• Resources Recycling
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• v.27 no.6
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• pp.38-43
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• 2018

In this study, using electro-refining process and methane gas reduction, we performed studying the recovery of tin with high purity from waste tin oxide had used as a electrode rod of ceramic furnace which occurred during glass production process. We recovered the crude tin of 99% purity from a methane gas reduction process and controlled a little amount of impurities. When the electrolytic refining condition was a current density of $60A/dm^2$ and the sulfuric acid concentration of 0.75 mol, 96.8% of recovered tin (99.979% of purity) were recovered during the electrolytic refining. We confirmed that toxic impurities such as Pb, Sb included in electrode rod. could be controlled.

• Food Science and Preservation
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• v.17 no.3
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• pp.430-434
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• 2010

This study was carried out to compare anti-oxidant activities of chaff vinegar liquors. We examined the effects of several kinds of chaff vinegar liquor (CA; CA1, chaff vinegar liquor; CA2, wood vinegar liquor; CA3, chaff vinegar liquor with red ginseng; and CA4, chaff vinegar liquor with rosemary) by 1,1-diphenyl-2-picrylhydrazyl (DPPH), ferric reducing activity of plasma (FRAP) assay, and $Cu^{2+}$ reduction. The results showed that CA have potential in reducing DPPH, FRAP and $Cu^{2+}$ activity. CA was increased its anti-oxidant activity by the fermentation of rosemary extract. The present results suggest that the chaff vinegar liquor could be used for anti-oxidant agents and/or be developed for anti-oxidative potentiation of prototypes.

• Journal of Energy Engineering
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• v.20 no.2
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• pp.77-83
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• 2011

It is requested to improve negative electrode of Ni-Zn battery for industrial application. Ni-Zn battery has main problems not to commercialize because of short life cycle, heavy gassing and fast electrolyte vaporization so far. It has been studied on 8 cells performances under promoting electric, additional materials and binders changed. With these materials($Ca(OH)_2$, $Bi_2O_3$), negative electrolyte can be manufactured equal and tight as well as low gassing. Furthermore, to supply EG-EP#12(gravity 1.26), keeping stable electrolyte gravity in battery, the life cycle of Ni-Zn battery is extremely improved 200~300% than initial performance.

• Korean Journal of Acupuncture
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• v.23 no.4
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• pp.177-186
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• 2006

목적 : 약침액(藥鐵液)의 지질과산화 예방 및 cytocome P450과의 상호 작용에 있어서 대계의 역할은 과거 연구가 거의 없었다. 따라서 본 실험에서는 대계 약침액이 지질과산화를 예방하고, 심혈관계질환 유발에 밀접한 연관이 있는 cytochrome P450의 직접적인 저해 효과를 검토 하고자 한다. 방법 : 대계 약침액이 지질과산화를 억제하는 정도를 평가하기 위하여 세포막을 구성하는 불포화지방산의 일종인 linoleic acid를 대상으로 지질과산화 진행 시간과 대계 약침액의 농도에 의존적인 저해 효과를 실험하였다. 또한 실험쥐의 간조직을 이용하여, 강제적인 과산화를 유도한 후 이를 방어하는 효능을 검토하였다. 그리고 cytochrome P450을 구성하는 그룹의 1A1, 1A2 및 2E1의 활성을 각각 EROD, MROD, p-nitrophenol, aniline 방법으로 측정하였다. 결과 및 결론 : 대계 약침액은 세포막 구성의 불포화 지방산인 linoleic acid의 산화를 시간 및 처리 농도에 의존적으로 억제하였고, 실험쥐의 조직 과산화를 유의성 있게 저해하였다. 또한 aryl hydrocarbon receptor (AHR)을 활성화 시켜 polycyclic aromatic hydrocarbons (PAHs)에 의한 심혈관계 질환 유발 인자로 알려진 cytochrome P450 1A1 및 1A2의 발현을 일부 저해하였으며, 특히 체내에 흡수된 알콜 대사에 관여하는 P450 2E1을 강하게 억제 시켰다.

