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연성재료의 균열진전에 따른 A<sub>2</sub>의 변화; 실험적 측정
김헌중,김동학,양경진,강기주,Kim, Heon-Joong,Kim, Dong-Hak,Yang, Kyeong-Jin,Kang, Ki-Ju 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.1
A way to measure the second parameter $A_2$of CT specimens is described. The displacement $\delta$$_{5}$ which is measured continuously from visual images of the lateral surface during crack growth is used to calculate the A, as a function of crack growth. The crack length is measured by DCPD(Direct Current Potential Drop) method and the J-resistance curve is determined according to ASTM standard E1737-96. To prove the validity of this method, three dimensional finite element analyses were performed, and variations of the displacements $\delta$$_{5}$ and $A_2$along the thickness were explored. As the result, it has been shown that the $\delta$$_{5}$ measured from the visual images of the lateral surface and the corresponding $A_2$can be regarded as the average through the thickness for 1T and 1/2T specimens of SA106Gr.C steel.steel.
시뮬레이션 모델링 방법에 따른 열부하 양상에 관한 연구
김헌중(Kim Heon-Joong),최원기(Choi Won-Ki),이현근(Lee Hyun-Geun),서승직(Suh Seung-Jik) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study was focused on the thermal load patterns according to the modelling methods in simulation, so we performed the various simulation analysis to the two same volume buildings which are horizontal and vertical shapes. In this study, we analyzed the solar radiation entering into the zones through windows and the thermal load using the TRNSYS 16. Through this simulation researches, we found the following results ; When zoning, it was recommended to insert the integrated internal wall from the omitted internal walls and the zoning of each story was desirable to integrate the zones to east-west orientation because south wall obtained the most solar radiation. Also in the multi-stories building, what stories were integrated was undesirable to obtain the reliable results but it was possible to integrate each house-hold into one zone. Afterward, we are going to analyze various commercial programs on the modeling methods and estimate the omitted thermal factors in this study such as the shading device, internal thermal capacity, internal heat transfer coefficient and floor heating system, etc..
김헌중(Kim Heon-Joong),이강영(Lee Kang-Young),최원기(Choi Won-Ki),서승직(Suh Seung-Jik) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In case of large office building, generally we can separate the zone into two parts - interior and exterior(perimeter) zone - because the perimeter zones are much affected by the external environments and cold draft from the cold surfaces such as windows. Therefore we have to separatedly design an air-conditioning planning of these provinces. But until now we are absent of the standard of perimeter provinces in various conditions. To solve these problems, we performed the basic study to prepare the Korean standard for perimeter provinces using the TRNSYS simulation program. Also we focused on the thermal load patterns according to the window/wall area ratio and perimeter areas in simple conditions. By checking these result patterns, we could suggest the perimeter boundaries and find the importance of zoning in various conditions.
김헌중(Kim Heon-Joong),이현근(Lee Hyun-Geun),최원기(Choi Won-Ki),서승직(Suh Seung-Jik) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study is for introducing a method by which we could gain proper results from the simulation tools economically, specially in modelling the rounded shape of building. For calculating the effect of the method, we assumed a model of half-round shape, then defined a reference model divided in 10°, a central angle, for evaluating the relative thermal performance. As results, it is necessary to divide the central angle at least as 20° for accuracy, but in case of horizontal division of the round body it is necessary to divide the area into more than 3 sections. Consequently, we could model the building for simulation more easily and economically by dividing the shape body of model as horizontal division, with accuracy as well.
김헌중(Heon-Joong Kim),전문창(Moon-Chang Jeon),김동학(Dong-Hak Kim),강기주(Ki-Ju Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
A new way to measure the second parameter A₂ of CT specimens is described. The displacement δ? which is monitored continuously by real images of the lateral surface during crack growth is used to calculate the A₂ as a function of crack growth. The crack length is measured by DCPD(Direct Current Potential Drop) method and the J-resistance curve is determined according to ASTM standard El737-96. To prove the validity of this method, three dimensional finite element analyses were performed, and variation of the displacements δ? and A₂ along the thickness were explored. It has been shown that the δ? measured from the real images of the lateral surface and the corresponding A₂ can be regarded as the average through the thickness for IT and 1/2T specimens of SAl06Gr.C steel.
독일 체적의 건물 형상에 의한 에너지 소비량 분포 특성에 관한 연구
김헌중(Kim Heon-Joong),최원기(Choi Won-Ki),차동원(Cha Dong-Won),서승직(Suh Seung-Jik) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
This study was focused on the establishment of a fundamental DB(database) that is available in the building design states, so we performed the simulation analysis about the energy consumption on the same volume buildings. Because building energy consumption is affected by the exterior surface area, the ratio of long/short surface length and the adjacent internal surface area etc.. For these purpose, we supposed the unit module and made a constructable 16 model buildings which are composed of the 16 unit modules. Then we analyzed the simulation using the IES_VE and the Seoul weather data. Building energy consumption is more reduced that in case of the smaller exterior surface area, the lower stories building and the larger adjacent surface area. Further study is to be required the sensitivity analysis on the various weather conditions, building shapes and window area etc..
수치 계산을 통한 다목적 BIPV 시스템의 운정방법에 관한 연구
김의종(Kim Eui-Jong),김헌중(Kim Heon-Joong),서승직(Suh Seung-Jik) 한국태양에너지학회 2006 한국태양에너지학회 논문집 Vol.26 No.1
The Multipurpose BIPV System(MBIPVS) was evaluated as an effective passive system through analyzing the thermal performance and the efficiency of PV power generation in the previous papers. To achieve the performance better, the operation method should be determined by considering physical conditions in each occasion. Thus, we choosed the reference operation methods in each season set by the overview of the meteorological data for last 6 years, In-choen, and compared them with the various alternatives that we had made up with for improving thermal performance. The results from adopting various alternatives on MBIPVS showed that the appropriate operational model would be effective to the energy savings ; we could reduce the total loads 1,051.0[㎾h] in summer and 108.9[㎾h] in winter.
동일 체적의 건물 형상에 따른 에너지 소비량 패턴에 대한 분석 연구
최원기,김헌중,서승직,Choi, Won-Ki,Kim, Heon-Joong,Suh, Seung-Jik 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.2
This study was focused on the establishment of a fundamental DB(database) that is available in the building design process, so we performed the simulation analysis about the energy consumption on the various same volume buildings. Because energy consumption in building is affected by the exterior surface area, the ratio of long/short length in surface and the adjacent internal surface area etc.. For these purpose, we assumed the unit module and made a constructable 16 model buildings which are composed of the 16 unit modules. Then we analyzed the simulation using the TRNSYS 16 and the Seoul weather data. In results, energy consumption in building is more reduced that in case of the smaller exterior surface area, the lower stories building and the larger adjacent surface area etc.. Further study is to be required the sensitivity analysis on the various weather conditions, building shapes and window area etc..
이강영(Lee Kang-Young),김헌중(Kim Heon-Joong),최원기(Choi Won-Ki),서승직(Suh Seung-Jik) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
For safety evacuation design of large gathering space such as the shopping mall, we suggested the evacuation zoning method to ensure people's life. To this research, we selected a department store and analyzed the evacuation characteristics using the SIMULEX. In case of general conditions, total evacuation time was 765 seconds because of pouring and stagnating in the specific exits. But in case of zoning in one stories, total evacuation time was 680 seconds and was able to save about 1 minutes. Also in case of zoning in all stories, that time was 585 seconds. Therefore if it was considered the evacuation zoning method in the initial evacuation design steps, we could design the more safety building and escape a terrible accidents.