• 대한기계학회논문집A
• /
• 제31권5호
• /
• pp.578-585
• /
• 2007

A vacuum circuit breaker (VCB) with permanent magnet actuator (PMA) has been studied in this study. Electromagnetic field analysis and dynamic simulations have been carried out for optimal design of VCB by using commercial software Maxwell and ADAMS. This simulation model can be an effective method for the VCB, which has non-linear output force of PMA, friction, and impact for operations. An experiment has been conducted to evaluate correctness of the simulated model. By using this evaluated model, the displacement and velocity characteristics of the VCB have been simulated with following conditions : (1) The different output forces of PMA have been applied, (2) The friction conditions in follow lever shaft and moving part have been changed, (3) The mass conditions of moving part have been changed. The simulated results shows that the velocity characteristics are mainly determined by the output force of PMA. The effects due to the changes of friction conditions against the dynamic characteristics was small, and the mass conditions of the moving parts affect the velocity and a bouncing phenomenon of VCB. From these results, the optimal design conditions for the VCB have been derived.

• 보건교육건강증진학회지
• /
• 제24권2호
• /
• pp.63-75
• /
• 2007

Purpose: The research was performed to provide basic information and bring importance to people's attention based upon seizing relation between employees's life patterns and health conditions in their daily lives. Method: This study was done from October 9th, 2006 to 27th and targeted on people who work more than 1 year in Seoul and Kyung-gi area including 700 people; 350 of males, 350 of females. In the experiment, there are 8 measurable variables which are weight, smoking, drinking, exercise, sleeping, having breakfast, regular time for meal and having snack. The survey questionnaire used THI. The collected data was analyzed using t-test, one way ANOVA, Pearson correlation coefficient and Multiple regression with SPSS/PC. Results: 1) It showed different data based on general traits such as gender, age, marriage, job and working time. 2) It also displayed different data in physical, mental and total health conditions depending on general traits. 3) The rate of symptom appeal was noticeably low as the body condition is in a good shape. 4) It exhibited that the variables for the rate of symptom appeal was negatively related to both male and female. 5) The variables affected to health conditions were age, exercise, having snack, sleeping, time for meal and smoking for male and weight, sleeping and time for meal for female. Conclusion: It is shown that if a person has a good life patterns in his/her daily life, he/she has a low rate of symptom appeal, which means he/she has better both physical and mental conditions.

• Transactions on Electrical and Electronic Materials
• /
• 제5권1호
• /
• pp.11-14
• /
• 2004

An rf triode magnetron sputtering system is designed and installed its construction in vacuum chamber. In order to calibrate the rf triode magnetron sputtering for thin films deposition processes, the effects of different glow discharge conditions were investigated in terms of the deposition rate measurements. The basic parameters for calibrating experiment in this sputtering system are rf power input, gas pressure, plasma current, and target-to-substrate distance. Because a knowledge of the deposition rate is necessary to control film thickness and to evaluate optimal conditions which are an important consideration in preparing better thin films, the deposition rates of copper as a testing material under the various sputtering conditions are investigated. Furthermore, a triode sputtering system designed in our team is simulated by the SIMION program. As a result, it is sure that the simulation of electron trajectories in the sputtering system is confined directly above the target surface by the force of E${\times}$B field. Finally, some teats with the above 4 different sputtering conditions demonstrate that the deposition rate of rf triode magnetron sputtering is relatively higher than that of the conventional sputtering system. This means that the higher deposition rate is probably caused by a high ion density in the triode and magnetron system. The erosion area of target surface bombarded by Ar ion is sputtered widely on the whole target except on both magnet sides. Therefore, the designed rf triode magnetron sputtering is a powerful deposition system.

• 한국초지조사료학회지
• /
• 제42권4호
• /
• pp.258-263
• /
• 2022

본 시험은 우리나라에서 원적외선을 이용한 이탈리안 라이그라스 인공건초 조제 가능성을 확인하기 위해 수행되었다. 본 시험에 사용된 기계는 온도, 송풍량, 원적외선 방사량을 조절할 수 있는 원적외선 건조기로 5월에 수확한 이탈리안 라이그라스를 대상으로 실시하였다. 건조를 위한 조건은 전체 9개의 조건을 선택하여 수행하였으며 각각의 조건은 방사율 42~45 %로 설정을 하였으며 내부 온도는 65℃로 설정하였다. 기기내의 기류의 속도는 40~60m/s로 하였으며, 전체적인 건조시간은 방사량 42%는 30분, 43%는 25분 그리고 45%는 20분으로 하여 수행하였다. 각각의 건조조건에 따른 최종 건물함량은 평균 88.5%로 나타났으며 전처리에서 건초에 적합한 건물함량을 나타내었다. 건조 조건에 따른 전력 소비량을 보면 45% 방사량에서 20분간을 건조한 처리구에서 가장 낮게 나타났다. 건조율에 있어서는 1~5번 건조 조건에서는 차이가 없었으나 6~7조건에서는 유의적으로 낮은 경향을 보였다. 사료가치에 있어서는 대부분의 건조조건에서 원물보다 CP, IVDMD는 높았고 ADF, NDF 함량은 낮게 나타났으며 대체적으로 4, 7 및 8번 건조 조건에서 높은 경향을 보였다. 이상의 결과를 통하여 건조속도, 전력량, 품질 등을 고려할 때 7 및 8번 건조조건이 가장 유리한 것으로 판단되었다.

• 방재기술
• /
• 통권18호
• /
• pp.5-16
• /
• 1995

The capacity commonly required sensors includes capability of quickly and properly catching the conditions of a fire and discriminating other factors such as noise, interference, etc. IR flame detector which react to the infra-red rays emitted from the flame. This study is aimed to know the characteristic repond to the specified fire plate. Experiment is acted by manufacture's technical data that is explained relation of detective range and sensitivity.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2000년도 춘계 학술대회지
• /
• pp.258-259
• /
• 2000

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2006년도 동계학술발표대회 논문집
• /
• pp.28-28
• /
• 2006

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2009년도 춘계학술대회 논문집
• /
• pp.857-858
• /
• 2009

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2007년도 춘계학술대회 논문집
• /
• pp.647-648
• /
• 2007

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2007년도 하계학술발표대회 논문집
• /
• pp.59-59
• /
• 2007