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Effect of In Composition on Two-Dimensional Electron Gas in Wurtzite AlGaN/InGaN Heterostructures

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Chinese Physics Letters 2010年第11期27卷 188-190页

作者： KIM Bong-Hwan PARK Seoung-Hwan LEE Jung-hee MOON Yong-Tae Department of Electronics Engineering Catholic University of Daegu Hayang Kyeongsan Kyeongbuk 712-702 R. Korea School of Electrical Engineering and Computer Science Kyungpook National University Daegu 702-701 R. Korea LG Corporate Institute of Technology 16 Woomyeon-dong Seocho-gu Seoul 137-14-0 R. Korea

The effect of In composition on two-dimensional electron gas in wurtzite AlGaN/InGaN heterostructures is theoretically investigated. The sheet carrier density is shown to increase nearly linearly with In mole fraction x, due to the increase in the polarization charge at the AlGaN/InGaN interface. The electron sheet density is enhanced with the doping in the AlGaN layer. The sheet carrier density is as high as 3.7×1013 cm^-2 at the donor density of 10×1018 cm^-3 for the HEMT structure with x=0.3. The contribution of additional donor density on the electron sheet density is nearly independent of the In mole fraction.

关键词： Condensed matter: electrical magnetic and optical Electronics and devices Semiconductors Surfaces interfaces and thin films Condensed matter: structural mechanical & thermal Nanoscale science and low-D systems

Fabrication of Polythiophene Patterns through Blending of a Thermally Curable Polythiophene with Poly(methyl methacrylate) and Selective Thermal Curation

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Chinese Journal of Polymer Science 2017年第3期35卷 422-433页

作者： Mushtaque A.Memon Jin-hua Sun hee-Tae Jung 闫寿科耿建新 State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China National Research Laboratory Department of Chemical and Biomolecular Engineering (BK-21) Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea

In this study, we demonstrate a novel method for fabricating polythiophene patterns, i.e., cylindrical holes and cylinders, through blending of a thermally curable polythiophene carrying with tertiary ester groups(PT-tert-ESTER) and poly(methyl methacrylate)(PMMA), followed by thermal conversion of the PT-tert-ESTER to an insoluble polythiophene via low-temperature cleavage of the tertiary ester groups and removal of the PMMA component via ultraviolet degradation. We show that the surface polarity of substrates, the mass ratio of PT-tert-ESTER to PMMA in the blend solutions as well as the concentration of the blend solutions strongly influence the formation of the polythiophene patterns. Cylindrical holes are more readily formed on less polar substrates when a PT-tert-ESTER dominated blend solution is used, while cylinders are more readily formed on more polar substrates when a PMMA dominated blend solution is used. Moreover, the diameters of both the cylindrical holes and the cylinders decrease as the PT-tert-ESTER concentration is increased in the respective ranges of the PT-tert-ESTER/PMMA ratios where the patterns are formed. Grazing incident X-ray diffraction data have indicated that the patterning of the PT-tert-ESTER component in the blend films improves the crystallinity of PT-tert-ESTER as well as the molecular packing of the insoluble polythiophene in the resultant patterned polythiophene films.

关键词： Polythiophene Patterns Cylindrical holes Cylinders Blending

Activation-Tagged Suppressors of a Weak Brassinosteroid Receptor Mutant

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Molecular Plant 2010年第1期3卷 260-268页

作者： Bin Kang Hao Wang Kyoung hee Nam Jiayang Li Jianming Li Department of Molecular Cellular and Developmental Biology University of Michigan 830 N. University Ann Arbor MI 48109-1048 USA Division of Biological Sciences Sookmyung Woman's University 52 Hyochangwon-gil Yongsan-gu Seoul 140-742 Korea State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China

Brassinosteroids （BRs） are important plant hormones that act synergistically with auxin to regulate a variety of plant developmental and physiological processes. In the past decade, genetic and biochemical studies have revealed a linear signaling pathway that relies on protein phosphorylation to transmit the BR signal into the nucleus, altering ex- pression of hundreds of genes to promote plant growth. We conducted an activation-tagging based suppressor screen to look for Arabidopsis genes that, when overexpressed by inserted 35S enhancer elements, could suppress the dwarf phe- notype of a weak BR receptor mutant bril-301. This screen identified a total of six dominant activation-tagged bril sup- pressors （atbs-Ds）. Using a plasmid rescue approach, we discovered that the bril-301 suppression effect in four atbs-D mutants （atbs3-D to atbs6-D） was caused by overexpression of a YUCCA gene thought to be involved in tryptophan- dependent auxin biosynthesis. Interestingly, the three activation-tagged YUCCA genes belong to the YUCCA IIA subfamily that includes two other members out of 11 known Arabidopsis YUCCA genes. In addition, our molecular studies revealed a T-DNA insertion near a basic helix-loop-helix gene in atbsl-D and a T-DNA insertion in a region carrying a BR biosynthetic gene in atbs2-D. Further studies of these atbs-D mutants could lead to better understanding of the BR signaling process and the BR-auxin interaction.

