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Fe-Ni-Co 저열팽창성 합금의 고온 변형 특성 및 열간가공에 따른 열팽창 거동 연구
이기안,박종혁,조봉현,남궁정,김문철 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9
The high temperature deformation behavior and the effect of hot compression on the thermal expansion behavior of Fe-29Ni-17Co low thermal expansion Kovar alloy were investigated in the compressive temperature range of 900~1300℃ at the strain rate range of 25~0.01 sec.^(-1). The temperature (T) and strain rate (ε˙) dependence of the flow stress (σ_(0.7)) could be well described by hyperbolic sine law as ε˙= A [sinh(0.0084 σ)^(5.2018)] exp(-330.41/RT). Surface hot cracking and significant voids around grain boundary could be found at low temperature below 1000℃ and low strain rate (0.01 sec.^(-1)). Thermal expansion coefficient α_(30~400) generally increased with increasing compressive temperature. Moreover, α_(30~400) remarkably increased as strain rate decreased at high temperature above 1100℃. However the thermal expansion coefficient α_(30~400) of low compressive temperatures (900℃ and 1000℃) anomalously increased especially at high strain rates. Experimental results indicated that not only α phase appearance but also grain size had definite influence on the thermal expansion behavior with hot deformation. The correlation between microstructure and thermal expansion behavior of Kovar alloy were also discussed.
Mun, Hueong-Tae,Namgung, Jeong,Namgung, Jeong-Hee-Namgung The Ecological Society of Korea 2000 Journal of Ecology and Environment Vol.23 No.2
Mass loss and changes of mineral nutrients during decomposition of Phragmites communis for 13 months from November 1998 to December 1999, were investigated at the fringe of stream at Boryeong, Chungnam Province in Korea. Plant materials, which were collected in November 1998. were divided into leaves, culms and rhizomes. Litterbags, 15${\times}$15 cm, were made of nylon mesh with 2-mm$^2$ holes. At 13 months after installation, remaining mass of leaves, culms and rhizomes was 29.0%, 57.4%, 20.6%, respectively. Mass loss rate of the culms was significantly lower than those of the leaves and rhizomes. The decay rate of leaves, culms and rhizomes was 1.21. 0.42 and 1.48 per year, respectively. Initial concentration of N, P, K, Ca and Mg of leaves. culms and rhizomes was 22.5, 9.0, 15.5 mg/g for N, 0.34. 0.10, 0.33 mg/g for P, 15.0, 12.5. 12.3 mg/g for K, 2.84. 0.80, 0.03 mg/g for Ca. 1.94. 0.97, 0.40 mg/g for Mg, respectively. Concentrations of nutrients were higher in leaves than in culms and rhizomes. Except for N and Mg in rhizomes, there was no immobilization period during the decomposition. In the case of remaining K and Ca, most are lost during the first 3 months. Without any suitable method for removal of dead part, eutrophication of freshwater may be accelerated by dead macrophytes.
Weight Loss and Nutrients Dynamics during the Decomposition of Fine Roots
Mun, Hyeong-Tae,Pyo, Jae-Hoon,Shin, Chang-Hwan,Namgung, Jeong,Kim, Jeong-Hee The Ecological Society of Korea 2002 Journal of Ecology and Environment Vol.25 No.1
Weight loss, N and P dynamics during decomposition of fine roots (<2mm) of alder(Alnus japonica), oak (Quercus acutissima) and pitch pine(Pinus rigida) were studied for 33 months in Kongju, Korea. After 33 months, remaining weight of fine roots of alder, oak and pitch pine was 29.2%, 47.7% and 53.4% of the initial weight, respectively. The decomposition rate constant (k) for alder, oak and pitch pine was 0.448 $yr^1$, 0.269 $yr^1$, 0.228 $yr^1$, respectively. Initial concentration of N and P in fine roots was 10.32mg/g and 0.69mg/g for alder, 6.20mg/g and 0.37mg/g for oak and 7.26mg/g and 0.44mg/g for pitch pine, respectively. Initial concentration of N and P in alder were higher than those in oak and pitch pine. After 33 months, remaining N and P in fine roots was 39.5$\%$ and 31.8$\%$ for alder, 59.4$\%$ and 57.8$\%$ for oak, 63.0$\%$ and 83.4$\%$ for pitch pine, respectively. Decomposition rate and the rate of N released from decomposing fine roots was positively correlated with the initial N concentration of the fine roots.
