• Journal of Industrial Convergence
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• v.21 no.2
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• pp.93-101
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• 2023

In this study, the physical and chemical fiber damage caused by knives, scissors, and chemicals was analyzed and used as technical data to determine the cause of the damage. Using 4 types of knives, 5 types of scissors and 4 types of chemicals(Sulfuric Acid, Hydrochloric Acid, Sodium Hydroxide, Potassium Hydroxide) physical and chemical to Cotton, Wool, Polyester, Rayon, T/C (Polyester 50%, Cotton 50%), T/W (Polyester 50%, Wool 50%) Damages were created and analyzed for damage caused by tools and chemicals. For penetrating damage caused by knives and scissors, 'V' type damage was generally seen when the blade part was penetrated, 'T', 'ㅁ', ''C' type damage was found, and in the case of scissors, 'Y' ' This type of damage was common. Fiber damage caused by chemicals showed various damage such as remanent trace, corrosion, degraded, contracting, and color changes. Physical damage of fibers showed differences in characteristics according to the shape characteristics of tools, and chemical damage showed differences in characteristics according to chemicals and types of fibers.

• Bulletin of the Korean Chemical Society
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• v.33 no.5
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• pp.1470-1474
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• 2012

The pharmacokinetics of prunasin after oral administration of amygdalin or a decoction of peach seeds was determined and compared in rats. A $C_{18}$ column was used for separation at a column temperature of $25^{\circ}C$. The mobile phase consisted of 20% aqueous acetonitrile, and the flow rate was 0.5 mL/min. After oral administration of a decoction of peach seeds, prunasin was absorbed rapidly, reaching a maximum plasma concentration ($C_{max}$) of 62.1 mg/L within 45 min. After oral administration of amygdalin, the absorption of prunasin was delayed. The $C_{max}$ of prunasin was 42.9 mg/L and was reached at 60 min. Values for the pharmacokinetic parameters of prunasin, including $T_{max}$, $C_{max}$, AUC, $T_{1/2}$, CL/F, and V1/F, were significantly different for the oral administration of amygdalin compared with that of a decoction of peach seeds.

• Journal of the Korean Ceramic Society
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• v.46 no.1
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• pp.74-80
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• 2009

Electrospinning process is the useful and unique method to produce nanofibers from metal precursor and polymer solution by controlled viscosity. In this study, the NiZn ferrite nanofibers were prepared by electrospinning with a aqueous metal salts/polymer solution that contained polyvinyl pyrrolidone and Fe (III) chloride, Ni (II) acetate tetrahydrate and zinc acetate dihydrate in N,N-dimethylformamide. The applied electric field and spurting rate for spinning conditions were 10 kV, 2 ml/h, respectively. The obtained fibers were treated at $250^{\circ}C$ for 1 h to remove the polymer. Finally, the NiZn ferrite fibers were calcined at $600^{\circ}C$ for 3 h and annealed at $900{\sim}1200^{\circ}C$ in air. By tuning the viscosity of batch solution before electrospinning, we were able to control the microstructure of NiZn ferrite fiber in the range of $150{\sim}500\;nm$ at 770 cP. The primary particle size in $600^{\circ}C$ calcined ferrite fiber was about 10 nm. The properties of those NiZn ferrite fibers were determined from X-ray diffraction analysis, electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, thermal analysis, and magnetic measurement.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.179-179
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• 1994

새로운 항생물질을 개발하기 위하여 토양으로부터 분리한 균주를 액체 및 고체배지에서 배양하여 여러 검정균에 대하여 종이디스크법으로 항균효력을 조사하였다. 그 결과 (+), G(-), fungi 등에 강한 항균 효력을 보인 토양균 SNUS 8810-43과 Mycobacterium, fungi에 항균력을 보인 토양균 SNUS 8810-129를 선택하여 각각의 배양액에서 항생물질을 분리하고, 분리한 항생물질의 구조를 규명하고자 하였다. 토양균 SNUS 8810-43의 배양액으로부터 항생물질을 분리하기 위하여 양이온 교환 수지 관 크로마토그래피와 셀룰로오스 관 크로마토그래피를 수행하여 시료 JJH-II-46-43을 얻었다. 시료 JJH-II-46-43의 IR, $^1$H-NMR, $^{13}$C-NMR, $^1$H-$^1$H COSY, $^1$H-$^{13}$C COSY, FAB-MS 스펙트럼을 얻어 분리한 항생물질의 구조를 분석하여 이 항생물질의 구조가 N-methylstreptothricin과 동일하다는 것을 확인하였다. Mycobacterium smegmatis에 강한 활성을 나타내는 물질을 토양균 SNUS 8810-129로 부터 분리하였다. 토양균 SNUS 8810-129를 배양한 V-8 아가판을 메탄올로 추출하여 이를 실리카겔 관 크로마토그래피와 preparative TLC로 시료 LCH-IV-17B, LCH-III-387을 얻었다. 시료LCH-IV-l7B, LCH-III-387의 $^1$H-NMR, $^{13}$C-NMR, FAB-MS, CI-MS, IR등의 스펙트럼을 얻어 분리한 항생물질의 구조를 분석하여 이 항생물질이 glycolipid계 항생물질이라는 것을 알았다. $^{13}$C-NMR 상의 자료와 화학적인 방법으로 구성당을 조사한 결과 이 항생물질을 이루고있는 당은 rhamnose 임을 알았다. 또 이 항생물질을 구성하는 지방산은 화학적인 방법과 MS 스펙트럼, $^{13}$C-NMR 스펙트럼으로부터 hydroxydecanoic acid인 것으로 확인되었다. 항생물질 LCH-III-387와 항생물질 LCH-IV-l7B는 각각 rhamnose를 1, 2개 포함하고 있는 것으로 확인되었다. 그리고 동일한 탄소수의 지방산을 가지고 있는 것으로 생각되었다. 이들 항생물질을 이루는 구성당과 지방산간의 정확한 연결및 구조, 생리활성에 관한 연구는 계속 수행중에 있다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.3
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• pp.357-361
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• 2009

