• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.95-98
• /
• 2006

This paper proposes high speed SRM drive system for blower with a new 4-level inverter and precise excitation position generator. For the high speed blower, a proper inverter and control method are proposed and the output characteristics are analyzed. In order to get a fast build-up and demagnetization of excitation a current, 4-level inverter system is proposed. The proposed 4-level inverter has additional charge capacitor, power switch and diode in the conventional asymmetric converter. The charged high voltage is supplied to the phase winding for fast current build-up, and demagnetization current is charged to additional capacitor of 4-level inverter. In addition, a precise excitation position generator can reduce turn-on and turn-off angle error according to sampling period of digital control system. The proposed high speed SRM drive system is verified by computer simulation and experimental result.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 추계학술대회논문집B
• /
• pp.112-117
• /
• 2001

An experiment using high preheated and swirled air in the coaxial diffusion flame burner was carried out in order to decrease NOx emission and improve the thermal efficiency. $N_2$ gas was used for diluent and propane was utilized for fuel. Combustion using high preheated air has two remarkable characteristics ; (1) low NOx emission with increasing dilution level, (2) high thermal efficiency in the furnace. Also, swirled air can mix fuel and oxidizer well in condition of diffusion flme and maintain the stable combustion. The color of flame changes from yellow to blue green according to increasing the dilution level of mixture gas. NO emission decreased with increasing dilution level and the swirl number.

• Nuclear Engineering and Technology
• /
• 제44권8호
• /
• pp.939-944
• /
• 2012

Deposition potential, deposition time, square wave frequency, rotation speed of the rotating disc electrode, and palladium concentration were studied on a Glassy Carbon Electrode (GCE) in 0.01M HCl for the determination of palladium in High Level Nuclear Waste (HLNW) by anodic stripping voltammetry. Experimental conditions were optimized for the determination of palladium at two different, $10^{-8}$ and $10^{-7}M$, levels. Error and standard deviation of this method were under 1% for all palladium standard solutions. The developed technique was successfully applied as a subsidiary method for the determination of palladium in simulated high level nuclear waste with very good precision and high accuracy (under 1 % error and standard deviation).

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.110-113
• /
• 2005

This paper proposes high speed SRM drive system for blower with a new 4-level inverter and precise excitation position generator. For the high speed blower, a proper 12/8 SRM is designed and analyzed. In order to get a fast build-up and demagnetization of excitation a current, now 4-level inverter system is proposed. The proposed 4-level inverter has additional charge capacitor, power switch and diode in the conventional asymmetric converter. The charged high voltage is supplied to the phase winding for fast current build-up, and demagnetization current is charged to additional capacitor of 4-level inverter. In addition, a precise excitation position generator can reduce turn-on and turn-off angle error according to sampling period of digital control system. The proposed high speed SRM drive system is verified by computer simulation.

• Human Ecology Research
• /
• 제53권5호
• /
• pp.581-594
• /
• 2015

This paper analyzes the effects of adolescents' cultural disposition and self-conscious emotion on empathy according to gender and age. Data were collected from self-report questionnaires for 385 adolescents in Chungbuk province. The major results of the study were as follow: First, adolescents who perceived high collectivism showed a high ability on perspective taking. Additionally, girls who had high guilt showed a high ability on perspective taking. Sixth graders who had high guilt and low shame and eleventh graders who had high pride showed high ability on perspective taking. Second, boys who perceived high collectivism and guilt, and girls with high individualism, low shame, and high guilt showed a high ability towards fantasy. Sixth graders who had high individualism and guilt and low shame, eighth graders with high guilt and eleventh graders with high individualism, collectivism and guilt showed high ability towards fantasy. Third, adolescents with high collectivism showed high ability on empathic concern. Additionally, boys, girls, and eleventh graders with low shame and high guilt, and sixth graders with low shame showed a high level of empathic concern. Fourth, all adolescents with high guilt showed a high level of personal distress. Additionally, eighth graders with low individualism and eleventh graders with low pride showed a high level of personal distress. In conclusion, the significant relationships among cultural disposition, self-conscious emotion, and empathy are different for gender and age groups. Implications for future studies are provided.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2001년도 춘계학술대회 논문집
• /
• pp.1033-1036
• /
• 2001

The object of this paper is to find out a coolant level, which is economic and similar to the conventional level, high level, in cutting temperature. For this, new coolant level, called a low level, was proposed, which is about 1/4 of conventional level. And the cutting temperature of each coolant level in turning was analyzed using statistical method. Firstly, it was analyzed that the temperature mean of each coolant level is not equal by ANOVA-test. Secondly by Tukey's HSD, one of multiple comparisons, it was analyzed that the temperature mean of low level is similar to that of high level and different from that of none level.

