• Journal of the East Asian Society of Dietary Life
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• v.20 no.2
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• pp.279-290
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• 2010

Sensory analysis and quality properties were performed on post-aged doenjang (fermented soybean pastes) in order to elucidate the contribution of citrus, green tea and cactus powder to their sensory evaluation. The doenjang added citrus fruits, green tea and cactus powder used a concentration of 0, 3 and 7% (w/w) at 4, 20, $30^{\circ}C$ respectively and analyzed the proximate composition, pH, salt, mineral and amino acid contents after 60 days. Moisture and protein changes during ripening did not show any significant difference. The pH showed lower in the doenjang added citrus and cactus powder than no added soybean paste. The glutamic acid content of doenjang added citrus fruits showed a little decreasing value although there were no differences between samples with various addition contents. Sensory evaluation of doenjang showed that there were no significant differences in preference in the case of added green tea and cactus powder; However, the flavor significantly increased doenjang added 3% citrus powder at $30^{\circ}C$. These results showed that the preference of doenjang containing 3% citrus powder was superior to green tea and cactus powder.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.11a
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• pp.20-21
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• 2005

[ $BaZrO_3$ ], nanopowder was added to YBCO powder to make ($BazrO_3)_x(YBCO)_{(100-x)mol.-%}$ ($BZO_x$-YBCO) ($0{\leq}x{\leq}10$) composite targets fur pulsed laser deposition of superconducting layer in order to investigate the effect of the addition of BZO nanopowder in the YBCO target on the flux pinning properties of $BZO_x$-YBCO thin films. All the $BZO_x$-YBCO thin films were grown on single crystal STO substrate under similar conditions in the PLD chamber. The effect of YBCO targets doped with BZO on the flux pinning properties of $BZO_x$-YBCO thin films has been investigated comparatively. The isothermal magnetizations M(H) of the films were measured at temperatures between 5 and 80 K in fields up to 5 T, employing a PPMS. The optimal amount of BZO nanopowders in $BZO_x$-YBCO thin films to obtain the strongest flux pinning effects at high magnetic fields is about 6 mol.-%.

• Journal of Animal Science and Technology
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• v.46 no.1
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• pp.1-6
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• 2004

This study was conducted to investigate novel genetic variations of MCIR^*3 allele. In general, white spotting or white belt on a black backgroud in pigs is determined by the E$^p$ allele at the MCIR/Extention locus. E$^p$ shares a frameshift mutation with the E$^{D2}$ allele for dominant black color. An oligonucleotide primer set was designed to amplify complete coding sequence of the porcine MCIR gene. The MCIR coding sequences obtained from five breeds those were Landrace(white). Yorkshire(white), Hampshire(belt), Berkshire(spot) and Jeju native black pigs(black), were used for this study. A multiple sequence alignment of the MCIR coding region using Clustal W was performed. The total length of the MCIR coding sequence ranged from 963 to 966 base pairs(bp) among the selected breeds. The sequence analysis of the complete coding region of MCIR was revealed that Hampshire and Jeju native black pig have 3 cytosines deletion and Birkshire has 2 cytosines deletion at codon 23(nt68) in Extention loci. Besides the finding, there were three different missense mutations and a frameshift mutation in the MCIR coding region.

• Transactions of Materials Processing
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• v.22 no.5
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• pp.264-268
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• 2013

Aluminum clad sheets for brazing materials in the automotive heat exchangers are required to exhibit both high strength and excellent erosion resistance. In this study, the effects of microstructural changes on the property of clad sheets due to thermomechanical treatment were investigated. The clad sheets were fabricated by roll bonding of twin-roll-cast AA3527 and AA4343 alloys followed by cold rolling down to a thickness of 0.22mm. Partial or full annealing was conducted at the final thickness in order to improved the erosion resistance while keeping the proper strength. Since full annealing was achieved for a temperature of $400^{\circ}C$, annealing treatments were performed at 360, 380, and $400^{\circ}C$, respectively. The tensile strength of 3527/4343 clad material was found to be inversely proportional to the annealing temperature before the brazing heat treatment. After this latter treatment, however, the tensile strength of the clad material was about 195~200MPa regardless of the annealing temperature. The erosion depth ratio of the clad annealed at $400^{\circ}C$ was 8.8% (the lowest), while that of the clad annealed at $380^{\circ}C$ was 17% (the highest). The effect of annealing temperature on the tensile and erosion properties of 3527/4343 aluminum clad sheets was elucidated by means of microstructural analyses.

