Recently, the phosphorescent organic light-emitting devices (OLEDs) have been extensively studied for their high internal quantum efficiency. In this study, we synthesised several phosphorescent metal complexes, and certified their composition using NMR. We also investigated the characteristics of the phosphorescent OLEDs with the green emitting phosphor, Ir(ppy)3. The devices with a structure of indium-tin-oxide(ITO)/N,N'-diphenyl-N,N'-(3-methylphenyI-1,1'-biphenyl-4,4'-diamine (TPD)/metal complex doped in host materials/2,9-dimethyl-4,7-diphenyl-l,10-phenanthroline(BCP)/tris (8-hydroxyquinolinato) Aluminum(Alq3)/Li:Al/Al was fabricated, and its electrical and optical characteristics were studied. By changing the doping concentration of tris(2-phenylpyridine)iridium (Ir(ppy)3), we fabricated several devices and investigated their characteristics.

By fabricating the organic light-emitting devices (OLEDs) based on phosphorescent material, the internal quantum efficiency can reach 100%, compared to 25% in the case of the fluorescent material. Thus, the phosphorescent OLEDs have recently been extensively studied and showed higher internal quantum efficiencies then the conventional OLEDs. In this study, we investigated the characteristics of the phosphorescent OLEDs, with the green emitting phosphor, Ir(ppy)3, (tris(2-phenylpyridine)iridium). The devices with a structure of ITO/TPD/Ir(ppy)3 doped in the host material /BCP/Alq3/Li:Al/Al were fabricated, and its electrical and optical characteristics were studied. By changing the doping concentration of Ir(ppy)3, we fabricated several devices and investigated the device characteristics. OLEDs doped into BCP by 10% showed the best characteristics. For 10% doped OLEDs, the maximum luminance of was over 10000 cd/m2, and the maximum power efficiency was 7.14 lm/W.

석유화학 공업으로부터 생산되는 방향족 탄화수소 화합물질들은 여러 가지 산업과정에서 널리 활용되고 있으나, 자연계에 오염될 때에는 쉽게 분해되지 않는다는 점에서 환경 오염물질로 주목받고 있다. 방향족 탄화수소 물질의 미생물 분해는 산화반응에 의한 benzene고리의 개환으로부터 시작되기 때문에 이 개환 작용을 갖는 미생물의 분리와 함께 그 분해 기능을 연구하는 것은 매우 중요한 일이다. 본 연구에서는 여천 화학공업단지 폐수로부터 benzoate와 cate

도시생태계는 주 구성원인 인간의 사회구조와 경제활동이 주축이 되고, 부 구성원인 자연이 주 구성원과 상호관계를 받으면서 존재하는 실체이다. 도시 생태계는 사회구조와 경제활동이 일어나는 핵심부와 그것과 직접 관계하는 기초부 및 물질과 에너지의 공급원, 수용원 및 축적을 담당하는 외부환경의 세 부위로 구성되는, 사회-경제-자연-복합 생태계SENCE)로 이해할 수 있다. 도시생태계는 자연생태계의 원리에 따라 기능을 조절하고 시스템모델 기법으로 분석할 수 있다. 도시생태계의 범위는 그 크기, 독립영양과 종속영양의 평형, 기능적 활성 및 발달단계에 따른 ㅗ이부환경(입력환경과 출력환경)의 변화에 의하여 크게 달라진다. 생태학자나 환경학자는 도시생태계를 자연만을 대상으로 연구하였지만 앞으로는 사회학자와 공동으로 연구하여야 문제의 정곡에 접근할 수 있을 것이다.

산수유 열수추출물의 혈전용해활성을 탐색하고, 유기용매로 분획화한 에틸아세테이트(ethyl acetate) 분획물에서 1.36 plasmin units/mL의 강한 혈전용해활성을 확인하였다. Amberlite IRA-400, Sephadex LH-20 column, active charcoal column 과 재결정으로 정제한 혈전용해화합물을 HPLC로 분석 비교한 결과, 표준물질인 malic acid와 같은 retention time (RT)을 나타내고, LC/MS/MS 분석의 Negative mode 측정 시 m/z 133에서 같은 peak를 나타내어 정제한 화합물이 분자량 134 Da인 malic acid 임을 확인하였다. 정제한 화합물은 0.69 plasmin units/mL의 혈전용해활성을 보이고, 14.62%의 트롬빈 저해활성을 나타냈으며, 6.42%의 항산화 효과와 17.28%의 항당뇨 효과를 나타냈다. 분리한 화합물은 섬유소원의 Aα chain, Bβ chain과 반응하지 않았지만 γ chain을 분해하는 것으로 나타났다. 위 연구 결과를 바탕으로 산수유에서 분리한 혈전용해화합 물은 혈관계 질환의 치료제 개발과 기능성 식품 개발을 위한 우수한 소재로 이용 가능할 것으로 예상된다.

