액체 An-In, Al-Sn, Al-Ga 계합금의 열역학적 성질

이용근 대한금속재료학회(대한금속학회) 1970 대한금속·재료학회지 Vol.8 No.2

金屬溶液의 熱力學的性質은 冶金理論의 基礎를 이루우고 있으므로, Al冶金의 基礎的硏究로서, 液體 Al溶液의 熱力學的 硏究를 한 結果中에서 Al-In, Al-Sn 및 Al-Ga系에 대한 特性을 論한다. 濃淡電地에 의한 그 起電力을 全組成範圍에 선하여 各各 700℃에서 94℃, 680℃에서 860℃ 및 680℃에서 820℃의 溫度範團에서 測定하고, 이것에 의거하여 Al, In, Sn 및 Ga의 各系에 있어서의 活量과 다른 熱力學的性質을 算出하여, 그 結果를 考察하였다. 이 中에서 Al-In系에는 二液相이 있어서 그 範圍을 起電力의 測定値에서 決定하였다. Al-In系의 成分의 活量은 Raoult의 法則에서 크게 正으로 偏倚하고, 溫度가 높을 수록 Raoult의 法則에 接近하여, 二液相內에서는 組成에 關係 없이 定溫度에서는 일정한 活量을 나타낸다. Al-Sn系에서는 Raoult의 法則에서 상당히 正으로 偏倚하며, Al-Ga系에서는 상당히 잘 따르고 있다. 그리하여 Al-In系는 比正則溶液, Al-Sn系는 sub-regular solution 및 Al-Ga系는 regular solution에 가까움을 알 수 있었다. 이 系들의 無限稀溥溶液에서의 活量係數는 γ˚은 Al-In系는 700℃에서 Al, In 各各 11.3, 13.2이며, Al-Sn系에서는 800℃에서 各各 4.05, 7, 11 및 Al-Ga系에서는 700℃에서 各各 1.15, 1.27을 얻었다. 한편 統計熱力學으로도 model 을 適用하여, 古典熱力學에 의한 結果와 比較考察하였다. 즉 Al-In系에 대해서는 model과 二液相境界線을 써서 活量을 算出하고, Al-Sn, Al-Ga의 兩系에 대해서는 各系의 熱力學的 過剩量을 算出하였다. 그리고 quasi-chemical의 近似式을 써서 3系에 있어서의 原子相互作用 energy와 short-range order parameter를 算出하고, 또 3系에 있어서의 各成分間의 self-interaction parameter도 算出해서, 이것들의 系의 巨視的性質과 微視的性質을 比較考察하여 서로 一致함을 알았다.

Reserpine 및 Alloxan으로 前處置한 家兎子官의 子官收縮藥에 對한 感受性 및 子官筋內 電解質의 變動

이용근,申萬鍊 우석대학교 의과대학 1970 우석의대잡지 Vol.7 No.1

An experimental study was carried out to investigate the effects of spareng and quinine on the uterine contractility of rabbits pretreated with reserpine and alloxan. Reserpine and alloxan were given 48 hours and 24 hours prior to excision of the uterus respectively, and then the contractile sensitivity of the uterine muscle to spareng and quinine, and the electrolyte changes have been observed. The following results were obtained; 1. When the rabbit uterus pretreated with reserpine, its contractile sensitivity to quinine is increased at level on quinine 10^(-5) g/ml. And when it is pretreaped with alloxan, its contractile sensitivity to both spareng and quinine are increased. When it is pretreated with reserpine followed by alloxan, its sensitivities to both spareng 10^(-4)g/ml and quinine 10^(-5)g/ml are increased. 2. The electrolyte changes in the rabbit uterine muscle pretreated with reserpine showed marked decrease in sodium level, increasing tendency in potassium and decrease in calcium, however no changes in magnesium level. 3. The contents of sodium, potassium, calcium and magnesium in the rabbit uterine muscle pretreated with alloxan showed increasing tendency. 4. The electrolyte changes in the rabbit uterine muscle pretreated with spareng showed marked decrease in sodium, calcium and magnesium, decreasing tendency in potassium level. Those pretreated with quinine showed marked decrease in sodium and magnesium, decreasing tendency in potassium, however no changes in calcium level.

