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Dichromate-Polyphosphate系 防蝕劑에 依한 腐蝕抑制 效果
鄭遇喆 전북대학교 공업기술연구소 1977 工學硏究 Vol.7 No.-
This study is the results from the experiment of the Corrosion prevention of iron metals under the Corrosive Circumstance by Using Inorganic Compounds mixed, such as Dichromate and Poly-phosphate(Hexameta phosphoric acid). Thus, author examined the effect of the Corrosion Prevention of iron metals in the neutral solution and tried to increase of inhibitors of Corrosion in the Circulation Cooling System by determining the proper amount of addition and the Selective Condition of the agents of Corrosion preventions. Main items of this experiment are shown as that ; 1. The effect of pitting corrosion prevention. 2. The influence of mixing rates of each inhibitors. 3. The influence of the metal ions in cooling water. 4. The influence of the concentration of inhibitors. 5. The influence of the speed of stream, pH, and temperature.
鄭遇喆 전북대학교 공업기술연구소 1979 工學硏究 Vol.9 No.-
This study is to debat the meaning, tendency of environmental engineering, to describe the necessity of its stystematization in introcution and to emphasize that the settlement way of human's environmental matters, especially the matters of forcing human's prosperity, is studied and inquired engineeringly but environmental engineering and prevention and eradication of pollution was treated in the same class before. In the first part the purpose of environmental enginering, "the system of field " as a study in environmental engineering, the position of environmental engineering and the systematization of environmental engineering was debated. In the secont part, - before establishing a model of environmental engineering curriculum -, comparing, investigating the curriculum running in our university, refering the curriculum of environmental engineering in Japan according to my study when I stay Japan National Public Health Institude, I established the new curriculum to teach in environmental engineering as new university level. In the third part an Effective running way was presented as a new indication and my opinion was synthesised as conclusion.
TMAH에 의한 이방성 식각을 이용한 3차원 자기센서의 제작
정우철,남태철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
This paper present an anisotropic etching in TMAH technique used in the fabrication of three-dimensional magnetic field vector sensor based on angled Hall plate structure. This sensor design relies on simultaneously detecting all magnetic field vector components using Hall plates that are imbedded into the silicon [111] sloped-surface of bulk micromachined cavity by the anisotropic etching of [100] silicon. The fabricated Hall elements has relatively improved sensitivity compare to convensional Hall elements for three-dimensional magnetic field sensing. The product sensitivity of 547V/AT at the supply current of 1.0mA has been achieved.
鄭遇喆 全北大學校 1966 論文集 Vol.7 No.-
In mordern pottery industry,forming of clay body mainly accomplished by casting slip (or suspension of clay) in plaster mold, has been used especially in high class pottery. This study, is dealt with the various factors that influence the viscosity of 10 kind of Korean clay slips for the casting. At first, Experiment was planned as follows; (1) Determination of change of viscosity by adding deflocculant and differential comentration ation of clay slip. (2) The influences on viscosity)by aging. (3) Relationship between slip temperature and slip vlscosity. (4) Relationship between slip treatment and viscosity. (5) Relationship between Compounding and viscosity. (6) Determination of viscosity change by changing PH-value in clay slip etc.