• Korean Journal of Optics and Photonics
• /
• v.6 no.3
• /
• pp.222-227
• /
• 1995

A single mode, 100-mW diode laser was injection-locked by the master laser which was spectrally narrowed with Littman-type grating feedback. In the incomplete-injection-locking, we observed that two frequencies were simultaneously generated from the slave laser. The power ratio and frequency shift of two frequency components were proportional to the square of injected laser intensity. When the ratio of the injection intensity to the slave laser intensity was about $10^{-3}$, the injection-locking bandwidth was to be about 1.4 GHz. The bandwidth proportionally increased to the square root of the injection intensity, which was in good agreement with the theoretical predictions. The Iinewidth of the locked-laser was about 2.5 MHz, which was five times as narrow as that of free-running operation. ation.

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.3
• /
• pp.323-328
• /
• 2006

The purpose of this paper was to investigate the reforming characteristics and optimum operating condition of the GlidArc-assisted $C_3H_8$ reforming reaction for the synthesis gas(SynGas) production without formation of carbon black from propane using GildArc plasma reforming. Also, in order to increase the hydrogen production and the propane conversion rate, 13 wt % nickel catalyst was filled into the catalytic reactor and parametric screening studies were conducted, in which there were the variations of vapor mole ratio$(H_2O/C_3H_8),\;CO_2$ mole ratio($CO_2/C_3H_8$), input power and injection flow rate. When the variations of vapor mole ratio, $CO_2$ mole ratio, input power and injection flow rate were 1.86, 0.48, 1.37 kW and 14 L/min, respectively, the conversion rate of the propane reached its most optimal condition, or 62.6%. Under the condition mentioned above, the dry basic concentrations of the SynGas were $H_2\;44.4%,\;CO\;18.2%,\;CH_4\;11.2%,\;C_2H_2\;2.0%,\;C_3H_6\;1.6%,\;C_2H_4\;0.6%\;and\;C_3H_4$ 0.4%. The conversion rate of carbon dioxide was 29.2% and the concentration ratio of hydrogen to carbon monoxide($H_2/CO$) in the SynGas was 2.4.

• Journal of the Korean Society of Food Culture
• /
• v.18 no.6
• /
• pp.584-591
• /
• 2003

The objective of this study is to develope natural and economical Naengmyun broth using stock prepared with chicken heads. Proper mixing ratio of chicken head stock and chicken breast broth was determined through the sensory evaluation. In order to find out the attributes of chicken head-chicken breast broth(CH-CB broth), chicken breast broth and beef brisket(BB) broth were mixed to the chicken head stock and compared the preference and chemical elements between the broths were compared. The appropriate mixing ratio for reinforcing the meat broth and savory flavor, of was determined to 3:7(w:w). The comparison of CH-CB broth's and CH-BB broth's elements showed that the amount of crude protein and ash was the same and, in the case of crude lipid, CH-BB broth had 0.01% more than CH-CB broth. In the case of the total amount of free amino acids, CH-CB broth had 1.6 times more than CH-BB broth. A survey with 50 consumers showed that was prefered between CH-CB broth and CH-BB broth. CH-CB broth with significance.

• Culinary science and hospitality research
• /
• v.23 no.4
• /
• pp.1-9
• /
• 2017

Instant hot sauce was prepared to produce a similar product to Korean-style gochujang using different ratio of cheongguk-jang (0~20%) and red pepper powder (7~27%). Moisture content decreased from 43.21 (control: BS0) to 19.13%(maximum addition of cheongguk-jang: BS4). L value was the lowest with control (BS0), and a-value and the b-value were higher with BS4. pH tended to increase significantly as the addition amount of cheongguk-jang powder increased (p<0.001). Titratable acidity was lowest at 5.40 for BS0 and 6.30 for BS4. Salinity and soluble solids were also decreased but viscosity increased with addition of cheongguk-jang. DPPH radical scavenging activity was increased from 50.9% (BS0) to 77.6% with BS4. Overall preference was highly evaluated with the sample (BS3) prepared with red pepper, cheongguk-jang, japanese apricot extract, and water at 12, 15, 40 and 25% (w/w), respectively. Results showed that the instant hot sauce had a possibility to replace Korean-style gochujang requiring lengthy fermentation time.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2000.07a
• /
• pp.852-856
• /
• 2000

