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유리섬유 보강 플라스틱관의 휨 피로 거동에 관한 실험적 연구
장동일,고재원,Jang, Dong-Il,Go, Jae-Won 한국재료학회 1994 한국재료학회지 Vol.4 No.2
반복회수에 대한 하중-변형률 선도로부터 구산 잔류변형률의 비교 결과에서 피로하중하의 GFRP관의 강성은 GFRP관의 유리섬유의 적층수가 클수록 크게 나타났으며, 이러한 현상은 피로파괴 직전까지 나타났다. 아울러 본 피로실험 결과를 회귀분석하여 구한 S-N선도에 의하면 정적극한강도 백분율에 대한 피로강도는 GFRP관의 유리섬유 적층수가 증가할수록 증가하였으며, 유리섬유의 적층수가 15, 25, 35층인 GFRP관의 반복회수 200만회에 대한 피로강도는 정적극한강도는 각각 약 75.2%, 79.5%, 84.2%로 나타났다. In the comparison result of residual strain calculated from the load-strain curve under the repeated loading cycles, it was found that the larger the laminates is, the larger the stiffness of GFRP pipes under fatigue load is. This phenomenon is true until the fatigue failure. According to the S-N curves drawn by the regression analysis on the fatigue test results, the fatigue strength for percentage of the static ultimate strength increases by increasing the laminates of GFRP pipes. The fatigue strength for 2, 000, 000 repeated loading cycles In GFRP pipes with the laminates varing 15, 25, 35 shows 75.2%, 79.5%, 84.2% on the static ultimate strength, respectively.
전통주교(傳統舟橋)의 구조형식(構造形式)에 관한 연구(硏究) - 조선말(朝鮮末) 주교사절목(舟橋司節目)을 중심(中心)으로 -
장동일,손영식,Jang, Dong Il,Son, Young Sik 대한토목학회 1992 대한토목학회논문집 Vol.12 No.3
본 논문에서는 교량사의 한 분야로 주교(舟橋)(부교(浮橋)) 제도(制度)에 대한 사적고찰(史的考察)과 전통고유주교(傳統固有舟橋)가 어떠한 구조형식(構造形式) 인지에 대하여 중점적으로 살펴보았다. 주교제도가 완비된 조선조말(朝鮮朝末) 제 22대 정조(正租)때 주교(舟橋)을 놓기 위한 주교사(舟橋司)라는 상설기관을 설치하였는데 이 주교사에서 제정한 주교설치(舟橋設置) 절차인 주교사절목(舟橋司節目)과 이에 대한 정조의 변론(辯論)과 어제문(御製文)으로 지은 주교지남(舟橋指南)이 기록으로 전한다. 이것을 바탕으로 전통주교를 오늘날의 교양사(橋梁史) 한 부분으로 구성하여 기술사적(技術史的)인 측면에서 고찰하였다. Research into the history of a traditional bridge of boats and its style with a structure were the first consideration in this paper. When Chungjo was the 22nd king of late Chonson dynasty, a technology of the bridge of boats was already advanced and at that time an administrational office what is so called "Choukyosa" accordingly could be organized for its works. Actually we could find serval records in the historical annual concern in it. One of these is the "Choukyosagelmok" that enacted by the office for the formalties and the others are a record of king's discussion on that and a king's directions "Choukyoginam". Base on this records, this paper could study a traditional bridge of boats as a part of bridge history from a technical history point of view.
Influence of Magnesium Oxide on Carbon Dioxide Adsorption Behaviors of Mesoporous Carbons
장동일(Jang, Dong-Il),박수진(Park, Soo-Jin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
In this study, we prepared the magnesium oxide decorated ordered mesoporous carbons processed by the reduction of magnesium oxide precursor on the CMK-3 surfaces in order to investigate the characterization and the effect on their carbon dioxide adsorption behaviors. The magnesium contents of the prepared samples were characterized using XPS. The textural properties of the prepared samples were investigated by N₂/77 K adsorption isotherms by BET equation. The carbon dioxide adsorption capacities of the prepared samples were investigated by the amounts of carbon dioxide adsorptions at 298 K and 1.0 atm. The results showed that the magnesium oxide on the CMK-3 surface enhanced interaction between carbon dioxide and adsorbents. Consequently, it was found that the magnesium oxide led to an increase in the carbon dioxide adsorption capacity of the CMK-3.
Effect of Carbonization Temperature on Carbon Dioxide Adsorption Behaviors of mesoporous carbon
장동일(Jang, Dong-Il),박수진(Park, Soo-Jin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
In this study, we prepared the nitrogen-containing carbon spheres with mesopore processed by a facile polymerization-induced colloid aggregation method including carbonization in order to investigate the characterization and the effect on their carbon dioxide adsorption behaviors. The carbonization temperature was varied in the range of 600?C to 900?C. The nitrogen contents of the mesoporous carbon sphere were characterized using XPS. The carbon dioxide adsorption capacities of the prepared mesoporous carbon sphere were determined by the amounts of carbon dioxide adsorptions at 298 K and 1.0 atm. The results showed that the prepared mesoporous carbons were highly effective for the carbon dioxide adsorption due to the increasing the affinity of the basic functionalities of adsorbent surface to acidic carbon dioxide. Maximum adsorption capacities of carbon dioxide at 25?C were achieved up to 106 mg/g.
우분뇨 유래 젖소 유방염 저감을 위한 자외선 조사 살균의 효과 규명
김동혁 ( Dong Hyeok Kim ),임정주 ( Jung Ju Lim ),이진주 ( Jin Ju Lee ),장홍희 ( Hong Hee Jang ),장동일 ( Dong Il Jang ),이승주 ( Seung Joo Lee ),이후장 ( Hu Jang Lee ),민원기 ( Won Gi Min ),권순홍 ( Sun Hong Kwon ),김상훈 ( Sang H 한국환경농학회 2008 한국환경농학회지 Vol.27 No.4
Bovine mastitis is an important disease causing serious economic loss in dairy production and food poison in public health. The major causative agents of bovine mastitis include Escherichia coli (E. coli), Streptococcus agalactiae (S. agalactiae), Staphylococcus aureus (S. aureus). These bacteria were found in milk and environmental condition such as feces, water, soil and so on. Recently, many cases of mastitis are derived from environmental contamination of micro-organisms, which important factors for the spread of this disease in farm. Ultraviolet irradiation (UV) has been used as disinfection for waste and water in clinical and industrial facilities. Moreover the UV irradiation has been used as useful bactericidal agents to remove bacterial biofilms in environmental condition. In this study, we determined the bacterial replication in different percentage of water content (PWC) in sterilized saw dust and feces complexes from farm, and results showed that slightly decreased growth pattern of E. coli and S. agalactiae but increased growth pattern of S. aureus in various PWC (200, 400 and 600%) until 144 h incubation. In the bacteriocidal effect of UV irradiation to bacteria in saw dust and feces complex, the results showed that bacteriocidal effect was depended on the UV irradiation time, irradiation distance and PWC. Especially the antibacterial activity of UV irratiation is stronger in low PWC (50%), long time irradiation (50 sec), and short distance (5 cm) than other condition of this study. Furthermore UV irradiation with stirring showed increased the bactericidal effect compared without stirring. These results suggested that bovine mastitis causing agents may survive long time in environmental condition especially saw dust and feces complexes in farm and can cause a various disease including mastitis. Moreover, these data can be used as basis for application and development of UV disinfection to control of bovine mastitis from environmental contaminated bacteria in dairy farm.