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Baeck, Kyoung-Koo,Lee, Yoon-Sup Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.6
Procedures to perform reliable relativistic self-consistent-field (RSCF) calculations are described. Using light atoms and molecules, it is demonstrated that the present method always yields correct nonrelativistic limit by employing a sufficiently large value for the speed of light in RSCF calculations. Many problems associated with analytic expansions of the Dirac equations can be computationally avoided by kinetically balancing the basis sets for large and small component spinors. Results of RSCF calculations for Ne, Kr, $H_2$, and LiH indicate very small relativistic effects for these systems as expected. Trends found is these molecules, however, may be useful in understanding relativistic effects for molecules with similar valence electronic structures and heavier atoms.
Baeck, S.,Han, E.,Chung, H.,Pyo, M. Elsevier Sequoia 2011 Forensic science international Vol.206 No.1
The effects of repeated hair washing and a single hair dyeing on concentrations of methamphetamine (MA) and amphetamine (AM) in hair samples of MA addicts were studied. Thirty-one MA positive hair samples collected from male (n=24, 24-51 yrs) and female abusers (n=7, 17-46 yrs) were evaluated for MA and AM concentration's changes after repeated hair washing and a single hair dyeing. Thirty-one MA positive hair samples, no additional treatment hair sample group (NAT), were treated in vitro with liquid soap or three kinds of hair dyes which were black, brown and yellow color hair dye, respectively. Quantitation of AM and MA in hair samples was utilized GC-MS using selected ion monitoring. MA and AM concentrations in NAT were 10.41+/-8.91ng/mg (range 1.50-30.0ng/mg) and 2.24+/-2.75ng/mg (range 0.41-12.90ng/mg). And, their concentrations were decreased about 23.3+/-4.5% (range 16.7-32.8%) in hair repeated washing group (WAS) and 32.6+/-4.82 (22.2-41.9) in three kinds of a single hair dyeing groups in comparison to original concentrations of MA and AM in NAT. A statistically significant difference was found between NAT and WAS or three hair dyeing groups (p<0.01), but not between WAS and three hair dyeing groups, and not between each hair dyeing groups with each three kinds of hair dyes (p>0.05).
Baeck B. Choi,Bethy Kim,Yiqi Chen,유성종,조용현,Peng Jiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The colloidal Langmuir–Blodgett coating process is used to fabricate Au-covered silica sphere monolayer(Aufilm over silica nanosphere (AuFON)) and study the effects of silica diameter on surface plasmonresonance (SPR) sensing sensitivity. The resulting hexagonal close-packed (HCP) monolayers areprepared with silica sphere diameters of 200, 400, 700, and 1000 nm. In SPR sensing applications, theoptical properties of Au-covered silica sphere monolayer are evaluated by measuring normal-incidencereflection spectra and sensing tests. The high sensitivity (nm/RIU) is observed in silica sphere diameter(1000 > 700 > 400 > 200 nm) and plasmon mode (dipole > Fano resonance (FR) > and high order) whilethe highest sensitivity is 968 nm/RIU (dipole mode, 1000 nm of silica sphere diameter). 3-D FiniteDifference Time Domain (FDTD) simulation shows a sensitivity trend similar to the experimental results.
Inverse DVD-R grating structured SPR sensor platform with high sensitivity and figure of merit
Baeck B. Choi,Bethy Kim,Jason Bice,Curtis Taylor,Peng Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The figure of merit (FOM, 1/RIU) 112.34 is achieved in the Au-covered epoxy grating (Au/Epoxy) with theinverse structure of the original track pitch DVD-R. The feasible exfoliation of the cured epoxy resin fromthe Au-covered polycarbonate (PC) gratings (Au/PC) of DVD-R grating creates a narrow deep channelstructure. As well as Au/PC, newly created Au/Epoxy gratings glow beautifully with rainbow-coloredstripes on the surface due to the constructive interference of visible light. The SEM and 3D-AFM imagesshow that the surface distortion of the Au/Epoxy grating is 0.58 (negative) and that of the Au/PC gratingis 0.14 (positive). The Au/Epoxy grating exhibits 872.01 nm/RIU with slightly lower sensitivity than theAu/PC grating (887.59 nm/RIU). However, the Au/Epoxy grating shows a total of 7.76 ± 0.53 nm with up tofull width half maximum (FWHM) for the SPR dip during the detection test, so a high FOM of 112.34 canbe achieved. In addition, the FDTD simulation shows the experimental results as well as the relevantresults of the SPR deep wavelength and FWHM. Finally, the Au/Epoxy grating shows a more pronouncedresonance for methanol concentration measurements than the Au/PC grating due to the high FOM andstrong adhesion between the Au layer and the epoxy substrate.
