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酸性 및 監基性色素가 赤痢菌 Phage의 活性에 미치는 影響
趙哲濟 中央醫學社 1965 中央醫學 Vol.8 No.5
The papers reported about the action of dye to bacteriophage are rather few even though the data on bacteria have fairly been found. The author has studied the effect of dye on the dysentery phage and the following results are obtained. Many acid and basic dyes inactivated the activity of phage particle itself and the action of basic dyes, in general, seemed to be more strong than that of acid dyes. The phage inactivating activities of dyes were most strong at 37℃ and, at 20℃ and 4℃, their actions were very weak or negligible. And also, the phage inactivating activities of dyes were not influenced by pH. The phage adsorption to host cell was not influenced by dye (Crystal violet) and the appearance of phage adsorption occurred under the existence of dye was similar to that carried out in normal conditions. The phage particles already adsorbed to host cell were not inactivated by the action of dye and a antagonistic phenomenon between the phage inactivating activity of acid and basic dye was found. The mechanism of the action of dye was discussed.
三脚鐵心構造를 가진 周波數 3倍器의 開發에 關한 實驗的硏究
趙哲濟 釜山工業大學校 1986 論文集 Vol.28 No.1
A magnetic frequency tripler is a nonlinear device that is used to produc third-harmonic frequency output from a three-phase fundamental fre quency source. It gained wide industrial applications recently and its rating for induction heating and melting increased from 50 KW to 10MW range. This paper deals with the tripler employing three 3-legged transformers connected in delta. Because a triple frequency current circulates in delta connection and does not flow into the input line, the input current has very little distortion and the value of it changes very little with the fluctuations of the input volage and the load. Simultaneously, the consumption of iron and copper is about same as of the traditional star-connected circuit. The analysis in this paper is based on the model of an idean lossless tripler and the relations between the saturation characteristics and circuit constants are examined through the experiment.
洪淳一,趙哲濟 釜山工業大學校 1988 論文集 Vol.30 No.-
A motor is used widespreadly in robotics, industrial application and automatic control system. It is very important that the user knows dynamic motor characteristics. As the speed torque characteristic of motor is most important among these characteristics, its performance characteristic should be verified as accurately as possible. Though various test methods are generally adopted to measure a speed torque characteristics of a motor, confidential data could not be obtained by those methods in small motor test facility because there is physical contact between speed sensing and rotating shaft. Recentrly, many new developments have taken place throughout the industry with speed torque sensor and many IC's. The object of this paper is to develope a measuring instrument of a speed torque characteristic for the small motors, 1)with accuracy 2) wiht facility 3) with instancy and is to graph its speed torque characteristic with X-Y recorder. In this paper, the theoretical equations to measure a speed torque of a motor have been driven by using the rotating period of the motor. Based on these equations, the algorithms have been built so as to calculate its speed torque and the block diagram has been built so as to measure its speed torques. An instrument has been disigned so as to measure speed torque characheristic of a motor. There are no physical contacts between the speed sensing adn rotating shaft in that instrument. It has been established not only to facilitate the composition of circuits and speed sensing circutis but also to increase resolution for calculations of motor's speed torques. The work on dynamic testing was performed on the hystersis synchronous motor and the DC motor with the rate of values of a table 3, and the suitable clock pulse at the testing is 180kHz. It has been shown that performance testing of the motor's characteristics has been obtained cleary in Fig 4.5 and that the responses on the various control circuits and sensing dircuit have been obtained satisgactorily in Fig 4.2, Fig 4.3, and Fig 4.4. Simplicity and superiorty on measurement of a motor's speed torque is clearly brought out.