• The Korean Journal of Food And Nutrition
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• v.22 no.1
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• pp.92-96
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• 2009

Comparisons of the physico-chemical characteristics between white Atlantic potatoes and violet Bora Valley potatoes were performed. According to the results, Bora Valley had 7% higher moisture content than Atlantic, but there were no differences in crude fat and crude ash contents. Bora Valley, however, had about 3% less crude protein content than Atlantic. In a vitamin C analysis by HPLC, the Atlantic and Bora Valley potatoes contained 14% and 39% vitamin C, respectively, indicating that Bora Valley contained about twice as much of the vitamin as Atlantic. In a vitamin C analysis by HPLC, the Atlantic and Bora Valley potatoes contained 14% and 39% vitamin C, respectively, The dietary fiber content of Bora Valley was 3.12 g per 100 g higher than that of the Atlantic variety. While Atlantic contained neither glucose nor fructose, both sugars were measured in the Bora Valley potatoes, and there was no difference in sucrose content between the cultivar.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1414-1416
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• 2001

Crack-free and homogeneous compact and epitaxial lead zirconate titanate(PZT) ferroelectric thin films with perovsikte structure have been prepared by sol-eel method. Tetrabutyl titanate, lead acetate and zirconium nitrate are used as raw materials. Glacial acetic acid is used as a catalyst. Ethylene glycol monoethyl ether is used as a solvent. The annealing temperatures of th thin films are 600~900$^{\circ}C$. The values of the remanent polarization Pr, and the coercive field $E_c$, of the PZT ceramic thin films are 46, 35 ${\mu}C/cm^2$ respectively.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.280-281
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• 2006

Powder grades pre-alloyed with 1.5-3 wt% chromium can be successfully sintered at the conventional temperature $1120^{\circ}C$ although well-monitored sintering atmospheres are required to avoid oxidation. Mechanical properties of the Cr-alloyed PM grades are enhanced by a higher sintering temperature in the range $1120-1250^{\circ}C$, due to positive effects from pore rounding, increased density and more effective oxide reduction. Astaloy CrM (Fe-3 wt% Cr-0.5 wt% Mo) with 0.6 wt% graphite added obtains an ultimate tensile strength of 1470 MPa and an impact strength of 31 J at density $7.1\;g/cm^3$, after sintering at $1250^{\circ}C$ followed by cooling at $2.5^{\circ}C/s$ and tempering.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.310-310
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• 2007

Mg-Si-O계 세라믹스에 glass frit 조성을 첨가하여 저온에서의 소결 특성 및 마이크로파 유전 특성을 연구하였다. 기존의 Mg-Si-O계 세라믹스는 우수한 유전특성을 가지고 있으나 높은 소결온도로 인하여 LTCC용 기판 소재로 적용이 어려웠다. 본 연구에서는 MgO, $SiO_2$를 이용하여 $Mg_2SiO_4$을 합성한 후, $B_2O_3-ZnO-Na_2O-SiO_2-Al_2O_3$계 glass 조성을 20~40wt%로 첨가하여 소결온도를 감소시켜 LTCC 기판 소재로서의 적용성을 고찰하였다. glass frit 함량이 증가함에 따라 밀도($g/cm^3$) 및 유전율(${\varepsilon}_r$)은 증가하였고 품질계수($Qxf_0$)값은 감소하였다. glass frit 함량이 40wt%일때 $900^{\circ}C$에서 1시간 소결한 소결체의 유전톡성은 유전율 (${\varepsilon}_4$) = 6.5. 품질계수 ($Qxf_0$) = 4,000(GHz), 온도계수 $(\tau_t)\;=\;{\pm}\;10ppm/^{\circ}C$로 우수한 특성을 확인하였다.

• KSBB Journal
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• v.20 no.5 s.94
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• pp.345-349
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• 2005

The microorganism for odor gas removal was isolated from sewage and contaminated soil. This was characterized as Pseudomonas sp. TKC by morphological, biochemical/physiological, and cultural characteristics analysis of the isolates. The optimum conditions for isolates growth were as follows; substrate concentration 500 ppm, initial medium pH 7.0, incubation temperature $30^{\circ}C$, agitation speed 150 rpm, and MSM medium containing 3 g/L $(NH_4)_2SO_4$.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.49-49
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• 2007

