13 results on '"Park, H-S."'
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2. Fuel gain exceeding unity in an inertially confined fusion implosion
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Hurricane, O.A., Callahan, D.A., Casey, D.T., Celliers, P.M., Cerjan, C., Dewald, E.L., Dittrich, T.R., Doppner, T., Hinkel, D.E., Hopkins, L.F. Berzak, Kline, J.L., Pape, S. Le, Ma, T., MacPhee, A.G., Milovich, J.L., Pak, A., Park, H.-S., Pate, P.K., Remington, B.A., Salmonson, J.D., Springer, P.T., and Tommasini, R.
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Nuclear fusion -- Research ,Nuclear research ,Deuterium -- Properties ,Tritium -- Properties ,Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Ignition is needed to make fusion energy a viable alternative energy source, but has yet to be achieved (1). A key step on the way to ignition is to have the energy generated through fusion reactions in an inertially confined fusion plasma exceed the amount of energy deposited into the deuterium--tritium fusion fuel and hotspot during the implosion process, resulting in a fuel gain greater than unity. Here we report the achievement of fusion fuel gains exceeding unity on the US National Ignition Facility using a 'high-foot' implosion method (2,3), which is a manipulation of the laser pulse shape in a way that reduces instability in the implosion. These experiments show an order-of-magnitude improvement in yield performance over past deuterium--tritium implosion experiments. We also see a significant contribution to the yield from α-particle self-heating and evidence for the 'bootstrapping' required to accelerate the deuterium-tritium fusion burn to eventually 'run away' and ignite., At the National Ignition Facility (NIF), 192 lasers deliver up to 1.9 MJ of light into a gold hohlraum, a cylindrically shaped radiation cavity (Fig. 1), that converts the energy [...]
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- 2014
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3. Generation of scaled protogalactic seed magnetic fields in laser-produced shock waves
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Gregori, G., Ravasio, A., Murphy, C.D., Schaar, K., Baird, A., Bell, A.R., Benuzzi-Mounaix, A., Bingham, R., Constantin, C., Drake, R.P., Edwards, M., Everson, E.T., Gregory, C.D., Kuramitsu, Y., Lau, W., Mithen, J., Niemann, C., Park, H.-S., Remington, B.A., Reville, B., Robinson, A.P.L., Ryutov, D.D., Sakawa, Y., Yang, S., Woolsey, N.C., and Miniati, M. Koenig F.
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Shock waves -- Properties ,Galaxies -- Magnetic properties -- Models ,Magnetic fields -- Origin -- Models ,Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
The standard model for the origin of galactic magnetic fields is through the amplification of seed fields via dynamo or turbulent processes to the level consistent with present observations (1-3). Although other mechanisms may also operate (4,5), currents from misaligned pressure and temperature gradients (the Biermann battery process) inevitably accompany the formation of galaxies in the absence of a primordial field. Driven by geometrical asymmetries in shocks (6) associated with the collapse of protogalactic structures, the Biermann battery is believed to generate tiny seed fields to a level of about [10.sup.-21] gauss (refs 7, 8). With the advent of high-power laser systems in the past two decades, a new area of research has opened in which, using simple scaling relations (9,10), astrophysical environments can effectively be reproduced in the laboratory (11,12). Here we report the results of an experiment that produced seed magnetic fields by the Biermann battery effect. We show that these results can be scaled to the intergalactic medium, where turbulence, acting on timescales of around 700 million years, can amplify the seed fields (13,14) sufficiently to affect galaxy evolution., We conducted these experiments at the Laboratoire pour l'Utilisation de Lasers Intenses (LULI 2000) laser facility. The intense laser was used to illuminate a small carbon rod inside a low-pressure [...]
