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      • 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.

      • SCOPUSSCIEKCI등재
      • SCOPUSSCIEKCI등재
      • 化學的處理方式에 의한 公害防止 硏究

        李龍根,黃圭子 연세대학교 자연과학연구소 1979 學術論文集 Vol.4 No.-

        킬레이트試藥을 吸着시킨 巨大網狀高分子를 써서 컬럼操作에 의하여 化學的 處理方式으로 6價크롬이온의 抽出分離 除去를 市道하였다. 試飮料의 液性과 流速을 조절하고 共存이온의 影響을 조사하여 6價크롬이온의 最適 抽出條件을 檢討한 결과 實驗室規模의 6價크롬이온의 除去法으로는 有用한 것을 알았다. 또한 一般 工場廢水處理에 應用할 경우 겔 粒子속의 킬레이트試藥이 처리속에서 洩出되므로 그 對策을 硏究할 必要가 있다. 겔 粒子는 에탄올(h는 메탄올이나 아세톤)로 쉽게 效果的으로 再生되므로 켈컬럼은 反復 使用할 수 있었다. It was attempted in this study to eliminate Cr(VI) by chemical treatment operating column using chelating reagent impregnated macroreticular gel beads. It was observed the effects of foreign ions in the sample and was tried to isolate Cr(VI) by controlling pH and flow rate of the sample solution to find out the best condition of its controlling pH and flow rate of sample solution to find out the best condition of its extraction. We have succeded to find out a useful practical isolation method of Cr(VI) at laboratory level but it is necessary to modify the method when it is applied for industrial level because chelating reagent impregnated gel beads use to leak out, for which a further work has to be done. It was found that the used beads could be regenerated effectively by treating with either ethanol or methanol or acetone, therefore the gel column could be used repeatedly.

      • KCI등재

        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.

      • KCI등재

        사용자 중심의 기업정보시스템 운영성과 관리체계에 관한 사례연구

        이용근,황경태 한국정보기술응용학회 2015 Journal of information technology applications & m Vol.22 No.1

        This study aims to provide the results of a case study, based on the action research approach, in which an user-oriented management system for enterprise information systems operational performance is successful developed and applied. This study performs the research and summarizes the results by adopting 5-step approach of action research, i.e., diagnosing, action planning, action taking, evaluating and specifying learning. The most important lessons learned from the study include (1) operation performance measures should be established to be shared by the management and users; (2) evaluation and improvement activities should be performed continually; and (3) formula to calculate the measure should be evolved so that improvement initiatives can be identified. The results of the study are expected to provide the companies intending to develop a management system for enterprise information systems operational performance with the practical and useful information. In addition, it is expected to suggest the research results that can be utilized as a basis for future research in this area.

      • KCI등재

        사용자 중심의 기업정보시스템 운영성과 관리체계에 관한 사례연구

        이용근,황경태 한국데이터전략학회 2015 Journal of information technology applications & m Vol.22 No.1

        This study aims to provide the results of a case study, based on the action research approach, in which an user-oriented management system for enterprise information systems operational performance is successful developed and applied. This study performs the research and summarizes the results by adopting 5-step approach of action research, i.e., diagnosing, action planning, action taking, evaluating and specifying learning. The most important lessons learned from the study include (1) operation performance measures should be established to be shared by the management and users; (2) evaluation and improvement activities should be performed continually; and (3) formula to calculate the measure should be evolved so that improvement initiatives can be identified. The results of the study are expected to provide the companies intending to develop a management system for enterprise information systems operational performance with the practical and useful information. In addition, it is expected to suggest the research results that can be utilized as a basis for future research in this area.

      • KCI등재

        Translucency changes of direct esthetic restorative materials after curing, aging and treatment

        이용근 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.4

        The purpose of this article was to review the changes in translucency of direct esthetic restorative materials after curing, aging and treatment. As a criterion for the evaluation of clinical translucency changes, visual perceptibility threshold in translucency parameter difference (ΔTP) of 2 was used. Translucency changes after curing were perceivable depending on experimental methods and products (largest ΔTP in resin composites = 15.9). Translucency changes after aging were reported as either relatively stable or showed perceivable changes by aging protocols (largest ΔTP in resin composites = -3.8). Translucency changes after curing, aging and treatment were perceivable in several products and experimental methods. Therefore, shade matching of direct esthetic materials should be performed considering these instabilities of translucency in direct esthetic materials.

      • KCI등재후보

        바퀴구동 이동로봇의 경로추적 직접적응제어

        이용근 대한전기학회 2004 전기학회논문지 P Vol.53 No.4

        In this paper, a direct adaptive tracking controller based Lyapunov method is designed for a wheeled mobile robots. A wheeled mobile robots have three degrees of freedom and two control variables. Therefore, it is difficult to control a mobile robot using the general linear control. We introduce two kinds of Lyapunov function for the design of the controller and verify the controller. A mobile robots using the designed adaptive direct tracking controller is well-behaved and is easily implemented.

      • KCI등재

        秦蒼朮湯과 加味方의 鎭痛.解熱.抗炎症 作用 및 腸管輸送能에 關한 實驗的 硏究

        이용근,채병윤,Lee,,Yong-Geun,Chae,,Byeong-Yun 대한한방안이비인후피부과학회 1989 한방안이비인후피부과학회지 Vol.2 No.1

        The studies were attempted experimental effects of Jingyochangchooltang (Sample A), Jingyochangchooltang plus Sophorae Semen (Sample B) and Deungyangjingyochangchooltang (Sample C) on analgesia, antipyretic, antiinflammatory action and Tramsport of Intestinal contents in mice. The result of studies were as follows: 1. Analgesia action by Acetic acid method was showed significant effect at all sample groups. 2. Analgesia action by Acetylcholine-HCil method was showed significant effect in sample A group. 3. Analgesia action by Reandall-selitto method was showed significant effect at all sample groups especially sample B group was showed more significant effect from 2 hours to 3 shours. 4. Antipyretic action by yeast method was showed significant effect at all sample groups, especially sample A group and sample C group were showed more significant effect after 6 hours than sample B group. 5. Antiinflammatory action by carrageenine method was showed significant effect at all simple groups. 6. In the intestinal transport, in contrast to control group, sample A group revealed the increasing rate $38.7\%$ and sample B group revealed the increasing rate $47.7\%$. According to the above result, it can be concluded that Jingyochangchooltang, Jingyochangchooltang plus sophorae Semen and Deungyangjingyochangchooltang had a remarkable effect on the treatment of hemorrhoids caused by Pung Yul and inflammation of anus.

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