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가속수명시험 (ALT)을 이용한 WOLED의 성능 및 신뢰성 평가
문진철 ( Jin Chel Moon ),박형기 ( Hyung Ki Park ),최충석 ( Chung Seong Chol ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.4
The purpose of this study is to extract the major factors related to the deterioration mechanism of white organic light-emitting diodes (WOLED) by performing accelerated testing of temperature, voltage, time, etc., and to develop an accelerated life test (ALT) model. The measurement results of the brightness of the WOLED exhibited that their average brightness tended to increase as the operating voltage increased and that the half-life period of the brightness appeared after approximately 400 hours when the operating voltage was 20V and the ambient temperature was 85˚C. It could be seen that although the WOLED showed comparatively the same brightness when the initial acceleration began after the operating voltage was applied to it, its brightness changed excessively after the WOLED`s thermal storage had been made. In addition, it was observed that the half-life period was reduced as the ambient temperature and applied voltage increased. The strength of the WOLED which had been maintained in the range of visible light at the maximum load was reduced by the deterioration of the organic light emitting material due to the influence of the operating voltage and temperature, and the reduction of emitted light was small at low voltage and temperature. It could be seen that the failure of the WOLED during the ALT was caused by wear due to load accumulation over time, and that Weibull distribution was appropriate for the life distribution and acceleration was established between test conditions. From the WOLED analysis, it is thought that factors influencing the brightness deterioration are voltage, temperature, etc. and that comprehensive analysis considering discharge control, dielectric tangent margin, etc., would further increase the reliability.
양전자 방출 단층촬영에서 폐암으로 의심되었던 고립 폐 결절 형태의 폐흡충증
문재영 ( Jae Young Moon ),정기환 ( Ki Hwan Jung ),김제형 ( Je Hyeong Kim ),박형주 ( Hyung Joo Park ),김영식 ( Young Sik Kim ),신철 ( Chol Shin ) 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.64 No.2
Pulmonary paragonimiasis continues to be a diagnostically challenging parasitic disease, despite a drastically decreased prevalence in South Korea during the past decade. Pulmonary paragonimiasis is characterized by fever, chest pain, and chronic cough with hemoptysis. Numerous radiographic and computed tomographic findings including the presence of pneumothorax, pleural effusion, and parenchymal lesions such as nodular or infiltrative opacities have been reported. The clinical and radiological manifestations of paragonimiasis can resemble those of lung cancer, tuberculosis or a metastatic malignancy. Furthermore, this disease can mimic lung cancer as seen on 18F-fluorodeoxyglucose positron emission tomography (FDG-PET). We report a case of pulmonary paragonimiasis in a 48-year old man that presented with a solitary pulmonary nodule and was suspected as a lung cancer based on FDG-PET imaging. (Tuberc Respir Dis 2008;64:133-137)
Samsoeum inhibits systemic anaphylaxis and release of histamine, cytokine in vivo and in vitro
Kim, Su-Jin,Kim, Na-Hyung,Moon, Phil-Dong,Myung, Noh-Yil,Kim, Min-Chol,Lee, Ki-Taek,Jo, Hyung-Mook,Kim, Na-Hyun,Rim, Hong-Kun,Seo, Min-Jun,Kim, Jin-Man,Lee, Seung-Eun,An, Nyeon-Hyung,Lee, Kang-Min,Lee Kyung Hee Oriental Medicine Research Center 2009 Oriental pharmacy and experimental medicine Vol.9 No.2
Samsoeum (SSE) is used in traditional oriental medicine for various medicinal purposes. However, the exact mechanism that accounts for the anti-allergy and anti-inflammatory effects of the SSE is still not fully understood. The aim of the present study is to elucidate whether and how SSE modulates the allergic reactions in vivo, and inflammatory reaction in vitro. In this study, we showed that SSE significantly decreased compound 48/80-induced systemic anaphylaxis, ear-swelling response, histamine release from preparation of rat peritoneal mast cells and anti-dinitropheny IgE-induced passive cutaneous reaction. Also, SSE inhibited the expression of inflammatory cytokine and cyclooxygenase-2 in PMA plus A23187-stimulated human mast cells (HMC-1). In addition, we showed that anti-inflammatory mechanism of SSE is through suppression of nuclear factor-${\kappa}B$ activation and $I{\kappa}B-{\alpha}$ phosphorylation/degradation in HMC-1. These results provided new insight into the pharmacological actions of SSE as a potential molecule for therapy of inflammatory allergic diseases.
