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小流域 森林의 水收支에 관한 硏究(Ⅱ) : 降雨强度에 의한 流出을 중심으로 with Run-off by Rainfall Intensity
李賢揆 尙志大學校 1997 論文集 Vol.18 No.-
This study was carried out to investigate the water ballance of small catchment (0.51ha) at Wonju Korea. The term of investigate is 1996.4-1996.10 and the item of investigate are the moisture content in soil layer, the Rainfall under tree crown, the Run-off. The results are as follows: 1. The mean of moisture content in forest soil layer is 16.3%, the mean of moisture content in humus layer is 52.8%. and the mean of moisture content in litter layer is 39.6%. 2. The lowest moisture content(1996.5.27-5.30) shows that the moisture content in forest soil layer is 12.8%, moisture content in humus layer is 22.3%, and moisture content in litter layer is 14.5%. 3. The highest moisture content(1996.7.27-7.30) shows that the moisture content in forest soil layer is 18.9%, moisture content in Humus layer is 63.7%, and moisture content in litter layer is 67.8%. 4. The mean of Through fall is 73.8%, and the mean of Stem flow is 2.25%. Through fall of Larix stand is 74.0% and Pinus stand is 73.6%. Stem flow of Larix stand is 2.68% and Pinus stand is 1.83% 5. The rate of Consumtive use is 0.92. the gross pricipitation in forest watershed is 714.3㎥ and the total Run-off is 53.2㎥(1996.7.19-8.2).
李賢揆 尙志大學校 1998 論文集 Vol.19 No.-
Most denuded mountain-areas in Korea were completely stabilized by the successful work of the 1st and 2nd 10=years Forest Development plans which targeted the reforestation of denuded forest lands(the total area of denuded forest land was 680 thousand ha in the 1950s). The objectives of this peper are (1) to estimate the depth of organic horizon in the soil profile, (2) to investigate the change of vegetation structure, (3) to estimate the change of biomass in the erosion controlled and rehabilitated mountain areas with the passage of time. This study was carried out as the third times. The first study began in 1985 year, the second study was in 1988, the third study was in 1992 year. When the first study started, the sites have elapsed 3 years (site I), 5 years(siteII), 7 years(site III), 9 years(siteIV) after erosion controlled work. The results of the study were as follows : The change of organic horizon thickness was 5 cm, during 16 years after erosion control work. The Al horizon come out after 16 years. Change of vegetation structure on upper plant layer: R.C of Robinia Puseudoacacia gradually increase, R.C, of Quercus spp. continuously incress. On the whole, the young growths of Alnus spp, have not appear on the soil surface. Biomass of herb have not almost appear all the site after 10years. On 16 years, dry weight of vegetation in erosion controlled area was 62.5t/ha.
경계요소법에 의한 이종재료 접합면에 수직인 균열의 해석
임원균,이현규 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
In the particular situations where the crack is terminated at an interface of two materials, the order of stress singularity depends on the elastic constants which specify the properties of two materials. A multidomain boundary element technique is used to solve a crack normal to bimaterial interface. A correct order of shape function is used for displacement by using the isoparametric elements by shifting adequately the side nodes adjacent to this crack tip. A shape function containing the same order of singularity as that in the interface crack is also used for the interpolation of traction. Numerical testing of a bimaterial with a crack normal to the interface is carried out with three-node elements. The results obtained are compared with the previous solutions.
이현규,이정남,류승덕,강주희,차영남,박창신 대한약리학회 2004 The Korean Journal of Physiology & Pharmacology Vol.8 No.4
Primary fish-odor syndrome (FOS) is a genetic disorder caused by defective flavin-containing monooxygenase 3 gene (FMO3) with deficient N-oxidation of trimethylamine (TMA), causing trimethylaminuria (TMAU). By contrast, secondary FOS can be acquired by decreased FMO activities in patients with chronic liver diseases, but the underlying mechanisms are unknown. In the present study, we examined plasma NOx concentrations and viral DNA contents as well as in vivo FMO activities and their correlations in chronic viral hepatitis (CVH) patients. Plasma concentration of NOx was significantly increased by 2.1 fold (56.2±26.5 vs. 26.6±5.4μM, p<0.01), and it was positively correlated with plasma hepatitis B virus (HBV) DNA contents (r2=0.2838, p=0.0107). Furthermore, the elevated plasma NOx values were inversely and significantly correlated with in vivo FMO activities detected by ranitidine-challenged test (8.3% vs. 20.0%, r2=0.2109, p=0.0315). TMA N-oxidation activities determined in CVH patients without challenge test were also significantly low (73.6% vs. 95.7%, p<0.05). In conclusion, these results suggested that secondary FOS could be acquired by the endogenously elevated NO in patients with CVH.
용탕교반법에 의한 $Al_2O_{3(p)}$/LXA복합재료의 기계적 성질에 관한 연구
이현규,공창덕 한국추진공학회 2000 한국추진공학회지 Vol.4 No.1
금속기지 복합재료의 주조는 폭넓은 재료의 선택과 공정조건들을 제공하는 좋은 공정이다. 용탕교반기술은 압착주조 또는 분말야금과 비교하면 매우 간단하고 값이 싸기 때문에 주조방법중에서 산업응용에 가장 널리 쓰이는 좋은 방법이다. 최근에는 $\alpha$ -$Al_2O_{3(p)}$/Lo-Ex alloy 복합재료의 입자크기, 입자의 부피 분율, 기계적 성질에 있어서 Mg첨가 그리고 열팽창계수 등이 연구되어 왔다. $\alpha$ -$Al_2O_3$는 입자계면과 기지에 형성되어 기계적 성질에 중요한 역할을 하였다 대부분 복합재료의 인장강도는 증가하지 않지만 16$\mu\textrm{m}$ $\alpha$ -$Al_2O_3$ 입자를 5vol%로 첨가한 경우, 3wt.% Mg를 첨가한 복합재료의 인장강도는 증가한다. 강화재의 부피분율과 mg은 복합재료의 열팽창계수를 감소시켰다. Casting of metal matrix composites is an attractive process since it offers a wide selection of materials and processing conditions. Among the casting methods, melt-stirring technology is much attractive route in industrial application because it is more simple and inexpensive compared to squeeze casting or powder metallurgy. In the present work, effects of particle size, volume fraction of particles and mg addition on mechanical properties and thermal expansion coefficients of $\alpha$ -$Al_2O_{3(p)}$/LXA composites were studied. It is shown that $\alpha$ -$Al_2O_3$ particles formed at the interface of $\alpha$ -$Al_2O_3$ particles and matrix made an important role on mechanical properties. Ultimate tensile strength of most composite materials was not increased. But in the case of 5vol% addition of 16$\mu\textrm{m}$ $\alpha$ -$Al_2O_3$ Particle, Ultimate tensile strength of composite materials with 3wt.% Mg was increased. Volume fraction of reinforcements and mg content were thermal expansion coefficients of composite materials were decreased.