• 한국산학기술학회논문지
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• 제22권4호
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• pp.554-562
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• 2021

본 연구는 김치로부터 β-glucosidase 생산하는 Lactobacillus plantarum SM4를 분리하여 흰 민들레 발효를 수행하고 미백과 주름개선 효과를 가지는 생리활성 평가를 위해 총 폴리페놀 함량, 플라보노이드 함량, 항산화 활성, 타이로시네이즈 활성저해, 콜라게네이즈 활성저해, 자외선 차단율을 분석하였다. 흰 민들레 발효물의 총 폴리페놀 함량이 41.8±0.26 mg GAE/g DW로 열수추출물 21.4±0.67 mg GAE/g DW에 비해 2배 가량 증가하였으며 항산화 활성은 65.6±4.7%로 4배 증가하였다. 미백과 주름개선의 지표인 타이로시나아제 및 콜라게네이즈 활성저해에 있어 흰 민들레 발효물이 87.9±4.73%와 66.7±3.48%로 열수추출물에 비해 각각 2.4배와 1.5배 증가한 결과를 보였다. 흰 민들레 발효물과 열수추출물의 자외선 차단 효과를 비교하였을 때, UVA(320 nm) 차단율이 각각 64.7%와 15.2%로 측정되어 흰 민들레 발효물이 열수추출물에 비해 더 높은 효과를 나타내어 김치로부터 분리한 L. plantarum SM4가 생산하는 β-glucosidase를 발효를 통해 피부 미백, 주름 방지, 자외선 차단 효과가 증진됨을 확인하였다.

• 한국식품과학회지
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• 제27권4호
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• pp.625-630
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• 1995

전분의 열수추출물 성분이 전분의 겔형성이나 성질과 어떤 관계가 있는 가를 연구하기 위해 묵제조용전분(도토리, 메밀, 녹두)과 비묵제조용전분(옥수수, 쌀, 밀)의 현탁액을 $85^{\circ}C$에서 가열하여 추출물을 얻고 이들의 이 화학적 성질과 분자량 분포를 조사하였다. 또한 추출물로 겔을 만들어 전분겔과 함께 산가수분해하여 가수분해정도, 가수분해잔유물의 평균중합도, 분자량분포 등도 조사하였다. 추출물의 추출율은 아밀로오스 함량이 적고 지질의 함량이 많은 곡류전분이 적어 $4.0{\sim}6.6%$를 나타냈으며 아밀로오스함량이 많고 지질의 함량이 적은 도토리, 녹두전분은 각각 11.7%와 13.5%로 추출율이 컸다. 이화학적 성질과 분자량 분포결과를 보면 묵제조용전분의 추출물은 대부분이 아밀로오스로 구성되어 있으며 비묵제조용전분의 추출물에는 약간의 아밀로펙틴물질이 포함되어 있음을 알 수 있었다. 겔을 산가수분해(1 N HCl, $35^{\circ}C$, 60일)한 결과 추출물겔의 가수분해도는 $22{\sim}35%$이었으며 전분겔의 가수분해도는 아밀로펙틴의 분해로 추출물겔보다 높은 $70{\sim}84%$를 나타냈다. 추출물겔의 가수분해에서는 아밀로오스가 많은 묵제조용전분의 추출물겔의 가수분해도가 $22{\sim}29%$이었으며 아밀로오스가 적은 비묵제조용전분의 추출물겔의 분해도는 $30{\sim}35%$이었다. 가수분해 잔유물은 겔크로마토그래피 결과 한 개의 피크를 갖는 것으로 나타났으며 추출물겔의 잔유물의 평균중합도가 전분겔의 평균중합도보다 더 컸다.

• Archives of Reconstructive Microsurgery
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• 제16권1호
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• pp.14-22
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• 2007

Perforator free flap (PFF) is currently a major reconstructive option for soft tissue reconstruction in adults. Although PFFs have been used commonly, most reconstructive surgeons still hesitate to perform PFFs in children. The main cause of concern is the perceived high failure rate related to the small diameter of children's perforator vessels. We present 8 consecutive cases of successful transfer of thoracodorsal artery (TDA) & anterolateral thigh (ALT) perforator flap in children. Between 2003 and 2005, 8 children(4 to 13 years old) with soft tissue defects of the extremities were reconstructed with TDA & ALT PFFs. All flaps completely survived. There were no problems relating to vascular spasm or occlusion. Range of motion of reconstructed extremities were fully recovered. Among 8 patients, only 1 patient was performed an additional flap thinning procedure. 8 cases of TDA & ALT perforator flaps were successfully transferred in children. PFF is an excellent option in reconstruction of children as well as in adults because of its thinness, long pedicle length, least donor site morbidity and acceptable donor site scar.

