• 한국동물학회지
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• 제11권2호
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• pp.48-54
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• 1968

成熱한 albino 雄性 흰쥐를 對照群과 實驗群으로 나누어 對照群에는 0.9% 生理食鹽水를, 實驗群에는 methylene blue (40mg/kg, 食鹽水에 溶解, pH 7.0)를 各各 皮下注射處理하였다. 30 分後에 兩群共히 每分當 33r 으로 總線量 300r 의 X-線을 一時 全身照射하였다. 照射後 24日間에 걸쳐 肝臟 glycogen 含量(Carroll et al. 方法), 血糖含量(Folin and Wu 方法) 및 K 와 Na 含量(flame photometer)과 Cl 含量(automatic chloride titrator)을 各各 測定하여 methylene blue의 放射線에 對한 防禦　果를 硏究調査하였다. 一般的으로 肝臟 glycogen 含量은 兩群共히 X-線照射直後 若干 減少하나 1 日區에서부터 急激한 增加를 나타내고 있으며 特히 實驗群인 methylene blue 處理群에서는 對照群인 生理食鹽水群에 比하여 增加의 遲滯性을 나타내었다. 血糖含量에 對해서는 兩群모두 X-線 照射直後 若干 減少하는 傾向을 보였으나 時日經過에 따라서 서서히 增加하며 特히 實驗根인 methylene blue 處理群은 對照群인 生理食鹽水에 比하여 增加에 遲滯性을 나타내었다. 또한 血液內 電解質含量에 있어서 K, Na 및 Cl 含量은 一般的으로 兩群모두 時日經過에 따라 큰 變化는 없었으나 特히 K와 Na의 含量은 初期狀態에서 若干의 變化가 있었고 Cl 에서는 別變化를 觀察할 수 없는것으로보아 methylene blue가 血液內 電解質含量에는 別影響이 없었다. 以上의 結果로 미루어 보아 炭水化物代謝에 있어서 methylene blue가 放射線에 對한 防禦　果가 있는 것으로 思料된다.

• 천문학회보
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• 제40권1호
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• pp.68.1-68.1
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• 2015

Gravitational collapse is a dynamical process associated with star formation. One observational evidence of such infall motion is so called "blue asymmetry" profile, which is the optically thick line profile with the intensity peak skewed blueward relative to the intensity peak of optically thin lines. We analyzed both HCN J=1-0 and HNC J=1-0 line profiles to study the inflow motion in different evolutionary stages of massive star formation; Infrared dark clouds (IRDCs), High-mass protostellar object (HMPOs), and Ultra-compact HII regions (UCHIIs). The infall asymmetry in the HCN spectra seems to be more prevalent than the HNC spectra throughout all the three evolutionary phases. The prevalence of the blue profile in the HCN spectra is found in every evolutionary stage, with IRDCs showing the largest blue excess. In the case of the HNC spectra, only IRDCs show the blue excess statistically significant. These results suggest that HCN may be a better infall tracer in massive star forming region. In addition, even though the characteristics of the blue profile largely depend on the suitable combination of optical depth and critical density, our analyses also indicate that IRDCs may have the most active infall process compared to other evolutionary phases.

• 천문학회보
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• 제40권2호
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• pp.53.3-53.3
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• 2015

We analyzed both HCN J=1-0 and HNC J=1-0 line profiles to study the inflow motions in different evolutionary stages of massive star formation; infrared dark clouds (IRDCs), high-mass protostellar object (HMPOs), and ultra-compact HII regions (UCHIIs). The infall asymmetry in HCN spectra seems to be prevalent throughout all the three evolutionary phases, with IRDCs showing the largest excess in blue profile. In the case of HNC spectra, the prevalence of blue sources does not appear, excepting for IRDCs. We suggest that this line is not appropriate to trace infall motion in evolved stages of massive star formation because of an astrochemical effect. This result spotlights the importance of considering chemistry in dynamical study in star-forming regions. The fact that the IRDCs show the highest blue excess in both infall tracers indicates that the most active infall occurs in the early phase of star formation, i.e., the IRDC phase rather than in the later phases. However, the UCHIIs is likely still accreting matters. We also found that the absorption dips of the HNC spectra in all blue sources are red--shifted relative to their central velocities. These red-shifted absorption dips may indicate the observational signature of overall collapse although observations with better resolutions are needed to examine this feature more in detail.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1381-1382
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• 2008

Cholesteric Blue phase (ChBP) is constructed by the regular arrangement of the double helix, whereas the Smectic Blue phase (SmBP) has the inter-connected multi-lamellar structure. Orientation fluctuations of polymer stabilized ChBP and spontaneously super-cooled SmBP are discussed. Spatial topology of the defects play key role on the dynamic properties.

