2차원 액체 ⁴He 내의 ³He 희석액에서 ³He 원자들의 유효상호작용

채건식,설정식,전철원 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-

2차원 액체 ⁴He내에서 ³He 원자들 d사이의 유효상호작용이 고찰된다. 평균유효퍼텐셜과 화학퍼텐셜의 비는 ³He 농도에 독립으로 나타난다. 또한 ³He 준입자의 유효질량이 1+1/2F₁^(s)로 주어지고 매개변수 F₁^(s)가 ³He 농도의 함수로서 얻어진다. The effective interaction between ^{3}He atoms in two-dimensional liquid ^{4}He is investigated. It is shown that the ratio of the average effective potential to the chemical potential is independent of the 3He concentration. Also, the effective mass of the ^{3}He quasiparticle is given by 1+1/2F_{1}^{s} and the parameter F_{1}^{s} is obtained as a function of the ^{3}He concentration.

국내산고령토정제에 관한 연구

신건철,이재장,전호석,조성백 江原大學校 産業技術硏究所 1990 産業技術硏究 Vol.10 No.-

The samples used for this work were low grade clay(Fe?O? : 2.90%, TiO? :1.65%) produced from Youngsan-do district, and for the iron-bearing impurities removal having a bad influence on Kaoline sample was carried out column floatation using Oleic acid, Potassium oleat, Aero 840 promotor, Aero 870 promotor and Keroseneas collectors. For removal of the iron-vearing impurities from the kaoline, investigated first chemical composition size distribution of Kaoline sample, also performanced a basic study on pulp density, collector and pH change on a sort frother. The flotation separation of impurities from kaoline can be achieved by using both oleic acid and Aero 840 promotor as collectors within narrow aoid limits(pH 2-3). Pine oil was more effective frother than MIBC with olelic acid as aa collector.

유리전박피판술의 응용과 유리전박이중피판술의 고안

윤근철 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2

Since the opening era of reconstructive microsugery, many free flap donor sites have been investigated and used clinically. Up to date over-sixty free flaps have been registered in our surgical memorandum. Among them several free flaps deserve to be admired for their superior clinical adoptability to the other free flaps. The forearm free flap, which is also called "Chinese free flap" because it was introduced to us by Chinese plastic surgeons, is used and admired world-widely recently for it's convenience of performance and acceptable clinical results. Author performed the forearm free flap in reconstructing one case of compound facial defect and three cases of pharyngoesophagus ablation. Notably the auther duplicated the flap for inner lining of nose and release of stenotic permenant tracheal opening. Four cases of forearm free flap and method of duplicating flap are reviewed and discussed with literatures.

正方形 DUCT內 亂流流動의 熱傳達에 관한 硏究

朴春根,全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1983 硏究報告 Vol.7 No.2

A numeical and experimental study has been performed on heat transfer in square duct. The effects of distant P between dry solides and Reynolds number were studied numerically by Finite Element Method(F.E.M.) The experiment were studied according to F.E.M. analysis by Universal Digital Measuring system. The results of F.E.M. analysis and experimental are as follows. 1) Comparison between mumerical and experimental results showed good agreement. 2) Heat transfer increases according to decrease of the P/D ratio and increase of H/L ratio too.

회전 초유체 ⁴He내에서 양자소용돌이의 평형

채건식,전철원,설정식 경남대학교 신소재연구소 1997 論文集 Vol.9 No.-

회전 초유체 ⁴Heso에서 중심에서 벗어난 양자소용돌이의 유체역학적 움직임이 소멸계수들과 열역학을 포함하는 초유체 유체역학 방정식을 사용하므로서 고찰된다. 평형상태로의 완화를 나타내는 시간상수에 대한 3-포논과정의 기여가 온도의 함수로서 계산되며 T의존을 가지는 것으로 나타난다. The hydrodynamic behavior of an off-center quantized vortex in rotating superfluid ^{4}He is investigated by using the superfluid hydrodynamic equation including dissipation coefficients and the thermodynamics. The contribution of three-phonon processes to the time constant that governs the relaxation to the equilibrium state is evaluated as a function of temperature, and is shown to have a T dependence.

國産粘土의 産地別 活用 方案 模索을 위한 基礎特性硏究

申建澈,金永道 江原大學校 産業技術硏究所 1986 産業技術硏究 Vol.6 No.-

A rapid and simple test to distinguish halloysite from kaolinite in mineral mixtures has been developed based on differences in the rate and extent of formamide intercalation. The results of quantitative analysis by formamide intercalation reaction GEC contained 90% of kaolin minerals, GEC contained of 86% of halloysite and GYK contained of 59% kaolinite. The extent of formamide intercalation by kaolinite was likely influenced by sample crystallinity.

