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Toshihiko Yamada 한국과학학술지편집인협의회 2015 Science Editing Vol.2 No.1
In Japan, most scholarly journals have been published by scientific societies as in other Asian countries. In those days, Japanese and English language articles were commonly found within the same issue of an academic journal published by scientific societies. Many societies of natural sciences started to publish separate periodicals of international journals with an English version and a domestic Japanese version 20 years ago due to the internationalization of the scientific community. The Japanese Society of Grassland Science has also published both an international journal called Grassland Science and a domestic journal called Japanese Journal of Grassland Science (Nihon Sochigakkai Shi) since 2005. The first impact factor for Grassland Science was announced in 2013. International foreign handling editors represent more than half of all handling editors covering the world. Thus, recently, the number of submissions from foreign countries, especially from China, has drastically increased. With the increase in submissions, it becomes difficult to edit a journal professionally because the editors are generally professors in universities and scientists in national institutes who work as part-time volunteer editors and have been changed frequently. The decrease in the number of members is also a serious problem in many societies of agriculture sciences. The construction of an Asian network for scientific information may be one direction in the near future. Additionally, it is be necessary to change to open access journals in order to stabilize the publishing management of the journals.
Masaya Akase,Hiroaki Yamada,Toshihiko Tanaka,Ryo Okawachi,Kiyoshi Ochi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a simple current-ripple calculation on the source side of the LCL filter for three-phase pulse width modulated (PWM) rectifiers and the parallel-connected PWM rectifiers. Per-phase-base equivalent-circuits of the LCL filter for PWM rectifiers and parallel-connected three-phase PWM rectifiers are derived theoretically. The transfer function between the output voltages of three-phase PWM rectifiers and parallel-connected three-phase PWM rectifiers and the sourceside ripple currents is derived using the superposition principle, and then Bode plots are drawn. Then, the amplitude ratio of source-side harmonic currents to the output voltages of threephase PWM rectifiers and the parallel-connected three-phase PWM rectifiers is easily calculated from the Bode plots. A digital computer simulation is implemented to confirm the validity and high practicability of the proposed current-ripple calculation of LCL filter using PSIM software. Simulation results demonstrate that the current-ripple calculated with the Bode plots agrees well with the simulation results. It is, therefore, concluded that the proposed current-ripple calculation of the LCL filter is useful for three-phase PWM rectifiers and parallel-connected three-phase PWM rectifiers.
High-frequency Induction Heating for Tiny Foreign Metals
Shinya Kurachi,Naoki Yamamoto,Hiroaki Yamada,Toshihiko Tanaka,Eiji Hiraki,Yukiharu Yamada,Tatsuya Nagao,Yasuhiro Miyake,Yujiro Noda 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The anxiety of tiny metal contamination into resin materials in the manufacturing process has become one of the serious issues. Because it may often cause of overheat in lithium-ion batteries, flat panel displays, and so on. Therefore, a study on detecting method of the tiny metals is a significant issue. The authors have been investigating the high-frequency induction heating (IH) based approach for tiny metals detection. In this paper, effective magnetic circuit design and IH conditions are discussed and demonstrated from theoretical and experimental point of view.
Fuka Ikeda,Yuki Okamoto,Kei Nishikawa,Hiroaki Yamada,Masayuki Okamoto,Toshihiko Tanaka 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a sinusoidal chargingdischarging method of the lithium-ion batteries (LiBs) to reduce the capacitances of the dc-capacitors in the previously proposed smart charger (SC) for electric vehicles (EVs) in single-phase three-wire distribution feeders with power quality compensator. The dc-capacitor current in the three-leg pulse-width-modulated (PWM) rectifier is detected, and then added to the reference value for the output current of the bidirectional dc-dc converter that is used to charge or discharge the LiBs. The addition of the detected dc-capacitor current to the reference value of the bidirectional dc-dc converter achieves the sinusoidal chargingand discharging-operations of the LiBs in EVs. The sinusoidal charging- and discharging-operations sink the voltage ripples in the dc-capacitors of both the PWM rectifier and bidirectional dc-dc converter in the SC. This achieves the substantial reduced dc-capacitors in the SC. The simulation results demonstrate that balanced and sinusoidal source currents with a unity power factor can be achieved reducing the capacitances of dc-capacitors in the SC.