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- 2012
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4. The afterglow of GRB 050709 and the nature of the short-hard γ-ray bursts
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Fox, D. B., Frail, D. A., Price, P. A., Kulkarni, S. R., Berger, E., Piran, T., Soderberg, A. M., Cenko, S. B., Cameron, P. B., Gal-Yam, A., Kasliwal, M. M., Moon, D.-S., Harrison, F. A., Nakar, E., Schmidt, B. P., Penprase, B., Chevalier, R. A., Kumar, P., Roth, K., Watson, D., Lee, B. L., Shectman, S., Phillips, M. M., Roth, M., McCarthy, P. J., Rauch, M., Cowie, L., Peterson, B. A., Rich, J., Kawai, N., Aoki, K., Kosugi, G., Totani, T., Park, H.-S., MacFadyen, A., and Hurley, K. C.
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Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Author(s): D. B. Fox (corresponding author) [1, 2]; D. A. Frail (corresponding author) [3]; P. A. Price [4]; S. R. Kulkarni [1]; E. Berger [5]; T. Piran [1, 6]; A. [...]
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- 2005
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5. The DNA sequence of human chromosome 21
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Hattori, M., Fujiyama, A., Taylor, T. D., Watanabe, H., Yada, T., Park, H.-S., Toyoda, A., Ishii, K., Totoki, Y., Choi, D.-K., Soeda, E., Ohki, M., Takagi, T., Sakaki, Y., Taudien, S., Blechschmidt, K., Polley, A., Menzel, U., Delabar, J., Kumpf, K., Lehmann, R., Patterson, D., Reichwald, K., Rump, A., Schillhabel, M., Schudy, A., Zimmermann, W., Rosenthal, A., Kudoh, J., Shibuya, K., Kawasaki, K., Asakawa, S., Shintani, A., Sasaki, T., Nagamine, K., Mitsuyama, S., Antonarakis, S. E., Minoshima, S., Shimizu, N., Nordsiek, G., Hornischer, K., Brandt, P., Scharfe, M., Schon, O., Desario, A., Reichelt, J., Kauer, G., Blocker, H., Ramser, J., Beck, A., Klages, S., Hennig, S., Riesselmann, L., Dagand, E., Haaf, T., Wehrmeyer, S., Borzym, K., Gardiner, K., Nizetic, D., Francis, F., Lehrach, H., Reinhardt, R., and Yaspo, M.-L.
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Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Author(s): M. Hattori [1]; A. Fujiyama [1]; T. D. Taylor [1]; H. Watanabe [1]; T. Yada [1]; H.-S. Park [1]; A. Toyoda [1]; K. Ishii [1]; Y. Totoki [1]; D.-K. [...]
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- 2000
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6. A photometric redshift of z = 6.39 ± 0.12 for GRB 050904
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Haislip, J. B., Nysewander, M. C., Reichart, D. E., Levan, A., Tanvir, N., Cenko, S. B., Fox, D. B., Price, P. A., Castro-Tirado, A. J., Gorosabel, J., Evans, C. R., Figueredo, E., MacLeod, C. L., Kirschbrown, J. R., Jelinek, M., Guziy, S., de Ugarte Postigo, A., Cypriano, E. S., LaCluyze, A., Graham, J., Priddey, R., Chapman, R., Rhoads, J., Fruchter, A. S., Lamb, D. Q., Kouveliotou, C., Wijers, R. A. M. J., Bayliss, M. B., Schmidt, B. P., Soderberg, A. M., Kulkarni, S. R., Harrison, F. A., Moon, D. S., Gal-Yam, A., Kasliwal, M. M., Hudec, R., Vitek, S., Kubanek, P., Crain, J. A., Foster, A. C., Clemens, J. C., Bartelme, J. W., Canterna, R., Hartmann, D. H., Henden, A. A., Klose, S., Park, H.-S., Williams, G. G., Rol, E., O'Brien, P., Bersier, D., Prada, F., Pizarro, S., Maturana, D., Ugarte, P., Alvarez, A., Fernandez, A. J. M., Jarvis, M. J., Moles, M., Alfaro, E., Ivarsen, K. M., Kumar, N. D., Mack, C. E., Zdarowicz, C. M., Gehrels, N., Barthelmy, S., and Burrows, D. N.
