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Kazuhiro Shiraishi,Koki Ogura,Mantaro Nakamura,Yuma Fujii,Eiji Hiraki,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents an advanced circuit topology and optimum gate pulse patterns for the voltage source bridge type soft-switching(S-SW) sinewave PWM inverter, which incorporates a novel active auxiliary bridge commutation leg, associated quasi-resonant snubbers. In this voltage source type sinewave PWM inverter, all the main power switches and the auxiliary power switches can achieve the zero voltage soft-switching (ZVS) or the zero current soft-switching (ZCS). The complete S-SW commutation is possible only by determining the gate pulse pattern timing of the main switches and the auxiliary switches, and circuit parameters. The special resonant current and the current and voltage sensor control circuit to achieve S-SW commutation are not necessary for<br/> these resonant snubbers. In addition, the optimum gate pulse pattern to minimize the power losses of the resonant snubber treated here.
Yagi Sen,Furukawa Shinya,Shiraishi Kana,Miyake Teruki,Tange Kazuhiro,Hashimoto Yu,Kitahata Shogo,Kawamura Tomoe,Ninomiya Tomoyuki,Mori Kenichirou,Suzuki Seiyuu,Shibata Naozumi,Murakami Hidehiro,Ohashi 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.2
Purpose: The albumin-to-globulin ratio (AGR) is a recognized chronic inflammation marker. No evidence regarding the relationship between AGR level and ulcerative colitis (UC) exists. The aim of this study was to evaluate the association between AGR and clinical outcomes among Japanese subjects with UC. Methods: The study subjects consisted of 273 Japanese individuals with UC. AGR was divided into 4 categories (low, moderate, high, and very high). The definition of complete mucosal healing (MH) was based on the Mayo endoscopic subscore of 0. Clinical remission (CR) was defined as no rectal bleeding and no abnormally high stool frequency (<3 times per day). Results: The percentage of MH was 26.4%. High AGR and very high AGR were significantly positively correlated with CR (adjusted odds ratio [OR], 5.85; 95% confidence interval [CI], 2.52–14.18 and adjusted OR, 4.97; 95% CI, 2.14–12.04) and complete MH (adjusted OR, 4.03; 95% CI, 1.56–11.51 and adjusted OR, 5.22; 95% CI, 1.97–14.89), respectively after adjustment for confounding factors (P for trend=0.001). Only in the low C-reactive protein (CRP) group (≤0.1 mg/dL), very high AGR was significantly positively correlated with complete MH but not CR (adjusted OR, 4.38; 95% CI, 1.06–21.77; P for trend=0.017). In the high CRP group, no correlation between AGR and complete MH was found. Conclusion: Among Japanese patients with UC, AGR may be independently positively correlated with complete MH. In particular, among UC patients with low CRP, AGR might be a useful complementary marker for complete MH.
Hisashi Iyomori,Shin-ichiro Nagai,Kazuhiro Shiraishi,Tarek Ahmed,Hiraki Eiji,Nakoka Mutsuo 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Abstract: This paper presents a novel prototype of the three~phase bridge power block module type auxiliary resonant AC link snubber circuit, which is effectively used for the three-phase voltage source type sinwave soft switching PWM inverter lising IGBTs Its operating principle is described for current source load model, along with its practical design approach based on the simulation data The performance evaluations of the three-phase voltage source type sinewave soft switching PWM inverter incorpoiating a single three-phase bridge module of active auxiliary resonant AC link snubber treated here is illustrated, which is concerned with power quality efficiency power loss analysLs This inverter is discussed a compared with those of the three-phase voltage source type sinewave hard switching PWM inverter The power loss analysis of this soft switching PWM inverter using IGBT power modules is evaluated on the basis of the measured V-I characteristics and switching power losses of IOBT, and antiparallel diodes The practical effectiveness of this inverter is proven by the power loss analysis for distributed power supply<br/>