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Characterization of standard embeddings between complex Grassmannians by means of varieties of minimal rational tangents

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Science China Mathematics 2008年第4期51卷 660-684页

作者： mok Ngaiming Department of Mathematics The University of Hong Kong

In 1993, Tsai proved that a proper holomorphic mapping f: Ω → Ω′ from an irreducible bounded symmetric domain Ω of rank ? 2 into a bounded symmetric domain Ω′ is necessarily totally geodesic provided that r′:= rank(Ωg’) ? rank(Ω):= r, proving a conj.cture of the author’s motivated by Hermitian metric rigidity. As a first step in the proof, Tsai showed that df preserves almost everywhere the set of tangent vectors of rank 1. Identifying bounded symmetric domains as open subsets of their compact duals by means of the Borel embedding, this means that the germ of f at a general point preserves the varieties of minimal rational tangents (VMRTs).In another completely different direction Hwang-mok established with very few exceptions the Cartan-Fubini extension priniciple for germs of local biholomorphisms between Fano manifolds of Picard number 1, showing that the germ of map extends to a global biholomorphism provided that it preserves VMRTs. We propose to isolate the problem of characterization of special holomorphic embeddings between Fano manifolds of Picard number 1, especially in the case of classical manifolds such as rational homogeneous spaces of Picard number 1, by a non-equidimensional analogue of the Cartan-Fubini extension principle. As an illustration we show along this line that standard embeddings between complex Grassmann manifolds of rank ? 2 can be characterized by the VMRT-preserving property and a non-degeneracy condition, giving a new proof of a result of Neretin’s which on the one hand paves the way for far-reaching generalizations to the context of rational homogeneous spaces and more generally Fano manifolds of Picard number 1, on the other hand should be applicable to the study of proper holomorphic mappings between bounded domains carrying some form of geometric structures.

关键词： minimal rational curves varieties of minimal rational tangents analytic continuation rigidity bounded symmetric domains proper holomorphic maps 14j.5 32M15 32H35 53C10

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丙型肝炎母婴传播何时发生

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世界核心医学期刊文摘（儿科学分册） 2005年第8期1卷 18-18页

作者： mok j. Pembrey L. Tovo P.- A. Newell M.- L. 朱新菊 Ctr. Paediatr. Epidemiol./Biostat. Institute of Child Health University College London 30 Guilford Street London WC1N 1EH United Kingdom Prof.

Obj.ctive: To investigate when hepatitis C virus (HCV) infection from mother to child occurs, and evaluate possible associafed factors. Design: Prospective c ohort study. Patients: Fifty four HCV infected children tested within three days of birth and their mothers. Main outcome measures: HCV RNA polymerase chain rea ction (PCR) results. Results: Seventeen of the children (31% , 95% confidence interval 19% to 46% )- were positive in the first 3 days of life and could be assumed to have acquired infection in utero. Testing PCR positive was not ass ociated with sex (53% v 49% boys; p = 0.77) or mode of delivery (29% elect ive caesarean section in both groups; p = 0.98). Children with evidence of intra uterine infection were significantly more likely to be of lower birthweight and infected with genotype 1 (58% v 12% , p = 0.01). Although a higher proportion of infants born to HCV/HIV co- infected women were PCR positive in the first 3 days of life, this difference did not reach statistical significance; excluding infants born to co- infected women did not affect the results. Thirty seven of the children (68% ) were negative in the first 3 days of life, 27 of whom were positive when tested again at 3 months, and nine were first PCR positive after 3 months (one child had no further tests). Conclusions: These results suggest th at at least one third and up to a half of infected children acquired infection i n utero. Although postpartum transmission cannot be excluded, these data suggest that it is rare. The role of HCV genotypes in the timing and mechanism of infec tion should be explored further.