Baeck, Gun-Wook,Park, Joo-Myun,Hashimoto, Hiroaki The Korean Society for Integrative Biology 2011 Animal cells and systems Vol.15 No.4
Feeding ecology was compared among the three tonguefishes Cynoglossus abbreviatus, C. joyneri and C. robustus, collected from Seto Inland Sea, Japan, from June 2000 to May 2001. They are benthivores, consuming mainly gammarid amphipods, shrimps, crabs, gastropods, bivalves and ophiuroids. C. abbreviatus consumed greater proportions of ophiuroids whereas C. joyneri and C. robustus ate more amphipods and shrimps. While C. abbreviatus consumed mostly ophiuroids in all size classes, the diets of C. joyneri and C. robustus showed ontogenetic changes in feeding habits; smaller individuals of C. joyneri and C. robustus consumed gammarid amphipods, whereas larger C. joyneri ate shrimps and gastropods, and larger C. robustus fed mainly on gastropods, crabs, bivalves and polychaetes. Cluster analysis based on diet similarities emphasized that the three Cynoglossus species could be categorized on a size-related basis into three feeding groups: smaller C. joyneri and C. rubustus (<25 cm TL) could be classified as group A, and the larger of them (>25 cm TL) as group B, whereas C. abbreviatus was categorized as group C. This means that some degree of resource partitioning can occur among the three Cynoglossus species. The seasonal changes in the diets were also significant for the three Cynoglossus species.
Baeck, Gun-Wook,Kim, Ju-Won,Kim, Ki-Hyuk,Jun, Kwan-Yong,An, Geun-Hee,Park, Chan-Il The Korean Society of Fish Pathology 2008 한국어병학회지 Vol.21 No.2
We constructed a black rockfish (Sebastes schlegeli) leukocyte cDNA library and a total of 386 expressed sequence tag (EST) clones were generated. Gene annotation procedures and homology searches of the sequenced ESTs were locally done by BLASTX for amino acid similarity comparisons. Of the 386 EST clones, 199 different ESTs showed significant homology to previously described genes while 97 ESTs were unidentified, hypothetical, or unnamed proteins. Encoding 38 different sequences were identified as putative bio-defense genes or genes associated with immune response.
Phase Transformation through Metastable Structures in Atomically Controlled Se/Sb MultiLayers
Baeck, Ju Heyuck,Kim, Tae Hyeon,Choi, Hye Jin,Jeong, Kwang Ho,Cho, Mann-Ho American Chemical Society 2011 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.115 No.27
<P>Multilayer films composed of individual layers of [Sb(8.84 Å)/Se(12.6 Å)](Sb4Se6), [Sb(8.84 Å)/Se(7.2 Å)](Sb4Se4), and [Sb(15.4 Å)/Se(7.2 Å)](Sb6Se4) were synthesized using effusion cells controlled at the subatomic scale. After an annealing process, the Sb4Se6 multilayered film with an Sb<SUB>2</SUB>Se<SUB>3</SUB> orthorhombic structure had a high resistance and a clean valence band edge similar to that for a band shape of a semiconductor, whereas the Sb6Se4 film with an Sb rhombohedral structure and an Sb<SUB>2</SUB>Se<SUB>3</SUB> orthorhombic structure had a low resistance and a band tail that originated from their metallic characteristics in the near Fermi level. In the case of Sb4Se4, a metastable Sb<SUB>4</SUB>Se<SUB>4</SUB> monoclinic structure was induced at an annealing temperature of 200 °C because of the unstable, local, and anisotropic distribution of each element in the vertical direction of multilayer films with a specific stoichiometry. Moreover, the nonbonding states originating from a band-gap state were generated in the film with a metastable structure. When the annealing process was conducted at 256 °C, the linear diffusion of elements in the film induced the most stable crystal structure with a stable stoichiometry. That is, the multilayered Sb4Se4 film underwent a steplike resistance change through a two-level phase change process. The findings indicate that a multilayered system with an atomically controlled thickness can be utilized to control the electrical resistance, metastable phase formation, and the valence band structure in an Sb–Se alloy system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-27/jp202433s/production/images/medium/jp-2011-02433s_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp202433s'>ACS Electronic Supporting Info</A></P>