• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제7권2호
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• pp.153-160
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• 1996

본 연구의 목적은 청소년 행동장애의 예후에 영향을 미치는 요인들을 알아보기 위한 것이었다. 이를 위해 저자들은 행동장애의 진단 하에 6개월 이상 입원치료를 받은 후 퇴원한 청소년 환자들을 대상으로 퇴원후 6개월 동안에 행동장애의 진단기준에 다시 부합되는지 여부에 따라 예후가 양호한 군 37명과 예후가 불량한 군 36명을 선발하였으며 입원기간동안 완료된 청소년 자가 보고척도 및 다면적 인성검사, 한국판 웩슬러 지능검사를 통해 두 군의 비교를 시행하였다. 본 연구에서 얻어진 결과들은 다음과 같다. 1) 청소년 자가보고척도에서 전체 문제점수와외면화 증후군의 점수, 그리고 비행척도의 점수가 유의하게 높고 그 이외의 척도에서는 유의한 차이가 없었다. 2) 교육정도, 사회경제적 상태, 부모의 교육정도 등의 가족환경 요소들 중에서 두 군간에 유의한 차이를 보이는 요소는 없었으나, 사회경제적 상태의 경우 예후가 불량한 군에서 더 높은 경향을 보였다. 3) 다면적 인성검사에서 두 군간에 유의한 차이를 보이는 척도는 없었다. 4) 한국판 웩슬러 지능검사상 두 군간에 전체 지능지수의 유의한 차이는 없었다. 결론적으로 절대적인 문제행동의 양이 많았던 경우에서 예후가 불량 것이라는 가설을 본 연구결과에서 확인할 수 있었다.

• 조명전기설비학회논문지
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• 제18권1호
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• pp.28-35
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• 2004

질소는 안정한 가스로서 잘 알려져 있지만, 해리, 여기, 선리 등의 반응이 일어나기 시작하면 활성도가 높아지게 되고 오랫동안 유지되는 특성을 갖고 있다. 이러한 반응 및 전송과정을 이용하는 예가 많은 분야에서 볼 수 있다. 현재 질소 가스만의 특성 분석 연구에 관한 보고는 상당히 부ㅈㄱ하며 이러한 부분에 대한 연구가 필요하다고 볼 수 있다. 본 연구에서는 질소 플라즈마의 특성을 상세하게 이해하기 위해, 용량 결합형 프라즈마의 1차원 유체 모델에 의한 시뮬레이션을 행하였다. 하전입자의 밀도, 공가 전계 및 전자 에너지 등의 기본적인 움직임을 혹인하고, 전기적으로 정의 가스에서는 발생？ 않는 전기적 이중층의 형성을 분석하였다. 또한 전원 전압을 300∼700 [V] 로, 압력을 0.2∼2.0 [Tow] 로 변화시켜, 그에 따른 플라즈마를 구성하는 각 입자들의 특성을 고찰하였다.

• 한국항공우주학회지
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• 제48권9호
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• pp.717-724
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• 2020

본 논문에서 액체로켓엔진용 연소기 산화제 개폐밸브로 사용되는 밸브 개방 자체유지가능형 포핏 밸브의 밸브 닫힘 작동특성에 대한 연구 내용을 소개하기로 한다. 상온 및 극저온 환경에서 밸브 닫힘 특성을 예측할 수 있는 수치해석 방법을 제시하였으며, 시험결과와의 비교를 통해 계산결과의 신뢰성을 검증하였다. 본 연구를 통해 상온 및 극저온 작동 환경에서 각각 구동가스 배출 시스템의 유효 유로 면적과 밸브 작동부에 작용하는 운용유체의 압력 분포가 밸브의 전반적인 닫힘 작동특성을 좌우하는 주요 변수인 것을 확인하였다. 또한 극저온 작동 환경에서 구동가스를 적절히 활용함으로써, 밸브 닫힘 압력을 유연하게 조정할 수 있을 뿐만 아니라 밸브 닫힘 속도 또한 효과적으로 감소시킬 수 있음을 확인하였다.

• 한국진공학회지
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• 제21권3호
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• pp.121-129
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• 2012

진공을 기초로 한 극판 전력이 인가된 유도 결합 플라즈마 소스에 관한 대부분의 연구는 자기 바이어스 효과에만 한정되어 있으며, 다양한 반도체 및 디스플레이 식각 공정에서 공정 결과와 소자 품질에 결정적인 역할을 하는 플라즈마 변수들(전자 온도, 플라즈마 밀도)과 극판 전력의 상관관계에 대한 연구는 거의 없는 실정이다. 본 연구에서는 극판 전력이 플라즈마 변수에 미치는 영향에 관한 내용을 다루고 있으며, 최근의 연구 결과에 대한 리뷰를 포함하고 있다. 플라즈마 밀도는 극판 전력 인가에 의하여 감소 또는 증가하였으며, Fluid global model에 의한 결과와 잘 일치하는 경향을 보였다. 전자 온도는 RF 바이어스에 의하여 증가하였으며, 전자 에너지 분포 측정을 통하여 전자 가열 메커니즘을 관찰하였다. 또한, 플라즈마 밀도의 공간 분포는 극판 전력에 의하여 더욱 균일해짐을 알 수 있었다. 이러한 극판 전력과 플라즈마 변수들의 상관관계와 전자 가열 메커니즘에 대한 연구는 방전 특성의 물리적 이해뿐만 아니라, 반도체 식각 공정에서 소자 품질 및 공정 개선을 위한 최적의 방전조건 도출과 외부 변수 제어에 큰 도움을 주리라 예상된다.

