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- 저자 : 박석범 (검색결과 54 건)
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박석범,구자예,Park, Seok Beom,Koo, Ja Ye 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.8
Computational investigation was conducted to examine the performance of a high pressure common-rail fuel injection system which is used to power a passenger car direct injection (Dl) diesel engine. The pipe flows were modeled by one dimensional wave equation and solved by implicit FDM Each volume of injector was considered as chambers with orifice nozzle in connections. These simulation results were compared with the experimental data of Ganser Hydromag. The comparison of needle life and rate of injection between simulation data and experimental data showed quite a good agreement Different shape of injection rate can be made by adjusting the size of inlet orifice and exit orifice in the piston chamber The pilot injection was accomplished by adjusting command signal.
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Polyphosphate가 함유된 근관충전재가 구강세균의 성장에 미치는 영향
박석범,최기운,최호영 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.2
Eliminating the infecting bacteria of the root canal system and preventing reinfection must be the main objectives of all endodontic works. None of commercially available root canal sealers have the properties of desirable tissue compatibility and strong antibacterial activity. The purpose of this study is to develope an ideal root canal sealer using commercially available polyphosphate (polyP), Calgon, which is known to be antibacterial and safe. For the study, resin-type AH26, zinc oxide eugenol-type Tubli-Seal, Ca(OH)2-type Apexit as base sealers for polyp (0∼3%) and para formaldehyde-containing N2 as a control base were selected. Specimens (3×4mm) of the sealers were prepared in a 37℃ incubator far 3 and 10 days and their antibacterial activity against streptococci and black-pigmented anaerobic rods was observed using an agar diffusion method. The result were as follows : 1.Among 3-day-old root canal sealers, N2 as a positive control showed the strongest antibacterial effect, followed by AH26, Tubli-Seal and, Apexit which barely showed antibacterial activity against the test bacteria. In contrast, 10-day-old AH26 showed a greater antibacterial activital than 10-day-old N2. 2.All sealer specimens showed a greater antibacterial activity against black-pigmented anaerobic rods than streptococci. Three-day-old ones appeared to be more antibacterial than 10-day-old ones except for Apexit. 3.As compared to N2, 3-day-old AH26 demonstrated a similar antibacterial activity against black-pig-mented anaerobic rods but to a lesser extent to streptococci. Ten-day-old AH26 showed a greater antibacterial activity against black-pigmented anaerobic rods than 10-day-old N2. 4.As compared to AH26, Tubli-Seal generally revealed a lower antibacterial activity but it showed a greater antibacterial activity aginst S. gordonii Challis. 5.Enhancement of antibacterial activity by polyp was more clearly observed when it was added to Ca(OH)2-based root canal sealers, Tubli-Seal and N2. 6.The addition of polyP enhanced the antibacterial activity of 3-day-old AH26 against S. gordonii G9B (16%) and Challis (29%), and P. gingivalis 2561 (24%) only. Moreover, polyp failed to increase antibacterial activity of 10-day-old AH26 against the test strains but P. gingivalis A7A1-28 (13%). 7.The addition of polyp increased the antibacterial effect of 3-day-old Tubli-Seal on several test bacteria including S. mutans GS-5 (50%), S. gordonii G9B (47%) and Challis (122%), and all the test strains of P. gingivalis (13∼35%) except for 9-14K-1. The addition of polyp to 10-day-old Tubli-Seal increased antibacterial activity of the root canal sealer against most test strains. 8.3-day-old Apexit failed to show antibacterial activity, if any very little against S. mutans GS-5 and Pr. intermedia ATCC 49046. However, polyP increased its antibacterial activity by 50 and 69%, respectively. Increase of antibacterial activity of 10-day-old Apexit by polyP was more clearly observed than that of 3-day-old one. The overall results suggest that polyP may be used in clinic as an antibacterial agent in root canal sealers. However, in order to maximize its antibacterial effect, the composition of sealers should be considered.
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