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Kim, Mirae,Li, Yongzeng,Peng, Di,Yeom, Eunseop,Kim, Kyung Chun Elsevier 2019 Experimental thermal and fluid science Vol.105 No.-
<P><B>Abstract</B></P> <P>When the circular jet impinges onto a cylinder, the three-dimensional (3D) curved wall jet was attached to the wall due to the Coanda effect and the flow separation was delayed with increasing Reynolds number and impinging angle. These interesting phenomena can be studied in depth through a variety of parameters and measurement methods. Time-resolved stereo PIV measurement was conducted to investigate the 3D flow characteristics with instantaneous velocity and vorticity fields. Pressure sensitive paint (PSP) method was used to examine the pressure distribution on the cylinder surface when a circular jet impinges on it. The effects of the impingement angle, Reynolds number, and diameter ratio between the jet nozzle and the cylinder (d/D) were examined at a fixed nozzle to wall distance ratio of two (H/d = 2). Experimental results show that the pressure gradient in the flow direction decreases and the separation is delayed when the Reynolds number and impingement angle are increased at the same distance ratio. As the diameter ratio decreases with the same impingement angle and Reynolds number, the maximum suction pressure increases, and the pressure gradient in the wall jet flow direction increases. The three-dimensional nature of the surface pressure distribution changes with the flow parameters, which are well explained with three-dimensional flow field measurements in the curved 3D wall jet due to the Coanda effect.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surface pressure distribution was measured when a circular jet impinges on a cylinder. </LI> <LI> Effects of the impingement angle, Reynolds number, and diameter ratio were examined. </LI> <LI> Pressure gradient in flow direction decreases when the impingement angle increases. </LI> <LI> The three-dimensional nature of the surface pressure changes with the flow parameters. </LI> </UL> </P>
Microfluidic method for measuring viscosity using images from smartphone
Kim, Sooyeong,Kim, Kyung Chun,Yeom, Eunseop Elsevier 2018 Optics and lasers in engineering Vol.104 No.-
<P><B>Abstract</B></P> <P>The viscosity of a fluid is the most important characteristic in fluid rheology. Many microfluidic devices have been proposed for easily measuring the fluid viscosity of small samples. A hybrid system consisting of a smartphone and microfluidic device can offer a mobile laboratory for performing a wide range of detection and analysis functions related to healthcare. In this study, a new mobile sensing method based on a microfluidic device was proposed for fluid viscosity measurements. By separately delivering sample and reference fluids into the two inlets of a Y-shaped microfluidic device, an interfacial line is induced at downstream of the device. Because the interfacial width (W) between the sample and reference fluid flows was determined by their pressure ratio, the viscosity (μ) of the sample could be estimated by measuring the interfacial width. To distinguish the interfacial width of a sample, optical images of the flows at downstream of the Y-shaped microfluidic device were acquired using a smartphone. To check the measurement accuracy of the proposed method, the viscosities of glycerol mixtures were compared with those measured by a conventional viscometer. The proposed technique was applied to monitor the variations in blood and oil samples depending on storage or rancidity. We expect that this mobile sensing method based on a microfluidic device could be utilized as a viscometer with significant advantages in terms of mobility, ease-of-operation, and data management.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A smartphone is adopted to measure the fluid viscosity in microfluidic device. </LI> <LI> Viscosity is estimated by measuring interfacial width of sample in reference fluid. </LI> <LI> Proposed method can measure viscosity reasonably compared to a Brookfield viscometer. </LI> <LI> This method can monitor the variations of blood viscosity due to blood storage. </LI> <LI> This method can distinguish degradation of frying oil based on viscosity measurement. </LI> </UL> </P>
근치적 방사선치료를 시행한 제2기의 자궁경부암 환자에서 p53과 Bax의 발현과 임상적 의의
최석진(Sukjin Choi),김헌정(Hunjung Kim),송은섭(Eunseop Song),김창영(Changyoung Kim),이미조(Meejo Lee),김우철(Woochul Kim),노준규(John J K. Loh) 대한방사선종양학회 2005 Radiation Oncology Journal Vol.23 No.2
목 적: 진행된 자궁경부암 환자에서 bax와 p53의 발현 빈도를 방사선치료를 받은 환자를 대상으로 예후인자 로서의 유용성을 알아보기 위하여 본 연구를 시행하였다. 대상 및 방법: 본 연구는 1996년 6월부터 2003년 12월까지 근치적 방사선치료를 받은 FIGO stage IIb의 자궁경부암 환자 65명을 대상으로 면역조직화학 염색을 시행하여 관찰된 bax와 p53의 발현과 환자의 5년 생존율과 무병생존율의 관계를 연구하였다. 결 과: 대상환자 65명에 대한 5년 생존율과 무병생존율은 각각 65.1%와 62.9%였다. p53에 대한 면역조직화학염색은 26.2%의 발현을 보였으며, 음성 환자 군과 양성 환자 군의 5년 생존율은 각각 66.6%와 61.1% (p=0.176)였으나, 무병생존율은 각각 72.1%와 50.9% (p=0.027)로 단변량분석에서 통계학적 차이를 보였다. 면역염색에 대한 bax의 발현은 52.3%에서 양성을 보였으며, 음성 환자 군과 양성 환자 군의 5년 생존율은 각각 68.8%와 63.6% (p=0.726)였으며, 무병생존율은 각각 68.1%와 64.1% (p=0.505)로 통계학적 차이가 없었다. 다변량분석에서는 p53 단백의 발현과 bax의 발현이 생존율에 의미 있는 영향을 주지 못했다. 그러나 p53+/ bax-의 면역화학염색 결과를 보인 9명의 환자에서 의미 있는 가장 낮은 무병생존율을 관찰할 수 있었다.결 론: p53과 bax의 발현은 단독적으로 방사선치료를 시행한 환자에서 유의성을 가지는 예후인자로 사용할수 없었다. 그러나 p53과 bax의 발현을 동시에 평가할 경우 유용한 예후 인자로서 임상적 유용성이 있을 것으로 생각한다. Purpose: The objective ot our study was to evaluate the Immunohistochemical expression 01 p53 and bax proteins as prognostic markers in FIGO stage lib invasive squamous cell carcinoma of Ihe uterine cervix. Malerials and Methods: Sixty-tive cases 01 squamous cell carcinoma of the cervix (stage lib) that were diagnosed from October 1996 to December 2003 were analyzed retrospectively for the bax and p53 expression. These expressions were determined immunohislochemically and they were correlated to the patients' ovemll survival and disease-tree survival. Resuns: The overall 5-year survival (OSI rate and the disease-free survival (DFSI rate were 65. t% and 62.9%, respectively. p53 and bax immunoreactivity was seen in 26.2% and 52.3% of cases, respectively, with vmiable levels 01 expression. On the univmiate analysis, only p53 positivily correlated wilh poor survival in DFS (log-rank test p=0.0271, but this significance was not maintained on multivariated analysis by Cox's regression. The nine cases With the Immunophenotype p53+/bax- had the poorest survival. Conclusion: Neither p53 nor bax expression are independent predictors ot the prognosis for stage lib cervical squamous cancers. Evaluation of p53 and bax co expression may aHect the clinical outcome and further investigation is needed.