Paeonia japonica is a perennial flowering plant used in traditional medicine therapy. The purpose of this study was to investigate the effect of water extract and solvent fractions obtained from P. japonica on anti-oxidative, anti-thrombin, anti-invasive and pro-apoptotic activities in YD-10B cells, human oral squamous carcinoma cell line. Water fraction revealed the highest extraction yield at 11.44% (w/w). Anti-oxidative activity was the highest in ethyl acetate fraction (85.13%). In the thrombin inhibitory activity test, ethyl fraction was the highest, with a value of 87.54%. Release and activation of MMP-2/pro-MMP-2 ratio in thrombin-treated YD-10B cells were significantly inhibited in the ethyl acetate fraction. At a concentration of 120 ㎍/㎖, water extract and solvent fractions of P. japonica inhibited cell proliferation in YD-10B cells except water fraction. Pro-apoptotic effect on human oral squamous carcinoma cell using the Bax/Bcl-2 ratio analysis was higher in water extract than other fractions. These findings suggest that the ethyl acetate fraction of P. japonica potentiates a promising antioxidant, anti-thrombin and anti-invasive agents.

This study investigated the effect of various buried depth(0.8m, 1.0m, 1.2m) on the stress distribution of gas pipe. Numerical analysis and field tests were carried out with API 5L steel gas pipes. From the results, it can be suggested that field test results including compaction energy can represent the stress distribution of gas pipe more precisely.

While carrying out a series of study for improving the durability of High Volume Admixture Concrete using the ERCO, we found that the resistance of freezing and thawing declined due to the decrease of air amount in concrete when using the ERCO. In order to solve the problem, we carried out an experiment using the DEM. As a result of that, it did not affect the basic characteristic of concrete, and the problem of decreasing air amount caused by using the ERCO is also considered to be solved by securing the target air amount.

This study is intended to analyze the stress distribution of gas pipe buried in soft ground. A numerical analysis was carried out with API 5L X 65 steel gas pipe. The analytical model describes the typical cohesive sediment bed in domestic southwest coast, and embankment load is adopted for this research. Compared with residual soil conditions, the effective stress increases by 23∼26%. From the results, it can be suggested that the difference in soil stiffness would significantly affect the stress distribution of gas pipe buried in soft clay.

This paper is to investigate experimentally the effect of waste cooking oil on compressive strength and chloride penetration resistance of high volume fly ash and blast furnace slag concrete. According to results, the incorporation of waste cooking oil resulted in an improvement of penetration resistance of chloride.

This study investigates the effect of emulsified refined cooking oil (ERCO) on the fundamental properties of cement paste, and their results are compared with that of shrinkage reducing admixture (SR). Results showed that ERCO decreased early strength, but retained the strength at the later age of 28 days, slightly higher than pure OPC

This study investigates the effect of surface coating materials on the level of resistance of concrete carbonation. For the surface coating materials, paint (Pa), waste cooking oil (WCO) and waste cooking oil + paint (WCO + Pa) were prepared and applied on the surface of concrete specimens after exposure to accelerated carbonation environment for four weeks.

In previous research, it was found that waste oil was effective on resisting carbonation of concrete. This study is to find the effect of waste oil on the fundamental properties of concrete when blast furnace slag with high volume is used as a partial replacement of cement. Test results showed that the addition of waste oil in the concretes decreased slump and air content, but further reduction was not observed as the amount of the waste oil further increased. In addition, the waste oil had a little impact on deteriorating the compressive strength of the concretes.

This program has been developed for the efficient maintenance of gas supply facilities, consists of inspection and diagnosis program and DB management program. Especially by taking advantage of the Tablet PC maximize the efficiency of the work. also, relevant technician has been developed to be easy to use. Using the data obtained was the development of automatic computation module enables the rapid and reliable assessment of gas supply facilities.

In this paper, microscopic observation of the high strength concrete subjected to elevated temperature ranged from 300~900℃ was conducted by applying SEM and MIP. According to results, an increase of temperature above 300℃ resulted in an increase of microcrack, which makes the accumulative pore amount increased.