness of the proposed method.
Detection of Scratch Defects for Wire Rod in Steelmaking Process
Jing Zhang,Dongyeop Kang,Sangchul Won 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents an approach for the surface inspection of steel product. The research aims to detect surface defect of a wire rod. Scratch defect is caused by many reasons such as poor quality of raw material or malfunction of rolling process. The defects are very difficult to detect accurately due to the scale-covered background and uneven illumination. The inspection system is based on vision technology. Image processing algorithms are applied for detecting scratch defects of wire rod. The detection algorithm is mainly divided into three steps. First, wavelet transform is used to obtain the approximation subimage at resolution level one. Then, line segment detection method is applied to detect scratch defects from the images. But the complex backgrounds in images of wire rods inevitably result in false positive and false negative defects. Therefore, additional post-processing methods are applied based on detection results. Compared with previous methods, the proposed method provides the possibility to obtain better results on surface scratch detection.