• Journal of Power Electronics
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• 제15권6호
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• pp.1673-1681
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• 2015

A low dropout (LDO) regulator with a wide-bandwidth is proposed in this paper. The regulator features a Human Body Model (HBM) 8kV-class high robustness ElectroStatic Discharge (ESD) protection circuit, and two error amplifiers (one with low gain and wide bandwidth, and the other with high gain and narrow bandwidth). The dual error amplifiers are located within the feedback loop of the LDO regulator, and they selectively amplify the signal according to its ripples. The proposed LDO regulator is more efficient in its regulation process because of its selective amplification according to frequency and bandwidth. Furthermore, the proposed regulator has the same gain as a conventional LDO at 62 dB with a 130 kHz-wide bandwidth, which is approximately 3.5 times that of a conventional LDO. The proposed device presents a fast response with improved load and line regulation characteristics. In addition, to prevent an increase in the area of the circuit, a body-driven fabrication technique was used for the error amplifier and the pass transistor. The proposed LDO regulator has an input voltage range of 2.5 V to 4.5 V, and it provides a load current of 100 mA in an output voltage range of 1.2 V to 4.1 V. In addition, to prevent damage in the Integrated Circuit (IC) as a result of static electricity, the reliability of IC was improved by embedding a self-produced 8 kV-class (Chip level) ESD protection circuit of a P-substrate-Triggered Silicon Controlled Rectifier (PTSCR) type with high robustness characteristics.

• 멤브레인
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• 제26권4호
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• pp.310-317
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• 2016

리튬이온 이차전지는 리튬이온이 이동하면서 전기화학적 충방전사이클을 완성하는 에너지변환장치를 의미한다. 리튬이온 이차전지는 높은 에너지밀도와 낮은 자가방전률, 상대적으로 긴 수명주기 등 다양한 장점을 갖는다. 최근 전기차 수요증가는 고용량 리튬이온 이차전지 개발을 촉진하고 있으나 음극에서의 dendrite 형성으로 인한 전기적 단락 현상과 전지 폭발 문제와 같은 심각한 안전문제를 야기한다. 또한, 리튬이온 이차전지 구동시 상승된 온도에서 폴리올레핀계열(예 : 폴리에틸렌과 폴리프로필렌) 격리막의 열수축 문제가 발생한다. 이와 같이 낮은 열 안정성은 리튬이온 이차전지의 성능과 수명의 감소로 이어진다. 본 연구에서는 폴리올레핀계열 함침격리막 제조를 위한 중요한 소재로서 술폰화 폴리아릴렌에테르술폰 랜덤 공중합체를 사용하였으며, 제조된 격리막을 이용하여 dendrite 형성과 관련된 금속이온 흡착 능력과 리튬이온전도성, 열적 내구성이 평가되었다.

• Child Health Nursing Research
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• 제5권1호
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• pp.84-96
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• 1999

The purpose of this study was to find whether the educational program contributed to the increase of caring confidence and rearing attitude of the newborn mothers. The subjects for this study were 40 newborn mothers-20 control group and 20 experimental group-who delivered a normal neonate and were gotten general informations from the nurses at the K medical center in Seoul. Especially, the experimental group was educated for 30-40 minutes in maternal educational program through lectures, demonstrations, discussion with textbooks and visual materials by a researcher at 2-3 days after delivery. The data were collected two times-at 2-3 days after delivery and at 4 weeks after discharge-from October, 1998 to January, 1999 by investigators interviewing with a structured questionnaire. Pharis(1978)'s self confidence scale was used after some modification to measure caring confidence and Cohler's maternal attitude scale to check mother's rearing attitude. Analysis of data was done by using of frequency, %, x²-test, Independent sample t-test. The results of this study were as follows ; 1. The Confidence of the experimental group was significant higher than the control group (t=2.519, p=.016) and the rearing attitude changed more positively(t=5.545, p=.000). 2. In the confidence scale, the statements having a significant change were holding a baby, changing diapers, feeding, and caring umblicus. 3. In the rearing attitude scale, the statements having a significant change were 12 of 20 statements.