• Resources Recycling
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• v.23 no.3
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• pp.37-43
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• 2014

A study has been made on the recovery of tin and copper from waste solder stripper by oxalate precipitation. With the increasing of the oxalic acid addition, tin was precipitated effectively and removed above 99.5% of tin when the oxalic acid, in an amount 1.0-1.5 times the stoichometric requirement, was added. But, in this case, only 2.0% of copper was precipitated and lead, iron were not precipitated. So, tin was selectively removed from the waste solution. With the increasing of the reaction temperature, the removal percentage of tin was increased and maximum value at arounf $60^{\circ}C$ and decreased with increase in the temperature any more. After filtering the precipitate and drying in oven, $SnO_2$ was obtained from the precipitate. After removal of tin in stripping solution, above 91% of copper was selectively removed by Cu-oxalate by addition of oxalic acid.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.14 no.4
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• pp.323-327
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• 2021

This paper produced SUS MASK, which is used for OLEDs, using an automatic liquid management system. The SUS MASK was tested by setting the hole diameter to 0.4 mm. The additive F300 was found to be excellent as the hole diameter was close to 0.4 mm and the error range was measured to be 0.08 on average. And as a result of measuring the weight reduction amount of CuCl2 and FeCl3 according to the change in oxidation-reduction potential (ORP), FeCl3 is relatively sensitive to ORP changes. Experiments were conducted on whether ORP (610 mV) and specific gravity (1.463) were automatically controlled while continuously etching the SUS Mask. Experimental results show that the automatic liquid management system is well controlled because the setting value is not significantly changed. After setting the hole diameter to 0.4 mm as the target, the experiment results were measured from 0.36 to 0.44. Therefore, it is expected that etching processing in the manufacturing process of SUS MASK can be improved with higher precision by applying the manufactured automatic liquid management system.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.3
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• pp.325-334
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• 2013

The objective of this study was to compare the content and metabolic activities between fresh pine needle juice (PNJ) and fermented pine needle juice (FPNJ). A variety of factors were measured, including total phenolic content (TPC), antioxidant activity [DPPH radical scavenging activity (RSA), total radical-trapping antioxidant potential (TRAP), oxygen radical absorbance capacity (ORAC), cellular antioxidant capacity (CAC)], anti-genotoxic activity, ${\alpha}$-glucosidase inhibitory activity, and angiotensin converting enzyme (ACE) inhibitory activity. The TPC was $17.3{\pm}0.2$ and $4.6{\pm}0.0$ mg GAE/g in PNJ and FPNJ, respectively. The DPPH RSA, TRAP, and ORAC values increased in a dose-dependent manner for both PNJ and FPNJ, with significantly higher activities in PNJ than FPNJ. The CAC against AAPH-induced oxidative stress in HepG2 cells was protected by both PNJ and FPNJ. Pretreatment with PNJ and FPNJ in human leukocytes produced significant reductions in $H_2O_2$-induced DNA damage at a concentration of $50{\mu}g/mL$. ${\alpha}$-Glucosidase inhibitory activity was significantly higher in FPNJ than PNJ. The ACE inhibitory activity was about 87.1% and 60.0% in 1:1 diluted PNJ and FPNJ, respectively. This study suggests that the fermentation of PNJ could enhance the regulation of blood glucose metabolism and both PNJ and FPNJ might be a new potential source of natural antioxidant, anti-diabetic, and anti-hypertensive agents applicable to food.