Glass infiltration 방법을 이용하여 '$A_2O_3$/Glass/$Al_2O_3$' 구조의 무수축 LTCC 기판을 제조하였다. Glass infiltration 법에 의한 무수축 기판 제조에 있어 가장 중요한 요소로는 Glass의 점성은 낮고, alumina에 대한 Glass의 젖음성 (wettability)이 좋으며. 낮은 반응성이 요구되기 때문에 Glass의 조성 선정이 무엇보다 중요하다. 본 연구에서는 Na, Pb, Mg 계열의 각기 다른 glass들의 alumina에 대한 젖음성을 평가하여 젖음성 및 치밀성이 우수한 Pb 계열의 Glass를 이용하여 LTCC 기판으로 적용 가능한 온도인 $700{\sim}900^{\circ}C$에서 '$A_2O_3$/Glass/$Al_2O_3$'구조의 glass infiltration 특성을 고찰하였다. 소성 후 수축율은 x-y축 0.2%, Z축 40%, 밑도 $3.8g/cm^3$, 유전율 6.8, 품질계수 552로 무수축 기판으로서의 적용 가능성을 확인하였다.

• Proceedings of the KIEE Conference
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• 1995.07c
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• pp.1431-1433
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• 1995

This paper describes the characteristics of Si Hall sensors fabricated on a SOI(Si-on-insulator} structure, in which the SOI structure was forrmed by SDB(Si-wafer direct bonding) technology. The Hall voltage and the sensitivity of implemented Si Hall devices show good linearity with respect to the applied magnetic flux density and supplied current. The product sensitivity of the SDB SOI Hall device is average $600V/A{\cdot}T$. In the temperature range of 25 to $300^{\circ}C$, the shifts of TCO(Temperature Coefficient of the Offset Voltage) and TCS(Temperature Coefficient of the product Sensitivity) are less than ${\pm}6.7{\times}10^{-3}/^{\circ}C$ and ${\pm}8.2{\times}10^{-4}/^{\circ}C$, respectively. From these results, Si Hall sensors using the SOI structure presented here are very suitable for high-temperature operation.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1477-1479
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• 2000

The annealing treatments on rf magnetron sputtered PZT($Pb_{1.05}(Zr_{0.52},Ti_{0.48})O_3$) thin films(4000${\AA}$) have been investigated for a structure of PZT/Pt/Ti/ITO coated glass. Crystallization properties of PZT films were strongly dependent on RTA(Rapid Thermal Annealing) annealing temperature and time. We were able to obtain a perovskite structure of PZT at 650$^{\circ}C$ and 10min. P-E curves of Pd/PZT/Pt capacitor demonstrate typical hysteresis loops. The measured values of $P_r$, $E_c$ were 15.8[${\mu}C/cm^2$], 95[kV/cm] respectively. Polarization value decrease about 10% after $10^9$ cycles.

• Journal of agriculture & life science
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• v.45 no.4
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• pp.105-112
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• 2011

Nutritional components and antioxidant activities of commercial loquat leaf tea (CLLT) were evaluated. Proximate compositions were as follows; moisture 5.34%, crude protein 8.38%, crude fat 13.26%, nitrogen free extract 46.21%, crude fiber 19.24% and crude ash 7.57%, respectively. Ascorbic acid and total phenolics content of CLLT was 0.47 mg/100 g and 42.55 mg/GAE g, respectively. Mineral elements were Ca 1,624.01 mg/100 g, K 1,099.66 mg/100 g, and Mg 192.70 mg/100 g, respectively. Amino acid contents of CLLT were very rich in glutamic acid 565.98 mg/100 g and deficient in cystine 12.97 mg/100 g. The 2,2'-azino-bis (3-ethylbenzthiazoline-6- sulfonic acid) diammonium salt (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities of hot water extract from CLLT were 72.51% and 90.11%, respectively at a concentration of $1,000{\mu}g/mL$. Reducing power and ferric reducing antioxidant power (FRAP) of hot water extract from CLLT were increased in a dose dependent manner. Therefore, these results suggest that the hot water extract of CLLT possess antioxidant activities and thus it has great potential as a source for functional food such as natural antioxidant.

• Korean Journal of Microbiology
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• v.54 no.3
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• pp.283-285
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• 2018

Azoarcus are known to contain bacterial strains usually found in contaminated areas. Two strains of Azoarcus sp., TSPY31 and TSNA42, were isolated from oil-contaminated marine tidal flats, and their genomic structures were analyzed. The genomes of both TSPY31 and TSNA42 were composed of a single complete chromosome of 4,572,082 bp (G + C content: 63.2%) and 4,886,934 bp (G + C content: 62.8%), respectively. Both genomes were found to contain two copies of styrene monooxygenases that are predicted to be responsible for converting indole to indigo.