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1930-40년대 부산·경상지역의 근대 역사문화유산에 사용된 강재의 재료적 특성
안재철,송종목,Ahn, Jae-Cheol,Song, Jong-Mok 한국건축역사학회 2014 건축역사연구 Vol.23 No.6
In this study, we evaluated the chemical and physical properties of structural steel, which is the most basic material for steel structures and reinforcement concrete structures in modern period. We theorized the technical data for the research of technical history of modern heritage structures by analyzing the product system and its quality control of structural steel used in modern historical heritages. The results of this study are as follow; first, the rounded bars were used in most of modern heritage structures. But in the case of Waegwan railroad bridge, the deformed bars were used in spit of not using in Japan after the great earthquake of Kantou. Second, the structural steel was good in terms of quality control, but It has brittle properties because it was not manufactured by heat treatment process.
초음파 전파속도법을 이용한 목조 문화유산 흰개미 피해의 정량 평가
안재철,Ahn, Jae-Cheol 한국건축역사학회 2015 건축역사연구 Vol.24 No.5
Quantitative analysis of termites damage is important in terms of conservation and maintenance of wooden cultural heritage buildings, because termites makes cavities and decreases the section area of wooden structural members. The purpose of this study is to forecast the range and spread of termites damage in the wooden structural members by using ultrasonic pulse velocity method. Ultrasonic pulse velocity has been used as one of non-destructive test to analysis the internal defect by using difference velocity between medium material and cavity. This method would be effective to analysis termites damages. From the result of the ultrasonic velocity test, the loss rate of area effected by termites damage had a strong correlation with ultrasonic velocity. And it is possible to predict the loss rate of area from by termites damage by using regression equation in the case of structural member of fine tree.
廢 EPS 再生骨材의 空隙構造와 輕量骨材콘크리트의 斷熱性能
안재철(Ahn Jae-Cheol) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
This study is to investigate the insulation performance of lightweight concrete using recycled lightweight aggregate, and to develop lightweight concrete products which have an excellence on the insulation performance satisfying with properties of building materials. As a result of this study, recycled EPS aggregate is considered to have an independent pores which is closed by dense partitions. So, it is showed that the insulation performance of lightweight concrete using recycled EPS aggregate is excellent. Especially, in the case of lightweight concrete under conditions of replacement ratio over 100%, it is considered that insulation performance is very excellent as thermal conductivity is showed about 0.2㎉/mh℃. Considering the relation between ultrasonic pulse velocity and unit weight & thermal conductivity through the graph, the result of relation between ultrasonic pulse velocity and unit weight & thermal conductivity on the graph expressed their high interaction shown as direct proportion on the graph. Therefore, it is possible to extract the insulation performance of lightweight concrete using recycled EPS aggregate by ultrasonic pulse velocity and unit weight.
우암동 소막사주택의 피란기 변용과정에서 브리꼴라쥬 특성 - 피란기 건축재료의 수급 과정을 중심으로 -
안재철(Ahn, Jae-Cheol) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.2
This study aims to chronologically cover the bricolage characteristics of the initial construction of cowshed housing in Uam-dong, the transformation process and developmental changes during the Korean War evacuation period and the social recovery following the Korean War Armistice Agreement. The collapse of the construction industry during this period heavily impacted how specific materials were obtained by refugees, which directly affected how homes were then structurally built. Upon analysis, it was revealed that due to the collapse of the architectural ecosystem in the early stages of evacuation, most materials used were locally gathered within a residential area; these materials included duvets, straw bags, along with wood and soil from the mountains behind villages. Other materials were gathered or by-products were purchased from a nearby American army base and along the Uam railway line. These pertinent details help unveil how building materials were supplied for bricolage amid the social system being disrupted during the Korean War evacuation period.
안재철(Ahn, Jae-Cheol) 大韓建築學會 2017 大韓建築學會論文集 : 構造系 Vol.33 No.10
The Cow-shed housing was built as a cow-shed, which was the site of exploitation of Japanese colonial era, and after that, it began to be used as evacuation housing by the refugees at the time of the Korean war. Also, cow-shed housing has important historical value as the background of modern korean history, such as being used as a residence space for low-income urban workers during economic growth. In this process, wooden structural columns were cut or replaced for spatial efficiency. In the long run, the structure of this building is characterized by a complex structure because part of the wooden structure has been replaced by a masonry wall. Also in the roof structure, many structural members have been cut and used for the efficiency of the attic space. These structural changes are quite absurd in the structural aspect. But these architectural activities were valuable in terms of life history in that they were carried out in a limited and special environment by refugees who are nontechnical architects in accordance with the spatial demands of evacuation life at the time.
폐콘크리트 미분말과 산업부산물을 이용한 저온 소성 재생시멘트의 물성
안재철(Ahn, Jae-Cheol),박동천(Park, Dong-Cheon) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.3
The study for using as recycle the cementitious powder consisting among the waste concrete, which accounts for more than 60%, could be achieved by authors. However, many practical problems that the lack of compressive strength due to internal fine aggregate and becoming free lime due to imbalance of raw chemical ingredient remain. In this study, promote a high quality of play cement with cementitious powder from waste concrete, blast furnace slag and fly ash as sub material to development recycled cement in the way of 700℃ low-temperature heating. As a result, the fluidity test of recycled mortar using recycled cement, the composition of recycled cement to slaking by CaO greatly reduced by sub material added result in increased liquidity. And also, recycled cement with blast furnace slag as sub material is more superior in improvement of compressive strength than without adding cement.
철계 서셉터를 혼입한 시멘트 물질의 마이크로파 가열시 승온특성의 박막의존성
안재철(Ahn Jae-Cheol),김용경(Kim Yong-Kyoung),이성진(Lee Sung-Jin) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.2
This study aimed for the development of the cementitious joint with easy-disassembly and attempted the design for disassembly that used mechanism of the microwave heating. The purpose of this study is to choose a susceptor, which helps raise the heating efficiency with microwave heating, and to evaluate heating effectiveness with microwave heating by analysis of the temperature elevation characteristics. As a result of this study, excellent temperature elevation characteristics is showed by using ferric material as susceptor of cementitious modifier considering the heating efficiency of microwave heating. In addition, iron oxide powder shows the heating efficiency of microwave better than pure iron powder. For that reason, iron oxide powder is very suitable as susceptor for cementitious modifier. The cementitious modifier which used iron oxide powder was able to reach in the temperature that is possible of the fragility of the cementitious material by microwave heating, less than 30 seconds at 700W and 20 seconds at 1800W in the case of S/B1.0, thickness 1mm in oven dry condition.
안재철(Jae-Cheol Ahn),오일석(Il-Seok Oh) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1B
이 논문은 OCR(Optical Character Reader)로 인식된 한글 문서에서의 오인식 경향을 분석하고, 이를 이용한 한글 단어 검색 방법을 제안한다. OCR로 인식된 많은 양의 한글 문서를 기반으로 자모별 인식 빈도수를 계산하고 이를 바탕으로 초성, 중성, 종성별 인식 혼동 행렬(confusion matrix)을 구성하였다. 또한 인식 정보를 적절히 이용하기 Bayes 정리를 이용하였다. 질의어에 대한 오인식 단어의 검색 방법을 제시하고 혼동 행렬과 이 검색 방법을 바탕으로 OCR 기반 단어 검색 시스템을 구축하였다.