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Effect of Austempering Treatment on Dynamic Characteristics of Brake Drums
임경빈,Yim, K.B. The Korean Society of Manufacturing Technology Eng 2010 한국공작기계학회지 Vol.19 No.1
The effect of austempering treatment on the dynamic properties of a brake drum was investigated to primarily evaluate the potential damping advantage of an AGI (austempered gray iron) drum over a PGI (pearlitic gray iron) drum. This investigation provides valuable information for brake noise reduction since the brake drum is most often the outstanding component that generates the noise of the brake assembly. Test results show that the AGI drum provided slightly larger damping values than the PGI drum for the first few major resonances observed. A finite element model of a drum was also developed to aid in studying its dynamic behavior. A good correlation was obtained between the analytical results and the actual measurement data.
The Variation of natural population of pinus densifiora S. et Z. in Korea
K.B. YIM(任慶彬),Y.S. KIM(金用植),K.J. LEE(李景宰) 한국육종학회 1981 한국육종학회지 Vol.13 No.2
In the geographic variations of the resin canal numbers, tracheid length, and seed length, the natural populations of Pinus densiflora examined could be devided into two groups, one along the Taebek Mountains, and the other one along the Sobek Mountains, two main mountain chains in this country. This grouping could be confirmed by the statistical analysis of T-test. The length of the tracheid and the seed are generally longer in the Sobek group than that in the Taebek group. The epicotyl length showed a strong north to south clinal variation particularly along the Sobek Mountains. The mean seed-wing width and length, seed length, thousand seed weight, cone diameter and length, cone weight, mean width of 10 annual ring segment, specific gravity of wood, early to late wood ratio, resin canal number, and the seedling height showed highly significant differences among populations and some characters within population, and also between families.
Effect of Austempering Treatment on Dynamic Characteristics of Brake Drums
K. B. Yim(임경빈) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.1
The effect of austempering treatment on the dynamic properties of a brake drum was investigated to primarily evaluate the potential damping advantage of an AGI (austempered gray iron) drum over a PGI (pearlitic gray iron) drum. This investigation provides valuable information for brake noise reduction since the brake drum is most often the outstanding component that generates the noise of the brake assembly. Test results show that the AGI drum provided slightly larger damping values than the PGI drum for the first few major resonances observed. A finite element model of a drum was also developed to aid in studying its dynamic behavior. A good correlation was obtained between the analytical results and the actual measurement data.
J. S. Yi(李在善),K. B. Yim(任慶彬) 한국육종학회 1981 한국육종학회지 Vol.13 No.3
This investigation of pollen formation and germination, and strobilus characteristics in Pinus koraiensis was carried out to determine the most adequate time for pollen collection. The pollen before the first mitotic cell division, not having a prothalial and a central cell, did not germinate; only the pollen containing 2 to4nuclei (after the first, second, or third mitotic division) germinated. The pollen procured from the male strobili (which ware dried in the shade for 3 days immediately after collection) showed 59% germination rate. At this stage, the pollen grains completed the third mitotic cell division. The staminate flowers were a light yellow-green or a bright yellow-green color. The tip part of staminate strobilus was tinted with dull red or deep red-purple spots. The bracts were bent back and individual sporangia separated each other. The pollen at the stage of dispersion showed germination rate of 99%.
A Method for testing seed viability of some coniferous trees in Korea
H. S. Park(朴孝燮),D. K. Lee(李敦求),K. B. Yim(任慶彬) 한국육종학회 1983 한국육종학회지 Vol.15 No.3
This study was conducted to examine the possibility of determining the internal characters of four coniferous tree seeds (Pinus densiflora, Pinus koraiensis, Pinus rigida and Larix leptolepis) by X-ray photography, to examine the influence of seed (embryo-endosperm) quality on germination, and to compare the seed germinability between by tetrazolium method and by X-ray contrast method. X-ray photography was a useful tool to measure the embryo and endosperm development of the conifer seeds. The different stages of embryo and endosperm development observed on the photographic plates were classified into 5 embryo-classes (0, I, II, III and IV) and 2 endosperm-classes(A and B). The seeds of Larix leptolepis and Pines rigida were classified into 4 embryo-classes and 2 endosperm-classes. Pines densiflora seeds mostly consisted of III-A and IV-A classes. Many of Larix leptolepis seeds were empty. The seeds of Pinus densiflora and Pinus rigida exhibited mostly IV-A class and those of Pinus koraiensis mostly III-A class. The degree of embryo-endosperm development affected the germinability. The higher was the embryo-endosperm class the better was the germinability of the seed. The seeds belonged to embryo class II were germinated slower than those to classes III and IV. The germination capacity of endosperm class A was better than that of endosperm class B. The results compared between X-ray contrast and tetrazolium methods for examining germinability indicated that the germination values obtained by X-ray contrast method were more closely related to those in an incubator than to those obtained from the tetrazolium method The tetrazolium method was reliable for the rapid determination of seed germinability if treated properly. However, the X-ray contrast method was more precise, simpler and quicker than tetrazolium method for examining seed germinability. Thus, the X-ray contrast method is recommendable to examine seed viability for these four coniferous species.