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Hiroshi Yoshizumi,Tatsuya Yamada,Kouki Matsuse,Kiyoaki Sasagawa 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The purpose of this work is to find out performance of speed sensorless direct-field-orientecl controlled induction motor operating in very low speed region using adaptive flux observer. We discuss on the effect of the characteristic of A/D converter to estimated motor speed in this control system by simulation.
Security Technologies, Usage and Guidelines in SCADA System Networks
Mai Kiuchi,Yoshizumi Serizawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The use of off-the-shelf IT systems in SCADA systems has increased, resulting in higher usability at a lower cost. This has introduced a higher risk from cyber threats. As many SCADA systems play an important role in infra-structure and industrial systems, it is important to maintain reliability and security. However, applying cyber security measures should not interfere with the functionality of the SCADA system. We used a model SCADA system to assess various security measures deployed in the system. In addition, standards and guidelines will become more important for selecting appropriate security.
Hiroshi Kanno,Tetsuya Yoshizumi,Naomi Nakazato,Masamichi Shinonaga 대한신경과학회 2020 Journal of Clinical Neurology Vol.16 No.1
Background and Purpose An epidural blood patch (EBP) is a highly effective therapy for spinal cerebrospinal fluid (CSF) leakage. However, the factors predicting the response to an EBP have not been fully elucidated. The aim of this study was to elucidate factors predicting the response to an EBP. Methods We retrospectively examined the relationship between the response to an EBP and clinical variables of 118 patients with spinal CSF leakage, such as patient age, sex, etiology, interval from the onset to EBP application, CSF opening pressure (OP), radioisotope (RI) cisternography findings, rate of RI remaining in the CSF space, computed tomography (CT) myelography findings, magnetic resonance imaging (MRI) findings, and subjective symptoms (headache, vertigo/dizziness, visual disturbance, nausea, numbness, nuchal pain, back pain/lumbago, fatigability, photophobia, and memory disturbance). The correlations between these variables and the responses to EBPs were analyzed statistically. Results A positive response to an EBP was significantly (p<0.05) correlated with the following variables: <1.5 years from the onset to EBP application, age <40 years, CSF OP <7 cm H2O, epidural CSF leakage in RI cisternography, epidural CSF collection in MRI, <20% RI remaining after 24 hours, orthostatic headache, nausea, nuchal pain, and photophobia. The other variables did not show significant correlations with the responses to EBPs. Conclusions It might be prudent to take the following variables into account when applying an EBP to treat spinal CSF leakage: the interval from the onset to EBP application, age, CSF OP, epidural CSF leakage in RI, epidural CSF collection in MRI, rate of remaining RI, orthostatic headache, nuchal pain, photophobia, and nausea.