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Maturation and Spawning of Robust Tonguefish (Cynoglossus robustus (Soleidae; Teleostei)
Baeck, Gun Wook,Kim, Jae Won 한국수산학회 2004 Fisheries and Aquatic Sciences Vol.7 No.3
We examined the ovaries of 312 robust tonguefish (Cynoglossus robustus) collected each month from January to December 2001, off the coast of Yeosu, Korea.The samples were used to investigate robust tonguefish reproductive activity. Monthly changes in the gonadosomatic indexindicated that spawning peaked between June and August. Fish size at first spawning was 15-19 cm total length (TL). Over 50% of female fish 25-29 cm TL were sexually mature, and this rose to 100% for female fish 35-39 cm TL. The tonguefish spawned four or more times during the spawning season. Most females commenced spawning in their second year. The relationship between total length (cm TL) and fecundity (F) was F=528646Ln(TL)-1E+06.
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.
Electronic Structure of Te/Sb/Ge and Sb/Te/Ge Multi Layer Films Using Photoelectron Spectroscopy
Baeck, Ju Heyuck,Ann, Young-kun,Jeong, Kwang-Ho,Cho, Mann-Ho,Ko, Dae-Hong,Oh, Jae-Hee,Jeong, Hongsik American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.38
<P>Te/Sb/Ge and Sb/Te/Ge multilayer films with an atomically controlled interface were synthesized using effusion cell and e-beam techniques. The layers interacted during the deposition, resulting in films composed of Sb-Te+Sb-Sb/Ge and Sb/Sb-Te/Ge-Te/Ge respectively. Atomic diffusion and chemical reactions in films during the annealing process were investigated by photoemission spectroscopy. In the case of Te/Sb/Ge, Ge diffused into the Sb-Te region released Sb in Sb-Te bonds and interacted with residual Te, resulting in a change in valence band line shape, which was similar to that of a Ge(1)Sb(2)Te(4) crystalline phase. The Ge-Sb-Te alloy underwent a stoichiometric change during the process, resulting in a 1.2:2:4 ratio, consistent with the most stable stoichiometry value calculated by ab initio density-functional theory. The experimental results strongly suggest that the most stable structure is generated through a reaction process involving the minimization of total energy. In addition, Ge in the Sb/Te/Ge film diffused into Sb-Te region by thermal energy. However, Ge was not able to diffuse to the near surface because Sb atoms of the high concentration at the surface were easily segregated and hindered the diffusion of other elements.</P>
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.
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).
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>
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.