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- 2006
7. Possible gravitational microlensing of a star in the Large Magellanic Cloud
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Alcock, C., Akerlof, C.W., Allsman, R.A., Axelrod, T.S., Bennett, D.P., Chan, S., Cook, K.H., Freeman, K.C., Griest, K., Marshall, S.L., Park, H.-S., Perlmutter, S., Peterson, B.A., Pratt, M.R., Quinn, P.J., Rodgers, A.W., Stubbs, C.W., and Sutherland, W.
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Gravitational lenses -- Research ,Magellanic Clouds -- Observations ,Dark matter (Astronomy) -- Research ,Stars -- Observations ,Neutrinos -- Research ,Milky Way -- Research ,Astronomical research -- Analysis ,Astrophysics -- Research ,Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Microlensing experiments reveal that the dark matter in the Milky Way Galaxy exists as weakly interacting massive particles and as massive compact halo objects (MACHOs). MACHOs may range from the size of small planets to bodies four times larger than the Sun. MACHOs may even act as gravitational microlenses that can be detected even though the dark matter itself cannot be detected.
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- 1993
8. Corrigendum: fuel gain exceeding unity in an inertially confined fusion implosion
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Hurricane, O.A., Callahan, D.A., Casey, D.T., Celliers, P.M., Cerjan, C., Dewald, E.L., Dittrich, T.R., Doppner, T., Hinkel, D.E., Hopkins, L.F. Berzak, Kline, J.L., LePape, S., Ma, T., MacPhee, A.G., Milovich, J.L., Pak, A., Park, H.-S., Patel, P.K., Remington, B.A., Salmonson, J.D., Springer, P.T., and Tommasini, R.
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Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Nature 506, 343-348 (2014); doi:10.1038/nature13008 In the legend to Fig. 2 of this Letter, we should have acknowledged the X-ray and neutron imaging as follows: X-ray image analysis (1,2) was [...]
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- 2014
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9. Erratum: Corrigendum: Fuel gain exceeding unity in an inertially confined fusion implosion
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Hurricane, O. A., primary, Callahan, D. A., additional, Casey, D. T., additional, Celliers, P. M., additional, Cerjan, C., additional, Dewald, E. L., additional, Dittrich, T. R., additional, Döppner, T., additional, Hinkel, D. E., additional, Hopkins, L. F. Berzak, additional, Kline, J. L., additional, LePape, S., additional, Ma, T., additional, MacPhee, A. G., additional, Milovich, J. L., additional, Pak, A., additional, Park, H.-S., additional, Patel, P. K., additional, Remington, B. A., additional, Salmonson, J. D., additional, Springer, P. T., additional, and Tommasini, R., additional
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- 2014
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10. correction: The DNA sequence of human chromosome 21
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Hattori, M., Fujiyama, A., Taylor, T. D., Watanabe, H., Yada, T., Park, H.-S., Toyoda, A., Ishii, K., Totoki, Y., Choi, D.-K., Groner, Y., Soeda, E., Ohki, M., Takagi, T., Sakaki, Y., Taudien, S., Blechschmidt, K., Polley, A., Menzel, U., Delabar, J., Kumpf, K., Lehmann, R., Patterson, D., Reichwald, K., Rump, A., Schillhabel, M., Schudy, A., Zimmermann, W., Rosenthal, A., Kudoh, J., Schibuya, K., Kawasaki, K., Asakawa, S., Shintani, A., Sasaki, T., Nagamine, K., Mitsuyama, S., Antonarakis, S. E., Minoshima, S., Shimizu, N., Nordsiek, G., Hornischer, K., Brant, P., Scharfe, M., Schon, O., Desario, A., Reichelt, J., Kauer, G., Blocker, H., Ramser, J., Beck, A., Klages, S., Hennig, S., Riesselmann, L., Dagand, E., Haaf, T., Wehrmeyer, S., Borzym, K., Gardiner, K., Nizetic, D., Francis, F., Lehrach, H., Reinhardt, R., and Yaspo, M.-L.