• Applied Biological Chemistry
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• 제38권5호
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• pp.447-451
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• 1995

자연계에 풍부한 천연고분자물질인 키틴을 탈아세틸화하여 얻어지는 키토산을 색소의 흡착제로 이용하고자, 색소 Toluidine Blue O(TBO)에 대한 키토산의 흡착 특성을 연구하였다. 키토산과 TBO의 흡착반응에는 키토산 입경, 키토산의 양, TBO의 초기 농도, 반응액의 pH, 반응시간 등이 중요한 인자로 작용하는 것으로 밝혀졌다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1998년도 한국생물과학협회 학술발표대회
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• pp.263.2-263
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• 1998

No Abstract, See Full Text

• 한국분말재료학회지
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• 제11권2호
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• pp.143-148
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• 2004

In the present study, $TiO_2$ imbedded composite powders have been successfully prepared from the (Cu. Zn)/$TiO_2$ composite salt solution. The composite (Cu, Zn)/$TiO_2$ powders were formed by drying the solution at 200~$600^{\circ}C$ in the hydrogen atmosphere. Photocatalytic characteristics was evaluated by detecting the decomposition ratio of aniline blue with UV-visible spectrophotometer(Shimazu Co., UV-1601). Phase analysis of (Cu, Zn)/$TiO_2$ composite powders was carried out by XRD and DSC, and powder size was measured with TEM. The mean particle size of composite powders was about 100mm. As the reduction temperature increases, a few zinc sulfide and oxide phases was formed and copper oxide phase was reduced. The decomposition ratio of aniline blue was about 80％ under the UV irradiation by the TiO$_2$ phase in the composite (Cu, Zn)/$TiO_2$ powders and similar decomposition ratio of 80％ was obtained at the UV lightless condition by virtue of Cu and Zn compounds.

• Corrosion Science and Technology
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• 제23권2호
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• pp.104-112
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• 2024

Al-Zn-Mg-Si alloy coatings have been developed to inhibit corrosion of cold rolled steel sheets, and an understanding of the alloy system helps prevent coating defects. We used a Bridgman furnace to characterise the nature and formation mechanisms of the phases present in the quaternary system with 0.4 wt% Fe. In the directional solidification experiments we imposed steep temperature gradients and varied the pull rate. After the samples were quenched in the furnace, detailed characterization of the samples was carried out by electron microscopy (SEM/EDS). From the dT/dt vs T plots of the cooling curves of the alloys, the solidification path was determined to be $Liquid{\longrightarrow[80]^{544-558}}{\alpha}-Al{\longrightarrow[80]^{453-459}}Al/Mg_2Si{\longrightarrow[80]^{371-374}}Al/Zn{\longrightarrow[80]^{331-333}}Zn/mgZn_2$. The formation mechanisms of the Mg and Zn containing phases and their morphology was discussed together with the effects of the cooling rate. Key findings include the lengthening of the mushy zone in directionally solidified samples remelted against a positive temperature gradient, as well as an enrichening of the α-Al phase by Zn through remelting. Mg₂Si and other Si based phases were observed to adopt a much finer faceted microstructure in favour of a script-like microstructure when exposed to the higher cooling rate of coolant quenching.

• 대한산업공학회지
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• 제32권4호
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• pp.338-346
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• 2006

In this paper, we analyze and review introduction, implementation, and revision phases in the six sigma movement in LG Electronics. In LG Electronics, 6 sigma activities have been activated not only at manufacturing divisions but also in transactional processes, business, product R&D, marketing, and software development. At present, six sigma is a tool to improve processes and also become the engine of the business innovation. In this paper, concepts and contents of an on-going LG innovation process called TDR(Tear Down & Redesign) are explained in detail. We also propose important aspects and give the future prospect for six sigma.

• 한국세라믹학회지
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• 제55권4호
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• pp.368-375
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• 2018

This study deals with the color formation of ceramic pigment in the $TiO_2$-SnO-ZnO system. We designed compounds to control the color formation depending on the composition using the Design of Experiment. The color coordinate values of synthesized pigments, $L^*a^*b^*$ were measured and statistically analyzed color for changing elements depending on its composition. The relationship between the major crystalline phases and chromaticity was examined using XRD, and the oxidation states of each element were analyzed by XPS. The synthesized pigments based on the compound design exhibited various color changes ranging from yellow-orange to green-blue and brown. The statistical analysis on the spectrophotometer results shows that $a^*$ and $b^*$ values decreased with $TiO_2$ content, and increased with SnO content. Yellow-orange color was detected with the main peak of SnO, and the green-blue color developed with the main peak of $Zn_2TiO_4$. The $a^*$ and $b^*$ values increased with increased SnO peak intensity, and decreased with increased $Zn_2TiO_4$ peak intensity. The results revealed that pigment color formation was influenced by changes in the main crystalline phases and crystalline intensity. However, XPS analysis of the oxidation states of each element showed little correlation with the pigment chromaticity result.