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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>
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
홍성오,조규재 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
One of the important technical issues is how to decrease thermal expansion of ballscrew in proportion to the increase of machining speed, when measuring force of stretch of ballscrew, since not only actual expansion and the value of bending have to be considered, it's impossible to define that exact value of expansion. In addition, support bearings of ballscrew gain considerable force in axial direction. It also generates thermal expansion on the ballscrew, and deteriorates the bearings. In conclusion, it's impossible to give the pretension enough to absorb the all elongation due to thermal expansion generated during machine running. If gave, bed, column and saddle are all bent to change machine accuracy, and the support bearings of ballscrew are damaged. The purpose of this paper is to study the pretension of support bearing of ballscrew in machine tool.
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.
대구지하철화재 현장 수습체계 분석을 통한 신도시 재난대응체제 구축에 관한 연구
홍원화,김태현,전규엽 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10
The disaster was breaking out at JungAnglo station in Daegu It might be ended as a typical fire happening but proceeded to the disaster because of the inappropriate system of disaster prevention we had taken, the lack of understanding and specialization about Even though many cities have been studied about disaster prevention The synthesis operation and management of disaster prevention we used before have not been prevention system Thus investigating and analyzing document about international and domestic urban fire and disaster system keep us, being in force and studying at present We try to get the point and search the system of advanced nation Up to now, the conditions of damage from disasters and accidents in Korea are getting disaster system We compare to system of disaster Japan, American and Korean This is the introduce abstract of fire disaster at Daegu subway and Sampoong department store This study of analyze of the Timetable and system for settlement resulted from disasters too And we setup new disaster confrontation system
유한요소법을 이용한 고주파 열처리시 안내면 변형에 관한 연구
홍성오,조규재 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
Finite element program(ANSYS) estimated thermal deformation quantity in high frequency heat treatment process of a machine tool feed drive system slideway and apply deformation quantity in roughing process. Having processed the heat treatment, minimizing methods of the quantity of deformation heat treatment process. Having done heat treatment with high frequency after taper processing with considering the existed heat treatment generating the quantity of deformation, existed quantity of deformation can be reduced down to 80%, consequently productivity and material saving can be achieved. When high frequency heat treatment finite element method estimated deformation quantity at difference temperature and time. it is progress at cost down and saved time.
대형 건축물의 태양광 발전시설 도입에 따른 경제성 및 환경성 효과분석 : 대구 컨벤션 센터(EXCO)를 중심으로
홍원화,장민호,전규엽 대한건축학회 2004 대한건축학회논문집 Vol.20 No.9
The purpose of a paper is to know the first invest cost, a payback period, and an environmental result on EXCO when we apply a photovoltaic system to it Today, the need for alternative energy has increased due to the global environmental problems and energy depletion Buildings built nowadays have a tendency of getting innovative facilities and play important roles themselves as education and ads After Daegu City has tried to be selected as a Solar City, it makes alternative energy necessary for many public buildings Following this trend, Daegu City has a plan of putting a photovoltaic system on large buildings For instance, EXCO, exhibition and convention building in Daegu, is on the process of having a photovoltaic system. When assuming this project, the first thing we should have is an amount of hourly energy consumption for EXCO The hourly data for the electric energy were gathered by field survey for EXCO. Then, three places on EXCO were regarded of a photovoltaic system Every energy on each place was calculated respectively Considering the first invest cost, the payback period needs about 15 years in an environmental evaluation, the deduction of carbon 야oxide was also obtained with a certain chemistry equation. Evaluating the first invest cost, a payback period, and an environmental result, this paper Will give some information of choosing where to place the photovoltaic system on EXCO
대구지하철화재 소방 활동 조사 분석을 통한 지하 공간 대형화재 시 소방 활동 개선방안에 관한 연구
홍원화,김동식,전규엽 대한건축학회 2004 대한건축학회논문집 Vol.20 No.11
Underground spaces are actively being developed. Especially, the trend of this development is horizontally to connect other buildings by underground floors, that is, to make underground passages among buildings, it seems to be a great network space. Many inexperienced pedestrian are not aware of these passages and are anticipated to be exposed to a great of danger when there is a fire. It happened that the fire at Joong-Ang Ro station of Daegu. It might be ended as fire happening. However, it proceeded to the disaster giving a number of damage because of the incomplete system of disaster prevention. Now we will need the new fire fighting activity's system at the conflagration of underground space. This study is to research the fire fighting activity and to analyze the fire fighting system at the Daegu subway fire. And This data will use in base of fire fighting activity at the conflagration of underground space.