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ADVANCES IN CIRCUMSTELLAR MEDIUM EVOLUTION
Garcia-Segura, Guillermo The Korean Astronomical Society 2007 Journal of The Korean Astronomical Society Vol.40 No.4
We discuss recent advances in hydrodynamical computations of the circumstellar medium, which are useful to understand some features observed in long gamma ray bursts.
SUPERBUBBLES AS SPACE BAROMETERS
GARCIA-SEGURA G.,OEY M. S. The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.4
High ambient interstellar pressure is suggested as a possible factor to explain the ubiquitous ob-served growth-rate discrepancy for supernova-driven super bubbles and stellar wind bubbles. Pressures of P / k ${\~} 10^5\;cm^{-3}$ K are plausible for regions with high star formation rates, and these values are intermediate between the estimated Galactic mid-plane pressure and those observed in starburst galaxies. High-pressure components also are commonly seen in Galactic ISM localizations. We demonstrate the sensitivity of shell growth to the ambient pressure, and suggest that super bubbles ultimately might serve as ISM barometers.
Cesar Segura(시저웨슬리),K Kang(강경목),K Seol(설경은),J Koh(고진환) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Several techniques for radiation pattern reconstruction to obtain free-space antenna radiation pattern are Time Reversal algorithm, Spherical Waves decomposition, FFT, matrix Pencil, Chebyshev polynomials and Hilbert Transform. These methods are a set of algorithms that when implemented avoid the use of anechoic chamber which is a standard in communication equipment certification. The objective of this paper is to investigate Impulse Response methodology for obtaining 3D free-space results from non-anechoic measurements. Two antenna configurations are studied to see effects of walls and floor specular reflections. Three standard test antennas (AUT) are simulated: Horn, Yagi and Helical. Fingerprints and pattern error show reconstruction accuracy of 3D Impulse Response over FFT method.
SUPERBUBBLES AS SPACE BAROMETERS
G. GARCIA-SEGURA,M. S. OEY 한국천문학회 2004 Journal of The Korean Astronomical Society Vol.37 No.5
High ambient interstellar pressure is suggested as a possible factor to explain the ubiquitous ob-served growth-rate discrepancy for supernova-driven superbubbles and stellar wind bubbles. Pressuresof P/k~ 10^5 cm^-3 K are plausible for regions with high star formation rates, and these values areintermediate between the estimated Galactic mid-plane pressure and those observed in starburst galax-ies. High-pressure components also are commonly seen in Galactic ISM localizations. We demonstratethe sensitivity of shell growth to the ambient pressure, and suggest that superbubbles ultimately mightserve as ISM barometers.
Saul Serna Segura,Won Dong Kim 지역사회학회 2017 지역사회학 Vol.18 No.2
According to the Korean Ministry of Justice, the number of resident foreigners in South Korea topped the two million mark as of June 2016, accounting for 3.4 percent of the total population. Statistics show that South Korea might now be regarded as early stage of a multicultural society. We analyze how Korean Christian pastors and Protestant churches respond to this growing ethnic and cultural diversity. The literature discusses two general models: advocacy and homogeneous. In the advocacy model, church-based NGOs promote migrant rights and welfare in Korea. In the homogeneous model (building on the homogeneous-unit principle), churches offer separate services for migrants in terms of both language and culture. The advocacy model is criticized as paternalistic and the homogeneous model as separatist. In the past, the first model was popular, but now the second model is the prevailing one to form Korean multicultural congregations. We propose the use of an emerging third model called as the bridging model, which actively links ethnic-cultural divisions through a shared religious identity. We apply the homogeneous and bridging models to two small, multiethnic churches in Korea. River church offers monolingual (English) worship for persons relatively fluent in (or actively learning) the English language. Light church offers bilingual (English/Korean) service and welcomes speakers of either language. The potential reach of River is restricted, whereas Light’s potential includes nearly the entire population of South Korea. In the Korean context, the bridging model shows both higher challenges and more benefits for church members, and for the integration of foreign residents into the host society.
César Vargas-Segura,Emmanuel López-Gamboa,Emanuel Araya-Valverde,Marta Valdez-Melara,Andrés Gatica-Arias 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.5
Coffee (Coffea arabica L.) is threatened by biotic and abiotic stresses. Nevertheless, the breeding of Arabica coffee is restricted due to its low genetic diversity. Crop improvement via mutagenesis represents an alternative for increasing genetic variability and facilitating breeding. In this sense, coffee seeds cv. Catuaí were treated for 8 h with a solution of sodium azide (NaN3) (0, 50, 75, 100, and 125 mM) and ethyl methane sulfonate (EMS) (0, 80, 160, 240, 320, and 400 mM). The genetic variability induced in coffee plants after mutagenic treatment with sodium azide was determined by RAPD and AFLP analyses. As the concentration of applied NaN3 and EMS increased, the germination, seedling height, and root length decreased. The LD50 values for NaN3 and EMS were between 50-75 mM and 160-240 mM, respectively. For the 12 RAPD primers evaluated, a total of 46 fragments were obtained of which 34 were polymorphic bands (74%). The amplification with six AFLP selective primer combinations allowed the identification of 36 polymorphisms (17.8%). The analysis revealed that both NaN3 and EMS induced variability within the DNA regions amplified with AFLP and RAPD markers. Finally, under field conditions, significant differences were noticed with respect to plant height, number of nodes in the orthotropic stem, and number of branches of the M1 mutant (NaN3-treated) plants compared to the non-mutant plants. Optimal conditions for NaN3 and EMS mutagenesis using seeds were determined and the optimized conditions have been used to generate a NaN3 mutant M1 coffee var. Catuaí population.