Tricaprylmethylammonium Chloride 에 의한 Methyl Methacrylate 의 라디칼 중합

박상욱,문진복,하유수,김종현 ( Sang Wook Park,Jin Bok Moon,Yoo Su Ha,Jong Hyeon Kim ) 한국공업화학회 1993 공업화학 Vol.4 No.2

Na_2S_2O_4 수용액과 CCl_4-toluene 용액의 2상에서 유기상에 용해하는 tricaprylmethylammonium chloride 상이동 촉매를 사용하여 methyl methacrylate의 라디칼 중합속도를 측정하여, 액-액 불균일계 접촉계면을 통한 라디칼 중합반응기구를 해석하였다. MMA의 중합속도는 수용액상에 존재하는 Q^+ 이온의 농도와 S_2O_4^(-2) 이온의 농도의 제곱근에 정비례하고 CCl_4와 MMA의 농도에 각각 정비례하였다. The phase-transfer polymerization of methyl methacrylate with tricaprylmethylammonium chloride-Na_2S_2O_4-CCl_4 initiator system was investigated in an aqueous-organic two-phase system. The observed rates of polymerization were compared with those obtained from the polymerization mechanism proposed with a cyclic phase-transfer initiation step. The rate of polymerization was found to be proportional to the concentration of Q^+ and square root of S_2O_4^(-2) in the aqueous solution and the feed quantity of CCl_4 and MMA.

폴리(펜타메틸렌 2,6-나프탈레이트)의 합성과 열적 특성

박상욱,이경우,김영호,Park, Sang-Wook,Lee, Kyoung-Woo,Kim, Young-Ho 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.2

Poly(pentamethylene 2,6-naphthalate) (PPN) with a intrinsic viscosity of 0.69 dl/g was synthesized from dimethyl 2,6-naphthalene dicarboxylate and 1,5-pentnandiol via a two-step process of transesterification and polycondensation using a high pressure reactor. Manganese acetate tetrahydrate and tetraisopropyl orthotitanate were used as catalysts for transesterification and polycondensation, respectively. Melt-quenched films of the PPN were prepared and annealed under various conditions, and the thermal properties of the annealed films were characterized by using a DSC and synchrotron WAXS. PPN exhibited a very slow crystallization rate. On DSC thermograms, three melting peaks were observed at around $100{\sim}125^{\circ}C$, depending on the annealing conditions. At least more than 6 hours of annealing was needed for the PPN film to be crystallized when it was annealed at a temperature below its melting point, and 3 hours of annealing when annealed at $100^{\circ}C$ which corresponds to the $T_{ml}$. From the results of DSC and WAXS analysis, it is deduced that the continuous increase in crystallinity of PPN with increasing annealing time comes from the increase in the number of crystallites, not from the increase in the crystallite size.

Chemical Reaction of Carbon Dioxide with AMP in w/o Emulsion Membrane

박상욱,최병식,김성수,이재욱,Park Sang-Wook,Choi Byoung-Sik,Kim Seong-Soo,Lee Jae-Wook The Membrane Society of Korea 2004 멤브레인 Vol.14 No.4

본 연구에서는 준 회분식 교반조를 사용하여 polybutene (PB)와 polyisobutylene (PIB)고분자를 용해한 벤젠 용액을 연속상, 물을 불연속상으로 구성한 w/o 에멀션액막에 $CO_2$을 흡수시켜 흡수속도를 측정하였다. 점탄성을 나타내는 Deborah 수를 사용하여 점탄성 비뉴튼액체에서 구한 부피물질전달계수 ($k_La$)를 고찰하고, 수용액에 첨가한 2-amino-2-methyl-1-propanol(AMP)와 $CO_2$의 반응 메카니즘을 해석하였다. Carbon dioxide was absorbed into water-in-oil (w/o) emulsion composed of aqueous 2-amino-2-methyl-1-propanol (AMP) droplets as a dispersed phase and benzene solutions of polybutene and polyisobutylene as a continuous phase in a flat-stirred vessel to investigate the effect of non-Newtonian rheological behavior on the rate of chemical absorption of $CO_2$, where the reaction between $CO_2$ and AMP in the aqueous phase was assumed to be a pseudo-first-order reaction. It was expressed that PIB with elastic property made the rate of chemical absorption of $CO_2$ accelerated by comparison of mass transfer coefficient of $CO_2$ in the non-Newtonian liquid with that in the Newtonian liquid.

