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Complete Analysis of Steady-State and Efficiency Considerations in a Forward-Flyback Mixed Converter
Yoshito Kusuhara,Tamotsu Ninomiya,Asahi Nakayama,Shin Nakagawa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel DC-DC converter where both forward and Flyback actions are mixed. Previously, we proposed this converter that has prominent features of reducing the voltage of main switch and the current ripple of output inductor, and as a result, the high efficiency and the size reduction were obtained as reported in the previous paper. And, this paper presents that this converter has four operation modes when the turns ratio of the second and the third windings of the transformer is set to be a certain value. Furthermore, these operation modes are analyzed through the extended state-space averaging method, and are confirmed by simulation. These characteristics are shown by means of a three-dimensional graphics method. This paper presents the detailed analyses of static characteristics for the four operation mode used three-dimensional expression of load characteristics with another winding turns ratio by the extended state-space averaging method.
Yoshito Tanaka,윤소남,YutakaTanaka 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
This study developed a rehabilitation system that can improve the patient care services provided by physical therapists. Wristparalyzedpatients were given arbitrary force through a six-degree of freedom (6DoF) parallel mechanism composed of six pneumaticcylinders, and recovery training was performed. Each pneumatic cylinder was used to apply force control using a pulse width modulationcontrol, and the force of the 6DoF direction was directed to the wrist of the patient. The thrust force of each cylinder and the force of the6DoF direction of the parallel mechanism were analyzed. The analysis results conformed well to the experimental results. The developedrehabilitation system was designed to help a physical therapist remotely treat multiple patients at the same time. To monitor the operationof the parallel mechanism of each patient’s side, a 3D computer graphic model was created through OpenGL. The movement of thismodel was investigated to further examine the movement of the 6DoF direction of the parallel mechanism. Results confirmed that bothmovements can be controlled synchronously.
Adaptive Responses to Electrophilic Stress and Reactive Sulfur Species as their Regulator Molecules
Yoshito Kumagai,Masahiro Akiyama,Takamitsu Unoki 한국독성학회 2019 Toxicological Research Vol.35 No.4
We are exposed to numerous xenobiotic electrophiles on a daily basis through the environment, lifestyle, and dietary habits. Although such reactive species have been associated with detrimental effects, recent accumulated evidence indicates that xenobiotic electrophiles appear to act as signaling molecules. In this review, we introduce our findings on 1) activation of various redox signaling pathways involved in cell proliferation, detoxification/ excretion of electrophiles, quality control of cellular proteins, and cell survival during exposure to xenobiotic electrophiles at low concentrations through covalent modification of thiol groups in sensor proteins, and 2) negative regulation of reactive sulfur species (RSS) in the modulation of redox signaling and toxicity caused by xenobiotic electrophiles.