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Optimal Design Considerations of a Bus Converter for On-Board Distributed Power Systems
Abe, Seiya,Hirokawa, Masahiko,Shoyama, Masahito,Ninomiya, Tamotsu The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
The power supply systems, which require low-voltage / high-current output has been changing from the conventional centralized power system to a distributed power system. The distributed power system consists of a bus converter and POL. The most important factor is the system stability in bus architecture design. The overlap between the output impedance of a bus converter input impedance of POL causes system instability and has been an actual problem. By increasing the bus capacitor, the system stability can be easily improved. However, due to limited space on the system board, the increasing of bus capacitors is impractical. An urgent solution of this issue is strongly desired. This paper presents the output impedance design for on-board distributed power system by means of three control schemes of a bus converter. The output impedance peak of the bus converter and the input impedance of the POL are analyzed and then conformed experimentally for stability criterion. Furthermore, the design process of each control schemes for system stability is proposed.
Optimal Design of Bus Converter in On-Board Distributed Power Architecture
Seiya Abe,Masahiko Hirokawa,Tamotsu Ninomiya 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
The power supply system which requires the low-voltage / high-current output has been changing from conventional centralized power system to distributed power system. The distributed power system consists of bus converter and POL. The most important factor is the system stability in bus architecture design. The overlap between the output impedance of bus converter and input impedance of POL causes system instability, and it has been an actual problem. Increasing the bus capacitor, system stability can be reduced easily. However, due to the limited space on the system board, increasing of bus capacitors is impractical. The urgent solution of the issue is desired strongly. This paper presents the output impedance design for on-board distributed power system by means of three control schemes of bus converter. The output impedance peak of the bus converter and the input impedance of the POL are analyzed, and it is conformed by experimentally for stability criterion. Furthermore, the design process of each control schemes for system stability is proposed.
Optimal Design Considerations of a Bus Converter for On-Board Distributed Power Systems
Seiya Abe,Masahiko Hirokawa,Masahito Shoyama,Tamotsu Ninomiya 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
The power supply systems, which require low-voltage / high-current output has been changing from the conventional centralized power system to a distributed power system. The distributed power system consists of a bus converter and POL. The most important factor is the system stability in bus architecture design. The overlap between the output impedance of a bus converter input impedance of POL causes system instability and has been an actual problem. By increasing the bus capacitor, the system stability can be easily improved. However, due to limited space on the system board, the increasing of bus capacitors is impractical. An urgent solution of this issue is strongly desired. This paper presents the output impedance design for on-board distributed power system by means of three control schemes of a bus converter. The output impedance peak of the bus converter and the input impedance of the POL are analyzed and then conformed experimentally for stability criterion. Furthermore, the design process of each control schemes for system stability is proposed.
Horikoshi, Satoshi,Abe, Masahiko,Serpone, Nick Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.8
Novel light sources based on microwave discharge electrodeless lamps (MDEL) are examined as potential light sources to drive photochemical processes, in particular advanced oxidation processes (AOPs) of which various applications are described. The MDELs possess several features that make them attractive as possible environmental remediation lamps and as light sources to activate metal oxide photocatalysts in environmental remediation processes. Accordingly, the article describes some of the many features, albeit non-exhaustively, of MDEL devices and reports some photoreactors that incorporate these MDELs. Fundamental issues of MDEL light sources in remediation processing of actual pollutants are introduced. Examples are taken from the oxidative destruction of volatile organic compounds (VOCs; e.g. acetaldehyde and toluene), from the oxidative degradation of contaminants present in wastewaters (e.g. the 2,4-D herbicide and the endocrine disruptor bisphenol-A) and from the remediation of dioxin-contaminated fly-ash, along with an actual industrial wastewater sample from the manufacturing of cement.
