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Kazuhiro Kai,Ko Ikuta,Keigo Masuda,Takahiro Kitamura,Hideyuki Senba,Satoshi Shidahara 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.3
Study Design: A retrospective study. Purpose: To evaluate the clinical and radiological outcomes of ankylosing spinal disorder (ASD) patients with spinal fractures treated by minimally invasive stabilization (MISt) using percutaneous pedicle screws (PPSs). Overview of Literature: ASDs, such as ankylosing spondylitis (AS) and diffuse idiopathic skeletal hyperostosis (DISH), increase susceptibility to spinal fractures because of extremely decreased spinal flexibility. Such fractures tend to be unstable and, consequently, should be treated with multiple-segmental internal fixation. However, conventional internal fixation procedures can severely damage the soft tissue, resulting in severe hemorrhage. Therefore, MISt is the preferred approach to treat spinal fractures in ASD patients. Methods: Nine ASD patients (four males and five females; three AS and six DISH patients) with spinal fractures who were treated by MISt using PPSs, were reviewed from April 2009 to August 2016. One patient died of aspiration pneumonia during follow-up (FU), and the remaining eight patients underwent clinical and radiological evaluation. Results: The mean age at surgery was 79.6 years (range, 68–95 years). The mean duration of postoperative FU was 14.2 months (range, 3–30 months). All treated fractures were anterior and posterior element injuries with distraction. Three patients presented delayed onset preoperative neurological deficit following trauma. The mean operation time was 179.6 minutes (range, 92–340 minutes). The mean hemorrhage was 103.6 mL (range, unquantifiable to 480 mL). Radiological evaluations at FU showed preservation of the acceptable postoperative correction of the fractured vertebra, as there were no re-collapses of the fractured vertebrae during FU. Conclusions: ASD patients must be acknowledged as highly susceptible to unstable spinal fractures, even after relatively mild trauma. MISt using PPSs may be an effective treatment for spinal fractures in such patients.
Structural Design of High-Rise Building in Toranomon-Azabudai Project (A Block)
Kazumasa, Okabe,Kai, Toyama,Takuya, Furuta,Jyunichi, Yamashita,Hiroki, Mukai,Takahiro, Goseki,Shingo, Masuda,Dai, Shimazaki,Yusuke, Miyagi,Yuji, Ozawa Council on Tall Building and Urban Habitat Korea 2022 International journal of high-rise buildings Vol.11 No.3
This paper explains about structural planning and structural design of the high-rise building in Toranomon-Azabudai Project (A Block) which is now under construction. The building is about 330 meters high, has 4.2 aspect ratio, and the outline of the building has shallow curve. We adopted seismic response control structure. The building is a steel rigid frame structure with braces, and it has enough stiffness to obtain its primary natural period to be less than about seven seconds, in consideration of wind response, seismic response and inhabitability for the wind shaking. In terms of business continuity plan, the building has a high seismic performance; value of story drift angle shall be 1/150 or less and members of the building remain almost undamaged while or after a large earthquake. Active mass dumper shall be installed at the top of the building to improve inhabitability while strong wind is blowing.
? Research Activities on MIR-FEL and table top THz Generation inKyoto University
OHGAKI, Hideaki,KII, Toshiteru,MASUDA, Kai,Arby, ABDEL AZIEM MAHMOUD Bakr,HIGASHIMURA, Keisuke,KINJO, Ryota,YOSHIDA, Kyohei,UEDA, Satoshi,SONOBE, Taro,Uk, Jeong Young Korean Physical Society 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.2
Application of MIR-FEL Irradiation to Selectively Excite Phonons in Wide-gap Semiconductors
Kyohei Yoshida,Taro Sonobe,M. A. Bakr,Y. W. Choi,Ryota Kinjo,M. Omer,Masato Takasaki,Satoshi Ueda,Naoki Kimura,Keiichi Ishida,Kai Masuda,Toshiteru Kii,Hideaki Ohgaki 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
A mid-infrared free electron laser (MIR-FEL) (5 - 20 μm) facility (KU-FEL: Kyoto University Free Electron Laser) was constructed to aid in various energy science researchers at the Institute of Advanced Energy, Kyoto University. In May 2008, the first power saturation at 13.2 μm was achieved. A pilot application to evaluate selective phonon excitation processes in solid materials by irradiating with MIR-FEL was implemented, and a preliminary experiment without FEL irradiation was conducted. N-doped silicon carbide (SiC) was selected as a sample material due to its unique electrical property where the lattice vibration and electronic structure are coupled. Two peaks at 1.8 - 2.4 eV and 2.4 - 2.8 eV, which showed strong temperature dependences in both their intensities and peak energy, were observed. These tendencies could be explained by a donor-acceptor pair luminescence (DAP) model with impurity and defects in the SiC sample. The results imply that we can verify the selective phonon excitation by investigating the change of PL spectrum introduced by MIR-FEL irradiation.