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Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Author(s): The chromosome 21 mapping and sequencing consortium; M. Hattori; A. Fujiyama; T. D. Taylor; H. Watanabe; T. Yada; H.-S. Park; A. Toyoda; K. Ishii; Y. Totoki; D.-K. Choi; Y. [...]
- Published
- 2000
- Full Text
- View/download PDF
11. A photometric redshift of z = 6.39 +/- 0.12 for GRB 050904.
- Author
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Haislip JB, Nysewander MC, Reichart DE, Levan A, Tanvir N, Cenko SB, Fox DB, Price PA, Castro-Tirado AJ, Gorosabel J, Evans CR, Figueredo E, MacLeod CL, Kirschbrown JR, Jelinek M, Guziy S, de Ugarte Postigo A, Cypriano ES, LaCluyze A, Graham J, Priddey R, Chapman R, Rhoads J, Fruchter AS, Lamb DQ, Kouveliotou C, Wijers RA, Bayliss MB, Schmidt BP, Soderberg AM, Kulkarni SR, Harrison FA, Moon DS, Gal-Yam A, Kasliwal MM, Hudec R, Vitek S, Kubanek P, Crain JA, Foster AC, Clemens JC, Bartelme JW, Canterna R, Hartmann DH, Henden AA, Klose S, Park HS, Williams GG, Rol E, O'Brien P, Bersier D, Prada F, Pizarro S, Maturana D, Ugarte P, Alvarez A, Fernandez AJ, Jarvis MJ, Moles M, Alfaro E, Ivarsen KM, Kumar ND, Mack CE, Zdarowicz CM, Gehrels N, Barthelmy S, and Burrows DN
- Abstract
Gamma-ray bursts (GRBs) and their afterglows are the most brilliant transient events in the Universe. Both the bursts themselves and their afterglows have been predicted to be visible out to redshifts of z approximately 20, and therefore to be powerful probes of the early Universe. The burst GRB 000131, at z = 4.50, was hitherto the most distant such event identified. Here we report the discovery of the bright near-infrared afterglow of GRB 050904 (ref. 4). From our measurements of the near-infrared afterglow, and our failure to detect the optical afterglow, we determine the photometric redshift of the burst to be z = 6.39 - 0.12 + 0.11 (refs 5-7). Subsequently, it was measured spectroscopically to be z = 6.29 +/- 0.01, in agreement with our photometric estimate. These results demonstrate that GRBs can be used to trace the star formation, metallicity, and reionization histories of the early Universe.
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- 2006
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12. DNA sequence and comparative analysis of chimpanzee chromosome 22.
