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Iwao, Toru,Shimokura, Takuya,Sakai, Tadashi,Mori, Yusuke,Tanaka, Manabu,Tashiro, Shinichi,Yumoto, Motoshige The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.3
Welding technology has been developed to improve welding quality. Especially, plasma arc welding has been used for a wide range of areas. However, welding defects occur because of inappropriate arc conditions and lack of arc control with metal vapor contamination in the arc column and anode root. The metal vapor contamination from the anode is varied by the electrical conductivity of the arc in high-temperature medium. The arc emits intense radiation. In this paper, the temperature distribution of the plasma arc contaminated with iron vapor from the anode under consideration of self-absorption was elucidated to develop the plasma arc welding technology and avoid the welding defect. Electromagnetohydrodynamic (MHD) simulation is used to calculate the temperature. Results show that the temperature distribution was varied under consideration of self-absorption because of the iron vapor distribution, and because ionized argon exists near the cathode.
Sakakibara Fumihiro,Uchida Kazutaka,Yoshimura Shinichi,Sakai Nobuyuki,Yamagami Hiroshi,Toyoda Kazunori,Matsumaru Yuji,Matsumoto Yasushi,Kimura Kazumi,Ishikura Reiichi,Inoue Manabu,Ando Kumiko,Yoshida 대한뇌졸중학회 2023 Journal of stroke Vol.25 No.3
Background and Purpose Differences in measurement of the extent of acute ischemic stroke using the Alberta Stroke Program Early Computed Tomographic Score (ASPECTS) by non-contrast computed tomography (CT-ASPECTS stratum) and diffusion-weighted imaging (DWI-ASPECTS stratum) may impact the efficacy of endovascular therapy (EVT) in patients with a large ischemic core. Methods The RESCUE-Japan LIMIT (Recovery by Endovascular Salvage for Cerebral Ultra-acute Embolism Japan–Large IscheMIc core Trial) was a multicenter, open-label, randomized clinical trial that evaluated the efficacy and safety of EVT in patients with ASPECTS of 3–5. CT-ASPECTS was prioritized when both CT-ASPECTS and DWI-ASPECTS were measured. The effects of EVT on the modified Rankin Scale (mRS) score at 90 days were assessed separately for each stratum. Results Among 183 patients, 112 (EVT group, 53; No-EVT group, 59) were in the CT-ASPECTS stratum and 71 (EVT group, 40; No-EVT group, 31) in the DWI-ASPECTS stratum. The common odds ratio (OR) (95% confidence interval) of the EVT group for one scale shift of the mRS score toward 0 was 1.29 (0.65–2.54) compared to the No-EVT group in CT-ASPECTS stratum, and 6.15 (2.46–16.3) in DWI-ASPECTS stratum with significant interaction between treatment assignment and mode of imaging study (<i>P</i>=0.002). There were significant interactions in the improvement of the National Institutes of Health Stroke Scale score at 48 hours (CT-ASPECTS stratum: OR, 1.95; DWIASPECTS stratum: OR, 14.5; interaction <i>P</i>=0.035) and mortality at 90 days (CT-ASPECTS stratum: OR, 2.07; DWI-ASPECTS stratum: OR, 0.23; interaction <i>P</i>=0.008). Conclusion Patients with ASPECTS of 3–5 on MRI benefitted more from EVT than those with ASPECTS of 3–5 on CT.
Itoh Yasunobu,Kitagawa Ryo,Numazawa Shinichi,Yamakawa Kota,Yamada Osamu,Akasu Isao,Sakai Jun,Otomo Tomoko,Yoshida Hirotaka,Mori Kentaro,Watanabe Sadayoshi,Watanabe Kazuo 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.3
In C1–C2 posterior fixation, the C1 lateral mass and C2 pedicle/translaminar screw insertion under spine navigation have been used frequently. To avoid the risk of neurovascular damage in atlantoaxial stabilization, we assessed the safety and effectiveness of a preoperative computed tomography (CT) image-based navigation system with intraoperative independent C1 and C2 vertebral registration. It is ideal when a reference frame can be linked directly to the C1 posterior arch for C1-direct-captured navigation, but there is a mechanical challenge. A new spine clamp-tracker system was implemented recently, which allows reliable C1- and C2- direct-captured navigation in nine patients with traumatic C2 fractures. In this way, there was no misalignment of C1–C2 screws. C1 lateral mass screws were used except for one case, and translaminar screws were primarily used as an anchor for C2. The C1 lateral mass screw locations, which are 19 mm laterally from the C1 posterior arch’s center, are taken to be constant. However, there is one unusual circumstance in which using a C1 laminar hook instead of a C1 lateral mass screw appears to be a beneficial substitute. The increase of surgical accuracy for posterior C1–C2 screw fixation without cost constraints is significantly facilitated by intraoperative C1- and C2-direct-captured navigation with preoperative computed CT images.