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김병재(Byoung Jae Kim),성형진(Hyung Jin Sung) 한국가시화정보학회 2006 한국가시화정보학회지 Vol.4 No.2
We have evaluated the performances of the following six interpolation schemes used for window deformation in particle image velocimetry (PIV): the linear, quadratic, B-spline, cubic, sinc, Lagrange interpolations. Artificially generated images comprised of particles of diameter in a range pixel were investigated. Three particle diameters were selected for detailed evaluation: pixel with a constant particle concentration 0.02particle/pixel2. Two flow patterns were considered: uniform and shear flows. The mean and random errors, and the computation times of the interpolation schemes were determined and compared.
4-Arm 스타형과 선형 블록 공중합체의 구리 프탈로시아닌 분산 연구
김병재(Byoung Jae Kim),정종화(Jong Hwa Jeong),정지혜(Ji Hye Jung),김봉수(Bong Soo Kim),정기석(Ki Suck Jung),백현종(Hyun Jing Paik) 한국고분자학회 2014 폴리머 Vol.38 No.5
본 연구에서는 잘 규정된 4-arm 스타형 및 선형 고분자를 합성하여 구조에 따른 구리 프탈로시아닌(CuPc)의분산 안정성을 비교하였다. 분산제는 (2-dimethylamino)ethyl methacrylate(DMAEMA)와 poly(ethylene glycol)methyl ether methacrylate(PEGMA)를 사용하여 activators generated by electron transfer(AGET) 원자이동라디칼중합법(ATRP)으로 합성하였다. 합성된 고분자는 젤투과 크로마토그래피(GPC)와 핵자기 공명 분광법(NMR)을 사용하여 합성한 고분자들의 분자량 및 단량체의 조성을 결정하였다. 4-Arm 스타형 고분자 및 선형 고분자 분산제에서stabilizing group인 PEGMA의 중합도를 조절하여 copper phthalocyanine(CuPc)의 분산 안정성에 미치는 영향을 연구하였다. PEGMA의 DP가 130인 4-arm 스타형 고분자를 사용한 경우 25 ℃에서 7일 동안 CuPc의 분산상이 안정적으로 유지되었다. Well-defined star shaped and linear block copolymers were synthesized to study the dispersion stability of copperphthalocyanine (CuPc). We synthesized dispersants using (2-dimethylamino) ethyl methacrylate (DMAEMA) andpoly(ethylene glycol) methyl ether methacrylate) (PEGMA) by activators generated by electron transfer (AGET) atom transfer radical polymerization (ATRP). pDMAEMA-b-pPEGMA copolymers were characterized by GPC and NMR. Furthermore, we studied the effect of the dispersion stability of copper phthalocyanine by controlling the degree of polymerization of PEGMA as a stabilizing group. The 4-arm star shaped polymeric dispersant showed better dispersion stability of CuPc at 25 oC for 7 days.
김병재(Byoung Jae Kim),이승현(Seung Hyun Lee),성형진(Hyung Jin Sung) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.4
The flow rate is higher in ACEO micro-pumps with step electrodes than in micro-pumps with planar asymmetric electrodes. In the present study, numerical simulations were made of a ACEO micro-pump with step electrodes to investigate the effects of electrode design parameters on the pumping flow rate. The electrical charge at the electrodes, the fluid flow, and potential were solved, taking into account the finite size of ions, that is, the steric effect. This effect is recognized to be capable of quantifying the electrical charge more accurately in the electrical double layer subject to high voltages. Geometrical parameters such as heights, widths, and gaps of three-dimensional electrodes were optimized to enhance the pumping flow rate. Moreover, the effect of amplitude and frequency of AC was studied.
김병재(Byoung Jae Kim),윤상열(Sang Youl Yoon),성형진(Hyung Jin Sung),Charles G. Smith 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This study proposes ideas for simultaneous mixing and pumping using asymmetric microelectrode arrays. The driving force of the mixing and pumping was based on electroosmotic flows induced by AC (alternating current) electric fields on asymmetric microelectrodes. The key idea was to bend/incline the microelectrodes like diagonal/ herringbone shapes. These microelectrode patterns forced fluid flows in the lateral direction leading to mixing and in the channel direction leading to pumping. The performances of the mixing and pumping were assessed in terms of the mixing efficiency and the pumping flow rate. The results indicated that the helical flow motions induced by the electrode arrays play a significant role in the mixing enhancement. The pumping performance was influenced by the slip velocity at the center region of the channel compared to that near the side walls.
미소입자영상유속계를 이용한 굴절률이 다른 두 유체 유동 측정
김병재(Byoung Jae Kim),유임정(Ying Zheng Liu),성형진(Hyung Jin Sung) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
The influence of property difference in refraction index on micro PIV measurement of two-fluid flow in a microchannel was analyzed. The difference of measurement planes in two fluids would bring misunderstanding of the physics. The objective-imaging system for two-fluid flow measurement was presented, and the condition for measurement of valid velocity profile across two-fluid interface was derived. A micro PIV experimental system was set up to measure two-fluid flow inside a Y-shape microchannel. Under the conditions, three cases of two-fluid flow of glycerol solutions at different concentration (φ), e.g., φ = 0 and φ = 0.2, φ = 0.1 and φ = 0.5, and φ = 0 and φ = 0.6, were measured. Close agreement of experimental and numerical results was found.
초음파검사에 의한 임신 중기 한국인 태아의 임신주수별 태아성장지표의 정상치에 관한 연구
김병재(Byoung Jae Kim),이정렬(Jung Ryeol Lee),김대호(Dae Ho Kim),왕수관(Soo Kwan Wang),고은미(Eun Mi Ko),심순섭(Soon Sup Shim),한수연(Soo Yeon Han),박중신(Joong Shin Park),전종관(Jong Kwan Jun),윤보현(Bo Hyun Yoon),문신용(Shin Yong M 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.1
N/A Objective : This study was done to formulate Korean fetal biometry charts of midtrimester presenting percentile values as a function of gestational age. Methods : The relationships between the ultrasound measurement of 5 fetal parameters (biparietal diameter, head circumference, abdominal circumference, femur length, transverse cerebellar diameter) and nuchal skinfold thickness and menstrual age were determined by a cross-sectional study. The study group consisted of 215 normal healthy pregnant Korean women with known last menstrual period and regular menstrual period who had been performed genetic amniocentesis at our hospital and for whom complete pregnancy outcome information was available. All ultrasound examination was performed by one expert examiner. For each of the 5 parameters, the 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentiles were determined. Results : Ready-to-use fetal measurement charts in midtrimester are presented in a format giving the percentile values as a function of gestational age. Conclusion : These fetal biometry charts, obtained from midtrimester, Korean women can be used as a reference value