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S. Kurita,K. Imai,T.Yokoyama,S.Ohasi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In recent years, the switching frequency of power converter is increased due to the progress of the power devices. As the result, passive elements used in power converters can be reduced in the volume. The inductors using dust core material is applied to the PWM inverter to downsize the filter component. In the case of using the dust core inductors, the flux density is saturated for the large inductance current and the inductance parameter is rapidly varied widely due to the inductance current variations. The output characteristics is deteriorated in the case of the conventional control. Two kinds of the deadbeat control methods combined with the disturbance compensation and the inductance estimation with 1MHz multisampling method were proposed to adjust the control gains for the inductance parameter variations. In this paper, the effect of the two kinds methods were verified through simulations and experiments.
Species Relationships of Lycoris Endemic to Korea Evaluated by RAPD and SNPs of nrDNA-ITS Regions
유용권,Tao Yuan,이종석,이애경,Mark S. Roh,Siro Kurita,서정근 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.2
This study was performed to investigate the species relationships and variation of Lycoris Herb. (Amaryllidaceae) species using random amplification of polymorphic DNA (RAPD) markers. Also, single nucleotide polymorphisms (SNPs) of internal transcribed spacer 1, 5.8S ribosomal RNA gene and internal transcribed spacer 2 regions in Lycoris sanguinea var. koreana were analyzed. All accessions formed 6 major clusters; cluster A with all L. sanguinea and L. chejuensis; cluster B with 3 accessions of L. flavescens; cluster C with 8 accessions of F. flavescens var. flavescens; cluster D with 10 accessions of L. uydoensis; cluster E with L. chinensis var. sinuolata and 4 accessions of L. uydoensis; and cluster F with all L. radiata. Five haplotypes were observed; L. sanguinea and L. chejuensis having the haplotype 1 with bases of CTTATATATAT; L. chinensis var. sinuolata and all L. flavescens. Lycoris incarnata and L. aurea, non-endemic to Korea had haplotype 2 and 5, respectively. Genetic variations in L. flavescens, L. chinensis var. sinuolata, and L. uydoensis are revealed based on the analysis of molecular variances (AMOVA) and haploid types analyzed by sequence analysis. It is suggested that L. chejuensis may result from hybridization involving L. sanguinea var. koreana due to a close affinity between L. sanguinea complex and L. chejuensis. Nomenclature for L. chejuensis and L. flavescens whether they should be described as a hybrid origin should be discussed in the future.
Ni<sub>2</sub>X<sub>2</sub> (X=pnictide, chalcogenide, or B) based superconductors
Ronning, F.,Bauer, E.D.,Park, T.,Kurita, N.,Klimczuk, T.,Movshovich, R.,Sefat, A.S.,Mandrus, D.,Thompson, J.D. Elsevier 2009 Physica. C, Superconductivity Vol.469 No.9
<P>We review the properties of Ni-based superconductors which contain Ni2X2 (X = As, P, Bi, Si, Ge, B) planes, a common structural element found also in the recently discovered FeAs superconductors. Strong evidence for the fully gapped nature of the superconducting state has come from field dependent thermal conductivity results on BaNi2As2. Coupled with the lack of magnetism. the majority of evidence suggests that the Ni-based compounds are conventional elect ron-phonon mediated superconductors. However, the increase in T-c in LaNiAsO with doping is anomalous, and mimics the behavior in LaFeAsO. Furthermore, comparisons of the properties of Ni- and Fe-based systems show many similarities, particularly with regards to structure-property relationships. This suggests a deeper connection between the physics of the FeAs superconductors and the related Ni-based systems which deserves further investigation. (C) 2009 Elsevier B.V. All rights reserved.</P>