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Proposal of Dynamic Modeling of Distribution System with System Identification
Ryohei, Kawagishi,Yamanaka, Daisuke,Shirai, Yasuyuki The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3
In this study, a new method of building a dynamic load model for dynamic stability analysis was proposed. This method is as follows: First, inject some small electric power disturbance of known pattern to power system and measure the response in distribution system. Next, analyze the measured response using system identification and create the load model. Simulation was performed with PSCAD, and a dynamic load model was build and evaluated. In the simulation, the availability of the proposed method was confirmed. The model could reproduce the response of the stable system precisely. In addition to it, the stability of the system could evaluate with proposed method.
Hirotaka Hasegawa,Masahiro Shin,Jun Kawagishi,Hidefumi Jokura,Toshinori Hasegawa,Takenori Kato,Mariko Kawashima,Yuki Shinya,Hiroyuki Kenai,Takuya Kawabe,Manabu Sato,Toru Serizawa,Osamu Nagano,Kyoko Ao 대한뇌졸중학회 2022 Journal of stroke Vol.24 No.2
Background and Purpose To assess the long-term outcomes of intracranial dural arteriovenous fistula (DAVF) treated with stereotactic radiosurgery (SRS) alone or embolization and SRS (Emb- SRS) and to develop a grading system for predicting DAVF obliteration. Methods This multi-institutional retrospective study included 200 patients with DAVF treated with SRS or Emb-SRS. We investigated the long-term obliteration rate and obliteration-associated factors. We developed a new grading system to estimate the obliteration rate. Additionally, we compared the outcomes of SRS and Emb-SRS by using propensity score matching. Results The 3- and 4-year obliteration rates were 66.3% and 78.8%, respectively. The post-SRS hemorrhage rate was 2%. In the matched cohort, the SRS and Emb-SRS groups did not differ in the rates of obliteration (P=0.54) or post-SRS hemorrhage (P=0.50). In multivariable analysis, DAVF location and cortical venous reflux (CVR) were independently associated with obliteration. The new grading system assigned 2, 1, and 0 points to DAVFs in the anterior skull base or middle fossa, DAVFs with CVR or DAVFs in the superior sagittal sinus or tentorium, and DAVFs without these factors, respectively. Using the total points, patients were stratified into the highest (0 points), intermediate (1 point), or lowest (≥2 points) obliteration rate groups that exhibited 4-year obliteration rates of 94.4%, 71.3%, and 60.4%, respectively (P<0.01). Conclusions SRS-based therapy achieved DAVF obliteration in more than three-quarters of the patients at 4 years of age. Our grading system can stratify the obliteration rate and may guide physicians in treatment selection.
Ha-Yull Chung,Mi-Kyong Yoo,Hirokazu Kawagishi 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.3
Extract of water-soluble polysaccharide (CFWx), showing inhibiting activity on α-glucosidase, was prepared from the fruiting bodies of Cordyceps militaris by hot-water extraction, and ethanol precipitation. Chemical characteristics of CFWx were as follows: carbohydrate content 30% including 16% of uronic acid; 51% protein content; monosaccharide composition, Man:Glu:Gal (30:43:27); molecular weight 3-5×10⁴. CFWx was further purified by ion-exchange, gel-permeation, and affinity chromatography and CFWx-AH-α fraction was isolated. Fundamental structure of CFWx-AH-α was deduced as α-(1→4)-Dglucan with α-(1→3)- and/or α-(1→6)-D-glycosidic side chains based on methylation analysis.
Shohei Ooka,Kiyonori Kobayashi,Kana Kawagishi,Masaru Kodo,Kaoru Yokoyama,Miwa Sada,Satoshi Tanabe,Wasaburo Koizumi 대한소화기내시경학회 2016 Clinical Endoscopy Vol.49 No.1
Background/Aims: The diagnostic algorithms used for selecting patients with obscure gastrointestinal bleeding (OGIB) for capsule endoscopy (CE) or balloon-assisted enteroscopy (BE) vary among facilities. We aimed to demonstrate the appropriate selection criteria of CE and single balloon-assisted enteroscopy (SBE) for patients with OGIB according to their conditions, by retrospectively comparing the diagnostic performances of CE and BE for detecting the source of the OGIB. Methods: We investigated 194 patients who underwent CE and/or BE. The rate of positive findings, details of the findings, accidental symptoms, and hemostasis methods were examined and analyzed. Results: CE and SBE were performed in 103 and 91 patients, respectively, and 26 patients underwent both examinations. The rate of positive findings was significantly higher with SBE (73.6%) than with CE (47.5%, p<0.01). The rate of positive findings was higher in overt bleeding cases than in occult bleeding cases for both BE and SBE. Among the overt bleeding cases, the rate was significantly higher in ongoing bleeding cases than in previous bleeding cases. Conclusions: Both CE and SBE are useful to diagnose OGIB. For overt bleeding cases and ongoing bleeding cases, SBE may be more appropriate than CE because endoscopic diagnosis and treatment can be completed simultaneously.