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小信號 Admittance를 이용한 MOS 구조에서의 少數-Carrier Lifetime 測定
李憲用,李泰雨 명지대학교 1987 明大論文集 Vol.18 No.-
In this paper, a complete equivalent circuit of MOST-Capacitor is suggested, taking into account the effects of bulk-trap and in strong inversion, a simplified equivalent circuit of MOS-Capacitor is derived. The interpretation of the experimental results is carried out in terms of this simplified equivalent circuit. It is shown that the determination of minority-carrier lifetime can be made easily from simple measurement of small-signal admittance.
統計的 手法에 의한 polyethylene의 電壓-壽命特性 解析
李憲用,千康大 명지대학교 1986 明大論文集 Vol.17 No.-
This study is to investigate the V-t characteristics gained by statistical methods means of the Weibull distribution functions, when A.C. voltage is applied at polyethylene with and without void. The results showed that breakdown type remained constant between shape parameter and electrical field stress gained by Weibull distribution functions in case of without void, but it varied at some critical point in case of with void.
이헌용,박지훈,윤충식 한국산업보건학회 2017 한국산업보건학회지 Vol.27 No.4
Objectives: This study aimed to evaluate the relationship between filter replacement and filter performance change in particulate filters used in the workplace. Methods: Three types of particulate respirator filters are mainly used in the workplaces. These were tested against the filter performance safety certification standard for dust masks established by the Ministry of Employment and Labor(MoEL). Used filters were collected to test their performance, such as filter pressure drop, efficiency, and quality factors. All these factors were evaluated by a filter tester. To compare filter performance between used and new ones, the same kinds of new filters were also tested together under the same procedures. Results: A total of 270 used filters were collected for testing. The main reasons to replace the filters were difficulty in breathing(46.2%), dirty/odor influx(19.7%), and a combination of factors(26.7%). The pressure drop for two special class groups was significantly different(new filters: 20.72±3.33 mmH2O; used filters: 24.70±5.26 mmH2O, p<0.0001). In the case of penetration, new filter groups indicated 0.0032±0.0040%, while that of the used filters was 0.0596±0.1187%. The quality factor for the used filters(0.34±0.09) significantly decreased compared to the new filters(0.53±0.08) (p<0.0001). Conclusions: Filter performance including pressure drop, penetration, and the quality factor was evaluated and compared between new and used filters in the workplace. The results showed that general filter performance deteriorated more for change of pressure drop, penetration and the quality factor.