불균일계 액 - 액 접촉 계면을 통한 ester 의 알카리 가수분해 반응

박상욱,문진복,고명숙,김건우 ( Sang Wook Park,Jin Bok Moon,Myung Sook Ko,Gun Woo Kim ) 한국공업화학회 1992 공업화학 Vol.3 No.1

Ethyl acetate와 n-butyl acetate의 25℃에서 알카리 가수분해 반응을 개량된 Lewis cell에서 행하여 화학반응을 수반한 물질전달 속도를 측정하였다. 측정한 물질전달 속도는 교반조의 교반속도에 무관하였고 이온강도 증가에 따라 감소하였으나 화학반응촉진 계수는 일정하였다. 측정한 화학반응 촉진계수를 경막설로부터 얻은 용질의 확산방정식의 근사해로부터 해석하여 ester의 알카리 가수분해반응의 2차 비가역 반응속도 정수를 얻을 수 있었으며, 그 값은 ethyl aeetate의 경우 0.041 ㎥/kgmol ·s, n-butyl acetate의 경우 0.338㎥/kgmol ·s 이었다. The rates of mass transfer with the alkaline hydrolysis of ethyl acetate and n-butyl acetate were measured by using a modified Lewis call. The rates of mass transfer with chemical reaction were independent of the speed of agitation, and the reaction enhancement factors were independent of the ionic strength. The second order reaction rate constants of ethyl acetate and n-butyl acetate could be obtained from an approximate solution of a diffusion equation by film theory, and their values were 0.041 ㎥/㎏ mol·s and 0.338 ㎥/kgmol·s, respectively.

산삼 약침이 정상 중년여성의 맥파요인에 미치는 영향

박상욱,김이순,황원덕,김경철,Park, Sang-Wook,Kim, Yi-Soon,Hwang, Won-Deok,Kim, Gyeong-Cheol 대한약침학회 2011 Journal of pharmacopuncture Vol.14 No.1

Objectives: The aim of this experiment is to know about Effect of pulse-wave factors in Middle Aged Women by Mountain Cultivated Ginseng Pharmacopuncture. Methods: First 20 Middle Aged women are diagnosed by pulse diagnosis, and then Mountain Cultivated Ginseng Pharmacopuncture(1 injection 20cc) were injected. 30 minutes later, pulse diagnosis again performed. As a result, method of one-group pretest-posttes design were used for evaluation. Results: T(Total pulse cycle) time statistically significant increased on both left and right chon, kwan, cheok. T4 time statistically significant increased on both left and right chon, kwan, cheok. T4-T1/T indexs except left cheokmaek, Right cheokmaek observation area decreased significantly in four sites. Wm(indicating high pressure retention time) indexs increased significantly in the five sites were observed except right chon maek. Conclusions: Effect of pulse-wave factors in Middle Aged Women by Mountain Cultivated Ginseng Pharmacopuncture increased T, T4, Wm and decreased T4-T1/T indexs. The results of this experiment, Mountain Cultivated Ginseng Pharmacopuncture induced to increase the Pulse-wave's stability and strength.

Glutamate-Induced Serotonin Depletion in Fetal Rat Brainstem Cultures

박상욱,위명복,송동근,김용식,김영희,Park, Sang-Wook,Wie, Myung-Bok,Song, Dong-Keun,Kim, Yong-Sik,Kim, Yung-Hi The Korean Society of Pharmacology 1993 대한약리학잡지 Vol.29 No.2

흰쥐태 뇌간의 세포를 배양하여 glutamate에 6시간까지 노출시 glutamate의 농도 및 노출 시간에 의존적으로 세포내 5-HT 및 5-HIAA의 함량이 감소하였고, 배양액으로 LDH의 유출이 증가하였다. Tetrodotoxin은 glutamate의 작용을 차단하지 못하였다. NMDA 수용체 통로 봉쇄제인 MK-801에 의해 glutamate의 작용이 효과적으로 차단되었고, non-NMDA 길항제인 CNQX는 효과가 없었으므로, serotonin 신경세포에 대한 glutamate의 작용은 NMDA 수용체의 자극에 의한 것으로 사료된다. Exposure of dissociated cultures from fetal rat brainstem to glutamate for upto 6 h decreased cellular contents of 5-hydroxytryptamine and 5-hydroxyindoleacetic acid in a concentration- and time-dependent manner. In addition, glutamate induced lactate dehydrogenase leakage. Tetrodotoxin did not block the effects induced by glutamate. MK-801 $(1{\mu}M)$, an N-methyl-D-aspartate (NMDA) channel blocker, but not 6-cyano-2,3-dihydroxy-7-nitro-quinoxazoline $(CNQX;\;3{\mu}M)$, a non-NMDA receptor antagonist, blocked glutamate-induced effects, indicating that these glutamate-induced responses are mediated through NMDA receptors.

