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김기홍 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.12
The Goos-H¨anchen shift of p wave beams incident on a metal-nonlinear dielectric bilayer in the Kretschmann configuration is studied theoretically. The reflectance, the phase of the reflection coefficient and the Goos-H¨anchen shift are calculated in a numerically precise manner by using the invariant imbedding method. The Goos-H¨anchen shift has been found to be able to take both extremely large positive and negative values due to surface plasmon excitations and very strong bistability and unique hysteresis phenomena appear. In addition, several previous results on the intensity dependence of the Goos-H¨anchen shift are pointed out to be erroneous.
사과겹무늬썩음병균 Botryosphaeria dothidea 에 의한 Pectin 질 분해효소의 생산
김기홍,이창은,박석희 한국균학회 1991 韓國菌學會誌 Vol.19 No.2
Botryosphaeria dothidea causing apple fruit rot was cultured in pectin-polypectate mineral salts or apple mediumss, to investigate pectolytic enzyme production and activity. Exo-polygalacturonase(PG) and exo-polymethylgalacturonase (PMG) in apple medium showed maximum of activity to 6.4 and 7.2 units at six days of culture, respectively. Their maximum activity in pectin-polypectate mineral salts medium was 5.9 and 5.3 units at eight days of culture lower than in apple medium respectively. Endo-PG and endo-PMG in pecin-polypectate mineral salts medium were maximum of activity to 4.4 and 16.2 units at six and eight days of culture, respectively, but activities in apple medium were 3.2 and 6.7 units at eight days of culture. Activity of polygalacturonate-trans-eliminase(PGTE) and pectinmethyl-traps-eliminase(PMTE) was higher in pectin-polypectate mineral salts medium than in apple medium. Fungal growth was maximum at six and eight days of culture in pectin-polypectate mineral salts and apple medium, respectively.
k-ε 모형에 의한 2차원 균질분류장의 해석에 관한 연구
김기홍,이형래 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
A numerical study on the homogeneous jets has remained of requiring more intensive investigation for problems due to the treatments of free surface, Reynolds stress /flux terms in turbulent flow. The verification of predicted results from the numerical study continues to be in the qualitative study, because of the lack of experimental data, due to the difficulties in measuring the turbulent fluctuations in flow. In this study, the computer program of k-ε model being widely used for the simplicity of computation has been developed to compute the characteristics of two-dimensional homogeneous jets with the free surface boundary condition. By comparing these results with Gaussian distribution, it is found that this model can predict fairly well the characteristics of two-dimensional homogeneous jets in the momentum region.