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- 저자 : Noriyuki Takada (검색결과 2 건)
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High Power Matrix Converter for Wind Power Generation Applications
Jun Kang,Noriyuki Takada,Eiji Yamamoto,Eiji Watanabe 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The matrix converter has many advantages in wind power system applications. Matrix converter is compact and highly efficient because it directly converts generated power from AC generator to AC grid without intermediate DC bus while conventional back-to-back converter systems requires many electrolytic capacitors in DC link bus which are bulky and have short life-time. Matrix converter has both motoring and regenerative power flows keeping low harmonics current in grid. It also can provide reactive power to the grid, which is important characteristic for wind farms to stabilize power system during and after grid failure. In this paper, high power matrix converter is introduced for wind power applications. Major technical features and advantages are described. Experimental results with a PM generator show good feasibility for the wind power applications.
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Yuki Fujii,Kazuyuki Matsumoto,Hironari Kato,Yosuke Saragai,Saimon Takada,Sho Mizukawa,Shinichiro Muro,Daisuke Uchida,Takeshi Tomoda,Shigeru Horiguchi,Noriyuki Tanaka,Hiroyuki Okada 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.5
Background/Aims: This study aimed to examine the diagnostic ability of endoscopic ultrasonography (EUS) for major vascularinvasion in pancreatic cancer and to evaluate the relationship between EUS findings and pathological distance. Methods: In total, 57 consecutive patients who underwent EUS for pancreatic cancer before surgery were retrospectively reviewed. EUSimage findings were divided into four types according to the relationship between the tumor and major vessel (types 1 and 2: invasion,types 3 and 4: non-invasion). We also compared the EUS findings and pathologically measured distances between the tumors andevaluated vessels. Results: The sensitivity, specificity, and accuracy of EUS diagnosis for vascular invasion were 89%, 92%, and 91%, respectively, in theveins and 83%, 94%, and 93%, respectively, in the arteries. The pathologically evaluated distances of cases with type 2 EUS findings weresignificantly shorter than those of cases with type 3 EUS findings in both the major veins (median [interquartile range], 96 [0–742] µmvs. 2,833 [1,076–5,694] µm, p=0.012) and arteries (623 [0–854] µm vs. 3,097 [1,396–6,000] µm, p=0.0061). All cases with a distance of≥1,000 µm between the tumors and main vessels were correctly diagnosed. Conclusions: Tumors at a distance ≥1,000 µm from the main vessels were correctly diagnosed by EUS.
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