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Power-Electronics Contributing to the Green and Clean World
Toshihiro Sawa,Tsuneo Kume,Hidenori Hara,Mahesh Swamy 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Invention of the electric motor has since, spurred its wide spread application to convert electrical energy in to mechanical work. As its usefulness grew, engineers were challenged to develop control techniques to match the speed and torque of the motor to that of the driven load to achieve optimal performance. The advent of Power Electronics was crucial in achieving variable speed operation of motors. Hence, it can be said that Power Electronics has contributed to the prosperity of today’s worldwide economy and allowed people to lead a joyous and peaceful life. However, at the same time, the amount of electrical energy consumed by electric motors accounts for the We have to be aware of this fact and its consequential influence on global warming. This paper discusses variable speed motors drives. It reviews Yaskawa’s contribution to industrial inverter drives and introduces a technology road map to realize a “Greener World” with all its future prospects.
( Hiroharu Kawakubo ),( Yuichiro Tanaka ),( Nanae Tsuruoka ),( Megumi Hara ),( Koji Yamamoto ),( Hidenori Hidaka ),( Yasuhisa Sakata ),( Ryo Shimoda ),( Ryuichi Iwakiri ),( Motoyasu Kusano ),( Kazuma 대한소화기기능성질환·운동학회 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.2
Background/Aims Upper gastrointestinal symptoms are more frequent and severe in female than in male outpatients in Japan. This study compared the upper gastrointestinal symptoms between healthy male and female young adult volunteers using a questionnaire. Methods In total, 581 third-grade medical students at Saga Medical School aged 22 to 30 years underwent upper gastrointestinal endoscopy and completed a questionnaire (frequency scale for symptoms of gastroesophageal reflux disease) from 2007 to 2013. Of these 581 students, 298 who were negative for Helicobacter pylori infection and had no particular lesions on endoscopic examination were enrolled in the present evaluation. A symptom was defined as positive when the subject evaluated the frequency of the symptom as sometimes, often, or always. Results The subjects comprised of 163 males (average age, 23.7 years) and 135 females (average age, 23.1 years). Upper gastrointestinal symptoms were more frequent in the females (75 of 135, 55.6%) than males (69 of 163, 42.3%; P < 0.05), with a high score for 4 symptoms (bloated stomach, heavy feeling in the stomach after meals, subconscious rubbing of the chest with the hand, and feeling of fullness while eating meals). Of the 144 subjects (69 males and 75 females) who complained of these symptoms, the females complained of dysmotility symptoms more often than did the males, but this was not true for reflux symptoms. Conclusions This study suggests that females develop upper gastrointestinal symptoms more frequently than do males among the young healthy Japanese population. (J Neurogastroenterol Motil 2016;22:248-253)