Compensation(보정), Positioning accuracy(위치 정밀도)

홍성오,홍순남,조규재,전언찬 東亞大學校 1997 東亞論叢 Vol.34 No.-

Thermal expension of the ball screw in semi-closed loop type CNC lathe directly introduced positioning errors along the travel axis In this paper the thermal displacement of the ball screw is estimated by using macro variables. The estimated displacementes of the ball screw are given to the NC in the form of pitch error compensation data into time interval.The thermal behaviour of the ball screw of the CNC lathe under the constant driving conditions was measured to examine the effectiveness of this compensation method. The results showed that thermal displacements of the ball screw were the positioning accuracy could be maintained to better than 6μm which using this compensation.

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

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

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.

輻射난방공간의 熱環境 特性에 따른 老人의 主觀的 反應評價에 關한 硏究

전규엽,이상홍,홍원화 대한건축학회 2003 대한건축학회논문집 Vol.19 No.6

This study aims to present the basic data for the establishment of indoor optimal thermal environment in housing for the aged by through field and subject response survey and experiment in model living room. As the first pace of study, the thermal-environment factors were defined by the measurement of physical thermal environment element (dry bulb temperature, radiative temperature, relative humidity, and air velocity) and the environmental needs of the residents was investigated through the questionary survey of the response to thermal environment in welfare facility with radiation heating for the aged in Teagu during winter in 2001. As a result of it, a model living room was designed and structured as a actual domestic room. Physical thermal-environment factors and environmental needs of the occupants in radiative heating space were examined thoroughly by measuring physical thermal environment element and investigating subjective response according to varied condition. The result of study can be summarized as follows; The value of the floor temperature in model living room was 30~34℃ according to temperature control of a constant temperature water tank. In particular, the value of the floor temperature was 33~34℃ and air temperature was 27~28℃ when the constant temperature water tank was 70~80℃. At this point, the value(38~42%) of indoor relative humidity was in the standard(37~48%) of relative humidity comfort. And also, occupants felt somewhat warm at the body on the whole as well as at the lower part of the body. However, the response of occupants was uncomfortable comparatively at the upper part of the body. The reason of that was seemed to be lack of ventilation and stifling atmosphere of the spot.

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

AE 신호를 이용한 회전형 압축기의 이상상태 감시

이감규,정지홍,김전하,강명창,김정석 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.5

The compressor has one of important roles in refrigeration cycle and it determines refrigeration efficiency and quality. This paper aims to monitor rotary compressors for room air conditioners by using Acoustic Emission(AE) technique. The reliability of rotary compressors has been evaluated through visual inspection on them after long term test. This paper describes methods for acquisition and processing AE raw signal to monitor the state of rotary compressor. A detecting method of abnormal compressor in real time is suggested and special-purpose monitoring system which can be applied to automatic manufacturing line is developed using one-chip microprocessor at low cost.

김천시 태풍 '루사' 피해 분석을 통한 도시방재 문제점에 관한 연구

이호영,전규엽,홍원화 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

Every year, a lot of natural disasters has occurred and resulted to not only humans death but also property loss in Korea as well as other countries. Among the natural disasters, floods or tidal waves have made us perplexed economically and socially. Recently many cities are gathering in certain reigns, globalizing and more enlarging, their damages from flood are getting bigger than any other injury and influencing to people and nations themselves as well. Nevertheless, these unfortunate happenings have annually occurred, but no governments have effective ways to prevent many damages referred above. Natural disasters are difficult to predict their occurrences, which are beyond humans ability to control. The effective and systemic countermeasure, however, will make these damages small. Therefore, this thesis has an aim suggesting. The problems of City Prevention of natural disasters by studying the case, City. Kimchun, which had big damages from flood resulted from typhoon, Lusa.

지하공간에서 배경휘도에 따른 유도등 인지효과 분석

손종영(Son, Jong-Yeong),이수호(Lee, Soo-Ho),전규엽(Jeon, Gyu-Yeob),홍원화(Hong, Won-Hwa) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.7

In the case of Daegu subway arson in 2003, it was found out that the evacuation system could not play its own role in the dense smoke and blackout during the fire. Due to the dense cloud of smoke and blackout, the people could not easily find the way out. Proper emergency light plan considered cognitive characteristics of evacuees is set up in such places, if so it will be a great help for evacuation. The information obtained through visual sense induces behaviors intuitively. So, effective evacuee guidance is implemented by installing various evacuation guidance devices (emergency lights and luminous egress guide-lines). In connection with this topic, Jeon Gyu-yeob(2011) carried out an on-the-spot experiment focused on changes in visual perceptional evacuation environment and evacuation abilities. And on the basis of the results, he carried out a study on changes in evacuation behaviors through visual perceptional restriction. However, studies on characteristics of visual perception that has an effect on behaviors of evacuees and evacuation behaviors are not sufficient. Therefore this study examined the effect of background luminance of the emergency light induced to recognize the emergency light. Therefore, to produce a device for adjusting the brightness experiment, this study simulated evacuation experiments were performed for 136 people. The value of the result indicated by seek time of emergency light, evacuation time and emergency light cognition distance.

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>