This study performed analysis on the thermal pattern and current characteristics of an LED ((Light Emitting Diode) street lamp. It did this using a TVS (Thermal Video System) to analyze the LED street lamp's thermal pattern, and measured its characteristics using an oscilloscope. The ambient temperature and humidity during the experiment were maintained at $24{\pm}2[^{\circ}C]$ and 50~60[%]. The capacity of the LED street lamp was 120[W] and nine sets of modules were arranged at uniform intervals. On one module, 24 LED lamps were arranged in a radial pattern. The analysis of the thermal diffusion pattern at the front of the LED lamp showed that the maximum surface temperature was approximately $34[^{\circ}C]$. In addition, there was almost no change in the temperature of the upper cover, and the temperature at the side showed a uniform thermal diffusion pattern. The surface temperature of the converter converting AC to DC increased to approximately $46[^{\circ}C]$. The analysis results of the thermal characteristics of one LED indicated uniform thermal characteristics for an initial eight minutes. However, the temperature at the center of the LED increased to approximately $82[^{\circ}C]$ after 12 minutes had elapsed. It can be seen from this that the temperature at the center of the LED was higher than the allowable temperature, $70[^{\circ}C]$ of the insulating material for general electrical devices. Therefore, it is necessary to design a lamp in such a way that the plastic insulating material does not come into contact with or get close to the LED lamp. The voltage of the LED lamp converted by the AC/DC converter was measured at DC 27[V] and the current was DC 13[A]. Consequently, it can be seen that in order to secure an adequate light source, it is important to supply a stable current that was greater than the current of other light sources. Therefore, appropriate radiation of heat is required to secure the stability and reliability of the system.

• Asian-Australasian Journal of Animal Sciences
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• v.24 no.10
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• pp.1399-1406
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• 2011

This study aimed to establish the optimum level of palm kernel meal in the diet of Santa Ines lambs based on the sensorial characteristics and fatty acid profile of the meat. We used 32 lambs with a starting age of 4 to 6 months and mean weight of $22{\pm}2.75kg$, kept in individual stalls. The animals were fed with Tifton-85 hay and a concentrate mixed with 0.0, 6.5, 13.0 or 19.5% of palm kernel meal based on the dry mass of the complete diet. These levels formed the treatments. Confinement lasted 80 days and on the last day the animals were fasted and slaughtered. After slaughter, carcasses were weighed and sectioned longitudinally, along the median line, into two antimeres. Half-carcasses were then sliced between the 12th and 13th ribs to collect the loin (longissimus dorsi), which was used to determine the sensorial characteristics and fatty acid profile of the meat. For sensorial evaluation, samples of meat were given to 54 judges who evaluated the tenderness, juiciness, appearance, aroma and flavor of the meat using a hedonic scale. Fatty acids were determined by gas chromatography. The addition of palm kernel meal to the diet had no effect on the sensorial characteristics of meat juiciness, appearance, aroma or flavor. However, tenderness showed a quadratic relationship with the addition of the meal to the diet. The concentration of fatty acids C12:0, C14:0 and C16:0 increased with the addition of palm kernel meal, as did the sum of medium-chain fatty acids and the atherogenicity index. Up to of 19.5% of the diet of Santa Ines lambs can be made up of palm kernel meal without causing significant changes in sensorial characteristics. However, the fatty acid profile of the meat was altered.

