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Variation analysis of free-style hand-written character pattern in documents
Yoshimasa Kimura,Kazumi Odaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We investigated variation analysis of individual character pattern written in free style and introduce ouranalysis strategy that combines five characteristics guessed to influence character variation and four types of analysis methods. The position of character, the order of writing the character, the writing time, writing pressure, etc. were selected as the five characteristics and the four analysis methods are constituted from an analysis of individualcharacteristics, relations between each characteristic, etc. Results of the analysis for collected characters show the writing time strongly influences the variation of character pattern.
Mukai, Eiichi,Kakinoki, Toshio,Yamaguchi, Hitoshi,Kimura, Yoshimasa,Fukai, Sumio Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.3
We examined the generation of harmonic voltage by a synchronous machine adding d-axis and q-axis harmonic field windings in order to reduce the harmonics in a power line. We derived the expressions of the armature voltage in the case of supplying the currents with the frequency nf to the d-axis and q-axis harmonic field windings. We constructed the synchronous machine adding the harmonic windings. In this paper, the expressions and the experimental results on the generation of harmonic voltages by the synchronous machine are presented.
Mukai, Eiichi,Fukai, Sumio,Kakinoki, Toshio,Yamaguchi, Hitoshi,Kimura, Yoshimasa Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.2
We investigated the harmonic voltages generated by a synchronous machine adding d-axis and q-axis harmonic field windings to reduce the harmonics in a power line. First, electronic circuits such as a frequency multiplier, band-pass filter, and phase shifter were newly designed and made to carry out the experiment. Next, an experimental circuit, for which an AC voltage of frequency 6f synchronized to the power line voltage of frequency f could be obtained, was constructed to examine the generation of harmonic voltage in more detail. Finally, an experiment involving the generation of harmonic voltage was performed using an experimental synchronous generator with harmonic windings in the d-axis and q-axis. In this paper, the power spectrum and the waveforms of the harmonic voltages in the armature winding are presented. Moreover, the values calculated from theoretical expressions of harmonic voltages in armature winding are compared with the values obtained by the experiment.