젊은 성인에서 흡연에 의한 상완동맥 내피기능의 부전에 관한 연구

이상철,권영주,방덕원,이선해,이보영,김지욱,김영훈,온영근,현민수,김성구 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

Background and Objectives : Cigarette smoking is a major factor and the most modifiable risk factor for atherosclerosis. Endothelial dysfunction is an early event in atherosclerosis, before the structural change of the systemic arteries. We hypothesized that endothelial dysfunction might be present in the systemic arteries of young adult smokers and that this might be dose-dependent phenomenon. Therefore, we try to certify that smoking is associated with endothelial dysfunction in healthy young adults without other risk factor of atherosclerosis. Subjects and Methods : we studied noninvasively 29 subjects aged 3 to 4 decades without other risk factor of atherosclerosis, they were composed of the two groups, current smokers(n=15) and nonsmokers(n=14). Smoking history varied from 3 to 20 pack years. Using high-resolution ultrasound, vessel diameter and mean flow rate were measured at rest, during reactive hyperemia(with flow-mediated endothelium-dependent dilation), and after sublingual nitroglycerin(NG-induced endothelium-independent vasodilation). Result : Flow mediated endothelium dependent dilation was observed in the control subjects (9.4±3.44%) but was impaired in the smokers(5.8±2.51%)(p=0.004). NG-induced endothelium independent dilation is no difference in all subjects. Conclusion : Cigarette smoking is associated with endothelial dysfunction in healthy young adults.

젊은 남자 성인의 칼슘과 철의 영양상태에 관한 연구

박영숙,곽주영,권지혜,류화라 순천향대학교 기초과학연구소 2002 순천향자연과학연구 논문집 Vol.8 No.1

A survey was performed to 174 male young men who were living alone(40 persons) and shared living with friends(4143 persons) in Chungnam province. Their average age was 22.6 years old, height 171.8 ㎝, and weight 65.6 ㎏. Their daily calcium intake level was averaged 271.9±169.1 ㎎, which was 38.8 %RDA. Comparing calcium intake of each mealtime, breakfast, lunch, dinner, and snacks were composed of 18.6%, 30.0%, 34.0% and 17.4%, respectively. Their daily iron intake level was averaged 8.9±10.8 ㎎, which was 74.3 %RDA. Comparing iron intake of each mealtime, breakfast, lunch, dinner, and snacks were composed of 15.4%, 33.6%, 36.3% and 14.7%, respectively. These results suggested that deficiency of the two minerals in young male adults were severe and the nutrient qualities were also poor, no matter of their living alone or with accompanies. The deficiency was more profound in calcium than iron. And we observed iron nutriture differed significantly according to their living status, such as iron intake and its %RDA were significantly worse in single living subjects than the others. However calcium did not show significant difference. We concluded that shared living environment in young male adults could possibly improve their dietary mineral intake levels.

Fe-0.7%C-2.3%Si강의 미세조직과 기계적 성질에 미치는 잔류 오스테나이트 변태 거동

손제영 ( Je Young Son ),권도영 ( Do Young Kwon ),김지훈 ( Ji Hun Kim ),김원배 ( Won Bae Kim ),예병준 ( Byung Joon Ye ) 한국주조공학회 2012 한국주조공학회지 Vol.32 No.3

This steel has been synthesized integrating concepts from Austempering Ductile Cast Iron (ADI) technology. While ADI has excellent mechanical and physical properties, the Young`s modules of ADI is approximately 20% lower than steel. In addition, the presence of graphite nodules in ADI can be sites of crack initiation, where fracture takes place at graphite matrix interface. Because of this limitations of ADI, there has been a growing interest in austempered steels as structural materials in resent years. In this investigation, a new steel with microstructure composed of ferrite and austenite and with simultaneous high tensile strength (1,150MPa) and high ductility (33%) was developed. The goal of this investigation is to obtain a better understanding of deformation and transformation behaviour in high carbon retained austenite(γHC) and over-saturated ferrite(α) during the plastic deformation. A detailed study of the microstructure of this steel was carried out by means of X-ray diffraction (XRD) and electron back scattering diffraction (EBSD) technic. In this way it was shown that BCC phase (BCC) took up the larger part of the nominal strain whereas the a part of retained austenite responded to the mechanincal load by partial martensite transformation, and misorientation change in the retained austenite after plastic strain could be attributed to the large elongation.