분사법에 의한 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 탄산가스화법에 의한 탄산칼슘 입자 제조 공정에 있어서, 탄산가스로 채워진 반응기에 수산화칼슘 슬러리를 분사하는 방법으로 탄산칼슘 입자를 제조하였다. 수산화 칼슘의 농도(0.25~1.0wt%), 분사압력(0.5kgf /㎠~1.5kgf /㎠) 및 반응기 온도(20℃, 28℃)의 변화에 따른 생성된 탄산칼슘을 관찰하였다. 수산화 칼슘의 농도가 비교적 높으면(0.75wt%, 1.0wt%), 생성물의 pH와 전도도는 높게 나타났다. 분사압력에 의한 탄산칼슘 제조의 변화는 분사압력이 높아질수록(1.5kgf /㎠), pH와 전도도는 높게 측정되었다. 그러나, 수산화 칼슘의 농도와 분사압력의 변화가 탄산칼슘의 입자크기, 형태, 결정구조에 영향을 미치지는 않았다. 반응기의 온도가 28℃에서 생성된 탄산칼슘은 1.0㎛이하의 칼사이트 상 입자가 제조되었으며, 20℃에서 생성된 탄산칼슘은 0.5㎛이하의 칼사이트 상 입자가 제조되었다. 반응기의 온도가 낮아질수록 탄산칼슘 입자의 크기가 작아짐을 알 수 있었다. For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by spouting the aqueous slurry of Ca(OH)2 into reactor filled with CO2 gas. The concentration of Ca(OH)2 varies from 0.25wt% to 1.0wt%, nozzle pressure from 0.5kgf /㎠ to 1.5kgf /㎠, and reactor temperature were set at 20℃ and 28℃. With relatively high concentration of 0.75wt% and 1.0wt% of Ca(OH)2, pH and conductivity of product-stream were observed high value. High pH and conductivity were observed at high nozzle pressure of 1.5kgf /㎠. The concentration of Ca(OH)2 and nozzle pressure, however, did not change the particle size and shape of calcium carbonate synthesized by carbonation reaction. The reaction temperature affected particle size. At reactor temperatures of 28℃ and 20℃, the particle sizes were about 1.0㎛ and 0.5㎛, respectively. Crystal structure of calcium calcium carbonate was of calcite. When reactor temperature was lower, the size of calcium carbonate particle was smaller.

刑狀記憶合金의 擬彈性 機構에 關한 硏究

張忠根,崔哲圭,琴彩 충남대학교 기초과학연구소 1982 연구논문집 Vol.3 No.-

The pseudo-elasticity in the ternary alloy (Cu_74 Zn_20)Al_6 is investigated experimentally and the results are interpreted in terms of the continual mechanical twinning. Measured are the effects of temperature on such as stress-strain curve, critical shearing stress, twinning stress and load concentration. Also the relation between shearing stress and strain rate, and cyclic strain-stress curve are obtained experimentally. The experimental results of the present study are in good agreement with the Bolling-Richman theory which is a model-independent description of mechanical twinning. The transformation temperature of (Cu_74 Zn_20)Al_6 alloy are M_f : 333°K, Ms : 358°K, As : 353°K, and A_f : 393°K. The stress-strain curve shows clearly the pseudo-elasticity which is related with the mechanical twinning generated in the sample. The critical shear stress has the positive temperature-dependence indicating that the dominant process in the sample is a deformation by mechanical twinning rather than the deform by slip. Also, the temperature effects on work hardening, the relation between twinning stress and load concentration, and other measurements all indicate that the continual mechanical twinning is the main cause of the pseudo-elasticity in the Cu-based memory alloy (Cu_74, Zn_20)Al_6.

陸上競技選手와 他運動選手의 反應時間에 對한 比較實驗 硏究

金健洙,玉明哲 명지대학교 1982 明大論文集 Vol.13 No.-

This is a comparative research of the reaction between field and track events' players and other players, and it was tried out for an analysis of what kinf of results took place. Especially, in this research, 100V-bulb, 100W, 60W, 30W, 10W were used as buzzer and light, and measured simple Reaction time, whole body Reaction time, field and track crouching-start Reaction time in five groups separately. Persons in custody were mainly students of Myung Ji University and player's group, field and track events' players were Han Kook National College of physical Education. Results were analyzed by Random-sampling in all 70: field and track events' players, 10; general students, 17; Physical Education department's students, 21; football team, 12; basketball team, 10. As mentioned above results, conclusions are as follows: 1) The mean value of the reaction time to buzzer and light stimulus of each test group came to results as follows. A. In the Case of simple reaction, when buzzer stimulated, basketball team students were fastest; 0.150sec(high), 0.161sec (low), the second, field and track team students; 0.152sec(high), 0.180sec (low), football team students; 0.167sec (high), 0.184sec (low), P.E. department's students; 0.250sec (high), 0.226sec (low), the lowest-general students; 0.420sec (high), 0.284sec (low). As these results are measurement chronometry of using shoulder articulation mainly, I think that basketball team students who use hands frequently are in the leading position resolutely. B. In the case of whole body working time, small differences are shown and the fastest reactions are shown in field and track team; 0.230sec (high), 0.233sec (low). The second, football team; 0.233sec (high), 0.235 (low), P.E. department students; 0.257sec (high), 0.183sec (low), (In bass P.E. department students were the fastest in reaction time). Basketball team; 0.268sec (high), 0.264sec (low), general students; 0.322sec (high), 0.336sec (low). C. Reaction time of crouching-start as group-to-group comparison was fast also in the group of useing feet frequently. field and track team was the fastest; 0.161sec (high), 0.123sec (low), the second, football team; 0.175sec (high), 0.173sec (low), basketball team; 0.181sec (high), 0.176sec (low), P.E. department students; 0.243sec (high), 0.266sec (low), general students; 0.261sec (high), 0.262sec (low). 2) Reaction time of luminous intensity in each team was results that buzzer was more stimulant to reaction than light. 3) Reaction time of luminous intensity of each testing group was shown according with intension of stimulus to bright light, and the reverse phenomenons came out. 4) Reaction of the tone of buzzer to the buzzer in each group was shown that reaction time to a loud buzzer was fast in superior groups, and in other groups, in a bass.

洪川産 Silica의 特性硏究

申建澈 강원대학교 산업기술연구소 1984 産業技術硏究 Vol.4 No.-

Silicastone of Hongcheon in Kangweon province was characterized by means of chemical analysis, scanning electron microscope, polarization microscope and x-ray diffractometer. The results showed that the purity of SiO₂ is over 97.64 in Wt-%. It also contains 0.046ㅡ0.417 wT-% Fe₂O₃ and some others as impurity. The impuity exist as a isolated mineral type of hematite, sericite, apatite etc.