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Search Results: 1 - 10 of 3757 matches for " Jae-Ku Oem "
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Phylogenetic analysis and characterization of Korean orf virus from dairy goats: case report
Jae-Ku Oem, In-Soon Roh, Kyung-Hyun Lee, Kyoung-Ki Lee, Hye-Ryoung Kim, Young-Hwa Jean, O-Soo Lee
Virology Journal , 2009, DOI: 10.1186/1743-422x-6-167
Abstract: Contagious ecthyma (contagious pustular dermatitis; orf) is a common epitheliotrophic viral disease of sheep, goats, and wild ruminants and is characterized by the formation of papules, nodules, or vesicles that progress into thick crusts or heavy scabs on the lips, gingiva, and tongue. Orf virus is an oval, enveloped virus containing dsDNA genome within the genus Parapoxvirus, family Poxviridae [1]. The genus also includes pseudocowpox virus (PCPV) and bovine papular stomatitis virus (BPSV) in cattle and parapoxvirus of red deer in New Zealand. Zoonotic infection with orf virus is characterized by nodular and papillomatous lesions mainly on the hands, face, and mouth [2,3].To reveal the genetic variation and characterization of parapoxvirus, the major virus envelope protein B2L and virus interferon resistance (VIR) genes have been used recently [4-8]. Orf virus infection has been diagnosed occasionally in Korea since the outbreak of orf was reported clinically in the 1990s. Although a few studies have been conducted, molecular epidemiology based on gene sequences of orf virus has not been performed because the population of sheep and goats is low in Korea. In the present study, orf virus infection in dairy goats was identified by clinical diagnosis and PCR. The complete B2L and VIR genes were sequenced, and their phylogenetic trees were constructed.In April 2009, an exanthematic outbreak occurred in a farm with 400 dairy goats in the Chungbuk province. Sixty dairy goats presented with wart-like lesions on the lips, tongue, and around the anus (Fig. 1A and 1B). The clinical diagnosis was contagious ecthyma. Morbidity was 15% (60/400), and goats of all the ages ranging from 2 weeks to 1 month were affected. Dried scabs collected from affected goats were stored in a -70°C freezer until the samples were used for further study.The tissue samples were either fixed in 10% buffered formalin for histological examination, or were homogenized mechanically in PBS in a tube usi
Imaging ultrafast carrier transport in nanoscale devices using femtosecond photocurrent microscopy
B. H. Son,Jae-Ku Park,J. T. Hong,Ji-Yong. Park,Soonil. Lee,Y. H. Ahn
Physics , 2014, DOI: 10.1021/nn5042619
Abstract: One-dimensional nanoscale devices, such as semiconductor nanowires (NWs) and single- walled carbon nanotubes (SWNTs), have been intensively investigated because of their potential application of future high-speed electronic, optoelectronic, and sensing devices. To overcome current limitations on the speed of contemporary devices, investigation of charge carrier dynamics with an ultrashort time scale is one of the primary steps necessary for developing high-speed devices. In the present study, we visualize ultrafast carrier dynamics in nanoscale devices using a combination of scanning photocurrent microscopy and time- resolved pump-probe techniques. We investigate transit times of carriers that are generated near one metallic electrode and subsequently transported toward the opposite electrode based on drift and diffusion motions. Carrier dynamics have been measured for various working conditions. In particular, the carrier velocities extracted from transit times increase for a larger negative gate bias, because of the increased field strength at the Schottky barrier.
Effect of Curing Poly(p-Phenylene Sulfide) on Thermal Properties and Crystalline Morphologies  [PDF]
Sungho Lee, Do-Hwan Kim, Jae-Ha Park, Min Park, Han-Ik Joh, Bon-Cheol Ku
Advances in Chemical Engineering and Science (ACES) , 2013, DOI: 10.4236/aces.2013.32017

Commercial poly(p-phenylene sulfide) (PPS) was thermally cured, which resulted in an increase of molecular weight due to cross-linking. Non-isothermal crystallization studies of samples cured for up to 7 days at 250?C showed a monotonous increase of crystallization temperature compared to pure PPS. However, a further increase of curing time decreased the crystallization temperature. The change in the half-crystallization time (t1/2) was similar to the crystallization temperature. Thus, the cross-linking of PPS affected crystallization behaviors significantly. To a certain extent, crosslinks acted as nucleation agents, but excessive cross-linking hindered the crystallization. Morphologies observed by polarized optical microscopy suggested that thermal curing for as little as 1 day contributed to the spherulitic structure having a smaller size, that was not observed with pure PPS.

