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Ring and Volcano Structures Formed by a Metal Dipyrromethene Complex

  • Son, Seung Bae;Miao, Qing;Shin, Ji-Young;Dolphin, David;Hahn, Jae Ryang
    • Bulletin of the Korean Chemical Society
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    • v.35 no.6
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    • pp.1727-1731
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    • 2014
  • Dichloromethane liquid droplets containing a cobalt dipyrromethene trimer deposited on a graphite surface were found to form coffee ring, toroid ring, or volcano dot structures due to the redistribution of the solute during solvent evaporation. The shapes and size distributions of the ring structures depended on the drying temperature. The shape differences were attributed to the fact that the solvent evaporation rate controlled the self-assembly process that yielded the coffee stain and pinhole structures.

SLS of Si Films on Polymer Substrates;Materials and Devices

  • Limanov, A.B.;Wilt, P.C. van der;Kane, M.G.;Firester, A.H.;Goodman, L.;Lee, J;Abelson, J.R.;Im, James S.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.491-494
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    • 2006
  • A number of research groups and companies have succeeded in employing various SLS schemes to create low defect-density Si films on glass substrates for making high performance TFTs. In this paper, we first point out that SLS can be utilized to just as effectively handle crystallization of thin Si films on polymer substrates, and then present preliminary results on high-performance circuits that are built using the materials.

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American Ginseng Culture in the Arid Climates of British Columbia (British Columbia의 건조기후에서 미국인삼의 재배)

  • Hon, John Sanage
    • Journal of Ginseng Research
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    • v.15 no.1
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    • pp.41-73
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    • 1991
  • As with any crop. There are many things that need to be done to achieve success. IT must be emphasized that this is one crop that demands 100percent or more. This is a high input crop, a long tern crop, a labor intensive crop and a high return crop. However, to get the returns you cannot take shortcuts or go half way. It is essential that you do your homework before you commence this venture. This factsheet is designed to cover the basic steps involved in growing ginseng and some of the details. It does not contain all the bits and pieces of information needed. Many of these are practical, many are solved 'on the farm' and many necessary items can be purchased at the local hardware store. We suggest you do not venture into this crop until you have done your homework. At this time. we do not pretend to have all the answers and this publication serves only as a guideline. We wish you sell in this new agricultural industry in B.C.

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Atomic Layer $MoS_2$ Field-effect Transistors on Hexagonal Boron Nitride Substrate

  • Yu, Yeong-Jun;Lee, Gwan-Hyeong;Hone, James;Kim, Philip
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.192-192
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    • 2012
  • The next generation electronics need to not only be smaller but also be more flexible. To meet such demands, electronic devices using two dimensional (2D) atomic crystals like graphene, hexagonal boron nitride (h-BN), molybdenum disulfate ($MoS_2$) and organic thin film have been studied intensely. In this talk, I will demonstrate the $MoS_2$ field effect transistor (FET) toward performance enhancement by insulating h-BN substrate.

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The cAMP/Protein Kinase A Pathway and Virulence in Cryptococcus neoformans

  • Kronstad, James W.;Hu, Guang-Gan;Choi, Jae-Hyuk
    • Mycobiology
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    • v.39 no.3
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    • pp.143-150
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    • 2011
  • The basidiomycete fungus Cryptococcus neoformans is an important pathogen of immunocompromised people. The ability of the fungus to sense its environment is critical for proliferation and the generation of infectious propagules, as well as for adaptation to the mammalian host during infection. The conserved cAMP/protein kinase A pathway makes an important contribution to sensing, as demonstrated by the phenotypes of mutants with pathway defects. These phenotypes include loss of the ability to mate and to elaborate the key virulence factors capsule and melanin. This review summarizes recent work that reveals new targets of the pathway, new phenotypic consequences of signaling defects, and a more detailed understanding of connections with other aspects of cryptococcal biology including iron regulation, pH sensing, and stress.

