• 한국식품과학회지
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• 제21권5호
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• pp.619-623
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• 1989

토양으로부터 분리 동정된 Pseudomonas mendocina의 다당류 생산조건을 검토하였다. 최적 배지조성은 Sucrose 23.75g/L, $(NH_4)_2SO_4$ 1.57g/L, Yeast extract 0.5g/L, $KH_2PO_4\;2.0g/L,\;MgSO_4.\;7H_2O\;1.0g/L,\;CaCO_3$ 2.5g/L이었으며, 최적 pH 및 배양온도는 6.5 및 $30^{\circ}C$이었다. 이 조건에서 다당류의 생산량은 5.98g/L이며 대당 수율은 25.18%, 비생산속도는 32.83mg/g-cell/h이었다.

• 호남수학학술지
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• 제17권1호
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• pp.7-14
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• 1995

The purpose of this study is to construct the structure of the connected Lie group G with its Lie algebra $g=rad(g){\oplus}sl(2, \mathbb{F})$, which conforms to Stellmacher's [4] Pushing Up. The main idea of this paper comes from Stellmacher's [4] Pushing Up. Stelhnacher considered Pushing Up under a finite p-group. This paper, however, considers Pushing Up under the connected Lie group G with its Lie algebra $g=rad(g){\oplus}sl(2, \mathbb{F})$. In this paper, $O_p(G)$ in [4] is Q=exp(q), where q=nilrad(g) and a Sylow p-subgroup S in [7] is S=exp(s), where $s=q{\oplus}\{\(\array{0&*\\0&0}\){\mid}*{\in}\mathbb{F}\}$. Showing the properties of the connected Lie group and the subgroups of the connected Lie group with relations between a connected Lie group and its Lie algebras under the exponential map, this paper constructs the subgroup series C_z(G)

• 한국재료학회지
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• 제32권9호
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• pp.379-383
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• 2022

In this study, Barium Germanium glasses were prepared with a composition of xBaO-(72-x)GeO₂-8La₂O₃-20ZnO where x = 16.0, 18.0, 20.0, 22.0 and 24.0 mol% respectively. Their physical and optical properties, such as refractiveness index, glass transition temperature (T_g), softening temperature (T_s), transmittance and Knoop hardness were studied. The results showed that refractive index, T_g, T_s and coefficient of thermal expansion (CTE) increased with increasing BaO concentration. The refractive index of all the prepared samples was observed between 1.7811 to 1.7881. The Abbe number was calculated by formula using n_d (589.3 nm), n_f (656.3 nm) and n_c (486.1 nm) and observed to be between 38 to 40. The Abbe number of the prepared sample was similar to that of BaO and GeO₂. The transmittance of the prepared glasses was observed to be between 80 ~ 82 % throughout the range from 200 nm to 800 nm. Knoop hardness divided into seven steps were measured 5 class (≥ 450 ~ < 550) of all prepared samples.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.446-452
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• 2002

This paper Presents a 3-D design and a Vibration control of a new walking R.G.O.(Robotic Gait Orthosis) and would like to develop a simulation by this walking system. The vibration control and evaluation of the new knee joint mechanism on the biped walking R.G.O.(Robotic Gait Orthosis) was a very unique system and was to obtain by the 3-axis accelerometer with a low frequency vibration for the paraplegia It will be expect that the spinal cord injury patients are able to recover effectively by a biped walking R.G.O.. The new knee joint system of both legs were adopted with a good kinematic characteristics. It was designed attached a DC-srevo motor and controller, with a human wear type. It was able to accomodate itself to a environments of S.C.I. Patients. It will be expect that the spinal cord injury patients are able to recover effectively by a new walking R.G.O. system.

• Restorative Dentistry and Endodontics
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• 제39권4호
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• pp.303-309
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• 2014

