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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.
A New Broadcast Method to Prevent Packet Collisions over Biased Terminal Arrangement
Tetsuya Shigeyasu,Hiroshi Matsuno,Shozo Komaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
IEEE802.11DCF is widely used wireless LAN standard. But, packet delivery ratio of broadcast transmission is much lower than unicast transmission because the IEEE802.11DCF executes broadcast transmission without RTS/CTS exchange and ACK process. Hence, many protocols have been proposed to improve reliability of the broadcast transmission. Most of these protocols are proposed based on collision recovery policy using ACK signal or NACK signal instead of ACK frame. Then, transmission overhead is increased by retransmission under the condition that network contains some hidden terminals since ACK or NACK signal could not prevent transmission of hidden terminals. This paper proposes a new broadcast protocol based on collision prevention policy using modified RTS/CTS exchange, and clarifies that our proposed protocol achieved highly reliability even in the biased and nobiased distributed terminals arrangement.
Human-Robot Interface Using System Request Utterance Detection Based on Acoustic Features
Tetsuya Takiguchi,Tomoyuki Yamagata,Atsushi Sako,Nobuyuki Miyake,Jerome Revaud,Yasuo Ariki 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.3
For a mobile robot to serve people in actual environments, such as a living room or a party room, it must be easy to control because some users might not even be capable of operating a computer keyboard. For non-expert users, speech recognition is one of the most effective communication tools when it comes to a hands-free (human-robot) interface. This paper describes a new mobile robot with hands-free speech recognition. For a hands-free speech interface, it is important to detect commands for a robot in spontaneous utterances. Our system can understand whether user’s utterances are commands for the robot or not, where commands are discriminated from humanhuman conversations by acoustic features. Then the robot can move according to the user’s voice (command). In order to capture the user’s voice only, a robust voice detection system with AdaBoost is also described.
Dynamic Formation and Associated Heating of a Magnetic Loop on the Sun
Tetsuya Magara,장연우,손동휘 한국천문학회 2022 Journal of The Korean Astronomical Society Vol.55 No.6
To seek an atmospheric heating mechanism operating on the Sun we investigated a heating source generated by a downflow, both of which may arise in a magnetic loop dynamically formed on the Sun via flux emergence. Since an observation shows that the illumination of evolving magnetic loops under the dynamic formation occurs sporadically and intermittently, we performed a magnetohydrodynamic simulation of flux emergence to obtain a high-cadence simulated data, where temperature enhancement was identified at the footpoint of an evolving magnetic loop. Unlike a rigid magnetic loop with a confined flow in it, the evolving loop in a low plasma $\beta$ atmosphere is subjected to local compression by the magnetic field surrounding the loop, which drives a strong supersonic downflow generating an effective footpoint heating source in it. This may introduce an energy conversion system to the magnetized atmosphere of the Sun, in which the free magnetic energy causing the compression via Lorentz force is converted to the flow energy, and eventually reduced to the thermal energy. Dynamic and thermodynamic states involved in the system are explained.
Tetsuya Sato,Kazunari Morimoto,Kazuko Sakamoto,Saori Kitaguchi,Kanji Kajiwara,John H Xin,Aran Hansuebsai,Suchitra Sueeprasan,James Nobbs,Kang Koo,Samsoo Kim,Soonjee Park,Josep Valldeperas,Mane I Lis 한국색채학회 2011 한국색채학회 학술대회 Vol.2011 No.10
Colours in our daily life give us impressions and induce various emotions. The emotions induced from the colour are made in our brain, and the colour emotions are greatly influenced by consciousness. It is difficult to know the level of the colour emotions. In our studies, some numerical expression of the colour emotions including seasonal colours has been tried. As colours induce our emotions, the colours influence human activities and behaviours. Recently, "colour marketing" relating to consumers" purchase motivations has been paid the attention. We investigated some influences of colour to the consumers" purchase motivation through some questionnaire surveys. This paper was summarized the cross-cultural comparison of colour emotion and its numerical expression, in addition, also summarized the influence of colour to the consumers" purchase motivation, with using some published papers of our previous studies.