• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.89-92
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• 2009

In this paper, We observed degradation of general poly-cristalline silicon solar cell by light and heat. This is very important to define solar cell's characteristics. So we test eight cells that made of poly-cristalline silicon. We expect to the result of this experiment is useful for researching and measuring solar cell's characteristics.

• 전기학회논문지P
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• 제58권4호
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• pp.639-643
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• 2009

A reformer, which produces hydrogen from natural gas, plays a major role for producing quality hydrogen to fuel-cell system. In this paper, fuel processor is designed to deliver hydrogen(75%) from the reformer to 200W fuel-cell system, and the electrical output power of the fuel-cells is examined by being injected different hydrogen concentrations to the system. We verified that the output power characteristics of the fuel-cells with 75% reformed hydrogen was lower about 7% than the case of pure hydrogen supplied. The type of reformer in this experiment takes SMR(Steam methane reforming) process, and the temperature variation characteristics of reforming process by reactions are examined in operation.

• 한국전기전자재료학회논문지
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• 제22권1호
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• pp.93-97
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• 2009

We analyzed voltage characteristics of toner particle type display according to particle layers and cell gap between two electrodes and ascertained the aging effects by measuring the response time of particles with and without aging process. The threshold/driving/breakdown voltage is proportional to layers of toner particles and cell gap and the response time at driving voltage is faster than that of threshold and breakdown voltage because of different q/m of color and black particles. The analysis of response time is a method of estimation of optical characteristics, driving voltage and particle lumping and these results are promoted by aging process. We use the laser and photodiode to measure response time and optical properties. It has not been studied and reported to analyze the relationship of response time, threshold/driving/breakdown voltage, lumping phenomena, cell gap, and aging process for toner particle type display.

• 한국추진공학회지
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• 제5권1호
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• pp.10-17
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• 2001

본 논문에는 러시아 중앙엔진연구소의 스크램젯 시험 설비의 공력 특성이 제시되었다. 본 논문에서 시험 설비 노즐 출구의 온도와 마하 분포는 마하 6의 비행 조건을 시뮬레이션하여 얻어진 것이다. 시험 설비 작동 범위에 스크램젯 모델을 설치한 조건에서 노즐 입구로 공기를 가열하지 않은 조건과 가열한 조건에서 분사함으로써 다양한 작동 모드의 유효 압력 차와 조절 특성을 얻었다.

• 한국전기전자재료학회논문지
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• 제24권9호
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• pp.744-749
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• 2011

Recently, annual usage of energy is dramatically increasing because industrialization is going faster and more electricity is needed due to various electronic devices. This study focused on the performance characteristics of solar cell using the impedance technique. The experiment measured an impedance according to frequency's from 2 mHz until 1 MHz. It could know that the impedance was decreased according to the frequency increases in solar cell. The imaginary part was changed from capacitance component to inductance component.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.388-391
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• 2009

In this paper, We observed spectral responsivity of general poly-cristalline silicon solar cell. This is very important to define solar cell's characteristics. So we tested two small modules that made of poly-cristalline silicon solar cells. We expect to the result of this experiment is useful for researching and measuring solar cell's characteristics.

• 한국지반공학회논문집
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• 제27권10호
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• pp.45-54
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• 2011

본 연구에서는 세립토인 카올리나이트와 매립석탄회를 혼합하여 일반적인 준설토와 매립석탄회를 혼합한 매립지반의 압밀특성을 살펴보았다. 인공 혼합토를 성형하기 위하여 퇴적 토조를 제작하여 카올리나이트 슬러리에 석탄회를 30% 혼합하여 동일한 응력이력을 가지는 시료를 성형하였다. 매립지반의 연직방향과 횡방향의 압밀 및 압축 특성을 알아보기 위하여 표준압밀시험과 Rowe Cell 압밀시험을 수행하였다. 표준압밀시험 시험 결과, 점토 시료에 비하여 매립석탄회를 같이 혼합하는 것이 낮은 압축성과 높은 압밀계수틀 갖게 되어 매립지반의 조기 안정화에 도움을 줄 수 있을 것으로 판단된다. 또한 연직배수재 설치시 횡방향 압밀 특성을 파악하기 위하여, Rowe cell 시휘에서 연직배수재를 설치하여 암밀시험을 수행하였다. Rowe cell 시험결과, 혼합토의 횡방향 압밀계수 또한 순수 카올리나이트 시료에 비하여 높은 값을 나타내어 매립회의 혼합이 압밀시간을 단축시킬 수 있는 것으로 나타났다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권5호
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• pp.2579-2581
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• 2016

Background: Neuroendocrine tumors represent 20% of primary lung neoplasms in some registries. According to the WHO classification of 2004, reconsidered for 2015, these lung tumors are divided into 4 groups: typical and atypical carcinoid, small cell and large cell neuroendocrine carcinomas. We report in this paper, for the first time in Lebanon, the distribution and the population characteristics of these tumors. Materials and Methods: This descriptive retrospective study concerned all the pulmonary neuroendocrine tumors (NET) with their characteristics diagnosed in $H\hat{o}tel$ Dieu de France in Beirut, Lebanon from 2001 to 2012, with attention to features like age, gender and subgroup. Results: Of 194 patients with pulmonary NET, 12.4% were typical carcinoid tumors, 3.6% atypical carcinoid, 66.5% small cell lung cancer, 7.7% combined small cell carcinomas and 9.8% large cell neuroendocrine tumors. The mean ages of patients were respectively 51.2 years in typical carcinoid, 64 years in atypical carcinoid, 64.2 years in small cell lung cancers, 67.2 in combined small cell lung cancer and 66.9 in large cells neuroendocrine tumors. The M/F sex ratios were respectively 0.3, 1.3, 1.4, 2.7 and 2.2. Conclusions: The characteristics of lung neuroendocrine tumors in our Lebanese institution are comparable to those reported in the literature.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권5호
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• pp.609-614
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• 2014

The fringe field effects on the transient characteristics of nano-electromechanical (NEM) memory cells have been discussed by using an analytical model. The influence of fringe field becomes stronger as the size of a cell decreases. By using the proposed model, the dependency of NEM memory transient characteristics on cell parameters has been evaluated.

• 한국발생생물학회지:발생과생식
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• 제15권4호
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• pp.339-347
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• 2011

Human eyelid adipose-derived stem cells (hEAs) and amniotic mesenchymal stem cells (hAMs) are very valuable sources for the cell therapeutics. Both types of cells have a great proliferating ability in vitro and a multipotency to differentiate into adipocytes, osteoblasts and chondrocytes. In the present study, we evaluated their stem cell characteristics after long-time cryopreservation for 6, 12 and 24 months. When frozen-thawed cells were cultivated in vitro, their cumulative cell number and doubling time were similar to freshly prepared cells. Also they expressed stem cell-related genes of SCF, NANOG, OCT4, and TERT, ectoderm-related genes of NCAM and FGF5, mesoderm/endoderm-related genes of CK18 and VIM, and immune-related genes of HLA-ABC and ${\beta}$2M. Following differentiation culture in appropriate culture media for 2-3 weeks, both types of cells exhibited well differentiation into adipocyte, osteoblast, and chondrocyte, as revealed by adipogenic, osteogenic or chondrogenic-specific staining and related genes, respectively. In conclusion, even after long-term storage hEAs and hAMs could maintain their stem cell characteristics, suggesting that they might be suitable for clinical application based on stem cell therapy.