• 환경위생공학
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• 제22권3호
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• pp.77-87
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• 2007

The ion exchange resins have been synthesized from chlormethyl styrene - 1,4 - divinylbenzene(DVB) with 1%, 3%, and 5%-crosslinking and macro cyclic ligand of OenNen-$H_4$ by copolymerization method and the adsorption characteristics of uranium(VI), iron(II) and samarium(III) metallic ions have been investigated in various experimental conditions. The synthesis of these resins was confirmed by content of chlorine, element analysis, and IR-spectrum. The effects of pH, time, dielectric constant of solvent and crosslink on adsorption of metallic ions were investigated. The uranium ion was showed fast adsorption on the resins above pH 3. The optimum equilibrium time for adsorption of metallic ions was about two hours. The adsorption selectivity determined in ethanol was in increasing order uranium ${UO_2}^{2+}>Fe^{2+}>Sm^{3+}$ ion. The adsorption was in order of 1%, 3%, and 5% crosslink resin and adsorption of resin decreased in proportion to order of dielectric constant of solvent.

• 한국초전도ㆍ저온공학회논문지
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• 제15권3호
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• pp.1-4
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• 2013

We investigated the effect of Nb substitution for Ru on the structural and magnetic properties of $(Ru_{1-x}Nb_x)\;Sr_2(Sm_{1.4}Ce_{0.6})Cu_2O_z$ Samples. X-ray diffraction measurements indicated that nearly single-phase samples are formed in the range from x = 0 to 1.0. The superconducting transition temperature determined from the inflection in the field-cooled magnetic susceptibility decreased only slightly from $T_c$ = 25 K for x = 0 to $T_c$ = 22 K for x = 1.0, in consistent with the change in room temperature thermopower of the samples. However, the Nb substitution for Ru above x = 0.25 significantly suppressed the weak ferromagnetic component of the field-cooled magnetic susceptibility. It was also found that the Nb substitution for Ru results in an enhanced diamagnetic susceptibility with Nb content above x = 0.5 in both zero field-cooled and field-cooled magnetization measurements, in contrast to the behavior of the samples with $x{\leq}0.5$ in which the diamagnetic susceptibility decreases as the Nb content increases.

• 한국정밀공학회지
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• 제22권11호
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• pp.51-58
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• 2005

Laser surface hardening technologies have been used to improve characteristics of wear and to enhance the fatigue resistance for automotive parts. The objective of this research work is to investigate the influence of the process parameters, such as power of laser and defocused spot position, on the characteristics of laser heat treatment for the case of SM45C medium carbon steel. CW Nd:YAG laser is selected as the heat source. The optical lens with the elliptical profile is designed to obtain a wide heat treatment area with a uniform hardness. From the results of the experiments, it has been shown that the maximum hardness is approximatly 780 Hv when the power and the travel speed of laser are 1,095 W and 0.6 m/min, respectively. In addition, the hardening width using the elliptical lens was three time larger than that using the defocusing of laser beam.

• The Journal of Korean Physical Therapy
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• 제21권4호
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• pp.73-79
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• 2009

Purpose: Recently, neurostimulation studies involving manipulation of cortical excitability of the human brain have been increasingly attempted. We investigated whether transcranial direct current stimulation (tDCS) applied to the underlying cerebral cortex, directly induces cortical activation during fMRI scanning. Methods: We recently recruited five healthy subjects without a neurological or psychiatric history and who were right-handed, as verified by the modified Edinburg Handedness Inventory. fMRI was done while constant anodal tDCS was delivered to the underlying SM1 area?? immediately after the pre-stimulation for eighteen minutes. Results: Group analysis yielded an averaged map that showed that the SM1 area and the superior parietal cortex in the ipsilateral hemisphere were activated. The voxel size and peak intensity were, respectively, 82 and 5.22 in the SM1, and 85 and 5.77 in the superior parietal cortex. Conclusion: Cortical activation can be induced by constant anodal tDCS of the underlying motor cortex. This suggests that tDCS may be an effective therapeutic device for enhancing? physical motor function by modulating neural excitability of the motor cortex.

• 대한수의학회지
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• 제22권2호
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• pp.161-165
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• 1982

Biochemical and antimicrobial susceptibility tests were conducted on 40 strains of Pseudomonas aeruginosa originated from diseased chicken submitted for diagnosis to this Institute during 1978-80. An extensive study of the biochemical properties revealed that the tested strains can be identified with Pseudomonas aeruginosa. Antibiogram showed that all the strains were susceptible to gentamicin, colistin and amikacin but resist to nitrofurantoin, trimethoprim+sulfamethoxazole, ampicillin, methicillin and kanamycin, and had varing degreed of resistance to other antimicrobials including carbenicillin, sulfomamides, neomycin, streptomycin, tetracycline and chloramphenicol. Three of the most frequent resitance patterns observed were FM SXT AM ME KM CM TC SM NE SSS Pattern, FM SXT AM ME KM CM TC SM NE SSS CB Pattern and FM SXT AM EKM CM TC SM Pattern, and these resistance patterns contained 72.5% of the tested strains.

• 전기의세계
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• 제38권10호
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• pp.13-22
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• 1989

본 연구에서는 EL에 사용되고 있는 분말형광체에 대한 물리적 제현상을 소개하고 아울러 본 연구실에서 연구해 온 ZnS : Mn, Zns : TbF$_{3}$, Zns : SmF$_{3}$, CaS : EuCl$_{3}$, SrS: CeCl$_{3}$ 형광체 및 박막EL 소자에 관한 실험과 내용을 바탕으로 형광체의 특성을 종합 분석하고 현상을 고찰, 검토하고자 한다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 춘계 학술대회지
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• pp.21-22
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• 1998