http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
입자 크기 및 분포가 유동층의 압력 요동 특성에 미치는 영향
박상찬,조병렬,홍성선 ( Sang Chan Park,Byung Real Jo,Sung Sun Hong ) 한국공업화학회 1995 공업화학 Vol.6 No.1
기체-고체 유동층에서 압력 요동의 통계적 처리방법을 이용하여 유동층 거동을 해석하였다. 측정압력 요동 통계 특성치는 평균값과 표준편차, power spectral 밀도 함수 등이다. 압력 요동의 표준편차는 최소 유동화 속도를 예측하고 유동화 현상을 설명하는데 효과적이며, 압력 요동의 표준편차와 주진동수는 고체 입자의 크기 및 분포의 영향을 받았다. 압력 요동의 표준편차는 균일계의 경우 입자크기가 증가할수록 증가하였으며, Rosin-Rammler분포와 Gaussian 분포에 대해서는 입자 분포의 표준편차가 클수록 압력 요동의 표준편차가 감소하였다. 압력 요동의 주진동수는 균일계의 경우 입자크기가 증가할수록 감소하였으며, Rosin-Rammler와 Gaussian 분포의 경우에는 분포의 편차가 클수록 증가하였다. The pressure fluctuations in a gas-solid fluidized bed has been analysed using statistical method interpreting fluidized bed behavior. The statistical properties of the pressure fluctuations calculated are the mean, the standard deviation, and the power spectral density function, etc. It has been found that the standard deviation of the pressure fluctuations can be effectively used for predicting minimum fluidizing velocity and explaining the fluidized phenomena. The standard deviation and frequency of the pressure fluctuations have been affected by the particle size and its distributions. The standard deviation of pressure fluctuations have been increased with particle size for its uniform distribution, but have been decreased with deviation of distribution for Rosin-Rammler and Gaussian distribution. The major frequency of the pressure fluctuations have been decreased with increasing particle size for uniform distribution, but have been increased with deviation of distribution for Rosin-Rammler and Gaussian distribution.
과압밀 및 정규압밀영역의 응력상태에 따른 부산점토 장기압밀특성
김윤태(Yun-Tae Kim),조상찬(Sang-Chan Jo) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6
Numerouslong-term consolidation and secondary compression settlements may occur in Busan clay, which is astructured soft clay and consists of a thick clay deposit. As a surcharge load is applied to soils, soils experience different stress paths with depth. Therefore, it is necessary to study the long-term consolidation behavior of Busan clay considering stress conditions such as OC or NC states. In this study, a series of long-term consolidation tests were performed to investigate the consolidation characteristics of Busan clay for 20 days. The undisturbed day samples were taken from 3 sites located in the Nakdang River estuary. The results showed that the creep rate of the Busan clay gradually decreased with time, which indicated that the secondary compression settlement decreased with time. In addition, the experimental results for 3 samples showed that the ratios were about 0.0363 and 0.051, respectively.
최희윤,제갈경환,김영우,이정우,조수아,조일제,김상찬,Choi, Hee Yoon,Jeggal, Kyung Hwan,Kim, Young Woo,Lee, Jung Woo,Jo, Soo A,Cho, Il Je,Kim, Sang Chan 대한한의학방제학회 2013 大韓韓醫學方劑學會誌 Vol.21 No.2
Objectives : Artemisia princeps is used as moxa in moxibustion and traditional herbal medicine. And its extracts or compounds is known to have an efficacy of antioxidant, anti-diabete, anti-cancer, anti-inflammation and neuroprotection. This study was performed to investigate the cytoprotective effect of Artemisia princeps extract (APE) against arachidonic acid (AA)+iron-induced oxidative stress on HepG2 cell. Methods : The effects of APE on cell viability has been assessed using MTT assay. And flow cytometric analysis was performed to estimate APE's effects on mitochondrial function. To investigate its underlying mechanism, related protein was analysed by using immunoblot analysis. Results : Treatment of APE increased relative cell viability, prevented a decline of B-cell lymphoma-extra large (Bcl-xL) and cleavage of poly(ADP-ribose) polymerase (PARP) and procaspase-3, and also protected mitochondrial membrane permeability (MMP) against oxidative stress induced by AA+iron. In addition, APE treatment increased phosphorylation of AMP-activated protein kinase (AMPK) exerts a cytoprotective effect. Conclusions : This results demonstrate that APE has an ability to activation of AMPK which protects cells from AA+iron-induced oxidative stress and restores MMP.
박숙자,이종록,조미정,박상미,변성희,조일제,김상찬,Park, Sook-Jahr,Lee, Jong-Rok,Jo, Mi-Jeong,Park, Sang-Mi,Buyn, Sung-Hui,Cho, Il-Je,Kim, Sang-Chan The Society of Korean Medicine Ophthalmology 2011 한방안이비인후피부과학회지 Vol.24 No.1
Objectives : 판람근(板藍根)은 십자화과에 속하는 대청(大靑) 또는 숭남의 근(根)을 건조한 것이다. 본 연구는 판람근(板藍根)이 청열해독(淸熱解毒)함에 근거하여, LPS로 활성화된 Raw264.7 cell에서 판람근(板藍根)과 그 성분중의 하나인 tryptanthrin이 염증매개물질에 미치는 효과를 살펴보고자 하였다. Methods : 세포생존율은 MTT, nitric oxide (NO)는 Griess reagent를 사용하여 측정하였으며, 각 단백질의 발현량은 Western blot 방법을 사용하였으며, cytokine 및 cyclooxygenase-2 (COX-2)는 ELISA방법을 사용하여 측정하였다. Results : LPS는 NO 및 prostaglandin E2 (PGE2)를 유의하게 상승시켰으며, 판람근(板藍根)추출물 (IRE) 및 tryptanthrin 은 이들을 유의하게 억제하였다. 그러나 판람근(板藍根)의 또 다른 성분인 indigo는 유의한 결과를 나타내지 못하였다. IRE와 tryptanthrin은 inhibitory kappa B alpha의 인산화를 억제하여, nuclear factor-${\kappa}$B (NF-${\kappa}$B)의 핵으로의 전위(轉位)를 억제하여, iNOS 및 cytokine을 억제하였다. IRE와 tryptanthrin의 PGE2 억제는, COX-2의 발현억제에서가 아니라, COX-2의 활성을 억제함에서 기인하였다. Conclusion : 이러한 결과는 판람근(板藍根)이 NF-${\kappa}$B pathway를 경유하여 iNOS의 발현 및 COX-2의 활성을 억제함을 나타내며, 이러한 판람근(板藍根)의 항염증효능은 일부 tryptanthrin의 작용에서 기인함을 시사한다.