• YAKHAK HOEJI
• /
• v.53 no.5
• /
• pp.298-302
• /
• 2009

Mume Fructus extract is used in folk medicine in Eastern Asian countries including Korea. However, its therapeutic effect on thrombosis is not known. Mume Fructus methanol extract (ME) dose-dependently inhibited ADP-induced platelet aggregation and also exhibited about 130% fibrinolytic activity compared to the natto. Oral administration of ME to mice significantly extended tail-bleeding time. ME prolonged both aPTT and PT in human citrated plasma also. These results suggest that the methanol extract from Mume Fructus have antithrombosis activity.

• Nuclear Engineering and Technology
• /
• v.30 no.1
• /
• pp.17-25
• /
• 1998

Transport of carbon and boron impurity ions parallel to magnetic field lines in the tokamak SOL (scrape-off layer) is numerically investigated for a one-dimensional steady state. The spatial distributions of density and velocity of the impurity ions in a steady state are calculated by finite difference method for a single-fluid model. The calculated results show that among forces acting on SOL particles thermal force produced tv plasma temperature gradient is a principal force determining the feature of impurity distribution profiles in the tokamak edge. However, strong collisional friction forces appearing dominant in front of the diverter plate restrain impurity ion flows due to temperature gradients from moving toward the midplane. Consequently, the stagnation point develops in the impurity flow by these two forces near the diverter region, in which ion flows change their directions. Impurity ions turn out to be accumulated at the stagnation points, where peaked profiles of highly-ionized state ions are relatively predominant over those of low-ionized state ions.

• Korean Journal of Veterinary Research
• /
• v.35 no.4
• /
• pp.729-733
• /
• 1995

This study was carried out to determine the effect of renal ischemia on renal function and excretion of amino acid in rabbit. The animal models of renal ischemia induced experimentally by clamping the renal artery for different lengths of time. These results were summarized as follows: 1. Ischemia for 30 or 60 min produced a polyuria which is accompanied by an increase in $Na^+$ excretion. Glomerular filtration rate (GFR) and p-aminohippurate plasma($C_{PAH}$) were not altered by 30 min of ischemia, indicating that transient ischemia results in a marked tubular dysfuction before a reduction in GFR or renal blood flow. 2. Reabsorption of glucose and amino acids such as alanine and lysine was markedly reduced after 30 min of ischemia, and the effect was more pronounced after 60 min of ischemia.

• International Journal of Aeronautical and Space Sciences
• /
• v.15 no.3
• /
• pp.320-334
• /
• 2014

Over the last two decades, numerous experimental and numerical efforts have examined physical phenomena in plasma discharge devices. The physical mechanisms that govern the anomalous electron diffusion from the cathode to the anode in the Hall Effect Thruster (HET) are not fully understood. This work used 1-D numerical method to improve our understanding and gain insight into the effect of the anomalous electron diffusion in the HET. To this end, numerical solutions are compared with various experimental HET performance measurements and the effects of anomalous electron diffusion are analyzed. The relationships between the anomalous electron diffusion and important parameters of the HET are also studied quantitatively. The work identifies the cathode mass flow rate fraction, radial magnetic field distribution, and discharge voltage as significant factors that affect anomalous electron diffusion. Additionally, the study demonstrates a computational process to determine the radial magnetic field distribution required to achieve specific thruster performance goals.

• Bulletin of the Korean Chemical Society
• /
• v.26 no.9
• /
• pp.1415-1420
• /
• 2005

The spectral interferences of OH from aqueous solvents in ICP-AES have been studied and eliminated using a cryogenic argon trap. The prominent lines of Bi I 306.772 nm, Al I 309.271 nm, and V II 310.230 nm, which are very seriously overlapped with the OH band, were examined. With an extended torch and high tangential flow of 20 L/min, water vapor from air entrainment was prevented. The combination of a condenser and argon cryogenic trap was able to eliminated most of water vapor carried by the argon sample gas. Removal of OH spectral interference could extend the linearity of the calibration curve 5-10 times on the lower concentration for ICP-AES. Interference Equivalent Concentration (IEC) has been reduced to 5.6, 5.9, and 12.4 times for Bi, Al and V, respectively.

• Journal of the Microelectronics and Packaging Society
• /
• v.8 no.1
• /
• pp.39-43
• /
• 2001

$SiC_{x}N$_{y}$ film is deposited by electron cyclotron resonance plasma chemical vapor deposition system using $SiH_4$(5% in Ar), $CH_4$ and $N_2$. Ternary phase $SiC_{x}N$_{y}$ thin film deposited at the microwave power of 600 W and substrate temperature of 700 contains considerable amount of strong C-N bonds. Change in $CH_4$flow rate can effectively control the residual film stress, and typical surface roughness of 34.6 (rms) was obtained. Extreme]y high hardness (3952 Hv) and optical transmittance (95% at 633 nm) was achieved, which is suitable for a LIGA mask membrane application.

• Proceedings of the KIEE Conference
• /
• 1989.11a
• /
• pp.111-113
• /
• 1989

Recently nitrided oxides have been investigated for the application as the replacement of thermally grown oxides in the MIS devices. In this paper, nitrided oxides which were treated by the $N_2$ plasma were fabricated with the 350 $^{\circ}C$ substrate temperature, 0.2 torr chamber pressure, 250 watt RF power, 60 seem $N_2$ flow rate, 30 mins treatment time. After the UV light is radiated on the sample, it is noticed that the interface state density, $N_{ss}$, is slightly decreased. Under the UV light, the samples are stress by $\pm$DC bias. After those treatment interface state density. $N_{ss}$, is increased.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.11 no.3
• /
• pp.248-254
• /
• 1998

In the present study the glow discharge characteristics of $CO_2$ in a parallel plate electrode system were investigated, and the decomposition properties of $CO_2$ concerned with the discharge characteristics were discussed. The results show that $CO_2$ concentration decreases with increase in discharge power and decrease in gas pressure. The maximum conversion of $CO_2$ by glow discharge was 52% under the conditions of gas pressure, 10m Torr and 290W of discharge power.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2003.07b
• /
• pp.880-883
• /
• 2003

ZnO thin films for Film Bulk Acoustic Resonator(FBAR) were prepared by FTS (Facing Target Sputtering) system. The FTS methode enable to generate high density plasma, and it has a high deposition rate at 1mTorr pressure. Therefore, the ZnO thin films were deposited on $AZO/SiO_2/Si$ substrates with oxygen gas flow rate, and the other sputtering conditions were fixed such as a sputtering current of 0.8A, a substrate temperature at room temperature. AZO bottom electrode were deposited on $SiO_2/Si$ substrate and by Zn:Al(Al:2wt%) metal target. ZnO thin film thickness and the c-axis preferred orientation of ZnO thin film were evaluated by ${\alpha}-step$ and XRD.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1993.05a
• /
• pp.28-32
• /
• 1993

A deposition rate of styrene thin films is linearly increased, but one of benzene thin films is nonlinearly increased with increasing discharge power under maintaining a polymerization time, pressure and monomer flow rate. And, the reduction of transmittance at shortwave is larger than that of transmittance at longwave. The refractive index with wavelength is various from 1.55 to 1.65. The refractive index of their thin films is decreased with increasing discharge power. Also, it is known that measured results are valid because the calculation of the extinction coefficient is about $10^3$ within variation of refractive index.