• Clean Technology
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• v.10 no.1
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• pp.19-25
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• 2004

The leather was fixed with various colors through the dyeing process in leather manufacturing. During the dyeing process, the amount of 30~50% dyestuff which were not bonded with leather drained with waste water. These dyestuff raise lots of environmental problems, so technology for improving the fixing effect, levelling effect and penentration effect with the use of small amount of dyestuff has been required. Also, insufficient color fastness level 2~3 grade for common natural leather needs to be improved at the same time. Accordingly, the use of ultrasound(us) in dyeing process has decreased the amount of dyestuff and obtained the smooth permeability effect. So, we could find that the reduction of amount of dyestuff in wastewater led to decrease in environmental trouble caused by leather waste water with severe contamination degree and improved fastness up to 0.5 grades.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.772-777
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• 2003

선박이 배출하는 안정수(ballast water)는 외부로부터 유해 생물들이 유입되어 전파해 오는 주요경로로써 해양환경의 매우 중요하고 위험한 일종의 하나이지만, 이에 대한 효과적인 처리방법은 아직까지도 개발되지 못하였다. 그러나 최근 강 전리방전을 이용하여 고 밀집 산소와 물분자를 고농도 수산자유기(OH: hydroxyl radical)로 전리, 활성입자를 발생시켜 신속히 확산시키면 넓은 범위에서 비교적 낮은 농도로 유해성 침입 생물을 잔류물 없이 저렴한 비용으로 살균제나 촉매제의 사용 없이 소멸시켜 처리하는 효과적인 새로운 녹색방법을 제안하였다. 또한, 수산기는 강 산화제로써(산화환원 전위는 2.80 eV), 적조생물을 신속, 효과적으로 사멸시켜 잔유물과 오염물 발생 없이 이상적으로 해양적조현상을 처리할 수 있는 활성물질이다. 고출력 강 전리장치를 활용하면 수산기 활성제의 발생 농도를 Sr104 이상으로 얻을 수 있으므로, 해양적조처리에 요구되는 문턱 값 농도(~l$\times$$10^{-6}$)를 충족시킬 수 있으며, 이 경우 적조생물 소멸처리시간은 불과 10 sec 내외이므로 선박 안정수 처리문제와 함께 적조발생의 난문제를 해양동력학적으로 동시에 해결할 수 있는 효과적인 기술이다. 실험결과로부터 시간당 1 k톤의 활성물질을 발생하는 수산기활성제 제조장치의 경우, 약 4$\times$$10^2$ $\textrm{km}^2$/h의 적조해면을 처리할 수 있으며, 그 비용은 약 US$l,000 정도에 상당하므로, 적조에 따른 경제손실과는 비교될 수 없는 저렴하고 효과적인 방법이다. 활성물질의 생성시간과 가공시간은 불과 수십 $\mu\textrm{s}$ 및 수 sec 에 불과하므로, 1 kton/h 용량의 수산기활성제 제조장치의 환산소비동력은 약 200 kW이고, 장치의 체적은 10~30 ㎥의 공간으로 충분하므로, 소형선박으로 상당면적의 적조피해를 효과적으로 해결할 수 있다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.3
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• pp.301-306
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• 2006

Physiological activities of Allium tuberosum and Allium senescens were examined. Nitrite-scavenging activity, superoxide dismutase (SOD)-like activity and electron-donating ability (EDA) of leeks extracted with water, 50%, and 100% ethanol were measured. Nitrite-scavenging activities at pH 1.2 were most effective in water and 50% ethanol extracts from both samples. SOD-like activities of water and 50% ethanol extracts of both samples were $18.21{\sim}36.33%$ lower than those of 1 and 0.1% L-ascorbate solutions. SOD-like activities of A. tuberosum extracts were higher than those of A. senescens extracts, and water extracts of samples were the highest. EDAs of A. tuberosum extracts were higher ($30.59{\sim}49.68%$) than those of A. senescens extracts, while those of both extracts were lower than 1 and 0.1% L-ascorbate solutions. The results will be useful for understanding the physiological activities of leek extracts.

