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한국에서의 활주로(도로) 표면온도와 표면빙결 예보를 위한 수치모형
김보희 한국항공대학교 1995 論文集 Vol.33 No.-
A numerical model for the prediction of runway(road) temperature and ice has been tested on data from Susack. The model is based on the solution of the equation of heat conduction in the ground and the surface energy-balance equation. Sensitivity experiments have been carried out in order to assess the relative importane of the various active processes. It is importannt to specify a realistic temperature and cloud structure in the lower part of the atmosphere. The best results were obtained with a detailed temperature and humidity analysis using significant points in the applied radiosonde data. Some further improvement was obtaind with a simple capable of adjusting the initial atmospheric tmeparature profile for analysis bias. The results indicate that the model can be used for high-quality road temperature forecasts up to a range of at least 3h.
大氣中 黃酸鹽粒子의 구름凝結核으로서의 可能性에 關한 實驗
金保熙 한국항공대학교 1986 論文集 Vol.24 No.-
To sudy directly the capability of atmospheric Sulfate particles as cloud condensation unclei (CCN), I cacrried out a series of experiments using a vertical flow type thermal diffusion cloud chamber in conjunction with the application of Bacl₂ thin film technique for the detection of soluble sulfate in individual particles. From this direet experimental result, the atmospheric sulfate particles with mass larger than ?? are infact served as very efficient CCN at low, cloud-like supersaturations of 1% or less.
金保熙 한국항공대학교 1973 論文集 Vol.6 No.1
The vertical velocity in pressure co-ordinates is computed from synoptic data with baroclinic model on two occasions for each loomb interval between l000mb and 200mb at the points, approximately 100Km apart, of a grid covering much of Korea and surrounding area, The results show that the vertical profile is approximately parabolic with respect to pressure in regions of great development, but that elsewhere the profiles are not of a simple shape.
金保熙 한국항공대학교 1977 論文集 Vol.12 No.-
This study is treated physically and synopticaly to the trend of the surface pressures in the case of two troughs existing both side of the middle latitude jet stream over th Asia. The resoult shows that the increase of instability of the jet stream makes intensification of the trough, and unificate the small lows in one low pressure, and make the low pressure begin to move.
金保熙 한국항공대학교 1976 論文集 Vol.10 No.-
The jet stream over the Far East area is studied in accodance with the crosssection charts and upper charts with a view to enabling it to be applicable in flight. Through this study, it is derived that in the warm season the jet stream weakens and moves northward and that in the cold season it develops over wide aren conserving the height between 300mb and 200mb.
김보희,김미금,현준영 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.4
Purpose: To compare the effects of bifocal versus trifocal diffractive intraocular lens (IOL) implantation on visualquality after phacoemulsification in patients with cataracts. Methods: Eighty-eight eyes from 63 patients were analyzed. Trifocal (AT LISA tri 839MP), bifocal (AcrySof IQReSTOR) and bifocal (Tecnis MF ZLB00) IOLs were implanted into 53, 18, and 17 eyes, respectively. Uncorrecteddistance, intermediate and near visual acuity, refractive errors, contrast sensitivity, and patient satisfactionwere measured at 1 week and 1 month after surgery. Refractive error was converted to a spherical equivalentand compared to predicted refraction calculated by IOL calculation formulas. Results: Uncorrected distance, intermediate, and near visual acuity did not differ significantly between groups. One month after surgery, the mean refractive errors were -0.07 diopters (D) in the AT LISA tri 839MP group,+0.18 D in the AcrySof IQ ReSTOR group, and +0.31 D in the Tecnis MF ZLB00 group (p < 0.001). The predictiveaccuracy of IOL calculation formulas did not differ between groups. Contrast sensitivity, satisfaction, andspectacle independence in the trifocal group were comparable with those of the two bifocal groups. Conclusions: Trifocal IOL and two different types of bifocal IOL implantation were all effective for improving visualquality, although refractive error in patients with trifocal IOL shows myopic tendencies.
金保熙 한국항공대학교 1982 論文集 Vol.20 No.-
To study the characteristics of Susaeck radiation fogs, 11 radiation fogs are collected on the meshes coated with cllodion thin film from June 1981 to March 1982. The collected fog droplets and their nuclei are observed by the vapor diposited thin film method and microscope. According to the results, the relation between fog droplets and their nuclei is represented by y=14.24x+3.64. And most of th nuclei are sulfate particles. The distribution of number and size of droplets are related to the distribution of number and size of muclei. On the water amount distribution, maximam water amount distributed in the interval 11-15μm droplet diameter. The results suggest that sulfate nuclei play an important role in the initiation and growth of Susaeck radiation fogs.
金保熙 한국항공대학교 1980 論文集 Vol.17 No.-
The vapour-deposited thin-film of barium chloride reacted with sulphuric mist directly but the reaction of sulphate is caused to proceed by exposure to the vapour of a suitable octonal. By this method, the method, the original material of the polluted urban air, photochemical smog and haze are detected. The orginal material of the urban air is sulphate. When the photochemical smog or haze is formed, the original material is sulphuric mist. Additionally, the vapour-deposited thin-film method of barium chlorede can be one of the method to determine that the sulphuric mist is the original material of the acid rain.
金保熙 한국항공대학교 1985 論文集 Vol.23 No.-
To estimate the probabilities of airport operation for domestic airport, the frequency tables of ceiling and visibility Was used. At first probability was estimated by Thom's formula. Result of this was unsatisfied with T-value greater than 2.201. The second, the coeffecient of association terms of visibility and ceiling for each airport were derived and established the probability formula. The estimated probabilities with this formula were satisfied with T-values less than 0.93.