• 대한화학회지
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• 제29권4호
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• pp.365-371
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• 1985

이온쌍크로마토그래피에 의한 유기 및 무기음이온을 분리하는데 반대이온으로서 양이온 염료인 메틸렌 부루$(MTB^+)$를 사용하여 흡수가 되지 않는 음이온 시료를 간접적으로 분광광도 검출기로서 가시영역인 665nm에서 검출할 수 있었으며 혼합시료의 분리를 시도한 결과 좋은 분리도와 높은 감도를 보여주었다. 또한 여러 실험조건에서 분리인자를 측정하여 머무름 기구를 조사하였다. 본 연구에서 머무름 기구는 $MTB^+$가 고정상에 일차층(primary layer)을 형성하고 반면 음이온 시료 또는 이동상에 존재하는 다른 음이온들이 경쟁적으로 이차층(secondary layer)을 형성하는 ion-interaction model임을 확인하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.310-310
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• 2009

In the two structure of ITO/N,N'-diphenyl-N,N' bis (3-methylphenyl)-1,1'-biphenyl-4,4'-diamine(TPD)/R-H : R-D/Al device, ITO/Amorphous Fluoropolymers/TPD/R-H : R-D/LiF/Al device. we studied the effect of organic materials defending on the electrical characteristics of red OLEDs. The thickness of TPD and R-H : R-D was manufactured 40 nm, 60 nm, respectively under a base pressure of $5\times10^{-6}$Torr using a thermal evaporation. The AF used for an hole-injection is the thickness of 0.5 [nm] and the LiF used for an electron-injection is the thickness of 0.5 [nm]. Compared to the two from the devices made with the hole injection and without hole injection We found that the luminous efficiency and the external quantum efficiency are improved a fact of one- hundred, two, respectively.

• 전기화학회지
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• 제13권1호
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• pp.1-9
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• 2010

본 논문에서는 주요 차세대 태양전지로 분류되는 염료감응 태양전지와 유기(고분자)태양전지에 대한 연구 동향을 살펴보고 이들의 하이브리드 기술전망에 관해 살펴보았다. 특히 두 분야는 기존 무기물 소재의 태양전지와의 경쟁력을 제고하기 위한 측면에서도 상호 전략적인 기술융합을 통한 하이브리드 기술의 개발이 필요한 시점이다. 기술적으로나 시기적으로 아직 초기단계임에도 기술융합에 대한 새로운 응용 가능성에 많은 관심을 끌고 있을 뿐 아니라 성공적인 융합기술 개발의 파급효과도 매우 클 것으로 예상된다.

• 한국미생물·생명공학회지
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• 제25권4호
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• pp.427-433
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• 1997

Sludge Returned CMAS process was applied to treat the wastewater from electric accessory manufacturing company while this type of wastewater was usually treated by chemical process. This result show that the removal rate of TCOD was about 70-80% regardless of hydraulic retention time, On the contrary, the removal rate of BOD was abtained in a range of 77-92% depending on hydraulic retention time. In order to remove more than 80% of organic materials with the proposed process, the F/M ratio should be maintained below 0.17. In this case, the calculated value of organic removal rate, Km, was calculated to be 1.26 hr$^{-1}$, and the ratio of cell synthesis/total energy was 0.32 and 0.26 for COD and BOD base, respectively. The yield coefficient was calculated to be 0.242 and the half velocity coefficient was 0.3 hr$^{-1}$. The value of endogenous respiration coefficient was 0.02 hr$^{-1}$. The measured effluent BOD concentration, MLSS concentration in aeration tank, oxygen uptake rate, and sludge production were matched relatively well with the calculated values using above coefficients, In order to optimize the dewatering of sludge, the hydraulic retention time was recommended to be 15. 6 hrs. These results indicate that the wastewater from an eletric accessory manufacturing company can be treated safely with a biological process.

• 한국전기전자재료학회논문지
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• 제22권4호
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• pp.327-332
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• 2009

In the devices structure of ITO/N,N'-diphenyl-N,N' bis (3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) /tris (8-hydroxyquinoline)aluminum$(Alq_3)$electron-transport-layer(ETL)(2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP))/Al, we have studied the efficiency improvement of organic light-emitting diodes depending on the thickness variation of BCP using electron transport layer. The thickness of TPD and $Alq_3$ was manufactured 40 nm, 60 nm under a base pressure of $5{\times}10^{-6}$ Torr using at thermal evaporation, respectively. The TPD and $Alq_3$ layer were evaporated to be deposition rate of $2.5{\AA}/s$. And the BCP was evaporated to be a4 a deposition of $1.0{\AA}/s$. As the experimental results, we found that the luminous efficiency and the external quantum efficiency of the device is superior to others when thickness of BCP is 5 nm. Also, operating voltage is lowest. Compared to the ones from the devices without BCP layer, the luminous efficiency and the external quantum efficiency were improved by a factor of four hundred ninty and five hundred, respectively. And operating voltage is reduced to about 2 V.