NamGung, Jeong,Han, A-Reum,Mun, Hyeong-Tae The Ecological Society of Korea 2008 Journal of Ecology and Environment Vol.31 No.4
Weight loss and nutrient dynamics of oak and pine leaf litter during decomposition were investigated from December 2005 through June 2008 at Mt. Worak National Park as a part of National Long-Term Ecological Research Program in Korea. The decay constant (k) of oak and pine leaf litter were 0.314 and 0.217, respectively. After 30 months decomposition, remaining weight of oak and pine leaf litter was 45.5% and 58.1%, respectively. Initial C/N ratio of oak and pine leaf litter was 53.4 and 153.0, respectively. Carbon % of initial oak and pine leaf litter was similar with each other; however, nitrogen content of initial oak leaf litter (0.85%) was greater than that of initial pine leaf litter (0.33%). N and P concentration in both decomposing leaf litter increased significantly during decomposition. There was no net N and P mineralization period in decomposing pine leaf litter. K, Ca and Mg concentration in both decomposing leaf litter showed different pattern with those of N and P. After 30 months decomposition, remaining nutrients in oak and pine leaf litter were 97.7 and 216.2% for N, 123.2 and 216.5% for P, 39.3 and 44.8% for K, 47.9 and 40.6% for Ca, 30.7 and 51.2% for Mg, respectively.
남궁문,NamGung, Mun 한국대학교육협의회 2010 大學敎育 Vol.163 No.-
국가경쟁력 강화를 위해 5+2권역으로 설정된 광역경제권별 선도산업을 이끌어 갈 인재양성을 위한 중심대학을 선정하여 광역과 지역의 발전을 도모하기 위해 수립된 "광역경제권 선도산업 인재양성센터" 사업에 전국 20개 대학이 선정되어 운영되고 있다. 이에 광역경제권 선도산업의 사업기획 배경과 프로그램의 핵심적인 내용 등을 소개함으로써 대학의 향후 교육방향과 더불어 선도산업 인재양성센터의 사업성과를 극대화 시키는데 기여하고자 한다.
증식당뇨망막병증의 유리체절제술시 지혈을 위한 피브린접착제 주입
남궁문,박종석,Mun NamGung,Jong-Seok Park 대한안과학회 2005 대한안과학회지 Vol.46 No.6
Purpose: To study the effectiveness of fibrin sealant to control intraoperative bleeding during pars plana vitrectomy of proliferative diabetic retinopathy. Methods: Intravitreal fibrin sealant was applied to 100 eyes of proliferative diabetic retinopathy patients prospectively. Preoperative fundus finding included longstanding vitreous hemmorrhages, preretinal macular hemorrhages and tractional retinal detachments. The male vs female ratio was 38:52,and the mean age was 62.4 years. Panretinal laser photocoagulation was done in all patients preoperatively. Results: In all of 100 (100%) eyes, intraoperative bleeding was controled. Intraoperative complication consisted overinjection of fibrin sealant in 2 eyes. Postoperative complications comprised transient IOP elevation in 20 eyes, mild epiretinal membrane in 1 eye,and delayed absorption of fibrin sealant in 1 eye. Average absorption time of fibrin sealant was 21±1.3 days. Conclusions: Fibrin sealant is an effective and safe tool to control intraoperative bleeding during pars plana vitrectomy.
보문 : 월악산 소나무림의 낙엽생산과 낙엽을 통한 영양염류 이입량
남궁정 ( Jeong Namgung ),문형태 ( Hyeong Tae Mun ) 한국환경생물학회 2009 환경생물 : 환경생물학회지 Vol.27 No.3
월악산 국립공원 내의 소나무군락에서 2005년 5월부터 2008년 4월까지 3년 동안 월별 낙엽의 생산량과 낙엽을 통해 임상에 이입되는 영양염류의 양을 조사하였다. 2005, 2006, 2007년의 낙엽생산량은 각각 3.070, 3.066, 3.099 ton ha-1 yr-1이었으며, 3년 동안의 평균 낙엽생산량은 3.078±0.018 ton ha-1 yr-1이었다. 낙엽 구성원 중 침엽, 가지 및 수피, 생식기관 그리고 기타가 차지하는 비율은 각각 61.9, 10.4, 5.2, 22.5%으로 침엽이 차지하는 비율이 가장 컷다. 조사지소에서 3년 동안 낙엽을 통해 임상에 이입되는 질소, 인, 칼륨, 칼슘 그리고 마그네슘의 평균 양은 18.014, 0.878, 4.240, 7.349 그리고 2.172 kg ha-1 yr-1이었다. Litter production, nutrient concentration of each component of litterfall and amount of nutrients input to forest floor via litterfall were investigated for three years from May 2005 through April 2008 in Pinus densiflora forest at Mt. Worak National Park. Amount of litterfall in 2005, 2006, 2007 were 3.070, 3.066, 3.099 ton ha-1 yr-1, respectively. Average amount of litterfall for three years was 3.078±0.018 ton ha-1 yr-1. Average percentage of leaf litter, branch and bark, reproductive organ and the miscellaneous for three years were 61.9, 10.4, 5.2, 22.5%, respectively. Average amount of N, P, K, Ca and Mg returned to forest floor via litterfall for three years in this P. densiflora forest were 18.014, 0.878, 4.240, 7.349 and 2.172 kg ha-1 yr-1, respectively.