Search Results - (Author, Cooperation:W. J. Choi)

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  1. 1
    N. Annaluru ; H. Muller ; L. A. Mitchell ; S. Ramalingam ; G. Stracquadanio ; S. M. Richardson ; J. S. Dymond ; Z. Kuang ; L. Z. Scheifele ; E. M. Cooper ; Y. Cai ; K. Zeller ; N. Agmon ; J. S. Han ; M. Hadjithomas ; J. Tullman ; K. Caravelli ; K. Cirelli ; Z. Guo ; V. London ; A. Yeluru ; S. Murugan ; K. Kandavelou ; N. Agier ; G. Fischer ; K. Yang ; J. A. Martin ; M. Bilgel ; P. Bohutski ; K. M. Boulier ; B. J. Capaldo ; J. Chang ; K. Charoen ; W. J. Choi ; P. Deng ; J. E. DiCarlo ; J. Doong ; J. Dunn ; J. I. Feinberg ; C. Fernandez ; C. E. Floria ; D. Gladowski ; P. Hadidi ; I. Ishizuka ; J. Jabbari ; C. Y. Lau ; P. A. Lee ; S. Li ; D. Lin ; M. E. Linder ; J. Ling ; J. Liu ; M. London ; H. Ma ; J. Mao ; J. E. McDade ; A. McMillan ; A. M. Moore ; W. C. Oh ; Y. Ouyang ; R. Patel ; M. Paul ; L. C. Paulsen ; J. Qiu ; A. Rhee ; M. G. Rubashkin ; I. Y. Soh ; N. E. Sotuyo ; V. Srinivas ; A. Suarez ; A. Wong ; R. Wong ; W. R. Xie ; Y. Xu ; A. T. Yu ; R. Koszul ; J. S. Bader ; J. D. Boeke ; S. Chandrasegaran
    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-03-29
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Base Sequence ; *Chromosomes, Fungal/genetics/metabolism ; DNA, Fungal/genetics ; Genes, Fungal ; Genetic Fitness ; Genome, Fungal ; Genomic Instability ; Introns ; Molecular Sequence Data ; Mutation ; Polymerase Chain Reaction ; RNA, Fungal/genetics ; RNA, Transfer/genetics ; Saccharomyces cerevisiae/cytology/*genetics/physiology ; Sequence Analysis, DNA ; Sequence Deletion ; Synthetic Biology/*methods ; Transformation, Genetic
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2018-02-10
    Publisher:
    The American Association of Immunologists (AAI)
    Print ISSN:
    0022-1767
    Electronic ISSN:
    1550-6606
    Topics:
    Medicine
    Published by:
    http://www.aai.org/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    Publication Date:
    2013-01-26
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Choi, W. J. ; Lee, S. ; Kim, Y. ; Woo, D. ; Kim, S. K. ; Kim, S. H. ; Lee, J. I. ; Kang, K. N. ; Chu, J. H. ; Yu, S. K. ; Seo, J. C. ; Kim, D. ; Cho, K.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Time resolved photoluminescence (PL) characteristics of a SiN cap disordered GaAs/AlGaAs multiple quantum well (MQW) structure exhibit a decrease in carrier lifetime in conjunction with an increase in quantum well disordering (QWD) as the SiN capping layer thickness is increased. The decrease in carrier lifetime is attributed to enhanced carrier trapping due to the defects introduced during dielectric cap quantum well disordering and the relaxation of the momentum conservation during radiative recombination by QWD. Potential applications of these effects on high speed optical devices such as laser diodes (LD's) and optical modulators are discussed. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.115272

    Articles: DFG German National Licenses
  5. 5
    Kobayashi, N. P. ; Kobayashi, J. T. ; Dapkus, P. D. ; Choi, W.-J. ; Bond, A. E.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We have demonstrated that GaN can be grown epitaxially by atmospheric pressure metalorganic chemical vapor deposition on an aluminum oxide compound layer utilized as an intermediate layer between GaN and a Si(111). X-ray diffraction measurement indicates that single-crystal hexagonal GaN with its basal plane parallel to the Si(111) plane is grown. Using a scanning electron microscope, the macroscopic evolution of GaN grown on the AlOx/Si(111) substrate is found to be similar to that of GaN grown on a sapphire(0001) substrate. Cathodoluminescence (CL) spectrum shows a unique emission that consists of several peaks with the intensity comparable to that of the near-band-edge emission. Unique characteristics in CL spectrum are discussed in terms of a possible oxygen contamination of GaN grown on the AlOx/Si(111) substrate. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.120394

    Articles: DFG German National Licenses
  6. 6
    Yeh, Everett C. C. ; Choi, W. J. ; Tu, K. N.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    In a flip chip solder joint, the cross-section of the solder bump is one to two orders of magnitude bigger than that of an interconnect wire. At the contact interface between the bump and the wire, a very large current crowding occurs and it causes a unique and fast electromigration failure in the bump. Simulation of the current crowding phenomenon in a flip chip solder bump is reported here. Experimental results of real flip chip solder bumps show that void formation begins near the current crowding region of the contact, and after it is nucleated, it spreads quickly across the contact area. By designing the solder bump to achieve a uniform current distribution, we can improve its electromigration resistance and increase its current carrying capacity. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1432443

