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- 저자 : Hirotaka KOGA (검색결과 2 건)
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Muneyoshi Fujita,Hirotaka Kawano,Tomoaki Kitagawa,Hiroki Iwai,Yuichi Takano,Hirohiko Inanami,Hisashi Koga 대한척추신경외과학회 2019 Neurospine Vol.16 No.1
Objective: Full-endoscopic spine surgery (FESS) is a relatively less invasive treatment for lumbar disc herniation (LDH). This study investigated the optimal operative route of the posterolateral approach (PLA) of FESS for the treatment of L5/S1 LDH. Methods: Between June 2016 and November 2018, a total of 21 patients with leg pain due to L5/S1 LDH underwent PLA of FESS. According to the partial removal of the superior articular process (SAP) of the L5/S1 facet joint (FJ), we categorized these patients into 2 groups. LDH type, anatomical configurations (FJ, sacral ala [SA], and iliac crest [IC]), the presence or absence of spondylolysis, operation time, and operative outcome were compared between these 2 groups. Results: Although the anatomical configuration of the FJ was the most important factor for the necessity of SAP removal, the configuration of the SA and IC did not restrict endoscope insertion and subsequent LDH removal. Even in intracanal LDH, the removal of SAP was not absolutely required depending on the FJ configuration. Furthermore, the presence of spondylolysis was a factor associated with the unnecessity of SAP removal. Conclusion: Detailed radiological examination of the FJ configuration is an important preoperative investigation to determine the optimal operative route for PLA of FESS.
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Flame Propagation to Lean Region in Stratified Mixture Formed by Transient Gas Fuel Jet
Toshiaki KITAGAWA,Hiroyuki KIDO,Kyu Sung KIM,Hirotaka KOGA 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
Combustion characteristics of the stratified mixture were examined by the experiments using a constant volume bomb and the numerical simulations of counterflow premixed flame. We investigated the characteristics of the flame propagation to the lean region and examined the minimum equivalence ratio of the lean region that the flame generated in the rich region can propagate to, as the bulk quenching was found to occur in the over lean region.<br/> In the experiments, the stratified mixture was formed in the constant volume bomb by the injection of gaseous propane into the lean propane-air mixture charge, whose equivalence ratio was less than the lower flammability limit of the premixed mixture. The flame generated in the fuel jet region propagated wide into the lean mixture charge region as the stoichiometry of the mixture charge was increased, even though the charge was too lean to ignite. This result shows the flame in the rich region propagates into the lean region by the "back-support" of the rich flame.<br/> Numerical study of counterflow premixed flame was examined next in order to investigate the interaction between the rich flame and the lean region. Rich and lean mixtures were opposed and the stoichiometry of the lean mixture was varied widely. Reaction rate of the propane in the lean mixture was large when the equivalence ratio of the lean mixture was 0.40 or more.<br/>
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