关键词：母婴传播丙型肝炎宫内感染婴儿出生体重定群研究丙肝病毒出生后多聚酶链反应病毒感染混合感染

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Versatile control of concentration gradients in non-fullerene acceptor-based bulk heteroj.nction films using solvent rinse treatments

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Green Energy & Environment 2022年第5期7卷 1102-1110页

作者： Chang-mok Oh Soyeong j.ng j.hoon Lee Sung Heum Park In-Wook Hwang Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea Department of Physics Pukyong National UniversityBusan48513Republic of Korea

Solvent rinse treatments using polar methanol(Me OH)and nonpolar n-hexane have been developed for controlling material concentration gradients along the longitudinal direction of non-fullerene acceptor-based bulk heteroj.nction(BHj.films comprised of electron donor polymer,PBDB-T and acceptor,*** the used solvents(chlorobenzene with 1 vol%DIO)were completely evaporated,ITIC-m rich domains were formed at the top surface of the BHj.films after they were rinsed with Me OH,as evidenced by water contact angle,atomic force microscopy,time-of-flight secondary ion mass spectroscopy,which led to enhanced electron transport in the conventional structure of organic solar cells(OSCs).In contrast,after rinsing with n-hexane,ITIC-m rich domains were formed at the bottom surface of the films,which improved electron transport in the inverted structure *** enhanced carrier transports increased the PCEs(11.80%and 11.15%)in both conventional and inverted OSCs by 10.29%and 10.35%compared with control *** versatile control of material concentration gradients is determined to be feasible owing to the chemical interaction of the used substrates(glass,PEDOT:PSS,and Zn O)and rinsing solvents.

关键词： films treatment heteroj.nction

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Degradation of Synthetic Dyeing Wastewater by Underwater Electrical Discharge Processes

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Plasma Science and Technology 2013年第7期15卷 659-665页

作者： S.D.KIM D.I.j.NG B.j.LIM S.B.LEE Y.S.mok Yeongsan River Environment Research Center National Institute of Environmental ResearchGwangju 500-480 Korea Department of Chemical and Biological Engineering Jeju National UniversityJeju 690-756 Korea

Electrical discharge treatments of synthetic dyeing wastewater were carried out with two different systems： underwater pulsed electrical discharge （UPED） and underwater dielectric barrier discharge （UDBD）. Reactive Blue 4 （RB4） and Acid Red 4 （AR4） were used as model contaminants for the synthetic wastewater. The performance of the aforementioned systems was compared with respect to the chromaticity removal and the energy requirement. The results showed that the present electrical discharge systems were very effective for degradation of the dyes. The dependences of the dye degradation rate on treatment time, initial dye concentration, electrical energy, and the type of working gas including air, 02, and N2 were examined. The change in the initial dye concentration did not largely affect the degradation of either RB4 or AR4. The energy delivered to the UPED system was only partially utilized for generating reactive species capable of degrading the dyes, leading to higher energy requirement than the UDBD system. Among the working gases, the best performance was observed with O2. As the degradation proceeded, the concentration of total dissolved solids and the solution conductivity kept increasing while pH showed a decreasing trend, revealing that the dyes were effectively mineralized.

关键词： degradation dyeing wastewater pulsed electrical discharge dielectric barrierdischarge

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Application of Integrated Database to the Casting Design

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j.urnal of Materials Science & Technology 2008年第3期24卷 351-355页

作者： In-Sung Cho Seung-mok Yoo Chae-Ho Lim j.ong-Kil Choi KITECH 7-47 Songdo-dongYeonsu-gu

Construction of integrated database including casting shapes with their casting design, technical knowledge, and thermophysical properties of the casting alloys were introduced in the present study. Recognition tech- nique for casting design by industrial computer tomography was used for the construction of shape database. Technical knowledge of the casting processes such as ferrous and non-ferrous alloys and their manufacturing process of the castings were accumulated and the search engine for the knowledge was developed. Database of thermophysical properties of the casting alloys were obtained via the experimental study, and the properties were used for the in-house computer simulation of casting process. The databases were linked with intelligent casting expert system developed in center for e-design, KITECH. It is expected that the databases can help non casting experts to devise the casting and its process. Various examples of the application by using the databases were shown in the present study.