한국산 바구미과(科)(딱정벌레목(目)) 9미기록종(種)에 대한 보고

박상욱,홍기정,신상철,최광식,최원일,Park, Sang-Wook,Hong, Ki-Jeong,Shin, Sang-Chul,Choi, Kwang-Sik,Choi, Won-Il Korean Society of Applied Entomology 2008 한국응용곤충학회지 Vol.47 No.2

본 연구를 통해 바구미과의 Pimelocerus elongates (Roelofs, 1873), Phylaitis maculiventris Voss, 1958, Egiona picta (Roelofs, 1875), Cryptorhynchus electus (Roelofs, 1875), Rhadinopus confinis Voss, 1958, R. sulcatostriatus (Roelofs, 1875), Deiradocranus setosus (Morimoto, 1962), Rhadinomerus annulipes (Roelofs, 1875), R. maebarai Chujo et Voss, 1960 등 9종을 한국에서 처음 보고하며, 분포가 불분명했던 Shirahoshizo hiurai Morimoto는 한국에 분포함을 확인하였다. 이들의 특징에 대한 기술과 형태 사진을 제시하였다. Nine species of Curculionidae, Pimelocerus elongates (Roelofs, 1873), Phylaitis maculiventris Voss, 1958, Egiona picta (Roelofs, 1875), Cryptorhynchus electus (Roelofs, 1875), Rhadinopus confinis Voss, 1958, R. sulcatostriatus (Roelofs, 1875), 1962, Deiradocranus setosus (Morimoto, 1962), Rhadinomerus annulipes (Roelofs, 1875), and R. maebarai Chujo et Voss, 1960 are recorded for the first time in Korea. And the distribution of the species of Shirahoshizo hiurai Morimoto to Korea which its distribution was unclear is confirmed with this report. Habitus photos and descriptions of the species are given.

화학방법에 의한 액 - 액 계면 면적

박상욱,문진복,신정호,박대원,김종현 ( Sang Wook Park,Jin Bok Moon,Jeung Ho Shin,Dae Won Park,Jong Hyeon Kim ) 한국공업화학회 1993 공업화학 Vol.4 No.1

교반기를 사용하여 n-butyl acetate의 알카리 가수분해반응의 액-액 불균일계에서 n-butyl acetate의 총괄물질전달속도를 측정하여 실험변수와의 관계를 고찰하고, 화학반응을 수반한 물질전달기구를 경막설에 적용하여 용질에 대한 확산방정식의 근사해로부터 구한 n-butyl acetate의 반응촉진계수의 이론값과 측정값을 비교하여 물질전달계수를 구하였다. 이로부터 분산용액의 액적 면적을 산출할 수 있었다. The rates of overall mass transfer of n-butyl acetate in the alkaline hydrolysis of n-butyl acetate were measured by using a mechanically agitated vessel in order to get the relationship between the mass transfer rates and experimental variables. The interfacial area between liquid-liquid heterogeneous phases could be obtained by comparing the theoretical values of reaction enhancement factor from an approximated solution of a diffusion equation based on the film theory with the experimental data.

의료용 소프트웨어 산업 동향 및 주요 이슈

박상욱,Park, Sang Wook 한국정보통신학회 2016 한국정보통신학회지 Vol.17 No.2

고고도 장기체공무인기 주익 Spar 비선형 구조 해석

박상욱,신정우,이무형,김태욱,Park, Sang-Wook,Shin, Jeong-Woo,Lee, Mu-Hyoung,Kim, Tae-Uk 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.1

In order to increase endurance flight efficiency of long endurance electric powered UAV, main wing of UAV should have high aspect ratio and low structural weight. Since a spar which consists of thin and slender structure for weight reduction can cause catastrophic failure during the flight, it is important to develop verification method of structural integrity of the spar with the light weight design. In this paper, process of structural analysis using non-linear finite element method was introduced for the verification of structural integrity of the spar. The static strength test of the spar was conducted to identify structural characteristic under the static load. Then, the experimental result of the spar was compared to the analytical result from the non-linear finite element analysis. It was found that the developed process of structural analysis could predict well the non-linear structural behavior of the spar under ultimate load.