• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.271-274
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• 2009

연구에서는 두 가지 종류의 미세관을 사용하여 증류수 및 0.1vol.%, 0.3vol.%의 농도를 가지는 은 나노유체의 층류 유동 조건인 Re 수 500~2500의 범위에서 대류 열전달 실험을 수행하였다. 열전달 계수 실험 결과 0.1vol.%의 경우 증류수에 비해 약 3~69%의 향상이 있었고 0.3vol.%의 경우 약 35~125%의 열전달 계수의 향상이 있었다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.186-186
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• 2015

본 연구에서는 플라즈마 전해산화 처리된 AZ31 마그네슘 합금의 내식성에 봉공처리가 미치는 영향에 대해 알아보았다. 플라즈마 전해산화 공정에 의해 형성된 피막에 대하여 증류수 및 알칼리 수용액에서 봉공처리를 실시하였으며, 개회로 전위 측정, 동 전위 분극실험 및 염수분무실험을 통해 내식성을 평가하였다. 실험 결과 증류수 및 알칼리 수용액에서 모두 봉공처리를 함에 따라 내식성이 향상되었으며, 봉공처리 시간을 증가시킴으로써 AZ31 마그네슘 합금의 내식성을 크게 향상 시킬 수 있었다.

• Journal of the Korean Society of Visualization
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• v.20 no.3
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• pp.117-127
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• 2022

The present study has investigated the performance of hydrogen gas generators for inhalation purposes based on polyelectrolyte membrane water electrolysis (PEMWE). The system applied two watering methods. One is pumped water (pumping system) and the other is gravity-fed water without a pump (non-pumping system). The cell efficiencies were compared by measuring the cell voltage and temperature in the hydrogen gas generator, respectively. The results show that the cell voltage and temperature increase with the cell current. The cell temperature is lower in the pumping system than that in the non-pumping system at a given cell current. Even though the amount of hydrogen production is the same regardless of the pumping system, the cell efficiency of the hydrogen gas generator in the non-pumping system is better than that in the pumping system.

• Journal of Life Science
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• v.13 no.2
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• pp.168-174
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• 2003

The chemical compositions and antioxidant activity of green tea extracts in medilite-extraction water were compared to that of distilled water(DW). Antioxidant activity was fetermined by the formation of thiobarbituric acid reactive substances (TBARS) in rat liver homogenates and microsomes and the scavenging activity of free radicals by DPPH ($\alpha$, $\alpha$'-diphenyl-$\beta$-picrylhydrazyl). The order of total polyphenolic compounds and extracted yield by extracts was medilite 325 mesh-extraction water, medilite 600 mesh-extraction water and distilled water(DW). The ranges of scavenging activity of green tea extracts in DPPH method were 60.95% - 64.51%. The inhibition ratios of TBARS formation in the rat liver homogenates and microsomal fractions were significantly lower with green tea extracts by DW-extraction than with both medilite 325 mesh and 600 mesh-extraction water. The concentration of iron ion of water containing medilite 325 mesh and green tea extracts and of water containing medilite 600 mesh and green tea extracts were significantly higher compared to DW. Therefore, this result suggested that enhanced concentration of iron ion in green tea extracts by medilite-extraction water containing high iron ion content was associated with enhanced peroxidation of the rat liver microsomal fractions. These results showed that total polyphenolic compounds, the % of yield and mineral compounds of green tea extracts were increased using medilite 325 mesh and 600 mesh-extraction water.

• Proceedings of the Membrane Society of Korea Conference
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• 1993.10a
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• pp.75-76
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• 1993

자연수에는 무기이온, 용해유기물, 미립자, 미생물과 같은 성분들이 혼재되어 있다. 일반실험실에서 사용하는 증류수, RO수 또는 이온교환수는 실험용 기구 세척수, 일반 정성화학 실험 등에는 적당하지만, 최근 급속히 발전하는 생명공학의 조직배양용이나 PHLC, AAS, 이온크로마토그래피 등 정밀분석기기 용수로는 부적당하다.

• Elastomers and Composites
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• v.42 no.2
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• pp.102-106
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• 2007

Water swelling behaviors of SBR vulcanizates with different reinforcing systems of carbon black, silica without a coupling agent, and silica containing a coupling agent were studied. Distilled water and 3.5% NaCl solution were used as swelling media. The water swelling ratios in the distilled water were higher than those in the salt solution. The water swelling ratios of the carbon black-filled samples were lower than those of the silica-filled ones. For the silica-filled SBR vulcanizates, the specimens without the silane coupling agent had higher water swelling ratios than those containing it. Water swelling behaviors of SBR composites with different 1,2-unit contents were also compared. The water swelling ratios tended to decrease by increasing the 1,2-unit content.

