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Development of Low Voltage 2 Level IGBT Inverter and Converter for Industrial Applications
Tetsuya Okamoto,Yusuke Ishida,Yoshihito Kato,S. Miyazaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a new IGBT based AC drive inverter and its DC source converter, which were developed for industrial applications. AC drive inverter provides some benefits to customer, very large capacity for an induction motor, a compact footprint and a secured safety stop sequence which is compliant with ISO/IEC functional safety standard. And DC source converter to supply DC input power to AC drive system also provides some benefits as same as AC drive inverter. In addition, it is expected that new PWM control “Instantaneous Current Control PWM (IccPWM)” can improve performance to suppress a harmful harmonics against other surrounding devices and provide a simple harmonic filter to comply with IEEE-519 harmonic limits.
Word Recognition by Neural Networks Using Adaptive Mel-Cepstral Analysis
Hoya, Tetsuya,Ihara, Hitoshi,Asano, Takamitsu,Ishida, Yoshihisa 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
Neural networks have played an important role in many fields of signal processing. One of the fruitful application using neural networks is the development of speech recognition system. In this paper, a practical word recognition system using the technique of adaptive mel-cepstral analysis is presented. The experimental results show the proposed method is suitable for the practical word recognition system.
Design of Resonator-Coupled Wireless Power Transfer System by Use of BPF Theory
Ikuo Awai,Tetsuya Ishida 한국전자파학회JEES 2010 Journal of Electromagnetic Engineering and Science Vol.10 No.4
A wireless power transfer system based on magnetically coupled two resonators is analysed using the filter theory. Design equations for each lumped parameter circuit components are derived. As a result, change of coupling coefficient between the resonators and/or change of load resistance are easily responded. Effect of circuit loss to the design theory is also addressed. After designing a power transfer system, a real system is constructed using spiral and loop coils. Dependence of circuit elements on their dimensions is measured in advance and used to cope with the designed element values. Simulated response by use of designed element values and measured result are compared, indicating the validity of the theory.
Hwang, Chul-Min,Ishida, Masayoshi,Ito, Hiroshi,Maeda, Tetsuhiko,Nakano, Akihiro,Kato, Atsushi,Yoshida, Tetsuya The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.2
Polymer electrolyte-based unitized reversible fuel cells (URFCs) combine the functionality of a fuel cell and an electrolyzer in a single device. In this study, the influence of hydrophobic agent in the gas diffusion layer (GDL) of URFC was investigated. The titanium (Ti)-felt GDL which treated with different percent of PTFE emulsion was intensively tested with various humidification temperature conditions in the single cell of URFC. I-V performance curves and divided three overpotentials were compared and analyzed in the fuel cell mode. The electrolyzer performances were also evaluated with the I-V curves. Experimental results showed that the GDLs with high PTFE contents have better performance in the dry conditions. On the other hand, the increased PTFE contents accelerate flooding problem in the wet condition and it is related with rising concentration overpotential. The electrolyzer performances are almost same with different PTFE contents of GDL.
Raja Rizwan Hussain,Tetsuya Ishida 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.1
Corrosion is an electrochemical process which requires electrolyte for the occurrence of corrosion reaction. Therefore it is necessary to calculate the effective corrosion rate with reference to the saturated area of concrete only when it comes to corrosion of steel reinforcement embedded in concrete. Theoretically and numerically the saturated area depends on the capillary zone porosity,gel zone porosity and their respective degree of saturation in the aggregate free volume of concrete which is a heterogeneous material in nature. This makes it important to deeply understand the effect of aggregate on corrosion in concrete. Investigation was carried out to find the effect of coarse aggregate volume on the corrosion rate and potential of reinforcement steel in concrete. The initiative for this research came from the observation that the interfacial transition zone around the steel bar in concrete is surrounded primarily by paste only and hence the coarse aggregate volume should not influence the corrosion rate principally. Also there are chances that some fine aggregate could be present in the vicinity of steel bar surface being finer than coarse aggregate which may affect the corrosion rate. The previous research data in this field was found to be limited and has a difference of opinion. Therefore, these factors have been investigated in this research. Prismatic concrete and mortar specimens were cast and their corrosion potential values were compared with each other to find the effect of the volume of coarse aggregate on corrosion. The experiment results showed that the effect of the volume of coarse aggregate on corrosion potential is not significant since the area around the steel bar especially in the case of deformed steel is mostly surrounded by paste only. The corrosion potential values obtained in the case of mortar and concrete specimens showed same averaged magnitude. This fact was further strengthened by measuring the corrosion mass loss and resulting corrosion rate in the two cases. Furthermore, in the light of experiment results obtained in this research, the numerical FEM model DuCOM developed by our research group at the University of Tokyo, Japan incorporating the effect of aggregate on corrosion rate and potential of corroding steel in concrete undertaken in the past has been successfully enhanced and verified in this research.
Discovery of nitrate–CPK–NLP signalling in central nutrient–growth networks
Liu, Kun-hsiang,Niu, Yajie,Konishi, Mineko,Wu, Yue,Du, Hao,Sun Chung, Hoo,Li, Lei,Boudsocq, Marie,McCormack, Matthew,Maekawa, Shugo,Ishida, Tetsuya,Zhang, Chao,Shokat, Kevan,Yanagisawa, Shuichi,Sheen, Nature Publishing Group, a division of Macmillan P 2017 Nature Vol.545 No.7654
Nutrient signalling integrates and coordinates gene expression, metabolism and growth. However, its primary molecular mechanisms remain incompletely understood in plants and animals. Here we report unique Ca<SUP>2+</SUP> signalling triggered by nitrate with live imaging of an ultrasensitive biosensor in Arabidopsis leaves and roots. A nitrate-sensitized and targeted functional genomic screen identifies subgroup III Ca<SUP>2+</SUP>-sensor protein kinases (CPKs) as master regulators that orchestrate primary nitrate responses. A chemical switch with the engineered mutant CPK10(M141G) circumvents embryo lethality and enables conditional analyses of cpk10 cpk30 cpk32 triple mutants to define comprehensive nitrate-associated regulatory and developmental programs. Nitrate-coupled CPK signalling phosphorylates conserved NIN-LIKE PROTEIN (NLP) transcription factors to specify the reprogramming of gene sets for downstream transcription factors, transporters, nitrogen assimilation, carbon/nitrogen metabolism, redox, signalling, hormones and proliferation. Conditional cpk10 cpk30 cpk32 and nlp7 mutants similarly impair nitrate-stimulated system-wide shoot growth and root establishment. The nutrient-coupled Ca<SUP>2+</SUP> signalling network integrates transcriptome and cellular metabolism with shoot–root coordination and developmental plasticity in shaping organ biomass and architecture.