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Nano Research 2021年第2期14卷 486-492页

作者： Seongsoo kim Seohyeon Jee Kyung Min Choi Dong-sik Shin Division of Chemical and Bioengineering Kangwon National UniversityGangwon-do 24341Republic of Korea Department of Chemical and Biological Engineering Sookmyung Womens University100 Cheongpa-ro 47-gilYongsan-guSeoul 04310Republic of Korea

The challenge for single-atom catalysts in various C-C cross coupling reaction exists in the development of solid supporting *** has been desired tofind a supporting material designed in molecular level to anchor a single-atom catalyst and provide high degree of dispersion and substrate access in aqueous ***,we prepared discrete cages of metal-organic polyhedra anchoring single Pd atom(MOP-BPY(Pd))and successfully performed a Suzuki-Miyaura cross coupling reaction with various substrates in aqueous *** was revealed that each tetrahedral cage of MOP-BPY(Pd)has 4.5 Pd atoms on average and retained its high degree of dispersion up to 3 months in *** coupling efficiencies of the Suzuki-Miyaura cross coupling reaction exhibited more than 90.0%for various substrates we have tested in the aqueous media,which is superior to those of the molecular Pd complex and metal-organic framework(MOF)anchoring Pd ***,MOP-BPY(Pd)was successfully recovered and recycled without performance degradation.

关键词： metal-organic polyhedra Suzuki-Miyaura cross coupling reaction structure characterization aqueous phase reaction high-degree of dispersion

Recent applications of chemosensitivity tests for colorectal cancer treatment

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World Journal of Gastroenterology 2014年第44期20卷 16398-16408页

作者： Yong sik Yoon Jin Cheon kim Department of Surgery University of Ulsan College of Medicine Institute of Innovative Cancer Research and Asan Institute for Life Sciences Asan Medical Center

The evaluation of therapeutic efficacy is necessary to predict the outcome of patients with metastatic colorectal cancer(CRC). In these patients, there is a critical need for predictive chemosensitivity assays and biomarkers to optimize efficacy and minimize toxicity. The introduction of targeted agents has improved the progression-free survival and overall survival of patients with metastatic disease. However, approximately 50% of patients do not show a positive response to chemotherapy and the selection of patients likely to respond to a specific regimen remains challenging. Cell culturebased chemosensitivity tests use autologous viable tumor cells to evaluate susceptibility to specific agents in vitro and predict their direct effects. Adenosine triphosphate-based assays and methyl thiazolyl-diphenyltetrazolium bromide-based assays are used widely as sensitivity tests because of their short assay period, technical simplicity, and the requirement of small amount of specimen. Among protein- and gene-based chemosensitivity assays, assessment of KRAS mutation status predicts the response to epidermal growth factor receptor-targeted therapy in CRC patients. The validation of predictive and prognostic markers enables the selection of therapeutic regimens with optimal efficacy and minimal toxicity for each patient, which has been termed personalized treatment. This review summarizes currently available predictive and prognostic chemosensitivity tests for metastatic CRC.

关键词： Colorectal adenocarcinomas Colorectal cancer Chemotherapy In vitro assays Molecular targeted therapy Individualized therapy

Solvent extraction and stripping of lithium ion from aqueous solution and its application to seawater

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Rare Metals 2016年第12期35卷 948-953页

作者： Gregorius Rionugroho Harvianto Seok-Hyeon kim Chang-sik Ju Department of Chemical Engineering Pukyong National University

For the development of lithium ion recovery process from seawater, a series of experimental researches were performed. Solvent extraction of lithium ion from aqueous solution using kerosene as solvent was proposed. Lithium ion is effectively extracted by thenoyltrifluoroace- tone-trioctylphosphine oxide （TTA-TOPO） in kerosene within 80 min. Extraction efficiency is severely influenced by stoichiometric parameters. Among the stoichiometric parameters, volume ratio of aqueous （A） to extraction （E） solution is the most influential parameter. After extrac- tion, lithium ion could be easily stripped from the extraction solution by acidic solutions. Stripping efficiency decreases with pH of acidic solutions, and the kind of acid does not affect the stripping efficiency. Extraction efficiency main- tains at more than 93 % even when the extraction solution is recycled three times. 65 % of lithium ion can be extracted from seawater by this solvent extraction process when magnesium ion is precipitated by NHaOH prior to solvent extraction process. Other metallic ions in seawater decrease the extraction efficiency of lithium ion.

