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제강슬래그와 CaO를 이용한 폐광산 주변 중금속 오염 농경지 토양의 안정화 처리 연구
손정호,노훈,이선영,김성규,김길홍,박중규,양재규,장윤영,Son, Jung-Ho,Roh, Hoon,Lee, Sun-Young,Kim, Sung-Kyu,Kim, Gil-Hong,Park, Joong-Kyu,Yang, Jae-Kyu,Chang, Yoon-Young 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.6
비소 및 여러 양이온 중금속으로 오염된 풍정광산 주변 밭토양 및 논토양의 안정화처리를 위해 CaO 및 제강슬래그를 여러 혼합비로 사용하였을 때의 적용성을 회분식 및 컬럼반응기를 이용하여 연구하였다. TCLP 용출시험법을 이용하여 안정화제 처리 전후의 중금속 고정화도 변화를 평가하였다. 안정화제로 제강슬래그만 사용한 경우에는 비소 및 양이온 중금속 모두에서 고정화도가 15% 이하로서 높지 않았다. 이러한 것은 제강슬래그 주요 성분인 $Fe_2O_3$와 $SiO_2$에 의한 중금속들의 안정화효과가 크지 않은 것과 제강슬래그 자체에 함유된 CaO에 의한 토양 pH 상승효과가 용출실험에 사용한 TCLP 용액의 산성도에 의해 상쇄된 것에 기인하여 나타난 것으로 여겨진다. CaO와 제강슬래그를 함께 사용한 경우에는 주입비율의 차이에 따른 양이온 중금속 제거율은 큰 변화가 없었으나 제강슬래그의 비를 높여 줄수록 비소의 제거율의 증가를 가져왔다. 컬럼실험에서도 CaO와 제강슬래그를 함께 주입한 경우 비소 및 양이온 중금속들의 용출농도는 처리기간 동안 수질배출허용 기준이하로 나왔다. 이것은 양이온 중금속의 경우 CaO 사용에 따른 pH 증가함에 따른 중금속의 고정화, 비소의 경우는 CaO에서 유리된 $Ca^{2+}$와 $AsO_4^{3-}$와의 반응에 의해서 생성되는 난용성의 $Ca_3(AsO_4)_2$가 생성되는 것에 기인한 결과로 판단된다. 비소 및 양이온 중금속이 함께 오염된 토양의 안정화에 CaO와 제강슬래그를 함께 주입할 경우 복합오염물질을 효과적으로 안정화처리가 가능함을 알 수 있었다. Applicability of CaO and steel slag as stabilizers in the treatment of field and paddy soils near Pungjeong mine contaminated with arsenic and cationic heavy metals was investigated from batch and column experiments. Immobilization of heavy metals was evaluated by TCLP dissolution test. Immobility of heavy metal ions was less than 15% when steel slag alone was used. This result suggests that $Fe_2O_3$ and $SiO_2$, known as the major component of steel slag, have little effect for the immobilization of heavy metal ions due to acidity of TCLP solution. Immobilization of cationic heavy metals was little affected by the ratio of CaO and steel slag while arsenic removal was increased as the ratio of steel slag to CaO increased. In the column test, concentrations of both arsenic and cationic heavy metals in effluents were below the water discharge guideline over the entire reaction period. This result can be explained by the immobilization of cationic heavy metals from the increased pH in soil solution as well as by the formation of insoluble $Ca_3(AsO_4)_2$. From this work, it is possible to suggest that arsenic and cationic heavy metals can be concurrently stabilized by application of both CaO and steel slag.
