연령증가에 따른 혈압요소들의 좌심실비대 및 관동맥질환과의 관련성

박재석,박창규,박미영,박재형,김용현,나진오,신성희,서순용,홍순준,박성미,임홍의,김응주,서홍석,오동주,노영무 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

Flexible Optoelectronics: Flexible Inorganic Nanostructure Light‐Emitting Diodes Fabricated on Graphene Films (Adv. Mater. 40/2011)

Lee, Chul‐,Ho,Kim, Yong‐,Jin,Hong, Young Joon,Jeon, Seong‐,Ran,Bae, Sukang,Hong, Byung Hee,Yi, Gyu‐,Chul WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.40

<P>Inorganic‐based flexible light‐emitting diodes (LEDs) using single‐crystalline GaN/ZnO coaxial nanorod heterostructures grown directly on large graphene films are reported on page 4614 by Gyu‐Chul Yi and co‐workers. The LEDs demon‐strate reliable operation in a flexible form, with no significant degradation in their electroluminescent or electrical characteristics. This approach provides a general and rational route to develop many different inorganic optoelectronics in flexible or stretchable forms. </P>

관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

CNC 선반에서 볼 나사 열변형에 따른 위치결정 정도 개선에 관한 연구

홍성오,조규재,김재열 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.1

Thermal expansion of the ball screw can directly affect the accuracy of positioning along the ravel axis in the semi-closed loop type CNC Lathe. In this paper, use of MACRO variables can make the thermal displacement of the ball screw estimated. Also, the estimated displacements of the ball screw are controlled by calculation the interval of pitch error rate in the Numerical Control(NC). Under the constant operating conditions, the thermal expansion of the ball screw was measured to confirm the effectiveness of the compensation method in the CMC Lathe. By using this method the results show that the thermal displacement of the ball screw could be reduced to 20% compared with ordinary method.

대구지하철 화재시 피난자 행동유형 분석을 통한 지하공간 안전피난대책에 관한 연구

홍원화,전규엽 대한건축학회 2005 대한건축학회논문집 Vol.21 No.1

In Korea, the Seoul subway line 1 was opened In 1974 and the subway service is being operated In Seoul, Pusan, Daegu, and Inchon The subway station is related to a underground shopping mall that was developed as complex spaces According to the time of people's stay at the underground space, the necessity about the safety countermeasure of the underground space has been enlarged Consequently, the efforts to minimize the damage of human life and property from similar underground fire occurrence or disaster is important In this research, we analyzed the survivors behavior's pattern and the way of evacuation from the Daegu subway fire disaster on Feb 18 2003, In which 192 people were killed and 148 injured We investigated about survivors of the Daegu subway fire and analyzed the factors of human behavior and evacuation in the underground space fire As a result of research, greater part of the interruption to escape is the loss of the direction to escape We need to install with suitable guidance devices according to the fact we have The device should be equipped with not only visual indication but also with tangible and audible

17β-Estradiol의 심근 보호작용에 대한 연구 ; 재관류 부정맥을 유발한 동물실험

홍정석,김원,조규종,이미우,장성은,임경수 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: Although reperfusion certainly prevents tissue ischemia from possible cardiac death, several lines of evidence suggest that reperfusion may paradoxically aggravate the frequency of serious reperfusion-induced lethal arrhythmias. It has been reported that acute administration of estrogen at physiological concentrations reduced with myocardial ischemic injury in women with coronary heart disease. In studies with canines, acute administration by either the intra-muscular or the intra-coronary route similarly prevented ischemia and reperfusion dysrhythmias and also reduced the infarct size because the estrogen increased the distal coronary perfusion pressure, scavenged free radicals and had other effects during both ischemia and reperfusion. However, the canine heart is notoriously well collateralized. 17β-estradiol induces very little vasorelaxation in cat coronary rings, suggesting that increased ischemic myocardial blood flow dose not contribute to the protective effect. In the present study, employing a cat model of regional cardiac ischemia, we examined whether reperfusion rendered after acute administration of 17β-estradiol could lower the incidence of reperfusion-induced lethal arrhythmia and the death rate. Method: Adult mongrel male cats(n=31, 2.7∼4.5 kg) were anesthetized under positive-pressure artificial ventilation with room air. Electrocardiograms were recorded. The animals of the control group(n=15) were subjected to 20-minute left anterior descending coronary artery(LAD) occlusion followed by abrupt reperfusion. The animals in the experimental 17β-estradiol(2 or 20 ㎍/kg) group were subjected to ischemia/reperfusion insult following drug treatment: 17 β -estradiol was applied intravenously within the 60 seconds just before LAD ligation followed by abrupt reperfusion. The Fisher's exact test was used to compare the data from different animal groups(p<0.05). Results: The number of arrhythmias(ventricular premature beat, ventricular tachycardia and ventricular fibrillation) emerging during the reperfusion phase were not statistically different from that in the control group. The death rate in the 17β-estradiol 20㎍/kg group was lower from that in the control group(P value = 0.039). Conclusion: Acute administration of 17β -estradiol at a supraphysiological concentration might produce cardioprotective effects, not by modificating the coronary blood flow into the threatened myocardial region, but by other mechanisms that directly or indirectly increase the intrinsic myocardial ischemic tolerance in the cat during the reperfusion phase.