关键词： Integrated database Casting design Shape recognition

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Effect of hydrogen fluoride and magnesium oxide on AZ31 Mg alloy/carbon fiber-reinforced plastic composite by thermal laser j.ining technique

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j.urnal of Magnesium and Alloys 2024年第7期12卷 2874-2889页

作者： Andrews Nsiah Ashong Barton Mensah Arkhurst Youn Seoung Lee mok-Young Lee j.oung Han Kim School of Materials Science&Engineering University of New South Wales SydneyNSW2052Australia Department of Information and Communication Engineering Hanbat National UniversityYuseong-guDaejeonSouth Korea Welding&j.ining research group steel solution research laboratoryPOSCOIncheonRepublic of Korea Department of Materials Science&Engineering Hanbat National UniversityYuseong-guDaejeonSouth Korea

Although hydrofluoric acid(HF)surface treatment is known to enhance the j.ining of metals with polymers,there is limited information on its effect on the j.ining of AZ31 alloy and carbon-fiber-reinforced plastics(CFRPs)through laser-assisted metal and plastic direct j.ining(LAMP).This study uses the LAMP technique to produce AZ31-CFRP *** j.ining process involves as-received AZ31,HFpretreated AZ31,and thermally oxidized HF-pretreated AZ31 alloy ***,the bonding strength of j.ints prepared with thermally oxidized AZ31 alloy sheets is examined to ascertain the combined effect of HF treatment and thermal oxidation on bonding *** microstructures,surface chemical interactions,and mechanical performances of j.ints are investigated under tensile shear *** factors,such as bubble formation,CFRP resin decomposition,and mechanical interlocking considerably affect j.int ***,surface chemical interactions between the active species on metal parts and the polar amide along with carbonyl groups of polymer play a significant role in improving j.int *** prepared with surface-pretreated AZ31 alloy sheets show significant improvements in bonding strength.

关键词： Thermal laser j.ining Thermal oxidation Hydrofluoric acid pretreatment Mechanical interlocking Covalent bonds Chemical interactions

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Regeneration of C_4H_(10) dry reforming catalyst by nonthermal plasma

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j.urnal of Energy Chemistry 2013年第3期22卷 394-402页

作者： Y.S.mok E.j.a Y.j.Hyun Department of Chemical and Biological Engineering Jeju National UniversityJeju 690-756Republic of Korea Korea Institute of Energy Research Jeju 699-903Republic of Korea

Carbon deposition via coke formation is one of the critical problems causing catalyst deactivation during the reforming of hydrocarbons. An effort was made to regenerate the catalyst （Ni/γ-alumina） by oxidation methods. Two approaches were carded out for the regeneration of the deactivated catalyst. The first one involves the plasma treatment of the deactivated catalyst in the presence of dry air over a temperature range of 300-500℃, while the second one only the thermal treatment in the same temperature range. The performance of the regenerated catalyst was evaluated in terms of C4H10 and CO2 conversions and the physicochemical characteristics were examined using a surface area analyzer, an elemental analyzer, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. It was observed that the carbon deposit （coke） on the catalyst was about 9.89 wt% after reforming C4H10 for 5 h at 540℃. The simple thermal treatment at 400 ℃ reduced carbon content to 6.59 wt% whereas it was decreased to 3.25 wt% by the plasma and heat combination. The specific surface area was fully restored to the original state by the plasma-assisted regeneration at 500℃. As far as the catalytic activity is concerned, the fresh and regenerated catalysts exhibited similar C4H10 and CO2 conversion efficiencies.