중금속에 의한 환경오염의 간이분석법

李龍根,黃圭子 연세대학교 자연과학연구소 1978 學術論文集 Vol.2 No.-

1-(2-pyridylazo)-2-naphthol(PNA)을 포함한 겔 粒子를 체운 分析컬럼을 사용하여 카드뮴 (Ⅱ), 코발트 (Ⅱ), 구리 (Ⅱ), 납 (Ⅱ), 및 亞鉛 (Ⅱ)등의 重金屬이온들을 ppm이하의 濃度까지 測定하였다. 重金屬이온을 포함한 試料水를 分析컬럼에 흘리면 각 金屬 PAN 킬레이트(Metal panate)들의 생성으로 인하여 겔粒子는 노란 색으로부터 붉은 색 또는 청자색으로 변하며 變色帶의 길이는 컬럼에 흘린 용액속의 重金屬이온의 濃度에 따라 比例되었다. 0.01% PAN겔의 分析컬럼으로 試料水를 0.2ml/min의 流速으로 흘리므로서 0.2~4.0ppm의 重金屬이온(납으로 환산된 농도)을 簡便迅速하게 同時測定할 수 있고 分析컬럼속의 0.01% PAN겔粒子는 冷暗所에서 보관하면 적어도 12개월까지는 안전하며 metal panate는 3M鹽酸으로 逆推出되므로 樹脂粒子를 再生시킬 수 있었다. 이 分析法은 몇몇 實地 試料水에 應用하여 原子吸光分析法의 測定値와 비교하고 回收實驗한 결과 本法은 一般環境水에도 適用할 수 있었다. Heavy metals such as cadmium(Ⅱ), cobalt(Ⅱ), copper(Ⅱ), lead(Ⅱ), and zinc(Ⅱ) were determined at sub-ppm level by using an analytical column packed with gel beads containing 1-(2-pyridylazo)-2-naphthol(PAN). The beads turned from bright yellow to ping or violet when the sample solution containing the these heavy metals were passed through the analytical column at pH 10. The length of colored zone was proportional to the amount of heavy metals in sample solution. With 0.01% PAN gel, 0.2~4.0 ppm of heavy metals (as lead) could be determined in the sample solution at a flow rate of 0.2ml/min. Analytical column packed with 0.01% PAN gel beads could be stored freshly for at least twelve months in a refrigerator and metal panates absorbed on the analytical column could be back-extracted from the resin beads by passing 3M hydrochloric acid. The used resin beads could be re-used repeatedly. This method was applied for analyzing the heavy metals of practical samples such as sea water, river water, industrial effluent and tap water, and it was found that the results of the present method was in agreement with that of atomic absorption spectrophotometric technique. Therefore, the method could be used in the field for samples of environmental origin.

전자계약의 체결에 따른 법리적인 문제점에 관한 연구

이용근,박종석 中央大學校附設 國際貿易物流硏究所 2002 國際貿易物流硏究論叢 Vol.9 No.-

여행업문화가 조직유효성에 미치는 영향에 관한 연구

이선희,이용근 문화관광연구학회 1999 문화관광연구 Vol.1 No.1

ABSTRACTAn Influence of Travel Agency's Culture on Organizational Effectiveness Sun-Hee Lee·Yong-Keun Lee The Effects of corporate culture on the organizational effectiveness and/or corporate competitiveness have been widely recognized and discussed among both the incumbent managerial and the academicians of economics and sociology in recent years. The purpose of this study is to review the functions of the corporate culture and to examine the factors of the corporate culture among the travel agencies.The present study starts with a conceptual review of the corporate culture. The characteristics of corporate culture is shaped usually with the two major elements; the styles of management and decision-making of the top managerial and the subculture of the employees. Each of the four components of Corporate culture is operationalized as follows; ① tough-guy, macho culture, ② work hard, play hard culture, ③ bet-your-company culture, ④ process culture. These four components of corporate culture become the independent variables while the recognition of environment becomes the dependent variables in the analytical model proposed in this paper. The recognition of environment such as danger and feed-back speed is divided into pre-IMF and post-IMF.Some results of the findings are as follows: First, before IMF, as the danger is recognized low and feed-back speed fast, the corporate culture is shown as work hard, play hard culture. Second, after IMF, as the danger is recognized high and feed-back speed fast, the corporate culture is shown as tough-guy, macho culture.

첨가제에 따른 치과용 석고의 물성변화

김연웅,김경남,이용근 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.1

열변환 및 용액차이에 따른 치과용 콤포짓트레진의 미세경도 변화에 관한 연구

이용근 원광대학교 생체재료·매식연구소 1996 원광생체재료·매식 Vol.4 No.3

信用狀 詐欺에 대한 Fraud Rule 適用의 問題點과 對應方案에 관한 硏究

李鎔根,韓載泌 中央大學校 1996 國際貿易硏究論叢 Vol.3 No.-

熔融알루미늄 二元合金의 混合熱

李容根 全北大學校 1976 論文集 Vol.18 No.-

The heats of mixing in the binary liquid aluminum alloys, Al-In, Al-Ga and Al-Ge systems were determined using an adiabatic calorimeter directly, and those of Al-Sn, Al-Zn, Al-Te and Al-Au systems were also determined by the electromotive force method, dew point method and distribution method indirectly. The values obtained were treated with ξ function^2), and the properties of these solutions have been observed based on the ξ functhons. As a result, it seems that Al-Zn system is a regular solution, Al-Ga, a regular soluton obeying quasi-chemical approach and Al-Ge, a sub-regular solution. The relations of the ξ function to the periodic law and to the equilibrium diagram in each system were discussed, and the short-range order parameters have also been derived using the heats of mixing in the Al-In and Al-Ga systems.

液體 Al-Zn, Al-Te系의 熱力學的 性質

李容根 全北大學校 1971 論文集 Vol.13 No.-

The liquid aluminum-zinc and -tellurium systems have been investigated by the dew point method for clarifying their thermodynamic properties. In this work, the dew point method has been improved so as to find out the dew point thermoanalytically and record it automatically. Consequently, the measuring operation is simpler, and that, the result is more accurate than that of ordinary one. The measurements were carried out over entire composition range for both systems, and in the temperature range 650°to 800℃ for the Al-Zn system and 700°to 920℃ for the Al-Te system. The activities of the components Al, Zn and Te of both systems have been derived using the messured data, and also calculated from quasichemical approach, regular solution theory and the heat of fusion of Al_2 Te_3. The interaction energies and short-range order parameters for the Al-Zn system have been calculated from quasichemical approach and the results are reasonable to compare with the classical thermodynamic properties.