신경망에 의한 지능형 원격학습 상담 시스템의 구현

홍규완 동의공업대학 1998 論文集 Vol.24 No.1

The existing academic institutions are trying to construct a 'new education paradigm', virtual colleges the using internet and web-based technologies to provide quality education services. Many education administrators, scholars and computer scientists say that this new education paradigm is the most attractive concept to remove the time and space limitation of disadvantages of traditional colleges and produce the consumer-oriented education services. However, remote learning systems have disadvantages such as lack of learning control method and learning motivation compared to traditional class learning. In this paper, I implemented an intelligent counselling system for remote learning using a neural network that is excellent for regional division for supporting disadvantages of the remote learning system.

사업장 근로자의 건강위험 평가도구 개발

홍윤철,임현술,하은희,정규철,조희숙,박혜숙,이용애 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.4

Health Risk Appraisal(HRA) is usually defined as a process by which we expect of individual's chances of death or acquiring specific diseases within a defined period of time. The concept of worksite as an area of health maintenance and promotion is newly developing. Our movement for health promotion of employees has been increasingly known in the worksite. The aim of this study is to develop health risk appraisal tools about health promotion at the worksite for employees. We performed this study by two steps; one step was to develop a HRA questionnaire of worksites in Korea, another was to evaluate the reliability of the questionnaire. For developing HRA questionnaire, we reviewed scientific examples at first, and then weighted the score by delphi. To evaluate the reliability of developed questionnaire, we carried out survey by test-retest method. A total of 131 employees completed HRA questionnaire on two times. The results are as follows. The total score of health risk in unhealthy workers was higher than that of healthy workers. The range of test-retest reliability of responses to the questionnaire was 0.57-0.94. Therefore it seems that this questionnaire was very suitable to assess the health behavior of workers. In conclusion, the developed HRA questionnaire can be used as a tool for evaluating health behavior and for providing health counseling materials.

Auto Line에서 공작기계 열변형에 따른 위치오차 억제에 관한 연구

홍성오,조규재 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.1

Development of high speed feed drive system has been a major issue for the past few decades in machine tool industries. The reduction of the tool change time as well as rapid travel time can enhance the productivity. However, the high speed feed drive system generates more heat in nature, which leads thermal expansion that has adverse effects on the accuracy of machined parts. The detail of the model proposed is described in the paper together with the experimental methodologies using a proposed compact measurement system to examine the validity of the proposed approach. The results showed the machining accuracy could be maintained to better than ±5㎛ while using this sensor.

재난 자원봉사의 지원 및 관리 체계 분석 및 제안

홍원화,여명길,전규엽,이지희 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10

The fire at Joong-Ang Ro station of Daegu happened It might be ended as fire happening but proceeded to the disaster giving numerous damage because of the incomplete system of disaster prevention we had taken the lack of understanding and specialization about When Joong-Ang Ro station was restored, situation involved about volunteer system is that some of volunteer teams went back in a few days and activity of volunteers wasn't continued until the restoration was completed Because the volunteer system is thought as a field of social well-being and it was rarely focused on disaster, that situation appeared This paper shows the situation of support and management of volunteers during restoring Joong-Ang Ro station of Deagu There are comparison and analysis of support and management for volunteer among the cases of domestic disaster and foreign one in this paper to suggest the efficient support and management system for volunteer in disaster