• 한국유기농업학회지
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• 제27권3호
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• pp.307-325
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• 2019

This study aims to analyze the regional variations in which appear during the formation process of educational community in rural villages from the perspective of regional innovation theory. The study results revealed that the activities to form an educational community of the Songak village significantly influenced the variations across the social, economic and environmental aspects beyond an innovation of public education within the region based on interrelation between schools and villages. In other words, the activities including interactions and group learnings have been actively promoted among the various relevant stakeholders, thereby resulting in a variety of positive variations such as expanded regional welfare base, activated voluntary residents community gatherings based on the unity and cooperation, broadened socioeconomic opportunities, satisfaction on educational and cultural desires, and construction of healthy ecological environment in the region. Therefore, it is thought that regional development policy suitable for each region needs to be established by embracing the fact that activities to form a village educational community entail significant implication and value as the comprehensive regional innovation activities across the entire domains in each region.

• Bulletin of the Korean Chemical Society
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• 제35권12호
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• pp.3595-3600
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• 2014

Monitoring of pH, especially under highly alkaline conditions, is necessary in various processes in the industrial, biotechnological, agricultural, and environmental fields. However, few pH indicators that can function at highly alkaline levels are available, and most of which are organic-based pH indicators. Several years ago, it was reported that gold nanoparticles prepared using trisodium citrate dihydrate were rapidly aggregated at pH values higher than ~12.7. A shift of surface plasmon resonance for such aggregated gold nanoparticles can be applied to pH indicators, allowing for the substitution of traditional organic-based pH indicators. The most important characteristic of pH indicators is the transition pH range. Herein, gold and silver nanoparticles are prepared using different reducing agents, and their transition pH ranges are examined. The results showed that all nanoparticles prepared in this study exhibit similar transition pH ranges spanning 11.9-13.0, regardless of the nanoparticle material, reducing agents, and concentration.

• Archives of Pharmacal Research
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• 제15권1호
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• pp.87-90
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• 1992

The syntheses of novel heterocyclic base modified pyrimidine nucleosides are described. 5, 6-dimethyl-4-hydroxy-3-methoxy-1-$(\beta$-D-ribofuranosyl)2(1H)-pyridinone 7 was synthesized by condensation of silylated 5, 6-dimethyl4-hydroxy-3-methoxy-2(1H)-pyridione 7 was synthesized by condensation of silylated 5, 6-dimethyl-4-hydroxy-3-methoxy-2(1H)-pyridinone with $\beta$-D-ribofuranose-1-acetate-2, 3, 5-tribenzoate in dichloroethane in the presence of Lewis acid followed by debenzoylation. The 2, 2'-anhydro-5, 6-dimethyl-2-hydroxy-3-methoxy-1-$\beta$-D-arabinofuranosyl-4-pyridinone 8 was obtained from the reaction of the free ribonucleoside 7 and diphenyl carbonate in DMF. None of these compounds showed any significant antiviral ad antitumor activities in vitro tests.

• 한국유기농업학회지
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• 제19권4호
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• pp.565-575
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• 2011

Recently, the use of antibiotics to improve animal productivity in livestock industry was strictly restricted. For these reason, probiotics have been regarded as one of promising materials for an antibiotic alternative. In this study, we investigated how the probiotics influences on the performance of broiler chicken via meta-analysis. Eighteen researches from 1997 to 2010 were used for meta-analysis. The standard summary effects were calculated via fixed effect model and random effect model (Borenstein et al., 2009). Heterogeneity was calculated by using the Cochran's Q statistics (Kook et al., 2009) and publication bias was calculated via Egger's regression (Lee et al., 2011). In fixed model average daily gain, body weight serum protein content and cecal LAB showed positive effect significantly. Feed intake, feed/gain and serum cholesterol showed significant negative effect. In serum triglyceride, negative effect was found but significance was not shown. In random model, average daily gain body weight and cecal LAB showed positive effects with significance and feed/gain and serum cholesterol represented significant negative effects. Publication bias was found only in feed/gain.

• 유기물자원화
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• 제21권4호
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• pp.44-49
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• 2013

한국의 중형 소각시설이 전체 소각로 개수의 약 90% 차지하는 실정에서 중형 소각시설의 다이옥신 저감운전기술을 확립하는 것은 매우 시급하다. 생활폐기물과 성상이 유사한 사업장 일반폐기물을 일 20톤 처리용량의 중형규모 구동화격자 스토커 소각시설에서 운전하면서, 각 공정별로 다이옥신 저감을 위한 최적 운전 인자를 도출하였다. CO튀는 현상의 최소가 다이옥신 배출저감에 운전최선책임이 밝혀졌다.