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權赫春 大韓齒科保存學會 1980 Restorative Dentistry & Endodontics Vol.6 No.1
Abstract A total of 125 extracted maxillary first molars were used to study the configuration of the^ floor of the pulp chamber. The specimens were ground and the pulp chamber was examined with a magnifying glass and explored with sharp explorer. The study showed the, shape of the pulp chamber, number of root canals, and type of canal orifice.The results were as follows; 1. In so far as observing, the shape of the pulp chamber of the teeth, 50.4% of the teeth were trapezoid, 20.8% were inverted trapezoid, 18.4% were rectangle and 10.4% were triangle shape. 2. 71.2% of the specimens have 3 root canal orifices, and 28.8% have 4 root canal orifices. 3. 71. 2% of the specimens have 1 mesiobuccal canal orifice, 23. 2% have 2 mesio-buccal canal orifices joined, .by a groove, and 5.6% have 2 mesio-buccal canal orifices seperated each other.
Susceptibility Analysis of Debris Flow Based on GIS in Yanbian Region, China
권혁춘,이병걸 대한공간정보학회 2019 대한공간정보학회지 Vol.27 No.6
Yanbian area is taken as the research area In this study, nine influencing factors, including elevation, slope, aspect, precipitation, river, stratum lithology, soil types, fault and land use, are selected. 327 debris flow points in the study area are taken as sample data. back propagation(BP) neural network model and information quantity model are introduced to calculate the weight of each influencing factor, and the susceptibility of debris flow in this area is evaluated and analyzed. The results show that 15% of Yanbian area is susceptible to debris flow, it mainly distributes in the middle part of Helong City, the northern part of Antu County, the middle part of Hunchun City and the southern part of Dunhua City, and the major factors influencing debris flow disasters are river, elevation, slope and rainfall. The susceptibility analysis map obtained by the neural network model is more consistent with the debris flow in the history of Yanbian Prefecture, and 80% of the debris flow occurs in the comparatively dangerous areas and danger areas.