关键词： Lithium Thenoyltrifluoroacetone Trioctylphosphine oxide Solvent extraction Stripping Recycling

A mass and energy estimation for the hydrogen utilization in the iron-making process

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Science China(Technological Sciences) 2011年第7期54卷 1655-1660页

作者： wan Ho kim Dong Joon MIN Department of Materials Science and Engineering YONSEI University

The possibility of using hydrogen to lower CO 2 emissions in the iron-making process was confirmed by the heat and mass balances in the blast furnace operation. The mass and heat balances for hydrogen utilization in the blast furnace were estimated by using the basic concept of RIST operating diagram. In this study, the RIST operating diagram was modified to be suitable for representing the operation with respect to hydrogen, where the RIST operating diagram is a graphical representation of heat and mass balance in blast furnace operation. RIST operating diagram was applied here to some individual parameters of interest such as H 2 injection in blast furnace process to reduce coke (carbon consumption). It was observed that the point W moved to the right in the RIST operating diagram under the condition of increasing hydrogen injection at tuyere, which originates from the contribution of gas composition (O/H 2 ) equilibrated with Fe/FeO at a certain temperature. Point P also moved downward due to heat requirement with respect to hydrogen utilization, by which the new RIST operating diagram for hydrogen utilization was able to be constructed. Under the condition of hydrogen injection, the expected overall carbon consumption in the blast furnace decreased due to the contribution of hydrogen.

关键词： hydrogen carbon consumption (CO2 emission) mass and heat balances RIST operating diagram blast furnace

Canonical Foliations of Certain Classes of Almost Contact Metric Structures

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Acta Mathematica Sinica,English Series 2005年第4期21卷 841-846页

作者： Tae wan kim Hong Kyung PAK Department of Mathematics Education Silla UniversityPusan617-736.Korea Department of Computer and Information Security Daegu Haany University

The purpose of this paper is to study the canonical foliations of an almost cosymplectic or almost Kenmotsu manifold M in a unified way. We prove that the canonical foliation F defined by the contact distribution is Riemannian and tangentially almost Kahler of codimension 1 and that F is tangentially Kahler if the manifold M is normal. Furthermore, we show that a semi-invariant submanifold N of such a manifold M admits a canonical foliation FN which is defined by the antiinvariant distribution and a canonical cohomology class c（N） generated by a transversal volume form for FN. In addition, we investigate the conditions when the even-dimensional cohomology classes of N are non-trivial. Finally, we compute the Godbillon Vey class for FN.

关键词： Almost α-cosymplectic manifold Almost cosymplectic manifold Almost Kenmotsu manifold Semi-invariant submanifold

Compensation of image noise induced by difference in optical characteristics of array-LED chips of LED print head

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Science China(Technological Sciences) 2017年第12期60卷 1819-1830页

作者： kim wan-Chin PARK Yong-Shik kim Sung-Dae LIM Jiseok Department of Automotive Engineering Honam University Gwansan-gu Gwangju 62399 Korea Mangoslab Co. Ltd. Startupeampus 20 Pangyo-ro 289beon-gil Bundang-gu Seongnam-si Gyeonggi-do 13488 Korea S-Printing Solution Co. Ltd. (Samsung Electronics Ltd) Suwon Gyeonggi-do 443-742 Korea School of Mechanical Engineering Yeungnam University Gyeongsan Gyeongbuk 38541 Korea

There are various applied electro-optical devices, which utilize light emitting didoe(LED) chip array for applications to displays and opto-electronic sensors. In those devices, it is the one of the critical technical issues to minimize uncertain fluctuations including optical power and optical density. Due to variation in operating environment of a device, those are not corrected precisely by controlling parameters based on simple relation between parameters and resultant abovementioned ***, there is essential need to correct outputs in real-time based on correction function generated from the consideration on various operation condition. In this article, we introduce an output correction method through reporting real-time image noise reduction in the application to electro-photography with LED print head. In the technology of LED print head, as differences in optical characteristics between each LED cause vertical image noise, it should be corrected in order to obtain images that are comparable or better in quality compared to those produced by the conventional laser scanning method. Even though it seems that the method used to obtain uniform light power from each LED can solve this problem, it does not work well for high-resolution printing. Therefore, a scan method involving correction by a printed and scanned pattern is introduced through this work. The scan method is composed of correction patterns to minimize printing noise by its shape, the correction algorithm to calculate the optimized value and the printing algorithm to control gray levels in real-time precisely. We believe that the developed correction method upgrades the printing quality of the LPH printer better than commercial printers. The developed correction method can also be applied to various application areas that use an array-type light source such as display systems and lighting systems.

