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Yamagishi Akira,Sakaura Hironobu,Ishii Masayoshi,Ohnishi Atsunori,Ohwada Tetsuo 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.3
Study Design: Retrospective cohort study. Purpose: This study aimed to investigate relationships between clinical outcomes and radiographic parameters in patients with pseudoarthrosis after posterior lumbar interbody fusion (PLIF). Overview of Literature: In some patients with pseudoarthrosis after PLIF, clinical symptoms improve following surgery, although pseudoarthrosis can often be one of the complications. However, there are no previous reports describing differences between patients with pseudoarthrosis after PLIF who have obtained better clinical outcomes and those who have not. Methods: Twenty-seven patients who were diagnosed with pseudoarthrosis after single-level PLIF with cortical bone trajectory screw fixation (CBT-PLIF) were enrolled in this study. They were divided into two groups based on mean improvement of 22 points on the Oswestry Disability Index (ODI) at the 2-year follow-up. Group G consisted of 15 patients who showed improvement on the ODI of ≥22 points, and group P consisted of the residual 12 patients. Radiographic parameters, percentage of slip, lumbar lordosis (LL), segmental lordosis, segmental range of motion, screw loosening, and subsidence were compared between the two groups. Results: There were no significant differences between the two groups on radiographic parameters except for postoperative changes in LL. Although surgery-induced changes in LL showed no significant difference between the two groups, changes in LL from before surgery to 2-year follow-up and during postoperative 2-year follow-up were significantly better in group G (mean change of LL: +3.5° and +5.1°, respectively) compared to group P (mean change of LL: −4.6° and −0.5°, respectively) (p<0.01 and 0.05, respectively). Conclusions: Patients with greater improvement in ODI gained LL over the 2-year follow-up, whereas patients with less improvement in ODI lost LL during the 2-year follow-up. These results indicate that there is a significant correlation between clinical outcomes and LL even in patients with pseudoarthrosis after single-level CBT-PLIF.
Kengo Nakada,Akira Ishii,Natsumi Yamamoto 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report ab initio calculations of atom substitute in the graphene and atomic adsorption onthe graphene with the defect. We calculated local stable structure, the bond energy and magneticmoment when N, Al, Ga and In atom are adsorbed to the point defect graphene. The structureof N atom substitution in the defect site of graphene is the most stable configuration. Magneticemerges in a point defect, but it disappears by this substitute. Binding energy of the N atomicadsorption on the defect graphene is very highly 14.0 eV. This bond energy is even larger than thebond energy of N2 molecules. Furthermore, N, Al, Ga and In atom are adsorbed on N substituted. We calculated bond energy and the migration energy in the adsorption of these adatom. Whenadatom is adsorbed on N atom substituted graphene, bond energy and tendency of the migrationenergy are tendency same as the graphene without defect. These calculation result suggests thata recoverability of defected graphene is possible using the N atomic adsorption substitutionally atthe defect.
( Masataka Arai ),( Akira Ishii ),( Masahiro Saito ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
Atomization behavior of a single droplet impinged on surface oscillating with ultra-sonic frequency of 20 kHz was investigated as a new method of fine-spray formation. Distilled water, ethanol and 50-80wt% glycerin solution were used as the test liquids to find the effects of viscosity and surface tension on ultra-sonic atomization. The amplitude of oscillation A and the droplet volume Vd were changed between A =25-125μm, Vd = 4-20 mm3 respectively. As the result, it was found that a fine spray was formed after the droplet impingement when the amplitude was smaller than A =50μm, while ligament and large droplets were formed at larger amplitude than A =50μm. The SMD of the spray after impingement was about D32=70μm when the amplitude was small, but the SMD became large with increase of the amplitude. Also, at low amplitude of A =25μm, the surface energy of spray after impingement increased remarkably compared with that of droplet before impingement. On the contrary, at amplitude of A >50μm, the kinetic energy after impingement has exceeded the surface energy. Namely, the oscillation energy was acted for rebounding of droplet rather than the atomization of droplet. The atomization efficiency decreased exponentially with increasing the amplitude of oscillation independent of the physical properties of test liquids. Thus, the low amplitude of oscillation could allow fine atomization by the disintegration of liquid film after the droplet impingement.