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Domain Adaptation for Agricultural Image Recognition and Segmentation Using Category Maps
Kota Takahashi,Hirokazu Madokoro,Satoshi Yamamoto,Yo Nishimura,Stephanie Nix,Hanwool Woo,Takashi K. Saito,Kazuhito Sato 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Recognition accuracy obtained using deep learning drops precipitously when the training data are insufficient. This paper presents a data-expansion method for training of the transfer learning source domain. Using expanding images generated from weights on a category map as source data, we compared accuracies obtained from five derivative models and our previously reported method. Moreover, we obtained the result of domain adaptation between actual images and synthetic images using weights obtained during transfer learning. Based on those results, we verify whether the amount of training data can be expanded quantitatively and qualitatively. Experiment results obtained from two open benchmark datasets and our original benchmark dataset demonstrated that our proposed method outperforms the previous method under a guarantee of sufficient accuracy for the synthetic images.
Sato, Masanobu,Toshimoto, Kota,Tomaru, Atsuko,Yoshikado, Takashi,Tanaka, Yuta,Hisaka, Akihiro,Lee, Wooin,Sugiyama, Yuichi American Society for Pharmacology and Experimental 2018 Drug metabolism and disposition: the biological fa Vol.46 No.5
<P>Bosentan is a substrate of hepatic uptake transporter organic anion-transporting polypeptides (OATPs), and undergoes extensive hepatic metabolism by cytochrome P450 (P450), namely, CYP3A4 and CYP2C9. Several clinical investigations have reported a non-linear relationship between bosentan doses and its systemic exposure, which likely involves the saturation of OATP-mediated uptake, P450-mediated metabolism, or both in the liver. Yet, the underlying causes for the nonlinear bosentan pharmacokinetics are not fully delineated. To address this, we performed physiologically based pharmacokinetic (PBPK) modeling analyses for bosentan after its intravenous administration at different doses. As a bottom-up approach, PBPK modeling analyses were performed using in vitro kinetic parameters, other relevant parameters, and scaling factors. As top-down approaches, three different types of PBPK models that incorporate the saturation of hepatic uptake, metabolism, or both were compared. The prediction from the bottom-up approach (models 1 and 2) yielded blood bosentan concentration-time profiles and their systemic clearance values that were not in good agreement with the clinically observed data. From top-down approaches (models 3, 4, 5-1, and 5-2), the prediction accuracy was best only with the incorporation of the saturable hepatic uptake for bosentan. Taken together, the PBPK models for bosentan were successfully established, and the comparison of different PBPK-models identified the saturation of the hepatic uptake process as a major contributing factor for the nonlinear pharmacokinetics of bosentan.</P>
1MHz Variable Sampling Deadbeat Control for PM motor using FPGA
Asahi Kitada,Kota Miyata,Kota Tsuchiya,Hiroki Sato,Tomoki Yokoyama 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A new digital control method for permanent magnet synchronous motor based on deadbeat control using FPGA based hardware controller is proposed. Using the discrete time model of PMSM, the deadbeat control law is derived using a model inverse solution. The superior calculation capability of FPGA realize the ideal digital control feedback system without any sampling compensation method. The verification of the proposed method were carried out through simulations and experiments.
Junichi Ohya,Kota Miyoshi,Tomoaki Kitagawa,Yusuke Sato,Takamitsu Maehara,Yoji Mikami 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.4
Although several cases of a dumbbell tumor of thoracic nerve roots have been reported, reports on the surgical procedures for a dumbbell tumor of the first thoracic (T1) nerve root are rare. Surgeons should be cautious, especially when performing a surgical procedure for a dumbbell tumor of the T1 nerve root because the tumor is anatomically located adjacent to important organs and because the T1 nerve root composes the lower trunk of the brachial plexus with the eighth cervical nerve root. We present cases with dumbbell tumors of the T1 nerve root that were treated with combined surgical treatment to remove the tumor. We first performed videoassisted thoracic surgery (VATS) to release the organs anteriorly and then performed posterior spinal surgery in the prone position. The combined VATS and posterior spinal surgery may become a standard surgical procedure for the treatment of dumbbell tumors of the T1 nerve root.
Yasunori Yoshida,Harumi Takahashi,Hiroomi Kanda,Kazunori Okuyama,Kota Sato,Koki Kanahama 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.1
The effects of different gibberellin A3 (GA) concentrations on the development of main shoots and aerial and new tubers in the Japanese yam were examined in an unheated plastic house and open field. In the unheated plastic house, treatment with GA 25 (25 ㎎ · L?¹) or GA 200 (200 ㎎ · L?¹) promoted new tuber growth in the plants by inhibiting aerial tuber growth. Plants treated with GA 100 (100 ㎎ · L?¹) had the greatest fresh weight of new tubers among all GA treated plants. These effective GA concentrations showed similar results in Dioscorea oppositifolia ‘Ichoimo’ and ‘Nagaimo’ that were grown in the unheated plastic house. In the open field, although treatment with GA 25, GA 50 and GA100 promoted new tuber growth by inhibiting aerial tuber growth, the yield of new tubers decreased with increasing GA concentration. Furthermore, although GA inhibited aerial tuber growth, the fresh weight of new tubers after GA 200 treatment was almost equal to that of the GA 0- treated plants. The different effects of GA concentrations under unheated plastic house and open field conditions were due to the negative influence of GA treatment (it decreased the number of leaves on the shoots). In fact, the number of leaves on the shoots of plants grown in the unheated plastic house was significantly lower among GA 25-and GA 200-treated plants than those of GA 0-treated plants. This implies that GA had a negative effect on plants grown in the open field.