손정호(Jung-Ho Son),김병주(Byung-Joo Kim),박진수(Jinsoo Park) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
This paper presents the procedure and results of the structural analysis for the connecting rod of a medium-size marine diesel engine. Press fitting of bearing shells at the big end and shrink fitting of bearing bush at the small end have been simulated including the fully mechanical contact between the neighboring components such as big end upper, big end lower, and conrod shaft. According to the fabrication procedure of the connecting rod, FE analysis have been performed.<br/> At the initial design stage of connecting rod, FE analysis presents the comprehensive understanding for structural behavior and information for validation of design parameter. It was confirmed that fatigue strength of the connecting rod was sufficient and each design parameter was within the allowable level.<br/>
손정호(Jung Ho Son),이종환(Jong Hwan Lee),이준호(Jun Ho Lee),김종만(Jong Man Kim),주호진(Ho Jin Joo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A fully-floating type of a piston pin is mainly used in the heavy duty marine diesel engine that has a maximum firing pressure over 180 bar. In the structural and fatigue analysis of the piston pin, it is necessary to understand the fully-floating structural behavior that results from rotating randomly. Based on the assumption of no rotation, the maximum and minimum stress is calculated including the shrink-fitting. According to FKM Guideline, the fatigue analysis of the piston pin was carried out and the effect of case-hardening on fatigue strength was investigated
손정호 ( Son Jung Ho ),박승우 ( Park Seung Woo ),강민구 ( Kang Min Goo ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
The purpose of this study was to estimate of soil loss form hillslope using WEPP(Water Erosion Prediction Project) model. WEPP model was developed for predicting soil erosion and deposition, fundamentally based on soil erosion prediction technology. The model for predicting sediment yields from single storms was applied to a tested watershed. Surface runoff is calculated by kinematic wave equation and infiltration is based on the Green and Ampt equation. Governing equations for sediment continuity, detachment, deposition, shear stress in rills, and transport capacity are presented. Tested watershed has an area of O.6ha, where the runoff and sediment data were collected. The relative error between predicted and measured runoff was -16.6 ~ 2.2 %, peak runoff was -15.6 ~ 2.2% and soil loss was -23.9~356.5%.
손정호(Jung-Ho Son),이종환(Jong-Hwan Lee),김원현(Won-Hyun Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Moving parts of the rotating and reciprocating mechanism are the most important components of the diesel engines and require very high reliability in their design. Especially the crankshaft, the key component of running gear (powertrain), is subject to complicated loadings such as bending, shear and torsion coming from firing pressure, inertia forces and torsional vibration of crankshaft system. Intrinsically they show different cyclic patterns of loading in both direction and magnitude, and thus ordinary approach of proportional loading is less valid to analyze the dynamic structural behavior of crankshaft. In this paper, new fatigue analysis method is introduced to analyze and design the crankshaft of a medium-speed diesel engine in order to consider the non-proportional multi-axial loads realistically as well as to present the general fatigue analysis approach for an engine crankshaft.
손정호(Jung Ho Son),하만영(Man Yeong Ha),안성찬(Sung Chan Ahn),최성욱(Seong Wook Choi) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.5
180 bar 이상의 최대 폭발압과 높은 열부하를 가진 박용 디젤엔진의 분리형 피스톤은 크라운과 스커트를 각각 고강도 합금강과 연성주철을 사용한다. 피스톤의 피로설계를 위해서는 작용 하중, 표면조도 뿐만 아니라 온도영향에 의한 강도 저하를 고려해야 하며, 실린더 내부의 폭발력이 크라운을 거쳐 스커트에 전달되는 하중의 분율도 고려되어야 한다. 본 연구에서는 노치부의 피로강도 증분을 응력구배방법을 사용하여 고려하였으며, 열전달해석과 그에 따른 온도영향을 고려하였다. 하중 분율과 접촉압력은 공차해석을 통해 최적화하였으며, 프로타입 엔진에 대한 실차 시험을 통해 냉각 및 내구설계를 검증하였다. A composite piston with a crown made of steel and a skirt made of NCI is used in a marine diesel engine, which has a maximum firing pressure of over 180 bar and a high thermal load. In the fatigue design of the composite piston, the fatigue is influenced by factors such as the load type, surface roughness, and temperature; further, the distribution ratio of the firing force from the crown to the skirt is important for optimizing the design of the crown and skirt. In this study, the stress gradient method was used to consider the effect of the load type. The temperature field on the piston was predicted by cocktail-shaking cooling analysis, and influence of high temperature on fatigue strength was investigated. The load transfer ratio and contact pressure were optimized by design of the surface shape and accurate tolerance analysis. Finally, the cooling performance and durability design of the composite piston were verified by performing a long-term prototype test.
손정호(Son, Jung-Ho),강만구(Kang, Man-Gu),류광선(Ryu, Kwang Sun),장순호(Chang, Soon Ho),박남규(Park, Nam-Gyu) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Synthesis of TiO₂ nanoparticle paste is one of the important technologies in dye-sensitized solar cells (DSSC). Performances of the DSSCs from synthesized TiO₂ nanoparticle paste was similar or better than those from commercial sources. In addition. cell efficiency was further improved by using large scattering TiO₂ particles. Those results was utilized in manufacturing high efficiency DSSC modules.