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CALIBRATION OF STELLAR PARAMETERS OF 85 PEG SYSTEM
Bach, Kiehunn,Kim, Yong-Cheol,Demarque, Pierre The Korean Space Science Society 2007 Journal of Astronomy and Space Sciences Vol.24 No.1
We have investigated the evolutionary status of 85 Peg within the framework of standard evolutionary theory. 85 Peg has been known to be a visual and spectroscopic binary system in the solar neighborhood. In spite of the accurate information of the total mass (${\sim}1.5M_{\odot}$) and the distance (${\sim}12pc$) from the HIPPARCOS parallax, it has been undetermined an individual mass, therefore the evolved status of the system. Moreover, the coupled uncertainties of chemical composition and age, make matters worse in predicting an evolutionary status of the system. Nevertheless, we computed the various possible models for 85 Peg, and then calibrated stellar parameters by adjusting to the recent observational data. Our modelling computation has included recently updated input physics and stellar theory such as opacity, equation of state, and chemical diffusion. Through a statistical assessment, we have derived a confident parameter set as the best solution which minimized $X^{2}$ within the observational error domain. Most of all, we found that 85 Peg is not a binary system but a triple system with an unseen companion 85 Peg $B_{b}\;{\sim}0.16M_{\odot}$. The aim of the present paper is (1) to provide a complete modelling of the stellar system based on the evolutionary theory, and (2) to constrain the physical dimensions such as mass, metallicity and age.
Bach, Emmon 서울대학교 어학연구소 1981 語學硏究 Vol.17 No.1
Last year at the University of Wisconsin in Milwaukee there was a conference about the theory of syntax. Fourteen different theories of syntax wre discussed at this conference. The aim of the conference was to see if there could be some measure of agreement about syntactic theory. I did not attend the conference but I am told that at the end of the conference there were still fourteen theories of syntax, maybe even more. I like to look behind disagreements about details and notice agreements that were sometimes apparent in the heat of discussions and battle. I don't know about Korean linguists but in America linguists love to argue, and it is very hard for many linguists to say, "Yes", when someone says, "Well, you really agree with me, don't you?" Then they usually say, "No." There is a story about Noam Chomsky, who, I think, is perhaps most argumentative of all. He was giving a lecture at a university in Canada and someone in the audience got up and said, "Well, I agree with you because of this and this...," and Noam Chomsky immediately said, "No, you don't."
Rate-estimation-based relay selection scheme for large-scale wireless networks
Bach Long, Nguyen,Nhon, Tran,Kim, Dong-Seong IET 2016 IET COMMUNICATIONS Vol.10 No.12
<P>This study proposes rate-estimation-based relay selection scheme (RERSS) for large-scale wireless networks (LSWNs) that effectively distributes traffic of packets from a source to a sink. In an LSWN, direct data transmission from a source and a sink has been becoming a challenge. This is because of longer communication distance and more interference caused by more adjacent nodes. Hence, in order to transmit data packets to the sink, the source exploits neighbour nodes as relay nodes around it to forward packets through single-hop or multi-hop until reaching the sink. Different from the conventional cooperative relaying scheme, RERSS introduces a rate-estimation parameter A to select the forwarder for relaying messages. After determining A value of each neighbour relay node using a link rate stored in the advertising packet, the relay node whose A value meets the requirement of RERSS can be qualified as a forwarder of the source or the other relay node. Simulation results indicate the potential to not only increase throughput but also decrease energy consumption and end-to-end delay.</P>
Synthesis and biological activity of new phthalimides as potential anti-inflammatory agents
Bach, D.H.,Liu, J.Y.,Kim, W.K.,Hong, J.Y.,Park, S.H.,Kim, D.,Qin, S.N.,Luu, T.T.T.,Park, H.J.,Xu, Y.N.,Lee, S.K. Elsevier/Pergamon 2017 Bioorganic & medicinal chemistry Vol.25 No.13
The overproduction of nitric oxide (NO) plays an important role in a variety of pathophysiological processes, including inflammation. Therefore, the suppression of NO production is a promising target in the design of anti-inflammatory agents. In the present study, a series of phthalimide analogs was synthesized, and their anti-inflammatory activities were evaluated using lipopolysaccharide (LPS)-stimulated NO production in cultured murine macrophage RAW264.7 cells. A structure-activity relationship study showed that the free hydroxyl group at C-4 and C-6 and the bulkiness of the N-substituted alkyl chain are associated with biological activity. Among the series of phthalimide derivatives, compound IIh exhibited potent inhibitory activity, with an IC<SUB>50</SUB> value of 8.7@?g/mL. Further study revealed that the inhibitory activity of compound IIh was correlated with the down-regulation of the mRNA and protein expression of LPS-stimulated inducible nitric oxide synthase (iNOS). Compound IIh also suppressed the induction of the pro-inflammatory cytokines tumor necrosis factor-α and interleukin-1β in LPS-stimulated RAW 264.7 cells. The anti-inflammatory activity of compound IIh was also found to be associated with the suppression of the Toll-like receptor (TLR)4 signaling pathway by down-regulating the activation of interferon regulatory factor 3 (IRF-3) and interferon-β and signal transducer expression. These findings demonstrate that novel phthalimides might be potential candidates for the development of anti-inflammatory agents.
EVOLUTIONARY STATUS OF 85 PEGASI
Bach, K.,Lee, J.,Demarque, P.,Kim, Y.-C. IOP Publishing 2009 The Astrophysical journal Vol.703 No.1
<P>We have investigated the evolutionary status of the visual binary 85 Peg (HD 224930) using a high-resolution spectroscopic analysis and the astrometric calibration of the stellar parameters. In spite of well-determined stellar parameters from HIPPARCOS astrometry and from spectroscopy, 85 Peg has for a long time revealed peculiar properties when attempts have been made to combine an evolutionary model with observation. There has been a chronic problem of the mass ratio of the two components when comparing 85 Peg's dynamical properties to the photometric magnitude difference. Moreover, 85 Peg has been suspected to have unique characteristics in its chemical composition. In order to determine accurate spectroscopic abundances, we have obtained high-resolution echelle spectra for 85 Peg. From our elemental analysis, we found that 85 Peg is alpha-enhanced with respect to the scaled solar abundance by a factor of 2. We then produced, within the framework of the standard stellar theory, grids of stellar model using the most recent observational results. To avoid many-fold degeneracy among physical quantities, a statistical minimization test was carried out between theoretical model grids. Enforcing consistency between the modeling and statistical constraints, we derived a reliable set of physical parameters and confirmed the trinarity of the system. In the context of asteroseismology, the theoretical frequency spectrum of 85 Peg was calculated. 85 Peg A is expected to have a first order spacing Delta nu similar to 165 mu Hz at the reference frequency nu(0) = 790 mu Hz.</P>