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정동철(Dong Cheol Jeong) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This thesis is about a performance evaluation of counterflow heat exchanger system. The heat exchanger that was used for this research is the first coolant heat exchanger which is the most popular one in the nuclear power plant. I designed the performance evaluation system for the heat exchangers. The validity of the system was checked to meet the requirement of the designing standard. Also, an arrangement plan was brought out for the optimal evaluation process via the performance evaluation of the heat exchanger which was currently in use and additional research was performed to provide the data for the life evaluation. For the practicality and economical efficiency for the evaluation, a Delphi computing program was used to build the performance evaluation system. As the result of the testing for the confidence level the Heat Transfer Ratio and Heat Transfer Factor turned out to be 17.58 ㎉/hr and 1195.7 ㎉/hr.㎡℃, respectively. Since the values were satisfactory for the designing standard the checking on the confidence level was successful. After the evaluation for appropriateness of the evaluation based on the satisfactory level of the standard was performed, 90% or more of the compliance level of the designing standard considering maximum heat load. In the blocks-in-the-tube test that was performed with 100 tubes the condition of the system was proved the validity of the performance evaluation. The performance evaluation of the current heat exchanger shows the result of 60 and 67 blocks in the tubes. According to the values the heat exchanger needed to be replaced. However, a retest was suggested because of the inaccuracy of the evaluation variables.
AC PDP에서의 대폭소거방식을 이용한 선택적 초기화 파형
鄭東哲(Dong Cheol Jeong),黃琪雄(Ki-Woong Whang) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
In this paper, we propose a newly developed selective reset waveform of a ac PDP using the wide erase pulse technique with the control of address bias voltage. Although it is generally understood that the wide pulse erasing methode shows the narrow driving margin in an opposite discharge type ac PDP, we could obtain a moderate driving margin in a 3-electrode surface discharge type ac PDP. The obtained driving margin shows a strong dependency on the sustain voltage and the address bias voltage. The lower the sustain and the address bias voltage, the wider the driving margin. The pulse width of the proposed waveform is only 10㎲, which gives additional time to the sustain period, hence increases the brightness. The brightness and contrast ratio increase about 20% together comparing to the conventional ramp type selective reset waveform with the driving scheme of 10 subfield ADS method. The driving margin was measured with the line by line addressed pattern on the white test panel of 2inch diagonal size and the discharge gas was Ne+Xe4%, 400torr.
어린이 중학생을 위한 성교육 지침서-가르쳐 주세요 제2회
정동철,Jeong, Dong-Cheol 한국건강관리협회 1983 건강소식 Vol.7 No.5
지난호부터 연재되는 ‘가르쳐 주세요’는 정신과의사인 정동철박사가 집필해 주시기로 하였습니다. 정박사는 어린 아들 · 딸들에게 말하기 어려운 여러 가지 성문제에 대해서 부모님들이 어떻게 교육을 시켜하나? 를 알기 쉽게 풀이해 드리기로 하였습니다.
어린이 중학생을 위한 성교육 지침서-가르쳐 주세요 제5회
정동철,Jeong, Dong-Cheol 한국건강관리협회 1983 건강소식 Vol.7 No.9
‘가르쳐 주세요’는 정신과 의사인 정동철 박사가 계속 집필해 주시고 계십시다. 정박사는 어린 아들 · 딸들에게 말하기 어려운 여러 가지 성문제에 대해서 부모님들이 어떻게 교육을 시켜야 하나? 를 알기 쉽게 풀이해 드리고 있습니다.