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토양호흡 간이 측정기를 이용한 광미와 산림토양의 질적 평가
김성철 ( S. C. Kim ),김유범 ( Y. B. Kim ),오세진 ( S. J. Oh ),이상필 ( S. P. Lee ),주진호 ( J. H. Joo ),양재의 ( J. E. Yang ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.4
Soil respiration is a key component of the global carbon cycle but limited research has been conducted to examine the biological parameters of soil quality. Thus, The objectives of this research were to develop a simple, easy, and cost-effective standard kit to assess soil respiration and to estimate correlation between soil properties and soil respiration. For the standard kit to assess soil respiration, an ideal reactive substance was selected based on pH range. Depending on color development of the gel containing the reactive substance, soil respiration state was rated representing:<45 mg/kg/day (dark green), 45-70 mg/kg/day (green), 70-140 mg/kg/day (yellowish green), 140-300 mg/kg/day (yellow),>300 mg/kg/day (orange). Soil samples collected from two different sites (tailing and forest soils) were investigated for chemical (pH1:1, EC1:1, total organic C, and Total nitrogen, Melich 3 extractable P, and Melich 3 extratable K) and biological (Microbial C, Microbial N, Potentially mineralizable N) properties and clustered by the standard kit for soil respiration. While soil respiration level of tailings measured with kit generally ranked Group I and II representing low or moderately low soil activity, forest soils were ranked Group III and IV representing medium and ideal soil activity. Among other physicochemical properties of soil, total organic carbon (ρ=0.81) for tailing and EC1:1 (ρ=0.87) for forest soil were the most correlated parameters with soil respiration. Within biological properties, Microbial mass C (ρ=0.86 for tailing and ρ=0.80 for forest soil) showed the most correlated parameter with soil respiration. Overall, soil respiration assessment kit might have a potential to be used as a tool for quality assessment of soil biological indicators.
이진경(J.K. Lee),이상필(S.P. Lee),이준현(J.H. Lee),손인수(I.S. Son),배동수(D.S. Bae) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A carbon steel(A53) in this study is used as material of pipe in marine plant and ship industry. An weld to connect carbon steels is necessary and an effect of weld on properties of carbon steel has been completed by many researchers. In this study, dynamic behavior of welded carbon steel is studied by acoustic emission(AE) technique, one of nondestructive tests. There are lots of AE parameters to analyze the damage behavior of carbon steel by external loading. AE parameters of energy, cumulative count, amplitude and AE event were used, and each parameter was differentiated according to the damage degree of carbon steel. Energy showed high level at elastic range of load curve, while amplitude was the highest value at the hardening region. Cumulative count showed similar growth tendency with loading curve. In addition, ultrasonic technique and hardness test were applied to evaluate the mechanical properties according to the base zone, HAZ region and weld zone of the weld specimen. The velocity and attenuation ratio showed a little of change according to the each zones, and the evaluation of ultrasonic wave on the each zone of the specimen was an useful method to clarify the mechanical properties of the carbon steel.
핵융합로용 저 방사화 페라이트강(JLF-1)의 피로균열진전 거동
윤한기(H.K. Yoon),이상필(S.P. Lee),공유식(Y.S. Kong),김사웅(S.W. Kim),박원조(W.J. Park),A.Kohyama(A. Kohyama) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The objective of this study is to investigate fatigue life and fatigue crack propagation behavior in the Reduced Activation Ferritic Steel (RAFs) JLF-I. The experiment of fatigue life for JLF-I steel have been carried out for the stress ratio R=0 at room temperature. The fatigue crack propagation behavior of the JLF-I steel was investigated by the constant-amplitude loading test for the stress ratios R=0.1, 0.3 and 0.5 respectively. The effects of stress ratios and specimen size on the fatigue crack growth behaviors for JLF-I steel were discussed within the Paris law. At room temperature, the fatigue limits of longitudinal and transverse direction to the rolling direction were 470 MPa and 490 MPa at 1X 10_7<br/> cycles. respectively. The base material of JLF-I steel showed the isotropic behavior in fatigue properties of the rolling direction and the test temperature. The fatigue crack propagation rate of a half size specimen was similar to that of a full size specimen at the stress ratios of 0.1, 0.3 and 0.5 respectively. The fatigue crack propagation behavior of this material was evaluated by using a half size specimen.
저방사화 철강재료 (JLF-1)/STS304 이종재 마찰용접의 인장강도특성
박이현(Y. H. Park),김재웅(J. W. Kim),공유식(Y. S. Kong),이진경(J. K. Lee),이상필(S. P. Lee),윤한기(H. K. Yoon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
Development of reliable joints between JLF-1 steel and stainless steels are required. As known, different methods for joining various materials are assumed to be used for the construction of International Thermonuclear Experimental Reactor first wall, blanket, divertor and reactor vessel. Recently, joints technology development of JLF-1 steel (Fe-9Cr-2W-V-Ta) and Stainless steel(STS304) have been investigated for diffusion bonding, brazing, roll bonding, explosive bonding and hot isostatic pressing. On the other hand, a friction welding is one of the most popular welding method for joining between different materials such as a tube. Not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld quality evaluation technique by acoustic emission for dissimilar friction welding of nuclear reactor component(JLF-1 and STS304) were carried out.
핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성 K<SUB>IC</SUB> 평가
김동현(D. H. Kim),윤한기(H. K. Yoon),이상필(S. P. Lee),공유식(Y. S. Kong),A. Kohyama 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
A reduced activation ferritic steel (JLF-1) has been developed for a candidate of structural materials in nuclear fusion reactor applications. The tensile properties and fracture toughness (K<SUB>IC</SUB>) of the JLF-1 steel were evaluated from the variation of temperature and rolling direction. From experimental results, it was found that the tensile properties and fracture toughness of JLF-1 steel showed the isotropy in the rolling direction. However, The result of test at room temperature showed higher strength and fracture toughness than test at high temperature(400℃).
저방사화 철강재 의 시험편 크기 변화에 따른 (JLF-1) 파괴저항곡선의 변화
김동현(D.H.Kim),윤한기(H.K.Yoon),이상필(S.P.Lee),A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Reduced activation ferritic steel (JLF-1) is considered as a promising candidate material for blanket<br/> or first-wall structure of D-T fusion reactors. The fracture tests of fracture resistance curve (J-R curve)<br/> and JIC are desirable to investigate the exact fracture toughness of JLF-1 steel, since it has a high<br/> ductility. The fracture toughness of JLF-1 steel is affected by the configuration of test specimen such<br/> side groove, specimen thickness or specimen size. In this study, the fracture toughness tests were<br/> performed with various size(plane size and thickness) and various side groove of specimens. The test<br/> results showed the standard specimen with the side groove of 40 % represented a valid fracture<br/> toughness. The fracture resistance curve increased with increasing plane size and decreased with<br/> increasing thickness. However, the fracture resistance curve of half size specimen was similar to that of<br/> the standard specimen.
핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성
윤한기(H.K.Yoon),김동현(D.H.Kim),이상필(S.P.Lee),박이현(Y.H.Park),공유식(Y.S.Kong),Y.Katoh,A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate<br/> materials for fusion reactor applications. Fracture toughness (JIC) and tensile tests were carried out at<br/> room temperature and elevated temperature (400 ℃). Two types of CT specimen were prepared to<br/> examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile<br/> specimen were also prepared to investigate the property by the rolling direction and welding. The<br/> Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of<br/> JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed<br/> by scanning electron microscopy (SEM).