리튬-필로카르핀 경련모델의 특징 : 행동양상, 뇌파, Fos단백의 발현 및 신경병리학적 변화 Behaviors, Electroencephalography, Fos Expression, and Neuropathologic changes

김영인,이광수,김범생,김용재,천명훈,김명석 대한신경과학회 1996 대한신경과학회지 Vol.14 No.1

Polystyrene-Glass bead 分散系의 粘彈性에 關한 硏究

金春泳 全北大學校 1984 論文集 Vol.26 No.-

The influence of solid fillers on the rheological properties of molten polymers is both great scientific interest and importance in industrial application. An experimental study was carried out to investigate the viscoelastic behavior of glass bead-filled polystyrene melts, using Sieglaff-McKelvey capillary rheometer. The influence of filler concentration, temperature, and the ratio of length to diameter of capillary on shear viscosity were discussed. As a result, increasing filler loading increased the shear viscosity and at moderate and high filler loadings, the filled melts showed yield values. Based on the experimental data, an equation which correlates relative viscosities as a function of filler concentration was proposed. n_r=1+2.5ø+0.0548 exp (9.90ø) This result reduces to Einstein's solution at infinite dilution. The melt viscosity was decreased as temperature increased. The general validity of a shear rate-temperature superposition of log (shear stress) vs. log (dhear rate) flow curves were demonstrated for samples of this experiment. Addition of filler was found to decrease die swell and retarded the occurence of extrudate distortion and shifted the onset of distortion to higher shear rates. The swelling ratio was increased as shear rate increased anp was decreased as the ratio of length to diameter of capillary increased. The swelling ratio was dependent on both viscoelastic properies of the suspension and the geometry of the extrusion system.

치과용 고무인상재의 영구변형 및 압축시 변형률

전창주,김준철,정석민,박영준 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.1

This study investigated the permanent deformation of dental rubber impression materials in order to evaluate their degree of recovery from displacement during removal through undercut area. We also investigated the stain in compression in order to evaluate the materials' flexibility during removal from the month, or during removal of the cast from the impression. Additional silicone, polyether, and polysulfied rubber impression materials were tested for their properties of permanent deformation and strain in compression according to the testing methods of the ADA specificaltion no. 19. 1.The permanent deformation values were as follows: polysulfide (2.25%), polyether (2.14%), and additional silicone (0.28∼1.21%, 2.38% for Perfect F). Examix, Express and Provil, which are additional silicone rubbers, showed lower permanent deformation values of 0.29%, 0.28% and 0.34%, respectively. Perfect F, although it is an additional silicone rubber, showed the highest permanent deformation value (2.38%) within the tested materials. 2.The strain in compression values were as follows: polysulfide (10.63%), additional silicone (2.88∼10.09%), and polyether (2.38%). The additional silicone rubber samples showed various values. Contrary to our expectations, it is also notable that Vinylate, which is used when taking an one-step impression, had higher stain in compression value (10.09%) than the light body impression materials even though it is classified as a heavy body material. Express (a.s.) had a low strain in compression (2.88%) which is similar to that (2.83%) of Impregum F (p.e.). In light body rubber materials, Permlastic had the highest value (p.s. 10.63%), followed by Perfect F (a.s. 7.38%), Correct VPS (a.s. 7.13%), Examix (a.s. 6.04%), Provil (a.s. 3.82%) and Express (a.s. 2.88%). Although the tested materials showed various values, all of them satisfied the requirements of A.D.A. Specification No. 19, which require that permanent deformation be less than 2.5%, and strain in compression be between 2∼20%.

韓紙製造工程의 自動化를 爲한 方案硏究(Ⅰ) : 蒸解 및 漂白工程을 中心으로 For the Digestion and Bleaching Processes

金春泳 全北大學校 1976 論文集 Vol.18 No.-

Korean paper has been manufactured from such bast fibre as pulp from a paper mulberry etc. with mucilage solution of abelmoschus manihot medic root by hand-made methods. It's, however, the fact that the manufacturing method of Korean paper is still backward in the light of its long history. It's necessary for us, the Koreans, to abvance the traditional methods of hand-made Korean paper, to develop manufacturing techniques of machine-made Korean paper, and to automatize its process as much as possible. In this research the method of automatization was dealt chiefly with the instrumentation system in the main manufacturing process of machine-made Korean paper and also every effort was made for its merits to be considered enough in each process. Consequently, it is thought that by applying this method of instrumentation to the machine-made Korean-paper manufacturing, management rationalization can be achieved without losing the characteristic of Korean-paper.

미생물을 이용한 Gellan Gum 생성의 Kinetic에 관한 연구

金春永,鄭奉佑,張光燁,李銀美 全北大學校 1992 論文集 Vol.34 No.-

Polysaccharides produced microbially, have shown themselves to be commercially significant. The reasons for the commercial exploitation of these microbial polysaccharides is because of their unique physical and consistant chemical properties and regularity of supply. Gellan gum is a recently discovered extracellular polysaccaride. This is an anionic heteropolysaccharide that forms viscous solutions and can under certain conditions, form thermoreversible gels with characteristics similar to those formed by both carrigeenan and agar. The aspect of Gellan gum produced by Pseudomonas elodea were investigated under various concentration of carbon sources and nitrogen sources. Sucrose and glucose are used as carbon source, and Bacto-peptone, Promosoy and (NH_4)_2SO_4 are used as nitrogen source. The maximum Gellan gum production was obtained in the culture medium 30.0g/L glucose, 0.6g/L Promosoy at pH 6.6, 37℃. The molecular weight of Gellan gum was 5 × 10 exp (5) which was determined by gel permeation chromatography.