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Watanabe H, Fujiyama A, Hattori M, Taylor TD, Toyoda A, Kuroki Y, Noguchi H, BenKahla A, Lehrach H, Sudbrak R, Kube M, Taenzer S, Galgoczy P, Platzer M, Scharfe M, Nordsiek G, Blöcker H, Hellmann I, Khaitovich P, Pääbo S, Reinhardt R, Zheng HJ, Zhang XL, Zhu GF, Wang BF, Fu G, Ren SX, Zhao GP, Chen Z, Lee YS, Cheong JE, Choi SH, Wu KM, Liu TT, Hsiao KJ, Tsai SF, Kim CG, OOta S, Kitano T, Kohara Y, Saitou N, Park HS, Wang SY, Yaspo ML, and Sakaki Y
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- Animals, Chromosomes, Human, Pair 21 genetics, Gene Expression Profiling, Genes genetics, Genomics, Humans, Mutagenesis genetics, Phylogeny, Polymorphism, Single Nucleotide genetics, Promoter Regions, Genetic genetics, Repetitive Sequences, Nucleic Acid genetics, Retroelements genetics, Sequence Analysis, DNA, Chromosomes, Mammalian genetics, Evolution, Molecular, Pan troglodytes genetics, Physical Chromosome Mapping
- Abstract
Human-chimpanzee comparative genome research is essential for narrowing down genetic changes involved in the acquisition of unique human features, such as highly developed cognitive functions, bipedalism or the use of complex language. Here, we report the high-quality DNA sequence of 33.3 megabases of chimpanzee chromosome 22. By comparing the whole sequence with the human counterpart, chromosome 21, we found that 1.44% of the chromosome consists of single-base substitutions in addition to nearly 68,000 insertions or deletions. These differences are sufficient to generate changes in most of the proteins. Indeed, 83% of the 231 coding sequences, including functionally important genes, show differences at the amino acid sequence level. Furthermore, we demonstrate different expansion of particular subfamilies of retrotransposons between the lineages, suggesting different impacts of retrotranspositions on human and chimpanzee evolution. The genomic changes after speciation and their biological consequences seem more complex than originally hypothesized.
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- 2004
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13. A physical map of the human genome.
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McPherson JD, Marra M, Hillier L, Waterston RH, Chinwalla A, Wallis J, Sekhon M, Wylie K, Mardis ER, Wilson RK, Fulton R, Kucaba TA, Wagner-McPherson C, Barbazuk WB, Gregory SG, Humphray SJ, French L, Evans RS, Bethel G, Whittaker A, Holden JL, McCann OT, Dunham A, Soderlund C, Scott CE, Bentley DR, Schuler G, Chen HC, Jang W, Green ED, Idol JR, Maduro VV, Montgomery KT, Lee E, Miller A, Emerling S, Kucherlapati, Gibbs R, Scherer S, Gorrell JH, Sodergren E, Clerc-Blankenburg K, Tabor P, Naylor S, Garcia D, de Jong PJ, Catanese JJ, Nowak N, Osoegawa K, Qin S, Rowen L, Madan A, Dors M, Hood L, Trask B, Friedman C, Massa H, Cheung VG, Kirsch IR, Reid T, Yonescu R, Weissenbach J, Bruls T, Heilig R, Branscomb E, Olsen A, Doggett N, Cheng JF, Hawkins T, Myers RM, Shang J, Ramirez L, Schmutz J, Velasquez O, Dixon K, Stone NE, Cox DR, Haussler D, Kent WJ, Furey T, Rogic S, Kennedy S, Jones S, Rosenthal A, Wen G, Schilhabel M, Gloeckner G, Nyakatura G, Siebert R, Schlegelberger B, Korenberg J, Chen XN, Fujiyama A, Hattori M, Toyoda A, Yada T, Park HS, Sakaki Y, Shimizu N, Asakawa S, Kawasaki K, Sasaki T, Shintani A, Shimizu A, Shibuya K, Kudoh J, Minoshima S, Ramser J, Seranski P, Hoff C, Poustka A, Reinhardt R, and Lehrach H
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- Chromosomes, Artificial, Bacterial, Cloning, Molecular, DNA Fingerprinting, Gene Duplication, Humans, In Situ Hybridization, Fluorescence, Repetitive Sequences, Nucleic Acid, Contig Mapping, Genome, Human
- Abstract
The human genome is by far the largest genome to be sequenced, and its size and complexity present many challenges for sequence assembly. The International Human Genome Sequencing Consortium constructed a map of the whole genome to enable the selection of clones for sequencing and for the accurate assembly of the genome sequence. Here we report the construction of the whole-genome bacterial artificial chromosome (BAC) map and its integration with previous landmark maps and information from mapping efforts focused on specific chromosomal regions. We also describe the integration of sequence data with the map.
- Published
- 2001
- Full Text
- View/download PDF
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