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Yoshida, Yoshiaki,Fujiwara, Koji,Ishihara, Yoshiyuki,Suzuki, Hirokazu The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.1
When distributed generators such as photovoltaic (PV) systems spread widely in distribution networks, it is important to detect islanding caused by power system fault for ensuring electrical safety. We developed the nonlinear magnetizing characteristics model of a pole transformer for analyzing islanding-prevention of PV system. Basic experiments of the islanding-detection were conducted by using the RLC resonant circuit for verification of the developed model. Analytical results by the proposed model agreed well with experimental results.
Yoshida, Yoshiaki,Fujiwara, Koji,Ishihara, Yoshiyuki,Suzuki, Hirokazu Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
When large penetration of the distributed generators (DGs) such as photovoltaic (PV) systems is growing up in grid system, it is important to quickly prevent islanding caused by power system fault to ensure electrical safety. We propose a novel active method for islanding prevention by harmonic injection synchronized with the exciting current harmonics of the pole transformer to avoid mutual interference between active signals. We confirm the validity of the proposed method by performing the basic tests of islanding by using a current source superimposed the harmonic active signal. Further, we carry out the simulation using PSCAD/EMTDC, and verify the fast islanding detection.
Koji Nakada,Akitoshi Kimura,Kazuhiro Yoshida,Nobue Futawatari,Kazunari Misawa,Kuniaki Aridome,Yoshiyuki Fujiwara,Kazuaki Tanabe,Hirofumi Kawakubo,Atsushi Oshio,Yasuhiro Kodera 대한위암학회 2023 Journal of gastric cancer Vol.23 No.2
Purpose: This study aimed to examine the effects of 4 main types of gastrectomy for proximal gastric cancer on postoperative symptoms, living status, and quality of life (QOL) using the Postgastrectomy Syndrome Assessment Scale-45 (PGSAS-45). Materials and Methods: We surveyed 1,685 patients with upper one-third gastric cancer who underwent total gastrectomy (TG; n=1,020), proximal gastrectomy (PG; n=518), TG with jejunal pouch reconstruction (TGJP; n=93), or small remnant distal gastrectomy (SRDG; n=54). The 19 main outcome measures (MOMs) of the PGSAS-45 were compared using the analysis of means (ANOM), and the general QOL score was calculated for each gastrectomy type. Results: Patients who underwent TG experienced the lowest postoperative QOL. ANOM showed that 10 MOMs were worse in patients with TG. Four MOMs improved in patients with PG, while 1 worsened. One MOM was improved in patients with TGJP versus 8 MOMs in patients with SRDG. The general QOL scores were as follows: SRDG (+39 points), TGJP (+6 points), PG (+3 points), and TG (−1 point). Conclusions: The TG group experienced the greatest decline in postoperative QOL. SRDG and PG, which preserve part of the stomach without compromising curability, and TGJP, which is used when TG is required, enhance the postoperative QOL of patients with proximal gastric cancer. When selecting the optimal gastrectomy method, it is essential to understand the characteristics of each and actively incorporate guidance to improve postoperative QOL.
Ken Yoshida,Hideya Yamazaki,Satoaki Nakamura,Koji Masui,Tadayuki Kotsuma,Hironori Akiyama,Eiichi Tanaka,Nobuhiko Yoshikawa,Yasuo Uesugi,Taiju Shimbo,Yoshifumi Narumi,Yasuo Yoshioka 대한부인종양학회 2015 Journal of Gynecologic Oncology Vol.26 No.3
Objective: To assess actual rates of late vaginal stenosis and identify predisposing factors for complications among patients with previously untreated cervical cancer following high-dose-rate brachytherapy. Methods: We performed longitudinal analyses of 57 patients using the modified Dische score at 6, 12, 18, 24, 36, and 60 months after treatment, which consisted of 15 interstitial brachytherapys and 42 conventional intracavitary brachytherapys, with a median follow-up time of 36 months (range, 6 to 144 months). Results: More than half of the patients developed grade 1 (mild) vaginal stenosis within the first year of follow-up, and grade 2 (97.5%, moderate) to grade 3 (severe) stenosis gradually increased with time. Actual stenosis rates for grade 1, 2, and 3 were 97.5% (95% confidence interval [CI], 92.7 to 97.5), 60.7% (95% CI, 42.2 to 79.3), and 7.4% (95% CI, 0 to 18.4) at 3 years after treatment. Pallor reaction grade 2–3 at 6 months was only a statistically significant predisposing factor for grade 2–3 late vaginal stenosis 3 years or later with a hazard ratio of 3.48 (95% CI, 1.32 to 9.19; p=0.018) by a multivariate Cox proportional hazard model. Patients with grade 0–1 pallor reaction at 6 months showed a grade ≥2 vaginal stenosis rate of 53%, whereas the grade 2–3 pallor reaction group achieved a grade ≥2 vaginal stenosis rate at 3 years at 100% (p=0.001). Conclusion: High-dose-rate brachytherapy was associated with high incidence of late vaginal stenosis. Pallor reaction grade 2–3 at 6 months was predictive of late grade 2–3 vaginal stenosis at 3 years after treatment. These findings should prove helpful for patient counseling and preventive intervention.
Selection of appropriate terms for a subjective evaluation of video game contents
Junji Yoshida,Koji Iwasaki,Eishiro Kunikane,Hiroshi Hasegawa,Masao Kasuga 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This study investigated appropriate evaluation terms representing video game characteristics. First, many terms for evaluating video games were collected from game magazines and user questionnaires. Next, an experiment of video game evaluation, in which experimental subjects evaluated the game characteristics after playing 20 video games, were performed for extracting the appropriate evaluation terms. As a result, six kinds of evaluation terms of ”innovative,” ”fantasy,” ”length of waiting time,” ”reality,” ”comical,” and ”enjoyable with many people” were selected as the appropriate evaluation terms for video games using statistical analysis.
Naoki Yoshida,Hisashi Yamamoto,Tomoaki Akiba,Koji Shingyochi,Xiao Xiao 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
In the multi-state consecutive-k-out-of-n:F system, both the components and the system are allowed to be in M + 1 possible state. One of the most important problems in the multi-state consecutive-k-out-of-n:F system is the optimal arrangement problem wherein the solution is obtained by the arrangement of components with maximum expectation of system states. In general, the optimal arrangements depend on the values of component state probabilities. It is known, however, that for some cases, optimal arrangements do not depend on the values of component state probabilities but on the magnitude relationships of component state probabilities. In this paper, we investigate characteristics of optimal arrangements in multi-state consecutive-k-out-of-n:F systems. We propose characteristics of invariable optimal arrangement on some conditions.