연구논문 : 대학생들의 인터넷 중독에 영향을 미치는 요인에 대한 연구

권미영 ( Mi Young Kwon ),황지영 ( Ji Young Hwang ),정혜윤 ( Hye Yoon Jung ),송시형 ( Shi Hyeong Song ) 극동대학교 사회복지연구소 2013 글로벌사회복지연구 Vol.3 No.2

본 논문의 목적은 대학생의 인터넷 중독에 영향을 주는 요인에 대한 분석을 통해 대학생의 정신건강을 위한 공적프로그램 도입에 대한 함의를 제공하는 것이다. 분석자료는 을지대학교 강남 을지 병원 중독연구소에서 대학생 453명을 대상으로한 설문지이다. 설문조사에 사용된 설문지는 인터넷 중독을 측정하는 인터넷 중독 척도(Young척도), 불안을 측정하는 불안척도(STAI)와 우울을 측정하는 Beck의 우울척도(BDI)로 구성되었다. 분석결과 첫째, 연령 및 학년은 인터넷 중독에 유의미한 영향을 미쳤다. 둘째, 나이가 어릴수록, 학년이 낮을수록 불안과 우울에 빠지기 쉬웠다. 셋째, 무엇보다 불안이 대학생의 인터넷 중독에 가장 큰 영향을 미치는 요인이었다. The purpose of this research to suggest implications on introduction of public-program for college students` mental health through analysing the factors which impact on internet addiction of college students. The analysing data is questionnaire intended to 453 college students in Kang- Nam Eulji hospital addiction institute. The questionnaire consisted of internet addiction scale (Young-scale), anxiety scale (STAI) and depression scale (BDI). This study reveals three main findings. Firstly, age and grade have an effect on internet addiction. Second, the younger, the lower grade, they are likely to be depressed and anxiety. Third, most of all, the anxiety has the most effect on internet addiction of college students.

창작무용 프로그램 참여가 청각장애아동의 평형성과 신체균형의 변화에 미치는 영향

권혜영,서지혜 韓國舞踊敎育學會 2010 韓國舞踊敎育學會誌 Vol.21 No.1

The purpose of this study was to investigate the effect of the balance and body s equilibrium on creative dance program of the children with hearing deficits. Twenty subjects was divided two groups as test group and control group. The balance and body's equilibrium was tested before and after the program. The balance was significantly statistical differences in "single leg standing on closed eye" and "forward walking". The body's equilibrium was significantly statistical differences in "right, left, front, back balances". The creative dance program of the children with hearing deficits was affirmative in the balance and body's equilibrium. From the results, we could prepare basis upon which to improve the balance and body's equilibrium of the children with hearing deficits by the creative dance program. We believe that study will help to develop a similar study and propose a experimental grounds.

관동맥 조영술상 관동맥의 심근교 현상에 관한연구

권영주,목지오 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2

BACKGROUND: Myocardial bridging is defined as embedment of a segment of the coronary artery into the myocardium so that during ventricular systole the segment of artery is compressed. The prevalance of myocardial bridges among consecutive patients coronary angiography varies between 0.5% and 16% with most studies reporting an incidence of less than 2%. Because any studies is not reported about myocardial bridging in Korea, this study was done to establish the angiographic evidence of myocardial bridging in cineangiograms performed in the cardiac laboratory of the Soonchunhang University PATIENTS AND METHODS: In the 10-years period between 1987 and 1996, selective coronary angiography was performed on 1079 patients at the Medical University of Soonchunhang Hospitals. All studies were reviewed and patients were divided into three groups on the basis of the degree of systolic compression: Mild(1-30% systolic compression). Moderate(31-50% systolic compression), and Severe(51-100% systolic compression). RESULTS: 1. 10 PATIENTS(0.93%) Were found to have myocardial bridge. and 9 patients had systolic compression of the left anterior descending coronary artery and one patient had compression of the right coronary artery. 2. Cineangiograms of all 292 "normal" patients who had symptomes suggestive of angina pectoris were reviewed and 7 patients(2.4%) were found to have myocardial bridging. 3. 4 patients had mild myocardial bridge, 1 patient had moderate, and 5 patients had severe. 4. The ECG was normal in 4 patients, showed left ventricular hypertrophy in 5 patients, and showed atrial fibrillation. Treadmill exercise test was positive in 5 patients, and non-diadnostic test due to insufficient exercise capacity was 5 patients. CONCLUSIONS: The angiographic incidence of myocardial bridges was noted was noted 0.93% and most common site is the left anterior descending artery.