• Progress in Superconductivity
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• v.3 no.1
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• pp.130-133
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• 2001

A multifilamentary Bi-2223 HTS tape for superconducting power applications was studied through the fabrication of 250-meter long tapes by the PIT(powder in tube) process. To fabricate continuous long wire, a drawing machine, a two-drum bull block and a rolled tape winding machine were developed. Especially, 250-meter long tapes were heat treated in the shape of pancake coil to reduce the heat affect zone and to achieve the high critical current. Engineering critical current density was improved through both the enhancements of critical current density by control of thermal process and the increase of filling factor by using thin Ag alloy sheath tubes less than 1.5 mm in thickness. We have made successfully 250-meter long 37 filamentary tapes with high filling factor up to 31 % employing the modified drawing and rolling technique. The critical current of 250-meter long tapes with pancake coil type was measured by transport method at self-field up to 250 gauss of center field. The measured values, based on the transport critical current at self-field, $I_{c}$ -B characteristics and magnetic field analysis, are 34 A of I$_{c}$ and 4.0 $kA/\textrm{cm}^2$ of $J_{e}$ at 250 m, 77 K, and 0 T. We also have achieved the 56 A of I$_{c}$ and 7.0 $0 kA/\textrm{cm}^2$ of$ J_{e}$ in short tapes at 77K, self-field, and 1$mutextrm{V}$/cm.

• Journal of environmental and Sanitary engineering
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• v.16 no.4
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• pp.55-61
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• 2001

There are many reservoirs used as the source of water supply and they show various specific characteristics in water quality depend seasonal. Especially, there were not a little variations of water quality in summer, as a natural consequence it follows that stratification occured phenomenon and changed anaerobic condition in the bottom of reservoir, and then accumulated Fe and Mn substance in soil and sediment were resolved into water, it attributes to coloration. G purification plant located in Y gun is very small plant in which coloration occurs by Fe and Mn in every summer. Using this plant as a model, the removal methods of Fe and Mn were studied. After prechlorination plus LAS coagulation, Fe, Mn, $NH_3-N$ were decreased from 7.290 mg/l to 0.080 mg/l, from 0.480 mg/l to 0.075 mg/l, from 0.55 mg/l to 0.04 mg/l. But $THM_{s}$ was increased from 0.050 mg/l to 0.044 mg/l. It shows that the prechlorination plus LAS coagulation treatment process in purification plant is effective to remove Fe and Mn ion.

• Journal of Environmental Health Sciences
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• v.24 no.1
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• pp.87-97
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• 1998

This study was performed to investigate the Natural mineral water quality at 47 sites in Chonnam area, samples were collected spring, summer, fall, winter for a seasonal variation in 1996. The results obtained were summarized as follows 1. The mean of F, pH, HCO$_3$, NO$_3$ -N were 0.19 mg/l, 6. 9, 34.99 mg/l, 1.40 mg/l and those of Na, K, Ca, Mg were 12.1 mg/l, 1.2 mg/l, 7.7 mg/l, 2.1 mg/l respectively. 2. The contents of F were reasonable at Multonggol as 1.35 mg/l and Yongbayui as 0.57 mg/l respectively, but there is no detected at Sidong and detected below 0.1 mg/l at Gubongsan, Hansansa area. 3. According to the geological effect, the content of F was showed higher in granite than in tuff, and index of pH was higher in tuff than in andesite, and content of HCO$_3$ was higher in andesite than in granite. 4. The K and O values were used as index of healthy and delicious water. As a result, thirtyfive sites(74.5%) was decided as healthy and delicious water. 5. The contents of NO$_3$-N were detected over 5 mg/l at Sukchonsa, Gajanggol, Yudalsan, Muchang, Kisan.