Horikoshi, Satoshi,Tsuchida, Akihiro,Sakai, Hideki,Abe, Masahiko,Sato, Susumu,Serpone, Nick Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.11
A metallic condensing cone that concentrates microwave radiation (equivalent to an optical lens) has been developed and used as part of a system to activate a microwave discharge electrodeless lamp (MDEL) in the oxidative treatment of wastewaters by aiding the novel self-ignition of the lamp on irradiation at low microwave power levels. This approach to self-ignition can potentially lead to considerable energy savings in such treatments. System performance was examined for the ignition power of microwaves of such MDEL devices in water, whose usefulness was assessed by investigating the photolytic transformation of aqueous solutions of representatives of three classes of contaminants: chlorinated phenols, herbicides and endocrine disruptors, specifically 4-chlorophenol (4-CP), 2,4-dichlorophenoxyacetic acid (2,4-D) and 4,4'-isopropylidenediphenol (bisphenol-A; BPA), respectively, taken as model wastewaters in air-equilibrated, in oxygen-saturated and in $TiO_2$-containing aqueous media. The results are discussed in terms of the dynamics of the photo-induced degradation processes.
Tanabe, Koji,Kani, Shuichi,Shimizu, Takashi,Bae, Young-Ki,Abe, Takaya,Hibi, Masahiko The Society 2010 The Journal of neuroscience Vol.30 No.50
<P>Neurons have highly polarized structures that determine what parts of the soma elaborate the axon and dendrites. However, little is known about the mechanisms that establish neuronal polarity in vivo. Cerebellar Purkinje cells extend a single primary dendrite from the soma that ramifies into a highly branched dendritic arbor. We used the zebrafish cerebellum to investigate the mechanisms by which Purkinje cells acquire these characteristics. To examine dendritic morphogenesis in individual Purkinje cells, we marked the cell membrane using a Purkinje cell-specific promoter to drive membrane-targeted fluorescent proteins. We found that zebrafish Purkinje cells initially extend multiple neurites from the soma and subsequently retract all but one, which becomes the primary dendrite. In addition, the Golgi apparatus specifically locates to the root of the primary dendrite, and its localization is already established in immature Purkinje cells that have multiple neurites. Inhibiting secretory trafficking through the Golgi apparatus reduces dendritic growth, suggesting that the Golgi apparatus is involved in the dendritic morphogenesis. We also demonstrated that in a mutant of an atypical protein kinase C (aPKC), Prkci, Purkinje cells retain multiple primary dendrites and show disrupted localization of the Golgi apparatus. Furthermore, a mosaic inhibition of Prkci in Purkinje cells recapitulates the aPKC mutant phenotype. These results suggest that the aPKC cell autonomously controls the Golgi localization and thereby regulates the specification of the primary dendrite of Purkinje cells.</P>
( Myung Ja Kim ),( Seung Kwi Choi ),( Jin Hee Park ),( Masahiko Abe ) 한국공업화학회 1990 한국공업화학회 연구논문 초록집 Vol.1990 No.0
In this study, a series of microemulsions has been prepared as a function of salinity and aqueous NaCl fraction for sodium laurate/n-depane/1-pentanol/XN NaCl system, and the zeta potential measurements have been carried out using a new commercially developed Electrophoretic Laser Light Scattering instrument (Pen Ken 3000 Electrokinetics Analyzer) to evaluate the stability of multiphase microemulsions. The Helmholts-Smoluchowski equation in the, form u = ζ/η was adopted under the assumption that the bulk values of e and η apply within the double layer conducting aqueous medial. Our results showed that the microemulsion systems with higher ratio of aqueous fraction (Vo/Vw = 3/7) at low salinity exhibit the largest values of zeta potential around -50 mV; the electrokinetic potential measurement confirmed that the surface of microemulsion droplet beeches more hydropbilic as the aqueous fraction of the system increases and the salinity decreases. The zeta potentials of these microemulsions were used as a relative guide to the magnitude of electrostatic repulsion between the droplets of the system; an increase in the absolute values of zeta potential could be related to increase in the stability of the system.