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CR 기술 응용사례 : 미국 TV Whitespace 서비스모델
김기홍,황성호,민준기 대한전자공학회 2009 전자공학회지 Vol.36 No.6
2004년 이후 미국 IEEE802 표준화 기구에서는 지역별로 사용되지 않는 유휴 TV 방송채널을 비면허 방식 무선접속 서비스용도로 사용하기 위한 기술표준 및 서비스모델 제정 작업이 진행되고 있다. 작은 전파감쇄 특성과 높은 전파투과 특성을 지니는 방송대역 주파수를 활용한 서비스로는 일반적인 이동통신망의 기지국 커버리지 보다 넓은 지역을 커버하는 무선 지역접속망(WRAN)부터 확장된 형태의 무선랜에 이르기까지 다양한 모델이 논의되고 있다. 본 고 에서는 미국을 중심으로 논의되고 있는 서비스모델을 중심으로 기술적, 사업적 관점에서 고려될 수 있는 다양한 서비스모델에 대하여 논하고자 한다.
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.
김기홍,서순봉 대한피부과학회 1974 大韓皮膚科學會誌 Vol.12 No.1
In order to evaluate the accurate diagnosis of scabies through exatr.inations of all requred. conditions, the author conducted an observation on 769 cases of scabies at the Department of Dermatology, Kyungpook University Hospital from January, 1962 to Octover, 1973. In 1962 the frequency of the disease appeared to be low but it dramatically rose to 20 or 30 times between 1963 and 1966, again showing an increasing tendency from 1971. The ratio of frequency between male and female was 4.2: 1. Seasonal occurrence of scahics was found to be highest in winter. Infectious rate in the family was 83.3% and incubation period vas estimated from 15 days to 2 months. Acarus scabiei or its ova were found in 46.5% of all cases examined and in patients over 16 years of age. Acarus scabiei or ova were chiefly found in vesicles of the finger web but the ova were also found in the subungual fold of the finger, which is an important site of examination.
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.