청소년이 지각한 부모의 학습관여행동과 공격성의 관계에서 학업스트레스의 매개효과

권지영(외 1명) 신라대학교 (부산여자대학교) 학생생활연구소 2016 學生生活硏究 Vol.36 No.-

본 연구는 청소년이 지각한 부모의 학습관여가 청소년의 공격성에 어떠한 영향을 미치는지 알아보고, 학업 스트레스의 매개효과를 검증하고자 하였다. 이러한 목적을 위해 부산 북구에 소재하는 N 고등학교 1학년 남녀 학생 305명을 대상으로 하였다. 측정도구는 부모학습관여행동 척도, 학업스트레스 척도, 공격성 척도를 사용하였다. 본 연구의 결과는 다음과 같다. 첫째, 부모학습관여가 학업스트레스에 영향을 미치는지 확인한 결과 부모학습관여의 하위 변인인 학업성과압력만 학업스트레스에 유의한 영향을 미치는 것으로 나타났다. 둘째, 청소년이 지각하는 부모의 부정적 학습관여인 학업성과압력과 공격성의 관계에서 학업 스트레스의 매개효과를 확인한 결과 부모의 학업성과압력은 청소년의 공격성에 직접적 영향을 미치는 동시에 학업스트레스를 매개로 간접적인 영향도 미치는 것으로 나타났다. 이러한 결과를 통해 학업성과압력이 청소년의 학업스트레스와 공격성에 직,간접적 영향을 미치는 중요한 요인이라는 것을 알 수 있었다. 본 연구결과를 토대로 부모들의 학습관여행동이 청소년에게 미치는 영향에 대한 논의를 시도하였다.

브롬이온존재하에서 플라즈마에 의한 암모니아의 탈질에 관한 연구

권지영,임익현,정팔진 全北大學校 附設 都市및環境硏究所 2000 都市 및 環境硏究 Vol.15 No.1

This study was the basic experiment of direct denitrification of NH_3-N. The synthetic wastewater(10㎎/L as NH_3-N) in presence of bromide ion was treated by plasma. The results as follows ; When bromide ion was not present in the wastewater, nitrification or denitrification did not occur. Denitrification of ammonia by plasma in presence of bromide ion was increased in proportion to bromide ion.

AZ91 합금융체내의 Fe 용해도

권순일,변지영,김선진,심재동 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.1

Fe solubility in AZ91 alloy melts was measured by a new method designed for removal of Al_(8)(Mn,Fe)_(5) inclusions. In the AZ91 alloy melts, Al_(8)(Mn,Fe)_(5) precipitates were formed due to supersaturated Mn and Fe, but all precipitates were not settled down from the melts and hence part of them was included in the samples for measuring Fe solubility. This means that the solubility measured from these samples is higher than the true solubility. In the present study, it was shown that these Al_(8)(Mn,Fe)_(5) inclusions could be separated from the samples by the new method. As a result, the Fe solubility measured by the present method was lower than the previous solubility data. Amount of the unsettled Al_(8)(Mn,Fe)_(5) inclusions was estimated to be 59-148 ppm. It was also observed that Fe contents in Al_(8)(Mn,Fe)_(5) were varied with the Fe and Mn content in AZ91 alloy melts.

브레이징법에 의한 TiA1 금속간 화합물의 접합에 관한 연구

권영순,권용재,김지순,김환태 울산대학교 1995 공학연구논문집 Vol.26 No.2

본 연구에서는 Al을 삽입금속으로 사용하여 브레이징법으로 접합한 TiAl 금속간화�물의 접합특성에 대하여 조사하였다. 삽입금속인 Al과 모재인 TiAl과의 반응에 의해 접합계면에서는 반응생성층으로서 경도가 모재보다 높고 취약한 TiAl₃가 형성되었으며, 접합온도가 600℃로 낮았거나 가열속도가 30K/min으로 너무 빠를 경우에는 반응생성층내에 void와 미소균열과 같은 접합결함이 존재하였다. 이와 같은 접합결함들은 700℃보다 높은 온도에서 접합하거나 가열속도를 10K/min보다 낮게 하여 접합한 경우에는 나타나지 않았다. 한편 접합체의 기계적 성질의 향상을 위하여 접합 후 Ar가스 분위기에서 열처리를 행한결과, 1300℃에서 3시간 동안 열처리를 했을 경우 모재와의 조성의 균일화가 완전히 이루어지지 않았으며 또한 반응생성층의 형태도 변화가 없었다. 그러나 1350℃에서 3시간 동안 열처리한 결과 조성의 균일화와 함께 반응생성층은 ??단상으로 변하였으며, 반응생성층의 미소경도는 층상조직인 모재의 미소경도보다 조금 낮게 나타났다. In this study, Joining properties of TiAl intermetallic compound bonded by brazing method using an insert metal of Al foil were investigated. A brittle reaction product layer. TiAl₃was formed at the joining interface and its microhardness was very higher than that of base metal. When the specimen was bonded at low temperature of 600℃ or with high heating rate of 30K/min respectively, joining defects like void and micro-crack were formed in the in the inside of reaction layer. These joining defects were disapeared when the speciment had been bonded at higher temperature than 700℃ or with lower heating rate than 10K/min. For the purpose of improving the mechanical properties of joints, effects of the post-bond heat treatment in Ar gas atmosphere on microstructure and hardness distribution of the bonded speciment were studied. When the joint was geat-treated at 1300℃ for 3 hr, homogenization of the compositions in the joining interface region was not achieved completely and morpholgy of the reaction product layer was still remained without morphological change. However, when the joint was heat-treated at 1350℃ for 3 hr, homogenization of the compositions in the joining interface region was achieved and the reaction product layer changed to γ single phase. And micro-vickers hardness of reaction layer region was slightly lower than that of base metal.