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김지문,한창열 한국임학회 1963 한국산림과학회지 Vol.3 No.1
Present experiment has been carried out in order to make clear the abnormalities of the female gametophyte formation and its relation to fertility, using the short-style of F. koreana, the results of which are summarized as follows : (1) Anatropous ovule has single integument with thick cell-layer and tiny nucellus consisting of nucellaepidermis and megaspore mother cell. (2) Meiotic division of megaspore mother cell takes place around middle or latter part of March, while that of microspore mother cell occurs from the end of September to the beginning of October. (3) Megaspore mother cell stage is long, and ranges from October to March next year. (4) Formation of mature embryo sac is not completed until the beginning of May, approximately one month after bicoming. (5) Normal embryo sac is rare, most of the nucellus being devoid of embryo sac.
Pinus rigida × taeda 침엽내 양료수준의 (養料水準) 변이에 관한 몇가지 요인의 영향
김지문,권기원,송호경,김정석 ( Chi Moon Kim,Ki Won Kwon,Ho Kyung Song,Chung Suk Kim ) 한국산림과학회 1981 한국산림과학회지 Vol.53 No.1
Foliar mutrient concentratins of N. P, K, Ca, Mg, total sugar, starch, ether extracts were determined forthree Pinus Spp., that is, P. rigida, P, taeda, P. rigida×taeda, divided by tree age (16∼19-year old, 6-year old), leaf age(current, over-winter, one-year old). planting location(Kyonggi-Do, Chungman-Do, Junbuk-Do). Foliar compositions of inorganic nutrients were generally put in order of N(0.764∼1.502%)$gt;K((0.130∼0.491%)≥Ca(0.165∼0.442%)Mg(0.054∼0.121%)≒P(0.041∼0.129%) in all the species. The concentrations of total sugar and ether extracts respectively tanged from 5 to 15% of the needles in dry weight base. The concentrations of N,P and K were similarly high in the over-winter needles (sampled in February), but those of Ca were generally high in one-year old needles. As a whole, inorganic nutrient levels in the needles showed different patterns with species, three age, leaf age and location. There were genearally positive correlations between nitrogen and phosphorus in foliar concentrations. Foliar concetrations of total sugar showed the ranking of P.rigida$gt;P.rigida×taeda$gt;P.taeda and the lowest levels in February. Starch in the needles were contained about 10% of total sugar, and the variations of starch level were not regular with the studied factors. Ether, extracts contents increased more of less with leaf age but changed irregularly with the other factors.
김지문,송호경 ( Chi Moon Kim,Ho Kyung Song ) 한국산림과학회 1979 한국산림과학회지 Vol.45 No.1
The morphological differences of pollen of genus Weigela in Korea were examined at different dates and localities, and following results were obtained : 1. Variations in pollen size were distinct among the four species examined. Pollen sizes of W. florida being the largest and W subsessilis the smallest. 2. The same species showed difference in pollen sizes at different dates and localities, and pollen size of W subsessilis which was collected in autumn was the smallest. 3. Variation in the P : E index was relatively small in each collection, the shapes of W. subsessilis and W hortensis being suboblate and those of W. florida and W. praecox spheroidal. 4. Pollens of four species In Mt. Gyeryong had three porate, but W. subsessilis in Mts. Kwanak and Bomun had four.
김지문,권기원,문흥규 ( Chi Moon Kim,Ki Won Kwon,Heung Kyu Moon ) 한국산림과학회 1984 한국산림과학회지 Vol.66 No.1
The variation of stomatal density and stomatal length of four species of oaks was studied for the purpose of examining the differences among populations and among individual trees within population. Nine populations of Quercus mongolica, four populations of Q. serrata and Q. variabilis respectively, and three populations of Q. acutissima were selected in the natural stands of oaks distributed through the whole country. Twelve leaves were sampled from each of 20 trees from each population. The length of 20 stomata and ten replications of stomatal density were measured from collodion replicas of each leaf under a microscope. Average stomatal densities and lengths ranged through 600-1000/㎟ and 19-26㎛ respectively in all of the species studied. The stomatal densities and lengths presented significant differences statistically at the level of 1 or 5% among populations and among individual trees within population in all the species. Quercus mongolica, especially, showed large variation among populations, while Q. variabilis did very narrow variation compared to the other species. The coefficients of variation of stomatal densities and lengths among individual trees within population exhibited small values of 3.7-12.0% and 1.4-5.3% respectively in all the populations of the species. The average stomatal densities of Q. mongolica showed statistically significant correlation of multiple correlation coefficient of R_(df:2.6)=0.868^* and multiple regression equation of Y = 0.041 X₁ (G.M.T.S.) + 0.489 X₂(G.M.H.S.) + 22.37 with the sum of growing season mean daily temperature and the sum of growing season mean daily humidity of the stand studied. However the average stomatal lengths showed no relation with the same meteological variables. The figures of frequency distribution of the measurements of leaves or the mean values of individual trees did not show normal distribution curves in some populations. The curves, as well as the results of ANOVA, exhibited the differences among populations.
김지문,이화형,권기원,송호경 ( Ji Moon Kim,Hwa Hyung Lee,Ki Won Kwon,Ho Kyong Song ) 한국산림과학회 1980 한국산림과학회지 Vol.46 No.1
This study was carried out to examine the substitution possibility into fiber pot instead of Jiffy pot for the good transplanting. Fiber pot was made of fiber, wood waste particle, and bark powder (10% of the particle weight) and also latex was added into the furnish as a binder. The pots were sprayed with just enough urea solution to prevent nitrogen deficiency of pot media coming from the breakdown of wood fiber in the pot wan during the plant growing. The utility of fiber pot was compared with that of Jiffy pot in the service test of two tree species under a green-house condition. The results obtained can be summarized as follows ; 1. Fiber pot made of 30% wood fiber+7O% particle including 10% of bark powder, and 3%-latex has shown a good results like that of Jiffy pot in the sp. gr., tear factor and burst factor. For water absorption, fiber pot made of 50% fiber+50% particle, and 3%-latex got the best result. In the consideration of the above physical and mechanical properties of the fiber pot for good root penetration through the pot wall and facile handling, fiber pot made of 30% fiber+70% particle, and 3%-latex may be seemed to be good. 2. There were no harms in sapling growth in fiber pot as well as in Jiffy pot. The root penetration ability through the fiber pot was slightly inferior to that of Jiffy pot, and yet the pot damage through transportation seemed to be slighter in fiber pot than in Jiffy pot.
Effect of Graphene on the Sound Damping Properties of Flexible Polyurethane Foams
김지문,김도훈,김지완,이정욱,김우년 한국고분자학회 2017 Macromolecular Research Vol.25 No.2
The sound absorption coefficient, airflow resistivity and cell size of polyurethane (PU) foam with graphene as a solid-type additive and tetramethylsilane (TEMS) as a liquid-type additive were investigated. The results show that the sound absorption coefficient and airflow resistivity are closely related, and that increase of the flow resistivity improves the sound absorption coefficient of the PU foam. For the PU foam/graphene (0.2 phr) composite, the values of the sound absorption coefficient and airflow resistivity were 0.52 (frequency range of 1600 to 2500 Hz) and 292,900 Ns/m4, respectively, which were the highest values among the investigated additive species and additive content. The sound absorption coefficient of the PU foam/graphene (0.2 phr) composite increased by 18.2% compared with that of the PU foam without graphene. The results of the sound absorption coefficient and airflow resistivity of the PU foam suggest that graphene is an effective additive in the formation of the PU foam to decrease the cell size and increase the tortuous paths of the foams, and this small cell size consequently increases the acoustic damping properties of the PU foam.