关键词： Brassinosteroid BRI1 bril-301 auxin YUCCA.

A new analytical approach for identifying market contagion

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Financial Innovation 2022年第1期8卷 1097-1131页

作者： hee Soo Lee Tae Yoon Kim Department of Business Administration Sejong University209 Neungdong-ro Gwangjin-guSeoul 05006Korea Department of Statistics Keimyung University1095 Dalgubeol-daeroDaegu 704-701Korea.

This study proposed a new analytical approach to identify the excessive comovement of two markets as *** goal is achieved by linking latent-factor and single-equation error correction models and evaluating the breaks in the short-and long-term relationships and correlatedness in the linked *** results demonstrated that a short-term relationship representing the market speed ratio between two markets plays a key role in contagion *** a long-term relationship or correlatedness is broken(comovement change)due to a break in the short-term relationship(market speed ratio),contagion is highly likely and should be formally *** posterior probabilities were calculated to determine the ***,this study applied this analytical Bayesian approach to empirically test the contagion effects of the *** market during the global financial crisis between 2007 and 2009 using 22 developed equity markets.

关键词： Contagion test Market integration Bayesian approach Comovement Market speed ratio

Simulation of Suspended Sediment in the Yellow and East China Seas

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China Ocean Engineering 2005年第2期19卷 235-250页

作者： CHOI Byung-Ho MUN Jong-Yoon KO Jin-Seok YUK Jin-hee Department of Civil and Environmental Engineering Sungkyunkwan University Suwon 440-746 KoreaKorea Ocean Science and Engineering Corporation 175-9 Huam-dong Yongsan-gu Seoul 140-901 KoreaHyein Engineering and Construction Co. Ltd. 150-057 761 Shingil 7 dong Yungdungpogu Seoul KoreaDepartment of Civil and Environmental Engineering Sungkyunkwan University Suwon 440-746 Korea

Described is an initial attempt to simulate the suspended sediment dynamics relating to tidal and wave forcing during summertime in June 1980 and August 1981 for the Yellow and East China Seas continental shelf. The cohesive/non-cohesive sediment resuspension and movement generated by the interaction between current and wave are modeled by use of ECOMSED and WAM Cycle 4. Model results are compared with observations in US-China Marine Sedimentation Dynamics Program performed for 1980-81 at off the Changjiang estuary. The main features of simulations show that suspended sediment concentrations during the summer decreased markedly offshore as observed during the simulation periods. As for some discrepancies for the mouth of the estuary with high river discharges, i.e., the Changjiang River, the model did not properly reproduce the over-mixing situation in the summer; thus distinct vertical concentration variation in this local region is not agreeable with observation. However, general dispersal patterns of suspended sediment movement seem to be agreeably reproduced for the nearshore shallow region. Some of the procedures of simulation and results are presented and discussed.

关键词： Yellow Sea East China Sea sediment transport model time slice experiment sediment concentration

Association between scrub typhus encephalitis and diffusion tensor tractography detection of Papez circuit injury:A case report

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World Journal of Clinical Cases 2021年第13期9卷 3194-3199页

作者： Hyeok Gyu Kwon Jeong-hee Yang Jee-Hyun Kwon Dongseok Yang Department of Physical Therapy College of Health ScienceEulji UniversitySanseong-daero 13135Gyeonggi-doSouth Korea Department of Plastic Surgery Biomedical Research InstituteSeoul National University HospitalJongno-gu 03080SeoulSouth Korea Department of Neurology University of Ulsan College of MedicineUlsan University HospitalDong-gu 44033UlsanSouth Korea Department of Physical Medicine and Rehabilitation University of Ulsan College of MedicineUlsan University HospitalDong-gu 44033UlsanSouth Korea

BACKGROUND It is difficult to restore the cognitive functions of patients with impaired cognition caused by brain *** tensor imaging can visualize the integrity of neural tracts in the white matter(WM)*** is unclear whether encephalitis following scrub typhus damages the *** the first time,we aimed to report diffusion tensor tractography(DTT)findings in a chronic patient with cognitive impairment following scrub typhus encephalitis,which revealed injury to the Papez circuit of the *** SUMMARY A 70-year-old male patient was affected by encephalitis caused by scrub typhus that occurred 23 years *** had poor cognition and his clinical examination findings were as follows:Mini-Mental Status Examination score,14;and handgrip strength(right/left,kg),32.3/*** revealed serious injuries of the left thalamocingulate tract and right mammillothalamic tract in the Papez circuit,and a partial injury of the anterior part of the *** Using DTT,we found a relationship between cognitive impairment and the integrity of the Papez circuit following scrub typhus.