• Asian-Australasian Journal of Animal Sciences
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• v.25 no.8
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• pp.1055-1062
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• 2012

Two SNPs, i.e. L127V and T172M, of bovine growth hormone (GH) causing the presence of GH gene haplotypes A, B, and C was previously shown to alter intramuscular fatty acid (FA) composition in Japanese Black (JB) heifers. To determine the SNP effect on somatotropic hormone concentration and lipogenesis, we measured plasma GH, insulin, and insulin-like growth factor-1 (IGF-1) concentrations. We also measured mRNA levels of fatty acid synthase (FASN), stearoyl-coA desaturase (SCD), and sterol regulatory element binding proteins-1 (SREBP-1) and FA composition in diaphragm tissues. Heifers with genotype CC had the lowest plasma insulin concentration and FASN and SCD mRNA levels among genotypes. FASN mRNA levels in haplotype A tended to positively correlate with saturated FA (SFA) content and negatively correlated with C18:2 and unsaturated FA (USFA) contents. SCD mRNA levels in haplotype A positively correlated with monounsaturated FA (MUFA) contents and negatively correlated with C18:0 content. They also tended to positively correlate with C16:1, C18:1, and USFA contents and USFA/SFA ratio and negatively correlate with SFA content. Taken together, GH gene polymorphism affects the lipogenic genes expression levels and their relationships with fatty acid compositions in diaphragm tissues of JB heifers at 31 months of age.

• Proceedings of the KSME Conference
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• 2001.06a
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• pp.181-186
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• 2001

JLF-1 steel (Fe-9Cr-2W-V-Ta), low activation ferritic steel, is one of the promising candidate materials fer fusion reactor applications. High temperature fatigue life and tensile strength of JLF-1 steel and its TIG welded joints were investigated at the room temperature and $400^{\circ}C$. The strength of base metal (JLF-1) is in between those of weld metal and the HAZ. When the test temperature was increased from room temperature to $400^{\circ}C$, both strength and ductility decreased for base metal, weld metal and the HAZ. The longitudinal specimens of base metal showed similar strength and ductility compared with those of the transverse specimens at room temperature and $400^{\circ}C$. Little anisotropy was observed in the JLF-1 steel base metal in terms of rolling direction. Fatigue limit of weld metal which was obtained from cross-weld specimen is 495MPa. Thus, the weld metal showed the higher fatigue limit than those of base metal at both room temperature and $400^{\circ}C$. Little anisotropy of fatigue properties was observed for JLF-1 base metal in terms of rolling direction. When the test temperature was increased from room temperature to $400^{\circ}C$, the fatigue limit of both base metal and weld metal decreased substantially.

• The Korean Journal of Physiology and Pharmacology
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• v.3 no.5
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• pp.471-479
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• 1999

The Kv channel activity in vascular smooth muscle cell plays an important role in the regulation of membrane potential and blood vessel tone. It was postulated that increased blood vessel tone in hypertension was associated with alteration of Kv channel and membrane potential. Therefore, using whole cell mode of patch-clamp technique, the membrane potential and the 4-AP-sensitive Kv current in cerebral arterial smooth muscle cells were compared between normotensive rat and one-kidney, one-clip Goldblatt hypertensive rat (lK,lC-GBH rat). Cell capacitance of hypertensive rat was similar to that of normotensive rat. Cell capacitance of normotensive rat and 1K,lC-GBH rat were $20.8{\pm}2.3$ and $19.5{\pm}1.4$ pF, respectively. The resting membrane potentials measured in current clamp mode from normotensive rat and 1K,lC-GBH rat were $-45.9{\pm}1.7$ and $-38.5{\pm}1.6$ mV, respectively. 4-AP (5 mM) caused the resting membrane potential hypopolarize but charybdotoxin $(0.1\;{\mu}M)$ did not cause any change of membrane potential. Component of 4-AP-sensitive Kv current was smaller in 1K,lC-GBH rat than in normotensive rat. The voltage dependence of steady-state activation and inactivation of Kv channel determined by using double-pulse protocol showed no significant difference. These results suggest that 4-AP-sensitive Kv channels playa major role in the regulation of membrane potential in cerebral arterial smooth muscle cells and alterations of 4-AP-sensitive Kv channels would contribute to hypopolarization of membrane potential in 1K,lC-GBH rat.

• Advances in pediatric surgery
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• v.8 no.2
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• pp.101-106
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• 2002

The antiangiogenic effects of novel agent KJ3, Betulinic acid, and Fumagillin on the neovascularization were studied by examining ultrastructural alterations in the vasculature of synthetic gelform and mouse neuroblastoma C1300. Small pieces of gelform with 0.4% agar were introduced subcutaneously (s.c.) in 7 week old male CH3/HeJ mice. After the $LD_{50}s$ were determined by FACS analysis, a third of $LD_{50}$ of three drugs were injected either locally or intraperitoneally every other day for 14 days. A/J mice were inoculated s.c. with the C1300 neuroblastoma cell line, then either saline or three drugs were injected in the same manner. The antiangiogenic effects of three drugs were studied by measuring the histologic changes in tumors, and immunostaining for CD34, VIII/vWF, CD105, and thymidine phosphorylase. In the drug treated groups, the number of vessels in gelform experiments and C1300 neuroblastoma experiments were lower than the corresponding values in the control. The histologic findings were significantly different in drug treated groups on day 7, but these were not significant on day 14. These results imply that antiangiogenic agents were effective when the tumor burden is minimal.