Objectives: Hydrogen peroxide ($H_2O_2$) surface treatment of fiber posts has been reported to increase bond strength of fiber posts to resin cements. However, residual oxygen radicals might jeopardize the bonding procedure. This study examined the effect of three antioxidant agents on the bond strength of fiber posts to conventional and self-adhesive resin cements. Materials and Methods: Post spaces were prepared in forty human maxillary second premolars. Posts were divided into five groups of 8 each: G1 (control), no pre-treatment; G2, 10% $H_2O_2$ pre-treatment; G3, G4 and G5. After $H_2O_2$ application, Hesperidin (HES), Sodium Ascorbate (SA) or Rosmarinic acid (RA) was applied on each group respectively. In each group four posts were cemented with Duo-Link conventional resin cement and the others with self-adhesive BisCem cement. Push-out test was performed and data were analyzed using 2-way ANOVA and tukey's post-hoc test (${\alpha}=0.05$). Results: There was a statistically significant interaction between the cement type and post surface treatment on push-out bond strength of fiber posts (p < 0.001, F = 16). Also it was shown that different posts' surface treatments significantly affect the push-out bond strength of fiber posts (p = 0.001). $H_2O_2$ treated posts (G2) and control posts (G1) cemented with Duo-link showed the highest ($15.96{\pm}5.07MPa$) and lowest bond strengths ($6.79{\pm}3.94$) respectively. Conclusions: It was concluded that $H_2O_2$ surface treatment might enhance the bond strength of fiber posts cemented with conventional resin cements. The effect of antioxidants as post's surface treatment agents depends on the characteristics of resin cements used for bonding procedure.

• 대한치과기공학회지
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• 제33권1호
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• pp.47-54
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• 2011

Purpose: To investigate shear bonding strength between dental zirconia ceramics with different surface treatment and metal bracket. Methods: Zirconia ceramics(LAVA, 3M ESPE, USA) were divided to 4 groups according to their surface treatment; no surface treatment(G1), sand blasting(G2), silane coating(G3), and sand blasting+silane coating(G4). Specimens were bonded to metal bracket using resin bond($Transbond^{TM}XT$, 3M Unitek, USA). Shear bond strength was measured using universal test machine(3366 INSTRON. U.S.A) with cross head speed of 1 mm/min. Microstructural investigation for fracture surface was performed after shear test. Results: Shear bonding strengths of single surface treatment groups (G2 and G3) were higher than no treatment group(G1). Combined Treatment Group (G4) showed the highest shear bond strength of 9.15MPa. Microstructural observation shows that higher shear bonding strength was obtained when debonding was occurred at metal bracket/resin interface rather than zirconia ceramic/resin interface. Conclusion: Surface treatment of zirconia is necessary to obtain higher bonding strength. Combined treatment can be more effective when surface the surfaces are kept clean and homogeneous.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.399-399
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• 2011

본 논문에서는 Indium tin oxide (ITO) 투명전극의 성장온도($T_G$)가 Cu(In,Ga)$Se_2$ (CIGS) 박막태양전지에 미치는 영향을 살펴 보았다. ITO 박막은 radio-frequency magnetron sputtering을 이용하여 상온에서 $350^{\circ}C$까지의 다양한 $T_G$ 조건에서 i-ZnO/ glass와 i-ZnO/CdS/CIGS/Mo/glass 기판에 증착되었다. ITO의 비저항과 CdS/CIGS 계면 특성은 $T_G$에 크게 영향을 받았다. $T_G{\leq}200^{\circ}C$에서는 $T_G$가 증가할수록 ITO 저항이 감소하였고 이에 따른 series 저항 감소가 태양전지 성능 향상에 기여하였다. 하지만 $T_G$ > $200^{\circ}C$에서는 CdS 버퍼층의 Cd이 CIGS 층으로 확산되어 소자의 p-n 계면이 파괴되는 것을 발견하였다. $T_G=200^{\circ}C$에서 ITO를 증착한 CIGS 태양전지의 경우 가장 높은 광전변환효율을 보였다.

• 생명과학회지
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• 제34권1호
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• pp.59-67
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• 2024

산딸기, 치자, 유백피의 혼합물인 복합 천연물 LS-RUG-com이 위염, 위궤양, 식도성 역류염 및 Helicobacter를 억제함을 확인한 바, LS-RUG-com을 건강기능식품 개별인정형 소재로 개발하고자 하였다. 본 연구에서는 소재 개발을 위한 LS-RUG-com 분석방법을 확립하고자 하였으며, 산딸기, 치자 및 유백피의 지표물질을 HPLC/UV system을 이용하여 분석방법을 최적화하였다. 본 연구에서는 분석법 validation을 입증하기 위하여 특이성(specificity), 정확성(accuracy), 정밀성(precision), 검출한계 및 정량한계(detection & quantitation limit) 및 직선성(linearity)을 평가하였으며, 그 결과 본 연구의 HPLC/UV 동시 분석법이 산딸기, 치자 분석에 적합하며, 신뢰성이 있음을 증명하였다. 또한 유백피의 HPLC/UV 단독 분석법이 적합하며 신뢰성이 있음을 증명하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.627-628
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• 2012

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
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• pp.116.4-116
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• 1998