시︱최형철

최형철 새얼문화재단 2000 황해문화 Vol.29 No.-

최형철의 그림일기 | 순교자 - 에밀 놀데의 자극

최형철 대한기독교서회 2003 基督敎 思想 Vol.47 No.10

영어학습을 위한 컴퓨터 프로그램

최형철 한국영어어문교육학회 1995 영어어문교육 Vol.1 No.-

중국식 사회주의와 그 정치적 의미에 관한 연구

최형철 경희대학교 한국정치연구소 1996 한국정치연구 Vol. No.

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볼록한 표면위에 분사되는 원형경사충돌제트의 국소열전달계수 측정에 관한 연구

최형철,이세균,이상훈,임경빈 대한설비공학회 1999 설비공학 논문집 Vol.11 No.6

Measurements of the local heat transfer coefficients were made on a hemispherically convex surface with a round oblique impinging jet. The liquid crystal transient method was used for these measurements. This method, which is a variation on the transient method, suddenly exposes a preheated wall to an impinging jet while video recording the response of liquid crystal for the surface temperature measurements. The Reynolds number used was 23000 and the nozzle-to-surface distance was L/d=2, 4, 6, 8, and 10 and the jet angle was $\alpha$=$0^{\circ}\; 15^{\circ}\;30^{\circ}C\; and \;40^{\circ}C$. In the experiment, the Nusselt number at the stagnation point decreases as the jet angle increases and has the maximum value for L/d=6. The X-axis Nusselt number distributions exhibit Secondary maxima at $0^{\circ}C\re $\alpha$\re 15^{\circ}C, L/d\le6$ for X/d<0(upstream) and at $0^{\circ}C\re $\alpha$40^{\circ}C,\;L/d\le4\;and\; at\; 30^{\circ}C\re $\alpha$$\leq$40^{\circ}C,\;L/d\le 6 $for X/d>0(downstream). The secondary maxima occurs at long distance from the stagnation point as the jet angle increases or the nozzle-to-surface distance decreases. The Y-axis Nusselt number distributions exhibit secondary maxima at Y/d=$\pm$2 for $0^{\circ}C\le a\le30^{\circ}C\; and\; L/d\le4, and \;for\;$\alpha$=40^{\circ}C$and L/d=2. The displacement of the maximum Nusselt number from the stagnation point increases as the jet angle increases or the nozzle-to-surface distance decreases and the maximum distance is about 0.67 times of the nozzle diameter. The ratio of the maximum Nusselt number to the stagnation Nusselt number increases as the jet angle increases.

에탄올이 유기인제 농약에 의한 Cholinesterase 불활성화에 미치는 영향

최형철,김종호,하정희,이광윤,김원준,우현재,허창욱,손수민,천은진 영남대학교 의과대학 1999 Yeungnam University Journal of Medicine Vol.16 No.2

Background: In korea the agricultural community widely uses organophosphorous, and organophosphorous poisonings are increasing every year. We compared change in activity of acetylcholinesterase and pseudocholinesterase by organophosphorous and by the interaction of ethanol and organophosphorous. We also compared the effect of reversible anticholinesterase drugs, physostigmine and neostigmine. The object of this study is to investigate the effects of several anticholinesterase drugs and on how ethanol influences the activity of cholinesterase. Materials and Methods: Fifteen male university students were randomly selected, and blood samples were taken from the antecubital vein. The acetylcholinesterase in the RBC and the pseudocholinesterase in the serum were extracted and separated. The enzyme activity change was measured by the electrometric method. After adding acetylcholine, the pH change was measured with a pH meter. Results and Conclusion: Our results indicated that reversible anticholinesterase drugs decreased the cholinesterase activity more efficiently than organophosphorous. The acetyl cholinesterase and pseudocholinosterase activity were decreased by ethanol. When ethanol was added, oxime a cholinesterase activator, increased acetylcholinesterase activity but does not increased pseudocholinesterase activity.