Structural Studies of the Self-Assemblies Created with Dipyrrins

  • Shin, Ji-Young;Patrick, Brian O.;Son, Seung-Bae;Hahn, Jae-Ryang;Dolphin, David
    • Bulletin of the Korean Chemical Society
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    • v.31 no.4
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    • pp.1004-1013
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    • 2010
  • Three-dimensional superstructures of unique self-assemblies generated by exploring the conformational flexibility of various dipyrromethenes through creation of hydrogen-bonds with metal-halide anions are reported and the conformational diversity is thoroughly described in the solid and solution states by X-ray diffraction analysis and variable temperature NMR spectroscopy. The tetrahedral or octahedral structures of their precursors, various metal-dipyrromethene complexes, are also reported, based on the crystallographic data. STM images of the self-assemblies observed on graphite surfaces present interesting arrangements and appear as tubular bunches.

Optimal design of reinforced concrete beams: A review

  • Rahmanian, Ima;Lucet, Yves;Tesfamariam, Solomon
    • Computers and Concrete
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    • v.13 no.4
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    • pp.457-482
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    • 2014
  • This paper summarizes available literature on the optimization of reinforced concrete (RC) beams. The objective of optimization (e.g. minimum cost or weight), the design variables and the constraints considered by different studies vary widely and therefore, different optimization methods have been employed to provide the optimal design of RC beams, whether as isolated structural components or as part of a structural frame. The review of literature suggests that nonlinear deterministic approaches can be efficiently employed to provide optimal design of RC beams, given the small number of variables. This paper also presents spreadsheet implementation of cost optimization of RC beams in the familiar MS Excel environment to illustrate the efficiency of the exhaustive enumeration method for such small discrete search spaces and to promote its use by engineers and researchers. Furthermore, a sensitivity analysis is performed on the contribution of various design parameters to the variability of the overall cost of RC beams.

Living Labs as a Model for University Innovation (대학의 혁신모델로서 리빙랩: 현황과 과제)

  • Seong, Ji-eun;Kim, Min-su
    • Journal of Engineering Education Research
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    • v.21 no.6
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    • pp.118-127
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    • 2018
  • Recently, universities have applied a living lab as a user-led innovation model. This study analyzed two cases, British Columbia University, and D University. They are trying to change current provider-centered and expert-centered education model which encounters the limitations. To deriving the characteristics of university living lab, we analyzed the background, goals, methods, and implications of each case. The University of British Columbia operated a living lab centered on university buit-in environment. Students and faculty members participated in the living lab as proconsumers. D University operated a living lab as part of industry - academia cooperation and regional cooperation. The local community was set up as a living lab and knowledge providers, students, and users, local citizens, solved the problem jointly. Although the methods of living labs are different from each other, they are introducing new research and education methods and utilizing participatory governance.

Novel approaches for generating and manipulating diploid strains of Chlamydomonas reinhardtii

  • Kariyawasam, Thamali;Joo, Sunjoo;Goodenough, Ursula;Lee, Jae-Hyeok
    • ALGAE
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    • v.34 no.1
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    • pp.35-43
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    • 2019
  • Genetic study of haploid organisms offers the advantage that mutant phenotypes are directly displayed, but has the disadvantage that strains carrying lethal mutations are not readily maintained. We describe an approach for generating and performing genetic analysis of diploid strains of Chlamydomonas reinhardtii, which is normally haploid. First protocol utilizes self-mating diploid strains that will facilitate the genetic analysis of recessive lethal mutations by offering a convenient way to produce homozygous diploids in a single mating. Second protocol is designed to reduce the chance of contamination and the accumulation of spontaneous mutations for long-term storage of mutant strains. Third protocol for inducing the meiotic program is also included to produce haploid mutant strains following tetraploid genetic analysis. We discuss implication of self-fertile strains for the future of Chlamydomonas research.

Characteristics of Third Year American Ginseng Root Yields for Lytton, British Columbia, Canada

  • Gin, H.;Bailey, W.G.;Wong, S.T.
    • Journal of Ginseng Research
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    • v.13 no.2
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    • pp.147-152
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    • 1989
  • The statistical characteristics of three year old American ginseng (Panax quinquefolium 1.) root yields from Lytton, British Columbia, Canada are presented. Ginseng root yield is related to plant density, with the highest yields generally obtained from the sites with the highest plant densities. However, these higher yields are made up of a larger proportion of smaller roots while the proportion of larger roots remains almost constant throughout the range of plant densities sampled. Further, it is suggested that relatively small samples can provide significant insight into crop performance and growth.

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