In this paper, we investigated the output power, step-up ratio and efficiency properties of piezoelectric transformer with dielectric and piezoelectric characteristics of manufactured ceramics. The piezoelectric transformers with $2.0$\times$10$\times$48[$mm^3$] size were fabricated and its electrical properties were measured. When output power of 6W was constantly maintained, T2 piezoelectric transformer showed the minimum temperature rise of $9(^{\circ}C)$ at $150(K\Omega)$ load resistance. However, T1 piezoelecric transformer showed the temperature rise of $7.2(^{\circ}C)$ at $200(K\Omega)$ load resistance. The 6[w] CCFL (Cold Cathode Fluorescent Lamp) was successfully driven by T1 and T2 piezoelectric transformer but, its temperature rise $\Delta$T[$^{\circ}C)$] was generated more than $20(^{\circ}C)$. It is concluded that we have to design the piezoelectric transformers so that its output impedance correspond to the load impeadance, including any stray capacitance.

• Journal of Microbiology
• /
• v.45 no.6
• /
• pp.510-514
• /
• 2007

Twenty-five bacterial strains that secrete mucous materials were isolated from sediment obtained from King George Island, Antarctica. Seven of these strains proved capable of producing cryoprotective exopolysaccharides. The strain KOPRI 21653 was selected for the further study of an anti-ice-nucleating polysaccharide (ANP), which originated from a polar region. KOPRI 21653 was identified as Pseudoalteromonas arctica as the result of 16S rRNA analysis. The exopolysaccharide, P-21653, was purified completely from the KOPRI 21653 cell culture via column chromatography and protease treatment. The principal sugar components of P-21653 were determined to be galactose and glucose, at a ratio of 1:1.5, via GC-MS analysis. The cryoprotective activity of P-21653 was characterized via an E. coli viability test. In the presence of 0.1% (w/v) P-21653, the survival ratio of E. coli cells was as high as 82.6% over three repeated freeze-thaw cycles. The survival ratio decreased drastically to 71.5 and 48.1 %, respectively, in five and seven repeated cycle conditions; however, the survival ratios were greater over three (96.6-92.1%) to seven (100.5-91.6%) freeze-thaw cycles in the presence of 0.5 and 1.0% (w/v) P-21653. In addition, at much lower concentrations (0.1-1.0%), P-21653 resulted in survival ratios (83.1-98.4%) similar to those of two commercially available cryoprotectants ($V_{EG}$ plus X-1000, 92.9% and $V_{M3}$, 95.3%), which were utilized at the recommended concentrations (90%). The biochemical characteristics of exopolysaccharide P-21653 reflect that this compound may be developed as a useful cryoprotectant for use in medical applications and in the food industry.

• Journal of the Korean Home Economics Association
• /
• v.35 no.4
• /
• pp.95-110
• /
• 1997

According to the design method for constructing the crotch angle of traditional Korean men's trousers there are differences in from after its completion. Since there is no standardization of visual & aesthetic pattern for the construction method which is stablished by the calculation formular of waist girth hip girth pantleg end and upper outer leg length it is difficult to be used for educational use or for teaching materials. Therefore the purpose of this project according to five models in proportion to the physical standard of Korea in ages from 24 to 29 years old is to establish a design criterion and the standardization of construction methods by introduction the pant construction method of the crotch angle by converting the sitting posture length to seaming crotch center point both knees width in the Korean way of sitting. The production method for the pattern design is as follow: (1) The waist girth formular is {{{{ { w} over {4 } }}}}+{{{{ {w} over {10 } }}}}(2) The hip girth formular is {{{{ {H } over { 4} }}}}+{{{{ {H } over {5 } }}}}(3) The pantleg end formular is {{{{ {H } over {4 } }}}}(4) A crotch angle is fixed at 70 degress.(5) The ratio of outer leg length to leg width is 5:8 (6) The component ratio of the upper outer leg length to the pant length in 5:8(7) The ratio of the division point of front / right inner leg length and left inner leg width to upper outer leg length is 5 : 8