항콜린에스테라제 약물의 소화관 운동성에 대한 영향

최형철,김종호,하정희,이광윤,김원준,곽동석,김성희,송필현,여지현 영남대학교 의과대학 1999 Yeungnam University Journal of Medicine Vol.16 No.2

Background: Anticholinesterase drug inhibits acetylcholinesterase(AChE), induce accumulation of acetylcholine(ACh) near cholinergic receptors and cholinergic stimulation. This experiment was performed to study the effects of anticholinesterase drugs on gastric motility and the effect of ethanol on anticholinesterase drug-induced motility change. Materials and Methods: After excision of stomach, 2×10mm circular muscle strips were made, which were then fixed to the isolated muscle chamber. An isometric tension transducer was used to measure the contraction change of the gastric smooth muscle strips after drug addition. Results: Fenthion, an irreversible anticholinesterase drug, increased ACh induced contraction of gastric smooth muscle strips and PAM, a cholinesterase activator, antagonized this action. Physostigmine, a reversible anticholinesterase drug, also increased the ACh induced contraction. The gastric motility was decreased by PAM. Ethanol, which is known to induce smooth muscle relaxation, inhibited the increase of contraction by fenthion. Conclusion: These results indicate that irreversible and reversible anticholinesterase drugs increase gastric motility and antagonized by cholinesterase activating drugs. And when exposed to both ethanol and anticholinesterase drug, gastric motility was decreased by the smooth muscle relaxation effect by ethanol.

수상 태양광발전 상용화 기술 개발

최형철 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11

순산소 연소를 위한 초저온 공기분리장치의 엑서지 분석

최형철,문흥만,조정호 한국가스학회 2019 한국가스학회지 Vol.23 No.1

In order to solve the global warming and reduce greenhouse gas emissions, CO2 capture technology was developed by applying oxy-fuel combustion. But there has been such a problem that its economic efficiency is low due to the high price of oxygen gases. ASU is known to be most suitable method to produce large quantity of oxygen, to reduce the oxygen production cost, the efficiency of ASU need to be improved. To improve the efficiency of ASU, exergy analysis can be used. The exergy analysis provides the information of used energy in the process, the location and size of exergy destruction. In this study, the exergy analysis was used for process developing and optimization of large scale ASU. The process simulation of ASU was conducted, the results were used to calculate the exergy. As a result, to reduce the exergy loss in the cold box of ASU, a lower operating pressure process was suggested. It was confirmed the importance of heat leak and heat loss reduction of cold box. Also, the unit process of ASU which requires thermal integration was confirmed.

새로운 조성을 갖는 고형 탈묵제의 제조

최형철,남기대,정노희 한국공업화학회 2003 공업화학 Vol.14 No.3

펄프섬유로부터 잉크입자를 효율적으로 제거하여 잉크함량이 적고 백색도가 높은 재생펄프용 탈묵제를 제조하였다 본 연구의 또 다른 목적은 고백색도에 필요한 여러 계면활성제의 적정조건을 찾고 재생펄프의 수율을 높이는 것이다. 본 연구에서 우리는 우수한 탈묵효과를 위해 스테아르산과 여러 유형의 계면활성제를 사용하였다. 그리고 탈묵효율에 미치는 여러 가지 고형 탈묵제의 효과를 알기 위하여 부상탈묵실험을 수행하였다. 그 결과 고백색도와 높은 수율을 얻을 수 있는 새로운 고형 탈묵제의 적절한 조합조성은 스테아르산 75%와 폴리옥시알킬렌알킬아릴에테르 6%를 혼합한 것이었다. 또한 탈묵효과를 폭넓게 적용하기 위해 기포력과 피 안정도, 분산능을 테스트하였다. 새로운 타입의 탈묵제는 폐지 탈묵시 우수한 분산능과 적당한 기포력과 안정성을 나타내었다. A new feinting agent for recycling of waste paper was produced. This agent efficiently removed ink particles from the pulp fiber and the resulting recycled pulp had a high brightness and a low content of residual ink. Efforts were made to find an optimum condition of various surfactants used for high brightness and yield of recycled pulp. In this study, stearic acid was used for various types of general surfactants for deinking. Flotation deinking experiments were conducted in order to examine the effect of various solid-type deinking agents. As a restult, an optimum combination of this new solid-type deinking agent, which resulted in high brightness and yield, was 75 wt% stearic acid mixed with 6wt% polyoxyalkylene alkyl aryl ester. This new type deinking agent had good dispersability, suitable foaming power and foam stability in deinking of waste paper.