Visible injury and growth inhibition of black pine in relation to oxidative stress in industrial areas
Sim-Hee Han,Du-Hyun Kim,Ja-Jung Ku,Jae Kyung Byun
Journal of Ecology and Field Biology , 2010,
Abstract: The objective of our study was to investigate the major reasons for the different growth and visible injury on theneedles of black pine growing in Ulsan and Yeocheon industrial complex areas, South Korea. After 12 years of growth,we collected climatic and air pollutant data, and analyzed soil properties and the physiological characteristics of blackpine needles. Annual and minimum temperatures in Ulsan were higher than those in Yeocheon from 1996 to 2008.Ozone (O3) was the pollutant in greatest concentration in Yeocheon, and whereas the SO2 concentration in most areasdecreased gradually during the whole period of growth, SO2 concentration in Yeocheon has increased continuously since1999, where it was the highest out of four areas since 2005. Total nitrogen and cation exchange capacity in Yeocheon soilwere significantly lower than those of Ulsan. The average growth of black pine in Yeocheon was significantly smallerthan that in Ulsan, and the growth of damaged trees represented a significant difference between the two sites. Photosyntheticpigment and malondialdehyde content and antioxidative enzyme activity in the current needles of black pinein Yeocheon were not significantly different between damaged and healthy trees, but in 1-year-old needles, there weresignificant differences between damaged and healthy trees. In conclusion, needle damage in Yeocheon black pine can beconsidered the result of long-term exposure to oxidative stress by such as O3 or SO2, rather than a difference in climaticcondition or soil properties, and the additional expense of photosynthate needed to overcome damage or alleviate oxidativestress may cause growth retardation.
Renormalization of Black Hole Entropy
Sang Pyo Kim,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 1999,
Abstract: We review the renormalization of one-loop effective action for gravity coupled to a scalar field and that of the Bekenstein-Hawking entropy of a black hole plus the statistical entropy of the scalar field. It is found that the total entropy of the black hole's geometric entropy and the statistical entropy yields the renormalized Bekenstein-Hawking area-law of black hole entropy only for even dimensional Reissner-N\"{o}rdstrom (Schwarzschild) black holes. We discuss the problem of the microscopic origin of black hole entropy in connection with the renormalization of black hole entropy.
Quantum Creation of Black Hole by Tunneling in Scalar Field Collapse
Dongsu Bak,Sang Pyo kim,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 1999, DOI: 10.1103/PhysRevD.60.064005
Abstract: Continuously self-similar solution of spherically symmetric gravitational collapse of a scalar field is studied to investigate quantum mechanical black hole formation by tunneling in the subcritical case where, classically, the collapse does not produce a black hole.
Renormalized Thermodynamic Entropy of Black Holes in Higher Dimensions
Sang Pyo Kim,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 1996, DOI: 10.1103/PhysRevD.55.2159
Abstract: We study the ultraviolet divergent structures of the matter (scalar) field in a higher D-dimensional Reissner-Nordstr\"{o}m black hole and compute the matter field contribution to the Bekenstein-Hawking entropy by using the Pauli-Villars regularization method. We find that the matter field contribution to the black hole entropy does not, in general, yield the correct renormalization of the gravitational coupling constants. In particular we show that the matter field contribution in odd dimensions does not give the term proportional to the area of the black hole event horizon.
Remarks on Renormalization of Black Hole Entropy
Sang Pyo Kim,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 1996, DOI: 10.1142/S0217751X97002802
Abstract: We elaborate the renormalization process of entropy of a nonextremal and an extremal Reissner-Nordstr\"{o}m black hole by using the Pauli-Villars regularization method, in which the regulator fields obey either the Bose-Einstein or Fermi-Dirac distribution depending on their spin-statistics. The black hole entropy involves only two renormalization constants. We also discuss the entropy and temperature of the extremal black hole.
The Effect of Brick Walls on the Black Hole Radiation
Sang Pyo Kim,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 1996,
Abstract: In order to understand the physical effect of the brick wall boundary condition, we compute the distribution of the zero-point energy of the massless scalar fields minimally coupled to the Schwarzschild and Reissner-Nordstr\"{o}m black hole backgrounds. We find that the black hole radiation spectrum depends on the positions of the brick wall and the observer, and reveals the interference effect due to the reflected field by the brick wall.
Noncommutative Field Theories and Smooth Commutative Limits
Dongsu Bak,Sung Ku Kim,Kwang-Sup Soh,Jae Hyung Yee
Physics , 2000, DOI: 10.1103/PhysRevD.63.047701
Abstract: We consider two model field theories on a noncommutative plane that have smooth commutative limits. One is the single-component fermion theory with quartic interaction that vanishes identically in the commutative limit. The other is a scalar-fermion theory, which extends the scalar field theory with quartic interaction by adding a fermion. We compute the bound state energies and the two particle scattering amplitudes exactly.
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