关键词： dry reforming coke formation regeneration plasma catalyst

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Preparation and characterization of poly(propylene glycol)-conj.gated cationic polymers for efficient gene delivery

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Asian j.urnal of Pharmaceutical Sciences 2016年第1期11卷 170-171页

作者： Gyeonghui Yu Minj. Kang Hyej.ng mok Department of Bioscience and Biotechnology Konkuk University

Nucleic acid drugs are desirable therapeutics for the treatment of fatal diseases like *** clinical translation of nucleic acid drugs,carrier systems that protect nucleic acid from degradation and help cellular uptake are *** cationic polymers are used as a carrier due to their strong electrostatic interaction with nucleic acids,which produce nanosized particles[1].

关键词： Branched polyethylenimine Micelle Thermosensitive ε-Poly-L-Lysine(ε-PLL)

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Studies on Nitrogen Oxides Removal Using Plasma Assisted Catalytic Reactor

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Plasma Science and Technology 2003年第6期5卷 2057-2062页

作者： V.Ravi Young Sun mok B.S.Raj.nikanth Ho-Chul Kang Department of High Voltage Engineering Indian Institute of Science Bangalore-560 012IndiaDepartment of Chemical EngineeringCheju National UniversityAraCheju 690-756South KoreaDepartment of High Voltage EngineeringIndian Institute of Science Bangalore-560 012IndiaDepartment of Chemical EngineeringCheju National UniversityAraCheju 690-756South Korea

An electric discharge plasma reactor combined with a catalytic reactor wasstudied for removing nitrogen oxides. To understand the combined process thoroughly, dischargeplasma and catalytic process were separately studied first, and then the two processes were combinedfor the study. The plasma reactor was able to oxidize NO to NO_2 well although the oxidation ratedecreased with temperature. The plasma reactor alone did not reduce the NO_x (NO+NO_2) leveleffectively, but the increase in the ratio of NO_2 to NO as a result of plasma discharge led to theenhancement of NO_x removal efficiency even at lower temperatures over the catalyst surface(V_2O_5-WO_3/TiO_2). At a gas temperature of 100℃, the NO_x removal efficiency obtained using thecombined plasma catalytic process was 88% for an energy input of 36 eV/molecule or 30 j.l.

关键词： non-thermal plasma catalytic process oxidation NO_x removal

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Elucidating the evolution of long-period stacking ordered phase and its effect on deformation behavior in the as-cast Mg-6Gd-1Zn-0.6Zr alloy

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j.urnal of Magnesium and Alloys 2023年第8期11卷 2801-2810页

作者： Sangwon Lee Yej.n Park j.ngbin Go Young mok Kim Seok Su Sohn j.ehua Li Pyuck-Pa Choi Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Department of Materials Science and Engineering Kyoto UniversityKyoto606-8501Japan Department of Materials Science and Engineering Korea UniversitySeoul02841Republic of Korea Institute of Casting Research Montanuniverstät LeobenLeobenA-8700Austria

Herein,the evolution of long-period stacking ordered(LPSO)phases in the as-cast Mg-6Gd-1Zn-0.6Zr(wt.%)alloy are investigated via transmission electron microscopy(TEM)and atom probe tomography(APT).The TEM results reveal that two types of LPSO phase(a bulky interdendritic phase and a plate-like matrix LPSO phase)are formed in the as-cast *** of the LPSO phases are confirmed to be of the 14H type,with a smaller proportion being of the 18R ***,the APT results reveal that the composition of the interdendritic LPSO phase is closer to that of the ideal 14H phase compared to the matrix LPSO phase,and both the interdendritic and matrix LPSO phases exhibit a Gd/Zn ratio of 2.5,thereby indicating a deficient Zn content compared to the ideal 14H phase(i.e.,1.3).In addition,the influence of the LPSO phases on the deformation behavior is investigated at different compressive plastic strains using electron backscatter diffraction(EBSD)analysis to reveal twinning and slip behavior during *** results indicate that the LPSO phase induces additional work hardening in the late stage of deformation via the suppression of{1011}compressive twinning and the activation of non-basal slip systems.

关键词： Magnesium alloy Long-period stacking ordered phase Transmission electron microscopy Atom probe tomography Work hardening behavior

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