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SYNTHESIS AND CHARACTERIZATION OF HYDROPHOBIC-HYDROPHILIC MULTIBLOCK COPOLYMERS FOR BIOMEDICAL APPLICATIONS

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Chinese Journal of Polymer Science 1999年第2期17卷 113-122页

作者： Yong Kiel sung Yong Joo kim sung Wan kim Department of Chemistry College of Natural Science Dongguk University 3Ga 26 PhildongJunggu Seoul 100-715 KoreaReliability Technology Division NITQ 2 Chungangdong Kwachoncity Kyunggido 427-010 KoreaCenter for Controlled Chemical Delivery University of Utah Salt Lake City Utah 84112 U. S. A.

The synthesis and characterization of amphiphilic copolymers of poly（dimethyl siloxane）(PDMS),poly（ethylene oxide）(PEO), and heparin（Hep） were investigated. These multiblock copolymers wereidentified using;H-NMR, FTIR, end group analysis, and sulfur elemental analysis. The multiblockcopolymers were characterized by using DSC and X-ray diffractometry. The glass transition temperature,crystalline melting characteristics, annealing effect, and cold crystallization of the block copolymers weredetermined by DSC. The crystallinity of the block copolymers was also determined by X-ray diffractionmethod.

关键词： Heparinized block copolymer Biomedical polymer Synthesis Characterization

Effect of reduction in area per pass on strain distribution and microstructure during caliber rolling in twinning-induced plasticity steel

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Journal of Iron and Steel Research International 2020年第1期27卷 62-74页

作者： Joong-ki Hwang sung Jin kim School of Mechanical Engineering Tongmyong UniversityBusan 48520Republic of Korea Department of Advanced Materials Engineering Sunchon National UniversitySuncheon 57922Republic of Korea

The effects of reduction in area(RA)per pass during caliber rolling on microstructure and strain distribution of twinninginduced plasticity steel have been investigated to find solutions to make a more homogeneous material along the radial direction for wire rod *** steel wires subjected to an average RA per pass of 2.5%(skin pass caliber rolling)and 10.0%(conventional caliber rolling)were *** skin pass caliber-rolled wire was characterized as a duplex fiber texture of majorand minor.and the textures were almost same at/between center and surface area,which is totally different from those of conventional caliber rolling and wire *** skin pass caliber rolling led to more homogeneous microstructure and mechanical properties along the radial direction in comparison with the conventional caliber rolling and wire drawing due to the more homogeneous Hall-Petch hardening,dislocation hardening,and texture behavior with area,resulting in higher formability.

关键词： Twinning-induced plasticity steel Caliber rolling Deformation twin Reduction in area Skin pass

UV-assisted flash light welding process to fabricate silver nanowire/graphene on a PET substrate for transparent electrodes

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Nano Research 2018年第4期11卷 2190-2203页

作者： Wan-Ho Chung sung-Hyeon Park sung-Jun Joo Hak-sung kim Department of Mechanical Engineering Hanyang University 17 Haendang-Dong Seongdong-Gu Seoul 133-791 Republic of Korea Institute of Nano Science and Technology Hanyang University Seou1133-791 Republic of Korea

Graphene oxide and silver nanowires were bar coated onto polyethylene terephthalate （PET） substrates and then welded using an ultraviolet （UV）-assisted flash light irradiation process to achieve both high electrical conductivity and low haze. The irradiation process connected adjacent silver nanowires by welding, while simultaneously reducing the graphene oxide to graphene. This process was performed using a custom W-assisted flash light welding system at room temperature under ambient conditions and was extremely rapid, with processing time of several milliseconds. The effects of varying the weight fractions of the silver nanowires and graphene oxide and of varying the W-assisted flash light welding conditions （light energy and pulse duration） were investigated. The surface morphologies of the welded silver nanowire/graphene films were analyzed using scanning electron microscopy. Optical characterizations, including transmittance and haze measurements, were also conducted using a spectrophotometer. To test their resistance to oxidation, the welded silver nanowire/graphene films were subjected to high temperature in a furnace （100 ℃）, and their sheet resistances were measured every hour. The flash light welding process was found to yield silver nanowire/graphene films with high oxidation resistance, high conductivity （14.35 Ω·sq-1）, high transmittance （93.46%）, and low haze （0.9%）. This material showed uniform temperature distribution when applied as a resistive heating film.

关键词： silver nanowires graphene oxide transparent electrode flash light welding printed electronics

Bright and stable near-infrared perovskite light emitters supported by multifunctional molecule design strategy

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Light(Science & Applications) 2023年第10期12卷 1995-1997页

作者： Joo sung kim Tae-Woo Lee SN Display Co.Ltd. SeoulRepublic of Korea Soft Foundry Seoul National UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSchool of Chemical and Biological EngineeringInstitute of Engineering ResearchSeoul National UniversitySeoulRepublic of Korea

Perovskite light emitters can realize bright,stable and efficient light-emitting diodes through a molecular design strategy that enables strong endurance on high-current operation.

关键词： emitter light diodes

Intestinal microbiota and its interaction to intestinal health in nursery pigs

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Animal Nutrition 2022年第1期8卷 169-184页

作者： Marcos Elias Duarte sung Woo kim Department of Animal Science North Carolina State UniversityRaleighNC27695United States

The intestinal microbiota has gained increased attention from researchers within the swine industry due to its role in promoting intestinal maturation,immune system modulation,and consequently the enhancement of the health and growth performance of the *** review aimed to provide updated scientific information on the interaction among intestinal microbiota,dietary components,and intestinal health of *** small intestine is a key site to evaluate the interaction of the microbiota,diet,and host because it is the main site for digestion and absorption of nutrients and plays an important role within the immune *** diet and its associated components such as feed additives are the main factors affecting the microbial composition and is central in stimulating a beneficial population of *** microbiotaehost interaction modulates the immune system,and,concurrently,the immune system helps to modulate the microbiota *** direct interaction between the microbiota and the host is an indication that the mucosa-associated microbiota can be more effective in evaluating its effect on health *** was demonstrated that the mucosa-associated microbiota should be evaluated when analyzing the interaction among diets,microbiota,and *** addition,supplementation of feed additives aimed to promote the intestinal health of pigs should consider their roles in the modulation of mucosa-associated microbiota as biomarkers to predict the response of growth performance to dietary interventions.

