• Bulletin of the Korean Chemical Society
• /
• v.32 no.11
• /
• pp.3873-3879
• /
• 2011

The potential energy surface (PES) for the isomerizations and dissociations of the acrylonitrile radical cation was determined from the CBS-QB3 and CBS-APNO calculations. The Rice-Ramsperger-Kassel-Marcus model calculations were performed based on the PES in order to predict the competitions among the dissociation channels. The mechanisms for the loss of $H^{\bullet}$, $H_2$, $CN^{\bullet}$, HCN, and HNC were proposed. The $C_3H_2N^+$ ion formed by loss of $H^{\bullet}$ was predicted as a mixture of $CH{\equiv}C-C=NH^+$, $CH{\equiv}C-N{\equiv}CH^+$, and $CH_2=C-C{\equiv}N^+$. Furthermore $CH{\equiv}C-C{\equiv}N^{+{\bullet}}$ was formed mainly by a consecutive 1,2-H shift and 1,2-H2 elimination.

• Journal of the Korean Institute of Telematics and Electronics D
• /
• v.35D no.7
• /
• pp.102-108
• /
• 1998

A new 1*4 optical waveguide power divider is proposed and fabricated. It consists of a 1*4 multi-branch structure with a beam separator and two beam expanders that can control the splitting ratios between the output ports. The proposed optical waveguide power divider is designed by employing the two dimensional finite difference beam propagation method and is fabricated by a reactive ion etching method. The splitting ratio of fabricatd device is 25.0 : 25.7 : 25.3 : 24.0 for TE mode and 25.7 : 25.2 : 24.1 : 25.0 for TM mode. Comapred with the conventional Y-branch structure, the proposed structure shortens the length of a 1*N divider by the factor 3. Thus it reduces the total propagation loss and the total radiation loss at the branch points. furthermore, the splitting ratios between the output ports may be controlled in this structure for some special applications.

• Journal of Integrative Natural Science
• /
• v.5 no.2
• /
• pp.135-138
• /
• 2012

The reduction of efficiency of missing observations on complete diallel cross designs are examined. we studies robustness of optimal block designs for estimating general combining ability against loss of missing observations in diallel cross. A-efficiencies suggest that these designs are fairly robust. Simple g-inverses may be found for the information matrices of the line effects which allow evaluation of expressions for the variances of the differences between the pairs of line effects with missing observations. we numerically calculate the reduction of efficiency for estimating general combining ability against loss of missing observations in diallel cross.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.450-451
• /
• 2008

In this paper, we have designed the Anti-Reflection (AR) coating for 850, 1310 nm(multi type) and 1310, 1550 nm(multi type) wavelength ranges on the ferrule facet of special optical connector. The reflectance of the AR coated ferrule facet is designed under 5% for 850, 1310 nm(multi type) and 1310, 1550 nm (multi type). AR thin film was deposited by ion- assisted deposition in low temperature. The average return loss of the AR coated ferrule facet is 47.1 dB.

• Korean Chemical Engineering Research
• /
• v.47 no.3
• /
• pp.344-348
• /
• 2009

One-dimensional modeling was carried-out to predict the capacity loss of a lithium-ion polymer battery during cycling. The model not only accounted for electrochemical kinetics and ionic mass transfer in a battery cell, but also considered the parasitic reaction inducing the capacity loss. In order to validate the modeling, modeling results were compared with the measurement data of the cycling behaviors of the lithium-ion polymer batteries having nominal capacity of 5Ah from LG Chem. The cycling was performed under the protocol of the constant current discharge and the constant current and constant voltage charge. The discharge rate of 1C was used. The range of state of charge was between 1 and 0.2. The voltage was kept constant at 4.2 V until the charge current tapered to 50 mA. The retention capacity of the battery was measured with 1C and 5C discharge rates before the beginning of cycling and after every 100 cycles of cycling. The modeling results were in good agreement with the measurement data.

• Food Science of Animal Resources
• /
• v.29 no.2
• /
• pp.252-259
• /
• 2009

This study investigated the effects of ion water and premixed mineral supplementation on the growth performance, carcass, and meat quality parameters in finishing pigs ($LY{\times}D$). Each 20 pigs were randomly allotted to three treatments; CON (basal diet), T1(CON diet added with active water), T2 (T1 diet added with 1.0% premixed mineral). Used ion water and premixed mineral were consisted mainly of Zn and Si, respectively. Daily weight gain feed efficacy were the highest in T2, while fat content was the highest in control (p<0.05) than the others. However, the slaughter qualities including dressing percent, backfat thickness, marbling score, meat color, meat texture, drip loss, meat separation and meat qualities including pH, cooking loss, water holding capacity (WHC), shear force, meat color, backfat color, meat texture were not significantly different (p>0.05) among the treatment groups. Panel test scores of tenderness were the highest in T2 compared to the others.

• Journal of the Korean Ceramic Society
• /
• v.31 no.11
• /
• pp.1265-1270
• /
• 1994

Ultra-fine hydroxyapatite powder were synthesized by the hydrothermal reaction at 10 atm, 3 hrs of Ca(OH)2 suspension with (NH4)2HPO4 solution, and were characterized sintering behavior. Sintered bodies of hydroxyapatite powders which synthesized by hydrothermal reaction method has less weight loss, less sintering shrinkage and superior mechanical property, and was more dense than sintered bodies of hydroxyapatite powder which synthesized by wet method. Sintered bodies were hydroxyapatite single phase. When soack in Ringer's solution for 2 weeks, hydroxyapatite powders preserved hydroxyapatite and sintered body absorbed trace of Ca2+ ion with soaked time.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1998.05b
• /
• pp.935-940
• /
• 1998

The Korea Superconducting Tokamak Research (KSTAR) tokamak will have 6 MW of radio-frequency (rf) heating in the ion cyclotron range of frequencies (ICRF). The response of the antenna to the heat loads is analyzed and the resulting stresses in the Faraday shield during the normal operation is calculated. Various heat loading conditions including in the analyzes are the heat loads from the plasma, the ripple-trapped beam particles and the rf loss.

• Proceedings of the Optical Society of Korea Conference
• /
• 2007.07a
• /
• pp.187-188
• /
• 2007

Four kinds of mirror substrates with same surface roughness were fabricated. On those substrates, a dielectric multi-layer coating with high reflectivity was deposited by ion beam sputtering technique. Most of the fused silica mirrors showed lower scattering than the ZERODUR mirrors one, which deposited on substrates similar in surface roughness. The ZERODUR mirrors scattering strongly depend on the micro-structure of $Ta_2O_5/SiO_2$ thin films wear deposited on ZERODUR substrates.

• Bulletin of the Korean Space Science Society
• /
• 2009.10a
• /
• pp.32.2-32.2
• /
• 2009

We examine cyclotron resonant interactions of radiation belt electrons with VLF chorus, plasmaspheric ELF hiss and electromagnetic ion cyclotron (EMIC) waves. Bounce-averaged diffusion rates depend on wave mode, equatorial pitch-angle, electron energy and L-shell. As well, diffusion rates can be sensitive to the latitudinal distributions of particle density and wave power. For different configurations of the plasmasphere, we calculate electron precipitation loss timescales due to combined scattering by VLF chorus, ELF hiss and EMIC waves.