• 한국가정과교육학회지
• /
• 제30권2호
• /
• pp.57-75
• /
• 2018

본 연구는 부모학대와 방임이 남녀 고등학생의 자아탄력성과 자아존중감에 미치는 영향과 이 과정에서 또래애착과 교사친밀감의 조절효과를 알아보는 것을 목적으로 하였다. 이를 위해, 한국 아동·청소년패널조사의 초등학교 4학년 패널(2~7차년도) 1,750명의 자료를 사용하여 위계적 회귀분석을 실시하였으며, 다음과 같은 주요결과를 도출하였다. 첫째, 남자 고등학생의 경우 부모로부터 학대수준이 높을수록, 또래애착과 교사친밀감 수준이 높을수록 자아탄력성 수준이 높았으며, 부모방임 수준이 높을수록 자아탄력성 수준은 낮았다. 반면 여자 고등학생의 경우 부모로부터 높은 수준의 방임을 경험할수록, 자아탄력성 수준은 낮았으며, 또래애착과 교사친밀감 수준이 높을수록 자아탄력성 수준이 높았다. 한편 남자 고등학생에 한해서 또래애착이 부모학대가 자아탄력성에 미치는 영향을 조절하였으며, 구체적으로 또래애착이 낮은 경우 부모학대경험이 자아탄력성에 미치는 정적 영향력이 존재하는 것으로 나타났다. 둘째, 남자와 여자 고등학생 모두 부모로부터 경험한 학대와 방임수준이 높을수록 자아존중감 수준은 낮았으며, 또래애착과 교사친밀감 수준이 높을수록 자아존중감 수준이 높았다. 한편 여자 고등학생에 한해서 또래애착이 부모학대 및 방임경험이 자아존중감에 미치는 영향을 조절하였다. 구체적으로, 또래애착이 낮은 경우 부모학대경험이 여자 고등학생의 자아존중감에 미치는 부적 영향력이 존재한 반면 또래애착이 높아질수록 부모방임이 여자 고등학생의 자아존중감에 미치는 부적 영향력이 커졌다. 마지막으로 이상의 주요결과를 토대로, 학교현장에서 부모학대 예방차원에서의 가정과 교과의 역할과 학대경험 남녀 청소년을 상담 시, 고려할 점을 제안하였다.

• 대한간호학회지
• /
• 제4권2호
• /
• pp.144-158
• /
• 1974

This study was undertaken in an attempt to; 1) measure value orientation of nursing activities, 2) identify the relationship between nurse's role perception and patient's expectation, and 3) evaluate the pattern of nursing education and nursing service administration. 203 hospitalized adults and 203 professional nurses from 11 general hospitals in Seoul during the period of July to December 1973 were tested according to questionnaire based on 4 categories of clinical nursing activities, 1) physical care, 2) observation and control, 3) psycho-social care and 4) therapeutic measures. Results of the study are as follows: 1. Nurses were more concerned than patients in the physical care category. Significant difference was revealed by p<.01 level (t=2.800). Mean value score of nurses was average (2.84), and mean value score of patients was relative' y low (2.49). None of the physical care category questionnaire items were over 3.5. 2. Respondents from hospitals of total care system revealed significant difference in the physical care category by P〈.025 level. (t=2.242). Mean value score of both group were average level (nurse 2.90, patient 2.53), nurses showed higher concern. 3. Difference between nurse's role perception and patient's expectation in observation and control category was revealed non- significance by p〉0.05. level (t=1.238). Mean value score of both group revealed relatively high (nurse=3.44, patient 3.19). 4. Difference between nurse's role perception and patient〉expectation in psycho-social cart category revealed non- significance by p〉.05 level (t=0.758), Mean value score of both group revealed average level (nurse =2.71, patient =2.53), 5. Non- significant difference was noted between B. S. N. and diploma nurse's role perception in the psycho- social care category by p> 0.1 level (t=0.316). 4. Difference between nurse's role perception and patient's expectation in the rapeutic me assures category revealed non- significance by p〉0.05 level) t=0.503). Horses showed high concern by mean value score 3.56 level and patients relatively high by 3.41. All items of this category revealed very high or relatively high value score.

• 한국해안·해양공학회논문집
• /
• 제20권1호
• /
• pp.14-24
• /
• 2008

목포와 제주를 위시한 서남해안에서 최근 예측 고조위가 증가하는 경향을 보이고 있다. 조화분석을 통한 자료분석 결과 서남해안 전반에 걸쳐 평균해수면이 뚜렷하게 증가하는 반면 반일주조의 진폭은 감소하는 것으로 나타나고 있다. 또한 태양연주조(Sa분조)의 진폭이 증가한 것으로 나타나고 있으며 이에 따라 하절기의 고조위가 더욱 상승한 것으로 확인되었다. 21세기 들어 RUSA와 MAEMI등 대형 태풍의 발생이 잦아지고 있어 1990년대에 비해 서남해안에서의 최대해일고가 크게 증가하였다. 또한 이들은 7월${\sim}$9월에 집중되고 있어 하절기 고조위 상승과 함께 이상고조위 발생 가능성을 더욱 우려스럽게 하고 있다. 특히 목포해역은 하구언과 방조제 건설이후 이상고조 발생 가능성이 현격히 높아진 해역이므로 더욱 그러한 실정이며, 평균해수면 상승경향이 매우 뚜렷한 제주해역 역시 향후 이상고조 발생 가능성이 매우 높을 것으로 판단된다.

• 가정과삶의질연구
• /
• 제19권1호
• /
• pp.53-62
• /
• 2001

The purpose of this study was to explore the relationship of marital violence and marital unstability. A total of 192 marital couples in Pusan completed a structure questionnaire. The major finding were as follows : 1. Husbands and wives reciprocally inflicted psychological aggression and physical violence. 2. Violent couples who were high level of marital unstability had worse family system function than violent couples who were low level of marital unstability. Violent husbands who were high level of marital unstability were disengaged and chaos family system. 3. Husbands inflicted violence toward their wives when husbands had the contempt of communication style, and their family function were disengaged level. Wives inflicted violence toward their husbands when wives had the contempt of communication style. Couples who had high level of marital unstability were more likely to violent and were disengaged level on Circumplex Model.