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A Nonlinear Theory for the Lotka-Volterra Model with an External lnput
Mino Yang,Sangyoub Lee,Seong Keun Kim,Kook Joe Shin,Moon Hee Ryu,Song Hi Lee,Dong J. Lee Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.5
A new perturbation theory called the star expansion method is used to obtain an approximate nonlinear solution of the Lotka-Volterra model under the influence of some kinds of external input. The effects of nonlinearity, amplitude and frequency of the external input on the chemical oscillations in the model are evaluated by taking specific values for the model parameters, and the results are discussed in detail.
Distance and Properties of NGC 4993 as the Host Galaxy of the Gravitational-wave Source GW170817
Im, Myungshin,Yoon, Yongmin,Lee, Seong-Kook J.,Lee, Hyung Mok,Kim, Joonho,Lee, Chung-Uk,Kim, Seung-Lee,Troja, Eleonora,Choi, Changsu,Lim, Gu,Ko, Jongwan,Shim, Hyunjin American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.849 No.1
SURVEY DESIGN FOR SPECTRAL ENERGY DISTRIBUTION FITTING: A FISHER MATRIX APPROACH
Acquaviva, Viviana,Gawiser, Eric,Bickerton, Steven J.,Grogin, Norman A.,Guo, Yicheng,Lee, Seong-Kook IOP Publishing 2012 The Astrophysical journal Vol.749 No.1
<P>The spectral energy distribution (SED) of a galaxy contains information on the galaxy's physical properties, and multi-wavelength observations are needed in order to measure these properties via SED fitting. In planning these surveys, optimization of the resources is essential. The Fisher Matrix (FM) formalism can be used to quickly determine the best possible experimental setup to achieve the desired constraints on the SED-fitting parameters. However, because it relies on the assumption of a Gaussian likelihood function, it is in general less accurate than other slower techniques that reconstruct the probability distribution function (PDF) from the direct comparison between models and data. We compare the uncertainties on SED-fitting parameters predicted by the FM to the ones obtained using the more thorough PDF-fitting techniques. We use both simulated spectra and real data, and consider a large variety of target galaxies differing in redshift, mass, age, star formation history, dust content, and wavelength coverage. We find that the uncertainties reported by the two methods agree within a factor of two in the vast majority (similar to 90%) of cases. If the age determination is uncertain, the top-hat prior in age used in PDF fitting to prevent each galaxy from being older than the universe needs to be incorporated in the FM, at least approximately, before the two methods can be properly compared. We conclude that the FM is a useful tool for astronomical survey design.</P>
Hong, Hyun-Gi,Kim, S.-S.,Kim, D.-Y.,Lee, Takhee,Kim, Kyoung-Kook,Song, June-O.,Cho, J. H.,Seong, Tae-Yeon WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.3
<P>The effect of rapid-thermal-annealing on the performance of near-UV GaN-based light-emitting diodes (LEDs) fabricated with nano-patterned p-type electrodes has been investigated. One-dimensional (1-D) nano-patterns were formed on Cu-doped indium oxide (CIO)/indium tin oxide (ITO) p-electrode by sur- face relief grating and dry etching techniques. After the nano-patterning, some of the samples are rapid-thermal-annealed at 530 and 630 °C in either air or nitrogen ambient. LEDs made with samples annealed 530 °C show much better electrical characteristics as compared to unannealed samples. In particular, LEDs with samples annealed 530 °C in air show higher output power (at 20 mA) and much reduced leakage current as compared to LEDs with unannealed samples. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Group A-beta Hemolytic Streptococci에 의한 소아 인두편도염에 있어서 Cefprozil의 항균력과 임상적 및 세균학적 효과에 관한 연구
김민우,안영민,장성희,마상혁,안병문,김종덕,이종국,김미란,장진근,박진영,배종우,차성호,Kim, Min-Woo,Ahn, Young-Min,Jang, Seong-Hee,Ma, Sang-Hyuk,Ahn, Byung-Moon,Kim, Jong-Duk,Lee, Jong-Kook,Kim, Mi-Lan,Chang, Jin-Kun,Park, Jin-Young,Bae, J 대한소아감염학회 2001 Pediatric Infection and Vaccine Vol.8 No.2
최근 소아의 인두염 및 인두편도염에서 EM-resistant group A streptococci가 15~40%까지 보고가 되고 있으며, 같은 계통의 macrolide제제들의 대한 내성도 점차 증가하고 있는 양상이 나타나고 있다. 따라서 세균성 인두편도염이 의심되는 환아의 치료에 있어서 경구용 항생제를 선택할 때는 항생제에 대한 내성과 경제성 및 환아의 순응도를 고려하여 항생제를 선택하여야 하겠다. Objective : To determine the clinical and bacteriologic efficacy and safety of Cefprozil in acute pharyngitis and pharyngotonsilitis caused by Group A beta hemolytic streptococci in pediatric patients. Methods : Any patient of 3 to 14 age who visited the hospitals enrolled in this study with the signs and symptoms of pharyngitis or pharyngotonsilitis since July, 2000 to March, 2001, was taken throat culture and given Cefprozil(15 mg/kg/day, in two divided doses) for 10 days. 138 patients of whom showed positive culture results were followed up for the signs and symptoms during the treatment to determine clinical efficacy. Any undesirable effect was reported to determine the safety of the drug. Follow up cultures were done at the end of the study and bacteriologic efficacy was determined. Results : 138 of 256 patients who visited the hospitals with the signs and symptoms of pharyngitis or pharyngotonsilitis showed positive growth on throat culture. Mean age of the patients was $6.1{\pm}2.5$ and males and females were equally numbered. 129 of them complained fever on the first visit and 112(86.6%) of them were improved at the end of the study. Cervical lymphadenitis was seen in 58 patients and 44(75.9%) of them improved at the end of the study. Exudative pharyngitis was seen in 96 patients and 81(84.3%) of them improved. The overall clinical effcacy based on this results showed that 110(79.7%) of the patients were cured and 17(12.3%) of them improved. On the cultures and bacteriologic efficacy, 24.6% of them showed documented eradication after treatment and 62.3% of them showed presumptive eradication. Sensitivity test was done by agar dilution method and Cefprozil showed 100% sensitivity. Erythromycin, Clarithromycin and azithromycin showed 87%, 85.6 %, 90.6% sensitivity, respectively. Conclusion : Cefprozil is proved to be effective in controlling group A streptococcal pharyngitis and pharyngotonsilitis in children and showed good sensitivity. Cefprozil can be used as an effective oral cephalosporin in the patients showing penicillin hypersensitivity or patients who other drugs have failed.