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.261-263
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• 2004

본 연구에서는 산성전리수와 환원전리수가 생체물질인 DNA와 단백질의 분해에 미치는 영향을 조사하였다. 산성전리수에서 DNA는 반응 1일 후 약 $40\%$가 분해되었고 1주일 후에는 거의 완전히 분해되었다. 이에 비해 환원전리수에서 DNA는 총 10일간의 반응시간동안 거의 분해가 되지 않았다. 산성전리수에 크기가 약 40 kDa인 효소단백질을 반응시켰을 때 반응시점부터 효소단백질이 분해되기 시작하여 26 kDa와 35 kDa의 단백질 조각이 잘라져 나왔다. 증류수에 반응시킨 효소단백질도 산성전리수에서와 동일한 크기의 단백질 조각을 생성하면서 분해되었다. 산성전리수와 증류수에 의한 단백질의 분해는 $4^{\circ}C$ 보다 $25^{\circ}C$에서 더 심화되었다.

• Journal of the Institute of Convergence Signal Processing
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• v.24 no.1
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• pp.21-26
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• 2023

Knowledge distillation (KD) is a model lightening technology that transfers the knowledge of deep models to light models. Most KD methods have been developed for classification models, and there have been few KD studies in the field of super-resolution (SR). In this paper, various KD methods are applied to an SR model and their performance is compared. Specifically, we modified the loss function to apply each KD method to the SR model and conducted an experiment to learn a student model that was about 27 times lighter than the teacher model and to double the image resolution. Through the experiment, it was confirmed that some KD methods were not valid when applied to SR models, and that the performance was the highest when the relational KD and the traditional KD methods were combined.

• Journal of the Korean Geosynthetics Society
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• v.1 no.1
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• pp.43-51
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• 2002

In this study, free swell index of betonite was examined in several regeants; distilled water, leachate, seawater and 3% NaCl solution. Free swell index values of bontonite to be added Poly(acrlylic acid), PYA(Polyvinyl Alcohol) or SCMC (Sodium Carboxymethyl Cellulose) were evaluated and compared. From this, it was confirmed that hydraulic conductivities of GCL in seawater were examined and the hydraulic conductivities of GCL in seawater were compared to those in distilled water. The average values of free swell indices of bentonite were decreased in order of distilled water>leachate>seawater. It was shown that no significant differences were occurred for free swell index between seawater and 3% NaCl solution. For bentonite to be added PVA, the other reagents except distilled water didn't affect increase of swelling. Swelling properties of bentonite to be added SCMC were improved except 3% NaCl solution.

• Journal of the Korean Wood Science and Technology
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• v.41 no.4
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• pp.276-286
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• 2013

The goal of this study was to investigate change of thermal decomposition feature of miscanthus (Miscanthus sacchariflorus) after removal of inorganic constituents using distilled water (D.I-w; 30, 60 and $90^{\circ}C$). The carbon content was increased whereas the oxygen content was decreased with the temperature of D.I-w treatment. Moreover, ash content was slightly decreased from 4.6% of control to 3.2% of $90^{\circ}C$ D.I-w treated sample. Results of total monomeric sugar contents and X-ray diffraction (XRD) analysis showed that structural changes of cellulose/hemicellulose regions did not occurr during D.I-w treatment. Results of inductively coupled plasma emission spectrometer (ICP-ES) showed that miscanthus has the largest amount of inorganic constituents such as potassium (5,644 ppm), phosphorus (3,995 ppm), magnesium (1,403 ppm) and calcium (711 ppm). Thermogravimetric analysis (TGA) confirmed that the yield of char slightly decreased whereas the yield of volatiles increased with increasing D.I-w treatment temperature. In addition, differential thermogravimetric analysis (DTGA) indicated that the maximum decomposition rate ($V_M$) and temperature ($T_M$) corresponding to VM were varied from $0.82%/^{\circ}C$, $360.60^{\circ}C$ of control to $1.17%/^{\circ}C$, $362.62^{\circ}C$ of $90^{\circ}C$-D.I-w treated sample.