关键词： real-time image correction LED print head(LPH) vertical image noise electro-photography temporal correction spatial correction

Persistent half-metallic ferromagnetism in a(111)-oriented manganite superlattice

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npj Computational Materials 2022年第1期8卷 727-734页

作者： Fabrizio Cossu Heung-sik kim Biplab Sanyal Igor Di Marco Department of Physics and Institute of Quantum Convergence and Technology Kangwon National UniversityChuncheon24341Korea Asia Pacific Center for Theoretical Physics Pohang37673Korea Department of Physics and Astronomy Uppsala UniversityBox 516SE-75120UppsalaSweden Department of Physics POSTECHPohang37673Korea

We employ electronic structure calculations to show that a(111)-oriented(LaMnO_(3))_(12)∣(SrMnO_(3))_(6)superlattice retains a half-metallic ferromagnetic character despite its large *** link this behaviour to the strain and the octahedral connectivity between the *** also gives rise to breathing modes,which are coupled to charge and spin oscillations,whose components have a pure e_(g)*** interestingly,the magnetisation reaches its maximum value inside the LaMnO_(3)region and not at the interface,which is fundamentally different from what observed for the(001)*** inter-atomic exchange coupling shows that the magnetic order arises from the double-exchange mechanism,despite competing interactions inside the SrMnO_(3)***,the van Vleck distortions and the spin oscillations are crucially affected by the variation of Hund’s exchange and charge doping,which allows us to speculate that our system behaves as a Hund’s metal,creating an interesting connection between manganites and nickelates.

关键词： metallic exchange superlattice

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

Soil compression influences the avoidance behavior of Allonychiurus kimi(Collembola)to cadmium and copper

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Pedosphere 2022年第3期32卷 487-494页

作者： Jino SON Yun-sik LEE Yongeun kim Kijong CHO OJeong Eco-Resilience Institute Korea UniversitySeoul 02841(Republic of Korea) Department of Environmental Science and Ecological Engineering Korea UniversitySeoul 02841(Republic of Korea) Institute of Environment and Ecology Korea UniversitySeoul 02841(Republic of Korea)

The behavior of soil organisms inhabiting soil pore spaces can be influenced by soil compression,which can affect their avoidance behavior to *** this study,we aimed to evaluate the effect of soil compression on the avoidance behavior of Allonychiurus kimi(Collembola)to heavy metals cadmium and ***,to assess the applicability of the avoidance test guideline of the International Organization for Standardization(ISO)developed for Folsomia candida,we investigated the avoidance behavior of *** to cadmium and copper in an artificial soil with a loose structure(bulk density of 0.25 g cm^(-3)),the porous texture of which was sufficiently loose to enable *** to move between pore *** effect of soil compression on the avoidance behavior of *** to both metals was evaluated in compressed soil(bulk density of 0.64 g cm^(-3))with a uniformly compressed soil surface,and avoidance behavior was investigated at 24-h intervals over a 120-h *** that *** is unable to burrow into compressed soil,the compressed soil test can minimize the effects of differences in soil factors,such as soil porosity and bulk density,on the behavior of this *** the artificial soil,a statistically significant avoidance behavior of *** was observed at cadmium and copper concentrations greater than 50 and 200 mg kg^(-1),respectively,thereby indicating the applicability of the ISO avoidance test guidelines for *** compared at the same exposure time point,the avoidance response to both metals in compressed soil was less sensitive than that in uncompressed *** addition,we observed differences in the effects of metals on avoidance response in the compressed soil over time,with the effect of cadmium increasing with time and the effect of copper showing the opposite ***,we found that soil compression can affect the avoidance behavior of *** to cadmium and copper,and we discussed the advantages and limitations of using compressed

关键词： behavioral endpoint ecotoxicity test habitat function heavy metal pollutant springtail

Variation in dynamic deformation behavior and resultant yield asymmetry of AZ80 alloy with extrusion temperature

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Journal of Materials Science & Technology 2020年第11期42卷 225-236页

作者： Sang-Hoon kim Sang Won Lee Byoung Gi Moon Ha sik kim Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu702701South Korea Implementation Research Division Korea Institute of Materials ScienceChangwon51508South Korea

In this work,variation in the dynamic recrystallization(DRX)and dynamic precipitation behavior of AZ80 alloy during extrusion due to changes in extrusion temperature was investigated,and the resultant microstructure and yield asymmetry were *** the extrusion temperature increases from 250℃to 350℃,the primary DRX mechanism changes from twin-induced DRX to discontinuous DRX,resulting in an increase in the DRX area fraction and un DRXed grain *** addition,as the extrusion temperature rises,Mg17Al12 precipitation during extrusion decreases sharply throughout the extruded *** reduction in the compressive yield strength(CYS)with increasing extrusion temperature is more pronounced than it is for the tensile yield strength(TYS),which ultimately increases the yield asymmetry of the extruded *** higher extrusion temperature has less of an influence on the TYS due to the promotion of certain hardening *** the other hand,the greater reduction in the CYS is attributed to the increased fraction and size of regions in which{1012}twins predominantly form and the lower amount of precipitates,which effectively facilitates{1012}twinning.

关键词： Magnesium alloys Extrusion Recrystallization Precipitation Yield asymmetry