쉬테판 게오르게의 "Wir schreiten auf und ab im reichen flitter" : 서정적 텍스트의 분석체계에 대하여

Bruno Roßbach 韓國獨語獨文學會 1998 獨逸文學 Vol.68 No.1

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>

Calibration of 85 Pegasi

Bach Kiehunn,Kim Yong-Cheol,Demarque Pierre 한국천문학회 2006 天文學會報 Vol.31 No.2

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>

Growing Poly(methyl methacrylate) Chains from the Surface of Hydroxyapatite Nanocrystals via Surface-Initiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Bach, Long Giang,Quynh, Bui Thi Phuong,Ho, Van Thi Thanh American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.6

Long noncoding RNAs in cancer cells

Bach, Duc-Hiep,Lee, Sang Kook Elsevier 2018 Cancer letters Vol.419 No.-

<P><B>Abstract</B></P> <P>Long noncoding RNA (lncRNA) has recently been investigated as key modulators that regulate many biological processes in human cancers via diverse mechanisms. LncRNAs can interact with macromolecules such as DNA, RNA, or protein to exert cellular effects and to act as either tumor promoters or tumor suppressors in various malignancies. Moreover, the aberrant expression of lncRNAs may be detected in multiple cancer phenotypes by employing the rapidly developing modern gene chip technology and bioinformatics analysis. Herein, we highlight the mechanisms of action of lncRNAs, their functional cellular roles and their involvement in cancer progression. Finally, we provide an overview of recent progress in the lncRNA field and future potential for lncRNAs as cancer diagnostic markers and therapeutics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> lncRNAs might act as tumor promoters or tumor suppressors in cancer development. </LI> <LI> lncRNAs are suggested as diagnostic and prognostic markers in cancer progression. </LI> <LI> lncRNAs are key regulators of pathways involving each of the hallmarks of cancer. </LI> </UL> </P>

A facile strategy towards the encapsulation of TiO2 nanoparticles with Poly(N-vinylcarbazole) through esterification

Bach, Long Giang,Cao, Xuan Thang,Quynh, Bui Thi Phuong,Ho, Van Thi Thanh,Lim, Kwon Taek Informa UK (TaylorFrancis) 2017 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.644 No.1

<P>In this study, a facile method for synthesis of conducting polymer/inorganic oxide hybrid nanocomposites, the poly(N-vinylcar bazole)/Titanium Dioxide (PVK-g-TiO2), was successfully developed via direct facile esterification reaction under extremely mild conditions. The TiO2 nanoparticles (TiO2 NPs) were first modified by 3-glycidoxypropyl trimethoxysilane in order to prepare the epoxy groups functionalized TiO2 NPs, followed by refluxing with ethanol solution of hydrochloric acid to convert the epoxy groups into alkyl-hydroxyl units. A sufficient amount of PVK was then grafted onto the as-modified TiO2 NPs via esterification reaction between the alkyl-hydroxyl units at the nanoparticle surface and the carboxyl-terminated PVK chains. Fourier transform infrared spectroscopy, Energy dispersive X-Ray, X-ray diffraction and thermogravimetric analysis were used to study the chemical and physical properties in surface functionalities.</P>

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.

New therapeutic techniques and strategies in pulmonary rehabilitation

Bach, John R.,Lee, Hang J Yonsei University, College of Medicine 1993 Yonsei medical journal Vol.34 No.3

Process modeling and optimization for torrefaction of forest residues

Bach, Quang-Vu,Skreiberg, Øyvind,Lee, Chul-Jin Elsevier 2017 ENERGY Vol.138 No.-

<P><B>Abstract</B></P> <P>This work aims to build a comprehensive biomass torrefaction model, which can provide a wide range of information essential for industrialization and commercialization of the process. Norwegian forest residue (birch branches) was chosen as feedstock. The model is capable of presenting detailed distributions of main and by-products from the torrefaction process. In addition, important fuel properties (ultimate analysis and heating value) of the main solid product after torrefaction can be predicted. The model is validated and simulation results show good agreement with available experimental data in the literature. Reduction in mass and energy yields as well as improvement in heating value of torrefied biomass with increasing torrefaction temperature are observed. Trends for carbon, oxygen and hydrogen contents are also consistent with other experimental works. Moreover, overall energy consumption and process energy efficiency can be estimated from the model. It reveals that drying accounts for 76–80% of the total heat demand. Furthermore, the process energy efficiency reduces with increasing temperature, thus torrefaction at high temperatures is not advisable. More importantly, process optimization shows that optimal conditions for torrefaction of birch branches are 30 min holding time and a temperature between 275 and 278 °C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Completed torrefaction model has been built in the Aspen Plus and validated by experimental data. </LI> <LI> The model is capable of providing the distributions of both the torrefied biomass and by-products. </LI> <LI> The model reveals that drying accounts for 76–80% of the total heat demand. </LI> <LI> A temperature within 275–278 °C is optimal for a torrefaction time of 30 min for birch branches. </LI> </UL> </P>