关键词： Intestinal health Mucosa-associated microbiota Nursery pig

Effect of BainiticTreatment on Microstructure and Mechanical Properties of TRIP Cold-Rolled Steel Sheets

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Journal of Iron and Steel Research International 2011年第S1期18卷 1004-1007页

作者： kim sung-joon Korea Institute of Machinery Science Changwon 641010Korea

The effects of bainitic treatment on microstructure and mechanical properties of 0.10C-1.5Mn-l.5Al TRIP-aided cold-rolled steels have been *** samples were heated by intercritical annealing at 820℃for 2 min and quenched in banitic temperature with different hoding time for 5 to 300s,two salt bath were used for the heat *** results show that the yield strength and elongation increase with the increasing of bainitic holding time,while the tensile strength *** volume fraction of retained austenite rise at the beginning of bainitic holding and then reduce,the carbon content of retained austenite increase during the bainitic *** tensile strengthen multiply elongation reaches the highest value at *** mechanical stability of retained austenite fits well with strain hardening during deformation.

关键词： TRIP bainitic treatment microstructure mechanical properties retained austenite

Role of milk carbohydrates in intestinal health of nursery pigs: a review

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Journal of Animal Science and Biotechnology 2022年第3期13卷 628-641页

作者： Ki Beom Jang sung Woo kim Department of Animal Science North Carolina State UniversityRaleighNC 27695USA

Intestinal health is essential for the resistance to enteric diseases and for nutrient digestion and absorption to support *** intestine of nursery pigs are immature and vulnerable to external challenges,which cause negative impacts on the structure and function of the *** nutritional interventions,the benefits of milk are significant for the intestinal health of *** coproducts have traditionally been used in starter feeds to improve the growth of nursery pigs,but their use is somewhat limited due to the high costs and potential risks of excessive lactose on the ***,understanding a proper feeding level of milk carbohydrates is an important start of the feeding *** nursery pigs,lactose is considered a highly digestible energy source compared with plant-based starch,whereas milk oligosaccharides are considered bioactive compounds modulating intestinal immunity and ***,milk carbohydrates,mainly composed of lactose and oligosaccharides,have essential roles in the intestinal development and functions of nursery *** proper feeding levels of lactose in starter feeds could be variable by weaning age,body weight,or genetic *** of lactose and milk oligosaccharides have been broadly studied in human health and animal ***,this review focuses on the mechanisms of lactose and milk oligosaccharides affecting intestinal maturation and functions through modulation of enterocyte proliferation,intestinal immunity,and intestinal microbiota of nursery pigs.

关键词： Intestinal health Lactose Milk carbohydrates Milk oligosaccharides Nursery pig

Fingerprint inspired advanced end-effector and its applications

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Friction 2022年第10期10卷 1739-1750页

作者： sung Ho LEE Hyo sung kim Han Jun PARK Moon Kyu KWAK Department of Electrical Engineering and Computer Science University of MichiganAnn Arbor 48109USA Department of Mechanical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The human fingertip consists of a fingerprint with many micro-grating *** main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the *** this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric *** end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and *** various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MSFE)is characterized by comparing with a macroscale patterned sample(MPS),which has been already used in real industrial *** results are analyzed ***,as feasible applications,we suggest two applications based on the role of the *** is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer *** these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible *** believe that the MSFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.

关键词： fingerprint end-effector fluorocarbon rubber(FKM) glass transfer system spacesuit

Factors associated with axial length elongation in high myopia in adults

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International Journal of Ophthalmology(English edition) 2021年第8期14卷 1231-1236页

作者： Hong Kyu kim sung Soo kim Department of Ophthalmology Dankook University HospitalDankook University College of MedicineCheonan 31116Republic of Korea Yonsei University Graduate School of Medicine Seoul 03722Republic of Korea Department of Ophthalmology Severance HospitalInstitute of Vision ResearchYonsei University College of MedicineSeoul 03722Republic of Korea

AIM:To investigate the association of axial length(AL)and ocular factors on AL ***:A retrospective chart review of patients who underwent two or more AL examinations for more than two *** 4 groups were divided according to initial AL(<24 mm,24-26 mm,26-28 mm,≥28 mm).Initial fundus photograph was used to find risk factors associated AL ***:The mean age of the patients was 47.21±7.79 *** remained almost unchanged in the groups with AL<24 mm and 24≤AL<26 *** the contrary,AL increased by 0.011 mm/y in the group with 26≤AL<28 mm and 0.035 mm/y in the group with AL≥28 mm(P<0.001).In high myopia,AL elongation increased in eye with longer AL(r=0.003,P=0.024),female gender(r=0.014,P=0.019),eye with larger peripapillary chorioretinal atrophic area(r=0.002,P=0.019),and smaller vascular arcade angle(r=-0.004,P=0.006).The risk of elongation 0.03 mm/y in high myopia was increased in female gender(P=0.040),and gradually increased in eye with large peripapillary chorioretinal atrophy area(P<0.01).CONCLUSION:AL elongate significantly in the eye with longer AL,female gender,and the eye with larger atrophic area and smaller arcade angle on fundus photography.

关键词： axial length elongation fundus photography high myopia myopic complication