| 2 | Distributed dynamic pricing based on demand-supply balance and voltage phase difference in power grid显示文摘This paper discusses a distributed decision procedure for determining the electricity price for a real-time electricity market in an energy management system. The price decision algorithm proposed in this paper derives the optimal electricity price while considering the constraints of a linearized AC power grid model. The algorithm is based on the power demand-supply balance and voltage phase differences in a power grid. In order to determine the optimal price that maximizes the social welfare distributively and to improve the convergence speed of the algorithm, the proposed algorithm updates the price through the alternating decision making of market participants. In this paper, we show the convergence of the price derived from our proposed algorithm. Furthermore, numerical simulation results show that the proposed dynamic pricing methodology is effective and that there is an improvement in the convergence speed, as compared with the conventional method. | Yoshihiro OKAWA Toru NAMERIKAWA | 2015 | Control Theory and Technology2015，13，2： | 0 |
| 3 | The liver-to-spleen ratio is a risk factor predicting oxygen demand in COVID-19 patients显示文摘Background:We aimed to investigate risk factors predicting oxygen demand in COVID-19 patients.Methods:Patients admitted to Shizuoka General Hospital with COVID-19 from August 2020 to August 2021 were included.First,we divided patients into groups with and without oxygen demand.Then,we compared patients’clinical characteristics and laboratory and radiological findings to determine factors predicting oxygen demand.Results:One hundred seventy patients with COVID-19(aged 58±15 years,57 females)were enrolled.Common comorbidities were cardiovascular diseases(47.6%),diabetes mellitus(28.8%),and dyslipidemia(26.5%).Elder age,higher body mass index,cardiovascular diseases,diabetes mellitus,lower lymphocyte count,albumin,hep-atic attenuation value,and the liver-to-spleen ratio(L/S),higher D-dimer,aspartate aminotransferase,lactate dehydrogenase,troponin-T,C-reactive protein,KL-6,chest and abdominal circumference,and visceral fat were found in patients with oxygen demand.According to the multivariate logistic regression analysis,L/S,lympho-cyte count,D-dimer,and abdominal circumference under the diaphragm were independent risk factors predicting oxygen demand in COVID-19 patients.Conclusions:On admission,L/S,lymphocyte count,D-dimer,and abdominal circumference were predictive factors for oxygen demand.These factors may help in the appropriate triage of COVID-19 patients in the decision to admit them to the hospital. | Hiromasa Nakayasu Shogo Sakurai Shuichi Sugiyama Kotaro Shiratori Kohei Okawa Yoshihiro Kitahara Shingo Takahashi Toshihiro Masuda Yutaro Kishimoto Mika Saigusa Akito Yamamoto Taisuke Akamatsu Satoru Morita Kazuhiro Asada Toshihiro Shirai | 2023 | Infectious Medicine2023，2，2： | 0 |
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