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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),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.
한국 독사독으로부터의 혈전 용해제 개발에 관한 연구 2. 살모사 ( A. bromhoffi brevicaudus ) 사독 Protease 의 특성과 혈전 용해능에 관한 연구
김병재(Byoung Jae KIm),이문한(Mun Han Lee),임종섭(Jong Seop Rim),이항(Hang Lee),이혜숙(Hye Suk Lee),김종호(Jong Ho Kim),채창수(Chang Su Chai) 한국응용약물학회 1995 Biomolecules & Therapeutics(구 응용약물학회지) Vol.3 No.2
The biochemical properties of the fibrinolytic protease of 50,800 Da isolated from the venom of Agkistrodon blomhoffi brevicaudus were characterized. The enzyme hydrolyzed the carboxyl side of arginine in the synthetic chromogenic peptides, N-Benzoyl-Phe-Val-Arg-pNA and N p-Tosyl-Gly-Pro-Arg-pNA, and the enzyme activity was inhibited by phenylmethylsulfonylfluoride indicating that the enzyme belongs to the serine protease family. The protease showed maximum activity at pH 7.5 and inhibited by ZnCl₂, CuSO₄, but not by soybean trypsin inhibitor, pepstatin A, 2-mercaptoethanol and EDTA. The Km value determined with Np-Tosyl-Gly-Pro-Arg-pNA was 0.2 mM. The thrombolytic activity of the purified enzyme was evaluated by platelet aggregation test in rabbits. While the platelet count ratio in blood of the rabbits injected with thrombin alone declined from 1.0 to 0.6 within 7 min and maintained around 0.6 for 24 hours thereafter, the ratio rapidly recovered from around 0.6 to 0.8 in 1 hr, to 1.0 in 24 hrs when the rabbits were sequentially treated with thrombin and the purified enzyme. The result showed that the serine protease from A. blomhoffi brevicoudus of 50,800 Da had a thrombolytic activity in vivo and the enzyme might be developed as a therapuetic agent for the treatment of thrombic disease.
김병재 ( Kim Byoung-jae ) 전남대학교 호남학연구원 2022 감성연구 Vol.- No.24
본 논문은 다양한 최신 감정이론들의 관점에서 울분 감정의 본성을 분석하고 이해하는 것을 목표로 한다. 근래에 린든이 “외상후 울분장애(PTED)”라는 정신장애 진단개념을 고안한 이후, 국내외 연구자들은 이 개념을 정신병리학적 차원에서 사회의 다양한 현상들을 진단하고 분석하는 지표로 활용해오고 있다. 그러나 외상후 울분장애의 핵심을 이루는 울분(Embitterment) 감정 그 자체에 대한 철학적 고찰이 충분히 이루어지지 않은 채, 사회과학의 여러 분야에서 실증연구가 진행되고 있는 실정이다. 본 논문은 울분 감정 자체에 대한 지금까지의 유일한 이론적 분석이라 할 수 있는 즈노이의 논의를 소개하고 비판적으로 검토한다. 즈노이는 울분 감정을 인간이면 누구나 경험할 수 있는 일종의 정상감정이자 복합감정으로 보고, 플럿칙의 “기본감정 이론(Basic Emotion Theory)”과 라자루스의 “가늠이론(Appraisal Theory)”에 근거하여 울분 감정을 분석한다. 본 논문에서 필자는 즈노이가 받아들이고 있는 이 플럿칙의 기본감정 이론과 라자루스의 가늠이론이 그리피스의 자연종 논쟁과 베럿의 심리적 구성주의에 의해 어떤 식으로 비판을 받고 있는지를 살펴본 후, 울분 감정을 이해하기 위한 새로운 이론적 접근법으로 “신기본감정 이론(New Basic Emotion Theory)”을 도입할 필요가 있음을 제안할 것이다. This paper aims to improve our understanding of embitterment. Since Linden first coined the term, “post-traumatic embitterment disorder (PTED)”, which is characterised as a kind of psychological disorder, many scholars from various areas in social science have used the concept as a tool to analyse social phenomena. However, our understanding of embitterment, which is the core emotion of PTED, is still poor since there have not been many attempts to ground it theoretically. Znoj’s work is the only meaningful attempt to ground the emotion of embitterment. He understands embitterment both as a complex emotion following Plutchik’s basic emotion theory and as a normal adopting Lazarus’s appraisal theory. This paper argues that since the idea that emotion is a natural kind, which is shared by both Plutchik’s basic emotion theory and Lazarus’ appraisal theory, has been defeated by both Griffiths’s and Barrett’s criticism, Znoj’s understanding of embitterment is groundless. Furthermore, this paper proposes that the New Basic Emotion Theory can be a good alternative to ground the emotion of embitterment.
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.
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.
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.