关键词： Diffusion tensor imaging Scrub typhus Encephalitis White matter Papez circuit Cognition Case report

Performance Improvements in Temperature Reconstructions of 2-D Tunable Diode Laser Absorption Spectroscopy(TDLAS)

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Journal of Thermal Science 2016年第1期25卷 84-89页

作者： Doo-Won Choi Min-Gyu Jeon Gyeong-Rae Cho Takahiro Kamimoto Yoshihiro Deguchi Deog-hee Doh Tokushima University 2-1 Minamijyosanjima TokushimaJapan Korea Maritime&Ocean University Dongsam-dong 1 Youngdo-guBusan 606-791Korea

Performance improvement was attained in data reconstructions of 2-dimensional tunable diode laser absorption spectroscopy(TDLAS). Multiplicative Algebraic Reconstruction Technique(MART) algorithm was adopted for data reconstruction. The data obtained in an experiment for the measurement of temperature and concentration fields of gas flows were used. The measurement theory is based upon the Beer-Lambert law, and the measurement system consists of a tunable laser, collimators, detectors, and an analyzer. Methane was used as a fuel for combustion with air in the Bunsen-type burner. The data used for the reconstruction are from the optical signals of 8-laser beams passed on a cross-section of the methane flame. The performances of MART algorithm in data reconstruction were validated and compared with those obtained by Algebraic Reconstruction Technique(ART) algorithm.

关键词： Data Reconstruction TDLAS MART ART

Topology optimization of reactive material structures for penetrative projectiles

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Defence Technology（防务技术） 2022年第7期18卷 1205-1218页

作者： Shinyu Kim Saekyeol Kim Taekyun Kim Sangin Choi Tae hee Lee Jung Su Park Sang-Hyun Jung Department of Automotive Engineering Hanyang University222 Wangsimni-roSeongdong-guSeoul04763Republic of Korea The 4th R&D Institute Agency for Defense Development35Yuseong P.O.BoxDaejeon34186Republic of Korea

Recently,reactive materials have been developed for penetrative projectiles to improve impact resistance and energy ***,the design of a reactive material structure,involving shape and size,is challenging because of difficulties such as high non-linearity of impact resistance,manufacturing limitations of reactive materials and high expenses of penetration *** this study,a design optimization methodology for the reactive material structure is developed based on the finite element analysis.A finite element model for penetration analysis is introduced to save the expenses of the *** resistance is assessed through the analysis,and result is calibrated by comparing with experimental *** on the model,topology optimization is introduced to determine shape of the *** design variables and constraints of the optimization are proposed considering the manufacturing limitations,and the optimal shape that can be manufactured by cold spraying is *** on the optimal shape,size optimization is introduced to determine the geometric dimensions of the *** a result,optimal design of the reactive material structure and steel case of the penetrative projectile,which maximizes the impact resistance,is *** the design process proposed in this study,reactive material structures can be designed considering not only mechanical performances but also manufacturing limitations,with reasonable time and cost.

关键词： Reactive material Penetrative projectile Topology optimization Manufacturing constraint Cold gas dynamic spray Additive manufacturing

Effect of Nucleases on the Cellular Internalization of Fluorescent Labeled DNA-Functionalized Single-Walled Carbon Nanotubes

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Nano Research 2008年第4期1卷 351-360页

作者： Hye Kyung Moon Chan Il Chang Dong-Ki Lee hee Cheul Choi Department of Chemistry Pohang University of Science and Technology(POSTECH)San 31Hyoja-DongNam-guPohang 790-784Korea Department of Chemistry Sungkyunkwan UniversityNatural Science CampusSuwon 440-746Korea

Nuclease effects on the cell internalization of single-walled carbon nanotubes(SWNTs)functionalized with fluorescent-labeled DNA in serum containing cell growth media were *** Cy3-labeled DNA-functionalized SWNT conjugates(Cy3DNA-SWNTs)were incubated with HeLa cells in a fatal bovine serum(FBS)medium,a high fl uorescence intensity was obtained from the cells,indicative for the high level inclusion of ***,the fluorescence intensity was remarkably reduced if Cy3DNA-SWNTs were incubated with cells in the FBS-free *** systematic control experiments revealed that Cy3 dye molecules were released from Cy3DNA-SWNT conjugates by nuclease,and the free Cy3 dyes penetrate into HeLa cell with high *** the actual amounts of SWNTs internalized in the cells were almost identical for both cells incubated in the FBS-present and FBS-absent media according to the Raman measurements,one should be cautious to determine the degree of SWNT internalization based on the fl uorescence intensities especially when the coloring dye molecules were linked to oligonucleotides in nuclease containing media.

关键词： Single-walled carbon nanotube oligonucleotide cellular delivery molecular transporter nuclease