• 기본간호학회지
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• 제4권2호
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• pp.229-243
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• 1997

Especially in NICU(Neonatal Intensive Care Unit), handwashing is an important factor in decresing nosocomial infections due to reduced immunity, prematurity and various invasive procedures. The purpose of this study was to investigate the basic characteristics related to handwashing by NICU nurses. It was composed of three parts ; questionnaire survey I (genoral characteristics of handwashing), questionnaire survey II(the awareness degree of handwashing importance) and actual performance. This study was performed from Oct. 8 to 14 in 1994. The results of this study were as follows ; 1. Frequency of handwashing were different by shift of working about 47.1% of the respondents. They were washing most frequently during day-shift about 75% of above. According to self evaluation to handwashing frequency, 64.7% of the respondents said their frequency of handwashing was inadequate, because of being too busy.(45.1%), bothering caused by detergent or disinfectant(17.6%), and too far from handwashing facilities(17.6%). 2. The most common handwashing agent was soap(88.2%), 52.9% of the subjects experienced adverse effects after handwashing ; rough hand(44.5%), dryness(33.3%) All subjects washed their hands with running water, and 70.6% of the subjects washed upto wrist. In duration of handwashing, 52.9% of subjects washed hands 5 to 10 seconds, 29.5% of them did 11 to 15 seconds. 3. 29.4% among subjects had participated to take in the handwashing educational program. About 60% responded they would like to take the course of handwashing if possible. 4. The important nursing activities that need handwashing were chaning of caring ostomy, suctioning, chaning IV dressing site. On the other hand, they responded handwashing was not essential before dealing with omitus, before and after transfering machine, before chaning diaper(stool) 5. Handwashing performance was 61.7%. Among seven nursing activities, suctioning(73.4%) was the highest, the next was dealing with discharge or sampling(71.1%), the lowest was bathing(34.6%). The performance was better after(70.2%) nursing activities that before(52.5%), and day(63.6%) or evening(68.3%) shift than night(56.7%)

• 대한소아치과학회지
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• 제24권3호
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• pp.678-687
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• 1997

Cystic lesions of the mandible are fairly common and usually a presumptive diagnosis is made readily, more often on the basis of roentgenographic appearance than by any other means. Occasionally, however, it is easy to fall into errors of diagnosis which may affect one's choice of treatment. The diagnosis in these situations are usually resolved by the histopathologic examination of material obtained by surgical exploration. The present discussion to the lesions which can be most easily confused in the roentgenographic interpretation, that is, the traumatic bone cyst, the dentigerous cyst, the radicular cyst. These lesions often grow to considerable size before they cause any subjective or objective symptoms. Less frequently, perhaps, the patient presents himself with the complaint of enlargement of the affected part, a discharge, or pain. On rare occasions the first sign is fracture through the cyst cavity. In any case, an adequate roentgenographic survey by means of extraoral films is essential. This is the primary means of diagnosis. The three lesions in mandible, reported here, resembled each other roentgenographically in that they were osteolytic lesions. The follicular and radicular cysts usually have a smooth periphery and may be surrounded by a white line. The follicular cyst, slow-growing lesions, is usually associated with an unerupted tooth. The radicular cyst, the most common type of the odontogenic cyst, is always associated with a nonvital tooth, or it may persist as a "residual" radicular cyst after the causative tooth has been extracted. The traumatic bone cyst can often be differentiated from the first two in that the periphery is less definite and is irregular. It is thought that because it does not occur in older people, the lesion is self-limiting and heals spontaneously if left alone.

• 여성건강간호학회지
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• 제6권2호
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• pp.218-233
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• 2000

The purposes of this study were to investigate the physical discomforts and sexual life pattern and to identify the relation between the physical discomforts and the satisfaction of sexual life in women with hysterectomy. The subject were 301 women who lived with their spouses from 3 months to 2 years after hysterectomy in S. University Hospital. The data were collected using a self-reported questionnaire by mail, which composed of 25 items of physical discomforts, restarting time and frequency of sexual intercourse, and 10 items of sexual satisfaction, The results were as follows: 1) The mean score of physical discomforts was 13.22 and range of score was 0-45. 1.7% of 301 women had no physical discomforts and 12.0% of them complained of severe physical discomforts such as fatigue, lumbago and pain of extremities. 2) The women with hysterectomy complained of fatigue(76.1%), lumbago(68.8%), pain of extremities(63.5%), weight gain(55.5%), vaginal dryness(50.8%) and symptom of estrogen deficiency such as perspiration (47.5%), flush(41.2%) and palpitation (38.5%). As unusual symptom, numbness of thigh (20.3%) and acne(16.3%) were identified. 3) There was no significant difference between the degree of physical discomforts and the laps of time after hysterectomy. But the score of physical discomforts was lower in women with vaginal hysterectomy than in women with abdominal hysterectomy. 4) The mean score of sexual satisfaction was 33.11 and range of score was 10-50. There was no significant difference between the degree of sexual satisfaction and the lapse of time after hysterectomy. 83.8% of women had not change of sexual life satisfaction after hysterectomy. The women restarted sexual intercourse in average 2.57 months after hysterectomy. 5) There was a negative correlation between the physical discomforts and the sexual satisfaction. In conclusion, nurses should make the discharge educational program of the physical discomforts and the sexual pattern for women with hysterectomy in hospital.