Koji Akeda,Kohshi Ohishi,Koichi Masuda,Won C. Bae,Norihiko Takegami,Junichi Yamada,Tomoki Nakamura,Toshihiko Sakakibara,Yuichi Kasai,Akihiro Sudo 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
Study Design: Preliminary clinical trial. Purpose: To determine the safety and initial efficacy of intradiscal injection of autologous platelet-rich plasma (PRP) releasate in patients with discogenic low back pain. Overview of Literature: PRP, which is comprised of autologous growth factors and cytokines, has been widely used in the clinical setting for tissue regeneration and repair. PRP has been shown in vitro and in vivo to potentially stimulate intervertebral disc matrix metabolism. Methods: Inclusion criteria for this study included chronic low back pain without leg pain for more than 3 months; one or more lumbar discs (L3/L4 to L5/S1) with evidence of degeneration, as indicated via magnetic resonance imaging (MRI); and at least one symptomatic disc, confirmed using standardized provocative discography. PRP releasate, isolated from clotted PRP, was injected into the center of the nucleus pulposus. Outcome measures included the use of a visual analog scale (VAS) and the Roland-Morris Disability Questionnaire (RDQ), as well as X-ray and MRI (T2-quantification). Results: Data were analyzed from 14 patients (8 men and 6 women; mean age, 33.8 years). The average follow-up period was 10 months. Following treatment, no patient experienced adverse events or significant narrowing of disc height. The mean pain scores before treatment (VAS, 7.5±1.3; RDQ, 12.6±4.1) were significantly decreased at one month, and this was generally sustained throughout the observation period (6 months after treatment: VAS, 3.2±2.4, RDQ; 3.6±4.5 and 12 months: VAS, 2.9±2.8; RDQ, 2.8±3.9; p <0.01, respectively). The mean T2 values did not significantly change after treatment. Conclusions: We demonstrated that intradiscal injection of autologous PRP releasate in patients with low back pain was safe, with no adverse events observed during follow-up. Future randomized controlled clinical studies should be performed to systematically evaluate the effects of this therapy.
Evaluation of operational characteristics of vertical type incinerator
( Kohei Yamanaka ),( In-hee Hwang ),( Takayuki Matsuo ),( Yasumasa Tojo ),( Toshihiko Matsuto ),( Yuji Yamada ),( Ryoji Sameshima ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Vertical type incinerator is one of unique incinerators. Wastes are fed at the hopper of upper side of reactor and slowly flow the bottom where the bottom ash is withdrawn. Combustion air less than theoretical one is injected through the bottom of furnace. In their downward movement, the wastes undergo the following process such as drying, pyrolysis, and combustion. Combustible gas that is generated in pyrolysis zone and moves to upward which is burned efficiently in the combustion chamber by supplying sufficient secondary combustion air. As advantages of vertical type incinerator, there are high responsiveness to diverse wastes, high combustion efficiency, and less generation of exhaust gas compared with a conventional stoker type incinerator. However, the utilization record of the vertical type incinerator is few, so there is not enough information to evaluate its operation performance from the engineering point of view. In this work, it aimed at elucidating the material and energy balance, combustion stability, and environmental safety for operating two vertical type incinerators. Annual discharge amounts of exhaust gas and ash, consumption amounts of fuel and electric power, and utilization amounts of chemicals such as slaked lime and activated carbon of per ton of waste were determined based on annual reports obtained from two facilities in Nagayo (54t/d) and Ito (42t/d) respectively. These values were compared with statistical data obtained from questionnaire survey on conventional incinerators performed in 2012 and 2015. For confirmation of combustion characteristics of waste in furnace, vertical distributions of gas concentration and total carbon in the waste layer were measured. To evaluate whether the waste incineration is done stable or not, continuous monitoring data of carbon monoxide concentration in flue gas was obtained. Moreover, bottom ashes were sampled for three days to measure ignition loss. On the other hand, daily average concentrations of harmful substances in exhaust gas such as NOx, SOx, CO, HCl, DXN at stack was also obtained. In the evaluation of discharge of exhaust gas and ash, consumption of fuel and electric power, and chemicals utilization, the surveyed two vertical incinerators showed above-average operational performance compared to conventional incinerators. From the variation of gas concentrations such as H<sub>2</sub>, CO, CO<sub>2</sub>, hydrocarbons in furnace, the vertical distribution of dry, pyrolysis, and char combustion zone was confirmed from the top to bottom of waste layer. Though it was found that 1 h moving average concentration of CO instantaneously sometimes exceeded 100 ppm in flue gas, its frequency was lower than that of conventional stoker type incinerator. However, there were relatively high Pb leaching samples in the leaching test of Pb and Cd of bottom ash. It is necessary to investigate whether it is the influence of the combustion characteristics of the vertical type incinerator.