• Journal of the Korean Ceramic Society
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• v.32 no.6
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• pp.669-676
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• 1995

In this study, EO glass films were deposited by R.F. magnetron sputtering using EO glass target. The glass formation of the EO film was greatly dependent on the substrate temperature and the crystallization started at approximately 28$0^{\circ}C$. As the temperature of the substrate or the oxygen content in the sputtering gas increased, UV/VIS/NIR absorption edge moved toward longer wavelength. A wave guiding phenomenon was observed from the prism-coupler experiment and a fluorescence of 1.06${\mu}{\textrm}{m}$ originated from 4Fe3/2longrightarrow4I11/2 transition of Nd3+ was detected from the film containing Nd3+ ions.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.831-834
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• 2002

A novel ceramic synthesis technique, combustion synthesis, is explored to produce an orange-emitting $SnO_2:Eu^{3+}$ phosphors. This technique involves a reaction of metal salts with a citric acid as an organic fuel. The variation of the ratio of citric acid to metal introduces change in reaction temperature and atmosphere of the combustion reaction, which in turn influences crystallinity and luminescence properties of the final products significantly. And the heat treatment of the as-synthesized product improved the CL intensity of the products. Especially, the sample treated at above 1100 $^{\circ}C$ shows an orange-emission, which is attributed to the formation of single phase and well-crystallized $SnO_2$:Eu in rutile structure.

• Journal of Magnetics
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• v.4 no.3
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• pp.84-87
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• 1999

It is shown that progressive crystallization of non-magnetostrictive Co-based metallic glass (VITROVAC 6030) leads to an increase of coercivity by more than three orders of magnitude. The mechani는 responsible for this phenomenon are interpreted showing that the main source for the giant increase of the coercivity is the pinning effect on the domain walls originating from the created crystallites of the size much smaller than the domain width (correlation length for ferromagnetic exchange interactions). It is also shown that gradually devitrified non-magnetostrictive metallic glass is an excellent model material for verification of N el's theory describing the Rayleigh rule.

• Journal of Digital Contents Society
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• v.18 no.2
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• pp.347-356
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• 2017

It is well-known that the face recognition method via sparse representation has been proved very robust and showed good performance. Its weakness is, however, that its time complexity is very high because it should solve $L_1$-minimization problem to find the sparse solution. In this paper, we propose to use the ROMP(Regularized Orthogonal Matching Pursuit) method for the sparse solution, which solves the $L_2$-minimization problem with regularization condition using the greed strategy. In experiments, we shows that the proposed method is comparable to the existing best $L_1$-minimization solver, Homotopy, but is 60 times faster than Homotopy. Also, we proposed C-SCI method for classification. The C-SCI method is very effective since it considers the sparse solution only without reconstructing the test data. It is shown that the C-SCI method is comparable to, but is 5 times faster than the existing best classification method.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.59.2-59
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.148.3-148
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• 1998

• Natural Product Sciences
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• v.19 no.4
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• pp.303-310
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• 2013

Velvet deer antler (VDA) is well known oriental medicine claimed to have tonic activities as improving bone mineral density (BMD), immune-enhancing, rejuvenating and many other medicinal activities. Ossified deer antler (ODA) is bony product produced by over-calcification of deer antler due to late harvesting. The extraction efficiency of ODA by conventional boiling in water must be very poor due to bony nature, hence the reputations for the medicinal efficacies of ODA has been highly under-evaluated compared to that of VDA without any experimental evidences. Employing our new efficient water extraction process ($135^{\circ}C$), the extracts of ODA and VDA were analysed to compare the contents of bioactive components and the potencies of pharmacological activities. The results showed that; 1) The $135^{\circ}C$ extraction (autoclaving) of ODA gave highly increased amount of biomass, 120% more than the conventional extraction by 100-boiling, whereas the same treatment for VDA showed only 15% increased amount of biomass. 2) Feeding the ODA- or VDA-extracts to oophorectomized rats showed very potent BMD-recovering activity. 3) During the ossification of deer antler, the total collagen content was found to be increased by addition of type-1 to pre-existing type-2 collagen, but not replacement of type-2 to type-1 collagen. High titer of peptide hormones like growth hormone and IGF-1 were detected in the ODA- and VDA-extracts and also in the serum of ODA- or VDA-treated oophorectomized animals dose-dependently. Present experimental data will give a conclusion that folkloric poor reputations on ODA must be concerned only with poor extraction efficiency of conventional $100^{\circ}C$ water extraction and not based on the composition of bioactive substances of ODA.