    Articles: DFG German National Licenses
  7. 7
    Choi, W.-J. ; Clark, M.W. ; Chen, J.X. ; Jong, A.Y.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0006-291X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0006-291X(90)91594-I

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1572-817X
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Electrical Engineering, Measurement and Control Technology
    Physics
    Notes:
    Abstract High-relfection (HR)-coated facet effects on the spectral characteristics of a three-section distributed Bragg reflector (DBR) tunable laser are investigated theoretically, in which the output power emits to the DBR section. It is found that the output power to the DBR sectionP DBR compared to the cleaved facet output powerP 0 is nearly constant to some degree with increasing tuning current. Owing to the high-Q resonator, the HR-coated DBR laser showed a decrease in spectral linewidth. However, there is still linewidth broadening of the HR-coated DBR laser even though the rate of increase is smaller than that of the cleaved-facet DBR laser. In the case of output power emission to the DBR section, it is thought that the HR-coated effect can overcome the decrease in output power under frequency tuning, which is one of the most important drawbacks of DBR laser performance.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00563586

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1432-0614
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Process Engineering, Biotechnology, Nutrition Technology
    Notes:
    Abstract Large-scale resolution of epoxides by the yeast Rhodotorula glutinis was demonstrated in an aqueous/organic two-phase cascade membrane bioreactor. Due to the chemical instability and low solubility of epoxides in aqueous phases, an organic solvent was introduced into the reaction mixture in order to enhance the resolution of epoxide. A cascade hollow-fiber membrane bioreactor was used (1) to minimize the toxicity of organic solvents towards the epoxide hydrolase of R. glutinis, and (2) to remove inhibitory amounts of formed diol from the yeast cell containing aqueous phase. Dodecane was selected as a suitable solvent and 1,2-epoxyhexane as a model substrate. By use of this membrane bioreactor, highly concentrated (0.9 M in dodecane) enantiopure (〉 98% ee) (S)-1,2-epoxyhexane (6.5 g, 30% yield) was obtained from the racemic mixture.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s002530051606

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1432-0614
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Process Engineering, Biotechnology, Nutrition Technology
    Notes:
    Abstract A two-phase membrane bioreactor was developed to continuously produce enantiopure epoxides using the epoxide hydrolase activity of Rhodotorula glutinis. An aqueous/organic cascade, hydrophilic, hollow-fiber membrane bioreactor was used: (1) to carry out large-scale resolution of epoxides, (2) to continuously extract residual enantiopure epoxides from the aqueous phase, and (3) to separate inhibitory formed diol from the yeast cells contained in the aqueous phase. Dodecane was employed to dissolve-feed epoxide as well as to extract residual epoxide. 1,2-Epoxyhexane was used as a model substrate. By use of this membrane bioreactor, enantiopure (S)-1,2-epoxyhexane (〉98% enantiomeric excess) was obtained with a volumetric productivity of 3.8 g l−1 h−1. The continuous-production system was operated for 12 days and resulted in 38 g enantiopure (S)-1,2-epoxyhexane.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s002530000451

    Articles: DFG German National Licenses
  11. 11
    Yi, H. T. ; Cho, J. ; Choi, W. J. ; Woo, D. H. ; Kim, S. H. ; Kang, K. N.
    Springer
    Published 2000
    Staff View
    ISSN:
    1573-4811
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1006716910637

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    1573-4811
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00420787

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    1573-4811
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00462206

    Articles: DFG German National Licenses
  14. 14
    Parisot, J. ; Rafi, O. ; Choi, W. J.

    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Published 1984
    Staff View
    ISSN:
    0032-3888
    Keywords:
    Chemistry ; Chemical Engineering
    Source:
    Wiley InterScience Backfile Collection 1832-2000
    Topics:
    Chemistry and Pharmacology
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Notes:
    Internal friction has been measured by torsion at 1 Hz during tensile tests performed on glassy polycarbonate at room-temperature. Steady-state flow and transient effects have been studied during continuous tensile tests and strain-rate changes. During steady-state, internal friction and flow-stress vary in a similar way with strain-rate. But during transients, internal friction varies continuously while flow-stress passes through a maximum (or a minimum). These results are interpreted assuming that non-elastic deformation of glassy polymers requires some microscopic discontinuous processes such as motion of defects. Two parameters are considered: the velocity v and the density ρ of mobile defects. Assuming that the former is directly related to the flow stress, it has been shown that internal friction is related to the density of mobile defects ρ. This feature is used to interpret the different stages of a tensile test curve. Activation volumes for both velocity and density of mobile defects are calculated from experimental data.
    Additional Material:
    13 Ill.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1002/pen.760241108

    Articles: DFG German National Licenses