• Korean Journal of Food Science and Technology
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• v.48 no.6
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• pp.574-581
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• 2016

Glasswort (Salicornia herbacea L.) is an edible halophyte that grows in salt marshes. In the present study, anti- and pro-oxidant activities and cytotoxic properties of glasswort were investigated. Solvent fractions, including fractions of hexane, ethylether (Fr.E), ethylacetate (Fr.EA), butanol and water, were prepared from a 70% methanol extract of glasswort aerial parts. Fr.EA contained the highest levels of total polyphenols and flavonoids, showing the strongest scavenging activities against DPPH and ABTS radicals, and nitrite. In addition Fr.EA showed the most potent cytotoxic effects on HCT-116 colon cancer cells and INT-407 normal intestinal cells, followed by Fr.E. Most fractions also decreased the level of reactive oxygen species in the treated cells, but generated $H_2O_2$ in the medium. The cytotoxic activity of Fr.EA was more pronounced in the presence of ascorbic acid or N-acetylcysteine. These results indicate that the fractions from aerial parts of glasswort exhibit both anti- and pro-oxidant activities, and these activities modulate cytotoxic properties.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.168-168
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• 2016

BDD(Boron Doped Diamond) 전극은 전위창이 넓고, 다른 불용성 전극에 비해 산소발생과전압이 높아 물을 전기화학적인 방법으로 처리하는 영역에 있어 매우 효과적일 뿐만 아니라, 전통적인 불용성 전극에 비해 전극 표면에서 수산화 라디칼(-OH)과 오존(O3)의 발생량이 월등히 높아 수처리용 전극으로서의 유용성이 매우 높다. 따라서 BDD 전극을 수처리용 전극에 사용하는 경우 수산화 라디칼(-OH)과 오존(O3), 과산화수소(H2O2) 등과 같은 산화제의 생성은 물론이고, 염소(Cl2)가 포함되어 있는 전해액에서는 차아염소산(HOCl)이나 차아염소산이온(OCl-)과 같은 강력한 산화제가 발생되어 전기화학적 폐수처리, 전기화학적 정수처리, 선박평형수 처리 등의 분야에 널리 활용될 수 있다. 본 연구에서는 상온 및 상압에서 운전이 가능하고 난분해성 오염물질 제거 효과가 뛰어난 전기화학적 고도산화공정(Electrochemical Advanced Oxidation Process, EAOP)에 적합한 대면적의 BDD 전극을 개발하고 자 하였다. 이러한 BDD 전극의 성막 방법으로는 필라멘트 가열 CVD, 마이크로파 플라즈마 CVD, DC 플라즈마 CVD 등이 널리 알려져 있는데 최근에는 설비의 투자비가 비교적 저렴하고, 대면적의 기판처리가 용의한 필라멘트 가열 화학기상증착법(Hot Filament Chemical Vapor Deposition, HFCVD)이 상업적으로 각광을 받고 있다. 따라서 본 연구에서는 HFCVD 방법을 이용하여 반응 가스의 투입비율, BDD 박막의 두께, 기판의 재질 등에 따른 여러 가지 성막 조건들을 검토하여 $100{\times}100mm$ 이상의 대면적 BDD 전극을 개발하였다. Fig. 1은 본 연구를 통하여 얻어진 BDD 전극의 표면 및 단면 SEM이다.

• Korean Journal of Food Science and Technology
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• v.33 no.4
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• pp.497-500
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• 2001

The purpose of this study was to investigate the extraction method and antioxidative activities of phenolic compounds from Korean red tail ginseng. Antioxidative activities of red tail ginseng were evaluated with its ability to donate hydrogen to DPPH, and to inhibit the oxidation of linoleic acid and LDL induced by $H_2O_2$ and $FeCl_2$, respectivly by measuring the MDA formation. Total phenolic compounds expressed as % caffeic acid were 0.80%, 0.12%, 0.06%, 0.03%, 0.01% when red tail ginseng was consecutively extracted with 60% ethanol for 5 times, most of the phenolic compounds was recovered in the extract obtained after 3 times of extraction. The extraction efficacy of 60% ethanol was superior to that of water in extraction phenolic compounds, and the efficacy did not change after evaporating the extract followed by dissolving with water. 60% ethanol extract of red tail ginseng had weak ability to donate hydrogen to DPPH. MDA determination showed the antioxidative effect with inhibition ratio of 72.23% on linoleic acid oxidation by addition of red tail ginseng extract at the concentration of 1,500 ppm. 22.52% of LDL oxidation was inhibited by addition of 250 ppm.