격막형 액막에 의한 코발트 이온 및 니켈이온의 분리

金春泳,鄭奉佑,李鉉哲 全北大學校 1993 論文集 Vol.35 No.-

The separation of the cobalt ion and nickel ion was carried out which was based on the principle of coupling facilitated transport. The principle of coupling facilitated transport was developed and validated by predicting the cobalt ion and nickel ion fluxes through membrane as a function of hydrogen ion concentration in the feed solution, carrier concentration in the membrane, and content of metals ion in the feed solution, flow rate of the feed solution and acid concentration in the stripping solution. Diffusion coefficients of Co-di(2-ethyl hexyl) phosphoric acid and Ni-di(2-ethyl hexyl) phosphoric acid through polytetrafluroethylene membrane were 1.2×10^7㏖/sec and 5.5×10^8㏖/sec, respectively.

Cyclosporine이 同種皮膚移植瓣의 生存에 미치는 影響에 關한 實驗的 硏究

金世泳,趙尙憲,丁銓殷 고려대학교 의과대학 1987 고려대 의대 잡지 Vol.24 No.3

With efficient but nontoxic immunosuppression, allogenic skin could be used clinically on early treatment of severe burns or transfer of composite tissue allograft. Unlike organ grafts, where cyclosporine is superior to previously used agents (namely, azathioprine, steroid, 6-mercaptopurine etc.) in clinical setting, the behavior of allogenic skin under prolonged cyclosporine therapy has rarely been studied. The aim of this study is to prolong significantly the survival of skin allografts in rat model using the lowest possible doses of cyclosporine. Author studied the immunosuppressive effects of short courses of the drug, the efficacy of various maintenance doses in producing long-term survival, and the posibility of reversing episodes of rejection phenomenon. The results were obtained as follows: 1. Mean survival times (MST) of skin graft in untreated recipients were similar in both strain combinations tested (MST ± SD=8 ±1 days in Sprague Dawley to Gunns rat and 7 ±1 days in Gunns to Sprague Dawley rat). The short daily courses of 7,14 and 21 days of cyclosporine therapy significantly prolonged the survival in all groups. 2. Striking prolongation of skin graft survival was produced using maintenance doses of 8 or 15 ㎎/㎏ given every fourth day following 14 days of daily doses; lower maintenance doses were ineffectual. 3. Even long-standing allografts could undergo complete rejection following cessation of the drug. Within 2 to 4 weeks after discontinuation of the drug, early signs of rejection were noted. For reversing such rejection episodes, resuming cyclosporine administration in regular doses of 15㎎/Kg/day for 7 days,followed by the same dose given every second day, then every third day, and finally maintenance schedule every fourth day was done. Such early rejection were stopped within a week and the graft was healed completly by the third week.

最大 運動負荷 後의 血淸 乳酸 脫水素酵素 活性 變化에 관한 硏究

김원천,윤영학 진주여자전문대학 1994 論文集 Vol.17 No.-

Lactate dehydrogenase activity and H/M ratio were measured in the serum of seven long distance runners, seven health male students. VO_(2)-max was determined for each subject by administering a treadmill exercise test with Bruce protocol. The LDH isoenzyme assay were determined by the Helena LDH isoenzyme electrophoresis procedure. Paired t-test was used to evaluate the difference of the pre and post exercise within group and between groups. The one way analysis of variance was used to determine significant difference between exercise intensity and mean score of variables in each group. The .05 level of significance was as critical level for the study. The conclusion are as follows. 1. The H/M ratio of 50%, 70% and 90% VO_(2).max exercise are irrelevant to the endurance index. 2. Serum LDH activity and H/M ratio at rest are relevant to the endurance index. 3/ Serum LDH activity was increased after 50%, 70%, and 90% VO_(2).max exercise in athletes and non-athletes. 4. At rest 50% VO_(2). max exercise, H types was increased according to that of LDH4, LDH5 at 70% or 90% VO_(2).max exercise in both group. 5. As the exercise intensity was lower, H/M ratio was high, but a exercise intensity was higher, H/M ratio was low. 6. Serum LDH activity and H/M ratio at rest are relevant to the endurance index.

닥나무껍질(楮皮) 蒸解反應의 動力學的 硏究

金春泳 全北大學校 1980 論文集 Vol.22 No.-

Korean-paper, Hanji, has been manufactured by cooking bark of paper mulberry. The main purpose of cooking is to remove lignin from raw materials. The behavior of delignification, especially for the bark of paper mulberry, does not seem to have been investigated kinetically. This work aims to provide some information about the kinetics of delignification rate during alkaline cooking under atmospheric pressure. Experimentally, cookings were carried out on fine powder so that liquor penetration and diffusion would not be rate-controlling steps. Sample powder used in this study was extracted with alcohol-benzene(1:1). A high liquor-to-sample ratio was used to ensure constant liquor composition condition during each cooking. The results are summarized as follows; 1. Alkaline delignification rate of paper mulberry bark was shown to be proportional to the product of the amount of unremoved lignin and the concentration of sodium hydroxide in the liquor. -(dL/dt)=k〔OH^-〕L 2. The rate constant was found to be temperature-dependent, in accord with the Arrhenius equation, k=A exp(-E/RT) 3. The value of activation energy, E, was equal to approximately 32,000cal/g-mole and there is no variation of E with temperature.

Variability of typhoon Saomai and gravity waves activities

Kim,SeungHee,Hye-Yeong Chun 한국기상학회 2011 한국기상학회 학술대회 논문집 Vol.2011 No.10-1