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Suzuki Tetsuya,Tsuji Osahiko,Ichikawa Masahiko,Ishii Ryota,Nagoshi Narihito,Kawakami Michiyuki,Watanabe Kota,Matsumoto Morio,Tsuji Tetsuya,Fujiwara Toshiyuki,Nakamura Masaya 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: This is a single-center retrospective cohort study with a university hospital setting.Purpose: This study aims to evaluate the short-term course of physical function and walking ability after intramedullary spinal cord tumor (ISCT) resection and predict walking independence 1 year after surgery.Overview of Literature: Although several reports have shown the postoperative functional prognosis of spinal intramedullary tumors with long-term follow-up, no reports have identified the predictors associated with the functional outcome at an early stage. Methods: A total of 79 individuals who underwent ISCT resection at our institute between 2014 and 2019 were enrolled in the study, whose preoperative walking state was independent ambulator regardless of cane support with the Functional Independence Measure Locomotor Scale (FIM-L) score of ≥6. The FIM-L, the American Spinal Injury Association (ASIA) motor and sensory scores in the lower extremities, and the Walking Index for Spinal Cord Injury II (WISCI II) were assessed for walking independence, lower-limb function, and walking ability, respectively. These evaluations were performed at 4 time points: preoperatively, 1 week (1W), 2 weeks (2W), and 1 year after surgery.Results: In the early phase after surgery, 71% and 43% of the participants were nonindependent ambulators at 1W and 2W, respectively. Histopathology indicated that patients with solid tumors (ependymoma, astrocytoma, or lipoma) showed significantly lower indices at 1W and 2W than those with vascular tumors (hemangioblastoma or cavernous hemangioma). Regarding tumor location, thoracic cases exhibited poorer lower-limb function at 1W and 2W and poorer walking ability at 2W than cervical cases. According to the receiver operating characteristic (ROC) analysis, 2 WISCI II points at 2W had the highest sensitivity (100%) and specificity (92.2%) in predicting the level of walking independence at 1 year postoperatively (the area under the ROC curve was 0.99 (95% confidence interval, 0.93–1.00).Conclusions: The higher the lower-limb function scores in the early phase, the better the improvement in walking ability is predicted 1 year after ISCT resection.
Tetsuya Kojima,Toshihiko Takauchi,Toshifumi Ise,Isao Iyoda,Hiroyuki Sasao,Yoshiyuki Kono,Koji Temma,Nobuyoshi Inoue,Akira Kawamoto 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
A new parallel type voltage sag compensator is proposed. The proposed system can reduce the necessary capacity of a storage capacitor for voltage sag compensation by boost type power factor correction rectifier getting charging energy from residual voltage of utilities as it compensates the load voltage. This paper shows principle and control system of the proposed circuit. Compensation<br/> performances are demonstrated by experiments.
Tetsuya Magara 한국천문학회 2017 Journal of The Korean Astronomical Society Vol.50 No.6
We present a new method for solving an inverse problem of flux emergence which transports subsurface magnetic flux from an inaccessible interior to the surface where magnetic structures may be observed to form, such as solar active regions. To make a quantitative evaluation of magnetic structures having various characteristics, we derive physical properties of subsurface magnetic field that characterize those structures formed through flux emergence. The derivation is performed by inversion from an evolutionary relation between two observables obtained at the surface, emerged magnetic flux and injected magnetic helicity, the former of which provides scale information while the latter represents the configuration of magnetic field.
Modeling and Stabilization of Motorcycle Shimmy
Tetsuya Kubota,Eiichi Yagi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
It is known that in some conditions, shimmy phenomenon occurs on motorcycles. In this article, shimmy analysis is conducted by the model based on the tire model that delivers the force with lateral deformation. The analysis shows that the motorcycle with excessively heavy load becomes unstable. Then, the model is used to design a stabilizing controller for motorcycle shimmy. The stabilization is verified by the experiment with the unmanned motorcycle produced for the tests without a rider influence. The results show the control based on the model is effectiveto stabilize motorcycle shimmy.
Use of Imaging Agent to Determine Postoperative Indwelling Epidural Catheter Position
( Tetsuya Uchino ),( Satoshi Hagiwara ),( Hideo Iwasaka ),( Kyosuke Kudo ),( Junji Takatani ),( Akio Mizutani ),( Masahiro Miura ),( Takayuki Noguchi ) 대한통증학회 2010 The Korean Journal of Pain Vol.23 No.4
Background: Epidural anesthesia is widely used to provide pain relief, whether for surgical anesthesia, postoperative analgesia, treatment of chronic pain, or to facilitate painless childbirth. In many cases, however, the epidural catheter is inserted blindly and the indwelling catheter position is almost always uncertain. Methods: In this study, the loss-of-resistance technique was used and an imaging agent was injected through the indwelling epidural anesthesia catheter to confirm the position of its tip and examine the migration rate. Study subjects were patients scheduled to undergo surgery using general anesthesia combined with epidural anesthesia. Placement of the epidural catheter was confirmed postoperatively by injection of an imaging agent and X-ray imaging. Results: The indwelling epidural catheter was placed between upper thoracic vertebrae (n = 83; incorrect placement, n = 5), lower thoracic vertebrae (n = 123; incorrect placement, n = 5), and lower thoracic vertebra-lumbar vertebra (n = 46; incorrect placement, n = 7). In this study, a relatively high frequency of incorrectly placed epidural catheters using the loss-of-resistance technique was observed, and it was found that incorrect catheter placement resulted in inadequate analgesia during surgery. Conclusions: Although the loss-of-resistance technique is easy and convenient as a method for epidural catheter placement, it frequently results in inadequate placement of epidural catheters. Care should be taken when performing this procedure. (Korean J Pain 2010; 23: 247-253)