• Journal of Korean Society of Forest Science
• /
• v.99 no.2
• /
• pp.220-225
• /
• 2010

This study was conducted to examine the effects of wound dressing with thiophanate-methyl paste on the compartmentalization of pruning wounds in Acer palmatum. A total of thirty field-grown trees were used for three different treatments, such as no dressing, dressing once right after pruning cut, and dressing twice, one more dressing treatment one year after initial dressing. Wound closure rate (WCR) and discolored/wound area ratio (D/W ratio) two years after treatment were measured. Variations of extractives, holocellulose and lignin at the treated branch unions were also examined. The WCR of no dressing treatment of 70.9% was significantly lower than those of the two dressing treatments (85.4% and 82.7%, respectively), while the difference between dressing once and twice was not significant. The D/W ratio of no dressing treatment (39.3%) was significantly higher than those of the two dressing treatments (around 30%). Generally, at the branch core of the treated union, contents of extractives and lignin were higher and holocellulose contents were lower than the branch core of the union with living branch. Among the branch core of treated union, no dressing treatment showed a relatively lower holocellulose (63.5%), and relatively higher extractives (2.8%) and lignin (26.6%) than dressing once (66.2%, 1.7%, 26.1%, respectively).

• 전자공학회논문지 IE
• /
• v.47 no.2
• /
• pp.13-20
• /
• 2010

This paper describes a current mode PWM DC-DC converter IC for battery charger and supply power converter for portable electronic devices. The maximum supply voltage of IC is 40[V] and 2.8[V]~330[V] DC input power is converted to higher or programmed DC voltage according to external resistor ratio or wire winding ratio of transformer. The maximum supply output current is 3[A] over and voltage error of output node is within 3[%]. The whole circuit needed current mode PWM DC-DC converter circuit is designed. The package dimensions and number of external parts are minimized in order to get a smaller hardware size. The power consumption is smaller then 1[mW] at stand by period with supply voltage of 3.6[V] and maximum energy conversion efficiency is about 86[%]. This device has been designed in a 0.6[um] double poly, double metal 40[V] CMOS process and whole chip size is 2100*2000 [um2].

• Journal of Sasang Constitutional Medicine
• /
• v.22 no.4
• /
• pp.85-97
• /
• 2010

1. Objectives The purpose of this study is to investigate the effects of oral administration of distilled Suhwagije-tang in aging rats. 2. Methods The SD rats used in this experiment were 6, 48 and 68 weeks old. These groups were treated with distilled water(DW), 1% Vitamin C(Vit. C) and 50% Suhwagije-tang(SGT) distillate respectively, once a day for 4 weeks. Blood samples were taken from heart and the levels of various parameters in serum were analysed. 3. Results and Conclusions (1) At all concentration of SGT, survival rates of liver cells were higher than the control group. (2) The rate of which the 10W-SGT group gained weight was significantly higher than that of the control groups. (3) The levels of albumin in serum of 10W-SGT group were significantly increased in comparison to those of the DW group. The levels of ALP, total cholesterol and HDL-cholesterol in serum of 52W-SGT group were significantly decreased in comparison to those of the DW group. (4) The levels of testosterone in serum of SGT groups showed no significantly changes in comparison to those of the control groups. Testosterone levels were naturally decreased with advancing years, so 72W-DW group's testosterone level was significantly decreased in comparison to those of 10W-DW group's. In contrast, 72W-SGT group's level was the highest in comparison to those of the control groups and those of deviation from 10W, 52W and 72W in SGT groups was also smaller than control groups'. (5) The levels of glucose, total-bilirubin, ALT, AST, BUN, CRP, hs-CRP, homocystein, Na, K, Na/K ratio, Cl and Ca in serum of SGT groups showed no significantly changes in comparison to those of the control groups. These results suggest that oral administration of Suhwagije-tang distillate should be effective in promoting growth and preventing rapid decline of testosterone in aging rats does not cause any imbalance in liver, kidney and electrolyte.