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Search Results: 1 - 10 of 21606 matches for " Chul Hoon Kim "
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Performance Assessment of Ammonia-Water Based Power and Refrigeration Cogeneration Cycle
Kyoung Hoon Kim,Giman Kim,Chul Ho Han
International Journal of Materials, Mechanics and Manufacturing , 2013, DOI: 10.7763/ijmmm.2013.v1.8
Abstract: Recently the concept of combined power and cooling cycles using ammonia-water mixture as the working fluid has attracted much attention, since such systems may offer a reasonable arrangement of energy and exergy flow. In this work thermodynamic performance analysis of combined thermal power and cooling cogeneration cycle using ammonia-water mixture as the working fluid is carried out for efficient use of low-grade heat sources. The cycle is a combination of Rankine cycle and absorption refrigeration cycle, and is investigated parametrically for the purpose of extracting the maximum utilization from a given heat source. A special attention is paid to the effects of important system parameters including turbine inlet pressure, ammonia concentration, and absorber temperature on the performance characteristics of the cycle. Results show that thermodynamic performances of the system are sensitively influenced by system parameters.
Condensate of a charged boson fluid at non-integer dimensions
Sang-Hoon Kim,Chul Koo Kim,Kyun Nahm
Physics , 2002,
Abstract: Condensate of a charged boson fluid at non-integer dimensions between 2 and 3 is studied. Interaction between particles is assumed to be Coulombic, and Bogoliubov approximation is applied for a weak coupling regime. The condensate and the superfluid fraction at finite temperatures and at non-integer dimensions are calculated. The theoretical results are compared with the superfluid densities of superconducting films, which show a universal splitting behavior. The qualitative similarity between the charged boson fluid and the superconducting films gives a strong clue for the origin of the universality.
Ideal Bose gas in fractal dimensions and superfluid $^4$He in porous media
Sang-Hoon Kim,Chul Koo Kim,Kyun Nahm
Physics , 1999, DOI: 10.1088/0953-8984/11/50/319
Abstract: Physical properties of ideal Bose gas with the fractal dimensionality between D=2 and D=3 are theoretically investigated. Calculation shows that the characteristic features of the specific heat and the superfluid density of ideal Bose gas in fractal dimensions are strikingly similar to those of superfluid Helium-4 in porous media. This result indicates that the geometrical factor is dominant over mutual interactions in determining physical properties of Helium-4 in porous media.
Ground state energy density of a dilute Bose gas in the canonical transformation
Sang-Hoon Kim,Chul Koo Kim,Mukunda P. Das
Physics , 2006,
Abstract: A ground state energy density of an interacting dilute Bose gas system is studied in the canonical transformation scheme. It is shown that the transformation scheme enables us to calculate a higher order correction of order $n a^3$ in the particle depletion and ground state energy density of a dilute Bose gas system, which corresponds to the density fluctuation contribution from the excited states. The coefficient of $n a^3$ term is shown to be $2(\pi - 8/3)$ for the particle depletion, and $16(\pi - 8/3)$ for the ground state energy density.
The Geometry Variation of As-Grown Carbon Coils with Ni Layer Thickness and Hydrogen Plasma Pretreatment
Young-Chul Jeon,Semi Park,Sung-Hoon Kim
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/325827
Abstract:
Relics of cosmological quark-hadron phase transition
Hee Il Kim,Bum-Hoon Lee,Chul H. Lee
Physics , 1999, DOI: 10.1103/PhysRevD.64.067301
Abstract: We propose that the amplified density fluctuations by the vanishing sound velocity effect during the cosmological quark-hadron phase transition lead to quark-gluon plasma lumps decoupled from the expansion of the universe, which may evolve to quark nuggets (QNs). Assuming power-law spectrum of density fluctuations, we investigate the parameter ranges for the QNs to play the role of baryonic dark matter and give inhomogeneities which could affect big-bang nucleosynthesis within the observational bounds of CMBR anisotropy. The QNs can give the strongest constraint ever found on the spectral index.
Non-vanishing Magnetic Flux through the Slightly-charged Kerr Black Hole
Hongsu Kim,Chul Hoon Lee,Hyun Kyu Lee
Physics , 2000, DOI: 10.1103/PhysRevD.63.064037
Abstract: In association with the Blanford-Znajek mechanism for rotational energy extraction from Kerr black holes, it is of some interest to explore how much of magnetic flux can actually penetrate the horizon at least in idealized situations. For completely uncharged Kerr hole case, it has been known for some time that the magnetic flux gets entirely expelled when the hole is maximally-rotating. In the mean time, it is known that when the rotating hole is immersed in an originally uniform magnetic field surrounded by an ionized interstellar medium (plasma), which is a more realistic situation, the hole accretes certain amount of electric charge. In the present work, it is demonstrated that as a result of this accretion charge small enough not to disturb the geometry, the magnetic flux through this slightly charged Kerr hole depends not only on the hole's angular momentum but on the hole's charge as well such that it never vanishes for any value of the hole's angular momentum.
Fluctuation correction to the ground state energy density of a dilute Bose gas in the functional Schr?dinger picture
Sang-Hoon Kim,Hyun Sik Noh,Dae Kwan Kim,Chul Koo Kim,Kyun Nahm
Physics , 1998,
Abstract: A dilute Bose gas system is studied using the functional Schr\"{o}dinger picture theory. The ground state properties are obtained by solving the infinite dimensional Schr\"{o}dinger equation variationally. It is shown that a shifted Gaussian trial wavefunctional enables us to calculate a higher order correction, which corresponds to the fluctuation contribution from the condensate. The obtained term is compared with the quantum correction arising from the low energy $3 \to 3$ scattering.
Large-Scale Production of Microalgal Lipids Containing High Levels of Docosahexaenoic Acid upon Fermentation of Aurantiochytrium sp. KRS101  [PDF]
Won-Kyung Hong, Anna Yu, Baek-Rock Oh, Jang Min Park, Chul Ho Kim, Jung-Hoon Sohn, Akihiko Kondo, Jeong-Woo Seo
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.49A1001
Abstract:

In this study, large-scale production of microalgal lipid containing high levels of docosahexaenoic acid (DHA) by fermentation of Aurantiochytrium sp. KRS101 was performed. The microalgal strain yielded productivity of docosahex-aenoic acid (DHA) productivity of 1.08 and 1.6 g/L/d by fermentation at 300-L and 5000-L scale stirrer-type bioreactor. The productivity was significantly enhanced upto 5.6 g/L/d by fermentation at 6000-L scale airlift-type bioreactor, probably due to the reduced shearing force. The microalgal lipid could be efficiently recovered by safe extraction methods such as ethanol extraction, hot water extraction or supercritical fluid extraction, promising commercial potential of the microalgal DHA-rich lipid in the food and feed industry.

Effect of Mesenchymal Stem Cells Associated to Matrixen on the Erectile Function in the Rat Model with Bilateral Cavernous Nerve Crushing Injury
Kim, Su Jin;Park, Sang Hoon;Sung, Young Chul;Kim, Sae Woong;
International braz j urol , 2012, DOI: 10.1590/1677-553820133806833
Abstract:
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