국내 산란계의 주요 바이러스성 질병에 대한 혈청학적 모니터링 결과 및 분석 (pp.361-372)
이혜림(Hae Rim Lee),김종만(Jong Man Kim),김진형(Jin Hyung Kim),김창문(Chang Moon Kim),소현희(Hyun Hee So),이동우(Dong Woo Lee),하봉도(Bong Do Ha),홍성철(Song Chol Hong),모인필(In Pil Mo) 韓國家禽學會 2010 韓國家禽學會誌 Vol.37 No.4
본 연구에서는 충북대학교 조류질병학실험실에 2009년 한 해동안 의뢰된 산란계의 혈청 검사 결과에 대해 분석하여, 산란계의 주요 질병에 대한 국내 산란계의 면역 상태 및 질병 감염 실태를 파악하였다. 검사 대상 질병은 AI, ND, IB, aMPV, EDS'76, IBD, CIA이었으며, 산란계의 성장 단계에 따라 주령 구간을 나누어 분석하였다. AI, ND, IB는 모체이행항체가 감소한 후 산란 기간에 걸쳐 혈청 역가가 안정적으로 형성되는 특징을 보여 주었다. 그러나 AI는 모든 주령 구간에 걸쳐 음성인 계군이 존재하는 반면, ND는 3~10주령 구간의 한 음성 계군을 제외하고 전 주령에 걸쳐 100%의 계군 양성률을 보이고, ND의 평균 GMT가 AI의 평균 GMT보다 높았는데, 이는 두 질병의 백신 정책의 차이에 기인한 것이다. IB의 산란기의 안정적인 역가는 백신 역가에 산란기 전반에 걸친 야외 감염 개체의 존재로 인한 야외감염 역가가 더해진 것으로 판단된다. aMPV는 2009년에 백신을 실시하지 않았던 질병이므로, 양성 역가를 통해 aMPV의 야외 감염을 추적할 수 있었으며, GMT 변화 및 계군 내양성 개체율의 증가 경향을 통해 일령이 증가할수록 야외감염률이 증가하는 양상을 파악할 수 있었다. EDS'76은 산란 기간에 걸쳐 높은 양성률과 낮은 변이계수를 보여 야외감염이 아닌 백신에 의한 역가 형성이 대부분임을 알 수 있었다. IBD의 모체이행항체는 높은 수준으로 이행되는 것을 확인하였으며, CIA는 백신을 적용하지 않은 계군에서 양성과 음성 계군이 모두 존재하였으며, 그 차이는 차단 방역에 기인하는 것으로 판단되었다. 본 연구를 통하여 국내 산란계에서의 혈청 역가 분포를 파악하는데 많은 정보를 얻을 수 있었으나, 향후 지속적인 야외 계군의 혈청학적 모니터링이 되어야 할 것으로 판단된다. Serological evaluation for the poultry is important for various reasons, such as designing and assessing the vaccination program and diagnosing diseases and for this reason, serologic tests for the layer flocks have been conducted on a regular basis. Moreover, the nationwide serological survey and analysis are essential to understand the epidemiological status of national poultry industry. In this sense, the study was conducted to evaluate the immune status of the layer flocks with the sera submitted to Avian Disease Laboratory, Chungbuk National University in 2009, and several important viral diseases were selected for evaluation including low pathogenic avian influenza (LPAI), Newcastle disease (ND), infectious bronchitis (IB) and avian metapneumovirus (aMPV). For LPAI and ND, the age-related patterns of geometric mean titer (GMT) changes were similar but there were differences in the flock positive rate and the level of GMT due to the different vaccination policy. In the case of IB, the values of GMT showed that the field infection was more prevalent than expected. For aMPV, positive birds in a flock increased as the layers got older, which reflected the course of field infection because vaccination against aMPV was not allowed in 2009. From this study, the immune status for the main viral diseases in layers became more clarified but this information was limited because of only one year study. Therefore, serological survey needs to be conducted on a yearly basis and furthermore include broilers and breeders for a better understanding of the health status in the national poultry industry.