• International Journal of Contents
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• v.8 no.1
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• pp.74-81
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• 2012

The aim is to investigate the analgesic effect of transcranial direct current stimulation(tDCS) on central neuropathic pain(CNP) in spinal cord contusive rat model. Twenty Sprague-Dawley rats($250{\pm}50$ g, male) were used. Thoracic spinal cord(T10) was contused using New York University(NYU) spinal cord impactor. The animals were randomly assigned to two groups; GroupI: Non-treatment after SCI induction(n=10), GroupII: application of tDCS(0.1 mA, 20 min/time, 2 times/day, 5 days/6week) after SCI induction(n=10). Assess the effect of tDCS using the Basso Beattie Bresnahan(BBB) locomotor rating scales, Touch $test^{TM}$ sensory evaluator(TTSE), Plantar test$^{\circledR}$after contusion at the $2^{nd}$, $3^{rd}$, $4^{th}$, $5^{th}$, $6^{th}$ week and the immunohistochemistric response of c-fos in the thalamus, cerebral cortex after contusion at the $3^{rd}$, $6^{th}$ week after SCI. The scores of BBB scales were significantly different from $3^{rd}$week. TTSE were different significantly over time, but there were no differences at each evaluation times on between-measure time effects. Plantar test were different significantly over time and there were difference at the $4^{th}$, $6^{th}$ week after SCI on between-measure time effects. Also, immunohistochemistric response of c-fos was reduced significantly from $3^{rd}$, $6^{th}$ week after SCI in tDCS group compared with control group in thalamus and cortex. These results identified that tDCS of non-invasive therapeutic method may have beneficial analgesic effect on CNP after SCI with behavioral test and immunohistochemical test.

• Journal of agriculture & life science
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• v.44 no.1
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• pp.61-67
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• 2010

This study was to investigate the fructose, total fructan, polyphenol contents, and antioxidant activity of garlic treated acid and heat($100{\sim}140^{\circ}C$ for 2 hr). Optimum condition of acid hydrolysis of fructan was 0.3N $H_2SO_4$ and 5 min. As increasing heating temperature, fructose content was significantly increased from 17.1 to 189.9 mg/g whereas total fructan content was decreased from 248.1 to 2.0 mg/g. The fructan was mostly hydrolyzed by heating at $130^{\circ}C$ for 2 hr. The polyphenol contents was increased from 0.85 to 13.74 mg/g increasing heating temperature and also antioxidant activity was significantly increased. The polyphenol contents and antioxidant activity on acid hydrolysate after heating was slightly increased.

• Horticultural Science & Technology
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• v.16 no.3
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• pp.355-357
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• 1998

Various temperatures and plant growth regulators were assessed to investigate the nature of the dormancy and bud sprouting of stem cutting of Hibiscus syriacus 'Honghwarang'. The bud sprouting was promoted as temperature increased. Under $30^{\circ}C$ condition, stem cuttings began sprouting at 4days after cutting and showed 100% sprouting at 6 days after cutting. With GA or BA treatment, the cuttings started sprouting at 6 days after cuttings under $25^{\circ}C$ condition and reached 65% sprouting, which was not different from the results without hormone treatments. However, ABA dipping under below $25^{\circ}C$ condition resulted in low sprouting, whereas under over $25^{\circ}C$ condition they started sprouting at 6 days after cutting and reached 93% at 12 days after cutting, which indicated that ABA is not effective on inhibition of sprouting under high temperature condition.