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Yamamoto, Tetsuya,Yamamitsu, Fuminori,Sonoda, Toshikatsu The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.3
In recent years there has been increasing demand for the development of new "green" energy sources. Wind power generated using a self-excited induction generator has a drawback in that generated voltage varies with wind velocity. The authors first proposed the use of a single-phase magnetic flux controlled type variable reactor, and developed a system using three such reactors to achieve voltage control of an induction generator. The newly developed three-phase magnetic flux controlled type variable reactor was used to control the voltage of the induction generator. The authors have used an external power source (commercial power) for the voltage control source, and this approach would not be appropriate for use in remote locations. In the system described in this paper, however, a self-sufficient design was adopted that draws power required for voltage control from the generated power.
Current Treatment Strategy for Superficial Nonampullary Duodenal Epithelial Tumors
Tetsuya Suwa,Kohei Takizawa,Noboru Kawata,Masao Yoshida,Yohei Yabuuchi,Yoichi Yamamoto,Hiroyuki Ono 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.1
Endoscopic submucosal dissection (ESD) is the standard treatment method for esophageal, gastric, and colorectal cancers. However,it has not been standardized for duodenal lesions because of its high complication rates. Recently, minimally invasive and simplemethods such as cold snare polypectomy and underwater endoscopic mucosal resection have been utilized more for superficialnonampullary duodenal epithelial tumors (SNADETs). Although the rate of complications associated with duodenal ESD has beengradually decreasing because of technical advancements, performing ESD for all SNADETs is unnecessary. As such, the appropriatetreatment plan for SNADETs should be chosen according to the lesion type, patient condition, and endoscopist’s skill.
Morimoto, Tetsuya,Yamamoto, Koji,Ogihara, Shinji The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.3
The single-modal Weibull model has been assessed on Tyranno ZMI Si-Zr-C-O fiber if a set of shape and scale parameters accurately reproduced the effect of the size of the diameter on strength. The tensile data of a single fiber have been divided into two expedient groups as 'small diameter' group and 'large diameter' group in deriving the parameters, which should be consistent if the Weibull model accurately reproduced the size effect. However, the derived Weibull parameters were inconsistent between the two groups. Thereby the authors have concluded that the parameters of the single-modal Weibull model are dependent on the fiber diameter, so that the model is inadequate to reproduce the strength size effect. On the other hand, Weibull parameters were found consistent between the two groups by excluding the data of 'large mirror zone' sample, which was defined as the sample around 10% mirror zone area of the fracture surface. What is more, the exclusion reduced the strength variance more drastically in the 'large diameter' group than in the 'small diameter' group, even though the 'large mirror zone' samples were found identical in the percentage between the two groups. The authors therefore conclude that diameter limitation to the 'small diameter' group level can lead to drastically less distributed strength values than the estimated strength through the Weibull scaling on the present Tyranno ZMI Si-Zr-C-O fiber.
Beamline Automation of RIKEN Structural Genomics Beamlines
Ida, Koh,Yamamoto, Masaki,Kumasaka, Takashi,Ueno, Go,Kanda, Hiroyuki,Miyano, Masashi,Ishikawa, Tetsuya Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
RIKEN Structural Genomics Beamlines have been constructed for the crystallographic analysis in the structural genomics research at synchrotron radiation facility SPring-8. Synchrotron radiation accelerates the crystallographic analysis of protein structure. The target of the research and development is focused on the automatic beamline operation to maximize beamline efficiency. We are developing the sample management system, which is composed of the sample auto-changer and the database system, for high-throughput data collection. The sample management system and the beamline operating system make it possible to execute automatic data collection without any operators. The beamlines will be ready for user operation in autumn 2002. The concept of automatic beamline operation and the present status of RIKEN Structural Genomics Beamlines will be presented.
Matsuura Takumi,Yamamoto Tetsuya,Matsumoto Yoshiyuki,Itino Takao 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
We reconstructed Stomaphis phylogeny and analyzed evolutionary host-plant shifts. The molecular phylogeny revealed 23 well-supported lineages, each specialized to use specific host plant family, whilst host plants of Stomaphis aphids ranged across 6 orders, 11 families, 21 genera, and 28 species. This combination of high host specificity with evolutionarily distant host shifts is exceptional in herbivores. To explain this pattern, we propose one hypothesis among several possibilities: Stomaphis aphids are generalists with respect to the defensive chemicals produced by the plant, but specialists with respect to the stem surface structure of the host tree. This hypothesis predicts that tree taxa having stem surface structures preferred by Stomaphis would be used again and again by genetically distinct Stomaphis lineages. Consistent with this prediction, we found that different (occa sionally phylogenetically distant) Stomaphis lineages shared the same host plant genera such as Alnus and Betula. This result suggests that, in the course of their evolutionary history, Japanese Stomaphis aphids have repeatedly colonized a limited number of host plant genera.
An Automated System for Empirical Forecasting of Solar Flares and CMEs
박성홍,Park, Sung-Hong,Yamamoto, Tetsuya 한국천문학회 2012 天文學會報 Vol.37 No.2
Solar flares and coronal mass ejections (CMEs) are two major solar eruptive phenomena which can cause enormous economic and commercial losses: (1) flares are sudden, rapid, and intense brightenings from radio waves to Gamma-rays in the chromosphere and corona, and (2) CMEs are large-scale transient eruptions of magnetized plasma from the solar corona that propagate outward into interplanetary space. Most flares and CMEs occur in magnetically complicated solar active regions (ARs). Therefore, it is crucial to investigate magnetic fields in ARs and their temporal variations for understanding a precondition and a trigger mechanism related to flare/CME initiation. In this presentation, we will introduce an automated system for empirical forecasting of flares and CMEs in ARs using full-disk photospheric line-of-sight magnetogram data taken by the Helioseismic and Magnetic Imager (HMI) onboard the SDO.