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Nozawa, Tatsuhiro,Miyaguchi, Yuki,Hida, Yusuke,Koyanagi, Kaoru,Yokoyama, Ryuichi,Shirai, Goro 대한전기학회 2012 The Journal of International Council on Electrical Vol.2 No.1
This paper presents the effectiveness evaluation approach of demand side management (dema nd control) for frequency regulation in regional power networks (so called Cluster-oriented networks). The analytical model of the frequency fluctuation for a three-cluster interconnected network model was developed with MATLAB/SIMULINK. The control method is similar to the conventional TBC (Tie Line Bias Control) widely used in power grids. In order to maintain the quality of frequency, Battery Energy Storage Systems (BESS) and controllable loads such as heat pumps installed in the customer side will play an effective role in clusters. By the results of conducted simulations, it shows that the proposed new frequency regulation scheme by utilizing controllable loads such as battery charges and heat pumps retains effectiveness to suppress frequency deviation when a large amount of natural renewable energy is installed in the regional cluster-oriented networks.
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.
Shimizu, Ippei,Minamino, Tohru,Toko, Haruhiro,Okada, Sho,Ikeda, Hiroyuki,Yasuda, Noritaka,Tateno, Kaoru,Moriya, Junji,Yokoyama, Masataka,Nojima, Aika,Koh, Gou Young,Akazawa, Hiroshi,Shiojima, Ichiro,K American Society for Clinical Investigation 2010 The Journal of clinical investigation Vol.120 No.5